Display device

Abstract

A display device includes a plurality of light emitting regions corresponding to a plurality of sub-pixels, the display device including: a substrate; a circuit element layer disposed on the substrate; a first passivation layer covering the circuit element layer; a first coating layer disposed on the first passivation layer; a second passivation layer disposed on the first coating layer, the second passivation layer having a first trench at a portion between two adjacent ones of the light emitting regions, the first trench penetrating the second passivation layer, where the second passivation layer includes a first inclined surface exposed by the first trench; a second coating layer disposed on the second passivation layer, the second coating layer having a second trench defined by a second inclined surface of the second coating layer, and the second trench exposing the first trench; a first electrode disposed on the second coating layer and exposing the first trench and the second trench; an organic layer disposed on the first electrode, the first inclined surface, and the second inclined surface; and a second electrode disposed on the organic layer.

Description

[0001] Cross - reference to related applications

[0002] This application claims priority to Korean Patent Application No. 10 - 2023 - 0192986, filed on December 27, 2023, which is incorporated herein by reference in its entirety for all purposes as if fully set forth herein. Technical field

[0003] Embodiments of the present disclosure relate to a display device. Background art

[0004] With the development of the information society, the demand for display devices for displaying images is increasing in various forms. Accordingly, various display devices such as liquid crystal display devices (LCDs), inorganic light - emitting display devices, and organic light - emitting display devices (OLEDs) have been recently used.

[0005] In a display device, an organic light - emitting display device, which is a self - emissive type, provides the following advantages: it has a superior viewing angle and contrast ratio compared to a liquid crystal display device (LCD), and does not require a separate backlight, thus being lightweight and thin and advantageous in terms of power consumption. In addition, the organic light - emitting display device provides the following advantages: it can be driven with a low DC voltage, has a fast response speed, and particularly has a low manufacturing cost. Summary of the invention

[0006] Various embodiments of the present disclosure relate to providing a display device capable of improving light extraction efficiency and suppressing lateral leakage current.

[0007] Various embodiments of the present disclosure relate to providing a display device capable of suppressing lateral leakage current to prevent unintended sub - pixel light emission and capable of improving color gamut and display quality at low gray levels.

[0008] It should be noted that the objectives of the present disclosure are not limited to those described above, and other objectives of the present disclosure will be apparent to those skilled in the art from the following description.

[0009] A display device includes a plurality of light-emitting regions corresponding to a plurality of sub-pixels, and the display device includes: a substrate; a circuit element layer disposed on the substrate; a first passivation layer covering the circuit element layer; a first coating layer disposed on the first passivation layer; a second passivation layer disposed on the first coating layer, the second passivation layer having a first trench at a portion between two adjacent light-emitting regions among the plurality of light-emitting regions, the first trench penetrating through the second passivation layer, wherein the second passivation layer includes a first inclined surface exposed by the first trench; a second coating layer disposed on the second passivation layer, the second coating layer having a second trench defined by a second inclined surface of the second coating layer adjacent to the first trench, and the second trench exposing the first trench; a first electrode disposed on the second coating layer and exposing the first trench and the second trench; an organic layer disposed on the first electrode, the first inclined surface, and the second inclined surface; and a second electrode disposed on the organic layer.

[0010] A display device includes a plurality of light-emitting regions corresponding to a plurality of sub-pixels, and the display device includes: a substrate; a circuit element layer disposed on the substrate; a first passivation layer disposed on the circuit element layer; a first coating layer disposed on the first passivation layer; a second coating layer disposed on the first coating layer, the second coating layer having a first trench at a portion between two adjacent light-emitting regions among the plurality of light-emitting regions, the first trench penetrating through the second coating layer, wherein the second coating layer includes a first inclined surface exposed by the first trench; a second passivation layer disposed on the second coating layer, the second passivation layer having a second trench defined by a second inclined surface of the second passivation layer adjacent to the first trench, and the second trench exposing the first trench; a first electrode disposed on the second passivation layer and exposing the first trench and the second trench; an organic layer disposed on the first electrode, the first inclined surface, and the second inclined surface; and a second electrode disposed on the organic layer.

[0011] A display device includes a plurality of light-emitting regions corresponding to a plurality of sub-pixels, and the display device includes: a substrate; a circuit element layer disposed on the substrate; a first passivation layer disposed on the circuit element layer; a color filter layer disposed on the first passivation layer; a second passivation layer covering the color filter layer; a coating layer disposed on the second passivation layer, the coating layer having a first trench at a portion between two adjacent light-emitting regions among the plurality of light-emitting regions, the first trench having a first inclined surface of the coating layer; a first electrode disposed on the coating layer and exposing the first trench; an organic layer disposed on the first electrode and the first inclined surface; and a second electrode disposed on the organic layer.

[0012] A display device includes: a display panel including an active area and a non-active area surrounding the active area, the active area having a plurality of light-emitting areas corresponding to a plurality of sub-pixels, the display panel including: a substrate; a circuit element layer disposed on the substrate; a first passivation layer disposed on the circuit element layer; a color filter layer disposed on the first passivation layer; a second passivation layer covering the color filter layer; a coating layer disposed on the second passivation layer, the coating layer having a first trench at a portion between two adjacent light-emitting areas among the plurality of light-emitting areas, the first trench having a first inclined surface of the coating layer; a first electrode disposed on the coating layer and exposing the first trench; an organic layer disposed on the first electrode and the first inclined surface; and a second electrode disposed on the organic layer.

[0013] According to an embodiment of the present disclosure, a display device capable of improving light extraction efficiency and suppressing side leakage current can be provided.

[0014] According to an embodiment of the present disclosure, a display device can be provided that can suppress side leakage current to minimize the light emission of unintended sub-pixels in order to improve the color gamut; and can minimize the visual recognition of spots or color abnormalities when displaying low-gray images, thereby improving the display quality.

[0015] According to an embodiment of the present disclosure, a display device can be provided that can improve light extraction efficiency to increase the light emission amount of the display device in order to increase brightness; can emit a sufficient amount of light at a low voltage to reduce power consumption; and can improve light efficiency to increase the viewing angle and brightness in order to provide a wide viewing angle.

[0016] According to an embodiment of the present disclosure, a display device capable of suppressing oxygen penetration from the outside to prevent defects caused by oxygen penetration and improving reliability can be provided.

[0017] According to an embodiment of the present disclosure, a display device capable of being manufactured at low cost by reducing the number of masks to be used can be provided.

[0018] It should be noted that the effects of the present disclosure are not limited to the effects described above, and according to the following description, other effects of the present disclosure will be apparent to those skilled in the art. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a diagram showing a schematic system configuration of a display device according to an embodiment of the present disclosure;

[0020] Figure 2 is a plan view schematically showing pixels arranged in a display panel of a display device according to an embodiment of the present disclosure.

[0021] Figure 3 is a diagram showing an example of a cross-section taken along the line I-I'. Figure 2

[0022] Figure 4 is Figure 3 an enlarged view of part A of

[0023] Figure 5 is a diagram showing that the contour of the organic layer changes according to the inclination angle of the side surface of the trench under the organic layer.

[0024] Figure 6 is a diagram showing that the contour of the organic layer changes according to the depth of the trench under the organic layer.

[0025] Figures 7A to 7E is a cross-sectional view showing a method of manufacturing a display panel of a display device according to an embodiment of the present disclosure.

[0026] Figure 8 is a diagram showing an example of a cross-section of a display panel of a display device according to an embodiment of the present disclosure.

[0027] Figures 9A to 9E is a cross-sectional view showing a method of manufacturing a display panel of a display device according to an embodiment of the present disclosure.

[0028] Figures 10 to 12 is a diagram showing an example of a cross-section of a display panel of a display device according to an embodiment of the present disclosure.

[0029] Figures 13A to 13E is a cross-sectional view showing a method of manufacturing a display panel of a display device according to an embodiment of the present disclosure.

[0030] Figure 14 is a diagram showing an example of a cross-section of a display panel of a display device according to an embodiment of the present disclosure. Detailed Embodiments

[0031] ​In the following description of examples or embodiments of the present disclosure, reference will be made to the accompanying drawings, in which specific examples or embodiments that can be implemented are illustrated by way of illustration, and the same reference numerals and symbols in the drawings can be used to represent the same or similar components, even when these components are shown in different drawings from each other. Further, in the following description of examples or embodiments of the present disclosure, when it is determined that the description may make the subject matter in some embodiments of the present disclosure rather unclear, a detailed description of well-known functions and components incorporated herein will be omitted. Terms such as "comprising", "having", "including", "constituting", "composing", and "formed of" used herein are generally intended to allow the addition of other components, unless these terms are used together with the term "only". As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form.

[0032] Terms such as "first", "second", "A", "B", "(A)", or "(B)" may be used herein to describe elements of the present disclosure. Each of these terms does not define the essence, order, sequence, number, etc. of the element, but is merely used to distinguish the corresponding element from other elements.

[0033] When it is mentioned that a first element is "connected or coupled", "contacted or overlapped" with a second element, etc., it should be interpreted that the first element can not only be "directly connected or coupled" or "directly contacted or overlapped" with the second element, but also a third element can be "inserted" between the first element and the second element, or the first element and the second element can be "connected or coupled", "contacted or overlapped" with each other via a fourth element, etc. Here, the second element may be included in at least one of two or more elements that are "connected or coupled", "contacted or overlapped" with each other, etc.

[0034] When temporal relativity terms, such as "after", "subsequently", "next", "before", etc. are used to describe the processing or operation of an element or configuration, or the process or steps in an operation, processing, manufacturing method, these terms can be used to describe non - continuous or non - sequential processing or operations, unless the terms "directly" or "immediately" are used together.

[0035] In addition, when any dimension, relative size, etc. are mentioned, it should be considered that the numerical value of the element or feature, or the corresponding information (e.g., level, range, etc.) includes a tolerance or error range that may be caused by various factors (e.g., process factors, internal or external influences, noise, etc.), even when no relevant description is specified. Further, the term "may" fully encompasses all meanings of the term "can".

