Light-emitting element and light-emitting device comprising same

Abstract

The present invention relates to a light-emitting element and a light-emitting device comprising same. The present invention relates to a light-emitting device (10) comprising: a substrate (100); and a plurality of light-emitting elements (200) disposed on the substrate (100). The light-emitting device (10) comprises at least one substrate common electrode (110) and a plurality of substrate individual electrodes (120) formed on the substrate (100), wherein N light-emitting elements (2001-2002) (N is a natural number of 2 or more) are commonly connected to the substrate common electrode (110) so as to form a light-emitting group (G).

Description

Light-emitting element and light-emitting device including the same

[0001] The present invention relates to a light-emitting element and a light-emitting device including the same.

[0002] As one of the light-emitting devices, a display device is a device that displays characters, symbols, images, or videos. The display device may include a plurality of light-emitting elements, and may display characters, symbols, images, or videos by controlling light emitted from the plurality of light-emitting elements.

[0003] The display device includes a display substrate such as a PCB substrate on which an electric circuit is arranged, and a plurality of light-emitting elements can be modularized and arranged on the display substrate.

[0004] Conventional display devices often have difficulty displaying text, symbols, images, or video content due to the failure of multiple light-emitting elements to be securely and reliably connected to the display substrate. Specifically, if a defect occurs, such as some of the light-emitting elements detaching from the display substrate, the area where the light-emitting elements are installed can become a dead pixel, degrading display quality.

[0005] The purpose of the present invention is to provide a light-emitting element and a light-emitting device including the same, which can improve the reliability of the light-emitting element due to heat generation problems by simplifying the circuit connection structure for a plurality of light-emitting elements and reducing electrical resistance.

[0006] A light emitting device (10) according to one embodiment of the present invention may include a substrate (100) and a plurality of light emitting elements (200) arranged on the substrate (100).

[0007] In one embodiment, the light emitting device (10) may include at least one substrate common electrode (110) and a plurality of substrate individual electrodes (120) formed on the substrate (100).

[0008] In one embodiment, N light emitting elements (2001 to 200 N ) (N is a natural number greater than or equal to 2) can be commonly connected to the substrate common electrode (110) to form a light-emitting group (G).

[0009] In one embodiment, the number of the substrate common electrodes (110) may be the same as the number of the light-emitting groups (G).

[0010] In one embodiment, each of the plurality of light-emitting elements (200) has K light-emitting parts (2101 to 210 K )(K is a natural number greater than or equal to 2).

[0011] The above K light emitting parts (2101~210 K ) and a common electrode (220) commonly connected to the K light-emitting parts (2101 to 210 K ) may include a plurality of individual electrodes (230) each connected to each other.

[0012] In one example, the number of light-emitting portions emitting light in a first light-emitting element among the plurality of light-emitting elements may be different from the number of light-emitting portions emitting light in at least one other light-emitting element among the plurality of light-emitting elements.

[0013] In one embodiment, N may be greater than or equal to K.

[0014] In one embodiment, the number of the plurality of individual electrodes (230) may be K.

[0015] In one embodiment, N may be greater than K and less than or equal to twice K.

[0016] In one embodiment, the K light emitting units (2101 to 210) K ) can emit light of the same peak wavelength.

[0017] In one embodiment, the characteristics of light emitted from a first light-emitting element among the plurality of light-emitting elements may be different from the characteristics of light emitted from at least one other light-emitting element among the plurality of light-emitting elements.

[0018] In one embodiment, when the same current is supplied to the first light-emitting element and the second light-emitting element among the plurality of light-emitting elements, the current density of the light-emitting part that emits light in the first light-emitting element may be different from the current density of the light-emitting part that emits light in the second light-emitting element.

[0019] In one embodiment, the K light emitting units (2101 to 210) K ) at least one of at least one other light emitting portion (2101-210 K ) can emit light with a different peak wavelength.

[0020] In one embodiment, the N light emitting elements (2001 to 200 N ) can be arranged to surround the substrate common electrode (110) with the substrate common electrode (110) as the center.

[0021] In one embodiment, the N light emitting elements (2001 to 200 N ) can be arranged with virtual extension lines (V) branching radially from the common electrode (110) of the substrate as the boundary.

[0022] In one embodiment, the N light emitting elements (2001 to 200 N ) have a polygonal shape on a plane, and the light-emitting element (2001~200) on a plane N ) The virtual line (IM) connecting the vertex located farthest from the substrate common electrode (110) can form a triangle, square, pentagon or hexagon.

[0023] In one embodiment, the light emitting element (2001-200) on the plane N) of the region formed by the virtual line (IM) connecting the side located farthest from the substrate common electrode (110) is at least part of the light emitting element (2001~200) of the adjacent light emitting group (G). N ) can be overlapped.

[0024] In one embodiment, each of the light emitting elements (200) has K light emitting parts (2101 to 210 K )(K is a natural number greater than or equal to 2) and the K light-emitting parts (2101~210 K ) may include a first common electrode (240) that is commonly connected to the electrodes.

[0025] In one embodiment, the light emitting portion (2101 to 210 K ) may be distributed and arranged at a distance from a point on the first common electrode (240) in a radial direction based on the point. The point may be the center point of the first common electrode.

[0026] In one embodiment, the light emitting unit (2101 to 210) K ) each have a shape with at least one vertex, and each light emitting part (2101~210 K ) can be arranged such that at least one of the vertices faces the point on the first common electrode.

[0027] In one embodiment, the light emitting part (2101 to 210) facing the point K ) can be arranged so that at least one vertex is spaced apart from each other.

[0028] In one embodiment, each of the light emitting elements (200) has K light emitting parts (2101 to 210 K )(K is a natural number greater than or equal to 2) and the K light-emitting parts (2101~210 K ) may be included.

[0029] In one embodiment, the light emitting unit (2101 to 210) K) each have a shape with at least one vertex, and each light emitting part (2101~210 K ) can be arranged so that at least one of the vertices points toward a point.

[0030] In one embodiment, the light emitting part (2101 to 210) facing the point K ) can be arranged so that at least one vertex is spaced apart from each other.

[0031] In one embodiment, the one point is the light emitting part (2101-210 K ) can be formed on an extension line connecting at least two vertices.

[0032] In one embodiment, the light emitting element (200) further includes a second common electrode (250) commonly connected to the K light emitting portions (2101 to 210K).

[0033] In one embodiment, the K light emitting units (2101 to 210) K ) can be connected in parallel between the first common electrode (240) and the second common electrode (250).

[0034] In one embodiment, S light emitting elements (2001 to 200 S ) can form one pixel (PX).

[0035] In one embodiment, the S light emitting elements (2001 to 200 S ) can emit light of a different peak wavelength from the other light-emitting elements.

[0036] In one embodiment, the pixels (PX) are provided in plurality, and at least one of the plurality of pixels (PX) includes a light emitting element (2001 to 200 S ) the intensity of light having the first peak wavelength emitted from the light emitting elements (2001~200) included in other pixels (PX) S ) may be different from the intensity of light having the first peak wavelength emitted from the light sources.

[0037] In one embodiment, the pixels (PX) are provided in plurality, and at least one of the plurality of pixels (PX) includes a light emitting element (2001 to 200 S ) emits light having a first peak wavelength (2101-210) K ) is the number of light-emitting elements (2001~200) included in other pixels (PX). S ) emits light having the first peak wavelength (2101 to 210) K ) may differ from the number of

[0038] The present invention can provide a light-emitting element and a light-emitting device including the same, which can simplify the circuit connection structure for a plurality of light-emitting elements and reduce electrical resistance, thereby improving the reliability of the light-emitting element due to heat generation problems.

[0039] The present invention can improve the movement of the light emitting center point according to differences in the area or number of light emitting portions of a plurality of light emitting elements, thereby providing a light emitting element having a uniform light emitting center point position and a light emitting device including the same.

[0040] FIG. 1a is a front view showing a light-emitting device according to one embodiment of the present invention.

[0041] Figure 1b is a modified example of Figure 1.

[0042] Fig. 2 is a plan view showing a light emitting device according to the first embodiment of the present invention.

[0043] Figure 3 is a plan view showing a light emitting device according to a second embodiment of the present invention.

[0044] Fig. 4 is a plan view showing a light emitting device according to a third embodiment of the present invention.

[0045] Fig. 5 is a plan view showing a light emitting device according to a fourth embodiment of the present invention.

[0046] Figure 6 is a plan view showing a display device according to one embodiment of the present invention.

[0047] Figure 7 is a plan view showing a display device according to another embodiment of the present invention.

[0048] Fig. 8 is a plan view showing a light emitting device according to a fifth embodiment of the present invention.

[0049] Fig. 9 is a plan view showing a light emitting device according to the sixth embodiment of the present invention.

