Display device

Abstract

The embodiment of the invention relates to a display device. The light emitting device includes a first electrode layer disposed on a passivation layer including at least one hole in a light emitting region and located in a region other than the at least one hole, or includes a first electrode layer including an upper electrode layer and a lower electrode layer located below the upper electrode layer, a display device capable of improving light extraction efficiency may be provided.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Korean Patent Application No. 10-2023-0157500, filed on November 14, 2023, which is hereby incorporated by reference 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] The organic light emitting display device is a self-luminous display device, and unlike a liquid crystal display device, since a separate light source is not required, it can be manufactured in a lightweight and thin form.

[0005] Organic light emitting display devices not only have advantages in power consumption due to low-power driving, but also have excellent color reproduction, response speed, viewing angle, and contrast. Therefore, organic light emitting display devices are being studied as next-generation displays.

[0006] Light emitted from the light emitting layer of the organic light emitting display device passes through various components of the organic light emitting display device and exits the organic light emitting display device.

[0007] However, among the light emitted from the light emitting layer, there is light that does not exit the organic light emitting display device and is trapped inside the organic light emitting display device, resulting in a problem in light extraction efficiency of the organic light emitting display device.

[0008] In order to improve light extraction efficiency of such an organic light emitting display device, a method of forming a micro lens array (MLA) in an overcoat layer of the organic light emitting display device has been proposed.

[0009] However, although a micro lens array (MLA) is formed in an overcoat layer of an organic light emitting display device, there is a problem in that a large amount of light is trapped inside the organic light emitting display device, and thus the amount of light extracted to the outside is not large.

[0010] Therefore, there is a need for an organic light emitting display device that can improve light emitting efficiency and light extraction efficiency. Summary of the invention

[0011] Embodiments of the present disclosure may provide a display device capable of improving light extraction efficiency.

[0012] Embodiments of the present disclosure may provide a display device capable of low-power driving by recycling light to be extinguished internally.

[0013] According to an embodiment of the present disclosure, a display device may include: a substrate including a light-emitting area and a non-light-emitting area; an outer coating layer disposed on the substrate; a passivation layer disposed on the outer coating layer and including at least one hole in the light-emitting area; a first electrode layer disposed on an upper surface of the passivation layer and located in an area other than the at least one hole; a light-emitting layer disposed on the first electrode layer and covering the outer coating layer and the passivation layer in at least one hole; and a second electrode layer disposed on the light-emitting layer.

[0014] According to an embodiment of the present disclosure, a display device may include: a substrate including a light-emitting area and a non-light-emitting area; an outer coating layer disposed on the substrate; a first electrode layer disposed on the outer coating layer, having at least one hole in the light-emitting area, and including an upper electrode layer and a lower electrode layer located below the upper electrode layer; a light-emitting layer disposed on the first electrode layer and covering the outer coating layer and the first electrode layer in at least one hole; and a second electrode layer disposed on the light-emitting layer.

[0015] According to an embodiment of the present disclosure, a display device may include: a display device including: a substrate; an outer coating layer, the outer coating layer is disposed on the substrate; a passivation layer, the passivation layer is disposed on the outer coating layer and includes at least one hole exposing a portion of the upper surface of the outer coating layer; a first electrode layer, the first electrode layer is disposed on the upper surface of the passivation layer and exposes at least one hole; a light-emitting layer, the light-emitting layer is disposed on the first electrode layer and in the at least one hole; and a second electrode layer, the second electrode layer is disposed on the light-emitting layer.

[0016] According to an embodiment of the present disclosure, a display device capable of improving light extraction efficiency may be provided.

[0017] According to an embodiment of the present disclosure, a display device capable of low-power driving by recycling light to be extinguished internally can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a diagram showing a schematic system configuration of a display device according to an embodiment of the present disclosure.

[0019] Figure 2 is a cross-sectional view of an example of a pixel structure provided in a display panel of a display device according to an embodiment of the present disclosure.

[0020] Figure 3 is a cross-sectional view of an example of a pixel structure provided in a display panel of a display device according to another embodiment of the present disclosure.

[0021] Figure 4is a cross-sectional view of an example of a pixel structure provided in a display panel of a display device according to another embodiment of the present disclosure.

[0022] Figure 5 is a cross-sectional view of an example of a pixel structure provided in a display panel of a display device according to another embodiment of the present disclosure.

[0023] Figure 6 yes Figure 5 Magnified view of area A.

[0024] Figure 7 is a cross-sectional view of an example of a pixel structure provided in a display panel of a display device according to another embodiment of the present disclosure.

