Organic light emitting display device

Abstract

An organic light-emitting display device comprises: a substrate; an organic light-emitting diode pixel located in a display area of ​​the organic light-emitting display device; a first inclined structure surrounding the pixel; a second inclined structure at least partially surrounding the first inclined structure; and a planarization layer covering the first inclined structure and the second inclined structure and having a refractive index greater than that of the first inclined structure and greater than that of the second inclined structure, wherein the height of the first inclined structure is greater than the height of the second inclined structure.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] The entirety of Korean Patent Application No. 10-2018-0142511, entitled “ORGANIC LIGHT emitting display device,” filed on November 19, 2018 in the Korean Intellectual Property Office is incorporated herein by reference. Technical Field

[0003] Embodiments relate to an organic light emitting display device. Background Art

[0004] The organic light emitting display device may include an organic light emitting diode including a hole injection electrode, an electron injection electrode, and an organic emission layer therebetween. The organic light emitting display device is a self-luminous display device that emits light when an exciton falls from an excited state to a ground state, and the exciton is generated when holes injected from the hole injection electrode and electrons injected from the electron injection electrode are combined in the organic emission layer.

[0005] Since the organic light emitting display device, which is a self-luminous display device, does not require a separate light source, the organic light emitting display device can be driven at a low voltage and can be constructed into a lightweight and slim profile with high quality characteristics such as a wide viewing angle, a high contrast ratio, and a fast response speed.

[0006] The organic light emitting display device includes a plurality of pixels that respectively emit light of different colors, and the plurality of pixels emit light, thereby displaying an image.

[0007] Here, a pixel refers to the smallest unit configured to display an image. Gate lines and data lines each configured to drive a pixel, power lines such as a driving power line, an insulating layer configured to define an emission area or a pixel defining layer of each pixel shape, etc. may be positioned between adjacent pixels. Summary of the invention

[0008] The present disclosure is directed to providing an organic light emitting display device having improved front light efficiency and simultaneously having excellent side visibility.

[0009] An embodiment can be implemented by providing an organic light-emitting display device, which includes: a substrate; an organic light-emitting diode pixel located in a display area of ​​the organic light-emitting display device; a first inclined structure surrounding the pixel; a second inclined structure at least partially surrounding the first inclined structure; and a planarization layer covering the first inclined structure and the second inclined structure and having a refractive index greater than that of the first inclined structure and greater than that of the second inclined structure, wherein the height of the first inclined structure is greater than the height of the second inclined structure.

[0010] A width of a wall of the first inclined structure may be greater than a width of a wall of the second inclined structure.

[0011] The height of the first inclined structure may be 1.2 times or more the height of the second inclined structure.

[0012] The height of the first inclined structure may be 2.5 μm or greater.

[0013] A horizontal separation distance between an edge of the pixel and an inner edge of the first inclined structure along a top surface of the substrate may be about 0.5 μm to about 1.5 μm.

[0014] The organic light emitting display device may further include a third inclined structure at least partially surrounding the second inclined structure, wherein the height of the second inclined structure is substantially the same as the height of the third inclined structure.

[0015] The organic light emitting display device may further include a third inclined structure at least partially surrounding the second inclined structure, wherein the height of the second inclined structure is greater than the height of the third inclined structure.

[0016] The first inclined structure may have a closed loop shape, and the second inclined structure may have a closed loop shape.

[0017] The cross-sectional shape of the first inclined structure may have a conical inclination, and the angle θ of the inclination may satisfy the following formula:

[0018]

[0019] Among them, n 1 is the refractive index of the first tilted structure, n 2 is the refractive index of the planarization layer.

[0020] The organic light-emitting display device may further include a thin film encapsulation layer covering the organic light-emitting diode on the substrate, the thin film encapsulation layer including a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer, wherein the first inclined structure and the second inclined structure are located on the thin film encapsulation layer.

[0021] The organic light-emitting display device may further include a dam in a peripheral region of the organic light-emitting display device surrounding the display region, wherein the first inorganic encapsulating layer and the second inorganic encapsulating layer directly contact each other outside the dam.

[0022] The organic light-emitting display device may further include: a thin film encapsulation layer covering the organic light-emitting diode on the substrate, the thin film encapsulation layer including a first inorganic encapsulation layer, an organic encapsulation layer and a second inorganic encapsulation layer; and a touch screen layer located on the thin film encapsulation layer, wherein the first inclined structure and the second inclined structure are located on the touch screen layer.

[0023] An embodiment can be implemented by providing an organic light-emitting display device, which includes: a substrate; an organic light-emitting diode located in a display area of ​​the organic light-emitting display device, the organic light-emitting diode including a pixel electrode, an intermediate layer and a relative electrode; a pixel defining layer covering an edge of the pixel electrode and defining an emission area by an opening exposing a central portion of the pixel electrode; a thin film encapsulation layer covering the organic light-emitting diode and including at least one organic encapsulation layer and at least one inorganic encapsulation layer; a plurality of inclined structures located on the thin film encapsulation layer and at least partially surrounding the opening; and a planarization layer covering the plurality of inclined structures, wherein a first inclined structure of the plurality of inclined structures that is closest to the emission area has a height greater than heights of other inclined structures of the plurality of inclined structures.

[0024] The plurality of inclined structures may include a second inclined structure surrounding the first inclined structure, and the height of the first inclined structure may be 1.2 times or more of a height of the second inclined structure.

[0025] A refractive index of each of the plurality of inclined structures may be about 1.4 to about 1.55, and a refractive index of the planarization layer may be about 1.6 to about 1.85.

[0026] A horizontal separation distance between an edge of the opening and an inner edge of the first inclined structure along a top surface of the substrate may be about 0.5 μm to about 1.5 μm.

[0027] Each of the plurality of inclined structures may have a closed loop shape.

[0028] The cross-sectional shape of the first inclined structure may have a conical inclination, and the angle θ of the inclination may satisfy the following formula:

[0029]

[0030] Among them, n 1 is the refractive index of the first tilted structure, n 2 is the refractive index of the planarization layer.

[0031] The organic light-emitting display device may further include a dam in a peripheral area surrounding the display area, wherein the at least one inorganic encapsulation layer includes a first inorganic encapsulation layer and a second inorganic encapsulation layer, and the first inorganic encapsulation layer and the second inorganic encapsulation layer directly contact each other outside the dam.

[0032] The organic light emitting display device may further include a touch screen layer located on the thin film encapsulation layer, wherein the plurality of inclined structures are located on the touch screen layer.

[0033] The plurality of inclined structures may include a second inclined structure at least partially surrounding the first inclined structure, the first inclined structure may have a closed loop shape, and the second inclined structure may have a discontinuous shape including a plurality of second sub-islands spaced apart from each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Features will become apparent to those skilled in the art by describing in detail exemplary embodiments with reference to the accompanying drawings, in which:

[0035] Figure 1 shows a plan view of an organic light emitting display device according to an embodiment;

[0036] Figure 2A and Figure 2B shows that it can be included in Figure 1 An enlarged plan view of an embodiment in area A;

[0037] Figure 3 Shown along Figure 2A and Figure 2B A cross-sectional view taken along line II';

[0038] Figure 4 Shows Figure 3 An enlarged cross-sectional view of region B;

[0039] Figure 5 A cross-sectional view showing a portion of an organic light emitting display device according to another embodiment;

[0040] Figure 6 A graph showing the increase rate of front light efficiency for Case 1 in which the height of the first inclined structure is increased and for Case 2 in which a plurality of inclined structures having the same size are employed is shown;

[0041] Figure 7 A cross-sectional view showing a portion of an organic light emitting display device according to another embodiment; and

[0042] Figure 8 A cross-sectional view illustrating a portion of an organic light emitting display device according to another embodiment is shown. DETAILED DESCRIPTION

[0043] Example embodiments will now be described more fully hereinafter with reference to the accompanying drawings; however, they may 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 exemplary embodiments to those skilled in the art.

