Display device, electronic device and method for manufacturing a display device

Abstract

A display device comprises a substrate in which a light-emitting region is defined, a transistor, a gradient insulating layer, a conductive layer, a flat layer, a pixel electrode, a light-emitting layer, and a common electrode. The transistor is disposed on the substrate and includes a circuit electrode. The gradient insulating layer is disposed on the transistor and includes a first gradient surface and a second gradient surface. A first opening is defined on the first gradient surface, and a second opening is defined on the second gradient surface. A conductive layer is disposed on the gradient insulating layer and the circuit electrode. The conductive layer is electrically connected to the circuit electrode through the first opening. The pixel electrode is disposed on the flat layer and the conductive layer and is in direct contact with the flat layer and the conductive layer. The second opening has an area larger than the first opening and the light-emitting region. The flat layer covers the light-emitting region.

Description

Technology Field

[0001] The present invention relates to a display device, an electronic device, and a method for manufacturing a display device. More specifically, the invention relates to a display device, an electronic device, and a method for manufacturing a display device in which a pixel electrode and a transistor are electrically connected through a conductive layer and a single configuration is placed below the pixel electrode, thereby improving device efficiency and reliability. Background Technology

[0002] Organic light-emitting displays possess self-luminous properties and, unlike liquid crystal display devices, do not require a separate light source, allowing for reduced thickness and weight. Furthermore, organic light-emitting displays exhibit high-quality characteristics such as low power consumption, high brightness, and high response speed.

[0003] Recently, various methods to improve the device efficiency and reliability of display devices are being studied. In particular, research is underway to achieve high resolution. The problem to be solved

[0004] The purpose of the present invention is to provide a display device with improved device efficiency and enhanced reliability.

[0005] The purpose of the present invention is to provide an electronic device with improved device efficiency and enhanced reliability.

[0006] The purpose of the present invention is to provide a method for manufacturing a display device with improved device efficiency and enhanced reliability. means of solving the problem

[0007] A display device according to one embodiment of the present invention may include a substrate, a transistor, a gradient insulating layer, a conductive layer, a flat layer, a pixel electrode, a light-emitting layer, and a common electrode.

[0008] A light-emitting region may be defined on the above substrate.

[0009] The above transistor may be disposed on the substrate and may include circuit electrodes.

[0010] The above gradient insulating layer can be placed on the transistor.

[0011] The above inclined insulating layer may include a first inclined surface with a first opening defined and a second inclined surface with a second opening defined.

[0012] The conductive layer is disposed on the inclined insulating layer and the circuit electrode and can come into direct contact with the circuit electrode.

[0013] The conductive layer can be electrically connected to the circuit electrode through the first opening.

[0014] The flat layer can be disposed on the conductive layer.

[0015] The pixel electrode is disposed on the flat layer and the conductive layer and can be in direct contact with the flat layer and the conductive layer.

[0016] The light-emitting layer can be placed on the pixel electrode.

[0017] The above common electrode can be disposed on the light-emitting layer.

[0018] The first opening, the second opening, and the light-emitting region can overlap on a plane.

[0019] The second opening may have a larger area than the first opening and the light-emitting region.

[0020] The above flat layer can cover the light-emitting region on a plane.

[0021] According to one embodiment, the pixel electrode can cover the flat layer.

[0022] The pixel electrode can be extended parallel to the plane formed by the first direction and the second direction intersecting the first direction.

[0023] According to one embodiment, the conductive layer may include a first contact portion that contacts the pixel electrode.

[0024] The first contact portion above may not overlap with the light-emitting region.

[0025] According to one embodiment, the conductive layer may further include a second contact portion that is spaced apart from the first contact portion and contacts the pixel electrode.

[0026] The second contact portion above may not overlap with the light-emitting region.

[0028] According to one embodiment, the first contact portion and the second contact portion may be arranged to face each other with the flat layer in between.

[0029] According to one embodiment, the conductive layer may include first to third flat portions extending parallel to the substrate.

[0030] The first flat portion above can come into contact with the circuit electrode.

[0031] The second flat portion above can be in contact with the inclined insulating layer and the flat layer.

[0032] The above third flat portion can be in contact with the inclined insulating layer and the pixel electrode.

[0033] According to one embodiment, the first distance between the first flat portion and the substrate may have a value smaller than the second distance between the second flat portion and the substrate.

[0034] The third distance between the third flat portion and the substrate may have a value greater than the second distance.

[0035] According to one embodiment, the upper surface of the third flat portion and the upper surface of the flat layer may form substantially the same plane.

[0036] According to one embodiment, the conductive layer may have an integral shape.

[0037] According to one embodiment, one side of the conductive layer and one side of the pixel electrode can be superimposed on a plane.

[0038] According to one embodiment, one side of the conductive layer and one side of the pixel electrode may be spaced apart from each other.

[0039] According to one embodiment, the gradient insulating layer may include at least one inorganic layer and at least one organic layer.

[0040] According to one embodiment, the inclined insulating layer may further include a third inclined surface in which a third opening is defined.

[0041] The third opening and the first opening can overlap on a plane.

[0042] The third opening may have a larger area than the first opening and a smaller area than the second opening.

[0043] According to one embodiment, the pixel electrode may have a symmetrical shape with respect to a central axis penetrating the pixel in a first direction on a plane.

[0044] A method for manufacturing a display device according to one embodiment of the present invention may include the steps of: preparing a substrate; forming a circuit layer; forming a gradient insulating layer; forming a preliminary conductive layer; forming a flat layer; forming a conductive layer and a pixel electrode; forming a light-emitting layer; and forming a counter electrode.

[0045] A light-emitting region may be defined on the above substrate.

[0046] The above transistor may include circuit electrodes.

[0047] The above inclined insulating layer may include a first inclined surface with a first opening defined and a second inclined surface with a second opening defined.

[0048] In the step of forming the circuit layer, a circuit layer including a transistor can be formed on the substrate.

[0049] In the step of forming the above-mentioned gradient insulating layer, a gradient insulating layer can be formed on the circuit layer.

[0050] In the step of forming the above preliminary conductive layer, a preliminary conductive layer can be formed on the above inclined insulating layer.

[0051] In the step of forming the flat layer above, a flat layer can be formed on the preliminary conductive layer.

[0052] In the step of forming the conductive layer and pixel electrode, the conductive layer and pixel electrode can be formed on the flat layer.

[0053] In the step of forming the light-emitting layer, the light-emitting layer can be formed on the pixel electrode.

[0054] In the step of forming the above-mentioned counter electrode, the counter electrode can be formed on the light-emitting layer.

[0055] The pixel electrode and the conductive layer can be electrically connected to each other.

[0056] The conductive layer and the transistor can be electrically connected to each other through the first opening.

[0057] The second opening may have a larger area than the first opening and the light-emitting region.

[0058] The above flat layer can cover the light-emitting region on a plane.