[0025] Figure 8 is a cross-sectional view of an example of a pixel structure provided in a display panel of a display device according to another embodiment of the present disclosure. DETAILED DESCRIPTION

[0026] 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 shown by way of illustration, and in the accompanying drawings, the same reference numerals and symbols may be used to represent the same or similar parts, even when these parts are shown in different drawings from each other. In addition, in the following description of examples or embodiments of the present disclosure, when it is determined that the detailed description of the well-known functions and components incorporated herein may make the subject matter in some embodiments of the present disclosure quite unclear, the description will be omitted. Terms such as "including", "having", "comprising", "consisting of", "consisting of", 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.

[0027] 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 is not used to limit the nature, order, sequence or number of elements, etc., but is only used to distinguish the corresponding element from other elements.

[0028] When it is mentioned that a first element is "connected or coupled to" a second element, "contacts or overlaps with" a second element, etc., it should be explained that the first element may not only be "directly connected or coupled to" a second element or "directly contact or overlaps with" a second element, but also a third element may be "inserted" between the first element and the second element, or the first element and the second element may be "connected or coupled to", "contacts or overlaps" 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 to", "contacts or overlaps", etc., each other.

[0029] When time relative terms such as "after", "subsequently", "next", "before", etc. are used to describe a process or operation of an element or configuration, or a flow or step in an operation, process, or manufacturing method, these terms may be used to describe non-sequential or non-sequential processes or operations unless the terms "directly" or "immediately" are used together.

[0030] In addition, when referring to any dimension, relative size, etc., it should be considered that the numerical value or corresponding information (e.g., level, range, etc.) of the element or feature includes tolerances or error ranges that may be caused by various factors (e.g., processing factors, internal or external influences, noise, etc.), even if the relevant description is not specifically stated. In addition, the term "may" fully encompasses all meanings of the term "can".

[0031] Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0032] Figure 1 is a diagram showing a schematic system configuration of a display device according to an embodiment of the present disclosure.

[0033] Reference Figure 1 , a driving system of the display device 100 according to an embodiment of the present disclosure may include a display panel 110 and a display driving circuit for driving the display panel 110 .

[0034] The display panel 110 may include a display area DA where an image is displayed and a non-display area NDA where an image is not displayed.

[0035] The display panel 110 may include a plurality of sub-pixels SP disposed on the substrate 200 to display an image.

[0036] The substrate 200 may include a light emitting region and a non-light emitting region.

[0037] The display panel 110 may include a plurality of signal wirings disposed on the substrate 200 .

[0038] For example, the plurality of signal wirings may include a data line DL, a gate line GL, a driving voltage line, and the like.

[0039] Each of the multiple data lines DL can be configured to extend in a first direction (the column direction in the example, or the row direction in another example), and each of the multiple gate lines GL can be configured to extend in a second direction (the row direction in the example, or the column direction in another example) orthogonal to the first direction.

[0040] The display driving circuit may include a data driving circuit 120 , a gate driving circuit 130 , and a controller 140 .

[0041] The controller 140 may control the data driving circuit 120 and the gate driving circuit 130 .

[0042] The data driving circuit 120 may output data signals corresponding to image signals to the plurality of data lines DL.

[0043] The gate driving circuit 130 may generate a gate signal and output the gate signal to the plurality of gate lines GL.

[0044] The controller 140 may convert the input image data input from the external host 150 to adapt to the data signal format adopted in the data driving circuit 120, and may supply the converted image data Data to the data driving circuit 120. The controller 140 may also supply the data control signal DCS to the data driving circuit 120, and supply the gate control signal GCS to the gate driving circuit 130.

[0045] The data driving circuit 120 may include at least one source driver integrated circuit.

[0046] For example, each source driver integrated circuit can be connected to the display panel 110 in a tape automated bonding (TAB) method, can be connected to a bonding pad of the display panel 110 in a chip on glass (COG) or chip on panel (COP) method, or can be connected to the display panel 110 by being implemented in a chip on film (COF) method.

[0047] The gate driving circuit 130 may be connected to the display panel 110 in a tape automated bonding (TAB) method, may be connected to a bonding pad of the display panel 110 in a COG or COP method, may be connected to the display panel 110 according to a COF method, or may be formed in a non-display area NDA of the display panel 110 in a gate-in-panel (GIP) type.

[0048] Reference Figure 1 , in the display device 100 according to the embodiment of the present disclosure, each sub-pixel SP may include a light emitting element ED and a pixel driving circuit SPC for driving the light emitting element ED.

[0049] The pixel driving circuit SPC may include a driving transistor DRT, a scanning transistor SCT, and a storage capacitor Cst.

[0050] The driving transistor DRT may drive the light emitting element ED by controlling a current flowing to the light emitting element ED.

[0051] The scan transistor SCT may transmit the data voltage Vdata to the second node N2 which is the gate node of the driving transistor DRT.

[0052] The storage capacitor Cst may be configured to maintain a voltage for a predetermined period of time.