[0050] FIGS. 10A to 10C are plan views showing light emitting devices according to the seventh to ninth embodiments of the present invention.

[0051] In the following description, for purposes of explanation, numerous specific details are set forth to provide a thorough understanding of various embodiments or implementations of the present disclosure. As used herein, the terms "embodiment" and "implementation" are interchangeable to refer to non-limiting examples of devices or methods that utilize one or more of the inventive concepts disclosed herein. However, it will be apparent that various embodiments may be practiced without utilizing these specific details or using one or more equivalent arrangements. In other instances, well-known structures and devices are shown in block diagram form to avoid unnecessarily obscuring the various embodiments. Furthermore, while the various embodiments may vary from one another, they are not necessarily exclusive. For example, specific features, configurations, and characteristics of an embodiment may be utilized or implemented in other embodiments without departing from the scope of the inventive concepts.

[0052] Unless otherwise specified, the illustrated embodiments should be understood to provide exemplary features of varying details of some ways in which the concepts of the present invention may be practically implemented. Therefore, unless otherwise specified, the features, components, modules, layers, membranes, panels, regions, and / or aspects (hereinafter, individually or collectively referred to as "elements") of the various embodiments may be differently combined, separated, interchanged, and / or rearranged without departing from the scope of the concepts of the present invention.

[0053] The use of cross-hatching and / or shading in the accompanying drawings is generally provided to clarify boundaries between adjacent elements. As such, the presence or absence of cross-hatching or shading, unless expressly stated, does not imply or indicate any preference or requirement for any particular material, material properties, dimensions, proportions, commonality between the illustrated elements, and / or any other features, properties, or characteristics of the elements. Furthermore, in the accompanying drawings, the dimensions and relative sizes of elements may be exaggerated for clarity and / or illustrative purposes. When embodiments are implemented differently, certain process sequences may be performed differently from the illustrated sequence. For example, two consecutively illustrated processes may be performed substantially simultaneously or in a reverse order from the illustrated sequence. Furthermore, like reference numerals designate like elements.

[0054] When an element, such as a layer, is referred to as being "on," "connected to," or "joined to" another element or layer, the element may be directly on, connected to, or joined to the other element or layer, or there may be intervening elements or layers present. However, when an element or layer is referred to as being "directly on," "directly connected to," or "directly joined to" another element or layer, there are no intervening elements or layers present. For this purpose, the term "connected" may refer to physical, electrical, and / or fluidic connections, with or without intervening elements. Furthermore, the DR1-axis, DR2-axis, and DR3-axis are not limited to the three axes of a Cartesian coordinate system, such as the x, y, and z-axes, and may be interpreted in a broader sense. For example, the DR1-axis, DR2-axis, and DR3-axis may be perpendicular to one another, or may represent different directions that are not perpendicular to one another. For purposes of this disclosure, “one or more of X, Y or Z” and “one or more selected from the group consisting of X, Y or Z” may be interpreted as only X, only Y, only Z or any combination of two or more of X, Y and Z, such as, for example, XYZ, XYY, YZ and ZZ. The term “and / or” as used herein includes any and all combinations of one or more of the associated listed items.

[0055] Although the terms "first," "second," and the like may be used herein to describe various types of elements, these elements should not be limited by these terms. These terms are used to distinguish one element from another. Therefore, the first element discussed below may be referred to as the second element without departing from the teachings of the present disclosure.

[0056] Spatially relative terms such as "beneath," "beneath," "directly beneath," "lower," "above," "upper," "above," "higher than," "side" (as in, for example, a "side wall"), and the like may be used for descriptive purposes and thereby to describe the relationship of one element to other element(s) as depicted in the drawings. Spatially relative terms are intended to encompass different orientations of the device in use, operation, and / or manufacture in addition to the orientations depicted in the drawings. For example, if the device in the drawings were turned over, an element described as "beneath" or "beneath" another element or feature would then be oriented "above" the other element or feature. Therefore, the exemplary term "beneath" can encompass both orientations above and below. Furthermore, the device can be oriented differently (e.g., rotated 90° or oriented in other orientations), and thus the spatially relative descriptors used herein can also be interpreted accordingly.

[0057] The terminology used herein is for the purpose of describing particular embodiments and is not limiting. The singular forms "a," "an," and "the" as used herein also include the plural forms unless the context clearly dictates otherwise. Furthermore, the terms "comprises," "comprising," "includes," and / or "comprising" as used herein specify the presence of stated features, integers, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. Furthermore, the terms "substantially," "about," and other similar terms as used herein are used as terms of approximation rather than degrees, and as such, are used to describe inherent deviations from measured, calculated, and / or provided values ​​that would be recognized by one of ordinary skill in the art.

[0058] Various embodiments are described below with reference to cross-sectional and / or exploded illustrations, which are schematic illustrations of idealized embodiments and / or intermediate structures. As such, variations from the shapes of the illustrated drawings may be expected, for example, as a result of manufacturing techniques and / or tolerances. Therefore, the embodiments disclosed herein should not necessarily be construed as limited to the shapes of specific illustrated regions, but should be construed to include, for example, deviations in shape resulting from manufacturing. In this way, the regions depicted in the drawings may be schematic in nature, and the shapes of these regions may not reflect the actual shapes of regions of the device, and as such, are not necessarily intended to have a limiting meaning.

[0059] As is conventional in the art, some embodiments may be illustrated and described in the accompanying drawings in terms of functional blocks, units, and / or modules. Those skilled in the art will appreciate that these blocks, units, and / or modules are physically implemented by electronic (or optical) circuits such as logic circuits, discrete components, microprocessors, wiring circuits, memory elements, and wiring connections formed using semiconductor-based or other manufacturing techniques. When the blocks, units, and / or modules are implemented by microprocessors or other similar hardware, they may be programmed and controlled using software (e.g., microcode) to perform the various functions discussed herein, and optionally, may be driven by firmware and / or software. Furthermore, each block, unit, and / or module may be implemented by dedicated hardware, or by a combination of dedicated hardware for performing some functions and processors (e.g., one or more programmed processors and associated circuitry) for performing other functions. Additionally, the blocks, units, and / or modules of some embodiments may be physically separated into two or more interacting and individual blocks, units, and / or modules without departing from the scope of the present invention. Additionally, the blocks, units, and / or modules of some embodiments may be physically combined into more complex blocks, units, and / or modules without departing from the scope of the present invention.

[0060] Unless otherwise defined, all terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. Terms defined in commonly used dictionaries, such as terms defined in commonly used dictionaries, should be interpreted to have a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealistic or overly formal sense unless explicitly defined herein.

[0061] The present invention discloses a light emitting device (10) including a substrate (100) and a plurality of light emitting elements (200) arranged on the substrate (100).

[0062] The above substrate (100) is a substrate on which a plurality of light-emitting elements (200) are mounted, and can have various configurations. The above substrate (100) is a substrate on which a light-emitting element (200) is mounted on the upper surface, and is not limited to a specific type as long as it can support the light-emitting element (200), such as a circuit board, a lead frame, a flexible substrate, a transparent substrate, etc.

[0063] For example, the substrate (100) may be composed of a PCB (Printed Circuit Board). The PCB may be, for example, an FR4 PCB having excellent properties such as high strength, flame retardancy, and chemical resistance. Alternatively, it may be a Metal PCB (Metal Printed Circuit Board) having excellent heat dissipation performance and good thermal conductivity. More specifically, it may be a PCB including Cu, Zn, Au, Ni, Al, Mg, Cd, Be, W, Mo, Si, and Fe or an alloy of at least one of these as a base metal. However, the present invention is not limited thereto, and various PCBs may be used depending on the product characteristics.

[0064] The above substrate (100) has an insulating layer and wiring for electrical connection with the light-emitting element (200), and may include circuits for supplying and driving an electrical source such as current or voltage to the light-emitting element (200).

[0065] An electrode pad for mounting a light-emitting element (200) may be formed on the upper surface of the substrate (100), and a pad for mounting on another substrate (e.g., a display substrate) may be formed on the lower surface of the substrate (100).

[0066] The above substrate (100) can be formed into a single-layer or multi-layer structure, and can be formed into various thicknesses as needed.

[0067] The above substrate (100) is a display substrate constituting a display device (1000) described later, or a display

[0068] A plurality of light-emitting elements (200) may be arranged on one surface of the substrate (100). The plurality of light-emitting elements (200) may be connected to an electric circuit of the substrate (100) by a conductive material or an adhesive material. For example, the plurality of light-emitting elements (200) may be connected to an electric circuit of the substrate (100) by soldering.

[0069] FIG. 1 is a front view of a light-emitting element (200) according to one embodiment of the present invention. Hereinafter, with reference to FIG. 1, the specific configuration of the light-emitting element (200) mounted on one surface of a substrate (100) will be described in detail.