[0059] In one embodiment, the step of forming the flat layer may include: patterning a second preliminary flat layer on the conductive layer that overlaps with the light-emitting region; and flattening the second preliminary flat layer to form a flat layer.

[0060] In one embodiment, the step of forming the conductive layer and the pixel electrode may include the step of forming a preliminary pixel electrode on the flat layer and the conductive layer; and the step of etching the preliminary pixel electrode and the preliminary conductive layer.

[0061] The above etching step can be performed as a single process.

[0062] A display device according to one embodiment of the present invention may include a substrate, a transistor, a gradient insulating layer, a conductive layer, a flat layer, a pixel electrode, a light-emitting layer, and a common electrode.

[0063] A light-emitting region may be defined on the above substrate.

[0064] The above transistor may be disposed on the substrate and may include circuit electrodes.

[0065] The above gradient insulating layer can be placed on the transistor.

[0066] The conductive layer may include first to third flat portions that are disposed on the inclined insulating layer and extend parallel to the substrate.

[0067] The flat layer can be disposed on the conductive layer.

[0068] The pixel electrode is disposed on the flat layer and the conductive layer and can be in direct contact with the flat layer and the conductive layer.

[0069] The light-emitting layer can be placed on the pixel electrode.

[0070] The above common electrode can be disposed on the light-emitting layer.

[0071] The first flat portion above can come into contact with the circuit electrode.

[0072] The second flat portion can be in direct contact with the inclined insulating layer and the flat layer.

[0073] The third flat portion can be in direct contact with the inclined insulating layer and the pixel electrode.

[0074] The above flat layer can cover the light-emitting region on a plane.

[0075] According to one embodiment, the first distance between the first flat portion and the substrate may have a value smaller than the second distance between the second flat portion and the substrate.

[0076] The third distance between the third flat portion and the substrate may have a value greater than the second distance.

[0077] According to one embodiment, the third flat portion may not overlap with the light-emitting region on a plane.

[0078] According to one embodiment, the inclined insulating layer may include a first inclined surface in which a first opening is defined; and a second inclined surface in which a second opening is defined.

[0079] The conductive layer can be electrically connected to the circuit electrode through the first opening.

[0080] The second opening may have a larger area than the first opening and the light-emitting region.

[0081] The above conductive layer can have a single shape.

[0082] An electronic device according to one embodiment of the present invention may include a substrate, a transistor, a gradient insulating layer, a conductive layer, a flat layer, a pixel electrode, a light-emitting layer, and a common electrode.

[0083] A light-emitting region may be defined on the above substrate.

[0084] The above transistor may be disposed on the substrate and may include circuit electrodes.

[0085] The above gradient insulating layer can be placed on the transistor.

[0086] The above inclined insulating layer may include a first inclined surface with a first opening defined and a second inclined surface with a second opening defined.

[0087] The conductive layer is disposed on the inclined insulating layer and the circuit electrode and can come into direct contact with the circuit electrode.

[0088] The conductive layer can be electrically connected to the circuit electrode through the first opening.

[0089] The flat layer can be disposed on the conductive layer.

[0090] The pixel electrode is disposed on the flat layer and the conductive layer and can be in direct contact with the flat layer and the conductive layer.

[0091] The light-emitting layer can be placed on the pixel electrode.

[0092] The above common electrode can be disposed on the light-emitting layer.

[0093] The first opening, the second opening, and the light-emitting region can overlap on a plane.

[0094] The second opening may have a larger area than the first opening and the light-emitting region.

[0095] The above flat layer can cover the light-emitting region on a plane.

[0096] An electronic device according to one embodiment may further include a processor for controlling the display device; a memory for storing data necessary for the operation of the display device or the processor; and a power conversion module for generating or supplying power. Effects of the invention

[0097] According to an embodiment of the present invention, by electrically connecting a pixel electrode and a transistor through a conductive layer and placing a single configuration below the pixel electrode, the device efficiency and reliability of the display device can be improved. Brief explanation of the drawing

[0098] FIG. 1 is a plan view showing a display device according to one embodiment of the present invention. FIG. 2 is a cross-sectional view showing a part of a display device according to one embodiment. Figure 3 is an enlarged view showing the BB area of ​​Figure 2. Figure 4 is a drawing showing a part of the display device of a comparative example. FIG. 5 is a cross-sectional view showing a part of a display device according to one embodiment. FIG. 6 is a plan view showing some pixels according to one embodiment. FIG. 7 is a cross-sectional view showing a part of a display device of one embodiment. FIG. 8 is a plan view showing a pixel of one embodiment. FIG. 9 is a plan view showing a pixel of one embodiment. FIG. 10 is a plan view showing a pixel of one embodiment. FIG. 11 is a cross-sectional view showing a part of a display device of one embodiment. FIG. 12 is a cross-sectional view showing a part of a display device of one embodiment. FIG. 13 is a plan view showing a part of the display device of a comparative example. FIG. 14 is a plan view showing a part of a display device according to one embodiment of the present invention. FIG. 15 is a flowchart illustrating a method for manufacturing a display device according to one embodiment. FIGS. 16a to 16i are cross-sectional views schematically illustrating the manufacturing steps of a display device. FIG. 17 is a block diagram of an electronic device according to one embodiment. FIGS. 18 to 20 are schematic diagrams of electronic devices according to various embodiments. Specific details for implementing the invention

[0099] In this specification, where a component (or region, layer, part, etc.) is described as being “on,” “connected,” or “joined” another component, it means that it may be directly placed / connected / joined on the other component, or that a third component may be placed between them.

[0100] Identical reference numerals denote identical components. Additionally, in the drawings, the thicknesses, proportions, and dimensions of components are exaggerated for the effective illustration of the technical content. “And / or” includes all one or more combinations that the associated components may define.

[0101] Terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. A singular expression includes a plural expression unless the context clearly indicates otherwise.

[0102] Terms such as "include" or "have" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0103] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Furthermore, terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an overly ideal or overly formal sense unless explicitly defined herein.

[0104] Where any embodiment in this specification can be implemented differently, a specific process sequence may be performed differently from the order described. For example, two processes described consecutively may be performed substantially simultaneously or proceed in the reverse order of the order described.

[0105] First to third directions (DR1, DR2, DR3) may be defined. The first direction (DR1) and the second direction (DR2) may be directions that intersect each other, defined on the plane of the display device (DD) shown in FIG. 1. The third direction (DR3) may be the thickness direction of the display device (DD) defined in FIG. 2.

[0106] In this specification, the expression "on a plane" may mean a direction viewed from a third direction (DR3), that is, a direction viewed from the top to the bottom of the configuration. Additionally, the content described in this specification based on a specific direction may include not only one direction shown in the drawings but also an opposite direction opposite to said one direction.

[0107] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0108] FIG. 1 is a plan view showing a display device according to one embodiment of the present invention. FIG. 2 is a cross-sectional view showing a part of a display device according to one embodiment.

