Display device and method for manufacturing the same

Abstract

The present application relates to a display device and a method for manufacturing a display device. A display device according to an embodiment of the present disclosure includes a substrate and a display element layer disposed on a first surface of the substrate and including a plurality of light-emitting elements. The display element layer may include: a first electrode and a second electrode, each configured to include a main body portion extending in a first direction and spaced apart from each other in a second direction different from the first direction; and a third electrode, configured to include a main body portion extending in a first direction, and facing the second electrode and the first electrode interposed between the third electrode and the second electrode. The first electrode also includes a first protrusion protruding toward the second electrode, the second electrode also includes a second protrusion protruding toward the first electrode, and the first protrusion and the second protrusion are alternately arranged in the first direction. Each of the light-emitting elements may be disposed between the first protrusion and the second protrusion, and the first end of each of the light-emitting elements may be aligned toward the main body portion of one of the first electrode and the second electrode.

Description

Technical Field

[0001] Various embodiments of the present disclosure are directed to a display device and a method for manufacturing the display device. Background Art

[0002] Light emitting diodes (hereinafter, referred to as LEDs) exhibit relatively good durability even under severe environmental conditions and have excellent performance in terms of life span and brightness. Recently, research has been actively conducted on the application of such LEDs in various display devices.

[0003] As part of this research, a technology for manufacturing ultra-small rod-type LEDs as small as micrometer- or nanometer-scale sizes has been developed using an inorganic crystal structure (e.g., a structure in which a nitride-based semiconductor is deposited). For example, the rod-type LED can be manufactured in a size small enough to form a pixel of a self-emissive display device, etc. Summary of the invention

[0004] Technical issues

[0005] The technical object of the present disclosure is to provide a display device having an excellent degree of alignment of light emitting elements and a method for manufacturing the display device.

[0006] Technical Solution

[0007] A display device according to an embodiment of the present disclosure may include: a substrate; and a display element layer, which is disposed on a first surface of the substrate and includes a plurality of light-emitting elements. The display element layer may include: a first electrode and a second electrode, each configured to include a main body portion extending in a first direction and spaced apart from each other in a second direction different from the first direction; and a third electrode, configured to include a main body portion extending in the first direction and facing the second electrode, and the first electrode is interposed between the second electrode and the third electrode. The first electrode may also include a first protrusion protruding toward the second electrode, the second electrode may also include a second protrusion protruding toward the first electrode, and the first protrusion and the second protrusion may be arranged alternately in the first direction. Each of the light-emitting elements may be disposed between the first protrusion and the second protrusion, and the first end of each of the light-emitting elements is aligned toward the main body portion of one of the first electrode and the second electrode.

[0008] In the embodiment of the present disclosure, the first to third electrodes and the light emitting element may be provided on the same surface of the substrate.

[0009] In an embodiment of the present disclosure, the display element layer may further include: a first contact electrode configured to electrically connect at least one of the first electrode and the third electrode to the light emitting element; and a second contact electrode configured to electrically connect the second electrode to the light emitting element.

[0010] In an embodiment of the present disclosure, the first contact electrode may include a plurality of first sub-contact electrodes connected to a portion of the first electrode adjacent to the light-emitting element and spaced apart from each other in a first direction, and the second contact electrode may include a plurality of second sub-contact electrodes connected to a portion of the second electrode adjacent to the light-emitting element and spaced apart from each other in the first direction.

[0011] In an embodiment of the present disclosure, the display element layer may further include an insulating layer disposed on the first electrode and the second electrode, wherein the third electrode and the light emitting element may be disposed on the insulating layer.

[0012] In an embodiment of the present disclosure, the third electrode may include a third protrusion protruding toward the second electrode.

[0013] In an embodiment of the present disclosure, the display element layer may further include: a first contact electrode configured to electrically connect the light emitting element and the third protrusion to each other; and a second contact electrode configured to electrically connect the light emitting element to the second electrode.

[0014] In an embodiment of the present disclosure, the first protrusion may include a first end adjacent to the main body portion of the second electrode and a second end adjacent to the main body portion of the first electrode, the second protrusion may include a first end adjacent to the main body portion of the first electrode and a second end adjacent to the main body portion of the second electrode, and in the first direction, the width of each of the first ends is greater than the width of each of the second ends.

[0015] In an embodiment of the present disclosure, the display element layer may further include: a fourth electrode configured to include a main body portion extending in the first direction and facing the first electrode, with the second electrode interposed between the first electrode and the fourth electrode.

[0016] In the embodiment of the present disclosure, the first to fourth electrodes and the light emitting element may be provided on the same surface of the substrate.

[0017] In an embodiment of the present disclosure, the display element layer may further include: a first contact electrode configured to electrically connect at least one of the first electrode and the third electrode to the light emitting element; and a second contact electrode configured to electrically connect at least one of the second electrode and the fourth electrode to the light emitting element.

[0018] In an embodiment of the present disclosure, in a direction from the substrate to the display element layer, the first electrode and the second electrode may be arranged on a surface different from a surface on which the third electrode and the fourth electrode are arranged, and an insulating layer is interposed between the first electrode and the second electrode and the third electrode and the fourth electrode.

[0019] In an embodiment of the present disclosure, the light emitting element may be disposed on the insulating layer, and among a first electrode pair including a first electrode and a second electrode and a second electrode pair including a third electrode and a fourth electrode, the electrode pair disposed on the insulating layer may be electrically connected to the light emitting element.

[0020] In an embodiment of the present disclosure, the third electrode may further include a third protrusion protruding toward the fourth electrode, the fourth electrode may further include a fourth protrusion protruding toward the third electrode, and the third protrusion may face the fourth protrusion, and the light emitting element is interposed between the third protrusion and the fourth protrusion.

[0021] A method for manufacturing a display device according to an embodiment of the present disclosure may include: forming a first electrode, a second electrode, and a third electrode on a substrate, so that the first electrode, the second electrode, and the third electrode each include a main body portion extending in a first direction and are spaced apart from each other in a second direction different from the first direction; providing a light-emitting element on the substrate on which the first electrode to the third electrode are formed; primary alignment of the light-emitting element by applying a first alignment signal to the first electrode and the second electrode; and secondary alignment of the light-emitting element by applying a second alignment signal to the third electrode and the second electrode. The first electrode also includes a first protrusion protruding toward the second electrode, and the second electrode also includes a second protrusion protruding toward the first electrode. When the first alignment signal is applied to the first electrode and the second electrode, the light-emitting element can be aligned so that the first end and the second end of the light-emitting element face the first protrusion and the second protrusion, respectively.

[0022] In an embodiment of the present disclosure, the frequency of the first alignment signal may be higher than the frequency of the second alignment signal.

[0023] In an embodiment of the present disclosure, secondarily aligning the light emitting element may include aligning the light emitting element such that a first end of the light emitting element faces a main portion of one of the first electrode and the second electrode.

[0024] In an embodiment of the present disclosure, the waveform of the second alignment signal may be a square wave, a sawtooth wave, or a pulse wave.

[0025] In an embodiment of the present disclosure, the method of manufacturing a display device may further include: forming a first contact electrode and a second contact electrode, the first contact electrode being configured to electrically connect at least one of the first electrode and the third electrode to the light-emitting element, and the second contact electrode being configured to electrically connect the second electrode to the light-emitting element.

[0026] The method for manufacturing a display device according to an embodiment of the present disclosure may include: forming a first electrode and a second electrode on a substrate, the first electrode and the second electrode each including a main body portion extending in a first direction and being spaced apart from each other in a second direction different from the first direction; forming a third electrode and a fourth electrode on a substrate, the third electrode and the fourth electrode each including a main body portion extending in the first direction, and the third electrode and the fourth electrode facing each other and the first electrode and the second electrode interposed between the third electrode and the fourth electrode; providing a light-emitting element on the substrate on which the first electrode to the fourth electrode are formed; primary alignment of the light-emitting element by applying a first alignment signal to the first electrode and the second electrode; and secondary alignment of the light-emitting element by applying a second alignment signal to the third electrode and the fourth electrode. The first electrode may further include a first protrusion protruding toward the second electrode, and the second electrode may further include a second protrusion protruding toward the first electrode. When the first alignment signal is applied to the first electrode and the second electrode, the light-emitting element is aligned so that the first end and the second end of the light-emitting element face the first protrusion and the second protrusion, respectively.

[0027] Beneficial Effects

[0028] According to the embodiments of the present disclosure, a display device having an excellent degree of directional alignment of a light emitting element and a method of manufacturing the display device can be provided.

[0029] According to an embodiment of the present disclosure, the first electrode and the second electrode respectively include a first protrusion and a second protrusion protruding toward each other, so that the light emitting element can be initially aligned and finally directional aligned. In this way, the degree of directional alignment of the light emitting element can be improved.

[0030] However, the advantageous effects of the present disclosure are not limited to the foregoing advantageous effects, and may be extended in various forms without departing from the spirit and scope of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1a and Figure 1b is a perspective view showing a light emitting element according to an embodiment of the present disclosure.

[0032] Figure 2a and Figure 2b is a circuit diagram showing a unit emission area of ​​a display device according to an embodiment of the present disclosure.

[0033] Figure 3 is a plan view showing a display device according to an embodiment of the present disclosure.

[0034] Figures 4a to 4f is a plan view showing a display element layer according to an embodiment of the present disclosure.

[0035] Figure 5a It is along Figure 4a A cross-sectional view taken along line II' of Figure 5b It is along Figure 4a A cross-sectional view taken along line II-II', Figure 5c It is along Figure 4c A cross-sectional view taken along line II' of Figure 5d It is along Figure 4d A cross-sectional view taken along line II' of Figure 5e It is along Figure 4f A cross-sectional view taken along line II'.

[0036] Figure 6a and Figure 6b is a plan view showing a display element layer according to another embodiment of the present disclosure.

[0037] Figure 7a It is along Figure 6a A cross-sectional view taken along line III-III', and Figure 7b It is along Figure 6b A cross-sectional view taken along line III-III'.

[0038] Figures 8a to 8c is a plan view showing a display element layer according to still another embodiment of the present disclosure.

[0039] Figure 9a It is along Figure 8a A cross-sectional view taken along line IV-IV', and Figure 9b It is along Figure 8c A cross-sectional view taken along line IV-IV'.

[0040] Fig.10a and Fig.10b is a plan view showing a display element layer according to still another embodiment of the present disclosure.

[0041] Fig.11a It is along Fig.10a A cross-sectional view taken along line V-V' of Fig.11b It is along Fig.10b A cross-sectional view taken along line V-V'.

[0042] Fig.12 is a cross-sectional view showing a display device according to an embodiment of the present disclosure.

[0043] Figures 13a to 13e are plan views sequentially illustrating a method of manufacturing a display device according to an embodiment of the present disclosure.

[0044] Fig.14 : is a diagram showing the torques that contribute to the alignment of the light emitting element and their mutual relationship.

[0045] Figures 15a to 15g are plan views sequentially illustrating a method of manufacturing a display device according to another embodiment of the present disclosure. DETAILED DESCRIPTION

[0046] Since the present disclosure allows various changes and multiple embodiments, specific embodiments will be shown in the drawings and described in detail in the written description. However, this is not intended to limit the present disclosure to a specific practice mode, and it will be understood that all changes, equivalents and substitutions that do not depart from the spirit and technical scope of the present disclosure are included in the present disclosure.

[0047] When describing each of the accompanying drawings, similar reference numerals are used to designate similar parts. For the clarity of the present disclosure, the size of the structure in the accompanying drawings may be enlarged. It should be noted that although the terms "first", "second", etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, without departing from the teachings of the present disclosure, the first element may be referred to as the second element, and similarly, the second element may also be referred to as the first element. Singular forms are intended to also include plural forms, unless the context clearly indicates otherwise.

[0048] It should be understood that when used in this specification, the term "comprising" or "having" specifies the presence of stated features, quantities, steps, operations, elements, components and / or combinations thereof, but does not exclude the presence or addition of one or more other features, quantities, steps, operations, elements, components and / or combinations thereof. In addition, when a first part such as a layer, a film, a region or a plate is disposed on a second part, the first part may not only be directly on the second part, but also a third part may be interposed therebetween. In addition, when it is stated that a first part such as a layer, a film, a region or a plate is formed on a second part, the direction of the second part on which the first part is formed is not limited to the upper direction, but may include the case where the first part is formed in a lateral direction or a lower direction. On the contrary, when a first part such as a layer, a film, a region or a plate is below the second part, the first part may not only be directly below the second part, but also a third part may be interposed therebetween.

[0049] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0050] Figure 1a and Figure 1b is a perspective view showing a light emitting element according to an embodiment of the present disclosure. Figure 1a and Figure 1b , although the light emitting element LD having a cylindrical shape is shown, the present disclosure is not limited thereto.

[0051] refer to Figure 1a and Figure 1b The light emitting element LD according to the embodiment of the present disclosure 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 .

[0052] In an example, the light emitting element LD may be implemented as a stacked body in which a first semiconductor layer 11 , an active layer 12 , and a second semiconductor layer 13 are sequentially stacked.

[0053] According to an embodiment of the present disclosure, the light emitting element LD may be provided in the form of a rod extending in one direction. Assuming that the extending direction of the light emitting element LD is a longitudinal direction, the light emitting element LD may have a first end and a second end along the longitudinal direction.

[0054] In an embodiment of the present disclosure, one of the first semiconductor layer 11 and the second semiconductor layer 13 may be disposed on the first end (eg, the first portion), and the remaining one of the first semiconductor layer 11 and the second semiconductor layer 13 may be disposed on the second end (eg, the second portion).

[0055] In an embodiment of the present disclosure, the light emitting element LD may be provided in the form of a rod. However, the term "rod-type" includes a rod-like shape or a bar-like shape having a large longitudinal length (i.e., having an aspect ratio greater than 1), such as a cylindrical shape or a prism shape. For example, the length of the light emitting element LD may be greater than its diameter.

[0056] The light emitting element LD may be manufactured to be small enough to have a diameter and / or a length of, for example, a micrometer-level or nanometer-level level.

[0057] However, the size of the light emitting element LD according to the embodiment of the present disclosure is not limited thereto, and the size of the light emitting element LD may be changed to meet the requirements of the display device to which the light emitting element LD is applied.

