Display device

Abstract

A display device is provided. According to one embodiment, the display device includes: a first electrode trunk and a second electrode trunk extending in a first direction and spaced apart from each other; at least one first electrode branch branching out from the first electrode trunk and arranged to extend in a second direction different from the first direction; a second electrode branch branching out from the second electrode trunk and arranged to extend in the second direction; at least one third electrode arranged between the first electrode branch and the second electrode branch; and at least one light emitting device arranged between the first electrode branch, the third electrode, and the second electrode branch, wherein the third electrode is arranged to extend in the second direction, and two ends of the third electrode extending in the second direction may terminate in a state spaced apart from the first electrode trunk and the second electrode trunk, respectively.

Description

Technical Field

[0001] The present disclosure relates to a display device, and more particularly, to a display device including an inorganic light emitting diode array. Background Art

[0002] As multimedia technology develops, display devices are becoming more and more important. Therefore, various types of display devices such as organic light emitting display devices and liquid crystal display (LCD) devices are currently used.

[0003] The display device is used to display an image and includes a display panel such as an organic light emitting display panel or a liquid crystal display panel. Among them, the light emitting display panel may include a light emitting element. For example, a light emitting diode (LED) may include an organic light emitting diode (OLED) using an organic material as a fluorescent material and an inorganic light emitting diode using an inorganic material as a fluorescent material.

[0004] Organic light emitting diodes (OLEDs) use organic materials as fluorescent materials for light emitting elements. It is desirable that the manufacturing process is simple and the elements have flexibility. However, it is well known that organic materials are susceptible to high temperature driving environments and that the efficiency of blue light is relatively low.

[0005] In contrast, inorganic light emitting diodes use inorganic semiconductors as fluorescent materials and are expected to have durability in high temperature environments and have higher blue light efficiency than organic light emitting diodes. Previously, the process of manufacturing inorganic light emitting diodes had its own shortcomings. However, a transfer method using dielectrophoresis (DEP) has been developed, which has overcome the shortcomings. Therefore, since inorganic light emitting diodes have better durability and efficiency than organic light emitting diodes, research on inorganic light emitting diodes is underway. Summary of the invention

[0006] Technical issues

[0007] Aspects of the present disclosure provide a display device in which light emitting elements are connected in series, so that the capacity of a driving transistor can be reduced, and voltage division efficiency and power loss caused by line resistance can be improved.

[0008] Additional advantages, subjects, and features of the invention will be set forth in part in the description which follows, and in part will become apparent to one of ordinary skill in the art upon examination of the following, or may be learned from practice of the invention.

[0009] Technical Solution

[0010] According to aspects of the present disclosure, a display device includes: a first electrode trunk and a second electrode trunk, extending in a first direction and spaced apart from each other; at least one first electrode branch, branching out from the first electrode trunk and extending in a second direction different from the first direction; a second electrode branch, branching out from the second electrode trunk and extending in the second direction; at least one third electrode, arranged between the first electrode branch and the second electrode branch; and one or more light-emitting elements, arranged between the first electrode branch and the third electrode and between the third electrode and the second electrode branch, wherein the third electrode extends in the second direction and two ends of the third electrode in the second direction are spaced apart from the first electrode trunk and the second electrode trunk, respectively.

[0011] The first electrode branch portion may extend opposite to the second electrode branch portion in the second direction.

[0012] The light-emitting element may include: a first light-emitting element, arranged between the first electrode branch and the third electrode; and a second light-emitting element, arranged between the third electrode and the second electrode branch, wherein the first light-emitting element and the second light-emitting element may be connected in series between the first electrode branch and the second electrode branch.

[0013] The first end of the first light-emitting element may be connected to the first electrode branch, and the second end of the first light-emitting element may be connected to the third electrode, wherein the first end or the second end of the first light-emitting element may include a p-type semiconductor layer, and the second end or the first end of the first light-emitting element may include an n-type semiconductor layer, wherein the first light-emitting element may include an active material layer disposed between the p-type semiconductor layer and the n-type semiconductor layer.

[0014] The display device may include a plurality of first electrode branch portions branching from the first electrode trunk portion, and the second electrode branch portions may be disposed between the plurality of first electrode branch portions.

[0015] The third electrode may be disposed at least between the second electrode branch portion and the first electrode branch portion disposed on one side of the second electrode branch portion and between the second electrode branch portion and the first electrode branch portion disposed on an opposite side of the second electrode branch portion.

[0016] The display device may include two or more third electrodes, wherein the light emitting element may be provided between adjacent ones of the third electrodes.

[0017] The light-emitting element may include: a third light-emitting element electrically connected to one side of the second electrode branch; and a fourth light-emitting element electrically connected to the opposite side of the second electrode branch, wherein the third light-emitting element and the fourth light-emitting element may be connected in parallel between one side and the opposite side of the second electrode branch.

[0018] The plurality of first electrode branches and the plurality of third electrodes may be symmetrically disposed with respect to the second electrode branches.

[0019] The third electrode may include: a third electrode segment protruding from the first electrode trunk portion and the second electrode trunk portion in the second direction; and a third electrode branch portion disposed to be spaced apart from the third electrode segment, the third electrode branch portion extending from the third electrode segment.

[0020] The third electrode may include: two or more third electrode branches, which are spaced apart from each other between the first electrode branch and the second electrode branch, wherein the light-emitting element may include: a fifth light-emitting element having one end electrically connected to the first electrode branch and the other end connected to the third electrode branch; a sixth light-emitting element having two ends electrically connected to multiple third electrode branches; and a seventh light-emitting element having one end electrically connected to the third electrode branch and the other end connected to the second electrode branch, wherein the fifth light-emitting element, the sixth light-emitting element and the seventh light-emitting element may be connected in series between the first electrode branch and the second electrode branch.

[0021] According to another aspect of the present disclosure, a display device includes: a first electrode trunk and a second electrode line, extending in a first direction and spaced apart from each other; at least one first electrode branch, branching out from the first electrode trunk and extending in a second direction different from the first direction; a second electrode branch, spaced apart from the first electrode branch and extending in the second direction to terminate in a state spaced apart from the first electrode trunk; a third electrode, arranged between the first electrode branch and the second electrode branch to extend in the second direction, both ends of the third electrode terminating in a state spaced apart from the first electrode trunk and the second electrode line; and one or more light-emitting elements, arranged between the first electrode branch, the second electrode branch and the third electrode, wherein the second electrode branch is electrically connected to the second electrode line.

[0022] The first electrode trunk portion and the second electrode line may be disposed in different line layers, wherein the second electrode branch portion may be electrically connected to the second electrode line through a contact hole.

[0023] The first electrode trunk portion may further include: a second electrode segment protruding from the first electrode trunk portion in the second direction.

[0024] The second electrode segment may extend in the second direction and be aligned with the second electrode branch.

[0025] The first electrode trunk can be electrically connected to a thin film transistor, wherein the second electrode line is electrically connected to a power supply line, wherein the light-emitting element may include: a first light-emitting element, arranged between the first electrode branch and the third electrode; and a second light-emitting element, arranged between the third electrode and the second electrode branch, wherein the first light-emitting element and the second light-emitting element can be connected in series between the first electrode branch and the second electrode branch.

[0026] According to other aspects of the present disclosure, a display device includes: a first electrode connected to a thin film transistor; a second electrode connected to a power supply line; a floating electrode arranged between the first electrode and the second electrode; at least one first light-emitting diode having one end electrically connected to the first electrode and another end electrically connected to the floating electrode; and at least one second light-emitting diode having one end electrically connected to the floating electrode and another end electrically connected to the second electrode, wherein the first light-emitting diode and the second light-emitting diode are connected in series between the first electrode and the second electrode.

[0027] The first electrode, the second electrode, and the floating electrode may extend in a first direction, wherein a longitudinal direction of each of the first light emitting diode and the second light emitting diode may extend in a second direction different from the first direction.

[0028] The first light emitting diode and the second light emitting diode may each include a first conductive semiconductor layer, an active material layer, and a second conductive semiconductor layer, wherein one of the first conductive semiconductor layer and the second conductive semiconductor layer may be a p-type conductive semiconductor layer, and the other may be an n-type conductive semiconductor layer, wherein the first conductive semiconductor layer of the first light emitting diode may be electrically connected to the first electrode, the second conductive semiconductor layer of the first light emitting diode may be electrically connected to the floating electrode, the first conductive semiconductor layer of the second light emitting diode may be electrically connected to the floating electrode, and the second conductive semiconductor layer of the second light emitting diode may be electrically connected to the second electrode.

[0029] The length of the first light emitting diode and the second light emitting diode may be in the range of 3 μm to 6 μm.

[0030] Details of other embodiments are included in the detailed description and accompanying drawings.

[0031] Beneficial Effects

[0032] According to an exemplary embodiment of the present disclosure, a display device includes a floating electrode between a first electrode and a second electrode, so that a light-emitting element electrically connected between the electrodes can be connected in series between the first electrode and the second electrode. Therefore, during a process of manufacturing the display device, it is easier to design the capacity of the driving thin film transistor, and it is possible to improve voltage division efficiency and power loss caused by line resistance.

[0033] Advantageous effects according to the present disclosure are not limited to those mentioned above, and various other advantageous effects are included herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a plan view of a display device according to an exemplary embodiment of the present disclosure.

[0035] Figure 2 yes Figure 1 Equivalent circuit diagram of a single pixel of a display device.

[0036] Figure 3 is an equivalent circuit diagram of a pixel of a display device according to another exemplary embodiment of the present disclosure.

[0037] Figure 4 It is along Figure 1 A cross-sectional view taken along line II'.

[0038] Figure 5 is a plan view of a display device according to another exemplary embodiment of the present disclosure.

[0039] Figure 6 It is along Figure 5 Cross-sectional views taken along lines II-II' and III-III'.

[0040] Figure 7 is a diagram illustrating a light emitting element according to an exemplary embodiment of the present disclosure.

[0041] Figures 8 to 10 is a plan view schematically illustrating a method of manufacturing a display device according to an exemplary embodiment of the present disclosure.

[0042] Figures 11 to 13 is a plan view of a display device according to another exemplary embodiment of the present disclosure.

[0043] Fig.14 is a plan view of a display device according to still another exemplary embodiment of the present disclosure.

[0044] Figures 15 to 17 is used to show the manufacturing Fig.14 A plan view of a display device of the method.

[0045] Fig.18 and Fig.19 is a plan view of a display device according to another exemplary embodiment of the present disclosure.

[0046] Fig. 20 is a plan view of a display device according to still another exemplary embodiment of the present disclosure.

[0047] Figure 21 to Figure 23 is used to show the manufacturing Fig. 20A plan view of a display device of the method. DETAILED DESCRIPTION

[0048] The present invention will now be described more fully hereinafter with reference to the accompanying drawings in which preferred embodiments of the invention are shown. However, the present invention may be implemented in different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the scope of the invention to those skilled in the art.

[0049] It will be understood that when a layer is referred to as being “on” another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may also be present. The same reference numerals refer to the same components throughout the specification.

[0050] It will be understood 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 invention, the first element discussed below may be referred to as the second element. Similarly, the second element may also be referred to as the first element.

[0051] Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0052] Figure 1 is a plan view of a display device according to an exemplary embodiment of the present disclosure.

[0053] The display device 10 may include one or more regions defined as pixels PX (e.g., one of pixels PX1, PX2, PX3). A plurality of pixels PX may be disposed on a display portion of the display device 10 so that light of a specific wavelength band may leave the display device 10. Figure 1 1, three pixels PX1, PX2, and PX3 are depicted by way of example, but it will be understood that the display device 10 may include more pixels. Figure 1 The cross-sectional view of FIG. 1 shows pixels PX arranged only in one direction (ie, the first direction D1), but the pixels PX may also be arranged in a second direction D2 crossing the first direction D1. In addition, Figure 1 The pixel PX shown in FIG. 1 may be divided into a plurality of sub-pixels, each of which may form a pixel PX (eg, one of pixels PX1, PX2, PX3). Figure 1 Instead of being arranged in parallel along the first direction D1 as shown in FIG. 1 , the plurality of electrodes may be arranged in various manners, for example, in a vertical direction (or the second direction D2 ), in a zigzag pattern, and the like.

[0054] Although not shown in the drawings, the display device 10 may include an emitting portion in which a light emitting element 350 is disposed to emit colored light and a non-emitting portion defined as an area outside the emitting portion. The non-emitting portion may be covered by some components so that it is not visible from the outside of the display device 10. In the non-emitting portion, various elements for driving the light emitting element 350 disposed in the emitting portion are positioned. For example, in the non-emitting portion, a line for applying an electrical signal to the emitting portion, a circuit, a driver, etc. may be provided. However, it will be understood that the present disclosure is not limited thereto.

[0055] Each of the plurality of pixels PX may include one or more light emitting elements 350 that emit light of a specific wavelength band to express a color. The light emitted from the light emitting element 350 may be seen outside the display device 10 via the emission portion. In an exemplary embodiment, pixels PX that express different colors may include light emitting elements 350 that emit light of different colors. For example, a first pixel PX1 for expressing red may include a light emitting element 350 for emitting red light, a second pixel PX2 for expressing green may include a light emitting element 350 for emitting green light, and a third pixel PX3 for expressing blue may include a light emitting element 350 for emitting blue light. However, it will be understood that the present disclosure is not limited thereto. In some embodiments, pixels that express different colors may include a light emitting element 350 for emitting the same color (e.g., blue), and a wavelength conversion layer or a color filter may be located on the emission path to express the color of the pixel. However, it will be understood that the present disclosure is not limited thereto. In some embodiments, adjacent pixels PX may emit light of the same color.

[0056] Reference Figure 1 , the display device 10 may include a plurality of electrodes 310, 320, and 330 and a plurality of light emitting elements 350. At least some of the electrodes 310, 320, and 330 may be provided in each of the pixels PX and may be electrically connected to the light emitting element 350 to apply an electrical signal so that the light emitting element 350 may express a specific color.