[0109] Referring to FIG. 1, a display device (DD) according to one embodiment may include a display area (DA) and a non-display area (NDA) outside the display area (DA). In FIG. 1, the display area (DA) is shown to have a roughly rectangular shape, but the present invention is not limited thereto. The display area (DA) may be provided in various shapes such as a circle, an ellipse, or a polygon.

[0110] The display area (DA) is a portion for displaying an image, and a plurality of pixels (PX) may be arranged in the display area (DA). Each pixel (PX) may include a light-emitting element such as an organic light-emitting diode (OLED). For example, each pixel (PX) may emit red, green, blue, or white light.

[0111] A display area (DA) can provide a predetermined image through light emitted from a pixel (PX). In this specification, the pixel (PX) may include a light-emitting area that emits light of any one of red, green, blue, or white colors as described above.

[0112] The non-display area (NDA) is an area where pixels (PX) are not placed and may be an area that does not provide an image. In the non-display area (NDA), a printed circuit board including power supply wiring and a driving circuit for driving the pixels (PX), or a terminal section to which a driver IC is connected, may be placed.

[0113] Hereinafter, an organic light-emitting display device is described as an example of a display device (DD) according to one embodiment of the present invention. However, the display device (DD) according to one embodiment of the present invention is not limited thereto. The display device (DD) according to one embodiment may be an inorganic light-emitting display (Inorganic Light Emitting Display or Inorganic EL Display) or a display device such as a quantum dot light-emitting display. For example, the light-emitting layer included in the light-emitting element provided in the display device (DD) may include an organic material or an inorganic material. Additionally, a quantum dot may be located in the path of light emitted from the light-emitting layer.

[0114] Referring to FIG. 2, a display device (DD) according to one embodiment may include a substrate (SS), a buffer layer (BF), a transistor (TFT), a gate insulating film (GI), an interlayer insulating film (LI), a gradient insulating layer (SL), a conductive layer (CDL), a flat layer (PL), a pixel electrode (PE), an emitting layer (EML), a common electrode (CE), and a pixel defining film (PDL).

[0115] The substrate (SS) can be formed from various materials such as glass, metal, or plastic. In one embodiment, the substrate (SS) may be a flexible substrate. For example, the substrate (SS) may include a polymer resin such as polyethersulfone (PES), polyacrylate (PAR), polyetherimide (PEI), polyethylene napthalate (PEN), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyallylate, polyimide (PI), polycarbonate (PC), or cellulose acetate propionate (CAP).

[0116] The buffer layer (BF) can prevent the diffusion of impurity ions onto the upper surface of the substrate (SS), prevent the penetration of moisture or external air, and flatten the surface. In some embodiments, the buffer layer (BF) may be formed from an inorganic material such as silicon oxide, silicon nitride, silicon oxynitride, aluminum oxide, aluminum nitride, titanium oxide, or titanium nitride, or an organic material such as polyimide, polyester, or acrylic, or a laminate thereof.

[0117] A transistor (TFT) may include an active layer (AL) disposed on a substrate (SS), a gate electrode (GE) disposed on at least a portion of the active layer (AL), and circuit electrodes (SD1, SD2) disposed on the gate electrode (GE) and electrically connected to the active layer (AL), respectively. One of the circuit electrodes (SD1, SD2) may be a source electrode and the other may be a drain electrode.

[0118] The active layer (AL) may be disposed on the buffer layer (BF). The active layer (AL) may be an inorganic semiconductor such as amorphous silicon or polysilicon, or an organic semiconductor. In one embodiment, the active layer (AL) may be formed of an oxide semiconductor. The oxide semiconductor may include oxides of materials selected from metal elements of groups 12, 13, and 14 such as zinc (Zn), indium (In), gallium (Ga), tin (Sn), cadmium (Cd), germanium (Ge), or hafnium (Hf), and combinations thereof.

[0119] A gate insulating film (GI) is placed on a buffer layer (BF) and can cover an active layer (AL). A gate electrode (GE) can be placed on the gate insulating film (GI).

[0120] An interlayer insulating film (LI) is placed on a gate insulating film (GI) and a gate electrode (GE) and can cover the gate electrode (GE). Circuit electrodes (SD1, SD2) are formed on the interlayer insulating film (LI) and can each be contacted with an active layer (AL) through a contact hole.

[0121] A gradient insulating layer (SL) may be disposed on a source electrode (SE), a drain electrode (DE), and an interlayer insulating film (LI). In one embodiment, the gradient insulating layer (SL) may include a first inclined surface (S1) with a first opening (OP1) defined therein and a second inclined surface (S2) with a second opening (OP2) defined therein.

[0122] A detailed description of the gradient insulation layer (SL) will be provided later.

[0123] The conductive layer (CDL) can be disposed on the circuit electrode (SD1) and the gradient insulating layer (SL). The conductive layer (CDL) can electrically connect the circuit electrode (SD1) and the pixel electrode (PE), which will be described later, by directly contacting the circuit electrode (SD1) and the pixel electrode (PE).

[0124] A detailed description of the conductive layer (CDL) will be provided later.

[0125] A flat layer (PL) can be disposed on a conductive layer (CDL). The flat layer (PL) can provide a flat surface to a pixel electrode (PE) to be described later.

[0126] A detailed description of the flat layer (PL) will be provided later.

[0127] The pixel electrode (PE) can be placed on the conductive layer (CDL) and the planar layer (PL). The pixel electrode (PE) can be a negative or a positive electrode. The pixel electrode (PE) can be electrically connected to a transistor (TFT) through the conductive layer (CDL).

[0128] In one embodiment, the pixel electrode (PE) can be in direct contact with the conductive layer (CDL) and the flat layer (PL).

[0129] The pixel electrode (PE) may include a conductive oxide such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium oxide (In2O3), indium gallium oxide (IGO), or aluminum zinc oxide (AZO).

[0130] In one embodiment, the pixel electrode (PE) may include a reflective film comprising silver (Ag), magnesium (Mg), aluminum (Al), platinum (Pt), palladium (Pd), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), or a compound thereof.

[0131] In one embodiment, the pixel electrode (PE) may further include a film formed of ITO, IZO, ZnO, or In2O3 above and below the aforementioned reflective film. For example, the pixel electrode (PE) may have a multilayer structure of ITO / Ag / ITO.

[0132] A pixel defining film (PDL) may be disposed on a pixel electrode (PE) and a gradient insulating layer (SL). The pixel defining film (PDL) may include a pixel opening (PDLOP) that defines a light-emitting region (EA). By increasing the distance between the edge of the pixel electrode (PE) and the common electrode (CE), the pixel defining film (PDL) can prevent the occurrence of arcs or the like between them. The pixel defining film (PDL) may be formed from an organic material such as polyimide or HMDSO (hexamethyldisiloxane).