[0053] The light emitting element ED may include a first electrode layer 250 , a second electrode layer 280 , and a light emitting layer 270 .

[0054] The light emitting layer 270 is located between the first electrode layer 250 and the second electrode layer 280 .

[0055] The first electrode layer 250 may be a pixel electrode participating in the formation of the light emitting element ED of each sub-pixel SP, and may be electrically connected to the first node N1 of the driving transistor DRT.

[0056] The second electrode layer 280 may be a common electrode participating in the formation of the light emitting elements ED of all sub-pixels SP, and may be applied with a base voltage EVSS.

[0057] 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 (QD) light emitting element.

[0058] 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) as a light emitting element.

[0059] When the display device 100 according to an embodiment of the present disclosure is a quantum dot (QD) light emitting element, each sub-pixel SP may include a light emitting element made of a quantum dot (QD).

[0060] 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) which emits light by itself and is made based on an inorganic material as a light emitting element.

[0061] The driving transistor DRT, which is a transistor for driving the light emitting element ED, may include a first node N1, a second node N2, and a third node N3.

[0062] The first node N1 may be a source node or a drain node and may be electrically connected to the first electrode layer 250 of the light emitting element ED.

[0063] The second node N2 may be a gate node and may be electrically connected to a source node or a drain node of the scan transistor SCT.

[0064] The third node N3 may be a drain node or a source node, and may be electrically connected to a driving voltage line DVL supplying a driving voltage EVDD.

[0065] In this specification, it will be described as an example that the first node N1 is a source node, and the third node N3 is a drain node.

[0066] The scan transistor SCT may switch the connection between the data line DL and the second node N2 of the driving transistor DRT.

[0067] The scan transistor SCT may control connection between the second node N2 of the drive transistor DRT and a corresponding data line DL among the plurality of data lines DL in response to a scan signal SCAN supplied from a scan line SCL as a kind of gate line GL.

[0068] The storage capacitor Cst may be configured between the first node N1 and the second node N2 of the driving transistor DRT.

[0069] Figure 1 The structure of the sub-pixel SP shown is merely an example for illustration, and may further include at least one transistor or at least one capacitor.

[0070] Each of the plurality of sub-pixels SP may have the same structure, and some of the plurality of sub-pixels SP may have different structures.

[0071] Each of the driving transistor DRT and the scanning transistor SCT may be an n-type transistor or a p-type transistor.

[0072] The display device 100 according to an embodiment of the present disclosure may have a top emission structure or a bottom emission structure.

[0073] Hereinafter, in this specification, a bottom emission structure will be described as an example.

[0074] For example, in the case of a bottom emission structure, the first electrode layer 250 may be a conductive material that transmits or semi-transmits light, and the second electrode layer 280 may be a reflective metal.

[0075] Figure 2 is a cross-sectional view of an example of a pixel structure provided in a display panel of a display device according to an embodiment of the present disclosure.

[0076] Reference Figure 2 , a connection pattern 210 electrically connected to the transistor may be provided on the substrate 200 .

[0077] For example, the connection pattern 210 may electrically connect the driving transistor DRT and the light emitting element ED, but is not limited thereto.

[0078] A buffer layer 220 covering the connection pattern 210 may be disposed on the substrate 200 .

[0079] The color filter layer 230 may be disposed on the buffer layer 220 .

[0080] In addition, an overcoat layer 240 covering the color filter layer 230 may be disposed on the buffer layer 220 .

[0081] The outer coating 240 may be a single layer or multiple layers, but in Figure 2 Hereinafter, a display device in which the overcoat layer 240 is composed of two layers will be described as an example.

[0082] When the overcoat layer 240 consists of two layers, the overcoat layer 240 may include a first overcoat layer 241 disposed on the buffer layer 220 and covering the color filter layer 230 , and a second overcoat layer 242 disposed on the first overcoat layer 241 .

[0083] The first outer coating layer 241 and the second outer coating layer 242 may be made of different materials to improve light extraction efficiency.

[0084] For example, the first overcoat layer 241 and the second overcoat layer 242 may be designed to have different refractive indices to improve light extraction efficiency.

[0085] However, embodiments of the present disclosure are not limited thereto, and the first outer coating layer 241 and the second outer coating layer 242 may be made of substantially the same material.

[0086] Substantially the same in the present disclosure may mean the same degree taking into account slight differences due to errors in processing.

[0087] Reference Figure 2 According to the first embodiment of the present disclosure, the display device may include: a passivation layer 300, which is disposed on the outer coating layer 240 and includes at least one hole H in the light emitting area; a first electrode layer 250, which is disposed on the upper surface of the passivation layer 300 and is located in the area except for the at least one hole H; a light emitting layer 270, which is disposed on the first electrode layer 250 and covers the outer coating layer 240 and the passivation layer 300 in the hole H; and a second electrode layer 280, which is disposed on the light emitting layer 270.