[0036] Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0037] Figure 1 This is a diagram showing a schematic system configuration of a display device according to an embodiment of the present disclosure.

[0038] Referring to Figure 1 , the display device 100 according to an embodiment of the present disclosure includes a display panel 110. In addition, the display device 100 includes a driving circuit for driving various signal lines and the like arranged in the display panel 110. The driving circuit may include a gate driving circuit 120, a data driving circuit 130, and a controller 140.

[0039] The display panel 110 includes an active area A / A and a non-active area N / A outside the active area A / A. A plurality of sub-pixels SP are arranged in the active area A / A of the display panel 110. A plurality of gate lines GL extending in a first direction (e.g., a column direction or a row direction) and a plurality of data lines DL extending in a second direction intersecting the first direction are arranged in the display panel 110, and sub-pixels SP may be arranged in an area where the gate lines GL and the data lines DL intersect each other.

[0040] The gate driving circuit 120 may generate a gate signal and output the gate signal to the plurality of gate lines GL. As Figure 1 shown, the gate driving circuit 120 may be arranged in the non-active area N / A of the display panel 110. That is, the display device 100 may be a gate-in-panel (GIP) type.

[0041] Although not shown, the gate driving circuit 120 may be formed separately from the display panel 110 and may be connected to the display panel 110 by a tape automated bonding (TAB) method, may be connected to a bonding pad of the display panel 110 by a chip-on-glass (COG) or chip-on-panel (COP) method, or may be connected to the display panel 110 by being implemented by a chip-on-film (COF) method.

[0042] The data driving circuit 130 may output a data signal (also referred to as a "data voltage") corresponding to an image signal to the plurality of data lines DL. The data driving circuit 130 may include at least one source driver integrated circuit. For example, each source driver integrated circuit may be connected to the display panel 110 by a TAB method, may be connected to a bonding pad of the display panel 110 by a COG or COP method, or may be connected to the display panel 110 by being implemented by a COF method.

[0043] In Figure 1In the figure, the data driving circuit 130 is shown as a component separate from the display panel 110, but the data driving circuit 130 may be configured in an in-panel method to be integrally formed with the display panel 110. The data driving circuit 130 may be disposed in the non-active area N / A of the display panel 110.

[0044] The controller 140 may convert the input image data input from an external host (not shown) to fit the data signal format used in the data driving circuit 130, and may supply the converted image data to the data driving circuit 130.

[0045] The sub-pixel SP may include a light-emitting element ED and a pixel driving circuit for driving the light-emitting element ED. The pixel driving circuit may include a driving transistor DRT, a scanning transistor SCT, and a storage capacitor Cst.

[0046] For example, the light-emitting element ED may be an organic light-emitting diode (OLED), an inorganic-based light-emitting diode (LED), or a quantum dot light-emitting element, which is a self-luminous semiconductor crystal.

[0047] When the display device 100 according to an embodiment of the present disclosure is an OLED display, each sub-pixel SP may include an organic light-emitting diode (OLED) that emits light by itself as the light-emitting element. When the display device 100 according to an embodiment of the present disclosure is a quantum dot display, each sub-pixel SP may include a light-emitting element made of quantum dots, which is a self-luminous semiconductor crystal. When the display device 100 according to an embodiment of the present disclosure is a micro LED display, each sub-pixel SP may include a micro light-emitting diode (micro LED) as the light-emitting element, which emits light by itself and is made of an inorganic material.

[0048] As a transistor for driving the light-emitting element ED by controlling the current flowing through the light-emitting element ED, the driving transistor DRT may have a first node N1, a second node N2, and a third node N3. The first node N1 may be a source node or a drain node, and may be electrically connected to the anode electrode AE of the light-emitting element ED. The second node N2 may be a gate node, and may be electrically connected to the source node or the drain node of the scanning transistor SCT. The third node N3 may be a drain node or a source node, and may be connected to a driving voltage line DVL that supplies a driving voltage EVDD.

[0049] The scan transistor SCT can control the connection between the data line DL and the second node N2 of the driving transistor DRT. In response to a scan signal SCAN supplied to the scan line SCL which is a type of gate line GL, the scan transistor SCT can connect the second node N2 of the driving transistor DRT to the corresponding data line DL among the plurality of data lines DL. The scan transistor SCT can transfer a data voltage Vdata to the second node N2 in response to the scan signal SCAN, and the second node N2 is the gate node of the driving transistor DRT.

[0050] The storage capacitor Cst can be connected between the first node N1 and the second node N2 of the driving transistor DRT, and can maintain the voltage of the second node N2 for a certain period of time.

[0051] For example, as Figure 1 shown, each sub-pixel SP can have a 2T (transistor) 1C (capacitor) structure including two transistors DRT and SCT and one capacitor Cst, but the embodiments of the present disclosure are not limited thereto. Depending on the specific situation, each sub-pixel SP may further include at least one transistor or at least one capacitor.

[0052] Figure 2 is a plan view schematically showing pixels arranged in a display panel of a display device according to an embodiment of the present disclosure, Figure 3 is showing an example of a cross-section taken along the Figure 2 line I-I′, and Figure 4 is Figure 3 an enlarged view of part A of

[0053] Referring to Figure 2 , in the active area A / A of the display panel, a plurality of sub-pixels SP1 to SP4 are arranged. The sub-pixels SP1 to SP4 may include a red (R) sub-pixel SP1, a white (W) sub-pixel SP2, a blue (B) sub-pixel SP3, and a green (G) sub-pixel SP4. As Figure 2 shown, the sub-pixels SP1 to SP4 may be arranged in the order of the red sub-pixel SP1, the white sub-pixel SP2, the blue sub-pixel SP3, and the green sub-pixel SP4, but the arrangement order of the sub-pixels is not limited thereto and may be changed in various ways.

[0054] In an embodiment of the present disclosure, an organic layer that generates white (W) light is commonly arranged in the sub-pixels SP1 to SP4, a red (R) color filter is arranged in the red sub-pixel SP1, a blue (B) color filter is arranged in the blue sub-pixel SP3, and a green (G) color filter is arranged in the green sub-pixel SP4. No separate color filter is arranged in the white sub-pixel SP2.

[0055] Each of the sub-pixels SP1 to SP4 includes a light-emitting region EA and a non-light-emitting region NEA. The non-light-emitting region NEA may be disposed outside the light-emitting region EA and may surround the periphery of the light-emitting region EA. The non-light-emitting region NEA may be disposed between the light-emitting regions EA of two adjacent sub-pixels.

[0056] Referring to Figure 3 and Figure 4 According to an embodiment of the present disclosure, a display panel of a display device may include a substrate 10. A circuit element layer 20 may be disposed on the substrate 10. The circuit element layer 20 may include circuit elements (e.g., driving transistors, sensing transistors, and storage capacitors) that constitute sub-pixels and wirings 21.

[0057] The circuit element layer 20 may include a first conductive layer disposed on the substrate 10. The first conductive layer may include a plurality of wirings 21. The wirings 21 may include data lines, driving voltage lines, and sensing lines.

[0058] The wirings 21 may be disposed in the non-light-emitting region NEA between adjacent light-emitting regions EA. The first conductive layer may include a light-blocking layer (not shown) and bottom electrodes of each storage capacitor. The light-blocking layer may be disposed to overlap with the semiconductor pattern of each driving transistor to protect the oxide semiconductor element from external light. The bottom electrode of the storage capacitor may be electrically connected to the gate node of the driving transistor.

[0059] The circuit element layer 20 may include a buffer layer 22. The buffer layer 22 may be disposed on the substrate 10 to cover the wirings 21, the light-blocking layer, and the bottom electrodes of the storage capacitors.

[0060] The buffer layer 22 may prevent ions or impurities from diffusing from the substrate 10 and block moisture penetration. In addition, the buffer layer 22 may also improve surface flatness. The buffer layer 22 may include an inorganic material such as an oxide or a nitride, an organic material, or an organic-inorganic composite material, and may be formed in a single-layer or multi-layer structure. For example, the buffer layer 22 may have a structure of at least three layers made of silicon oxide, silicon nitride, and silicon oxide. In another embodiment, the buffer layer 22 may be omitted.

[0061] Although not shown, the circuit element layer 20 may include an active layer, a gate insulating layer, and a second conductive layer. The active layer may be disposed on the buffer layer 22. The active layer may be formed of a silicon-based semiconductor material or an oxide-based semiconductor material. As the silicon-based semiconductor material, amorphous silicon or polycrystalline silicon may be used. As the oxide-based semiconductor material, a quaternary metal oxide such as indium tin gallium zinc oxide (InSnGaZnO), a ternary metal oxide such as indium gallium zinc oxide (InGaZnO), indium tin zinc oxide (InSnZnO), indium aluminum zinc oxide (InAlZnO), tin gallium zinc oxide (SnGaZnO), aluminum gallium zinc oxide (AlGaZnO), and tin aluminum zinc oxide (SnAlZnO), a binary metal oxide such as indium zinc oxide (InZnO), tin zinc oxide (SnZnO), aluminum zinc oxide (AlZnO), zinc magnesium oxide (ZnMgO), tin magnesium oxide (SnMgO), indium magnesium oxide (InMgO), and indium gallium oxide (InGaO), or a single metal oxide such as indium oxide (InO), tin oxide (SnO), and zinc oxide (ZnO) may be used. The active layer may include a source region, a drain region, and a channel region between the source region and the drain region.

[0062] The gate insulating layer may be disposed on the active layer. The second conductive layer may be disposed on the gate insulating layer. The second conductive layer may include a gate electrode, a source electrode, and a drain electrode. The second conductive layer may further include a top electrode of a storage capacitor.

[0063] A first passivation layer 30 may be disposed on the circuit element layer 20. The first passivation layer 30 may cover the second conductive layer (not shown) and the buffer layer 22 not covered by the second conductive layer. The first passivation layer 30 may include a photosensitive organic material. The first passivation layer 30 may be formed as an inorganic insulating layer such as silicon nitride (SiNx) and silicon oxide (SiOx), or an organic insulating layer such as polyacrylate and polyimide, and the embodiments of the present disclosure are not limited thereto.

