Display device and method of manufacturing the same

Abstract

A display device and a manufacturing method thereof are provided. The display device includes: a first region extending in a first direction; a second region extending in the first direction and arranged side by side with the first region in a second direction intersecting the first direction; at least one first light-emitting element arranged in the first region; at least one second light-emitting element arranged in the second region; at least one first wiring connected to one end of the first light-emitting element in the first region and having at least a portion extending in the first direction; and at least one second wiring connected to one end of the second light-emitting element in the second region and having at least a portion extending in the first direction, wherein the first wiring and the second wiring are electrically insulated from each other.

Description

Technical Field

[0001] The present disclosure relates to a display device and a method for manufacturing the same. Background Art

[0002] As multimedia develops, display devices are becoming more and more important. Therefore, various types of display devices, such as organic light emitting displays and liquid crystal displays, are being used.

[0003] The display device is a device for displaying 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 such as a light-emitting diode (LED). For example, the LED may be an organic light-emitting diode (OLED) using an organic material as a fluorescent material, or may be an inorganic LED using an inorganic material as a fluorescent material.

[0004] OLEDs using organic materials as fluorescent materials of light-emitting elements can be manufactured with a simple process and can have flexible characteristics. However, it is known that organic materials are susceptible to high temperature driving environments and have relatively low blue light efficiency.

[0005] On the other hand, inorganic LEDs using inorganic semiconductors as fluorescent materials are durable even in high temperature environments and have higher blue light efficiency than OLEDs. In addition, a transfer method using dielectrophoresis (DEP) has been developed for the manufacturing process that has been pointed out as a limitation of conventional inorganic LEDs. Therefore, continuous research has been conducted on inorganic LEDs having better durability and efficiency than OLEDs. Summary of the invention

[0006]

Technical issues

[0007] A display device is provided, which includes an alignment wiring that applies a different alignment signal to each alignment area in which a light emitting element is aligned.

[0008] A method of manufacturing a display device is provided, the method being used to minimize a voltage drop of an alignment signal applied to align a light emitting element.

[0009] However, aspects of the present disclosure are not limited to the aspects set forth herein. The above and other aspects of the present disclosure will become more apparent to those skilled in the art to which the present disclosure pertains by referring to the detailed description of the present disclosure given below.

[0010]

Technical solution

[0011] According to aspects of the embodiments, a display device includes: a first region extending in a first direction; a second region extending in the first direction and arranged side by side with the first region in a second direction intersecting the first direction; at least one first light-emitting element arranged in the first region; at least one second light-emitting element arranged in the second region; at least one first wiring connected to one end of the first light-emitting element in the first region and having at least a portion extending in the first direction; and at least one second wiring connected to one end of the second light-emitting element in the second region and having at least a portion extending in the first direction, wherein the first wiring and the second wiring are electrically insulated from each other.

[0012] The display device may further include a third wiring having at least a portion extending from the first side of the first region to the second side of the second region in the second direction, wherein the third wiring may include at least one third wiring branch portion and a third wiring rod portion extending in the second direction, the third wiring branch portion having at least some portions extending in the first direction and spaced apart from each other in the first region and the second region.

[0013] The third wiring branch portion may be connected to the other end of the first light emitting element in the first region, and connected to the other end of the second light emitting element in the second region.

[0014] The first wiring may include a first wiring branch portion extending in a first direction in a first area and a first wiring rod portion extending in a second direction from a first side of the first area to a second side of the first area, and the second wiring may include a second wiring branch portion extending in the second direction in the second area and a second wiring rod portion extending in a second direction from the first side of the first area to a second side of the second area.

[0015] The display device may include: a display area extending in a second direction; and a non-display area extending in the second direction and located on both sides of the display area in the first direction, wherein the first wiring rod portion, the second wiring rod portion and the third wiring rod portion may be arranged in the non-display area.

[0016] The non-display area may include a first non-display area located on one side of the display area and a second non-display area located on the other side of the display area.

[0017] The first wiring rod portion may include a first-first sub-wiring rod portion arranged in the first non-display area and a first-second sub-wiring rod portion arranged in the second non-display area, the second wiring rod portion may include a second-first sub-wiring rod portion arranged in the first non-display area and a second-second sub-wiring rod portion arranged in the second non-display area, and the third wiring rod portion may include a third-first sub-wiring rod portion arranged in the first non-display area and a third-second sub-wiring rod portion arranged in the second non-display area.

[0018] The third wiring branch portion may have one end spaced apart from the third-first sub-wiring rod portion and the other end spaced apart from the third-second sub-wiring rod portion, the first wiring branch portion may have two ends respectively connected to the first-first sub-wiring rod portion and the first-second sub-wiring rod portion, and the second wiring branch portion may have two ends respectively connected to the second-first sub-wiring rod portion and the second-second sub-wiring rod portion.

[0019] The display device may further include: a first wiring layer, including a first wiring, a second wiring and a third wiring; and a second wiring layer, located on the first wiring layer and including a first bridging wiring connecting the first wiring rod portion and the first wiring branch portion, and a second bridging wiring connecting the second wiring rod portion and the second wiring branch portion.

[0020] The display device may further include: a third region extending in the first direction and located on a second side of the second region; and a fourth wiring including a fourth wiring rod portion extending in the second direction from the first side of the first region to the second side of the third region, and a fourth wiring branch portion branched from the fourth wiring rod portion and arranged in the third region, wherein the fourth wiring is electrically insulated from the first wiring and the second wiring.

[0021] The third wiring bar portion may extend from the first side of the first region to the second side of the third region in the second direction, and the third wiring branch portion may branch from the third wiring bar portion and be disposed in the third region.

[0022] The display device may further include a third light-emitting element having one end connected to the third wiring branch portion in the third region and the other end connected to the fourth wiring branch portion. According to another aspect of the embodiment, a method for manufacturing a display device includes: preparing a lower substrate including at least one ground wiring and an alignment wiring spaced apart from the ground wiring to face the ground wiring; and aligning the light-emitting element between the ground wiring and the alignment wiring by coating a coating solution containing the light-emitting element on at least a portion of the lower substrate and applying alternating current (AC) power to the alignment wiring, wherein the lower substrate includes a first region extending in a first direction, and a second region arranged side by side with the first region in a second direction intersecting the first direction, and the alignment wiring includes a first alignment wiring arranged in the first region and a second alignment wiring arranged in the second region.

[0023] The coating solution may be sequentially coated from a first side of the first region to a second side of the second region.

[0024] The ground wiring may include: a first ground wiring spaced apart from the first alignment wiring in the first region to face the first alignment wiring; and a second ground wiring spaced apart from the second alignment wiring in the second region to face the second alignment wiring.

[0025] The light emitting element may include a first light emitting element aligned between the first alignment wiring and the first ground wiring and a second light emitting element aligned between the second alignment wiring and the second ground wiring.

[0026] Aligning the light emitting element may include: at a first time, aligning the light emitting element between a first alignment wiring and a first ground wiring by coating a coating solution on at least a portion of the first area and applying AC power to the first alignment wiring; and at a second time different from the first time, aligning the light emitting element between a second alignment wiring and a second ground wiring by coating a coating solution on at least a portion of the second area and applying AC power to the second alignment wiring.

[0027] At the first time, AC power applied to the first alignment wiring may form a first electric field between the first alignment wiring and the first ground wiring, and the first light emitting element may have one end connected to the first alignment wiring and the other end connected to the first ground wiring.

[0028] At a second time, the first electric field can be removed, the AC power applied to the second alignment wiring can form a second electric field between the second alignment wiring and the second ground wiring, the second electric field has substantially the same intensity as the first electric field, and the second light-emitting element can have one end connected to the second alignment wiring and the other end connected to the second ground wiring.

[0029] At a third time different from the first time and the second time, the second electric field may be removed, and each of the first ground wiring and the second ground wiring may be partially patterned to form at least one segment.

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

[0031]

Technical Effect

[0032] The display device according to the embodiment includes different alignment wirings arranged in different alignment areas. Therefore, the alignment signal is applied only to the corresponding alignment area, thereby minimizing the voltage drop occurring during the alignment of the light emitting element. In addition, when the ink containing the light emitting element is applied, the electric field is formed only in the corresponding area. Therefore, the alignment degree of the light emitting element can be improved.

[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 perspective view of a display device according to an embodiment;

[0035] Figure 2 is a schematic block diagram of a display device according to an embodiment;

[0036] Figure 3 yes Figure 2 Circuit diagram of a pixel;

[0037] Figure 4 is a plan view of a display panel according to an embodiment;

[0038] Figure 5 is a schematic plan view of a display panel according to an embodiment;

[0039] Figure 6 yes Figure 4 A schematic enlarged view of a portion A of FIG.

[0040] Figure 7 It is along Figure 6 sectional views taken along lines II-I', II-II' and III-III';

[0041] Figure 8 is a schematic diagram of a light emitting element according to an embodiment;

[0042] Figures 9 to 13 is a schematic diagram illustrating a method of manufacturing a display panel according to an embodiment;

[0043] Fig.14is a circuit diagram schematically illustrating a capacitor formed in each alignment region during manufacture of a display panel according to an embodiment; and

[0044] Fig.15 is a plan view of a display panel according to another embodiment. DETAILED DESCRIPTION

[0045] The present invention will now be described more fully below with reference to the accompanying drawings, in which preferred embodiments of the present 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 present invention to those skilled in the art.

[0046] It will also 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.

[0047] 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.

[0048] Hereinafter, embodiments will be described with reference to the accompanying drawings.

[0049] Figure 1 is a perspective view of a display device according to an embodiment. Figure 2 is a schematic block diagram of a display device according to an embodiment. Figure 3 yes Figure 2 Circuit diagram of a pixel.

[0050] Reference Figures 1 to 3 The display device 1 according to the embodiment includes a display panel 10, an integrated driver circuit 20, a scan driver 30, a circuit board 40, and a power supply circuit 50. The integrated driver circuit 20 may include a data driver 21 and a timing controller 22.

[0051] In this specification, the terms "upper", "top", and "upper surface" represent the Z-axis direction, and the terms "lower", "bottom", and "lower surface" represent the direction opposite to the Z-axis direction. In addition, "left", "right", "upper", and "lower" represent directions when the display panel 10 is viewed in a plane. For example, "left" represents the direction opposite to the X-axis direction, "right" represents the X-axis direction, "upper" represents the Y-axis direction, and "lower" represents the direction opposite to the Y-axis direction.

[0052] The display panel 10 may be rectangular in plan view. Figure 1 As shown in , the display panel 10 may have a rectangular planar shape having a short side in a first direction (X-axis direction) and a long side in a second direction (Y-axis direction). Each corner where the short side extending in the first direction (X-axis direction) and the long side extending in the second direction (Y-axis direction) intersect may be a right angle, or may be a rounded corner with a predetermined curvature. The planar shape of the display panel 10 is not limited to a rectangular shape, but may also be other polygonal shapes, a circular shape, or an elliptical shape. In addition, although the display panel 10 is Figure 1 At least one side of the display panel 10 may be curved with a predetermined curvature.

[0053] The display panel 10 may be divided into a display area DA and a non-display area NDA disposed around the display area DA. The display area DA is an area where a plurality of pixels PX are formed to display an image. The display panel 10 may include data lines DL1 to DLm (where m is an integer equal to or greater than 2), scan lines SL1 to SLn (where n is an integer equal to or greater than 2), a first voltage line VDDL providing a first voltage, a second voltage line VSSL providing a second voltage, and pixels PX connected to the data lines DL1 to DLm and the scan lines SL1 to SLn.

[0054] Each of the pixels PX may display a color by including one or more light emitting elements 300 that emit light having a specific wavelength band. The light emitted from the light emitting elements 300 may be displayed through the display area DA of the display panel 10.

[0055] Each of the pixels PX may include a first sub-pixel PX1, a second sub-pixel PX2, and a third sub-pixel PX3. The first sub-pixel PX1 may emit light of a first color, the second sub-pixel PX2 may emit light of a second color, and the third sub-pixel PX3 may emit light of a third color. The first color may be red, the second color may be green, and the third color may be blue, but the present disclosure is not limited to this case. In addition, although in Figure 2Each of the pixels PX includes three sub-pixels, but the present disclosure is not limited to this case. That is, each of the pixels PX may also include four or more sub-pixels.

[0056] In an embodiment, sub-pixels PX displaying different colors may include light-emitting elements 300 that emit light of different colors. For example, a first sub-pixel PX1 displaying red may include a light-emitting element 300 that emits red light, a second sub-pixel PX2 displaying green may include a light-emitting element 300 that emits green light, and a third sub-pixel PX3 displaying blue may include a light-emitting element 300 that emits blue light. However, the present disclosure is not limited to this case. In some cases, pixels PX displaying different colors may include light-emitting elements 300 that emit light of the same color (e.g., blue), and a wavelength conversion layer or a color filter may be placed on the light emission path to achieve the color of each pixel PX. However, the present disclosure is not limited to this case. In some cases, adjacent pixels PX may emit light of the same color.

[0057] Each of the first subpixel PX1, the second subpixel PX2, and the third subpixel PX3 may be connected to at least one of the data lines DL1 to DLm, at least one of the scan lines SL1 to SLn, and the first voltage line VDDL. Figure 3 As shown in FIG. 1 , a light emitting element 300 , a plurality of transistors for supplying current to the light emitting element 300 , and at least one capacitor are included.

[0058] like Figure 3 As shown in , the transistor may include a driving transistor DT for supplying current to the light emitting element 300 and a switching transistor ST for supplying a data voltage to a gate electrode of the driving transistor DT. The driving transistor DT may include a gate electrode connected to a source electrode of the switching transistor ST, a source electrode connected to a first voltage line VDDL supplying a first voltage, and a drain electrode connected to a first electrode of the light emitting element 300. The switching transistor ST may include a gate electrode connected to a scan line SLk (where k is an integer satisfying 1≤k≤n), a source electrode connected to the gate electrode of the driving transistor DT, and a drain electrode connected to a data line DLj (where j is an integer satisfying 1≤j≤m).

[0059] The capacitor Cst is formed between the gate electrode and the source electrode of the driving transistor DT. The capacitor Cst stores a difference between a gate voltage and a source voltage of the driving transistor DT.

[0060] The driving transistor DT and the switching transistor ST may be formed as thin film transistors. Figure 3The driving transistor DT and the switching transistor ST are formed as P-type metal oxide semiconductor field effect transistors (MOSFETs), but the present disclosure is not limited to this case. The driving transistor DT and the switching transistor ST may also be formed as N-type MOSFETs. In this case, the source electrode and the drain electrode of each of the driving transistor DT and the switching transistor ST may be changed.

[0061] In addition, Figure 3 , each of the first subpixel PX1, the second subpixel PX2, and the third subpixel PX3 has a 2-transistor-1-capacitor (2T1C) structure including one driving transistor DT, one switching transistor ST, and one capacitor Cst. However, the present disclosure is not limited to this case. Each of the first subpixel PX1, the second subpixel PX2, and the third subpixel PX3 may also include a plurality of switching transistors ST and a plurality of capacitors Cst.

[0062] The integrated driver circuit 20 outputs signals and voltages for driving the display panel 10. To this end, the integrated driver circuit 20 may include a data driver 21 and a timing controller 22.