[0088] The first electrode layer 250 may include a conductive material that transmits or semi-transmits light.

[0089] For example, the first electrode layer 250 may include at least one type of transparent conductive oxide such as indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), zinc oxide, and tin oxide, or may include a semi-transparent metal such as magnesium, silver, and an alloy of magnesium and silver.

[0090] The light emitting layer 270 of the light emitting element ED may be formed by a deposition or coating method having directionality.

[0091] For example, the light emitting layer 270 may be formed by physical vapor deposition (PVD).

[0092] The light emitting layer 270 may include a red organic light emitting layer disposed in the red sub-pixel (R), a green organic light emitting layer disposed in the green sub-pixel (G), and a blue organic light emitting layer disposed in the blue sub-pixel (B).

[0093] The second electrode layer 280 may include a reflective metal.

[0094] Figure 2 A configuration in which the second electrode layer 280 is a single layer is shown. However, the embodiments of the present disclosure are not limited thereto, and the second electrode layer 280 may be composed of a plurality of layers.

[0095] For example, when the second electrode layer 280 is composed of a plurality of layers, at least one layer may include a reflective metal.

[0096] For example, the second electrode layer 280 may include at least one of aluminum, neodymium, nickel, titanium, tantalum, copper, silver, and an aluminum alloy, but embodiments of the present disclosure are not limited thereto.

[0097] In the display device according to the first embodiment of the present disclosure, since the first electrode layer 250 is located on the upper surface of the passivation layer 300 and in a region other than the at least one hole H, the thickness of the second electrode layer 280 may be prevented from being reduced.

[0098] The passivation layer 300 may use an oxide- or nitride-based material, but is not limited thereto.

[0099] When the thickness of the passivation layer 300 is greater than the thickness of the first electrode layer 250 , it is possible to prevent the thickness of the second electrode layer 280 from being reduced and improve light extraction efficiency.

[0100] The thickness of the passivation layer 300 may be 100 nm to 1000 nm.

[0101] In this manner, by adjusting the thickness of the passivation layer 300 , the depth of the hole H may be adjusted.

[0102] The first embodiment of the present disclosure may further include a contact CNT passing through the passivation layer 300 and the overcoat layer 240 .

[0103] In the contact portion CNT, the first electrode layer 250 and the connection pattern 210 disposed on the substrate 200 may be electrically connected.

[0104] A bank layer 260 disposed on the first electrode layer 250 and filling the contact portion CNT may be further included.

[0105] Figure 3 is a cross-sectional view of an example of a pixel structure provided in a display panel of a display device according to another embodiment of the present disclosure.

[0106] about Figure 3 The details of the substrate 200, the connection pattern 210, the buffer layer 220, the color filter layer 230, the overcoat layer 240, the first electrode layer 250, the bank layer 260, the light emitting layer 270, the second electrode layer 280, the passivation layer 300, the hole H and the contact portion CNT can be the same as those in the above reference. Figure 2 The details described about the substrate 200, the connection pattern 210, the buffer layer 220, the color filter layer 230, the overcoat layer 240, the first electrode layer 250, the bank layer 260, the light emitting layer 270, the second electrode layer 280, the passivation layer 300, the hole H and the contact CNT are substantially the same.

[0107] Reference Figure 3 , the overcoat layer 240 of the display device according to the second embodiment of the present disclosure may include at least one concave portion 400 consisting of a flat portion FLT and an inclined portion SLO surrounding the flat portion FLT.

[0108] The passivation layer 300 may cover the inclined portion SLO and overlap at least a partial region of the flat portion FLT.

[0109] A region of the passivation layer 300 that does not overlap the flat portion FLT may overlap the light emitting layer 270 .

[0110] Since the overcoat layer 240 includes the concave portion 400 , when the passivation layer 300 and the light emitting layer 270 are formed, the passivation layer 300 and the light emitting layer 270 may be formed according to the shape of the concave portion 400 .

[0111] Since the overcoat layer 240 includes the concave portion 400 and the passivation layer 300 includes the hole H, when forming the second electrode layer 280, the second electrode layer 280 may be formed according to the shapes of the concave portion 400 and the hole H. Therefore, the thickness of the second electrode layer 280 may be prevented from being reduced and light extraction efficiency may be improved.

[0112] Figure 4 is a cross-sectional view of an example of a pixel structure provided in a display panel of a display device according to another embodiment of the present disclosure.

[0113] about Figure 4 The details of the substrate 200, the connection pattern 210, the buffer layer 220, the color filter layer 230, the overcoat layer 240, the first electrode layer 250, the light emitting layer 270, the second electrode layer 280, the passivation layer 300, the hole H and the contact portion CNT can be the same as those described above. Figure 2 The details described about the substrate 200, the connection pattern 210, the buffer layer 220, the color filter layer 230, the overcoat layer 240, the first electrode layer 250, the light emitting layer 270, the second electrode layer 280, the passivation layer 300, the hole H, and the contact CNT are substantially the same.