[0064] A color filter 40 may be disposed on the first passivation layer 30. The color filter 40 is a wavelength selective filter that selectively transmits only a part of the wavelength band of incident light by transmitting light of a specific wavelength band and blocking light of another specific wavelength band, and may be made of a photosensitive resin including a colorant such as a pigment or a dye.

[0065] When a sub-pixel displays red (R) color, a red color filter 40R may be disposed in a light-emitting region EA of the corresponding sub-pixel. When a sub-pixel displays blue (B) color, a blue color filter 40B may be disposed in a light-emitting region EA of the corresponding sub-pixel. When a sub-pixel displays green (G) color, a green color filter (not shown) may be disposed in a light-emitting region EA of the corresponding sub-pixel. The light that has passed through the color filter 40 may have any one of the colors red (R), green (G), and blue (B). When a sub-pixel displays white (W) color, the color filter may be omitted in a light-emitting region EA of the corresponding sub-pixel.

[0066] A first coating layer 50 may be disposed on the first passivation layer 30 and the color filter 40. The first coating layer 50 may be disposed on the first passivation layer 30 to cover the color filter 40. The first coating layer 50 may include an organic material such as polyimide, benzocyclobutene series resin, or acrylate.

[0067] A second passivation layer 60 may be disposed on the first coating layer 50. The second passivation layer 60 may include a photosensitive organic material. The second passivation layer 60 may be formed as an inorganic insulating layer such as silicon nitride (SiNx) and silicon oxide (SiOx), or an organic insulating layer such as polyacrylate and polyimide, and embodiments of the present disclosure are not limited thereto.

[0068] A first trench T11 may be formed in the second passivation layer 60 between adjacent light-emitting regions EA. The first trench T11 may penetrate the second passivation layer 60 to expose a part of the first coating layer 50. The first trench T11 may expose a side surface (first inclined surface) 60S of the second passivation layer 60.

[0069] A second coating layer 70 may be disposed on the second passivation layer 60. The second coating layer 70 may include an organic material such as polyimide, benzocyclobutene series resin, or acrylate.

[0070] The first coating layer 50 and the second coating layer 70 may prevent exhaust gas generated from the color filter 40 from transferring to the light-emitting element 80 disposed on the second coating layer 70.

[0071] A second trench T21 exposing the first trench T11 may be formed in the second coating layer 70. The second trench T21 may have a tapered shape, and its size decreases toward the substrate 10. A side surface (second inclined surface) 70S of the second coating layer 70 may be exposed through the second trench T21. The second inclined surface 70S of the second coating layer 70 may be provided in a shape of a side ring along the edge of the light-emitting region EA.

[0072] The first inclined surface 60S of the second passivation layer 60 exposed through the first trench T11 may have a first inclination angle θ1. The second inclined surface 70S of the second coating layer 70 exposed through the second trench T21 may have a second inclination angle θ2 different from the first inclination angle θ1. The first inclination angle θ1 may be greater than the second inclination angle θ2. The first inclined surface 60S may have a steeper slope compared to the second inclined surface 70S.

[0073] The first trench T11 may be formed by etching the second passivation layer 60 exposed through the second trench T21. In an embodiment, the first trench T11 may be self-aligned with the second trench T21. Although not shown, in another embodiment, when the second passivation layer 60 is over-etched during the etching process for forming the first trench T11, the top of the first trench T11 may have a larger size than the bottom of the second trench T21. In this case, an undercut structure in which the edge of the first trench T11 is covered by the second coating layer 70 may be formed.

[0074] A first electrode 81 exposing the first trench T11 and the second trench T21 is disposed on the second coating layer 70. The first electrode 81 may be a pixel electrode or an anode electrode of the light-emitting element 80. The first electrode 81 may be a transparent electrode. The first electrode 81 may be a reflective electrode. The first electrode 81 may include a reflective layer. The reflective layer may be made of aluminum (Al), copper (Cu), silver (Ag), nickel (Ni), or an alloy thereof. In an embodiment, the reflective layer may be made of APC (silver / palladium / copper alloy).

[0075] The second trench T21 may be formed by etching the second coating layer 70 not covered by the first electrode 81. In an embodiment, the second trench T21 may be self-aligned with the first electrode 81.

[0076] An organic layer 82 may be disposed on the first electrode 81, the second inclined surface 70S of the second coating layer 70, and the first inclined surface 60S of the second passivation layer 60. The organic layer 82 may be commonly formed for a plurality of sub-pixels without a projection mask.

[0077] The organic layer 82 may have a structure in which a plurality of layers are stacked. For example, the organic layer 82 may have a tandem structure. The organic layer 82 may include a first light-emitting unit 82a, a charge generation layer 82b disposed on the first light-emitting unit 82a, and a second light-emitting unit 82c disposed on the charge generation layer 82b.

[0078] Although not shown, the first light-emitting unit 82a may include a hole injection layer, a first hole transport layer, a first light-emitting material layer, and a first electron transport layer. The first hole transport layer is located between the hole injection layer and the first light-emitting material layer, the first light-emitting material layer is located between the first hole transport layer and the first electron transport layer, and the first electron transport layer is located between the first light-emitting material layer and the charge generation layer 82b. The hole injection layer may be omitted depending on the structure or characteristics of the light-emitting element.

[0079] The second light-emitting unit 82c may include a second hole transport layer, a second light-emitting material layer, a second electron transport layer, and an electron injection layer. The second hole transport layer is located between the charge generation layer 82b and the second light-emitting material layer, the second light-emitting material layer is located between the second hole transport layer and the second electron transport layer, and the electron injection layer is located between the second electron transport layer and the second electrode 83.

[0080] The hole injection layer is for facilitating the injection of holes, and the electron injection layer is for facilitating the injection of electrons. The first hole transport layer and the second hole transport layer are respectively for facilitating the transport of holes in the first light-emitting unit 82a and the second light-emitting unit 82c. The first electron transport layer and the second electron transport layer are respectively for facilitating the transport of electrons in the first light-emitting unit 82a and the second light-emitting unit 82c.

[0081] The first light-emitting material layer and the second light-emitting material layer may be formed by doping a matrix with a dopant and may emit different colors. The first light-emitting material layer may emit light of a first wavelength and a second wavelength, and the second light-emitting material layer may emit light of a third wavelength. The light of the first wavelength and the second wavelength emitted from the first light-emitting material layer and the light of the third wavelength emitted from the second light-emitting material layer may be mixed with each other to achieve white light. For example, the first light-emitting material layer may emit blue (B) light, red (R) light, green (G) light, or yellow (Y) light. When the first light-emitting material layer is a blue light-emitting material layer, the first light-emitting material layer includes one of a blue light-emitting material layer, a dark blue light-emitting material layer, and a sky blue light-emitting material layer. Alternatively, the first light-emitting material layer may include a blue (B) light-emitting material layer and a red (R) light-emitting material layer, a blue (B) light-emitting material layer and a yellow-green (YG) light-emitting material layer, or a blue (B) light-emitting material layer and a green (G) light-emitting material layer. The second light-emitting material layer may be any one of a red (R) light-emitting material layer, a green (G) light-emitting material layer, a blue (B) light-emitting material layer, and a yellow-green (YG) light-emitting material layer.

[0082] The charge generation layer 82b is disposed between the first light-emitting unit 82a and the second light-emitting unit 82c, and may include an N-type charge generation layer positioned adjacent to the first light-emitting unit 82a and a P-type charge generation layer positioned adjacent to the second light-emitting unit 82c. The N-type charge generation layer injects electrons into the first light-emitting unit 82a, and the P-type charge generation layer injects holes into the second light-emitting unit 82c.

[0083] At least one layer among the plurality of layers included in the organic layer 82 may be cut in a region including the boundary between the first inclined surface 60S and the second inclined surface 70S. For example, the charge generation layer 82b of the organic layer 82 may be cut. The region including the boundary between the first inclined surface 60S and the second inclined surface 70S may be disposed between adjacent light-emitting regions EA, and the charge generation layer 82b may be cut between adjacent light-emitting regions EA of sub-pixels.

[0084] The second electrode 83 of the light-emitting element 80 may be disposed on the organic layer 82. The second electrode 83 may be a reflective electrode. For example, the second electrode 83 may be made of any one selected from the group including: silver (Ag), aluminum (Al), magnesium (Mg), chromium (Cr), titanium (Ti), nickel (Ni), tungsten (W), gold (Au), tantalum (Ta), copper (Cu), cobalt (Co), iron (Fe), molybdenum (Mo), and platinum (Pt) or an alloy of metals.

[0085] The second electrode 83 includes a first portion 83a that overlaps with the first electrode 81 and a second portion 83b that overlaps with the second inclined surface 70S of the second coating layer 70.

[0086] The first portion 83a of the second electrode 83 may constitute the light-emitting element 80. The light-emitting element 80 may include the first electrode 81, the first portion 83a of the second electrode 83, and the organic layer 82 disposed therebetween. Light may be generated in the organic layer 82 between the first electrode 81 and the first portion 83a of the second electrode 83 by the difference between the voltage applied to the first electrode 81 and the voltage applied to the second electrode 83.

[0087] The second portion 83b of the second electrode 83 may have a slope corresponding to the second inclination angle θ2 of the second inclined surface 70S of the second coating layer 70. The second portion 83b of the second electrode 83 may have a side ring shape surrounding the periphery of the light-emitting region EA.

[0088] The second part 83b of the second electrode 83 can function as follows: increasing the light extraction efficiency by reflecting light generated in the organic layer 82 between the first electrode 81 and the first part 83a of the second electrode 83. The light extraction efficiency can vary according to the tilt angle of the second part 83b of the second electrode 83. The magnitude of the second tilt angle θ2 of the second tilt surface 70S of the second coating layer 70 corresponding to the tilt angle of the second part 83b of the second electrode 83 can be set to improve the light extraction efficiency.