[0070] The above light-emitting element (200) is configured to include a light-emitting diode that receives power from the outside and emits light, and various configurations are possible.

[0071] Specifically, the light emitting element (200) comprises a base (202) and K light emitting parts (2101 to 210) arranged on one surface of the base (202). K )(K is a natural number greater than or equal to 2) can be included.

[0072] The above base (202) has the K light emitting parts (2101 to 210 K ) as a support structure, and various configurations are possible.

[0073] In addition, the light emitting element (200) is supported by being coupled to the base (202), and the K light emitting parts (2101 to 210) K ) may include electrodes (220, 230) for electrical connection.

[0074] The above electrodes (220, 230) may be formed of a conductive material and may include at least one of Ti, W, Ni, Pd, Al, Au, Sn, Cu, Sr, PbO, PbSO4, or a superconducting material.

[0075] The above electrodes (220, 230) are A a B b (EO4) c X d It may include a chemical formula, and A: (s-, p-block metal) Ca, Ba, Sr, Sn, Pb, (lanthanide series, etc.) Y, La, Ce or a combination of at least one or more substances, B: (d-block metal) Cu, Cd, Zn, Mn, Fe, Ni, Ag or a combination of at least one or more substances, E: P, As, V, Si, B, S or a combination of at least one or more substances, X: F, Cl, OH, O, S, Se, Te or a combination of at least one or more substances (a: 0 to 10, b: 0 to 10, c: 0 to 6, d: 0 to 4).

[0076] The electrodes (220, 230) may include a ceramic compound or may include Lanarkite. The electrodes (230, 240, 250) may include any one of a region including Pb2SO5, a region including PbS, or a region including CuP.

[0077] The above electrodes (220, 230) are 10 -7It can have a resistance value of Ω·cm or less.

[0078] In addition, the light emitting element (200) comprises the K light emitting parts (2101 to 210 K ) may further include a molding portion (290) covering the molding portion. The molding portion (290) may be omitted as an optional configuration.

[0079] The above molding part (290) has the K light emitting parts (2101 to 210 K ) while protecting the K light emitting parts (2101 to 210 K ) can be composed of a member through which light emitted from the member is transmitted.

[0080] The above molding part (290) has the K light emitting parts (2101 to 210 K ) can cover the upper surface (204) of the base (202) and can cover at least a part of the electrode (220, 230).

[0081] The above molding part (290) has the K light emitting parts (2101 to 210 K ) can be encapsulated and can also function as a refractive layer that refracts light emitted therefrom.

[0082] The above molding part (290) may be composed of a single layer or multiple layers, and the light emitting part (2101 to 210 K ) may be a transparent molding having light transmission properties to transmit light emitted from the mold.

[0083] Meanwhile, the molding part (290) may be formed of a resin including one or more of, for example, acrylate, silicone, epoxy, PMMA (Polymethyl methacrylate), and PS (Polystyrene) series, but is not limited thereto. In addition, the molding part (290) may include a light-emitting part (2101 to 210 K ) can be formed of a fluororesin to improve the light extraction efficiency emitted from the substrate.

[0084] Additionally, the molding portion (290) may be a light-transmitting layer formed of a material that allows light to pass through. The light transmittance of the molding portion (290) may be 50% or more, preferably 70% or more. In this case, the light blocking rate of the molding portion (290) may be 40% or less.

[0085] As another example, the molding portion (290) may further include a light-reflecting material or a light-absorbing material. In this case, the molding portion (290) may be an opaque layer and may include a black pigment to adjust the contrast of the display. Furthermore, the molding portion (290) may also include a matrix containing a light-scattering material, such as silica.

[0086] As another example, the molding portion (290) can perform both a light-blocking function and a light-reflecting function. For example, the molding portion (290) can be formed using a carbon black molding agent or a molding agent combining black and white.

[0087] As another example, the molding portion (290) may further include a light-absorbing function in addition to its light-reflecting function. For example, the molding portion (290) may be formed of a white molding agent or a molding agent combining white and black. Accordingly, the contrast of the light emitted through the molding portion (290) can be adjusted, and the brightness of the display can be improved.

[0088] As another example, the molding part (290) has a light emitting part (2101-210 K ) may further include a light diffusing material capable of diffusing light emitted from the molding member (400). For example, the light diffusing material may include one or more of TiO2, BaO, SiO2, and MgO, Y2O3 capable of scattering light, and this may be distributed inside the molding member (400).

[0089] The thickness of the above molding part (290) can be configured in various ways.

[0090] The above K light emitting parts (2101~210 K ) is a light emitting diode that emits light when powered, and can be configured in various ways. FIG. 1 illustrates an example in which the light emitting element (200) includes three light emitting parts (210_1, 210_2, 210_3) (i.e., K=3), but the present invention is not limited thereto.

[0091] Each light emitting part (2101~210 K ) is a light-emitting structure grown on one side of a growth substrate, and may include a first conductive semiconductor layer, an active layer, and a second conductive semiconductor layer.

[0092] The growth substrate is a substrate on which a semiconductor layer is to be placed, and is not limited to a substrate on which a nitride-based semiconductor can be placed. For example, the growth substrate may include a heterogeneous substrate such as a sapphire substrate, a gallium arsenide substrate, a silicon substrate, a silicon carbide substrate, or a spinel substrate, and may also include a homogeneous substrate such as a gallium nitride substrate or an aluminum nitride substrate.

[0093] The first conductive semiconductor layer is a semiconductor layer disposed on one surface of a growth substrate, and a buffer layer may be additionally disposed between the first conductive semiconductor layer and the growth substrate. The buffer layer may include a nitride or phosphide semiconductor such as GaN or GaAs, and may be grown using MOCVD.

[0094] The above buffer layer can improve the crystallinity of semiconductor layers placed on a growth substrate in a subsequent process, and can also serve as a seed layer on which nitride semiconductor layers can be grown on a heterogeneous substrate.

[0095] The first conductive semiconductor layer may include a phosphide or nitride semiconductor such as (Al, Ga, In)P or (Al, Ga, In)N, and may be arranged on a growth substrate using a method such as MOCVD, MBE, or HVPE. In addition, the first conductive semiconductor layer may be doped to be n-type by including one or more impurities such as Si, C, Ge, Sn, Te, or Pb. However, the present invention is not limited thereto, and the first conductive semiconductor layer may also be doped to be of the opposite conductive type by including a p-type dopant.

[0096] Furthermore, the first conductive semiconductor layer may be formed as a single layer or multiple layers. For example, the first conductive semiconductor layer may be formed of a first sub-conductive semiconductor layer and a second sub-conductive semiconductor layer on top of the first sub-conductive semiconductor layer.

[0097] The first sub-conductivity semiconductor layer and the second sub-conductivity semiconductor layer may be doped at different concentrations and formed at different process temperatures. When the first conductive semiconductor layer is formed of multiple layers, the first conductive semiconductor layer may include a superlattice layer.

[0098] Furthermore, the first conductive semiconductor layer may additionally include a contact layer, a modulation doping layer, an electron injection layer, etc.

[0099] The above active layer is a light-emitting layer formed on top of the first conductive semiconductor layer, and may include a phosphide or nitride semiconductor such as (Al, Ga, In)P or (Al, Ga, In)N, and may be grown on the first conductive semiconductor layer using a technique such as MOCVD, MBE, or HVPE.

[0100] Additionally, the active layer may include a quantum well structure (QW) including at least two barrier layers and at least one well layer, and further, may include a multiple quantum well structure (MQW) including a plurality of barrier layers and a plurality of well layers.

[0101] The wavelength of light emitted from the above active layer can be controlled by controlling the composition ratio of the materials constituting the well layer. In this case, the well layer may commonly contain the same element and may include In.

[0102] The above well layer is located between the barrier layers, and the band gap energy of the well layer may be smaller than the band gap energy of the barrier layer. The above well layer is In x Ga (1-x) N or In x Ga (1-x) P (0<x<1) can be included or formed by this, and the wavelength of the light emitted can be controlled depending on the composition ratio (x) of In.

[0103] The above barrier layers and well layers are alternately laminated, and it is preferable that they are alternately laminated at least twice. Adjacent barrier layers and well layers can form a pair.

[0104] The second conductive semiconductor layer may be a semiconductor layer formed on an active layer. The second conductive semiconductor layer may include a phosphide-based or nitride-based semiconductor such as (Al, Ga, In)P or (Al, Ga, In)N, and may be grown using a technique such as MOCVD, MBE, or HVPE. The second conductive semiconductor layer may be doped with a conductive type opposite to that of the first conductive semiconductor layer. For example, the second conductive semiconductor layer (126) may be doped to be p-type by including an impurity such as Mg.