[0114] Reference Figure 4 , in the display device according to the third embodiment of the present disclosure, the light emitting layer 270 and the second electrode layer 280 may be provided in the contact portion CNT according to the shape of the contact portion CNT.

[0115] Therefore, even in the contact portion CNT, the function of the light emitting element ED can be performed.

[0116] Since the second electrode layer 280 is formed according to the shape of the contact portion CNT, light to be extinguished inside may be recycled and may be extracted to the outside.

[0117] In other words, the second electrode layer 280 may perform the function of a micro lens array (MLA).

[0118] However, the embodiments of the present disclosure are not limited thereto, and a micro lens array (MLA) may be formed on the overcoat layer 240 to improve light extraction efficiency.

[0119] The micro lens array (MLA) formed on the overcoat layer 240 may include a reflective metal similar to the second electrode layer 280 .

[0120] In order to increase the area of ​​the second electrode layer 280 and thus improve light extraction efficiency, the overcoat layer 240 composed of at least two layers is preferably formed.

[0121] Figure 5 is a cross-sectional view of an example of a pixel structure provided in a display panel of a display device according to another embodiment of the present disclosure.

[0122] Reference Figure 5 , a connection pattern 210 electrically connected to the transistor may be provided on the substrate 200 .

[0123] For example, the connection pattern 210 may electrically connect the driving transistor DRT and the light emitting element ED, but is not limited thereto.

[0124] A buffer layer 220 covering the connection pattern 210 may be disposed on the substrate 200 .

[0125] The color filter layer 230 may be disposed on the buffer layer 220 .

[0126] In addition, an overcoat layer 240 covering the color filter layer 230 may be disposed on the buffer layer 220 .

[0127] The outer coating 240 may be a single layer or multiple layers, but in Figure 5 Hereinafter, a display device in which the overcoat layer 240 is composed of two layers will be described as an example.

[0128] When the overcoat layer 240 consists of two layers, the overcoat layer 240 may include a first overcoat layer 241 disposed on the buffer layer 220 and covering the color filter layer 230 , and a second overcoat layer 242 disposed on the first overcoat layer 241 .

[0129] The first outer coating layer 241 and the second outer coating layer 242 may be made of different materials to improve light extraction efficiency.

[0130] For example, the first overcoat layer 241 and the second overcoat layer 242 may be designed to have different refractive indices to improve light extraction efficiency.

[0131] However, embodiments of the present disclosure are not limited thereto, and the first outer coating layer 241 and the second outer coating layer 242 may be made of substantially the same material.

[0132] Reference Figure 5 According to the fourth embodiment of the present disclosure, the display device may include: a first electrode layer 250, which is disposed on the outer coating layer 240 and includes at least one hole H in the light-emitting area; a light-emitting layer 270, which is disposed on the first electrode layer 250 and covers the outer coating layer 240 and the first electrode layer 250 in the hole H; and a second electrode layer 280, which is disposed on the light-emitting layer 270.

[0133] The first electrode layer 250 may include a conductive material that transmits or semi-transmits light.

[0134] For example, the first electrode layer 250 may include at least one type of transparent conductive oxide such as indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), zinc oxide, and tin oxide, or may include a semi-transparent metal such as magnesium, silver, and an alloy of magnesium and silver.

[0135] The first electrode layer 250 may include an upper electrode layer 251 and a lower electrode layer 252 located below the upper electrode layer 251 .

[0136] The thickness of the lower electrode layer 252 may be smaller than the thickness of the upper electrode layer 251 .

[0137] If the thickness of the lower electrode layer 252 is smaller than the thickness of the upper electrode layer 251 , when the second electrode layer 280 is formed according to the shape of the hole H, the thickness of the second electrode layer 280 may be prevented from being reduced.

[0138] The lower electrode layer 252 may be formed using a material having an etching rate greater than that of the upper electrode layer 251 .

[0139] For example, the upper electrode layer 251 may be made of ITO, and the lower electrode layer 252 may be made of at least one selected from among a semi-transparent metal or a transparent conductive oxide having a higher etching rate than ITO.

[0140] The lower electrode layer 252 may preferably be made of IZO.

[0141] Since the lower electrode layer 252 is formed using a material having a higher etching rate than the upper electrode layer 251 , the lower electrode layer 252 may be etched more than the upper electrode layer 251 in the etching step to form an undercut UC.

[0142] By forming the undercut UC, when the second electrode layer 280 is formed, the thickness of the second electrode layer 280 may be prevented from being reduced.

[0143] The light emitting layer 270 of the light emitting element ED may be formed by a deposition or coating method having directionality.

