Display devices

Abstract

A display device is disclosed, comprising a substrate, a plurality of pixels, a first light-emitting element, a second light-emitting element, and a color conversion layer, wherein the substrate comprises a display area and a non-display area, the plurality of pixels are arranged in the display area, the plurality of pixels comprise a first sub-pixel, a second sub-pixel, and a third sub-pixel, each having a light-emitting area configured to emit light, the first light-emitting element being arranged in each of the first sub-pixel and the second sub-pixel and emitting light of a first color, the second light-emitting element being arranged in the third sub-pixel and emitting light of a second color, the color conversion layer corresponding to each of the first sub-pixel and the second sub-pixel, and the color conversion layer converting the first color light into light of a set color for each corresponding sub-pixel.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2018-0043383, filed on April 13, 2018, in the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference. Technical Field

[0003] Embodiments of the present disclosure generally relate to display devices. Background Art

[0004] Light emitting diodes (hereinafter referred to as LEDs) exhibit relatively satisfactory durability even under harsh environmental conditions and have excellent performance in terms of lifespan and brightness. Recently, research on applying such LEDs to various light emitting devices has been actively conducted.

[0005] As part of these studies, there are technologies for producing micro-rod-type LEDs as small as micrometers or nanometers using inorganic crystal structures (e.g., structures in which nitride-based semiconductors are grown). For example, rod-type LEDs can be manufactured to have a size small enough to form pixels in self-luminous display panels, etc. Summary of the Invention

[0006] An embodiment of the present disclosure provides a display device including a stick-type LED.

[0007] According to aspects of an embodiment of the present disclosure, a display device is provided, which includes a substrate, a plurality of pixels, a first light-emitting element and a second light-emitting element, and a color conversion layer, wherein the substrate includes a display area and a non-display area, the plurality of pixels are arranged in the display area, the plurality of pixels include a first sub-pixel, a second sub-pixel, and a third sub-pixel, each having a light-emitting area configured to emit light, the first light-emitting element is arranged in each of the first sub-pixel and the second sub-pixel and is configured to emit a first color light, the second light-emitting element is arranged in the third sub-pixel and is configured to emit a second color light, the color conversion layer corresponds to each of the first sub-pixel and the second sub-pixel, and the color conversion layer converts the first color light into light of a set (or specific) color for each corresponding sub-pixel.

[0008] The first color light and the second color light may include blue-based light, and the first color light may have a wavelength shorter than that of the second color light.

[0009] The color conversion layer may include a first color conversion pattern, a second color conversion pattern, and a light-blocking pattern, wherein the first color conversion pattern corresponds to the first sub-pixel and is configured to convert the first color light into red light, the second color conversion pattern corresponds to the second sub-pixel and is configured to convert the first color light into green light, and the light-blocking pattern is disposed between the first color conversion pattern and the second color conversion pattern.

[0010] The first color conversion pattern may include red quantum dots, and the second color conversion pattern may include green quantum dots.

[0011] The color conversion layer may further include a third color conversion pattern corresponding to the third sub-pixel and configured to allow the second color light to pass through the third color conversion pattern. The third color conversion pattern may include any one of a transparent layer and a blue color filter.

[0012] The display device may further include an anti-reflection layer disposed on the color conversion layer. The anti-reflection layer may include any one of a color filter layer and a polarizing film.

[0013] Each of the first and second light emitting elements may include a first semiconductor layer doped with a first conductive dopant, a second semiconductor layer doped with a second conductive dopant, and an active layer disposed between the first and second semiconductor layers.

[0014] Each of the first and second light emitting elements may include a light emitting diode having a micrometer or nanometer scale and having a cylindrical column shape or a polygonal column shape.

[0015] Each of the first light emitting element and the second light emitting element may be provided on a substrate and have a first end portion and a second end portion in a length direction.

[0016] The display device may also include a first electrode, a second electrode, a first contact electrode and a second contact electrode, wherein: the first electrode is arranged on the substrate, and the first electrode is adjacent to the first end of each of the first light-emitting element and the second light-emitting element; the second electrode is arranged on the same plane as the first electrode, and the second electrode is adjacent to the second end of each of the first light-emitting element and the second light-emitting element; the first contact electrode electrically connects the first electrode to the first end of each of the first light-emitting element and the second light-emitting element; and the second contact electrode electrically connects the second electrode to the second end of each of the first light-emitting element and the second light-emitting element.

[0017] Each of the first sub-pixel, the second sub-pixel, and the third sub-pixel may include at least one transistor disposed on the substrate to be coupled to a corresponding light emitting element.

[0018] The display apparatus may further include a planarization layer disposed on the color conversion layer to cover the color conversion layer.

[0019] According to another aspect of an embodiment of the present disclosure, a display device is provided, which includes a substrate, a plurality of pixels, a light-emitting element, and a color conversion layer, wherein: the substrate includes a display area and a non-display area; the plurality of pixels are arranged in the display area, and the plurality of pixels include a first sub-pixel, a second sub-pixel, and a third sub-pixel, each having a light-emitting area configured to emit light; the light-emitting element is arranged in each of the first sub-pixel, the second sub-pixel, and the third sub-pixel, and the light-emitting element is configured to emit light; the color conversion layer is arranged in the first sub-pixel, the second sub-pixel, and the third sub-pixel, and the color conversion layer is configured to convert the light into light of a set (or specific) color for each sub-pixel, wherein the light-emitting element includes a first light-emitting element configured to emit a first color light and a second light-emitting element configured to emit a second color light, wherein the first light-emitting element and the second light-emitting element are mixed and arranged in each of the first sub-pixel, the second sub-pixel, and the third sub-pixel. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Exemplary embodiments will now be described in more detail below with reference to the accompanying drawings; however, the subject matter of the present disclosure can be embodied in different forms and should not be construed as 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 exemplary embodiments to those skilled in the art.

[0021] In the accompanying drawings, dimensions may be exaggerated for clarity of illustration. It should be understood that when an element is referred to as being "between" two elements or layers, it can be the only element between the two elements, or one or more intervening elements may also be present. Throughout the specification, the same reference numerals represent the same elements.

[0022] Figure 1 is a perspective view showing a rod-type light emitting diode (LED) according to an embodiment of the present disclosure.

[0023] Figures 2A to 2B is a circuit diagram illustrating a unit light emitting area of ​​a light emitting device according to an embodiment of the present disclosure.

[0024] Figure 3 It is shown that Figure 1 A plan view of a unit light-emitting area of ​​a rod-type LED light-emitting device.

[0025] Figure 4A It is along Figure 3 A cross-sectional view taken along line II'.

[0026] Figure 4B It shows Figure 3 Another embodiment of the unit light emitting area of ​​the light emitting device Figure 3 The cross-sectional view corresponding to the line II'.

[0027] Figure 5 This is a diagram showing the embodiment of the present disclosure. Figure 1 Schematic plan view of a display device in which a rod-type LED shown in FIG. 1 is used as a light source.

[0028] Figure 6 It is schematically shown Figure 5 ] is a plan view of first to third sub-pixels included in one of the pixels shown in FIG.

[0029] Figure 7 It is along Figure 6 A cross-sectional view taken along line II-II'.

[0030] Figure 8A is a graph showing the absorption coefficients of red and green quantum dots relative to the wavelength of incident light, and Figure 8B is a graph showing changes in light emission efficiency of red quantum dots and green quantum dots with respect to changes in the wavelength of incident light.

[0031] Figures 9 to 15 is shown in order to manufacture Figure 7 A cross-sectional view of the method of the first sub-pixel to the third sub-pixel shown in FIG.

[0032] Figure 16 is with Figure 6 Line II-II' corresponds to and illustrates a cross-sectional view of a display device according to another embodiment of the present disclosure.

[0033] Figure 17 It shows Figure 5 0 is a plan view of another embodiment of first to third sub-pixels included in one of the pixels shown in . DETAILED DESCRIPTION

[0034] The scope of the present disclosure includes various modifications and variations of the disclosed subject matter, and specific examples are used to illustrate embodiments of the present disclosure in more detail. However, the examples do not limit the present disclosure to a particular form, but rather, the present disclosure is intended to cover various modifications and equivalent arrangements, materials, and alternatives within the spirit and scope of the appended claims and their equivalents. In order to better understand the subject matter of the present disclosure, the drawings may be shown in an expanded manner.

[0035] Throughout the text, the same reference numerals represent the same elements. In the accompanying drawings, the thickness of certain lines, layers, components, elements or features may be exaggerated for clarity. It should be understood that although the terms "first", "second" and the like 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. Therefore, without departing from the spirit and scope of the present disclosure, the "first" element discussed below may also be referred to as the "second" element. As used herein, unless the context clearly indicates otherwise, the singular form is intended to also include the plural form.

[0036] It should also be understood that the terms “includes” and / or “including” when used in this specification indicate the presence of the features, integers, steps, operations, elements and / or components being described, but do not exclude the presence and / or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof. Furthermore, the expression that an element, such as a layer, region, substrate or plate, is placed “on” or “over” another element not only indicates that the element is placed “directly” “on” or “directly above” the other element, but also indicates that another element is interposed between the element and the other element. Furthermore, the expression that an element, such as a layer, region, substrate or plate, is placed “below” or “beneath” another element not only indicates that the element is placed “directly” “below” or “directly below” the other element, but also indicates that another element is interposed between the element and the other element.

[0037] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0038] Figure 1 1 is a perspective view showing a rod-type light emitting diode according to an embodiment of the present disclosure. Figure 1 An embodiment of a cylindrical rod-type light emitting diode LD is shown, but the present disclosure is not limited thereto.

[0039] Reference Figure 1 The rod-type light emitting diode LD according to an embodiment of the present disclosure may include a first semiconductor layer 11 , a second semiconductor layer 13 , and an active layer 12 interposed between the first semiconductor layer 11 and the second semiconductor layer 13 .

[0040] In an example, the rod-type light emitting diode LD may be implemented as a stack structure having a first semiconductor layer 11, an active layer 12, and a second semiconductor layer 13 sequentially stacked. Hereinafter, for convenience of description, the rod-type light emitting diode LD is referred to as a "rod-type LED LD."

[0041] In an embodiment of the present disclosure, the rod-type LED LD is provided in a rod shape extending in one direction. When assuming that the extending direction of the rod-type LED LD is the length direction, the rod-type LED LD may have one end and the other end along the length direction.

[0042] In an embodiment of the present disclosure, one of the first semiconductor layer 11 and the second semiconductor layer 13 may be disposed at one end, and the other of the first semiconductor layer 11 and the second semiconductor layer 13 may be disposed at the other end.

[0043] In an embodiment of the present disclosure, the rod-type LED LD may be provided in a cylindrical shape. However, the present disclosure is not limited thereto. For example, the term "rod-type" may include a rod-like shape or a rod-like shape that is long in its length direction (i.e., its aspect ratio is greater than 1), such as a cylindrical column or a polygonal column. For example, the length of the rod-type LED LD may be greater than its diameter. According to an embodiment of the present disclosure, a "rod-type light-emitting diode" may have any suitable elongated shape with an aspect ratio greater than 1.

[0044] The rod-type LED LD can be made small enough to have a diameter and / or length of, for example, micrometer or nanometer order (for example, the diameter and / or length of the rod-type LED LD can be in the range of 1 nm to 100 μm, such as 1 nm to 100 nm or 1 μm to 100 μm).

[0045] However, the size of the stick-type LED LD according to the embodiment of the present disclosure is not limited thereto and may be changed to correspond to desired or required conditions of a display device to which the stick-type LED LD is applied.