[0105] The second conductive semiconductor layer may be formed as a single layer having a composition similar to p-GaN, but is not limited thereto, and may further include an AlGaN layer therein.

[0106] In addition, the above light emitting part (2101~210 K ) may be configured to include an insulating layer covering the first conductive semiconductor layer and the second conductive semiconductor layer and forming an opening in which the first and second electrode pads are arranged. The first and second electrode pads may be an N-type electrode pad and a P-type electrode pad, respectively.

[0107] The first and second electrode pads can be electrically connected to the first conductive semiconductor layer and the second conductive semiconductor layer, respectively, through the openings in the insulating layer.

[0108] The above-mentioned light emitting part (2101~210 K ) can be implemented by transforming into various structures, and it is obvious that it can be transformed into various structures such as flip-chip type, vertical type, and horizontal type.

[0109] For example, the K light emitting parts (2101 to 210 K ) can all emit light of the same peak wavelength. As another example, the K light-emitting units (2101 to 210 K ) at least one of the other light emitting parts (2101-210 K ) can emit light of a different peak wavelength. For example, the K light-emitting units (2101 to 210 K ) can all emit light with different peak wavelengths. In other words, the K light-emitting parts (2101 to 210 K ) can all emit light of the same color. Alternatively, the K light-emitting portions (2101 to 210 K ) at least one of the other light emitting parts (2101-210 K ) can emit light of a different color. For example, the K light-emitting units (2101 to 210) K ) can all emit light of different colors.

[0110] Specifically, the K light-emitting units (2101 to 210 K ) may be a blue light-emitting diode having a peak wavelength within a blue wavelength range, as a diode emitting blue light (B), and the blue light-emitting diode may have a difference between a peak wavelength and a dominant wavelength of 2 nm to 15 nm. Specifically, the blue light-emitting diode may have a peak wavelength of 430 nm to 475 nm, and a dominant wavelength of 460 nm to 480 nm. The peak wavelength of the blue light-emitting diode may be a shorter wavelength than the dominant wavelength.

[0111] As another example, the K light emitting parts (2101 to 210 K ) may be a green light-emitting diode having a peak wavelength within the green wavelength range, as a diode emitting green light (G), and the green light-emitting diode may have a difference between the peak wavelength and the dominant wavelength of 5 to 20 nm. Specifically, the green light-emitting diode may have a peak wavelength of 510 nm to 540 nm, and may have a dominant wavelength of 525 nm to 545 nm. The peak wavelength of the green light-emitting diode may be a shorter wavelength than the dominant wavelength.

[0112] As another example, the K light emitting parts (2101 to 210 K ) may be a red light emitting diode having a peak wavelength within a red wavelength range, as a diode emitting red light (R), and the red light emitting diode may have a difference between a peak wavelength and a dominant wavelength of 5 to 30 nm. Specifically, the red light emitting diode may have a peak wavelength of 620 nm to 640 nm and a dominant wavelength of 600 nm to 630 nm. The peak wavelength of the red light emitting diode may be a wavelength longer than the dominant wavelength.

[0113] The above K light emitting parts (2101~210K ) each emitting blue light, green light, and red light, can form one pixel (PX) that displays the RGB primary colors.

[0114] When the above light-emitting element (200) includes three first to third light-emitting units (210_1, 210_2, 210_3), the first light-emitting unit (210_1) can emit red light, which is light having the longest peak wavelength, the second light-emitting unit (210_2) can emit green light, which is light having a shorter peak wavelength than the first light-emitting unit (210_1), and the third light-emitting unit (210_3) can emit blue light, which is light having the shortest peak wavelength. The first light-emitting unit (210_1) emitting light having the longest peak wavelength may have a top surface height higher than the top surfaces of the other second light-emitting units (210_2) and third light-emitting units (210_3). That is, the vertical length of the first light-emitting portion (210_1) may be longer than the vertical lengths of the second light-emitting portion (210_2) and the third light-emitting portion (210_3).

[0115] The above light emitting part (2101~210 K ) may have a thickness of 250 μm or less, which may be a thickness including the first conductive semiconductor layer, the active layer, the second conductive semiconductor layer, and the growth substrate.

[0116] The above K light emitting parts (2101~210 K ) can be arranged horizontally and side by side as shown in Fig. 1, but is not limited thereto. That is, the K light-emitting units (2101 to 210 K ) may be a stacked light emitting diode arranged vertically stacked as shown in Fig. 2.

[0117] Meanwhile, the above K light emitting parts (2101~210 K ) can be connected to electrodes (220, 230) and receive power from a power source. At this time, the electrodes (220, 230) may be provided in multiple numbers.

[0118] For example, the electrodes (220, 230) are the K light-emitting parts (2101 to 210 K ) and a common electrode (220) commonly connected to the K light-emitting parts (2101 to 210 K ) may include a plurality of individual electrodes (230) each connected to each other.

[0119] The above light emitting element (200) has K light emitting parts (2101 to 210 K ), the electrodes (220, 230) may include one or more common electrodes (220) and K individual electrodes (230). That is, the number of the plurality of individual electrodes (230) is the number of light-emitting parts (2101 to 210 K ) may be equal to the number K. For example, if the light-emitting element (200) includes three light-emitting parts (210_1, 210_2, 210_3), the electrodes (220, 230) may be provided in total as four, including one common electrode (220) and three individual electrodes (230).

[0120] Meanwhile, the light emitting element (200) may have a polygonal shape on a plane. For example, the light emitting element (200) may be configured in a shape having vertices that form acute or obtuse angles, such as a square, rectangle, rhombus, pentagon, hexagon, or diamond on a plane. Light may be concentrated at a vertex that forms an acute angle among the vertices of the light emitting element (200), thereby allowing the light to be emitted further.

[0121] As illustrated in FIG. 2, the light emitting device (10) may include a plurality of light emitting elements (200) arranged on a substrate (100).

[0122] Among the above plurality of light emitting elements (200), N light emitting elements (2001 to 200) N ) (N is a natural number greater than or equal to 2) can form a light-emitting group (G). The light-emitting device (10) can include a plurality of light-emitting groups (G).

[0123] At this time, the light emitting device (10) may include at least one substrate common electrode (110) and a plurality of substrate individual electrodes (120) formed on the substrate (100).

[0124] The substrate common electrode (110) may be an electrode commonly connected to a plurality of light-emitting elements (200). For example, the substrate common electrode (110) may be commonly connected to a first conductive semiconductor layer of the plurality of light-emitting elements (200). As another example, the substrate common electrode (110) may be commonly connected to a second conductive semiconductor layer of the plurality of light-emitting elements (200).

[0125] The above substrate individual electrode (120) may be an electrode that is connected to each individual light-emitting element (200). When the substrate common electrode (110) is connected to the first conductive semiconductor layer of the light-emitting element (200), the substrate individual electrode (120) may be connected to the second conductive semiconductor layer of the light-emitting element (200). When the substrate common electrode (110) is connected to the second conductive semiconductor layer of the light-emitting element (200), the substrate individual electrode (120) may be connected to the first conductive semiconductor layer of the light-emitting element (200).

[0126] The above N light emitting elements (2001~200 N ) is connected to the substrate common electrode (110) through the common electrode (220) and can be connected to each substrate individual electrode (120) through each individual electrode (230).

[0127] For example, when three light-emitting elements (200_1, 200_2, 200_3) form one light-emitting group (G), and each light-emitting element (200_1, 200_2, 200_3) includes three light-emitting units (210_1, 210_2, 210_3) (in this case, a total of nine light-emitting units (210) are included in one light-emitting group (G), a common electrode (220) commonly connected to the three light-emitting units (210_1, 210_2, 210_3) and the first conductive semiconductor layer may be connected to the substrate common electrode (110), and individual electrodes (230) connected to the second conductive semiconductor layer of the light-emitting units (210_1, 210_2, 210_3) may be each connected to the substrate individual electrode (120). Conversely, it is also possible to connect the common electrode (220) commonly connected to the three light-emitting units (210_1, 210_2, 210_3) and the second conductive semiconductor layer to the substrate common electrode (110), and connect the individual electrodes (230) connected to the first conductive semiconductor layer of the light-emitting units (210_1, 210_2, 210_3) to the individual substrate electrodes (120), respectively. Accordingly, by applying power to the substrate common electrode (110) and the individual substrate electrode (120), each light-emitting element (200) and each light-emitting unit (210) belonging to one light-emitting group (G) can be independently driven.

[0128] When the number of light-emitting elements (200) constituting one light-emitting group (G) is N, the substrate common electrode (110) may be provided in a number of one or more, and the substrate individual electrodes (120) may be provided in a number of 2*N or more. When the number of light-emitting parts (210) included in the light-emitting element (200) is K, the substrate individual electrodes (120) may be provided in a number of K*N or more.