[0144] For example, the light emitting layer 270 may be formed by physical vapor deposition (PVD).

[0145] The light emitting layer 270 may include a red organic light emitting layer disposed in the red sub-pixel (R), a green organic light emitting layer disposed in the green sub-pixel (G), and a blue organic light emitting layer disposed in the blue sub-pixel (B).

[0146] The second electrode layer 280 may include a reflective metal.

[0147] Figure 5 A configuration in which the second electrode layer 280 is a single layer is shown. However, the embodiments of the present disclosure are not limited thereto, and the second electrode layer 280 may be composed of a plurality of layers.

[0148] For example, when the second electrode layer 280 is composed of a plurality of layers, at least one layer may include a reflective metal.

[0149] For example, the second electrode layer 280 may include at least one of aluminum, neodymium, nickel, titanium, tantalum, copper, silver, and an aluminum alloy, but embodiments of the present disclosure are not limited thereto.

[0150] Figure 6 yes Figure 5 Magnified view of area A.

[0151] Reference Figure 6 As described above, the lower electrode layer 252 may be disposed below the upper electrode layer 251 .

[0152] In addition, as described above, since the lower electrode layer 252 is formed using a material having a higher etching rate than the upper electrode layer 251 , the lower electrode layer 252 may be etched more than the upper electrode layer 251 in the etching step to form an undercut UC.

[0153] Reference Figure 6 When the second electrode layer 280 is formed according to the shape of the hole H, a recess is formed around the hole H by the taper angle a, and a step D is formed.

[0154] The height of the undercut UC may be adjusted by adjusting the thickness of the lower electrode layer 252 , and the taper angle a and the height of the step D may be adjusted by adjusting the height of the undercut UC.

[0155] A preferred thickness of the lower electrode layer 252 is 100 nm to 500 nm.

[0156] The fourth embodiment of the present disclosure may further include a contact portion CNT passing through the outer coating layer 240 .

[0157] In the contact portion CNT, the first electrode layer 250 and the connection pattern 210 provided on the substrate 200 may be electrically connected.

[0158] A bank layer 260 disposed on the first electrode layer 250 and filling the contact portion CNT may be further included.

[0159] Figure 7 is a cross-sectional view of an example of a pixel structure provided in a display panel of a display device according to another embodiment of the present disclosure.

[0160] about Figure 7 The details of the substrate 200, the connection pattern 210, the buffer layer 220, the color filter layer 230, the overcoat layer 240, the first electrode layer 250, the upper electrode layer 251, the lower electrode layer 252, the bank layer 260, the light emitting layer 270, the second electrode layer 280, the hole H and the contact portion CNT can be the same as those described above. Figure 5The details described about the substrate 200, the connection pattern 210, the buffer layer 220, the color filter layer 230, the outer coating layer 240, the first electrode layer 250, the upper electrode layer 251, the lower electrode layer 252, the embankment layer 260, the light emitting layer 270, the second electrode layer 280, the hole H and the contact portion CNT are basically the same.

[0161] Reference Figure 7 , the overcoat layer 240 of the display device according to the fifth embodiment of the present disclosure may include at least one concave portion 400 consisting of a flat portion FLT and an inclined portion SLO surrounding the flat portion FLT.

[0162] The lower electrode layer 252 may cover the inclined portion SLO and overlap at least a partial region of the flat portion FLT.

[0163] A region of the lower electrode layer 252 that does not overlap the flat portion FLT may overlap the light emitting layer 270 .

[0164] Since the overcoat layer 240 includes the concave portion 400 , when the light emitting layer 270 is formed, the light emitting layer 270 may be formed according to the shape of the concave portion 400 .

[0165] Since the overcoat layer 240 includes the concave portion 400 and the first electrode layer 250 includes the hole H, when forming the second electrode layer 280, the second electrode layer 280 may be formed according to the shapes of the concave portion 400 and the hole H. Therefore, the thickness of the second electrode layer 280 may be prevented from being reduced and light extraction efficiency may be improved.

[0166] Figure 8 is a cross-sectional view of an example of a pixel structure provided in a display panel of a display device according to another embodiment of the present disclosure.

[0167] about Figure 8 The details of the substrate 200, the connection pattern 210, the buffer layer 220, the color filter layer 230, the overcoat layer 240, the first electrode layer 250, the upper electrode layer 251, the lower electrode layer 252, the light emitting layer 270, the second electrode layer 280, the hole H and the contact portion CNT can be the same as those described above. Figure 5 The details described about the substrate 200, the connection pattern 210, the buffer layer 220, the color filter layer 230, the overcoat layer 240, the first electrode layer 250, the upper electrode layer 251, the lower electrode layer 252, the light emitting layer 270, the second electrode layer 280, the hole H and the contact portion CNT are substantially the same.