[0046] The first semiconductor layer 11 may include, for example, at least one n-type semiconductor layer. For example, the first semiconductor layer 11 may include at least one semiconductor material selected from the group consisting of InAlGaN, GaN, AlGaN, InGaN, AlN, and InN, and may be doped with a first conductive dopant such as Si, Ge, or Sn.

[0047] The material constituting the first semiconductor layer 11 is not limited thereto, and various appropriate materials may be included in the first semiconductor layer 11 .

[0048] The active layer 12 is formed on the first semiconductor layer 11 and may be formed to have a single or multiple quantum well structure. In an embodiment of the present disclosure, a capping layer doped with a conductive dopant may be formed on the top and / or bottom of the active layer 12. In an example, the capping layer may be implemented as an AlGaN layer or an InAlGaN layer. It will be apparent that materials such as AlGaN or AlInGaN may also be used for the active layer 12.

[0049] When an electric field of a set or predetermined voltage or more is applied to both ends of the stick type LED LD, electron-hole pairs are combined in the active layer 12 , causing the stick type LED LD to emit light (eg, the stick type LED LD is configured to emit light).

[0050] The second semiconductor layer 13 is formed on the active layer 12 and may include a semiconductor layer having a different type (e.g., n-type or p-type) from the first semiconductor layer 11. In an example, the second semiconductor layer 13 may include at least one p-type semiconductor layer. For example, the second semiconductor layer 13 may include at least one semiconductor material selected from InAlGaN, GaN, AlGaN, InGaN, AlN, and InN, and may include a semiconductor layer doped with a second conductive dopant such as Mg.

[0051] The material constituting the second semiconductor layer 13 is not limited thereto, and various materials may be included in the second semiconductor layer 13 .

[0052] In an embodiment of the present disclosure, in addition to the first semiconductor layer 11, the active layer 12 and the second semiconductor layer 13, the rod-type LED LD may further include another phosphor layer, another active layer, another semiconductor layer and / or another electrode layer located on the top and / or bottom of each layer.

[0053] In addition, the rod-type LED LD may further include an insulating film 14. However, in an embodiment of the present disclosure, the insulating film 14 may be omitted or provided to cover only a portion of the first semiconductor layer 11, the active layer 12, and the second semiconductor layer 13.

[0054] For example, the insulating film 14 may be provided at a portion of the stick-type LED LD except for both ends of the stick-type LED LD, thereby exposing both ends of the stick-type LED LD.

[0055] For the convenience of description, Figure 1 A state in which a part of the insulating film 14 is removed is shown. However, the side surface of the cylindrical stick-type LED LD may be actually surrounded by the insulating film 14 (for example, completely surrounded).

[0056] The insulating film 14 may be disposed to surround at least a portion of an outer surface of the first semiconductor layer 11, the active layer 12, and / or the second semiconductor layer 13. In an example, the insulating film 14 may be disposed to surround at least an outer surface of the active layer 12.

[0057] In an embodiment of the present disclosure, the insulating film 14 may include a transparent insulating material. For example, the insulating film 14 may include at least one insulating material selected from the group consisting of SiO2, Si3N4, Al2O3, and TiO2. However, the present disclosure is not limited thereto, and various suitable materials having insulating properties (e.g., electrical insulating properties) may be used.

[0058] When the insulating film 14 is provided to the rod-type LED LD, the active layer 12 can be prevented from being short-circuited with the first electrode and / or the second electrode (or the possibility of such a short-circuit can be reduced).

[0059] Furthermore, due to the formation of the insulating film 14, surface defects of the stick-type LED LD can be minimized or reduced, thereby improving the lifespan and efficiency of the stick-type LED LD. Furthermore, when a plurality of stick-type LED LDs are densely arranged, the insulating film 14 can prevent (or reduce the likelihood of) an undesirable short circuit that may occur between the stick-type LED LDs.

[0060] The above-mentioned rod-type LED LD can be used as a light source for various appropriate display devices. In an example, the rod-type LED LD can be used as a light source for a lighting device or a self-luminous display device.

[0061] Figures 2A to 2B is a circuit diagram illustrating a unit light emitting area of ​​a light emitting device according to an embodiment of the present disclosure.

[0062] For example, Figures 2A to 2B An example of a sub-pixel SP constituting an active light emitting display panel is shown. In an embodiment of the present disclosure, a unit light emitting region may include one sub-pixel SP.

[0063] Reference Figure 2A , the sub-pixel SP may include at least one stick-type LED LD and a driving circuit 144 coupled to (eg, connected to) the stick-type LED LD to drive the stick-type LED LD.

[0064] A first electrode (eg, an anode electrode) of the stick type LED LD is coupled to a first power source VDD via the driving circuit 144 , and a second electrode (eg, a cathode electrode) of the stick type LED LD is coupled to a second power source VSS.

[0065] The first power source VDD and the second power source VSS may have different potentials. In an example, the second power source VSS may have a potential lower than the first power source VDD by a threshold voltage of the stick type LED LD or more.

[0066] The rod-type LED LD may be configured to emit light having brightness corresponding to a driving current controlled by the driving circuit 144 .

[0067] On the other hand, although Figure 2A An embodiment in which only one rod-type LED LD is included in the sub-pixel SP is disclosed, but the present disclosure is not limited thereto. For example, the sub-pixel SP may include a plurality of rod-type LED LDs coupled in parallel (eg, connected in parallel) to each other.

[0068] In an embodiment of the present disclosure, the driving circuit 144 may include a first transistor M1, a second transistor M2, and a storage capacitor Cst. However, the structure of the driving circuit 144 is not limited to Figure 2A The embodiment shown in .

[0069] A first electrode of a first transistor (switching transistor) M1 is coupled to a data line Dj, and a second electrode of the first transistor M1 is coupled to a first node N1. The first electrode and the second electrode of the first transistor M1 are different electrodes. For example, when the first electrode is a source electrode, the second electrode may be a drain electrode. In addition, a gate electrode of the first transistor M1 is coupled to a scan line Si.

[0070] The first transistor M1 is turned on when a scan signal having a voltage (e.g., a low voltage) that turns on the first transistor M1 is supplied from the scan line Si, so that the data line Dj and the first node N1 are electrically coupled to each other. The data signal of the corresponding frame is supplied to the data line Dj. Therefore, the data signal is transmitted to the first node N1. The data signal transmitted to the first node N1 is charged into the storage capacitor Cst.

[0071] A first electrode of a second transistor (driving transistor) M2 is coupled to a first power supply VDD, and a second electrode of the second transistor M2 is coupled to a first electrode of the rod-type LED LD. Furthermore, a gate electrode of the second transistor M2 is coupled to a first node N1. The second transistor M2 controls the amount of driving current supplied to the rod-type LED LD in response to the voltage at the first node N1.

[0072] One electrode of the storage capacitor Cst is coupled to the first power source VDD, and the other electrode of the storage capacitor Cst is coupled to the first node N1. The storage capacitor Cst is charged with a voltage corresponding to the data signal supplied to the first node N1 and maintains the charged voltage until a data signal of the next frame is supplied.

[0073] For convenience, Figure 2A The driving circuit 144 is shown to have a relatively simple structure including a first transistor M1 for transmitting a data signal to the sub-pixel SP, a storage capacitor Cst for storing the data signal, and a second transistor M2 for supplying a driving current corresponding to the data signal to the stick-type LED LD.

[0074] However, the present disclosure is not limited thereto, and the structure of the driving circuit 144 may be modified and implemented differently. In an example, it will be apparent that the driving circuit 144 may further include at least one transistor device or another circuit device, wherein the transistor device, such as a transistor device for compensating the threshold voltage of the second transistor M2, a transistor device for initializing the first node N1, and / or a transistor device for controlling the light emission time of the stick-type LED LD, and the other circuit device, such as a boosting capacitor for boosting the voltage of the first node N1.

[0075] In addition, although Figure 2A Although all transistors (eg, the first transistor M1 and the second transistor M2 included in the driving circuit 144) are p-type transistors, the present disclosure is not limited thereto. In other words, at least one of the first transistor M1 and the second transistor M2 included in the driving circuit 144 may be changed to an n-type transistor.

[0076] Reference Figure 2B In the embodiment of the present disclosure, the first transistor M1 and the second transistor M2 can be implemented as n-type transistors. In addition to the connection positions of some components being changed due to the change of transistor types, Figure 2B The configuration and operation of the drive circuit 144 shown in FIG. Figure 2A The configuration and operation of the driving circuit 144 are similar. Therefore, this article will not repeat Figure 2B , which is a redundant description of the driver circuit 144 shown in FIG.

[0077] Figure 3 It is shown that Figure 1 A plan view of a unit light-emitting area of ​​a rod-type LED LD light-emitting device. Figure 4A It is along Figure 3 A cross-sectional view taken along line II'.

[0078] Although Figure 3 For convenience of description, the rod-type LEDs LD are shown aligned in the horizontal direction, but the alignment of the rod-type LEDs LD is not limited thereto. For example, the rod-type LEDs LD may be aligned in the diagonal direction between the first and second electrodes.

[0079] In addition, Figure 3 In the embodiment, the unit light emitting region may be a pixel region including one sub-pixel SP of the light emitting display panel. Figure 3 An embodiment in which one rod-type LED LD is disposed in a unit light emitting region is shown, but the present disclosure is not limited thereto. For example, a plurality of rod-type LED LDs may be disposed in a unit light emitting region.

[0080] Reference Figures 1 to 4A, a light emitting device according to an embodiment of the present disclosure may include a substrate SUB, first and second electrodes EL1 and EL2 , a rod-type LED LD, and first and second contact electrodes CNE1 and CNE2 .

[0081] The substrate SUB may include an insulating material such as glass, an organic polymer, or quartz. The substrate SUB may be made of a flexible material so as to be bendable or foldable. The substrate SUB may have a single-layer or multi-layer structure.

[0082] For example, the substrate SUB may include at least one of polystyrene, polyvinyl alcohol, polymethyl methacrylate, polyethersulfone, polyacrylate, polyetherimide, polyethylene naphthalate, polyethylene terephthalate, polyphenylene sulfide, polyarylate, polyimide, polycarbonate, cellulose triacetate, and cellulose acetate propionate. However, the material constituting the substrate SUB may be variously modified.

[0083] The first electrode EL1 and the second electrode EL2 may be disposed on the substrate SUB. When viewed on a plane, the first electrode EL1 and the second electrode EL2 may be disposed on the substrate SUB to be spaced apart from each other with the rod-type LED LD interposed therebetween.

[0084] The first electrode EL1 and the second electrode EL2 may be disposed on the same plane and have the same height. When the first electrode EL1 and the second electrode EL2 have the same height, the rod-type LED LD may be more stably coupled to the first electrode EL1 and the second electrode EL2.

[0085] The first electrode EL1 and the second electrode EL2 may be made of a conductive material. The conductive material may include: a metal such as Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, or any alloy thereof; a conductive oxide such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), or indium tin zinc oxide (ITZO); a conductive polymer such as PEDOT, etc.

[0086] In addition, the first and second electrodes EL1 and EL2 may be formed as a single layer. However, the present disclosure is not limited thereto, and the first and second electrodes EL1 and EL2 may be formed as multiple layers in which two or more materials among metals, alloys, conductive oxides, and conductive polymers are stacked.

[0087] The materials of the first electrode EL1 and the second electrode EL2 are not limited to the above materials. For example, the first electrode EL1 and the second electrode EL2 may be made of a conductive material having a constant reflectivity so that light emitted from both ends of the rod-type LED LD advances in the direction of displaying an image (e.g., the front direction).

