Light-emitting device

Abstract

According to an aspect of the present invention, a light-emitting device may be provided, the light-emitting device comprising: a substrate; a plurality of light-emitting elements disposed on the upper surface of the substrate to generate light; a first electrode disposed between the substrate and the plurality of light-emitting elements and electrically connected to the plurality of light-emitting elements; and a second electrode spaced apart from the substrate and electrically connected to the plurality of light-emitting devices, wherein the first electrode and the second electrode are spaced apart from each other in the vertical direction by at least one light-emitting element from among the plurality of light-emitting elements and, when viewed from above, intersect at the one light-emitting element and extend.

Description

Light-emitting device

[0001] The present invention relates to a light-emitting device.

[0002] Light-emitting diodes (LEDs) are widely used in recent light-emitting devices. These diodes utilize the properties of compound semiconductors to convert electrical signals into light, such as infrared, visible light, and ultraviolet light.

[0003] As the luminous efficiency of light-emitting diodes increases, light-emitting elements are being applied to various fields including display devices, lighting equipment, vehicle lamps, and ships.

[0004] Embodiments of the present invention have been invented against the background described above, and are directed to providing a light-emitting device including a plurality of light-emitting elements that can operate individually to generate light.

[0005] According to one aspect of the present invention, a light emitting device may be provided, comprising: a substrate; a plurality of light emitting elements arranged on an upper surface of the substrate and emitting light; a first electrode arranged between the substrate and the plurality of light emitting elements and electrically connected to the plurality of light emitting elements; and a second electrode spaced apart from the substrate and electrically connected to the plurality of light emitting elements, wherein the first electrode and the second electrode are spaced apart from each other in a vertical direction by at least one light emitting element among the plurality of light emitting elements, and extend in an intersecting manner from the one light emitting element when viewed from above.

[0006] In addition, a light emitting device may be provided in which the intersection point where the first electrode and the second electrode intersect is in the shape of a square or diamond.

[0007] In addition, a light-emitting device may be provided in which the first electrode extends in one direction and is connected to the plurality of light-emitting elements, the second electrode extends in a direction different from the one direction and is connected to the plurality of light-emitting elements, a length of the first electrode perpendicular to the one direction is 70% or less of a length of the one light-emitting element perpendicular to the one direction, and a length of the second electrode perpendicular to the other direction is 70% or less of a length of the one light-emitting element perpendicular to the other direction.

[0008] In addition, a light-emitting device may be provided in which the area of ​​the upper surface of the one light-emitting element is 60% or more of the area projected by the first electrode toward the one light-emitting element.

[0009] In addition, a light emitting device may be provided in which the first electrode and the second electrode are formed in a plurality, and each of the plurality of light emitting elements includes a first conductive semiconductor layer connected to the first electrode; an active layer laminated on the first conductive semiconductor layer; and a second conductive semiconductor layer connected to the second electrode, wherein the active layer is disposed above the center of the light emitting element.

[0010] In addition, a light emitting device may be provided in which each of the plurality of light emitting elements further includes an insulating layer covering the first conductive semiconductor layer, the active layer, and the second conductive semiconductor layer, an insulating layer opening is formed in the insulating layer, and the plurality of second electrodes are electrically connected to the first conductive semiconductor layer, the active layer, or the second conductive semiconductor layer through the insulating layer opening.

[0011] Additionally, a light emitting device may be provided in which, when viewed from the top, the edge of the insulating layer opening is positioned inward from the edge of the second electrode.

[0012] In addition, a light-emitting device may be provided in which the second electrode is electrically connected to one of the plurality of light-emitting elements and a light-emitting element adjacent to the one light-emitting element, and a virtual line connecting the center of the insulating layer opening of the one light-emitting element and the center of the insulating layer opening of the adjacent light-emitting element is arranged to be offset from a side surface of the second electrode.

[0013] In addition, a light emitting device may be provided in which a plurality of light emitting elements have unevenness formed on the lower surface thereof.

[0014] In addition, a light-emitting device may be provided in which the second electrode is bent downward so as to be positioned lower than the upper portions of the plurality of light-emitting elements among the plurality of light-emitting elements.

[0015] In addition, a light-emitting device may be provided, including: a substrate; a plurality of first light-emitting elements disposed on the substrate; a plurality of second light-emitting elements disposed above the plurality of first light-emitting elements; a plurality of third light-emitting elements disposed above the plurality of second light-emitting elements; a plurality of first electrodes disposed between the plurality of first light-emitting elements and the substrate and electrically connected to the plurality of light-emitting elements; a plurality of second electrodes disposed between the plurality of first light-emitting elements and the plurality of second light-emitting elements and electrically connected to the plurality of second light-emitting devices; a plurality of third electrodes disposed between the plurality of second light-emitting elements and the plurality of third light-emitting elements and electrically connected to the plurality of light-emitting devices; and a plurality of common electrodes electrically connected to the plurality of first light-emitting elements, the plurality of second light-emitting elements, and the plurality of third light-emitting elements.

[0016] In addition, a light emitting device may be provided in which the plurality of first electrodes are arranged to intersect the plurality of second electrodes or the plurality of third electrodes when viewed from above.

[0017] In addition, a light emitting device may be provided in which the plurality of first electrodes extend in one direction and are arranged to be spaced apart from each other in a direction different from the one direction and connected to some of the plurality of first light emitting elements, the plurality of second electrodes are arranged to be spaced apart from each other in the one direction and are extended in the other direction and connected to some of the plurality of second light emitting elements, and the plurality of third electrodes extend in the other direction and are arranged to be spaced apart from each other in the one direction.

[0018] In addition, a light-emitting device may be provided in which the plurality of first electrodes are arranged to extend in one direction and be spaced apart from each other in the other direction, or to extend in the other direction and be spaced apart from each other in the one direction, and are connected to some of the plurality of first light-emitting elements.

[0019] In addition, a light-emitting device may be provided in which each of the plurality of common electrodes includes a first common electrode disposed on the substrate and extending in the one direction; and a plurality of second common electrodes extending upward from the first common electrode and connected to any one of the plurality of first light-emitting elements, any one of the plurality of second light-emitting elements, and any one of the plurality of second light-emitting elements.

[0020] In addition, a light-emitting device may be provided in which some of the plurality of first light-emitting elements are arranged in the one direction and connected to one of the plurality of first electrodes, some of the plurality of second light-emitting elements are arranged in the one direction and connected to different second electrodes among the plurality of second electrodes, and some of the plurality of third light-emitting elements are arranged in the one direction and connected to different third electrodes among the plurality of third electrodes.

[0021] In addition, another part of the plurality of first light-emitting elements may be arranged in the other direction and connected to different first electrodes among the plurality of first electrodes, another part of the plurality of second light-emitting elements may be arranged in the other direction and connected to one of the plurality of second electrodes, and another part of the plurality of third light-emitting elements may be arranged in the other direction and connected to one of the plurality of third electrodes, and a light-emitting device may be provided.

[0022] In addition, a light emitting device may be provided, including a first cover layer covering the plurality of first light emitting elements and the plurality of first electrodes; a second cover layer disposed above the first cover layer and covering the plurality of second light emitting elements and the plurality of second electrodes; and a third cover layer disposed above the second cover layer and covering the plurality of third light emitting elements and the plurality of third electrodes, wherein a portion of the first cover layer is disposed between the plurality of first light emitting elements and the plurality of second electrodes, and a portion of the second cover layer is disposed between the plurality of second light emitting elements and the plurality of third electrodes.

[0023] In addition, a light emitting device may be provided, including: a substrate; a plurality of light emitting elements arranged on an upper surface of the substrate to generate light; a plurality of first electrodes arranged between the substrate and the plurality of light emitting elements, extending in one direction and spaced apart from each other in a direction different from the one direction and electrically connected to the plurality of light emitting elements; a plurality of second electrodes spaced apart from the substrate, extending in the other direction, spaced apart from each other in the one direction and electrically connected to the plurality of light emitting devices; and a cover layer covering the plurality of insulating layers, the plurality of first electrodes, and the plurality of second electrodes.

[0024] In addition, a light emitting device may be provided, further including an outer layer laminated on the cover layer.

[0025] One embodiment of the present invention has the effect that a plurality of light-emitting elements can be individually driven.

[0026] In addition, one embodiment of the present invention has the effect that defective elements of a light-emitting device can be minimized and light efficiency can be improved.

[0027] In addition, one embodiment of the present invention has the effect that light extraction efficiency can be improved because light can be prevented from being absorbed inside the second conductive semiconductor layer.

[0028] In addition, one embodiment of the present invention has the effect that the light emitting element can be protected from the external environment by the insulating layer.

[0029] In addition, one embodiment of the present invention has the effect that light can be diffused by the unevenness, thereby increasing the light extraction efficiency of the light-emitting element.

[0030] In addition, one embodiment of the present invention has the effect that the reliability of the light-emitting device can be improved because a plurality of light-emitting elements, a plurality of first electrodes, and a plurality of second electrodes can be protected by a cover layer.

[0031] In addition, one embodiment of the present invention has the effect that the cover layer can prevent a plurality of light-emitting elements, a plurality of first electrodes, and a plurality of second electrodes from being detached or peeled off from the light-emitting device (1).