[0063] The data driver 21 receives the digital video data DATA and the source control signal DCS from the timing controller 22. The data driver 21 converts the digital video data DATA into analog data voltages according to the source control signal DCS, and supplies the analog data voltages to the data lines DL1 to DLm of the display panel 10.

[0064] The timing controller 22 receives digital video data DATA and timing signals from the host system. The timing signals may include a vertical synchronization signal, a horizontal synchronization signal, a data start signal, and a dot clock. The host system may be an application processor of a smart phone or a tablet PC, or may be a system-on-chip of a monitor or TV.

[0065] The timing controller 22 generates control signals for controlling operation timings of the data driver 21 and the scan driver 30. The control signals may include a source control signal DCS for controlling operation timings of the data driver 21 and a scan control signal for controlling operation timings of the scan driver 30.

[0066] The integrated driver circuit 20 may be disposed in the non-display area NDA on one side of the display panel 10. The integrated driver circuit 20 may be formed as an integrated circuit and mounted on the display panel 10 by a chip on glass (COG) method, a chip on plastic (COP) method, or an ultrasonic bonding method. However, the present disclosure is not limited to this case. For example, the integrated driver circuit 20 may be mounted on the circuit board 40 instead of on the display panel 10.

[0067] In addition, despite the Figure 2 The integrated driver circuit 20 includes a data driver 21 and a timing controller 22, but the present disclosure is not limited to this case. The data driver 21 and the timing controller 22 may also be formed as separate integrated circuits instead of being integrated into one integrated circuit. In this case, the data driver 21 may be mounted on the display panel 10 by a COG method, a COP method, or an ultrasonic bonding method, and the timing controller 22 may be mounted on the circuit board 40.

[0068] The scan driver 30 receives a scan control signal SCS from the timing controller 22. The scan driver 30 generates a scan signal according to the scan control signal SCS, and provides the scan signal to the scan lines SL1 to SLn of the display panel 10. The scan driver 30 may include a plurality of transistors, and may be formed in the non-display area NDA of the display panel 10. Alternatively, the scan driver 30 may be formed as an integrated circuit. In this case, the scan driver 30 may be mounted on a gate flexible film attached to the other side of the display panel 10.

[0069] The circuit board 40 may be attached to a pad provided at the edge of the display panel 10 through an anisotropic conductive film. Thus, the leads of the circuit board 40 may be electrically connected to the pad. The circuit board 40 may be a flexible printed circuit board, a printed circuit board, or a flexible film (such as a chip on film). The circuit board 40 may be bent toward the bottom surface of the display panel 10. In this case, one side of the circuit board 40 may be attached to the edge of the display panel 10, and the other side of the circuit board 40 may be provided below the display panel 10 and connected to a system board on which a host system is mounted.

[0070] The power supply circuit 50 may generate a voltage necessary for driving the display panel 10 from the main power received from the system board, and provide the voltage to the display panel 10. For example, the power supply circuit 50 may generate a first voltage VDD and a second voltage VSS for driving the light emitting element 300 of the display panel 10 from the main power, and provide the first voltage VDD and the second voltage VSS to a first voltage line VDDL and a second voltage line VSSL of the display panel 10. In addition, the power supply circuit 50 may generate and provide a driving voltage for driving the integrated driver circuit 20 and the scan driver 30 from the main power.

[0071] Despite Figure 1 The power supply circuit 50 is formed as an integrated circuit and mounted on the circuit board 40 , but the embodiments of the present disclosure are not limited to this case. For example, the power supply circuit 50 may also be integrated into the integrated driver circuit 20 .

[0072] Figure 4 is a plan view of a display panel according to an embodiment. Figure 4 yes Figure 1 An enlarged plan view of a display panel of a display device shown in FIG.

[0073] Reference Figure 4 , the display panel 10 includes a display area DA and a non-display area NDA. A plurality of pixels PX may be provided in the display area DA, and each of the pixels PX may include a plurality of electrodes 210 and 220 and a light emitting element 300 aligned between the electrodes 210 and 220. The pixels PX may be arranged in a first direction D1 and a second direction D2, the first direction D1 being a horizontal direction in the figure, and the second direction D2 being a vertical direction. Figure 4 In part A of FIG. 1 , three sub-pixels PX1 to PX3 are shown as an example. However, it is obvious that the display panel 10 may include more pixels PX or more sub-pixels PX1 to PX3 .

[0074] also, Figure 4 The pixel PX may be divided into a plurality of pixels, each of which forms a pixel PX. Figure 4 Instead of being arranged parallel to each other in the first direction D1 and the second direction D2 as in the embodiment, they may also be arranged in a different structure, such as a zigzag structure. Figure 6 Each pixel PX or sub-pixel PX1 , PX2 , or PX3 is described in more detail.

[0075] The non-display area NDA is an area where no pixel PX is provided, and may be defined as an area of ​​the display panel 10 other than the display area DA. The non-display area NDA may be covered by a specific member so as not to be visible from the outside of the display panel 10. Various members for driving the light emitting element 300 provided in the display area DA may be provided in the non-display area NDA. Figure 4 As shown in FIG. 1 , a plurality of pads DP, AP, and PP may be disposed in the non-display area NDA on one side of the display area DA of the display panel 10 , for example, in a portion of the non-display area NDA located on a lower side of the display area DA in a plan view.

[0076] The pads may include a data transmission pad DP, a power pad PP, and a signal application pad AP. The data transmission pad DP may be connected to a plurality of data lines DL of the pixels PX extending to the display area DA. The data transmission pad DP may transmit data signals for driving the pixels PX to the pixels PX through the data lines DL, respectively. One data transmission pad DP may be connected to one data line DL, and the number of data transmission pads DP included in the display panel 10 may be equal to the number of sub-pixels arranged along the first direction D1 of the display area DA.

[0077] The power pad PP may be connected to a ground wiring 600 to be described later. When the display panel 10 is driven, the power pad PP may transmit a power supply voltage through the ground wiring 600, and when the display panel 10 is manufactured, the power pad PP may be grounded. The signal application pad AP may be connected to an alignment wiring 700 to be described later, and may receive an alignment signal when the display panel 10 is manufactured. The ground wiring 600 and the alignment wiring 700 may form an electric field induced capacitance in the display area DA in response to the alignment signals received from the power pad PP and the signal application pad AP, respectively. Therefore, the light emitting element 300 coated on the display area DA may be aligned between the ground wiring 600 and the alignment wiring 700.

[0078] In addition, although not shown in the drawings, the display panel 10 may further include a first voltage line VDDL and a second voltage line VSSL for applying a first voltage VDD and a second voltage VSS to each pixel PX or sub-pixel PX1, PX2, or PX3. One side of each of the first voltage line VDDL and the second voltage line VSSL may be connected to another pad (not shown) so as to apply a predetermined voltage to each pixel PX or sub-pixel PX1, PX2, or PX3. For ease of description, the first voltage line VDDL and the second voltage line VSSL are not shown in the following drawings.

[0079] A plurality of wirings may be provided in portions of an area other than an area where the pads DP, AP, and PP are provided in the non-display area NDA, for example, portions NDA1 and NDA2 provided on the left and right sides of the display area DA in a plan view of the non-display area NDA (see FIG. Figure 5 )middle.

[0080] The wirings include at least one ground wiring 600 and at least one alignment wiring 700. The at least one ground wiring 600 and the at least one alignment wiring 700 spaced apart from the ground wiring 600 are disposed in the non-display area NDA of the display panel 10. They may apply a predetermined alignment signal to align the light emitting elements 300 disposed in the display area DA of the display panel 10.

[0081] The ground wiring 600 may include one or more ground wiring stem portions 600S extending in the second direction D2 , and one or more ground wiring branch portions 600B branched from the ground wiring stem portion 600S and extending in the first direction D1 .

[0082] In the drawings, the ground wiring rod portion 600S may be disposed outside the display area DA, for example, in the non-display area NDA located on both sides of the display area DA in the first direction D1. Figure 4In the embodiment, the ground wiring rod portions 600S are respectively disposed in the non-display area NDA on both sides of the display area DA so that a total of two wirings form a pair. The ground wiring rod portions 600S forming a pair may have a symmetrical structure with respect to the display area DA, but the present disclosure is not limited to this case.

[0083] One or more ground wiring branch portions 600B are branched from each of the ground wiring rod portions 600S. The ground wiring branch portions 600B may branch from the ground wiring rod portions 600S disposed in the non-display area NDA toward the display area DA, and extend in the first direction D1. That is, the ground wiring branch portions 600B may be disposed in the display area DA. In other words, the ground wiring 600 may include a pair of ground wiring rod portions 600S and one or more ground wiring branch portions 600B disposed between the ground wiring rod portions 600S. However, the present disclosure is not limited to this case, and the display panel 10 may also include more ground wiring rod portions 600S, and in some cases, the ground wiring rod portions 600S may also be disposed in the display area DA.

[0084] In addition, as shown in the figure, each ground wiring branch portion 600B may extend in the first direction D1, and one or more segments may be arranged at predetermined intervals to form a pattern. Such a structure of each ground wiring branch portion 600B may be formed by patterning the ground wiring branch portion 600B into one or more segments when manufacturing the display panel 10.

[0085] In other words, the ground wiring branch portion 600B may branch from the ground wiring rod portion 600S, and both ends of each ground wiring branch portion 600B may extend in the first direction D1 to be substantially connected to the ground wiring rod portion 600S. Then, each ground wiring branch portion 600B may be patterned into a plurality of segments arranged in a row through an additional process. This will be described in more detail later.

[0086] The alignment wire 700 includes an alignment wire rod portion 700S extending in the second direction D2 and an alignment wire branch portion 700B branched from the alignment wire rod portion 700S and extending in the first direction D1.

[0087] In the drawings, the alignment wiring rod portion 700S may be disposed outside the display area DA, for example, in the non-display area NDA located on both sides of the display area DA in the first direction D1. The alignment wiring rod portion 700S may extend in the second direction D2 and may be spaced apart from the ground wiring rod portion 600S. That is, the alignment wiring rod portion 700S may be disposed substantially parallel to the ground wiring rod portion 600S. In addition, the alignment wiring rod portions 700S may be disposed on both sides of the display area DA in the first direction D1, respectively. Figure 4 In the embodiment, a total of six alignment wiring rod portions 700S are provided in the non-display area NDA, three on each of the two sides. Figure 4 Three pairs of alignment wiring rod portions 700S are provided on the display panel 10. As in the ground wiring 600, two alignment wiring rod portions 700S in the alignment wiring 700 may form a pair, and the display panel 10 may include one or more pairs of alignment wiring rod portions 700S. The alignment wiring rod portions 700S forming one or more pairs may be symmetrically arranged with respect to the display area DA.

[0088] However, the present disclosure is not limited to this case, and the number of alignment wire rod portions 700S provided in the display panel 10 may vary. According to an embodiment, the display panel 10 may include two or more alignment wire rod portions 700S, and the alignment wire rod portions 700S may form at least two pairs of alignment wires 700.

[0089] The alignment wiring bar portion 700S and the ground wiring bar portion 600S are spaced apart from each other. The gaps therebetween need not necessarily be equal and may also be different in some cases. For example, a wiring disposed at a position farther from the display area DA in the non-display area NDA may be spaced apart from an adjacent wiring by a larger gap. Figure 4 In the embodiment, each ground wiring rod portion 600S is disposed on one side of the non-display area NDA adjacent to the display area DA, and the alignment wiring rod portion 700S is disposed adjacent to the other side of the non-display area NDA. However, the present disclosure is not limited to this case, and the alignment wiring rod portion 700S may also be disposed on one side of the non-display area NDA adjacent to the display area DA.

[0090] One or more alignment wiring branch portions 700B are branched from each of the alignment wiring rod portions 700S. The alignment wiring branch portions 700B may branch from the alignment wiring rod portion 700S disposed in the non-display area NDA toward the display area DA and extend in the first direction D1. That is, the alignment wiring branch portions 700B may be disposed in the display area DA.

[0091] Unlike the ground wiring branch portion 600B, each of the alignment wiring branch portions 700B may extend in the first direction D1 in the display area DA to form a wiring. That is, when manufacturing the display panel 10, each of the alignment wiring branch portions 700B may not be patterned into one or more segments. Therefore, both ends of each alignment wiring branch portion 700B may extend in the first direction D1 and may be electrically connected to the alignment wiring rod portion 700S. However, the present disclosure is not limited to this case, and each of the alignment wiring branch portions 700B may also be patterned into one or more segments similar to the ground wiring branch portion 600B.

[0092] The alignment wiring branch portion 700B is spaced apart from the ground wiring branch portion 600B to face the ground wiring branch portion 600B in the display area DA. Each ground wiring branch portion 600B and each alignment wiring branch portion 700B may include a plurality of branches extending in the second direction D2. One or more light emitting elements 300 may be aligned between these branches, and both ends of each of the light emitting elements 300 may be connected to these branches, respectively. As will be described later, the branches of each ground wiring branch portion 600B and the branches of each alignment wiring branch portion 700B may form the first electrode 210 and the second electrode 220 of the light emitting element 300.

[0093] The pads PP and AP to which a predetermined electric signal is applied can be connected to the corresponding sides of the ground wiring rod portion 600S and the alignment wiring rod portion 700S. The ground wiring rod portion 600S can be connected to the power pad PP to receive the power signal or can be grounded. The alignment wiring rod portion 700S can be connected to the signal application pad AP to receive the alignment signal. As will be described later, the light-emitting element 300 arranged in the display area DA of the display panel 10 can receive the alignment signal from the ground wiring 600 and the alignment wiring 700, and can be aligned by dielectric electrophoresis. Here, any one of the ground wiring 600 and the alignment wiring 700 can be grounded, and the other can receive alternating current (AC) power for the alignment signal. The received AC power can form an electric field induced capacitance between the ground wiring 600 and the alignment wiring 700, and the dielectric electrophoresis force transmitted by the capacitance can be used to align the light-emitting element 300.

[0094] In the alignment wiring 700 to which the AC power is applied, the voltage of the AC power may decrease from the side connected to the signal application pad AP toward the other side. When the voltage difference between the ground wiring 600 and the alignment wiring 700 is small, sufficient dielectrophoretic force for aligning the light emitting element 300 may not be delivered. In addition, when a large-area display panel 10 is manufactured, the time for applying the AC power may be delayed depending on the area in the display panel 10, and the amount of current required for aligning the light emitting element 300 may also increase.

[0095] On the other hand, the display panel 10 according to the embodiment may include a plurality of alignment wirings 710 to 730 extending from one side connected to the signal applying pad AP toward the other side with different lengths. A plurality of alignment areas AA (see Figure 5 ), and the display panel 10 may include a plurality of alignment wirings 710 to 730 extending from one side of the display panel 10 to the alignment area AA, respectively. Therefore, when the light emitting element 300 is aligned in each alignment area AA during the manufacture of the display panel 10, an alignment signal may be applied through the alignment wirings 710 to 730 extending to different alignment areas AA. The alignment wirings 710 to 730 may remove unnecessary resistance, thereby minimizing a voltage drop of the alignment signal applied to the alignment area AA.