[0057] In addition, at least some of the electrodes 310, 320, and 330 may be used to form an electric field within the pixel PX to align the light emitting elements 350. Specifically, when aligning the light emitting elements 350 emitting different colors in a plurality of pixels PX, it is necessary to accurately align the different light emitting elements 350 for each of the pixels PX. The light emitting elements 350 may be aligned using dielectrophoresis as follows: a solution containing the light emitting elements 350 is applied to the display device 10, and AC power is applied to the solution to form an electric field, and then a dielectrophoretic force is applied to the light emitting elements 350 to align them.

[0058] The plurality of electrodes 310, 320 and 330 may include a first electrode 310, a second electrode 320 and a third electrode (or referred to as a floating electrode) 330. In an exemplary embodiment, the first electrode 310 may be a pixel electrode disconnected for each pixel PX, and the second electrode 320 may be a common electrode connected throughout a plurality of pixels PX. The first electrode 310 may be an anode electrode of the light emitting element 350, and the second electrode 320 may be a cathode electrode of the light emitting element 350. However, it will be understood that the present disclosure is not limited thereto. That is, the first electrode 310 may be a cathode electrode of the light emitting element 350, and the second electrode 320 may be an anode electrode of the light emitting element 350.

[0059] The first and second electrodes 310 and 320 may include electrode trunks 310S and 320S respectively extending in a first direction D1 and one or more electrode branches 310B and 320B respectively branching from the electrode trunks 310S and 320S and extending in a second direction D2 crossing the first direction D1 .

[0060] Specifically, the first electrode 310 may include a first electrode trunk 310S extending in the first direction D1 and at least one first electrode branch 310B branching out from the first electrode trunk 310S and extending in the second direction D2. Although not shown in the drawings, one end of the first electrode trunk 310S may be connected to a signal application pad (pad, or "pad"), and the other end thereof may extend in the first direction D1 and be electrically disconnected from the first electrode trunk 310S of the adjacent pixel PX. The signal application pad may be connected to the display device 10 or an external power source to apply an electrical signal to the first electrode trunk 310S or apply AC power to align the light emitting element 350.

[0061] The first electrode trunk 310S of a pixel may be substantially in line with the first electrode trunk 310S of a pixel adjacent to the pixel in the same row (e.g., in the first direction D1). In other words, both ends of the first electrode trunk 310S of a pixel terminate between the pixel and an adjacent pixel PX and are separated therefrom, and the first electrode trunk 310S of an adjacent pixel may be in line with the first electrode trunk 310S of the pixel. The first electrode trunk 310S may be formed as a single trunk electrode during the manufacturing process, and then may be cut using a laser or the like after the light emitting element 350 is aligned. Therefore, the first electrode trunk 310S disposed in each of the pixels PX may apply different electrical signals to different first electrode branches 310B, so that the first electrode branches 310B may be driven individually.

[0062] The first electrode branch portion 310B may branch out from at least a portion of the first electrode trunk portion 310S to extend in the second direction D2, and may terminate while being spaced apart from the second electrode trunk portion 320S positioned opposite to the first electrode trunk portion 310S. That is, in the pixel PX, one end of the first electrode branch portion 310B may be connected to the first electrode trunk portion 310S, and the other end of the first electrode branch portion 310B may be spaced apart from the second electrode trunk portion 320S. Because the first electrode branch portion 310B is connected to the first electrode trunk portion 310S electrically separated from the first electrode trunk portion 310S of the adjacent pixel PX, different pixels PX may receive different electrical signals.

[0063] In addition, the first electrode branch portion 310B may be spaced apart from the second electrode branch portion 320B and the third electrode 330 to be described later. Figure 1 Only one first electrode branch 310B is shown in the figure, but more than one first electrode branch 310B may be provided. In such a case, some of the first electrode branch 310B may be electrically separated from the first electrode trunk 310S to form a third electrode 330 to be described later. A more detailed description thereof will be given below.

[0064] The second electrode 320 may include a second electrode trunk 320S and at least one second electrode branch 320B, the second electrode trunk 320S extending in the first direction D1 and spaced apart from the first electrode trunk 310S and positioned opposite to the first electrode trunk 310S, at least one second electrode branch 320B branching out from the second electrode trunk 320S and extending in the second direction D2 and spaced apart from the first electrode branch 310B and facing the first electrode branch 310B. Like the first electrode trunk 310S, the end of the second electrode trunk 320S may be connected to the signal application pad. It should be noted that the other end of the second electrode trunk 320S may extend across a plurality of pixels PX adjacent to each other in the first direction D1. That is, the second electrode trunk 320S may be electrically connected between the pixels PX. Therefore, the two ends of the second electrode trunk 320S in the pixel are connected to the ends of the adjacent pixels on both sides, so that the same electrical signal can be applied to the pixel.

[0065] The second electrode branch portion 320B may branch out from at least a portion of the second electrode trunk portion 320S to extend in the second direction D2, and may terminate while being spaced apart from the first electrode trunk portion 310S. That is, in the pixel PX, one end of the second electrode branch portion 320B may be connected to the second electrode trunk portion 320S, and the other end of the second electrode branch portion 320B may be spaced apart from the first electrode trunk portion 310S. Because the second electrode branch portion 320B is connected to the second electrode trunk portion 320S electrically connected to the second electrode trunk portion 320S of the adjacent pixel PX, different pixels PX may receive the same electrical signal.

[0066] In addition, the second electrode branch 320B may be spaced apart from the first electrode branch 310B and the third electrode 330. Because the first electrode trunk 310S and the second electrode trunk 320S are spaced apart from each other on opposite sides of the center of each pixel PX and are positioned opposite to each other, the first electrode branch 310B and the second electrode branch 320B may extend in opposite directions. In other words, the first electrode branch 310B may extend toward one side in the second direction D2 and the second electrode branch 320B may extend toward the opposite side in the second direction D2, so that they may be arranged on opposite sides relative to the center of the pixel PX. However, it will be understood that the present disclosure is not limited thereto. The first electrode trunk 310S and the second electrode trunk 320S may be arranged on the same side of the center of the pixel PX and may be spaced apart from each other. In such a case, the first electrode branch 310B and the second electrode branch 320B branched out from the electrode trunks 310S and 320S, respectively, may extend in the same direction.

[0067] Although in Figure 1 Only one second electrode branch 320B is shown in FIG. 1 , but more than one second electrode branch 320B may be provided. In this case, like the first electrode branch 310B, some of the second electrode branch 320B may be electrically separated from the second electrode trunk 320S to form a third electrode 330 to be described later.

[0068] At least one third electrode 330 may be disposed between the first electrode branch 310B and the second electrode branch 320B. The third electrode 330 may have substantially the same shape as the first electrode branch 310B or the second electrode branch 320B and face them. The third electrode 330 may extend in the second direction D2, and its two ends may be terminated so that they are spaced apart from the first electrode trunk 310S and the second electrode trunk 320S in the second direction D2. That is, the third electrode 330 may be electrically separated from the electrode trunks 310S and 320S. In an exemplary embodiment, the third electrode 330 may be a floating electrode to which no electrical signal is directly applied from the electrode trunks 310S and 320S. However, it will be understood that the present disclosure is not limited thereto.

[0069] The third electrode 330 may be equally spaced from the first electrode branch 310B and the second electrode branch 320B. That is, the third electrode 330 may have a constant width between the first electrode branch 310B and the second electrode branch 320B. The light-emitting element 350 described later is arranged between the first electrode branch 310B and the third electrode 330 and between the third electrode 330 and the second electrode branch 320B. The third electrode 330 may be spaced at a constant pitch so that the light-emitting element 350 may be connected to the first electrode branch 310B or the second electrode branch 320B and the third electrode 330. However, it will be understood that the present disclosure is not limited thereto. When the length of the third electrode 330 measured in the first direction D1 is long enough, the third electrode 330 may not be equally spaced from the first electrode branch 310B and the second electrode branch 320B.

[0070] In the drawings, one end of the third electrode 330 is aligned with one end of the first electrode branch 310B, and the other end of the third electrode 330 is aligned with one end of the second electrode branch 320B. For example, when a plurality of third electrodes 330 are provided, the third electrode 330 may be substantially aligned with the first electrode branch 310B and the second electrode branch 320B in the first direction D1. However, it will be understood that the present disclosure is not limited thereto. In some exemplary embodiments, at least one of the two ends of the third electrode 330 may protrude from the ends of the first electrode branch 310B and the second electrode branch 320B. In such a case, a plurality of third electrodes 330 may be arranged between the first electrode branch 310B and the second electrode branch 320B, and the two ends of some of the third electrodes 330 may not be aligned with the ends of the first electrode branch 310B and the second electrode branch 320B but may protrude from the ends.

[0071] Such a third electrode 330 may be formed separately from the first electrode branch 310B and the second electrode branch 320B, but the present disclosure is not limited thereto. In some exemplary embodiments, the third electrode 330 may be formed to be substantially the same as the first electrode branch 310B or the second electrode branch 320B, and then may be separated during a subsequent disconnection process so that they may be separated from the first electrode branch 310B and the second electrode branch 320B. Specifically, some of the third electrodes 330 may be electrically connected to the first electrode trunk 310S or the second electrode trunk 320S, and then may be disconnected by a laser or the like. A more detailed description thereof will be given below.

[0072] A plurality of light emitting elements 350 may be arranged between the first electrode branch 310B and the third electrode 330 and between the third electrode 330 and the second electrode branch 320B. Specifically, some of the plurality of light emitting elements 350 may have one end electrically connected to the first electrode branch 310B and the other end electrically connected to the side of the third electrode 330 facing the first electrode branch 310B. In addition, some of the plurality of light emitting elements 350 may have one end electrically connected to the other side of the third electrode 330 facing the second electrode branch 320B and the other end electrically connected to the second electrode branch 320B.

[0073] The contact electrode 360 ​​may be disposed on the first electrode branch 310B, the second electrode branch 320B, and the third electrode 330 connected to the light emitting element 350. The contact electrode 360 ​​may be in contact with the light emitting element 350 so that the light emitting element 350 may be electrically connected to the electrode branch 310B or 320B and the third electrode 330. The contact electrode 360 ​​may be in contact with at least the side portions on both ends of each of the light emitting elements 350. Therefore, each of the light emitting elements 350 may receive an electrical signal to emit light of a specific color.

[0074] In some exemplary embodiments, one end of each of the light-emitting elements 350 that partially contacts the first electrode branch 310B or the other side of the third electrode 330 that faces the second electrode branch 320B may be an n-type or p-type doped conductive material layer, and the other end of each of the light-emitting elements 350 that contacts the one side of the third electrode 330 that faces the first electrode branch 310B or the second electrode branch 320B may be a p-type or n-type doped conductive material layer. However, it will be understood that the present disclosure is not limited thereto.

[0075] A plurality of light emitting elements 350 may be arranged in parallel with each other. The light emitting elements 350 may be equally spaced apart from each other. However, it will be understood that the present disclosure is not limited thereto. In some embodiments, some of the light emitting elements 350 may be arranged close to each other to form a group, and some other light emitting elements 350 of the light emitting elements 350 may be arranged close to each other to form another group spaced apart from the group. Alternatively, the light emitting elements 350 may be arranged so that they are oriented in one direction to have a non-uniform density.

[0076] As described above, a plurality of light emitting elements 350 may be arranged between the first electrode branch 310B and the third electrode 330 and between the third electrode 330 and the second electrode branch 320B, so that the plurality of light emitting elements 350 may be electrically connected to each other. The distance between the first electrode branch 310B and the second electrode branch 320B may be greater than the length of the longer axis of the light emitting element 350, and the distance between the third electrode 330 and the first electrode branch 310B and the distance between the third electrode 330 and the second electrode branch 320B may be less than the length of the longer axis of the light emitting element 350. However, it will be understood that the present disclosure is not limited thereto.

[0077] The light-emitting element 350 disposed between the third electrode 330 and the first electrode branch 310B can be electrically connected in series to the light-emitting element 350 between the third electrode 330 and the second electrode branch 320B. The light-emitting elements 350 can be arranged in groups in the pixel PX so that they can form a series connection. Because the voltage applied to the light-emitting element 350 is larger when the light-emitting element 350 is connected in parallel, the voltage division efficiency can be improved. In addition, because the amount of current required to drive the light-emitting element 350 connected in series is reduced, the capacity of the driving transistor for applying current to the light-emitting element 350 can be reduced, and the power loss caused by the power supply line can be reduced. As a result, the voltage efficiency and the luminous efficiency can be improved when driving the display device 10.

[0078] like Figure 1 As shown in FIG. 1 , the first electrode trunk 310S and the second electrode trunk 320S may be electrically connected to the thin film transistor 120 or the power supply line 161 (eg, as shown in FIG. 1 ) to be described below through contact holes (eg, the first electrode contact hole CNTD and the second electrode contact hole CNTS), respectively. Figure 4 ). Although the contact hole on the first electrode trunk 310S and the second electrode trunk 320S is formed in each of the pixels PX, the present disclosure is not limited thereto. Since the second electrode trunk 320S can extend and be electrically connected to the adjacent pixel PX as described above, in some exemplary embodiments, the second electrode trunk 320S can be electrically connected to the thin film transistor through a single contact hole.

[0079] Figure 2 yes Figure 1 The equivalent circuit diagram of a single pixel of the display device. Figure 2 Although not shown in the figure, the display device 10 may include a plurality of pixels PX. As an example, Figure 2 The pixel PX(i, j) at the i-th row and j-th column is shown.

[0080] Reference Figure 2 , a pixel PX(i,j) of the display device 10 may include an i-th scan line SLi, a j-th data line DLj, a first switching element TR1, a second switching element TR2, a light emitting element 350, and a storage capacitor Cst.