[0133] The emitting layer (EML) may include an organic material comprising a fluorescent or phosphorescent material that emits red, green, blue, or white light. The emitting layer (EML) may be a low-molecular-weight organic material or a high-molecular-weight organic material, and functional layers such as a hole transport layer (HTL), a hole injection layer (HIL), an electron transport layer (ETL), and an electron injection layer (EIL) may be optionally further disposed below and above the emitting layer (EML).

[0134] The common electrode (CE) may be a transparent electrode or a reflective electrode. Alternatively, the common electrode (CE) may be a transparent or translucent electrode and may be formed from a metal thin film comprising Yb, Li, Ca, LiF / Ca, LiF / Al, Al, Ag, Mg, and compounds thereof. Additionally, a transparent conductive oxide (TCO) film, such as ITO, IZO, ZnO, or In2O3, may be further disposed on the metal thin film. The common electrode (CE) is disposed across the display area (DA) and non-display area (NDA) and may be disposed on top of the light-emitting layer (EML) and the pixel defining layer (PDL).

[0135] According to one embodiment, the inclined insulating layer (SL) may include a first inclined surface (S1) and a second inclined surface (S2).

[0136] A first opening (OP1) that exposes either of the circuit electrodes (SD1, SD2) may be defined on the first inclined surface (S1). In FIG. 2, the circuit electrode (SD1) being exposed is illustrated as an example. The first inclined surface (S1) may overlap with the edge of the circuit electrode (SD1) and expose a portion of the upper surface of the circuit electrode (SD1).

[0137] The second inclined surface (S2) may be spaced further from the substrate in the third direction (DR3) compared to the first inclined surface (S1). The second inclined surface (S2) may be spaced from the first inclined surface (S1) in the first direction (DR1). A second opening (OP2) covering the entire light-emitting region (EA) may be defined by the second inclined surface (S2).

[0138] In one embodiment, the first opening (OP1) and the second opening (OP2) are connected, and the second opening (OP2) may be defined above the first opening (OP1).

[0139] In one embodiment, the second opening (OP2) may have a wider width than the first opening (OP1).

[0140] The gradient insulating layer (SL) may include inorganic and / or organic materials.

[0141] FIG. 3 is an enlarged view showing the BB area of ​​FIG. 2. FIG. 4 is a drawing showing a part of the display device of a comparative example. Other components have been omitted in FIG. 3 and FIG. 4 for convenience of explanation.

[0142] Referring to FIG. 3, according to an embodiment of the present invention, the first inclined surface (S1) and the second inclined surface (S2) are spaced apart in a first direction (DR1), so that a conductive layer (CDL) to be described later can be stably formed on the inclined surfaces (S1, S2).

[0143] Referring to FIG. 4, in the display device (DD-P1) of the comparative example, the inclined insulating layer (SL-P) has one inclined surface (SP), and the conductive layer (CDL-P) extends along the inclined surface (SP) at a predetermined angle (θ-P). The predetermined angle (θ-P) is smaller than a predetermined value for the conductive layer (CDL-P) to be stably formed.

[0144] In the display device (DD) of the present invention, the inclined insulating layer (SL) has a first inclined surface (S1) and a second inclined surface (S2) and is formed spaced apart from each other, so that the conductive layer (CDL) can be extended at a first angle (θ-1) from the first inclined surface (S1) and at a second angle (θ-2) from the second inclined surface (S2). The first angle (θ-1) and the second angle (θ-2) can have values ​​relatively larger than the predetermined angle (θ-P) of the comparative example, and the formation of the conductive layer (CDL) can be easily achieved.

[0145] A detailed explanation of the formation process of the conductive layer (CDL) will be provided later.

[0146] Referring to FIG. 2, the first opening (OP1) may be a passage for connecting one of the circuit electrodes (SD1, SD2) of the transistor (TFT) to the pixel electrode (PE).

[0147] According to an embodiment of the present invention, the first opening (OP1) may overlap with the light-emitting region (EA). The first opening (OP1) may be positioned below the light-emitting region (EA) to overlap it so that the light-emitting region (EA) has the maximum area. A detailed explanation thereof will be provided later.

[0148] According to an embodiment of the present invention, the second opening (OP2) can be defined on the second inclined surface (S2), and the second opening (OP2) can cover a light-emitting area (EA) on a plane.

[0149] In one embodiment, the second opening (OP2) may have an area larger than the light-emitting region (EA), and the second opening (OP2) may have an area larger than the first opening (OP1).

[0150] The flat layer (PL) can fill the first opening (OP1) and the second opening (OP2). That is, the flat layer (PL) may be configured to fill the region between the pixel electrode (PE) and the conductive layer (CDL). Since the second opening (OP2) has a larger area than the light-emitting region (EA), the flat layer (PL) filling the second opening (OP2) can cover the light-emitting region (EA) on a plane.

[0151] In this specification, the area of ​​the opening may mean the area defined at the top in the third direction (DR3) of the inclined surface where the opening is defined.

[0152] The conductive layer (CDL) can be placed on either of the circuit electrodes (SD1, SD2) and the gradient insulating layer (SL). The conductive layer (CDL) can electrically connect either of the circuit electrodes (SD1, SD2) and the pixel electrode (PE).

[0153] In one embodiment, the conductive layer (CDL) may be placed directly on the first inclined surface (S1) and the second inclined surface (S2) of the inclined insulating layer (SL).

[0154] In one embodiment, the conductive layer (CDL) may include a first flat portion (F1), a second flat portion (F2), and a third flat portion (F3).

[0155] The first flat portion (F1) can come into direct contact with either of the circuit electrodes (SD1, SD2) at the first opening (OP1).

[0156] The second flat section (F2) is positioned between the inclined insulating layer (SL) and the flat layer (PL) and can come into contact with the inclined insulating layer (SL) and the flat layer (PL).

[0157] The third flat section (F3) is positioned between the inclined insulating layer (SL) and the pixel electrode (PE) and can be in direct contact with the pixel electrode (PE).

[0158] In one embodiment, the third flat portion (F3) may overlap with the pixel defining film (PDL) and may not overlap with the light-emitting region (EA).

[0159] In one embodiment, the first distance (H1) between the first flat section (F1) and the substrate (SS) may have a value smaller than the second distance (H2) between the second flat section (F2) and the substrate (SS).

[0160] In one embodiment, the third distance (H3) between the third flat portion (F3) and the substrate (SS) may have a value greater than the second distance (H2).

[0161] In one embodiment, the upper surface of the third flat portion (F3) and the upper surface of the flat layer (PL) may form substantially the same plane.

[0162] In one embodiment, the conductive layer (CDL) may have a single shape.

[0163] In one embodiment, the conductive layer (CDL) may be formed of a transparent conductive oxide (TCO).

[0164] In one embodiment, according to the method for manufacturing a display device to be described below, the pixel electrode (PE) and the conductive layer (CDL) may be configured such that the preliminary pixel electrode (PPE) and the preliminary conductive layer (PCDL) are each formed by etching them simultaneously in a single process. A single process may refer to a series of processes in which multiple components are formed at once through the same process in substantially one step.

