Light emitting display device

Abstract

A light emitting display device capable of improving light extraction efficiency of light emitted from a light emitting element is disclosed. The light emitting display device includes a cover coating layer on a substrate and including a plurality of protruding portions, a first electrode on the plurality of protruding portions, a light emitting layer on the first electrode, and a second electrode on the light emitting layer. The first electrode has a profile conforming to a profile of the plurality of protruding portions.

Description

[0001] This application is a divisional application of the patent application for Invention Patent Application No. 201910561663.3, filed on June 26, 2019, entitled "Light Emitting Display Apparatus".

[0002] Cross Reference to Related Applications

[0003] This application claims the benefit of and priority to Korean Patent Application No. 10-2018-0073482, filed on June 26, 2018, and Korean Patent Application No. 10-2018-0165519, filed on December 19, 2018, the entire contents of which are incorporated herein by reference as if fully set forth herein. TECHNICAL FIELD

[0004] The present disclosure relates to a light emitting display apparatus. BACKGROUND

[0005] Since a light emitting display apparatus has a high response speed and a low power consumption, and unlike a liquid crystal display apparatus, emits light spontaneously without using a specific light source, the light emitting display apparatus does not cause a viewing angle problem, and thus is attracting attention as a next-generation flat panel display apparatus.

[0006] A light emitting display apparatus displays an image through light emission from a light emitting element, each of which includes a light emitting layer interposed between two electrodes. In this case, light generated based on the light emission from the light emitting element is discharged outwardly via the electrodes, a substrate, etc.

[0007] However, in such a light emitting display apparatus, some of the light emitted from the light emitting layer is not discharged outwardly due to total reflection at an interface between the light emitting layer and the electrodes and / or an interface between the substrate and an air layer, etc., and thus the light extraction efficiency is reduced. Therefore, the light emitting display apparatus has a problem in that the luminance is reduced and the power consumption is increased due to the low light extraction efficiency. SUMMARY

[0008] In various embodiments, the present disclosure provides a light emitting display apparatus which can improve the light extraction efficiency of light emitted from a light emitting element.

[0009] In one or more embodiments, the present disclosure provides a light emitting display apparatus including a cover coating layer located on a substrate and including a plurality of protruding portions, a first electrode located on the plurality of protruding portions, a light emitting layer located on the first electrode, and a second electrode located on the light emitting layer, wherein the first electrode has a profile conforming to a profile of the plurality of protruding portions, and the light emitting layer has a profile not conforming to the profile of the plurality of protruding portions.

[0010] According to another embodiment of the disclosure, there is provided a light emitting display device including a cover coating layer located on a substrate and including an uneven portion having a plurality of protruding portions, a first electrode located on the uneven portion, a light emitting layer located on the first electrode, and a second electrode located on the light emitting layer, wherein the uneven portion has a surface area increase rate in a range of 1.05 to 2.0 inclusive with respect to a unit area.

[0011] According to another embodiment of the disclosure, there is provided a light emitting display device including a substrate including a plurality of pixels having an open area, a cover coating layer located on the substrate and including an uneven portion having a pointed top portion within the open area, a first electrode located on the uneven portion, a light emitting layer located on the first electrode, and a second electrode located on the light emitting layer, wherein the first electrode is formed in a conformal shape with respect to the uneven portion, and the light emitting layer is formed in a non-conformal shape with respect to the first electrode.

[0012] According to another embodiment of the disclosure, there is provided a light emitting display device including a substrate including a plurality of pixels having an open area, a cover coating layer located on the substrate and including an uneven portion having a pointed top portion within the open area, a first electrode located on the uneven portion, a light emitting layer located on the first electrode, and a second electrode located on the light emitting layer, wherein the first electrode is formed in a conformal shape with respect to the uneven portion, and the light emitting layer is formed in a non-conformal shape with respect to the first electrode.

[0013] With the light emitting display device according to various embodiments of the disclosure, light extraction efficiency of light emitted from a light emitting element can be improved, luminance can be improved, and power consumption can be reduced.

[0014] In addition to the above advantageous effects of the disclosure, other features and advantages of the disclosure will be described from these descriptions or explanations, or can be clearly understood by those skilled in the art from these descriptions or explanations. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate embodiments of the disclosure and together with the description serve to explain the principles of the disclosure. In the drawings:

[0016] Figure 1 is a diagram schematically showing a light emitting display device according to the disclosure;

[0017] Figure 2 is a diagram schematically showing a light emitting display device according to the disclosure; Figure 1a circuit diagram of the first pixel shown in FIG. 1;

[0018] Figure 3 is a cross-sectional view showing a pixel according to an example of the present disclosure;

[0019] Figure 4 is Figure 3 is an enlarged view of the portion A shown in FIG. 2;

[0020] Figure 5 is a plan view showing Figure 3 is a plan view of a planar structure of the uneven portion shown in FIG. 3;

[0021] Figure 6 is a cross-sectional view taken along line I-I' in FIG. 4; Figure 5

[0022] Figure 7 is an enlarged view of a microscope image of the protruding portion shown in FIG. 5; Figure 6

[0023] Figure 8 is a graph showing Figure 6

[0024] Figure 9 is a microscope image showing an uneven portion provided in a pixel in a light emitting display device according to an example of the present disclosure;

[0025] Figure 10 is a graph showing Figure 9

[0026] Figure 11A is a graph showing enhancement of current efficiency of a white pixel corresponding to an aspect ratio of a protruding portion in a light emitting display device according to the present disclosure;

[0027] Figure 11B is a graph showing enhancement of current efficiency of a red pixel, a green pixel, and a blue pixel corresponding to an aspect ratio of a protruding portion in a light emitting display device according to the present disclosure;

[0028] Figure 12A is a graph showing enhancement of current efficiency of a white pixel corresponding to a half-height aspect ratio of a protruding portion in a light emitting display device according to the present disclosure;

[0029] Figure 12B is a graph showing enhancement of current efficiency of a red pixel, a green pixel, and a blue pixel corresponding to a half-height aspect ratio of a protruding portion in a light emitting display device according to the present disclosure;

[0030] Figure 13A ​​​​is a graph showing current efficiency enhancement of a white pixel corresponding to a 4 / 5 height aspect ratio of a protruding portion in a light emitting display device according to the present disclosure;

[0031] Figure 13B is a graph showing current efficiency enhancement of a red pixel, a green pixel, and a blue pixel corresponding to a 4 / 5 height aspect ratio of a protruding portion in a light emitting display device according to the present disclosure;

[0032] Figure 14 is a graph showing a linear relationship between a surface area of an uneven portion and an aspect ratio of a protruding portion in a light emitting display device according to the present disclosure;

[0033] Figure 15 is a graph showing a linear relationship between a surface area of an uneven portion and a 4 / 5 height aspect ratio of a protruding portion in a light emitting display device according to the present disclosure;

[0034] Figure 16A is a graph showing light extraction efficiency corresponding to an aspect ratio of a protruding portion in a light emitting display device according to the present disclosure;

[0035] Figure 16B is a graph showing light extraction efficiency corresponding to a surface area increase rate of an uneven portion in a light emitting display device according to the present disclosure;

[0036] Figure 16C is a graph showing current efficiency enhancement corresponding to a surface area increase rate of an uneven portion in a light emitting display device according to the present disclosure;

[0037] Figure 17A is a graph showing a distribution of light extraction efficiency corresponding to an aspect ratio of a protruding portion and a sharpness of a protruding portion in a light emitting display device according to the present disclosure;

[0038] Figure 17B is a graph showing a distribution of light extraction efficiency corresponding to a surface area increase rate of an uneven portion and a 4 / 5 height aspect ratio of a protruding portion in a light emitting display device according to the present disclosure;

[0039] Figure 18 is a graph showing a light path corresponding to a shape of a protruding portion and a light emitting layer of an example according to the present disclosure; and

[0040] Figure 19 is a photograph showing an actual emission image of a pixel in a light emitting display device according to an example of the present disclosure. DETAILED DESCRIPTION

[0041] Reference will now be made in detail embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

[0042] Advantages and features of the present disclosure and methods of accomplishing the same can be understood from the following embodiments described in detail with reference to the accompanying drawings. The present disclosure may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0043] The shapes, sizes, ratios, angles and numbers disclosed in the accompanying drawings for describing the embodiments of the present disclosure are merely examples and thus the present disclosure is not limited to the illustrated details. Like reference numerals refer to like elements throughout the description. In the following description, detailed descriptions of functions or configurations that are determined to be unnecessarily obscure the gist of the present disclosure will be omitted.

[0044] In the case of using "include", "have", and "comprise" in the present specification, another component (part) can be added unless "only" is used. The singular form can include the plural form unless specifically restricted to the opposite.

[0045] In interpreting the components, the components should be interpreted to include the error range, although not explicitly described.

[0046] In describing the positional relationship between elements, for example, when the positional relationship between two components (parts) is described as "on", "above", "below", and "adjacent to", one or more other components (parts) can be disposed between the two components (parts), unless "just" or "directly" is used.

[0047] In describing the temporal relationship, for example, when the temporal order is described as "after", "subsequent to", "following", and "before", discontinuous cases can be included, unless "just" or "directly" is used.

[0048] It should be understood that although the terms "first", "second", and the like can be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element without departing from the scope of the present disclosure.

[0049] The term "at least one" is to be construed to cover "one or more" of any and all cited items. For example, "at least one of a first item, a second item, and a third item" means any of the following combinations: a combination of two or more of the first item, the second item, and the third item, and the first item, the second item, or the third item.

[0050] Features of various embodiments of the present disclosure can be partially or wholly coupled with or combined with each other and can be variously inter-operable and technically driven with each other as can be sufficiently understood by those skilled in the art. Embodiments of the present disclosure can be executed independently of each other or can be executed together in an interdependent manner.

[0051] Hereinafter, embodiments of a light emitting display apparatus according to the present disclosure will be described in detail with reference to the accompanying drawings. In adding reference numerals to elements in each drawing, although the same elements are shown in other drawings, the same reference numerals can refer to the same elements. Also, the ratio of each element shown in the drawings is different from the actual ratio for convenience of description, and thus is not limited to the ratio shown in the drawings.

[0052] Figure 1 FIG. 1 is a diagram schematically showing a light emitting display apparatus according to one or more embodiments of the present disclosure.

[0053] Referring to Figure 1 The light emitting display apparatus according to an embodiment of the present disclosure includes a pixel array unit 10, a control circuit 30, a data driving circuit 50, and a gate driving circuit 70.

[0054] The pixel array unit 10 includes a plurality of gate lines GL and a plurality of data lines DL disposed on a substrate, and a plurality of pixels 12a, 12b, 12c, and 12d formed in a pixel region defined by the plurality of gate lines GL and the plurality of data lines DL.

[0055] Each of the plurality of pixels 12a, 12b, 12c, and 12d displays an image according to a gate signal provided from an adjacent gate line GL and a data signal provided from an adjacent data line DL.

[0056] For example, each of the plurality of pixels 12a, 12b, 12c, and 12d includes a pixel circuit disposed in a corresponding pixel region and a light emitting element connected to the pixel circuit.

[0057] The pixel circuit includes at least two thin film transistors and at least one capacitor.

[0058] The light emitting element includes a self-emitting element that emits light in response to a data signal provided from the pixel circuit and displays an image. Examples of the self-emitting element include an organic light emitting element, a quantum dot light emitting element, and an inorganic light emitting element.

[0059] Each of the plurality of pixels 12a, 12b, 12c, and 12d can be defined by a region of a minimum unit that actually emits light, and can be referred to as a sub-pixel. In some embodiments, at least three pixels adjacent to each other can constitute a unit pixel 12 for displaying a color image.

[0060] One unit pixel 12 according to an embodiment can include three pixels 12a, 12b, and 12c arranged adjacent to each other in a longitudinal direction of a corresponding gate line GL, or four pixels 12a, 12b, 12c, and 12d arranged adjacent to each other in the longitudinal direction of the corresponding gate line GL. For example, the first pixel 12a can be a red pixel, the second pixel 12b can be a green pixel, the third pixel 12c can be a blue pixel, and the fourth pixel 12d can be a white pixel. The light emitting elements of the first to third pixels 12a, 12b, and 12c can emit light of different colors or can emit white light. When the light emitting elements of the first to third pixels 12a, 12b, and 12c emit white light, the first to third pixels 12a, 12b, and 12c include different wavelength conversion layers (or color filter layers) that convert white light into light of different colors. The light emitting element of the fourth pixel 12d can emit white light. In some embodiments, the fourth pixel 12d can not include a wavelength conversion layer (or a color filter layer), or can include the same wavelength conversion layer (or color filter layer) as one of the first to third pixels 12a, 12b, and 12C.

[0061] One unit pixel 12 according to another embodiment can include first to fourth pixels 12a, 12b, 12c, and 12d arranged adjacent to each other in a longitudinal direction of a corresponding data line DL. In such a unit pixel 12, the number of gate lines GL connected to the gate driving circuit 70 having a relatively simple circuit configuration increases, but the number of data lines DL connected to the data driving circuit 50 having a relatively complex circuit configuration decreases.