[0096] According to an embodiment, the alignment wiring 700 may include a first alignment wiring 710, a second alignment wiring 720, and a third alignment wiring 730 extending from one side of the display panel 10 to the other side and having different lengths. The first alignment wiring 710, the second alignment wiring 720, and the third alignment wiring 730 may include a first alignment wiring rod portion 710S, a second alignment wiring rod portion 720S, and a third alignment wiring rod portion 730S, and a first alignment wiring branch portion 710B, a second alignment wiring branch portion 720B, and a third alignment wiring branch portion 730B, respectively. The arrangement of these components is as described above.

[0097] Respective sides of the first alignment wiring bar portion 710S, the second alignment wiring bar portion 720S, and the third alignment wiring bar portion 730S may be connected to signal applying pads AP, for example, first signal applying pads AP1, second signal applying pads AP2, and third signal applying pads AP3 disposed on one side of the display panel 10. The alignment wiring bar portions 710S to 730S may receive different alignment signals from different signal applying pads AP1 to AP3, respectively.

[0098] The alignment wiring rod portions 710S to 730S may include one or more wirings having different lengths in the non-display area NDA and extending in the second direction D2. That is, the other sides of the alignment wiring rod portions 710S to 730S may extend different lengths in the second direction D2. The alignment wiring rod portions 710S to 730S different from each other may respectively include alignment wiring branch portions 710B to 730B branched toward the display area DA and extending in the first direction D1.

[0099] Each of the alignment wiring rod portions 710S to 730S may be disposed on each of the two sides of the display area DA to form a pair. In addition, each pair of alignment wiring rod portions 710S, 720S, or 730S may be electrically connected by each alignment wiring branch portion 710B, 720B, or 730B extending in the first direction D1. Figure 5 The structure of the alignment wirings 710 to 730 is described in detail.

[0100] Figure 5 is a schematic plan view of a display panel according to an embodiment. Figure 5 Partially shown Figure 4 The display area DA and the non-display area NDA of the display panel 10 are shown, and the arrangement structure of the ground wiring 600 and the alignment wiring 700 is schematically shown. In addition, Figure 5 shows a 90 degree rotation Figure 4 Therefore, it can be understood that Figure 5 The first direction D1 is a vertical direction in a plan view, and the second direction D2 is a horizontal direction in a plan view.

[0101] Specifically, in Figure 5 , only the ground wiring 600, the alignment wiring 700, and the light emitting element 300 are shown, that is, only the structures of some of the components provided in the display panel 10 are shown in detail. The arrangement of the ground wiring 600 and the alignment wiring 700 will now be described in detail.

[0102] Reference Figure 5 , the display panel 10 may include a display area DA extending in a second direction D2 (horizontal direction in a plan view), a first non-display area NDA1 located above the display area DA in a plan view, and a second non-display area NDA2 located below the display area DA in a plan view. The first non-display area NDA1 and the second non-display area NDA2 may be understood as being located respectively Figure 4 The non-display area NDA on the left and right sides.

[0103] In addition, the display panel 10 may include a plurality of alignment areas AA extending in the first direction D1 and arranged in the second direction D2. Figure 5 , the first, second, and third alignment areas AA1, AA2, and AA3 may be defined from the left side of the display panel 10 in a plan view, for example, from one side where the pads PP and AP are disposed toward the other side in the second direction D2.

[0104] Hereinafter, a direction in which the pads PP and AP are arranged relative to the center of each alignment area AA is defined as a "first side" of each alignment area AA, and an opposite direction is defined as a "second side". Figure 5 , the pads PP and AP may be disposed on a first side of the first alignment area AA1, and the second alignment area AA2 may be disposed on a second side of the first alignment area AA1. In addition, the first alignment area AA1 may be disposed on a first side of the second alignment area AA2, and the third alignment area AA3 may be disposed on a second side of the second alignment area AA2.

[0105] The alignment area AA is not an area distinguished by a predetermined member provided at a boundary therebetween, but an area distinguished by the alignment wiring rod portions 710S to 730S having different lengths. Each alignment area AA may overlap the display area DA and the non-display area NDA of the display panel 10. Figure 5 As shown in , in a plan view, each alignment area AA of the display panel 10 may overlap the display area DA and extend in the first direction D1 to overlap the non-display area NDA.

[0106] As an exemplary embodiment, Figure 5 , the display panel 10 includes three different alignment wirings 710 to 730 to define three alignment areas AA1 to AA3. However, the present disclosure is not limited to this case, and it is obvious that more alignment areas AA can be defined. That is, when the alignment wirings 710 to 730 include a greater number of wirings with different lengths, a greater number of alignment areas AA can be defined.

[0107] In addition, Figure 5 In the embodiment, the alignment area AA extends in the first direction D1 to have a linear shape. In another example, each alignment area AA may be divided in the first direction D1, and thus a plurality of alignment areas AA may also be arranged in the first direction D1. That is, the alignment area AA may be defined as a substantially grid shape. This will be described in detail in another embodiment.

[0108] One ground wiring rod portion 600S may be provided in each of the first non-display area NDA1 and the second non-display area NDA2 to form a pair. One side of each of the ground wiring rod portions 600S is connected to the power pad PP, and the other side extends in the second direction D2. The other side of each of the ground wiring rod portions 600S may extend to reach the third alignment area AA3. That is, each of the ground wiring rod portions 600S may be provided above all alignment areas AA1 to AA3 of the display panel 10. The ground wiring rod portion 600S provided in the first non-display area NDA1 may be understood as a first sub-ground wiring rod portion, and the ground wiring rod portion 600S provided in the second non-display area NDA2 may be understood as a second sub-ground wiring rod portion.

[0109] The ground wiring branch portion 600B may branch from the ground wiring rod portion 600S toward the display area DA and extend in the first direction D1. The ground wiring branch portion 600B may be indiscriminately disposed in each of the alignment areas AA1 to AA3. That is, the ground wiring branch portion 600B may be arranged at predetermined intervals in the first alignment area AA1, the second alignment area AA2, and the third alignment area AA3.

[0110] Each of the first alignment wiring rod portion 710S, the second alignment wiring rod portion 720S, and the third alignment wiring rod portion 730S is disposed in each of the first non-display area NDA1 and the second non-display area NDA2 to form a pair. Figure 5 The display panel 10 is provided with three pairs of alignment wiring rod portions 710S to 730S. The alignment wiring rod portions 710S to 730S are spaced apart from each other and are also spaced apart from the ground wiring rod portion 600S. The first alignment wiring rod portion 710S, the second alignment wiring rod portion 720S and the third alignment wiring rod portion 730S arranged in the first non-display area NDA1 can be respectively understood as the first sub-alignment wiring rod portion, the third sub-alignment wiring rod portion and the fifth sub-alignment wiring rod portion, and the first alignment wiring rod portion 710S, the second alignment wiring rod portion 720S and the third alignment wiring rod portion 730S arranged in the second non-display area NDA2 can be respectively understood as the second sub-alignment wiring rod portion, the fourth sub-alignment wiring rod portion and the sixth sub-alignment wiring rod portion. The ground wiring rod portion 600S and the alignment wiring rod portions 710S to 730S will be described below, but they are not called sub-wiring rod portions.

[0111] In the drawings, the ground wiring rod portion 600S is disposed on one side adjacent to the display area DA in each of the first non-display area NDA1 and the second non-display area NDA2, and the first alignment wiring rod portion 710S, the second alignment wiring rod portion 720S, and the third alignment wiring rod portion 730S are disposed toward the opposite side. As described above, the present disclosure is not limited to this case, and the arrangement of the above components and the gaps therebetween may vary.

[0112] The alignment wiring bar portions 710S to 730S may extend toward one side of the display panel 10 and may be connected to different signal applying pads AP1 to AP3. The first alignment wiring bar portion 710S is connected to the first signal applying pad AP1, the second alignment wiring bar portion 720S is connected to the second signal applying pad AP2, and the third alignment wiring bar portion 730S is connected to the third signal applying pad AP3. The signal applying pads AP1 to AP3 may be individually driven to apply different signals to the alignment wiring bar portions 710S to 730S, respectively.

[0113] In addition, the alignment rod portions 710S to 730S may extend from a first side of the first alignment area AA1 toward a second side of the third alignment area AA3 in the second direction D2 and may have different lengths.

[0114] Each of the third alignment wiring bar portions 730S has one side connected to the third signal applying pad AP3, and the other side extending from the first alignment area AA1 in the second direction D2. The other side of each of the third alignment wiring bar portions 730S may extend to reach the second alignment area AA2 and the third alignment area AA3. That is, each of the third alignment wiring bar portions 730S may be disposed above the first alignment area AA1, the second alignment area AA2, and the third alignment area AA3.

[0115] The first alignment wiring bar portion 710S and the second alignment wiring bar portion 720S may have one side connected to the first signal applying pad AP1 and the second signal applying pad AP2, respectively, and the other side extending from the first alignment area AA1 in the second direction D2. On the other hand, the other side of each of the first alignment wiring bar portions 710S may extend to the first alignment area AA1, and the other side of each of the second alignment wiring bar portions 720S may extend to the second alignment area AA2. That is, each of the first alignment wiring bar portions 710S may be disposed in the first alignment area AA1, and each of the second alignment wiring bar portions 720S may be disposed above the first alignment area AA1 and the second alignment area AA2.

[0116] The third alignment wiring branch portion 730B branches from the third alignment wiring rod portion 730S overlapping the third alignment area AA3 toward the display area DA. That is, the third alignment wiring branch portion 730B may be disposed only in the third alignment area AA3, but not in the first alignment area AA1 and the second alignment area AA2, and may be spaced apart from the ground wiring branch portion 600B disposed in the third alignment area AA3 to face the ground wiring branch portion 600B.

[0117] The first alignment wiring branch portion 710B branches from the first alignment wiring rod portion 710S overlapping the first alignment area AA1 toward the display area DA. The second alignment wiring branch portion 720B branches from the second alignment wiring rod portion 720S overlapping the second alignment area AA2 toward the display area DA. That is, the first alignment wiring branch portion 710B may be disposed only in the first alignment area AA1, but not in the second alignment area AA2 and the third alignment area AA3, and may be spaced apart from the ground wiring branch portion 600B disposed in the first alignment area AA1 to face the ground wiring branch portion 600B. In addition, the second alignment wiring branch portion 720B may be disposed only in the second alignment area AA2, but not in the first alignment area AA1 and the third alignment area AA3, and may be spaced apart from the ground wiring branch portion 600B disposed in the second alignment area AA2 to face the ground wiring branch portion 600B.

[0118] The path of the first alignment wiring branch portion 710B, the second alignment wiring branch portion 720B or the third alignment wiring branch portion 730B of each branch from the alignment wiring rod portion 710S to 730S may be blocked by another alignment wiring rod portion 710S, 720S or 730S, or blocked by the ground wiring rod portion 600S. In this case, various paths for wiring can be formed in the same layer to ensure the path of the alignment wiring branch portions 710B to 730B. However, this may complicate the arrangement of the wiring and cause crosstalk.

[0119] Therefore, the alignment wirings 710 to 730 may further include a bridge wiring BL electrically connecting the alignment wiring rod portions 710S to 730S disposed in the non-display areas NDA1 and NDA2 to the alignment wiring branch portions 710B to 730B disposed in the display area DA.

[0120] In an example, the first alignment wiring rod portion 710S can be electrically connected to the first alignment wiring branch portion 710B through the first bridge wiring BL1 in the first alignment area AA1. The first bridge wiring BL1 can partially overlap with the ground wiring rod portion 600S. The second alignment wiring rod portion 720S can be electrically connected to the second alignment wiring branch portion 720B through the second bridge wiring BL2 in the second alignment area AA2. The second bridge wiring BL2 can partially overlap with the ground wiring rod portion 600S. The third alignment wiring rod portion 730S can be electrically connected to the third alignment wiring branch portion 730B through the third bridge wiring BL3 in the third alignment area AA3. The third bridge wiring BL3 can partially overlap with the ground wiring rod portion 600S.

[0121] In addition, although not shown in the drawings, the alignment wiring rod portions 710S to 730S, the alignment wiring branch portions 710B to 730B, and the bridge wiring BL may be arranged in different wiring layers. The alignment wiring rod portions 710S to 730S and the alignment wiring branch portions 710B to 730B may be arranged in a first wiring layer, and the bridge wiring BL may be arranged in a second wiring layer different from the first wiring layer. The bridge wiring BL arranged in the second wiring layer may be connected to the alignment wiring rod portions 710S to 730S and the alignment wiring branch portions 710B to 730B through predetermined contact holes.

[0122] However, the present disclosure is not limited to this case. As described above, the arrangement structure of the ground wiring rod portion 600S and the alignment wiring rod portions 710S to 730S in the non-display area NDA may vary. Therefore, other bridge wirings BL may also be included.

[0123] In summary, the ground wiring branch portion 600B may be disposed over the entire area of ​​the display panel 10. The ground wiring branch portion 600B may be disposed without regard to the alignment area AA defined by the alignment wiring rod portions 710S to 730S. On the other hand, each of the alignment wiring branch portions 710B to 730B may be disposed in any one of the alignment areas AA defined by the alignment wiring rod portions 710S to 730S. When each of the alignment wiring rod portions 710S to 730S extending from one side connected to the signal application pad AP to the other side terminates in one area, the alignment wiring branch portion 710B, 720B, or 730B may be disposed only in the alignment area AA where the other side of each of the alignment wiring rod portions 710S to 730S terminates.

[0124] That is, the ground wiring branch portion 600B is placed in the first alignment area AA1 to face the first alignment wiring branch portion 710B. In addition, the ground wiring branch portion 600B may be placed in the second alignment area AA2 to face the second alignment wiring branch portion 720B and in the third alignment area AA3 to face the third alignment wiring branch portion 730B. As described above, the ground wiring branch portion 600B and the alignment wiring branch portions 710B to 730B may include branches extending in the second direction D2, and the light emitting element 300 may be disposed between the branches.

[0125] As described above, when the display panel 10 is manufactured, a coating solution S (see Fig.10 ) is coated on the ground wiring 600 and the alignment wirings 710 to 730. An alignment signal is applied to the ground wiring 600 and the alignment wirings 710 to 730, and a capacitance is formed by an electric field. The capacitance induced by the electric field can apply a dielectrophoretic force to the light emitting element 300 in the coating solution S, thereby aligning the light emitting element 300 between the wirings.

[0126] Here, the alignment wiring branch portions 710B to 730B and the ground wiring branch portion 600B may function as wiring resistances. The voltage of the alignment signal applied from each of the signal application pads AP1 to AP3 connected to the corresponding sides of the alignment wirings 710 to 730 may be reduced toward the other side of the display panel 10 (e.g., toward the third alignment area AA3) due to resistance.

[0127] However, the display panel 10 according to the embodiment may apply an alignment signal through different alignment wires 710 , 720 or 730 according to the alignment area AA and remove unnecessary alignment wire branch portions 710B to 730B from the alignment wires 710 to 730 , thereby minimizing the resistance value.