[0058] The first semiconductor layer 11 may include, for example, at least one n-type semiconductor layer. For example, the first semiconductor layer 11 may include a semiconductor layer including any one of InAlGaN, GaN, AlGaN, InGaN, AlN, and InN semiconductor materials, and doped with a first conductive dopant such as Si, Ge, or Sn.

[0059] However, the material forming the first semiconductor layer 11 is not limited thereto, and the first semiconductor layer 11 may be formed of various materials other than the described materials.

[0060] The active layer 12 may be formed on the first semiconductor layer 11 and may be formed to have a single quantum well structure or a multi-quantum well structure. In various embodiments of the present disclosure, a cladding layer (not shown) doped with a conductive dopant may be formed on and / or below the active layer 12. For example, the cladding layer may be implemented as an AlGaN layer or an InAlGaN layer. In addition, it is apparent that materials such as AlGaN or AlInGaN may also be used for the active layer 12.

[0061] When an electric field of a predetermined voltage or more is applied to opposite ends of the light emitting element LD, the light emitting element LD emits light when electron-hole pairs are recombined with each other in the active layer 12 .

[0062] The second semiconductor layer 13 may be disposed on the active layer 12, and may include a semiconductor layer of a type different from that of the first semiconductor layer 11. For example, the second semiconductor layer 13 may include at least one p-type semiconductor layer. For example, the second semiconductor layer 13 may include a semiconductor layer including at least one semiconductor material of InAlGaN, GaN, AlGaN, InGaN, AlN, and InN, and doped with a second conductive dopant such as Mg.

[0063] However, the material forming the second semiconductor layer 13 is not limited thereto, and the second semiconductor layer 13 may be formed of various materials other than the described materials.

[0064] According to an embodiment of the present disclosure, in addition to the first semiconductor layer 11, the active layer 12 and the second semiconductor layer 13 described above, the light emitting element LD may further include other phosphor layers, active layers, semiconductor layers and / or electrodes on and / or below each layer.

[0065] In an implementation, the light emitting element LD may further include at least one electrode disposed on one end (eg, top surface) of the second semiconductor layer 13 or one end (eg, bottom surface) of the first semiconductor layer 11 .

[0066] For example, Figure 1b As shown in , the light emitting element LD may further include an electrode 15 disposed on one end of the second semiconductor layer 13. The electrode 15 may be, but is not limited to, an ohmic contact electrode. According to an embodiment, the electrode 15 may be a Schottky contact electrode. In addition, the electrode 15 may include a metal or a metal oxide, and may be, for example, chromium (Cr), titanium (Ti), aluminum (Al), gold (Au), nickel (Ni) and its oxide or alloy or a transparent conductive material such as ITO, alone or in combination, but not limited thereto. In addition, in an embodiment, the electrode 15 may be substantially transparent or translucent. Thus, the light generated from the light emitting element LD may be emitted to the outside of the light emitting element LD after passing through the electrode 15.

[0067] In addition, the light emitting element LD may further include an insulating layer 14. However, according to an embodiment of the present disclosure, the insulating layer 14 may be omitted, and the insulating layer 14 may also be provided to cover only some of the first semiconductor layer 11, the active layer 12, and the second semiconductor layer 13.

[0068] For example, the insulating layer 14 may be provided on a portion of the light emitting element LD except for opposite ends thereof, thereby enabling the opposite ends of the light emitting element LD to be exposed.

[0069] For ease of description, Figure 1a and Figure 1b , a shape in which a part of the insulating layer 14 is removed is depicted, and the entire side surface of the actual light emitting element LD may be surrounded by the insulating layer 14 .

[0070] The insulating layer 14 may be provided to surround at least a portion of the outer circumferential surface of the first semiconductor layer 11, the active layer 12, and / or the second semiconductor layer 13. For example, the insulating layer 14 may be provided to surround at least the outer circumferential surface of the active layer 12. In addition, when the light emitting element LD includes the electrode 15, the insulating layer 14 may also be provided to surround at least a portion of the outer circumferential surface of the electrode 15.

[0071] In an embodiment of the present disclosure, the insulating layer 14 may include a transparent insulating material. For example, the insulating layer 14 may include, but is not limited to, a material selected from SiO 2 、Si 3 N 4 、Al 2 O 3 and TiO 2 One or more insulating materials in the group consisting of, and various materials having insulating properties can be used.

[0072] When the insulating layer 14 is provided on the surface of the light emitting element LD, the active layer 12 may be prevented from being short-circuited with the first electrode and / or the second electrode, not shown.

[0073] In addition, by forming the insulating layer 14, the occurrence of defects on the surface of the light emitting element LD can be minimized, thereby improving the life and efficiency of the light emitting element LD. In addition, when a plurality of light emitting elements LD are arranged in close contact with each other, the insulating layer 14 can prevent an undesirable short circuit from occurring between the light emitting elements LD.

[0074] The light emitting element LD described above can be used as a light source of various display devices. For example, the light emitting element LD can be used as a light source element of a lighting device or a self-emitting display device.

[0075] Figure 2a and Figure 2bis a circuit diagram showing a unit emission area of ​​a display device according to an embodiment of the present disclosure.

[0076] Figure 2a and Figure 2b An example of forming a pixel of an active light emitting display panel is shown. In an embodiment of the present disclosure, the unit emission area may be a pixel area in which one sub-pixel is disposed.

[0077] refer to Figure 2a , the sub-pixel SP may include one or more light emitting elements LD and a pixel driving circuit 144 , wherein the pixel driving circuit 144 is coupled to the light emitting element LD and configured to drive the light emitting element LD.

[0078] A first electrode (eg, an anode electrode) of each light emitting element LD may be coupled to a first driving power source VDD via a pixel driving circuit 144, and a second electrode (eg, a cathode electrode) of the light emitting element LD may be coupled to a second driving power source VSS.

[0079] Here, the first driving power source VDD and the second driving power source VSS may have different potentials. For example, the potential of the second driving power source VSS may be lower than that of the first driving power source VDD by a threshold voltage of the light emitting element LD or more.

[0080] Each of the light emitting elements LD may emit light having brightness corresponding to a driving current controlled by the pixel driving circuit 144 .

[0081] At the same time, despite Figure 2a , an embodiment in which only one light emitting element LD is included in the sub-pixel SP is shown, but the present disclosure is not limited thereto. For example, the sub-pixel SP may include a plurality of light emitting elements LD coupled to each other in parallel.

[0082] According to an embodiment of the present disclosure, the pixel driving circuit 144 may include a first transistor Tr1, a second transistor Tr2, and a storage capacitor Cst. However, the structure of the pixel driving circuit 144 is not limited to Figure 2a The embodiment shown in .

[0083] A first electrode of the first transistor Tr1 (driving transistor) may be coupled to a first driving power source VDD, and a second electrode thereof may be electrically connected to a first electrode of each of the light emitting elements LD. A gate electrode of the first transistor Tr1 is coupled to a first node N1. The first transistor Tr1 controls the amount of driving current supplied to the light emitting element LD in response to a voltage of the first node N1.

[0084] A first electrode of the second transistor Tr2 (switching transistor) is coupled to the data line DL, and a second electrode thereof is coupled to the first node N1. Here, the first electrode and the second electrode of the second transistor Tr2 may be different electrodes, wherein when the first electrode is, for example, a source electrode, the second electrode may be a drain electrode. In addition, a gate electrode of the second transistor Tr2 is coupled to the scan line SL.

[0085] The second transistor Tr2 is turned on when a scan signal having a voltage (e.g., a low voltage) capable of turning on the second transistor Tr2 is supplied from the scan line SL, thereby electrically connecting the data line DL and the first node N1 to each other. In this case, a data signal for a corresponding frame is supplied to the data line DL, and the data signal is transmitted to the first node N1. The data signal transmitted to the first node N1 is charged in the storage capacitor Cst.

[0086] One electrode of the storage capacitor Cst is coupled to the first driving power source VDD, and the other electrode thereof is coupled to the first node N1. The storage capacitor Cst may charge a voltage corresponding to a data signal supplied to the first node N1 and maintain the charged voltage until a data signal for a subsequent frame is supplied.

[0087] For ease of description, Figure 2a , a pixel driving circuit 144 having a relatively simple structure is shown, which includes a second transistor Tr2 for transmitting a data signal to a sub-pixel SP, a storage capacitor Cst for storing the data signal, and a first transistor Tr1 for providing a driving current corresponding to the data signal to the light emitting element LD.

[0088] However, the present disclosure is not limited thereto, and the structure of the pixel driving circuit 144 may be modified and practiced in various forms. For example, it is apparent that the pixel driving circuit 144 may further include at least a transistor element (such as a transistor element for compensating for the threshold voltage of the first transistor Tr1, a transistor element for initializing the first node N1, and / or a transistor element for controlling the emission time of the light emitting element LD) or other circuit elements (such as a boost capacitor for boosting the voltage of the first node N1).

[0089] In addition, although Figure 2a In the embodiment, all transistors (e.g., the first transistor Tr1 and the second transistor Tr2) included in the pixel driving circuit 144 are shown as P-type transistors, but the present disclosure is not limited thereto. That is, at least one of the first transistor Tr1 and the second transistor Tr2 included in the pixel driving circuit 144 may be replaced with an N-type transistor.

[0090] refer to Figure 2bAccording to an embodiment of the present disclosure, the first transistor Tr1 and the second transistor Tr2 may be implemented as N-type transistors. In addition to the change in connection positions of some components due to the change in the type of transistors, Figure 2b The pixel drive circuit 144 shown in FIG. 1 is similar in configuration and operation to Figure 2a Therefore, a detailed description thereof will be omitted.

[0091] Figure 3 1 is a plan view showing a display device according to an embodiment of the present disclosure. Figure 1a or Figure 1b Schematic plan view of a display device in which the light emitting element LD shown in FIG. 1 is used as a light emitting source.

[0092] refer to Figure 1a , Figure 1b and Figure 3 A display device according to an embodiment of the present disclosure may include a substrate SUB, pixels PXL disposed on one surface of the substrate SUB, a driver disposed on the substrate SUB and configured to drive the pixels PXL, and a line circuit (not shown) connecting the pixels PXL to the driver.

[0093] According to a scheme for driving the light emitting element LD, the display device can be divided into a passive matrix type display device and an active matrix type display device. For example, when the display device is implemented as an active matrix type, each of the pixels PXL may include a driving transistor for controlling the amount of current supplied to the light emitting element LD, a switching transistor for transmitting a data signal to the driving transistor, and the like.

[0094] Recently, from the perspective of resolution, contrast and operating speed, active matrix display devices for selecting and turning on each pixel PXL have become mainstream, but the present disclosure is not limited to this, and passive matrix display devices for turning on each group of pixels PXL can also use components for driving the light-emitting element LD (for example, a first electrode and a second electrode, etc.).

[0095] The substrate SUB may include a display area DA and a non-display area NDA. The display area DA may be an area in which pixels PXL for displaying an image are disposed. The non-display area NDA may be an area in which a driver for driving the pixels PXL and a portion of a line circuit for connecting the pixels PXL to the driver are disposed.

[0096] The pixel PXL may be arranged in the display area DA on the substrate SUB. Each of the pixels PXL may be a unit through which an image is displayed, and may be arranged as a plurality of pixels. The pixel PXL may include a light emitting element LD that emits white light and / or colored light. Each pixel PXL may emit light having any one of red, green, and blue, but is not limited thereto. For example, each pixel PXL may emit light having any one of cyan, magenta, yellow, and white.

[0097] The pixels PXL may be provided as a plurality of pixels and may be 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 the pixels PXL may be arranged in various forms.

[0098] The driver may provide a signal to each pixel PXL through a line circuit, and may then control the operation of the pixel PXL. Figure 3 In the figure, for the convenience of description, the line circuit is omitted.

[0099] The driver may include: a scan driver SDV configured to pass a scan line (eg Figure 2a and Figure 2b SL shown in FIG. 1 ) provides a scan signal to each pixel PXL; an emission driver EDV configured to provide an emission control signal to each pixel PXL through an emission control line; a data driver DDV configured to provide an emission control signal to each pixel PXL through a data line (eg Figure 2a and Figure 2b DL shown in FIG. 1 ) provides a data signal to each pixel PXL; and a timing controller (not shown). The timing controller can control the scan driver SDV, the emission driver EDV, and the data driver DDV.

[0100] The display device according to the embodiment of the present disclosure can be used in various electronic devices. For example, the display device can be applied to televisions, notebook computers, cellular phones, smart phones, smart boards (PDs), portable multimedia players (PMPs), personal digital assistants (PDAs), navigation devices, various types of wearable devices such as smart watches, etc.

[0101] Figures 4a to 4f is a plan view showing a display element layer according to an embodiment of the present disclosure. Specifically, Figures 4a to 4f 1 and 2 are plan views showing various embodiments of a display element layer DPL in which first, second and third electrodes EL1, EL2 and EL3 and a light emitting element LD are provided on the same surface of a substrate SUB.

[0102] In addition, in the embodiments of the present disclosure, the expression “formed and / or disposed on the same surface” may mean that components are formed in the same process, and the expression “formed and / or disposed on different surfaces” may mean that components are formed in different processes.

[0103] Despite Figures 4a to 4f , the light emitting elements LD are shown to be aligned in parallel in the second direction DR2, but the arrangement of the light emitting elements LD is not limited thereto. For example, the light emitting elements LD may be aligned between the first electrode EL1 and the second electrode EL2 in a diagonal direction with respect to the second direction DR2.

[0104] Figure 5a It is along Figure 4a A cross-sectional view taken along line II' of Figure 5b It is along Figure 4a A cross-sectional view taken along line II-II', Figure 5c It is along Figure 4c A cross-sectional view taken along line II' of Figure 5d It is along Figure 4d A cross-sectional view taken along line II' of Figure 5e It is along Figure 4f A cross-sectional view taken along line II'.

[0105] like Figures 4a to 5e As shown in , the display element layer DPL according to the embodiment of the present disclosure may include first, second and third electrodes EL1, EL2 and EL3 and a light emitting element LD provided on a substrate SUB.

[0106] The substrate SUB may be a rigid substrate or a flexible substrate.