[0089] Although not shown, a third passivation layer covering the second electrode 83 can be disposed on the second electrode 83, an encapsulation layer can be disposed on the side surface and the top surface of the third passivation layer, and the encapsulation substrate can be attached to the third passivation layer through the encapsulation layer.

[0090] A voltage can be independently supplied to the first electrode 81 of the light-emitting element 80. Accordingly, the light-emitting element 80 can be independently controlled, and the sub-pixel can generate an independently controlled amount of light. If the charge generation layer 82b is continuously formed between the light-emitting regions EA of adjacent sub-pixels without being cut off, due to the side leakage current flowing through the charge generation layer 82b having a high hole and electron mobility, an unexpected sub-pixel may emit light. For example, even when only the light-emitting element of the blue sub-pixel is driven and the light-emitting elements of the green sub-pixel and the red sub-pixel are not driven, a phenomenon may occur in which even the green sub-pixel and the red sub-pixel emit light. To emit pure blue light, a voltage is applied between the first electrode and the second electrode of the blue sub-pixel, but due to the side leakage current, a phenomenon may occur in which even the red sub-pixel and the green sub-pixel are turned on. If an unexpected sub-pixel emits light in this way, the color gamut may deteriorate, and in particular, when displaying an image with a low gray level, spots or color abnormalities may be visible.

[0091] According to an embodiment of the present disclosure, by disposing the second passivation layer 60 below the second coating layer 70, forming the first trench T11 by etching the second passivation layer 60 below the second trench T21 to increase the depth of the trench below the organic layer 82, and configuring the first tilt surface 60S exposed through the first trench T11 to have a steeper slope compared to the second tilt surface 70S exposed through the second trench T21, at least one layer included in the layer included in the organic layer 82, such as the charge generation layer 82b, can be cut off in a region including the boundary between the first tilt surface 60S and the second tilt surface 70S.

[0092] Determine the thickness of the second passivation layer 60 corresponding to the depth of the first trench T11 and the first inclination angle θ1 of the first inclined surface 60S exposed through the first trench T11, such that when depositing the organic layer 82, the charge generation layer 82b is cut off in the region including the boundary between the first inclined surface 60S and the second inclined surface 70S. The thickness of the second passivation layer 60 and the first inclination angle θ1 can be set to values that can cut off the charge generation layer 82b.

[0093] As another example not shown, in the region including the boundary between the first inclined surface 60S and the second inclined surface 70S, the edge of the first trench T11 can be formed into an undercut structure to be covered by the second coating layer 70. In this case, due to the projection effect caused by the undercut structure, since the charge generation layer 82b is not formed between the first inclined surface 60S and the second inclined surface 70S, the cutting effect can be increased.

[0094] According to an embodiment of the present disclosure, since the charge generation layer 82b is cut off in the region including the boundary between the first inclined surface 60S and the second inclined surface 70S, the lateral leakage current between adjacent sub-pixels can be suppressed. Due to this fact, the unintended sub-pixel light emission can be suppressed, the charge injection efficiency can be improved, and the light emission efficiency can be enhanced. In addition, the color gamut can be improved by preventing color mixing, and when displaying an image with low gray levels, the visual recognition of spots or color abnormalities can be reduced.

[0095] In addition, since there is no need to leave a gap between the first electrode 81 of the light-emitting element and the second trench T21 to suppress the lateral leakage current, the aperture ratio can be increased by increasing the area of the light-emitting region EA. Therefore, the light extraction efficiency is improved, and the amount of light emitted from the display device is increased, thereby improving the brightness. In addition, since sufficient light can be emitted using a low voltage, the power consumption can also be reduced. As the light efficiency is improved, the viewing angle and brightness can be increased, thereby providing a wide viewing angle.

[0096] Figure 5 is a diagram showing that the contour of the organic layer changes according to the inclination angle of the side surface of the trench under the organic layer, and Figure 6 is a diagram showing that the contour of the organic layer changes according to the depth of the trench under the organic layer.

[0097] Refer to Figure 5, when the inclination angle θ of the side surface of the trench T is 65°, the thickness of the organic layer 82 deposited on the side surface of the trench T is the thickest; when the inclination angle θ of the side surface of the trench T is 75°, the thickness of the organic layer 82 deposited on the side surface of the trench T is the second thickest; and when the inclination angle θ of the side surface of the trench T is 90°, the thickness of the organic layer 82 deposited on the side surface of the trench T is the thinnest. In other words, as the inclination angle θ of the side surface of the trench T increases to 65°, 75°, and 90°, the thickness of the organic layer 82 deposited on the side surface of the trench T decreases.

[0098] Refer to Figure 6 , when the depth H of the trench T is 0.69 μm, the thickness of the organic layer 82 deposited on the side surface of the trench T is the thickest; when the depth H of the trench T is 1 μm, the thickness of the organic layer 82 deposited on the side surface of the trench T is the second thickest; and when the depth H of the trench T is 1.5 μm, the thickness of the organic layer 82 deposited on the side surface of the trench T is the thinnest. As the depth H of the trench T increases to 0.69 μm, 1 μm, and 1.5 μm, the thickness of the organic layer 82 deposited on the side surface of the trench T decreases.

[0099] When the inclination angle θ of the side surface of the trench T is large and the depth H of the trench T is deep, the thickness of the organic layer 82 deposited on the side surface of the trench T decreases. Embodiments of the present disclosure can provide the following measures: it is possible to cut off the charge generation layer 82b of the organic layer 82 between adjacent sub-pixels by increasing the depth of the trench arranged below the organic layer 82 between adjacent sub-pixels and increasing the inclination angle of the side surface of the trench, thereby suppressing the lateral leakage current.

[0100] Figures 7A to 7E is a cross-sectional view showing a method of manufacturing a display panel of a display device according to an embodiment of the present disclosure, and shows the manufacturing Figure 3 and Figure 4 method of the display panel of the display device.

[0101] Refer to Figure 7A , a circuit element layer 20 is formed on the substrate 10, and a first passivation layer 30 is formed on the circuit element layer 20. A color filter (not shown) is formed on the first passivation layer 30, and a first coating layer 50 is formed to cover the color filter and the first passivation layer 30. A second passivation layer 60 is formed on the first coating layer 50, and a second coating layer 70 is formed on the second passivation layer 60.

[0102] Refer to Figure 7B , a conductive layer is formed on the second coating layer 70, a mask pattern PR is formed on the conductive layer, and then, the conductive layer is etched by using the mask pattern PR as an etching mask to form a first electrode 81.

[0103] Reference Figure 7C Referring to Figure 7C , the second trench T21 is formed by etching the second coating layer 70 using the mask pattern PR as an etch mask. A dry etching process can be used as the etching process. The second inclined surface 70S of the second coating layer 70 can be exposed through the second trench T21. The second inclined surface 70S has a second inclination angle θ2.

[0104] In an embodiment of the present disclosure, since a separate mask pattern is not used to form the second trench T21, and the second trench T21 is formed by etching the second coating layer 70 using the mask pattern PR used when etching the conductive layer to form the first electrode 81, the number of mask patterns is reduced compared to the case of using a separate mask pattern to form the second trench T21.

[0105] Since the second trench T21 is formed by etching the second coating layer 70 using the mask pattern PR used when forming the first electrode 81, the second trench T21 can be self-aligned with the first electrode 81. In the case where the second coating layer 70 is over-etched during the etching process and thus the first electrode 81 protrudes beyond the second inclined surface 70S, an etching process can also be performed to remove the protruding portion of the first electrode 81.

[0106] Reference Figure 7D Referring to Figure 7D , the first trench T11 is formed by etching the second passivation layer 60 exposed through the second trench T21. Since the first trench T11 is formed by etching the portion of the second passivation layer 60 exposed by the second trench T21, the first trench T11 can be self-aligned with the second trench T21. A wet etching process can be used as the etching process. The first inclined surface 60S of the second passivation layer 60 can be exposed through the first trench T11. The first inclined surface 60S has a first inclination angle θ1. The etching process is controlled such that the first inclination angle θ1 has an inclination angle different from the second inclination angle θ2. The etching process can be controlled such that the first inclination angle θ1 has a value greater than the second inclination angle θ2.

[0107] Although not shown, by over-etching the second passivation layer 60 in the process of etching the second passivation layer 60, the top of the first trench T11 can be made to have a size larger than the bottom of the second trench T21. In this case, an undercut structure can be formed in which the edge of the first trench T11 is covered by the second coating layer 70.

[0108] The mask pattern PR can be formed of a photoresist, and the remaining mask pattern PR after forming the first trench T11 can be removed by a stripping process.

[0109] Reference Figure 7E, an organic layer 82 is formed on the entire surface including a first electrode 81, a first inclined surface 60S of a second passivation layer 60, and a second inclined surface 70S of a second coating layer 70, and a second electrode 83 of a light-emitting element is formed on the organic layer 82.

[0110] The organic layer 82 may have a structure in which a plurality of layers are stacked. For example, the organic layer 82 may have a tandem structure. The organic layer 82 may include a first light-emitting unit, a charge generation layer disposed on the first light-emitting unit, and a second light-emitting unit disposed on the charge generation layer.

[0111] The organic layer 82 is co-deposited for sub-pixels without a projection mask. Although the organic layer 82 is co-deposited for sub-pixels, by forming a first trench T11 in the second passivation layer 60 below the second trench T21 to increase the depth of the trench below the organic layer 82, configuring the first inclined surface 60S exposed through the first trench T11 to have a steeper slope compared to the second inclined surface 70S exposed through the second trench T21, and additionally configuring an undercut structure, at least one layer among the plurality of layers included in the organic layer 82 can be cut in a region including the boundary between the first inclined surface 60S and the second inclined surface 70S. For example, the charge generation layer of the organic layer 82 can be cut.

[0112] After that, although not shown, a third passivation layer covering the second electrode 83 is formed on the second electrode 83, an encapsulation layer for sealing the side surface and the top surface of the third passivation layer is formed, and an encapsulation substrate is attached to the encapsulation layer.