[0081] The first switching element TR1 may be electrically connected to the i-th scan line SLi, the j-th data line DLj, and the second switching element TR2. In an exemplary embodiment, the first switching element TR1 and the second switching element TR2 may be three-terminal elements such as thin film transistors. In the following description, it is assumed that the first switching element TR1 and the second switching element TR2 are thin film transistors.

[0082] The first switching element TR1 may include a control electrode electrically connected to the i-th scan line SLi, an electrode electrically connected to the j-th data line DLj, and another electrode electrically connected to the control electrode of the second switching element TR2.

[0083] The second switching element TR2 may include a control electrode electrically connected to the other electrode of the first switching element TR1 , an electrode electrically connected to the first power supply line VDDL via which the first driving voltage VDD is applied, and another electrode electrically connected to the light emitting element 350 .

[0084] One electrode of the storage capacitor Cst may be electrically connected to the other electrode of the first switching element TR1 , and the other electrode of the storage capacitor Cst may be electrically connected to a first power supply line VDDL through which the first driving voltage VDD is supplied.

[0085] The first switching element TR1 may be turned on in response to the scan signal Si supplied from the i-th scan line SLi, and may provide the data signal Dj supplied from the j-th data line DLj to the storage capacitor Cst. The storage capacitor Cst may be charged with a voltage equal to the difference between the voltage of the received data signal Dj and the first driving voltage VDD. The second switching element TR2 may control the amount of driving current supplied to the light emitting element 350 according to the voltage charged in the storage capacitor Cst. That is, the first switching element TR1 may be a switching transistor, and the second switching element TR2 may be a driving transistor.

[0086] One end of the light emitting element 350 connected to the first electrode 310 may be electrically connected to the other electrode of the second switching element TR2. The light emitting element 350 may receive current through the other electrode of the second switching element TR2. The other end of the light emitting element 350 connected to the second electrode 320 may be electrically connected to the second power supply line VSSL so that the second supply voltage VSS may be applied. The level of the first driving voltage VDD may be higher than the level of the second supply voltage VSS.

[0087] like Figure 2 As shown in , the light emitting element 350 may be connected in series between the second switching element TR2 and the second power supply line VSSL through which the second supply voltage VSS is applied. Figure 2 As shown in, the number of light emitting elements 350 connected in series is not specifically limited. It will be understood that a greater number of light emitting elements 350 can be connected in series. Therefore, the first drive voltage VDD and the second supply voltage VSS for driving the light emitting element 350 can be more effectively divided among the light emitting elements 350. In addition, the current flowing through the second switching element TR2 decreases as the light emitting elements 350 are connected in series, so it is easier to design the capacity of the thin film transistor. Because the magnitude of the current is reduced, it is possible to reduce the power loss on the power supply line or the first power supply line VDDL and the second power supply line VSSL.

[0088] exist Figure 2 In the example shown in FIG. 1 , the display device 10 includes two switching elements (i.e., the first switching element TR1 and the second switching element TR2) and a single capacitor (i.e., the storage capacitor Cst). However, it will be understood that the present disclosure is not limited thereto. In some exemplary embodiments, the display device 10 may include a greater number of switching elements. Figure 3 An equivalent circuit diagram of a display device 10 according to another exemplary embodiment is described.

[0089] Figure 3 is an equivalent circuit diagram of a pixel of a display device according to another exemplary embodiment of the present disclosure. As an example, Figure 3 The pixel PX(i, j) at the i-th row and j-th column is shown.

[0090] Reference Figure 3 , a pixel PX(i,j) of the display device 10 may include an i-th scan line SLi, an i-1-th scan line SLi-1, a j-th data line DLj, an i-th emission control line Ei, first to seventh switching elements TR1 to TR7, a light emitting element 350 and a storage capacitor Cst.

[0091] One end of the light emitting element 350 connected to the first electrode 310 may be electrically connected to one electrode of the fifth switching element TR5 and one electrode of the seventh switching element TR7. The light emitting element 350 may receive current through the electrode of the fifth switching element TR5 and the electrode of the seventh switching element TR7. The other end of the light emitting element 350 connected to the second electrode 320 may be electrically connected to the second power supply line VSSL so that the second supply voltage VSS may be applied.

[0092] One electrode of the first switching element TR1 is electrically connected to the first node N1, and the other electrode of the first switching element TR1 is electrically connected to the second node N2. The gate electrode of the first switching element TR1 is electrically connected to one end of the storage capacitor Cst through the third node N3. The first switching element TR1 is electrically connected to one end of the light emitting element 350 via the fifth switching element TR5. The first switching element TR1 can receive the data signal of the j-th data line DLj and supply current to the light emitting element 350 according to the switching operation of the second switching element TR2.

[0093] One electrode of the second switching element TR2 is electrically connected to the j-th data line DLj, and the other electrode of the second switching element TR2 is electrically connected to the first node N1. The gate electrode of the second switching element TR2 is electrically connected to the i-th scan line SLi. The other electrode of the second switching element TR2 is electrically connected to the first node N1, and the first node N1 is electrically connected to the first power supply line VDDL through the fourth switching element TR4. The second switching element may be turned on in response to a scan signal on the i-th scan line SLi, and may perform a switching operation to transmit a data signal transmitted to the j-th data line DLj to the first switching element TR1.

[0094] One electrode of the third switching element TR3 is electrically connected to the second node N2, and the other electrode of the third switching element TR3 is electrically connected to the third node N3. A gate electrode of the third switching element TR3 is electrically connected to the i-th scan line SLi. When a scan signal is applied to the i-th scan line SLi, the third switching element TR3 is turned on and the first switching element TR1 is diode-connected.

[0095] One electrode of the fourth switching element TR4 is electrically connected to the first power supply line VDDL to receive the first driving voltage VDD, the other electrode of the fourth switching element TR4 is electrically connected to the first node N1, and a gate electrode of the fourth switching element TR4 is electrically connected to the i-th emission control line Ei.

[0096] One electrode of the fifth switching element TR5 is electrically connected to the second node N2, and the other electrode of the fifth switching element TR5 is electrically connected to one end of the light emitting element 350. The gate electrode of the fifth switching element TR5 is electrically connected to the i-th emission control line Ei. The fourth switching element TR4 and the fifth switching element TR5 are simultaneously turned on according to the emission control signal transmitted via the i-th emission control line Ei, so that the first driving voltage VDD is applied to the light emitting element 350, thereby allowing the driving current to flow through the light emitting element 350.

[0097] One electrode of the sixth switching element TR6 is electrically connected to the third node N3, and the other electrode of the sixth switching element TR6 is supplied with the initialization voltage Vinit. The gate electrode of the sixth switching element TR6 is electrically connected to the i-1th scan line SLi-1. Since the scan signal is sequentially supplied to the scan lines SLi-1 and SLi, the scan signal may be supplied to the i-1th scan line SLi-1 and then to the i-th scan line SLi. The sixth switching element TR6 is turned on in response to the scan signal transmitted via the i-1th scan line SLi-1 to transmit the initialization voltage Vinit to the gate electrode of the first switching element TR1, thereby initializing the voltage of the gate electrode of the first switching element TR1.

[0098] One electrode of the seventh switching element TR7 is electrically connected to one end of the light emitting element 350, and the other electrode of the seventh switching element TR7 is supplied with the initialization voltage Vinit. The gate electrode of the seventh switching element TR7 is electrically connected to the i-1th scan line SLi-1. The seventh switching element TR7 can be turned on in response to the scan signal to initialize one end of the light emitting element 350.

[0099] The first to seventh switching elements TR1 to TR7 may be thin film transistors. In each of the first to seventh switching elements TR1 to TR7, one electrode may be a source electrode or a drain electrode, and the other electrode may be a drain electrode or a source electrode.

[0100] One end of the storage capacitor Cst may be electrically connected to the first power supply line VDDL to receive the first driving voltage VDD, and the other end may be electrically connected to the third node N3.

[0101] In the following, reference will be made to Figure 4 Various elements provided in the display device 10 are described in more detail.

[0102] Figure 4 It is along Figure 1 A cross-sectional view taken along line II' of FIG. Figure 4 Only one pixel PX is shown, but it will be appreciated that the description is equally applicable to the other pixels as well.

[0103] Reference Figure 1 and Figure 4 , the display device 10 may include a substrate 110, thin film transistors 120 and 140 disposed on the substrate 110, electrodes 310, 320 and 330 disposed above the thin film transistors 120 and 140, and a light emitting element 350. The thin film transistor may include a first thin film transistor 120 and a second thin film transistor 140, and the first thin film transistor 120 and the second thin film transistor 140 may be a driving transistor and a switching transistor, respectively. Each of the thin film transistors 120 and 140 may have an active layer, a gate electrode, a source electrode, and a drain electrode. The first electrode 310 may be electrically connected to the drain electrode of the first thin film transistor 120.

[0104] More specifically, the substrate 110 may be an insulating substrate. The substrate 110 may be made of an insulating material such as glass, quartz or a polymer resin. Examples of polymer materials may include polyethersulfone (PES), polyacrylate (PA), polyetherimide (PEI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyallylate, polyimide (PI), polycarbonate (PC), cellulose triacetate (CAT), cellulose acetate propionate (CAP) or a combination thereof. The substrate 110 may be a rigid substrate or a flexible substrate that may be bent, folded or curled.

[0105] The buffer layer 115 may be disposed on the substrate 110. The buffer layer 115 may prevent diffusion of impurity ions, may prevent penetration of moisture or external air, and may provide a flat surface. The buffer layer 115 may include silicon nitride, silicon oxide, silicon oxynitride, or the like.

[0106] The semiconductor layer is disposed on the buffer layer 115. The semiconductor layer may include a first active layer 126 of the first thin film transistor 120, a second active layer 146 of the second thin film transistor 140, and an auxiliary layer 163. The semiconductor layer may include polycrystalline silicon, single crystal silicon, oxide semiconductor, or the like.

[0107] The first gate insulating layer 170 is disposed on the semiconductor layer. The first gate insulating layer 170 covers the semiconductor layer. The first gate insulating layer 170 may be used as a gate insulating layer of a thin film transistor. The first gate insulating layer 170 may include silicon oxide, silicon nitride, silicon oxynitride, aluminum oxide, tantalum oxide, hafnium oxide, zirconium oxide, titanium oxide, etc. They may be used alone or in combination.

[0108] The first conductive layer is disposed on the first gate insulating layer 170. The first conductive layer may include a first gate electrode 121, a second gate electrode 141, and a power supply line 161, which are respectively disposed on the first active layer 126 of the first thin film transistor 120, the second active layer 146 of the second thin film transistor 140, and the auxiliary layer 163, with the first gate insulating layer 170 located therebetween. The first conductive layer may include at least one metal selected from the group consisting of molybdenum (Mo), aluminum (Al), platinum (Pt), palladium (Pd), silver (Ag), magnesium (Mg), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), calcium (Ca), titanium (Ti), tantalum (Ta), tungsten (W), and copper (Cu). The first conductive layer may be composed of a single layer or a plurality of layers.

[0109] The second gate insulating layer 180 is disposed on the first conductive layer. The second gate insulating layer 180 may be an interlayer dielectric layer. The second gate insulating layer 180 may be made of an inorganic insulating material such as silicon oxide, silicon nitride, silicon oxynitride, hafnium oxide, aluminum oxide, titanium oxide, tantalum oxide, or zinc oxide.

[0110] The second conductive layer is disposed on the second gate insulating layer 180. The second conductive layer includes a capacitor electrode 128 disposed over the first gate electrode 121 with the second gate insulating layer 180 therebetween. The capacitor electrode 128 may form a storage capacitor with the first gate electrode 121.

[0111] As with the first conductive layer described above, the second conductive layer may include at least one metal selected from the group consisting of molybdenum (Mo), aluminum (Al), platinum (Pt), palladium (Pd), silver (Ag), magnesium (Mg), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), calcium (Ca), titanium (Ti), tantalum (Ta), tungsten (W) and copper (Cu).

[0112] The interlayer dielectric layer 190 is disposed on the second conductive layer. The interlayer dielectric layer 190 may be an interlayer dielectric film. The interlayer dielectric layer 190 may also provide a flat surface. The interlayer dielectric layer 190 may include an organic insulating material such as polyacrylate resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, unsaturated polyester resin, polyphenylene oxide resin, polyphenylene sulfide resin, and benzocyclobutene (BCB).

[0113] The third conductive layer is disposed on the interlayer dielectric layer 190 , and includes the first drain electrode 123 and the first source electrode 124 of the first thin film transistor 120 , the second drain electrode 143 and the second source electrode 144 of the second thin film transistor 140 , and the power supply electrode 162 disposed on the power supply line 161 .

[0114] The first source electrode 124 and the first drain electrode 123 may be electrically connected to the first active layer 126 through a first contact hole 129 penetrating the interlayer dielectric layer 190, the second gate insulating layer 180, and the first gate insulating layer 170, respectively. The second source electrode 144 and the second drain electrode 143 may be electrically connected to the second active layer 146 through a second contact hole 149 penetrating the interlayer dielectric layer 190, the second gate insulating layer 180, and the first gate insulating layer 170, respectively. The power supply electrode 162 may be electrically connected to the power supply line 161 through a third contact hole 169 penetrating the interlayer dielectric layer 190 and the second gate insulating layer 180.

[0115] The third conductive layer may include at least one metal selected from the group consisting of aluminum (Al), molybdenum (Mo), platinum (Pt), palladium (Pd), silver (Ag), magnesium (Mg), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), calcium (Ca), titanium (Ti), tantalum (Ta), tungsten (W) and copper (Cu). The third conductive layer may be composed of a single film or a plurality of films. For example, the third conductive layer may have a stacked structure of Ti / Al / Ti, Mo / Al / Mo, Mo / AlGe / Mo and Ti / Cu.