[0107] The rigid substrate may include a glass substrate, a quartz substrate, a glass ceramic substrate, and a crystalline glass substrate.

[0108] The flexible substrate may include a film substrate and a plastic substrate, each of which includes a polymer organic material. 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), cellulose triacetate (TAC), and cellulose acetate propionate (CAP). In addition, the flexible substrate may include glass fiber reinforced plastic.

[0109] (FRP).

[0110] During the process of manufacturing the display device, it may be desirable that the material applied to the substrate SUB has resistance (heat resistance) to high processing temperatures. In various embodiments of the present disclosure, the substrate SUB may be completely or at least partially flexible.

[0111] The display element layer DPL may include a buffer layer BFL disposed on the substrate SUB. The buffer layer BFL may prevent impurities from diffusing into the light emitting element LD. The buffer layer BFL may be provided in a single-layer structure or in a multi-layer structure having two or more layers. In the case where the buffer layer BFL is provided in a multi-layer structure, the corresponding layers may be formed of the same material or different materials. Meanwhile, the buffer layer BFL may be omitted depending on the material and processing conditions of the substrate SUB.

[0112] In an embodiment of the present disclosure, the first electrode EL1, the second electrode EL2, the third electrode EL3 and the light emitting element LD may be disposed on the same surface of the substrate SUB. For example, the first electrode EL1, the second electrode EL2, the third electrode EL3 and the light emitting element LD may be disposed on one surface of the substrate SUB, or on one surface of a buffer layer BFL disposed on the substrate SUB.

[0113] On the substrate SUB, main portions of the first electrode EL1 and the second electrode EL2 may extend in the first direction DR1 and may be disposed to be spaced apart from each other in the second direction DR2. The third electrode EL3 may be disposed on the substrate SUB to face the second electrode EL2 with the first electrode EL1 interposed therebetween.

[0114] like Figures 4a to 4f As shown in , the first electrode EL1 may include a plurality of first protrusions P1 protruding toward the second electrode EL2 in the second direction DR2, and the plurality of first protrusions P1 may be aligned in the first direction DR1 on a main portion of the first electrode EL1. In addition, the second electrode EL2 may include a plurality of second protrusions P2 protruding toward the first electrode EL1 in the second direction DR2, and the plurality of second protrusions P2 may be aligned in the first direction DR1 on a main portion of the second electrode EL2. Here, the first protrusions P1 and the second protrusions P2 may be alternately arranged in the first direction DR1.

[0115] Since the first protrusion P1 is provided on the main portion of the first electrode EL1 and the second protrusion P2 is provided on the main portion of the second electrode EL2, the degree of directional alignment of the light emitting element LD in the display device can be improved. In detail, after the light emitting element LD has been primarily aligned between the first protrusion P1 and the second protrusion P2, its secondary alignment is performed, and thus the degree of directional alignment of the light emitting element LD can be further improved. This will be described in detail later.

[0116] The first protrusion P1 and the second protrusion P2 may be disposed parallel to each other with respect to the second direction DR2. Since the first protrusion P1 and the second protrusion P2 are disposed parallel to each other, the light emitting element LD may be effectively primary-aligned, which will be described later.

[0117] refer to Figures 4a to 4f , the first electrode EL1, the second electrode EL2, and the third electrode EL3 may be coupled to the connection lines CL1-1, CL2-1, and CL1-2, respectively. For example, the first electrode EL1 may be coupled to the 1-1 connection line CL1-1, the second electrode EL2 may be coupled to the 2-1 connection line CL2-1, and the third electrode EL3 may be coupled to the 1-2 connection line CL1-2. The 1-1 connection line CL1-1 and / or the 1-2 connection line CL1-2 may be coupled to the first driving power source VDD, and the 2-1 connection line CL2-1 may be coupled to the second driving power source VSS. Different from this, the 1-1 connection line CL1-1 and / or the 1-2 connection line CL1-2 may be coupled to the second driving power source VSS, and the 2-1 connection line CL2-1 may be coupled to the first driving power source VDD.

[0118] In an embodiment of the present disclosure, the substrate SUB may include an emission region in which the light emitting element LD is disposed, and a non-emission region in which the light emitting element LD is not disposed. In the non-emission region of the substrate SUB, connection lines CL1-1, CL1-2, and CL2-1 may be disposed, and the display element layer DPL may include an insulating layer INS disposed in the non-emission region. The first electrode EL1, the second electrode EL2, and the third electrode EL3, the 1-1 connection line CL1-1, the 1-2 connection line CL1-2, and the 2-1 connection line CL2-1, and the light emitting element LD may be disposed on the same surface of the substrate SUB.

[0119] like Figures 4a to 4f and Figure 5b As shown in , the insulating layer INS may be disposed on the 2-1st connection line CL2-1, and the bridge pattern BRP may be disposed on the insulating layer INS. The bridge pattern BRP may electrically connect the first electrode EL1 to the 1-1st connection line CL1-1. In another embodiment, the first electrode EL1 may be coupled to the 1-1st connection line CL1-1 across the insulating layer INS without using the bridge pattern BRP.

[0120] In various embodiments of the present disclosure, the light emitting element LD may be disposed between the first protrusion P1 and the second protrusion P2 with respect to the first direction DR1 and between the first electrode EL1 and the second electrode EL2 and between the second electrode EL2 and the third electrode EL3 with respect to the second direction DR2.

[0121] The respective first ends of the light emitting element LD may be aligned toward the main body portion of one of the first electrode EL1 and the second electrode EL2. That is, the light emitting element LD may be directionally aligned on the substrate SUB. For example, the light emitting element LD may be aligned such that the respective first ends of the light emitting element LD face the main body portion of the first electrode EL1, and the respective second ends of the light emitting element LD face the main body portion of the second electrode EL2. Here, the first end of the light emitting element LD may be the anode electrode AE, and the second end of the light emitting element LD may be the cathode electrode CE. Conversely, the first end of the light emitting element LD may be the cathode electrode CE, and the second end of the light emitting element LD may be the anode electrode AE.

[0122] Despite Figures 4a to 4f , a situation is shown in which the first end of the light emitting element LD (e.g., the anode electrode AE) faces the main portion of the first electrode EL1 and the second end (e.g., the cathode electrode CE) faces the main portion of the second electrode EL2, but unlike the situation described above, the first end of the light emitting element LD may face the main portion of the second electrode EL2, and the second end thereof may face the main portion of the first electrode EL1.

[0123] In an embodiment of the present disclosure, the display element layer DPL may include a first contact electrode CNT1 for electrically connecting at least one of the first electrode EL1 and the third electrode EL3 to the light emitting element LD and a second contact electrode CNT2 for electrically connecting the second electrode EL2 to the light emitting element LD. Specifically, the first contact electrode CNT1 may electrically connect at least the first electrode EL1 of the first electrode EL1 and the third electrode EL3 to the light emitting element LD.

[0124] The first contact electrode CNT1 and the second contact electrode CNT2 may include at least one of various transparent conductive materials including ITO, IZO, and ITZO, and may be implemented to be substantially transparent or translucent so as to satisfy a predetermined transmittance. However, the materials of the first contact electrode CNT1 and the second contact electrode CNT2 are not limited to the above-described embodiments, and according to embodiments, the first contact electrode CNT1 and the second contact electrode CNT2 may be formed of various opaque conductive materials.

[0125] The first and second contact electrodes CNT1 and CNT2 may each be formed of a transparent conductive material so that light emitted from each of the light emitting elements LD reaches the second and third electrodes EL3 without loss.

[0126] refer to Figures 4a to 4e The first contact electrode CNT1 may electrically connect the first electrode EL1 to the first end (eg, anode electrode AE) of the light emitting element LD, and the second contact electrode CNT2 may electrically connect the second electrode EL2 to the second end (eg, cathode electrode CE) of the light emitting element LD.

[0127] The first electrode EL1 may be connected to the 1-1th connection line CL1-1, and the 1-1th connection line CL1-1 may be connected to the first driving power source VDD. That is, the first electrode EL1 may be electrically connected to the first driving power source VDD via the 1-1th connection line CL1-1. The first contact electrode CNT1 electrically connected to the first electrode EL1 may apply a voltage (e.g., an alternating current (AC) voltage) of the first driving power source VDD to the first end of the light emitting element LD.

[0128] The second electrode EL2 may be connected to the 2-1st connection line CL2-1, and the 2-1st connection line CL2-1 may be connected to the second driving power source VSS. That is, the second electrode EL2 may be electrically connected to the second driving power source VSS via the 2-1st connection line CL2-1. The second contact electrode CNT2 electrically connected to the second electrode EL2 may apply a voltage (e.g., a ground (GND) voltage) of the second driving power source VSS to the second end of the light emitting element LD.

[0129] As described above, when an electric field of a predetermined voltage or more is applied to both ends of the light emitting element LD, the light emitting element LD emits light when electrons and holes recombine with each other to generate electron-hole pairs in the active layer 12 of the light emitting element LD.

[0130] refer to Figure 4f The first contact electrode CNT1 may electrically connect the first electrode EL1 and the third electrode EL3 to a first end (eg, anode electrode AE) of the light emitting element LD, and the second contact electrode CNT2 may electrically connect the second electrode EL2 to a second end (eg, cathode electrode CE) of the light emitting element LD.

[0131] In an embodiment of the present disclosure, one of the 1-1 connection line CL1-1 and the 1-2 connection line CL1-2 may be coupled to the first driving power source VDD. For example, when the 1-1 connection line CL1-1 is coupled to the first driving power source VDD, the first contact electrode CNT1 may provide the first end of the light emitting element LD with a driving voltage of the first driving power source VDD transmitted through the first electrode EL1. Conversely, when the 1-2 connection line CL1-2 is coupled to the first driving power source VDD, the first contact electrode CNT1 may provide the first end of the light emitting element LD with a driving voltage of the first driving power source VDD transmitted through the third electrode EL3.

[0132] In various embodiments of the present disclosure, the display element layer DPL may include banks BNK1 and BNK2 spaced apart from each other with the light emitting element LD interposed therebetween.

[0133] like Figures 4a to 5e As shown in FIG. 1 , the banks BNK1 and BNK2 may be disposed on the substrate SUB in a form in which they extend in the first direction DR1 and are spaced apart from each other in the second direction DR2 , and may separate the unit emission regions.

[0134] Two banks BNK1 and BNK2 adjacent to each other on the substrate SUB may be spaced apart from each other by a predetermined interval in the second direction DR2. For example, the first and second banks BNK1 and BNK2 adjacent to each other may be spaced apart from each other by the length of the light emitting element LD or more on the substrate SUB.

[0135] Each of the first bank BNK1 and the second bank BNK2 may include an inorganic insulating layer formed of an inorganic material or an organic insulating layer formed of an organic material. In an embodiment, each of the first bank BNK1 and the second bank BNK2 may include, but is not limited to, an organic insulating layer having a single-layer structure and / or an inorganic insulating layer having a single-layer structure. In an embodiment, each of the first bank BNK1 and the second bank BNK2 may be provided in a multilayer form in which one or more organic insulating layers and one or more inorganic insulating layers are stacked. However, the materials of the first bank BNK1 and the second bank BNK2 are not limited to the embodiments described above, and according to an embodiment, the first bank BNK1 and the second bank BNK2 may include a conductive material.

[0136] The banks BNK1 and BNK2 may have, but are not limited to, a trapezoidal cross section whose width decreases upward in the third direction DR3. In another example, the banks BNK1 and BNK2 may include a curved surface having a semicircular or semi-elliptical cross section whose width decreases upward. In the present disclosure, the shape and / or gradient of the banks BNK1 and BNK2 are not particularly limited and may be changed in various forms.

[0137] refer to Figures 4a to 5e , the second electrode EL2 and the third electrode EL3 may be disposed on the first bank BNK1 and the second bank BNK2. The second electrode EL2 and the third electrode EL3 may be disposed to correspond to the shapes of the first bank BNK1 and the second bank BNK2. That is, the second electrode EL2 and the third electrode EL3 may have a shape corresponding to the gradient of the first bank BNK1 and the second bank BNK2. For example, each of the second electrode EL2 and the third electrode EL3 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.

[0138] In an embodiment of the present disclosure, the second electrode EL2 and the third electrode EL3 may be reflective electrodes. The second electrode EL2 and the third electrode EL3 as reflective electrodes may guide light emitted from the light emitting element LD in a direction (eg, a forward direction) from the substrate SUB to the display element layer DPL.

[0139] Each of the first bank BNK1 and the second bank BNK2 and the second electrode EL2 and the third electrode EL3 can function as a reflective element that guides light emitted from each light emitting element LD to a desired direction and then improves the optical efficiency of the display device. That is, each of the first bank BNK1 and the second bank BNK2 and the second electrode EL2 and the third electrode EL3 can function as a reflective element that enables light emitted from each light emitting element LD to travel in a forward direction (e.g., an image display direction) of the display device, thereby improving the light emitting efficiency of the light emitting element LD.

[0140] The second electrode EL2 and the third electrode EL3 as reflective electrodes may include a conductive material with high light reflectivity. For example, the conductive material with high light reflectivity may include metals such as Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr and Ti and their alloys. According to an embodiment, each of the second electrode EL2 and the third electrode EL3 may include a transparent conductive material. The transparent conductive material may include a conductive oxide (such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO) or indium tin zinc oxide (ITZO)), a conductive polymer (such as PEDOT), etc. When each of the second electrode EL2 and the third electrode EL3 includes a transparent conductive material, a separate conductive layer made of an opaque metal may be further added to reflect the light emitted from each light emitting element LD in the forward direction (image display direction) of the display device. However, the corresponding materials of the second electrode EL2 and the third electrode EL3 are not limited to the materials described above.

[0141] The first electrode EL1 may include a transparent conductive material, such as ITO, IZO, ZNO, ITZO, etc., but the material for forming the first electrode EL1 is not limited thereto.

[0142] refer to Figure 4a , Figure 4b , Figure 4e and Figure 4f , the second electrode EL2 and the third electrode EL3 may be disposed on portions of the first bank BNK1 and the second bank BNK2. For example, the third electrode EL3 may be disposed in a region adjacent to the first electrode EL1 in the region of the first bank BNK1 and the second bank BNK2, and the second electrode EL2 may be disposed in a region opposite to the region. That is, the second electrode EL2 may be disposed on one side of each of the first bank BNK1 and the second bank BNK2 in the second direction DR2, and the third electrode EL3 may be disposed on the other side thereof.