[0088] For convenience of description, the first electrode EL1 and the second electrode EL2 are shown to be directly disposed on the substrate SUB, but the present disclosure is not limited thereto. For example, components for driving the light emitting device in a passive matrix manner or an active matrix manner may be further disposed between the first electrode EL1 and the second electrode EL2 and the substrate SUB.

[0089] When the light emitting device is driven in an active matrix manner, a signal line, an insulating layer, and / or a transistor may be provided between the first and second electrodes EL1 and EL2 and the substrate SUB.

[0090] The signal line may include a scan line, a data line, a power line, etc. The transistor is coupled to the signal line and may include a gate electrode, a semiconductor layer, a source electrode, and a drain electrode.

[0091] One of the source electrode and the drain electrode of the transistor can be coupled to either of the first electrode EL1 and the second electrode EL2, and the data signal of the data line can be applied to one of the first electrode EL1 and the second electrode EL2 through the transistor. It will be apparent that the signal line, the insulating layer and / or the transistor can be provided in various numbers and configurations.

[0092] In an embodiment of the present disclosure, the first electrode EL1 may be coupled to the first connection line CNL1. The first connection line CNL1 may be integrally provided together with the first electrode EL1 and extend along the first direction DR1 when viewed on a plane.

[0093] In some embodiments, when the light emitting device is driven in an active matrix manner, the first connection line CNL1 may be electrically coupled to the driving voltage line DVL through a contact hole. Therefore, a signal of the driving voltage line DVL may be applied to the first electrode EL1 through the first connection line CNL1.

[0094] The second electrode EL2 may be coupled to a second connection line CNL2. The second connection line CNL2 may be integrally provided together with the second electrode EL2 and extend along the first direction DR1.

[0095] The second connection line CNL2 may be electrically coupled to the transistor through the contact hole. Therefore, a signal provided to the transistor may be applied to the second electrode EL2 through the second connection line CNL2.

[0096] The rod-type LED LD may be disposed between the first electrode EL1 and the second electrode EL2 on the substrate SUB. The rod-type LED LD may be self-aligned by the electric field formed between the first electrode EL1 and the second electrode EL2. The rod-type LED LD may be disposed in a rod shape extending in the first direction DR1.

[0097] The rod-type LED LD may include a first semiconductor layer 11, an active layer 12, and a second semiconductor layer 13. In some embodiments, the rod-type LED LD may further include an electrode layer disposed on top of the second semiconductor layer 13.

[0098] The electrode layer may include a metal or a metal oxide. For example, the electrode layer may be formed of one or a mixture of chromium (Cr), titanium (Ti), aluminum (Al), gold (Au), nickel (Ni), ITO, and oxides or alloys thereof, but the present disclosure is not limited thereto.

[0099] When including the electrode layer, the rod-type LED LD has a feature in that the second semiconductor layer 13 and the second electrode EL2 can be joined at a temperature lower than a temperature required in a process of forming the second contact electrode CNE2 at a joining point of the second semiconductor layer 13 and the second electrode EL2 .

[0100] The rod-type LED LD may include a first end portion EP1 and a second end portion EP2 along the first direction DR1. One of the first semiconductor layer 11 and the second semiconductor layer 13 may be disposed at the first end portion EP1, and the other may be disposed at the second end portion EP2.

[0101] A first insulating layer INS1 covering a portion of an upper surface of the stick-type LED LD may be disposed on the stick-type LED LD. Thus, the first and second end portions EP1 and EP2 of the stick-type LED LD may be exposed to the outside.

[0102] A first contact electrode CNE1 for stably electrically and / or physically coupling the first electrode EL1 with the first end portion EP1 of the rod-type LED LD may be disposed on the first electrode EL1.

[0103] The first contact electrode CNE1 may be made of, for example, a transparent conductive material such as ITO, IZO, or ITZO so that light emitted from the rod-type LED LD can pass through the first contact electrode CNE1 , but the present disclosure is not limited thereto.

[0104] When viewed on a plane, the first contact electrode CNE1 covers the first electrode EL1 and may overlap with the first electrode EL1. In addition, the first contact electrode CNE1 may partially overlap with the first end portion EP1 of the bar-type LED LD.

[0105] A second insulating layer INS2 covering the first contact electrode CNE1 may be disposed on the first contact electrode CNE1. The second insulating layer INS2 prevents the first contact electrode CNE1 from being exposed to the outside, thereby preventing (or reducing) corrosion of the first contact electrode CNE1. The second insulating layer INS2 may include any one of an inorganic insulating material and an organic insulating material.

[0106] A second contact electrode CNE2 for stably electrically and / or physically coupling the second electrode EL2 with the second end portion EP2 of the rod-type LED LD may be disposed on the second electrode EL2.

[0107] The second contact electrode CNE2 may be made of the same (eg, substantially the same) material as the first contact electrode CNE1, but the present disclosure is not limited thereto.

[0108] When viewed on a plane, the second contact electrode CNE2 covers the second electrode EL2 and may overlap with the second electrode EL2. In addition, the second contact electrode CNE2 may partially overlap with the second end portion EP2 of the bar-type LED LD.

[0109] A third insulating layer INS3 covering the second contact electrode CNE2 may be disposed on the second contact electrode CNE2.

[0110] The third insulating layer INS3 prevents the second contact electrode CNE2 from being exposed to the outside, thereby preventing (or reducing) corrosion of the second contact electrode CNE2. The third insulating layer INS3 may include any one of an inorganic insulating material and an organic insulating material.

[0111] An overcoat layer OC may be disposed on the third insulating layer INS3 .

[0112] The overcoat layer OC may be a planarization layer for reducing the step difference caused by the components disposed on the bottom thereof. In addition, the overcoat layer OC may be an encapsulation layer for preventing oxygen and moisture from penetrating into the rod-type LED LD (or for reducing the possibility or amount of oxygen and moisture penetrating into the rod-type LED LD).

[0113] As described above, the first end EP1 of the rod-type LED LD may be in contact with the first electrode EL1, and the second end EP2 of the rod-type LED LD may be in contact with the second electrode EL2. For example, the first semiconductor layer 11 of the rod-type LED LD may be in contact with the first electrode EL1, and the second semiconductor layer 13 of the rod-type LED LD may be in contact with the second electrode EL2.

[0114] Therefore, the first and second semiconductor layers 11 and 13 of the rod-type LED LD may be applied with (or supplied with) a set (eg, predetermined) voltage through the first and second electrodes EL1 and EL2 .

[0115] When an electric field of a set or predetermined voltage or more is applied to both end portions EP1 and EP2 of the rod-type LED LD, electron-hole pairs are combined in the active layer 12 so that each rod-type LED LD emits light (eg, each rod-type LED LD is configured to emit light).

[0116] Figure 4B As with Figure 3 The cross-sectional view corresponding to the line II' shows Figure 3 Another embodiment of the unit light emitting area of ​​the light emitting device. Figure 4B In order to avoid redundancy, the parts that are different from those of the above-described embodiment will be mainly described (for example, redundant descriptions of the same features will not be repeated). The parts of the device not particularly described in this embodiment follow the parts of the device of the above-described embodiment. In addition, the same reference numerals represent the same components, and similar reference numerals represent similar components.

[0117] In addition to providing a first partition wall PW1 between the substrate SUB and the first electrode EL1 and providing a second partition wall PW2 between the substrate SUB and the second electrode EL2, Figure 4B The light emitting device shown in FIG may have Figure 4A The configuration of the light emitting device shown in is the same as or a similar configuration.

[0118] Reference Figure 3 and Figure 4B The light emitting apparatus according to an embodiment of the present disclosure may include a substrate SUB, first and second partition walls PW1 and PW2, first and second electrodes EL1 and EL2, a rod-type LED LD, and first and second contact electrodes CNE1 and CNE2.

[0119] The first partition wall PW1 and the second partition wall PW2 may be provided on the substrate SUB to be spaced apart from each other. In an embodiment of the present disclosure, the first partition wall PW1 and the second partition wall PW2 may be provided on the substrate SUB to be spaced apart from each other by a length longer than that of the bar type LED LD.

[0120] The first partition wall PW1 and the second partition wall PW2 may be made of an insulating material including an inorganic material or an organic material, but the present disclosure is not limited thereto. The first partition wall PW1 and the second partition wall PW2 may have a trapezoidal shape whose side surfaces have a slope of a set or predetermined angle, but the present disclosure is not limited thereto.

[0121] The first electrode EL1 may be disposed on the first partition wall PW1 , and the second electrode EL2 may be disposed on the second partition wall PW2 .

[0122] The first electrode EL1 and the second electrode EL2 may be provided to correspond to the shapes of the first partition wall PW1 and the second partition wall PW2, respectively. Therefore, the first electrode EL1 may have a slope corresponding to the slope of the first partition wall PW1, and the second electrode EL2 may have a slope corresponding to the slope of the second partition wall PW2.

[0123] In an embodiment of the present disclosure, the first electrode EL1 and the second electrode EL2 may be made of a conductive material having a constant (e.g., substantially constant) reflectivity. The first electrode EL1 and the second electrode EL2 may be configured so that light emitted from both ends EP1 and EP2 of the rod-type LED LD advances in a direction (e.g., a front direction) in which an image is displayed.

[0124] For example, since the first and second electrodes EL1 and EL2 have shapes corresponding to the shapes of the first and second partition walls PW1 and PW2, respectively, light emitted from both ends EP1 and EP2 of the rod-type LED LD is reflected by the first and second electrodes EL1 and EL2 to further travel in the front direction. Therefore, the efficiency of light emitted from the rod-type LED LD can be improved.

[0125] In an embodiment of the present disclosure, the first and second partition walls PW1 and PW2 may function as reflective members for improving the efficiency of light emitted from the rod-type LED LD together with the first and second electrodes EL1 and EL2 .

[0126] Figure 5 As the Figure 1 A schematic plan view of a display device in which a rod-type LED LD shown in FIG. 1 is used as a light emitting source illustrates a display device according to an embodiment of the present disclosure.

[0127] Reference Figure 1 and Figure 5 , a display device according to the present disclosure may include a substrate SUB, pixels PXL disposed on the substrate SUB, a driving unit disposed on the substrate SUB and driving the pixels PXL, and a line unit coupling the pixels PXL and the driving unit.

[0128] The substrate SUB may include a display area DA and a non-display area NDA.

[0129] The display area DA may be an area in which pixels PXL for displaying an image are disposed, and the non-display area NDA may be an area in which a driving unit for driving the pixels PXL and a portion of a line unit coupling the pixels PXL and the driving unit are disposed.

[0130] The display area DA may have various suitable shapes. For example, the display area DA may be configured into various suitable shapes, such as a closed polygon including straight edges, a circle including curved edges, an ellipse, etc., and a semicircle including straight edges and curved edges, a semiellipse, etc.

[0131] When the display area DA includes a plurality of regions, each region may also be configured in various shapes, such as a closed polygon including straight edges, a circle including curved edges, an ellipse, etc., and a semicircle including straight edges and curved edges, a semiellipse, etc. In addition, the areas of the plurality of regions may be the same as or different from each other.

[0132] In the embodiment of the present disclosure, a case where the display area DA is provided as one area having a quadrangular shape including straight line sides is described as an example.

[0133] The non-display area NDA may be provided at at least one side of the display area DA. In an embodiment of the present disclosure, the non-display area NDA may surround the circumference of the display area DA.

[0134] The pixels PXL may be provided in the display area DA on the substrate SUB. Each of the pixels PXL is a minimum unit for displaying an image and may be provided in plurality.

[0135] Each pixel PXL may be configured to emit light of any color among red, green, and blue, but the present disclosure is not limited thereto. For example, the pixel PXL may be configured to emit light of any color among cyan, magenta, yellow, and white.