[0116] The insulating base layer 300 is disposed on the third conductive layer. The insulating base layer 300 may be made of an organic insulating material such as polyacrylate resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, unsaturated polyester resin, polyphenylene oxide resin, polyphenylene sulfide resin, and benzocyclobutene (BCB). The surface of the insulating base layer 300 may be flat.

[0117] A plurality of pixel defining layers 410, 420, and 430 may be disposed on the insulating substrate layer 300. The pixel defining layers 410, 420, and 430 may be disposed in each of the pixels PX and may be spaced apart from each other. The first electrode 310, the second electrode 320, and the third electrode 330 may be disposed on the first pixel defining layer 410, the second pixel defining layer 420, and the third pixel defining layer 430, respectively. Figure 1 and Figure 4 In the example shown in , three pixel defining layers 410 , 420 , and 430 are provided in one pixel PX, and the first electrode 310 , the second electrode 320 , and the third electrode 330 are arranged.

[0118] However, it will be understood that the present disclosure is not limited thereto. A greater number of pixel defining layers 410, 420, and 430 may be provided in one pixel PX. For example, when a greater number of third electrodes 330 are provided between the first electrode 310 and the second electrode 320, the pixel PX may have a greater number of pixel defining layers. The pixel defining layers 410, 420, and 430 may include at least one first pixel defining layer 410 on which the first electrode 310 is provided, at least one second pixel defining layer 420 on which the second electrode 320 is provided, and at least one third pixel defining layer 430 on which the third electrode 330 is provided. In such a case, the first pixel defining layer 410 and the second pixel defining layer 420 may be spaced apart from each other, and a plurality of third pixel defining layers 430 may be provided between them. For another example, the first pixel defining layer 410, the second pixel defining layer 420, and the third pixel defining layer 430 may be alternately arranged in one direction. In some exemplary embodiments, two first pixel defining layers 410 may be disposed to be separated from each other, one second pixel defining layer 420 may be disposed between the first pixel defining layers 410 , and at least one third pixel defining layer 430 may be disposed between each of the first pixel defining layers 410 and the second pixel defining layer 420 .

[0119] The plurality of pixel defining layers 410, 420, and 430 may be made of substantially the same material via a single process. In this case, the pixel defining layers 410, 420, and 430 may form a single grid pattern. The pixel defining layers 410, 420, and 430 may include polyimide (PI).

[0120] Although not shown in the drawings, at least some of the plurality of pixel defining layers 410, 420, and 430 may be disposed at the boundaries between the pixels PX so as to be distinguished from each other. Such pixel defining layers may also be disposed in a substantially grid pattern together with the first pixel defining layer 410, the second pixel defining layer 420, and the third pixel defining layer 430 described above. At least some of the pixel defining layers 410, 420, and 430 disposed at the boundaries between the pixels PX may be formed to cover the electrode lines of the display device 10.

[0121] Reflective layers 311 , 321 , and 331 may be disposed on the pixel defining layers 410 , 420 , and 430 .

[0122] The first reflective layer 311 covers the first pixel defining layer 410 and is electrically connected to the first drain electrode 123 of the first thin film transistor 120 through the fourth contact hole 319_1 penetrating the insulating base layer 300. The second reflective layer 321 covers the second pixel defining layer 420 and is electrically connected to the power supply electrode 162 through the fifth contact hole 319_2 penetrating the insulating base layer 300. The third reflective layer 331 covers the third pixel defining layer 430, and both ends thereof are spaced apart from the first reflective layer 311 and the second reflective layer 321. Unlike the first reflective layer 311 and the second reflective layer 321, the third reflective layer 331 is not connected to any thin film transistor through a contact hole.

[0123] The first reflective layer 311 may be electrically connected to the first drain electrode 123 of the first thin film transistor 120 through the fourth contact hole 319_1 in the pixel PX. Therefore, the first thin film transistor 120 may be disposed in a region overlapping the pixel PX. Figure 1 In the example shown in FIG. 3 , the first reflective layer 311 is electrically connected to the first thin film transistor 120 through the first electrode contact hole CNTD formed on the first electrode trunk portion 310S. That is, the first electrode contact hole CNTD may be the fourth contact hole 319_1.

[0124] The second reflective layer 321 may also be electrically connected to the power supply electrode 162 through the fifth contact hole 319_2 in the pixel PX. Figure 4 In the embodiment, the second reflective layer 321 is connected in one pixel PX through the fifth contact hole 319_2. Figure 1 It is shown that the second electrode 320 of each pixel PX is electrically connected to the power supply line 161 through a plurality of second electrode contact holes CNTS on the second electrode trunk 320S. That is, the second electrode contact hole CNTS may be the fifth contact hole 319_2. However, it will be understood that the present disclosure is not limited thereto. For example, in Figure 1 In some exemplary embodiments, the second electrode contact hole CNTS may be formed at various positions on the second electrode trunk portion 320S, and in some embodiments, the second electrode contact hole CNTS may be located on the second electrode branch portion 320B. In addition, in some exemplary embodiments, the second reflective layer 321 may be connected to one second electrode contact hole CNTS or the fifth contact hole 319_2 in a region other than one pixel PX.

[0125] Figure 5 is a plan view of a display device according to another exemplary embodiment of the present disclosure. Figure 6 It is along Figure 5 Cross-sectional views taken along lines II-II' and III-III'.

[0126] There may be a non-emission region where the light emitting element 350 is not disposed, for example, in a region other than an emission portion where the pixel PX of the display device 10 is disposed (for example, on the outside of the pixel PX). As described above, the second electrode 320 of each pixel PX may be electrically connected to each other through the second electrode trunk 320S to receive the same electrical signal.

[0127] Reference Figure 5 and Figure 6 In some exemplary embodiments, the second electrode trunk portion 320S of the second electrode 320 may be electrically connected to the power supply electrode 162 through a second electrode contact hole CNTS located in a non-emission region on an outer portion of the display device 10. Figure 1 Unlike the display device 10 shown in FIG. 1 , even if the second electrode trunk 320S is connected to the power supply electrode 162 through one contact hole, the second electrode trunk 320S extends to and is electrically connected to the adjacent pixel PX, so that the same electrical signal can be applied to the second electrode branch 320B of each pixel PX. For the second electrode 320 of the display device 10, the position of the contact hole for receiving the electrical signal from the power supply electrode 162 may be changed according to the structure of the display device 10. However, this is merely illustrative.

[0128] Return to reference Figure 1 and Figure 4 , the reflective layers 311, 321, and 331 may include a material having a high reflectivity to reflect light emitted from the light emitting element 350. For example, the reflective layers 311, 321, and 331 may include, but are not limited to, materials such as silver (Ag) and copper (Cu).

[0129] At least a portion of the plurality of pixel defining layers 410, 420, and 430 may protrude from the insulating base layer 300. The pixel defining layers 410, 420, and 430 may protrude upward from the plane on which the light emitting element 350 is disposed, and at least a portion of the protruding portion may have an inclination. The pixel defining layers 410, 420, and 430 protruding at an inclination may reflect light incident on the reflective layers 311, 321, and 331 disposed thereon. Light directed from the light emitting element 350 to the reflective layers 311, 321, and 331 may be reflected off the reflective layers 311, 321, and 331 and transmitted toward the outside of the display device 10 (e.g., above the pixel defining layers 410, 420, and 430).

[0130] The first electrode layer 312 , the second electrode layer 322 , and the third electrode layer 332 may be disposed on the first reflective layer 311 , the second reflective layer 321 , and the third reflective layer 331 , respectively.

[0131] The first electrode layer 312 is directly disposed on the first reflective layer 311. The first electrode layer 312 may have substantially the same pattern as the first reflective layer 311. The second electrode layer 322 is directly disposed on the second reflective layer 321. The second electrode layer 322 may have substantially the same pattern as the second reflective layer 321. The third electrode layer 332 is directly disposed on the third reflective layer 331 and is spaced apart from the first electrode layer 312 and the second electrode layer 322. The third electrode layer 332 may have substantially the same pattern as the third reflective layer 331.

[0132] In an exemplary embodiment, the electrode layers 312, 322, and 332 may respectively cover the reflective layers 311, 321, and 331 thereunder. That is, the electrode layers 312, 322, and 332 may be larger than the reflective layers 311, 321, and 331 to cover the side surfaces of the ends of the reflective layers 311, 321, and 331. However, it will be understood that the present disclosure is not limited thereto.

[0133] The first electrode layer 312 and the second electrode layer 322 may transmit electrical signals to the first reflective layer 311 and the second reflective layer 321 connected to the first thin film transistor 120 and the power supply electrode 162, respectively, to the contact electrode to be described below. The electrode layers 312, 322, and 332 may include a transparent conductive material. For example, the electrode layers 312, 322, and 332 may include, but are not limited to, materials such as indium tin oxide (ITO), indium zinc oxide (IZO), and indium tin zinc oxide (ITZO). In some exemplary embodiments, each of the reflective layers 311, 321, and 331 and the electrode layers 312, 322, and 332 may have a structure in which at least one transparent conductive layer such as ITO, IZO, and ITZO and at least one metal layer such as silver and copper are stacked on each other. For example, the reflective layers 311, 321, and 331 and the electrode layers 312, 322, and 332 may form a stacked structure of ITO / silver (Ag) / ITO.

[0134] The first reflective layer 311 and the first electrode layer 312 disposed on the first pixel defining layer 410 form the first electrode 310. The first electrode 310 may protrude to the region extending from both ends of the first pixel defining layer 410, so that the first electrode 310 may contact the insulating base layer 300. The second reflective layer 321 and the second electrode layer 322 disposed on the second pixel defining layer 420 form the second electrode 320. The second electrode 320 may protrude to the region extending from both ends of the second pixel defining layer 420, so that the second electrode 320 may contact the insulating base layer 300. The third reflective layer 331 and the third electrode layer 332 disposed on the third pixel defining layer 430 form the third electrode 330. The third electrode 330 may protrude to the region extending from both ends of the third pixel defining layer 430, so that the third electrode 330 may contact the insulating base layer 300.

[0135] The first electrode 310, the second electrode 320, and the third electrode 330 are arranged to cover the entire area of ​​the first pixel defining layer 410, the second pixel defining layer 420, and the third pixel defining layer 430. As described above, the first electrode 310 may be spaced apart from and face the third electrode 330, and the third electrode 330 may be spaced apart from and face the second electrode 320. A first insulating layer 381, which will be described in detail below, may be provided between the electrodes spaced apart from each other, and the light emitting element 350 may be provided on the first insulating layer 381.

[0136] Since the first reflective layer 311 can receive a driving voltage from the first thin film transistor 120, and the second reflective layer 321 can receive a supply voltage from the power supply line 161, the first electrode 310 and the second electrode 320 receive a driving voltage and a supply voltage, respectively. As will be described below, the first electrode 310 can be electrically connected to the first thin film transistor 120, and the second electrode 320 can be electrically connected to the power supply line 161. Therefore, the first contact electrode 361 and the second contact electrode 362 respectively disposed on the first electrode 310 and the second electrode 320 can receive a driving voltage and a supply voltage. The third electrode 330 disposed between the first electrode 310 and the second electrode 320 can transmit the driving voltage and the supply voltage to the light emitting element 350 through the third contact electrode 363 disposed on the third electrode 330, so that current flows in the light emitting element 350 to emit light.

[0137] The first insulating layer 381 is disposed on a portion of the first electrode 310, the second electrode 320, and the third electrode 330. The first insulating layer 381 may be disposed in a space between the first electrode 310 and the third electrode 330 and between the third electrode 330 and the second electrode 320. When viewed from the top, the first insulating layer 381 may have an island shape or a linear shape formed along a space between the first electrode branch portion 310B, the second electrode branch portion 320B, and the third electrode 330.

[0138] The light emitting element 350 is disposed on the first insulating layer 381. The first insulating layer 381 may be disposed between the light emitting element 350 and the insulating base layer 300. The lower surface of the first insulating layer 381 may be in contact with the insulating base layer 300, and the light emitting element 350 may be disposed on the upper surface of the first insulating layer 381. The first insulating layer 381 is in contact with the electrodes 310, 320, and 330 on both sides and may electrically insulate them from each other.

[0139] The first insulating layer 381 may overlap with a portion of each of the electrodes 310, 320, and 330 (for example, a region protruding in a direction in which the first electrode 310 and the third electrode 330 face each other and a region protruding in a direction in which the third electrode 330 and the second electrode 320 face each other). In addition, the first insulating layer 381 may be disposed on the inclined side surfaces of the pixel defining layers 410, 420, and 430 in the region on the electrodes 310, 320, and 330. Therefore, the lower surface of the first insulating layer 381 may contact the insulating base layer 300 and the electrodes 310, 320, and 330. At least one side portion of the first insulating layer 381 may also contact each of the electrodes 310, 320, and 330. The portion of the upper surface of the electrodes 310, 320, and 330 that is not provided with the first insulating layer 381 may be exposed. In addition, the first insulating layer 381 may be disposed so that both sides of the light emitting element 350 are exposed. Therefore, contact electrodes 361 , 362 , and 363 described below may make contact with the exposed upper surfaces of the electrodes 310 , 320 , and 330 and both sides of the light emitting element 350 .

[0140] For example, the first insulating layer 381 may cover the upper surface of the region where the first electrode 310 faces the third electrode 330 and the region where the third electrode 330 faces the second electrode 320. The first insulating layer 381 protects the regions overlapping the electrodes 310, 320, and 330 and electrically insulates them from each other. In addition, the first insulating layer 381 prevents the first conductive type semiconductor layer 351 and the second conductive type semiconductor layer 352 of the light emitting element 350 from contacting other substrates, thereby preventing damage to the light emitting element 350.

[0141] At least one light emitting element 350 may be provided between the first electrode 310 and the third electrode 330 and between the third electrode 330 and the second electrode 320. Thus, a plurality of light emitting elements 350 may be connected in series. Figure 1 An example is shown in which only the light emitting elements 350 emitting light of the same color are provided in each pixel PX. It will be understood that, as mentioned before, the light emitting elements 350 for emitting light of different colors may be provided in one pixel PX.