[0113] Figure 8 is a diagram showing an example of a cross-section of a display panel of a display device according to an embodiment of the present disclosure.

[0114] Referring to Figure 8 , a circuit element layer 20 may be disposed on a substrate 10, and a first passivation layer 31 may be disposed on the circuit element layer 20. The first passivation layer 31 may cover the circuit element layer 20.

[0115] A color filter 40 is disposed on the first passivation layer 31, and a first coating layer 51 is disposed on the color filter 40 and the first passivation layer 31. The first coating layer 51 may be formed without a mask to cover the color filter 40 and the first passivation layer 31.

[0116] A second coating layer 71 is disposed on the first coating layer 51. When the second coating layer 71 has an opening between the light-emitting regions EA of adjacent sub-pixels, a first trench T12 is formed. The first trench T12 may have a tapered shape, and its size decreases toward the substrate 10. A side surface (first inclined surface) 71S of the second coating layer 71 may be exposed through the first trench T12.

[0117] The first inclined surface 71S of the second coating layer 71 exposed through the first trench T12 may have a first inclination angle θ1'.

[0118] A second passivation layer 61 is disposed on the second coating layer 71. A second trench T22 exposing the first trench T12 may be formed in the second passivation layer 61. A side surface (second inclined surface) 61S of the second passivation layer 61 may be exposed through the second trench T22.

[0119] The second inclined surface 61S of the second passivation layer 61 exposed through the second trench T22 may have a second inclination angle θ2' different from the first inclination angle θ1'. The second inclination angle θ2' may be greater than the first inclination angle θ1'. The second inclined surface 61S may have a steeper slope compared to the first inclined surface 71S.

[0120] The first trench T12 and the second trench T22 may be formed by an etching process using a single mask.

[0121] When the second coating layer 71 is over-etched due to a difference in etching rate between the second coating layer 71 and the second passivation layer 61, the top of the first trench T12 may have a larger size than the bottom of the second trench T22. In this case, an undercut structure UDC in which the edge of the first trench T12 is covered by the second passivation layer 61 may be formed.

[0122] A first electrode 81 exposing the first trench T12 and the second trench T22 is disposed on the second passivation layer 61. The first electrode 81 may be a pixel electrode or an anode electrode of the light-emitting element 80.

[0123] An organic layer 82 may be disposed on the first electrode 81, the first inclined surface 71S of the second coating layer 71, and the second inclined surface 61S of the second passivation layer 61. The organic layer 82 may be formed for a plurality of sub-pixels in common without a projection mask.

[0124] The organic layer 82 may have a structure in which a plurality of layers are stacked. For example, the organic layer 82 may include: a first light-emitting unit 82a disposed on the first electrode 81, a charge generation layer 82b disposed on the first light-emitting unit 82a, and a second light-emitting unit 82c disposed on the charge generation layer 82b.

[0125] At least one layer of the plurality of layers of the organic layer 82 can be cut in a region including the boundary between the first inclined surface 71S and the second inclined surface 61S. For example, the charge generation layer 82b can be cut in a region including the boundary between the first inclined surface 71S and the second inclined surface 61S. The region including the boundary between the first inclined surface 71S and the second inclined surface 61S can be arranged adjacent to the light-emitting regions EA, and the charge generation layer 82b can be cut between the light-emitting regions EA adjacent to the sub-pixels.

[0126] According to an embodiment of the present disclosure, by disposing the second passivation layer 61 on the second coating layer 71, forming the second trench T22 by etching the second passivation layer 61 on the first trench T12 to increase the depth of the trench under the organic layer 82, configuring the second inclined surface 61S exposed through the second trench T22 to have a steeper slope than the first inclined surface 71S exposed through the first trench T12, and configuring an undercut structure between the first inclined surface 71S and the second inclined surface 61S, at least one layer of the plurality of layers constituting the organic layer 82, such as the charge generation layer 82b, can be cut in a region including the boundary between the first inclined surface 71S and the second inclined surface 61S.

[0127] Determine the thickness of the second passivation layer 61 corresponding to the depth of the second trench T22 and the second inclination angle θ2′ of the second inclined surface 61S exposed through the second trench T22 such that the charge generation layer 82b is cut in a region including the boundary between the first inclined surface 71S and the second inclined surface 61S when the charge generation layer 82b is deposited. The thickness of the second passivation layer 61 and the second inclination angle θ2′ can be set to values that enable the charge generation layer 82b to be cut.

[0128] The second electrode 83 of the light-emitting element 80 can be disposed on the organic layer 82. The second electrode 83 includes a first portion 83a that overlaps the first electrode 81, and a second portion 83b that overlaps the first inclined surface 71S of the second coating layer 71 and the second inclined surface 61S of the second passivation layer 61.

[0129] The first portion 83a of the second electrode 83 can constitute the light-emitting element 80. The light-emitting element 80 can be constituted by the first electrode 81, the first portion 83a of the second electrode 83, and the organic layer 82 disposed therebetween. Light can be generated in the organic layer 82 between the first electrode 81 and the first portion 83a of the second electrode 83 by the difference between the voltage applied to the first electrode 81 and the voltage applied to the second electrode 83.

[0130] A portion of the second part 83b of the second electrode 83 has a slope corresponding to the first inclination angle θ1' of the first inclined surface 71S of the second coating layer 71, and another portion has a slope corresponding to the second inclination angle θ2' of the second inclined surface 61S of the second passivation layer 61. The second part 83b of the second electrode 83 can serve the following functions: reflecting light emitted in the organic layer 82 between the first electrode 81 and the first part 83a of the second electrode 83, and extracting the light to the outside of the display panel. The second part 83b of the second electrode 83 can serve the following functions: increasing the light extraction efficiency by reflecting light generated in the organic layer 82 of the light-emitting region EA.

[0131] Although not shown, a third passivation layer may be disposed on the second electrode 83, an encapsulation layer may be disposed on the third passivation layer, and the encapsulation substrate may be attached to the third passivation layer through the encapsulation layer.

[0132] Figures 9A to 9E is a cross-sectional view showing a method of manufacturing a display panel of a display device according to an embodiment of the present disclosure, and shows the manufacturing Figure 8 method of the display panel of the display device.

[0133] Referring to Figure 9A , a circuit element layer 20 is formed on the substrate 10, and a first passivation layer 31 is formed to cover the circuit element layer 20. A color filter (not shown) is formed on the first passivation layer 31, a first coating layer 51 is formed to cover the color filter and the first passivation layer 31, and a second coating layer 71 is formed on the first coating layer 51.

[0134] Referring to Figure 9B , a second passivation layer 61 is formed on the second coating layer 71, and a mask pattern PR is formed on the second passivation layer 61.

[0135] Referring to Figure 9C , the second passivation layer 61 and the second coating layer 71 are etched by using the mask pattern PR as an etching mask, a first trench T12 is formed in the second coating layer 71, and a second trench T22 is formed in the second passivation layer 61. A dry etching process may be used as the etching method.

[0136] The first trench T12 may have a tapered shape, and its size decreases toward the top surface of the substrate 10. The first inclined surface 71S of the second coating layer 71 may be exposed through the first trench T12. The second inclined surface 61S of the second passivation layer 61 may be exposed through the second trench T22.

[0137] Due to the difference in etching rates between the second coating layer 71 and the second passivation layer 61, the first tilt angle θ1' and the second tilt angle θ2' can have different magnitudes. The second tilt angle θ2' can be greater than the first tilt angle θ1'. That is, the second inclined surface 61S can have a steeper slope than the first inclined surface 71S.

[0138] In addition, when the second coating layer 71 is over-etched due to the difference in etching rates between the second coating layer 71 and the second passivation layer 61, the top of the first trench T12 may have a larger size than the bottom of the second trench T22. Therefore, an undercut structure UDC can be formed in which the edge of the first trench T12 is covered by the second passivation layer 61.

[0139] The mask pattern PR can be formed of photoresist, and the remaining mask pattern PR after forming the first trench T12 and the second trench T22 can be removed by a lift-off process.

[0140] Referring to Figure 9D , a first electrode 81 is formed on the second passivation layer 61. The first electrode 81 is formed by: forming a conductive layer on the second passivation layer 61, forming a mask pattern (not shown) on the conductive layer, and etching the conductive layer using the mask pattern as an etching mask.

[0141] Referring to Figure 9E , an organic layer 82 is formed on the entire surface including the first electrode 81, the first inclined surface 71S of the second coating layer 71, and the second inclined surface 61S of the second passivation layer 61, and a second electrode 83 of the light-emitting element is formed on the organic layer 82.

[0142] The organic layer 82 is co-deposited for the sub-pixels without a projection mask.

[0143] Although the organic layer 82 is co-deposited for the sub-pixels, by forming the second trench T22 in the second passivation layer 61 on the first trench T12 to increase the trench depth under the organic layer 82, configuring the second inclined surface 61S exposed through the second trench T22 to have a steeper slope than the first inclined surface 71S exposed through the first trench T12, and configuring the undercut structure, at least one layer among the plurality of layers included in the organic layer 82 can be cut off in the region including the boundary between the first inclined surface 71S and the second inclined surface 61S. For example, the charge generation layer of the organic layer 82 can be cut off.

[0144] After that, although not shown, a third passivation layer covering the second electrode 83 is formed, an encapsulation layer for sealing the side surface and the top surface of the third passivation layer is formed, and a package substrate is attached to the encapsulation layer.

[0145] Figures 10 to 12 This is a diagram showing a cross-sectional example of a display panel of a display device according to an embodiment of the present disclosure. Figure 10 It shows a region including the light-emitting element 80, Figure 11 it shows a region including circuit elements, and Figure 12 it shows an external part of the display panel.

[0146] Referring to Figures 10 to 12 , the display panel of the display device according to an embodiment of the present disclosure may include a substrate 10.

[0147] A circuit element layer 20 may be disposed on the substrate 10. The circuit element layer 20 may include circuit elements (such as driving transistors, sensing transistors, and storage capacitors) constituting sub-pixels and wirings 21.