[0129] The above substrate common electrode (110) is arranged one by one for each light-emitting group (G), and the number of the above substrate common electrodes (110) may be the same as the number of the above light-emitting groups (G), but the present invention is not limited thereto.

[0130] The number of light emitting elements (200) connected to one substrate common electrode (110) can be configured in various ways. For example, the number of light emitting elements (200) connected to one substrate common electrode (110) can be greater than or equal to the number of individual electrodes (230) included in one light emitting element (200).

[0131] The upper area of ​​the substrate common electrode (110) may be larger than the area of ​​at least one substrate individual electrode (120). Accordingly, a plurality of light-emitting elements (2001 to 200) may be formed on one substrate common electrode (110). N ) can reduce heat generation by reducing the increase in resistance even when they are electrically connected.

[0132] When one light-emitting group (G) is provided with one substrate common electrode (110), the number N of light-emitting elements (200) constituting one light-emitting group (G) may be greater than or equal to the number K of light-emitting portions (210) (or the number of individual electrodes (230)) included in one light-emitting element (200). Alternatively, the number N of light-emitting elements (200) constituting one light-emitting group (G) may be greater than the number K of light-emitting portions (210) (or the number of individual electrodes (230)) included in one light-emitting element (200) and less than 2*K.

[0133] Through this, the circuit for driving the light emitting part (210) of each light emitting element (200) can be simplified, thereby preventing short circuits due to interference between circuits and preventing resistance from increasing.

[0134] The above light-emitting group (G) may be provided in multiple numbers, and the substrate common electrode (110) may be provided in a number corresponding to the number of light-emitting groups (G). The substrate common electrode (110) may be spaced apart on the substrate (100) and arranged in various patterns such as a grid or honeycomb.

[0135] The substrate common electrode (110) and the substrate individual electrode (120) constituting one light-emitting group (G) can be formed in various sizes and shapes and arranged in various forms.

[0136] For example, the N light-emitting elements (2001~200) that constitute one light-emitting group (G) N ) may be arranged to surround the substrate common electrode (110) with the substrate common electrode (110) as the center. Accordingly, the plurality of substrate individual electrodes (120) may be arranged along the periphery with the substrate common electrode (110) as the center.

[0137] As the above substrate common electrode (110) is located in the center, each light emitting element (2001 to 200 N ) can be arranged so as to face the center, that is, the center of the substrate common electrode (110). In this case, the light emitting element (2001~200 N ) has a step due to the mesa structure, the common electrodes (220) are arranged to gather at the center of the substrate common electrode (110), so that the light emitting elements (2001~200) N ) can alleviate deviation due to height difference (provide stability against height difference) and prevent the targeting angle from being distorted.

[0138] Also, referring to FIG. 2, when forming virtual extension lines (V) radially branched from the center point of the substrate common electrode (110), N light-emitting elements (2001 to 200) constituting one light-emitting group (G) N ) can be placed between two extension lines, with each line as the boundary.

[0139] The number of the above extension lines is the number of the above light emitting elements (2001~200 N ) is equal to the number N, and assuming virtual extension lines (V) that are equally branched radially from the substrate common electrode (110), the central angles (Θ1, Θ2, Θ3) between the extension lines (V) can be equal to 360° / N.

[0140] At this time, N light-emitting elements (2001~200) forming one light-emitting group (G) N) can be arranged with virtual extension lines (V) branched radially and equally from the common electrode (110) of the substrate as the boundary.

[0141] However, in the present invention, the central angles (Θ1, Θ2, Θ3) of the extension line (V) are not limited to the case of equal branching, and as an example, the light emitting element (2001~200 N ) is 3, the central angles (Θ1, Θ2, Θ3) between neighboring extension lines (V) can be in the range of 110 to 130°.

[0142] Meanwhile, the central angle (Θ1, Θ2, Θ3) between the neighboring extension lines (V) is the center point of the substrate common electrode (110) and the light emitting element (2001~200) facing each other. N ) can be greater than the angle of the vertex of the light emitting element (2001~200 N ) can be placed appropriately spaced apart and sufficient space can be secured for installation.

[0143] The above N light emitting elements (2001~200 N ) may have a polygonal shape on a plane, and for example, may have a rectangular shape on a plane as shown in FIG. 2.

[0144] At this time, the light emitting element (2001~200) on the plane N ) of the vertices, the virtual line (IM) connecting the vertex located farthest from the substrate common electrode (110) may form a triangle, a square, or a pentagon. For example, as illustrated in FIG. 2, the virtual line (IM) may form a triangle.

[0145] The present invention relates to the light emitting device (2001~200) N ) can be arranged to adjust the pattern shape and light spread shape when lit.

[0146] For example, the light emitting element (2001~200) as shown in Fig. 2 N) can be arranged to implement a non-circular shape of a lighting pattern or light spread. Light-emitting elements (2001~200 N ) can be formed into a shape having at least one vertex, for example, an N-gon, a rhombus, a trapezoid, etc. Light-emitting element (2001~200 N ) can be arranged so that at least one vertex of each of them points toward one center.

[0147] Meanwhile, although not shown, the light-emitting device (10) may further include a conductive material connecting the electrodes (110, 120) of the substrate (100) and the light-emitting element (200). The conductive material may be positioned between the electrodes (110, 120) and the light-emitting element (200).

[0148] The area of ​​the lower surface of the conductive material in contact with the upper surface of the substrate common electrode (110) may be larger than the area of ​​the lower surface of the conductive material in contact with the upper surface of at least one substrate individual electrode (120). Through this, the connection between the electrodes (110, 120) of the substrate (100) and the light-emitting element (200) may be strengthened.

[0149] In the above light emitting device (10), at least one of the plurality of light emitting elements (200) is a light emitting element (2001 to 200) that is turned on N ) Light-emitting elements (200) that light up in different numbers of light-emitting elements (2001~200) N) may be different from the number of light emitting elements (200). Or, at least one of the plurality of light emitting elements (200) in the light emitting device (10) may have light characteristics different from the light characteristics emitted from other light emitting elements (200). The light characteristics may be any one of a beam angle, a beam pattern, a light emission pattern, a light emission intensity, or a spectrum. At least one of the plurality of light emitting elements (200) in the light emitting device (10) may be turned on in a state where any one of the other light emitting elements (200) cannot be turned on. Therefore, even if one of the light emitting elements (200) has difficulty turning on, a normal display can be implemented without separate rework.

[0150] However, the purpose and effect of the present invention are not limited thereto, and the present invention can increase or decrease the brightness value of at least one of a plurality of light-emitting elements (200) in a situation where a clearer display implementation is required.

[0151] Meanwhile, at least one IC driver (800) can be electrically connected to the substrate (100) and can control the on / off and brightness adjustment of the light emitting elements (200). The light emitting device (10) can further include a sensor (900) that is arranged on the substrate (100) and detects the brightness of each color of the light emitting elements (200). The sensor (900) can detect the brightness and provide a signal to the IC driver (800) to supplement the brightness of the light emitting elements (200).

[0152] Next, Fig. 3 is a plan view showing a light emitting device (10) according to another embodiment. The same or similar configuration as the light emitting device (10) of Fig. 2 will not be described in detail, and differences from the light emitting device (10) of Fig. 2 will be described in detail.

[0153] FIG. 3 illustrates a case where four light-emitting elements (200_1, 200_2, 200_3, 200_4) constitute one light-emitting group (G). In FIG. 3, a plurality of light-emitting elements (200) may be arranged in a matrix form. The spacing between adjacent light-emitting elements (200_1, 200_2, 200_3, 200_4) within one light-emitting group (G) may be smaller than the spacing between adjacent light-emitting elements (200_1, 200_2, 200_3, 200_4) within different adjacent light-emitting groups (G).

[0154] Next, Fig. 4 is a plan view showing a light emitting device (10) according to another embodiment. The same or similar configuration as the light emitting device (10) of Figs. 2 and 3 will not be described in duplicate, and differences from the light emitting device (10) of Figs. 2 and 3 will be described in detail.

[0155] FIG. 4 shows a case where five light-emitting elements (200_1, 200_2, 200_3, 200_4, 200_5) form one light-emitting group (G). Referring to FIG. 4, the light-emitting elements (200_1, 200_2, 200_3, 200_4, 200_5) may have a rhombus or diamond shape on a plane, and at this time, an imaginary line (IM) connecting the vertex that is located farthest from the substrate common electrode (110) among the vertices of the light-emitting elements (200_1, 200_2, 200_3, 200_4, 200_5) on a plane may form a pentagon.

[0156] The present invention relates to the light emitting device (2001~200) N ) can be arranged to adjust the pattern shape and light spread shape when lit.

