Display device and manufacturing method thereof

Abstract

The present invention relates to a display device and a manufacturing method thereof. The display device includes: a substrate including a display area and a non-display area surrounding the display area; a display element layer disposed on the substrate. The display element layer includes: a first electrode and a second electrode respectively extending along a first direction and spaced apart from each other along a second direction different from the first direction; a first light-emitting element electrically connected to the first electrode and the second electrode; a first dummy electrode extending along the first direction and spaced apart from the first electrode and the second electrode; a second dummy electrode spaced apart from each other along the first direction and spaced apart from the first electrode, the second electrode and the first dummy electrode; a second light-emitting element electrically connected to the first dummy electrode and the second dummy electrode. The non-display area includes a dummy area located on at least one side of the display area, the first electrode, the second electrode and the first light-emitting element are disposed in the display area, and the first dummy electrode, the second dummy electrode and the second light-emitting element are disposed in the dummy area.

Description

Technical Field

[0001] The present invention relates to a display device and a method of manufacturing the display device. Background Art

[0002] A light emitting diode (hereinafter referred to as an LED) exhibits relatively good durability even under harsh environmental conditions, and also has excellent performance in terms of lifespan and brightness. Recently, research has been actively conducted on applying such LEDs to various display devices.

[0003] As part of such research, a technique for manufacturing ultra-small rod-shaped LEDs with a size on the order of micrometers or nanometers using an inorganic crystal structure (as an example, a structure for growing a nitride-based semiconductor) is being developed. As an example, the rod-shaped LED can be manufactured to a relatively small size such as that capable of forming a pixel of a self-emitting display device. Summary of the Invention

[0004] The problem to be solved by the present invention is to provide a display device and a method of manufacturing the display device that can easily measure the contact resistance of a light emitting element.

[0005] A display device according to an embodiment of the present invention may include: a substrate including a display area and a non-display area surrounding the display area; and a display element layer disposed on the substrate. The display element layer may include: a first electrode and a second electrode extending along a first direction and spaced apart from each other in a second direction different from the first direction; a first light emitting element electrically connected to the first electrode and the second electrode; a first dummy electrode extending along the first direction and spaced apart from the first electrode and the second electrode; a second dummy electrode spaced apart from each other along the first direction and spaced apart from the first electrode, the second electrode, and the first dummy electrode; and a second light emitting element electrically connected to the first dummy electrode and the second dummy electrode. The non-display area may include a dummy area located on at least one side of the display area, the first electrode, the second electrode, and the first light emitting element are disposed on the display area, and the first dummy electrode, the second dummy electrode, and the second light emitting element are disposed on the dummy area.

[0006] In an embodiment of the present invention, the first electrode may include a first protrusion protruding toward the second electrode, the second electrode includes a second protrusion protruding toward the first electrode, and the first light emitting element is disposed between the first protrusion and the second protrusion.

[0007] In an embodiment of the present invention, the second light emitting element may be disposed between each of the second dummy electrodes and the first dummy electrode.

[0008] In an embodiment of the present invention, the first dummy electrode may include a first dummy protrusion protruding toward each of the second dummy electrodes, and each of the second dummy electrodes includes a second dummy protrusion protruding toward the first dummy electrode.

[0009] In an embodiment of the present invention, the first dummy protrusion may have a planar shape corresponding to the planar shape of the first protrusion, and the second dummy protrusion has a planar shape corresponding to the planar shape of the second protrusion.

[0010] In an embodiment of the present invention, the planar shape of the first dummy protrusion may be different from the planar shape of the first protrusion, and the planar shape of the second dummy protrusion is different from the planar shape of the second protrusion.

[0011] In an embodiment of the present invention, the second light-emitting element may be disposed between the first dummy protrusion and the second dummy protrusion.

[0012] In an embodiment of the present invention, the dummy region may include sub-dummy regions spaced apart from each other along the first direction, and the second light-emitting element is disposed in each of the sub-dummy regions.

[0013] In an embodiment of the present invention, the shapes of the first dummy protrusion and the second dummy protrusion provided in at least one of the sub-dummy regions may be different from the shapes of the first dummy protrusion and the second dummy protrusion provided in the remaining regions of the sub-dummy regions.

[0014] In an embodiment of the present invention, the distance between the first dummy protrusion and the second dummy protrusion provided in at least one of the sub-dummy regions and spaced apart from each other along the second direction may be different from the distance between the first dummy protrusion and the second dummy protrusion provided in the remaining regions of the sub-dummy regions and spaced apart from each other along the second direction.

[0015] In an embodiment of the present invention, the width of the portion of the first dummy protrusion facing the second dummy protrusion in the plane provided in at least one of the sub-dummy regions may be different from the width of the portion of the first dummy protrusion facing the second dummy protrusion in the plane provided in the remaining regions of the sub-dummy regions.

[0016] In an embodiment of the present invention, the first dummy electrode may include first sub-dummy electrodes spaced apart from each other along the first direction, and the second light-emitting element is disposed between each of the first sub-dummy electrodes and each of the second dummy electrodes.

[0017] In an embodiment of the present invention, the display element layer may further include: a first dummy pad electrically connected to the first dummy electrode; and a second dummy pad electrically connected to each of the second dummy electrodes.

[0018] In an embodiment of the present invention, the display element layer may further include: a first dummy contact electrode covering at least a portion of the first dummy electrode and electrically connecting the first dummy electrode to the second light-emitting element; and a second dummy contact electrode covering at least a portion of the second dummy electrode and electrically connecting the second dummy electrode to the second light-emitting element.

[0019] A method of manufacturing a display device according to an embodiment of the present invention may include the following steps: forming a first electrode, a second electrode, a first dummy electrode, and a second dummy electrode on a substrate, the first electrode, the second electrode, the first dummy electrode, and the second dummy electrode extending in a first direction and being spaced apart from each other in a second direction different from the first direction; disposing a light-emitting element on the substrate including the first electrode, the second electrode, the first dummy electrode, and the second dummy electrode; applying an alignment signal to the first electrode and the second electrode to align a first light-emitting element between the first electrode and the second electrode, and applying an alignment signal to the first dummy electrode and the second dummy electrode to align a second light-emitting element between the first dummy electrode and the second dummy electrode; forming second sub-dummy electrodes spaced apart from each other in the first direction by cutting the second dummy electrode; forming a first dummy contact electrode electrically connecting the first dummy electrode to the second light-emitting element and a second dummy contact electrode electrically connecting the second sub-dummy electrode to the second light-emitting element; and measuring a contact resistance of the second light-emitting element. The substrate may include a display area and a non-display area surrounding the display area, the non-display area including a dummy area located on at least one side of the display area, the first electrode, the second electrode, and the first light-emitting element being disposed on the display area, and the first dummy electrode, the second dummy electrode, and the second light-emitting element being disposed on the dummy area.

[0020] In an embodiment of the present invention, the second light-emitting element may be disposed between each of the second sub-dummy electrodes and the first dummy electrode.

[0021] In an embodiment of the present invention, in the step of forming the first dummy electrode and the second dummy electrode, a first dummy protrusion protruding toward the second dummy electrode may be formed on the first dummy electrode, and a second dummy protrusion protruding toward the first dummy electrode may be formed on the second dummy electrode.

[0022] In an embodiment of the present invention, in the step of cutting the second dummy electrode, the second dummy electrode may be cut in such a way that one second dummy protrusion is provided on each of the second sub-dummy electrodes, so that the second light-emitting element is provided between the first dummy protrusion and the second dummy protrusion.

[0023] In an embodiment of the present invention, in the step of forming the first dummy electrode and the second dummy electrode, a first dummy pad electrically connected to the first dummy electrode and a second dummy pad electrically connected to the second dummy electrode may be formed. In the step of cutting the second dummy electrode, the second dummy electrode may be cut in such a way that one second dummy pad is provided on each of the second sub-dummy electrodes.

[0024] In an embodiment of the present invention, in the step of measuring the contact resistance of the second light-emitting element, a test signal may be applied to each of the first dummy pad and the second dummy pad, and the signal output from the second light-emitting element may be measured.

[0025] According to an embodiment of the present invention, a display device and a manufacturing method thereof that can easily measure the contact resistance of a light-emitting element may be provided.

[0026] According to an embodiment of the present invention, by using the dummy electrode provided in the dummy region and the second light-emitting element, it is possible to easily measure the resistance of each light-emitting element.

[0027] However, the effects of the present invention are not limited to the above effects, and various expansions can be achieved without departing from the spirit and scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1a And Figure 1b is a perspective view showing a light-emitting element according to an embodiment of the present invention.

[0029] Figure 2a And Figure 2b is a circuit diagram showing a unit light-emitting region of a display device according to an embodiment of the present invention.

[0030] Figure 3 is a plan view showing a display device according to an embodiment of the present invention.

[0031] Figure 4 is schematically showing an enlarged Figure 3 plan view of an embodiment of a display element layer of the EA1 portion.

[0032] Figure 5 is according to Figure 4 a cross-sectional view taken along line I-I' of

[0033] Figure 6 is a plan view of another embodiment of a display element layer schematically showing an enlarged Figure 3 EA1 portion.

[0034] Figure 7 is a cross-sectional view taken along line II-II' according to Figure 6 .

[0035] Figure 8 is a plan view of still another embodiment of a display element layer schematically showing an enlarged Figure 3 EA1 portion.

[0036] Figure 9 is a cross-sectional view taken along line III-III' according to Figure 8 .

[0037] Figure 10 is a plan view of still another embodiment of a display element layer schematically showing an enlarged Figure 3 EA1 portion.

[0038] Figures 11 to 14 is a plan view of various embodiments of a display element layer schematically showing an enlarged Figure 3 EA2 portion.

[0039] Figure 15a and Figure 15b is a plan view of various embodiments of a display element layer schematically showing an enlarged Figure 3 EA3 portion.

[0040] Figure 16 is a cross-sectional view taken along line IV-IV' according to Figure 15b .

[0041] Figure 17 is a cross-sectional view of a display device according to an embodiment of the present invention.

[0042] Figures 18a to 18g is a plan view sequentially showing a manufacturing method of a display device according to an embodiment of the present invention.

[0043] Symbol Explanation

[0044] EL1: First electrode EL2: Second electrode

[0045] VP1: First protrusion VP2: Second protrusion

[0046] BNK1: First bank BNK2: Second bank

[0047] CNT1: First contact electrode CNT[2]: Second contact electrode

[0048] DEL1: First dummy electrode DEL2: Second dummy electrode

[0049] DVP1: First dummy protrusion DVP2: Second dummy protrusion

[0050] DBNK1: First dummy bank DBNK2: Second dummy bank

[0051] DCNT1: First dummy contact electrode DCNT2: Second dummy contact electrode

[0052] INS: Insulating film INSP: Insulating pattern

[0053] LD1: First light-emitting element LD2: Second light-emitting element

[0054] SUB: Substrate PCL: Pixel circuit layer

[0055] DPL: Display element layer Detailed implementation manners

[0056] The present invention can be variously modified and can have various forms. Specific embodiments are illustrated in the drawings and are described in detail in this specification. However, this is not to limit the present invention to the specific disclosed forms, and it should be understood to include all modifications, equivalents, and alternatives included in the spirit and technical scope of the present invention.

[0057] When explaining each drawing, similar reference numerals are used for similar components. In the drawings, for the clarity of the present invention, the sizes of the structures are enlarged compared to the actual ones. Terms such as first and second can be used to explain various components, but the components should not be limited by these terms. These terms are only used for the purpose of distinguishing one component from other components. For example, without exceeding the scope of the rights of the present invention, the first component can be named the second component, and similarly, the second component can also be named the first component. Unless there is a clearly different meaning in the text, singular expressions include plural expressions.

[0058] In this application, terms such as "comprising" or "having" are used to refer to the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and do not preclude in advance the presence or the possibility of addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof. Also, when it is mentioned that a part of a layer, film, region, plate, etc. is "on" another part, it includes not only the case where it is "directly on" the other part, but also the case where there are other parts between the two. And, in this specification, when it is mentioned that a part of a certain layer, film, region, plate, etc. is formed "on" another part, the forming direction is not limited to the upper direction only, but also includes the case of forming in the side or lower direction. On the contrary, when it is mentioned that a part of a layer, film, region, plate, etc. is "under" another part, it includes not only the case where it is "directly under" the other part, but also the case where there are other parts between the two.

[0059] Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

[0060] Figure 1a and Figure 1b is a perspective view showing a light-emitting element according to an embodiment of the present invention. In Figure 1a and Figure 1b a cylindrical light-emitting element LD is illustrated, however, the present invention is not limited thereto.

[0061] Referring to Figure 1a and Figure 1b , a light-emitting element LD according to an embodiment of the present invention may include a first semiconductor layer 11, a second semiconductor layer 13, and an active layer 12 interposed between the first semiconductor layer 11 and the second semiconductor layer 13.

[0062] As an example, the light-emitting element LD may be implemented as a stack in which the first semiconductor layer 11, the active layer 12, and the second semiconductor layer 13 are stacked in this order.

[0063] According to an embodiment of the present invention, the light-emitting element LD may be provided in a rod shape extending in one direction. If the extending direction of the light-emitting element LD is called the length direction, the light-emitting element LD may have one end and the other end along the length direction.