[0148] The circuit element layer 20 may include a first conductive layer disposed on the substrate 10. The first conductive layer may include a plurality of wirings 21. The wirings 21 may include data lines, driving voltage lines, and sensing lines. The wirings 21 may be disposed between adjacent light-emitting regions EA.

[0149] The first conductive layer may include a light-blocking layer (not shown) and a bottom electrode 21a of the storage capacitor. The light-blocking layer may be disposed to overlap with the semiconductor pattern of the driving transistor to protect the oxide semiconductor element from external light. The bottom electrode 21a of the storage capacitor may be electrically connected to the gate node of the driving transistor.

[0150] The circuit element layer 20 may include a buffer layer 22. The buffer layer 22 may be disposed on the substrate 10 to cover the wirings 21, the light-blocking layer, and the bottom electrode 21a of the storage capacitor. The buffer layer 22 may not be disposed in the non-active region N / A. In another embodiment, the buffer layer 22 may be omitted.

[0151] Although not shown, the circuit element layer 20 may include an active layer, a gate insulating layer, and a second conductive layer. The second conductive layer may include a gate electrode, a source electrode, a drain electrode, and a top electrode 23 of the storage capacitor. The top electrode 23 of the storage capacitor may be disposed on the buffer layer 22 to overlap with the bottom electrode 21a of the storage capacitor.

[0152] A first passivation layer 32 may be disposed on the circuit element layer 20. The first passivation layer 32 may cover the second conductive layer and the buffer layer 22 not covered by the second conductive layer. The first passivation layer 32 may cover the substrate 10 in the non-active region N / A not covered by the buffer layer 22. In the non-active region N / A, the first passivation layer 32 may contact the top surface of the substrate 10.

[0153] A color filter 40 may be disposed on the first passivation layer 32.

[0154] A second passivation layer 62 may be disposed on the color filter 40 and the first passivation layer 32. The second passivation layer 62 may be disposed on the first passivation layer 32 to cover the color filter 40. The second passivation layer 62 may contact the top surface of the first passivation layer 32 in the non-active region N / A.

[0155] A coating layer 52 may be disposed on the second passivation layer 62. The coating layer 52 may have a thickness greater than that of the first coating layer 50 or the second coating layer 70 described above with reference to Figure 3 and Figure 4 For example, the coating layer 52 may have a thickness corresponding to the sum of the thicknesses of the first coating layer 50 and the second coating layer 70 described above with reference to Figure 3 and Figure 4 A first trench T13 may be defined in the coating layer 52 between the light-emitting regions EA of adjacent sub-pixels. The first trench T13 may expose the side surface (first inclined surface) 52S of the coating layer 52.

[0156] The first trench T13 may have a tapered shape, the size of which decreases towards the substrate 10, and the first inclined surface 52S of the coating layer 52 exposed by the first trench T13 may have an inclination angle θ1" less than 90°.

[0157] A contact hole CH may be formed through the coating layer 52 and the first and second passivation layers 32 and 62 to expose the top electrode 23 of the storage capacitor.

[0158] A first electrode 81 is disposed on the coating layer 52 to expose the first trench T13. The first electrode 81 may extend to the side surface and the bottom surface of the contact hole CH to cover the side surface and the bottom surface of the contact hole CH. The first electrode 81 may be connected to the top electrode 23 of the storage capacitor disposed on the bottom surface of the contact hole CH.

[0159] The first trench T13 may be formed by etching the coating layer 52 not covered by the first electrode 81. In an embodiment, the first trench T13 may be self-aligned with the first electrode 81. Since the first electrode 81 is self-aligned with the first trench T13, the area of the light-emitting region EA can be increased to improve the aperture ratio. The opening width of the first trench T13 may have the same size as the minimum margin between adjacent sub-pixels. Since the first trench T13 is formed to be self-aligned with the first electrode 81, the opening width of the first trench T13 can be set to have the same size as the minimum margin between adjacent sub-pixels.

[0160]

[0161] ​The organic layer 82 may be disposed on the first electrode 81 and the first inclined surface 52S of the coating layer 52. The organic layer 82 may have a structure in which a plurality of layers are stacked. For example, the organic layer 82 may have a tandem structure. The organic layer 82 may include a first light-emitting unit, a charge generation layer disposed on the first light-emitting unit, and a second light-emitting unit disposed on the charge generation layer. The organic layer 82 may be formed for a plurality of sub-pixels in common without a projection mask.

[0162] A second electrode 83 of the light-emitting element 80 may be disposed on the organic layer 82. The second electrode 83 includes a first portion 83a that overlaps with the first electrode 81 and a second portion 83b that overlaps with the first inclined surface 52S of the coating layer 52.

[0163] The first portion 83a of the second electrode 83 may constitute the light-emitting element 80. The light-emitting element 80 may be constituted by the first electrode 81, the first portion 83a of the second electrode 83, and the organic layer 82 disposed therebetween. Light may be generated in the organic layer 82 between the first electrode 81 and the first portion 83a of the second electrode 83 by the difference between the voltage applied to the first electrode 81 and the voltage applied to the second electrode 83.

[0164] The second portion 83b of the second electrode 83 has a slope corresponding to the first inclination angle θ1" of the inclined surface 52S of the coating layer 52. The second portion 83b of the second electrode 83 may function to reflect the light emitted from the organic layer 82 and extract the light to the outside of the display panel. The second portion 83b of the second electrode 83 may function to increase the light extraction efficiency by reflecting the light emitted from the organic layer 82 between the first electrode 81 and the first portion 83a of the second electrode 83.

[0165] A third passivation layer 90 covering the second electrode 83 may be disposed on the second electrode 83, an encapsulation layer 91 may be disposed on the side surface and the top surface of the third passivation layer 90, and the encapsulation substrate 92 may be attached to the third passivation layer 90 through the encapsulation layer 91.

[0166] The encapsulation layer 91 may cover the active region A / A and may extend from the active region A / A to the non-active region N / A. Although not shown, a driving circuit, for example, at least one of a gate driving circuit and a data driving circuit, may be disposed in the non-active region N / A of the display panel, and the encapsulation layer 91 may cover the driving circuit.

[0167] The coating layer 52 is not disposed in the outer portion of the display panel. The encapsulation layer 91 may contact the second passivation layer 62 in the outer portion of the display panel. In the outer portion of the display panel, the first passivation layer 32 may contact the top surface of the substrate 10, and the second passivation layer 62 may contact the top surface of the first passivation layer 32. The first passivation layer 32 and the second passivation layer 62 may extend beyond the end of the encapsulation layer 91 up to the edge of the display panel.

[0168] According to an embodiment of the present disclosure, since the coating layer 52 is not disposed in the outer portion of the display panel, oxygen and / or moisture can be suppressed from penetrating through the coating layer 52 from the outside. Therefore, defects due to oxygen penetration can be prevented, and reliability can be improved.

[0169] Figures 13A to 13E is a cross-sectional view showing a method of manufacturing a display panel of a display device according to an embodiment of the present disclosure, and shows the manufacturing Figures 10 to 12 method of the display panel of the display device.

[0170] Refer to Figure 13A , a circuit element layer is formed on the substrate 10. The circuit element layer may include wirings 21, bottom electrodes 21a of storage capacitors, buffer layers 22, and top electrodes 23 of storage capacitors. Although not shown, the circuit element layer may include an active layer, a gate insulating layer, a gate electrode, a source electrode, and a drain electrode.

[0171] A first passivation layer 32 is formed to cover the circuit element layer. A color filter 40 is formed on the first passivation layer 32, and a second passivation layer 62 is formed to cover the color filter 40 and the first passivation layer 32.

[0172] Refer to Figure 13B , a coating layer 52 is formed on the second passivation layer 62, and a contact hole CH exposing the top electrode 23 of the storage capacitor is formed in the coating layer 52.

[0173] Refer to Figure 13C , a first electrode 81 of a light-emitting element is formed on the coating layer 52. The first electrode 81 is formed by: forming a conductive layer on the coating layer 52, forming a mask pattern PR on the conductive layer, and etching the conductive layer using the mask pattern PR as an etching mask. A wet etching process may be used as the etching process.

[0174] The first electrode 81 may be disposed on the light-emitting region, may extend from the light-emitting region to the contact hole CH formed in the non-light-emitting region, and may be connected to the top electrode 23 of the storage capacitor exposed through the contact hole CH.

[0175] Refer to Figure 13D, the first trench T13 is formed by etching the coating layer 52 using the mask pattern PR as an etch mask. A dry etching process can be used as the etching method.

[0176] The first trench T13 may have a tapered shape, with its width decreasing towards the substrate 10. The side surface (first inclined surface) 52S of the coating layer 52 may be exposed through the first trench T13. The first inclined surface 52S may have a first inclination angle θ1 less than 90°.

[0177] Although not shown, when the coating layer 52 is over-etched during the etching process for forming the first trench T13, the edge of the first electrode 81 may protrude beyond the first inclined surface 52S of the coating layer 52. After forming the first trench T13, an additional etching process may be performed to remove the edge of the first electrode 81 that protrudes beyond the first inclined surface 52S of the coating layer 52.

[0178] The mask pattern PR may be formed of photoresist, and the remaining mask pattern PR after forming the first trench T13 may be removed by a stripping process.

[0179] In an embodiment of the present disclosure, since no separate mask pattern is used to form the first trench T13, and the first trench T13 is formed by etching the coating layer 52 using the mask pattern PR used when etching the conductive layer to form the first electrode 81, the number of mask patterns is reduced compared to the case of using a separate mask pattern to form the first trench T13.

[0180] Refer to Figure 13E , an organic layer 82 is formed on the entire surface including the first electrode 81, the first inclined surface 52S of the coating layer 52, and the side and bottom surfaces of the contact hole CH, and a second electrode 83 of the light-emitting element is formed on the organic layer 82. The organic layer 82 is co-deposited for sub-pixels without a projection mask.