[0168] Reference Figure 8 , in the display device according to the sixth embodiment of the present disclosure, the light emitting layer 270 and the second electrode layer 280 may be provided in the contact portion CNT according to the shape of the contact portion CNT.

[0169] Therefore, even in the contact portion CNT, the function of the light emitting element ED can be performed.

[0170] Since the second electrode layer 280 is formed according to the shape of the contact portion CNT, light to be extinguished inside may be recycled and may be extracted to the outside.

[0171] In order to increase the area of ​​the second electrode layer 280 and thus improve light extraction efficiency, the overcoat layer 240 composed of at least two layers is preferably formed.

[0172] A brief description of the above-mentioned embodiments of the present disclosure is as follows.

[0173] A display device according to an embodiment of the present disclosure may include: a substrate including a light-emitting area and a non-light-emitting area; an outer coating layer disposed on the substrate; a passivation layer disposed on the outer coating layer and including at least one hole in the light-emitting area; a first electrode layer disposed on an upper surface of the passivation layer and located in an area other than the at least one hole; a light-emitting layer disposed on the first electrode layer and covering the outer coating layer and the passivation layer in at least one hole; and a second electrode layer disposed on the light-emitting layer.

[0174] In the display device according to an embodiment of the present disclosure, the thickness of the passivation layer may be greater than the thickness of the first electrode layer.

[0175] In a display device according to an embodiment of the present disclosure, the display device may further include: a contact portion, which passes through the passivation layer and the outer coating, and the first electrode layer and the connection pattern set on the substrate are electrically connected in the contact portion; and a dam layer, which is set on the first electrode layer and fills the contact portion.

[0176] In a display device according to an embodiment of the present disclosure, the display device may further include: a contact portion that passes through the passivation layer and the outer coating layer, and the first electrode layer and the connection pattern set on the substrate are electrically connected in the contact portion, and the light-emitting layer and the second electrode layer can be set in the contact portion according to the shape of the first electrode layer.

[0177] In the display device according to an embodiment of the present disclosure, the overcoat layer may be configured of at least two layers.

[0178] In the display device according to an embodiment of the present disclosure, the overcoat layer may include at least one recessed portion configured of a flat portion and an inclined portion surrounding the flat portion, and the passivation layer may cover the inclined portion and overlap at least a partial area of ​​the flat portion.

[0179] In a display device according to an embodiment of the present disclosure, the display device may further include: a contact portion, which passes through the passivation layer and the outer coating, and the first electrode layer and the connection pattern set on the substrate are electrically connected in the contact portion; and a dam layer, which is set on the first electrode layer and fills the contact portion.

[0180] A display device according to an embodiment of the present disclosure may include: a substrate including a light-emitting area and a non-light-emitting area; an outer coating layer disposed on the substrate; a first electrode layer disposed on the outer coating layer, having at least one hole in the light-emitting area, and including an upper electrode layer and a lower electrode layer located below the upper electrode layer; a light-emitting layer disposed on the first electrode layer and covering the outer coating layer and the first electrode layer in at least one hole; and a second electrode layer disposed on the light-emitting layer.

[0181] In the display device according to the embodiment of the present disclosure, the thickness of the lower electrode layer may be smaller than the thickness of the upper electrode layer.

[0182] In the display device according to the embodiment of the present disclosure, an etching rate of the lower electrode layer may be higher than an etching rate of the upper electrode layer.

[0183] In the display device according to the embodiment of the present disclosure, the upper electrode layer may include indium tin oxide (ITO), and the lower electrode layer may include at least one selected from among semi-transparent metal or transparent conductive oxide having a higher etching rate than ITO.

[0184] In a display device according to an embodiment of the present disclosure, the display device may further include: a contact portion that passes through the outer coating layer, and in which the first electrode layer and a connection pattern arranged on the substrate are electrically connected; and a dam layer that is arranged on the first electrode layer and fills the contact portion.

[0185] In a display device according to an embodiment of the present disclosure, the display device may further include: a contact portion that passes through the outer coating layer, the first electrode layer and the connection pattern set on the substrate are electrically connected in the contact portion, and the light-emitting layer and the second electrode layer can be set in the contact portion according to the shape of the first electrode layer.

[0186] In the display device according to an embodiment of the present disclosure, the overcoat layer may be configured of at least two layers.

[0187] In the display device according to an embodiment of the present disclosure, the overcoat layer may include at least one recessed portion configured of a flat portion and an inclined portion surrounding the flat portion, and the lower electrode layer may cover the inclined portion and overlap at least a partial area of ​​the flat portion.

[0188] In a display device according to an embodiment of the present disclosure, the display device may further include: a contact portion that passes through the outer coating layer, and in which the first electrode layer and a connection pattern arranged on the substrate are electrically connected; and a dam layer that is arranged on the first electrode layer and fills the contact portion.