[0136] The pixels PXL may be provided in a plurality in a matrix form along rows extending in a first direction DR1 and columns extending in a second direction DR2 crossing the first direction DR1. However, the arrangement form of the pixels PXL is not particularly limited, and the pixels PXL may be arranged in various suitable forms.

[0137] The driving unit provides a signal to each pixel PXL through the line unit, and accordingly, the driving of the pixel PXL can be controlled. Figure 5 In the figure, line units are omitted for convenience of description.

[0138] The driving unit may include a scan driver SDV for supplying scan signals to the pixels PXL via scan lines, an emission driver EDV for supplying emission control signals to the pixels PXL via emission control lines, a data driver DDV for supplying data signals to the pixels PXL via data lines, and a timing controller. The timing controller may control the scan driver SDV, the emission driver EDV, and the data driver DDV.

[0139] Figure 6 It is schematically shown Figure 5 1 is a plan view of first to third sub-pixels SP1 to SP3 included in one pixel PXL among the pixels PXL shown in FIG. Figure 7 It is along Figure 6 A cross-sectional view taken along line II-II'. Figure 8Ais a graph showing the absorption coefficients of red and green quantum dots relative to the wavelength of incident light, and Figure 8B is a graph showing the change in light emission efficiency of red quantum dots and green quantum dots with respect to the change in wavelength of incident light. Figure 8A In the figure, the dotted line marked with "R-QD" represents the absorption coefficient curve of the red quantum dots relative to the change of the wavelength of the incident light, and the solid line marked with "G-QD" represents the absorption coefficient curve of the green quantum dots relative to the change of the wavelength of the incident light. Figure 8B In the figure, the curve marked with "red" text and solid triangles represents the light emission efficiency curve of red quantum dots with respect to the change of incident light wavelength, and the curve marked with "green" text and hollow squares represents the light emission efficiency curve of green quantum dots with respect to the change of incident light wavelength.

[0140] For the convenience of description, Figure 6 It is shown that the plurality of stick-type LED LDs are arranged in the horizontal direction, but the arrangement of the stick-type LED LDs is not limited thereto.

[0141] In addition, Figure 6 , for convenience of description, illustration of transistors connected to the rod-type LED LD and signal lines connected to the transistors is omitted.

[0142] In the embodiments of the present disclosure, in order to avoid redundancy, the parts that are different from the parts of the above-described embodiments will be mainly described (for example, redundant descriptions of features will not be repeated here). The parts of the devices not particularly described in this embodiment follow the parts of the devices of the above-described embodiments. In addition, the same reference numerals represent the same components, and similar reference numerals represent similar components. Figure 6 In the embodiment, the unit light emitting region may be a pixel region including one pixel PXL including first to third sub-pixels SP1 to SP3.

[0143] Reference Figures 1 to 7 as well as Figures 8A to 8B The display device according to the embodiment of the present disclosure may include a substrate SUB on which a plurality of pixels PXL are provided. One pixel PXL may include a first sub-pixel SP1, a second sub-pixel SP2, and a third sub-pixel SP3 provided on the substrate SUB.

[0144] The first sub-pixel SP1 , the second sub-pixel SP2 , and the third sub-pixel SP3 may be pixel regions for displaying an image in one pixel PXL, and may be light-emitting regions configured to emit light.

[0145] Each of the first sub-pixel SP1 , the second sub-pixel SP2 , and the third sub-pixel SP3 may include a substrate SUB, a pixel circuit unit PCL, and a display element layer DPL.

[0146] The substrate SUB may include an insulating material such as glass, an organic polymer, or quartz. The substrate SUB may be made of a flexible material so as to be bendable or foldable. The substrate SUB may have a single-layer or multi-layer structure.

[0147] The pixel circuit unit PCL may include a buffer layer BFL disposed on a substrate SUB, a transistor T disposed on the buffer layer BFL, and a driving voltage line DVL.

[0148] The buffer layer BFL may prevent impurities from diffusing into the transistor T (or may reduce the possibility or amount of such diffusion). The buffer layer BFL may be provided as a single layer, or may be provided as a multilayer including at least two layers.

[0149] When the buffer layer BFL is provided in a multi-layer form, the layers may be formed of the same material or may be formed of different materials. Depending on the material of the substrate SUB and process conditions, the buffer layer BFL may be omitted.

[0150] The transistor T may be electrically coupled to some of the plurality of bar-type LEDs LD included in the display element layer DPL to drive the bar-type LEDs LD. The transistor T may include a semiconductor layer SCL, a gate electrode GE, a source electrode SE, and a drain electrode DE.

[0151] The semiconductor layer SCL may be disposed on the buffer layer BFL. The semiconductor layer SCL may include a source region in contact with the source electrode SE and a drain region in contact with the drain electrode DE. A region between the source region and the drain region may be a channel region.

[0152] The semiconductor layer SCL may be a semiconductor pattern made of polysilicon, amorphous silicon, oxide semiconductor, etc. The channel region is a semiconductor pattern not doped with impurities and may be an intrinsic semiconductor. The source region and the drain region are semiconductor patterns doped with impurities.

[0153] The gate electrode GE may be disposed on the semiconductor layer SCL with the gate insulating layer GI interposed therebetween.

[0154] The source electrode SE and the drain electrode DE may respectively contact the source region and the drain region of the semiconductor layer SCL through contact holes penetrating the interlayer insulating layer ILD and the gate insulating layer GI.

[0155] A protection layer PSV may be provided above the transistor T.

[0156] In some embodiments, the driving voltage line DVL is disposed on the interlayer insulating layer ILD and may extend along the second direction DR2 when viewed on a plane. The driving voltage line DVL may be electrically coupled to the display element layer DPL via a contact hole penetrating the protection layer PSV.

[0157] The display element layer DPL may include a stick-type LED LD disposed on the protection layer PSV.

[0158] In an embodiment of the present disclosure, the stick-type LED LD may include a first stick-type LED LD1 and a second stick-type LED LD2. The first stick-type LED LD1 may be disposed in the first and second subpixels SP1 and SP2, and the second stick-type LED LD2 may be disposed in the third subpixel SP3.

[0159] Each of the first and second rod-type LEDs LD1 and LD2 may include a first semiconductor layer 11 , a second semiconductor layer 13 , and an active layer 12 interposed between the first and second semiconductor layers 11 and 13 .

[0160] In addition, each of the first and second rod-type LEDs LD1 and LD2 may include a first end portion EP1 and a second end portion EP2 along the first direction DR1. One of the first and second semiconductor layers 11 and 13 may be disposed at the first end portion EP1, and the other of the first and second semiconductor layers 11 and 13 may be disposed at the second end portion EP2.

[0161] In an embodiment of the present disclosure, the first stick-type LED LD1 may be configured to emit a first color light, and the second stick-type LED LD2 may be configured to emit a second color light.

[0162] The first color light and the second color light may include blue-based light having different wavelengths. For example, the first color light may be blue light having a shorter wavelength than the second color light. In an embodiment of the present disclosure, the first color light may be blue-based light having a wavelength of approximately 405 nm, and the second color light may be blue-based light having a wavelength of approximately 450 nm.

[0163] Hereinafter, for convenience of description, the first color light is referred to as first blue light, and the second color light is referred to as second blue light.

[0164] The first stick type LED LD1 configured to emit first blue light having a wavelength shorter than that of the second blue light can be formed by adjusting the content (eg, amount) of In in a semiconductor material constituting the active layer 12 of the second stick type LED LD2 in a process of manufacturing the second stick type LED LD2.

[0165] In some embodiments, the second stick-type LED LD2 configured to emit second blue light having a wavelength longer than that of the first blue light can be formed by adjusting the content (e.g., amount) of In in the semiconductor material constituting the active layer 12 of the first stick-type LED LD1 in a process of manufacturing the first stick-type LED LD1.

[0166] The display element layer DPL may further include a pixel defining layer PDL, first and second electrodes EL1 and EL2 , first and second contact electrodes CNE1 and CNE2 , and first and second connection lines CNL1 and CNL2 .

[0167] The pixel defining layer (PDL) is disposed on the protective layer (PSV) and may define a light emitting region in each of the first, second, and third sub-pixels (SP1, SP2, and SP3). The pixel defining layer (PDL) may include an opening that exposes the bar-type LED LD included in each of the first, second, and third sub-pixels (SP1, SP2, and SP3).

[0168] Two adjacent pixel defining layers (PDL) on a substrate (SUB) may be spaced apart by a predetermined or certain distance. For example, two adjacent pixel defining layers (PDL) may be spaced apart by a length greater than the length of the rod-type LEDs (LD) on the substrate (SUB). The pixel defining layers (PDL) may be made of an insulating material including an inorganic material or an organic material, but the present disclosure is not limited thereto.

[0169] In an embodiment of the present disclosure, the pixel defining layer (PDL) may be made of an insulating material including an organic material. For example, the pixel defining layer (PDL) may include at least one selected from polystyrene, polymethyl methacrylate (PMMA), polyacrylonitrile (PAN), polyamide (PA), polyimide (PI), polyarylene ether (PAE), heterocyclic polymer, parylene, epoxy resin, benzocyclobutene (BCB), siloxane-based resin, and silane-based resin.

[0170] A first insulating layer INS1 may be provided on a substrate SUB including a pixel defining layer PDL. The first insulating layer INS1 may cover a portion of the upper surface of each of the bar-type LEDs LD provided in each of the first, second, and third sub-pixels SP1, SP2, and SP3. The first and second end portions EP1, EP2 of each bar-type LED LD may be exposed to the outside by the first insulating layer INS1.

[0171] The first electrode EL1 may be disposed on the protective layer PSV. The first electrode EL1 is disposed adjacent to one of the first end portion EP1 and the second end portion EP2 of the corresponding stick-type LED LD and may be electrically coupled to the corresponding stick-type LED LD through the first contact electrode CNE1.

[0172] The first electrode EL1 may be electrically coupled to the driving voltage line DVL through a contact hole.

[0173] The first electrode EL1 may be provided as a portion of the first connection line CNL1 or may be provided in a shape protruding from the first connection line CNL1. The first connection line CNL1 may be a line for applying a voltage to the first electrode EL1 when aligning the corresponding stick-type LED LD.

[0174] The second electrode EL2 is disposed adjacent to one of the first end portion EP1 and the second end portion EP2 of the corresponding rod-type LED LD and may be electrically coupled to the corresponding rod-type LED LD via a second contact electrode CNE2. The second electrode EL2 included in each of the first subpixel SP1, the second subpixel SP2, and the third subpixel SP3 may be electrically coupled to a second connection line CNL2.

[0175] The second electrode EL2 is electrically coupled to the drain electrode DE of the transistor T through a contact hole CH penetrating the protection layer PSV to be supplied with a signal through the transistor T.

[0176] The second electrode EL2 may be provided as a portion of the second connection line CNL2 or may be provided in a shape protruding from the second connection line CNL2. The second connection line CNL2 may be a line for applying a voltage to the second electrode EL2 when aligning the corresponding bar-type LED LD.

[0177] In an embodiment of the present disclosure, the first electrode EL1 and the first connection line CNL1 may be integrally provided, and the second electrode EL2 and the second connection line CNL2 may be integrally provided.

[0178] The first and second electrodes EL1 and EL2 may include the same (eg, substantially the same) material. For example, the first and second electrodes EL1 and EL2 may include a conductive material.

[0179] The conductive material may include: metals such as Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr or any alloys thereof; conductive oxides such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO) or indium tin zinc oxide (ITZO); conductive polymers such as PEDOT, etc.