[0157] For example, the light emitting element (2001~200) as shown in Fig. 4 N ) can be arranged to create a lighting pattern shape or a light spread shape similar to a pentagon rather than a circle.

[0158] Next, Fig. 5 is a plan view showing a light emitting device (10) according to another embodiment. The same or similar configuration as the light emitting device (10) of Figs. 2, 3, and 4 will not be described in duplicate, and differences from the light emitting device (10) of Figs. 2, 3, and 4 will be described in detail.

[0159] FIG. 5 is a case where six light-emitting elements (200_1, 200_2, 200_3, 200_4, 200_5, 200_6) form one light-emitting group (G). Referring to FIG. 5, the light-emitting elements (200_1, 200_2, 200_3, 200_4, 200_5, 200_6) may have a hexagonal shape on a plane, and at this time, an imaginary line (IM) connecting the vertex that is located farthest from the substrate common electrode (110) among the vertices of the light-emitting elements (200_1, 200_2, 200_3, 200_4, 200_5) on a plane may form a hexagon.

[0160] The present invention relates to the light emitting device (2001~200) N ) can be arranged to adjust the pattern shape and light spread shape when lit.

[0161] For example, the light emitting element (2001~200) as shown in Fig. 5 N ) can be arranged to create a lighting pattern shape or a light spread shape similar to a hexagon rather than a circle.

[0162] In addition, a virtual line (IM) connecting the side of the light-emitting elements (200_1, 200_2, 200_3, 200_4, 200_5) on the plane that is located farthest from the substrate common electrode (110) can form a hexagonal shape.

[0163] At this time, at least some of the hexagonal shaped areas formed by the above virtual line (IM) are light emitting elements (2001~200) of adjacent other light emitting groups (G). N) can overlap with at least a portion of the light emitting element (2001~200) to form an overlapping region (OL). Through this, the light emitting element (2001~200 N ) can be grouped and placed at high density.

[0164] Meanwhile, Fig. 6 is a plan view showing a display device (1000) to which a light-emitting device (10) according to the present invention is applied. The display device (1000) may include a display panel and may be applied to signage or display devices, vehicles, etc.

[0165] The above display device (1000) may include a circuit board (1010), a plurality of pixels (PX) arranged on the circuit board (1010), and a buffer layer (1020).

[0166] The circuit board (1010) may be a panel board and may include circuits for passive matrix driving or active matrix driving. In one embodiment, the circuit board (1010) may include wiring and resistors therein. In another embodiment, the circuit board (1010) may include wiring, transistors, and capacitors. The circuit board (1010) may also have pads arranged on its upper surface to allow electrical connection to circuits arranged therein.

[0167] The above-described plurality of pixels (PX) may be aligned on a circuit board (1010). The pixel (PX) may be a small light-emitting device (10) having a size in micrometer units. The first direction width (W1) of the pixel (PX) may have a size of 1000 μm or less. In one embodiment, the spacing (W2) between adjacent pixels (PX) in the first direction in which the pixels (PX) are aligned may be wider than the width (W1) of the pixels (PX) in the first direction. Alternatively, in another embodiment, for pixel control, the spacing (W2) between pixels (PX) in the first direction in which the pixels (PX) are aligned may be arranged to be narrower than the width (W1) of the pixels (PX) in the first direction. Each pixel (PX) may include a plurality of light-emitting elements (200). For example, the pixel (PX) may include blue, green, and red sub-pixels.

[0168] The buffer layer (1020) may cover the circuit board (1010) between the pixels (PX) and may cover the upper surfaces of the pixels (PX). The buffer layer (1020) may also include a matrix that is transparent to light, but the present invention is not limited thereto.

[0169] For example, the buffer layer (1020) may reflect or absorb light, and for this purpose, a matrix having light-reflecting properties or a matrix having light-absorbing properties may be used. Alternatively, the buffer layer (1020) may contain a light-absorbing material such as carbon black or a light-scattering material such as silica within the matrix.

[0170] In addition, referring to FIG. 7, the light emitting device (10) according to the present invention can be applied to a VR display device such as a smart watch (1000a), a VR headset (1000b), an AR display device such as augmented reality glasses (1000c), or a display device such as signage. Or, it can be applied to a display of a vehicle (1000d) and configured to implement icons such as strings (English, numbers, Korean, etc.) or pictures. The display device can be networked with an external source to implement characters or icons specified by a user. The external source can be an application or a system setting installed in a vehicle.

[0171] Next, FIGS. 8 to 10 are plan views showing a light emitting device (10) according to further embodiments of the present invention, which can configure a pixel (PX) of the display device (1000) of FIG. 6 or FIG. 7.

[0172] Specifically, the light emitting device (10) may include a substrate (100) and a plurality of light emitting elements (200) arranged on the substrate (100). At this time, the light emitting element (200) may include K light emitting parts (2101 to 210 K )(K is a natural number greater than or equal to 2) and the K light-emitting parts (2101~210 K ) may include a first common electrode (240) that is commonly connected to the electrodes.

[0173] The above K light emitting parts (2101~210 K ) can be configured identically or similarly to the configuration described in FIGS. 1 to 5, so a detailed description thereof is omitted.

[0174] The above light emitting device (10) has S light emitting elements (2001 to 200 S ) may include S light emitting elements (2001~200 S) can form one pixel (PX). For example, referring to FIG. 8, the light emitting device (10) can form one pixel (PX) by including three light emitting elements (200_1, 200_2 200_3). The horizontal or vertical length of one pixel (PX) can be 10um or less. Alternatively, the area of ​​one pixel (PX) can be 100um2 or less.

[0175] Here, the S light emitting elements (2001~200 S ) can emit light of different peak wavelengths. The S light-emitting elements (2001 to 200 S ) at least one of the light emitting elements emitting red light (2001~200 S ) may be a sub-pixel of red light. The S light-emitting elements (2001 to 200 S ) at least one of the light-emitting elements emitting blue light (2001~200 S ) may be a sub-pixel of blue light. The S light-emitting elements (2001 to 200 S ) at least one of the light emitting elements (20001~200) emitting green light S ) can be a sub-pixel of green light.

[0176] Each light emitting element (2001~200 S ) contains K light-emitting parts (2101~210) K ) can correspond to light-emitting cells. Each light-emitting element (2001~200) constituting a sub-pixel S ) includes K light-emitting cells, the possibility that each sub-pixel will contain a defect is reduced, and reliability can be increased even when a high current is supplied to the light-emitting cells. The XRD rocking curve 102 value of at least one light-emitting cell may be 110° or less. At this time, the light-emitting cells may have various shapes such as a horizontal light-emitting diode, a flip-type light-emitting diode, or a vertical light-emitting diode, and are not limited to a specific structure.

[0177] Each light emitting element (2001~200) which is the above sub-pixel S ) is a plurality of light-emitting cells, with K light-emitting parts (2101~210 K ), wherein the plurality of light-emitting cells can be distinguished by a distinction area.

[0178] The above-mentioned separation region can be formed in such a way that the substrate supporting the light-emitting cells is exposed, or in such a way that some regions of the semiconductor layer constituting the light-emitting cells are separated and arranged and some regions of the semiconductor layer are arranged between the light-emitting cells.

[0179] The above-mentioned separation region may be 50 nm or more. The side surfaces of the light-emitting cells facing each other by the above-mentioned separation region may have an incline. The side surfaces of the facing light-emitting cells are formed at an incline of 50° or more with respect to the upper surface of the substrate, thereby improving light extraction efficiency.

[0180] The light emitting element (200), that is, the light emitting part (2101 to 210) included in the sub-pixel K ) may be 2 or more. That is, the number of light-emitting cells included in the sub-pixel may be 2 or more. The light-emitting cells may be arranged in a matrix form with rows and columns, or may be arranged in a row side by side.

[0181] The length of the above light-emitting cells may be less than the length of the subpixel divided by the number of cells. The maximum length of one side included in the light-emitting cells may be 5 um or less. Alternatively, the area of ​​one light-emitting cell may be 50 um2 or less.

[0182] The above first common electrode (240) is connected to the K light-emitting parts (2101 to 210 K ) as electrodes commonly connected to the light-emitting part (2101~210 K ) can be connected to the first conductive semiconductor layer or the second conductive semiconductor layer.

[0183] At this time, the number of the first common electrodes (240) may be the same as the number (S) of the light emitting elements (200). Referring to FIGS. 8 and 9, the first common electrodes (240) may be individually provided for each light emitting element (200), so that three, which is the same as the number of light emitting elements (200), may be provided. Alternatively, the number of the first common electrodes (240) may be less than the number (S) of the light emitting elements (200). That is, at least one of the first common electrodes (240) may be shared by adjacent light emitting elements (200). Referring to FIGS. 10A to 10C, it can be seen that at least some of the first common electrodes (240) are shared by adjacent light emitting elements (200), so that the number is less than the total number of light emitting elements (200).