[0128] For example, when the light emitting element 300 is aligned in the second alignment area AA2, the ground wiring 600 may be grounded, and an alignment signal may be applied through the second alignment wiring 720. The second alignment wiring 720 includes a second alignment wiring rod portion 720S extending from one side of the display panel 10 to the second alignment area AA2 and a second alignment wiring branch portion 720B disposed only in the second alignment area AA2. The second signal application pad AP2 connected to the corresponding side of the second alignment wiring rod portion 720S may apply an alignment signal for aligning the light emitting element 300, and an electric field induced capacitance may be formed only in the second alignment area AA2 through the second alignment wiring branch portion 720B. Since the second alignment wiring branch portion 720B is not disposed in the first alignment area AA1 and the third alignment area AA3, an alignment signal is not applied to the first alignment area AA1 and the third alignment area AA3. That is, when the light emitting element 300 is aligned in the second alignment area AA2, unnecessary capacitance is not formed in the first alignment area AA1 and the third alignment area AA3, and a voltage drop of the alignment signal transmitted from the second signal application pad AP2 may be minimized. That is, a voltage of sufficient intensity can be applied even to a region located away from the signal applying pad AP.

[0129] In the first alignment area AA1, the light emitting element 300 has a corresponding end connected to the ground wiring branch portion 600B and another corresponding end connected to the first alignment wiring branch portion 710B. On the other hand, in the second alignment area AA2, the light emitting element 300 may have a corresponding end connected to the ground wiring branch portion 600B and another corresponding end connected to the second alignment wiring branch portion 720B, and in the third alignment area AA3, the light emitting element 300 may have a corresponding end connected to the ground wiring branch portion 600B and another corresponding end connected to the third alignment wiring branch portion 730B.

[0130] Therefore, when manufacturing the display panel 10 according to the embodiment, the voltage drop of the alignment signal transmitted through the signal applying pad AP can be minimized, and a voltage having a strength sufficient to align the light emitting element 300 in the entire area of ​​the display panel 10 can be applied. In addition, even when manufacturing a large-area display panel 10, the maximum current value required to align the light emitting element 300 can be reduced.

[0131] Figure 6 yes Figure 4 Schematic enlarged view of portion A of FIG.

[0132] Reference Figure 6, the display panel 10 may include a plurality of electrodes 210 and 220 and a plurality of light emitting elements 300. At least a portion of each of the electrodes 210 and 220 may be disposed in each pixel PX and electrically connected to the light emitting element 300, and an electrical signal may be applied so that the light emitting element 300 emits light of a specific color. Hereinafter, the pixel PX may also be interpreted as a sub-pixel PX1, PX2, or PX3.

[0133] In addition, at least a portion of each of the electrodes 210 and 220 may be used to form an electric field in each pixel PX so as to align the light emitting element 300. Specifically, when aligning the light emitting elements 300 emitting light of different colors in a plurality of pixels PX, it is necessary to accurately align the different light emitting elements 300 in the pixels PX, respectively. When aligning the light emitting elements 300 using dielectrophoresis, the display panel 10 may be coated with a solution containing the light emitting elements 300, and AC power may be applied to the display panel 10 to form an electric field induced capacitance. Therefore, a dielectrophoretic force may be applied to the light emitting element 300, thereby aligning the light emitting element 300.

[0134] The electrodes 210 and 220 may include a first electrode 210 and a second electrode 220. In an exemplary embodiment, the first electrode 210 may be a separate pixel electrode provided in each pixel PX, and the second electrode 220 may be a common electrode formed over a plurality of pixels PX. Any one of the first electrode 210 and the second electrode 220 may be an anode of each light emitting element 300, and the other may be a cathode of each light emitting element 300. However, the present disclosure is not limited to this case, and vice versa.

[0135] Each of the first electrode 210 and the second electrode 220 may include an electrode rod portion 210S or 220S extending in a first direction D1 and at least one electrode branch portion 210B or 220B extending and branching from the electrode rod portion 210S or 220S in a second direction D2 intersecting the first direction D1.

[0136] Specifically, the first electrode 210 may include a first electrode rod portion 210S extending in the first direction D1 and at least one first electrode branch portion 210B branching from the first electrode rod portion 210S and extending in the second direction D2. Although not shown in the drawings, the first electrode rod portion 210S may have a contact with the signal applying pad AP (see Figure 4 ) and the other end extending in the first direction D1 and electrically insulated between pixels PX. The signal applying pad AP may be connected to the display panel 10 or an external power source to apply an electrical signal to the first electrode rod portion 210S or provide AC power when the light emitting element 300 is aligned.

[0137] Either of the electrode rod portions 210S and 220S of the electrodes 210 and 220 may be oriented toward Figure 4 and Figure 5 The aligned wiring pole section 700S extends and connects to the Figure 4 and Figure 5 The alignment wiring rod portion 700S may be provided at the same time, and the other may extend toward the ground wiring rod portion 600S, but may terminate at a position spaced apart from the ground wiring rod portion 600S. Figure 6 Although not shown in the figure, in the first direction D1 along which the electrode rod portions 210S and 220S extend, the ground wiring rod portion 600S and the alignment wiring rod portion 700S may be arranged to extend in the second direction D2. That is, Figure 6 The electrode rod portions 210S and 220S shown in FIG. 2 may be Figure 5 Any one of the ground wiring branch portion 600B and the alignment wiring branch portion 700B shown in FIG.

[0138] In an example, the first electrode rod portion 210S may extend toward the ground wiring rod portion 600S, but may terminate at a position spaced apart from the ground wiring rod portion 600S, and the second electrode rod portion 220S may extend toward each alignment wiring rod portion 700S and may be connected to each alignment wiring rod portion 700S. In this case, the first electrode rod portion 210S may be a part of the ground wiring branch portion 600B, and the second electrode rod portion 220S may be any one of the alignment wiring branch portions 700B. However, the present disclosure is not limited to this case.

[0139] The first electrode rod portion 210S of one pixel PX may be on substantially the same straight line as the first electrode rod portion 210S of adjacent pixels PX (e.g., adjacent pixels PX in the first direction D1) belonging to the same row. In other words, both ends of the first electrode rod portion 210S of one pixel PX may terminate between the pixels PX, but the first electrode rod portions 210S of adjacent pixels PX may be aligned in the extension direction of the first electrode rod portion 210S of one pixel PX. This arrangement of the first electrode rod portion 210S may be achieved by forming one rod electrode during the manufacturing process, and then cutting the rod electrode using a laser or the like after the alignment process of the light emitting element 300. Therefore, the plurality of first electrode rod portions 210S respectively disposed in the plurality of pixels PX may apply different electrical signals to their corresponding first electrode branch portions 210B, and the first electrode branch portions 210B may be driven individually.

[0140] The first electrode branch portion 210B may branch from at least a portion of the first electrode rod portion 210S and extend in the second direction D2 to terminate at a position spaced apart from the second electrode rod portion 220S facing the first electrode rod portion 210S. That is, the first electrode branch portion 210B disposed in each pixel PX may have one end connected to the first electrode rod portion 210S and the other end spaced apart from the second electrode rod portion 220S. Since the first electrode branch portion 210B is connected to the first electrode rod portion 210S electrically insulated in each pixel PX, different electrical signals may be applied to the first electrode branch portion 210B of each pixel PX.

[0141] In addition, one or more first electrode branch portions 210B may be provided in each pixel PX. Figure 6 In the embodiment, two first electrode branch portions 210B are provided, and a second electrode branch portion 220B is provided between the first electrode branch portions 210B. However, the present disclosure is not limited to this case, and more first electrode branch portions 210B may be provided. In this case, the first electrode branch portion 210B may be alternately arranged with a plurality of second electrode branch portions 220B and spaced apart from the second electrode branch portion 220B, and a plurality of light-emitting elements 300 may be provided between the first electrode branch portion 210B and the second electrode branch portion 220B. In some embodiments, the second electrode branch portion 220B may be provided between the first electrode branch portions 210B. Therefore, each pixel PX may have a symmetrical structure relative to the second electrode branch portion 220B. However, the present disclosure is not limited to this case.

[0142] The second electrode 220 may include a second electrode rod portion 220S and at least one second electrode branch portion 220B, the second electrode rod portion 220S extending in the first direction D1 and spaced apart from the first electrode rod portion 210S to face the first electrode rod portion 210S, and the second electrode branch portion 220B branching from the second electrode rod portion 220S, extending in the second direction D2 and spaced apart from the first electrode branch portion 210B to face the first electrode branch portion 210B. Similar to the first electrode rod portion 210S, the second electrode rod portion 220S may have one end connected to a pad (not shown). However, the other end of the second electrode rod portion 220S may extend to a plurality of pixels PX adjacent in the first direction D1. That is, the second electrode rod portion 220S may be electrically connected between the pixels PX. Therefore, among the pixels PX, the two ends of the second electrode rod portion 220S in one pixel may be connected to the corresponding ends of the second electrode rod portion 220S of the adjacent pixel. Therefore, the same electrical signal may be applied to the pixels PX.

[0143] The second electrode branch portion 220B may branch from at least a portion of the second electrode rod portion 220S and extend in the second direction D2 to terminate at a position spaced apart from the first electrode rod portion 210S. That is, the second electrode branch portion 220B disposed in each pixel PX may have one end connected to the second electrode rod portion 220S and the other end spaced apart from the first electrode rod portion 210S. Since the second electrode branch portion 220B is connected to the second electrode rod portion 220S electrically connected between the pixels PX, the same electrical signal may be applied to the pixels PX.

[0144] In addition, the second electrode branch portion 220B may be spaced apart from the first electrode branch portion 210B to face the first electrode branch portion 210B. Here, since the first electrode rod portion 210S and the second electrode rod portion 220S are spaced apart to face each other in opposite directions relative to the center of each pixel PX, the first electrode branch portion 210B and the second electrode branch portion 220B may extend in opposite directions. In other words, the first electrode branch portion 210B may extend in one direction of the second direction D2, and the second electrode branch portion 220B may extend in another direction of the second direction D2, so the corresponding ends of the branch portions may be arranged in opposite directions relative to the center of each pixel PX. However, the present disclosure is not limited to this case, and the first electrode rod portion 210S and the second electrode rod portion 220S may also be arranged in the same direction relative to the center of each pixel PX and spaced apart from each other. In this case, the first electrode branch portion 210B and the second electrode branch portion 220B branched from the electrode rod portions 210S and 220S, respectively, may extend in the same direction.

[0145] Despite Figure 6 One second electrode branch portion 220B is disposed in each pixel PX, but the present disclosure is not limited to this case. More second electrode branch portions 220B may also be disposed.

[0146] The light emitting elements 300 may be aligned between the first electrode branch portion 210B and the second electrode branch portion 220B. Specifically, at least some of the light emitting elements 300 may have a respective end electrically connected to the first electrode branch portion 210B and another respective end electrically connected to the second electrode branch portion 220B.

[0147] The light emitting elements 300 may be spaced apart from each other in the second direction D2 and may be aligned substantially parallel to each other. The gaps between the light emitting elements 300 are not particularly limited. In some cases, a plurality of light emitting elements 300 may be disposed adjacent to each other, while other light emitting elements 300 are spaced apart from each other by a predetermined gap. Alternatively, the light emitting elements 300 may be oriented and aligned in one direction with uneven density.

[0148] The contact electrodes 260 may be disposed on the first electrode branch portions 210B and the second electrode branch portions 220B, respectively.

[0149] The contact electrodes 260 may extend in the second direction D2 and be spaced apart from each other in the first direction D1. Each of the contact electrodes 260 may contact at least one end of each light emitting element 300, and may contact the first electrode 210 or the second electrode 220 to receive an electrical signal. Therefore, the contact electrode 260 may transmit the electrical signal received from the first electrode 210 and the second electrode 220 to the light emitting element 300.

[0150] The contact electrodes 260 may be respectively disposed on the electrode branch portions 210B and 220B to partially cover the electrode branch portions 210B and 220B. The contact electrodes 260 may include a first contact electrode 261 and a second contact electrode 262 contacting one end or the other end of each light emitting element 300 .

[0151] The first contact electrode 261 may be disposed on the first electrode branch portion 210B and may contact one end of each light emitting element 300 electrically connected to the first electrode 210. The second contact electrode 262 may be disposed on the second electrode branch portion 220B and may contact the other end of each light emitting element 300 electrically connected to the second electrode 220.

[0152] In some embodiments, both ends of each light emitting element 300 electrically connected to the first electrode branch portion 210B or the second electrode branch portion 220B may be a p-type or n-type doped conductive semiconductor layer. When the corresponding end of the light emitting element 300 electrically connected to the first electrode branch portion 210B is a p-type doped conductive semiconductor layer, the other corresponding end of the light emitting element 300 electrically connected to the second electrode branch portion 220B may be an n-type doped conductive semiconductor layer. However, the present disclosure is not limited to this case, and vice versa.

[0153] The first contact electrode 261 and the second contact electrode 262 may be disposed on the first electrode branch portion 210B and the second electrode branch portion 220B, respectively, to partially cover the first electrode branch portion 210B and the second electrode branch portion 220B. Figure 6As shown in , the first contact electrode 261 and the second contact electrode 262 may extend in the second direction D2 and may be spaced apart to face each other. Here, the respective ends of the first contact electrode 261 and the second contact electrode 262 may terminate at a position where the respective ends of the electrode branch portions 210B and 220B are partially exposed. In addition, the other respective ends of the first contact electrode 261 and the second contact electrode 262 may terminate at a position spaced apart from the electrode rod portions 210S and 220S so as not to overlap with the electrode rod portions 210S and 220S. However, the present disclosure is not limited to this case, and the first contact electrode 261 and the second contact electrode 262 may also completely cover the electrode branch portions 210B and 220B.

[0154] like Figure 6 As shown in FIG. 1 , the first electrode rod portion 210S and the second electrode rod portion 220S may be electrically connected to a thin film transistor 120 and a power wiring 161 (see FIG. 1 ) to be described later through contact holes (eg, a first electrode contact hole CNTD and a second electrode contact hole CNTS), respectively. Figure 7 ). Figure 6 The contact holes on the first electrode rod portion 210S and the second electrode rod portion 220S are provided in each pixel PX, but the present disclosure is not limited to this case. Since the second electrode rod portion 220S extends to and is electrically connected to the adjacent pixel PX as described above, in some embodiments, the second electrode rod portion 220S may be electrically connected to the thin film transistor 120 via one contact hole.

[0155] Now refer to Figure 7 A more specific structure of the components provided in the display panel 10 is described.

[0156] Figure 7 It is along Figure 6 The cross-sectional views taken along the lines I-I', II-II' and III-III' are shown. Figure 7 Only one pixel PX is shown in FIG. 1 , but it can also be applied to other pixels. Figure 7 A cross section across one end and the other end of the light emitting element 300 is shown.

[0157] Reference Figure 6 and Figure 7, the display panel 10 may include a substrate 110, thin film transistors 120 and 140 disposed on the substrate 110, and electrodes 210 and 220 disposed above the thin film transistors 120 and 140, and a light emitting element 300. The thin film transistors 120 and 140 may include a first thin film transistor 120 and a second thin film transistor 140, which may be a driving transistor and a switching transistor, respectively. Each of the thin film transistors 120 and 140 may include an active layer, a gate electrode, a source electrode, and a drain electrode. The first electrode 210 may be electrically connected to the drain electrode of the first thin film transistor 120.