[0044] In the accompanying drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. It will also be understood that when a layer or element is referred to as being "on" another layer or element, the layer or element may be directly on the other layer or element, or there may be an intermediate layer. In addition, it will be understood that when an element is referred to as being "below" another element, the element may be directly below the other element, and there may also be one or more intermediate elements. In addition, it will be understood that when an element is referred to as being "between" two elements, the element may be the only element between the two elements, or there may also be one or more intermediate elements. The same reference numerals always refer to the same elements.

[0045] As used herein, the terms "or" and "and / or" include any and all combinations of one or more of the associated listed items. Expressions such as "at least one of...", when following a list of elements, modify the entire list of elements and do not modify the individual elements of the list.

[0046] It will be understood that although the terms "first", "second", etc. may be used herein to describe various components, these components should not be limited by these terms. These terms are only used to distinguish one component from another.

[0047] As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0048] It will also be understood that the terms “comprise” and / or “include” used herein specify the presence of stated features or components, but do not preclude the presence or addition of one or more other features or components.

[0049] It will be understood that when a layer, region, or component is referred to as being "connected" to another layer, region, or component, the layer, region, or component may be "directly connected" to the other layer, region, or component, or the layer, region, or component may be "indirectly connected" to the other layer, region, or component with other layers, regions, or components arranged therebetween. For example, it will be understood that when a layer, region, or component is referred to as being "connected or electrically connected" to another layer, region, or component, the layer, region, or component may be "directly electrically connected" to the other layer, region, or component, or may be "indirectly connected or electrically connected" to the other layer, region, or component with other layers, regions, or components arranged therebetween.

[0050] Figure 1 A plan view of an organic light emitting display device according to an embodiment is shown.

[0051] refer to Figure 1 , the substrate 100 of the organic light emitting display device may be divided into a display area DA and a peripheral area PA surrounding the display area DA. For example, the organic light emitting display device may include the substrate 100 and may have a display area DA and a peripheral area PA. The organic light emitting display device may provide a predetermined image by using light emitted from a plurality of pixels P arranged in its display area DA.

[0052] Each pixel P may include an organic light emitting diode and emit, for example, red light, green light, blue light or white light. For example, each pixel P may be connected to a pixel circuit including a thin film transistor TFT and a capacitor. The pixel circuit may be connected to a scan line SL, a data line DL intersecting the scan line SL, and a drive voltage line PL.

[0053] When the pixel circuit is driven, each pixel P may emit light, and the display area DA may provide a predetermined image by using the light emitted from the pixel P. In this specification, the pixel P may be defined as an emission area configured to emit red, green, blue, or white light as described above.

[0054] The peripheral area PA is an area in which no pixels P are arranged, and therefore no image is provided. A built-in driving circuit unit, a power line, and a terminal unit configured to drive the pixels P may be arranged in the peripheral area PA of the organic light-emitting display device, wherein a printed circuit board or a driver integrated circuit (IC) including the driving circuit unit is connected to the terminal unit.

[0055] Figure 2A and Figure 2B shows that it can be included in Figure 1 FIG. 1 is an enlarged plan view of some configurations of the embodiment in region A, and shows the arrangement relationship of pixels and inclined structures surrounding the pixels.

[0056] refer to Figure 2Aand Figure 2B , the organic light emitting display device includes at least one pixel P, and may include a plurality of inclined structures 510a, 510b, and 510c at least partially surrounding one pixel P (eg, an emission region of the pixel P). Figure 2A As shown, the plurality of inclined structures 510a, 510b and 510c may include three inclined structures. In an embodiment, the plurality of inclined structures may be two or more inclined structures. In an embodiment, the number of inclined structures may be variously modified.

[0057] A plurality of inclined structures 510a, 510b, and 510c may include a first inclined structure 510a, a second inclined structure 510b, and a third inclined structure 510c. In an embodiment, the first inclined structure 510a may have a closed shape (e.g., a continuous ring shape or a closed loop shape) that is separated from the pixel P (e.g., the emission area of ​​the pixel P) and surrounds the pixel P. In an embodiment, the second inclined structure 510b may have a closed loop shape that is separated from the first inclined structure 510a and surrounds the first inclined structure 510a (e.g., the outside of the first inclined structure 510a). In an embodiment, the third inclined structure 510c may have a closed loop shape that is separated from the second inclined structure 510b and surrounds the second inclined structure 510b (e.g., the outside of the second inclined structure 510b). In an embodiment, the first inclined structure 510a, the second inclined structure 510b, and the third inclined structure 510c may have, for example, a chamfered quadrilateral ring or an octagonal ring.

[0058] In an embodiment, at least one of the first inclined structure 510a, the second inclined structure 510b, and the third inclined structure 510c may have an open shape in which at least a portion thereof is disconnected, rather than a closed loop shape.

[0059] Figure 2B Some embodiments of the first, second, and third inclined structures 510a, 510b, and 510c are shown, and some of the first, second, and third inclined structures 510a, 510b, and 510c have an open shape.

[0060] refer to Figure 2B , the first inclined structure 510a may surround the pixel P in a closed loop shape, and the second and third inclined structures 510b and 510c may have shapes in which a portion thereof is disconnected (eg, a discontinuous shape, a dotted line shape, or an open shape).

[0061] exist Figure 2B, the second inclined structures 510b may be a group of a plurality of second sub-islands 510bs spaced apart from each other and surrounding the first inclined structures 510a. The third inclined structures 510c may be a group of a plurality of third sub-islands 510cs spaced apart from each other and surrounding the second inclined structures 510b.

[0062] The number, shape, separation distance, separation position, etc. of the second sub-islands 510bs and the third sub-islands 510cs may be variously modified.

[0063] The first, second, and third inclined structures 510 a , 510 b , and 510 c may be configured to reflect light emitted from the pixel P, and may help improve front light efficiency and side visibility.

[0064] In an embodiment, the width W1 (e.g., of the wall) of the first inclined structure 510a (e.g., in a radial direction extending outward from the pixel P) may be greater than the width W2 (e.g., of the wall) of the second inclined structure 510b and the width W3 (e.g., of the wall) of the third inclined structure 510c. A detailed description of the first inclined structure 510a, the second inclined structure 510b, and the third inclined structure 510c is provided below.

[0065] In the implementation scheme, Figure 2A and Figure 2B As shown, three inclined structures, ie, a first inclined structure 510a, a second inclined structure 510b, and a third inclined structure 510c, may surround a pixel P. In an embodiment, two or more inclined structures may be provided surrounding one pixel P. The number of inclined structures may be variously modified.

[0066] In an embodiment, the pixel P may have a shape such as a circle, an ellipse or a polygon. For example, the pixel P may have a quadrilateral shape. In an embodiment, the polygon or quadrilateral includes a chamfered shape (e.g., a vertex or corner with a chamfer). For example, the pixel P may have a quadrilateral shape with a chamfered corner. In an embodiment, the pixel P may be provided as a plurality of pixels, and each pixel P may be surrounded by a plurality of tilted structures (e.g., a first tilted structure 510a, a second tilted structure 510b, and a third tilted structure 510c).