[0180] In addition, the first electrode EL1, the second electrode EL2, the first connection line CNL1, and the second connection line CNL2 may be formed as a single layer. However, the present disclosure is not limited thereto, and the first electrode EL1, the second electrode EL2, the first connection line CNL1, and the second connection line CNL2 may be formed as a multilayer in which two or more materials among metals, alloys, conductive oxides, and conductive polymers are stacked.

[0181] In some embodiments, the first partition wall ( Figure 4B PW1) may be provided between the protective layer PSV and the first electrode EL1, and the second partition wall ( Figure 4B The protective layer PW2) may be provided between the protective layer PSV and the second electrode EL2.

[0182] A first end portion EP1 of each of the first and second stick-type LEDs LD1 and LD2 may be disposed adjacent to the first electrode EL1 , and a second end portion EP2 of each of the first and second stick-type LEDs LD1 and LD2 may be disposed adjacent to one side of the second electrode EL2 .

[0183] A first contact electrode CNE1 for stably electrically and / or physically coupling the first electrode EL1 with the corresponding bar-type LED LD may be disposed on the first electrode EL1. The first contact electrode CNE1 may overlap the first electrode EL1 when viewed on a plane.

[0184] The first contact electrode CNE1 may be in ohmic contact with the first electrode EL1 .

[0185] The first end portion EP1 of each of the first and second stick-type LEDs LD1 and LD2 may be electrically coupled to the first electrode EL1 through the first contact electrode CNE1 .

[0186] Therefore, a voltage applied to the driving voltage line DVL may be applied to the first end portion EP1 of each of the first and second stick type LEDs LD1 and LD2 through the first electrode EL1 and the first contact electrode CNE1 .

[0187] The second insulating layer INS2 may be disposed on the substrate SUB including the first contact electrode CNE1. The second insulating layer INS2 may be an inorganic insulating layer including an inorganic material or an organic insulating layer including an organic material.

[0188] A second contact electrode CNE2 that stably electrically and / or physically couples the second electrode EL2 with the corresponding bar-type LED LD may be disposed on the second electrode EL2. The second contact electrode CNE2 may overlap the second electrode EL2 when viewed on a plane.

[0189] The second contact electrode CNE2 may be in ohmic contact with the second electrode EL2 .

[0190] The second end portion EP2 of each of the first and second stick-type LEDs LD1 and LD2 may be electrically coupled to the second electrode EL2 through the second contact electrode CNE2 .

[0191] Therefore, when a set or predetermined voltage is applied to both end portions EP1 and EP2 of the first stick type LED LD1 through the first and second electrodes EL1 and EL2 , the first stick type LED LD1 may be configured to emit the first blue light.

[0192] Furthermore, when a set or predetermined voltage is applied to both end portions EP1 and EP2 of the second stick type LED LD2 through the first and second electrodes EL1 and EL2 , the second stick type LED LD2 may be configured to emit a second blue light.

[0193] The third insulating layer INS3 may be disposed on the substrate SUB on which the second contact electrode CNE2 is disposed. The third insulating layer INS3 may cover the second contact electrode CNE2, wherein the second contact electrode CNE2 is disposed on the bottom of the third insulating layer INS3 so as not to be exposed to the outside.

[0194] On the other hand, the display device may further include a color conversion layer CCL.

[0195] The color conversion layer CCL may be configured to convert the first blue light and the second blue light respectively emitted from the first and second stick-type LEDs LD1 and LD2 into light of a set (or specific) color for each sub-pixel SP.

[0196] In an embodiment of the present disclosure, the color conversion layer CCL may include first, second, and third color conversion patterns CCP1, CCP2, and CCP3. The first, second, and third color conversion patterns CCP1, CCP2, and CCP3 may correspond to corresponding sub-pixels SP, respectively.

[0197] For example, the first color conversion pattern CCP1 may correspond to the first sub-pixel SP1 , the second color conversion pattern CCP2 may correspond to the second sub-pixel SP2 , and the third color conversion pattern CCP3 may correspond to the third sub-pixel SP3 .

[0198] The first color conversion pattern CCP1 may be configured to convert the first blue light emitted from the first rod-type LED LD1 of the first subpixel SP1 into red light. The first color conversion pattern CCP1 may be configured to emit red light having a wavelength of about 620 nm to 780 nm by absorbing the first blue light and changing the wavelength of the first blue light through energy level transition.

[0199] The first color conversion pattern CCP1 may include first quantum dots. For example, the first color conversion pattern CCP1 may include first quantum dots dispersed in a transparent resin. The first quantum dots may be red quantum dots.

[0200] In the embodiment of the present disclosure, the first color conversion pattern CCP1 is shown as being disposed on the top of the first stick-type LED LD1 of the first subpixel SP1, but the present disclosure is not limited thereto. For example, the first color conversion pattern CCP1 may be disposed on a side surface or a bottom of the first stick-type LED LD1 of the first subpixel SP1.

[0201] The second color conversion pattern CCP2 may be configured to convert the first blue light emitted from the first rod-type LED LD1 of the second subpixel SP2 into green light. The second color conversion pattern CCP2 may be configured to emit green light having a wavelength of about 500 nm to 570 nm by absorbing the first blue light and changing the wavelength of the first blue light through energy level transition.

[0202] The second color conversion pattern CCP2 may include second quantum dots. For example, the second color conversion pattern CCP2 may include second quantum dots dispersed in a transparent resin. The second quantum dots may be green quantum dots.

[0203] In the embodiment of the present disclosure, the second color conversion pattern CCP2 is shown as being disposed on the top of the first stick-type LED LD1 of the second sub-pixel SP2, but the present disclosure is not limited thereto. For example, the second color conversion pattern CCP2 may be disposed on the side surface or bottom of the first stick-type LED LD1 of the second sub-pixel SP2.

[0204] Each of the first quantum dot and the second quantum dot may be selected from a group consisting of a II-IV compound, a III-V cluster compound, a IV-VI compound, a Group IV element, a Group IV compound, and combinations thereof.

[0205] The II-VI compound may be selected from the group consisting of: a binary compound selected from the group consisting of CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, MgSe, MgS, and combinations thereof; a binary compound selected from the group consisting of CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdS a ternary compound selected from the group consisting of HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, HgZnSTe, and a combination thereof; and a quaternary compound selected from the group consisting of HgZnTeS, CdZnSeS, CdZnSeTe, CdZnSTe, HgZnSeS, HgZnSeTe, HgZnSTe, and a combination thereof.

[0206] The III-V compounds may be selected from the group consisting of: binary compounds selected from the group consisting of GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb and combinations thereof; ternary compounds selected from the group consisting of GaNPs, GaNAs, GaNSb, GaPAs, GaPSb, AlNPs, AlNAs, AlNSb, AlPAs, AlPSb, InNPs, InNAs, InNSb, InPAs, InPSb and combinations thereof; and quaternary compounds selected from the group consisting of GaAlNPs, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNPs, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNPs, InAlNAs, InAlNSb, InAlPAs, InAlPSb and combinations thereof.

[0207] The IV-VI group compound can be selected from the following groups: binary compounds selected from the group consisting of SnS, SnSe, SnTe, PbS, PbSe, PbTe and their combinations; ternary compounds selected from the group consisting of SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe and their combinations; and quaternary compounds selected from the group consisting of SnPbSSe, SnPbSeTe, SnPbSTe and their combinations.

[0208] The Group IV element may be selected from the group consisting of Si, Ge, and combinations thereof. The Group IV compound may be a binary compound selected from the group consisting of SiC, SiGe, and combinations thereof.

[0209] The first and second quantum dots may have a full width at half maximum (FWHM) of about 45 nm or less. Light emitted by the first and second quantum dots is emitted in all directions, and thus a wide viewing angle may be achieved.

[0210] The shapes of the first and second quantum dots can be any shapes commonly available in the technical field and are not particularly limited. For example, the first and second quantum dots can have spherical, pyramidal, or multi-arm shapes, or can have cubic nanoparticles, nanotubes, nanowires, nanofibers, nanosheet particles, etc.

[0211] Usually, such as Figure 8A As shown in , red quantum dots and green quantum dots have a characteristic that their absorption coefficients decrease as the wavelength of incident light increases. For example, the absorption coefficients of red quantum dots and green quantum dots decrease significantly when light with a wavelength of 450 nm or greater is incident.

[0212] Therefore, when light having a wavelength of 450 nm or more is incident into the red quantum dots and the green quantum dots, the efficiency of light emitted from the red quantum dots and the green quantum dots is ultimately lowered or reduced.

[0213] In an embodiment of the present disclosure, the first color conversion pattern CCP1 including red quantum dots corresponds to the first sub-pixel SP1 , and the second color conversion pattern CCP2 including green quantum dots corresponds to the second sub-pixel SP2 .

[0214] As described above, the first stick type LED LD1 configured to emit the first blue light having a wavelength of about 405 nm may be disposed in each of the first sub-pixel SP1 and the second sub-pixel SP2 .

[0215] Therefore, when the first blue light having a wavelength of 405 nm is incident into the red quantum dots, the efficiency of light finally emitted from the first subpixel SP1 may be increased due to an increase in the absorption coefficient of the red quantum dots.

[0216] Similarly, when the first blue light having a wavelength of 405 nm is incident on the green quantum dot, the efficiency of light finally emitted from the second subpixel SP2 may increase due to an increase in the absorption coefficient of the green quantum dot.

[0217] In the following, reference will be made to Figure 8B Describe the change in light emission efficiency of red and green quantum dots with respect to the wavelength of the incident light.

[0218] exist Figure 8B , the numbers indicated on the X-axis of the graph represent the wavelength (nm) of light incident into the red quantum dots and the green quantum dots, and the numbers indicated on the Y-axis of the graph represent the light emission efficiency (%) in each of the red quantum dots and the green quantum dots.

[0219] exist Figure 8B In the figure, the light emission data of the red quantum dots and the green quantum dots represent values ​​obtained by disposing a plurality of rod-type LED LDs configured to emit light having a wavelength of 405 nm to 455 nm on a substrate, disposing red quantum dots and green quantum dots on top of the plurality of rod-type LED LDs, and then measuring the light emitted from the red quantum dots and the green quantum dots using a detector. Figure 8B The numerical values ​​obtained from the data shown in the graph are shown in Table 1 below.

[0220] Table 1

[0221]

[0222] As shown in Table 1 and Figure 8BAs can be seen in FIG, when the wavelength of light incident into the red quantum dot and the green quantum dot is about 405 nm, the efficiency of light emitted from each of the red quantum dot and the green quantum dot is measured to be 100%.

[0223] When the wavelength of light incident on the red quantum dots was about 455 nm, the efficiency of light emitted from the red quantum dots was measured to be 83%, and when the wavelength of light incident on the green quantum dots was about 455 nm, the efficiency of light emitted from the green quantum dots was measured to be 53%.

[0224] From this result, it can be seen that the light emission efficiency (%) increases as the wavelength of light incident on each of the red quantum dots and the green quantum dots decreases. For example, it can be seen that the efficiency (%) of light emitted from each of the red quantum dots and the green quantum dots when the wavelength of light incident on each of the red quantum dots and the green quantum dots is approximately 405 nm is higher than the efficiency (%) of light emitted from each of the red quantum dots and the green quantum dots when the wavelength of light incident on each of the red quantum dots and the green quantum dots is approximately 450 nm.

[0225] Therefore, the first color conversion pattern CCP1 and the first stick type LED LD1 are disposed in the first subpixel SP1, and the second color conversion pattern CCP2 and the first stick type LED LD1 are disposed in the second subpixel SP2, so that efficiency of light emitted from each of the first and second subpixels SP1 and SP2 can be improved.