[0064] In an embodiment of the present invention, one of the first semiconductor layer 11 and the second semiconductor layer 13 may be arranged at one end (for example, the first part), and the remaining one of the first semiconductor layer 11 and the second semiconductor layer 13 may be arranged at the other end (for example, the second part).

[0065] The light-emitting element LD can be set in various shapes. As an example, the light-emitting element LD can have a rod-like shape or a bar-like shape that is long in the length direction (i.e., the aspect ratio is greater than 1). In an embodiment of the present invention, the length L of the light-emitting element LD in the length direction can be greater than its diameter D (or the width of the cross-section). As an example, such a light-emitting element LD can include a light-emitting diode manufactured to have a diameter D and / or a length L on the order of micrometers or nanometers, which is extremely small. In an embodiment of the present invention, for the light-emitting element LD, the size of the light-emitting element LD can be changed to meet the requirements (or design conditions) of the applied lighting device or self-luminous display device.

[0066] As an example, the first semiconductor layer 11 can include at least one n-type semiconductor layer. For example, the first semiconductor layer 11 can include any one of semiconductor materials such as InAlGaN, GaN, AlGaN, InGaN, AlN, and InN, and can include a semiconductor layer doped with a first-conductivity dopant such as Si, Ge, Sn, etc.

[0067] The material constituting the first semiconductor layer 11 is not limited thereto, and the first semiconductor layer 11 can be formed of various other materials.

[0068] The active layer 12 can be formed on the first semiconductor layer 11 and is formed into a single quantum well structure or a multi-quantum well structure. In various embodiments of the present invention, a cladding layer (not shown) doped with a conductivity dopant can also be formed on the upper and / or lower portions of the active layer 12. As an example, the cladding layer can be realized by an AlGaN layer or an InAlGaN layer. In addition, it is obvious that materials such as AlGaN and AlInGaN can also be used as the active layer 12.

[0069] If an electric field above a predetermined voltage is applied across both ends of the light-emitting element LD, electron-hole pairs will recombine in the active layer 12, and then the light-emitting element LD will emit light.

[0070] The second semiconductor layer 13 can be provided on the active layer 12 and includes a semiconductor layer of a type different from that of the first semiconductor layer 11. As an example, the second semiconductor layer 13 can include at least one p-type semiconductor layer. For example, the second semiconductor layer 13 can include at least one of semiconductor materials such as InAlGaN, GaN, AlGaN, InGaN, AlN, and InN, and can include a semiconductor layer doped with a second-conductivity dopant such as Mg.

[0071] The material constituting the second semiconductor layer 13 is not limited thereto, and the second semiconductor layer 13 can be formed of various other materials.

[0072] According to an embodiment of the present invention, in addition to the above-mentioned first semiconductor layer 11, active layer 12, and second semiconductor layer 13, the light-emitting element LD may further include other phosphor layers, active layers, semiconductor layers, and / or electrodes on the upper and / or lower portions of each layer.

[0073] As an embodiment, the light-emitting element LD may further include at least one electrode disposed on one end side (as an example, the upper surface) of the second semiconductor layer 13 or one end side (as an example, the lower surface) of the first semiconductor layer 11.

[0074] For example, as Figure 1b shown, the light-emitting element LD may further include an electrode 15 disposed on one end side of the second semiconductor layer 13. The electrode 15 may be an Ohmic contact electrode, but is not limited thereto. According to an embodiment, the electrode 15 may be a Schottky contact electrode. Also, the electrode 15 may include a metal or a metal oxide. As an example, chromium (Cr), titanium (Ti), aluminum (Al), gold (Au), nickel (Ni), ITO, and their oxides or alloys may be used alone or in combination, but are not limited thereto. Also, according to an embodiment, the electrode 15 may be substantially transparent or semi-transparent. Accordingly, the light generated by the light-emitting element LD can pass through the electrode 15 and be emitted to the outside of the light-emitting element LD.

[0075] Also, the light-emitting element LD may further include an insulating film 14. However, according to an embodiment of the present invention, the insulating film 14 may also be omitted, and may also be provided to cover only a part of the first semiconductor layer 11, active layer 12, and second semiconductor layer 13.

[0076] For example, the insulating film 14 may also be provided on a portion of the light-emitting element LD other than both end portions, so that both end portions of the light-emitting element LD are exposed.

[0077] For the sake of convenience of explanation, the shape in which a part of the insulating film 14 is removed is illustrated in Figure 1a and Figure 1b , but in fact, the side surface of the light-emitting element LD may be entirely surrounded by the insulating film 14.

[0078] The insulating film 14 may be provided to surround at least a part of the outer peripheral surface of the first semiconductor layer 11, active layer ı2, and / or second semiconductor layer 13. As an example, the insulating film 14 may also be provided to surround at least the outer peripheral surface of the active layer 12. Also, in the case where the light-emitting element LD includes the electrode 15, the insulating film 14 may also be provided to surround at least a part of the outer peripheral surface of the electrode 15.

[0079] According to an embodiment of the present invention, the insulating film 14 may include a transparent insulating material. For example, the insulating film 14 may include one or more insulating materials selected from the group consisting of SiO2, Si3N4, Al2O3, and TiO2. However, it is not limited thereto, and various materials having insulating properties may be used.

[0080] If the insulating film 14 is disposed on the light-emitting element LD, it is possible to prevent the active layer 12 from being short-circuited with a first electrode and / or a second electrode (not shown).

[0081] Moreover, by forming the insulating film 14, surface defects of the light-emitting element LD can be minimized, thereby improving the lifespan and efficiency. Also, in the case where a plurality of light-emitting elements LD are closely arranged, the insulating film 14 can prevent an undesired short circuit that may occur between the light-emitting elements LD.

[0082] The above-described light-emitting element LD can be used as a light source for various display devices. As an example, the light-emitting element LD can be used as a light source element for an illumination device or a self-emitting display device.

[0083] Figure 2a and Figure 2b is a circuit diagram showing a unit light-emitting area of a display device according to an embodiment of the present invention.

[0084] Figure 2a and Figure 2b illustrates an example of a pixel constituting an active light-emitting display panel. In an embodiment of the present invention, the unit light-emitting area may be a pixel area in which one sub-pixel is provided.

[0085] Referring to Figure 2a a sub-pixel SP may include one or more light-emitting elements LD and a pixel driving circuit 144 connected thereto to drive the light-emitting elements LD.

[0086] A first electrode (e.g., an anode electrode) of the light-emitting element LD may be connected to a first driving power source VDD via the pixel driving circuit 144, and a second electrode (e.g., a cathode electrode) of the light-emitting element LD may be connected to a second driving power source VSS.

[0087] The first driving power source VDD and the second driving power source VSS may have different potentials from each other. As an example, the second driving power source VSS may have a potential lower than the potential of the first driving power source VDD by more than the threshold voltage of the light-emitting element LD.

[0088] Each light-emitting element LD may emit light with a brightness corresponding to a driving current controlled by the pixel driving circuit 144.

[0089] In addition, Figure 2aEmbodiments in which the sub-pixel SP includes only one light-emitting element LD are disclosed, but the present invention is not limited thereto. For example, the sub-pixel SP may include a plurality of light-emitting elements LD connected in parallel with each other.

[0090] According to an embodiment of the present invention, the pixel driving circuit 144 may include a first transistor T1, a second transistor T2, and a storage capacitor Cst. However, the structure of the pixel driving circuit 144 is not limited to Figure 2a the illustrated embodiment.

[0091] The first electrode of the first transistor (driving transistor) T1 may be connected to the first driving power supply VDD, and the second electrode may be electrically connected to the first electrode of each light-emitting element LD. The gate electrode of the first transistor T1 may be connected to the first node N1. The first transistor T1 as described above may control the amount of driving current supplied to the light-emitting element LD corresponding to the voltage of the first node N1.

[0092] The first electrode of the second transistor (switching transistor) T2 may be connected to the data line DL, and the second electrode may be connected to the first node N1. Here, the first electrode and the second electrode of the second transistor T2 are different electrodes from each other. For example, if the first electrode is the source electrode, the second electrode may be the drain electrode. And, the gate electrode of the second transistor T2 may be connected to the scan line SL.

[0093] When a scan signal capable of turning on the second transistor T2 (for example, a low voltage) is supplied from the scan line SL, the second transistor T2 as described above is turned on, and thus the data line DL and the first node N1 are electrically connected. At this time, a data signal corresponding to the corresponding frame is supplied through the data line DL, and thus the data signal is transmitted to the first node N1. The data signal transmitted to the first node N1 charges the storage capacitor Cst.

[0094] One electrode of the storage capacitor Cst is connected to the first driving power supply VDD, and the other electrode is connected to the first node N1. The storage capacitor Cst as described above is charged with a voltage corresponding to the data signal supplied to the first node N1, and maintains the charged voltage until a data signal of the next frame is supplied.

[0095] For ease of explanation, Figure 2a a pixel driving circuit 144 with a relatively simple structure is illustrated in, the pixel driving circuit 144 includes: a second transistor T2 for transmitting a data signal inside the sub-pixel SP; a storage capacitor Cst for storing the data signal; a first transistor T1 for supplying a driving current corresponding to the data signal to the light-emitting element LD.

[0096] However, the present invention is not limited thereto, and the structure of the pixel driving circuit 144 can be variously modified and implemented. As an example, the pixel driving circuit 144 may additionally include at least one transistor element such as a transistor element for compensating the threshold voltage of the first transistor T1, a transistor element for initializing the first node N1, and / or a transistor element for controlling the light emission time of the light emitting element LD, or other circuit elements such as a boosting capacitor for boosting the voltage of the first node N1, which is obvious.

[0097] And, although Figure 2a illustrates a case where all the transistors (e.g., the first transistor T1 and the second transistor T2) included in the pixel driving circuit 144 are P-type transistors, the present invention is not limited thereto. That is, at least one of the first transistor T1 and the second transistor T2 included in the pixel driving circuit 144 may be changed to an N-type transistor.

[0098] Referring to Figure 2b , the first transistor T1 and the second transistor T2 according to an embodiment of the present invention may be implemented as N-type transistors. Except for the change in the connection positions of some components due to the change in the transistor type, Figure 2b the configuration or operation of the pixel driving circuit 144 shown in Figure 2a is similar to that of the pixel driving circuit 144 in

[0099] Figure 3 is a plan view showing a display device according to an embodiment of the present invention. In particular, it is a schematic plan view of a display device using the light emitting element LD shown in Figure 1a or Figure 1b as a light source.

[0100] Referring to Figure 1a , Figure 1b and Figure 3 , a display device according to an embodiment of the present invention may include a substrate SUB, pixels PXL provided on one surface of the substrate SUB, a driving unit provided on the substrate SUB and driving the pixels PXL, and a wiring unit (not shown) connecting the pixels PXL and the driving unit.

[0101] The display device may be classified into a passive matrix type display device and an active matrix type display device according to the manner of driving the light emitting element LD. As an example, when the display device is implemented as an active matrix type, each pixel PXL may include a driving transistor for controlling the amount of current supplied to the light emitting element LD and a switching transistor for transmitting a data signal to the driving transistor, etc.

[0102] Recently, considering resolution, contrast, and operation speed, active matrix display devices that select and light up each pixel PXL have become mainstream. However, the present invention is not limited thereto, and passive matrix display devices that perform lighting by pixel PXL groups can also use components (as an example, a first electrode, a second electrode, etc.) for driving a light-emitting element LD.

[0103] The substrate SUB may include a display area AA and a non-display area NAA. The display area AA, as an area for providing pixels PXL for displaying an image, may be named an active area. In various embodiments, each pixel PXL may include at least one light-emitting element LD. The light-emitting element LD may be an organic light-emitting diode or an ultra-small inorganic light-emitting diode having a size in the range of micrometers to nanometers. However, the present invention is not limited thereto. The display device displays an image in the display area AA by driving the pixels PXL corresponding to image data input from the outside.

[0104] The non-display area NAA, as an area arranged around the display area AA, may be named a non-active area. In various embodiments, the non-display area NAA may generally represent the remaining area on the substrate SUB other than the display area AA. As Figure 3 shown, the non-display area NAA may be set in a form surrounding the display area AA.

[0105] The non-display area NAA may be an area where a driving unit for driving the pixels PXL and a part of a wiring unit connecting the pixels PXL and the driving unit are provided.

[0106] In various embodiments of the present invention, the non-display area NAA may include a dummy area DA. The dummy area DA may be located on at least one side of the display area AA. Referring to Figure 3 , the dummy areas DA may be located on the left and right sides of the display area AA, respectively. However, the positions where the dummy areas DA are provided are not limited thereto. For example, the dummy area DA may be located only on the left side of the display area AA, or may be located only on the right side of the display area AA.

[0107] The pixels PXL may be provided in the display area AA on the substrate SUB. Each pixel PXL, as a unit for displaying an image, may be provided in multiple numbers. The pixel PXL may include a light-emitting element LD that emits white light and / or colored light. Each pixel PXL may emit light of any one of red, green, and blue. However, it is not limited thereto. For example, each pixel PXL may also emit light of one of cyan, magenta, yellow, and white.

[0108] The pixels PXL can be set to multiple, and then arranged in a matrix form along columns extending in a first direction DR1 and rows extending in a second direction DR2 intersecting the first direction DR1. However, the arrangement form of the pixels PXL is not particularly limited and can be arranged in various forms.