[0062] The control circuit 30 generates pixel data corresponding to the plurality of pixels 12a, 12b, 12c, and 12d based on the image signal. The control circuit 30 according to an embodiment of the disclosure can extract white pixel data, i.e., red input data, green input data, and blue input data of the unit pixel 12 based on the image signal, calculate red pixel data, green pixel data, and blue pixel data by reflecting offset data based on the white pixel data extracted in the red input data, the green input data, and the blue input data, arrange the calculated red pixel data, green pixel data, blue pixel data, and white pixel data to correspond to a pixel array structure, and provide the arranged data to the data driving circuit 50.

[0063] The control circuit 30 generates a data control signal based on the timing synchronization signal and supplies the generated data control signal to the data drive circuit 50. The control circuit 30 generates a gate control signal based on the timing synchronization signal and supplies the generated gate control signal to the gate drive circuit 70.

[0064] The data drive circuit 50 is connected to a plurality of data lines DL provided in the pixel array unit 10. The data drive circuit 50 receives pixel data and a data control signal supplied from the control circuit 30, and receives a plurality of reference gamma voltages supplied from a power supply circuit. The data drive circuit 50 converts the pixel data into a pixel data signal using the data control signal and the plurality of reference gamma voltages, and supplies the converted pixel data signal to a corresponding data line DL.

[0065] The gate drive circuit 70 is connected to a plurality of gate lines GL provided in the pixel array unit 10. The gate drive circuit 70 generates a gate signal in a predetermined order based on a gate control signal supplied from the control circuit 30, and supplies the generated gate signal to a corresponding gate line GL.

[0066] The gate drive circuit 70 according to an embodiment can be integrated on one edge or both edges of the substrate by a process of manufacturing thin film transistors, and can be connected to a plurality of gate lines GL in a one-to-one corresponding manner. The gate drive circuit 70 according to another embodiment can be configured as an integrated circuit and mounted on the substrate, or can be mounted on a soft circuit film and connected to a plurality of gate lines GL in a one-to-one corresponding manner.

[0067] Figure 2 is an equivalent circuit diagram of the first pixel shown in Figure 1

[0068] Referring to Figure 2 The first pixel 12a of the light emitting display apparatus according to an embodiment includes a pixel circuit PC and a light emitting element ED.

[0069] The pixel circuit PC is provided in a circuit region in a pixel region defined by a corresponding gate line GL and a corresponding data line DL, and is connected to the corresponding gate line GL, the corresponding data line DL, and a first driving power source VDD. The pixel circuit PC controls emission of light from the light emitting element ED according to a data signal Vdata from the data line DL in response to a gate-on signal GS from the gate line GL. For example, the pixel circuit PC according to an embodiment can include a switching thin film transistor ST, a driving thin film transistor DT, and a capacitor Cst.

[0070] ​The switching thin-film transistor ST can include a gate electrode connected to a corresponding gate line GL, a first source / drain electrode connected to a corresponding data line DL, and a second source / drain electrode connected to the gate electrode of the driving thin-film transistor DT. The switching thin-film transistor ST is turned on according to a gate-on signal GS provided to the gate line GL, and provides a data signal Vdata provided to the data line DL to the gate electrode of the driving thin-film transistor DT.

[0071] The driving thin-film transistor DT can include a gate electrode connected to the second source / drain electrode of the switching thin-film transistor ST, a drain electrode connected to a first driving power source VDD, and a source electrode connected to the light emitting element ED. The driving thin-film transistor DT is turned on according to the data signal Vdata provided from the switching thin-film transistor ST, and controls a current (or data current) provided from the first driving power source VDD to the light emitting element ED.

[0072] The capacitor Cst is connected between the gate electrode and the source electrode of the driving thin-film transistor DT, stores a voltage corresponding to the data signal Vdata provided to the gate electrode of the driving thin-film transistor DT, and turns on the driving thin-film transistor DT using the stored voltage. The capacitor Cst can maintain the on state of the driving thin-film transistor DT until a new data signal Vdata is provided via the switching thin-film transistor ST in the next frame.

[0073] The light emitting element ED is disposed in an emission region in the pixel region, and emits light according to a current provided from the pixel circuit PC.

[0074] For example, the light emitting element ED can include a first electrode connected to the source electrode of the driving thin-film transistor DT, a second electrode connected to a second driving power source VSS, and a light emitting layer disposed between the first electrode and the second electrode. The light emitting layer can include one of an organic light emitting layer, an inorganic light emitting layer, and a quantum dot light emitting layer, or it can include a stacked or mixed structure formed of an organic light emitting layer (or an inorganic light emitting layer) and a quantum dot light emitting layer.

[0075] The first pixel 12a of the light emitting display apparatus according to an embodiment displays a predetermined image by causing the light emitting element ED to emit light according to a current corresponding to the data signal Vdata.

[0076] Similarly, the second to fourth pixels 12b, 12c, and 12d have substantially the same configuration as the first pixel 12a, and thus a repetitive description thereof is omitted.

[0077] Figure 3 FIG. 1 is a cross-sectional view illustrating a pixel according to an embodiment of the disclosure. Figure 4 FIG. 2 is a cross-sectional view illustrating a pixel according to an embodiment of the disclosure. Figure 3 FIG. 3 is an enlarged view of a portion A illustrated in FIG. 2. Figure 5 FIG. 4 is a cross-sectional view illustrating a pixel according to an embodiment of the disclosure. Figure 3a plan view of a planar structure of uneven portions shown in FIG. 1.

[0078] Referring to Figures 3 to 5 A pixel according to an embodiment of the disclosure includes a substrate 100 and a pixel area PA disposed on the substrate 100.

[0079] The substrate 100 can be formed of a glass material, but in various embodiments the substrate 100 can be formed of a transparent plastic material such as polyimide, which can be bent or curved. When a plastic material is used as the material of the substrate 100, a high-temperature deposition process is performed on the substrate 100, and thus polyimide having excellent heat resistance capable of withstanding high temperatures can be used. The entire front surface of the substrate 100 can be covered (or overlapped) with one or more buffer layers 110.

[0080] The buffer layer 110 serves to prevent the material included in the substrate 100 from diffusing into the transistor layer in a high-temperature process of the process of manufacturing the thin film transistor. The buffer layer 110 can also serve to prevent external water or moisture from intruding into the light emitting element. The buffer layer 110 can be formed of silicon oxide or silicon nitride. The buffer layer 110 can be omitted in some embodiments.

[0081] The pixel area PA includes a circuit area CA and an opening area OA.

[0082] The circuit area CA includes a transistor layer, a protective layer 130, and a cover coating layer 170.

[0083] The transistor layer can include a driving thin film transistor DT.

[0084] For example, the driving thin film transistor DT includes an active layer 111, a gate insulating film 113, a gate electrode 115, an interlayer insulating film 117, a drain electrode 119d, and a source electrode 119s.

[0085] The active layer 111 includes a channel region 111c, a drain region 111d, and a source region 111s, which are formed in a driving thin film transistor area of the circuit area CA defined on the buffer layer 110. For example, the active layer 111 includes the drain region 111d and the source region 111s, which can be solidified by etching gas when the gate insulating film 113 is etched, and the channel region 111c, which is not solidified by the etching gas. The drain region 111d and the source region 111s can be separated apart from each other in parallel to each other, with the channel region 111c interposed therebetween.

[0086] The active layer 111 according to the embodiment can be formed of a semiconductor material including one of amorphous silicon, polysilicon, an oxide, and an organic material, but the embodiment is not limited thereto. For example, the active layer 111 according to the present disclosure can be formed of an oxide such as zinc oxide, tin oxide, Ga-In-Zn oxide, In-Zn oxide, or In-Sn oxide, or can be formed of an oxide doped with ions of Al, Ni, Cu, Ta, Mo, Zr, V, Hf, or Ti.

[0087] The gate insulating film 113 is formed on the channel region 111c of the active layer 111. The gate insulating film 113 is not formed on the entire front surface of the substrate 100 including the active layer 111 or the buffer layer 110, but can be formed in an island form only on the channel region 111c of the active layer 111.

[0088] The gate electrode 115 is formed on the gate insulating film 113 to overlap the channel region 111c of the active layer 111. The gate electrode 115 can be used as a mask for preventing the channel region 111c of the active layer 111 from being solidified by etching gas when the gate insulating film 113 is patterned using an etching process. The gate electrode 115 can be formed of molybdenum Mo, aluminum Al, chromium Cr, gold Au, titanium Ti, nickel Ni, neodymium Nd, copper Cu, or an alloy thereof, and can be formed as a single layer metal or alloy or a multilayer including two or more layers.

[0089] The interlayer insulating film 117 is formed on the gate electrode 115 and the drain region 111d and the source region 111s of the active layer 111. For example, the interlayer insulating film 117 can be formed on the entire front surface of the substrate 100 or the buffer layer 110 to cover (or overlap) the gate electrode 115 and the drain region 111d and the source region 111s of the active layer 111. The interlayer insulating film 117 can be formed of an inorganic material such as silicon oxide SiOx or silicon nitride SiNx, or can be formed of an organic material such as benzocyclobutene or photoleum acrylic acid.

[0090] The drain electrode 119d is electrically connected to the drain region 111d of the active layer 111 via a first contact hole formed in the interlayer insulating film 117 to overlap the drain region 111d of the active layer 111.

[0091] The source electrode 119s is electrically connected to the source region 111s of the active layer 111 via a second contact hole formed in the interlayer insulating film 117 to overlap the source region 111s of the active layer 111.

[0092] The drain electrode 119d and the source electrode 119s can be formed of the same metal material, for example, molybdenum Mo, aluminum Al, chromium Cr, gold Au, titanium Ti, nickel Ni, neodymium Nd, copper Cu, or an alloy thereof, and can be formed as a single layer metal or alloy or a multilayer including two or more layers.

[0093] Further, the circuit region CA also includes a switching thin film transistor and a capacitor.

[0094] The switching thin film transistor is provided on the circuit region CA and has substantially the same structure as the driving thin film transistor, and thus its description will not be repeated.

[0095] The capacitor is provided in an overlapping region of the gate electrode 115 and the source electrode 119s of the driving thin film transistor DT, with the interlayer insulating film 117 interposed therebetween.

[0096] In addition, the transistor provided in the circuit region CA can have a characteristic that its threshold voltage is shifted by light. To prevent such a phenomenon, the light-emitting display device according to the present disclosure can further include a light-blocking layer 101 provided below the active layer 111.

[0097] The light-blocking layer 101 is provided between the substrate 100 and the active layer 111 and functions to minimize or prevent a threshold voltage variation of the transistor due to external light by blocking light incident on the active layer 111 via the substrate 100. The light-blocking layer 101 can be covered with the buffer layer 110. In some embodiments, the light-blocking layer 101 can be electrically connected to the source electrode of the transistor or can be electrically connected to a separate bias power source and can also function as a lower gate electrode of the corresponding transistor. In some embodiments, the light-blocking layer 101 minimizes or prevents a characteristic variation due to light or a threshold voltage variation of the transistor due to a bias voltage.

[0098] The protective layer 130 is provided on the substrate 100 to cover (or overlap) the transistor layer. For example, the protective layer 130 can cover (or overlap) the drain electrode 119d and the source electrode 119s of the driving thin film transistor DT and the interlayer insulating film 117. The protective layer 130 can be formed of an inorganic material such as silicon oxide SiOx or silicon nitride SiNx, for example. The protective layer 130 can be referred to as a passivation layer.

[0099] The cover coating layer 170 is provided on the substrate 100 to cover (or overlap) the protective layer 130. The cover coating layer 170 is formed in a relatively large thickness and functions to provide a flat surface on the substrate 100. The cover coating layer 170 can be formed of an organic material such as photoacrylic acid, benzocyclobutene, polyimide, or fluororesin, for example.

[0100] The opening region OA can be defined as a light extraction region from which light generated in each pixel is extracted (or discharged) to the outside. For example, the opening region OA includes the uneven portion 180 and the light-emitting element ED.

[0101] The uneven portion 180 (or non-planar portion) is provided in the cover coating layer 170 overlapping the opening area OA to have a wavy (or uneven) shape and change a propagation path of light emitted from the light emitting element ED, improving light extraction efficiency.

[0102] The uneven portion 180 according to an embodiment can include a plurality of protruding portions 181. Each of the plurality of protruding portions 181 can be referred to as a microlens.

[0103] Each of the plurality of protruding portions 181 can be provided in the cover coating layer 170 overlapping the opening area OA to have a shape capable of increasing or maximizing external extraction efficiency of light generated in the pixel based on an effective emission area of the light emitting element ED. Each of the plurality of protruding portions 181 changes a propagation path of light emitted from the light emitting element ED toward the substrate 100, thereby increasing external extraction efficiency of light emitted from the light emitting element ED.

[0104] Each of the plurality of protruding portions 181 according to an embodiment can have a cross-sectional shape including a top portion 181a having a sharp or pointed shape. For example, each of the plurality of protruding portions 181 includes a first curved portion 181b having a concave shape, which is disposed between a bottom portion 181c and the top portion 181a, and each of the plurality of protruding portions 181 can have a triangular cross-section with the first curved portion 181b as a hypotenuse.