[0181] Although in Figures 10 to 12 and Figures 13A to 13E the second passivation layer 62 under the first trench T13 is not etched, a second trench may be additionally formed by etching the second passivation layer 62 under the first trench T13.

[0182] Figure 14 is a diagram showing a cross-sectional example of a display panel of a display device according to an embodiment of the present disclosure.

[0183] Refer to Figure 14 , when the second passivation layer 62 under the first trench T13 of the coating layer 52 is etched, a second trench T23 may be formed. The second trench T23 may be self-aligned with the first trench T13.

[0184] The side surface (second inclined surface) 62S of the second passivation layer 62 may be exposed through the second trench T23. The first inclined surface 52S of the coating layer 52 exposed through the first trench T13 may have a first inclination angle θ1". The second inclined surface 62S of the second passivation layer 62 exposed through the second trench T23 may have a second inclination angle θ2" different from the first inclination angle θ1". The second inclination angle θ2" may be greater than the first inclination angle θ1". The second inclined surface 62S may have a steeper slope than the first inclined surface 52S.

[0185] Although not shown, when the second passivation layer 62 is over-etched during the process for etching the second passivation layer 62, an undercut structure in which the edge of the second trench T23 is covered with the coating layer 52 may also be formed.

[0186] A first electrode 81 exposing the first trench T13 and the second trench T23 is disposed on the coating layer 52.

[0187] An organic layer 82 may be disposed on the first electrode 81, the first inclined surface 52S of the coating layer 52, and the second inclined surface 62S of the second passivation layer 62. The organic layer 82 may be commonly formed for a plurality of sub-pixels without a projection mask.

[0188] The organic layer 82 may have a structure in which a plurality of layers are stacked. For example, the organic layer 82 may have a tandem structure. The organic layer 82 may include a first light-emitting unit 82a, a charge generation layer 82b disposed on the first light-emitting unit 82a, and a second light-emitting unit 82c disposed on the charge generation layer 82b.

[0189] At least one layer among the plurality of layers included in the organic layer 82 may be cut in a region including the boundary between the first inclined surface 52S and the second inclined surface 62S. For example, the charge generation layer 82b of the organic layer 82 may be cut. The region including the boundary between the first inclined surface 52S and the second inclined surface 62S may be disposed between adjacent light-emitting regions EA, and the charge generation layer 82b may be cut between the light-emitting regions EA of adjacent sub-pixels.

[0190] According to an embodiment of the present disclosure, by disposing a second passivation layer 62 under the coating layer 52, forming a second trench T23 by etching the second passivation layer 62 under the first trench T13 to increase the trench depth under the organic layer 82, configuring the second inclined surface 62S exposed through the second trench T23 to have a steeper slope compared to the first inclined surface 52S exposed through the first trench T13, and additionally configuring an undercut structure in a region including the boundary between the first inclined surface 52S and the second inclined surface 62S, the charge generation layer 82b of the organic layer 82 can be cut off in a region including the boundary between the first inclined surface 52S and the second inclined surface 62S.

[0191] Determine the thickness of the second passivation layer 62 corresponding to the depth of the second trench T23 and the second inclination angle θ2" of the second inclined surface 62S exposed through the second trench T23 such that the charge generation layer 82b is cut off in a region including the boundary between the first inclined surface 52S and the second inclined surface 62S when the charge generation layer 82b is deposited. The thickness of the second passivation layer 62 and the second inclination angle θ2" can be set to values that enable the charge generation layer 82b to be cut off.

[0192] A second electrode 83 of the light-emitting element 80 may be disposed on the organic layer 82. The second electrode 83 includes a first portion 83a overlapping with the first electrode 81, and a second portion 83b overlapping with the first inclined surface 52S of the coating layer 52 and the second inclined surface 62S of the second passivation layer 62.

[0193] The first portion 83a of the second electrode 83 may constitute the light-emitting element 80. The light-emitting element 80 may be composed of the first electrode 81, the first portion 83a of the second electrode 83, and the organic layer 82 disposed therebetween. Light can be generated in the organic layer 82 between the first electrode 81 and the first portion 83a of the second electrode 83 by the difference between the voltage applied to the first electrode 81 and the voltage applied to the second electrode 83.

[0194] The second portion 83b of the second electrode 83 has a slope corresponding to the first inclined surface 52S of the coating layer 52 and the second inclined surface 62S of the second passivation layer 62. The second portion 83b of the second electrode 83 can function to reflect the light emitted in the organic layer 82 between the first electrode 81 and the first portion 83a of the second electrode 83 and extract the light to the outside of the display panel. The second portion 83b of the second electrode 83 can function to increase the light extraction efficiency by reflecting the light generated in the organic layer 82 of the light-emitting region EA.

[0195] Although not shown, a third passivation layer may be disposed on the second electrode 83, an encapsulation layer may be disposed on the third passivation layer, and the encapsulation substrate may be attached to the third passivation layer through the encapsulation layer.

[0196] The display panel according to the embodiment of the present disclosure described above can be briefly described again as follows.

[0197] The display device according to an embodiment of the present disclosure includes a plurality of light-emitting regions corresponding to a plurality of sub-pixels, and the display device includes: a substrate; a circuit element layer disposed on the substrate; a first passivation layer covering the circuit element layer; a first coating layer disposed on the first passivation layer; a second passivation layer disposed on the first coating layer, the second passivation layer having a first trench at a portion between two adjacent light-emitting regions among the plurality of light-emitting regions, the first trench penetrating through the second passivation layer, wherein the second passivation layer includes a first inclined surface exposed by the first trench; a second coating layer disposed on the second passivation layer, the second coating layer having a second trench defined by a second inclined surface of the second coating layer adjacent to the first trench, and the second trench exposes the first trench; a first electrode disposed on the second coating layer and exposing the first trench and the second trench; an organic layer disposed on the first electrode, the first inclined surface, and the second inclined surface; and a second electrode disposed on the organic layer.

[0198] According to an embodiment of the present disclosure, the first inclined surface and the second inclined surface may have different inclination angles.

[0199] According to an embodiment of the present disclosure, the first inclined surface may have a larger inclination angle than the second inclined surface.

[0200] According to an embodiment of the present disclosure, the organic layer may include a plurality of layers, and at least one layer of the plurality of layers may be separated between two adjacent light-emitting regions.

[0201] According to an embodiment of the present disclosure, the organic layer may include a first light-emitting unit, a charge generation layer on the first light-emitting unit, and a second light-emitting unit on the charge generation layer, and the charge generation layer may be separated at a region including a boundary between the first inclined surface and the second inclined surface.

[0202] According to an embodiment of the present disclosure, the second trench may be self-aligned with the first electrode.

[0203] According to an embodiment of the present disclosure, the first trench may be self-aligned with the second trench.

[0204] According to an embodiment of the present disclosure, the display device may further include an undercut structure in which an edge of the first trench is covered by the second coating layer.

[0205] According to an embodiment of the present disclosure, the display device may further include a color filter layer disposed on the first passivation layer, and the first coating layer may be disposed on the color filter layer.

[0206] The display device according to an embodiment of the present disclosure includes a plurality of light-emitting regions corresponding to a plurality of sub-pixels, and the display device includes: a substrate; a circuit element layer disposed on the substrate; a first passivation layer disposed on the circuit element layer; a first coating layer disposed on the first passivation layer; a second coating layer disposed on the first coating layer, the second coating layer having a first trench at a portion between two adjacent light-emitting regions among the plurality of light-emitting regions, the first trench penetrating the second coating layer, wherein the second coating layer includes a first inclined surface exposed by the first trench; a second passivation layer disposed on the second coating layer, the second passivation layer having a second trench defined by a second inclined surface of the second passivation layer adjacent to the first trench, and the second trench exposing the first trench; a first electrode disposed on the second passivation layer and exposing the first trench and the second trench; an organic layer disposed on the first electrode, the first inclined surface, and the second inclined surface; and a second electrode disposed on the organic layer.

[0207] According to an embodiment of the present disclosure, the display device may further include an undercut structure in which an edge of the first trench is covered by the second passivation layer.

[0208] According to an embodiment of the present disclosure, the organic layer may include a plurality of layers, and at least one of the plurality of layers may be separated between two adjacent light-emitting regions adjacent to the sub-pixels.

[0209] According to an embodiment of the present disclosure, the organic layer may include a charge generation layer that is separated in a region including a boundary between the first inclined surface and the second inclined surface.

[0210] According to an embodiment of the present disclosure, the first inclined surface and the second inclined surface have different inclination angles.

[0211] According to an embodiment of the present disclosure, the second inclined surface may have a larger inclination angle than the first inclined surface.

[0212] According to an embodiment of the present disclosure, the display device may further include a color filter layer disposed on the first passivation layer, and the first coating layer may be disposed on the color filter layer.

[0213] A display device according to an embodiment of the present disclosure includes a plurality of light-emitting regions corresponding to a plurality of sub-pixels, and the display device includes: a substrate; a circuit element layer disposed on the substrate; a first passivation layer disposed on the circuit element layer; a color filter layer disposed on the first passivation layer; a second passivation layer covering the color filter layer; a coating layer, the coating layer is disposed on the second passivation layer, the coating layer has a first trench at a portion between two adjacent light-emitting regions among the plurality of light-emitting regions, the first trench has a first inclined surface of the coating layer; a first electrode, the first electrode is disposed on the coating layer and exposes the first trench; an organic layer, the organic layer is disposed on the first electrode and the first inclined surface; and a second electrode disposed on the organic layer.

[0214] According to an embodiment of the present disclosure, the first trench may be self-aligned with the first electrode.

[0215] According to an embodiment of the present disclosure, the display device may further include a second trench defined in the second passivation layer under the first trench.

[0216] According to an embodiment of the present disclosure, the second trench may be self-aligned with the first trench.

[0217] According to an embodiment of the present disclosure, a second inclined surface of the second passivation layer exposed by the second trench may have an inclined angle different from that of the first inclined surface.