[0109] The driving unit can supply signals to each pixel PXL through a wiring unit to control the driving of the pixel PXL. For ease of explanation, Figure 3 the wiring unit is omitted.

[0110] The driving unit may include: a scan driving unit SDV that supplies a scan signal to the pixel PXL through a scan line; a light emission driving unit (not shown) that supplies a light emission control signal to the pixel PXL through a light emission control line; a data driving unit DDV that supplies a data signal to the pixel PXL through a data line; and a timing control unit (not shown). The timing control unit can control the scan driving unit SDV, the light emission driving unit, and the data driving unit DDV.

[0111] The display device according to an embodiment of the present invention can be adopted in various electronic devices. For example, the display device can be applied to televisions, laptop computers, mobile phones, smart phones, smart tablets (PD), personal multimedia players (PMP), personal digital assistants (PDA), navigators, various wearable devices such as smart watches, etc.

[0112] Figure 4 is a schematic plan view showing an embodiment of a display element layer of an enlarged Figure 3 EA1 part, Figure 5 is a cross-sectional view taken along the I-I' line according to Figure 4 this.

[0113] In Figure 4 it, a case where the first light emitting element LD1 and the second light emitting element LD2 are arranged neatly in parallel along the second direction DR2 is illustrated. However, the arrangement of the first light emitting element LD1 and the second light emitting element LD2 is not limited thereto. For example, the first light emitting element LD1 can also be arranged neatly at a predetermined angle with respect to the second direction DR2 between the first electrode EL1 and the second electrode EL2. Also, the second light emitting element LD2 can also be arranged neatly at a predetermined angle with respect to the second direction DR2 between the first dummy electrode DEL1 and the second dummy electrode DEL2.

[0114] Hereinafter, the first light emitting element LD1 and the second light emitting element LD2 are collectively referred to as the light emitting element LD.

[0115] As Figures 4 to 5As shown, a display element layer DPL according to an embodiment of the present invention may include a first bank BNK1 and a second bank BNK2 disposed on a substrate SUB, a first electrode EL1 and a second electrode EL2, a first light-emitting element LD1, a first contact electrode CNT1 and a second contact electrode CNT2, a bank pattern BNKP, a first dummy electrode DEL1, a second dummy electrode DEL2, a second light-emitting element LD2, a first dummy contact electrode DCNT1 and a second dummy contact electrode DCNT2.

[0116] The substrate SUB may be a rigid substrate or a flexible substrate.

[0117] The rigid substrate may include a glass substrate, a quartz substrate, a glass-ceramic substrate, and a crystallized glass substrate.

[0118] The flexible substrate may include a thin-film substrate and a plastic substrate containing a polymer organic substance. For example, the flexible substrate may include one of polyethersulfone (PES), polyacrylate, polyetherimide (PEI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyarylate (PAR), polyimide (PI), polycarbonate (PC), triacetate cellulose (TAC), and cellulose acetate propionate (CAP). Also, the flexible substrate may include fiber glass reinforced plastic (FRP).

[0119] The material applied to the substrate SUB may preferably have resistance (or heat resistance) to a relatively high processing temperature during the manufacturing process of the display device. In various embodiments of the present invention, the substrate SUB may be flexible as a whole or at least in part.

[0120] The display element layer DPL may include a buffer layer disposed on the substrate SUB. For example, the above-described first bank BNK1 and second bank BNK2, first electrode EL1 and second electrode EL2, first light-emitting element LD1, first contact electrode CNT1 and second contact electrode CNT2, bank pattern BNKP, first dummy electrode DEL1, second dummy electrode DEL2, second light-emitting element LD2, first dummy contact electrode DCNT1 and second dummy contact electrode DCNT2 may be disposed on the buffer layer.

[0121] The buffer layer can prevent impurities from diffusing into the first light-emitting element LD1 and the second light-emitting element LD2. The buffer layer may be provided as a single layer, but may also be provided as a multi-layer of at least two layers. In the case where the buffer layer is provided as a multi-layer, each layer may be formed of the same material or different materials. Additionally, the buffer layer may also be omitted depending on the material and process conditions of the substrate SUB.

[0122] In various embodiments of the present invention, the display element layer DPL may include a first bank BNK1 and a second bank BNK2 disposed on the substrate SUB.

[0123] As Figure 4 shown, the first bank BNK1 and the second bank BNK2 may be disposed on the display area AA of the substrate SUB in a form extending along the first direction DR1 and spaced apart from each other along the second direction DR2, and may divide the unit light-emitting area.

[0124] Two banks BNK1, BNK2 adjacent to each other on the substrate SUB may be spaced apart by a predetermined interval along the second direction DR2. For example, two adjacent first banks BNK1 and second banks BNK2 may be spaced apart by more than the length of the first light-emitting element LD1 on the substrate SUB.

[0125] The first bank BNK1 and the second bank BNK2 may include an inorganic insulating film made of an inorganic material or an organic insulating film made of an organic material. According to an embodiment, the first bank BNK1 and the second bank BNK2 may include a single-layer organic insulating film and / or a single-layer inorganic insulating film, however, the present invention is not limited thereto. According to an embodiment, the first bank BNK1 and the second bank BNK2 may also be provided in the form of a multi-layer film in which at least one organic insulating film and at least one inorganic insulating film are stacked. However, the materials of the first bank BNK1 and the second bank BNK2 are not limited to the above embodiments, and according to an embodiment, the first bank BNK1 and the second bank BNK2 may also include a conductive substance.

[0126] As Figure 5As shown, the first bank BNK1 and the second bank BNK2 may have a trapezoidal cross-section that becomes narrower towards the upper part along the third direction DR3, but is not limited thereto. As another example, the first bank BNK1 and the second bank BNK2 may have a curved surface with a cross-section such as a semi-circle or semi-ellipse that becomes narrower towards the upper part. In the present invention, the shape and / or inclination of the first bank BNK1 and the second bank BNK2 are not particularly limited, and various modifications can be made thereto.

[0127] On the substrate SUB, the first electrode EL1 and the second electrode EL2 may extend along the first direction DR1 and be spaced apart from each other along the second direction DR2. The first light-emitting element LD1 may be electrically connected to the first electrode EL1 and the second electrode EL2.

[0128] Referring Figure 4 and Figure 5 , the first electrode EL1 may be disposed on the first bank BNK1, and the second electrode EL2 may be disposed on the second bank BNK2. At this time, the first electrode EL1 may have a shape corresponding to the inclination of the first bank BNK1, and the second electrode EL2 may have a shape corresponding to the inclination angle of the second bank BNK2. For example, each of the first electrode EL1 and the second electrode EL2 may include a protruding portion corresponding to the first bank BNK1 and the second bank BNK2 and a flat portion corresponding to the substrate SUB.

[0129] In various embodiments of the present invention, the first electrode EL1 and the second electrode EL2 may be reflective electrodes. The first electrode EL1 and the second electrode EL2 as reflective electrodes may guide the light emitted from the first light-emitting element LD1 in the direction from the substrate SUB towards the display element layer DPL (e.g., the front direction).

[0130] The first bank BNK1 and the second bank BNK2, and the first electrode EL1 and the second electrode EL2 may each guide the light emitted from the first light-emitting element LD1 in a desired direction, thereby functioning as a reflective component that improves the light efficiency of the display device. That is, the first bank BNK1 and the second bank BNK2, and the first electrode EL1 and the second electrode EL2 may each cause the light emitted from the first light-emitting element LD1 to travel in the front direction of the display device (e.g., the image display direction), thereby functioning as a reflective component that improves the light extraction efficiency of the first light-emitting element LD1.

[0131] The first electrode EL1 and the second electrode EL2 as reflective electrodes may include a conductive material with a high light reflectivity. As an example, the conductive material with a high light reflectivity may include metals such as Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Ti, and their alloys.

[0132] According to an embodiment, the first electrode EL1 and the second electrode EL2 may each include a transparent conductive material. The transparent conductive material may include conductive oxides such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium tin zinc oxide (ITZO), etc., and conductive polymers such as poly(ethylenedioxythiophene) (PEDOT), etc. In the case where the first electrode EL1 and the second electrode EL2 each include a transparent conductive material, an additional conductive layer made of an opaque metal used to reflect the light emitted from the first light-emitting element LD1 toward the front direction (image display direction) of the display device may be additionally included. However, the materials of the first electrode EL1 and the second electrode EL2 are not limited to the above materials.

[0133] In various embodiments of the present invention, a bank pattern BNKP may be provided in the peripheral region around the pixel region of each pixel PXL.

[0134] The bank pattern BNKP may surround at least one side of the peripheral region included in the pixel region of each pixel PXL. The bank pattern BNKP is a structure that defines (or divides) the light-emitting regions of each pixel PXL and each of the adjacent pixels PXL, and may be a pixel defining film as an example. Such a bank pattern BNKP is configured to include at least one light-blocking substance and / or reflective substance, thereby preventing the occurrence of light leakage, a phenomenon in which light (or light rays) leaks between each pixel PXL and the adjacent pixels PXL. According to an embodiment, in order to further improve the efficiency of the light emitted from each pixel PXL, a reflective substance layer may be formed on the bank pattern BNKP. According to an embodiment, the bank pattern BNKP may be formed in a different layer or the same layer as the first bank BNK1 and the second bank BNK2.

[0135] In various embodiments of the present invention, the display element layer DPL may include an insulating film INS that covers the first electrode EL1 and the second electrode EL2, the first dummy electrode DEL1 and the second dummy electrode DEL2. Specifically, the insulating film INS may be provided on one surface of a substrate SUB including the first bank BNK1 and the second bank BNK2, the bank pattern BNKP, the first electrode EL1 and the second electrode EL2, the first dummy electrode DEL1 and the second dummy electrode DEL2. The first electrode EL1 and the second electrode EL2, the first dummy electrode DEL1 and the second dummy electrode DEL2 are covered by the insulating film INS, so that the first electrode EL1 and the second electrode EL2, the first dummy electrode DEL1 and the second dummy electrode DEL2 may not be affected by static electricity flowing in from the outside.

[0136] The insulating film INS may be configured to include an organic insulating film, an inorganic insulating film, or a form of the organic insulating film disposed on the inorganic insulating film. Here, the inorganic insulating film may include at least one of silicon oxide (SiO x ), silicon nitride (SiN x ), silicon oxynitride (SiON), and metal oxides such as AlO x . The organic insulating film may include an organic insulating material capable of transmitting light.

[0137] The organic insulating film may include, for example, at least one of polyacrylates resin, epoxy resin, phenolic resin, polyamides resin, polyimides resin, unsaturated polyesters resin, poly-phenylene ethers resin, poly-phenylenesulfides resin, and benzocyclobutene resin.

[0138] In various embodiments of the present invention, the insulating film INS may be formed of an inorganic insulating film that is advantageous for protecting the first light-emitting element LD1 and the second light-emitting element LD2 from the pixel circuit layer (not shown) of each pixel PXL, but the present invention is not limited thereto. According to an embodiment, the insulating film INS may also be formed of an organic insulating film that is advantageous for planarizing the support surfaces of the first light-emitting element LD1 and the second light-emitting element LD2.

[0139] The first light-emitting element LD1 may be disposed between the first electrode EL1 and the second electrode EL2 on the insulating film INS. That is, the first light-emitting element LD1 may be disposed on a layer different from the first electrode EL1 and the second electrode EL2.

[0140] In an embodiment of the present invention, the expression "formed and / or disposed on the same layer" may mean formed in the same process, and the expression "formed and / or disposed on different layers" may mean formed in different processes.

[0141] In various embodiments of the present invention, the display element layer DPL may include a first contact electrode CNT1 that electrically connects the first electrode EL1 and the first light-emitting element LD1, and a second contact electrode CNT2 that electrically connects the second electrode EL2 and the first light-emitting element LD1.

[0142] As Figure 4 and Figure 5 shown, the first contact electrode CNT1 and the second contact electrode CNT2 and the first light-emitting element LD1 can be disposed on the insulating film INS. Through the contact holes penetrating the insulating film INS, the first contact electrode CNT1 can be connected to the first electrode EL1, and the second contact electrode CNT2 is connected to the second electrode EL2.

[0143] Different from Figure 5 that shown, the insulating film INS may include a first opening (not shown) exposing a part of the first electrode EL1 and a second opening (not shown) exposing a part of the second electrode EL2. At this time, the first contact electrode CNT1 can be disposed in the first opening and contact the first electrode EL1 exposed through the first opening. And, the second contact electrode CNT2 can be disposed in the second opening and contact the second electrode EL2 exposed through the second opening.

[0144] Figure 5 The case where the first contact electrode CNT1 and the second contact electrode CNT2 are disposed on the same layer of the insulating film INS is illustrated in

[0145] However, the first contact electrode CNT1 and the second contact electrode CNT2 may also be disposed on different layers. When the first contact electrode CNT1 and the second contact electrode CNT2 are disposed on different layers, an additional insulating film may be provided between the first contact electrode CNT1 and the second contact electrode CNT2.