[0105] The top portion 181a of each of the plurality of protruding portions 181 can be referred to as a first pointed top portion having a sharp tip. Accordingly, the uneven portion 180 includes the pointed top portion, and the pointed top portion can have a hexagonal shape in a plan view (or in two dimensions). For example, the uneven portion 180 can have a honeycomb structure in two dimensions.

[0106] The plurality of protruding portions 181 can be connected to each other in all directions. That is, the bottom portion (or bottom surface) 181c of each of the plurality of protruding portions 181 can be connected to the bottom portion 181c of the protruding portion 181 adjacent thereto in all directions. Accordingly, the cover coating layer 170 (or the uneven portion 180) overlapping the opening area OA can include a plurality of concave portions 183 arranged between the plurality of protruding portions 181. One concave portion 183 is surrounded by the plurality of protruding portions 181 adjacent thereto. The plurality of protruding portions 181 surrounding one concave portion 183 can be arranged in a hexagonal shape (or a honeycomb structure). The plurality of protruding portions 181 and the plurality of concave portions 183 can be referred to as the uneven portion 180 or a microlens array including the top portion 181a.

[0107] Each of the plurality of recessed portions 183 is disposed to be recessed from a front surface 170a (or surface) of the cover coating layer 170. In some embodiments, the plurality of recessed portions 183 are at the same depth from the front surface 170a of the cover coating layer 170, but can have different depths within a manufacturing error (or manufacturing tolerance) range. For example, in some embodiments, the manufacturing error range between the depths of the recessed portions 183 can be less than about 10%, and in some embodiments, the manufacturing error range can be less than about 5%. The plurality of recessed portions 183 are arranged at a substantially constant interval in the first direction X and in a zigzag shape in the second direction Y. For example, the plurality of recessed portions 183 can be arranged in a lattice shape at a constant interval, such that adjacent recessed portions 183 are arranged in a zigzag shape in the second direction Y. Accordingly, the centers of three adjacent recessed portions 183 form a triangle TS. Each of the plurality of recessed portions 183 is surrounded by six recessed portions 183 adjacent thereto. The centers of the six recessed portions 183 surrounding one recessed portion 183 form a hexagonal shape in a plan view.

[0108] The plurality of protruding portions 181 are defined as boundary portions between the recessed portions 183. Accordingly, each of the plurality of recessed portions 183 includes a first curved portion 181b surrounded by the boundary portion and disposed to be recessed from the boundary portion.

[0109] The uneven portion 180 including the plurality of protruding portions 181 and the plurality of recessed portions 183 is formed by forming a mask pattern on the opening area OA of the cover coating layer 170 using a photolithography process of a photoresist, and then performing an etching process on the cover coating layer 170 using the mask pattern. In some embodiments, the photoresist can be a positive photoresist to improve productivity.

[0110] The interval (or pitch) P between the top portions 181a of the protruding portions 181 according to the embodiment can be equal to the diameter of the bottom portion 181c of each protruding portion 181, or can be less than the diameter of the bottom portion 181c of each protruding portion 181. In this case, when the interval P between the top portions 181a of the protruding portions 181 is greater than the diameter of the bottom portion 181c of each protruding portion 181, the density of the protruding portions 181 disposed in the opening area OA of the pixel area PA decreases, and thus the external extraction efficiency of light emitted from the light emitting element ED can decrease.

[0111] The light emitting element ED emits light to the substrate 100 according to a bottom emission system. The light emitting element ED according to the embodiment includes a first electrode E1, a light emitting layer EL, and a second electrode E2.

[0112] The first electrode E1 is formed on the overcoat layer 170 in the pixel area PA and is electrically connected to the source electrode 119s of the drive thin-film transistor DT. In some embodiments, an end of the first electrode E1 adjacent to the circuit area CA extends over the source electrode 119s of the drive thin-film transistor DT and is electrically connected to the source electrode 119s of the drive thin-film transistor DT via a contact hole CH provided in the overcoat layer 170 and the protective layer 130. The first electrode E1 is in direct contact with the uneven portion 180, and thus has a shape (or a surface shape) that conforms to the shape of the uneven portion 180. For example, since the first electrode E1 is formed (or deposited) on the overcoat layer 170 with a relatively small thickness, the first electrode E1 has a profile (or a second profile) that conforms to the profile (or a first profile) of the uneven portion 180. Thus, since the first electrode E1 is formed into a conformal shape that conforms to the profile (or the shape) of the uneven portion 180 by a process of depositing a transparent conductive material, the first electrode E1 has the same cross-sectional structure as the uneven portion 180.

[0113] The first electrode E1 functions as an anode electrode of the light-emitting element ED. For example, the first electrode E1 is formed of a transparent conductive material such as a transparent conductive oxide (TCO), so that light emitted from the light-emitting layer EL is transmitted to the substrate 100. For example, the first electrode E1 can be formed of indium tin oxide (ITO) or indium zinc oxide (IZO).

[0114] The light-emitting layer EL is formed on the first electrode E1 and is in direct contact with the first electrode E1. In some embodiments, the light-emitting layer EL is formed (or deposited) with a greater thickness than the first electrode E1, and thus has a profile (a third profile) that does not conform to the profile of the plurality of protruding portions 181 or the profile of the first electrode E1. For example, the light-emitting layer EL has a shape that conforms to the first curved portion 181b of the plurality of protruding portions 181 or the profile of the first electrode E1, and a top portion of the light-emitting layer EL overlaps with the top portion 181a of each of the protruding portions 181 and has a blunt curved shape or a rounded shape that is different from the top portion 181a of the protruding portions 181. Thus, by a deposition process, the light-emitting layer EL is formed into a non-conformal shape that does not conform to the profile (or the shape) of the first electrode E1 and thus has a cross-sectional structure that is different from that of the first electrode E1 (or the plurality of protruding portions).

[0115] The light-emitting layer EL according to an embodiment is formed to have an increased thickness toward the bottom portion 181c of the protruding portion 181 or the recessed portion 183 of the uneven portion 180. For example, the light-emitting layer EL has a first thickness T1 in an upper region including the top portion 181a of the protruding portion 181, and has a second thickness T2 in the bottom portion 181c of the protruding portion 181, the second thickness T2 being greater than the first thickness T1. Thus, depending on its thickness, the light-emitting layer EL includes an effective emission area EA and a non-effective emission area NEA. The effective emission area EA of the light-emitting layer EL is set to the upper region of the protruding portion 181, and the non-effective emission area NEA of the light-emitting layer EL is set to the lower region of the protruding portion 181. For example, the thickness of the light-emitting layer EL can gradually decrease from a maximum thickness at or near the center of the recessed portion 183 to a minimum thickness at or near the top portion 181a of the protruding portion 181. The effective emission area EA can correspond to a section near the upper region of the protruding portion (e.g., around the top portion 181a) where the thickness of the light-emitting layer EL is suitable for effective emission of light. The non-effective emission area NEA can correspond to a section near the lower region (e.g., near the center of the recessed portion 183) where the thickness of the light-emitting layer EL is not suitable (e.g., too thick) for effective emission of light. It should be appreciated that the specific location of the boundary between the effective emission area EA and the non-effective emission area NEA can vary in various embodiments.

[0116] The light-emitting layer EL according to another embodiment can include two or more light-emitting portions for emitting white light. For example, the light-emitting layer EL includes a first light-emitting portion and a second light-emitting portion for emitting white light by mixing first light and second light. In some embodiments, the first light-emitting portion emits first light and includes one of a blue light-emitting portion, a green light-emitting portion, a red light-emitting portion, a yellow light-emitting portion, and a yellow-green light-emitting portion. The second light-emitting portion includes a light-emitting portion that emits light having a complementary color relationship to the first light out of the blue light-emitting portion, the green light-emitting portion, the red light-emitting portion, the yellow light-emitting portion, and the yellow-green light-emitting portion.

[0117] The light-emitting layer EL according to another embodiment can include one of a blue light-emitting portion, a green light-emitting portion, and a red light-emitting portion. For example, when the pixel is a red pixel, the light-emitting layer of the red pixel includes a red light-emitting portion. When the pixel is a green pixel, the light-emitting layer of the green pixel includes a green light-emitting portion. When the pixel is a blue pixel, the light-emitting layer of the blue pixel includes a blue light-emitting portion.

[0118] The second electrode E2 is formed on the light-emitting layer EL and directly contacts the light-emitting layer EL. In some embodiments, the second electrode E2 is formed (or deposited) on the light-emitting layer EL to have a smaller thickness than the light-emitting layer EL. In some embodiments, the second electrode E2 is formed (or deposited) on the light-emitting layer EL with a relatively small thickness, and thus has a profile conforming to that of the light-emitting layer EL. Accordingly, the second electrode E2 can have the same overall cross-sectional structure as the light-emitting layer EL. For example, the cross-sectional profile or shape of the second electrode E2 can be substantially similar to that of the light-emitting layer EL (e.g., a curved or rounded tip having an overlapping top portion 181a)

[0119] The second electrode E2 can serve as a cathode electrode of the light-emitting element ED. The second electrode E2 according to an embodiment includes a metal material having high reflectivity to reflect light emitted from the light-emitting layer EL and incident thereon to the substrate 100. For example, the second electrode E2 can be formed as a multilayer structure, such as a stacked structure of aluminum Al and titanium Ti (Ti / Al / Ti), a stacked structure of aluminum Al and ITO (ITO / Al / ITO), an APC (Ag / Pd / Cu) alloy, a stacked structure of an APC (Ag / Pd / Cu) alloy and ITO (ITO / APC / TIO), or can have a single layer structure including one material selected from silver Ag, aluminum Al, molybdenum Mo, gold Au, magnesium Mg, calcium Ca, and barium Ba, or two or more alloy materials.

[0120] The opening area OA according to the present disclosure can further include a wavelength conversion layer 150.

[0121] The wavelength conversion layer 150 is provided between the substrate 100 and the cover coating layer 170 to overlap the opening area OA.

[0122] The wavelength conversion layer 150 according to an embodiment is provided on the protective layer 130 to overlap the opening area OA. That is, the wavelength conversion layer 150 is supported by the protective layer 130 and covered by the cover coating layer 170, whereby the wavelength conversion layer 150 is provided between the protective layer 130 and the uneven portion 180 to overlap the opening area OA.

[0123] The wavelength conversion layer 150 according to another embodiment can be provided between the interlayer insulating film 117 and the protective layer 130, or between the substrate 100 and the interlayer insulating film 117, to overlap the opening area OA.

[0124] In a first example, the wavelength conversion layer 150 includes a color filter that transmits only a wavelength of a color set for a pixel among light emitted from the light emitting element ED to the substrate 100. The wavelength conversion layer 150 according to an embodiment can transmit only light having a red, green, or blue wavelength. In the light emitting display apparatus according to an embodiment of the disclosure, when one unit pixel includes first to third pixels adjacent to each other, the wavelength conversion layer disposed in the first pixel can include a red color filter, the wavelength conversion layer disposed in the second pixel can include a green color filter, and the wavelength conversion layer disposed in the third pixel can include a blue color filter. Also, in the light emitting display apparatus according to an embodiment of the disclosure, one unit pixel can further include a white pixel in which the wavelength conversion layer is not formed.

[0125] In a second example, the wavelength conversion layer 150 can include quantum dots having a certain size that can re-emit light to the substrate 100 according to light emitted from the light emitting element ED and expel light of a color set for the pixel. In this case, the quantum dots can be selected from CdS, CdSe, CdTe, CdZnSeS, ZnS, ZnSe, GaAs, GaP, GaAs-P, Ga-Sb, InAs, InP, InSb, AlAs, AlP, and AlSb. For example, the wavelength conversion layer of the first pixel can include quantum dots formed of CdSe or InP, the wavelength conversion layer of the second pixel can include quantum dots formed of CdZnSeS, and the wavelength conversion layer of the third pixel can include quantum dots formed of ZnSe. In this way, the light emitting display apparatus in which the wavelength conversion layer 150 includes quantum dots can achieve higher color reproducibility.

[0126] In a third example, the wavelength conversion layer 150 can include a color filter having quantum dots.

[0127] The light emitting display apparatus according to an embodiment of the disclosure can further include a bank layer 190 and an encapsulation layer 200.

[0128] The bank layer 190 serves to define the opening area OA in the pixel area PA and is disposed on the edge of the first electrode E1 and the overcoat layer 170. The bank layer 190 can be formed of an organic material such as a benzocyclobutene (BCB)-based resin, an acrylic-based resin, or a polyimide resin. Alternatively, the bank layer 190 can be formed of a photosensitive material including a black pigment. In this case, the bank layer 190 also serves as a light blocking member between adjacent pixels.

[0129] The bank layer 190 according to an embodiment is formed on the planar surface of the overcoat layer 170 to cover (or overlap) the edge of the first electrode E1 extending on the circuit area CA of the pixel area PA.