[0143] In various embodiments of the present disclosure, the display element layer DPL may include a bank pattern (not shown).

[0144] The levee pattern may surround at least one side of the peripheral area of ​​each pixel PXL. The levee pattern may be a structure that defines (or separates) the sub-emission area of ​​each pixel PXL and the pixel PXL adjacent thereto, and may be, for example, a pixel defining layer. The levee pattern may be configured to include at least one light blocking material and / or reflective material, thereby preventing a light leakage defect that indicates that light leaks between each pixel PXL and the pixel PXL adjacent thereto. According to an embodiment, in order to further improve the efficiency of light emitted from each pixel PXL, a reflective material layer may be formed on the levee pattern. The levee pattern may be formed and / or disposed on a layer different from that of the levees BNK1 and BNK2, but the present disclosure is not limited thereto, and according to an embodiment, the levee pattern may be formed and / or disposed on the same layer as the levees BNK1 and BNK2.

[0145] In various embodiments of the present disclosure, each first protrusion P1 may include a first end T1 adjacent to the main portion of the second electrode EL2 and a second end T2 adjacent to the main portion of the first electrode EL1, and each second protrusion P2 may include a first end T1' adjacent to the main portion of the first electrode EL1 and a second end T2' adjacent to the main portion of the second electrode EL2.

[0146] like Figure 4bAs shown in , the widths of the first ends T1 and T1' of the first protrusion P1 and the second protrusion P2 in the first direction DR1 may be greater than the widths of the second ends T2 and T2' in the first direction DR1. The widths of the first ends T1 and T1' of the first protrusion P1 and the second protrusion P2 in the first direction DR1 may be formed to be greater than the widths of the second ends T2 and T2' in the first direction DR1, and thus the primary alignment of the light emitting element LD may be effectively performed, which will be described later.

[0147] Despite Figure 4b 2 shows the case where the first ends T1 and T1 ′ of the first protrusion P1 and the second protrusion P2 have a rectangular shape, but the shapes of the first ends T1 and T1 ′ are not limited and may be, for example, an elliptical, trapezoidal, and semicircular shape.

[0148] refer to Figure 4c and Figure 5c , the first bank BNK1 may include a 1-1th bank BNK1-1 and a 1-2th bank BNK1-2, wherein the 1-1th bank BNK1-1 and the 1-2th bank BNK1-2 may be disposed to be spaced apart from each other with the second bank BNK2 interposed therebetween. Figure 4c and Figure 5c , the first electrode EL1 may include a 1-1 electrode EL1-1 and a 1-2 electrode EL1-2 spaced apart from each other, and the third electrode EL3 may include a 3-1 electrode EL3-1 and a 3-2 electrode EL3-2 spaced apart from each other. The second electrode EL2 may be disposed on the entire portion of the second bank BNK2, the 3-1 electrode EL3-1 may be disposed on a portion of the 1-1 bank BNK1-1, and the 3-2 electrode EL3-2 may be disposed on a portion of the 1-2 bank BNK1-2. The 1-1 electrode EL1-1 may be disposed between the 3-1 electrode EL3-1 and the second electrode EL2, and the 1-2 electrode EL1-2 may be disposed between the second electrode EL2 and the 3-2 electrode EL3-2.

[0149] A first end (e.g., anode electrode AE) of the light emitting element LD disposed between the 1-1 electrode EL1-1 and the second electrode EL2 may face the main body portion of the 1-1 electrode EL1-1, and a second end (e.g., cathode electrode CE) thereof may face the main body portion of the second electrode EL2. A first end (e.g., anode electrode AE) of the light emitting element LD disposed between the 1-2 electrode EL1-2 and the second electrode EL2 may face the main body portion of the 1-2 electrode EL1-2, and a second end (e.g., cathode electrode CE) thereof may face the main body portion of the second electrode EL2.

[0150] The first contact electrode CNT1 may include a 1-1th contact electrode CNT1-1 and a 1-2th contact electrode CNT1-2, and the second contact electrode CNT2 may include a 2-1th contact electrode CNT2-1 and a 2-2th contact electrode CNT2-2. The 1-1th contact electrode CNT1-1 may electrically connect the 1-1th electrode EL1-1 to the first end of the light emitting element LD, and the 2-1st contact electrode CNT2-1 may electrically connect the second electrode EL2 to the second end of the light emitting element LD. The 1-2th contact electrode CNT1-2 may electrically connect the 1-2th electrode EL1-2 to the first end of the light emitting element LD, and the 2-2nd contact electrode CNT2-2 may electrically connect the second electrode EL2 to the second end of the light emitting element LD.

[0151] like Figure 4c and Figure 5c As shown in , when the second electrode EL2 is disposed on the entire surface of the second bank BNK2 and the width of the second electrode EL2 in the second direction DR2 increases, a drop in a driving voltage applied through the 2-1st connecting wire CL2-1 can be minimized, and then the driving voltage can be provided to the 2-1st contact electrode CNT2-1 and the 2-2nd contact electrode CNT2-2.

[0152] refer to Figure 4d and Figure 5d , the 1-1st bank BNK1-1 and the 1-2nd bank BNK1-2 may be disposed to be spaced apart from each other with the second bank BNK2 interposed therebetween. Figure 4d and Figure 5d , the second electrode EL2 may include a 2-1st electrode EL2-1 and a 2-2nd electrode EL2-2. The 2-1st electrode EL2-1 and the 2-2nd electrode EL2-2 may be disposed on portions on both sides of the second bank BNK2, the 3-1st electrode EL3-1 may be disposed on a portion of the 1-1st bank BNK1-1, and the 3-2nd electrode EL3-2 may be disposed on a portion of the 1-2nd bank BNK1-2. The 1-1st electrode EL1-1 may be disposed between the 3-1st electrode EL3-1 and the 2-1st electrode EL2-1, and the 1-2nd electrode EL1-2 may be disposed between the 2-2nd electrode EL2-2 and the 3-2nd electrode EL3-2.

[0153] A first end (e.g., anode electrode AE) of the light emitting element LD disposed between the 1-1 electrode EL1-1 and the 2-1 electrode EL2-1 may face the main body portion of the 1-1 electrode EL1-1, and a second end (e.g., cathode electrode CE) thereof may face the main body portion of the 2-1 electrode EL2-1. A first end (e.g., anode electrode AE) of the light emitting element LD disposed between the 1-2 electrode EL1-2 and the 2-2 electrode EL2-2 may face the main body portion of the 1-2 electrode EL1-2, and a second end (e.g., cathode electrode CE) thereof may face the main body portion of the 2-2 electrode EL2-2.

[0154] The 1-1st contact electrode CNT1-1 may electrically connect the 1-1st electrode EL1-1 to the first end of the light emitting element LD, and the 2-1st contact electrode CNT2-1 may electrically connect the 2-1st electrode EL2-1 to the second end of the light emitting element LD. The 1-2nd contact electrode CNT1-2 may electrically connect the 1-2nd electrode EL1-2 to the first end of the light emitting element LD, and the 2-2nd contact electrode CNT2-2 may electrically connect the 2-2nd electrode EL2-2 to the second end of the light emitting element LD.

[0155] In various embodiments of the present disclosure, reference Figure 4e The first contact electrode CNT1 may include a plurality of first sub-contact electrodes SCNT1 coupled to a portion of the first electrode EL1 adjacent to the light emitting element LD and spaced apart from each other in the first direction DR1. The second contact electrode CNT2 may include a plurality of second sub-contact electrodes SCNT2 coupled to a portion of the second electrode EL2 adjacent to the light emitting element LD and spaced apart from each other in the first direction DR1.

[0156] like Figure 4e As shown in , the first sub-contact electrode SCNT1 may be coupled only to a portion of the first electrode EL1 adjacent to the first end (e.g., the anode electrode AE) of the light emitting element LD, and may be arranged to be spaced apart from each other in the first direction DR1. The second sub-contact electrode SCNT2 may be coupled only to a portion of the second electrode EL2 adjacent to the second end (e.g., the cathode electrode CE) of the light emitting element LD, and may be arranged to be spaced apart from each other in the first direction DR1.

[0157] The first sub-contact electrode SCNT1 is formed in a shape coupled only to a specific portion of the first electrode EL1, and the second sub-contact electrode SCNT2 is formed in a shape coupled only to a specific portion of the second electrode EL2, thereby enabling efficient transmission of a driving voltage to the light emitting element LD.

[0158] In various embodiments of the present disclosure, the display element layer DPL may include an encapsulation layer INC, which is disposed on a surface of the substrate SUB on which the first electrode EL1, the second electrode EL2 and the third electrode EL3, the first contact electrode CNT1 and the second contact electrode CNT2, and the light emitting element LD are disposed. The encapsulation layer INC may cover the first electrode EL1, the second electrode EL2 and the third electrode EL3, the first contact electrode CNT1 and the second contact electrode CNT2, and the light emitting element LD so that they are not exposed to the outside, thereby preventing the occurrence of corrosion. The encapsulation layer INC 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 encapsulation layer INC may be formed of a transparent insulating material so as to minimize the loss of light emitted from the light emitting element LD and reflected by the second electrode EL2 and the third electrode EL3 in the image display direction of the display device.

[0159] In various embodiments of the present disclosure, an overcoat layer OC may be provided on the encapsulation layer INC (see Fig.12 ). Outer coating OC (see Fig.12 ) may be an encapsulation layer for preventing oxygen and moisture from penetrating the light emitting element LD.

[0160] Figure 6a and Figure 6b is a plan view showing a display element layer according to another embodiment of the present disclosure. Specifically, Figure 6a and Figure 6b 1 is a plan view showing an embodiment of the display element layer DPL in which the first electrode EL1 and the second electrode EL2 are provided on different surfaces from the third electrode EL3 on the substrate SUB.

[0161] Figure 7a It is along Figure 6a A cross-sectional view taken along line III-III', and Figure 7b It is along Figure 6b A cross-sectional view taken along line III-III'.

[0162] In the display device according to the present embodiment, description will be made based on components not described in the display device according to the above-described embodiment to avoid repeated description thereof. Components not particularly described in the present embodiment are consistent with those of the foregoing embodiment, wherein the same reference numerals designate the same components, and similar reference numerals designate similar components. The same applies to the embodiment to be described later.

[0163] like Figures 6a to 7bAs shown in , the display element layer DPL according to an embodiment of the present disclosure may include a first electrode EL1, a second electrode EL2, and a third electrode EL3, an insulating layer INS, and a light emitting element LD disposed on a substrate SUB. In detail, the insulating layer INS may be disposed on one surface of the substrate SUB on which the first electrode EL1 and the second electrode EL2 are disposed, and the third electrode EL3 and the light emitting element LD may be disposed on the insulating layer INS.

[0164] The first electrode EL1 may include a first protrusion P1 protruding toward the second electrode EL2 , and the second electrode EL2 may include a second protrusion P2 protruding toward the first electrode EL1 , wherein the first protrusion P1 and the second protrusion P2 may be alternately arranged in the first direction DR1 .

[0165] The insulating layer INS may overlap with the emission region in which the light emitting element LD is arranged. In addition, a portion of the insulating layer INS may overlap with the non-emission region (e.g., the region in which the 2-1st connection line CL2-1 is arranged). The insulating layer INS may include an insulating material corresponding to any one of an inorganic insulating material and an organic insulating material.

[0166] refer to Figure 6a and Figure 7a , the first bank BNK1 and the second bank BNK2, the first electrode EL1 and the second electrode EL2, and the 1-1 connection line CL1-1, the 1-2 connection line CL1-2, and the 2-1 connection line CL2-1 may be disposed on the same surface on the substrate SUB. The second electrode EL2 may be disposed on portions of the first bank BNK1 and the second bank BNK2. That is, the second electrode EL2 may be disposed to correspond to the shapes of the first bank BNK1 and the second bank BNK2. The first electrode EL1 may be coupled to the 1-2 connection line CL1-2, and the second electrode EL2 may be coupled to the 2-1 connection line CL2-1.

[0167] refer to Figure 6a and Figure 7a , the insulating layer INS may be disposed on one surface of the substrate SUB on which the first bank BNK1 and the second bank BNK2, the first electrode EL1 and the second electrode EL2, and the 1-1 connection line CL1-1, the 1-2 connection line CL1-2, and the 2-1 connection line CL2-1 are disposed. The third electrode EL3 and the light emitting element LD may be disposed on one surface of the insulating layer INS. The third electrode EL3 may be disposed to overlap with a portion of the first bank BNK1 and the second bank BNK2. That is, the third electrode EL3 may be disposed to correspond to the shape of the first bank BNK1 and the second bank BNK2.

[0168] The insulating layer INS may not be disposed on the 1-1th connection line CL1-1, and the third electrode EL3 may be coupled to the 1-1th connection line CL1-1. Unlike this, when the insulating layer INS is disposed on the 1-1th connection line CL1-1, the third electrode EL3 may be coupled to the 1-1th connection line CL1-1 through a contact hole passing through the insulating layer INS.

[0169] In various embodiments of the present disclosure, the third electrode EL3 may include a plurality of third protrusions P3 protruding toward the second electrode EL2. The plurality of third protrusions P3 may be arranged to be spaced apart from each other in the first direction DR1. The third protrusions P3 are disposed on a main portion of the third electrode EL3 so that a first end of the light emitting element LD (e.g., anode electrode AE) may be more easily aligned to face a main portion of the first electrode EL1.

[0170] The light emitting element LD may be disposed between the first protrusion P1 and the second protrusion P2 with respect to the first direction DR1 , and may be disposed between the third protrusion P3 and the second electrode EL2 with respect to the second direction DR2 .

[0171] In various embodiments of the present disclosure, the display element layer DPL may include a first contact electrode CNT1 for electrically connecting the light emitting element LD to the third protrusion P3 , and a second contact electrode CNT2 for electrically connecting the light emitting element LD to the second electrode EL2 .