[0067] In an embodiment, the plurality of pixels P may include a first pixel and a second pixel, and the number of inclined structures surrounding the first pixel (e.g., the first inclined structure 510a, the second inclined structure 510b, and the third inclined structure 510c) and the number of inclined structures surrounding the second pixel (e.g., the first inclined structure 510a, the second inclined structure 510b, and the third inclined structure 510c) may be different from each other.

[0068] The plurality of pixels P may be arranged in various arrangements such as a honeycomb structure and a stripe structure.

[0069] In the following, according to Figure 3 The stacking order shown in hereinafter specifically describes the organic light emitting display device according to the embodiment.

[0070] Figure 3 Shown along Figure 2A and Figure 2B A cross-sectional view taken along line II'. Figure 4 Shows Figure 3 An enlarged cross-sectional view of region B.

[0071] refer to Figure 3 The organic light emitting display device according to the present embodiment may include a pixel P implemented as an organic light emitting diode OLED. The organic light emitting display device may include a thin film encapsulation layer 400 covering the organic light emitting diode OLED, a first inclined structure 510a, a second inclined structure 510b, and a third inclined structure 510c located on the thin film encapsulation layer 400, and a planarization layer 530 covering the plurality of inclined structures 510a, 510b, and 510c and having a refractive index greater than that of the plurality of inclined structures 510a, 510b, and 510c.

[0072] The plurality of inclined structures 510a, 510b, and 510c may surround an emission region of one pixel P. The plurality of inclined structures 510a, 510b, and 510c may include a first inclined structure 510a, a second inclined structure 510b, and a third inclined structure 510c.

[0073] In the present embodiment, the height H1 of the first inclined structure 510a most adjacent to (e.g., closest to or nearest to) the pixel P among the plurality of inclined structures 510a, 510b, and 510c surrounding one pixel P may be greater than the heights H2 and H3 of other inclined structures such as the second inclined structure 510b and the third inclined structure 510c (e.g., far away from the pixel P). For example, the heights H1, H2, and H3 of the plurality of inclined structures 510a, 510b, and 510c may be measured relative to the surface of the thin film encapsulation layer 400 in a direction orthogonal to the surface of the thin film encapsulation layer 400.

[0074] In the embodiment, as shown, one thin film transistor T1 and a storage capacitor Cst configured to drive a pixel circuit of an organic light emitting diode OLED may be provided. In the embodiment, the number of thin film transistors may be 2 to 7, and various modifications may be made.

[0075] The substrate 100 may include a glass material, a ceramic material, a metal material, or a flexible or bendable material. When the substrate 100 is flexible or bendable, the substrate 100 may include a polymer resin, such as polyethersulfone (PES), polyacrylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyarylate, polyimide (PI), polycarbonate (PC) or cellulose acetate propionate (CAP). The substrate 100 may have a single layer or multilayer structure including the above materials. When the substrate 100 has a multilayer structure, the substrate 100 may also include an inorganic layer. In an embodiment, the substrate 100 may have a structure of an organic material / inorganic material / organic material.

[0076] The buffer layer 111 may be located on the substrate 100, and may help reduce or prevent penetration of foreign matter, moisture, or external air from below the substrate 100, and provide a flat surface on the substrate 100. The buffer layer 111 may include an inorganic material, such as an oxide or a nitride, or an organic material, or an organic / inorganic composite material, and have a single-layer or multi-layer structure including an inorganic material and an organic material.

[0077] A barrier layer may be further disposed between the substrate 100 and the buffer layer 111. The barrier layer may help prevent or minimize impurities from penetrating into the semiconductor layer A1 from the substrate 100. The barrier layer may include an inorganic material, such as an oxide or a nitride, or an organic material, or an organic / inorganic composite material, and have a single-layer or multi-layer structure including an inorganic material and an organic material.

[0078] The semiconductor layer A1 may be arranged on the buffer layer 111. The semiconductor layer A1 may include amorphous silicon or polycrystalline silicon. In the embodiment, the semiconductor layer A1 may include an oxide of at least one of In, Ga, Sn, Zr, V, Hf, Cd, Ge, Cr, Ti, Al, Cs, Ce, and Zn. In the embodiment, the semiconductor layer A1 may include Zn oxide, In-Zn oxide, and Ga-In-Zn oxide as a material based on Zn oxide. In the embodiment, the semiconductor layer A1 may include a semiconductor including IGZO (In-Ga-Zn-O), ITZO (In-Sn-Zn-O), or IGTZO (In-Ga-Sn-Zn-O) containing a metal such as In, Ga, or Sn. The semiconductor layer A1 may include a channel region and a source region and a drain region respectively arranged on two opposite sides of the channel region. The semiconductor layer A1 may include a single layer or multiple layers.

[0079] The gate electrode G1 may be located on the semiconductor layer A1 with the first gate insulating layer 112 disposed therebetween, so that the gate electrode G1 overlaps at least a portion of the semiconductor layer A1. The gate electrode G1 may include at least one of Mo, Al, Cu, and Ti, and may include a single layer or multiple layers. For example, the gate electrode G1 may include a single layer including Mo.

[0080] The first gate insulating layer 112 may include SiO 2 、SiN X 、SiON、Al 2 O 3 、TiO 2 、 2 O 5 , HfO 2 or ZnO 2 .

[0081] The second gate insulating layer 113 may be provided to cover the gate electrode G1. The second gate insulating layer 113 may include SiO 2 、SiN X 、SiON、Al 2 O 3 、TiO 2 、 2 O 5 , HfO 2 or ZnO 2 .

[0082] The first electrode CE1 of the storage capacitor Cst may overlap with the thin film transistor T1. For example, the gate electrode G1 of the thin film transistor T1 may serve as the first electrode CE1 of the storage capacitor Cst.

[0083] The second electrode CE2 of the storage capacitor Cst overlaps the first electrode CE1 and the second gate insulating layer 113 is arranged between them. In this case, the second gate insulating layer 113 can be used as a dielectric layer of the storage capacitor Cst. The second electrode CE2 may include a conductive material including at least one of Mo, Al, Cu, and Ti, and include a single layer or multiple layers including the above materials. For example, the second electrode CE2 may include a single layer of Mo or a multilayer of Mo / Al / Mo.

[0084] In an embodiment, as shown in the figure, the storage capacitor Cst may overlap with the thin film transistor T1. In an embodiment, the storage capacitor Cst may not overlap with the thin film transistor T1, and various modifications may be made.

[0085] The interlayer insulating layer 115 may cover the second electrode CE2 of the storage capacitor Cst. The interlayer insulating layer 115 may include SiO 2 、SiN X、SiON、Al 2 O 3 、TiO 2 、 2 O 5 , HfO 2 or ZnO 2 .

[0086] The source electrode S1 and the drain electrode D1 may be located on the interlayer insulating layer 115. The source electrode S1 and the drain electrode D1 may include a conductive material including at least one of Mo, Al, Cu, and Ti, and include a single layer or a multilayer including the above materials. For example, each of the source electrode S1 and the drain electrode D1 may have a multilayer structure of Ti / Al / Ti.

[0087] The via layer 117 may be located on the source electrode S1 and the drain electrode D1 , and the organic light emitting diode OLED may be positioned on the via layer 117 .