[0142] As described above, the distance between the first electrode 310 and the third electrode 330 and the distance between the third electrode 330 and the second electrode 320 may be less than or equal to the length of the light emitting element 350. Therefore, electrical contact between the light emitting element 350 and each of the first electrode 310, the second electrode 320, and the third electrode 330 may be easily and reliably achieved.

[0143] The light emitting element 350 may be a light emitting diode. The light emitting element 350 may be a nanostructure generally having a nanoscale size. The light emitting element 350 may be an inorganic light emitting diode made of an inorganic material. When the light emitting element 350 is an inorganic light emitting diode, the inorganic light emitting diode may be aligned between two electrodes having polarity by disposing a light emitting material having an inorganic crystal structure between two opposing electrodes and applying an electric field in a direction across the light emitting material.

[0144] Reference Figure 4 , in some exemplary embodiments, the light emitting element 350 may include a first conductive semiconductor layer 351, an active material layer 353, a second conductive semiconductor layer 352, and an electrode material layer 357, which will be described in detail below. The light emitting element 350 may be formed by stacking a first conductive semiconductor layer 351, an active material layer 353, a second conductive semiconductor layer 352, and an electrode material layer 357 in parallel with the insulating base layer 300. In other words, the light emitting element 350 in which a plurality of layers are stacked may be arranged in a horizontal direction in parallel with the insulating base layer 300. However, it will be understood that the present disclosure is not limited thereto. The layers of the light emitting element 350 may be stacked in reverse order with respect to each other.

[0145] In an exemplary embodiment, the first conductive semiconductor layer 351 of the light emitting element 350 may be electrically connected to one side of the first electrode 310 or the side of the third electrode 330 facing the second electrode 320, and the second conductive semiconductor layer 352 or the electrode material layer 357 of the light emitting element 350 may be electrically connected to the other side of the third electrode 330 or the second electrode 320. The configuration of the light emitting element 350 will be described in more detail later.

[0146] The second insulating layer 382 may be disposed on the light emitting element 350 to protect the light emitting element 350 and fix it between the electrodes 310, 320 and 330. Figure 4 382 is not shown, but the second insulating layer 382 may be provided on the outer surface of the light emitting element 350 to fix them. The second insulating layer 382 may be provided on a portion of the outer surface of the light emitting element 350 so that the two side surfaces of the light emitting element 350 are exposed. Specifically, the length of the second insulating layer 382 is smaller than the length of the light emitting element 350, so that the second insulating layer 382 can be recessed inward from both sides of the light emitting element 350. Therefore, the side surfaces of the first insulating layer 381, the light emitting element 350 and the second insulating layer 382 may have a stepped shape. In this case, the second insulating layer 382 is provided like the first insulating layer 381, so that the contact electrodes 361, 362 and 363 can be easily and reliably contacted with the side surfaces of the light emitting element 350. However, it will be understood that the present disclosure is not limited thereto. The length of the second insulating layer 382 may be equal to the length of the light emitting element 350, and the two sides may be aligned with each other.

[0147] A first contact electrode 361, a second contact electrode 362 and a third contact electrode 363 may be disposed on the second insulating layer 382, ​​the first contact electrode 361 being disposed on the first electrode 310 and overlapping with at least a portion of the second insulating layer 382, ​​the second contact electrode 362 being disposed on the second electrode 320 and overlapping with at least a portion of the second insulating layer 382, ​​and the third contact electrode 363 being disposed on the third electrode 330 and spaced apart from the first contact electrode 361 and the second contact electrode 362.

[0148] The first contact electrode 361 and the second contact electrode 362 may be disposed on the upper surfaces of the first electrode 310 and the second electrode 320, respectively. Specifically, the first contact electrode 361 and the second contact electrode 362 may be disposed on the upper surfaces of the first electrode 310 and the second electrode 320 to contact the first electrode layer 312 and the second electrode layer 322, respectively. The first contact electrode 361 and the second contact electrode 362 may contact the first conductive type semiconductor layer 351 and the second conductive type semiconductor layer 352 of the light emitting element 350, respectively. Therefore, the first contact electrode 361 and the second contact electrode 362 may transmit the electrical signal applied to the first electrode layer 312 and the second electrode layer 322 to the light emitting element 350.

[0149] The first contact electrode 361 may be disposed on the first electrode 310 and partially cover the first electrode 310. The lower surface of the first contact electrode 361 may be in contact with a portion of each of the light emitting element 350, the first insulating layer 381, and the second insulating layer 382. An end of the first contact electrode 361 closer to the third electrode 330 is disposed on the second insulating layer 382. The second contact electrode 362 may be disposed on the second electrode 320 and partially cover the second electrode 320. The lower surface of the second contact electrode 362 may be in contact with a portion of each of the light emitting element 350, the first insulating layer 381, and the second insulating layer 382. An end of the second contact electrode 362 closer to the third electrode 330 is disposed on the second insulating layer 382.

[0150] like Figure 1 As shown in , neither the first contact electrode 361 nor the second contact electrode 362 is disposed on the first electrode contact hole CNTD formed in the first electrode trunk 310S and the second electrode contact hole CNTS formed in the second electrode trunk 320S. That is, the first contact electrode 361 and the second contact electrode 362 may not overlap with the first electrode contact hole CNTD and the second electrode contact hole CNTS, respectively. However, it will be understood that the present disclosure is not limited to this. In some embodiments, a portion of each of the first contact electrode 361 and the second contact electrode 362 may be disposed on the first electrode 310 and the second electrode 320 so that they overlap with the first electrode contact hole CNTD and the second electrode contact hole CNTS, respectively.

[0151] The third contact electrode 363 may be disposed on the third electrode 330 and partially cover the third electrode 330. A lower surface of the third contact electrode 363 may contact a portion of each of the light emitting element 350, the first insulating layer 381, the second insulating layer 382, ​​and the third insulating layer 383. Both ends of the third contact electrode 363, which are respectively closer to the first electrode 310 and the second electrode 320, are disposed on the third insulating layer 383.

[0152] The first contact electrode 361 and the second contact electrode 362 may be separated from the third contact electrode 363 on the second insulating layer 382 or the third insulating layer 383. Specifically, the first contact electrode 361, the second contact electrode 362, and the third contact electrode 363 are in contact with the second insulating layer 382 or the third insulating layer 383 together with the light emitting element 350, but are spaced apart from each other in the stacking direction and are not connected to each other on the second insulating layer 382. Therefore, the first contact electrode 361 and the second contact electrode 362 may receive different power from the first thin film transistor 120 and the power supply line 161. For example, the first contact electrode 361 may receive a driving voltage applied to the first electrode 310 from the first thin film transistor 120, and the second contact electrode 362 may receive a supply voltage applied to the second electrode 320 from the power supply line 161. However, it will be understood that the present disclosure is not limited thereto.

[0153] The contact electrodes 361, 362, and 363 may include a conductive material. For example, the contact electrodes may include ITO, IZO, ITZO, aluminum (Al), etc. However, it will be understood that the present disclosure is not limited thereto.

[0154] In addition, the contact electrodes 361, 362, and 363 may include the same material as the electrode layers 312, 322, and 332. The contact electrodes 361, 362, and 363 may be arranged on the electrode layers 312, 322, and 332 in substantially the same pattern as the electrode layers 312, 322, and 332 so as to contact the electrode layers 312, 322, and 332. For example, the first contact electrode 361 and the second contact electrode 362 respectively contacting the first electrode layer 312 and the second electrode layer 322 receive an electrical signal applied to the first electrode layer 312 and the second electrode layer 322 to transmit the electrical signal to the light emitting element 350.

[0155] The third insulating layer 383 may be disposed on the first contact electrode 361 and the second contact electrode 362 so that the first contact electrode 361 and the second contact electrode 362 are electrically insulated from the third contact electrode 363. The third insulating layer 383 is disposed to cover the first contact electrode 361 and the second contact electrode 362, but does not overlap a portion of the light emitting element 350 so that the light emitting element 350 can contact the third contact electrode 363. The third insulating layer 383 may partially contact the first contact electrode 361, the second contact electrode 362, and the second insulating layer 382 on the upper surface of the second insulating layer 382. The third insulating layer 383 may be disposed on the upper surface of the second insulating layer 382 so that it covers one end of the first contact electrode 361 and the second contact electrode 362. Therefore, the third insulating layer 383 may protect the first contact electrode 361 and the second contact electrode 362 and electrically insulate them from the third contact electrode 363.

[0156] An end of the third insulating layer 383 closer to the third electrode 330 may be aligned with one side of the second insulating layer 382 .

[0157] In some exemplary embodiments, the third insulating layer 383 may be eliminated from the display device 10. Then, the first contact electrode 361, the second contact electrode 362, and the third contact electrode 363 may be disposed on substantially the same plane, and the first contact electrode 361, the second contact electrode 362, and the third contact electrode 363 may be electrically insulated from each other by the passivation layer 385, which will be described later. A more detailed description thereof will be given with reference to other exemplary embodiments.

[0158] A passivation layer 385 may be formed on the third insulating layer 383 and the third contact electrode 363 to protect the elements disposed on the insulating base layer 300 from the external environment. If the first contact electrode 361, the second contact electrode 362, and the third contact electrode 363 are exposed, the electrodes may be damaged, and thus a disconnection problem may occur. In order to prevent this, a passivation layer 385 is provided to cover them. That is, the passivation layer 385 may be provided to cover the first electrode 310, the second electrode 320, the third electrode 330, the light emitting element 350, and the like. If the third insulating layer 383 is eliminated as described above, the passivation layer 385 may be formed on the first contact electrode 361, the second contact electrode 362, and the third contact electrode 363. In this case, the passivation layer 385 may electrically insulate the first contact electrode 361, the second contact electrode 362, and the third contact electrode 363 from each other.

[0159] Each of the first insulating layer 381, the second insulating layer 382, ​​the third insulating layer 383, and the passivation layer 385 may include an inorganic insulating material. For example, the first insulating layer 381, the second insulating layer 382, ​​the third insulating layer 383, and the passivation layer 385 may include an inorganic insulating material such as silicon oxide (SiO x ), silicon nitride (SiN x ), silicon oxynitride (SiO x N y ), aluminum oxide (Al 2 O 3 ) and aluminum nitride (AlN). The first insulating layer 381, the second insulating layer 382, ​​the third insulating layer 383 and the passivation layer 385 may be formed of the same material or different materials. In addition, each of the first insulating layer 381, the second insulating layer 382, ​​the third insulating layer 383 and the passivation layer 385 may be made of any of various materials having insulating properties.

[0160] The light emitting element 350 may be formed on a substrate by epitaxial technology. It may be grown by forming a seed layer for forming a semiconductor layer on a substrate and then depositing a desired semiconductor material. Figures 7 to 9 The structure of the light emitting element 350 according to various exemplary embodiments is described in detail.

[0161] Figure 7 is a diagram illustrating a light emitting element according to an exemplary embodiment of the present disclosure.

[0162] Reference Figure 7 The light emitting element 350 may include a plurality of semiconductor layers 351 and 352, an active material layer 353 disposed between the plurality of semiconductor layers 351 and 352, an electrode material layer 357, and an insulating material layer 358. An electrical signal applied from the first electrode 310 and the second electrode 320 may be transmitted to the active material layer 353 via the plurality of semiconductor layers 351 and 352 to emit light.

[0163] Specifically, the light emitting element 350 may include a first conductive semiconductor layer 351, a second conductive semiconductor layer 352, an active material layer 353 disposed between the first conductive semiconductor layer 351 and the second conductive semiconductor layer 352, an electrode material layer 357 disposed on the second conductive semiconductor layer 352, and an insulating material layer 358. Figure 7 In the light emitting element 350 shown in FIG. 1 , the first conductive type semiconductor layer 351, the active material layer 353, the second conductive type semiconductor layer 352, and the electrode material layer 357 are stacked one on another in the longitudinal direction in this order. However, it will be understood that the present disclosure is not limited thereto. The electrode material layer 357 may be eliminated. In some exemplary embodiments, the electrode material layer 357 may be disposed on at least one of the first conductive type semiconductor layer 351 and the second conductive type semiconductor layer 352. Hereinafter, as an example, Figure 7 The light emitting element 350 is provided.

[0164] The first conductive type semiconductor layer 351 may be an n-type semiconductor layer. For example, when the light emitting element 350 emits light in a blue wavelength band, the first conductive type semiconductor layer 351 may be a semiconductor material having the following formula: In x Al y Ga 1-x-yN(0≤x≤1, 0≤y≤1, 0≤x+y≤1). For example, the first conductive type semiconductor layer 351 may be at least one of n-type doped InAlGaN, GaN, AlGaN, InGaN, AlN, and InN. The first conductive type semiconductor layer 351 may be doped with a first conductive type dopant. For example, the first conductive type dopant may be Si, Ge, Sn, etc. The length of the first conductive type semiconductor layer 351 may be in the range of 1.5 μm to 5 μm, but is not limited thereto.

[0165] The second conductive type semiconductor layer 352 may be a p-type semiconductor layer. For example, when the light emitting element 350 emits light in a blue wavelength band, the first conductive type semiconductor layer 352 may be a semiconductor material having the following formula: In x Al y Ga 1-x-y N(0≤x≤1, 0≤y≤1, 0≤x+y≤1). For example, the second conductive type semiconductor layer 352 may be at least one of p-doped InAlGaN, GaN, AlGaN, InGaN, AlN, and InN. The second conductive type semiconductor layer 352 may be doped with a second conductive type dopant. For example, the second conductive type dopant may be Mg, Zn, Ca, Se, Ba, etc. The length of the second conductive type semiconductor layer 352 may be in the range of 0.08 μm to 0.25 μm, but is not limited thereto.