[0032] Figure 1 is a perspective view of a light emitting device according to a first embodiment of the present invention.

[0033] Figure 2 is a plan view of the light emitting device of Figure 1 viewed from above.

[0034] Figure 3 is a cross-sectional view taken along line A-A' of Figure 2.

[0035] Figure 4 is a cross-sectional view taken along line B-B' of Figure 2.

[0036] Fig. 5 is a drawing showing the color coordinate area of ​​light of the light emitting device of Fig. 1.

[0037] FIG. 6 is a drawing showing a state in which a virtual line connecting the centers of the insulating layer openings of the light-emitting elements arranged adjacent to each other among the plurality of light-emitting elements of the light-emitting device of FIG. 1 and the extension direction of the second electrode are arranged at an angle to each other.

[0038] Fig. 7 is a drawing showing a shape in which the intersection between the second electrode and the first electrode of the light-emitting device of Fig. 1 is in a square shape.

[0039] Fig. 8 is a drawing showing the intersection between the second electrode and the first electrode of the light-emitting device of Fig. 1 in the shape of a marmot.

[0040] Fig. 9 is a drawing showing the first electrode of the light-emitting device of Fig. 1 projected onto the light-emitting element to form a projection area.

[0041] Fig. 10 is a drawing showing a projection area formed by projecting the second electrode of the light-emitting device of Fig. 1 onto the light-emitting element.

[0042] Fig. 11 is a drawing showing the second electrode of the light emitting device of Fig. 1 bent downward.

[0043] Fig. 12 is a drawing showing the second electrode of the light-emitting device of Fig. 1 connected to the light-emitting element through the cover layer opening.

[0044] Fig. 13 is a cross-sectional view of a light emitting device according to a second embodiment of the present invention.

[0045] Fig. 14 is a perspective view of a light emitting device according to a third embodiment of the present invention.

[0046] Fig. 15 is a cross-sectional view of the light emitting device of Fig. 14.

[0047] Fig. 16 is a perspective view of a light emitting device according to a fourth embodiment of the present invention.

[0048] Fig. 17 is a perspective view of a light emitting device according to a fifth embodiment of the present invention.

[0049] Hereinafter, specific embodiments for implementing the technical idea of ​​the present invention will be described in detail with reference to the drawings.

[0050] In addition, when explaining the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description is omitted.

[0051] Additionally, when it is said that a component is 'connected to', 'supported by', or 'supplied by' another component, it should be understood that it may be directly connected to, supported by, or supplied to that other component, but there may also be other components present in between.

[0052] The terminology used herein is intended solely to describe specific embodiments and is not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

[0053] Additionally, please note that the terms "upper," "lateral," "upper," "lower," and "up-down" in this specification are based on the drawings and may be expressed differently if the orientation of the object changes. For the same reason, some components in the attached drawings are exaggerated, omitted, or schematically depicted, and the size of each component does not fully reflect the actual size.

[0054] Additionally, terms that include ordinal numbers, such as "first," "second," etc., may be used to describe various components, but these components are not limited by such terms. These terms are used solely to distinguish one component from another.

[0055] The term "comprising" as used in the specification means specifying a particular characteristic, region, integer, step, operation, element and / or component, but does not exclude the presence or addition of other particular characteristics, regions, integers, steps, operations, elements, components and / or groups.

[0056] Hereinafter, a light emitting device (1) according to the first embodiment of the present invention will be described.

[0057] Referring to FIGS. 1 to 4, a light-emitting device (1) according to a first embodiment of the present invention can receive power from the outside and generate light. This light-emitting device (1) can display characters, symbols, images, or videos, etc. In addition, the light-emitting device (1) can be mounted on a vehicle. In other words, the light-emitting device (1) can be included in a taillight, a headlight, a rear lamp, a tail lamp, an interior light, etc. In addition, the light-emitting device (1) can be a high-quality display device with a clear contrast ratio and a clear contrast by reducing optical interference between a plurality of light-emitting elements (200) (light emitters) and minimizing interference between driving areas. In addition, the light-emitting device (1) can also be applied to UV, blue light elements, IR elements, cyan (autonomous driving laser), etc. Such a light-emitting device (1) may include a substrate (100), a plurality of light-emitting elements (200), a plurality of electrodes (300), an adhesive layer (400), and a cover layer (500).

[0058] A plurality of light emitting elements (200), a plurality of electrodes (300), an adhesive layer (400), and a cover layer (500) may be arranged on a substrate (100). For example, the substrate (100) may be a printed circuit board (PCB) substrate on which an electric circuit is printed. In addition, the substrate (100) may be a thin-film transistor (TFT) backplane. The substrate (100) may include an alloy composed of one or more or a part of Cu, Zn, Au, Ni, Al, Mg, Cd, Be, W, Mo, Si, Ag, and Fe having electrical conductivity, thereby increasing thermal and electrical conductivity. However, this is merely an example, and the substrate (100) may also include one or more of insulating materials such as FR1, CEM-1, FR-4, PMMA, PCT, and PPA, thereby preventing short circuits between each circuit. Here, FR1 is a material in which copper foil and laminated paper are laminated, and CEM-1 is a material in which copper foil, glass fiber fabric, laminated paper, and glass fiber fabric are sequentially laminated. In addition, FR-4 is a material in which copper foil and glass fiber fabric or glass fiber fabric are laminated. In addition, the substrate (100) may include ceramics such as alumina (Al2O3), aluminum nitride (AlN), and Zirconia Toughened Alumina (ZTA).

[0059] The substrate (100) may be a flexible substrate that can freely form a curved shape. The substrate (100) may include a light-transmitting material that can transmit light emitted from a plurality of light-emitting elements (200). In addition, the substrate (100) may include a light guide structure that can guide light emitted from a plurality of light-emitting elements (200), but is not limited thereto and may be implemented with various materials and shapes.

[0060] A plurality of light-emitting elements (200) can generate light. The plurality of light-emitting elements (200) are electrically connected to the electric circuit of the substrate (100) and can receive electricity from the outside through the electric circuit to generate light. The plurality of light-emitting elements (200) can be arranged adjacent to each other and can each generate light. For example, the plurality of light-emitting elements (200) can be arranged in N rows and M columns and can each generate light. In other words, the plurality of light-emitting elements (200) can be arranged in N×M matrices and can each generate light. The number of rows, N, and the number of columns, M, of the plurality of light-emitting elements (200) can be the same or different. In addition, the plurality of light-emitting elements (200) can be driven individually. The driving voltage of the plurality of light-emitting elements (200) can be 3 V or less. Therefore, it is possible to prevent materials constituting the light-emitting device (1) from being deformed due to heat generation. One of the multiple light emitting elements (200) is 10mA / 100um 2 The EQE value may be 80% or more. In addition, any one of the plurality of light-emitting elements (200) may have a profile in which the luminous intensity increases in the range of 0 to 10 mA.

[0061] The plurality of light-emitting elements (200) can generate light of different colors. Alternatively, the difference in peak wavelengths of light generated from the plurality of light-emitting elements (200) may be 5 nm or less. The plurality of light-emitting elements (200) may also generate light of the same color. Each of the plurality of light-emitting elements (200) may generate blue, green, red, white light, UV light, etc. For example, at least one of the plurality of light-emitting elements may generate light having a peak wavelength in the blue region, light having a peak wavelength in the green region, or light having a peak wavelength in the red region. In addition, the light-emitting element (200) may emit light having a peak wavelength in the cyan region.

[0062] In addition, the plurality of light-emitting elements (200) can emit light having a peak wavelength in a region other than visible light. The plurality of light-emitting elements (200) can be UVA, UVB, or UVC elements having a peak wavelength in the ultraviolet region. In addition, the light-emitting element (200) can be an IR element. When the light-emitting element (200) is an ultraviolet light-emitting element having a peak wavelength in the ultraviolet region, the mounting rate of the light-emitting element (200) can be improved, and the amount of light can be improved, thereby increasing the curing or sterilization efficiency.

[0063] Referring further to FIG. 5, when the light emitting element (200) emits light having a center wavelength in the cyan region, the color coordinate region (X, Y) of the light emitted by the light emitting element (200) can be formed within a region linearly connecting the respective coordinates of (0.14, 0.025), (0.06, 0.2), (0.02, 0.4), (0.1, 0.45), (0.2, 0.1), and (0.14, 0.025). When the light emitting element (200) emits light having a peak wavelength in the cyan region, the light emitting device (1) can be applied to a vehicle such as an electric vehicle.

[0064] The horizontal or vertical length of the plurality of light-emitting elements (200) may be 50 μm or less. Specifically, the horizontal or vertical length of the light-emitting element (200) may be 20 μm. When the horizontal or vertical size of the light-emitting element (200) is 50 μm or less, the number of light-emitting elements that can be mounted relative to the area of ​​the substrate (100) may increase. When the horizontal or vertical size of the light-emitting element (200) is 50 μm or less, the defect elements of the light-emitting elements produced from one wafer may be reduced. When the horizontal or vertical size of the light-emitting element (200) is 50 μm or less, the defect elements of the light-emitting element (200) are minimized, thereby improving the purity of the light-emitting element (200) and improving the luminous efficiency. In addition, defects are reduced at high currents, and the reliability of the light-emitting element (200) may be improved.