[0130] The bank layer 190 according to another embodiment can be disposed to cover (or overlap) the edge of the uneven portion 180. That is, the light-emitting layer EL can be formed on the first electrode E1, the bank layer 190, and the stepped portion between the first electrode E1 and the bank layer 190. In this case, when the light-emitting layer EL is formed in a small thickness on the stepped portion between the first electrode E1 and the bank layer 190, electrical contact (short circuit) can occur between the second electrode E2 and the first electrode E1. To prevent this problem, the opening area OA defined by the bank layer 190 is formed to have a two-dimensional size (e.g., a two-dimensional size in the X-Z plane) smaller than that of the uneven portion 180 covered by the overcoat layer 170. The end portion 190a of the bank layer 190 according to an embodiment is disposed at or near the edge of the uneven portion 180 to reduce the height difference between the first electrode E1 and the bank layer 190. That is, the end portion 190a of the bank layer 190 defines a boundary between the circuit area CA and the opening area OA of the pixel area PA, and can be disposed on the first electrode E1 overlapping the first curved portion 181b of the outermost protruding portion 181 among the plurality of protruding portions 181. For example, the end portion 190a of the bank layer 190 is located between the flat surface of the overcoat layer 170 and the bottom portion of the first curved portion 181b of the outermost protruding portion 181.

[0131] In some embodiments, the bank layer 190 can at least partially cover one or more of the recessed portions 183 disposed at the edge of the uneven portion 180. For example, the bank layer 190 can cover about one and a half of the recessed portions 183. In some embodiments, the end portion 190a of the bank layer 190 is located between the flat surface of the overcoat layer 170 and the bottom portion of the first curved portion 181b.

[0132] In addition, the wavelength conversion layer 150 according to one embodiment can extend to overlap the bank layer 190. For example, the wavelength conversion layer 150 can be located within the circuit area CA and can be located under portions of the bank layer 190.

[0133] The light-emitting layer EL and the second electrode E2 of the light-emitting element EL are also formed on the bank layer 190. That is, the light-emitting layer EL is formed on the substrate 100 in which the first electrode E1 and the bank layer 190 are disposed, and the second electrode E2 is formed to cover (or overlap) the light-emitting layer EL.

[0134] The encapsulation layer 200 is formed on the substrate 100 to cover (or overlap) the second electrode E2, i.e., the entire pixel. The encapsulation layer 200 serves to protect the thin film transistor, the light-emitting element ED, etc. from external impact, and to prevent the invasion of oxygen and / or moisture and particles into the light-emitting element ED.

[0135] For example, the encapsulation layer 200 can include at least one inorganic film. The encapsulation layer 200 can further include at least one organic film. For example, the encapsulation layer 200 can include a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer. The first and second inorganic encapsulation layers can include one inorganic material among a silicon oxide film SiOx, a silicon nitride film SiNx, a silicon oxynitride film SiON, a titanium oxide film TiOx, and an aluminum oxide film AlOx. The organic encapsulation layer can be formed of one organic material among an acrylic resin, an epoxy resin, a phenol resin, a polyamide resin, a polyimide resin, and a benzocyclobutene resin. The organic encapsulation layer can be referred to as a particle covering layer.

[0136] In some embodiments, the encapsulation layer 200 can be replaced with a filler surrounding the entire pixel. In some embodiments, the light emitting display apparatus according to the present disclosure further includes an encapsulation substrate 300 attached to the substrate 100 with a filler therebetween. The encapsulation substrate 300 can be formed of a glass material, a plastic material, or a metal material.

[0137] In addition, the light emitting display apparatus according to the present disclosure can further include a polarizing film attached to the rear surface (or the light extraction surface) 100a of the substrate 100. The polarizing film changes the external light reflected by the thin film transistor and / or the light rays provided in the pixel into a circular polarization state to improve the visibility and the contrast range of the light emitting display apparatus.

[0138] In the light emitting display apparatus according to one or more embodiments of the present disclosure, the path or direction of light emitted from the light emitting element ED is changed by the uneven portion 180 disposed in the effective emission area EA of the pixel to improve the light extraction efficiency, so that the brightness can be improved and the power consumption can be reduced. Since the light emitting display apparatus according to one or more embodiments of the present disclosure includes the light emitting layer EL having a profile different from that of the plurality of protruding portions 181 disposed in the opening area OA of the pixel, the external extraction efficiency of light can be further improved. That is, since the light emitting display apparatus according to the embodiments of the present disclosure includes the protruding portion 181 having a sharp top portion 181a and the light emitting layer EL having a convex curved shape overlapping the top portion 181a of the protruding portion 181, light that is not extracted to the outside due to repeated total reflection in the light emitting layer EL is reflected by the convex curved shape of the light emitting layer EL formed on the top portion 181a of the protruding portion 181 of the light emitting element ED and extracted to the outside, so that the external extraction efficiency of light can be further improved.

[0139] Figure 6 is a cross-sectional view taken along line I-I' in Figure 5 . Figure 7 is a microscope image of the protruding portion shown in Figure 6 . Figure 8 is a cross-sectional view taken along line I-I' in Figure 6FIG. 2 is a graph showing the slope of the first curved portion in the protruding portion shown in FIG. 1. These are graphs showing the cross-sectional structure of the uneven portion and the light emitting element according to an embodiment of the disclosure.

[0140] Referring to Figures 6 to 8 The uneven portion 180 according to an embodiment of the disclosure includes a plurality of protruding portions 181 having a top portion 181a (or a first pointed top portion), thereby extracting light that is not extracted to the outside due to repeated total reflection in the light emitting layer EL to the outside. Accordingly, the external extraction efficiency of light is determined according to the shape of the plurality of protruding portions 181 and the light emitting element ED.

[0141] Each of the plurality of protruding portions 181 includes a lower area LA, a middle area MA, and an upper area UA with respect to the height H thereof.

[0142] The lower area LA is defined as an area in which the height of the protruding portion 181 corresponds to a first height h1 between the bottom portion 181c of the protruding portion 181 and a position at a half height H / 2 of the total height H between the bottom portion 181c and the top portion 181a of the protruding portion 181. The first height h1 is not a specific height, but indicates a height range between the height at the bottom portion 181c and the height of half of the total height H. Accordingly, the lower area LA can be an area in which the height of the protruding portion 181 is between the height of the bottom portion 181c and the half height H / 2.

[0143] The middle area MA is disposed between the lower area LA and the upper area UA, and is defined as an area in which the height of the protruding portion 181 corresponds to a second height h2 between a position at the half height H / 2 and a position at a 4 / 5 height 4H / 5 of the total height H between the bottom portion 181c and the top portion 181a of the protruding portion 181. Accordingly, the middle area MA can be an area in which the height of the protruding portion 181 is between the half height H / 2 and the 4 / 5 height 4H / 5.

[0144] The upper area UA is disposed on the middle area MA and is defined as an area in which the height of the protruding portion 181 corresponds to a third height h3 between a position at the 4 / 5 height 4H / 5 of the total height H between the bottom portion 181c and the top portion 181a of the protruding portion 181 and the top portion 181a. Accordingly, the upper area UA can be an area in which the height of the protruding portion 181 is between the 4 / 5 height and the pointed top of the top portion 181a.

[0145] Each of the plurality of protruding portions 181 includes a lower section (or lower protruding portion) with respect to a position of one-half height H / 2 and an upper section (or upper protruding portion). For example, the lower section of each of the plurality of protruding portions 181 can include a lower area LA, and the upper section of each of the plurality of protruding portions 181 can include a middle area MA and an upper area UA.

[0146] Each of the plurality of protruding portions 181 includes a first curved portion 181b disposed concave between a top portion 181a and a bottom portion 181c, and the protruding portion has a triangular cross-sectional structure including an apex corresponding to the top portion 181a, a bottom side corresponding to the bottom portion 181c, and oblique sides OS1 and OS2 corresponding to the first curved portion 181b. The oblique sides OS1 and OS2 are not necessarily aligned with the boundaries of the curved portion 181b, as the curved portion 181b is curved, and the oblique sides can be defined as straight lines that extend directly between the apex (e.g., the pointed tip of the top portion 181a) and the bottom portion 181c (e.g., the center point of the concave portion 183).

[0147] The top portion 181a of each of the plurality of protruding portions 181 is formed as a pointed tip structure to improve light extraction efficiency of the pixel, and the first curved portion 181b of each of the plurality of protruding portions 181 is formed as a concave curved shape between the top portion 181a and the bottom portion 181c.

[0148] The first curved portion 181b of each of the plurality of protruding portions 181 has a tangent line slope that gradually decreases from the top portion 181a to the bottom portion 181c. In this case, the tangent line slope is defined as an angle between a horizontal line parallel to the bottom portion 181c of the protruding portion 181 and a tangent line of the first curved portion 181b, which can be measured at any point along the first curved portion 181b, for example.

[0149] The first curved portion 181b according to an embodiment has a larger tangent line slope, i.e., a maximum tangent line slope, in the effective emission area EA, and the effective emission area EA can include a position of 4 / 5 height 4H / 5 of the protruding portion 181. In some embodiments, the first curved portion 181b has the maximum tangent line slope at or above a position of 4 / 5 height 4H / 5, which is a boundary between the middle area MA and the upper area UA of the protruding portion 181. For example, the first curved portion 181b can have a first tangent line slope θ1 at a position of one-half height H / 2 of the protruding portion 181 and a second tangent line slope θ2 at a position of 4 / 5 height 4H / 5 of the protruding portion 181. As Figure 8As shown, the second tangent slope θ2 has an angle greater than the first tangent slope θ1, so that light emitted from the effective emission area EA of the protruding portion 181 is not trapped in the light emitting element ED but is extracted to the outside as much as possible. When the second tangent slope θ2 has an angle smaller than the first tangent slope θ1, the upper area UA of the protruding portion 181 has a gentler slope, and thus light emitted from the effective emission area EA is not extracted to the outside due to total reflection but is trapped in the light emitting element ED, thereby reducing light extraction efficiency.

[0150] The light emitting element ED according to some embodiments of the disclosure has a maximum light amount emitted at a maximum tangent slope of the protruding portion 181. When the maximum tangent slope of the protruding portion 181 is located in the effective emission area EA, light emitted from the light emitting element ED propagates at an angle smaller than the total reflection threshold, and as the external emission efficiency increases due to multiple reflections, a maximum light extraction efficiency can be achieved. For this purpose, in some embodiments of the disclosure, by positioning the maximum tangent slope of the protruding portion 181 in the effective emission area EA of the protruding portion 181, for example, at or above a position of 4 / 5 height 4H / 5, which is a boundary between the middle area MA and the upper area UA, the external extraction efficiency of light emitted from the effective emission area EA of the protruding portion 181 can be improved. In addition, by gradually increasing the maximum tangent slope of the protruding portion 181 from the position of 4 / 5 height 4H / 5 to the top portion 181a, the external extraction efficiency of light emitted from the effective emission area EA of the protruding portion 181 can be maximized.

[0151] The first electrode E1 of the light emitting element ED according to the disclosure is formed to be in contact with the surfaces of the plurality of protruding portions 181 and to have a relatively small thickness, thus having a profile of the profile of the plurality of protruding portions 181. For example, the first electrode E1 is formed to cover (or overlap) the plurality of protruding portions 181 in a conformal manner by a process of depositing a transparent conductive material. For example, the first electrode E1 can include a second pointed portion E1a having a sharp shape formed on the top portion 181a of each of the plurality of protruding portions 181 and a second curved portion E1b having a concave curved shape formed on the first curved portion 181b of each of the plurality of protruding portions 181. In some embodiments, the second curved portion E1b has a symmetrical structure with respect to the second pointed portion E1a, for example, the second curved portion E1b can extend from opposite sides of the second pointed portion E1a in a cross-sectional view, and can be symmetrical with respect to each other.

[0152] The light-emitting layer EL of the light-emitting element ED according to the present disclosure is formed to have a thickness that increases from the upper region UA to the lower region LA according to the shape of the protruding portion 181. For example, when the light-emitting layer EL is deposited using a deposition method, the deposition material for the light-emitting layer EL has flatness in the vertical direction Z, so depending on the tangent slope of the protruding portion 181, the light-emitting layer EL has different thicknesses in the upper region UA, the middle region MA, and the lower region LA of the protruding portion 181. That is, the light-emitting layer EL has a minimum thickness in the upper region UA of the protruding portion 181, where the tangent slope is relatively large, and a maximum thickness in the lower region LA of the protruding portion 181, where the tangent slope is relatively low (or relatively gentle).

[0153] When the light-emitting layer EL includes an organic light-emitting layer, emission of light from the light-emitting element ED mainly occurs in regions having a high current density. In the light-emitting element ED according to the embodiment of the present disclosure, due to the relatively high current density, relatively strong light emission SE occurs in the upper region UA and the middle region MA of the protruding portion 181 having a relatively small thickness, and due to the relatively low current density, relatively weak (or slight) light emission WE occurs in the lower region LA of the protruding portion 181 having a relatively large thickness. Therefore, the upper region UA and the middle region MA of each of the plurality of protruding portions 181 are defined as effective emission regions EA (or partial emission regions) in the opening region OA, and the lower region LA of each of the plurality of protruding portions 181 is defined as a non-effective emission region NEA (or a non-emission region) in the opening region OA.

[0154] The light-emitting layer EL is formed to cover (or overlap) the first electrode E1 or the plurality of protruding portions 181 in a non-conformal manner. For example, the light-emitting layer EL includes a curved or rounded upper portion ELa (which can be referred to herein as a raised portion ELa, or a convex protruding portion) that overlaps the top portion 181a of each of the plurality of protruding portions 181, and a third curved portion ELb that overlaps the first curved portion 181b of each of the plurality of protruding portions 181.