[0166] The active material layer 353 may be disposed between the first conductive semiconductor layer 351 and the second conductive semiconductor layer 352, and may include a material having a single quantum well structure or a multi-quantum well structure. When the active material layer 353 includes a material having a multi-quantum well structure, the quantum layer and the well layer may be alternately stacked in the structure. In response to an electrical signal applied through the first conductive semiconductor layer 351 and the second conductive semiconductor layer 352, the active material layer 353 may emit light when an electron-hole pair is combined in the active material layer 353. For example, when the active material layer 353 emits light in a blue wavelength range, the active material layer 353 may include materials such as AlGaN and AlInGaN. In particular, when the active material layer 353 has a multi-quantum well structure in which quantum layers and well layers are alternately stacked with each other, the quantum layer may include AlGaN or AlInGaN, and the well layer may include materials such as GaN or AlGaN. However, it will be understood that the present disclosure is not limited thereto. The active material layer 353 may have a structure in which a semiconductor material having a large band gap energy and a semiconductor material having a small band gap energy are alternately stacked with each other, and may include other III-group to V-group semiconductor materials according to the wavelength range of the emitted light. Therefore, the light emitted from the active material layer 353 is not limited to the light of the blue wavelength band. In some embodiments, the active material layer 353 may emit light of a red wavelength band or a green wavelength band. The length of the active material layer 353 may be in the range of 0.05 μm to 0.25 μm, but is not limited thereto.

[0167] Light emitted from the active material layer 353 can exit not only through the outer surface in the longitudinal direction of the light emitting element 350 but also through both side surfaces. That is, the direction in which light emitted from the active material layer 353 propagates is not limited to one direction.

[0168] The electrode material layer 357 may be an ohmic contact electrode. However, it will be understood that the present disclosure is not limited thereto. The electrode material layer 357 may be a Schottky contact electrode. The electrode material layer 357 may include a metal having conductivity. For example, the electrode material layer 357 may include at least one of aluminum (Al), titanium (Ti), indium (In), gold (Au), and silver (Ag). The electrode material layer 357 may include the same material or may include different materials. However, it will be understood that the present disclosure is not limited thereto.

[0169] The insulating material layer 358 may be formed outside the light emitting element 350 to protect the light emitting element 350. For example, the insulating material layer 358 may be formed to surround the side surface of the light emitting element 350 and not at both ends of the light emitting element 350 in the longitudinal direction. However, it will be understood that the present disclosure is not limited thereto. The insulating material layer 358 may include a silicon oxide (SiO x ), silicon nitride (SiN x ), silicon oxynitride (SiO x N y ), aluminum nitride (AlN) and aluminum oxide (Al 2 O 3 ) having insulating properties. Therefore, it is possible to prevent an electrical short circuit that may be generated when the active material layer 353 contacts the first electrode 310 or the second electrode 320. In addition, since the light emitting element 350 may include the insulating material layer 358 to protect the outer surface of the active material layer 353, it is possible to prevent a decrease in light emitting efficiency.

[0170] The insulating material layer 358 may extend in the longitudinal direction to cover from the first conductive type semiconductor layer 351 to the electrode material layer 357. However, it will be understood that the present disclosure is not limited thereto. The insulating material layer 358 may only cover the first conductive type semiconductor layer 351, the active material layer 353, and the second conductive type semiconductor layer 352, or the outer surface of the electrode material layer 357 may be exposed by the insulating material layer 358 covering only a portion thereof.

[0171] In some exemplary embodiments, the insulating material layer 358 may be subjected to surface treatment so that it is dispersed in the solution without agglomerating with another insulating material layer 358. During the process of aligning the light emitting elements 350 to be described below, the light emitting elements 350 remain dispersed in the solution to be independently aligned between the first electrode 310, the second electrode 320, and the third electrode 330. For example, the surface of the insulating material layer 358 may be treated to be hydrophobic or hydrophilic so that it can remain dispersed in the solution.

[0172] The thickness of the insulating material layer 358 may be, but is not limited to, in the range of 0.5 μm to 1.5 μm.

[0173] The light emitting element 350 may be cylindrical. It will be appreciated that the shape of the light emitting element 350 is not limited thereto, but may have various shapes such as a cube, a cuboid, and a hexagonal column. The length I of the light emitting element 350 may be in the range of 1 μm to 10 μm or 2 μm to 5 μm, and is preferably approximately 4 μm. The diameter of the light emitting element 350 may be in the range of 410 nm to 700 nm, and is preferably approximately 500 nm.

[0174] In the following, reference will be made to Figures 8 to 10A method of manufacturing the display device 10 according to an exemplary embodiment of the present disclosure is described.

[0175] Figures 8 to 10 is a plan view schematically illustrating a method of manufacturing a display device according to an exemplary embodiment of the present disclosure.

[0176] Reference Figure 8 , a plurality of electrodes 310, 320, and 330 are formed on the insulating base layer 300. The plurality of electrodes 310, 320, and 330 may be formed by patterning a metal or an organic material through a typical mask process.

[0177] As mentioned above Figure 1 As described, the first electrode trunk portion 310S and the second electrode trunk portion 320S extend in the first direction D1 and are spaced apart from each other and are positioned opposite to each other. Figure 1 In the embodiment, the first electrode trunk portion 310S is electrically separated and spaced apart from the first electrode trunk portion 310S of the adjacent pixel PX. Figure 8 In the embodiment, one end of the first electrode trunk 310S may extend across a plurality of adjacent pixels PX. One end of each of the first electrode trunk 310S and the second electrode trunk 320S may be connected to a signal applying pad so that AC power may be applied to align the light emitting element 350.

[0178] The first electrode branch portion 310B and the second electrode branch portion 320B branch out from the first electrode trunk portion 310S and the second electrode trunk portion 320S, respectively, and extend in the second direction D2. As described above, the first electrode branch portion 310B and the second electrode branch portion 320B extend in directions opposite to each other and are spaced apart from the second electrode trunk portion 320S and the first electrode trunk portion 310S, respectively.

[0179] The third electrode 330 is spaced apart from the first electrode branch 310B and the second electrode branch 320B and extends in the second direction D2. Figure 1 As shown in , the third electrode 330 is substantially parallel to the first electrode branch 310B and the second electrode branch 320B. It will be noted that since the third electrode 330 is neither electrically connected to the first electrode trunk 310S nor to the second electrode trunk 320S, the AC power applied from the signal applying pad may not be directly transmitted to the third electrode 330.

[0180] That is, in addition to the first electrode trunk portion 310S of each pixel PX extending to be connected to the first electrode trunk portion 310S of an adjacent pixel, Figure 8 The first electrode 310 and the second electrode 320 are Figure 1The first electrode 310 and the second electrode 320 are substantially the same. A detailed description thereof will not be given.

[0181] Then, refer to Fig. 9 , the light emitting element 350 is arranged between the electrodes 310 , 320 and 330 .

[0182] Although not shown in the drawings, a solution including the light emitting element 350 is applied between the first electrode branch 310B and the second electrode branch 320B. Then, AC power is applied from a signal applying pad connected to one end of each of the first electrode trunk 310S and the second electrode trunk 320S to align the light emitting element 350.

[0183] The AC power applied from the signal application pad may form a capacitance caused by the electric field between the first electrode branch 310B and the second electrode branch 320B. The light-emitting element 350 in the applied solution may receive a dielectrophoretic force (DEP force) through the capacitance caused by the electric field. The light-emitting element 350 may be aligned between the first electrode branch 310B and the third electrode 330 and between the third electrode 330 and the second electrode branch 320B through the DEP force. When the light-emitting element 350 receives the DEP force, one end of the light-emitting element 350 is connected to the first electrode branch 310B or the second electrode branch 320B, and the other end of the light-emitting element 350 is connected to the corresponding side of the third electrode 330.

[0184] The dielectrophoretic force applied to the light emitting element 350 by the capacitance can make the light emitting element 350 have a certain directionality between the electrodes 310, 320 and 330. For example, the first conductive semiconductor layer 351 of the light emitting element 350 can be connected to the first electrode branch 310B or the third electrode 330 near the second electrode branch 320B, and the second conductive semiconductor layer 352 can be connected to the second electrode branch 320B or the other side of the third electrode 330. However, it will be understood that the present disclosure is not limited to this. The light emitting element 350 can be aligned in any direction between the electrodes 310, 320 and 330.

[0185] Referenced above Fig. 9 The arrangement of the light emitting element 350 is described.

[0186] Then, refer to Fig.10 After aligning the light emitting element 350 between the electrodes 310, 320, and 330, a contact electrode 360 ​​is formed on the electrodes 310, 320, and 330 and is brought into contact with the light emitting element 350. Fig.10 Not shown, but Figure 4As shown in , a plurality of insulating layers may be provided on the electrodes 310, 320 and 330. As described above, the contact electrode 360 ​​may contact both sides of each of the light emitting elements 350 and the upper surface of each of the electrodes 310, 320 and 330 on the pixel defining layers 410, 420 and 430, respectively.

[0187] Finally, if Fig.10 As shown in FIG. 1 , the first electrode trunk portion 310S is cut at the cutting portion CB so that the first electrode trunk portion 310S is electrically separated, thereby making it possible to manufacture Figure 1 The display device 10 of FIG. 1 is a display device 10 of FIG. 1. The method of electrically separating the first electrode trunk 310S is not particularly limited. For example, a laser may be used to cut a portion of the first electrode trunk 310S located at the cutting portion CB. As a result, the first electrode trunk 310S may be electrically separated and spaced apart from each other between adjacent pixels PX.

[0188] In addition, the first electrode 310 and the second electrode 320 may be electrically connected to the first thin film transistor 120 and the power supply electrode 162 through the first electrode contact hole CNTD on the first electrode trunk 310S and the second electrode contact hole CNTS on the second electrode trunk 320S. Therefore, a current caused by the driving voltage and the supply voltage may flow between the first electrode 310 and the second electrode 320, so that the light emitting elements 350 arranged between the first electrode 310 and the third electrode 330 and between the third electrode 330 and the second electrode 320 may be connected in series.

[0189] As described above, in the display device 10 according to the exemplary embodiment of the present disclosure, the third electrode 330 is disposed between the first electrode branch portion 310B and the second electrode branch portion 320B, so that the light emitting element 350 can be aligned between the electrodes to be connected in series. Therefore, when the display device 10 is driven, the voltage division efficiency can be improved, the capacity of the thin film transistor can be easily designed, and the loss caused by the line resistance can be improved.

[0190] Hereinafter, a display device 10 according to another exemplary embodiment of the present disclosure will be described. Figures 11 to 13 is a plan view of a display device according to another exemplary embodiment of the present disclosure.

[0191] Reference Fig.11 and Fig.12 , the display device 10 may include a plurality of third electrodes 330 as described above. Fig.11The display device 10_1 may include two third electrodes 330_1 between the first electrode branch 310B_1 and the second electrode branch 320B_1. Therefore, the light emitting element 350 may be arranged between the first electrode 310_1 and the third electrode 330_1, between the third electrode 330_1 and the third electrode 330_1, and between the third electrode 330_1 and the second electrode 320_1. The number of light emitting elements 350 connected in series may be three. Fig.12 The display device 10_2 includes six third electrodes 330_2, and the number of the light emitting elements 350 connected in series may be seven.

[0192] and Figure 1 Compared to the display device 10 shown in , the number of light emitting elements 350 connected in series may vary according to the number of third electrodes 330. When an odd number of third electrodes 330 are included in one pixel PX of the display device 10, an even number of light emitting elements 350 connected in series may exist in the pixel PX. On the other hand, when an even number of third electrodes 330 are included, an odd number of light emitting elements 350 connected in series may exist.

[0193] In other words, when the pixel of the display device 10 includes n third electrodes 330, the number of the light-emitting elements 350 connected in series may be n+1. The number of the light-emitting elements 350 connected in series increases with the number of the third electrodes 330, thereby improving the voltage division efficiency and further improving the power loss caused by the line resistance.

[0194] Fig.13 is a plan view of a display device according to still another exemplary embodiment of the present disclosure.

[0195] Reference Fig.13 , the display device 10_3 may include one second electrode 320_3 and two first electrodes 310_3 spaced apart from each other, and the second electrode 320_3 may be disposed between the first electrodes 310_3. A plurality of third electrodes 330_3 may be disposed between the first electrode 310_3 and the second electrode 320_3. Fig.13 An example is shown in which two third electrodes 330_3 are disposed between the first electrode 310_3 and the second electrode 320_3, but the present disclosure is not limited thereto.

[0196] Specifically, the display device 10_3 may include a plurality of first electrode branch portions 310B_3 branching from the first electrode trunk portion 310S_3. Fig.13 In the example shown in FIG. 3 , two first electrode branches 310B_3 are spaced apart from each other in one pixel PX, but the present disclosure is not limited thereto. A greater number of first electrode branches 310B_3 may branch out from the first electrode trunk portion 310S_3 .

[0197] One second electrode branch portion 320B_3 may branch out from the second electrode trunk portion 320S_3 in one pixel PX. The second electrode branch portion 320B_3 may be disposed between two first electrode branches 310B_3 and may be equally spaced from them. In other words, the second electrode branch portion 320B_3 may be disposed at the center between the first electrode branches 310B_3 spaced apart from each other. Therefore, one pixel PX of the display device 10_3 may have a laterally symmetrical structure relative to the second electrode branch portion 320B_3. However, it will be understood that the present disclosure is not limited thereto. The second electrode branch portion 320B_3 may be disposed closer to one of the first electrode branches 310B_3 so that the structure of the pixel may be asymmetric.

[0198] The third electrode 330_3 may be disposed between the second electrode branch 320B_3 and the two first electrode branches 310B_3 . Fig.13 It is shown that two third electrodes 330_3 are disposed on either side of the second electrode branch 320B_3, so that four third electrodes 330_3 are disposed in one pixel PX. However, it should be understood that the present disclosure is not limited thereto. It will be understood that a greater number of third electrodes 330_3 may be disposed.