[0165] In the above embodiment, the pixel electrode (PE) and the conductive layer (CDL) are formed through a single process, so that one side (PE-E) of the pixel electrode (PE) in the first direction (DR1) and one side (CDL-E) of the conductive layer (CDL) in the first direction (DR1) can be superimposed on a plane.

[0166] However, the embodiments are not limited thereto, and in other embodiments, when the respective processes for forming the pixel electrode (PE) and the conductive layer (CDL) are performed at different stages, one side of the pixel electrode (PE) and one side of the conductive layer (CDL) in the first direction (DR1) may be spaced apart from each other.

[0167] In an embodiment of the present invention, a flat layer (PL) may be disposed below a pixel electrode (PE) that overlaps with a light-emitting region (EA).

[0168] The display device of the comparative example includes a light-emitting region and a pixel electrode. The lower surface of the pixel electrode overlapping the light-emitting region is in contact with two different layers. In this case, non-uniform light emission occurs in the light-emitting region due to detailed shape differences between the different underlying layers.

[0169] In a display device (DD) according to an embodiment of the present invention, the lower surface of a pixel electrode (PE) superimposed on a light-emitting region (EA) does not come into contact with any other components other than a flat layer (PL). Accordingly, the display device (DD) can emit light uniformly over the entire area of ​​the light-emitting region (EA), and the display quality of the display device (DD) can be improved.

[0170] In one embodiment, the flat layer (PL) may include an inorganic material.

[0171] In one embodiment, the flat layer (PL) may include an organic material.

[0172] In one embodiment, the flat layer (PL) may include a conductive material.

[0173] Although not illustrated, in one embodiment, the flat layer (PL) comprises an inorganic material, and each pixel (PX) may have a different thickness of the flat layer (PL). In the above embodiment, the conductive layer (CDL) may be provided as a reflective film that reflects at least a portion of the light, and the pixel electrode (PE) may be provided as a translucent or transparent film that transmits at least a portion of the light. The thickness of the flat layers (PL) placed in each pixel may differ from pixel to pixel so that the light emitted from each pixel can resonate.

[0174] Although not illustrated, in one embodiment, the flat layer (PL) may include an organic material and may further include a scatterer (not illustrated) that scatters light. In the above embodiment, the conductive layer (CDL) may be provided as a reflective film that reflects at least a portion of the light, and the pixel electrode (PE) may be provided as a translucent or transparent film that transmits at least a portion of the light. The light emitted from each pixel has a wider emission angle, and the side visibility of the display device may be improved.

[0175] FIG. 5 is a cross-sectional view showing a part of a display device (DDa) according to one embodiment.

[0176] Referring to FIG. 5, in one embodiment, the inclined insulating layer (SLa) may include a first inclined surface (S1a), a second inclined surface (S2a), and a third inclined surface (S3a). A first opening (OP1a) may be defined in the first inclined surface (S1a), a second opening (OP2a) may be defined in the second inclined surface (S2a), and a third opening (OP3a) may be defined in the third inclined surface (S3a).

[0177] The area (A3a) of the third opening (OP3a) can have a larger value than the area (A1a) of the first opening (OP1a).

[0178] The area (A2a) of the second opening (OP2a) can have a larger value than the area (A3a) of the third opening (OP3a).

[0179] In the embodiment described with reference to FIG. 5, a sloped insulating layer (SLa) having three sloped surfaces (S1a, S2a, S3a) is shown, but the embodiment is not limited thereto, and depending on the embodiment, the number of sloped surfaces included in the sloped insulating layer can be adjusted to at least two or more.

[0180] FIG. 6 is a plan view showing some pixels (PX) according to one embodiment. In FIG. 6, the pixel electrode (PE) is shown having a rectangular shape, but the present invention is not limited thereto. The pixel electrode (PE) can be provided in various shapes such as circular, elliptical, or polygonal.

[0181] Referring to FIG. 6, in one embodiment, the pixel electrode (PE) and the conductive layer (CDL) may overlap completely on a plane. A third flat portion (F3) is provided along the outer shape of the pixel electrode (PE) so as to be in contact with the pixel electrode (PE). On a plane, the third flat portion (F3) may have a closed-loop shape. In FIG. 6, the third flat portion (F3) is exemplarily illustrated as having a square ring shape.

[0182] However, the embodiments are not limited thereto, and the pixel electrode and the conductive layer may overlap only partially on a plane.

[0183] FIG. 7 is a cross-sectional view showing a part of a display device (DDb) of one embodiment. FIG. 8 is a plan view showing a pixel (PXb) of one embodiment.

[0184] Referring to FIG. 7, in one embodiment, the conductive layer (CDLb) may be disposed on at least some of the inclined surfaces (S1b, S2b, S3b, S4b) of the inclined insulating layer (SL). Specifically, the conductive layer (CDLb) may be disposed on the first inclined surface (S1b) and the second inclined surface (S2b), and may not be disposed on the third inclined surface (S3b) and the fourth inclined surface (S4b).

[0185] Referring to FIG. 8, the conductive layer (CDLb) extends to one side of the first direction (DR1) and may overlap with a part of the pixel electrode (PE) on a plane. The third flat portion (F3b) of the conductive layer (CDLb) in contact with the pixel electrode (PE) may extend along the second direction (DR2) on one side of the pixel (PXb).

[0186] FIG. 9 is a plan view showing a pixel (PXc) of one embodiment. FIG. 10 is a plan view showing a pixel (PXd) of one embodiment.

[0187] Referring to FIG. 9, in one embodiment, the conductive layer (CDLc) extends to both sides of the first direction (DR1) and may overlap with a portion of the pixel electrode (PE) on a plane. The third flat portion (F3c1, F3c2) may include a first sub-flat portion (F3c1) and a second sub-flat portion (F3c2) that are spaced apart from each other with a flat layer (not shown) in between. The conductive layer (CDLc) may come into contact with portions of both ends of the pixel electrode (PE) through the first sub-flat portion (F3c1) and the second sub-flat portion (F3c2).

[0188] Referring to FIG. 10, in one embodiment, the conductive layer (CDLd) extends in a first direction (DR1) and a second direction (DR2), so that the third flat portion (F3d) may overlap with a portion of the edge of the pixel electrode (PE) on a plane. Specifically, in FIG. 10, the third flat portion (F3d) may contact a portion of the side extending from the ends of one side and the other side of the pixel electrode (PE) drawn in a rectangular shape.

[0189] FIG. 11 is a cross-sectional view showing a part of a display device (DDe) of one embodiment.

[0190] Referring to FIG. 11, a gradient insulating layer (SLe) according to one embodiment may include a lower layer (LP) and an upper layer (UP). The lower layer (LP) may include an inorganic material, and the upper layer (UP) may include an organic material. A first opening (OP1) exposing a circuit electrode (SD1) may be defined in the lower layer (LP). The first opening (OP1) may be finely formed by a dry etching process, and the lower layer (LP) may include an inorganic material to perform the dry etching process.