[0065] Each of the plurality of light-emitting elements (200) may include a first conductive semiconductor layer (210), an active layer (220), a second conductive semiconductor layer (230), and an insulating layer (240).

[0066] The first conductive semiconductor layer (210) is a semiconductor layer having a polarity opposite to that of the second conductive semiconductor layer (230). The first conductive semiconductor layer (210) may include an n-type impurity (e.g., Si, Ge, Sn). In this case, the first conductive semiconductor layer (210) may be an n-type semiconductor layer. However, this is merely an example, and the first conductive semiconductor layer (210) may also include a p-type impurity.

[0067] The active layer (220) may be laminated on the first conductive semiconductor layer (210). In other words, the active layer (220) may be positioned between the first conductive semiconductor layer (210) and the second conductive semiconductor layer (230). In addition, the active layer (220) may be positioned to one side relative to the center of the thickness of the light emitting element (200). By virtue of the active layer (220), the vertical length of the first conductive semiconductor layer (210) may be formed to be greater than the vertical length of the second conductive semiconductor layer (230).

[0068] The second conductive semiconductor layer (230) may be stacked on the active layer (220). The second conductive semiconductor layer (230) may include a p-type impurity (e.g., Mg, Sr, Ba), in which case the second conductive semiconductor layer (230) may be a p-type semiconductor layer. However, this is merely an example, and the second conductive semiconductor layer (230) may also include an n-type impurity. Light generated in the active layer (220) may pass through the second conductive semiconductor layer (230) and be emitted to the outside.

[0069] The vertical length of the second conductive semiconductor layer (230) may be formed to be smaller than the vertical length of the first conductive semiconductor layer (210). By virtue of the second conductive semiconductor layer (230), light may be prevented from being absorbed within the second conductive semiconductor layer (230), and thus light extraction efficiency may be improved. In addition, by virtue of the second conductive semiconductor layer (230), the length from the active layer (220) to the upper surface of the cover layer (500) may be formed to be short, and thus the light extraction efficiency of the light-emitting element (200) may be improved and the clarity may be increased.

[0070] The insulating layer (240) can cover the outer surfaces of the first conductive semiconductor layer (210), the active layer (220), and the second conductive semiconductor layer (230). This insulating layer (240) can protect the light emitting element (200) from the external environment. The insulating layer (240) can protect the light emitting element (200) from moisture or physical pressure, thereby improving the reliability of the light emitting element (200). An insulating layer opening (241) can be formed in the insulating layer (240). By this insulating layer opening (241), a plurality of second electrodes (320) can be electrically connected to the first conductive semiconductor layer (210), the active layer (220), or the second conductive semiconductor layer (230). The insulating layer opening (241) may extend in other directions and may have a circular shape. The length (width) (w1) of the insulating layer opening (241) in one direction may be formed to be smaller than the length (width) (w2) of the second electrode (320) in one direction. Even if the arrangement of the plurality of light-emitting elements (200) is misaligned or the position of the insulating layer opening (241) is misaligned due to the length of the insulating layer opening (241), the plurality of light-emitting elements (200) and the second electrode (320) may be stably electrically connected. Referring further to FIG. 6, an imaginary line (x1) connecting the centers of the insulating layer openings (241) arranged in each of at least two adjacent light-emitting elements (200) may not be parallel to the side surface of the second electrode (320). In other words, the imaginary line (x1) and the side surface of the second electrode (320) may be misaligned.

[0071] In addition, unevenness (250) may be formed on the lower surface of the plurality of light-emitting elements (200). For example, the unevenness (250) may be a pattern that protrudes in an irregular shape from the lower surface of the light-emitting element (200) toward the substrate (100). As another example, the unevenness (250) may be a pattern that protrudes in an irregular shape from the surface of the first conductive semiconductor layer (210) toward the active layer (220). The unevenness (250) may include two or more layers having different doping concentrations. The unevenness (250) may have a region containing different materials. The unevenness (250) may include a region where a curved portion and a straight portion intersect each other. By the unevenness (250), light emitted from the active layer (220) of the light-emitting element (200) may be diffused, thereby improving the light extraction efficiency of the light-emitting element (200). Additionally, the unevenness (250) can improve the light extraction efficiency of light reflected by the adhesive layer (400).

[0072] In addition, the light emitting element (200) may be formed in a structure in which the horizontal length changes as it goes up and down. For example, the light emitting element (200) may be formed such that the horizontal length of the upper side is greater than the horizontal length of the lower side. In other words, the horizontal length of the second conductive semiconductor layer (230) may be greater than the horizontal length of the first conductive semiconductor layer (210). The side surface of the light emitting element (200) may be formed as an inclined surface to form an obtuse angle with the upper surface of the light emitting element (200) or the lower surface of the light emitting element (200). If the side surface of the light emitting element (200) is formed as an inclined surface, the phenomenon in which current is concentrated at the corner of the light emitting element (200) may be reduced.

[0073] A plurality of electrodes (300) may be electrically connected to a plurality of light-emitting elements (200) so that light is generated from the plurality of light-emitting elements (200). The plurality of electrodes (300) may be a circuit pattern that supplies electricity to the plurality of light-emitting elements (200). The plurality of electrodes (300) may include various circuit elements that supply electricity. In addition, the plurality of electrodes (300) may include a conductive material. The plurality of electrodes (300) may be transparent electrodes. For example, the electrodes (300) may include metal, Al, Ni, Ti, Cr, ITO, ZnO IZO, etc. The plurality of electrodes (300) may include a first electrode (310) and a second electrode (320).

[0074] The first electrode (310) may be formed in a plurality of pieces and may be electrically connected to a plurality of light-emitting elements (200). The plurality of first electrodes (310) may be arranged between the substrate (100) and the plurality of light-emitting elements (200). The plurality of first electrodes (310) may be electrically connected to the first conductive semiconductor layers (210) of the plurality of light-emitting elements (200).

[0075] The plurality of first electrodes (310) may be arranged to extend and intersect with the plurality of second electrodes (320) when viewed from above. For example, the plurality of first electrodes (310) and the plurality of second electrodes (320) may be arranged to be perpendicular to each other when viewed from above, or may be arranged to be offset from each other so as to form a predetermined angle. However, the present invention is not limited thereto, and the plurality of first electrodes (310) and the plurality of second electrodes (320) may extend in the same direction. When viewed from above, the angle formed by the first electrodes (310) and the second electrodes (320) may be an acute angle. The plurality of first electrodes (310) and the plurality of second electrodes (320) may be spaced apart from each other in the vertical direction while intersecting each other. Therefore, short circuits can be prevented by arranging the first electrodes (310) and the second electrodes (320) to be far apart from each other. In addition, when viewed from above, the area of ​​the electrode overlapping the light emitting element (200) can be minimized, so that the light emitted from the light emitting element (200) can be minimized from being absorbed by the electrode.

[0076] Referring further to Fig. 7, as an example, when viewed from above, a shape formed by the intersections where a plurality of first electrodes (310) and a plurality of second electrodes (320) are arranged and the first electrodes (310) and the second electrodes (320) intersect may be a square. Referring further to Fig. 8, as another example, when viewed from above, a shape formed by the intersections where a plurality of first electrodes (310) and a plurality of second electrodes (320) are arranged and the first electrodes (310) and the second electrodes (320) intersect may be a diamond shape.

[0077] A plurality of first electrodes (310) may extend in one direction and be spaced apart from each other in a direction different from the one direction. The other direction may be a vertical direction, but is not limited thereto. For example, the plurality of first electrodes (310) may be formed in a plurality of columns or a plurality of rows on the substrate (100). Any one of the plurality of first electrodes (310) may be connected to any one of the plurality of light-emitting elements (200) arranged in one direction. Another one of the plurality of first electrodes (310) may be connected to another one of the plurality of light-emitting elements (200) arranged in one direction. In addition, another one of the plurality of first electrodes (310) may be connected to another one of the plurality of light-emitting elements (200) arranged in one direction. In other words, each of the first electrodes (310) may be connected to two or more light-emitting elements (200).

[0078] The length (width) of each of the plurality of first electrodes (310) in the other direction may be formed to be smaller than the length of the light-emitting element (200) in the other direction. For example, the length of each of the plurality of first electrodes (310) in the other direction may be 70% or less of the length of the light-emitting element (200) in the other direction. Specifically, the length of each of the plurality of first electrodes (310) in the other direction may be 50% or less or 30% or less of the length of the light-emitting element (200) in the other direction.

[0079] Referring further to FIG. 9, when any one of the plurality of first electrodes (310) is projected toward any one of the plurality of light-emitting elements (200), the area (A1) of the upper surface of the light-emitting element (200) may be 60% or more of the projected area (A2). Accordingly, the driving voltage of the light-emitting element (200) may be lowered while light absorption by the first electrode (310) is minimized. The first region of the first conductive semiconductor layer (210) to which the first electrode (310) supplies current may be arranged inward and spaced apart from the outer periphery of the light-emitting element (200). The outer surface of the first conductive semiconductor layer (210) may provide a leakage path due to oxidation, damage, or an uneven surface. By arranging the first region of the first conductive semiconductor layer (210) that receives current through the first electrode (310) toward the inner side of the outer surface of the light-emitting element (200), the current supplied to the light-emitting element (200) can be prevented from flowing through the leakage path.