[0199] The light emitting element 350 may be disposed between the first electrode branch 310B_3 and the third electrode 330_3, between the third electrodes 330_3, and between the third electrode 330_3 and the second electrode branch 320B_3. Fig.13 In the embodiment, the light emitting elements disposed between the first electrode branch 310B_3 and the third electrode 330_3, between the third electrode 330_3, and between the third electrode 330_3 and the second electrode branch 320B_3 disposed on the left side of the second electrode branch 320B_3 are referred to as the first light emitting element array 350A_1. The light emitting elements disposed between the first electrode branch 310B_3 and the third electrode 330_3, between the third electrode 330_3, and between the third electrode 330_3 and the second electrode branch 320B_3 disposed on the right side of the second electrode branch 320B_3 are referred to as the second light emitting element array 350A_2.

[0200] Since one or more third electrodes 330_3 are disposed on the left side of the second electrode branch 320B_3, the first light-emitting element queue 350A_1 may include one or more light-emitting element queues. Since one or more third electrodes 330_3 are disposed on the right side of the second electrode branch 320B_3, the second light-emitting element queue 350A_2 may include one or more light-emitting element queues. In each of the first light-emitting element queue 350A_1 and the second light-emitting element queue 350A_2, one or more light-emitting elements may be connected in series. In the light-emitting element queues connected in series, current may flow from the first electrode branch 310B_3 to the second electrode branch 320B_3 via the third electrode 330_3.

[0201] On the other hand, the first light emitting element queue 350A_1 and the second light emitting element queue 350A_2 respectively disposed on the left and right sides of the second electrode branch portion 320B_3 may be connected in parallel to each other. Since current flows from different first electrode branch portions 310B_3 to the same second electrode branch portion 320B_3 in each of the first light emitting element queue 350A_1 and the second light emitting element queue 350A_2, they may be connected in parallel. In other words, according to this exemplary embodiment of the present disclosure, the display device 10_3 may have a light emitting element queue of a series-parallel structure.

[0202] As described above, the third electrode 330 may be substantially the same as the first electrode branch 310B or the second electrode branch 320B. In some exemplary embodiments, the third electrode 330 may be formed by electrically separating the first electrode branch 310B and the second electrode branch 320B from the first electrode trunk 310S and the second electrode trunk 320S, respectively. Fig.14 and Fig.19 Give a more detailed description thereof.

[0203] Fig.14 is a plan view of a display device according to still another exemplary embodiment of the present disclosure.

[0204] Reference Fig.14 The display device 10_4 may include a first electrode trunk 310S_4, a second electrode trunk 320S_4, a first electrode branch 310B_4, a second electrode branch 320B_4, and a third electrode 330_4. The arrangement and structure of the first electrode trunk 310S_4, the second electrode trunk 320S_4, the first electrode branch 310B_4, and the second electrode branch 320B_4 are similar to those of the reference Figure 1 The arrangement and structure described are the same. The following description will focus on the differences.

[0205] The third electrode 330_4 may include a third electrode branch 330B_4 and a third electrode segment 330G_4.

[0206] The third electrode segment 330G_4 may include a 3-1st electrode segment 330Ga_4 branched from the first electrode trunk portion 310S_4 and terminated while being spaced apart from the third electrode branch portion 330B_4 and a 3-2nd electrode segment 330Gb_4 branched from the second electrode trunk portion 320S_4 and terminated while being spaced apart from the third electrode branch portion 330B_4.

[0207] The third electrode branch 330B_4 may include a 3-1st electrode branch 330Ba_4 spaced apart from the 3-1st electrode segment 330Ga_4 and extending in the second direction D2 to be aligned with the 3-1st electrode segment 330Ga_4, and a 3-2nd electrode branch 330Bb_4 spaced apart from the 3-2nd electrode segment 330Gb_4 and extending in the second direction D2 to be aligned with the 3-2nd electrode segment 330Gb_4.

[0208] In summary, the 3-1st electrode branch portion 330Ba_4 may extend in the second direction D2 and may terminate while being spaced apart from the 3-1st electrode segment 330Ga_4 and the second electrode trunk portion 320S_4. The 3-1st electrode branch portion 330Ba_4 and the 3-1st electrode segment 330Ga_4 may extend and be aligned with each other. The 3-2nd electrode branch portion 330Bb_4 may extend in the second direction D2 and may terminate while being spaced apart from the 3-2nd electrode segment 330Gb_4 and the first electrode trunk portion 310S_4. The 3-2nd electrode branch portion 330Bb_4 and the 3-2nd electrode segment 330Gb_4 may extend and be aligned with each other.

[0209] The third electrode 330_4 may be formed by being disposed and extended in the second direction D2 from the first electrode trunk portion 310S_4 and the second electrode trunk portion 320S_4 and then electrically separated from the first electrode trunk portion 310S_4 and the second electrode trunk portion 320S_4 by laser, etc. That is, the third electrode 330_4 may be substantially the same as the first electrode branch portion 310B_4 and the second electrode branch portion 320B_4, but may be electrically separated from the electrode trunk portions 310S_4 and 320S_4.

[0210] Fig.14 The display device 10_4 and Figure 1The difference of the display device 10 is that the third electrode 330_4 may further include electrode segments 330Ga_4 and 330Gb_4 branching from the first electrode trunk 310S_4 and the second electrode trunk 320S_4. That is, the 3-1st electrode branch 330Ba_4 and the 3-1st electrode segment 330Ga_4 may be formed by electrically separating the first electrode branch 310B_4 from the first electrode trunk 310S_4. The 3-2nd electrode branch 330Bb_4 and the 3-2nd electrode segment 330Gb_4 may be formed by electrically separating the second electrode branch 320B_4 from the second electrode trunk 320S_4.

[0211] However, it will be understood that the present disclosure is not limited thereto. All of the third electrodes 330_4 may be formed by electrically separating the first electrode branch portions 310B_4 or the second electrode branch portions 320B_4 from the electrode trunk portions 310S_4 and 320S_4, respectively.

[0212] The electrode branches of each of the pixels PX may be arranged in parallel in the first direction D1, but their ends may not be aligned with each other. For example, one end of the 3-1 electrode branch 330Ba_4 may protrude from one end of each of the second electrode branch 320B_4 and the 3-2 electrode branch 330Bb_4 in the second direction D2. On the contrary, one end of the 3-2 electrode branch 330Bb_4 may protrude from one end of each of the first electrode branch 310B_4 and the 3-1 electrode branch 330Ba_4 in the second direction D2. That is, the plurality of electrode branches provided in each pixel PX may include an area that partially protrudes without overlapping with an area that overlaps in the first direction D1. However, it will be understood that the present disclosure is not limited thereto. When forming the 3-1st electrode branch portion 330Ba_4 and the 3-2nd electrode branch portion 330Bb_4, regions cut off from the first electrode trunk portion 310S_4 and the second electrode trunk portion 320S_4 may be adjusted so that both ends of each of the electrode branch portions may be aligned with each other.

[0213] The light emitting elements 350 may be arranged between the first electrode branch 310B_4 and the 3-2 electrode branch 330Bb_4, between the 3-2 electrode branch 330Bb_4 and the 3-1 electrode branch 330Ba_4, and between the 3-1 electrode branch 330Ba_4 and the second electrode branch 320B_4. The light emitting elements 350 arranged between the electrode branches may be connected in series so that they may emit light when current flows in the first electrode branch 310B_4, the 3-2 electrode branch 330Bb_4, the 3-1 electrode branch 330Ba_4, and the second electrode branch 320B_4.

[0214] Figures 15 to 17 is used to show the manufacturing Fig.14 A plan view of a display device of the method.

[0215] First, refer to Fig.15 In the display device 10_4, a plurality of electrodes, for example, a first electrode 310_4 and a second electrode 320_4 are formed on the insulating base layer 300. The first electrode 310_4 and the second electrode 320_4 include electrode trunks 310S_4 and 320S_4 and electrode branches 310B_4 and 320B_4, respectively. Fig.15 Two first electrode branches 310B_4 and two second electrode branches 320B_4 are shown, but the present disclosure is not limited thereto. The arrangement and structure of the first electrode trunk 310S_4, the second electrode trunk 320S_4, the first electrode branch 310B_4 and the second electrode branch 320B_4 are similar to those of the reference Fig.14 The arrangement and structure described are the same. At least some of the first electrode branches 310B_4 and the second electrode branches 320B_4 may be used to form third electrode branches 330B_4 and third electrode segments 330G_4 via subsequent processes to be described below.

[0216] Then, refer to Fig.16 , a light emitting element 350 is arranged between the electrode branches 310B_4 and 320B_4. The detailed description thereof is substantially the same as that of the above reference Fig. 9 The same is given, so redundant description will be omitted.

[0217] Then, refer to Fig.17 The first electrode trunk 310S_4, the second electrode trunk 320S_4, the first electrode branch 310B_4, and the second electrode branch 320B_4 are cut at the cutting portion CB located on the first electrode trunk 310S_4, the second electrode trunk 320S_4, the first electrode branch 310B_4, and the second electrode branch 320B_4. The first electrode branch 310B_4 and the second electrode branch 320B_4 electrically separated at the cutting portion CB can form a third electrode branch 330B_4 and a third electrode segment 330G_4. Fig.10 Unlike the example shown in Fig.17 In the example shown in FIG. 3 , some of the first electrode branch 310B_4 and the second electrode branch 320B_4 are also electrically disconnected at the cutting portion CB. That is, the third electrode 330_4 may be generated by forming a separate electrode or line, i.e., the third electrode 330_4 may be formed by cutting some of the first electrode branch 310B_4 and the second electrode branch 320B_4.

[0218] For example, the first electrode branch 310B_4 and the second electrode branch 320B_4 located on the outside relative to the center of the pixel PX can be electrically connected to the first electrode trunk 310S_4 and the second electrode trunk 320S_4, respectively, to directly receive electrical signals from the first electrode trunk 310S_4 and the second electrode trunk 320S_4. On the other hand, the first electrode branch 310B_4 and the second electrode branch 320B_4 located on the inside relative to the center of the pixel PX are electrically separated from the first electrode trunk 310S_4 and the second electrode trunk 320S_4, respectively, to form a third electrode branch 330B_4. In this case, the third electrode fragment 330G_4 branched out from the first electrode trunk 310S_4 and the second electrode trunk 320S_4 can be formed together. However, it will be understood that the present disclosure is not limited to this. The third electrode fragment 330G_4 can be eliminated according to the way of cutting the electrode.

[0219] In addition, the first electrode 310_4 and the second electrode 320_4 may be electrically connected to the first thin film transistor 120 and the power supply electrode 162 , respectively, through the first electrode contact hole CNTD on the first electrode trunk portion 310S and the second electrode contact hole CNTS on the second electrode trunk portion 320S.

[0220] Hereinafter, a display device according to still another exemplary embodiment of the present disclosure will be described.

[0221] Fig.18 and Fig.19 is a plan view of a display device according to another exemplary embodiment of the present disclosure.

[0222] Reference Fig.18 As described above, there may be a plurality of electrodes 330. In addition to providing a greater number of third electrode branches 330B_5 and a greater number of third electrode segments 330G_5, Fig.18 The display device 10_5 and Fig.14 The display device 10_4 is the same. Fig.18 In the embodiment, the pixel of the display device 10_5 may include six third electrode branches 330B_5, so seven light emitting elements 350 are connected in series. As described above, as the number of aligned light emitting elements 350 increases, the voltage division efficiency of the display device and the power loss caused by the line resistance can be improved. Fig.18 The display device 10_5 in FIG. Fig.18 The display device 10_5 and Fig.12 The same as the display device 10_2 in.

[0223] Reference Fig.19 The display device 10_6 includes a ratio Fig.14The display device 10_4 has one more first electrode branch 310B_6, and the electrode of the display device 10_6 has a symmetrical structure relative to the second electrode branch 320B_6. Therefore, each of the first light-emitting element queue 350A_1 located on the left side of the second electrode branch 320B_6 and the second light-emitting element queue 350A_2 located on the right side of the second electrode branch 320B_6 may include a series of light-emitting element queues, and may be connected in parallel with each other. The detailed description thereof is the same as that of the above reference Fig.13 The description given is the same.

[0224] Incidentally, as described above, the first electrode 310 and the second electrode 320 may be used as a line through which AC power for aligning the light emitting element 350 is applied. In addition, power for driving the display device 10 may be applied via the electrodes so that an electrical signal may be applied to the light emitting element 350. However, it will be understood that the present disclosure is not limited thereto. At least one of the first electrode 310 and the second electrode 320 may have different lines, one of which is applied with AC power for aligning the light emitting element 350, and the other of which is applied with power for driving the display device 10. This will be described in detail below.

[0225] Fig. 20 is a plan view of a display device according to still another exemplary embodiment of the present disclosure.

[0226] Reference Fig. 20 The first electrode 310_7 of the display device 10_7 includes a first electrode trunk 310S_7 and a first electrode branch 310B_7 branched from the first electrode trunk 310S_7. The first electrode trunk 310S_7 and the first electrode branch 310B_7 are similar to those described above. Figure 1 The first electrode trunk portion 310S and the first electrode branch portion 310B of the display device 10 and Fig.14 The first electrode trunk portion 310S_4 and the first electrode branch portion 310B_4 of the display device 10_4 are the same, and a detailed description thereof will be omitted.

[0227] The second electrode 320 may include a second electrode branch 320B'_7, a second electrode segment 320G'_7, and a second electrode line 320S'_7. Figure 1 Unlike the example shown in Fig. 20In the display device 10_7 of the present invention, the second electrode branch portion 320B'_7 branches out from the first electrode trunk portion 310S_7 and is electrically separated via a process to be described later. That is, during the process of manufacturing the display device 10_7, the first electrode branch portion 310B_7 is separated from the first electrode trunk portion 310S_7, so that the second electrode branch portion 320B'_7 and the second electrode segment 320G'_7 can be formed. However, it will be understood that the present disclosure is not limited to this. The second electrode branch portion 320B'_7 can be formed by a separate line or electrode.