[0226] Therefore, the brightness of the display device according to the embodiment of the present disclosure may be increased, and the display quality of an image finally displayed in the display device may be improved.

[0227] In addition, the display device according to an embodiment of the present disclosure emits light with excellent color reproducibility (e.g., is configured to emit light with excellent color reproducibility) through the color conversion layer CCL including red quantum dots and green quantum dots, thereby improving light emission efficiency.

[0228] The third color conversion pattern CCP3 may be configured to allow the second blue light emitted from the second rod-type LED LD2 to pass through the third color conversion pattern CCP3. To this end, the third color conversion pattern CCP3 may include a transparent layer.

[0229] The transparent layer may be made of a transparent polymer, and the second blue light emitted from the second rod-type LED LD2 passes through the transparent layer to be emitted as it is.

[0230] The third color conversion pattern CCP3 including the transparent layer may be configured to allow the second blue light incident therein to be emitted as it is without any quantum dots, and thus, the intensity of light emitted from the third sub-pixel SP3 may be increased.

[0231] In some embodiments, the third color conversion pattern CCP3 may include a blue color filter instead of the transparent layer.

[0232] The color conversion layer CCL may further include a light-blocking pattern BLP disposed between the first, second, and third color conversion patterns CCP1, CCP2, and CCP3.

[0233] The light-blocking pattern BLP is disposed between the first, second, and third color conversion patterns CCP1, CCP2, and CCP3 to prevent (or reduce) mixing of colors of the first, second, and third color conversion patterns CCP1, CCP2, and CCP3.

[0234] In addition, the light blocking pattern BLP is set in the non-luminous area of ​​the corresponding sub-pixel SP except the luminous area, and prevents the transistor T, the driving voltage line DVL, etc. set in the non-luminous area from being seen from the outside (or reduces the visibility of the transistor T, the driving voltage line DVL, etc. from the outside).

[0235] The light-blocking pattern BLP may include a black matrix. However, the present disclosure is not limited thereto, and the light-blocking pattern BLP may be made of a material including a material for blocking light.

[0236] An overcoat layer (OC) may be provided on the color conversion layer (CCL). The overcoat layer (OC) may be a planarization layer for reducing step differences caused by components provided on its bottom. Alternatively, the overcoat layer (OC) may be an encapsulation layer for preventing oxygen and moisture from penetrating into the first and second rod-type LEDs (LD1 and LD2) (or for reducing the likelihood or amount of oxygen and moisture penetrating into the first and second rod-type LEDs (LD1 and LD2)).

[0237] Figures 9 to 15 It is shown sequentially Figure 7 sectional views of a manufacturing method of the first to third sub-pixels SP1 to SP3 shown in FIG.

[0238] Reference Figure 7 and Figure 9 , a transistor T and a protection layer PSV covering the transistor T are formed on a substrate SUB including the first sub-pixel SP1 , the second sub-pixel SP2 , and the third sub-pixel SP3 .

[0239] The transistor T may include a semiconductor layer SCL, a gate electrode GE, and a source electrode SE and a drain electrode DE, wherein the semiconductor layer SCL is disposed on a buffer layer BFL of a substrate SUB, the gate electrode GE is disposed on the semiconductor layer SCL with a gate insulating layer GI interposed therebetween, and the source electrode SE and the drain electrode DE are each coupled to the semiconductor layer SCL.

[0240] Reference Figure 7 and Figure 10 , a pixel defining layer PDL is formed on the protective layer PSV. In addition, a first electrode EL1 and a second electrode EL2 are formed on the protective layer PSV.

[0241] The first electrode EL1 and the second electrode EL2 are disposed on the same plane (eg, one surface of the protection layer PSV) and may be spaced apart from each other by a set or certain distance.

[0242] The second electrode EL2 may be electrically coupled to the drain electrode DE of the transistor T through a contact hole CH penetrating the protection layer PSV.

[0243] Reference Figure 7 and Figure 11 In a state where an electric field is applied between the first electrode EL1 and the second electrode EL2 provided in each of the first sub-pixel SP1 and the second sub-pixel SP2, the first rod-type LED LD1 is dispersed on the substrate SUB. In an embodiment of the present disclosure, the first rod-type LED LD1 is configured to emit a first blue light having a wavelength of 405 nm.

[0244] As a non-limiting example of a technique for dispersing the first stick-type LEDs LD1 between the first and second electrodes EL1 and EL2 in each of the first and second sub-pixels SP1 and SP2, an inkjet printing technique may be used. However, the present disclosure is not limited thereto.

[0245] When the first stick type LEDs LD1 are dispersed, the first stick type LEDs LD1 may be self-aligned in the first and second subpixels SP1 and SP2 due to an electric field formed between the first and second electrodes EL1 and EL2 provided in the first and second subpixels SP1 and SP2.

[0246] For example, when power is applied to the first and second electrodes EL1 and EL2 provided in each of the first and second subpixels SP1 and SP2, the first stick type LED LD1 may be self-aligned between the first and second electrodes EL1 and EL2 by an electric field formed therebetween.

[0247] Reference Figure 7 and Figure 12In a state where an electric field is applied between the first electrode EL1 and the second electrode EL2 disposed in the third subpixel SP3, the second rod-type LED LD2 is dispersed on the substrate SUB. In an embodiment of the present disclosure, the second rod-type LED LD2 is configured to emit a second blue light having a wavelength of approximately 450 nm or greater.

[0248] As a non-limiting example of a technique for dispersing the second rod-type LEDs LD2 between the first and second electrodes EL1 and EL2 in the third sub-pixel SP3 , an inkjet printing technique may be used, but the present disclosure is not limited thereto.

[0249] When the second rod type LEDs LD2 are dispersed, the second rod type LEDs LD2 may be self-aligned in the third sub-pixel SP3 due to an electric field formed between the first and second electrodes EL1 and EL2 provided in the third sub-pixel SP3.

[0250] Typically, in existing display devices, a bar-type LED configured to emit red light is aligned in a first subpixel SP1, a bar-type LED configured to emit green light is aligned in a second subpixel SP2, and a bar-type LED configured to emit blue light is then aligned in a third subpixel SP3.

[0251] As described above, in the embodiment of the present disclosure, the first rod type LED LD1 configured to emit the first blue light is aligned in the first and second subpixels SP1 and SP2, and the second rod type LED LD2 configured to emit the second blue light is then aligned in the third subpixel SP3.

[0252] Therefore, in the display device according to the embodiment of the present disclosure, the number of processes for aligning the stick-type LEDs LD can be reduced compared to a conventional display device in which stick-type LEDs configured to emit light of different colors are aligned in the first to third sub-pixels SP1 to SP3. Therefore, in the display device according to the embodiment of the present disclosure, the manufacturing process of the display device can be simplified.

[0253] Reference Figure 7 and Figure 13 , an insulating material layer is applied to the entire (e.g., substantially the entire) surface of the substrate SUB on which the first and second stick-type LEDs LD1 and LD2 are aligned, and then a first insulating layer INS1 exposing the first end portion EP1 and the second end portion EP2 of each of the first and second stick-type LEDs LD1 and LD2 is formed through a mask process.

[0254] Next, a first contact electrode CNE1 is formed on the substrate SUB including the first insulating layer INS1.

[0255] The first contact electrode CNE1 provided in each of the first and second sub-pixels SP1 and SP2 covers the first end portion EP1 of the first stick-type LED LD1 and the first electrode EL1 and electrically couples the first end portion EP1 of the first stick-type LED LD1 and the first electrode EL1 .

[0256] The first contact electrode CNE1 of each of the first and second sub-pixels SP1 and SP2 may electrically and / or physically couple the first electrode EL1 and the first end portion EP1 of the first stick-type LED LD1 .

[0257] The interface between the first end portion EP1 of the first rod-type LED LD1 and the first contact electrode CNE1 may be heat-treated, so that the first contact electrode CNE1 and the first end portion EP1 of the first rod-type LED LD1 may be in ohmic contact with each other.

[0258] The first contact electrode CNE1 disposed in the third sub-pixel SP3 covers the first end portion EP1 of the second rod-type LED LD2 and the first electrode EL1 and may electrically couple the first end portion EP1 of the second rod-type LED LD2 and the first electrode EL1 .

[0259] The first contact electrode CNE1 of the third sub-pixel SP3 may electrically and / or physically couple the first electrode EL1 and the first end portion EP1 of the second rod-type LED LD2 .

[0260] The interface between the first end portion EP1 of the second rod-type LED LD2 and the first contact electrode CNE1 may be heat-treated, so that the first end portion EP1 of the second rod-type LED LD2 and the first contact electrode CNE1 may be in ohmic contact with each other.

[0261] Reference Figure 7 and Figure 14 , an insulating material layer is applied to the entire (e.g., substantially the entire) surface of the substrate SUB including the first contact electrode CNE1, and then a second insulating layer INS2 exposing the second electrode EL2 and the second end portion EP2 of each of the first and second stick-type LEDs LD1 and LD2 is formed through a mask process.

[0262] Next, a second contact electrode CNE2 is formed on the substrate SUB including the second insulating layer INS2.

[0263] The second contact electrode CNE2 disposed in each of the first and second sub-pixels SP1 and SP2 covers the second end portion EP2 of the first stick type LED LD1 and the second electrode EL2 and may electrically couple the first stick type LED LD1 and the second electrode EL2.

[0264] The second contact electrode CNE2 provided in each of the first and second sub-pixels SP1 and SP2 may electrically and / or physically couple the second electrode EL2 and the second end portion EP2 of the first stick-type LED LD1 .

[0265] The interface between the second end portion EP2 of the first bar-type LED LD1 and the second contact electrode CNE2 may be heat-treated, so that the second contact electrode CNE2 and the second end portion EP2 of the first bar-type LED LD1 may be in ohmic contact with each other.

[0266] The second contact electrode CNE2 disposed in the third sub-pixel SP3 covers the second end portion EP2 of the second rod-type LED LD2 and the second electrode EL2 and may electrically couple the second rod-type LED LD2 and the second electrode EL2.

[0267] The second contact electrode CNE2 disposed in the third sub-pixel SP3 may electrically and / or physically couple the second electrode EL2 and the second end portion EP2 of the second rod-type LED LD2.

[0268] The interface between the second end portion EP2 of the second rod-type LED LD2 and the second contact electrode CNE2 may be heat-treated, so that the second contact electrode CNE2 and the second end portion EP2 of the second rod-type LED LD2 may be in ohmic contact with each other.

[0269] Reference Figure 7 and Figure 15 A third insulating layer INS3 is formed on the substrate SUB including the second contact electrode CNE2. The third insulating layer INS3 covers the second contact electrode CNE2 and prevents (or reduces) corrosion of the second contact electrode CNE2.

[0270] Next, a color conversion layer CCL is formed on the third insulating layer INS3 .

[0271] The color conversion layer CCL may include a first color conversion pattern CCP1 corresponding to the first sub-pixel SP1 , a second color conversion pattern CCP2 corresponding to the second sub-pixel SP2 , and a third color conversion pattern CCP3 corresponding to the third sub-pixel SP3 .

[0272] The first color conversion pattern CCP1 may include red quantum dots configured to convert the first blue light emitted from the first rod-type LED LD1 of the first sub-pixel SP1 into red light.

[0273] The second color conversion pattern CCP2 may include green quantum dots configured to convert the first blue light emitted from the first rod-type LED LD1 of the second sub-pixel SP2 into green light.

[0274] Next, an overcoat layer OC is formed on the color conversion layer CCL.