[0184] At this time, the light emitting element (200) may further include a second common electrode (250). The first common electrode (250) may be a light emitting part (2101 to 210 K ) is connected to the first conductive semiconductor layer, the second common electrode (250) may be connected to the second conductive semiconductor layer. Conversely, the first common electrode (250) may be connected to the light emitting portion (2101 to 210 K ) is connected to the second conductive semiconductor layer, the second common electrode (250) can be connected to the first conductive semiconductor layer.

[0185] For example, the second common electrode (250) is the K light emitting parts (2101 to 210 K ) may further include a second common electrode (250) that is commonly connected to the K light-emitting units (2101 to 210). Referring to FIGS. 8 and 9, the second common electrode (250) may be connected to the K light-emitting units (2101 to 210 K ) as electrodes commonly connected to the light-emitting part (2101~210 K ) can be connected to the first conductive semiconductor layer or the second conductive semiconductor layer. Accordingly, the K light-emitting parts (2101 to 210 K) can be connected in parallel between the first common electrode (240) and the second common electrode (250).

[0186] Specifically, in FIG. 8, each light-emitting element (200_1, 200_2, 200_3) includes four light-emitting cells, i.e., four light-emitting units (210_1, 210_2, 210_3, 210_4), which can be arranged in a square matrix form (2x2). At this time, the first common electrode (240) is provided in the same number as the light-emitting elements (200_1, 200_2, 200_3), and each is arranged in the central area of ​​the four light-emitting units (210_1, 210_2, 210_3, 210_4) so ​​that it can be shared with the four light-emitting units (210_1, 210_2, 210_3, 210_4). The second common electrode (250) is provided in the same number as the light-emitting elements (200_1, 200_2, 200_3), and each may be a circular electrode that sequentially connects to the four light-emitting elements (210_1, 210_2, 210_3, 210_4). The circular electrode may have a square ring shape or a circular ring shape, but is not limited to a specific shape. The second common electrode (250) may be arranged to surround the first common electrode (240) on the outside of the first common electrode (240).

[0187] In Fig. 8, K light-emitting cells included in one sub-pixel (light-emitting element (200)) are connected in parallel between the first and second common electrodes (240, 250), so that even if one light-emitting cell is not lit, normal lighting can occur in other light-emitting cells without being affected by it.

[0188] The optical characteristics of at least one sub-pixel (light-emitting element (200)) may be different from the optical characteristics of other sub-pixels (light-emitting elements (200)). The optical characteristics may be any one of a beam angle, a beam pattern, a light emission pattern, a light emission intensity, or a spectrum. The electrical signal supplied to each of the K light-emitting cells that light up in the at least one sub-pixel (light-emitting element (200)) may be different from the value of the electrical signal supplied to each of the K light-emitting cells that light up in the other sub-pixel (light-emitting element (200)) compared to the electrical signal supplied to the at least one other sub-pixel (light-emitting element (200)). The electrical signal may be current, voltage, power, or resistance.

[0189] Referring again to FIG. 8, the number of light-emitting parts (210_1, 210_2, 210_3, 210_4) that are lit in at least one of the three light-emitting elements (200_1, 200_2, 200_3) may be different from the number of light-emitting parts (210_1, 210_2, 210_3, 210_4) that are lit in the other light-emitting elements (200_1, 200_2, 200_3).

[0190] Meanwhile, the above pixels (PX) may be provided in multiple numbers. When power is applied to the light emitting device (10), the light emitting element (2001 to 200) included in at least one of the plurality of pixels (PX) S ) the intensity of light having the first peak wavelength emitted from the light emitting elements (2001~200) included in other pixels (PX) S ) may be different from the intensity of light having the first peak wavelength emitted from the light sources.

[0191] In addition, when power is applied to the light emitting device (100), the light emitting element (2001 to 200) included in at least one of the plurality of pixels (PX) S ) emits light having a first peak wavelength (2101-210)K ) is the number of light-emitting elements (2001~200) included in other pixels (PX). S ) emits light having the first peak wavelength (2101 to 210) K ) may differ from the number of

[0192] In addition, when power is applied to the light emitting device (100), the light emitting element (2001 to 200) included in at least one of the plurality of pixels (PX) S ) emits light having a first peak wavelength (2101-210) K ) is applied to the light emitting element (2001~200) included in another pixel (PX). S ) emits light having the first peak wavelength (2101 to 210) K ) may be different from the driving voltage applied to the device.

[0193] In one embodiment, each of the light emitting elements (200) has K light emitting parts (2101 to 210 K )(K is a natural number greater than or equal to 2) and the K light-emitting parts (2101~210 K ) may be included.

[0194] In one embodiment, the light emitting unit (2101 to 210) K ) each have a shape with at least one vertex, and each light emitting part (2101~210 K ) can be arranged so that at least one of the vertices points toward a point.

[0195] In one embodiment, the light emitting part (2101 to 210) facing the point K ) can be arranged so that at least one vertex is spaced apart from each other.

[0196] In one embodiment, the one point is the light emitting part (2101-210 K ) can be formed on an extension line connecting at least two vertices.

[0197] Fig. 9 is a modified example of the light emitting device (10) of Fig. 8, and explains the differences from the light emitting device (10) of Fig. 8. The light emitting device (10) illustrates an embodiment in which a light emitting element (200_1, 200_2, 200_3), which is one sub-pixel, includes nine light emitting cells, i.e., light emitting portions (210_1, 210_2, 210_3, 210_4, 210_5, 210_6, 210_7, 210_8, 210_9). The maximum length of one side of each light emitting cell may be 3 um or less.

[0198] The above light-emitting cells (210_1, 210_2, 210_3, 210_4, 210_5, 210_6, 210_7, 210_8, 210_9) may be arranged in a 3x3 matrix form, and may thus include one central light-emitting cell (210_5) arranged at the center. The remaining light-emitting cells (210_1, 210_2, 210_3, 210_4, 210_6, 210_7, 210_8, 210_9) may be peripheral light-emitting cells surrounding the central light-emitting cell (210_5). Each light-emitting cell (210_1, 210_2, 210_3, 210_4, 210_5, 210_6, 210_7, 210_8, 210_9) can be distinguished by a distinction area.

[0199] At this time, the number of the first common electrodes (240) may be the same as the number (S) of the light-emitting elements (200). Referring to Fig. 9, the first common electrodes (240) may be individually provided for each light-emitting element (200), so that three, which is the same as the number of light-emitting elements (200), may be provided.

[0200] At this time, the light emitting element (200) may further include a second common electrode (250). The first common electrode (250) may be a light emitting part (2101 to 210 K ) is connected to the first conductive semiconductor layer, the second common electrode (250) may be connected to the second conductive semiconductor layer. Conversely, the first common electrode (250) may be connected to the light emitting portion (2101 to 210 K) is connected to the second conductive semiconductor layer, the second common electrode (250) can be connected to the first conductive semiconductor layer.

[0201] Referring to FIG. 9, the second common electrode (250) is an electrode commonly connected to nine light-emitting parts (210_1, 210_2, 210_3, 210_4, 210_5, 210_6, 210_7, 210_8, 210_9) included in one light-emitting element (200), and can be connected to the first conductive semiconductor layer or the second conductive semiconductor layer of the light-emitting parts (210_1, 210_2, 210_3, 210_4, 210_5, 210_6, 210_7, 210_8, 210_9). Accordingly, the nine light emitting parts (210_1, 210_2, 210_3, 210_4, 210_5, 210_6, 210_7, 210_8, 210_9) can be connected in parallel between the first common electrode (240) and the second common electrode (250).

[0202] Specifically, in FIG. 9, each light-emitting element (200_1, 200_2, 200_3) includes nine light-emitting cells, i.e., nine light-emitting units (210_1, 210_2, 210_3, 210_4, 210_5, 210_6, 210_7, 210_8, 210_9), which can be arranged in a 3x3 matrix form. At this time, the first common electrode (240) is provided in the same number as the light-emitting elements (200_1, 200_2, 200_3), and each can be shared with nine light-emitting units (210_1, ..., 210_9). The above second common electrode (250) is provided in the same number as the light emitting elements (200_1, 200_2, 200_3), and each can be shared with nine light emitting units (210_1, ..., 210_9).

[0203] The above first common electrode (240) and the above second common electrode (250) may be circular electrodes that are sequentially connected while passing through the nine light-emitting parts (210_1, ..., 210_9).

[0204] Specifically, the central light-emitting cell and the peripheral light-emitting cells can be electrically connected to each other by the first common electrode (240) and the second common electrode (250).

[0205] The first common electrode (240) may include a first circulation electrode passing through the peripheral light-emitting cells and a first connection electrode connecting across the first circulation electrode and passing through the central light-emitting cell.