[0172] Despite Figures 6a to 7b , an embodiment in which the first contact electrode CNT1 includes a plurality of first sub-contact electrodes SCNT1 and the second contact electrode CNT2 includes a plurality of second sub-contact electrodes SCNT2 is shown, but the first contact electrode CNT1 and the second contact electrode CNT2 may be as follows. Figure 4a In the present embodiment, description will be made based on an embodiment in which the first contact electrode CNT1 includes the first sub-contact electrode SCNT1 and the second contact electrode CNT2 includes the second sub-contact electrode SCNT2.

[0173] like Figure 6a and Figure 7a As shown in , the first sub-contact electrode SCNT1 can electrically connect the first end (e.g., the anode electrode AE) of the light emitting element LD to the third protrusion P3 of the third electrode EL3. The first sub-contact electrode SCNT1 is connected to the third protrusion P3, and thus the length of the first sub-contact electrode SCNT1 in the second direction DR2 can be reduced. In this way, the driving voltage transmitted through the third electrode EL3 can be effectively provided to the first end of the light emitting element LD.

[0174] The second sub-contact electrode SCNT2 may electrically connect the second end (eg, cathode electrode CE) of the light emitting element LD to the second electrode EL2. Here, the second sub-contact electrode SCNT2 may be connected to the second electrode EL2 through a contact hole (not shown) passing through the insulating layer INS.

[0175] In an embodiment of the present disclosure, the 1-1 connection line CL1-1 may be coupled to the first driving power source VDD, and the first sub-contact electrode SCNT1 may provide a driving voltage of the first driving power source VDD transmitted through the third electrode EL3 to the first end of the light emitting element LD. The 2-1 connection line CL2-1 may be coupled to the second driving power source VSS, and the second sub-contact electrode SCNT2 may provide a driving voltage of the second driving power source VSS transmitted through the second electrode EL2 to the second end of the light emitting element LD.

[0176] The second electrode EL2 and the third electrode EL3 may be reflective electrodes and may be configured to reflect light emitted from both ends of the light emitting element LD and guide the light in an upward direction (eg, a forward direction) from the third direction DR3 .

[0177] refer to Figure 6b and Figure 7b , the 2-1st electrode EL2-1 and the 2-2nd electrode EL2-2 may be disposed on a portion of the second bank BNK2. The 2-1st electrode EL2-1 and the 2-2nd electrode EL2-2 may be coupled to the 2-1st connection line CL2-1. In the second direction DR2, the 3-1st electrode EL3-1 and the 2-1st electrode EL2-1 may face each other with the 1-1st electrode EL1-1 interposed therebetween, and the 3-2nd electrode EL3-2 and the 2-2nd electrode EL2-2 may face each other with the 1-2nd electrode EL1-2 interposed therebetween.

[0178] like Figure 6b and Figure 7bAs shown in , the first sub-contact electrode SCNT1 may include the 1-1st sub-contact electrode SCNT1-1 and the 1-2nd sub-contact electrode SCNT1-2 spaced apart from each other, and the second sub-contact electrode SCNT2 may include the 2-1st sub-contact electrode SCNT2-1 and the 2-2nd sub-contact electrode SCNT2-2 spaced apart from each other. The first end (e.g., anode electrode AE) of the light emitting element LD disposed between the 1-1st electrode EL1-1 and the 2-1st electrode EL2-1 may be electrically connected to the third protrusion P3 of the 3-1st electrode EL3-1 through the 1-1st sub-contact electrode SCNT1-1. In addition, the second end (e.g., cathode electrode CE) of the light emitting element LD may be electrically connected to the 2-1st electrode EL2-1 through the 2-1st sub-contact electrode SCNT2-1. Here, the 2-1st sub-contact electrode SCNT2-1 may be connected to the 2-1st electrode EL2-1 through a contact hole passing through the insulating layer INS.

[0179] The first end (e.g., anode electrode AE) of the light emitting element LD disposed between the 1-2 electrode EL1-2 and the 2-2 electrode EL2-2 may be electrically connected to the third protrusion P3 of the 3-2 electrode EL3-2 through the 1-2 sub-contact electrode SCNT1-2. In addition, the second end (e.g., cathode electrode CE) of the light emitting element LD may be electrically connected to the 2-2 electrode EL2-2 through the 2-2 sub-contact electrode SCNT2-2. Here, the 2-2 sub-contact electrode SCNT2-2 may be connected to the 2-2 electrode EL2-2 through a contact hole passing through the insulating layer INS.

[0180] Figures 8a to 8c is a plan view showing a display element layer according to another embodiment of the present disclosure. Specifically, Figures 8a to 8c 1 and 2 are plan views showing various embodiments of the display element layer DPL in which the first to fourth electrodes EL1 to EL4 and the light emitting element LD are provided on the same surface of the substrate SUB.

[0181] Figure 9a It is along Figure 8a A cross-sectional view taken along line IV-IV', and Figure 9b It is along Figure 8c A cross-sectional view taken along line IV-IV'.

[0182] like Figures 8a to 9b As shown in , the display element layer DPL according to the embodiment of the present disclosure may include first to fourth electrodes EL1 to EL4 and a light emitting element LD disposed on a substrate SUB. Specifically, the first to fourth electrodes EL1 to EL4 and the light emitting element LD may be disposed on one surface of the substrate SUB, or on one surface of a buffer layer BFL disposed on the substrate SUB.

[0183] In an embodiment of the present disclosure, the display element layer DPL may include a fourth electrode EL4 including a main body portion extending in the first direction DR1 and facing the first electrode EL1 with the second electrode EL2 interposed therebetween. The display element layer DPL may include a first electrode pair ELP1 and a second electrode pair ELP2, the first electrode pair ELP1 including the first electrode EL1 and the second electrode EL2, the second electrode pair ELP2 including the third electrode EL3 and the fourth electrode EL4, wherein the third electrode EL3 and the fourth electrode EL4 face each other with the first electrode pair ELP1 interposed therebetween.

[0184] The first electrode EL1 and the second electrode EL2 may be disposed between the first bank BNK1 and the second bank BNK2. The first electrode EL1 may include a first protrusion P1 protruding toward the second electrode EL2, and the second electrode EL2 may include a second protrusion P2 protruding toward the first electrode EL1, wherein the first protrusion P1 and the second protrusion P2 may be alternately arranged in the first direction DR1.

[0185] like Figures 8a to 8c As shown in , each first protrusion P1 may include a first end T1 and a second end T2, and each second protrusion P2 may include a first end T1' and a second end T2'. The width of the first ends T1 and T1' of the first protrusion P1 and the second protrusion P2 in the first direction DR1 may be greater than the width of the second ends T2 and T2' in the first direction DR1.

[0186] The third electrode EL3 and the fourth electrode EL4 may be disposed on portions of the first bank BNK1 and the second bank BNK2. For example, the third electrode EL3 may be disposed on portions of the first bank BNK1 and the second bank BNK2 adjacent to the first electrode EL1, and the fourth electrode EL4 may be disposed on portions of the first bank BNK1 and the second bank BNK2 adjacent to the second electrode EL2.

[0187] like Figures 8a to 9b As shown in FIG. 1 , the first to fourth electrodes EL1 to EL4, the 1-1th connecting wire CL1-1 to the 2-2th connecting wire CL2-2, and the light emitting element LD may be disposed on one surface of the substrate SUB. The first electrode EL1 may be coupled to the 2-1th connecting wire CL2-1, and the second electrode EL2 may be coupled to the 1-1th connecting wire CL1-1. The third electrode EL3 may be coupled to the 1-2th connecting wire CL1-2, and the fourth electrode EL4 may be coupled to the 2-2th connecting wire CL2-2.

[0188] The display element layer DPL may include an insulating layer INS disposed in the non-emission region. For example, the insulating layer INS may be disposed on the 2-1st connection line CL2-1 and the 1-2nd connection line CL1-2, and the bridge pattern BRP may be disposed on the insulating layer INS. Through the bridge pattern BRP, the second electrode EL2 may be coupled to the 1-1st connection line CL1-1, and the fourth electrode EL4 may be coupled to the 2-2nd connection line CL2-2.

[0189] The light emitting element LD may be disposed between the first protrusion P1 and the second protrusion P2 in the first direction DR1, and may be disposed between the first electrode EL1 and the second electrode EL2 in the second direction DR2. A first end (e.g., anode electrode AE) of the light emitting element LD may face a main portion of the first electrode EL1, and a second end (e.g., cathode electrode CE) thereof may face a main portion of the second electrode EL2. That is, the light emitting element LD may be directionally aligned on the substrate SUB.

[0190] In an embodiment of the present disclosure, the display element layer DPL may include a first contact electrode CNT1 for electrically connecting at least one of the first electrode EL1 and the third electrode EL3 to the light emitting element LD. In detail, the first contact electrode CNT1 may electrically connect at least the first electrode EL1 of the first electrode EL1 and the third electrode EL3 to the light emitting element LD. In addition, the display element layer DPL may include a second contact electrode CNT2 for electrically connecting at least one of the second electrode EL2 and the fourth electrode EL4 to the light emitting element LD. In detail, the second contact electrode CNT2 may electrically connect at least the second electrode EL2 of the second electrode EL2 and the fourth electrode EL4 to the light emitting element LD.

[0191] like Figure 8a and Figure 9a As shown in , the first contact electrode CNT1 may connect the first electrode EL1 to the first end (eg, anode electrode AE) of the light emitting element LD, and the second contact electrode CNT2 may connect the second electrode EL2 to the second end (eg, cathode electrode CE) of the light emitting element LD.

[0192] The 2-1 connection line CL2-1 connected to the first electrode EL1 may be coupled to the first driving power source VDD, and the 1-1 connection line CL1-1 connected to the second electrode EL2 may be coupled to the second driving power source VSS. The first contact electrode CNT1 may provide a driving voltage of the first driving power source VDD to a first end of the light emitting element LD, and the second contact electrode CNT2 may provide a driving voltage of the second driving power source VSS to a second end of the light emitting element LD.

[0193] The third electrode EL3 and the fourth electrode EL4 disposed on the first bank BNK1 and the second bank BNK2 may be reflective electrodes. The third electrode EL3 and the fourth electrode EL4 as reflective electrodes may guide light emitted from the light emitting element LD in a direction (eg, a forward direction) from the substrate SUB to the display element layer DPL.

[0194] The third electrode EL3 and the fourth electrode EL4 as the reflective electrodes may include a conductive material having a high light reflectivity. For example, the third electrode EL3 and the fourth electrode EL4 may each be formed as a single-layer structure formed of Ag, or as a three-layer structure including ITO / Ag / ITO, but the material used to form the third electrode EL3 and the fourth electrode EL4 is not limited thereto.

[0195] The first electrode EL1 and the second electrode EL2 may each include a transparent conductive material. The transparent conductive material may include, for example, ITO, IZO, ITZO, etc., but the material used to form the first electrode EL1 and the second electrode EL2 is not limited thereto.

[0196] like Figure 8b As shown in , the first contact electrode CNT1 may include a plurality of first sub-contact electrodes SCNT1 coupled to a portion of the first electrode EL1 adjacent to the light emitting element LD and spaced apart from each other in the first direction DR1. The second contact electrode CNT2 may include a plurality of second sub-contact electrodes SCNT2 coupled to a portion of the second electrode EL2 adjacent to the light emitting element LD and spaced apart from each other in the first direction DR1.

[0197] At the same time, if Figure 8b As shown in , the first sub-contact electrode SCNT1 may couple the first electrode EL1 to the first end of the light emitting element LD, and the second sub-contact electrode SCNT2 may couple the second electrode EL2 to the second end of the light emitting element LD.

[0198] like Figure 8c and Figure 9b As shown in the figure, the first contact electrode CNT1 can electrically connect the first electrode EL1 and the third electrode EL3 to the first end of the light emitting element LD (e.g., the anode electrode AE), and the second contact electrode CNT2 can electrically connect the second electrode EL2 and the fourth electrode EL4 to the second end of the light emitting element LD (e.g., the cathode electrode CE).

[0199] In an embodiment of the present disclosure, one of the 2-1st connection line CL2-1 and the 1-2nd connection line CL1-2 may be coupled to the first driving power source VDD. One of the 1-1st connection line CL1-1 and the 2-2nd connection line CL2-2 may be coupled to the second driving power source VSS.

[0200] For example, the 2-1st connection line CL2-1 may be coupled to the first driving power source VDD, and the 1-1st connection line CL1-1 may be coupled to the second driving power source VSS. The first contact electrode CNT1 may provide a driving voltage of the first driving power source VDD transmitted through the first electrode EL1 to the first end of the light emitting element LD, and the second contact electrode CNT2 may provide a driving voltage of the second driving power source VSS transmitted through the second electrode EL2 to the second end of the light emitting element LD.

[0201] In addition, the 2-1st connection line CL2-1 may be coupled to the first driving power source VDD, and the 2-2nd connection line CL2-2 may be coupled to the second driving power source VSS. The first contact electrode CNT1 may provide a driving voltage of the first driving power source VDD transmitted through the first electrode EL1 to the first end of the light emitting element LD, and the second contact electrode CNT2 may provide a driving voltage of the second driving power source VSS transmitted through the fourth electrode EL4 to the second end of the light emitting element LD.

[0202] In addition, the 1-2 connection line CL1-2 may be coupled to the first driving power source VDD, and the 1-1 connection line CL1-1 may be coupled to the second driving power source VSS. The first contact electrode CNT1 may provide a driving voltage of the first driving power source VDD transmitted through the third electrode EL3 to the first end of the light emitting element LD, and the second contact electrode CNT2 may provide a driving voltage of the second driving power source VSS transmitted through the second electrode EL2 to the second end of the light emitting element LD.

[0203] In addition, the 1-2 connection line CL1-2 may be coupled to the first driving power source VDD, and the 2-2 connection line CL2-2 may be coupled to the second driving power source VSS. The first contact electrode CNT1 may provide a driving voltage of the first driving power source VDD transmitted through the third electrode EL3 to the first end of the light emitting element LD, and the second contact electrode CNT2 may provide a driving voltage of the second driving power source VSS transmitted through the fourth electrode EL4 to the second end of the light emitting element LD.

[0204] Fig.10a and Fig.10b is a plan view showing a display element layer according to yet another embodiment of the present disclosure. Specifically, Fig.10a and Fig.10b 1 is a plan view showing an embodiment of a display element layer DPL in which first and second electrodes EL1 and EL2 and third and fourth electrodes EL3 and EL4 are provided on different surfaces on a substrate SUB.