[0080] The thickness of the first electrode (310) may be thinner than the thickness of the insulating layer (240). Therefore, it is possible to prevent it from breaking due to stress when passing over a step such as the side of the insulating layer opening (241) or when formed on an uneven surface.

[0081] The second electrode (320) may be formed in a plurality of pieces and may be electrically connected to a plurality of light-emitting elements (200). The plurality of second electrodes (320) may be arranged to be spaced apart from the substrate (100) upward. In other words, the plurality of second electrodes (320) may be supported by the cover layer (500) and arranged on the upper side of the plurality of light-emitting elements (200). These plurality of second electrodes (320) may be electrically connected to the second conductive semiconductor layer (230) of the plurality of light-emitting elements (200).

[0082] The plurality of second electrodes (320) may be arranged to extend in different directions and spaced apart from each other in one direction. For example, the plurality of second electrodes (320) may be arranged in a plurality of columns or a plurality of rows. Any one of the plurality of second electrodes (320) may be connected to any one of the plurality of light-emitting elements (200) arranged in the different direction. Another one of the plurality of second electrodes (320) may be connected to another one of the plurality of light-emitting elements (200) arranged in the different direction. In addition, another one of the plurality of second electrodes (320) may be connected to another one of the plurality of light-emitting elements (200) arranged in one direction. In other words, each of the plurality of second electrodes (320) may be connected to two or more light-emitting elements (200).

[0083] The length (width) of each of the plurality of second electrodes (320) in one direction may be formed to be smaller than the length of the light-emitting element (200) in one direction. For example, the length of each of the plurality of second electrodes (320) in one direction may be 70% or less of the length of the light-emitting element (200) in one direction. Specifically, the length of each of the plurality of second electrodes (320) in one direction may be 50% or less or 30% or less of the length of the light-emitting element (200) in one direction.

[0084] Referring further to FIG. 10, when any one of the plurality of second electrodes (320) is projected toward any one of the plurality of light-emitting elements (200), the area (A3) of the lower surface of the light-emitting element (200) may be 60% or more of the projection area (A4). Specifically, when any one of the plurality of second electrodes (320) is projected toward any one of the plurality of light-emitting elements (200), the projection area (A4) may be 40% or less or 20% or less of the area (A3) of the lower surface of the light-emitting element (200). By virtue of the thin area of ​​the plurality of second electrodes (320), light absorption by the second electrodes (320) can be minimized, thereby increasing the light extraction efficiency of the light-emitting element (200) and lowering the driving voltage of the light-emitting element (200). The second region of the second conductive semiconductor layer (230) to which the second electrode (320) supplies current may be arranged inwardly and away from the outer surface of the light-emitting element (200). The outer surface of the second conductive semiconductor layer (230) may provide a leakage path due to oxidation, damage, or an uneven surface. By arranging the second region of the second conductive semiconductor layer (230) to which current is supplied by the second electrode (320) inwardly of the outer surface of the light-emitting element (200), the current supplied to the light-emitting element (200) can be prevented from flowing through the leakage path.

[0085] The thickness of the second electrode (320) may be thinner than the thickness of the insulating layer (240). This second electrode (320) can be prevented from being broken due to stress when it passes over a step such as the side of the insulating layer opening (241) or is formed on an uneven surface.

[0086] The adhesive layer (400) can adhere a plurality of light-emitting elements (200) to the substrate (100). The adhesive layer (400) can be disposed between the plurality of light-emitting elements (200) and the substrate (100). In addition, the adhesive layer (400) can include a plurality of conductive materials. The adhesive layer (400) can reflect light emitted from the light-emitting elements (200) with a predetermined reflectance. The reflectance of the adhesive layer (400) can be 50% or more. Specifically, the reflectance of the adhesive layer (400) can be 70% or more. However, in another form, the adhesive layer (400) can be a light-transmitting material. The adhesive layer (400) can also be omitted.

[0087] The cover layer (500) may be disposed on the substrate (100) to cover a plurality of light-emitting elements (200) and a plurality of electrodes (300). In other words, the cover layer (500) may cover at least a portion of the side surfaces and upper surfaces of the plurality of light-emitting elements (200). The cover layer (500) may be a light-transmitting layer or a transparent layer. In addition, the cover layer (500) may cover at least a portion of the plurality of first electrodes (310) and the plurality of second electrodes (320). The upper surface of the cover layer (500) may be formed flat, but is not limited thereto, and may have a curved region or an inclined region in at least one region. In addition, a pattern region in which a pattern is formed may be formed in at least one region of the cover layer (500).

[0088] In addition, the cover layer (500) may be disposed on the substrate (100) to press the plurality of light-emitting elements (200), the plurality of first electrodes (310), and the plurality of second electrodes (320) toward the substrate (100). This cover layer (500) may also be referred to as a material layer. The cover layer (500) covers the plurality of light-emitting elements (200), the plurality of first electrodes (310), and the plurality of second electrodes (320), thereby preventing the plurality of light-emitting elements (200), the plurality of first electrodes (310), and the plurality of second electrodes (320) from being detached or peeled off from the light-emitting device (1). In addition, the cover layer (500) may improve the reliability of the light-emitting device (1) by protecting the plurality of light-emitting elements (200), the plurality of first electrodes (310), and the plurality of second electrodes (320) mounted on the substrate (100). In addition, the cover layer (500) can diffuse light generated from the plurality of light-emitting elements (200). This cover layer (500) can improve light extraction efficiency by guiding light generated from the plurality of light-emitting elements (200).

[0089] In addition, the cover layer (500) may be a wavelength conversion layer. In other words, the cover layer (500) may include a wavelength converter. The wavelength converter may be excited by light generated from the plurality of light-emitting elements (200) and emit light having a center wavelength different from the center wavelength of the light generated from the plurality of light-emitting elements (200). The wavelength converter may be excited by light generated from the plurality of light-emitting elements (200) and emit light having a center wavelength longer than the center wavelength of the light emitted from the plurality of light-emitting elements (200). A plurality of such wavelength converters may be formed. The plurality of wavelength converters may be excited by light from the plurality of light-emitting elements (200) and emit light having different center wavelengths. Depending on the combination of the plurality of wavelength converters and the plurality of light-emitting elements (200), the light-emitting device (1) may be able to realize various colors that can be realized within the blue to red range. In addition, the light emitting device (1) can implement white light of various color temperatures by means of a wavelength converter.

[0090] In addition, referring further to FIG. 11, the cover layer (500) can support a plurality of second electrodes (320). A cover layer opening (500a) can be formed in the cover layer (500) so that the second electrode (320) is electrically connected to the light emitting element (200). The cover layer opening (500a) can be arranged between the second electrode (320) and the light emitting element (200) to provide a passage through which the second electrode (320) passes. In addition, the cover layer opening (500a) can be arranged above the insulating layer opening (241). The second electrode (320) extends from at least one light emitting element (200) to an adjacent light emitting element (200), and the cover layer (500) is arranged between the plurality of light emitting elements (200) so that the second electrode (320) can pass through the upper surface of the cover layer (500). When the second electrode (320) passes between a plurality of light-emitting elements (200), the cover layer (500) can support the second electrode (320), thereby preventing the second electrode (320) from coming close to the substrate (100) and making contact with the first electrode (310) and causing a short circuit, and by shortening the current path of the second electrode (320), the current movement speed can be increased.

[0091] In addition, referring further to FIG. 12, the plurality of second electrodes (320) may be arranged with a curved surface so as to be bent by the cover layer (500). For example, the second electrode (320) may be bent downward and supported by the cover layer (500) so as to be arranged lower than the upper portions of the plurality of light-emitting elements between the plurality of light-emitting elements. The stress applied to the second electrode (320) by the curved surface may be alleviated and the second electrode (320) may be prevented from breaking.

[0092] Hereinafter, the operation and effect of the light emitting device (1) according to the first embodiment of the present invention will be described.

[0093] Each of the plurality of light-emitting elements (200) of the light-emitting device (1) according to the first embodiment of the present invention can be electrically connected to the first electrode (310) and the second electrode (320) so as to be individually driven. Light generated from the plurality of light-emitting elements (200) can be emitted to the outside through the cover layer (500).

[0094] The multiple light emitting elements (200) of this light emitting device (1) can be individually driven.

[0095] In addition, the defective elements of the light emitting element (200) of the light emitting device (1) can be minimized and the light efficiency can be improved.

[0096] In addition, since light can be prevented from being absorbed inside the second conductive semiconductor layer (230) of the light emitting device (1), light extraction efficiency can be improved.

[0097] Additionally, the light emitting element (200) can be protected from the external environment by the insulating layer (240) of the light emitting device (1).

[0098] Additionally, light can be diffused by the irregularities (250), thereby increasing the light extraction efficiency of the light emitting element (200).

[0099] In addition, since a plurality of light-emitting elements (200), a plurality of first electrodes (310), and a plurality of second electrodes (320) can be protected by the cover layer (500), the reliability of the light-emitting device (1) can be improved.

[0100] Additionally, the cover layer (500) can prevent the plurality of light-emitting elements (200), the plurality of first electrodes (310), and the plurality of second electrodes (320) from being detached or peeled off from the light-emitting device (1).