[0275] The overcoat layer (OC) covers the color conversion layer (CCL) and can flatten the step difference caused by the components disposed on the bottom thereof. Furthermore, the overcoat layer (OC) prevents external oxygen and moisture from penetrating into the first and second rod-type LEDs (LD1 and LD2) (or reduces the likelihood or amount of oxygen and moisture penetrating into the first and second rod-type LEDs (LD1 and LD2).

[0276] Figure 16 As with Figure 6 The cross-sectional view corresponding to line II-II' shows a display device according to another embodiment of the present disclosure. In another embodiment of the present disclosure, in order to avoid redundancy, the parts that are different from those of the above-mentioned embodiment will be mainly described (for example, redundant descriptions of features will not be repeated here). The parts of the device not particularly described in this embodiment follow the parts of the device of the above-mentioned embodiment. In addition, the same reference numerals represent the same components, and similar reference numerals represent similar components.

[0277] In addition to the anti-reflection layer ARL provided on the color conversion layer CCL, Figure 16 The display device shown in may have Figures 6 and 7 The configuration of the display device shown in is basically the same or a similar configuration.

[0278] Reference Figure 6 and Figure 16 , a display device according to another embodiment of the present disclosure may include a substrate SUB on which a first sub-pixel SP1 , a second sub-pixel SP2 , and a third sub-pixel SP3 are disposed.

[0279] Each of the first sub-pixel SP1 , the second sub-pixel SP2 , and the third sub-pixel SP3 may include a substrate SUB, a pixel circuit unit PCL, a display element layer DPL, and a color conversion layer CCL.

[0280] The pixel circuit unit PCL may include a buffer layer BFL disposed on a substrate SUB, a transistor T disposed on the buffer layer BFL, and a driving voltage line DVL.

[0281] The display element layer DPL may include a first stick type LED LD1 disposed in each of the first sub-pixel SP1 and the second stick type LED LD2 disposed in the third sub-pixel SP3 .

[0282] In an embodiment of the present disclosure, the first stick-type LED LD1 may be configured to emit a first blue light having a wavelength of about 405 nm, and the second stick-type LED LD2 may be configured to emit a second blue light having a wavelength of about 450 nm.

[0283] The color conversion layer CCL may include a first color conversion pattern CCP1 corresponding to the first sub-pixel SP1 , a second color conversion pattern CCP2 corresponding to the second sub-pixel SP2 , and a third color conversion pattern CCP3 corresponding to the third sub-pixel SP3 .

[0284] In an embodiment of the present disclosure, the first color conversion pattern CCP1 may include red quantum dots configured to convert the first blue light emitted from the first rod-type LED LD1 of the first sub-pixel SP1 into red light.

[0285] The second color conversion pattern CCP2 may include green quantum dots configured to convert the first blue light emitted from the first rod-type LED LD1 of the second sub-pixel SP2 into green light.

[0286] The third color conversion pattern CCP3 may include a transparent layer or a blue color filter configured to allow the second blue light emitted from the second rod-type LED LD2 to pass therethrough.

[0287] The color conversion layer CCL may further include a light-blocking pattern BLP disposed between the first, second, and third color conversion patterns CCP1, CCP2, and CCP3.

[0288] On the other hand, the display device may further include an anti-reflection layer ARL disposed on the color conversion layer CCL.

[0289] The anti-reflection layer ARL prevents (or reduces) reflection of light incident into the display device. To this end, the anti-reflection layer ARL may be implemented using at least one of a color filter layer and a polarizing film.

[0290] A case where the anti-reflection layer ARL is realized using a polarizing film will be described first.

[0291] A polarizing film has a polarization axis and can linearly polarize light in a direction perpendicular to the polarization axis. For example, the polarizing film can be configured so that light parallel to the polarization axis is absorbed into the polarizing film, and can also be configured so that light perpendicular to the polarization axis passes through the polarizing film. Therefore, when light passes through the polarizing film, it can be linearly polarized in a direction perpendicular to the polarization axis.

[0292] The polarizing film absorbs light parallel to a polarization axis among light introduced into the display device and then reflected and emitted from the display device, thereby making it possible to reduce external light reflectivity of the display device.

[0293] When the anti-reflection layer ARL is implemented using a color filter layer, the anti-reflection layer ARL may include color filters and a black matrix arranged between the color filters, wherein the color filters are configured to emit light of a set (or specific) color for each of the first sub-pixel SP1, the second sub-pixel SP2 and the third sub-pixel SP3.

[0294] The black matrix can prevent (or reduce) mixing of colors of adjacent color filters, and absorb light incident from the outside into the display device to prevent the light from being incident on the components disposed on the bottom of the anti-reflection layer ARL (or reduce the amount of light incident on the components disposed on the bottom of the anti-reflection layer ARL). In addition, although light incident from the outside is reflected by the components, a portion of the light can be absorbed by the black matrix.

[0295] The color filters may include a red filter, a green filter, and a blue filter. The red filter may correspond to the first subpixel SP1, the green filter may correspond to the second subpixel SP2, and the blue filter may correspond to the third subpixel SP3.

[0296] Each of the red, green, and blue color filters functions as a filter configured to allow only light having a predetermined wavelength to pass therethrough. Therefore, although light is incident from the outside into the display device, the light may be blocked by the color filters and not pass downward from the anti-reflection layer ARL.

[0297] An overcoat layer (OC) may be provided on the anti-reflection layer (ARL). The overcoat layer (OC) may be a planarization layer for reducing step differences caused by components provided on its bottom. Alternatively, the overcoat layer (OC) may be an encapsulation layer for preventing oxygen and moisture from penetrating into the first and second rod-type LEDs (LD1 and LD2) (or for reducing the likelihood or amount of oxygen and moisture penetrating into the first and second rod-type LEDs (LD1 and LD2)).

[0298] Figure 17 It shows Figure 5 1 is a plan view of another embodiment of first to third sub-pixels SP1 to SP3 included in one pixel PXL among the pixels PXL shown in FIG.

[0299] For the convenience of description, Figure 17 It is shown that the plurality of stick-type LED LDs are arranged in the horizontal direction, but the arrangement of the stick-type LED LDs is not limited thereto.

[0300] In addition, Figure 17 , for convenience of description, illustration of transistors connected to the rod-type LED LD and signal lines connected to the transistors is omitted.

[0301] In addition to the first and second rod-type LEDs LD1 and LD2 being mixed and disposed in each of the first to third sub-pixels SP1 to SP3, Figure 17 The display device shown in may have Figures 6 and 7 The configuration of the display device shown in is basically the same or a similar configuration.

[0302] Reference Figures 5 to 7 as well as Figure 17 The display device according to the embodiment of the present disclosure may include a plurality of pixels PXL provided on a substrate SUB. One pixel PXL may include a first sub-pixel SP1, a second sub-pixel SP2, and a third sub-pixel SP3.

[0303] The first subpixel SP1 , the second subpixel SP2 , and the third subpixel SP3 may be pixel regions configured to display an image in one pixel PXL, and may be light emitting regions configured to emit light.

[0304] Each of the first, second, and third subpixels SP1, SP2, and SP3 may include a first connection line CNL1 extending in a first direction DR1, a driving voltage line DVL extending in a second direction DR2 crossing the first direction DR1, and a second connection line CNL2 extending in the first direction DR1.

[0305] In addition, first and second electrodes EL1 and EL2, first and second contact electrodes CNE1 and CNE2, and first and second stick-type LEDs LD1 and LD2 may be provided in each of the first, second, and third subpixels SP1, SP2, and SP3.

[0306] Each of the first and second rod-type LEDs LD1 and LD2 may include a first semiconductor layer (see Figure 1 11), the second semiconductor layer (see Figure 1 13) and an active layer (see Figure 1 12).

[0307] In an embodiment of the present disclosure, the first rod-type LED LD1 may be configured to emit a first color light, and the second rod-type LED LD2 may be configured to emit a second color light. The first color light may be blue-based light having a wavelength of approximately 405 nm, and the second color light may be blue-based light having a wavelength of approximately 450 nm.

[0308] The first and second rod-type LEDs LD1 and LD2 may be mixed and disposed in each of the first, second, and third sub-pixels SP1, SP2, and SP3. For example, when viewed on a plane, the first and second rod-type LEDs LD1 and LD2 may be alternately disposed in the corresponding sub-pixels SP along the second direction DR2 of the substrate SUB, but the present disclosure is not limited thereto.

[0309] An inkjet printing technology may be used as a non-limiting example of a technology for dispersing the first and second stick-type LEDs LD1, LD2 into the first, second, and third sub-pixels SP1, SP2, and SP3.

[0310] In an example, the first and second rod-type LEDs LD1 and LD2 may be dispersed into the first, second, and third sub-pixels SP1, SP2, and SP3 by disposing a nozzle on the corresponding substrate SUB and then dropping a solution in which the first and second rod-type LEDs LD1 and LD2 are mixed onto the substrate SUB. The technique of dispersing the first and second rod-type LEDs LD1 and LD2 onto the substrate SUB is not limited thereto.

[0311] When the first and second rod-type LEDs LD1 and LD2 are dispersed, the first and second rod-type LEDs LD1 and LD2 may be self-aligned due to an electric field formed between the first and second electrodes EL1 and EL2 .

[0312] When power is applied to the first and second electrodes EL1 and EL2 , dipole properties of the first and second rod type LEDs LD1 and LD2 may be induced by an electric field formed between the first and second electrodes EL1 and EL2 for each sub-pixel SP.

[0313] Therefore, the first and second stick-type LEDs LD1 and LD2 may be self-aligned between the first and second electrodes EL1 and EL2 in the first, second, and third sub-pixels SP1, SP2, and SP3.

[0314] As described above, in the embodiment of the present disclosure, the first and second stick-type LEDs LD1 and LD2 may be aligned in parallel (eg, simultaneously) in each of the first, second, and third subpixels SP1, SP2, and SP3.

[0315] In the display device according to the embodiment of the present disclosure, a manufacturing process of the display device may be simplified compared to an existing display device in which stick-type LEDs configured to emit light of different colors are aligned in the first to third subpixels SP1 to SP3.

[0316] A color conversion layer CCL may be further disposed in the first sub-pixel SP1 , the second sub-pixel SP2 , and the third sub-pixel SP3 .

[0317] The color conversion layer CCL may include a first color conversion pattern CCP1 corresponding to the first subpixel SP1, a second color conversion pattern CCP2 corresponding to the second subpixel SP2, a third color conversion pattern CCP3 corresponding to the third subpixel SP3, and a light-blocking pattern BLP disposed between the first to third color conversion patterns CCP1 to CCP3.

[0318] The first color conversion pattern CCP1 may be configured to convert first and second color lights emitted from the first and second rod-type LEDs LD1 and LD2 of the first subpixel SP1, respectively, into red light. To this end, the first color conversion pattern CCP1 may include red quantum dots having a high absorption coefficient when light having a short wavelength is incident thereon.

[0319] The second color conversion pattern CCP2 may be configured to convert the first and second color lights emitted from the first and second rod-type LEDs LD1 and LD2 of the second subpixel SP2, respectively, into green light. To this end, the second color conversion pattern CCP2 may include green quantum dots having a high absorption coefficient when light having a short wavelength is incident thereon.

[0320] The third color conversion pattern CCP3 may include a transparent layer configured to allow the first color light and the second color light respectively emitted from the first and second rod type LEDs LD1 and LD2 of the third sub-pixel SP3 to pass therethrough.