[0088] The path layer 117 may have a flat top surface so that the pixel electrode 310 is formed to be flat. The path layer 117 may include a single layer or multiple layers including an organic material. The path layer 117 may include a general polymer such as benzocyclobutene (BCB), polyimide, hexamethyldisiloxane (HMDSO), polymethylmethacrylate (PMMA), or polystyrene (PS), or a polymer derivative having a phenolic group, an acrylic acid-based polymer, an imide-based polymer, an aryl ether-based polymer, an amide-based polymer, a fluorine-based polymer, a paraxylene-based polymer, a vinyl alcohol-based polymer, or a blend thereof. The path layer 117 may include an inorganic material. The path layer 117 may include SiO 2 、SiN X 、SiON、Al 2 O 3 、TiO 2 、 2 O 5 , HfO 2 or ZnO 2 In the case where the via layer 117 includes an inorganic material, chemical planarization polishing may be performed according to circumstances. Meanwhile, the via layer 117 may include an organic material and an inorganic material.

[0089] The organic light emitting diode OLED may be positioned on the path layer 117 in the display area DA of the substrate 100. The organic light emitting diode OLED may include a pixel electrode 310, an intermediate layer 320 including an organic emission layer, and an opposite electrode 330.

[0090] The via layer 117 includes a through hole exposing one of the source electrode S1 and the drain electrode D1 of the thin film transistor T1 , and the pixel electrode 310 is electrically connected to the thin film transistor T1 by contacting the source electrode S1 or the drain electrode D1 through the through hole.

[0091] The pixel electrode 310 may include a (semi) transparent electrode or a reflective electrode. In an embodiment, the pixel electrode 310 may include a reflective layer and a transparent or semi-transparent electrode layer on the reflective layer, and the reflective layer may include Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr or a compound thereof. The transparent or semi-transparent electrode layer may include indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium oxide (In 2 O 3 ), at least one of indium gallium oxide (IGO) and aluminum zinc oxide (AZO). In the embodiment, the pixel electrode 310 may have a stack structure of ITO / Ag / ITO.

[0092] The pixel defining layer 119 may be located on the path layer 117. The pixel defining layer 119 may define an emission region of the pixel P by including openings OP respectively corresponding to the pixel electrodes 310 in the display area DA, i.e., openings OP respectively exposing at least a central portion of each pixel electrode 310. In addition, the pixel defining layer 119 may prevent arcing, etc., from occurring at the edge of the pixel electrode 310 by increasing a distance between the edge of the pixel electrode 310 and the opposing electrode 330 above the pixel electrode 310. The pixel defining layer 119 may include an organic insulating material such as polyimide, polyamide, acrylic resin, BCB, polyimide, HMDSO, and phenolic resin, and may be formed by spin coating, etc.

[0093] The pixel P (e.g., the emission region of the pixel P) may be defined by the opening OP of the pixel defining layer 119. For example, the edge of the pixel P may indicate the edge of the opening OP of the pixel defining layer 119. In addition, the edge of the opening OP of the pixel defining layer 119 may indicate the boundary of the pixel electrode 310 exposed by the opening OP.

[0094] The intermediate layer 320 of the organic light emitting diode OLED may include an organic emission layer. The organic emission layer may include an organic material, and the organic material includes a fluorescent or phosphorescent material that emits red light, green light, blue light or white light. The organic emission layer may include a low molecular weight or polymer organic material. Functional layers such as a hole transport layer (HTL), a hole injection layer (HIL), an electron transport layer (ETL) and an electron injection layer (EIL) may be selectively further arranged below and on the organic emission layer. In an embodiment, the intermediate layer 320 may correspond to each of the plurality of pixel electrodes 310. The intermediate layer 320 may include (e.g., collectively) a layer that is integrated above the plurality of pixel electrodes 310. Various modifications may be made.

[0095] The counter electrode 330 may include a light-transmitting electrode or a reflective electrode. In an embodiment, the counter electrode 330 may include a transparent or semi-transparent electrode and may include a metal thin film having a small work function and containing Li, Ca, LiF / Ca, LiF / Al, Al, Ag, Mg, and compounds thereof. In addition, a metal such as ITO, IZO, ZnO, or In 2 O 3 A transparent conductive oxide (TCO) layer may be further disposed on the metal film. The opposing electrode 330 may be disposed over the display area DA and the peripheral area PA, and over the intermediate layer 320 and the pixel defining layer 119. The opposing electrode 330 may be integrally disposed over a plurality of organic light emitting diodes OLED, and may correspond to a plurality of pixel electrodes 310.

[0096] In the embodiment, when the pixel electrode 310 includes a reflective electrode and the opposite electrode 330 includes a light-transmitting electrode, light emitted from the intermediate layer 320 may be emitted toward the opposite electrode 330, and the organic light-emitting display device may be a top emission display device. When the pixel electrode 310 includes a transparent or semi-transparent electrode and the opposite electrode 330 includes a reflective electrode, light emitted from the intermediate layer 320 may be emitted toward the substrate 100, and the organic light-emitting display device may be a bottom emission display device. The organic light-emitting display device according to the present embodiment may be a dual emission display device that emits light in both the top direction and the bottom direction.

[0097] The thin film encapsulation layer 400 may help prevent the penetration of external moisture and oxygen by covering the display area DA and the peripheral area PA. The thin film encapsulation layer 400 may include at least one organic encapsulation layer and at least one inorganic encapsulation layer. Figure 3 As shown, the thin film encapsulation layer 400 may include two inorganic encapsulation layers (eg, a first inorganic encapsulation layer 410 and a second inorganic encapsulation layer 430) and one organic encapsulation layer 420. In embodiments, the stacking order and number of layers may vary.

[0098] The first inorganic encapsulation layer 410 may cover the relative electrode 330 and include silicon oxide, silicon nitride and / or silicon oxynitride. In the embodiment, other layers such as a capping layer may be between the first inorganic encapsulation layer 410 and the relative electrode 330. In the embodiment, the first inorganic encapsulation layer 410 may be formed along the structure below it, and its top surface may be uneven. The organic encapsulation layer 420 covers the first inorganic encapsulation layer 410. Unlike the first inorganic encapsulation layer 410, the top surface of the organic encapsulation layer 420 may be approximately flat. For example, the top surface of the organic encapsulation layer 420 corresponding to the display area DA may be approximately flat. The organic encapsulation layer 420 may include at least one of acrylic acid, methacrylic acid, polyester, polyethylene, polypropylene, PET, PEN, PC, PI, polyethylene sulfonate (salt), polyoxymethylene, polyarylate and HMDSO. The second inorganic encapsulation layer 430 may cover the organic encapsulation layer 420 and include silicon oxide, silicon nitride and / or silicon oxynitride.

[0099] As described above, the thin film encapsulation layer 400 may include the first inorganic encapsulation layer 410, the organic encapsulation layer 420, and the second inorganic encapsulation layer 430, and even if cracks occur in the thin film encapsulation layer 400, the cracks that have occurred between the first inorganic encapsulation layer 410 and the organic encapsulation layer 420 and between the organic encapsulation layer 420 and the second inorganic encapsulation layer 430 are not connected to each other through such a multi-layer structure. Thus, the formation of a path through which external moisture or oxygen can penetrate into the display area DA can be prevented or minimized.

[0100] A plurality of inclined structures 510a, 510b, and 510c may be located on the thin film encapsulation layer 400. In an embodiment, when viewed from above, as shown in FIG. Figure 2A Each of the plurality of inclined structures 510 a , 510 b , and 510 c may have a ring shape or a closed loop shape surrounding the pixel P (top view).