[0101] Hereinafter, with reference to FIG. 13, a light emitting device (1) according to a second embodiment of the present invention will be described. In describing the second embodiment, there is a difference in that an outer layer (600) is further included, and this difference will be mainly described.

[0102] The outer layer (600) of the light-emitting device (1) according to the second embodiment of the present invention may be disposed on the cover layer (500). The outer layer (600) may be formed of a different material or a material having different properties from the cover layer (500). An interface may be formed between the outer layer (600) and the cover layer (500). The interface between the outer layer (600) and the cover layer (500) may include, but is not limited to, an irregular pattern region. In other words, the outer layer (600) and the cover layer (500) may be formed as a single molding layer. In addition, the outer layer (600) and the cover layer (500) may be formed of the same material and may be formed without an interface boundary. The upper surface of the outer layer (600) may be formed flat, but is not limited thereto, and at least one region of the upper surface of the outer layer (600) may include a curved region or an inclined region. The outer layer (600) can diffuse light. This outer layer (600) can be referred to as a diffusion layer.

[0103] Hereinafter, the operation and effect of the light emitting device (1) according to the second embodiment of the present invention will be described.

[0104] Light generated from multiple light-emitting elements (200) can sequentially pass through the cover layer (500) and the outer layer (600) and be emitted to the outside.

[0105] Since light can be diffused by the outer layer (600) of the light-emitting element (200), light extraction efficiency can be increased.

[0106] Hereinafter, a light emitting device (1) according to a third embodiment of the present invention will be described with reference to FIGS. 14 and 15.

[0107] In explaining the third embodiment, there is a difference in that the plurality of light-emitting elements (200) may include a plurality of first light-emitting elements (200a), a plurality of second light-emitting elements (200b), and a plurality of third light-emitting elements (200c), and the cover layer (500) may include a first cover layer (510), a second cover layer (520), and a third cover layer (530). Therefore, the explanation will focus on these differences.

[0108] A plurality of first light-emitting elements (130), a plurality of second light-emitting elements (200b), and a plurality of third light-emitting elements (200c) can be stacked upward.

[0109] A plurality of first light-emitting elements (200a) may be arranged on a substrate (100). The plurality of first light-emitting elements (200a) may be arranged in one direction and may be arranged in another direction. The plurality of light-emitting elements (200) may be arranged in N rows and M columns, and may each emit light. The plurality of first light-emitting elements (200a) may emit light of the same color, but is not limited thereto. In other words, some of the plurality of first light-emitting elements (200a) may emit light of a different color than other of the plurality of first light-emitting elements (200a). In addition, the plurality of first light-emitting elements (200a) may emit light of a different color than the plurality of second light-emitting elements (200b) and the plurality of third light-emitting elements (200c). For example, the plurality of first light-emitting elements (200a) may emit red light.

[0110] The plurality of second light-emitting elements (200b) may be arranged above the plurality of first light-emitting elements (200a). In addition, the plurality of second light-emitting elements (200b) may be arranged in one direction and in another direction. For example, the plurality of second light-emitting elements (200b) may be arranged in N rows and M columns to respectively generate light. In addition, the plurality of second light-emitting elements (200b) may be arranged so as to overlap the plurality of first light-emitting elements (200a) when viewed from above. In other words, the first light-emitting elements (200b) may be arranged so that at least a portion thereof is positioned in an upper region of each of the plurality of first light-emitting elements (200a).

[0111] The plurality of second light-emitting elements (200b) may emit light of the same color, but is not limited thereto. In other words, some of the plurality of second light-emitting elements (200b) may emit light of a different color than other parts of the plurality of second light-emitting elements (200b). For example, the plurality of second light-emitting elements (200b) may emit green light.

[0112] The plurality of third light-emitting elements (200c) may be arranged above the plurality of second light-emitting elements (200b). In addition, the plurality of third light-emitting elements (200c) may be arranged in one direction and in another direction. For example, the plurality of third light-emitting elements (200c) may be arranged in N rows and M columns to respectively generate light. In addition, the plurality of third light-emitting elements (200c) may be arranged so as to overlap the plurality of first light-emitting elements (200a) and the plurality of second light-emitting elements (200b) when viewed from above. In other words, the third light-emitting elements (200c) may be arranged so that at least a portion thereof is positioned in a region directly above each of the plurality of second light-emitting elements (200b).

[0113] The plurality of third light-emitting elements (200c) may emit light of the same color, but is not limited thereto. In other words, some of the plurality of third light-emitting elements (200c) may emit light of a different color than other third light-emitting elements (200c). For example, the plurality of third light-emitting elements (200c) may emit blue light.

[0114] Meanwhile, the first light-emitting element (200a), the second light-emitting element (200b), and the third light-emitting element (200c), which are at least partially overlapped when viewed from above, may be configured as one light-emitting module. In other words, the light-emitting device (1) may include a plurality of light-emitting modules.

[0115] In order to operate the plurality of first light-emitting elements (200a), the plurality of second light-emitting elements (200b), and the plurality of third light-emitting elements (200c), the plurality of electrodes (300) may include a plurality of first electrodes (310), a plurality of second electrodes (320), a plurality of third electrodes (330), and a plurality of common electrodes (340). Meanwhile, the first electrode (310) and the second electrode (320) in the second embodiment may be arranged differently from the first electrode (310) and the second electrode (320) in the first embodiment described above.

[0116] A plurality of first electrodes (310) may be disposed between a plurality of first light-emitting elements (200a) and a substrate (100) and connected to the plurality of first light-emitting elements (200a). In other words, the plurality of first electrodes (310) may be connected to the second conductive semiconductor layer (230) of the plurality of first light-emitting elements (200a). The plurality of first electrodes (310) may be disposed to extend in one direction and be spaced apart from each other in the other direction, but the present invention is not limited thereto. In other words, the plurality of first electrodes (310) may be disposed to extend in the other direction and be spaced apart from each other in the one direction. Hereinafter, a description will be given focusing on a case where the plurality of first electrodes (310) extend in one direction and are spaced apart from each other in the other direction.

[0117] Each of the plurality of first electrodes (310) may be connected to some of the first light-emitting elements (200a) arranged in one direction among the plurality of first light-emitting elements (200a), but is not limited thereto. In other words, each of the plurality of first electrodes (310) may extend in the other direction and be spaced apart from each other in the one direction to be connected to some of the first light-emitting elements (200a) arranged in the other direction among the plurality of first light-emitting elements (200a). When viewed from above, at least some of the plurality of first electrodes (310), the plurality of second electrodes (320), and the plurality of third electrodes (330) may be arranged to intersect each other. For example, any one of the plurality of first electrodes (310) may intersect at least one of the plurality of second electrodes (320) and at least one of the plurality of third electrodes (330) when viewed from above. Therefore, when viewed from above, the area of ​​the electrode overlapping with the first light-emitting element (200a) can be minimized, thereby minimizing the absorption of light emitted from the first light-emitting element (200a) into the electrode.

[0118] Any one of the plurality of first electrodes (310) may be connected to any one of the plurality of first light-emitting elements (200a). Another one of the plurality of first electrodes (310) may be connected to another one of the plurality of first light-emitting elements (200a). Another one of the plurality of first electrodes (310) may be connected to another one of the plurality of first light-emitting elements (200a). For example, each of the plurality of first electrodes (310) may be connected to two or more first light-emitting elements (200a).

[0119] Meanwhile, although it has been described that the plurality of first electrodes (310) are positioned between the substrate (100) and the plurality of first light-emitting elements (200a), it is not limited thereto. In other words, the plurality of first electrodes (310) may be positioned between the plurality of first light-emitting elements (200a) and the plurality of second light-emitting elements (200b) and connected to the plurality of first light-emitting elements (200a).

[0120] The plurality of second electrodes (320) may be connected to the plurality of second light-emitting elements (200b). In other words, the plurality of second electrodes (320) may be connected to the second conductive semiconductor layer (230) of the plurality of second light-emitting elements (200b). The plurality of first light-emitting elements (200a) and the plurality of second light-emitting elements (200b) may be arranged between the plurality of first light-emitting elements (200a) and the plurality of second light-emitting elements (200b). In other words, the plurality of second electrodes (320) may be arranged above the plurality of first light-emitting elements (200a) and below the plurality of second light-emitting elements (200b). The plurality of second electrodes (320) may be arranged to extend in one direction and be spaced apart from each other in one direction, but are not limited thereto. In other words, the plurality of second electrodes (320) may be arranged to extend in one direction and be spaced apart from each other in the other direction. Hereinafter, a description will be given focusing on a plurality of second electrodes (320) extending in different directions and arranged spaced apart from each other in one direction.

[0121] Each of the plurality of second electrodes (320) may be connected to some of the second light-emitting elements (200b) that are arranged in the other direction among the plurality of second light-emitting elements (200b). In other words, any one of the plurality of second electrodes (320) may be connected to some of the plurality of second light-emitting elements (200b) that are arranged in the other direction. Another one of the plurality of second electrodes (320) may be connected to another one of the plurality of second light-emitting elements (200b) that are arranged in the other direction. Still another one of the plurality of second electrodes (320) may be connected to another one of the plurality of second light-emitting elements (200b) that are arranged in the other direction. For example, each of the plurality of second electrodes (320) may be connected to two or more second light-emitting elements (200b).