[0191] FIG. 12 is a cross-sectional view showing a part of a display device (DD1) of one embodiment.

[0192] Referring to FIG. 12, in one embodiment, the first light-emitting region (EA1) of the first pixel (PX1') may have a different width from the second light-emitting region (EA2) of the second pixel (PX2'). In cross-section, the first light-emitting region (EA1) may have a relatively larger width than the second light-emitting region (EA2). In cross-section, the width (W1) of the flat layer (PL-1) of the first pixel (PX1') may have a larger value than the width (W2) of the flat layer (PL-2) of the second pixel (PX2'). The pixels (PX) may have different light-emitting efficiencies depending on the corresponding light-emitting element. For example, a pixel corresponding to a light-emitting element that emits blue light may have a relatively lower device efficiency compared to a light-emitting element that emits green light. Alternatively, the visibility perceived by the user may differ depending on the wavelength of light emitted by each pixel (PX). Accordingly, each light-emitting region (EA1, EA2) of the pixels (PX) may have different widths, and accordingly, the widths of the flat layers (PL-1, PL-2) may differ. This display device (DD) may have uniform light-emitting efficiency for each pixel (PX) or provide uniform visibility to the user, thereby improving the display quality of the display device (DD).

[0193] FIG. 13 is a plan view showing a part of a display device of a comparative example. FIG. 14 is a plan view showing a part of a display device according to an embodiment of the present invention.

[0194] Referring to FIG. 13, the pixel electrode (PE-c) included in the display device (DD-P2) of the comparative example overlaps with the light-emitting part (EP) from which light is emitted and the contact part (CNT) for electrically connecting the pixel electrode and the transistor. Since the display device (DD-P2) of the comparative example includes the contact part (CNT) which is not substantially a region from which light is emitted, it is limited in expanding the area of ​​the light-emitting part (EP) corresponding to the actual light-emitting region. In one embodiment, the pixel electrode (PE-c) is asymmetric with respect to a virtual central axis (CA-c) penetrating the pixel electrode (PE-c) on a plane.

[0195] In an embodiment of the present invention, the display device (DD) may be applied to a VR (virtual reality) device and may require a higher PPI (pixels per inch) than the display device of the comparative example. The display device (DD) may require a wide light-emitting area (EA) as possible to secure improved resolution and device efficiency.

[0196] Referring to FIG. 14, in a display device (DD) according to one embodiment of the present invention, a pixel electrode (PE, FIG. 2) and a transistor (TFT, FIG. 2) can be connected through a conductive layer (CDL, FIG. 2). The conductive layer (CDL, FIG. 2) and the transistor (TFT, FIG. 2) can be in contact at the bottom of an area overlapping with a light-emitting region (EA). Accordingly, the display device (DD) does not require a contact portion (CNT, FIG. 13) included in the display device of the comparative example (DD-P2, FIG. 13), and the pixel electrode (PE) can have a shape similar to that of the light-emitting region (EA). The display device (DD) can secure a relatively larger light-emitting area compared to the display device of the comparative example (DD-P2), and accordingly, the device efficiency and / or display quality of the display device (DD) can be improved.

[0197] In one embodiment, the display device (DD) includes an organic light-emitting element and has a relatively large light-emitting area, and can exhibit the same brightness as the display device (DD-P2) of the comparative example even when driven with a relatively small current value. Accordingly, the lifespan of the light-emitting element is improved, and the reliability of the display device (DD) can be improved.

[0198] In one embodiment, a first center (C1) may be defined in the pixel electrode (PE). Here, the first center (C1) may be the geometric center, incenter, circumcenter, incenter, or center of gravity of the pixel electrode (PE).

[0199] The pixel electrode (PE) may have a shape that is symmetric in a plane with respect to a virtual central axis (CA) penetrating the first center (C1). In one embodiment, the shortest distance from the boundary of the light-emitting region (EA) to the boundary of the pixel electrode (PE) in the first direction (DR1) or the second direction (DR2) may be constant in a plane.

[0200] FIG. 15 is a flowchart illustrating a method for manufacturing a display device according to one embodiment. FIG. 16a to 16i are cross-sectional views schematically illustrating the manufacturing steps of a display device, respectively.

[0201] Referring to FIG. 15, a method for manufacturing a display device of one embodiment may include a substrate preparation step (S100), a circuit layer formation step (S110), a gradient insulating layer formation step (S120), a preliminary conductive layer formation step (S130), a flat layer formation step (S140), a pixel electrode formation step (S150), a light-emitting layer formation step (S160), and a common electrode formation step (S170).

[0202] Referring to FIGS. 15 and 16a, in step S100, a substrate (SS) is prepared, and in step S110, a circuit layer (CL) can be formed on the substrate (SS). The circuit layer (CL) may include a buffer layer (BF), a transistor (TFT), a gate insulating film (GI), and an interlayer insulating film (LI). The transistor (TFT) may include circuit electrodes (SD1, SD2), an active layer (AL), and a gate electrode (GE).

[0203] In step S120, a first preliminary flat layer (PSL) can first be formed on the circuit layer (CL). Referring to FIG. 16b, the first preliminary flat layer (PSL) can then be patterned to form a gradient insulating layer (SL). In the process of forming the gradient insulating layer (SL), a halftone mask or a slit mask may be used, but the embodiments are not limited thereto.

[0204] In one embodiment, the inclined insulating layer (SL) may include a first inclined surface (S1) and a second inclined surface (S2).

[0205] A first opening (OP1) that exposes either of the circuit electrodes (SD1, SD2) may be defined on the first inclined surface (S1).

[0206] The second inclined surface (S2) may be formed spaced apart from the first inclined surface (S1) in the first direction (DR1) and spaced further from the substrate (SS) than the first inclined surface (S1) in the third direction (DR3). A second opening (OP2) may be defined in the second inclined surface (S2).

[0207] Referring to FIG. 15 and FIG. 16c, a preliminary conductive layer (PCDL) can be formed in step S130. The preliminary conductive layer (PCDL) can be in contact with either of the circuit electrodes (SD1, SD2) at the first opening (OP1) and can be placed directly on the first inclined surface (S1) and the second inclined surface (S2).

[0208] Referring to FIGS. 15 and FIGS. 16d, in step S140 according to one embodiment, a second preliminary flattening layer (PPL) may first be formed at a position corresponding to a light-emitting region (EA, FIG. 2). In the above embodiment, the second preliminary flattening layer (PPL) may be patterned to correspond to the light-emitting region (EA, FIG. 2) in order to prevent residue from remaining over a wide area during the process of flattening the second preliminary flattening layer (PPL) to be described later. The embodiment is not limited thereto, and in other embodiments, the second preliminary flattening layer (not shown) may be deposited over the entire surface.