[0101] In an embodiment, at least one of the first inclined structure 510a, the second inclined structure 510b, and the third inclined structure 510c may have an open or discontinuous shape instead of a closed loop shape, and thus have a shape in which a portion thereof is disconnected.

[0102] In the implementation scheme, Figure 3 As shown, the cross section of each of the first inclined structure 510a, the second inclined structure 510b, and the third inclined structure 510c may have a shape in which the inner wall thereof is tapered or inclined. For example, the wall thickness (e.g., width) of each of the first inclined structure 510a, the second inclined structure 510b, and the third inclined structure 510c may gradually decrease in a direction away from the substrate 100.

[0103] In an embodiment, a planarization layer 530 may be located on the thin film encapsulation layer 400 to cover the first inclined structure 510a, the second inclined structure 510b, and the third inclined structure 510c. The planarization layer 530 may have a refractive index n greater than that of the first inclined structure 510a, the second inclined structure 510b, and the third inclined structure 510c. 1 The refractive index n 2 , so that light emitted from the organic light emitting diode OLED is reflected or totally reflected by the first inclined structure 510a, the second inclined structure 510b, and the third inclined structure 510c. For example, the relative refractive index of the first inclined structure 510a, the second inclined structure 510b, and the third inclined structure 510c with respect to the planarization layer 530 may be less than 1, and total reflection may occur on the inner inclined surfaces of the first inclined structure 510a, the second inclined structure 510b, and the third inclined structure 510c.

[0104] The first inclined structure 510a, the second inclined structure 510b, and the third inclined structure 510c may each include a material having a refractive index of about 1.4 to about 1.55. For example, the first inclined structure 510a, the second inclined structure 510b, and the third inclined structure 510c may each include an acrylic organic material having a refractive index of about 1.4 to about 1.55. For example, the first inclined structure 510a, the second inclined structure 510b, and the third inclined structure 510c may each include ethylhexyl acrylate, pentafluoropropyl acrylate, poly(ethylene glycol) dimethacrylate, or ethylene glycol dimethacrylate.

[0105] The first, second, and third inclined structures 510 a , 510 b , and 510 c may be formed by coating an organic material having a low refractive index and then performing patterning using a photoresist pattern through a mask process.

[0106] The planarization layer 530 may include a layer having a refractive index n of about 1.6 to about 1.85. 2 For example, the planarization layer 530 may include a material having a refractive index n of about 1.6 to about 1.85. 2 The planarization layer 530 may include an acrylic organic material or a siloxane organic material. For example, the planarization layer 530 may include polydiarylsiloxane, methyltrimethoxysilane, or tetramethoxysilane. In an embodiment, the planarization layer 530 may include dispersed particles for achieving a high refractive index. For example, the planarization layer 530 may include dispersed particles such as ZnO X 、TiO 2 、ZrO 2 and BaTiO 3 The planarization layer 530 may be formed by coating an organic material having a high refractive index using inkjet.

[0107] The angle θ formed by the inner conical inclination (e.g., the inner sidewall or the sidewall facing the pixel P) of the first inclined structure 510a, the second inclined structure 510b, and the third inclined structure 510c and the top surface of the thin film encapsulation layer 400 can be selected so that total reflection of light emitted from the organic light emitting diode OLED can occur. In an embodiment, the angle θ of the inner sidewall of the first inclined structure 510a, the second inclined structure 510b, and the third inclined structure 510c can satisfy the following formula.

[0108]

[0109] In the above formula, n 1 is the refractive index of a corresponding one of the plurality of tilted structures 510a, 510b and 510c, n 2 is the refractive index of the planarization layer 530 .

[0110] In an embodiment, a first angle θ formed by the inner sidewall of the first inclined structure 510a and the top surface of the thin film encapsulation layer 400 is 1 , a second angle θ formed by the inner sidewall of the second inclined structure 510 b and the top surface of the thin film encapsulation layer 400 2 and a third angle θ formed by the inner sidewall of the third inclined structure 510c and the top surface of the thin film encapsulation layer 400 3 can be substantially the same. In an embodiment, the first angle θ 1 , the second angle θ 2 and the third angle θ 3 At least one of may be different. In an embodiment, the first angle θ 1 , the second angle θ 2 and the third angle θ 3 The first angle θ may be the same as or different from each other within the range satisfying the above formula. 1 , the second angle θ 2 and the third angle θ 3 It may have a value of 65° or more.

[0111] In an embodiment, the organic light-emitting display device may include a plurality of first inclined structures 510a, second inclined structures 510b, and third inclined structures 510c relative to or associated with a pixel P, and the path of light emitted to the side (e.g., the side of the pixel P) may be changed within a wider angle range, thereby improving front light efficiency and side visibility.

[0112] In an embodiment, a height H1 of the first inclined structure 510a (eg, most adjacent or neighboring to its corresponding pixel P) among the plurality of first inclined structures 510a, second inclined structures 510b, and third inclined structures 510c surrounding one pixel P may be the largest.

[0113] Reference shows Figure 3 An enlarged view of area B Figure 4 , the height H1 of the first inclined structure 510a may be greater than the height H2 of the second inclined structure 510b and / or the height H3 of the third inclined structure 510c. For example, H1>H2=H3.

[0114] Light LP1 and LP2 emitted to the side can be reflected and emitted by the inner inclined surfaces (e.g., inner side walls) of the multiple inclined structures 510a, 510b and 510c, so it can be considered to increase all heights H1, H2 and H3 of the multiple inclined structures 510a, 510b and 510c to increase the front light efficiency.

[0115] However, the pattern formed using the photoresist can be formed by the process in the plurality of inclined structures 510a, 510b, and 510c, and if all the heights H1, H2, and H3 of the plurality of inclined structures 510a, 510b, and 510c are increased, the widths W1, W2, and W3 of the sidewalls of the plurality of inclined structures 510a, 510b, and 510c or the distances between the sidewalls of the plurality of inclined structures 510a, 510b, and 510c are also increased to ensure a stable process. Therefore, the space in which the plurality of inclined structures 510a, 510b, and 510c are to be arranged may be insufficient, or the separation distance d1 between the first inclined structure 510a and the second inclined structure 510b and the separation distance d2 between the second inclined structure 510b and the third inclined structure 510c may not be ensured.

[0116] In an embodiment, the first inclined structure 510a may be most adjacent to or closest to the emission region of the pixel P, and the density or intensity of the light LP1 reflected by the first inclined structure 510a may be greater than the density or intensity of the light LP2 reflected by the second inclined structure 510b and the third inclined structure 510c. For example, the amount of light LP1 reflected by the first inclined structure 510a may be about 70% of the amount of light reflected by all the plurality of inclined structures 510a, 510b, and 510c.

[0117] This embodiment can help improve the front light efficiency by providing the first inclined structure 510a of the largest size. In the implementation, the second inclined structure 510b and the third inclined structure 510c can be relatively small, and the space in which the second inclined structure 510b and the third inclined structure 510c are arranged can be ensured, so the side visibility can be improved.

[0118] In the present embodiment, the first width W1 as the width of the sidewall of the first inclined structure 510a (e.g., the maximum distance between the sidewalls) may be greater than the second width W2 as the width of the sidewall of the second inclined structure 510b and the third width W3 as the width of the sidewall of the third inclined structure 510c. For example, W1>W2=W3.