[0228] The second electrode branch 320B'_7 may extend in the second direction D2 and may be spaced apart from the first electrode branch 310B_7. One end of the second electrode branch 320B'_7 is spaced apart from the second electrode segment 320G'_7, and the other end of the second electrode branch 320B'_7 may be electrically connected to the second electrode line 320S'_7 extending in the first direction D1.

[0229] The second electrode segment 320G'_7 may protrude from the first electrode trunk 310S_7 in the second direction D2. The second electrode segment 320G'_7 may be disposed to face the terminating end of the second electrode branch 320B'_7. That is, the second electrode branch 320B'_7 and the second electrode segment 320G'_7 may be aligned with each other in the second direction D2.

[0230] The third electrode 330_7 is disposed between the first electrode branch 310B_7 and the second electrode branch 320B'_7. The arrangement and structure of the third electrode 330_7 are similar to those described above. Figure 1 and Fig.14 It should be noted that, as will be described later, the third electrode 330_7 can be formed by connecting the second electrode branch portion 320B_7 with the second electrode trunk portion 320S_7 (see FIG. 1 ) during the process of manufacturing the display device 10_7. Fig.21 ) is formed by electrical separation.

[0231] The second electrode line 320S'_7 may extend in the first direction D1 and may be spaced apart from the first electrode trunk portion 310S_7. Fig. 20 , but the second electrode line 320S'_7 may be disposed in a different line layer from the first electrode trunk 310S_7. Therefore, the second electrode line 320S'_7 may be electrically connected to the second electrode branch 320B'_7 through the second electrode contact hole CNTS. The second electrode line 320S'_7 may be connected to the power supply line 161 described above, and a supply voltage may be applied to the second electrode branch 320B'_7. On the other hand, the second electrode trunk 320S_7 (see Fig.21) may be applied with an AC voltage for aligning the light emitting element 350 during a process of manufacturing the display device 10_7. That is, the display device 10_7 may include two different lines (ie, the second electrode line 320S'_7 and the second electrode trunk 320S_7) to thereby apply different voltages.

[0232] The light emitting element 350 may be disposed between the first electrode branch 310B_7 and the third electrode 330_7 and between the third electrode 330_7 and the second electrode branch 320B'_7. Some of the light emitting elements 350 may have one end electrically connected to the first electrode branch 310B_7 and the other end connected to the third electrode 330_7. Others of the light emitting elements 350 may have one end connected to the electrode 330_7 and the other end electrically connected to the second electrode branch 320B'_7. Therefore, the light emitting element 350 may be connected in series between the first electrode branch 310B_7 and the second electrode branch 320B'_7. The light emitting element 350 may receive a driving voltage and a supply voltage from the first electrode trunk 310S_7 connected to the first thin film transistor 120 through the first electrode contact hole CNTD and the second electrode branch 320B'_7 connected to the power supply electrode 162 of the second electrode line 320S'_7 through the second electrode contact hole CNTS, respectively.

[0233] Figure 21 to Figure 23 is used to show the manufacturing Fig. 20 A plan view of a display device of the method.

[0234] Reference Fig.21 A first electrode trunk portion 310S_7 , a first electrode branch portion 310B_7 , a second electrode trunk portion 320S_7 , a third electrode 330_7 , a second electrode branch portion 320B′_7 and a second electrode line 320S′_7 are formed on the insulating base layer 300 .

[0235] The first electrode trunk portion 310S_7 and the first electrode branch portions 310B_7 are the same as the first electrode trunk portion and the first electrode branch portions described above, and thus, redundant descriptions will be omitted.

[0236] The third electrode 330_7 branches from the second electrode trunk portion 320S_7 to extend in the second direction D2 and is separated from the first electrode trunk portion 310S_7. The third electrode 330_7 is spaced apart from the first electrode branch portion 310B_7, and they extend in opposite directions to each other in the second direction D2.

[0237] The second electrode branch portion 320B'_7 branches out from the first electrode trunk portion 310S_7 to extend in the second direction D2 and is spaced apart from the first electrode branch portion 310B_7. The second electrode branch portion 320B'_7 may extend in the same direction as the first electrode branch portion 310B_7. The end of the second electrode branch portion 320B'_7 may protrude more toward the second electrode trunk portion 320S_7 than the end of the first electrode branch portion 310B_7. Because the second electrode branch portion 320B'_7 is electrically connected to the second electrode line 320S'_7 through the second electrode contact hole CNTS via a process to be described later, it may cover the second electrode line 320S'_7 when viewed from the top.

[0238] The second electrode line 320S'_7 extends in the first direction D1 and is disposed between the first electrode trunk 310S_7 and the second electrode trunk 320S_7. The second electrode line 320S'_7 may be disposed in a different line layer from the first electrode trunk 310S_7 and the second electrode trunk 320S_7, and may be electrically connected to the second electrode branch 320B'_7 through a second electrode contact hole CNTS to be described below.

[0239] Then, refer to Fig. 22 , aligning one or more light emitting elements 350 between the first electrode branch 310B_7, the third electrode 330_7, and the second electrode branch 320B'_7. To align the light emitting elements 350, AC power is applied to the first electrode trunk 310S_7 and the second electrode trunk 320S_7 to form a capacitance caused by the electric field between the electrodes. The light emitting elements 350 may be aligned as described above.

[0240] Then, refer to Fig.23 A contact electrode 360 ​​is formed on the first electrode branch 310B_7, the third electrode 330_7, and the second electrode branch 320B_7 to contact the light emitting element 350. The above elements may be further formed on the contact electrode 360. A detailed description thereof will be omitted.

[0241] Finally, if Fig.23As shown in , the first electrode trunk 310S_7, the second electrode branch 320B'_7, the third electrode 330_7 and the second electrode trunk 320S_7 are electrically separated at the cutting portion CB. Then, the first electrode trunk 310S_7 can be electrically connected to the first thin film transistor 120 through the first electrode contact hole CNTD, and the second electrode line 320S'_7 can be electrically connected to the second electrode branch 320B'_7 through the second electrode contact hole CNTS. In addition, the second electrode branch 320B'_7 can be electrically separated from the first electrode trunk 310S_7 and can be spaced apart from the second electrode segment 320G'_7. The third electrode 330_7 can be electrically separated from the second electrode trunk 320S_7.

[0242] Therefore, current may flow between the first electrode branch portion 310B_7 and the second electrode branch portion 320B'_7. The light emitting elements 350 disposed between the first electrode branch portion 310B_7 and the third electrode 330_7 and between the third electrode 330_7 and the second electrode branch portion 320B'_7 may be connected in series.

[0243] At the end of the detailed description, those skilled in the art will appreciate that many changes and modifications may be made to the preferred embodiment without departing substantially from the principles of the invention. Therefore, the preferred embodiments of the disclosed invention are used only in a general and descriptive sense and not for purposes of limitation.

Claims

1. A display device, comprising: a first electrode trunk and a second electrode trunk extending in a first direction and spaced apart from each other; at least one first electrode branch portion branching from the first electrode trunk portion and extending in a second direction different from the first direction; a second electrode branch portion branching out from the second electrode trunk portion and extending in a second direction; at least one third electrode, disposed between the first electrode branch portion and the second electrode branch portion; One or more light emitting elements are disposed between the first electrode branch and the third electrode and between the third electrode and the second electrode branch; A first contact electrode is disposed on the first electrode branch portion and is in contact with the light emitting element; A second contact electrode is disposed on the second electrode branch portion and is in contact with the light emitting element; as well as at least one third contact electrode, disposed on the third electrode and in contact with the light emitting element, The third electrode extends in the second direction, and two ends of the third electrode in the second direction are spaced apart from the first electrode main body and the second electrode main body, respectively. The light-emitting element includes: a first light-emitting element disposed between the first electrode branch portion and the third electrode; and a second light-emitting element disposed between the third electrode and the second electrode branch portion. The first contact electrode contacts the first electrode branch and the first light emitting element, the second contact electrode contacts the second electrode branch and the second light emitting element, and the third contact electrode contacts the first light emitting element and the second light emitting element.

2. The display device according to claim 1, in, The first electrode branch portion extends in the second direction opposite to the second electrode branch portion.

3. The display device according to claim 2, in, The first light emitting element and the second light emitting element are connected in series between the first electrode branch portion and the second electrode branch portion.

4. The display device according to claim 3, in, A first end of the first light emitting element is connected to the first electrode branch portion, and a second end of the first light emitting element is connected to the third electrode, wherein the first end or the second end of the first light emitting element comprises a p-type semiconductor layer, and the second end or the first end of the first light emitting element comprises an n-type semiconductor layer, and The first light emitting element includes an active material layer disposed between a p-type semiconductor layer and an n-type semiconductor layer.

5. The display device according to claim 1, in, The display device includes a plurality of first electrode branch portions branching from a first electrode trunk portion, and The second electrode branch portion is disposed between the plurality of first electrode branch portions.

6. The display device according to claim 5, in, The third electrode is at least disposed between the second electrode branch portion and the first electrode branch portion disposed on one side of the second electrode branch portion and between the second electrode branch portion and the first electrode branch portion disposed on the opposite side of the second electrode branch portion.

7. The display device according to claim 6, in, The display device includes two or more third electrodes, wherein the light emitting element is provided between adjacent ones of the third electrodes.

8. The display device according to claim 7, in, The light-emitting elements include: a third light emitting element electrically connected to the one side of the second electrode branch; and a fourth light emitting element electrically connected to the opposite side of the second electrode branch portion, The third light emitting element and the fourth light emitting element are connected in parallel between the one side and the opposite side of the second electrode branch portion.

9. The display device according to claim 8, in, The plurality of first electrode branches and the plurality of third electrodes are disposed symmetrically with respect to the second electrode branches.

10. A display device, comprising: a first electrode trunk and a second electrode trunk extending in a first direction and spaced apart from each other; at least one first electrode branch portion branching from the first electrode trunk portion and extending in a second direction different from the first direction; a second electrode branch portion branching out from the second electrode trunk portion and extending in a second direction; at least one third electrode extending in the second direction and disposed between the first electrode branch portion and the second electrode branch portion; One or more light emitting elements are disposed between the first electrode branch and the third electrode and between the third electrode and the second electrode branch; A first contact electrode is disposed on the first electrode branch portion and is in contact with the light emitting element; A second contact electrode is disposed on the second electrode branch portion and is in contact with the light emitting element; as well as at least one third contact electrode, disposed on the third electrode and in contact with the light emitting element, Wherein, the third electrode comprises: a third electrode segment protruding from the first electrode trunk portion and the second electrode trunk portion in the second direction; and A third electrode branch portion is arranged to extend in the second direction to be spaced apart from the third electrode segment, The light-emitting element includes: a first light-emitting element disposed between the first electrode branch portion and the third electrode branch portion; and a second light-emitting element disposed between the third electrode branch portion and the second electrode branch portion. The first contact electrode contacts the first electrode branch and the first light emitting element, the second contact electrode contacts the second electrode branch and the second light emitting element, and the third contact electrode contacts the first light emitting element and the second light emitting element.

11. The display device according to claim 10, in, The third electrode includes: two or more third electrode branches spaced apart from each other between the first electrode branch and the second electrode branch, and The light-emitting element includes: a fifth light-emitting element having one end electrically connected to the first electrode branch and the other end connected to the third electrode branch; a sixth light-emitting element having two ends electrically connected to the plurality of third electrode branches; and a seventh light-emitting element having one end electrically connected to the third electrode branch and the other end connected to the second electrode branch. The fifth light-emitting element, the sixth light-emitting element and the seventh light-emitting element are connected in series between the first electrode branch portion and the second electrode branch portion.

12. A display device, comprising: a first electrode trunk and a second electrode line extending in a first direction and spaced apart from each other; at least one first electrode branch portion branching from the first electrode trunk portion and extending in a second direction different from the first direction; a second electrode branch portion spaced apart from the first electrode branch portion and extending in a second direction to terminate in a state of being spaced apart from the first electrode trunk portion; a third electrode disposed between the first electrode branch portion and the second electrode branch portion to extend in the second direction, both ends of the third electrode terminating in a state of being spaced apart from the first electrode trunk portion and the second electrode line; One or more light emitting elements are disposed between the first electrode branch portion, the second electrode branch portion, and the third electrode; A first contact electrode is disposed on the first electrode branch portion and is in contact with the light emitting element; A second contact electrode is disposed on the second electrode branch portion and is in contact with the light emitting element; as well as at least one third contact electrode, disposed on the third electrode and in contact with the light emitting element, The second electrode branch is electrically connected to the second electrode line. The light-emitting element includes: a first light-emitting element disposed between the first electrode branch portion and the third electrode; and a second light-emitting element disposed between the third electrode and the second electrode branch portion. The first contact electrode contacts the first electrode branch and the first light emitting element, the second contact electrode contacts the second electrode branch and the second light emitting element, and the third contact electrode contacts the first light emitting element and the second light emitting element.

13. The display device according to claim 12, in, The first electrode trunk and the second electrode line are arranged in different line layers, and The second electrode branch is electrically connected to the second electrode line through the contact hole.

14. The display device according to claim 13, in, The display device further includes a second electrode segment protruding from the first electrode trunk portion in a second direction.

15. The display device according to claim 14, in, The second electrode segment extends in the second direction and is aligned with the second electrode branch.

16. The display device according to claim 15, in, The first electrode trunk is electrically connected to the thin film transistor, wherein the second electrode line is electrically connected to the power supply line, The first light emitting element and the second light emitting element are connected in series between the first electrode branch portion and the second electrode branch portion.

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