[0205] Fig.11a It is along Fig.10aA cross-sectional view taken along line V-V' of Fig.11b It is along Fig.10b A cross-sectional view taken along line V-V'.

[0206] The display element layer DPL according to an embodiment of the present disclosure may include first to fourth electrodes EL1 to EL4 disposed on a substrate SUB, an insulating layer INS, and a light emitting element LD. Here, in the third direction DR3, the first electrode EL1 and the second electrode EL2 may be disposed on a surface different from that of the third electrode EL3 and the fourth electrode EL4, and the insulating layer INS is interposed between the first electrode EL1 and the second electrode EL2 and the third electrode EL3 and the fourth electrode EL4.

[0207] like Fig.10a and Fig.11a As shown in , the insulating layer INS may be disposed on one surface of the substrate SUB on which the first electrode EL1 and the second electrode EL2 are disposed, and the third electrode EL3 and the fourth electrode EL4 and the light emitting element LD may be disposed on the insulating layer INS. Fig.10b and Fig.11b As shown in FIG. 1 , an insulating layer INS may be disposed on one surface of a substrate SUB on which the third and fourth electrodes EL3 and EL4 are disposed, and the first and second electrodes EL1 and EL2 and the light emitting element LD may be disposed on the insulating layer INS.

[0208] The first electrode EL1 may include a first protrusion P1 protruding toward the second electrode EL2 , and the second electrode EL2 may include a second protrusion P2 protruding toward the first electrode EL1 , wherein the first protrusion P1 and the second protrusion P2 may be alternately arranged in the first direction DR1 .

[0209] The insulating layer INS may overlap with the emission region in which the light emitting element LD is arranged. In addition, a portion of the insulating layer INS may overlap with the non-emission region (e.g., a region in which the 2-1st connection line CL2-1 and the 1-2nd connection line CL1-2 are arranged). The insulating layer INS may include an insulating material corresponding to any one of an inorganic insulating material and an organic insulating material.

[0210] refer to Fig.10a and Fig.11a, the insulating layer INS may be disposed on one surface of the substrate SUB on which the first bank BNK1 and the second bank BNK2, the first electrode EL1 and the second electrode EL2, and the 1-1 connecting wire CL1-1 to the 2-2 connecting wire CL2-2 are disposed. The third electrode EL3 and the fourth electrode EL4 and the light emitting element LD may be disposed on one surface of the insulating layer INS. The third electrode EL3 and the fourth electrode EL4 may be disposed to overlap with a portion of the first bank BNK1 and the second bank BNK2. That is, the third electrode EL3 and the fourth electrode EL4 may be disposed to correspond to the shape of the first bank BNK1 and the second bank BNK2.

[0211] The first electrode EL1 may be coupled to the 2-1st connection line CL2-1 on one surface of the substrate SUB. The bridge pattern BRP may be disposed in a region of the insulating layer INS overlapping the 2-1st connection line CL2-1. The bridge pattern BRP may connect the second electrode EL2 to the 1-1st connection line CL1-1 through a contact hole (not shown) passing through the insulating layer INS. The third electrode EL3 may be coupled to the 1-2nd connection line CL1-2 through a contact hole CH passing through the insulating layer INS. The insulating layer INS may not be disposed on the 2-2nd connection line CL2-2, and the fourth electrode EL4 may be coupled to the 2-2nd connection line CL2-2.

[0212] In various embodiments of the present disclosure, in the first electrode pair ELP1 including the first and second electrodes EL1 and EL2 and the second electrode pair ELP2 including the third and fourth electrodes EL3 and EL4 , the electrode pairs disposed on the insulating layer INS may be electrically connected to the light emitting element LD.

[0213] like Fig.10a and Fig.11a As shown in , the display element layer DPL may include a first contact electrode CNT1 for connecting the third electrode EL3 provided on the insulating layer INS to the first end (e.g., the anode electrode AE) of the light emitting element LD. In addition, the display element layer DPL may include a second contact electrode CNT2 for connecting the fourth electrode EL4 provided on the insulating layer INS to the second end (e.g., the cathode electrode CE) of the light emitting element LD.

[0214] The 1-2 connection line CL1-2 may be coupled to the first driving power source VDD, and the 2-2 connection line CL2-2 may be coupled to the second driving power source VSS. The first contact electrode CNT1 may provide a driving voltage of the first driving power source VDD transmitted through the third electrode EL3 to the first end of the light emitting element LD, and the second contact electrode CNT2 may provide a driving voltage of the second driving power source VSS transmitted through the fourth electrode EL4 to the second end of the light emitting element LD.

[0215] In various embodiments of the present disclosure, the third electrode EL3 may include a plurality of third protrusions P3 protruding toward the fourth electrode EL4. The plurality of third protrusions P3 may be arranged to be spaced apart from each other in the first direction DR1. The fourth electrode EL4 may include a plurality of fourth protrusions P4 protruding toward the third electrode EL3, and the plurality of fourth protrusions P4 may be arranged to be spaced apart from each other in the first direction DR1. The third protrusions P3 are disposed on a main portion of the third electrode EL3, and the fourth protrusions P4 are disposed on a main portion of the fourth electrode EL4, so that the first end (e.g., the anode electrode AE) of the light emitting element LD can be more easily directionally aligned to face the main portion of the first electrode EL1.

[0216] The light emitting element LD may be disposed between the first protrusion P1 and the second protrusion P2 with respect to the first direction DR1 and between the third protrusion P3 and the fourth protrusion P4 with respect to the second direction DR2. That is, the third protrusion P3 and the fourth protrusion P4 may face each other with the light emitting element LD interposed therebetween.

[0217] In an embodiment of the present disclosure, the first contact electrode CNT1 may connect the third protrusion P3 of the third electrode EL3 to the first end of the light emitting element LD, and the second contact electrode CNT2 may connect the fourth protrusion P4 of the fourth electrode EL4 to the second end of the light emitting element LD. The first contact electrode CNT1 is connected to the third protrusion P3, and the second contact electrode CNT2 is connected to the fourth protrusion P4, whereby the sizes of the first contact electrode CNT1 and the second contact electrode CNT2 may be reduced. In this way, the driving voltage transmitted through the third electrode EL3 and the fourth electrode EL4 may be effectively provided to the light emitting element LD.

[0218] The third electrode EL3 and the fourth electrode EL4 partially overlapping the first bank BNK1 and the second bank BNK2 may be reflective electrodes. The third electrode EL3 and the fourth electrode EL4 as reflective electrodes may guide light emitted from the light emitting element LD in a direction (eg, a forward direction) from the substrate SUB to the display element layer DPL.

[0219] refer to Fig.10b and Fig.11bThe insulating layer INS may be disposed on one surface of the substrate SUB on which the first bank BNK1 and the second bank BNK2, the third electrode EL3 and the fourth electrode EL4, and the 1-1 to 2-2 connection wires CL1-1 to CL2-2 are disposed. The third electrode EL3 and the fourth electrode EL4 may be disposed to overlap with portions of the first bank BNK1 and the second bank BNK2, and may be disposed to correspond to the shapes of the first bank BNK1 and the second bank BNK2. The first electrode EL1 and the second electrode EL2 and the light emitting element LD may be disposed on one surface of the insulating layer INS.

[0220] The third electrode EL3 may be coupled to the 1-2nd connection line CL1-2 on one surface of the substrate SUB. The bridge pattern BRP may be provided in a region of the insulating layer INS overlapping the 1-2nd connection line CL1-2. The bridge pattern BRP may connect the fourth electrode EL4 to the 2-2nd connection line CL2-2 through a contact hole (not shown) passing through the insulating layer INS. The first electrode EL1 may be coupled to the 2-1st connection line CL2-1 through a contact hole CH passing through the insulating layer INS. The insulating layer INS may not be provided on the 1-1st connection line CL1-1, and the second electrode EL2 may be coupled to the 1-1st connection line CL1-1.

[0221] The display element layer DPL may include a first contact electrode CNT1 for connecting the first electrode EL1 disposed on the insulating layer INS to the first end (e.g., the anode electrode AE) of the light emitting element LD. In addition, the display element layer DPL may include a second contact electrode CNT2 for connecting the second electrode EL2 disposed on the insulating layer INS to the second end (e.g., the cathode electrode CE) of the light emitting element LD.

[0222] The 2-1st connection line CL2-1 may be coupled to the first driving power source VDD, and the 1-1st connection line CL1-1 may be coupled to the second driving power source VSS. The first contact electrode CNT1 may provide a driving voltage of the first driving power source VDD transmitted through the first electrode EL1 to the first end of the light emitting element LD, and the second contact electrode CNT2 may provide a driving voltage of the second driving power source VSS transmitted through the second electrode EL2 to the second end of the light emitting element LD.

[0223] Fig.12 is a cross-sectional view showing a display device according to an embodiment of the present disclosure. Specifically, Fig.12 is a cross-sectional view of a display device including a display element layer DPL in which first to fourth electrodes EL1 to EL4 are provided on the same surface of a substrate SUB and the first and second electrodes EL1 and EL2 are electrically connected to the light emitting element LD.

[0224] like Fig.12 As shown in , the display device may include a substrate SUB, a pixel circuit layer PCL and a display element layer DPL.

[0225] The pixel circuit layer PCL may include a buffer layer BFL, a first transistor Tr1 , a second transistor Tr2 , and a driving voltage line DVL.

[0226] 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 Tr1 and the second transistor Tr2. The buffer layer BFL may be disposed in a single-layer structure or in a multi-layer structure having two or more layers. When the buffer layer BFL is disposed in a multi-layer structure, each layer may be formed of the same material or different materials. Meanwhile, the buffer layer BFL may be omitted depending on the material and processing conditions of the substrate SUB.

[0227] The first transistor Tr1 may be a driving transistor electrically connected to the light emitting element LD and configured to drive the light emitting element LD. The second transistor Tr2 may be a switching transistor electrically connected to the first transistor Tr1 and configured to switch the first transistor Tr1.

[0228] Each of the first transistor Tr1 and the second transistor Tr2 may include a semiconductor layer SCL, a gate electrode GE, a source electrode SE, and a drain electrode DE.

[0229] The semiconductor layer SCL may be disposed on the buffer layer BFL. The semiconductor layer SCL may include a source region and a drain region that contact the source electrode SE and the drain electrode DE corresponding thereto, respectively. 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 polycrystalline silicon, amorphous silicon, an oxide semiconductor, etc. The channel region may be a semiconductor pattern doped with impurities. Impurities such as n-type impurities, p-type impurities, or other metals may be used as the impurities.

[0230] The gate electrode GE may be disposed on the corresponding semiconductor layer SCL with the first gate insulating layer GI1 interposed therebetween.

[0231] The source electrode SE and the drain electrode DE included in the first transistor Tr1 may be respectively coupled to a source region and a drain region of the semiconductor layer SCL corresponding thereto through contact holes passing through the second gate insulating layer GI2 and the first gate insulating layer GI1 .

[0232] The source electrode SE and the drain electrode DE included in the second transistor Tr2 may be respectively coupled to a source region and a drain region of the semiconductor layer SCL corresponding thereto through contact holes passing through the second gate insulating layer GI2 and the first gate insulating layer GI1 .

[0233] The driving voltage line DVL may be disposed on the first gate insulating layer GI1, but the location of the driving voltage line DVL is not limited thereto. The driving voltage line DVL may be coupled to the second driving power source VSS, and a signal corresponding to a driving voltage may be provided from the driver to the driving voltage line DVL.

[0234] The pixel circuit layer PCL may further include a protective layer PSV for covering the first transistor Tr1 and the second transistor Tr2. The protective layer PSV may be provided in the form of an organic insulating layer, an inorganic insulating layer, or an organic insulating layer provided on an inorganic insulating layer. The inorganic insulating layer may include silicon oxide (SiO x ), silicon nitride (SiN x ), silicon oxynitride (SiON) and AlO x The organic insulating layer may include at least one of inorganic insulating materials of the present invention. The organic insulating layer may include an organic insulating material capable of transmitting light. The organic insulating layer may include, for example, at least one of polyacrylate resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, unsaturated polyester resin, polyphenylene ether resin, polyphenylene sulfide resin, and benzocyclobutene resin.

[0235] In addition, although the case where each of the transistors Tr1 and Tr2 is a thin film transistor having a top gate structure is described by way of example, the present disclosure is not limited thereto. In an embodiment, each of the transistors Tr1 and Tr2 may be a thin film transistor having a bottom gate structure.

[0236] refer to Fig.12 , the display element layer DPL may include first and second banks BNK1 and BNK2 , first to fourth electrodes EL1 to EL4 , a light emitting element LD, and first and second contact electrodes CNT1 and CNT2 .

[0237] The first bank BNK1 and the second bank BNK2 may be disposed to be spaced apart from each other in the second direction DR2 with the light emitting element LD interposed therebetween. The third electrode EL3 and the fourth electrode EL4 may be disposed on portions of the first bank BNK1 and the second bank BNK2. One of the first electrode EL1 and the second electrode EL2 may be electrically connected to at least one of the plurality of transistors Tr1 and Tr2 included in the pixel circuit layer PCL.

[0238] For example, the second electrode EL2 may be electrically connected to the drain electrode DE of the first transistor Tr1 through a contact hole passing through the protective layer PSV. The source electrode SE of the first transistor Tr1 may be electrically connected to the first driving power source VDD. In this way, the second electrode EL2 may receive a signal from the first transistor Tr1.

[0239] The first electrode EL1 may be electrically connected to the driving voltage line DVL through a contact hole passing through the protection layer PSV and the second gate insulating layer GI2 . ​​In this way, the first electrode EL1 may receive a signal from the driving voltage line DVL.

[0240] Through the second contact electrode CNT2, the first end (e.g., anode electrode AE) of the light emitting element LD can contact the second electrode EL2, and through the first contact electrode CNT1, the second end (e.g., cathode electrode CE) of the light emitting element LD can contact the first electrode EL1. Therefore, the light emitting element LD can receive a predetermined voltage through the first electrode EL1 and the second electrode EL2. When an electric field of a predetermined voltage or more is applied to both ends of the light emitting element LD, the light emitting element LD emits light when electrons and holes recombine with each other to generate electron-hole pairs in the active layer 12. That is, the first contact electrode CNT1 and the second contact electrode CNT2 can be used as driving electrodes for driving the light emitting element LD.