[0155] The third curved portion ELb is formed on the second curved portion E1b of the first electrode E1 and has a symmetrical structure with respect to the raised portion EL a (e.g., the third curved portion ELb can extend from opposite sides of the raised portion EL a and can be symmetrical with respect to each other in a cross-sectional view). The light-emitting layer EL including the third curved portion ELb is formed to have a thickness that gradually increases toward the bottom portion 181c of the protruding portion 181 or the recessed portion 183 of the uneven portion 180. That is, the third curved portion ELb of the light-emitting layer EL has a first thickness in the upper region (including the middle region MA and the upper region UA) including the top portion 181a of the protruding portion 181, and has a second thickness greater than the first thickness in the bottom portion 181c of the protruding portion 181. Therefore, due to the relatively small first thickness, the light-emitting layer EL strongly emits light in the upper region (including the middle region MA and the upper region UA) having a high current density in each of the plurality of protruding portions 181, and thus light extraction efficiency can be improved. On the other hand, due to the relatively large second thickness, the light-emitting layer EL weakly emits light in the lower region LA having a low current density in each of the plurality of protruding portions 181, and thus power consumption can be reduced.

[0156] The raised portion EL a is formed to be convex to have a non-conformal shape with respect to the sharp top portion 181a of each of the plurality of protruding portions 181. That is, the raised portion EL a protrudes from the third curved portion ELb overlapping the top portion 181a of each of the plurality of protruding portions 181 to cover (or overlap) the top portion 181a of each of the plurality of protruding portions 181. The raised portion EL a can be referred to as a convex protruding portion.

[0157] The raised portion EL a is formed to have a curvature for preventing light (which is totally reflected due to emission of light from the light-emitting layer EL and is incident in the light-emitting layer EL) from being totally reflected again in the light-emitting layer. For example, the raised portion EL a can have a dome or bell shape structure having a convex cross-sectional shape. The raised portion EL a reflects light that is totally reflected in the light-emitting layer EL and is incident due to emission of light from the light-emitting layer EL toward the substrate 100 to increase the external extraction efficiency of light emitted from the light-emitting layer EL. For example, the raised portion EL a functions as a lens that reflects light emitted from the effective emission area EA of the light-emitting element ED and is incident toward the substrate 100.

[0158] The elevation portion ELa according to an embodiment can have a dome structure having an inflection portion IP. That is, the elevation portion ELa according to an embodiment can include an apex portion AP, the inflection portion IP, a convex surface CS1, and a concave surface CS2. The inflection portion IP can be located at an inflection point between the convex surface CS1 and the concave surface CS2. The elevation portion ELa has a symmetrical structure with respect to the apex portion AP.

[0159] The apex portion AP overlaps with a top portion 181a of each of the plurality of protrusion portions 181. That is, the apex portion AP overlaps with a second apex portion E1a having a sharp shape of the first electrode E1.

[0160] The inflection portion IP is located between the apex portion AP and the third curved portion ELb. For example, the inflection portion IP can be located on the first curved portion 181b between the top portion 181a of the protrusion portion 181 and a position of 4 / 5 of the height 4H / 5 to reflect light totally reflected from the top portion 181a of the protrusion portion 181 toward the substrate, whereby the external extraction efficiency of light can be improved. The inflection portion IP is also referred to as an inflection point.

[0161] The convex surface CS1 is formed to be convex from the apex portion AP. That is, the convex surface CS1 is formed to be convex between the apex portion AP and the inflection portion IP. The concave surface CS2 is formed to be concave from the convex surface CS1. That is, the concave surface CS2 is formed to be concave between the inflection portion IP and the third curved portion ELb. The convex surface CS1 and the concave surface CS2 change a path or a direction of light incident on the elevation portion ELa from the light emitting element ED toward the substrate to prevent total reflection of the incident light, whereby the light extraction efficiency of the pixel can be improved.

[0162] Since the second electrode E2 of the light emitting element ED according to the disclosure is formed to be in contact with a surface of the light emitting layer EL and to have a thickness smaller than that of the light emitting layer EL, the second electrode E2 has a profile conforming to that of the light emitting layer EL. For example, the second electrode E2 can include a convex dome portion E2a overlapping with the elevation portion ELa of the light emitting layer EL and a fourth curved portion E2b formed on the third curved portion ELb of the light emitting layer EL.

[0163] Figure 9 is a microscope image showing an uneven portion provided in a pixel in a light emitting display device according to an example of the disclosure. Figure 10 is a microscope image showing an uneven portion provided in a pixel in a light emitting display device according to an example of the disclosure. Figure 9 is a graph showing a roughness measurement result of the uneven portion shown in

[0164] Referring toFigure 9 、 Figure 10 and Figure 5 According to some embodiments, a unit area FA (or unit measurement area) of the uneven portion 180 can be defined as a size corresponding to a size of the bottom surface of the protruding portion 181 and four complete recessed portions 183 adjacent to each other in the first direction X and the second direction Y, with respect to the unit area FA. For example, the unit area FA can have a size including one complete recessed portion 183 (e.g., in a central section of the unit area FA) and six halves of the recessed portions 183 surrounding the one recessed portion 183. In some embodiments, the unit area FA has a first length (or horizontal width) Fax connecting top portions 181a of three protruding portions 181 adjacent to each other in the first direction X, and a second length (or vertical width) Fay connecting middle portions of two protruding portions 181 adjacent to each other in the second direction Y, with one recessed portion 183 interposed between the two protruding portions 181.

[0165] In the light emitting display device according to some embodiments of the disclosure, depending on the shape and height of the protruding portion 181 disposed in the uneven portion 180 of each pixel, the surface area of the uneven portion 180 and the surface area of the light emitting element ED can be different from each other. That is, in the light emitting element ED, the first electrode E1 is formed to be conformal to the protruding portion 181, the light emitting layer EL is formed to be non-conformal to the first electrode E1, and the second electrode E2 is formed to be conformal to the light emitting layer EL, whereby the surface area of the second electrode E2 disposed as the uppermost layer of the light emitting element ED can be different from the surface area of the uneven portion 180 due to the light emitting layer EL formed to be non-conformal to the protruding portion 181.

[0166] The surface area and the surface area increase rate SIR of the second electrode E2 and the surface area and the surface area increase rate SIR of the uneven portion 180 with respect to the unit area at the first to fifth points (e.g., first to fifth sections) are described in Table 1, which are different from each other and set on the pixel array unit of the light emitting display device according to the examples of the disclosure.

[0167] [Table 1]

[0168]

[0169]

[0170] In Table 1, 1st to 5th Experimental Examples 1st to 5th indicate measurement results of unit area at first to fifth points and a surface area and a surface area increase rate SIR of the uneven portion 180 provided in the unit area. 1st to 5th Experimental Examples 2nd to 5th indicate measurement results of unit area at first to fifth points and a surface area and a surface area increase rate SIR of the second electrode provided in the unit area. In Table 1, the unit area is set with respect to a bottom portion of the protruding portion 181, and has different values for each experimental example due to measurement errors of a measurement device, but has substantially the same value within a range of measurement errors. The surface area in 1st to 5th Experimental Examples 1st to 5th is a measurement result of a surface area per unit area of the uneven portion 180 in a state in which the light emitting element including the first electrode, the light emitting layer, and the second electrode has been removed in the light emitting display device, and the surface area in 1st to 5th Experimental Examples 2nd to 5th is a measurement result of a surface area per unit area of the second electrode in a state in which the light emitting element including the first electrode, the light emitting layer, and the second electrode has not been removed in the light emitting display device.

[0171] As can be seen from Table 1, the surface area of the uneven portion 180 is greater than the unit area. In this case, it can be seen that the surface area increase rate SIR of the uneven portion 180 including the protruding portion 181 is in the range of 1.25 to 1.34. On the other hand, it can be seen that the surface area of the second electrode is greater than the unit area and is less than the surface area of the uneven portion 180. In this case, it can be seen that the surface area increase rate SIR of the second electrode provided on the uneven portion 180 is in the range of 1.18 to 1.27 with respect to the unit area of the second electrode provided on the uneven portion 180. As a result, it can be considered that the uneven portion 180 has a surface area increase rate SIR that increases with respect to the unit area according to the total height and shape of the protruding portion 181, and it can be seen that the surface area increase rate SIR of the second electrode is less than the surface area increase rate SIR of the uneven portion 180 because the light emitting layer is formed to be non-conformal to the uneven portion 180. For example, since the light emitting layer has a thickness that gradually increases toward the bottom portion 181c of the protruding portion 181 or the recessed portion 183 of the uneven portion 180, the surface area increase rate SIR of the second electrode is less than the surface area increase rate SIR of the uneven portion 180 due to a decrease in the surface area of the light emitting layer formed on the recessed portion 183.

[0172] In the light-emitting display device according to one or more embodiments of the present disclosure, the emission efficiency of the light-emitting element ED is determined in accordance with the shape of the protruding portion 181, and the light extraction efficiency is determined in accordance with the shape of the protruding portion 181 and the shape of the light-emitting element ED. As the emission efficiency of the light-emitting element ED increases, the current efficiency enhancement of the light-emitting display device according to the embodiments of the present disclosure increases. Thus, the shape of the protruding portion 181 can be used as a factor for determining the emission efficiency, the light extraction efficiency, and the current efficiency enhancement of the light-emitting display device. Examples of the factor for determining the shape of the protruding portion 181 include the diameter D, the height H, the width F (full width half maximum) of half the height, the aspect ratio AR, the aspect ratio F_AR of half the height, the sharpness Rm of half the height, the width F' of 4 / 5 of the height, the aspect ratio F'_AR of 4 / 5 of the height, and the tangent slope of the protruding portion 181.

[0173] The aspect ratio AR of the protruding portion 181 refers to the ratio of the height H of the protruding portion 181 to the radius D / 2, and is defined as a value H / (D / 2) obtained by dividing the height H by the radius D / 2 of the bottom side.

[0174] The aspect ratio F_AR of half the height of the protruding portion 181 refers to the ratio of the height H of the protruding portion 181 to the width F of half the height, and can be defined as a value (H / 2) / (F / 2) obtained by dividing half the height H / 2 by the radius F / 2 at the position of half the height H / 2, or can be defined as a value H / F obtained by dividing the height H by the width F of half the height. In this case, the width F of half the height can refer to the width of the bottom side at the position of half the height (or 50% point) H / 2 of the height H with respect to the bottom portion 181c (or bottom side) of the protruding portion 181.

[0175] The sharpness Rm of half the height of the protruding portion 181 refers to the ratio of the aspect ratio F_AR of half the height to the aspect ratio AR, and can be defined as a value (F_AR) / (AR) obtained by dividing the aspect ratio F_AR of half the height by the aspect ratio AR.

[0176] The aspect ratio F'_AR of 4 / 5 of the height is the aspect ratio of the width F' at 4 / 5 of the height 4H / 5, refers to the ratio of 4 / 5 of the height 4H / 5 to half the width F' / 2 at the position of 4 / 5 of the height 4H / 5, and can be defined as a value (4H / 5) / (F' / 2) obtained by dividing 4 / 5 of the height 4H / 5 by half the width F' / 2 at the position of 4 / 5 of the height 4H / 5. In this case, the width F' of 4 / 5 of the height of the protruding portion 181 can refer to the width of the bottom side at the position of 4 / 5 of the total height H (or 80% point) 4H / 5 of the protruding portion 181 with respect to the bottom portion 181c (or bottom side) of the protruding portion 181.

[0177] In the protruding portion 181 according to the disclosure, a factor for determining the shape of the top portion 181a can be the 4 / 5 height aspect ratio F'_AR. Thus, the 4 / 5 height aspect ratio F'_AR of the protruding portion 181 is in the range of 0.35 to 0.6. That is, the protruding portion 181 has the 4 / 5 height aspect ratio F'_AR in the range of 0.35 to 0.6, and thus includes the top portion 181a having a sharp pointed structure.

[0178] When the 4 / 5 height aspect ratio F'_AR of the protruding portion 181 is in the range of 0.35 to 0.6, the light extraction efficiency is higher than when the 4 / 5 height aspect ratio F'_AR of the protruding portion 181 is less than 0.35 or greater than 0.6. For example, when the 4 / 5 height aspect ratio F'_AR of the protruding portion 181 is greater than 0.6, the tangent slope of the upper region UA of the protruding portion 181 increases as the height H of the protruding portion 181 increases, and the amount of light trapped in the light emitting element ED increases, thereby reducing the light extraction efficiency. When the 4 / 5 height aspect ratio F'_AR of the protruding portion 181 is less than 0.35, the third height h3 of the upper region UA of the protruding portion 181 is excessively reduced or flattened to form a waveguide, and thus the light emitted from the light emitting element ED does not propagate to the substrate but is repeatedly totally reflected and trapped in the light emitting element ED, thereby the light extraction efficiency can be reduced. In particular, when the protruding portion 181 has the 4 / 5 height aspect ratio F'_AR less than 0.35, the top portion 181a of the protruding portion 181 has a cross-sectional structure of a bell shape or a Gaussian curve, which is not sharp, and thus the light emitting element ED has a shape conforming to the profile of the protruding portion 181, whereby the elevation portion ELa is not formed, and the effect based on the elevation portion ELa cannot be expected.