[0321] Meanwhile, the threshold voltage of the first stick type LED LD1 and the threshold voltage of the second stick type LED LD2 may be different from each other. In an embodiment of the present disclosure, the threshold voltage of the first stick type LED LD1 may be set to be greater than the threshold voltage of the second stick type LED LD2.

[0322] Hereinafter, for convenience of description, the threshold voltage of the first stick type LED LD1 is referred to as a “first threshold voltage”, and the threshold voltage of the second stick type LED LD2 is referred to as a “second threshold voltage”.

[0323] When a set or predetermined voltage corresponding to a first threshold voltage or more is applied to both ends of each of the first and second rod-type LEDs LD1 and LD2 through the first and second electrodes EL1 and EL2 provided in each sub-pixel SP, both the first and second rod-type LEDs LD1 and LD2 may be driven to emit first and second blue lights.

[0324] In addition, when a set or predetermined voltage corresponding to the second threshold voltage or greater and the first threshold voltage or less is applied to both ends of each of the first rod-type LED LD1 and the second rod-type LED LD2 through the first electrode EL1 and the second electrode EL2 provided in each subpixel SP, only the second rod-type LED LD2 can be driven to emit the second blue light.

[0325] In the first subpixel SP1 , when a set or predetermined voltage corresponding to a first threshold voltage or more is applied to both ends of each of the first and second stick type LEDs LD1 and LD2 , both first and second blue lights may be emitted.

[0326] The first and second blue lights emitted from the first sub-pixel SP1 may be converted into red light by the first color conversion pattern CCP1 including red quantum dots.

[0327] In the second subpixel SP2 , when a set or predetermined voltage corresponding to the first threshold voltage or more is applied to both ends of each of the first and second stick type LEDs LD1 and LD2 , both first and second blue lights may be emitted.

[0328] The first and second blue lights emitted from the second sub-pixel SP2 may be converted into green light by the second color conversion pattern CCP2 including green quantum dots.

[0329] In the third subpixel SP3 , when set or predetermined voltages corresponding to the second threshold voltage or more and the first threshold voltage or less are applied to both ends of each of the first and second stick type LEDs LD1 and LD2 , only the second blue light may be emitted.

[0330] The second blue light emitted from the third sub-pixel SP3 may transmit the transparent layer.

[0331] As described above, according to an embodiment of the present disclosure, the first and second stick-type LEDs LD1 and LD2 configured to emit blue-based light having a short wavelength correspond to the first and second color conversion patterns CCP1 and CCP2, respectively, thereby improving the efficiency of light emitted from each of the first and second subpixels SP1 and SP2.

[0332] Therefore, the display apparatus according to the embodiment of the present disclosure may display an image with improved display quality.

[0333] The display device according to the embodiment of the present disclosure can be used in various suitable electronic devices. For example, the display device can be applied to televisions, notebook computers, cellular phones, smart phones, smart boards, PMPs, PDAs, navigation devices, various suitable wearable devices such as smart watches, etc.

[0334] According to an embodiment of the present disclosure, a display device that can improve display quality is provided.

[0335] For ease of description, spatially relative terms such as "below," "beneath," "lower," "under," "above," "upper," etc. may be used herein to describe the relationship of one element or feature to another element (or elements) or another feature (or features) as shown in the accompanying drawings. It should be understood that, in addition to the orientation drawn in the accompanying drawings, spatially relative terms are intended to cover different orientations of the device in use or in operation. For example, if the device in the accompanying drawings is flipped, the element described as being "below," "below," or "below" other elements or features will then be oriented "above" the other elements or features. Thus, the example terms "below" and "under" can cover both above and below orientations. The device can be oriented in other ways (e.g., rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein should be interpreted accordingly. Expressions such as "at least one of" modify the elements of the entire list when following a list of elements, without modifying the individual elements in the list.

[0336] As used herein, the terms "substantially," "about," and similar terms are used as terms of approximation and not as terms of degree, and are intended to take into account the inherent deviations in measurements or calculations that one of ordinary skill in the art would recognize. Furthermore, when describing embodiments of the present disclosure, the use of "may" means "one or more embodiments of the present disclosure." As used herein, the terms "use," "using," and "used" may be considered synonymous with the terms "utilize," "utilizing," and "utilized," respectively. Additionally, the term "exemplary" is intended to mean an example or illustration.

[0337] In addition, any numerical range recorded herein is intended to include all subranges of the same numerical precision included in the recorded range. For example, the range of "1.0 to 10.0" is intended to include all subranges between the recorded minimum value of 1.0 and the recorded maximum value of 10.0, that is, having a minimum value equal to or greater than 1.0 and a maximum value equal to or less than 10.0, such as, for example, 2.4 to 7.6. Any maximum numerical limit recorded herein is intended to include all lower numerical limits included therein, and any minimum numerical limit recorded in the specification is intended to include all higher numerical limits included therein. Therefore, the applicant reserves the right to amend this specification (including the claims) to explicitly record any subranges included in the range explicitly recorded herein.

[0338] Exemplary embodiments have been disclosed herein, and although specific terms are employed, they are used and should be interpreted in a generic and descriptive sense only and not for purposes of limitation. In some instances, as will be apparent to one of ordinary skill in the art upon filing this application, features, characteristics, and / or elements described in conjunction with a particular embodiment may be used alone or in combination with features, characteristics, and / or elements described in conjunction with other embodiments, unless expressly noted otherwise. Accordingly, it will be understood by those skilled in the art that various changes in form and details may be made without departing from the spirit and scope of the present disclosure as set forth in the appended claims and their equivalents.

Claims

1. Display devices, including: A substrate including a display area and a non-display area; a plurality of pixels disposed in the display area, the plurality of pixels including a first sub-pixel, a second sub-pixel, and a third sub-pixel each having a light-emitting area configured to emit light; a first light-emitting element and a second light-emitting element, the first light-emitting element being disposed in each of the first sub-pixel and the second sub-pixel and configured to emit light of a first color, and the second light-emitting element being disposed in the third sub-pixel and configured to emit light of a second color, wherein each of the first light-emitting element and the second light-emitting element is disposed on the substrate and has a first end portion and a second end portion in a length direction at which a first semiconductor and a second semiconductor are disposed, respectively; a first partition wall and a second partition wall, wherein the first partition wall, the first end portion and the second end portion of each of the first light-emitting element and the second light-emitting element, and the second partition wall are arranged sequentially in the length direction; a first electrode disposed on the first partition wall, the first electrode being spaced apart from the first end portion of each of the first light emitting element and the second light emitting element; a second electrode provided on the second partition wall, the second electrode being spaced apart from the second end portion of each of the first light emitting element and the second light emitting element; and A color conversion layer is provided on the first light emitting element and the second light emitting element, wherein the color conversion layer is configured to convert the first color light into light of a set color for each corresponding sub-pixel; wherein the color conversion layer includes a first color conversion pattern, a second color conversion pattern, a third color conversion pattern, and a light blocking pattern disposed between the first color conversion pattern, the second color conversion pattern, and the third color conversion pattern; Wherein, the display device further includes: an anti-reflection layer comprising a plurality of color filters corresponding to the first sub-pixel, the second sub-pixel, and the third sub-pixel and a black matrix disposed between the plurality of color filters; and a planarization layer, disposed above the anti-reflection layer; Wherein, the lower surface of the anti-reflection layer is in direct contact with the upper surface of the color conversion layer.

2. The display device according to claim 1, wherein The first color light and the second color light include blue-based light, and the first color light has a wavelength shorter than that of the second color light.

3. The display device according to claim 2, wherein The first color conversion pattern corresponds to the first sub-pixel, and the first color conversion pattern is configured to convert the first color light into red light; The second color conversion pattern corresponds to the second sub-pixel, and the second color conversion pattern is configured to convert the first color light into green light.

4. The display device according to claim 3, wherein The first color conversion pattern includes red quantum dots, and the second color conversion pattern includes green quantum dots.

5. The display device according to claim 3, wherein The third color conversion pattern corresponds to the third sub-pixel and is configured to allow the second color light to pass through the third color conversion pattern. The display device according to claim 5 , wherein: The third color conversion pattern includes any one of a transparent layer and a blue color filter.

7. The display device according to claim 2, wherein: Each of the first light-emitting element and the second light-emitting element includes: a first semiconductor layer doped with a first conductive dopant; a second semiconductor layer doped with a second conductive dopant; and The active layer is arranged between the first semiconductor layer and the second semiconductor layer.

8. The display device according to claim 7, wherein: Each of the first light emitting element and the second light emitting element includes a light emitting diode having a micrometer or nanometer scale and having a cylindrical column shape or a polygonal column shape.

9. The display device according to claim 1, further comprising: a first contact electrode electrically coupling the first electrode to the first end portion of each of the first light emitting element and the second light emitting element; as well as A second contact electrode electrically couples the second electrode to the second end portion of each of the first light emitting element and the second light emitting element.

10. The display device according to claim 2, wherein Each of the first sub-pixel, the second sub-pixel, and the third sub-pixel includes at least one transistor disposed on the substrate to be coupled to a corresponding light emitting element among the first light emitting element and the second light emitting element.

11. Display devices, including: A substrate including a display area and a non-display area; a plurality of pixels disposed in the display area, the plurality of pixels including a first sub-pixel, a second sub-pixel, and a third sub-pixel each having a light-emitting area configured to emit light; a light-emitting element disposed in each of the first sub-pixel, the second sub-pixel, and the third sub-pixel, the light-emitting element being configured to emit light, wherein the light-emitting element is disposed on the substrate and has a first end portion and a second end portion in a length direction at which a first semiconductor and a second semiconductor are disposed, respectively; a first partition wall and a second partition wall, wherein the first partition wall, the first end portion, the second end portion, and the second partition wall are arranged sequentially in the length direction; a first electrode disposed on the first partition wall, the first electrode being spaced apart from the first end portion; a second electrode disposed on the second partition wall, the second electrode being spaced apart from the second end portion; and a color conversion layer provided on the light emitting element, the color conversion layer being configured to convert the light emitted from the light emitting element into light of a set color; The light-emitting element includes a first light-emitting element configured to emit a first color light and a second light-emitting element configured to emit a second color light. wherein the first light emitting element and the second light emitting element are mixed and disposed in each of the first sub-pixel, the second sub-pixel, and the third sub-pixel, and wherein the color conversion layer includes a first color conversion pattern, a second color conversion pattern, a third color conversion pattern, and a light blocking pattern disposed between the first color conversion pattern, the second color conversion pattern, and the third color conversion pattern; wherein the display device further includes: an anti-reflection layer comprising a plurality of color filters corresponding to the first sub-pixel, the second sub-pixel, and the third sub-pixel and a black matrix disposed between the plurality of color filters; and a planarization layer, disposed above the anti-reflection layer; Wherein, the lower surface of the anti-reflection layer is in direct contact with the upper surface of the color conversion layer.

12. The display device according to claim 11, wherein The first color light and the second color light include blue-based light, and the first color light has a wavelength shorter than that of the second color light.

13. The display device according to claim 12, wherein: The first light emitting element and the second light emitting element have different threshold voltages.

14. The display device according to claim 12, wherein: The first color conversion pattern is disposed in the first sub-pixel, and the first color conversion pattern is configured to convert the first color light and the second color light into red light; The second color conversion pattern is disposed in the second sub-pixel, and the second color conversion pattern is configured to convert the first color light and the second color light into green light.

15. The display device according to claim 14, wherein The first color conversion pattern includes red quantum dots, and the second color conversion pattern includes green quantum dots.

16. The display device according to claim 11, wherein When viewed on a plane, the first light emitting elements and the second light emitting elements are alternately arranged in corresponding sub-pixels along one direction of the substrate.

Images