[0119] In an embodiment, the values ​​W1, W2 and W3 representing the width of the sidewall can be defined based on the bottom surface of the plurality of inclined structures 510a, 510b and 510c (for example, the width of the plurality of inclined structures 510a, 510b and 510c measured at the position where the plurality of inclined structures 510a, 510b and 510c contact the thin film encapsulation layer 400).

[0120] In an embodiment, the first width W1 as the width of the sidewall of the first inclined structure 510a may be 2.5 μm or more. When the first width W1 is about 2.5 μm, the height H1 of the first inclined structure 510a may be about 2.5 μm to about 3.0 μm. For example, W1:H1=1:1~1.2.

[0121] In an embodiment, the first height H1 and the first width W1 may be approximately 2.5 μm or greater. The first height H1 may be 1.2 times or greater relative to the second height H2 (e.g., H1 ≥ 1.2×H2). In an embodiment, the second height H2 may be 80% or less of the first height H1. In an embodiment, the third height H3 may be 70% or less of the first height H1.

[0122] In an embodiment, the second width W2, which is the width of the sidewall of the second inclined structure 510b, may be about 1.2 μm to about 2 μm. In this case, the height H2 of the second inclined structure 510b may be about 1.2 μm to about 2.4 μm.

[0123] In an embodiment, the third width W3, which is the width of the sidewall of the third inclined structure 510c, may be about 1.2 μm to about 2 μm. In this case, the height H3 of the third inclined structure 510c may be about 1.2 μm to about 2.4 μm.

[0124] In an embodiment, the pixel P and the first inclined structure 510a may be arranged such that a horizontal (e.g., lateral in a plan view) separation distance d0 is between an edge of the pixel P and an inner edge of the first inclined structure 510a or between an edge of the opening OP of the pixel defining layer 119 and an inner edge of the first inclined structure 510a. In this case, the horizontal separation distance d0 may be selected in consideration of a light path depending on the refractive index of each medium.

[0125] In an embodiment, the horizontal separation distance d0 may be about 0.5 μm to about 1.5 μm. Here, the horizontal separation distance d0 may refer to a separation distance along the top surface of the substrate 100 .

[0126] In an embodiment, a first separation distance d1 between the first inclined structure 510a and the second inclined structure 510b and a second separation distance d2 between the second inclined structure 510b and the third inclined structure 510c may be about 0.5 μm to about 1 μm. The first separation distance d1 and the second separation distance d2 may be defined based on or at the bottom surfaces of the plurality of inclined structures 510a, 510b, and 510c.

[0127] Figure 5 FIG. 1 is a cross-sectional view of a portion of an organic light emitting display device according to another embodiment. Figure 5 Because Figure 4 The same reference numerals as in the drawings denote the same elements, and thus repeated descriptions thereof are omitted.

[0128] refer to Figure 5 The organic light emitting display device according to the present embodiment may include a pixel P implemented as an organic light emitting diode OLED, a thin film encapsulation layer 400 covering the organic light emitting diode OLED, a plurality of inclined structures 510a, 510b and 510c located on the thin film encapsulation layer 400, and a thin film encapsulation layer covering the plurality of inclined structures 510a, 510b and 510c and having a refractive index n greater than that of the plurality of inclined structures 510a, 510b and 510c. 1 The refractive index n 2 A planarization layer 530 is provided.

[0129] The plurality of inclined structures 510a, 510b, and 510c may surround an emission region of one pixel P. The plurality of inclined structures 510a, 510b, and 510c may include a first inclined structure 510a, a second inclined structure 510b, and a third inclined structure 510c.

[0130] In an embodiment, the heights H1, H2, and H3' of the plurality of inclined structures 510a, 510b, and 510c surrounding one pixel P may be different from each other. In an embodiment, because the inclined structure is adjacent to the pixel P, the inclined structure may have a greater height. In an embodiment, because the inclined structure is adjacent to the pixel P, the inclined structure may have a sidewall with a greater width.

[0131] The first inclined structure 510a is most adjacent to the pixel P and may have a first angle θ on its inner surface. 1The first height H1 as the height of the first inclined structure 510a may be greater than the second height H2 as the height of the second inclined structure 510b and the third height H3' as the height of the third inclined structure 510c. The first width W1 as the width of the first inclined structure 510a may be greater than the second width W2 as the width of the second inclined structure 510b and the third width W3' as the width of the third inclined structure 510c.

[0132] The second inclined structure 510b is located outside the first inclined structure 510a and may have a second angle θ on its inner surface. 2 The second height H2 as the height of the second inclined structure 510b may be greater than the third height H3' as the height of the third inclined structure 510c. The second width W2 as the width of the second inclined structure 510b may be greater than the third width W3' as the width of the third inclined structure 510c. In the embodiment, the following relationship may be established: H1>H2>H3', W1>W2>W3'.

[0133] The third inclined structure 510c may be disposed outside the second inclined structure 510b and may have a third angle θ at an inner side surface thereof. 3 The tilt.

[0134] In an embodiment, the first angle θ 1 , the second angle θ 2 and the third angle θ 3 All of them can satisfy the above formula. In the implementation scheme, the first angle θ 1 , the second angle θ 2 and the third angle θ 3 It can be 65° or greater.

[0135] In an embodiment, the first height H1 and the first width W1 may be 2.5 μm or more. In an embodiment, the second height H2 may be 80% or less of the first height H1. In an embodiment, the third height H3 ′ may be 70% or less of the first height H1.

[0136] In an embodiment, the pixel P and the first inclined structure 510a may be arranged so that the horizontal separation distance d0 is between the edge of the pixel P and the inner edge of the first inclined structure 510a or between the edge of the opening OP of the pixel defining layer 119 and the inner edge of the first inclined structure 510a. In this case, the horizontal separation distance d0 may be selected in consideration of the light path depending on the refractive index of each medium.

[0137] In an embodiment, the horizontal separation distance d0 may be about 0.5 μm to about 1.5 μm. In an embodiment, the first separation distance d1 between the first and second inclined structures 510a and 510b and the second separation distance d2 between the second and third inclined structures 510b and 510c may be about 0.5 μm to about 1 μm.

[0138] Figure 6 A graph showing front light efficiency for Case 1 (wherein the height H1 of the first inclined structure 510a adjacent to the pixel P is the highest among the plurality of inclined structures 510a, 510b, and 510c) and for Case 2 (wherein the heights H1', ​​H2, and H3 of the plurality of inclined structures 510a, 510b, and 510c are the same) is shown. Figure 6 , the x-axis represents the exposure amount for forming the plurality of inclined structures 510a, 510b and 510c. In addition, in case 1, the height H1 of the first inclined structure 510a has been set to be greater than the height H1' (not shown) of the first inclined structure 510a in case 2 (H1>H1'=H2=H3).

[0139] refer to Figure 6 It can be seen that the front light efficiency of case 1 is greater than that of case 2. For example, when the height H1 of the first inclined structure 510a adjacent to the pixel P is greater than the heights H2 and H3 of the other inclined structures 510b and 510c, the front light efficiency is improved.

[0140] In addition, when the height H1 of the first inclined structure 510a is increased, the front light efficiency may be constant according to the exposure amount. This means that when the height H1 of the first inclined structure 510a is increased, the process stability may be improved.

[0141] For example, case 1 may be a way to improve frontlight efficiency while improving process stability.

[0142] Figure 7 FIG. 1 is a cross-sectional view of a portion of an organic light emitting display device according to another embodiment. Figure 7 Because Figure 3 The same reference numerals as those in the drawings denote the same elements, and thus repeated descriptions thereof are omitted.