[0241] Light emitted from both ends of the light emitting element LD is reflected by the third electrode EL3 and the fourth electrode EL4 and may then be guided in an upward direction (eg, a forward direction) from the third direction DR3 .

[0242] The encapsulation layer INC may be disposed on the protective layer PSV on which the first to fourth electrodes EL1 to EL4, the first and second contact electrodes CNT1 and CNT2, and the light emitting element LD are disposed. The encapsulation layer INC may cover the first to fourth electrodes EL1 to EL4, the first and second contact electrodes CNT1 and CNT2, and the light emitting element LD so that they are not exposed to the outside, thereby preventing corrosion from occurring.

[0243] An overcoat layer OC may be disposed on the encapsulation layer INC. The overcoat layer OC may be an encapsulation layer for preventing oxygen and moisture from penetrating the light emitting element LD.

[0244] Figures 13a to 13e 1 is a plan view sequentially showing a method of manufacturing a display device according to an embodiment of the present disclosure. Specifically, Figures 13a to 13e The first electrode EL1, the second electrode EL2 and the third electrode EL3 are sequentially manufactured and arranged on the substrate SUB (see Figure 5a to Figure 5e ) and the first electrode EL1 and the second electrode EL2 are electrically connected to the light emitting element LD.

[0245] Fig.14 : is a diagram showing the torques that contribute to the alignment of the light emitting element and their mutual relationship.

[0246] In an implementation, the first electrode EL1, the second electrode EL2, and the third electrode EL3 may be formed on one surface of the substrate SUB. Fig.13a As shown in the figure, the first electrode EL1, the second electrode EL2 and the third electrode EL3 can be formed on the substrate SUB so that the main parts of the first electrode EL1, the second electrode EL2 and the third electrode EL3 extend in the first direction DR1, and the first electrode EL1, the second electrode EL2 and the third electrode EL3 are spaced apart from each other in the second direction DR2.

[0247] Before forming the first electrode EL1, the second electrode EL2, and the third electrode EL3, a first bank BNK1 and a second bank BNK2 may be formed on the substrate SUB. The first bank BNK1 and the second bank BNK2 may be formed to extend in the first direction DR1 and to be spaced apart from each other in the second direction DR2. The first electrode EL1 may be formed between the first bank BNK1 and the second bank BNK2, and the second electrode EL2 and the third electrode EL3 may be formed to face each other with the first electrode EL1 interposed therebetween. Fig.13a As shown in FIG. 1 , the second electrode EL2 and the third electrode EL3 may be formed to overlap portions of the first bank BNK1 and the second bank BNK2 . That is, the second electrode EL2 and the third electrode EL3 may be formed to correspond to the shapes of the first bank BNK1 and the second bank BNK2 .

[0248] A first protrusion P1 protruding from the first electrode EL1 toward the second electrode EL2 may be formed on the main body portion of the first electrode EL1. The step of forming the first protrusion P1 may be performed simultaneously with the step of forming the first electrode EL1. For example, the first electrode EL1 including the first protrusion P1 may be formed on the substrate SUB using a mask having the shape of the first electrode EL1 on which the first protrusion P1 is formed. A second protrusion P2 protruding from the second electrode EL2 toward the first electrode EL1 may be formed on the main body portion of the second electrode EL2. The step of forming the second protrusion P2 may be the same as the above-mentioned step of forming the first protrusion P1. Here, the first protrusion P1 and the second protrusion P2 may be formed to be alternately arranged in the first direction DR1.

[0249] In an embodiment of the present disclosure, a 1-1 connection line, a 1-2 connection line, and a 2-1 connection line may be formed on a substrate SUB on which the first electrode EL1, the second electrode EL2, and the third electrode EL3 are formed (see Figures 4a to 4f The connection relationship between the first electrode EL1, the second electrode EL2 and the third electrode EL3 and the 1-1 connection line CL1-1, the 1-2 connection line CL1-2 and the 2-1 connection line CL2-1 can be the same as that in the above reference Figures 4a to 4f Same as those described.

[0250] For example, on one surface of the substrate SUB, the second electrode EL2 may be coupled to the 2-1th connection line CL2-1, and the third electrode EL3 may be coupled to the 1-2th connection line CL1-2. Figure 5b As shown in FIG. 1 , an insulating layer INS may be formed on the 2-1th connection line CL2 - 1 , and the first electrode EL1 may be coupled to the 1-1th connection line CL1 - 1 through the bridge pattern BRP.

[0251] In the embodiments of the present disclosure, Fig.13b As shown in , in the step of providing the light emitting element LD, the light emitting element LD may be provided on a substrate SUB on which the first electrode EL1, the second electrode EL2, and the third electrode EL3 are formed. For example, the light emitting element LD may be injected into the emission region of the corresponding pixel PXL through an inkjet printing scheme, a slit coating scheme, or other various schemes. For example, the light emitting element LD may be mixed with a volatile solvent and then provided to the emission region of the corresponding pixel PXL through an inkjet printing scheme or a slit coating scheme.

[0252] In an embodiment of the present disclosure, a first alignment signal may be applied to the first electrode EL1 and the second electrode EL2, and thus the light emitting element LD may be preliminarily aligned. When the first alignment signal is applied to the first electrode EL1 and the second electrode EL2, self-alignment of the light emitting element LD may be induced due to an electric field formed between the first electrode EL1 and the second electrode EL2. That is, the first electrode EL1 and the second electrode EL2 may be used as alignment electrodes (or alignment lines) for aligning the light emitting element LD.

[0253] like Fig.13c As shown in , a first alignment signal may be applied to the first electrode EL1 and the second electrode EL2, thereby enabling primary alignment of the light emitting element LD so that the first end and the second end of the light emitting element LD face the first protrusion P1 and the second protrusion P2, respectively. That is, a first alignment signal may be applied to the first electrode pair ELP1 including the first electrode EL1 and the second electrode EL2, and thus the light emitting element LD may be primary aligned on the substrate SUB.

[0254] During the primary alignment, a 1-1st alignment signal may be applied to the first electrode EL1 through the 1-1st connecting line CL1-1, and a 1-2nd alignment signal may be applied to the second electrode EL2 through the 2-1st connecting line CL2-1. The 1-1st alignment signal and the 1-2nd alignment signal may have different voltage levels. The 1-1st alignment signal and the 1-2nd alignment signal may be signals having a voltage difference and / or a phase difference sufficient to align the light emitting element LD between the first protrusion P1 and the second protrusion P2. For example, the 1-1st alignment signal may be an alternating current (AC) signal, and the 1-2nd alignment signal may be a ground (GND) signal, but the present disclosure is not limited thereto.

[0255] In an embodiment of the present disclosure, the first end (e.g., anode electrode AE) of the light emitting element LD may face the first protrusion P1, and the second end (e.g., cathode electrode CE) thereof may face the second protrusion P2. Differently, the first end (e.g., anode electrode AE) of the light emitting element LD may face the second protrusion P2, and the second end (e.g., cathode electrode CE) thereof may face the first protrusion P1.

[0256] In an embodiment, the light emitting element LD is primarily aligned so that the first end and the second end of the light emitting element LD face the first protrusion P1 and the second protrusion P2, respectively, and thus the degree of directional alignment of the light emitting element LD between the first electrode EL1 and the second electrode EL2 can be improved during the secondary alignment, which will be described later. Specifically, when the light emitting element LD is aligned perpendicular to the second direction DR2 (or aligned parallel to the first direction DR1) during the primary alignment, the degree of directional alignment of the light emitting element LD can be ensured to the maximum extent.

[0257] exist Fig.14 In the embodiment, the angle θ may be an angle between the direction of the electric field and the direction of the long axis connecting the first end and the second end of each light emitting element LD to each other. For example, the angle θ may be an angle of the long axis of the light emitting element LD relative to the second direction DR2. Fig.14 In the case of torque EP(T EP ) may indicate a rotational force caused by a dipole moment in the light emitting element LD and may be defined by the following equation 1. Here, T EP It can be represented by the function of Sin*Sin.

[0258] [Equation 1]

[0259] T EP =pХE

[0260] In Equation 1, p may mean an internal dipole moment occurring in a process for manufacturing the light emitting element LD. Here, p=QW / 2, Q may be a charge, and W may be a width of a depletion layer.

[0261] In addition, Fig.14 In the case of torque DEP (T DEP ) may mean a rotational force according to a dipole moment caused by an externally applied electric field, and may be defined by the following equation 2. In this case, T DEP It can be represented by the function of Cos*Sin.

[0262] [Equation 2]

[0263] T DEP =pХE

[0264] In Equation 2, p may be a dipole moment induced in the light emitting element LD due to an electric field.

[0265] refer to Fig.14 , when the angle between the direction of the long axis of the light emitting element LD and the direction of the electric field is 90°, the T formed in the light emitting element LD in the secondary alignment can be maximized. EP , and T DEP It can be 0. In this way, the primary alignment can be completed, and the degree of directional alignment of the light emitting element LD can be ensured to the maximum extent during the secondary alignment.

[0266] In various embodiments of the present disclosure, each first protrusion P1 may include a first end T1 adjacent to the main portion of the second electrode EL2 and a second end T2 adjacent to the main portion of the first electrode EL1, and each second protrusion P2 may include a first end T1' adjacent to the main portion of the first electrode EL1 and a second end T2' adjacent to the main portion of the second electrode EL2.

[0267] like Figures 13a to 13e As shown in , the width of the first ends T1 and T1' of the first protrusion P1 and the second protrusion P2 in the first direction DR1 may be greater than the width of the second ends T2 and T2' thereof in the first direction DR1. The width of the first ends T1 and T1' of the first protrusion P1 and the second protrusion P2 is formed to be greater than the width of the second ends T2 and T2' thereof, whereby the major axis of the light emitting element LD has an angle of 90° with respect to the second direction DR2, and the primary alignment of the light emitting element LD may be facilitated. Through this process, the degree of directional alignment of the light emitting element LD may be improved during the secondary alignment.

[0268] In an embodiment of the present disclosure, a second alignment signal may be applied to the second electrode EL2 and the third electrode EL3, and thus the light emitting element LD may be secondarily aligned. That is, the second electrode EL2 and the third electrode EL3 may serve as alignment electrodes (or alignment lines) for aligning the light emitting element LD.

[0269] like Fig.13d As shown in , the second alignment signal may be applied to the second electrode EL2 and the third electrode EL3, and thus the first end of the corresponding light emitting element LD may be secondarily aligned to face the main body portion of one of the first electrode EL1 and the second electrode EL2. The first end (e.g., anode electrode AE) of the light emitting element LD may face the main body portion of the first electrode EL1, and the second end (e.g., cathode electrode CE) thereof may face the main body portion of the second electrode EL2. That is, the second alignment signal may be applied to the second electrode pair ELP2 including the second electrode EL2 and the third electrode EL3, and thus the light emitting element LD may be directionally aligned on the substrate SUB.

[0270] During the secondary alignment, a 2-1st alignment signal may be applied to the third electrode EL3 through the 1-2nd connecting line CL1-2, and a 2-2nd alignment signal may be applied to the second electrode EL2 through the 2-1st connecting line CL2-1. The 2-1st alignment signal and the 2-2nd alignment signal may have different voltage levels. The 2-1st alignment signal and the 2-2nd alignment signal may be signals having a voltage difference and / or a phase difference sufficient to directionally align the light emitting element LD between the first electrode EL1 and the second electrode EL2. For example, the 2-1st alignment signal may be an alternating current (AC) signal, and the 2-2nd alignment signal may be a ground (GND) signal, but the present disclosure is not limited thereto.

[0271] In an embodiment of the present disclosure, the frequency of the first alignment signal may be higher than the frequency of the second alignment signal. That is, a first alignment signal having a high frequency may be applied to the first electrode pair ELP1, and a second alignment signal having a low frequency may be applied to the second electrode pair ELP2. By utilizing a high frequency as the first alignment signal to be applied when the light emitting element LD is primarily aligned, the angle of the long axis of the light emitting element LD relative to the second direction DR2 during the primary alignment may be formed to be closer to 90°. For example, the first alignment signal may have a frequency equal to or higher than 1 kHz and lower than or equal to 1 mHz, and the second alignment signal may have a frequency lower than 1 kHz, but the frequencies of the first alignment signal and the second alignment signal are not limited thereto.

[0272] In an embodiment of the present disclosure, the waveform of the second alignment signal may be a square wave, a sawtooth wave or a pulse wave. For example, the pulse wave may be a DC pulse wave. The second alignment signal having a waveform of a square wave, a sawtooth wave or a pulse wave is applied to the second electrode pair ELP2, and thus the light emitting element LD may be effectively directionally aligned. At the same time, the waveform of the first alignment signal is not particularly limited, and may be the same as or different from the waveform of the second alignment signal.

[0273] In an embodiment of the present disclosure, after the application of the first alignment signal to the first electrode pair ELP1 has been stopped, the second alignment signal may be applied to the second electrode pair ELP2 when a predetermined time has passed. A predetermined interval is provided between the time when the application of the first alignment signal is stopped and the time when the second alignment signal is applied, and thus the degree of directional alignment of the light emitting element LD may be improved during the secondary alignment. At the same time, while the application of the first alignment signal to the first electrode pair ELP1 is stopped, the second alignment signal may be applied to the second electrode pair ELP2.

[0274] In an embodiment of the present disclosure, directional alignment is performed so that the corresponding first end of the light emitting element LD faces the main portion of one of the first electrode EL1 and the second electrode EL2 on the substrate SUB, after which other methods are used to volatilize or remove the solvent, so that the light emitting element LD can be fixed in the corresponding emission area of ​​the pixel PXL in a directional alignment state.

[0275] In an embodiment of the present disclosure, a method for manufacturing a display device may include forming a first contact electrode CNT1 for electrically connecting at least one of the first electrode EL1 and the third electrode EL3 to the light emitting element LD and a second contact electrode CNT2 for electrically connecting the second electrode EL2 to the light emitting element LD. In detail, the first contact electrode CNT1 may electrically connect at least the first electrode EL1 of the first electrode EL1 and the third electrode EL3 to the light emitting element LD.