[0189] The above description has been presented to enable any person skilled in the art to make and use the technical concept of the present disclosure, and the above description has been provided in the context of a specific 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 may be applied to other embodiments and applications without departing from the spirit and scope of the present disclosure. The above description and accompanying drawings provide examples of the technical concept of the present disclosure for illustrative purposes only. That is, the disclosed embodiments are intended to illustrate the scope of the technical concept of the present disclosure.

Claims

1. A display device, comprising: A substrate, the substrate comprising a light-emitting area and a non-light-emitting area; an outer coating layer disposed on the substrate; a passivation layer disposed on the outer coating layer and comprising at least one hole in the light emitting region; a first electrode layer disposed on an upper surface of the passivation layer and located in a region other than the at least one hole; a light-emitting layer disposed on the first electrode layer and covering the outer coating layer and the passivation layer in the at least one hole; as well as A second electrode layer is disposed on the light-emitting layer.

2. The display device according to claim 1, wherein: The thickness of the passivation layer is greater than the thickness of the first electrode layer.

3. The display device according to claim 1, further comprising: a contact portion, the contact portion passing through the passivation layer and the outer coating layer, wherein the first electrode layer and a connection pattern provided on the substrate are electrically connected in the contact portion; and A bank layer is provided on the first electrode layer and fills the contact portion.

4. The display device according to claim 1, further comprising: a contact portion, the contact portion passing through the passivation layer and the outer coating layer, wherein the first electrode layer and the connection pattern provided on the substrate are electrically connected in the contact portion, The light emitting layer and the second electrode layer are arranged in the contact portion according to the shape of the first electrode layer.

5. The display device according to claim 4, wherein: The outer coating is constructed of at least two layers.

6. The display device according to claim 1, wherein: The outer coating layer includes at least one concave portion constructed of a flat portion and an inclined portion surrounding the flat portion, and The passivation layer covers the inclined portion and overlaps at least a partial area of ​​the planar portion.

7. The display device according to claim 6, further comprising: a contact portion, the contact portion passing through the passivation layer and the outer coating layer, wherein the first electrode layer and a connection pattern provided on the substrate are electrically connected in the contact portion; and A bank layer is provided on the first electrode layer and fills the contact portion.

8. A display device, comprising: A substrate, the substrate comprising a light-emitting area and a non-light-emitting area; an outer coating layer disposed on the substrate; a first electrode layer, the first electrode layer being disposed on the outer coating layer, having at least one hole in the light emitting region, and comprising an upper electrode layer and a lower electrode layer located below the upper electrode layer; a light-emitting layer disposed on the first electrode layer and covering the outer coating layer and the first electrode layer in the at least one hole; as well as A second electrode layer is disposed on the light-emitting layer.

9. The display device according to claim 8, wherein: The thickness of the lower electrode layer is smaller than the thickness of the upper electrode layer.

10. The display device according to claim 8, wherein: The etching rate of the lower electrode layer is higher than the etching rate of the upper electrode layer.

11. The display device according to claim 10, wherein: The upper electrode layer includes indium tin oxide (ITO), and the lower electrode layer includes at least one selected from a transparent conductive oxide or a semi-transparent metal having a higher etching rate than the ITO.

12. The display device according to claim 10, further comprising: a contact portion passing through the outer coating layer, wherein the first electrode layer and a connection pattern provided on the substrate are electrically connected in the contact portion; and A bank layer is provided on the first electrode layer and fills the contact portion.

13. The display device according to claim 10, further comprising: a contact portion, the contact portion passing through the outer coating layer, wherein the first electrode layer and the connection pattern provided on the substrate are electrically connected in the contact portion, The light emitting layer and the second electrode layer are arranged in the contact portion according to the shape of the first electrode layer.

14. The display device according to claim 13, wherein: The outer coating is constructed of at least two layers.

15. The display device according to claim 10, wherein: The outer coating layer includes at least one concave portion constructed of a flat portion and an inclined portion surrounding the flat portion, and The lower electrode layer covers the inclined portion and overlaps with at least a partial area of ​​the flat portion.

16. The display device according to claim 15, further comprising: a contact portion, the contact portion passing through the outer coating layer, the first electrode layer and the connection pattern disposed on the substrate being electrically connected in the contact portion; as well as A bank layer is provided on the first electrode layer and fills the contact portion.

17. A display device comprising: substrate; an outer coating layer disposed on the substrate; a passivation layer disposed on the outer coating layer and comprising at least one hole exposing a portion of an upper surface of the outer coating layer; a first electrode layer disposed on an upper surface of the passivation layer and exposing the at least one hole; a light-emitting layer, the light-emitting layer being disposed on the first electrode layer and in the at least one hole; as well as A second electrode layer is disposed on the light-emitting layer.

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