[0209] Referring to FIGS. 16d and 16e, the second preliminary planarization layer (PPL) can then be planarized to form a planarization layer (PL). The planarization may be carried out through a Chemical Mechanical Planarization (CMP) process or a dry etching process, but is not limited thereto.

[0210] Referring to FIG. 15 and FIG. 16f, in step S150, a preliminary pixel electrode (PPE) can first be formed on a flat layer (PL) and a preliminary conductive layer (PCDL). Referring to FIG. 16g, a portion of the preliminary pixel electrode (PPE) can then be removed to form a pixel electrode (PE) corresponding to a light-emitting region (EA, FIG. 2). Referring to FIG. 16h, a portion of the preliminary conductive layer (PCDL) can then be removed to form a conductive layer (CDL) corresponding to a light-emitting region (EA, FIG. 2).

[0211] In one embodiment, the step of forming the pixel electrode (PE) and the step of forming the conductive layer (CDL) may be performed as separate processes. However, the embodiment is not limited thereto, and the step of forming the pixel electrode (PE) and the conductive layer (CDL) may be performed simultaneously in a single process. That is, the preliminary conductive layer (PCDL, FIG. 16f) and the preliminary pixel electrode (PPE, FIG. 16f) may be etched together in the same single process to form the conductive layer (CDL, FIG. 16h) and the pixel electrode (PE, FIG. 16h).

[0212] In the above embodiment, for the preliminary conductive layer (PCDL, FIG. 16f) to be etched in the same process as the preliminary pixel electrode (PPE), the preliminary conductive layer (PCDL, FIG. 16f) may include a transparent conductive oxide (TCO), and the process may be a wet etch process.

[0213] Referring to FIGS. 15 and 16i, a pixel defining film (PDL) is subsequently formed on a pixel electrode (PE) and a gradient insulating layer (SL), and in step S160, an emitting layer (EML) can be formed between the pixel defining films (PDL). Then, in step S170, a common electrode (CE) can be formed on the emitting layer (EML) and the pixel defining film (PDL).

[0214] A method for manufacturing a display device according to one embodiment of the present invention may form a slanted insulating layer (SL) having at least two slanted surfaces and may form a conductive layer (CDL) on the slanted insulating layer (SL). The conductive layer (CDL) may come into contact with either of the circuit electrodes (SD1, SD2) through a first opening (OP1) and may come into contact with a pixel electrode (PE). The pixel electrode (PE) and the transistor (TFT) may be electrically connected to each other through the conductive layer (CDL). Since the slanted insulating layer (SL) is formed to have at least two slanted surfaces, the formation of the conductive layer (CDL) can be performed stably, and accordingly, the reliability of the display device (DD) can be improved. Since the slanted insulating layer (SL) is formed to have at least two slanted surfaces, only one of the circuit electrodes (SD1, SD2) may be exposed, and accordingly, the reliability of the display device (DD) can be improved.

[0215] A flat layer (PL) is placed on the entire lower portion of a pixel electrode (PE) that overlaps with a light-emitting region (EA, FIG. 2), so that the display device (DD) can emit light uniformly across the entire light-emitting region (EA), and accordingly, the display quality of the display device (DD) can be improved.

[0216] A display device according to an embodiment of the present invention can be applied to various electronic devices. An electronic device according to one embodiment includes the display device described above and may further include a module or device having additional functions other than the display device.

[0217] FIG. 17 is a block diagram of an electronic device according to one embodiment. Referring to FIG. 17, an electronic device (10) according to one embodiment may include a display module (11), a processor (12), a memory (13), and a power module (14). The electronic device (10) may further include an input module (15), a non-image output module (16) and / or a communication module (17).

[0218] The electronic device (10) can output various information in the form of images through the display module (11). When the processor (12) executes an application stored in memory (13), the image information provided by the application can be provided to the user through the display module (11). The power module (14) may include a power supply module, such as a power adapter or battery device, and a power conversion module that converts the power supplied by the power supply module to generate power necessary for the operation of the electronic device (10). The input module (15) can provide input information to the processor (12) and / or the display module (11). The non-image output module (16) can receive information other than images received from the processor (12), such as sound, haptics, light emission, etc., and provide this information to the user. The communication module (17) is a module responsible for the transmission and reception of information between the electronic device (10) and an external device, and may include a receiving unit and a transmitting unit.

[0219] At least one of each component of the electronic device (10) described above may be included in a display device according to the embodiments described above. Additionally, some of the individual modules functionally included in one module may be included in the display device, while others may be provided separately from the display device. For example, the display device may include a display module (11), and the processor (12), memory (13), and power module (14) may be provided in the form of other devices within the electronic device (10) other than the display device.

[0220] FIGS. 18 to 20 are schematic diagrams of electronic devices according to various embodiments. FIGS. 18 to 20 illustrate examples of various electronic devices to which a display device according to the embodiments is applied.

[0221] FIG. 18 illustrates examples of electronic devices, including a smartphone (10_1a), a tablet PC (10_1b), a laptop (10_1c), a TV (10_1d), and a desktop monitor (10_1e).

[0222] The smartphone (10_1a) may include an input module, such as a touch sensor, and a communication module in addition to the display module (11). The smartphone (10_1a) can process information received through the communication module or other input modules and display information through the display module of the display device.

[0223] In the case of a tablet PC (10_1b), laptop (10_1c), TV (10_1d), and desk monitor (10_1e), it also includes a display module and an input module similar to a smartphone (10_1a), and may additionally include a communication module depending on the case.

[0224] FIG. 19 illustrates a case where an electronic device including a display module is applied to a wearable electronic device. The wearable electronic device may be smart glasses (10_2a), a head-mounted display (10_2b), a smart watch (10_2c), etc.

[0225] Smart glasses (10_2a) and a head-mounted display (10_2b) may include a display module that emits a display image and a reflector that reflects the emitted display screen to provide it to the user's eyes, thereby providing a virtual reality or augmented reality screen to the user.

[0226] The smart watch (10_2c) includes a bio-sensor as an input device and can provide bio-information recognized through the bio-sensor to the user through a display module.

[0227] FIG. 20 illustrates a case where an electronic device including a display module is applied to a vehicle. For example, the electronic device (10_3) may be applied to the instrument panel, center fascia, etc. of a vehicle, or may be applied to a Center Information Display (CID) placed on the dashboard of a vehicle or a room mirror display that replaces a side mirror.