[0146] The first contact electrode CNT1 and the second contact electrode CNT2 include at least one of various transparent conductive materials represented by ITO, IZO, and ITZO, and may be implemented to be substantially transparent or translucent to satisfy a predetermined light transmittance. That is, the first contact electrode CNT1 and the second contact electrode CNT2 can be formed of a transparent conductive material so that the light emitted from each first light-emitting element LD1 can be transmitted without loss.

[0147] However, the materials of the first contact electrode CNT1 and the second contact electrode CNT2 are not limited to the above embodiments. According to the embodiments, the first contact electrode CNT1 and the second contact electrode CNT2 may also be formed of various opaque conductive materials.

[0148] In various embodiments of the present invention, the above-described first bank BNK1 and second bank BNK2, first electrode EL1 and second electrode EL2, first light-emitting element LD1, first contact electrode CNT1, and second contact electrode CNT2 may be provided in each pixel PXL.

[0149] As Figure 4 and Figure 5 shown, a first dummy electrode DEL1 and a second dummy electrode DEL2 may be provided on a dummy region DA. The first dummy electrode DEL1 may extend along a first direction DR1 and may be spaced apart from the first electrode EL1 and the second electrode EL2 along a second direction DR2. Each of the second dummy electrodes DEL2 may be spaced apart from each other along the first direction DR1 and may be spaced apart from the first electrode EL1, the second electrode EL2, and the first dummy electrode DEL1 along the second direction DR2.

[0150] In various embodiments of the present invention, a second light-emitting element LD2 may be provided between each of the second dummy electrodes DEL2 and the first dummy electrode DEL1. Specifically, one second light-emitting element LD2 may be respectively provided between each of the second dummy electrodes DEL2 and the first dummy electrode DEL1. Referring to Figure 4 , one of the plurality of second light-emitting elements LD2 may be provided between the first dummy electrode DEL1 and the 2-1st dummy electrode DEL2-1, and one of the plurality of second light-emitting elements LD2 may be provided between the first dummy electrode DEL1 and the 2-2nd dummy electrode DEL2-2.

[0151] By respectively providing one second light-emitting element LD2 between each of the second dummy electrodes DEL2 and the first dummy electrode DEL1, as described later, it is possible to easily measure the contact resistance of each second light-emitting element LD2.

[0152] In various embodiments of the present invention, the first dummy electrode DEL1 may have a planar shape corresponding to the planar shape of the first electrode EL1, and each of the second dummy electrodes DEL2 has a planar shape corresponding to the planar shape of the second electrode EL2.

[0153] In the present invention, the corresponding shape may include a case where the shapes are substantially the same or similar.

[0154] As described later, the first dummy electrode DEL1 and the second dummy electrode DEL2 may be provided to measure the contact resistance of each second light-emitting element LD2. That is, the second light-emitting element LD2 electrically connected to the first dummy electrode DEL1 and the second dummy electrode DEL2 may be a light-emitting element that does not display an image in the display device.

[0155] By setting the shape of the first dummy electrode DEL1 to correspond to the shape of the first electrode EL1 and setting the shape of the second dummy electrode DEL2 to correspond to the shape of the second electrode EL2, the first light-emitting element LD1 disposed on the display area AA and the second light-emitting element LD2 disposed on the dummy area DA can be placed in a similar environment. Accordingly, by measuring the contact resistance of the second light-emitting element LD2 disposed on the dummy area DA, it is possible to monitor the electrical environment such as the contact resistance of the first light-emitting element LD1 disposed on the display area AA without separately measuring the contact resistance of the first light-emitting element LD1.

[0156] Each of the first dummy electrode DEL1 and the second dummy electrode DEL2 can be formed of the same material as the material forming the above-described first electrode EL1 and second electrode EL2. Accordingly, the first light-emitting element LD1 disposed on the display area AA and the second light-emitting element LD2 disposed on the dummy area DA can be placed in a similar environment, and the contact resistance of the first light-emitting element LD1 can be monitored more accurately by measuring the contact resistance of the second light-emitting element LD2.

[0157] An insulating film INS can be provided on one surface of the substrate SUB provided with the first dummy electrode DEL1 and the second dummy electrode DEL2, and the second light-emitting element LD2, the first dummy contact electrode DCNT1, and the second dummy contact electrode DCNT2 can be provided on the insulating film INS.

[0158] As Figure 5 shown, the first dummy contact electrode DCNT1 can be connected to the first dummy electrode DEL1 and the second dummy contact electrode DCNT2 can be connected to each second dummy electrode DEL2 through contact holes penetrating the insulating film INS.

[0159] As Figure 4 and Figure 5 shown, the first dummy contact electrode DCNT1 can cover at least a part of the first dummy electrode DEL1 and electrically connect the first dummy electrode DEL1 to the second light-emitting element LD2. Also, the second dummy contact electrode DCNT2 can cover at least a part of the second dummy electrode DEL2 and electrically connect the second dummy electrode DEL2 to the second light-emitting element LD2.

[0160] In addition, as Figure 5Unlike the above, the insulating film INS may include a third opening (not shown) that exposes a part of the first dummy electrode DEL1 and a fourth opening (not shown) that exposes a part of each second dummy electrode DEL2. At this time, the first dummy contact electrode DCNT1 may be disposed in the third opening and contact the first dummy electrode DEL1 exposed through the third opening. Also, the second dummy contact electrode DCNT2 may be disposed in the fourth opening and contact each second dummy electrode DEL2 exposed through the fourth opening.

[0161] A first dummy contact electrode DCNT1 may be provided at one end of the second light-emitting element LD2, and a second dummy contact electrode DCNT2 may be provided at the other end. Accordingly, the second light-emitting element LD2 may be electrically connected to the first dummy electrode DEL1 and the second dummy electrode DEL2.

[0162] Each of the first dummy contact electrode DCNT1 and the second dummy contact electrode DCNT2 may be formed of the same material as that of the first contact electrode CNT1 and the second contact electrode CNT2 formed above. Accordingly, the first light-emitting element LD1 provided on the display area AA and the second light-emitting element LD2 provided on the dummy area DA may be placed in a similar environment, and the contact resistance of the first light-emitting element LD1 can be monitored more accurately by measuring the contact resistance of the second light-emitting element LD2.

[0163] In various embodiments of the present invention, the display element layer DPL may include a packaging layer INC provided on one surface of a substrate SUB on which a first bank BNK1, a second bank BNK2, a first electrode EL1, a second electrode EL2, a first light-emitting element LD1, a first contact electrode CNT1, a second contact electrode CNT2, a bank pattern BNKP, a first dummy electrode DEL1, a second dummy electrode DEL2, a second light-emitting element LD2, a first dummy contact electrode DCNT1, and a second dummy contact electrode DCNT2 are provided.

[0164] The packaging layer INC may cover the first electrode EL1, the second electrode EL2, the first contact electrode CNT1, the second contact electrode CNT2, the first light-emitting element LD1, the first dummy electrode DEL1, the second dummy electrode DEL2, the first dummy contact electrode DCNT1, the second dummy contact electrode DCNT2, and the second light-emitting element LD2 so as not to be exposed to the outside, thereby preventing corrosion.

[0165] The packaging layer INC may be configured as a single layer or multiple layers and may include a transparent insulating material to transmit light. The transparent insulating material may include an organic material or an inorganic material. For example, the packaging layer INC may include, such as silicon nitride (SiN x ), silicon oxide (SiO x) or silicon oxynitride (SiO x N y ) and other transparent insulating materials.

[0166] In one embodiment, in order to minimize the damage to the light emitted from the first light-emitting element LD1 and reflected by the first electrode EL1 and the second electrode EL2 in the image display direction of the display device, the encapsulation layer INC can be formed of a low-refractive-index transparent insulating material such as silicon oxide (SiO x ).

[0167] In one embodiment, the encapsulation layer INC may include a thin-film encapsulation layer having a multilayer structure. For example, the encapsulation layer INC may be configured as a thin-film encapsulation layer having a multilayer structure including at least two inorganic insulating layers and at least one organic insulating layer interposed between the at least two inorganic insulating layers. However, the constituent materials and / or structures of the encapsulation layer INC can be variously changed.

[0168] In various embodiments of the present invention, an overcoat layer (not shown) may be provided on the encapsulation layer INC. The overcoat layer may be an encapsulation layer that prevents the penetration of oxygen, moisture, etc. into the first light-emitting element LD1 and the second light-emitting element LD2.

[0169] Figure 6 is a schematic plan view showing another embodiment of the display element layer of the enlarged Figure 3 EA1 portion, Figure 7 is a cross-sectional view taken along line II-II' according to Figure 6 .

[0170] In the display device according to the present embodiment, in order to avoid repeated description, the description will be mainly made of the configurations not mentioned in the display device according to the above-described one embodiment. Parts not specifically described in the present embodiment follow the above-described one embodiment, and the same reference numerals denote the same constituent elements, and similar reference numerals denote similar constituent elements. This also applies to the embodiments described later.

[0171] Referring to Figure 6 and Figure 7 , the display element layer DPL according to an embodiment of the present invention may include a first bank BNK1 and a second bank BNK2 provided on a substrate SUB, a first electrode EL1 and a second electrode EL2, a first light-emitting element LD1, a first contact electrode CNT1 and a second contact electrode CNT2, a bank pattern BNKP, a first dummy electrode DEL1, a second dummy electrode DEL2, a second light-emitting element LD2, a first dummy contact electrode DCNT1 and a second dummy contact electrode DCNT2, and an insulating pattern INSP.

[0172] In various embodiments of the present invention, the first electrode EL1 may include a first protruding portion VP1 protruding toward the second electrode EL2, and the second electrode EL2 includes a second protruding portion VP2 protruding toward the first electrode EL1. At this time, the first protruding portion VP1 and the second protruding portion VP2 may face each other.

[0173] As Figure 6 shown, since the first protruding portion VP1 and the second protruding portion VP2 face each other, when the alignment signal described later is applied to the first electrode EL1 and the second electrode EL2, the electric field is concentrated between the first protruding portion VP1 and the second protruding portion VP2, so that the first light-emitting element LD1 can be effectively aligned between the first protruding portion VP1 and the second protruding portion VP2. Accordingly, the first light-emitting element LD1 may be disposed between the first protruding portion VP1 and the second protruding portion VP2.

[0174] In addition, although Figure 6 not shown, the first bank BNK1 may include a first bank protruding portion (not shown) protruding toward the second bank BNK2, and the second bank BNK2 includes a second bank protruding portion (not shown) protruding toward the first bank BNK1.

[0175] At this time, in a plane, the shape of the first electrode EL1 may correspond to the shape of the first bank BNK1, and the shape of the second electrode EL2 corresponds to the shape of the second bank BNK2. That is, the first electrode EL1 may be disposed on the first bank BNK1 such that the first protruding portion VP1 overlaps with a shape corresponding to the planar shape of the first bank protruding portion. And, the second electrode EL2 may be disposed on the second bank BNK2 such that the second protruding portion VP2 overlaps with a shape corresponding to the planar shape of the second bank protruding portion.

[0176] As Figure 6 and Figure 7 shown, the display element layer DPL may include an insulating pattern INSP disposed on the first light-emitting element LD1 and the second light-emitting element LD2. The insulating pattern INSP may prevent the first light-emitting element LD1 disposed between the first electrode EL1 and the second electrode EL2 and the second light-emitting element LD2 disposed between the first dummy electrode DEL1 and the second dummy electrode DEL2 from detaching from the aligned position.

[0177] The insulating pattern INSP may be provided in a form extending along the first direction DR1. The insulating pattern INSP may overlap a part of the light-emitting element LD, and thus one end portion and the other end portion of the light-emitting element LD are exposed. The insulating pattern INSP may be made of a transparent insulating material so that the light emitted from the light-emitting element LD is transmitted without loss.

[0178] The insulating pattern INSP may be formed of a single-layer film or a multi-layer film, and may include an inorganic insulating film containing at least one inorganic material or an organic insulating film containing at least one organic material. The insulating pattern INSP can further fix each first light-emitting element LD1 neatly arranged in the light-emitting regions of the respective pixels PXL.

[0179] In an embodiment of the present invention, the insulating pattern INSP may include an inorganic insulating film that is conducive to protecting the active layer 12 of each light-emitting element LD from the influence of external oxygen, moisture, etc. However, the present invention is not limited thereto. According to the design conditions of the display device using the light-emitting element LD, etc., the insulating pattern INSP may include an organic insulating film containing an organic material.

[0180] In addition, although not shown in the drawings, if there is a vacant gap (or space) between the insulating film INS and the light-emitting element LD along the third direction DR3 before the insulating pattern INSP is formed, then the vacant gap may be filled with the insulating pattern INSP during the formation of the insulating pattern INSP. Accordingly, the insulating pattern INSP may form an organic insulating film that is conducive to filling the vacant gap between the insulating film INS and the light-emitting element LD.

[0181] A first contact electrode CNT1 may be provided at one end of the first light-emitting element LD1 exposed through the insulating pattern INSP, and a second contact electrode CNT2 may be provided at the other end. Accordingly, the first light-emitting element LD1 can be electrically connected to the first electrode EL1 and the second electrode EL2.