[0218] According to an embodiment of the present disclosure, the second inclined surface may have an inclined angle larger than that of the first inclined surface.

[0219] According to an embodiment of the present disclosure, the display device may further include an undercut structure in which an edge of the second trench is covered by the coating layer.

[0220] According to an embodiment of the present disclosure, the organic layer may include a charge generation layer, and the charge generation layer is separated at a region including a boundary between the first inclined surface and the second inclined surface.

[0221] A display device according to an embodiment of the present disclosure includes: a display panel including an active area and a non-active area surrounding the active area, the active area having a plurality of light-emitting areas corresponding to a plurality of sub-pixels; the display panel includes: a substrate; a circuit element layer disposed on the substrate; a first passivation layer disposed on the circuit element layer; a color filter layer disposed on the first passivation layer; a second passivation layer covering the color filter layer; a coating layer disposed on the second passivation layer, the coating layer having a first trench at a portion between two adjacent light-emitting areas among the plurality of light-emitting areas, the first trench having a first inclined surface of the coating layer; a first electrode disposed on the coating layer and exposing the first trench; an organic layer disposed on the first electrode and the first inclined surface; and a second electrode disposed on the organic layer.

[0222] According to an embodiment of the present disclosure, the display device may further include: a third passivation layer covering the second electrode; and a packaging layer disposed on the active area and the non-active area and covering the third passivation layer, and the packaging layer may contact the second passivation layer in an outer portion of the display panel.

[0223] According to an embodiment of the present disclosure, the first passivation layer and the second passivation layer may extend beyond an end of the packaging layer to an edge of the display panel.

[0224] According to an embodiment of the present disclosure, in an outer portion of the display panel, the first passivation layer may contact a top surface of the substrate, and the second passivation layer may contact a top surface of the first passivation layer.

[0225] According to an embodiment of the present disclosure, the display device may further include: a driving circuit disposed in the non-active area of the display panel, and the packaging layer may cover the driving circuit.

[0226] According to an embodiment of the present disclosure, there may be no coating layer in an outer portion of the display panel.

[0227] With such a structure, according to an embodiment of the present disclosure, a display device capable of improving light extraction efficiency and suppressing side leakage current can be provided.

[0228] According to an embodiment of the present disclosure, a display device can be provided that can suppress side leakage current to minimize the light emission of non-intended sub-pixels to improve the color gamut; and can minimize the visual recognition of spots or color abnormalities when displaying low-gray images to improve the display quality.

[0229] According to an embodiment of the present disclosure, a display device can be provided that can improve light extraction efficiency to increase the light emission amount of the display device in order to increase brightness, can emit a sufficient amount of light at a low voltage to reduce power consumption, and can improve light efficiency to increase the viewing angle and brightness in order to provide a wide viewing angle.

[0230] According to an embodiment of the present disclosure, a display device can be provided that can suppress oxygen penetration from the outside to prevent defects caused by oxygen penetration and improve reliability.

[0231] According to an embodiment of the present disclosure, a display device can be provided that can be manufactured at low cost by reducing the number of masks to be used.

[0232] The above description is presented to enable any person skilled in the art to make and use the inventive concept of the present disclosure, and the above description is provided in the context of a particular application and its requirements. Various modifications, additions, and substitutions to the described embodiments will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments and applications without departing from the spirit and scope of the present disclosure. The above description and the drawings provide examples of the inventive concept of the present disclosure for illustrative purposes only. That is, the disclosed embodiments are intended to illustrate the scope of the inventive concept of the present disclosure.

Claims

1. A display device, comprising: Corresponding to a plurality of light-emitting areas of a plurality of sub-pixels, the display device comprises: substrate; a circuit element layer disposed on the substrate; a first passivation layer covering the circuit element layer; a first coating layer disposed on the first passivation layer; a second passivation layer, the second passivation layer being arranged on the first coating layer, the second passivation layer having a first groove at a portion between two adjacent light emitting regions among the plurality of light emitting regions, the first groove passing through the second passivation layer, wherein the second passivation layer includes a first inclined surface exposed by the first groove; a second coating layer disposed on the second passivation layer, the second coating layer having a second groove defined by a second inclined surface of the second coating layer adjacent to the first groove, and the second groove exposing the first groove; a first electrode disposed on the second coating layer and exposing the first groove and the second groove; an organic layer disposed on the first electrode, the first inclined surface, and the second inclined surface; and A second electrode is disposed on the organic layer.

2. The display device according to claim 1, wherein: The first inclined surface and the second inclined surface have different inclination angles.

3. The display device according to claim 1, wherein: The first inclined surface has a larger inclination angle than the second inclined surface.

4. The display device according to claim 1, wherein: The organic layer includes a plurality of layers, and At least one layer of the plurality of layers is separated between the two adjacent light emitting regions.

5. The display device according to claim 1, wherein: The organic layer includes a first light emitting unit, a charge generation layer on the first light emitting unit, and a second light emitting unit on the charge generation layer, and The charge generation layer is separated at a region including a boundary between the first inclined surface and the second inclined surface.

6. The display device according to claim 1, wherein: The second trench is self-aligned with the first electrode.

7. The display device according to claim 1, wherein: The first trench is self-aligned with the second trench.

8. The display device according to claim 1, further comprising: The edge of the first groove is covered by the second coating layer.

9. The display device according to claim 1, further comprising: a color filter layer disposed on the first passivation layer, Wherein, the first coating layer is arranged on the color filter layer.

10. A display device, comprising: Corresponding to a plurality of light-emitting areas of a plurality of sub-pixels, the display device comprises: substrate; a circuit element layer disposed on the substrate; a first passivation layer disposed on the circuit element layer; a first coating layer disposed on the first passivation layer; a second coating layer, the second coating layer being arranged on the first coating layer, the second coating layer having a first groove at a portion between two adjacent light emitting regions among the plurality of light emitting regions, the first groove passing through the second coating layer, wherein the second coating layer includes a first inclined surface exposed by the first groove; a second passivation layer disposed on the second coating layer, the second passivation layer having a second groove defined by a second inclined surface of the second passivation layer adjacent to the first groove, and the second groove exposing the first groove; a first electrode disposed on the second passivation layer and exposing the first trench and the second trench; an organic layer disposed on the first electrode, the first inclined surface, and the second inclined surface; and A second electrode is disposed on the organic layer.

11. The display device according to claim 10, further comprising: An undercut structure in which an edge of the first trench is covered by the second passivation layer.

12. The display device according to claim 10, wherein: The organic layer includes a plurality of layers, and At least one layer of the plurality of layers is separated between the two adjacent light emitting regions.

13. The display device according to claim 10, wherein: The organic layer includes a charge generation layer that is separated at a region including a boundary between the first inclined surface and the second inclined surface.

14. The display device according to claim 10, wherein: The first inclined surface and the second inclined surface have different inclination angles.

15. The display device according to claim 10, wherein: The second inclined surface has an inclination angle greater than that of the first inclined surface.

16. The display device of claim 10, further comprising: a color filter layer disposed on the first passivation layer, Wherein, the first coating layer is arranged on the color filter layer.

17. A display device comprising: Corresponding to a plurality of light-emitting areas of a plurality of sub-pixels, the display device comprises: substrate; a circuit element layer disposed on the substrate; a first passivation layer disposed on the circuit element layer; a color filter layer disposed on the first passivation layer; a second passivation layer covering the color filter layer; a coating layer disposed on the second passivation layer, the coating layer having a first groove at a portion between two adjacent light emitting regions among the plurality of light emitting regions, the first groove having a first inclined surface of the coating layer; a first electrode disposed on the coating layer and exposing the first groove; an organic layer disposed on the first electrode and the first inclined surface; and A second electrode is disposed on the organic layer.

18. The display device according to claim 17, wherein: The first trench is self-aligned with the first electrode.

19. The display device according to claim 17, further comprising: A second trench is defined in the second passivation layer below the first trench.

20. The display device according to claim 19, wherein: The second trench is self-aligned with the first trench.

21. The display device according to claim 19, wherein: A second inclined surface of the second passivation layer exposed by the second trench has an inclination angle different from that of the first inclined surface.

22. The display device according to claim 21, wherein: The second inclined surface has an inclination angle greater than that of the first inclined surface.

23. The display device according to claim 21, further comprising: The edge of the second groove is an undercut structure covered by the coating layer.

24. The display device according to claim 21, wherein: The organic layer includes a charge generation layer that is separated at a region including a boundary between the first inclined surface and the second inclined surface.

25. A display device comprising: A display panel comprising an active area and an inactive area surrounding the active area, wherein the active area has a plurality of light emitting areas corresponding to a plurality of sub-pixels, The display panel comprises: substrate; a circuit element layer disposed on the substrate; a first passivation layer disposed on the circuit element layer; a color filter layer disposed on the first passivation layer; a second passivation layer covering the color filter layer; a coating layer disposed on the second passivation layer, the coating layer having a first groove at a portion between two adjacent light emitting regions among the plurality of light emitting regions, the first groove having a first inclined surface of the coating layer; a first electrode disposed on the coating layer and exposing the first groove; an organic layer disposed on the first electrode and the first inclined surface; and A second electrode is disposed on the organic layer.

26. The display device according to claim 25, further comprising: a third passivation layer covering the second electrode; as well as an encapsulation layer, the encapsulation layer being arranged on the active area and the inactive area and covering the third passivation layer, Wherein, the encapsulation layer contacts the second passivation layer in an outer portion of the display panel.

27. The display device according to claim 26, wherein: The first passivation layer and the second passivation layer extend beyond ends of the encapsulation layer to edges of the display panel.

28. The display device according to claim 25, wherein: In an outer portion of the display panel, the first passivation layer contacts a top surface of the substrate, and the second passivation layer contacts a top surface of the first passivation layer.

29. The display device according to claim 26, further comprising: a driving circuit arranged in an inactive area of ​​the display panel, Wherein, the encapsulation layer covers the driving circuit.

30. The display device according to claim 26, wherein: The coating layer is absent in an outer portion of the display panel.

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