[0158] 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. The polymer material may be, for example, polyethersulfone (PES), polyacrylate (PA), polyarylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyallyl ester, polyimide (PI), polycarbonate (PC), cellulose triacetate (CAT), cellulose acetate propionate (CAP) or a combination of these materials. The substrate 110 may be a rigid substrate, or may be a flexible substrate that can be bent, folded or curled.

[0159] The buffer layer 115 may be disposed on the substrate 110. The buffer layer 115 may prevent diffusion of impurity ions, prevent penetration of moisture or external air, and perform a surface planarization function. The buffer layer 115 may include silicon nitride, silicon oxide, or silicon oxynitride.

[0160] 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, or an oxide semiconductor.

[0161] 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 film of the thin film transistors 120 and 140. 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. These materials may be used alone or in combination with each other.

[0162] The first conductive layer is disposed on the first gate insulating layer 170. The first conductive layer may include: a first gate electrode 121 disposed on the first active layer 126 of the first thin film transistor 120, and the first gate insulating layer 170 is interposed between the first gate electrode 121 and the first active layer 126; a second gate electrode 141 disposed on the second active layer 146 of the second thin film transistor 140, and the first gate insulating layer 170 is interposed between the second gate electrode 141 and the second active layer 146; and a power wiring 161 disposed on the auxiliary layer 163, and the first gate insulating layer 170 is interposed between the power wiring 161 and the auxiliary layer 163. The first conductive layer may include one or more metals selected from 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 a single-layer film or a multi-layer film.

[0163] The second gate insulating layer 180 is disposed on the first conductive layer. The second gate insulating layer 180 may be an interlayer insulating film. 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.

[0164] The second conductive layer is disposed on the second gate insulating layer 180. The second conductive layer includes a capacitor electrode 128 disposed on the first gate electrode 121 with the second gate insulating layer 180 interposed therebetween. The capacitor electrode 128 may form a storage capacitor with the first gate electrode 121.

[0165] Similar to the first conductive layer, the second conductive layer may include one or more metals selected from 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).

[0166] The interlayer insulating layer 190 is disposed on the second conductive layer. The interlayer insulating layer 190 may be an interlayer insulating film. In addition, the interlayer insulating layer 190 may perform a surface planarization function. The interlayer insulating layer 190 may include an organic insulating material such as a polyacrylate resin, an epoxy resin, a phenolic resin, a polyamide resin, a polyimide resin, an unsaturated polyester resin, a polyphenylene ether resin, a polyphenylene sulfide resin, or a benzocyclobutene (BCB).

[0167] The third conductive layer is disposed on the interlayer insulating 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 electrode 162 disposed on the power wiring 161 .

[0168] The first source electrode 124 and the first drain electrode 123 may be electrically connected to the first active layer 126 via first contact holes 129 penetrating the interlayer insulating 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 via second contact holes 149 penetrating the interlayer insulating layer 190, the second gate insulating layer 180, and the first gate insulating layer 170, respectively. The power electrode 162 may be electrically connected to the power wiring 161 via a third contact hole 169 penetrating the interlayer insulating layer 190 and the second gate insulating layer 180.

[0169] The third conductive layer may include one or more metals selected from 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 a single layer or a multilayer film. For example, the third conductive layer may have a stacked structure of Ti / Al / Ti, Mo / Al / Mo, Mo / AlGe / Mo or Ti / Cu.

[0170] The insulating substrate layer 200 is disposed on the third conductive layer. The insulating substrate layer 200 may be made of an organic material, such as polyacrylate resin, epoxy resin, phenolic resin, polyamide resin, polyimide resin, unsaturated polyester resin, polyphenylene oxide resin, polyphenylene sulfide resin or benzocyclobutene (BCB). The surface of the insulating substrate layer 200 may be flat.

[0171] A plurality of banks 410 and 420 may be disposed on the insulating substrate layer 200. The banks 410 and 420 may be spaced apart in each pixel PX to face each other, and the first electrode 210 and the second electrode 220 may be disposed on the banks 410 and 420 (e.g., the first bank 410 and the second bank 420) spaced apart from each other, respectively. Figure 6 In the embodiment, three banks 410 and 420 (specifically, two first banks 410 and one second bank 420) are provided in one pixel PX, and the first electrode 210 and the second electrode 220 cover the first bank 410 and the second bank 420, respectively. Figure 7, a cross section of one of the first bank 410 and one of the second bank 420 is shown, and the arrangement structure of the first bank 410 and the second bank 420 can be applied to Figure 7 Another first bank 410 not shown in FIG.

[0172] However, the number of the levees 410 and 420 is not limited. For example, more levees 410 and 420 may be placed in one pixel PX, and therefore, more first electrodes 210 and more second electrodes 220 may be placed. The levees 410 and 420 may include one or more first levees 410 on which the first electrode 210 is disposed and one or more second levees 420 on which the second electrode 220 is disposed. In this case, the first levees 410 and the second levees 420 may be spaced apart to face each other, and may be alternately arranged in one direction. In some embodiments, two first levees 410 may be spaced apart from each other, and one second levee 420 may be disposed between the first levees 410 spaced apart from each other.

[0173] In addition, despite the Figure 7 Although not shown in the figure, each of the first electrode 210 and the second electrode 220 may include the electrode rod portion 210S or 220S and the electrode branch portion 210B or 220B as described above. It is understood that the first electrode branch portion 210B and the second electrode branch portion 220B are respectively arranged at Figure 7 On the first bank 410 and the second bank 420.

[0174] The banks 410 and 420 may be formed of substantially the same material in one process. In this case, the banks 410 and 420 may form a grid pattern. The banks 410 and 420 may include polyimide (PI).

[0175] Although not shown in the drawings, at least some of the dikes 410 and 420 may be provided at the boundary of each pixel PX to separate the pixels PX from each other. In this case, the electrodes 210 and 220 may not be provided on the dikes 410 and 420 provided at the boundary of the pixels PX. These dikes may also be arranged in a substantially grid pattern together with the first dike 410 and the second dike 420 described above. At least some of the dikes 410 and 420 provided at the boundary of each pixel PX may also cover other electrode lines of the display panel 10.

[0176] At least a portion of each of the embankments 410 and 420 may protrude from the insulating substrate layer 200. Each of the embankments 410 and 420 may protrude upward from a plane in which the light emitting element 300 is disposed, and at least a portion of the protruding portion may be inclined. The reflective layers 211 and 221 disposed on the protruding and inclined embankments 410 and 420 may reflect incident light. Light guided from the light emitting element 300 to the reflective layers 211 and 221 may be reflected to the outside of the display panel 10, for example, reflected above the embankments 410 and 420. The shape of the protruding embankments 410 and 420 is not particularly limited. Figure 7 In the embodiment, each of the banks 410 and 420 has an inclined side surface, a flat upper surface, and an angled corner. However, the present disclosure is not limited to this case, and each of the banks 410 and 420 may also protrude in a curved shape.

[0177] Reflective layers 211 and 221 may be disposed on the banks 410 and 420 .

[0178] The first reflective layer 211 covers the first bank 410 and has a portion electrically connected to the first drain electrode 123 of the first thin film transistor 120 via a fourth contact hole 319_1 penetrating the insulating substrate layer 200. The second reflective layer 221 covers the second bank 420 and has a portion electrically connected to the power electrode 162 via a fifth contact hole 319_2 penetrating the insulating substrate layer 200.

[0179] The first reflective layer 211 may be electrically connected to the first drain electrode 123 of the first thin film transistor 120 via the fourth contact hole 319_1 in each pixel PX. Therefore, the first thin film transistor 120 may be disposed in a region overlapping with each pixel PX. Figure 6 In the embodiment, the first reflective layer 211 is electrically connected to the first thin film transistor 120 via the first electrode contact hole CNTD disposed on the first electrode rod portion 210S. That is, the first electrode contact hole CNTD may be the fourth contact hole 319_1.

[0180] The second reflective layer 221 may be electrically connected to the power electrode 162 via the fifth contact hole 319_2 in each pixel PX. Figure 7 In the embodiment, the second reflective layer 221 is connected to the power electrode 162 via the fifth contact hole 319_2 in one pixel PX. Figure 6 In the embodiment, the second electrodes 220 of the pixels PX are electrically connected to the power wiring 161 via the plurality of second electrode contact holes CNTS on the second electrode rod portions 220S, respectively. That is, each of the second electrode contact holes CNTS may be a fifth contact hole 319_2.

[0181] As mentioned above, in Figure 6In the embodiment, the first electrode contact hole CNTD and the second electrode contact hole CNTS are respectively disposed on the first electrode rod portion 210S and the second electrode rod portion 220S. Figure 7 In the cross-section of the display panel 10, the first electrode 210 and the second electrode 220 are electrically connected to the first thin film transistor 120 and the power wiring 161 via the fourth contact hole 319_1 and the fifth contact hole 319_2, respectively, in the area separated from the embankments 410 and 420 on which the first electrode branch portion 210B and the second electrode branch portion 220B are arranged.

[0182] However, the present disclosure is not limited to this case. Figure 6 In the embodiment, the second electrode contact hole CNTS may also be disposed at different positions on the second electrode rod portion 220S, and in some cases, may be located on the second electrode branch portion 220B. In addition, in some embodiments, in a region other than one pixel PX, the second reflective layer 221 may be connected to one second electrode contact hole CNTS or one fifth contact hole 319_2.

[0183] The display panel 10 may have an area other than the display area DA where the pixels PX are disposed, for example, a non-display area NDA. The second electrodes 220 of the pixels PX may be electrically connected to each other through the second electrode rod portion 220S to receive the same electrical signal.

[0184] In some embodiments, in the case of the second electrode 220, the second electrode rod portion 220S may be electrically connected to the power electrode 162 via a contact hole in the non-display area NDA located on the periphery of the display panel 10. Figure 6 Unlike the display panel 10 of the present invention, the second electrode rod portion 220S is connected to the power electrode 162 via one contact hole, and since the second electrode rod portion 220S extends to the adjacent pixel PX and is electrically connected to the adjacent pixel PX, the same electrical signal can be applied to the second electrode branch portion 220B of each pixel PX. The position of the contact hole through which the second electrode 220 of the display panel 10 receives the electrical signal from the power electrode 162 may vary according to the structure of the display panel 10.

[0185] Refer again Figure 6 and Figure 7 , the reflective layers 211 and 221 may include a material having a high reflectivity so as to reflect light emitted from the light emitting element 300. For example, the reflective layers 211 and 221 may include a material such as, but not limited to, silver (Ag) or copper (Cu).

[0186] The first electrode layer 212 and the second electrode layer 222 may be disposed on the first reflective layer 211 and the second reflective layer 221 , respectively.

[0187] The first electrode layer 212 is directly disposed on the first reflective layer 211. The first electrode layer 212 may have substantially the same pattern as the first reflective layer 211. The second electrode layer 222 is directly disposed on the second reflective layer 221 and is spaced apart from the first electrode layer 212. The second electrode layer 222 may have substantially the same pattern as the second reflective layer 221.

[0188] In an embodiment, the electrode layers 212 and 222 may respectively cover the reflective layers 211 and 221. That is, the electrode layers 212 and 222 may be formed larger than the reflective layers 211 and 221 to cover the side surfaces of the respective ends of the reflective layers 211 and 221. However, the present disclosure is not limited to this case.

[0189] The first electrode layer 212 and the second electrode layer 222 can transmit electrical signals to the contact electrodes 261 and 262 described later, respectively, and these electrical signals are transmitted to the first reflective layer 211 and the second reflective layer 221. The electrode layers 212 and 222 may include a transparent conductive material. For example, the electrode layers 212 and 222 may include materials such as, but not limited to, indium tin oxide (ITO), indium zinc oxide (IZO), or indium tin zinc oxide (ITZO). In some embodiments, the reflective layers 211 and 221 and the electrode layers 212 and 222 may form a structure in which one or more transparent conductive layers (such as, ITO, IZO or ITZO) and one or more metal layers (such as, silver or copper) are stacked. For example, the reflective layers 211 and 221 and the electrode layers 212 and 222 may form a stacked structure of ITO / silver (Ag) / ITO.

[0190] The first reflective layer 211 and the first electrode layer 212 disposed on the first bank 410 constitute the first electrode 210. The first electrode 210 may protrude from both ends of the first bank 410. Therefore, the protruding region of the first electrode 210 may contact the insulating substrate layer 200. In addition, the second reflective layer 221 and the second electrode layer 222 disposed on the second bank 420 constitute the second electrode 220. The second electrode 220 may protrude from both ends of the second bank 420. Therefore, the protruding region of the second electrode 220 may contact the insulating substrate layer 200.

[0191] The first electrode 210 and the second electrode 220 may completely cover the first bank 410 and the second bank 420, respectively. As described above, the first electrode 210 and the second electrode 220 are spaced apart to face each other. As will be described later, the first insulating layer 510 may be disposed in the space between the plurality of electrodes 210 and 220, and the light emitting element 300 may be disposed on the first insulating layer 510.

[0192] In addition, the first reflective layer 211 may receive a driving voltage from the first thin film transistor 120, and the second reflective layer 221 may receive a power supply voltage from the power wiring 161. Therefore, the first electrode 210 and the second electrode 220 may receive a driving voltage and a power supply voltage, respectively. The first electrode 210 may be electrically connected to the first thin film transistor 120, and the second electrode 220 may be electrically connected to the power wiring 161. Therefore, the first contact electrode 261 and the second contact electrode 262 provided on the first electrode 210 and the second electrode 220 may receive a driving voltage and a power supply voltage. The driving voltage and the power supply voltage may be transmitted to the light emitting element 300, and a predetermined current may flow through the light emitting element 300, so that the light emitting element 300 emits light.

[0193] The first insulating layer 510 is disposed on the first electrode 210 and the second electrode 220 to partially cover the first electrode 210 and the second electrode 220. The first insulating layer 510 may cover most of the upper surface of each of the first electrode 210 and the second electrode 220, and expose a portion of each of the first electrode 210 and the second electrode 220. In addition, the first insulating layer 510 may be disposed in a space between the first electrode 210 and the second electrode 220. In a plan view, the first insulating layer 510 may have an island shape or a linear shape formed along the space between the first electrode branch portion 210B and the second electrode branch portion 220B.

[0194] exist Figure 7 , the first insulating layer 510 is disposed between one first electrode 210 (e.g., the first electrode branch portion 210B) and one second electrode 220 (e.g., the second electrode branch portion 220B). Since the first electrode 210 and the second electrode 220 may be provided in plurality as described above, the first insulating layer 510 may also be disposed between one first electrode 210 and another second electrode 220, or between one second electrode 220 and another first electrode 210. In addition, the first insulating layer 510 may partially cover the side portions opposite to the corresponding facing side portions of the first electrode 210 and the second electrode 220. That is, the first insulating layer 510 may expose the central portion of each of the first electrode 210 and the second electrode 220.