[0143] refer to Figure 7The organic light emitting display device according to the present embodiment may include a pixel P implemented as an organic light emitting diode OLED, a thin film encapsulation layer 400 covering the organic light emitting diode OLED, a plurality of inclined structures 510a, 510b and 510c located on the thin film encapsulation layer 400, and a thin film encapsulation layer covering the plurality of inclined structures 510a, 510b and 510c and having a refractive index n greater than that of the plurality of inclined structures 510a, 510b and 510c. 1 The refractive index n 2 A planarization layer 530 is provided.

[0144] The plurality of inclined structures 510a, 510b, and 510c may surround an emission region of one pixel P. The plurality of inclined structures 510a, 510b, and 510c may include a first inclined structure 510a, a second inclined structure 510b, and a third inclined structure 510c.

[0145] In an embodiment, a height H1 of a first inclined structure 510a most adjacent to the pixel P among the plurality of inclined structures 510a, 510b, and 510c surrounding one pixel P may be greater than heights H2 and H3 of the other inclined structures 510b and 510c.

[0146] In an embodiment, the organic light emitting display device may further include a dam 120 located in the peripheral area PA. The dam 120 may be separated from the path layer 117 and the pixel defining layer 119, and may help prevent the organic material from flowing to the edge of the substrate 100 while forming the organic encapsulation layer 420 of the thin film encapsulation layer 400. In the case where the dam 120 is provided as a plurality of dams, the plurality of dams may be separated from each other.

[0147] The dam 120 may include a single layer or a multilayer structure. As shown, the dam 120 may have a structure in which a first layer 120a and a second layer 120b are stacked. In this case, the first layer 120a may be provided at the same time as the path layer 117 and may include the same material as the path layer 117, and the second layer 120b may be provided at the same time as the pixel defining layer 119 and may include the same material as the pixel defining layer 119.

[0148] Outside the dam 120, the first and second inorganic encapsulating layers 410 and 430 of the thin film encapsulating layer 400 may directly contact each other, and the organic encapsulating layer 420 may not be exposed to the outside. For example, penetration of external air or moisture due to organic materials may be prevented.

[0149] In this embodiment, the window 610 may be located on the planarization layer 530. The window 610 may be the outermost portion of the organic light emitting display device to protect the organic light emitting display device, and may include transparent glass or plastic as an organic transparent base material. The window 610 may be located on the display area DA and the peripheral area PA.

[0150] In an embodiment, a polarizing layer, a color filter layer, a touch screen layer, etc. may be further disposed between the planarization layer 530 and the window 610 .

[0151] Figure 8 FIG. 1 is a cross-sectional view of a portion of an organic light emitting display device according to another embodiment. Figure 8 Because Figure 7 The same reference numerals as those in the drawings denote the same elements, and thus repeated descriptions thereof are omitted.

[0152] The organic light emitting display device according to the present embodiment may include a pixel P implemented as an organic light emitting diode OLED, a thin film encapsulation layer 400 covering the organic light emitting diode OLED, a plurality of inclined structures 510a, 510b, and 510c located on the thin film encapsulation layer 400, and a thin film encapsulation layer covering the plurality of inclined structures 510a, 510b, and 510c and having a refractive index n greater than the plurality of inclined structures 510a, 510b, and 510c. 1 The refractive index n 2 A planarization layer 530 is provided.

[0153] The plurality of inclined structures 510a, 510b, and 510c may surround an emission region of one pixel P. The plurality of inclined structures 510a, 510b, and 510c may include a first inclined structure 510a, a second inclined structure 510b, and a third inclined structure 510c.

[0154] In an embodiment, a height H1 of a first inclined structure 510a most adjacent to the pixel P among the plurality of inclined structures 510a, 510b, and 510c surrounding one pixel P may be greater than heights H2 and H3 of the other inclined structures 510b and 510c.

[0155] In the embodiment, the organic light emitting display device may further include a touch screen layer 700 located between the thin film encapsulation layer 400 and the plurality of inclined structures 510a, 510b, and 510c. For example, the plurality of inclined structures 510a, 510b, and 510c may be located on the touch screen layer 700. In a top view, as shown in FIG. Figure 2A In the embodiment, a plurality of inclined structures 510a, 510b and 510c may be arranged in a ring shape surrounding one pixel P.

[0156] In an embodiment, the first inclined structure 510a, the second inclined structure 510b, and the third inclined structure 510c may have an open shape instead of a closed shape, and may have a shape in which a portion thereof is disconnected.

[0157] The touch screen layer 700 can be set, for example, in a capacitive type. When the window 610 is touched, the mutual capacitance formed between the first touch electrode 711 and the second touch electrode 713 of the touch screen layer 700 changes, and the touch screen layer 700 can determine whether the relevant part has been touched by detecting the changed mutual capacitance. In an embodiment, when the mutual capacitance formed between the first touch electrode 711 and the second touch electrode 713 (also referred to as the first touch conductive layer and the second touch conductive layer) and the relative electrode 330 changes, the touch screen layer 700 can determine whether the relevant part has been touched by detecting the changed mutual capacitance. The touch screen layer 700 can determine whether the relevant part has been touched by using various methods.

[0158] The touch screen layer 700 according to the embodiment may have a structure in which a first touch conductive layer 711, a first insulating layer 712, a second touch conductive layer 713, and a second insulating layer 714 are sequentially stacked. The first touch electrode 711 and the second touch electrode 713 may include a first touch conductive layer 711 and a second touch conductive layer 713, respectively.

[0159] In an embodiment, the second touch conductive layer 713 may be used as a sensor configured to detect whether a touch has been made, and the first touch conductive layer 711 may be used as a connector that connects the patterned second touch conductive layer 713 in one direction.

[0160] In the embodiment, both the first touch conductive layer 711 and the second touch conductive layer 713 can be used as sensors. For example, the first insulating layer 712 may include a through hole exposing the top surface of the first touch conductive layer 711, and the first touch conductive layer 711 and the second touch conductive layer 713 may be connected to each other through the through hole. Since the first touch conductive layer 711 and the second touch conductive layer 713 are used as described above, the resistance of the first touch electrode 711 and the second touch electrode 713 can be reduced, and therefore, the response speed of the touch screen layer 700 can be improved.

[0161] In the embodiment, the first touch electrode 711 and the second touch electrode 713 may be formed in a mesh structure so that light emitted from the organic light emitting diode OLED passes through. Therefore, the first touch conductive layer 711 and the second touch conductive layer 713 of the first touch electrode 711 and the second touch electrode 713 may not overlap with the emission area of ​​the organic light emitting diode OLED.

[0162] The first touch conductive layer 711 and the second touch conductive layer 713 may each include a single layer or multiple layers, and the single layer or multiple layers include a conductive material with excellent conductivity. For example, the first touch conductive layer 711 and the second touch conductive layer 713 may each include a single layer or multiple layers, and the single layer or multiple layers include a transparent conductive layer and a conductive material containing Al, Cu and / or Ti. The transparent conductive layer may include a transparent conductive oxide, such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO) and indium tin zinc oxide (ITZO). In addition, the transparent conductive layer may include a conductive polymer such as poly-(3,4)-ethylene-dihydroxythiophene (PEDOT), metal nanowires and graphene. In an embodiment, the first touch conductive layer 711 and the second touch conductive layer 713 may each include a stacked structure of Ti / Al / Ti.