[0182] Moreover, the first contact electrode CNT1 and the second contact electrode CNT2 may also be provided on the insulating pattern INSP. At this time, on the insulating pattern INSP, the first contact electrode CNT1 and the second contact electrode CNT2 may be spaced apart from each other. Since the first contact electrode CNT1 and the second contact electrode CNT2 are provided on the insulating pattern INSP, the positions of the first light-emitting elements LD1 neatly arranged between the first electrode EL1 and the second electrode EL2 can be fixed more stably.

[0183] In various embodiments of the present invention, the first dummy electrode DEL1 may include a first dummy protrusion DVP1 protruding toward each second dummy electrode DEL2, and each second dummy electrode DEL2 may include a second dummy protrusion DVP2 protruding toward the first dummy electrode DEL1. As Figure 6As shown, the first dummy electrode DEL1 may include a first dummy protrusion DVP1 protruding toward each of the second - 1st dummy electrode DEL2 - 1, the second - 2nd dummy electrode DEL2 - 2, and the second - 3rd dummy electrode DEL2 - 3. Each of the second - 1st dummy electrode DEL2 - 1, the second - 2nd dummy electrode DEL2 - 2, and the second - 3rd dummy electrode DEL2 - 3 may respectively include a second dummy protrusion DVP2 protruding toward the first dummy electrode DEL1.

[0184] As Figure 6 shown, since the first dummy protrusion DVP1 and the second dummy protrusion DVP2 face each other, when the alignment signal described later is applied to the first dummy electrode DEL1 and the second dummy electrode DEL2, the electric field is concentrated between the first dummy protrusion DVP1 and the second dummy protrusion DVP2. As a result, the second light - emitting element LD2 can be effectively aligned between the first dummy protrusion DVP1 and the second dummy protrusion DVP2. Accordingly, the second light - emitting element LD2 can be disposed between the first dummy protrusion DVP1 and the second dummy protrusion DVP2. Specifically, one second light - emitting element LD2 can be respectively disposed between the first dummy protrusion DVP1 and the second dummy protrusion DVP2.

[0185] In an embodiment of the present invention, the first dummy protrusion DVP1 may have a planar shape corresponding to the planar shape of the first protrusion VP1, and the second dummy protrusion DVP2 may have a planar shape corresponding to the planar shape of the second protrusion VP2.

[0186] By setting the planar shape of the first dummy protrusion DVP1 to correspond to the planar shape of the first protrusion VP1 and setting the planar shape of the second dummy protrusion DVP2 to correspond to the planar shape of the second protrusion VP2, the first light - emitting element LD1 disposed on the display area AA and the second light - emitting element LD2 disposed on the dummy area DA can be placed in a more similar environment. Accordingly, by measuring the contact resistance of the second light - emitting element LD2 disposed on the dummy area DA, it becomes possible to further perform qualitative analysis on the electrical environment such as the contact resistance of the first light - emitting element LD1 disposed on the display area AA.

[0187] At one end of the second light - emitting element LD2 exposed through the insulating pattern INSP, a first dummy contact electrode DCNT1 may be provided, and at the other end, a second dummy contact electrode DCNT2 may be provided. Accordingly, the second light - emitting element LD2 can be electrically connected to the first dummy electrode DEL1 and the second dummy electrode DEL2.

[0188] Figure 8is schematically shown enlarged Figure 3 A plan view of another embodiment of the display element layer of the EA1 portion, Figure 9 is based on Figure 8 Cross-sectional view along line III-III'.

[0189] Reference Figure 8 and Figure 9 According to an embodiment of the present invention, the display element layer DPL may include a first bank BNK1 and a second bank BNK2, a first electrode EL1 and a second electrode EL2, a first light-emitting element LD1, a first contact electrode CNT1 and a second contact electrode CNT2, a bank pattern BNKP, a first dummy bank DBNK1 and a second dummy bank DBNK2, a first dummy electrode DEL1, a second dummy electrode DEL2, a second light-emitting element LD2, a first dummy contact electrode DCNT1 and a second dummy contact electrode DCNT2, and an insulating pattern INSP, which are provided on a substrate SUB.

[0190] like Figure 8 As shown, the first dummy bank DBNK1 and the second dummy bank DBNK2 may be disposed on the dummy area DA in a form extending along the first direction DR1 and spaced apart from each other along the second direction DR2.

[0191] Two adjacent first and second dummy banks DBNK1 and DBNK2 on the dummy area DA may be spaced apart from each other by a predetermined distance along the second direction DR2. For example, two adjacent first and second dummy banks DBNK1 and DBNK2 may be spaced apart from each other by more than the length of the second light emitting element LD2 on the dummy area DA.

[0192] The first dummy bank DBNK1 and the second dummy bank DBNK2 may include an inorganic insulating film made of an inorganic material or an organic insulating film made of an organic material. According to embodiments, the first dummy bank DBNK1 and the second dummy bank DBNK2 may include a single-layer organic insulating film and / or a single-layer inorganic insulating film, but the present invention is not limited thereto. According to embodiments, the first dummy bank DBNK1 and the second dummy bank DBNK2 may also be configured as a multilayer film comprising at least one layer of organic insulating film and at least one layer of inorganic insulating film. However, the materials of the first dummy bank DBNK1 and the second dummy bank DBNK2 are not limited to the aforementioned embodiments. According to embodiments, the first dummy bank DBNK1 and the second dummy bank DBNK2 may also include a conductive material.

[0193] like Figure 9As shown, the first dummy bank DBNK1 and the second dummy bank DBNK2 may have a trapezoidal cross-section that becomes narrower in width toward the upper part along the third direction DR3, but is not limited thereto. As another example, the first dummy bank DBNK1 and the second dummy bank DBNK2 may have a curved surface with a cross-section such as a semi-circle or semi-ellipse that becomes narrower in width toward the upper part.

[0194] The first dummy electrode DEL1 may be disposed on the first dummy bank DBNK1, and each second dummy electrode DEL2 is disposed on the second dummy bank DBNK2. The first dummy electrode DEL1 and the second dummy electrode DEL2 may be reflective electrodes. The first dummy electrode DEL1 and the second dummy electrode DEL2 as reflective electrodes may guide the light emitted from the second light-emitting element LD2 in the direction from the substrate SUB toward the display element layer DPL (e.g., the front direction). That is, each of the first dummy bank DBNK1 and the second dummy bank DBNK2, the first dummy electrode DEL1 and the second dummy electrode DEL2 may function as a reflecting member that guides the light emitted from the second light-emitting element LD2 in a desired direction.

[0195] The shapes of the first dummy bank DBNK1 and the second dummy bank DBNK2 may be set to correspond to the shapes of the first bank BNK1 and the second bank BNK2. Accordingly, the light emitted from the second light-emitting element LD2 may have a light emission efficiency and a light emission direction similar to those of the light emitted from the first light-emitting element LD1. Therefore, the light emission efficiency and the light emission direction of each second light-emitting element LD2 provided in the dummy region DA can be observed, thereby monitoring the optical environment of the light emitted from the first light-emitting element LD1 in the display region AA.

[0196] In addition, although Figure 8 not shown, the first dummy bank DBNK1 may include a first dummy bank protrusion (not shown) protruding toward the second dummy bank DBNK2, and the second dummy bank DBNK2 includes a second dummy bank protrusion (not shown) protruding toward the first dummy bank DBNK1.

[0197] At this time, in a plane, the shape of the first dummy electrode DEL1 may correspond to the shape of the first dummy bank DBNK1, and the shape of the second dummy electrode DEL2 corresponds to the shape of the second dummy bank DBNK2. That is, the first dummy electrode DEL1 may be disposed on the first dummy bank DBNK1 in such a manner that the first dummy protrusion DVP1 overlaps with a shape corresponding to the planar shape of the first dummy bank protrusion. And each second dummy electrode DEL2 may be disposed on the second dummy bank DBNK2 in such a manner that the second dummy protrusion DVP2 overlaps with a shape corresponding to the planar shape of the second dummy bank protrusion.

[0198] Figure 10 Schematically shows an enlargedFigure 3 A plan view of another embodiment of the display element layer of the EA1 portion.

[0199] Referring to Figure 10 , according to an embodiment of the present invention, the display element layer DPL may include a first bank BNK1 and a second bank BNK2 provided on a substrate SUB, a first electrode EL1 and a second electrode EL2, a first light-emitting element LD1, a first contact electrode CNT1 and a second contact electrode CNT2, a bank pattern BNKP, a first dummy electrode DEL1, a second dummy electrode DEL2, a second light-emitting element LD2, a first dummy contact electrode DCNT1 and a second dummy contact electrode DCNT2.

[0200] In addition, although Figure 10 not shown in

[0201] In an embodiment of the present invention, the first dummy protrusion DVP1 may be set to a shape different from the planar shape of the first protrusion VP1, and the second dummy protrusion DVP2 may be set to a shape different from the planar shape of the second protrusion VP2.

[0202] As Figure 10 shown, the planar shape of the first dummy protrusion DVP1 may be different from the planar shape of the first protrusion VP1, and the planar shape of the second dummy protrusion DVP2 is different from the planar shape of the second protrusion VP2. That is, the first dummy electrode DEL1 and the second dummy electrode DEL2 may be provided on the dummy region DA in various shapes different from the first electrode EL1 and the second electrode EL2.

[0203] By setting the shapes of the first dummy electrode DEL1 and the second dummy electrode DEL2 to be different from the shapes of the first electrode EL1 and the second electrode EL2, it is possible to measure the contact resistance of the second light-emitting element LD2 according to the various shapes of the first dummy electrode DEL1 and the second dummy electrode DEL2 on the dummy region DA. And, according to the various shapes of the first dummy electrode DEL1 and the second dummy electrode DEL2, it is possible to observe the alignment degree, alignment form, etc. of the second light-emitting elements LD2 neatly arranged between the first dummy electrode DEL1 and the second dummy electrode DEL2.

[0204] Accordingly, it is possible to derive the shapes of the first dummy electrode DEL1 and the second dummy electrode DEL2 with minimized contact resistance and excellent alignment degree of the second light-emitting elements LD2, and based on this, the shapes of the first electrode EL1 and the second electrode EL2 provided on the display region AA can be designed.

[0205] Accordingly, an embodiment of the present invention has the following advantages: By diversely setting the shapes of the first dummy electrode DEL1 and the second dummy electrode DEL2 provided in the dummy region DA, and measuring the contact resistance and the degree of alignment of each of the second light-emitting elements LD2 electrically connected to the first dummy electrode DEL1 and the second dummy electrode DEL2, etc., the shapes of the first electrode EL1 and the second electrode EL2 provided in the display region AA of the display device manufactured later can be designed.

[0206] Figures 11 to 14 is a schematic plan view showing various embodiments of the display element layer of the EA2 portion magnified Figure 3 thereof.

[0207] Referring to Figures 11 to 14 , the display element layer DPL according to an embodiment of the present invention may include a first dummy electrode DEL1, a second dummy electrode DEL2, a second light-emitting element LD2, a first dummy contact electrode DCNT1, and a second dummy contact electrode DCNT2 provided in the dummy region DA. In addition, although Figures 11 to 14 not shown in the figure, the display element layer DPL may further include an insulating pattern INSP, a first dummy bank DBNK1, and a second dummy bank DBNK2 provided in the dummy region DA.

[0208] As Figures 11 to 14 shown, the dummy region DA may include sub-dummy regions SDA1, SDA2 spaced apart from each other in the first direction DR1. At this time, the second light-emitting elements LD2 may be provided in each of the sub-dummy regions SDA1, SDA2. Specifically, one second light-emitting element LD2 may be provided in each of the sub-dummy regions SDA1, SDA2.

[0209] The first dummy electrode DEL1 may extend in the first direction DR1 and overlap each of the sub-dummy regions SDA1, SDA2. One second dummy electrode DEL2 may be provided in each of the sub-dummy regions SDA1, SDA2. Accordingly, one second light-emitting element LD2 may be provided in each of the sub-dummy regions SDA1, SDA2. Based on this, as described later, the contact resistance of the second light-emitting elements LD2 provided in the sub-dummy regions SDA1, SDA2 may be measured respectively.

[0210] In various embodiments of the present invention, the shapes of the first dummy protrusions DVP1 and the second dummy protrusions DVP2 provided in at least one of the sub-dummy regions SDA1, SDA2 may be different from the shapes of the first dummy protrusions DVP1 and the second dummy protrusions DVP2 provided in the remaining regions of the sub-dummy regions SDA1, SDA2.

[0211] As Figure 11As shown, the first dummy protrusion DVP1 located in the first dummy region SDA1 may have a different shape from the first dummy protrusion DVP1 located in the second dummy region SDA2. Also, the second dummy protrusion DVP2 located in the first dummy region SDA1 may have a different shape from the second dummy protrusion DVP2 located in the second dummy region SDA2.

[0212] By setting the shapes of the first dummy protrusion DVP1 and the second dummy protrusion DVP2 provided in the dummy regions SDA1 and SDA2 to be different, it is possible to observe the alignment degree, alignment form, etc. of the second light-emitting elements LD2 according to the shapes of the first dummy protrusion DVP1 and the second dummy protrusion DVP2, and the contact resistance of each second light-emitting element LD2 can be measured.

[0213] At this time, in order to improve the reliability of the measured value, for example, Figure 11 the first dummy region SDA1 shown can be provided in multiple numbers on the dummy region DA, and the second dummy region SDA2 can be provided in multiple numbers on the dummy region DA.