[0195] The light emitting element 300 is disposed on the first insulating layer 510. The first insulating layer 510 may be disposed between the light emitting element 300 and the insulating substrate layer 200. The lower surface of the first insulating layer 510 may contact the insulating substrate layer 200, and the light emitting element 300 may be disposed on the upper surface of the first insulating layer 510. In addition, the first insulating layer 510 may contact the electrodes 210 and 220 on both sides to electrically insulate the electrodes 210 and 220 from each other.

[0196] The first insulating layer 510 may overlap some regions of the electrodes 210 and 220, for example, may partially overlap respective regions of the first electrode 210 and the second electrode 220 that protrude in the direction facing each other. In addition, the first insulating layer 510 may be provided in regions of the inclined side surfaces and the flat upper surfaces of the embankments 410 and 420 that overlap the electrodes 210 and 220.

[0197] For example, the first insulating layer 510 may cover the respective ends of the first electrode 210 and the second electrode 220 that protrude in the direction facing each other. A portion of the lower surface of the first insulating layer 510 may contact the insulating substrate layer 200, and a portion of the lower surface and the side surface of the first insulating layer 510 may contact each of the electrodes 210 and 220. Therefore, the first insulating layer 510 may protect the regions overlapping with the electrodes 210 and 220 and electrically insulate these regions from each other. In addition, the first insulating layer 510 prevents the first conductive type semiconductor 310 (see Figure 8 ) and a second conductive type semiconductor 320 (see Figure 8 ) directly contacts other components, thereby preventing the light emitting element 300 from being damaged.

[0198] However, the present disclosure is not limited to this case. In some embodiments, the first insulating layer 510 may be disposed only on the region of the first electrode 210 and the second electrode 220 that overlaps the inclined side surfaces of the dykes 410 and 420. In this case, the lower surface of the first insulating layer 510 may end on the inclined side surfaces of the dykes 410 and 420, and the electrodes 210 and 220 disposed on the portions of the inclined side surfaces of the dykes 410 and 420 may be exposed to contact the contact electrode 260.

[0199] In addition, the first insulating layer 510 may expose both ends of the light emitting element 300. Therefore, the contact electrode 260 may contact the exposed upper surface of each of the electrodes 210 and 220 and both ends of the light emitting element 300, and may transmit an electrical signal applied to the first and second electrodes 210 and 220 to the light emitting element 300.

[0200] One or more light emitting elements 300 may be disposed between the first electrode 210 and the second electrode 220. Figure 7 In FIG. 1 , a light emitting element 300 is disposed between a first electrode 210 and a second electrode 220 in a cross section. Figure 6 As shown in , it is apparent that a plurality of light emitting elements 300 are arranged in another direction (eg, the second direction D2) in a plan view.

[0201] Specifically, the light emitting element 300 may have one end electrically connected to the first electrode 210 and the other end electrically connected to the second electrode 220. Both ends of the light emitting element 300 may contact the first contact electrode 261 and the second contact electrode 262, respectively.

[0202] Despite Figure 6 In each pixel PX, only the light emitting element 300 emitting light of the same color is provided, but the present disclosure is not limited to this case. As described above, the light emitting elements 300 emitting light of different colors may also be provided in one pixel PX at the same time.

[0203] The light emitting element 300 may be a light emitting diode (LED). The light emitting element 300 may be a nanostructure, the size of which is approximately nanometers. The light emitting element 300 may be an inorganic LED made of an inorganic material. When the light emitting element 300 is an inorganic LED, if a light emitting material having an inorganic crystal structure is placed between two opposing electrodes and an electric field is formed in the light emitting material in a specific direction, the inorganic LED may be aligned between two electrodes having a specific polarity.

[0204] In some embodiments, reference Figure 8 , the light emitting element 300 may include a first conductive type semiconductor 310, an element active layer 330, a second conductive type semiconductor 320, and an electrode material layer 370 formed sequentially, and an insulating material layer 380 covering the outer peripheral surface of the above layers. In the light emitting element 300, the first conductive type semiconductor 310, the element active layer 330, the second conductive type semiconductor 320, and the electrode material layer 370 may be stacked in this order in a direction parallel to the insulating substrate layer 200. In other words, the light emitting element 300 having the above layers may be arranged in a horizontal direction parallel to the insulating substrate layer 200. However, the present disclosure is not limited to this case, and the light emitting element 300 may also be aligned between the first electrode 210 and the second electrode 220 so that the above stacking direction is reversed.

[0205] In addition, despite the Figure 7 Only one light emitting element 300 is shown in the figure, but as described above, a plurality of light emitting elements 300 having different diameters may be provided between the first electrode 210 and the second electrode 220. The light emitting element 300 will be described in detail later.

[0206] The second insulating layer 520 may be disposed on the light emitting element 300 to overlap at least a portion of the light emitting element 300. The second insulating layer 520 may protect the light emitting element 300 while fixing the light emitting element 300 between the first electrode 210 and the second electrode 220.

[0207] Despite Figure 7In the cross-sectional view of FIG. 5 , the second insulating layer 520 is disposed only on the upper surface of the light emitting element 300, but it may also cover the outer surface of the light emitting element 300. That is, similar to the first insulating layer 510, the second insulating layer 520 may extend in the second direction D2 in an island shape or a linear shape along the space between the first electrode branch portion 210B and the second electrode branch portion 220B.

[0208] In addition, a portion of the material of the second insulating layer 520 may also be provided in a region where the lower surface of the light emitting element 300 contacts the first insulating layer 510. This portion may be formed during the manufacture of the display panel 10 when the light emitting element 300 is aligned on the first insulating layer 510 and the second insulating layer 520 is placed on the light emitting element 300. If a gap is formed in the first insulating layer 510 contacting the lower surface of the light emitting element 300, a portion of the material of the second insulating layer 520 may penetrate into the gap during the formation of the second insulating layer 520.

[0209] The second insulating layer 520 exposes both side surfaces of the light emitting element 300. That is, the length of the second insulating layer 520 provided on the upper surface of the light emitting element 300 in the cross section measured in one axial direction may be shorter than that of the light emitting element 300. Therefore, the second insulating layer 520 may be more recessed inward than both side surfaces of the light emitting element 300. Therefore, the side surfaces of the first insulating layer 510, the side surfaces of the light emitting element 300, and the side surfaces of the second insulating layer 520 may be stacked in a stair-like pattern. In this case, the contact electrodes 261 and 262 to be described later may smoothly contact the side surfaces of both ends of the light emitting element 300. However, the present disclosure is not limited to this case, and the length of the second insulating layer 520 and the length of the light emitting element 300 may also be equal so that both sides of the second insulating layer 520 are aligned with both sides of the light emitting element 300.

[0210] The second insulating layer 520 may be formed to cover the first insulating layer 510, and then the second insulating layer 520 may be patterned in a region (e.g., in a region where the light emitting element 300 is exposed to contact the contact electrode 260). The patterning of the second insulating layer 520 may be performed by conventional dry etching or wet etching. Here, the first insulating layer 510 and the second insulating layer 520 may include materials having different etching selectivities so as to prevent the first insulating layer 510 from being patterned. In other words, when the second insulating layer 520 is patterned, the first insulating layer 510 may be used as an etching stopper.

[0211] Therefore, even if the second insulating layer 520 is patterned to cover the outer surface of the light emitting element 300 and expose both ends of the light emitting element 300, the material of the first insulating layer 510 is not damaged. Specifically, the first insulating layer 510 and the light emitting element 300 can form a smooth contact surface at both ends of the light emitting element 300 (where the light emitting element 300 and the contact electrode 260 contact each other).

[0212] A first contact electrode 261 disposed on the first electrode 210 and overlapping at least a portion of the second insulating layer 520 , and a second contact electrode 262 disposed on the second electrode 220 and overlapping at least a portion of the second insulating layer 520 may be disposed on the second insulating layer 520 .

[0213] The first contact electrode 261 and the second contact electrode 262 may be disposed on the upper surfaces of the first electrode 210 and the second electrode 220, respectively. Specifically, in the region where the first insulating layer 510 is patterned to partially expose the first electrode 210 and the second electrode 220, the first contact electrode 261 and the second contact electrode 262 may contact the first electrode layer 212 and the second electrode layer 222, respectively. Each of the first contact electrode 261 and the second contact electrode 262 may contact the light emitting element 300 (e.g., the first conductive type semiconductor 310, the second conductive type semiconductor 320, or the electrode material layer 370 (see Figure 8 Thus, the first contact electrode 261 and the second contact electrode 262 may transmit an electrical signal applied to the first electrode layer 212 and the second electrode layer 222 to the light emitting element 300 .

[0214] The first contact electrode 261 may be disposed on the first electrode 210 to partially cover the first electrode 210, and a lower surface of the first contact electrode 261 may partially contact the light emitting element 300, the first insulating layer 510, and the second insulating layer 520. One end of the first contact electrode 261 adjacent to the second contact electrode 262 is disposed on the second insulating layer 520. The second contact electrode 262 may be disposed on the second electrode 220 to partially cover the second electrode 220, and a lower surface of the second contact electrode 262 may partially contact the light emitting element 300, the first insulating layer 510, and the third insulating layer 530. One end of the second contact electrode 262 adjacent to the first contact electrode 261 is disposed on the third insulating layer 530.

[0215] Regions of the first insulating layer 510 and the second insulating layer 520 covering the first electrode 210 and the second electrode 220 disposed on upper surfaces of the first bank 410 and the second bank 420 may be patterned. Thus, the first electrode layer 212 and the second electrode layer 222 of the first electrode 210 and the second electrode 220 may be exposed and electrically connected to the contact electrodes 261 and 262, respectively, in the exposed regions.

[0216] The first contact electrode 261 and the second contact electrode 262 may be spaced apart from each other on the second insulating layer 520 or the third insulating layer 530. That is, both the first contact electrode 261 and the second contact electrode 262 may contact the light emitting element 300 and the second insulating layer 520 or the third insulating layer 530, but may also be spaced apart from each other on the second insulating layer 520 in the stacking direction, and thus be electrically insulated from each other. Therefore, the first contact electrode 261 and the second contact electrode 262 may receive different power from the first thin film transistor 120 and the power wiring 161. For example, the first contact electrode 261 may receive a driving voltage applied from the first thin film transistor 120 to the first electrode 210, and the second contact electrode 262 may receive a common power supply voltage applied from the power wiring 161 to the second electrode 220. However, the present disclosure is not limited to this case.

[0217] The contact electrodes 261 and 262 may include a conductive material such as, but not limited to, ITO, IZO, ITZO, or aluminum (Al).

[0218] In addition, the contact electrodes 261 and 262 may include the same material as the electrode layers 212 and 222. The contact electrodes 261 and 262 may be disposed on the electrode layers 212 and 222 in substantially the same pattern as the electrode layers 212 and 222 so as to contact the electrode layers 212 and 222. For example, the first contact electrodes 261 and the second contact electrodes 262 contacting the first electrode layers 212 and the second electrode layers 222 may receive an electrical signal applied to the first electrode layers 212 and the second electrode layers 222, and transmit the received electrical signal to the light emitting element 300.

[0219] The third insulating layer 530 may be disposed on the first contact electrode 261 to electrically insulate the first contact electrode 261 and the second contact electrode 262 from each other. The third insulating layer 530 may cover the first contact electrode 261 and may not overlap with a portion of the light emitting element 300, so that the light emitting element 300 may contact the second contact electrode 262. On the upper surface of the second insulating layer 520, the third insulating layer 530 may partially contact the first contact electrode 261, the second contact electrode 262, and the second insulating layer 520. The third insulating layer 530 may cover one end of the first contact electrode 261 located on the upper surface of the second insulating layer 520. Therefore, the third insulating layer 530 may protect the first contact electrode 261 while electrically insulating the first contact electrode 261 from the second contact electrode 262.

[0220] One end of the third insulating layer 530 in a direction in which the second electrode 220 is provided may be aligned with a side surface of the second insulating layer 520 .

[0221] In some embodiments, the third insulating layer 530 may be omitted from the display panel 10. Thus, the first contact electrode 261 and the second contact electrode 262 may be disposed in substantially the same plane and may be electrically insulated from each other by a passivation layer 550 to be described below.

[0222] The passivation layer 550 may be formed on the third insulating layer 530 and the second contact electrode 262 to protect the components disposed on the insulating substrate layer 200 from the external environment. If the first contact electrode 261 and the second contact electrode 262 are exposed, the contact electrode material may be broken due to electrode damage. Therefore, the first contact electrode 261 and the second contact electrode 262 may be covered by the passivation layer 550. That is, the passivation layer 550 may cover the first electrode 210, the second electrode 220, the light emitting element 300, etc. In addition, if the third insulating layer 530 is omitted as described above, the passivation layer 550 may be formed on the first contact electrode 261 and the second contact electrode 262. In this case, the passivation layer 550 may electrically insulate the first contact electrode 261 and the second contact electrode 262 from each other.

[0223] Each of the first insulating layer 510, the second insulating layer 520, the third insulating layer 530, and the passivation layer 550 described above may include an inorganic insulating material. For example, the first insulating layer 510, the second insulating layer 520, the third insulating layer 530, and the passivation layer 550 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) or aluminum nitride (AlN). The first insulating layer 510, the second insulating layer 520, the third insulating layer 530 and the passivation layer 550 may be made of the same material or different materials. In addition, various materials that allow the first insulating layer 510, the second insulating layer 520, the third insulating layer 530 and the passivation layer 550 to have insulating properties may be applied.

[0224] The first insulating layer 510 and the second insulating layer 520 may have different etching selectivities as described above. In an example, when the first insulating layer 510 includes silicon oxide (SiO x ), the second insulating layer 520 may include silicon nitride (SiN x In another example, when the first insulating layer 510 includes silicon nitride (SiN x ), the second insulating layer 520 may include silicon oxide (SiO x ). However, the present disclosure is not limited to this case.

[0225] The light emitting element 300 may be manufactured on a substrate by an epitaxial growth method. A seed layer for forming a semiconductor layer may be formed on the substrate, and a desired semiconductor material may be deposited and grown. Figure 8 The structure of the light emitting element 300 according to various embodiments is described in detail.

[0226] Figure 8 is a schematic diagram of a light emitting element according to an embodiment.

[0227] Reference Figure 8 , the light emitting element 300 may include a plurality of conductive type semiconductors 310 and 320, an element active layer 330, an electrode material layer 370, and an insulating material layer 380. An electrical signal applied from the first electrode 210 and the second electrode 220 may be transmitted to the element active layer 330 through the conductive type semiconductors 310 and 320. As a result, light may be emitted.

[0228] Specifically, the light emitting element 300 may include a first conductive type semiconductor 310, a second conductive type semiconductor 320, an element active layer 330 disposed between the first conductive type semiconductor 310 and the second conductive type semiconductor 320, an electrode material layer 370 disposed on the second conductive type semiconductor 320, and an insulating material layer 380 covering the peripheral surfaces of the above layers. The insulating material layer 380 may contact the first conductive type semiconductor 310, the second conductive type semiconductor 320, the element active layer 330, and the electrode material layer 370, and cover the peripheral surfaces of the above layers. Figure 8The light emitting element 300 has a structure in which a first conductive type semiconductor 310, an element active layer 330, a second conductive type semiconductor 320, and an electrode material layer 370 are sequentially formed in the longitudinal direction, but the present disclosure is not limited to this case. The electrode material layer 370 may also be omitted, and in some embodiments, the electrode material layer 370 may be disposed on at least any one of the two side surfaces of each of the first conductive type semiconductor 310 and the second conductive type semiconductor 320. Figure 8 The light emitting element 300 is taken as an example, and it is apparent that even if the light emitting element 300 also includes another structure, the following description of the light emitting element 300 is applicable.