[0163] The first insulating layer 712 and the second insulating layer 714 may each include an inorganic material or an organic material. The inorganic material may include at least one of silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium oxide, tin oxide, cesium oxide, and silicon oxynitride. The organic material may include at least one of an acrylic-based resin, a methacrylic-based resin, a polyisoprene resin, a vinyl-based resin, an epoxy-based resin, a urethane-based resin, a cellulose-based resin, and a phenylene-based resin.

[0164] In an embodiment, a touch buffer layer may be further disposed between the thin film encapsulation layer 400 and the touch screen layer 700. The touch buffer layer may help prevent damage to the thin film encapsulation layer 400 and block interference signals that may occur when driving the touch screen layer 700. The touch buffer layer may include an inorganic material such as silicon oxide, silicon nitride, silicon oxynitride, aluminum oxide, aluminum nitride, titanium oxide, or titanium nitride, or an organic material such as polyimide, polyester, and acrylic, and may include a stack including the above materials.

[0165] The touch buffer layer and / or the touch screen layer 700 may be directly formed on the thin film encapsulation layer 400 by deposition or the like, and a separate adhesive layer may not be required on the thin film encapsulation layer 400. Therefore, the thickness of the organic light emitting display device may be reduced.

[0166] As described above, according to the embodiment, a plurality of inclined structures surrounding a pixel may be provided, a first inclined structure most adjacent to the pixel among the plurality of inclined structures may have the largest height, and front light efficiency and side visibility may be improved simultaneously.

[0167] One or more embodiments may provide an organic light emitting display device having improved front light efficiency.

[0168] One or more embodiments may provide an organic light emitting display device having improved front light efficiency while having excellent side visibility.

[0169] Example embodiments have been disclosed herein, and although specific terms are employed, the specific terms are used and interpreted in a general and descriptive sense only, and not for limiting purposes. In some cases, as will be clear to those skilled in the art at the time of filing this application, unless otherwise expressly noted, the features, characteristics, and / or elements described in conjunction with a specific embodiment may be used alone or in combination with the features, characteristics, and / or elements described in conjunction with other embodiments. Therefore, it will be understood by those skilled in the art that various changes in form and detail may be made without departing from the spirit and scope of the invention set forth in this disclosure.

Claims

1. An organic light emitting display device, wherein: The organic light emitting display device comprises: substrate; A pixel, located in a display area of ​​the organic light emitting display device, wherein the pixel is implemented by an organic light emitting diode on the substrate; a first tilted structure surrounding the pixel; a second inclined structure at least partially surrounding the first inclined structure; and a planarization layer covering the first inclined structure and the second inclined structure and having a refractive index greater than that of the first inclined structure and greater than that of the second inclined structure, wherein the height of the first inclined structure is greater than the height of the second inclined structure, The organic light emitting display device further comprises a thin film encapsulation layer covering the organic light emitting diode on the substrate, wherein the thin film encapsulation layer comprises a first inorganic encapsulation layer, an organic encapsulation layer and a second inorganic encapsulation layer. Wherein, the first inclined structure and the second inclined structure are located on the thin film encapsulation layer.

2. The organic light emitting display device according to claim 1, wherein: The width of the wall of the first inclined structure is greater than the width of the wall of the second inclined structure.

3. The organic light emitting display device according to claim 1, wherein: The height of the first inclined structure is 1.2 times or more the height of the second inclined structure.

4. The organic light emitting display device according to claim 1, wherein: The height of the first inclined structure is 2.5 μm or more.

5. The organic light emitting display device according to claim 1, wherein: A horizontal separation distance between an edge of the pixel and an inner edge of the first inclined structure along a top surface of the substrate is about 0.5 μm to about 1.5 μm.

6. The organic light emitting display device according to claim 1, wherein: The organic light emitting display device further includes a third inclined structure at least partially surrounding the second inclined structure. Wherein, the height of the second inclined structure is the same as the height of the third inclined structure.

7. The organic light emitting display device according to claim 1, wherein: The organic light emitting display device further includes a third inclined structure at least partially surrounding the second inclined structure. Wherein, the height of the second inclined structure is greater than the height of the third inclined structure.

8. The organic light emitting display device according to claim 1, wherein: The first inclined structure has a closed loop shape, and The second inclined structure has a closed loop shape.

9. The organic light emitting display device according to claim 1, wherein: The cross-sectional shape of the first inclined structure has a tapered inclination, and The tilt angle θ satisfies the following formula: Wherein, n1 is the refractive index of the first inclined structure, and n2 is the refractive index of the planarization layer.

10. The organic light emitting display device according to claim 1, wherein: The organic light emitting display device further includes a dam in a peripheral area of ​​the organic light emitting display device surrounding the display area, The first inorganic encapsulating layer and the second inorganic encapsulating layer are directly in contact with each other outside the dam.

11. The organic light emitting display device according to claim 1, wherein: The organic light emitting display device further comprises: A touch screen layer is located on the thin film encapsulation layer, Wherein, the first inclined structure and the second inclined structure are located on the touch screen layer.

12. An organic light emitting display device, wherein: The organic light emitting display device comprises: substrate; An organic light emitting diode, located in a display area of ​​the organic light emitting display device, the organic light emitting diode comprising a pixel electrode, an intermediate layer and a counter electrode; a pixel defining layer covering an edge of the pixel electrode and defining an emission area through an opening exposing a central portion of the pixel electrode; a thin film encapsulation layer, covering the organic light emitting diode and comprising at least one organic encapsulation layer and at least one inorganic encapsulation layer; a plurality of inclined structures located on the thin film encapsulation layer and at least partially surrounding the opening; and a planarization layer covering the plurality of inclined structures, The height of a first inclined structure among the plurality of inclined structures, which is closest to the emission region, is greater than the heights of other inclined structures among the plurality of inclined structures.

13. The organic light emitting display device according to claim 12, wherein: The plurality of inclined structures include a second inclined structure surrounding the first inclined structure, and The height of the first inclined structure is 1.2 times or more than the height of the second inclined structure.

14. The organic light emitting display device according to claim 12, wherein: The refractive index of each of the plurality of inclined structures is about 1.4 to about 1.55, and The refractive index of the planarization layer is about 1.6 to about 1.

85.

15. The organic light emitting display device according to claim 12, wherein: A horizontal separation distance between an edge of the opening and an inner edge of the first inclined structure along a top surface of the substrate is about 0.5 μm to about 1.5 μm.

16. The organic light emitting display device according to claim 12, wherein: Each of the plurality of inclined structures has a closed loop shape.

17. The organic light emitting display device according to claim 12, wherein: The cross-sectional shape of the first inclined structure has a tapered inclination, and The tilt angle θ satisfies the following formula: Wherein, n1 is the refractive index of the first inclined structure, and n2 is the refractive index of the planarization layer.

18. The organic light emitting display device according to claim 12, wherein: The organic light emitting display device further includes a dam in a peripheral area surrounding the display area, The at least one inorganic encapsulating layer includes a first inorganic encapsulating layer and a second inorganic encapsulating layer, and the first inorganic encapsulating layer and the second inorganic encapsulating layer are in direct contact with each other outside the dam.

19. The organic light emitting display device according to claim 12, wherein: The organic light emitting display device further comprises a touch screen layer located on the thin film encapsulation layer, Wherein, the plurality of inclined structures are located on the touch screen layer.

20. The organic light emitting display device according to claim 12, wherein: The plurality of inclined structures include a second inclined structure at least partially surrounding the first inclined structure, The first inclined structure has a closed loop shape, and The second inclined structure has a discontinuous shape including a plurality of second sub-islands spaced apart from each other.

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