[0214] In various embodiments of the present invention, the distance d1 by which the first dummy protrusion DVP1 and the second dummy protrusion DVP2 provided in at least one of the dummy regions SDA1 and SDA2 are separated from each other in the second direction DR2 may be different from the distance d2 by which the first dummy protrusion DVP1 and the second dummy protrusion DVP2 provided in the remaining regions of the dummy regions SDA1 and SDA2 are separated from each other in the second direction DR2.

[0215] As Figure 12 shown, the distance d1 by which the first dummy protrusion DVP1 and the second dummy protrusion DVP2 provided in the first dummy region SDA1 are separated from each other may be different from the distance d2 by which the first dummy protrusion DVP1 and the second dummy protrusion DVP2 provided in the second dummy region SDA2 are separated from each other.

[0216] By setting the distance between the first dummy protrusion DVP1 and the second dummy protrusion DVP2 provided in the dummy regions SDA1 and SDA2 to be different, it is possible to observe the alignment degree, alignment form, etc. of the second light-emitting elements LD2 according to the separation distance between the first dummy protrusion DVP1 and the second dummy protrusion DVP2, and the contact resistance of each second light-emitting element LD2 can be measured.

[0217] In various embodiments of the present invention, the width a1 of the portion of the first dummy protrusion DVP1 disposed in at least one of the dummy regions SDA1 and SDA2 that faces the second dummy protrusion DVP2 in a plane may be different from the width a2 of the portion of the first dummy protrusion DVP1 disposed in the remaining regions of the dummy regions SDA1 and SDA2 that faces the second dummy protrusion DVP2 in a plane.

[0218] As Figure 13 shown, the width a1 of the portion of the first dummy protrusion DVP1 disposed in the first dummy region SDA1 that faces the second dummy protrusion DVP2 in a plane may be different from the width a2 of the portion of the first dummy protrusion DVP1 disposed in the second dummy region SDA2 that faces the second dummy protrusion DVP2 in a plane.

[0219] By setting the overlapping widths of the first dummy protrusion DVP1 and the second dummy protrusion DVP2 disposed in the dummy regions SDA1 and SDA2 to be different, it is possible to observe the alignment degree, alignment form, etc. of the second light-emitting elements LD2 according to the overlapping width between the first dummy protrusion DVP1 and the second dummy protrusion DVP2, and the contact resistance of each second light-emitting element LD2 can be measured.

[0220] In various embodiments of the present invention, the first dummy electrode DEL1 may include first sub-dummy electrodes SDEL1 spaced apart from each other along the first direction DR1. As Figure 14 shown, in the first dummy region SDA1, a 1-1 sub-dummy electrode SDEL1-1 and a 2-1 dummy electrode DEL2-1 may be provided, and in the second dummy region SDA2, a 1-2 sub-dummy electrode SDEL1-2 and a 2-2 dummy electrode DEL2-2 may be provided. A second light-emitting element LD2 may be provided between each first sub-dummy electrode SDEL1 and each second dummy electrode DEL2. Specifically, one second light-emitting element LD2 may be provided between each first sub-dummy electrode SDEL1 and each second dummy electrode DEL2, respectively.

[0221] By providing one first sub-dummy electrode SDEL1 and one second dummy electrode DEL2 in each of the dummy regions SDA1 and SDA2, it is possible to more precisely measure the contact resistance of the second light-emitting elements LD2 provided in the dummy regions SDA1 and SDA2.

[0222] Figure 15a And Figure 15b is a plan view schematically showing various embodiments of a display element layer that magnifies Figure 3 the EA3 portion, Figure 16 which is based on Figure 15bCross-sectional view taken along line IV-IV'.

[0223] Referring to s and Figure 15a , in accordance with an embodiment of the present invention, the display element layer DPL may include a first dummy electrode DEL1, a second dummy electrode DEL2, a second light-emitting element LD2, a first dummy contact electrode DCNT1, and a second dummy contact electrode DCNT2 disposed on the dummy region DA. Also, the display element layer DPL may include a first dummy pad DP1 and a second dummy pad DP2 disposed on the non-display area NAA. Additionally, although Figure 15b and Figure 15a are not shown, the display element layer DPL may further include an insulating pattern INSP, a first dummy bank DBNK1, and a second dummy bank DBNK2 disposed on the dummy region DA.

[0224] In various embodiments of the present invention, the display element layer DPL may include a first dummy pad DP1 electrically connected to the first dummy electrode DEL1 and a second dummy pad DP2 connected to each second dummy electrode DEL2.

[0225] As Figure 15b shown, the first dummy electrode DEL1 may be connected to the first dummy pad DP1 disposed on the non-display area NAA. Each second dummy electrode DEL2 may be respectively connected to each second dummy pad DP2 disposed on the non-display area NAA.

[0226] The first dummy electrode DEL1 may be electrically connected to the first dummy contact electrode DCNT1, and the first dummy contact electrode DCNT1 is electrically connected to the second light-emitting element LD2. Each second dummy electrode DEL2 may be electrically connected to the second dummy contact electrode DCNT2, and the second dummy contact electrode DCNT2 is electrically connected to the second light-emitting element LD2.

[0227] The first dummy pad DP1 and the second dummy pad DP2 may each be applied with a test signal. At this time, the first test signal applied to the first dummy pad DP1 and the second test signals applied to each second dummy pad DP2 may have different voltage levels. For example, the first test signal may have a voltage level higher than that of the second test signal. The first dummy pad DP1 may be connected to the above-described first driving power supply (refer to Figure 15a and Figure 2a 's VDD), and each second dummy pad DP2 is connected to the above-described second driving power supply (refer to Figure 2b and Figure 2aof the VSS). At this time, the first driving power supply VDD connected to the first dummy pad DP1 and the second driving power supply VSS connected to each of the second dummy pads DP2 may be power supplies provided outside the display device. That is, in an embodiment of the present invention, the contact resistance of the second light-emitting element LD2 may be measured using a power supply provided outside the display device.

[0228] After applying test signals to the first dummy pad DP1 and the second dummy pads DP2, the signals output from each of the second light-emitting elements LD2 may be measured, and then the contact resistance of each of the second light-emitting elements LD2 may be calculated. For example, the contact resistance of each of the second light-emitting elements LD2 may be calculated using the current value output from each of the second light-emitting elements LD2.

[0229] Refer to Figure 2b , the first dummy electrode DEL1 may include a plurality of first sub-dummy electrodes SDEL1, and each of the plurality of first sub-dummy electrodes SDEL1 may be respectively connected to each of the first dummy pads DP1. Specifically, the 1-1 sub-dummy electrode SDEL1-1 may be connected to the 1-1 dummy pad DP1-1, and the 1-2 sub-dummy electrode SDEL1-2 may be connected to the 1-2 dummy pad DP1-2. Also, the 2-1 dummy electrode DEL2-1 may be connected to the 2-1 dummy pad DP2-1, and the 2-2 dummy electrode DEL2-2 may be connected to the 2-2 dummy pad DP2-2.

[0230] Accordingly, by applying test signals to each of the first dummy pad DP1 and the second dummy pads DP2, it is possible to easily measure the contact resistance of the second light-emitting element LD2.

[0231] As Figure 15b shown, a bridge pattern BRP may be provided at a portion where the first sub-dummy electrode SDEL1 and the second dummy electrode DEL2 cross. Refer to Figure 15b , the bridge pattern BRP may be provided on the insulating film INS, and through a contact hole penetrating the insulating film INS, the 1-1 dummy pad DP1-1 and the 1-1 sub-dummy electrode SDEL1-1 may be electrically connected.

[0232] In various embodiments of the present invention, the first dummy pad DP1 and the second dummy pads DP2 may be provided on a non-display area NAA adjacent to the dummy area DA. By arranging the first dummy pad DP1 and the second dummy pads DP2 adjacent to the dummy area DA where the first dummy electrode DEL1 and the second dummy electrode DEL2 are provided, noise may be reduced when measuring the contact resistance of the second light-emitting element LD2. Accordingly, the contact resistance of each of the second light-emitting elements LD2 can be measured more accurately.

[0233] Figure 16The figure is a cross-sectional view showing a display device according to an embodiment of the present invention.

[0234] As Figure 17 shown, the display device may include a substrate SUB, a pixel circuit layer PCL, and a display element layer DPL.

[0235] The pixel circuit layer PCL may include a buffer layer BFL, a first transistor T1, a second transistor T2, and a driving voltage wiring DVL.

[0236] The buffer layer BFL may be disposed on one surface of the substrate SUB. The buffer layer BFL may prevent impurities from diffusing into the first transistor T1 and the second transistor T2. The buffer layer BFL may be provided as a single layer, but may also be provided as a multi-layer of at least two layers. In the case where the buffer layer BFL is provided as a multi-layer, each layer may be formed of the same material or formed of different materials. The buffer layer BFL may also be omitted depending on the material of the substrate SUB and the process conditions.

[0237] The first transistor T1 may be a driving transistor electrically connected to a first light-emitting element LD1 to drive the first light-emitting element LD1. The second transistor T2 may be a switching transistor electrically connected to the first transistor T1 to switch the first transistor T1.

[0238] Each of the first transistor T1 and the second transistor T2 may include a semiconductor layer SCL, a gate electrode GE, a source electrode SE, and a drain electrode DE.

[0239] The semiconductor layer SCL may be disposed on the buffer layer BFL. The semiconductor layer SCL may include a source region in contact with the corresponding source electrode SE and a drain region in contact with the corresponding drain electrode DE. The region between the source region and the drain region may be a channel region. The semiconductor layer SCL may be a semiconductor pattern formed of polysilicon, amorphous silicon, an oxide semiconductor, etc. The channel region may be a semiconductor pattern doped with impurities. The impurities may be impurities such as n-type impurities, p-type impurities, other metals, etc.

[0240] The gate electrode GE may be disposed on the corresponding semiconductor layer SCL with a first gate insulating film GI1 therebetween.

[0241] Each of the source electrode SE and the drain electrode DE included in the first transistor T1 may be connected to the source region and the drain region of the corresponding semiconductor layer SCL through contact holes penetrating through a second gate insulating film GI2 and the first gate insulating film GI1.

[0242] The source electrode SE and the drain electrode DE included in the second transistor T2 can each be connected to the source region and the drain region of the corresponding semiconductor layer SCL through contact holes penetrating the second gate insulating film GI2 and the first gate insulating film GI1.

[0243] The driving voltage wiring DVL can be provided on the interlayer insulating film ILD, but the position of the driving voltage wiring DVL is not limited. The driving voltage wiring DVL can be connected to a second driving power supply (refer to Figure 17 and Figure 2a VSS), and a signal corresponding to the driving voltage can be supplied from the driving unit to the driving voltage wiring DVL.

[0244] The pixel circuit layer PCL may further include a protective layer PSV covering the first transistor T1 and the second transistor T2. The protective layer PSV can be provided in a form including an organic insulating film, an inorganic insulating film, or the organic insulating film disposed on the inorganic insulating film. Here, the inorganic insulating film may include at least one of silicon oxide (SiO x ), silicon nitride (SiN x ), silicon oxynitride (SiON), and metal oxides such as AlO x . The organic insulating film may include an organic insulating substance capable of transmitting light. For example, the organic insulating film may include at least one of polyacrylates resin, epoxy resin, phenolic resin, polyamides resin, polyimides resin, unsaturated polyesters resin, poly-phenylene ethers resin, poly-phenylenesulfides resin, and benzocyclobutene resin.

[0245] Moreover, the case of a thin film transistor having a top gate structure for the transistors T1 and T2 has been described as an example, but the present invention is not limited thereto. According to an embodiment, the transistors T1 and T2 may also be thin film transistors having a bottom gate structure.

[0246] Refer to Figure 2b, the display element layer DPL may include a first bank BNK1 and a second bank BNK2, a first electrode EL1 and a second electrode EL2, a first light-emitting element LD1, a first contact electrode CNT1 and a second contact electrode CNT2, a bank pattern BNKP, a first dummy electrode DEL1, a 2-1st dummy electrode DEL2-1, a second light-emitting element LD2, a first dummy contact electrode DCNT1 and a second dummy contact electrode DCNT2, an insulating film INS, and an insulating pattern INSP. Although Figure 17 is not shown in the figure, the display element layer DPL may further include a first dummy bank DBNK1 and a second dummy bank DBNK2 provided on the dummy region DA. Figure 17 The 2-1st dummy electrode DEL2-1 shown may have the same configuration as the 2-1st dummy electrode DEL2-1 described with reference to Figure 17 and Figure 4 .

[0247] The first electrode EL1 may be provided on the first bank BNK1, and the second electrode EL2 may be provided on the second bank BNK2. At this time, the shape of the first electrode EL1 may correspond to the shape of the first bank BNK1, and the shape of the second electrode EL2 may correspond to the shape of the second bank BNK2. The first electrode EL1 may include a first protruding portion VP1 protruding toward the second electrode EL2, and the second electrode EL2 may include a second protruding portion VP2 protruding toward the first electrode EL1.

[0248] One of the first electrode EL1 and the second electrode EL2 may be electrically connected to at least one of the plurality of transistors included in the pixel circuit layer PCL.