[0229] The first conductive type semiconductor 310 may be an n-type semiconductor layer. In an example, if the light emitting element 300 emits light having a blue wavelength band, the first conductive type semiconductor 310 may be an n-type semiconductor layer having an In x Al y Ga 1-x-y N (0≤x≤1, 0≤y≤1, 0≤x+y≤1) semiconductor material. For example, the first conductive type semiconductor 310 can be any one or more of n-type doped InAlGaN, GaN, AlGaN, InGaN, AlN and InN. The first conductive type semiconductor 310 can be doped with a first conductive dopant. The first conductive dopant can be, for example, Si, Ge or Sn. The length of the first conductive type semiconductor 310 can be in the range of about 1.5μm to about 5μm, but is not limited thereto.

[0230] The second conductive type semiconductor 320 may be a p-type semiconductor layer. In an example, if the light emitting element 300 emits light having a blue wavelength band, the second conductive type semiconductor 320 may be a p-type semiconductor layer. x Al y Ga 1-x-y N (0≤x≤1, 0≤y≤1, 0≤x+y≤1) semiconductor material. For example, the second conductive type semiconductor 320 can be any one or more of p-type doped InAlGaN, GaN, AlGaN, InGaN, AlN and InN. The second conductive type semiconductor 320 can be doped with a second conductive dopant. The second conductive dopant can be, for example, Mg, Zn, Ca, Se or Ba. The length of the second conductive type semiconductor 320 can be in the range of about 0.08 μm to about 0.25 μm, but is not limited thereto.

[0231] The element active layer 330 may be disposed between the first conductive type semiconductor 310 and the second conductive type semiconductor 320, and may include a material having a single quantum well structure or a multi-quantum well structure. When the element active layer 330 includes a material having a multi-quantum well structure, it may have a structure in which a plurality of quantum layers and a plurality of well layers are alternately stacked. According to an electrical signal received through the first conductive type semiconductor 310 and the second conductive type semiconductor 320, the element active layer 330 may emit light by the combination of electron-hole pairs. For example, if the element active layer 330 emits light having a blue wavelength band, it may include a material such as AlGaN or AlInGaN. Specifically, if the element active layer 330 has a multi-quantum well structure in which quantum layers and well layers are alternately stacked, the quantum layers may include materials such as AlGaN or AlInGaN, and the well layers may include materials such as GaN or AlGaN. However, the present disclosure is not limited to this case, and the element active layer 330 may also 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, or may include different group 3 or group 5 semiconductor materials according to the wavelength band of the emitted light. Therefore, the light emitted from the element active layer 330 is not limited to light having a blue wavelength band, but may also be light having a red or green wavelength band in some cases. The length of the element active layer 330 may be in the range of about 0.05 μm to about 0.25 μm, but is not limited thereto.

[0232] The light emitted from the element active layer 330 may be emitted not only to the outer surface of the light emitting element 300 in the longitudinal direction but also to both side surfaces. That is, the direction of the light emitted from the element active layer 330 is not limited to one direction.

[0233] The wavelength band of light emitted from the element active layer 330 of the light emitting element 300 may vary according to the composition of the element active layer 330. Specifically, the element active layer 330 may emit light of different colors according to the type of active material. However, even if the element active layer 330 includes the same kind of active material, its emission wavelength may vary according to the composition ratio in the element active layer 330 and the lattice strain of the semiconductor crystal. In other words, by including the same kind of active material, the element active layer 330 may have a specific band gap energy, but the band gap energy may vary according to the lattice strain of the active material crystal formed in the element active layer 330 during the manufacture of the light emitting element 300. Therefore, the wavelength band of the emitted light may vary.

[0234] Here, if a plurality of light emitting elements 300 are formed to have different diameters, the lattice strain of the active material crystals contained in the element active layer 330 of each light emitting element 300 may be different. The different lattice strains of the light emitting elements 300 may cause the element active layer 330 to have different band gap energies, thereby causing the emitted light to have different wavelength bands.

[0235] Therefore, based on a light-emitting element 300 that emits light having a specific wavelength band, the emission wavelength of another light-emitting element 300 can be controlled by adjusting the diameter of another light-emitting element 300, wherein the wavelength band of light emitted by the other light-emitting element 300 is different from the wavelength band of light emitted from the above light-emitting element 300.

[0236] The electrode material layer 370 may be an ohmic contact electrode. However, the electrode material layer 370 is not limited to the ohmic contact electrode, and may also be a Schottky contact electrode. The electrode material layer 370 may include a conductive metal. For example, the electrode material layer 370 may include at least any one of aluminum (Al), titanium (Ti), indium (In), gold (Au), silver (Ag), indium tin oxide (ITO), indium zinc oxide (IZO), and indium tin zinc oxide (ITZO). The electrode material layer 370 may include the same material or different materials, but the present disclosure is not limited to this case.

[0237] The insulating material layer 380 may be formed outside the first conductive type semiconductor 310, the second conductive type semiconductor 320, the element active layer 330, and the electrode material layer 370, and protect these layers. For example, the insulating material layer 380 may surround the side surfaces of the above layers, and may not be formed at both ends of the light emitting element 300 in the longitudinal direction, for example, not formed at both ends where the first conductive type semiconductor 310 and the electrode material layer 370 are provided. However, the present disclosure is not limited to this case.

[0238] The insulating material layer 380 may include an insulating material such as silicon oxide (SiO x ), silicon nitride (SiN x ), silicon oxynitride (SiO x N y ), aluminum nitride (AlN) or aluminum oxide (Al 2 O 3 ). Therefore, it is possible to prevent an electrical short circuit that may occur when the element active layer 330 directly contacts the first electrode 210 or the second electrode 220. In addition, since the insulating material layer 380 protects the outer peripheral surface of the light emitting element 300 including the element active layer 330, it is possible to prevent a decrease in light emitting efficiency.

[0239] Although the insulating material layer 380 extends in the longitudinal direction to cover from the first conductive type semiconductor 310 to the electrode material layer 370, the present disclosure is not limited to this case. The insulating material layer 380 may also cover only the first conductive type semiconductor 310, the element active layer 330, and the second conductive type semiconductor 320, or may cover only a portion of the outer surface of the electrode material layer 370 to expose a portion of the outer surface of the electrode material layer 370.

[0240] The thickness of the insulating material layer 380 may be in the range of about 0.5 μm to about 1.5 μm, but is not limited thereto.

[0241] In addition, in some embodiments, the outer peripheral surface of the insulating material layer 380 may be processed. As described above, in order to align the light emitting element 300 between the electrodes 210 and 220, a solution in which a plurality of light emitting elements 300 are dispersed may be applied. Here, the surface of the insulating material layer 380 may be hydrophobically or hydrophilically treated so that the light emitting element 300 remains separated in the solution without being aggregated with other adjacent light emitting elements 300. Therefore, the light emitting element 300 may be aligned between the first electrode 210 and the second electrode 220 without being aggregated.

[0242] The light emitting element 300 may be cylindrical. Therefore, a cross section of the light emitting element 300 taken across both ends of the light emitting element 300 in the longitudinal direction may have a quadrilateral shape. However, the light emitting element 300 is not limited to a cylindrical shape, and the light emitting element 300 may also have different shapes, such as a cube, a cuboid, and a hexagonal prism. The light emitting element 300 may have a length l of about 1 μm to about 10 μm or about 2 μm to about 5 μm, preferably, a length l of about 4 μm. In addition, the light emitting element 300 may have a diameter of 300 nm to 700 nm. As described above, the light emitting elements 300 included in the display panel 10 may have different diameters according to the composition of their corresponding element active layers 330. The diameter of the light emitting element 300 may be about 500 nm.

[0243] Now refer to Figures 9 to 13 A method of manufacturing the light emitting element 300 according to an embodiment is described. Some repeated reference numerals are not repeated. Figures 9 to 13 , and reference can be made to the previous drawings.

[0244] Figures 9 to 13 is a schematic diagram illustrating a method of manufacturing a display panel according to an embodiment.

[0245] First, refer to Fig. 9, the ground wiring 600, the first alignment wiring 710, the second alignment wiring 720 and the third alignment wiring 730 are placed on the lower substrate SUB of the display panel 10. The arrangement structure of the ground wiring 600 and the alignment wirings 710 to 730 is as described above with reference to Figure 5 In Fig. 9 A display area DA, a non-display area NDA, a first alignment area AA1, a second alignment area AA2, and a third alignment area AA3 may also be defined in the lower substrate SUB of the display panel 10.

[0246] and Figure 5 Different in Fig. 9 Each ground wiring branch portion 600B may be formed as a single piece. The alignment wiring branch portion 700B may be formed by cutting each ground wiring branch portion 600B after aligning the light emitting element 300 between each ground wiring branch portion 600B and each alignment wiring branch portion 700B. Figure 5 The ground wiring branch portion 600B.

[0247] Next, refer to Figures 10 to 12 , a coating solution S containing the light emitting element 300 is coated on the alignment area AA, and an alignment signal is applied through each alignment wiring 700 .

[0248] The coating solution S containing the light emitting element 300 may be coated on the lower substrate SUB of the display panel 10 through a nozzle. In an example, the process of coating the light emitting element 300 may be performed by inkjet printing or dye solvent coating. In an exemplary embodiment, inkjet printing may be used.

[0249] The light emitting element 300 may be coated on the display area DA defined in the lower substrate SUB of the display panel 10 by using a nozzle. There is no particular limitation on the order of coating the light emitting element 300. For example, the light emitting element 300 may be sequentially coated from the first side of the first alignment area AA1 to the second side of the third alignment area AA3 in the second direction D2.

[0250] Although the nozzle moves only in the second direction D2 in the drawings, the present disclosure is not limited to this case. In some cases, the nozzle may apply the coating solution S while also moving in the alignment area AA in the first direction D1 or other directions. For example, when the amount of the coating solution S ejected from the nozzle is insufficient to cover each alignment area AA, the nozzle may repeat the operation of moving in another direction (e.g., in the first direction D1 or another direction) and then move again in the second direction D2. That is, the moving direction of the nozzle is not particularly limited as long as the coating solution S can be applied to the first alignment area AA1, the second alignment area AA2, and the third alignment area AA3 of the display panel 10.

[0251] First, when aligning the light emitting element 300 , the coating solution S is not applied at the initial time (T=t0). In addition, the alignment signal may not be transmitted to each alignment wiring 710 , 720 , or 730 .

[0252] The coating solution S containing the light emitting element 300 may be coated on at least a portion of the first alignment area AA1 at a first time (T=t1), the coating solution S containing the light emitting element 300 may be coated on at least a portion of the second alignment area AA2 at a second time (T=t2), and the coating solution S containing the light emitting element 300 may be coated on at least a portion of the third alignment area AA3 at a third time (T=t3). That is, the nozzle for applying the coating solution S may be sequentially moved from the first alignment area AA1 to the second alignment area AA2 and the third alignment area AA3.

[0253] According to an embodiment, during the manufacture of the display panel 10, at times t1, t2, and t3 when the light emitting element 300 is applied on the alignment area AA, an alignment signal may be applied only to the alignment wiring branch portion 700B disposed in the alignment area AA on which the light emitting element 300 is applied. In other words, the times t1, t2, and t3 when the light emitting element 300 is applied on the alignment area AA may be the same as the time when the alignment signal is applied to the alignment wiring 700 disposed in the alignment area AA.

[0254] First, the ground wiring 600 may be maintained grounded during the first time t1, the second time t2, and the third time t3 of applying the coating solution S. Therefore, an electric field induced capacitance may be formed in the corresponding alignment area AA according to an alignment signal applied to the alignment wiring branch portion 700B facing the ground wiring branch portion 600B at each time t1, t2, or t3.

[0255] In the case of the alignment wiring 700 , when the coating solution S is coated on the alignment area AA, the alignment signal may be applied only to the alignment wiring 710 , 720 , or 730 , the alignment wiring branch portion 700B of which is disposed in the alignment area AA.

[0256] For example, at the first time t1 when the light emitting element 300 is coated on the first alignment area AA1, an alignment signal is applied from the first signal applying pad AP1 to the first alignment wiring 710 through a probe connected to an external power source. On the other hand, at the first time t1, an alignment signal may not be applied to the second alignment wiring 720 and the third alignment wiring 730. Therefore, at the first time t1, an electric field induced capacitance C1 may be formed only in the first alignment area AA1, and capacitance may not be formed in the second alignment area AA2 and the third alignment area AA3.

[0257] Next, at the second time t2 when the light emitting element 300 is coated on the second alignment area AA2, an alignment signal may be applied from the second signal applying pad AP2 to the second alignment wiring 720, but an alignment signal may not be applied to the first alignment wiring 710 and the third alignment wiring 730. Therefore, at the second time t2, a capacitor C2 may be formed only in the second alignment area AA2, and a capacitor may not be formed in the first alignment area AA1 and the third alignment area AA3.

[0258] Next, at the third time t3 when the light emitting element 300 is coated on the third alignment area AA3, an alignment signal may be applied from the third signal applying pad AP3 to the third alignment wiring 730, but an alignment signal may not be applied to the first alignment wiring 710 and the second alignment wiring 720. Therefore, at the third time t3, a capacitor C3 may be formed only in the third alignment area AA3, and a capacitor may not be formed in the first alignment area AA1 and the second alignment area AA2.

[0259] That is, when the light emitting element 300 is applied to the alignment area AA at times t1, t2, and t3, the alignment signal may be applied only to the alignment area AA to form a capacitance on a portion of the display panel 10. The times t1, t2, and t3 at which the light emitting element 300 is applied to the alignment area AA may be synchronized with the time at which the alignment signal is applied to the alignment area AA. Therefore, the light emitting element 300 applied to the alignment area AA may be prevented from being misaligned on another alignment area AA adjacent to the alignment area AA.

[0260] In addition, in the case of the second alignment wiring 720 and the third alignment wiring 730, the second alignment wiring branch portion 720B is not disposed in the first alignment area AA1 and the third alignment area AA3, and the third alignment wiring branch portion 730B is not disposed in the first alignment area AA1 and the second alignment area AA2. This minimizes the unnecessary resistance value of each alignment wiring 700, thereby minimizing the drop in the applied voltage.

[0261] For example, when the light emitting element 300 is aligned by the second alignment wiring 720 in the second alignment area AA2, since the second alignment wiring branch portion 720B is not provided in the first alignment area AA1, no capacitance is formed in the first alignment area AA1. This means that the voltage applied from the second signal application pad AP2 is not consumed to form an unnecessary capacitance. Therefore, a high voltage can be applied to the second alignment area AA2 located relatively far from the second signal application pad AP2, and a voltage sufficient to align the light emitting element 300 can be applied to the second alignment wiring branch portion 720B. Obviously, the same is true for the first alignment wiring 710 and the third alignment wiring 730, and therefore a detailed description of the first alignment wiring 710 and the third alignment wiring 730 will be omitted.