[0122] Meanwhile, although it has been described that the plurality of second electrodes (320) are positioned between the plurality of first light-emitting elements (200a) and the plurality of second light-emitting elements (200b), it is not limited thereto. In other words, the plurality of second electrodes (320) may be positioned between the plurality of second light-emitting elements (200b) and the plurality of third light-emitting elements (200c) and connected to the plurality of second light-emitting elements (200b).

[0123] A plurality of third electrodes (330) may be connected to a plurality of third light-emitting elements (200c). In other words, the plurality of third electrodes (330) may be connected to the second conductive semiconductor layer (230) of the plurality of third light-emitting elements (200c). The plurality of second light-emitting elements (200b) may be disposed between the plurality of third light-emitting elements (200c). In other words, the plurality of third electrodes (330) may be disposed above the plurality of second light-emitting elements (200b) and below the plurality of third light-emitting elements (200c). The plurality of third electrodes (330) may be disposed to extend in one direction and to be spaced apart from each other in one direction, but are not limited thereto. In other words, the plurality of third electrodes (330) may be disposed to extend in one direction and to be spaced apart from each other in the other direction. Hereinafter, a description will be given focusing on a plurality of third electrodes (330) extending in different directions and arranged spaced apart from each other in one direction.

[0124] Each of the plurality of third electrodes (330) may be connected to some of the third light-emitting elements (200c) that are arranged in the other direction among the plurality of third light-emitting elements (200c). In other words, any one of the plurality of third electrodes (330) may be connected to some of the plurality of third light-emitting elements (200c) that are arranged in the other direction. Another one of the plurality of third electrodes (330) may be connected to another one of the plurality of third light-emitting elements (200c) that are arranged in the other direction. Still another one of the plurality of third electrodes (330) may be connected to another one of the plurality of third light-emitting elements (200c) that are arranged in the other direction. For example, each of the plurality of third electrodes (330) may be connected to two or more third light-emitting elements (200c).

[0125] Meanwhile, although it has been described that the plurality of third electrodes (330) are positioned between the plurality of second light-emitting elements (200b) and the plurality of third light-emitting elements (200c), it is not limited thereto. In other words, the plurality of third electrodes (330) may be positioned above the plurality of third light-emitting elements (200c). In addition, the heights of at least some of the first electrode (310), the second electrode (320), and the third electrode (330) may be formed differently from each other.

[0126] A plurality of common electrodes (340) may be connected to a plurality of first light-emitting elements (200a), a plurality of second light-emitting elements (200b), and a plurality of third light-emitting elements (200c). In other words, the plurality of common electrodes (340) may be connected to the first conductive semiconductor layer (210) of each of the plurality of first light-emitting elements (200a), the plurality of second light-emitting elements (200b), and the plurality of third light-emitting elements (200c). The plurality of common electrodes (340) may be arranged to be spaced apart from each other in different directions. In addition, each of the plurality of common electrodes (340) may be connected to some of the first light-emitting elements (200a) arranged in one direction, some of the second light-emitting elements (200b) arranged in one direction, and some of the third light-emitting elements (200c) arranged in one direction. Each of these plurality of common electrodes (340) may include a first common electrode (341) and a plurality of second common electrodes (342).

[0127] The first common electrode (341) may be placed on the substrate (100) and may extend in one direction. In addition, the first common electrode (341) may be connected to a plurality of second common electrodes (342).

[0128] A plurality of second common electrodes (342) may be spaced apart from each other in one direction and may extend upward from the first common electrode (341). Each of the plurality of second common electrodes (342) may be connected to any one of the plurality of first light-emitting elements (200a), any one of the plurality of second light-emitting elements (200b), and any one of the plurality of third light-emitting elements (200c). Meanwhile, the second common electrode (342) may penetrate the first cover layer (510), the second cover layer (520), and the third cover layer (530) so as to be connected to the first light-emitting element (200a), the second light-emitting element (200b), and the third light-emitting element (200c). The second common electrode (342) may extend in the thickness direction along the side surfaces of the first light-emitting element (200a), the second light-emitting element (200b), and the third light-emitting element (200c). The second common electrode (342) may extend in a direction perpendicular to the plane of the substrate (100) to form a short path for the second common electrode (342), thereby reducing electrical resistance.

[0129] A first cover layer (510) may be disposed on a substrate (100) to cover a plurality of first light-emitting elements (200a) and a plurality of first electrodes (310). In other words, the first cover layer (510) may cover at least a portion of side surfaces and upper surfaces of the plurality of first light-emitting elements (200a). In addition, at least a portion of the first cover layer (510) may be disposed between the plurality of second electrodes (320) and the plurality of first light-emitting elements (200a) to space the plurality of second electrodes (320) from the plurality of first light-emitting elements (200a). In addition, the first cover layer (510) may support the plurality of second electrodes (320) and the plurality of second light-emitting elements (200b). Therefore, it is possible to prevent the plurality of second electrodes (320) from touching the substrate (100) in the area between the first light-emitting elements (200a).

[0130] The second cover layer (520) may be disposed on the upper side of the first cover layer (510) to cover the plurality of second light-emitting elements (200b) and the plurality of second electrodes (320). In other words, the second cover layer (520) may cover at least a portion of the side surfaces and the upper surfaces of the plurality of second light-emitting elements (200b). In addition, at least a portion of the second cover layer (520) may be disposed between the plurality of third electrodes (330) and the plurality of second light-emitting elements (200b) to space the plurality of third electrodes (330) from the plurality of second light-emitting elements (200b). The second cover layer (520) may support the plurality of third electrodes (330) and the plurality of third light-emitting elements (200c). Therefore, it is possible to prevent the third electrodes (330) from touching the substrate (100) in the area between the second light-emitting elements (200b).

[0131] The third cover layer (530) may be arranged on the upper side of the second cover layer (520) to cover a plurality of third light-emitting elements (200c) and a plurality of third electrodes (330). In other words, the third cover layer (530) may cover at least a portion of the side surfaces and upper surfaces of the plurality of third light-emitting elements (200c).

[0132] The first cover layer (510), the second cover layer (520), and the third cover layer (530) may be formed of the same material or may be formed of different materials. In addition, the heights of at least some of the first cover layer (510), the second cover layer (520), and the third cover layer (530) may be formed differently. For example, the heights of the first cover layer (510) and the second cover layer (520) may be formed differently.

[0133] Hereinafter, the operation and effect of the light emitting device (1) according to the third embodiment of the present invention will be described.

[0134] At least some of the light generated from the plurality of first light-emitting elements (200a), the plurality of second light-emitting elements (200b), and the plurality of third light-emitting elements (200c) can be emitted to the outside by transmitting through at least one of the first cover layer (510), the second cover layer (520), and the third cover layer (530).

[0135] These plurality of first light-emitting elements (200a), plurality of second light-emitting elements (200b), and plurality of third light-emitting elements (200c) can be individually driven.

[0136] A plurality of first electrodes (310), a plurality of second electrodes (320), and a plurality of third electrodes (330) are arranged to be spaced apart from each other vertically or horizontally, so that the circuit arrangement can be simplified and interference between the electrodes can be prevented.

[0137] Hereinafter, with reference to FIG. 16, a light emitting device (1) according to a fourth embodiment of the present invention will be described. In describing the fourth embodiment, there is a difference in that the arrangement of the first electrode (310), the second electrode (320), and the third electrode (330) may be formed differently from the above-described embodiment, and the description will focus on this difference.

[0138] A plurality of first electrodes (310) may be arranged on the substrate (100) and may be arranged spaced apart from each other in different directions. Any one of the plurality of first electrodes (310) may be connected to any one of the plurality of first light-emitting elements (200a). Another one of the plurality of first electrodes (310) may be connected to another one of the plurality of first light-emitting elements (200a). Still another one of the plurality of first electrodes (310) may be connected to still another one of the plurality of first light-emitting elements (200a). Each of the plurality of first electrodes (310) may include a first sub-electrode (311) and a second sub-electrode (312).

[0139] The first sub-electrode (311) may have a different polarity from the second sub-electrode (312). The first sub-electrode (311) may extend in one direction from the substrate (100) and be connected to some of the plurality of first light-emitting elements (200a). The first sub-electrode (311) and the second sub-electrode (312) may be arranged to face the lower surface of the first light-emitting element (200a). The first sub-electrode (311) may be electrically connected to either the first conductive semiconductor layer (210) or the second conductive semiconductor layer (230) of the first light-emitting element (200a).

[0140] The second sub-electrode (312) may be arranged in one direction on the substrate (100) and connected to some of the plurality of first light-emitting elements (200a). The second sub-electrode (312) may be arranged spaced apart from the first sub-electrode (311) in another direction. In addition, the second sub-electrode (312) may be electrically connected to the other of the first conductive semiconductor layer (210) and the second conductive semiconductor layer (230) of the first light-emitting element (200a).

[0141] The plurality of first light-emitting elements (200a) connected to the first electrodes (310) may be flip chips having a mesa formed thereon. In other words, the plurality of first light-emitting elements (200a) may be formed so that one surface of the first conductive semiconductor layer (210) is exposed, and may include at least one step and mesa region. In addition, the first light-emitting elements (200a) may be arranged such that the second conductive semiconductor layer (230) is closer to the substrate (100) than the first conductive semiconductor layer (210). Therefore, the second conductive semiconductor layer (230) of the first light-emitting element (200a) facing the substrate (100) may have a smaller area than the first conductive semiconductor layer (210).