[0249] For example, the second electrode EL2 may be electrically connected to the drain electrode DE of the first transistor T1 through a contact hole penetrating the protective layer PSV and the interlayer insulating film ILD. The source electrode SE of the first transistor T1 may be electrically connected to a first driving power supply (VDD in reference to Figure 5 and Figure 2a ). Accordingly, the second electrode EL2 may receive a signal from the first transistor T1.

[0250] The first electrode EL1 may be electrically connected to the driving voltage wiring DVL through a contact hole penetrating the protective layer PSV. The driving voltage wiring DVL may be electrically connected to a second driving power supply VSS. Accordingly, the first electrode EL1 may receive a signal from the driving voltage wiring DVL.

[0251] An insulating film INS may be provided on one surface of the protective layer PSV provided with the first bank BNK1 and the second bank BNK2 and the first electrode EL1 and the second electrode EL2. The first light-emitting element LD1 may be provided on the insulating film INS.

[0252] The insulating pattern INSP can be disposed on the first light-emitting element LD1 to fix the position of the first light-emitting element LD1. One end portion and the other end portion of the first light-emitting element LD1 can be exposed by means of the insulating pattern INSP.

[0253] The first contact electrode CNT1 and the second contact electrode CNT2 can be disposed on the insulating film INS, and one end portion of the first light-emitting element LD1 exposed through the insulating pattern INSP is in contact with the first contact electrode CNT1, and the other end portion of the first light-emitting element LD1 exposed through the insulating pattern INSP is in contact with the second contact electrode CNT2. Also, through the contact hole penetrating the insulating film INS, the first contact electrode CNT1 can be connected to the first electrode EL1, and the second contact electrode CNT2 is connected to the second electrode EL2.

[0254] Accordingly, the first light-emitting element LD1 can receive a predetermined voltage through the first electrode EL1 and the second electrode EL2. If an electric field above a predetermined voltage is applied to both end portions of the first light-emitting element LD1, electron-hole pairs are combined in the active layer 12 of the first light-emitting element LD1, and thus the first light-emitting element LD1 emits light.

[0255] Also, since the first contact electrode CNT1 is connected to the first electrode EL1 and the second contact electrode CNT2 is connected to the second electrode EL2, by reducing the wiring resistance of each of the first contact electrode CNT1 and the second contact electrode CNT2, defective driving of the first light-emitting element LD1 due to signal delay can be minimized.

[0256] The light emitted from both end portions of the first light-emitting element LD1 can be reflected by the first electrode EL1 and the second electrode EL2, and then guided to a direction (e.g., the front direction) upward with respect to the third direction DR3 as a reference.

[0257] As Figure 2b shown, the first dummy electrode DEL1 and the second dummy electrode DEL2-1 can be disposed on the protective layer PSV overlapping the dummy region DA of the substrate SUB. The second light-emitting element LD2 can be disposed on the insulating film INS, and one end portion of the second light-emitting element LD2 is connected to the first dummy contact electrode DCNT1, and the other end portion is connected to the second dummy contact electrode DCNT2. Through the contact hole penetrating the insulating film INS, the first dummy contact electrode DCNT1 can be connected to the first dummy electrode DEL1, and the second dummy contact electrode DCNT2 is connected to the second dummy electrode DEL2-1.

[0258] The first dummy electrode DEL1 and the second - 1 dummy electrode DEL2 - 1 can be set to a state where they are not electrically connected to the plurality of transistors included in the pixel circuit layer PCL. That is, when the display device is driven, the second light - emitting element LD2 does not emit light, and the dummy area DA can correspond to a non - light - emitting area.

[0259] On the protective layer PSV equipped with the first electrode EL1 and the second electrode EL2, the first contact electrode CNT1 and the second contact electrode CNT2, the first light - emitting element LD1, the first dummy electrode DEL1, the second - 1 dummy electrode DEL2 - 1, the first dummy contact electrode DCNT1 and the second dummy contact electrode DCNT2, and the second light - emitting element LD2, an encapsulation layer INC can be provided. An outer coating layer (not shown) can be provided on the encapsulation layer INC. The outer coating layer can be an encapsulation layer that prevents the penetration of oxygen, moisture, etc. into the light - emitting element LD.

[0260] Figure 17 It is a plan view sequentially showing a manufacturing method of a display device according to an embodiment of the present invention. In particular, Figures 18a to 18g It is a plan view sequentially showing a manufacturing method of a display device including a display element layer DPL in which a first dummy electrode DEL1 and a second dummy electrode DEL2 are provided in a shape corresponding to that of the first electrode EL1 and the second electrode EL2.

[0261] Referring to Figures 18a to 18g , the substrate SUB can include a display area AA and a non - display area NAA surrounding the display area AA. The non - display area NAA can include a dummy area DA located on at least one side of the display area AA.

[0262] As Figure 18a shown, on the display area AA of the substrate SUB, a first bank BNK1 and a second bank BNK2 that extend along a first direction DR1 and are spaced apart from each other along a second direction DR2 can be formed. A bank pattern BNKP that extends along the first direction DR1 can be formed on the display area AA adjacent to the dummy area DA. In addition, a first dummy bank DBNK1 and a second dummy bank DBNK2 that extend along the first direction DR1 and are spaced apart from each other along the second direction DR2 can be formed on the dummy area DA of the substrate SUB.

[0263] As Figure 18a shown, the first electrode EL1 can be formed on the first bank BNK1, and the second electrode EL2 can be formed on the second bank BNK2. Accordingly, the first electrode EL1 and the second electrode EL2 can extend along the first direction DR1 and be spaced apart from each other along the second direction DR2 on the display area AA.

[0264] The first electrode EL1 can be connected to the connection wiring CNL or formed integrally with the connection wiring CNL. The connection wiring CNL can be electrically connected to the above-described driving voltage wiring DVL.

[0265] A first dummy electrode DEL1 can be formed on the first dummy bank DBNK1, and a second dummy electrode DEL2 can be formed on the second dummy bank DBNK2. Accordingly, the first dummy electrode DEL1 and the second dummy electrode DEL2 can extend in a first direction DR1 and be spaced apart from each other in a second direction DR2 in the dummy region DA.

[0266] In various embodiments of the present invention, in the step of forming the first dummy electrode DEL1 and the second dummy electrode DEL2, a first dummy pad DP1 electrically connected to the first dummy electrode DEL1 and a second dummy pad DP2 electrically connected to the second dummy electrode DEL2 can be formed.

[0267] The first dummy pad DP1 can be connected to the first dummy electrode DEL1 or formed integrally with the first dummy electrode DEL1. Also, the second dummy pad DP2 can be connected to the second dummy electrode DEL2 or formed integrally with the second dummy electrode DEL2.

[0268] As Figure 18b shown, the connection wiring CNL, the first dummy pad DP1, and the second dummy pad DP2 can be formed in the non-display area NAA. In particular, the first dummy pad DP1 and the second dummy pad DP2 can be formed in the non-display area NAA adjacent to the dummy region DA.

[0269] In various embodiments of the present invention, a first protruding portion VP1 protruding toward the second electrode EL2 can be formed on the first electrode EL1, and a second protruding portion VP2 protruding toward the first electrode EL1 can be formed on the second electrode EL2. Also, a first dummy protruding portion DVP1 protruding toward the second dummy electrode DEL2 can be formed on the first dummy electrode DEL1, and a second dummy protruding portion DVP2 protruding toward the first dummy electrode DEL1 can be formed on the second dummy electrode DEL2.

[0270] The first protruding portion VP1 and the second protruding portion VP2 can be formed to face each other. Since the first protruding portion VP1 and the second protruding portion VP2 face each other, the electric field can be concentrated between the first protruding portion VP1 and the second protruding portion VP2. Accordingly, the first light-emitting elements LD1 can be effectively arranged neatly between the first protruding portion VP1 and the second protruding portion VP2.

[0271] The first dummy protrusion DVP1 and the second dummy protrusion DVP2 may also be formed to face each other. Similar to the above description, the second light-emitting element LD2 can be effectively and neatly arranged between the first dummy protrusion DVP1 and the second dummy protrusion DVP2.

[0272] Although not illustrated in Figure 18b a first bank protrusion (not illustrated) protruding toward the second bank BNK2 may be formed in the first bank BNK1, and a second bank protrusion (not illustrated) protruding toward the first bank BNK1 may be formed in the second bank BNK2. At this time, the first electrode EL1 may be formed on the first bank BNK1 in such a manner that the first protrusion VP1 overlaps with a shape corresponding to the planar shape of the first bank protrusion. Also, the second electrode EL2 may be formed on the second bank BNK1 in such a manner that the second protrusion VP2 overlaps with a shape corresponding to the planar shape of the second bank protrusion.

[0273] A first dummy bank protrusion (not illustrated) protruding toward the second dummy bank DBNK2 may be formed in the first dummy bank DBNK1, and a second dummy bank protrusion (not illustrated) protruding toward the first dummy bank DBNK1 may be formed in the second dummy bank DBNK2. At this time, the first dummy electrode DEL1 may be formed on the first dummy bank DBNK1 in such a manner that the first dummy protrusion DVP1 overlaps with a shape corresponding to the planar shape of the first dummy bank protrusion. Also, the second dummy electrode DEL2 may be formed on the second dummy bank DBNK2 in such a manner that the second dummy protrusion DVP2 overlaps with a shape corresponding to the planar shape of the second dummy bank protrusion.

[0274] An insulating film INS may be formed on the substrate SUB on which the first electrode EL1, the second electrode EL2, the first dummy electrode DEL1, and the second dummy electrode DEL2 are formed. The insulating film INS may be formed to cover the first electrode EL1, the second electrode EL2, the first dummy electrode DEL1, and the second dummy electrode DEL2.

[0275] Referring to Figures 18a to 18g , a light-emitting element LD may be provided on the insulating film INS. For example, the light-emitting element LD may be provided on the light-emitting regions and the dummy regions DA of each pixel PXL by an inkjet printing method, a slot coating method, or various other methods. As an example, the light-emitting element LD may be mixed with a volatile solvent and supplied to the light-emitting regions and the dummy regions DA of each pixel PXL by an inkjet printing method or a slot coating method.

[0276] For example, an inkjet nozzle may be arranged on the insulating film INS, and a solvent mixed with a plurality of light-emitting elements LD is supplied onto the light-emitting regions and dummy regions DA of each pixel PXL through the inkjet nozzle. Here, the solvent may be any one or more of acetone, water, ethanol, and toluene, but the present invention is not limited thereto. For example, the solvent may be in the form of ink or paste. The method of disposing the light-emitting elements LD on the light-emitting regions and dummy regions DA of each pixel PXL is not limited to the above-described embodiments, and the method of disposing the light-emitting elements LD may be variously changed. The light-emitting region of each pixel PXL described above is a region of the display region AA, and as an example, it is a pixel region where each pixel PXL is provided, and may be a region where light is emitted by the light-emitting element LD provided in the display region AA, but the present invention is not limited thereto.

[0277] After the light-emitting elements LD are disposed on the light-emitting regions and dummy regions DA of each pixel PXL, the solvent can be removed.

[0278] Referring to Figure 18c and Figure 18c , an alignment signal is applied to the first electrode EL1 and the second electrode EL2, so that the first light-emitting element LD1 can be aligned neatly between the first electrode EL1 and the second electrode EL2.

[0279] The first alignment signal applied to the first electrode EL1 and the second alignment signal applied to the second electrode EL2 may be signals having a voltage difference and / or a phase difference such that the first light-emitting element LD1 can be aligned neatly between the first electrode EL1 and the second electrode EL2. For example, the first alignment signal and the second alignment signal may have different voltage levels. And at least a part of the first alignment signal and the second alignment signal may be an alternating current signal, but the present invention is not limited thereto.

[0280] Moreover, when aligning the light-emitting elements LD, by controlling the alignment signal (or alignment voltage) applied to the first electrode EL1 and the second electrode EL2 or forming a magnetic field, the first light-emitting element LD1 can be aligned neatly while being relatively deflected between the first electrode EL1 and the second electrode EL2. For example, it may be aligned neatly in a deflected manner such that one end of the first light-emitting element LD1 faces the first electrode EL1 and the other end faces the second electrode EL2. On the contrary, it may also be aligned neatly in a deflected manner such that one end of the first light-emitting element LD1 faces the second electrode EL2 and the other end faces the first electrode EL1.

[0281] Further, an alignment signal is applied to the first dummy electrode DEL1 and the second dummy electrode DEL2, so that the second light-emitting element LD2 can be aligned between the first dummy electrode DEL1 and the second dummy electrode DEL2. The method of aligning the second light-emitting element LD2 between the first dummy electrode DEL1 and the second dummy electrode DEL2 can be the same as the method of aligning the first light-emitting element LD1 between the first electrode EL1 and the second electrode EL2 described above.

[0282] As an alignment signal is applied to the first electrode EL1 and the second electrode EL2, the first light-emitting element LD1 can be aligned between the first protrusion VP1 and the second protrusion VP2. Further, as an alignment signal is applied to the first dummy electrode DEL1 and the second dummy electrode DEL2, the second light-emitting element LD2 can be aligned between the first dummy protrusion DVP1 and the second dummy protrusion DVP2.

[0283] In various embodiments of the present invention, the second dummy electrode DEL2 can be cut to form second sub-dummy electrodes SDEL2 spaced apart from each other along the first direction DR1. At this time, a partial region of the insulating film INS and a partial region of the second dummy electrode DEL2 can be cut together.