[0276] like Fig.13e As shown in , the first contact electrode CNT1 may connect the first end (e.g., anode electrode AE) of the light emitting element LD to the first electrode EL1, and the second contact electrode CNT2 may connect the second end (e.g., cathode electrode CE) of the light emitting element LD to the second electrode EL2. Here, the 1-1 connection line CL1-1 coupled to the first electrode EL1 may be coupled to the first driving power source VDD, and the 2-1 connection line CL2-1 coupled to the second electrode EL2 may be coupled to the second driving power source VSS.

[0277] In the embodiment of the present disclosure, after the first contact electrode CNT1 and the second contact electrode CNT2 have been formed, an encapsulation layer INC (see Fig.12 ). The encapsulation layer INC is formed, and thus the light emitting element LD aligned in a direction may be fixed finally. In addition, an overcoat layer OC may be formed on the encapsulation layer INC (see Fig.12 ).

[0278] In an embodiment of the present disclosure, the step of forming the first electrode EL1, the second electrode EL2, and the third electrode EL3 may include: forming the first electrode EL1 and the second electrode EL2 on the substrate SUB, forming an insulating layer INS on the substrate SUB on which the first electrode EL1 and the second electrode EL2 are formed, and forming the third electrode EL3 on the insulating layer INS. In this way, a device including Figures 6a to 7b A display device with a display element layer DPL shown in FIG.

[0279] Figures 15a to 15g 1 is a plan view sequentially showing a method of manufacturing a display device according to another embodiment of the present disclosure. Specifically, Figures 15a to 15g are plan views sequentially showing a method of manufacturing a display device in which the first and second electrodes EL1 and EL2 and the third and fourth electrodes EL3 and EL4 are provided on different surfaces of a substrate SUB and the third and fourth electrodes EL3 and EL4 are electrically connected to a light emitting element LD.

[0280] Figures 15a to 15g The case where the first electrode EL1 and the second electrode EL2 are formed on the substrate SUB, the insulating layer INS is formed on the substrate SUB on which the first electrode EL1 and the second electrode EL2 are formed, and the third electrode EL3 and the fourth electrode EL4 and the light emitting element LD are disposed on the insulating layer INS. Unlike this case, a separate insulating layer INS is not formed in the emission region, and the first electrode EL1 to the fourth electrode EL4 and the light emitting element LD are disposed on one surface of the substrate SUB, and thus a device including Figures 8a to 9b In the following, as shown in FIG. Figures 15a to 15g As shown in FIG, description will be made based on an embodiment in which a first electrode pair ELP1 including a first electrode EL1 and a second electrode EL2 and a second electrode pair ELP2 including a third electrode EL3 and a fourth electrode EL4 are provided on different surfaces with an insulating layer INS interposed therebetween.

[0281] In the embodiments of the present disclosure, Fig.15aAs shown in , a first electrode pair ELP1 including a first electrode EL1 and a second electrode EL2 whose main portions extend in a first direction DR1 and are spaced apart from each other in a second direction DR2 may be formed on a substrate SUB. Here, the first electrode EL1 may include a first protrusion P1 protruding toward the second electrode EL2, and the second electrode EL2 may include a second protrusion P2 protruding toward the first electrode EL1. The first protrusion P1 and the second protrusion P2 may be alternately arranged in the first direction DR1.

[0282] The 1-1th to 2-2nd connection lines CL1-1 to CL2-2 may be disposed on one surface of the substrate SUB (see Figures 8a to 9b ). The first electrode EL1 may be coupled to the 2-1th connection line CL2-1. The second electrode EL2 may be coupled to the 1-1th connection line CL1-1 through the bridge pattern BRP disposed on the insulating layer INS and overlapping the 2-1th connection line CL2-1.

[0283] like Fig.15b As shown in FIG. 1 , an insulating layer INS may be formed on the substrate SUB on which the first electrode EL1 and the second electrode EL2 are formed. Fig.15c As shown in , a second electrode pair ELP2 including a third electrode EL3 and a fourth electrode EL4 may be formed on the insulating layer INS, wherein the third electrode EL3 and the fourth electrode EL4 include a body portion extending in the first direction DR1 and are spaced apart from each other in the second direction DR2 with the first electrode pair ELP1 interposed therebetween. The third electrode EL3 may be coupled to the 1-2 connection line CL1-2 through a contact hole passing through the insulating layer INS, and the fourth electrode EL4 may be coupled to the 2-2 connection line CL2-2.

[0284] like Fig.15d As shown in FIG. 1 , the light emitting element LD may be provided on the insulating layer INS on which the second electrode pair ELP2 is formed. Fig.15e As shown in , a first alignment signal may be applied to the first electrode pair ELP1 so that the light emitting element LD may be primarily aligned so that the first and second ends of the light emitting element LD face the first and second protrusions P1 and P2.

[0285] During the primary alignment, a 1-1th alignment signal may be applied to the first electrode EL1 through a 2-1th connection line CL2-1, and a 1-2th alignment signal may be applied to the second electrode EL2 through a 1-1th connection line CL1-1. For example, the 1-1th alignment signal may be a ground (GND) signal, and the 1-2nd alignment signal may be an alternating current (AC) signal, but the present disclosure is not limited thereto.

[0286] After completing the primary alignment, Fig.15f As shown in , a second alignment signal may be applied to the second electrode pair ELP2, whereby the light emitting element LD may be secondarily aligned (directionally aligned) so that its respective first end faces a main portion of one of the first electrode EL1 and the second electrode EL2.

[0287] During the secondary alignment, a 2-1st alignment signal may be applied to the third electrode EL3 through the 1-2nd connection line CL1-2, and a 2-2nd alignment signal may be applied to the fourth electrode EL4 through the 2-2nd connection line CL2-2. For example, the 2-1st alignment signal may be an alternating current (AC) signal, and the 2-2nd alignment signal may be a ground (GND) signal, but the present disclosure is not limited thereto.

[0288] In an embodiment of the present disclosure, relative to the second direction DR2, the third electrode EL3 may include a third protrusion P3 protruding toward the fourth electrode EL4, and the fourth electrode EL4 may include a fourth protrusion P4 protruding toward the third electrode EL3. By forming the third protrusion P3 and the fourth protrusion P4, the light emitting element LD can be more effectively directionally aligned. In this way, the light emitting element LD can be directionally aligned in a state where the first end (e.g., anode electrode AE) of the light emitting element LD faces the third protrusion P3 and the second end (e.g., cathode electrode CE) thereof faces the fourth protrusion P4.

[0289] After the directional alignment of the light emitting element LD has been completed, the residual solvent on the insulating layer INS is removed, whereby the directional aligned light emitting element LD can be fixed on the insulating layer INS. Figure 15g As shown in FIG. 1 , a first contact electrode CNT1 for connecting the third protrusion P3 to the first end of the light emitting element LD and a second contact electrode CNT2 for connecting the fourth protrusion P4 to the second end of the light emitting element LD may be formed. In the embodiment of the present disclosure, after the first contact electrode CNT1 and the second contact electrode CNT2 have been formed, an encapsulation layer INC may be formed on the insulating layer INS (see FIG. 1 ). Fig.12 ). The encapsulation layer INC is formed, and thus the directionally aligned light emitting element LD can be finally fixed. In addition, an overcoat layer OC can be formed on the encapsulation layer INC (see Fig.12 ).

[0290] The foregoing detailed description is intended to illustrate and explain the present disclosure. In addition, the content described above is only intended to represent and describe the embodiments of the present disclosure, and as described above, the present disclosure can be used in various other combinations, modifications and environments, and can be changed or modified within the scope of the concept of the present disclosure disclosed in this specification, the equivalence of the disclosed content and / or the scope known to those skilled in the art or in the art. Therefore, the foregoing detailed description of the present disclosure is not intended to limit the present disclosure to the disclosed embodiments. In addition, the attached claims should be interpreted as including alternative embodiments.

Claims

1. A display device, comprising: substrate; as well as A display element layer is provided on the first surface of the substrate and includes a plurality of light emitting elements. Wherein, the display element layer comprises: A first electrode and a second electrode are configured to each include a main body portion extending in a first direction and to be spaced apart from each other in a second direction different from the first direction; and a third electrode configured to include a main body portion extending in the first direction and facing the second electrode, with the first electrode interposed between the second electrode and the third electrode, Wherein, the first electrode further includes a first protrusion protruding toward the second electrode, Wherein, the second electrode further includes a second protrusion protruding toward the first electrode, wherein the first protrusions and the second protrusions are arranged alternately in the first direction, and Each of the light emitting elements is disposed between the first protrusion and the second protrusion, and a first end of each of the light emitting elements is aligned toward a main body portion of one of the first electrode and the second electrode.

2. The display device according to claim 1, wherein: The first to third electrodes and the light emitting element are provided on the same surface of the substrate.

3. The display device according to claim 2, wherein: The display element layer further comprises: a first contact electrode configured to electrically connect at least one of the first electrode and the third electrode to the light emitting element; and The second contact electrode is configured to electrically connect the second electrode to the light emitting element.

4. The display device according to claim 3, wherein: The first contact electrode comprises: a plurality of first sub-contact electrodes coupled to a portion of the first electrode adjacent to the light emitting element and spaced apart from each other in the first direction, and The second contact electrode comprises: A plurality of second sub-contact electrodes are coupled to a portion of the second electrode adjacent to the light emitting element and are spaced apart from each other in the first direction.

5. The display device according to claim 1, wherein: The display element layer further comprises: an insulating layer, disposed on the first electrode and the second electrode, The third electrode and the light emitting element are provided on the insulating layer.

6. The display device according to claim 5, wherein: The third electrode includes a third protrusion protruding toward the second electrode.

7. The display device according to claim 6, wherein: The display element layer further comprises: a first contact electrode configured to electrically connect the light emitting element and the third protrusion to each other; and The second contact electrode is configured to electrically connect the light emitting element to the second electrode.

8. The display device according to claim 1, wherein: The first protrusion includes a first end adjacent to the main body portion of the second electrode and a second end adjacent to the main body portion of the first electrode, The second protrusion includes a first end adjacent to the main body portion of the first electrode and a second end adjacent to the main body portion of the second electrode, and In the first direction, a width of each of the first ends is greater than a width of each of the second ends.

9. The display device according to claim 1, wherein: The display element layer further comprises: The fourth electrode is configured to include a main body portion extending in the first direction and to face the first electrode, with the second electrode interposed between the first electrode and the fourth electrode.

10. The display device according to claim 9, wherein: The first to fourth electrodes and the light emitting element are provided on the same surface of the substrate.

11. The display device according to claim 10, wherein: The display element layer further comprises: a first contact electrode configured to electrically connect at least one of the first electrode and the third electrode to the light emitting element; and A second contact electrode is configured to electrically connect at least one of the second electrode and the fourth electrode to the light emitting element.

12. The display device according to claim 9, wherein: In the direction from the substrate to the display element layer, the first electrode and the second electrode are arranged on a surface different from a surface on which the third electrode and the fourth electrode are arranged, and an insulating layer is interposed between the first electrode and the second electrode and the third electrode and the fourth electrode.

13. The display device according to claim 12, wherein: The light emitting element is disposed on the insulating layer, and Among the first electrode pair including the first electrode and the second electrode and the second electrode pair including the third electrode and the fourth electrode, the electrode pair provided on the insulating layer is electrically connected to the light emitting element.

14. The display device according to claim 12, wherein: The third electrode further includes a third protrusion protruding toward the fourth electrode, The fourth electrode further includes a fourth protrusion protruding toward the third electrode, and The third protrusion faces the fourth protrusion, and the light emitting element is interposed between the third protrusion and the fourth protrusion.

15. A method for manufacturing a display device, comprising: forming a first electrode, a second electrode, and a third electrode on a substrate so that the first electrode, the second electrode, and the third electrode each include a body portion extending in a first direction and are spaced apart from each other in a second direction different from the first direction; providing a light emitting element on the substrate on which the first to third electrodes are formed; preliminarily aligning the light emitting element by applying a first alignment signal to the first electrode and the second electrode; as well as secondarily aligning the light emitting element by applying a second alignment signal to the third electrode and the second electrode, wherein the first electrode further comprises a first protrusion protruding toward the second electrode, and the second electrode further comprises a second protrusion protruding toward the first electrode, and Wherein, when the first alignment signal is applied to the first electrode and the second electrode, the light emitting element is aligned so that the first end and the second end of the light emitting element face the first protrusion and the second protrusion respectively.

16. The method according to claim 15, wherein: The frequency of the first alignment signal is higher than the frequency of the second alignment signal.

17. The method according to claim 15, wherein: Secondarily aligning the light emitting element includes aligning the light emitting element such that the first end of the light emitting element faces the main portion of one of the first electrode and the second electrode.

18. The method according to claim 15, wherein: The waveform of the second alignment signal is a square wave, a sawtooth wave or a pulse wave.

19. The method according to claim 15, further comprising: A first contact electrode configured to electrically connect at least one of the first electrode and the third electrode to the light emitting element and a second contact electrode configured to electrically connect the second electrode to the light emitting element are formed.

20. A method for manufacturing a display device, comprising: forming a first electrode and a second electrode on a substrate, the first electrode and the second electrode each including a main body portion extending in a first direction and being spaced apart from each other in a second direction different from the first direction; forming a third electrode and a fourth electrode on the substrate, the third electrode and the fourth electrode each including a main body portion extending in the first direction, and the third electrode and the fourth electrode facing each other with the first electrode and the second electrode interposed therebetween; providing a light emitting element on the substrate on which the first to fourth electrodes are formed; preliminarily aligning the light emitting element by applying a first alignment signal to the first electrode and the second electrode; as well as secondarily aligning the light emitting element by applying a second alignment signal to the third electrode and the fourth electrode, wherein the first electrode further comprises a first protrusion protruding toward the second electrode, and the second electrode further comprises a second protrusion protruding toward the first electrode, and Wherein, when the first alignment signal is applied to the first electrode and the second electrode, the light emitting element is aligned so that the first end and the second end of the light emitting element face the first protrusion and the second protrusion respectively.

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