[0142] A plurality of second electrodes (320) may be connected to a plurality of second light-emitting elements (200b). Any one of the plurality of second electrodes (320) may be connected to any one of the plurality of second light-emitting elements (200b). Another one of the plurality of second electrodes (320) may be connected to another one of the plurality of second light-emitting elements (200b). Still another one of the plurality of second electrodes (320) may be connected to still another one of the plurality of second light-emitting elements (200b). Each of the plurality of second electrodes (320) may include a third sub-electrode (321) and a fourth sub-electrode (322).

[0143] The third sub-electrode (321) may be arranged on the substrate (100) and connected to a plurality of second light-emitting elements (200b). The third sub-electrode (321) may include a third-first sub-electrode (321a) and a plurality of third-second sub-electrodes (321b).

[0144] The 3-1 sub-electrode (321a) can extend in one direction from the substrate (100). The 3-1 sub-electrode (321a) can support a plurality of 3-2 sub-electrodes (321b).

[0145] A plurality of 3-2 sub-electrodes (321b) may be spaced apart from each other in one direction and extend upward from the 3-1 sub-electrode (321a). Each of the plurality of 3-2 sub-electrodes (321b) may be connected to a different second light-emitting element (200b). The 3-2 sub-electrodes (321b) may be connected to either the first conductive semiconductor layer (210) or the second conductive semiconductor layer (230) of the second light-emitting element (200b). The plurality of 3-2 sub-electrodes (321b) may pass through the outer side of the mesa of the first light-emitting element (200a) and be connected to the second light-emitting element (200b). In other words, the plurality of 3-2 sub-electrodes (321b) may extend from the outer side of one light-emitting element. Since these multiple 3-2 sub-electrodes (321b) extend from the outside of the light-emitting element, the number of light-emitting elements through which the 3-2 sub-electrodes (321b) pass can be reduced, so that the number of electrodes passing through the steps and inclined surfaces of the light-emitting element can be minimized, and chip efficiency can be improved. As a result, a high current density can be supplied to the light-emitting device (1), so that the reliability of the multiple light-emitting elements (200) can be improved.

[0146] The fourth sub-electrode (322) may be spaced apart from the substrate (100) and connected to a plurality of second light-emitting elements (200b). The fourth sub-electrode (322) may include a 4-1 sub-electrode (322a) and a plurality of 4-2 sub-electrodes (322b).

[0147] The 4-1 sub-electrode (322a) may be positioned higher than the plurality of third light-emitting elements (200c) and may extend in other directions. The 4-1 sub-electrode (322a) may support the plurality of 4-2 sub-electrodes (322b).

[0148] A plurality of 4-2 sub-electrodes (322b) may extend downward from the 4-1 sub-electrode (322a) while being spaced apart from each other in different directions. Each of the plurality of 4-2 sub-electrodes (322b) may be connected to a different second light-emitting element (200b). The 4-2 sub-electrodes (322b) may be connected to the other of the first conductive semiconductor layer (210) and the second conductive semiconductor layer (230) of the second light-emitting element (200b). Since the plurality of 4-2 sub-electrodes (322b) and the plurality of 3-2 sub-electrodes (321b) may extend in different opposite directions, it is possible to prevent the electrodes from being crowded and complicated, and the efficiency of the electrode arrangement may be increased. In addition, the plurality of 4-2 sub-electrodes (322b) may extend from the outside of the mesa of the third light-emitting element (200c). In other words, since a plurality of 4-2 sub-electrodes (322b) extend from the outside of the light-emitting element, the number of light-emitting elements through which the 4-2 sub-electrodes (321b) pass can be reduced, so that the number of electrodes passing through the steps and inclined surfaces of the light-emitting elements can be minimized, and chip efficiency can be improved. As a result, a high current density can be supplied to the light-emitting device (1), so that the reliability of the plurality of light-emitting elements (200) can be improved.

[0149] A plurality of second light-emitting elements (200b) connected to the second electrode (320) may be etched to expose the first conductive semiconductor layer (210) and may include at least one step and mesa region. The second light-emitting element (200b) may be arranged such that the second conductive semiconductor layer (230) is closer to the substrate than the first conductive semiconductor layer (210), so that the area of ​​the second conductive semiconductor layer (230) of the second light-emitting element (200b) may be smaller than the area of ​​the upper surface of the first light-emitting element (200a). Alternatively, the first conductive semiconductor layer (210) of the second light-emitting element (200b) may be arranged closer to the substrate (100) than the second conductive semiconductor layer (230), so that the area of ​​one surface of the first conductive semiconductor layer (210) of the second light-emitting element (200b) may be larger than the area of ​​the upper surface of the first light-emitting element (200a). In addition, the height of the second light-emitting element (200b) may be formed to be larger than the heights of the first light-emitting element (200a) and the third light-emitting element (200c). Even if the third light-emitting element (200c) and a plurality of electrodes are arranged on the upper portion of the second light-emitting element (200b), the second light-emitting element (200b) may be prevented from being bent and the plurality of electrodes from being short-circuited. The height of the second light-emitting element (200b) may be 100 nm or more greater than the height of the first light-emitting element (200a).

[0150] Meanwhile, a bonding layer may be disposed between the first light-emitting element (200a) and the second light-emitting element (200b). The bonding layer may be disposed so as to extend between the plurality of first light-emitting elements (200a). Alternatively, a first filling material may be disposed between the plurality of first light-emitting elements (200a), a second filling material may be disposed between the plurality of second light-emitting elements (200b), and a bonding layer may be disposed between the first filling material and the second filling material so as to extend between the first light-emitting element (200a) and the second light-emitting element (200b).

[0151] A plurality of third electrodes (330) may be connected to a plurality of third light-emitting elements (200c). Any one of the plurality of third electrodes (330) may be connected to any one of the plurality of third light-emitting elements (200c). Another one of the plurality of second electrodes (320) may be connected to another one of the plurality of third light-emitting elements (200c). Another one of the plurality of third electrodes (330) may be connected to another one of the plurality of third light-emitting elements (200c). The plurality of third electrodes (330) may include a fifth sub-electrode (331) and a sixth sub-electrode (332).

[0152] The fifth sub-electrode (331) may have a different polarity from the sixth sub-electrode (332). The fifth sub-electrode (331) may extend in a different direction from the upper side of the plurality of third light-emitting elements (200c) and may be connected to some of the plurality of third light-emitting elements (200c). The fifth sub-electrode (331) and the sixth sub-electrode (332) may be arranged to face the upper surface of the third light-emitting element (200c). The fifth sub-electrode (331) may be electrically connected to either the first conductive semiconductor layer (210) or the second conductive semiconductor layer (230) of the third light-emitting element (200c).

[0153] The sixth sub-electrode (332) may extend in the other direction from the upper side of the plurality of third light-emitting elements (200c) and may be connected to some of the plurality of third light-emitting elements (200c). The sixth sub-electrode (332) may be arranged to be spaced apart from the fifth sub-electrode (331) in the other direction. In addition, the sixth sub-electrode (332) may be electrically connected to the other one of the first conductive semiconductor layer (210) and the second conductive semiconductor layer (230) of the third light-emitting element (200c).

[0154] A plurality of third light-emitting elements (200c) connected to the third electrode (330) may be etched so that one surface of the first conductive semiconductor layer (210) is exposed, and may include at least one step and mesa region. The third light-emitting element (200c) may be arranged such that the second conductive semiconductor layer (230) is closer to the substrate than the first conductive semiconductor layer (210). The area of ​​one surface of the second conductive semiconductor layer (230) of the third light-emitting element (200c) may be smaller than the area of ​​the upper surface of the opposing second light-emitting element (200b). Alternatively, the first conductive semiconductor layer (210) of the third light-emitting element (200c) may be arranged closer to the substrate (100) than the second conductive semiconductor layer (230), so that the area of ​​the first conductive semiconductor layer (210) of the third light-emitting element (200c) is larger than the area of ​​the upper surface of the second light-emitting element (200b) facing it.

[0155] At least one of the first light-emitting element (200a), the second light-emitting element (200b), and the third light-emitting element (200c) may include a mesa region, and may be arranged so that the direction in which the mesa region is formed is arranged in the same direction with respect to one surface of the first conductive semiconductor layer (210). Alternatively, at least one of the first light-emitting element (200a), the second light-emitting element (200b), and the third light-emitting element (200c) may be arranged so that the direction in which the mesa region is formed is different.

[0156] Hereinafter, the operation and effect of the light emitting device (1) according to the fourth embodiment of the present invention will be described.

[0157] Since the number of light-emitting elements passing through the second electrode (320) of the light-emitting device (1) according to the fourth embodiment of the present invention can be reduced, the number of electrodes passing through the steps and inclined surfaces of the light-emitting elements can be minimized, and chip efficiency can be improved. As a result, a high current density can be supplied to the light-emitting device (1), and the reliability of the plurality of light-emitting elements (200) can be improved.

[0158] Hereinafter, with reference to FIG. 17, a light emitting device (1) according to a fifth embodiment of the present invention will be described. In describing the fifth embodiment, there is a difference in the arrangement of the second electrode (320), and this difference will be mainly described.