[0179] The shape of the protruding portion 181 can vary depending on the aspect ratio AR, the half height aspect ratio F_AR, and the half height sharpness Rm, even when the 4 / 5 height aspect ratio F'_AR of the protruding portion 181 is in the range of 0.35 to 0.6.

[0180] In the light emitting display apparatus according to the present disclosure, since the uneven portion including the pointed top portion disposed in the opening region of each pixel includes a plurality of protruding portions, the uneven portion has a surface area increase rate based on the shape of the protruding portions and the interval between the protruding portions. The surface area increase rate of the uneven portion is represented by the ratio of the area of the protruding portions to the unit area. For example, the surface area increase rate of the uneven portion is defined as a value obtained by dividing the area of the protruding portions located in the unit area by the unit area. The surface area increase rate of the uneven portion is a factor indicating the shape of the protruding portions located in the unit area, and thus can be used as an additional factor for determining the emission efficiency, the light extraction efficiency, and the current efficiency enhancement of the light emitting display apparatus.

[0181] The uneven portion 180 according to one or more embodiments of the present disclosure has a surface area increase rate of 1.05 to 2.0 with respect to the unit area.

[0182] The light extraction efficiency of each pixel according to one or more embodiments of the present disclosure can vary depending on the aspect ratio AR, the sharpness Rm of the half height, the aspect ratio F_AR of the half height, and the aspect ratio F'_AR of the 4 / 5 height, even when the surface area increase rate of the uneven portion 180 is in the range of 1.05 to 2.0. Therefore, when the surface area increase rate of the uneven portion 180 is in the range of 1.05 to 2.0, the aspect ratio AR of the protruding portion 181 is in the range of 0.35 to 0.48, the aspect ratio F_AR of the half height is in the range of 0.45 to 0.60, the aspect ratio F'_AR of the 4 / 5 height is in the range of 0.45 to 0.60, and the sharpness Rm of the half height is in the range of 1.1 to 2.0.

[0183] Figure 11A FIG. 7 is a graph illustrating the current efficiency enhancement of a white pixel corresponding to the aspect ratio of the protruding portion in the light emitting display apparatus according to the present disclosure. Figure 11B FIG. 8 is a graph illustrating the current efficiency enhancement of a red pixel, a green pixel, and a blue pixel corresponding to the aspect ratio of the protruding portion in the light emitting display apparatus according to the present disclosure.

[0184] Referring to Figure 11A and 11B as well as Figure 6When the aspect ratio AR of the protruding portion 181 in the light-emitting display device according to one or more embodiments of the present disclosure is within a range of 0.35 to 0.65, it can be seen that the current efficiency enhancement is more excellent (e.g., greater current efficiency enhancement) than when the aspect ratio AR of the protruding portion 181 is less than 0.35 or greater than 0.65. That is, it can be seen that the current efficiency enhancement of the light-emitting element ED tends to decrease when the aspect ratio AR of the protruding portion 181 is greater than 0.65, and has a maximum value when the aspect ratio AR of the protruding portion 181 is within a range of 0.35 to 0.65.

[0185] When the aspect ratio AR of the protruding portion 181 is less than 0.35, the height H of the protruding portion 181 is excessively reduced or flattened to form a waveguide. As a result, light emitted from the light-emitting element ED does not propagate to the substrate, but is repeatedly totally reflected and trapped in the light-emitting element ED, thereby reducing light extraction efficiency. When the aspect ratio AR of the protruding portion 181 is greater than 0.65, the height H of the protruding portion 181 is excessively increased, the aspect ratio AR is reduced, and reflection of external light increases, thereby failing to achieve black brightness.

[0186] Therefore, when the aspect ratio AR of the protruding portion 181 is within the range of 0.35 to 0.65, maximum current efficiency enhancement may be achieved, and the light emitting element ED may have maximum emission efficiency in this case.

[0187] Figure 12A is a graph showing enhancement of current efficiency of a white pixel corresponding to an aspect ratio of half the height of a protruding portion in a light emitting display device according to the present disclosure. Figure 12B is a graph showing enhancement of current efficiency of red pixels, green pixels, and blue pixels corresponding to an aspect ratio of half the height of a protruding portion in a light emitting display device according to the present disclosure.

[0188] Reference Figure 12A and 12B as well as Figure 6 When the aspect ratio F_AR at half the height of the protruding portion 181 in the light-emitting display device according to the present disclosure is within the range of 0.45 to 0.7, it can be seen that the current efficiency enhancement is more excellent (e.g., greater current efficiency enhancement) than when the aspect ratio F_AR at half the height of the protruding portion 181 is less than 0.45 or greater than 0.7. That is, it can be seen that the current efficiency enhancement of the light-emitting element ED tends to decrease when the aspect ratio F_AR at half the height of the protruding portion 181 is greater than 0.7, and has a maximum value when the aspect ratio F_AR at half the height of the protruding portion 181 is within the range of 0.45 to 0.7.

[0189] When the aspect ratio F_AR of the half height of the protruding portion 181 is less than 0.45, the heights h2+h3 of the middle area MA and the upper area UA of the protruding portion 181 are excessively reduced or flattened to form a waveguide, and thus the light emitted from the light emitting element ED does not propagate to the substrate but is repeatedly totally reflected and trapped in the light emitting element ED, thereby the light extraction efficiency can be reduced. When the aspect ratio F_AR of the half height of the protruding portion 181 is greater than 0.7, the height H of the protruding portion 181 is excessively increased, the aspect ratio F_AR of the half height is reduced, and the reflection of external light is increased, thereby the black luminance cannot be achieved.

[0190] Therefore, when the aspect ratio F_AR of the half height of the protruding portion 181 is in the range of 0.45 to 0.7, the maximum current efficiency enhancement can be achieved, and the light emitting element ED can have the maximum emission efficiency in this case.

[0191] On the other hand, in the light emitting display device according to some embodiments of the disclosure, when the sharpness Rm of the half height of the protruding portion 181 is 1, the protruding portion 181 has a triangular shape. When the sharpness Rm of the half height of the protruding portion is less than 1, the protruding portion 181 has a semi-circular shape. When the sharpness Rm of the half height of the protruding portion 181 is greater than 1, the protruding portion 181 has a bell shape. Therefore, the sharpness Rm of the half height of the protruding portion 181 according to the disclosure is in the range of 1.1 to 2.0, so that the maximum tangent slope of the first curved portion 181b is located between the middle area MA and the upper area UA. In this case, when the sharpness Rm of the half height of the protruding portion 181 is less than 1.1, the top portion 181a of the protruding portion 181 is not sharp but has a cross-sectional structure of a bell or Gaussian curve, whereby no raised portion ELa is formed in the light emitting layer EL formed on the top portion 181a of the protruding portion 181, and thus the effect based on the raised portion ELa cannot be expected. When the sharpness Rm of the half height of the protruding portion 181 is greater than 2.0, the width of the upper area UA of the protruding portion 181 is narrow, whereby the top portion 181a of the protruding portion 181 cannot be formed sharp, and thus the effect based on the raised portion ELa cannot be expected.

[0192] Figure 13A is a graph showing the current efficiency enhancement of a white pixel corresponding to the aspect ratio of the 4 / 5 height of the protruding portion in the light emitting display device according to the disclosure. Figure 13B is a graph showing the current efficiency enhancement of a red pixel, a green pixel, and a blue pixel corresponding to the aspect ratio of the 4 / 5 height of the protruding portion in the light emitting display device according to the disclosure.

[0193] Referring to Figure 13A and 13B andFigure 6 When the aspect ratio F'_AR of the 4 / 5 height of the protruding portion 181 in each pixel of the light-emitting display device according to the present disclosure is in the range of 0.35 to 0.6, it can be seen that the current efficiency enhancement is more excellent (e.g., greater current efficiency enhancement) than the case where the aspect ratio F'_AR of the 4 / 5 height of the protruding portion 181 is less than 0.35 or greater than 0.76. That is, it can be seen that the current efficiency enhancement of the light-emitting element ED has a decreasing tendency when the aspect ratio F'_AR of the 4 / 5 height of the protruding portion 181 is greater than 0.6, and has a maximum value when the aspect ratio F'_AR of the 4 / 5 height of the protruding portion 181 is in the range of 0.35 to 0.6.

[0194] Therefore, when the aspect ratio F'_AR of the 4 / 5 height of the protruding portion 181 is in the range of 0.35 to 0.6, the maximum current efficiency enhancement can be achieved, and the light-emitting element ED can have the maximum emission efficiency in this case. For example, when the aspect ratio F'_AR of the 4 / 5 height of the protruding portion 181 is in the range of 0.4 to 0.5, the white pixel has a maximum current efficiency enhancement of about 50%, the red pixel has a maximum current efficiency enhancement of about 70%, the green pixel has a maximum current efficiency enhancement of about 50%, and the blue pixel has a maximum current efficiency enhancement of about 30%.

[0195] As a result, the protruding portion 181 according to some embodiments of the present disclosure has an aspect ratio F'_AR of the 4 / 5 height in the range of 0.35 to 0.6, such that the top portion 181a has a sharp pointed shape, and has a sharpness Rm of the half height in the range of 1.1 to 2.0, such that the effective emission area of the light-emitting element ED is located in the upper region of the protruding portion 181. For example, the protruding portion 181 can have a sharpness Rm of the half height in the range of 1.1 to 2.0, an aspect ratio AR in the range of 0.35 to 0.65, and an aspect ratio F_AR of the half height in the range of 0.45 to 0.7.

[0196] Figure 14 is a graph showing a linear or substantially linear relationship between the surface area of the uneven portion and the aspect ratio of the protruding portion in the light-emitting display device according to the present disclosure.

[0197] Referring to Figure 6 , Figure 9 and Figure 14It can be seen that, in the light emitting display apparatus according to the embodiment of the disclosure, the aspect ratio AR of the protruding portion 181 increases as the surface area of the uneven portion 180 increases. For example, depending on the surface area of the uneven portion 180, the aspect ratio AR of the protruding portion 181 is in the range of 0.35 to 0.48. According to a determination coefficient R2, which is based on a quadratic function obtained by a linear regression analysis of the aspect ratio AR of the protruding portion 181 with respect to the surface area of the uneven portion 180, it can be seen that the aspect ratio AR of the protruding portion 181 with respect to the surface area of the uneven portion 180 has a degree of consistency of about 58%.

[0198] Figure 15 FIG. 18 is a graph showing a linear relationship between the surface area of the uneven portion and the aspect ratio of the 4 / 5 height of the protruding portion in the light emitting display apparatus according to the disclosure.

[0199] Referring to Figure 6 , Figure 9 and Figure 15 , it can be seen that, in the light emitting display apparatus according to the disclosure, the aspect ratio F'_AR of the 4 / 5 height of the protruding portion 181 increases as the surface area of the uneven portion 180 increases. For example, depending on the surface area of the uneven portion 180, the aspect ratio F'_AR of the 4 / 5 height of the protruding portion 181 is in the range of 0.4 to 0.7. According to a determination coefficient R2, which is based on a quadratic function obtained by a linear regression analysis of the aspect ratio F'_AR of the 4 / 5 height of the protruding portion 181 with respect to the surface area of the uneven portion 180, it can be seen that the aspect ratio F'_AR of the 4 / 5 height of the protruding portion 181 with respect to the surface area of the uneven portion 180 has a degree of consistency of about 52%.

[0200] Figure 16A FIG. 19 is a graph showing the light extraction efficiency corresponding to the aspect ratio of the protruding portion in the light emitting display apparatus according to the disclosure. Figure 16B FIG. 20 is a graph showing the light extraction efficiency corresponding to the surface area increase rate of the uneven portion in the light emitting display apparatus according to the disclosure. Figure 16C FIG. 21 is a graph showing the current efficiency enhancement corresponding to the surface area increase rate of the uneven portion in the light emitting display apparatus according to the disclosure.

[0201] Referring to Figure 6 , 9 and 16A, it can be seen that, when the aspect ratio AR of the protruding portion 181 is in the range of 0.35 to 0.48, the light emitting display apparatus according to the disclosure has a luminance of about 2400 cd / m 2 to 3100 cd / m 2It can be seen that the light extraction efficiency of the light emitting display device according to the present disclosure has a degree of consistency of about 45% with respect to the aspect ratio AR of the protruding portion 181, according to a determination coefficient R2 based on a quadratic function obtained by linear regression analysis of the light extraction efficiency with respect to the aspect ratio AR of the protruding portion 181.

[0202] Referring to Figure 6 , 9 and 16B, it can be seen that the light emitting display device according to the present disclosure has a light extraction efficiency of about 2200 cd / m 2 to 3200 cd / m 2 when the surface area increase ratio SIR of the uneven portion 180 is in the range of 1.1 to 2.0. According to a determination coefficient R2 based on a quadratic function obtained by linear regression analysis of the light extraction efficiency with respect to the surface area increase ratio SIR of the uneven portion 180, it can be seen that the light extraction efficiency has a degree of consistency of about 63% with respect to the surface area increase ratio SIR of the uneven portion 180.