[0228] Although the invention has been described with reference to exemplary embodiments, those skilled in the art will understand that various modifications and changes can be made to the invention without departing from the spirit and scope of the invention as set forth in the following claims. Furthermore, the exemplary embodiments disclosed in the invention are not intended to limit the technical spirit of the invention, and all technical spirits within the scope of the following claims and their equivalents should be interpreted as being included within the scope of the rights of the invention. Explanation of the symbols

[0229] DD: Display device SL: Gradient insulation layer CDL: Conductive layer PL: Flat layer PE: Pixel electrode EML: Emissive layer CE: Common electrode PDL: Pixel Definition Layer EA: Luminous area

Claims

Claim 1 A display device comprising: a substrate having a defined light-emitting region; a transistor disposed on the substrate and including a circuit electrode; an inclined insulating layer disposed on the transistor and including a first inclined surface having a defined first opening and a second inclined surface having a defined second opening; a conductive layer disposed on the inclined insulating layer and the circuit electrode, in direct contact with the circuit electrode and electrically connected to the circuit electrode through the first opening; a flat layer disposed on the conductive layer; a pixel electrode disposed on the flat layer and the conductive layer and in direct contact with the flat layer and the conductive layer; a light-emitting layer disposed on the pixel electrode; and a common electrode disposed on the light-emitting layer, wherein the first opening, the second opening, and the light-emitting region overlap in a plane, the second opening has a larger area than the first opening and the light-emitting region, and the flat layer covers the light-emitting region in a plane. Claim 2 A display device according to claim 1, wherein the pixel electrode covers the flat layer, and the pixel electrode extends parallel to a plane formed by a first direction and a second direction intersecting the first direction. Claim 3 In claim 1, the conductive layer includes a first contact portion that contacts the pixel electrode, and the first contact portion is a display device that does not overlap with the light-emitting region. Claim 4 In claim 3, the conductive layer further comprises a second contact portion spaced apart from the first contact portion and in contact with the pixel electrode, and the second contact portion is a display device that does not overlap with the light-emitting region. Claim 5 In claim 4, the first contact portion and the second contact portion are arranged facing each other with the flat layer in between. Claim 6 A display device according to claim 1, wherein the conductive layer comprises first to third flat portions extending parallel to the substrate, the first flat portion contacts the circuit electrode, the second flat portion contacts the inclined insulating layer and the flat layer, and the third flat portion contacts the inclined insulating layer and the pixel electrode. Claim 7 A display device according to claim 6, wherein the first distance between the first flat portion and the substrate has a value smaller than the second distance between the second flat portion and the substrate, and the third distance between the third flat portion and the substrate has a value larger than the second distance. Claim 8 A display device according to claim 6, wherein the upper surface of the third flat portion and the upper surface of the flat layer form substantially the same plane. Claim 9 In claim 1, the conductive layer is a display device having an integral shape. Claim 10 In claim 1, a display device in which one side of the conductive layer and one side of the pixel electrode overlap on a plane. Claim 11 In claim 1, one side of the conductive layer and one side of the pixel electrode are spaced apart from each other in a display device. Claim 12 In claim 1, the gradient insulating layer comprises at least one inorganic layer and at least one organic layer, forming a display device. Claim 13 A display device according to claim 1, wherein the inclined insulating layer further comprises a third inclined surface in which a third opening is defined, the third opening and the first opening overlap on a plane, and the third opening has an area larger than the first opening and smaller than the second opening. Claim 14 In claim 1, the pixel electrode is a display device having a shape symmetric with respect to a central axis penetrating the pixel in a first direction on a plane. Claim 15 A method for manufacturing a display device comprising the steps of: preparing a substrate having a defined light-emitting region; forming a circuit layer including a transistor on the substrate; forming a sloped insulating layer on the circuit layer including a first sloped surface having a first opening and a second sloped surface having a second opening; forming a preliminary conductive layer on the sloped insulating layer; forming a flat layer on the preliminary conductive layer; forming a conductive layer and a pixel electrode on the flat layer; forming a light-emitting layer on the pixel electrode; and forming a counter electrode on the light-emitting layer, wherein the pixel electrode and the conductive layer are electrically connected to each other, the conductive layer and the transistor are electrically connected to each other through the first opening, the second opening has an area larger than the first opening and the light-emitting region, and the flat layer covers the light-emitting region. Claim 16 A method for manufacturing a display device according to claim 15, wherein the step of forming the flat layer comprises: a step of patterning a second preliminary flat layer on the conductive layer overlapping with the light-emitting region; and a step of flattening the second preliminary flat layer to form a flat layer. Claim 17 A method for manufacturing a display device according to claim 15, wherein the step of forming the conductive layer and the pixel electrode comprises: the step of forming a preliminary pixel electrode on the flat layer and the conductive layer; and the step of etching the preliminary pixel electrode and the preliminary conductive layer, wherein the etching step is performed as a single process. Claim 18 A display device comprising: a substrate having a defined light-emitting region; a transistor disposed on the substrate and including a circuit electrode; a slanted insulating layer disposed on the transistor; a conductive layer disposed on the slanted insulating layer and the circuit electrode and including first to third flat portions extending parallel to the substrate; a flat layer disposed on the conductive layer; a pixel electrode disposed on the flat layer and the conductive layer and in direct contact with the flat layer and the conductive layer; a light-emitting layer disposed on the pixel electrode; and a common electrode disposed on the light-emitting layer, wherein the first flat portion contacts the circuit electrode, the second flat portion contacts the slanted insulating layer and the flat layer in direct contact, the third flat portion contacts the slanted insulating layer and the pixel electrode in direct contact, and the flat layer covers the light-emitting region on a plane. Claim 19 A display device according to claim 18, wherein the first distance between the first flat portion and the substrate has a value smaller than the second distance between the second flat portion and the substrate, and the third distance between the third flat portion and the substrate has a value larger than the second distance. Claim 20 In claim 18, the third flat portion is a display device that does not overlap with the light-emitting region on a plane. Claim 21 In claim 18, the inclined insulating layer comprises a first inclined surface in which a first opening is defined; and a second inclined surface in which a second opening is defined, and the conductive layer is electrically connected to the circuit electrode through the first opening, and the second opening has an area larger than the first opening and the light-emitting region, in a display device. Claim 22 In claim 18, the conductive layer is a display device having an integral shape. Claim 23 An electronic device comprising: a substrate having a defined light-emitting region; a transistor disposed on the substrate and including a circuit electrode; an inclined insulating layer disposed on the transistor and including a first inclined surface having a defined first opening and a second inclined surface having a defined second opening; a conductive layer disposed on the inclined insulating layer and the circuit electrode, in direct contact with the circuit electrode and electrically connected to the circuit electrode through the first opening; a flat layer disposed on the conductive layer; a pixel electrode disposed on the flat layer and the conductive layer and in direct contact with the flat layer and the conductive layer; a light-emitting layer disposed on the pixel electrode; and a common electrode disposed on the light-emitting layer, wherein the first opening, the second opening, and the light-emitting region overlap in a plane, the second opening has a larger area than the first opening and the light-emitting region, and the flat layer covers the light-emitting region in a plane. Claim 24 An electronic device according to claim 23, further comprising: a processor for controlling the display device; a memory for storing data necessary for the operation of the display device or the processor; and a power conversion module for generating or supplying power.

Images