[0159] According to the fifth embodiment of the present invention, at least one of the first light-emitting element (200a), the second light-emitting element (200b), and the third light-emitting element (200c) of the light-emitting device (1) may not include a mesa region. In other words, the plurality of second light-emitting elements (200b) may be formed in a vertical structure in which the positions where the first conductive semiconductor layer (210) and the second electrode (320) are connected and the positions where the second conductive semiconductor layer (230) and the second electrode (320) are connected are located in opposite directions. The difference in the upper area of ​​the first conductive semiconductor layer (210) and the second conductive semiconductor layer (230) of the second light-emitting element (200b) may be 0% or more and 10% or less. The outer surfaces of the first conductive semiconductor layer (210) and the second conductive semiconductor layer (230) of the second light-emitting element (200b) may be linearly connected.

[0160] A plurality of third-second sub-electrodes (321b) of the second electrode (320) may be positioned lower than the mesa side of the second light-emitting element (200b) and connected to the second light-emitting element (200b). Since the second electrode (320) may extend from the side of the first light-emitting element (200a), the number of steps through which the electrode passes may be reduced.

[0161] A plurality of 4-2 sub-electrodes (322b) of the second electrode (320) may be arranged above the mesa side of the second light-emitting element (200b) and connected to the second light-emitting element (200b). Since the plurality of 4-2 sub-electrodes (322b) may extend from the side of the third light-emitting element (200c), the number of steps through which the electrodes pass may be reduced.

[0162] Hereinafter, the operation and effect of the light emitting device (1) according to the fifth embodiment of the present invention will be described.

[0163] Since a plurality of third-second sub-electrodes (321b) can be arranged below the mesa side of the second light-emitting element (200b), the number of steps through which the electrodes pass can be reduced.

[0164] Since a plurality of 4-2 sub-electrodes (322b) can be arranged above the mesa side of the second light-emitting element (200b), the number of steps through which the electrodes pass can be reduced.

[0165] Although the embodiments of the present invention have been described as specific embodiments, these are merely examples, and the present invention is not limited thereto, but should be construed to have the broadest scope in accordance with the technical concepts disclosed in this specification. Those skilled in the art may combine / substitute the disclosed embodiments to implement patterns of shapes not specified, but this also does not depart from the scope of the present invention. In addition, those skilled in the art may easily modify or alter the disclosed embodiments based on this specification, and it is clear that such modifications or alterations also fall within the scope of the present invention.

Claims

1. Substrate; A plurality of light-emitting elements arranged on the upper surface of the substrate and generating light; A first electrode disposed between the substrate and the plurality of light-emitting elements and electrically connected to the plurality of light-emitting elements; and A second electrode is spaced apart from the substrate and electrically connected to a plurality of light-emitting devices, The first electrode and the second electrode are spaced apart from each other in the vertical direction by at least one light-emitting element among the plurality of light-emitting elements, and extend in an intersecting manner from the one light-emitting element when viewed from above. Light-emitting device.

2. In paragraph 1, The intersection point where the first electrode and the second electrode intersect is in the shape of a square or diamond. Light-emitting device.

3. In paragraph 1, The above first electrode extends in one direction and is connected to the plurality of light-emitting elements, The second electrode extends in a direction different from the one direction and is connected to the plurality of light-emitting elements, The length perpendicular to one direction of the first electrode is 70% or less of the length perpendicular to the one direction of the light emitting element, The length of the second electrode perpendicular to the other direction is 70% or less of the length of the one light emitting element perpendicular to the other direction. Light-emitting device.

4. In paragraph 1, The area of the upper surface of the above one light emitting element is, The above first electrode is 60% or more in area projected toward the above one light emitting element, Light-emitting device.

5. In paragraph 1, The first electrode and the second electrode are formed in plurality, Each of the above plurality of light-emitting elements, A first conductive semiconductor layer connected to the first electrode; An active layer laminated on the first conductive semiconductor layer; and A second conductive semiconductor layer connected to the second electrode is included, The above active layer is arranged above the center of the light emitting element, Light-emitting device.

6. In paragraph 5, Each of the above plurality of light-emitting elements, Further comprising an insulating layer covering the first conductive semiconductor layer, the active layer and the second conductive semiconductor layer, An insulating layer opening is formed in the above insulating layer, The plurality of second electrodes are electrically connected to the first conductive semiconductor layer, the active layer, or the second conductive semiconductor layer through the insulating layer opening. Light-emitting device.

7. In paragraph 6, When viewed from the top, the edge of the insulating layer opening is positioned inward from the edge of the second electrode. Light-emitting device.

8. In paragraph 6, The second electrode is electrically connected to one of the plurality of light-emitting elements and a light-emitting element adjacent to the one light-emitting element, A virtual line connecting the center of the insulating layer opening of the one light emitting element and the center of the insulating layer opening of the adjacent light emitting element is arranged so as to be offset from the side of the second electrode. Light-emitting device.

9. In paragraph 1, The lower surface of the above plurality of light-emitting elements has unevenness formed, Light-emitting device.

10. In paragraph 1, The above second electrode Bent downward so as to be positioned lower than the upper portion of the plurality of light-emitting elements among the plurality of light-emitting elements, Light-emitting device.

11. Substrate; A plurality of first light-emitting elements arranged on the substrate; A plurality of second light-emitting elements arranged above the plurality of first light-emitting elements; A plurality of third light-emitting elements arranged above the plurality of second light-emitting elements; A plurality of first electrodes disposed between the plurality of first light-emitting elements and the substrate and electrically connected to the plurality of first light-emitting elements; A plurality of second electrodes arranged between the plurality of first light-emitting elements and the plurality of second light-emitting elements and electrically connected to the plurality of second light-emitting devices; A plurality of third electrodes arranged between the plurality of second light-emitting elements and the plurality of third light-emitting elements and electrically connected to the plurality of light-emitting devices; and A plurality of first light-emitting elements, a plurality of second light-emitting elements, and a plurality of common electrodes electrically connected to the plurality of third light-emitting elements, Light-emitting device.

12. In paragraph 11, The plurality of first electrodes are arranged to intersect the plurality of second electrodes or the plurality of third electrodes when viewed from above. Light-emitting device.

13. In paragraph 11, The plurality of first electrodes extend in one direction and are arranged spaced apart from each other in a direction different from the one direction and connected to some of the plurality of first light-emitting elements, The plurality of second electrodes are spaced apart from each other in the one direction and extend in the other direction to be connected to some of the plurality of second light-emitting elements, The plurality of third electrodes are arranged to extend in the other direction and to be spaced apart from each other in the one direction. Light-emitting device.

14. In paragraph 13, The above plurality of first electrodes Extending in one direction and spaced apart from each other in the other direction, or extending in the other direction and spaced apart from each other in the one direction, and connected to some of the plurality of first light-emitting elements, Light-emitting device.

15. In paragraph 13, Each of the above plurality of common electrodes, a first common electrode disposed on the substrate and extending in the one direction; and A plurality of second common electrodes extending upward from the first common electrode and connected to any one of the plurality of first light-emitting elements, any one of the plurality of second light-emitting elements, and any one of the plurality of second light-emitting elements, Light-emitting device.

16. In paragraph 13, Some of the plurality of first light-emitting elements are arranged in the one direction and connected to any one of the plurality of first electrodes, Some of the plurality of second light-emitting elements are arranged in the one direction and are connected to different second electrodes among the plurality of second electrodes while being arranged in the one direction, Some of the plurality of third light-emitting elements are arranged in the one direction and connected to different third electrodes among the plurality of third electrodes. Light-emitting device.

17. In paragraph 16, Other portions of the plurality of first light-emitting elements are arranged in the other direction and connected to different first electrodes among the plurality of first electrodes, Other portions of the plurality of second light-emitting elements are arranged in the other direction and connected to one of the plurality of second electrodes, Other portions of the plurality of third light-emitting elements are arranged in the other direction and connected to one of the plurality of third electrodes, Light-emitting device.

18. In paragraph 11, A first cover layer covering the plurality of first light-emitting elements and the plurality of first electrodes; A second cover layer disposed above the first cover layer and covering the plurality of second light-emitting elements and the plurality of second electrodes; and A third cover layer is disposed above the second cover layer and covers the plurality of third light-emitting elements and the plurality of third electrodes, A portion of the first cover layer is disposed between the plurality of first light-emitting elements and the plurality of second electrodes, A portion of the second cover layer is disposed between the plurality of second light-emitting elements and the plurality of third electrodes. Light-emitting device.

19. Substrate; A plurality of light-emitting elements arranged on the upper surface of the substrate and emitting light; A plurality of first electrodes disposed between the substrate and the plurality of light-emitting elements, extending in one direction and spaced apart from each other in a direction different from the one direction and electrically connected to the plurality of light-emitting elements; A plurality of second electrodes spaced apart from the substrate, extending in the other direction and spaced apart from each other in the one direction and electrically connected to a plurality of light emitting devices; and A cover layer comprising the plurality of insulating layers, the plurality of first electrodes, and the plurality of second electrodes, Light-emitting device.

20. In paragraph 19, Further comprising an outer layer laminated on the above cover layer, Light-emitting device.

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