[0203] Referring to Figure 6 , 9 and 16C, it can be seen that the light emitting display device according to the present disclosure has a current efficiency enhancement of about 5% or more when the surface area increase ratio SIR of the uneven portion 180 is in the range of 1.1 to 2.0. According to a determination coefficient R2 based on a quadratic function obtained by linear regression analysis of the current efficiency enhancement with respect to the surface area increase ratio SIR of the uneven portion 180, it can be seen that the current efficiency enhancement has a degree of consistency of about 63% with respect to the surface area increase ratio SIR of the uneven portion 180.

[0204] Figure 17A is a graph showing a distribution of light extraction efficiency corresponding to the aspect ratio of the protruding portion and the sharpness of the protruding portion in the light emitting display device according to the present disclosure. Figure 17B is a graph showing a distribution of light extraction efficiency corresponding to the surface area increase ratio of the uneven portion and the aspect ratio of the 4 / 5 height of the protruding portion in the light emitting display device according to the present disclosure.

[0205] Referring to Figure 6 , 9 and 17A, it can be seen that the light extraction efficiency of the light emitting display device according to the present disclosure has a relatively wide distribution depending on the aspect ratio AR of the protruding portion 181 and the sharpness Rm of the protrusion. For example, when the protruding portion 181 has an aspect ratio AR of 0.38, it can be seen that the light extraction efficiency ranges from 2700 cd / m 2 to 3100 cd / m 2Therefore, it can be seen that the aspect ratio AR of the protrusion 181 and the sharpness Rm of the protrusion 181 do not satisfactorily represent the light extraction efficiency of the light emitting display device.

[0206] Referring to Figure 6 , Figure 9 and Figure 17B , it can be seen that the light extraction efficiency of the light emitting display device according to the example of the present disclosure has a relatively narrow distribution depending on the surface area increase rate SIR of the uneven portion 180 and the aspect ratio F'_AR of the 4 / 5 height of the protrusion 181. For example, when the surface area increase rate SIR of the uneven portion 180 is 1.35, it can be seen that the light extraction efficiency ranges from 2900 cd / m 2 to 3100 cd / m 2 depending on the aspect ratio F'_AR of the 4 / 5 height of the protrusion 181. In particular, in the light emitting display device according to the present disclosure, when the aspect ratio F'_AR of the 4 / 5 height is in the range of 0.45 to 0.6, the surface area increase rate SIR of the uneven portion 180 is in the range of 1.3 to 1.43, it can be seen that the light extraction efficiency is equal to or greater than 3000 cd / m 2 . Therefore, it can be seen that the surface area increase rate SIR of the uneven portion 180 and the aspect ratio F'_AR of the 4 / 5 height of the protrusion 181 can satisfactorily represent the light extraction efficiency of the light emitting display device. Therefore, the surface area increase rate SIR of the uneven portion 180 can be used as an additional factor for determining the emission efficiency, light extraction efficiency, and current efficiency enhancement of the light emitting display device. When considering improving the light extraction efficiency of the light emitting display device based on the surface area increase rate SIR of the uneven portion 180, the surface area increase rate SIR of the uneven portion 180 is in the range of 1.05 to 2.0. In this case, the protrusion 181 can have an aspect ratio AR in the range of 0.35 to 0.48, an aspect ratio F_AR of the half height in the range of 0.45 to 0.60, an aspect ratio F'_AR of the 4 / 5 height in the range of 0.45 to 0.6, and a sharpness Rm of the half height in the range of 1.5 to 2.0.

[0207] Figure 18 is a simulation diagram showing a light path corresponding to the shape of the protrusion and the light emitting layer according to the example of the present disclosure.

[0208] Referring to Figure 18, the top portion of the protruding portion and the top portion of the light emitting layer according to the example of the present disclosure have different shapes (or non-conformal shapes). That is, the top portion of the protruding portion according to the example of the present disclosure has a sharp pointed top structure (or pointed top portion), and the top portion of the light emitting layer has a convex curved shape (or raised portion). In the example of the present disclosure, it can be seen that since the top portion of the protruding portion and the top portion of the light emitting layer have different shapes, the light emitted from the effective emission area EA of the light emitting element ED is totally reflected and propagates to the top portion of the protruding portion in the light emitting element ED, and then reflected by the raised portion of the light emitting layer having a convex curved shape, and is extracted to the substrate. That is, it can be seen that in the example of the present disclosure, most of the light propagating between the top portion of the protruding portion and the raised portion of the light emitting layer is extracted to the substrate. Therefore, since the light emitting display device according to the example of the present disclosure includes a light emitting layer, the contour of which does not conform to the contours of the multiple protruding portions formed in the opening area in each pixel, the light extraction efficiency can be enhanced.

[0209] Figure 19 is a photograph showing an actual emission image of a pixel in a light-emitting display device according to an example of the present disclosure.

[0210] from Figure 19 It can be seen that in the light-emitting display device according to the example of the present disclosure, the light-emitting element includes an effective emission area EA overlapping with the upper area of ​​the protrusion and a non-effective emission area NEA overlapping with the lower area of ​​the protrusion, which depends on the shape of the protrusion formed in the cover coating of the opening area. It can be seen that the effective emission area EA and the non-effective emission area NEA of the light-emitting element formed on the protrusion appear in the same way in the actual light-emitting image. Therefore, in the light-emitting display device according to the example of the present disclosure, by setting the aspect ratio of 4 / 5 of the height of the protrusion and setting the sharpness of half the height of the protrusion in consideration of the effective emission area of ​​the light-emitting element based on the shape of the protrusion, the emission efficiency and light extraction efficiency of the light-emitting element can be maximized, and power consumption can be reduced. In the light-emitting display device according to the example of the present disclosure, by setting the surface area increase rate of the uneven portion based on the protrusion and setting the aspect ratio, the aspect ratio of half the height, the aspect ratio of 4 / 5 of the height and the sharpness of the protrusion based on the surface area increase rate, the emission efficiency and light extraction efficiency of the light-emitting element can be maximized and power consumption can be reduced.

[0211] Hereinafter, a light emitting display device according to various embodiments of the present disclosure will be described.

[0212] A light emitting display apparatus according to examples of the present disclosure can include a cover coating disposed on a substrate and including a plurality of protruding portions, a first electrode disposed on the plurality of protruding portions, a light emitting layer disposed on the first electrode, and a second electrode disposed on the light emitting layer, wherein the first electrode can have a profile conforming to a profile of the plurality of protruding portions, and the light emitting layer can have a profile not conforming to the profile of the first electrode.

[0213] A light emitting display apparatus according to examples of the present disclosure can include a substrate including a plurality of pixels having an open area, a cover coating disposed on the substrate and including a plurality of recessed portions disposed in the open area and a boundary portion disposed between adjacent recessed portions, a first electrode disposed on the plurality of recessed portions and the boundary portion, a light emitting layer disposed on the first electrode, and a second electrode disposed on the light emitting layer, wherein the first electrode can have a profile conforming to a profile of the plurality of recessed portions and the boundary portion, and the light emitting layer can have a profile not conforming to the profile of the first electrode.

[0214] A light emitting display apparatus according to examples of the present disclosure can include a substrate including a plurality of pixels having an open area, a cover coating disposed on the substrate and including an uneven portion having a plurality of pointed top portions disposed in the open area, a first electrode disposed on the uneven portion, a light emitting layer disposed on the first electrode, and a second electrode disposed on the light emitting layer, wherein the first electrode can have a profile conforming to a profile of the uneven portion, and the light emitting layer can have a profile not conforming to the profile of the first electrode.

[0215] In examples of the present disclosure, the second electrode can have a profile conforming to a profile of the light emitting layer.

[0216] In examples of the present disclosure, each of the plurality of protruding portions can include a top portion having a pointed structure, and an aspect ratio with respect to a total height between the bottom portion and the top portion at a half height from the bottom portion is in a range of 0.35 to 0.6.

[0217] In examples of the present disclosure, each of the plurality of protruding portions can have an aspect ratio of 0.35 to 0.65 and a half height aspect ratio of 0.45 to 0.7 at a half height from the bottom portion.

[0218] In examples of the present disclosure, each of the plurality of protruding portions can include a top portion having a pointed structure, a curved portion disposed between the top portion and the bottom portion.

[0219] In examples of the disclosure, the curved portion of each of the plurality of protruding portions can include a first tangent slope at a half height from the bottom portion and a second tangent slope at 4 / 5 of the total height between the bottom portion and the top portion of the protruding portion with respect to the total height of the protruding portion.

[0220] In examples of the disclosure, the curved portion of each of the plurality of protruding portions can have a maximum tangent slope between the position of the half height and the top portion of the protruding portion.

[0221] In examples of the disclosure, the curved portion of each of the plurality of protruding portions can have a maximum tangent slope at 4 / 5 of the total height from the bottom portion with respect to the total height between the bottom portion and the top portion of the protruding portion.

[0222] In examples of the disclosure, the thickness of the light emitting layer can gradually increase toward the bottom portion of each of the plurality of protruding portions.

[0223] In examples of the disclosure, the light emitting layer can include an effective emission region overlapping an upper region of each of the plurality of protruding portions and a non-effective emission region overlapping a lower region of the protruding portion with respect to the bottom portion of each of the plurality of protruding portions.

[0224] In examples of the disclosure, the light emitting layer can include a raised portion overlapping the top portion of each of the plurality of protruding portions, and the raised portion can have a convex curved shape to overlap the top portion of the corresponding protruding portion.

[0225] In examples of the disclosure, the light emitting layer can include a raised portion overlapping the top portion of each of the plurality of protruding portions, and the raised portion can have a dome structure having an inflection point portion.

[0226] In examples of the disclosure, the light emitting layer can include a raised portion overlapping the top portion of each of the plurality of protruding portions, and the raised portion can be formed to have a non-conformal shape with respect to the sharp top portion of each of the plurality of protruding portions.

[0227] In examples of the disclosure, the light emitting layer can include a raised portion overlapping the top portion of each of the plurality of protruding portions, and the raised portion can be formed to function as a concave lens that reflects incident light emitted from an effective light emitting region of the light emitting layer toward the substrate.

[0228] In examples of the disclosure, the first electrode can be formed in a conformal shape with respect to the plurality of protruding portions, and the light emitting layer can be formed in a non-conformal shape with respect to the first electrode.

[0229] A light emitting display device according to an example of the disclosure can include a cover coating disposed on a substrate and including a plurality of protruding portions, a first electrode disposed on the plurality of protruding portions, a light emitting layer disposed on the first electrode, and a second electrode disposed on the light emitting layer, wherein each of the plurality of protruding portions can have an aspect ratio of a half height at a half height of a total height from a bottom portion to a top portion in a range of 0.45 to 0.7, and an aspect ratio at a 4 / 5 height of the total height from the bottom portion in a range of 0.35 to 0.6.

[0230] In an example of the disclosure, an aspect ratio of each of the plurality of protruding portions can be in a range of 0.35 to 0.65.

[0231] A light emitting display device according to an example of the disclosure can include a cover coating disposed on a substrate and including an uneven portion having a plurality of protruding portions, a first electrode disposed on the uneven portion, a light emitting layer disposed on the first electrode, and a second electrode disposed on the light emitting layer, wherein a surface area increase rate of the uneven portion with respect to a unit area is in a range of 1.05 to 2.0 inclusive.

[0232] In an example of the disclosure, a surface area increase rate of the second electrode with respect to a unit area is lower than a surface area increase rate of the uneven portion.

[0233] In an example of the disclosure, the uneven portion can have a surface area increase rate in a range of 1.3 to 1.43 inclusive with respect to a unit area.

[0234] In an example of the disclosure, an aspect ratio of a half height at a half height of a total height from a bottom portion to a top portion in each of the plurality of protruding portions can be in a range of 0.45 to 0.6 inclusive, and an aspect ratio at a 4 / 5 height of the total height from the bottom portion can be in a range of 0.45 to 0.6 inclusive.

[0235] In an example of the disclosure, an aspect ratio of each of the plurality of protruding portions can be in a range of 0.35 to 0.48 inclusive.

[0236] In an example of the disclosure, each of the plurality of protruding portions can include a top portion having a pointed top structure and a curved portion disposed between the top portion and a bottom portion, the curved portion of each of the plurality of protruding portions can include a first tangent slope at a half height of a total height from the bottom portion and a second tangent slope at a 4 / 5 height of the total height from the bottom portion to the top portion with respect to the total height between the bottom portion and the top portion of the protruding portion, and the second tangent slope can be greater than the first tangent slope.

[0237] In examples of the disclosure, the second tangent slope can gradually increase from a position at half of the total height from the bottom portion toward the top portion.

[0238] In examples of the disclosure, the light emitting layer can include a raised portion overlapping the top portion of each of the plurality of protruding portions, and the raised portion can include a dome structure having an inflection portion.

[0239] In examples of the disclosure, the light emitting layer can further include a bank layer defining an open area formed to have a two-dimensional size smaller than a two-dimensional size of the uneven portion.

[0240] A light emitting display device according to examples of the disclosure can include a substrate including a plurality of pixels having an open area, a cover coating layer disposed on the substrate and including an uneven portion having a plurality of sharp top portions disposed in the open area, a first electrode disposed on the uneven portion, a light emitting layer disposed on the first electrode, and a second electrode disposed on the light emitting layer, wherein the first electrode can be formed in a conformal shape with respect to the uneven portion, and the light emitting layer can be formed in a non-conformal shape with respect to the first electrode.