[0284] As Figure 18d shown, the second dummy electrode DEL2 can be cut in such a way that one second light-emitting element LD2 is provided between each second sub-dummy electrode SDEL2 and the first dummy electrode DEL1.

[0285] Specifically, in the step of cutting the second dummy electrode DEL2, the second dummy electrode DEL2 can be cut in such a way that one second dummy protrusion DVP2 is provided in each second sub-dummy electrode SDEL2. Accordingly, one second light-emitting element LD2 can be provided between the first dummy protrusion DVP1 and the second dummy protrusion DVP2.

[0286] Further, as the second dummy electrode DEL2 is cut into a plurality of second sub-dummy electrodes SDEL2, one second dummy pad DP2 can be provided in each second sub-dummy electrode SDEL2.

[0287] Referring to Figure 18e , an insulating pattern INSP can be formed on the light-emitting element LD. The insulating pattern INSP can be provided on the light-emitting element LD in a state continuous along the first direction DR1. The positions of the first light-emitting element LD1 aligned between the first electrode EL1 and the second electrode EL2 and the second light-emitting element LD2 aligned between the first dummy electrode DEL1 and the second sub-dummy electrode SDEL2 can be fixed by means of the insulating pattern INSP.

[0288] Referring to Figure 18f , a first dummy contact electrode DCNT1 for electrically connecting the first dummy electrode DEL1 and the second light-emitting element LD2 and a second dummy contact electrode DCNT2 for electrically connecting the second sub-dummy electrode SDEL2 and the second light-emitting element LD2 can be formed.

[0289] The first dummy contact electrode DCNT1 can be connected to the first dummy electrode DEL1 through a contact hole penetrating the insulating film INS and contact one end portion of the second light-emitting element LD2 exposed through the insulating pattern INSP. Also, the second dummy contact electrode DCNT2 can be connected to each second sub-dummy electrode SDEL2 through a contact hole penetrating the insulating film INS and contact the other end portion of the second light-emitting element LD2 exposed through the insulating pattern INSP. Accordingly, the first dummy electrode DEL1 and the second sub-dummy electrode SDEL2 can be electrically connected to the second light-emitting element LD2.

[0290] A first contact electrode CNT1 for electrically connecting the first electrode EL1 and the first light-emitting element LD1 and a second contact electrode CNT2 for electrically connecting the second electrode EL2 and the first light-emitting element LD1 can be formed.

[0291] The first contact electrode CNT1 can be connected to the first electrode EL1 through a contact hole penetrating the insulating film INS and contact one end portion of the first light-emitting element LD1 exposed through the insulating pattern INSP. Also, the second contact electrode CNT2 can be connected to the second electrode EL2 through a contact hole penetrating the insulating film INS and contact the other end portion of the first light-emitting element LD1 exposed through the insulating pattern INSP. Accordingly, the first electrode EL1 and the second electrode EL2 can be electrically connected to the first light-emitting element LD1.

[0292] In various embodiments of the present invention, in the step of measuring the contact resistance of the second light-emitting element LD2, a test signal can be applied to each of the first dummy pad DP1 and the second dummy pad DP2, and the signal output from each second light-emitting element LD2 can be measured.

[0293] The first test signal applied to the first dummy pad DP1 and the second test signal applied to each second dummy pad DP2 can have different voltage levels. For example, the first test signal can have a voltage level higher than that of the second test signal. The first dummy pad DP1 can be connected to the first driving power supply VDD described above, and each second dummy pad DP2 is connected to the second driving power supply VSS described above. At this time, the first driving power supply VDD connected to the first dummy pad DP1 and the second driving power supply VSS connected to each second dummy pad DP2 can be power supplies provided outside the display device.

[0294] After applying a test signal to the first dummy pad DP1 and the second dummy pad DP2, the signals output from the respective second light-emitting elements LD2 can be measured, and then the contact resistance of each second light-emitting element LD2 can be calculated. For example, the contact resistance of each second light-emitting element LD2 can be calculated using the current value output from each second light-emitting element LD2.

[0295] As described above Figure 18g 、 Figure 4 and Figure 6 As shown, a first dummy electrode DEL1 and a second sub-dummy electrode SDEL2 having shapes corresponding to the shapes of the first electrode EL1 and the second electrode EL2 provided on the display area AA can be formed on the dummy area DA. After that, by measuring the contact resistance of each second light-emitting element LD2 electrically connected to the first dummy electrode DEL1 and the second sub-dummy electrode SDEL2 on the dummy area DA, the contact resistance of the first light-emitting element LD1 provided on the display area AA can be monitored without separately measuring the contact resistance of the first light-emitting element LD1.

[0296] As described above Figure 8 、 Figure 10 As shown, a first dummy electrode DEL1 and a second sub-dummy electrode SDEL2 having shapes different from the shapes of the first electrode EL1 and the second electrode EL2 provided on the display area AA can be formed on the dummy area DA. After that, by measuring the contact resistance of each second light-emitting element LD2 electrically connected to the first dummy electrode DEL1 and the second sub-dummy electrode SDEL2 on the dummy area DA, the contact resistance of each second light-emitting element LD2 according to the shapes of the first dummy electrode DEL1 and the second sub-dummy electrode SDEL2 can be measured.

[0297] As described above s As shown, by variously setting the distance between the first dummy protrusion DVP1 and the second dummy protrusion DVP2 provided in the sub-dummy areas SDA1 and SDA2, the contact resistance of each second light-emitting element LD2 according to the distance between the first dummy protrusion DVP1 and the second dummy protrusion DVP2 can be measured.

[0298] As described above Figure 11 Figure 12 Figure 13 As shown, by variously setting the overlapping width of the first dummy protrusion DVP1 and the second dummy protrusion DVP2 provided in the sub-dummy areas SDA1 and SDA2, the contact resistance of each second light-emitting element LD2 according to the overlapping width of the first dummy protrusion DVP1 and the second dummy protrusion DVP2 can be measured.

[0299] Therefore, according to an embodiment of the present invention, by measuring the contact resistance of each second light-emitting element LD2 provided in the dummy region DA, it is possible to monitor the electrical environment of the first light-emitting element LD1 provided in the display region AA, or it is easy to observe the change in the contact resistance of the second light-emitting element LD2 according to the shapes of the first dummy electrode DEL1 and the second dummy electrode DEL2.

[0300] The above detailed description is only an example and explanation of the present invention. Also, the above content is only to represent and explain the preferred embodiments of the present invention. As described above, the present invention can be used in various other combinations, changes, and environments, and can be changed or modified within the scope of the concept of the present invention disclosed in this specification, the scope equivalent to the disclosed content, and / or the technical or knowledge scope of those skilled in the art. Therefore, the above detailed description of the invention is not intended to limit the present invention to the disclosed implementation state. Also, the scope of the claims should be interpreted to include other embodiments.

Claims

1. A display device, comprising: a substrate including a display area and a non-display area surrounding the display area; and a display element layer disposed on the substrate, wherein the display element layer includes: a first electrode and a second electrode extending along a first direction and spaced apart from each other along a second direction different from the first direction; a first light-emitting element electrically connected to the first electrode and the second electrode; a first dummy electrode extending along the first direction and spaced apart from the first electrode and the second electrode; a second dummy electrode spaced apart from each other along the first direction and spaced apart from the first electrode, the second electrode, and the first dummy electrode; and a second light-emitting element electrically connected to the first dummy electrode and the second dummy electrode, wherein the non-display area includes a dummy area located on at least one side of the display area, the first electrode, the second electrode, and the first light-emitting element are disposed on the display area, the first dummy electrode, the second dummy electrode, and the second light-emitting element are disposed on the dummy area, the first electrode and the second electrode are arranged on the same layer, and the first light-emitting element is arranged between the first electrode and the second electrode.

2. The display device according to claim 1, wherein the first electrode includes a first protrusion protruding toward the second electrode, the second electrode includes a second protrusion protruding toward the first electrode, the first light-emitting element is disposed between the first protrusion and the second protrusion.

3. The display device according to claim 1, wherein the second light-emitting element is disposed between each of the second dummy electrodes and the first dummy electrode.

4. The display device according to claim 2, wherein the first dummy electrode includes a first dummy protrusion protruding toward each of the second dummy electrodes, each of the second dummy electrodes includes a second dummy protrusion protruding toward the first dummy electrode.

5. The display device according to claim 4, wherein the first dummy protrusion has a planar shape corresponding to the planar shape of the first protrusion, the second dummy protrusion has a planar shape corresponding to the planar shape of the second protrusion.

6. The display device according to claim 4, wherein the planar shape of the first dummy protrusion is different from the planar shape of the first protrusion, the planar shape of the second dummy protrusion is different from the planar shape of the second protrusion.

7. The display device according to claim 4, wherein the second light-emitting element is disposed between the first dummy protrusion and the second dummy protrusion.

8. The display device according to claim 4, wherein the dummy area includes sub-dummy areas spaced apart from each other along the first direction, the second light-emitting element is disposed in each of the sub-dummy areas.

9. The display device according to claim 8, wherein The shapes of the first dummy protrusion and the second dummy protrusion provided in at least one of the sub-dummy regions are different from the shapes of the first dummy protrusion and the second dummy protrusion provided in the remaining regions of the sub-dummy regions.

10. The display device according to claim 8, wherein, The distance between the first dummy protrusion and the second dummy protrusion provided in at least one of the sub-dummy regions and separated from each other in the second direction is different from the distance between the first dummy protrusion and the second dummy protrusion provided in the remaining regions of the sub-dummy regions and separated from each other in the second direction.

11. The display device according to claim 8, wherein, The width of the portion of the first dummy protrusion provided in at least one of the sub-dummy regions that faces the second dummy protrusion in a plane is different from the width of the portion of the first dummy protrusion provided in the remaining regions of the sub-dummy regions that faces the second dummy protrusion in a plane.

12. The display device according to claim 1, wherein, The first dummy electrode includes first sub-dummy electrodes separated from each other in the first direction, A second light-emitting element is provided between each of the first sub-dummy electrodes and each of the second dummy electrodes.

13. The display device according to claim 1, wherein, The display element layer further includes: A first dummy pad electrically connected to the first dummy electrode; A second dummy pad electrically connected to each of the second dummy electrodes.

14. The display device according to claim 1, wherein, The display element layer further includes: A first dummy contact electrode covering at least a part of the first dummy electrode and electrically connecting the first dummy electrode and the second light-emitting element; and A second dummy contact electrode covering at least a part of the second dummy electrode and electrically connecting the second dummy electrode and the second light-emitting element.

15. A method for manufacturing a display device, comprising the following steps: Forming a first electrode, a second electrode, a first dummy electrode, and a second dummy electrode on a substrate, the first electrode, the second electrode, the first dummy electrode, and the second dummy electrode extending in a first direction and separated from each other in a second direction different from the first direction; Providing a light-emitting element on the substrate including the first electrode, the second electrode, the first dummy electrode, and the second dummy electrode; Applying an alignment signal to the first electrode and the second electrode, and then aligning the first light-emitting elements neatly between the first electrode and the second electrode, applying an alignment signal to the first dummy electrode and the second dummy electrode, and then aligning the second light-emitting elements neatly between the first dummy electrode and the second dummy electrode; Forming second sub-dummy electrodes separated from each other in the first direction by cutting the second dummy electrode; Forming a first dummy contact electrode electrically connecting the first dummy electrode and the second light-emitting element and a second dummy contact electrode electrically connecting the second sub-dummy electrode and the second light-emitting element; And Measuring the contact resistance of the second light-emitting element, Wherein, the substrate includes a display area and a non-display area surrounding the display area, The non-display area includes dummy areas located on at least one side of the display area. The first electrode, the second electrode, and the first light-emitting element are disposed on the display area. The first dummy electrode, the second dummy electrode, and the second light-emitting element are disposed on the dummy area.

16. The manufacturing method of the display device according to claim 15, wherein The second light-emitting element is disposed between each of the second sub-dummy electrodes and the first dummy electrode.

17. The manufacturing method of the display device according to claim 15, wherein In the step of forming the first dummy electrode and the second dummy electrode, A first dummy protrusion protruding toward the second dummy electrode is formed on the first dummy electrode. A second dummy protrusion protruding toward the first dummy electrode is formed on the second dummy electrode.

18. The manufacturing method of the display device according to claim 17, wherein In the step of cutting the second dummy electrode, The second dummy electrode is cut in such a manner that each of the second sub-dummy electrodes is provided with one of the second dummy protrusions, So that the second light-emitting element is disposed between the first dummy protrusion and the second dummy protrusion.

19. The manufacturing method of the display device according to claim 15, wherein In the step of forming the first dummy electrode and the second dummy electrode, a first dummy pad electrically connected to the first dummy electrode and a second dummy pad electrically connected to the second dummy electrode are formed. In the step of cutting the second dummy electrode, the second dummy electrode is cut in such a manner that each of the second sub-dummy electrodes is provided with one of the second dummy pads.

20. The manufacturing method of the display device according to claim 19, wherein In the step of measuring the contact resistance of the second light-emitting element, A test signal is applied to each of the first dummy pad and the second dummy pad, and the signal output from the second light-emitting element is measured.

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