[0262] In other words, for each alignment area AA of the display panel 10, a different alignment wiring 700 can be used to align the light emitting element 300. Therefore, the light emitting element 300 can be aligned with a uniform alignment degree over the entire area of ​​the display panel 10, and the maximum applied current value required for aligning the light emitting element 300 can be reduced.

[0263] Next, refer to Fig.13 At a fourth time (T=t4) after the nozzle for applying the coating solution S passes the display panel 10, no alignment signal is applied from the signal applying pads AP1 to AP3. The light emitting element 300 is aligned in each of the alignment areas AA1 to AA3, and the coating solution S is removed by volatilization.

[0264] After aligning the light emitting element 300 between the ground wiring branch portion 600B and the alignment wiring branch portion 700B provided in each alignment area AA, each ground wiring branch portion 600B is cut along the cutting line CB. Therefore, each segment of each ground wiring branch portion 600B can form one pixel PX or one sub-pixel PX1, PX2 or PX3 together with the alignment wiring branch portion 700B facing the segment.

[0265] Fig.14 is a circuit diagram schematically illustrating a capacitor formed in each alignment region during manufacture of a display panel according to an embodiment.

[0266] Reference Fig.14 , described above Figures 9 to 13 The time T in can be understood as the initial time t0, the first time t1, the second time t2, the third time t3 and the fourth time t4 respectively.

[0267] First, at the initial time t0, no alignment signal is applied. Therefore, a plurality of ground wirings 600 and a plurality of alignment wirings 700 are placed on the lower substrate SUB of the display panel 10.

[0268] Next, at the first time t1, the coating solution S is coated on the first alignment area AA1, and an alignment signal is applied through the first alignment wiring 710. The first alignment wiring branch portion 710B of the first alignment wiring 710 is disposed only in the first alignment area AA1. Therefore, a capacitance C1 caused by an electric field is formed in the first alignment area AA1, and no capacitance is formed in the second alignment area AA2 and the third alignment area AA3.

[0269] Next, at the second time t2, the coating solution S is coated on the second alignment area AA2, and the alignment signal is applied through the second alignment wiring 720. The second alignment wiring branch portion 720B of the second alignment wiring 720 is only provided in the second alignment area AA2. Therefore, a capacitance C2 due to the electric field is formed in the second alignment area AA2, and no capacitance is formed in the first alignment area AA1 and the third alignment area AA3. Specifically, since the capacitance C2 is formed only in the second alignment area AA2 by passing through the first alignment area AA1, the voltage drop of the alignment signal is minimized. That is, the capacitance C2 formed in the second alignment area AA2 at the second time t2 may have the same strength as the capacitance C1 formed in the first alignment area AA1 at the first time t1. Since this is also true for the third time t3, a detailed description of the third time t3 will be omitted.

[0270] Finally, at the fourth time t4, the light emitting element 300 is aligned in the display area DA. Therefore, no alignment signal is applied to the alignment wirings 710 to 730. That is, no capacitance due to the electric field is formed.

[0271] Although not shown in the drawings, a plurality of members (eg, contact electrodes 260 and an insulating layer) placed on the light emitting element 300 after the light emitting element 300 is aligned may be formed by a conventional patterning process. This will not be described in detail.

[0272] Next, we will refer to Fig.15 A display panel 10_1 according to another embodiment is described.

[0273] Fig.15 is a plan view of a display panel according to another embodiment. Fig.15 , and reference can be made to the previous drawings.

[0274] and Figure 5 Compared with the display panel 10, Fig.15The display panel 10_1 may include a greater number of alignment areas AA. As described above, the alignment area AA may not necessarily extend in the first direction D1 to have a linear shape. In addition, in some cases, the ground wiring 600 and the alignment wiring 700 may be disposed in the display area DA.

[0275] Reference Fig.15 ,exist Fig.15 In the display panel 10_1 of FIG. 1 , a plurality of ground wirings 600 and a plurality of alignment wirings 700 are disposed in the first non-display area NDA1 and the second non-display area NDA2, and a plurality of ground wirings 600 and a plurality of alignment wirings 700 may also be disposed in the display area DA. The ground wirings 600 and the alignment wirings 700 disposed in the first non-display area NDA1 and the second non-display area NDA2 are similar to those described above with reference to FIG. Figure 5 Therefore, the ground wiring and the alignment wiring provided in the display area DA will be described in detail below.

[0276] exist Fig.15 In the embodiment, two ground wiring rod portions 600S_1 extend in the second direction D2 in the display area DA. The ground wiring rod portions 600S_1 may form a pair with each other and form a pair with the ground wiring rod portions 600S disposed in the first non-display area NDA1 and the second non-display area NDA2, respectively. That is, Fig.15 The display panel 10_1 may be divided into three regions along the first direction D1 by a total of four ground wiring rod portions 600S and 600S_1 .

[0277] In addition, a total of six alignment wiring rod portions 700S_1 may extend in the second direction D2 in the display area DA. The alignment wiring rod portion 700S_1 includes a first alignment wiring rod portion 710S_1, a second alignment wiring rod portion 720S_1, and a third alignment wiring rod portion 730S_1. The alignment wiring rod portions 710S_1, 720S_1, and 730S_1 may form a pair with each other, respectively, and form a pair with the first alignment wiring rod portion 710S, the second alignment wiring rod portion 720S, and the third alignment wiring rod portion 730S disposed in the first non-display area NDA1 and the second non-display area NDA2, respectively.

[0278] Each of the alignment wiring bar portions 700S and 700S_1 may extend to one side of the display panel 10_1 so as to be connected to a signal applying pad (not shown), and may extend toward the other side in the second direction D2. As described above, since the alignment wiring bar portions 700S and 700S_1 extend to reach different alignment areas AA, they may have different lengths. Fig.15, the first alignment bar portions 710S and 710S_1 may extend to reach the first alignment area AA1, the second alignment bar portions 720S and 720S_1 may extend to reach the second alignment area AA2, and the third alignment bar portions 730S and 730S_1 may extend to reach the third alignment area AA3.

[0279] Therefore, it is possible to align the wiring rod portions 710S, 720S, and 730S and 710S_1, 720S_1, and 730S_1 with three types of alignment rod portions 710S, 720S, and 730S having different lengths. Fig.15 The display panel 10_1 is divided into three areas along the second direction D2.

[0280] As described above, the area where each ground wiring bar portion 600S or 600S_1 overlaps with each alignment wiring bar portion 710S, 720S or 730S or 710S_1, 720S_1 or 730S_1 may be defined as an alignment area AA. Fig.15 A total of nine alignment areas AA1 to AA9 may be defined in FIG. Different ground wiring branch portions (not shown) and alignment wiring branch portions (not shown) may be disposed in each alignment area AA.

[0281] The ground wiring rod portions 600S and 600S_1 and the alignment wiring rod portions 700S and 700S_1 may have symmetrical structures with respect to the display area DA or each alignment area AA, or may have the same structure.

[0282] For example, the ground wiring rod portion 600S_1 and the alignment wiring rod portion 710S_1 to 730S_1 disposed in the display area DA may have the same structure as the ground wiring rod portion 600S and the alignment wiring rod portion 710S to 730S disposed in the first non-display area NDA1. On the other hand, the ground wiring rod portion 600S_1 and the alignment wiring rod portion 710S_1 to 730S_1 disposed in the display area DA may have a symmetrical structure with the ground wiring rod portion 600S and the alignment wiring rod portion 710S to 730S disposed in the second non-display area NDA2 relative to the row provided with the seventh alignment area AA7. However, the present disclosure is not limited to this case. In some cases, the ground wiring rod portion 600S_1 and the alignment wiring rod portion 710S_1 to 730S_1 disposed in the display area DA may have a symmetrical structure with the ground wiring rod portion 600S and the alignment wiring rod portion 710S to 730S disposed in the first non-display area NDA1.

[0283] In addition, Figure 5 Different in Fig.15The ground wiring 600 of the display panel 10_1 may include a bridge wiring BL in some parts. A path of a ground wiring branch portion (not shown) branched from a ground wiring rod portion 600S_1 disposed in the display area DA may be blocked. Therefore, the ground wiring rod portion 600S_1 may be connected to the ground wiring branch portion (not shown) through the fourth bridge wiring BL4.

[0284] Fig.15 The display panel 10_1 of FIG. 10_1 includes a total of nine alignment areas AA and the ground wiring 600 further includes a fourth bridge wiring BL4. Figure 5 Therefore, redundant description is omitted.

[0285] Although the present disclosure has been specifically shown and described with reference to the exemplary embodiments of the present disclosure, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the appended claims. The exemplary embodiments should be considered in a descriptive sense only and not for purposes of limitation.

Claims

1. A display device, comprising: a first region extending in a first direction; a second region extending in the first direction and arranged side by side with the first region in a second direction intersecting the first direction; At least one first light-emitting element, disposed in the first region; At least one second light-emitting element, disposed in the second area; at least one first wiring connected to one end of the first light emitting element in the first region and having at least a portion extending in the first direction; at least one second wiring connected to one end of the second light emitting element in the second region and having at least a portion extending in the first direction; as well as a third wiring having at least a portion extending from a first side of the first region to a second side of the second region in the second direction, wherein the first wiring and the second wiring are electrically insulated from each other, the first wiring includes a first wiring branch portion extending in the first direction in the first region and a first wiring stem portion extending from the first side of the first region to a second side of the first region in the second direction, the second wiring includes a second wiring branch portion extending in the first direction in the second region and a second wiring stem portion extending in the second direction from the first side of the first region to the second side of the second region, and The third wiring includes at least one third wiring branch portion extending in the first direction and a third wiring bar portion extending in the second direction, each of the at least one third wiring branch portion being spaced apart from the third wiring bar portion in the first direction.

2. The display device according to claim 1, wherein: The third wiring branch portion has at least some portions extending in the first direction and spaced apart from each other in the first region and the second region.

3. The display device according to claim 2, wherein: The third wiring branch portion is connected to the other end of the first light emitting element in the first region, and is connected to the other end of the second light emitting element in the second region.

4. The display device according to claim 1, comprising: A display area extending in the second direction; as well as a non-display area extending in the second direction and located on both sides of the display area in the first direction, Wherein, the first wiring rod portion, the second wiring rod portion and the third wiring rod portion are arranged in the non-display area.

5. The display device according to claim 4, wherein: The non-display area includes a first non-display area located on one side of the display area and a second non-display area located on the other side of the display area.

6. The display device according to claim 5, wherein: The first wiring rod portion includes a first-first sub-wiring rod portion disposed in the first non-display area and a first-second sub-wiring rod portion disposed in the second non-display area, the second wiring rod portion includes a second-first sub wiring rod portion disposed in the first non-display area and a second-second sub wiring rod portion disposed in the second non-display area, and The third wiring bar portion includes a third-first sub wiring bar portion disposed in the first non-display area and a third-second sub wiring bar portion disposed in the second non-display area.

7. The display device according to claim 6, wherein: The third wiring branch portion has one end spaced apart from the third-first sub-wiring bar portion and the other end spaced apart from the third-second sub-wiring bar portion, The first wiring branch portion has two ends connected to the first-first sub-wiring rod portion and the first-second sub-wiring rod portion, respectively, and The second wiring branch portion has both ends connected to the second-first sub wiring bar portion and the second-second sub wiring bar portion, respectively.

8. The display device according to claim 1, further comprising: A first wiring layer, comprising the first wiring, the second wiring and the third wiring; as well as The second wiring layer is located on the first wiring layer and includes a first bridge wiring connecting the first wiring stem portion and the first wiring branch portion, and a second bridge wiring connecting the second wiring stem portion and the second wiring branch portion.

9. The display device according to claim 3, further comprising: a third region extending in the first direction and located on the second side of the second region; as well as a fourth wiring including a fourth wiring rod portion extending from the first side of the first area to the second side of the third area in the second direction, and a fourth wiring branch portion branched from the fourth wiring rod portion and disposed in the third area, The fourth wiring is electrically insulated from the first wiring and the second wiring.

10. The display device according to claim 9, wherein: The third wiring rod portion extends from the first side of the first region to the second side of the third region in the second direction, and the third wiring branch portion branches from the third wiring rod portion and is disposed in the third region. 11 . The display device according to claim 10 , further comprising a third light emitting element having one end connected to the third wiring branch portion and the other end connected to the fourth wiring branch portion in the third region.

12. The display device according to claim 1, wherein: A length of the first wiring bar portion measured in the second direction is shorter than a length of the second wiring bar portion measured in the second direction.

13. A method for manufacturing a display device, the method comprising: preparing a lower substrate including at least one ground wiring and an alignment wiring spaced apart from the ground wiring to face the ground wiring; as well as aligning the light emitting element between the ground wiring and the alignment wiring by coating a coating solution containing the light emitting element on at least a portion of the lower substrate and applying an AC power to the alignment wiring, wherein the lower substrate includes a first region extending in a first direction and a second region arranged side by side with the first region in a second direction intersecting the first direction, and the alignment wiring includes a first alignment wiring arranged in the first region and a second alignment wiring arranged in the second region, The ground wiring comprises: a first ground wiring spaced apart from the first alignment wiring in the first region to face the first alignment wiring; and a second ground wiring spaced apart from the second alignment wiring in the second region to face the second alignment wiring, Aligning the light emitting element comprises: At a first time, the light emitting element is aligned between the first alignment wiring and the first ground wiring by coating the coating solution on at least a portion of the first region and applying the AC power to the first alignment wiring to form a first electric field between the first alignment wiring and the first ground wiring; At a second time different from the first time, removing the first electric field, and aligning the light emitting element between the second alignment wiring and the second ground wiring by coating the coating solution on at least a portion of the second region and applying the AC power to the second alignment wiring to form a second electric field between the second alignment wiring and the second ground wiring; and At a third time different from the first time and the second time, the second electric field is removed, and each of the first ground wiring and the second ground wiring is partially patterned to form at least one segment arranged at predetermined intervals.

14. The method according to claim 13, wherein: The coating solution is sequentially coated from a first side of the first region to a second side of the second region.

15. The method according to claim 13, wherein: The light emitting elements include a first light emitting element aligned between the first alignment wiring and the first ground wiring and a second light emitting element aligned between the second alignment wiring and the second ground wiring.

16. The method according to claim 15, wherein: At the first time, one end of the first light emitting element is connected to the first alignment wiring and the other end of the first light emitting element is connected to the first ground wiring.

17. The method according to claim 16, wherein: The second electric field has the same strength as the first electric field, and at the second time, one end of the second light emitting element is connected to the second alignment wiring and the other end of the second light emitting element is connected to the second ground wiring.

18. The method according to claim 13, wherein: The first alignment wiring includes a first wiring branch portion extending in the first direction in the first region and a first wiring stem portion extending from a first side of the first region to a second side of the first region in the second direction, the second alignment wiring includes a second wiring branch portion extending in the first direction in the second region and a second wiring stem portion extending in the second direction from the first side of the first region to the second side of the second region, and A length of the first wiring bar portion measured in the second direction is shorter than a length of the second wiring bar portion measured in the second direction.

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