[0241] In examples of the disclosure, the light emitting layer can include a raised portion overlapping the sharp top portion of the uneven portion, and the raised portion can have a convex curved shape to overlap the sharp top portion.

[0242] In examples of the disclosure, the sharp top portion disposed in the open area can have a honeycomb structure in two dimensions.

[0243] In examples of the disclosure, the uneven portion can have a surface area increase rate of 1.05 to 2.0 with respect to a unit area.

[0244] In examples of the disclosure, the second electrode can be formed in a conformal shape with respect to the light emitting layer, and the second electrode can have a surface area increase rate lower than a surface area increase rate of the uneven portion with respect to a unit area.

[0245] In examples of the disclosure, the uneven portion can have a surface area increase rate of 1.3 to 1.43 with respect to a unit area.

[0246] In examples of the disclosure, the light emitting layer can include a raised portion overlapping the sharp top portion of the uneven portion, and the raised portion can have a convex curved shape to overlap the sharp top portion.

[0247] In examples of the disclosure, the light-emitting layer can include a raised portion overlapping a tip portion of the uneven portion, and the raised portion can have a convex curved shape to overlap the tip portion. A light-emitting display device according to examples of the disclosure can include a cover coating layer located on a substrate and including a plurality of protruding portions, a first electrode located on the plurality of protruding portions, a light-emitting layer located on the first electrode, and a second electrode located on the light-emitting layer, wherein an aspect ratio of one-half of a total height between a top portion and a bottom portion of each of the plurality of protruding portions at a half height from the bottom portion is in a range of 0.45 to 0.7, and an aspect ratio at a 4 / 5 height of the total height from the bottom portion is in a range of 0.35 to 0.6.

[0248] A light-emitting display device according to examples of the disclosure can include a substrate including a plurality of pixels having an open area, a cover coating layer located on the substrate and including a plurality of recessed portions within the open area and a boundary portion between adjacent recessed portions, a first electrode located on the plurality of recessed portions and the boundary portion, a light-emitting layer located on the first electrode, and a second electrode located on the light-emitting layer, wherein the first electrode has a profile conforming to a profile of the plurality of recessed portions and the boundary portion, and the light-emitting layer has a profile not conforming to the profile of the first electrode.

[0249] The above-described features, structures, and effects of the disclosure are included in at least one embodiment of the disclosure, but are not limited to only one embodiment. In addition, the features, structures, and effects described in at least one embodiment of the disclosure can be implemented by those skilled in the art by combining or modifying other embodiments. Therefore, what is associated with the combination and modification should be interpreted as being within the scope of the disclosure.

[0250] It will be apparent to those skilled in the art that various modifications and variations can be made in the present disclosure without departing from the spirit or scope of the disclosure. Thus, it is intended that the present disclosure cover the modifications and variations of this disclosure provided they come within the scope of the appended claims and their equivalents.

[0251] The above-described various embodiments can be combined to provide additional embodiments.

[0252] These and other changes can be made to the embodiments in light of the above detailed description. In general, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments, in one embodiment, the usage of the terms "include", "includes", "including", "has", "have", "having", or variations thereof are intended to be equivalent to the term "comprise", "comprises", "comprising", "contains", "contain", "containing", or variations thereof, such that the features, structures, or characteristics identified during the specification can include, but are not limited to, those identified in this summary. Therefore, the claims are not limited to the specific embodiments described in this disclosure and their equivalents.

Claims

1. A light-emitting display device, comprising: substrate; a covering coating disposed on the substrate, the covering coating comprising a plurality of protruding portions; a first electrode located on the plurality of protrusions; a light-emitting layer, the light-emitting layer being located on the first electrode; and a second electrode, the second electrode being located on the light-emitting layer; wherein each of the plurality of protruding portions comprises: bottom part; a top portion positioned above the bottom portion; and a curved portion, the curved portion being located between the top portion and the bottom portion, wherein the curved portion of each of the plurality of protruding portions includes a first tangent slope at half the total height from the bottom portion to the top portion and a second tangent slope at 4 / 5 of the total height, wherein the second tangent slope is greater than the first tangent slope, and wherein an aspect ratio of 4 / 5 of the height at 4 / 5 of the total height from the bottom portion to the top portion is within a range of 0.35 to 0.6 inclusive; The aspect ratio of the 4 / 5 height is defined as (4H / 5) / (F′ / 2), where H is the total height and F′ is the width of the protruding portion at 4 / 5 of the total height.

2. The light-emitting display device according to claim 1, wherein Each of the plurality of protruding portions has an aspect ratio of 0.35 to 0.65, the aspect ratio being defined as H / (D / 2), where D is a diameter of the protruding portion at the bottom portion.

3. The light-emitting display device according to claim 1, wherein Each of the plurality of protrusions has an aspect ratio at half height in the range of 0.45 to 0.7, inclusive, at half height of the total height from the bottom portion to the top portion, and the aspect ratio at half height is defined as (H / 2) / (F / 2), where F is the width of the protrusion at 1 / 2 of the total height.

4. The light-emitting display device according to claim 1, wherein: Each of the plurality of protruding portions has an aspect ratio of 0.35 to 0.65, the aspect ratio being defined as H / (D / 2), and wherein each of the plurality of protrusions has an aspect ratio at half height in the range of 0.45 to 0.7, inclusive, at half height of the total height from the bottom portion to the top portion, wherein the aspect ratio at half height is defined as (H / 2) / (F / 2), wherein F is the width of the protrusion at 1 / 2 of the total height.

5. The light-emitting display device according to any one of claims 1 to 4, wherein: The top portion of each of the plurality of protruding portions has a sharp structure.

6. The light-emitting display device according to any one of claims 1 to 4, wherein: The curved portion of each of the plurality of protruding portions has a maximum tangent slope between a position of half height and the top portion of the protruding portion.

7. The light-emitting display device according to any one of claims 1 to 4, wherein: The curved portion of each of the plurality of protruding portions has a maximum tangent slope at 4 / 5 of the total height from the bottom portion to the top portion of the protruding portion.

8. The light-emitting display device according to any one of claims 1 to 4, wherein: The thickness of the light emitting layer gradually increases toward the bottom portion of each of the plurality of protruding portions.

9. The light-emitting display device according to any one of claims 1 to 4, wherein: The light emitting layer includes an effective emission region overlapping an upper region of each of the plurality of protrusions and a non-effective emission region overlapping a lower region of each of the plurality of protrusions.

10. The light-emitting display device according to any one of claims 1 to 4, wherein: The light emitting layer includes a raised protruding portion overlapping the top portion of each of the plurality of protruding portions and a bent portion between the plurality of raised protruding portions.

11. The light-emitting display device according to claim 10, wherein: The raised protruding portion of the light emitting layer includes a raised portion overlapping the top portion of each of the plurality of protruding portions, and The raised portion may have a convex curved shape to cover the top portion of the corresponding protruding portion, or may have a dome structure having an inflection point portion.

12. The light-emitting display device according to claim 10, wherein: The raised protruding portion of the light emitting layer includes a raised portion overlapping the top portion of each of the plurality of protruding portions, wherein the top portion of each of the plurality of protruding portions has a sharp structure, and Wherein, the raised portion is formed to have a non-conformal shape relative to the sharp structure.

13. The light-emitting display device according to claim 10, wherein: The raised protruding portion of the light emitting layer includes a raised portion overlapping the top portion of each of the plurality of protruding portions, and The raised portion is formed to function as a concave lens that reflects light emitted from and incident on an effective emission region of the light emitting layer toward the substrate.

14. The light-emitting display device according to any one of claims 1 to 4, wherein: The light emitting display device further includes a bank layer located on an edge of the first electrode and the cover coating; wherein the cover coating further comprises a flat surface overlapping the bank layer, The end of the bank layer is located between the flat surface of the cover coating layer and a bottom portion of an outermost protrusion among the plurality of protrusions.

15. The light-emitting display device according to any one of claims 1 to 4, wherein: The surface area increase rate of the plurality of protrusions relative to a unit area is 1.05 to 2.

0.

16. The light-emitting display device according to any one of claims 1 to 4, wherein: The plurality of protruding portions form a honeycomb structure two-dimensionally.

17. The light-emitting display device according to any one of claims 1 to 4, in, The cover coating further includes a plurality of concave portions disposed between the plurality of protruding portions, and One of the plurality of concave portions is surrounded by a plurality of protruding portions adjacent thereto.

18. The light-emitting display device according to claim 17, wherein: A plurality of protruding portions surrounding one concave portion are arranged in a hexagonal shape.

19. The light-emitting display device according to claim 18, wherein: In a plan view, the centers of three adjacent concave portions form a triangle, and the centers of six concave portions surrounding one concave portion form a hexagonal shape.

20. The light-emitting display device according to claim 18, wherein The centers of the concave portions adjacent to each other in one direction are arranged in a straight line.

21. A light-emitting display device, comprising: a substrate comprising a plurality of pixels having an opening area; a cover coating layer on the substrate and including an uneven portion having a plurality of protrusions within the opening region; a first electrode located on the uneven portion; a light-emitting layer, the light-emitting layer being located on the first electrode; as well as a second electrode, the second electrode being located on the light-emitting layer, wherein the first electrode is formed into a conformal shape relative to the uneven portion of the cover coating; wherein the light emitting layer is formed in a non-conformal shape relative to the first electrode, and wherein each of the plurality of protruding portions includes a curved portion having a first tangent slope at half the total height and a second tangent slope at 4 / 5 of the total height, wherein the second tangent slope is greater than the first tangent slope, and The aspect ratio of 4 / 5 height at 4 / 5 of the total height is within the range of 0.35 to 0.6 inclusive.

22. The light-emitting display device according to claim 21, wherein: The curved portion of each of the plurality of protruding portions has a maximum tangent slope at 4 / 5 of the total height.

23. The light-emitting display device according to claim 21, wherein The thickness of the light emitting layer gradually increases toward a bottom portion of each of the plurality of protruding portions.

24. The light-emitting display device according to claim 21, wherein: An aspect ratio at half height at half height of a total height from a bottom portion to a top portion of each of the plurality of protruding portions is within a range of 0.45 to 0.7 inclusive.

25. The light-emitting display device according to claim 24, wherein: An aspect ratio of each of the plurality of protruding portions is within a range of 0.35 to 0.65, inclusive.

26. The light-emitting display device according to claim 21, wherein The second electrode has a contour that conforms to a contour of the light emitting layer.

27. The light-emitting display device according to claim 21, wherein The surface area increase rate of the second electrode is lower than the surface area increase rate of the uneven portion with respect to a unit area.

28. The light-emitting display device according to any one of claims 21 to 27, wherein: The light emitting layer includes an effective emission region overlapping an upper region of each of the plurality of protrusions and a non-effective emission region overlapping a lower region of each of the plurality of protrusions.

29. The light-emitting display device according to any one of claims 21 to 27, wherein: The light emitting layer includes a raised protruding portion overlapping a top portion of each of the plurality of protruding portions and a bent portion between the plurality of raised protruding portions.

30. The light-emitting display device according to claim 29, wherein: The raised protruding portion of the light emitting layer includes a raised portion overlapping the top portion of each of the plurality of protruding portions, and The raised portion may have a convex curved shape to cover the top portion of the corresponding protruding portion, or may have a dome structure having an inflection point portion.

31. The light-emitting display device according to claim 29, wherein The raised protruding portion of the light emitting layer includes a raised portion overlapping the top portion of each of the plurality of protruding portions, wherein the top portion of each of the plurality of protruding portions has a sharp structure, and Wherein, the raised portion is formed to have a non-conformal shape relative to the sharp structure.

32. The light-emitting display device according to claim 29, wherein: The raised protruding portion of the light emitting layer includes a raised portion overlapping the top portion of each of the plurality of protruding portions, and The raised portion is formed to function as a concave lens that reflects light emitted from and incident on an effective emission region of the light emitting layer toward the substrate.

33. The light-emitting display device according to any one of claims 21 to 27, wherein: The light emitting display device further includes a bank layer located on an edge of the first electrode and the cover coating; wherein the cover coating further comprises a flat surface overlapping the bank layer, The end of the bank layer is located between the flat surface of the cover coating layer and a bottom portion of an outermost protrusion among the plurality of protrusions.

34. The light-emitting display device according to any one of claims 21 to 27, wherein: The surface area increase rate of the plurality of protrusions relative to a unit area is 1.05 to 2.

0.

35. The light-emitting display device according to any one of claims 21 to 27, wherein: The plurality of protruding portions form a honeycomb structure two-dimensionally.

36. The light-emitting display device according to any one of claims 21 to 27, in, The uneven portion further includes a plurality of concave portions arranged between the plurality of protruding portions, and One of the plurality of concave portions is surrounded by a plurality of protruding portions adjacent thereto.

37. The light-emitting display device according to claim 36, wherein: A plurality of protruding portions surrounding one concave portion are arranged in a hexagonal shape.

38. The light-emitting display device according to claim 37, wherein: In a plan view, the centers of three adjacent concave portions form a triangle, and the centers of six concave portions surrounding one concave portion form a hexagonal shape.

39. The light-emitting display device according to claim 37, wherein: The centers of the concave portions adjacent to each other in one direction are arranged in a straight line.

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