[0206] The second common electrode (250) may include a second circulation electrode passing through the peripheral light-emitting cells and a second connection electrode connecting across the second circulation electrode and passing through the central light-emitting cell.

[0207] The second circulation electrode may be arranged on the outside of the first circulation electrode. The first and second connection electrodes may be spaced apart from each other vertically and may cross vertically above the central light-emitting cell. The second connection electrode may cross above the first connection electrode. The first and second circulation electrodes may have a square ring shape or a circular ring shape, but are not limited to a specific shape.

[0208] In Fig. 9, K light-emitting cells included in one sub-pixel (light-emitting element (200)) are connected in parallel between the first and second common electrodes (240, 250), so that even if one light-emitting cell is not lit, normal lighting can be achieved in other light-emitting cells without being affected by it.

[0209] Meanwhile, the present invention is not limited to the light emitting elements (200) constituting one pixel (PX) emitting light of different colors or light of different peak wavelengths, and each light emitting unit (210) constituting the light emitting element (200) may emit light of different colors. Alternatively, each light emitting element (200) may be configured by vertically stacking light emitting structures that emit light of different peak wavelengths. That is, an example in which each light emitting element (200) is vertically stacked and includes K light emitting units (210) that each emit red light, green light, and blue light is also possible.

[0210] In addition, FIGS. 8 and 9 illustrate an example in which K light-emitting cells (light-emitting units (210)) included in one sub-pixel (light-emitting element (200)) are connected in parallel by the first and second common electrodes (240, 250), but, unlike this, as illustrated in FIGS. 10a to 10c, at least some of the first and second common electrodes (240, 250) may be shared with other light-emitting elements (200). Hereinafter, the embodiments of FIGS. 10a to 10b will be described in detail, focusing on the differences from FIGS. 8 and 9.

[0211] FIG. 10a is a modified example of the light emitting device (10) of FIGS. 8 and 9, in which four light emitting elements (200_1, 200_2, 200_3, 200_4), which are sub-pixels, each include three light emitting cells, that is, three light emitting parts (210_1, 210_2, 210_3), and the light emitting parts (210_1, 210_2, 210_3) can be arranged in a vertical stack.

[0212] In the case of Fig. 10a, since at least some of the first common electrodes (240) are shared by adjacent light-emitting elements (200), the number of the first common electrodes (240) may be less than the total number of light-emitting elements (200). That is, in Fig. 10a, the total number of light-emitting elements (200) is four, whereas since the first common electrode (240) is shared by all light-emitting elements (200), the first common electrode (240) may be provided as one.

[0213] Additionally, in the case of FIG. 10a, at least some of the second common electrodes (250) may be shared by the light-emitting parts (210_1, 210_2, 210_3) of other sub-pixels (light-emitting elements (200)).

[0214] Specifically, referring to FIG. 10A, the first common electrode (240) is an electrode that is commonly connected to the first conductive semiconductor layer or the second conductive semiconductor layer of the light-emitting parts (210_1, 210_2, 210_3), and is shared by all light-emitting elements (200), so it is provided as a single electrode and may be a central electrode positioned in the center. That is, unlike FIGS. 8 and 9, the first common electrode (240) is not provided for each light-emitting element (200), but may be an electrode that is shared for other light-emitting elements (200).

[0215] In addition, in FIG. 10a, the second common electrode (250) is provided in multiple numbers and may be a common electrode shared by light emitting parts (210_1, 210_2, 210_3) of other sub-pixels (light emitting parts (200)), rather than a common electrode connecting light emitting parts (210) in one light emitting element (200).

[0216] That is, the second common electrode (250) may be a common electrode connecting light emitting parts (210) that emit light of the same peak wavelength or the same color among the light emitting parts (210) in the light emitting device (10). That is, one of the second common electrodes (250) may be a common electrode connecting light emitting parts (210) that emit red light among all light emitting parts (210) in the light emitting device (10), another of the second common electrodes (250) may be a common electrode connecting light emitting parts (210) that emit green light among all light emitting parts (210) in the light emitting device (10), and still another of the second common electrodes (250) may be a common electrode connecting light emitting parts (210) that emit blue light among all light emitting parts (210) in the light emitting device (10).

[0217] The above second common electrode (250) may be a square or circular ring-shaped electrode for electrically connecting the light-emitting parts (210), but is not limited to a specific shape.

[0218] FIG. 10b is a modified example of FIG. 10a, and may be configured identically or similarly to FIG. 10a, except that the light emitting device (10) includes nine light emitting elements (200) arranged in a 3x3 matrix form.

[0219] FIG. 10c is a modified example of FIGS. 10a and 10b, and may be configured identically or similarly to FIGS. 10a and 10b, except that the light emitting device (10) includes nine light emitting elements (200) arranged in a 4x4 matrix form and a plurality of first common electrodes (240) are provided.

[0220] The above first common electrode (240) may be shared with adjacent light-emitting elements (200). The plurality of first common electrodes (240) may be arranged along the central region and edges of the substrate (100).

[0221] The above second common electrode (250) may also be provided in multiple numbers, and unlike FIGS. 10a and b, one common electrode (250) may not connect all the light emitting units (210) that emit light of the same peak wavelength or color within the light emitting device (10), but may connect some of all the light emitting units (210) that emit light of the same peak wavelength or color within the light emitting device (10). The remaining light emitting units (210) may be connected by other second common electrodes (250). That is, some of the light emitting units (210) that emit light of the same peak wavelength or color may be connected to other second common electrodes (250).

[0222] A plurality of light emitting units (210) included in the light emitting device (10) of the present invention can be electrically connected by a first common electrode (240) and a second common electrode (250). At this time, the plurality of light emitting units (210) can be connected in parallel. Therefore, even if one light emitting unit (210) is not lit, other light emitting units (210) can be lit without being affected by it. In addition, even if one light emitting unit (210) is not lit, other light emitting units (210) can emit the corresponding color, so that the color change rate for non-lighting can be reduced.

[0223]

[0224] Although the present invention has been described above with reference to preferred embodiments thereof, it will be understood by those skilled in the art or having ordinary knowledge in the art that various modifications and changes to the present invention can be made without departing from the spirit and technical scope of the present invention as set forth in the claims to be described below.

[0225] Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the patent claims.

Claims

1. A light emitting device (10) including a substrate (100) and a plurality of light emitting elements (200) arranged on the substrate (100), It includes at least one substrate common electrode (110) and a plurality of substrate individual electrodes (120) formed on the substrate (100), N light emitting elements (2001~200 N ) (N is a natural number greater than or equal to 2) is a light emitting device (10) that is commonly connected to the substrate common electrode (110) to form a light emitting group (G).

2. In claim 1, The number of the above substrate common electrodes (110) is the same as the number of the above light-emitting groups (G) in the light-emitting device (10).

3. In claim 1, The above light emitting element (200) has K light emitting parts (2101 to 210 K )(K is a natural number greater than or equal to 2) and the K light-emitting parts (2101~210 K ) and a common electrode (220) commonly connected to the K light-emitting parts (2101 to 210 K ) A light emitting device (10) including a plurality of individual electrodes (230) each connected to one another.

4. In claim 3, The above N is a light emitting device (10) greater than or equal to the above K.

5. In claim 3, A light emitting device (10) in which the number of the above-mentioned plurality of individual electrodes (230) is K.

6. In claim 3, The above N is a light emitting device (10) that is greater than the above K and less than or equal to twice the above K.

7. In claim 3, The above K light emitting parts (2101~210 K ) is a light emitting device (10) that emits light of the same peak wavelength.

8. In claim 3, The above K light emitting parts (2101~210 K ) at least one of the other light emitting parts (2101-210 K ) A light emitting device (10) that emits light of a different peak wavelength.

9. In claim 1, The above N light emitting elements (2001~200 N ) are arranged to surround the substrate common electrode (110) with the substrate common electrode (110) as the center.

10. In claim 1, The above N light emitting elements (2001~200 N ) are light emitting devices (10) arranged with virtual extension lines (V) branching radially from the common electrode (110) of the substrate as the center.

11. In claim 9, The above N light emitting elements (2001~200 N ) have a polygonal shape on a plane, The light emitting element on the plane (2001~200 N ) A light emitting device (10) in which a virtual line (IM) connecting the vertex located farthest from the substrate common electrode (110) forms a triangle, square, pentagon or hexagon.

12. In claim 9, The above N light emitting elements (2001~200 N ) have a polygonal shape on a plane, The light emitting element on the plane (2001~200 N ) of the region formed by the virtual line (IM) connecting the side located farthest from the substrate common electrode (110) is at least part of the light emitting element (2001~200) of the adjacent light emitting group (G). N ) and a light-emitting device (10) overlapping with the light-emitting device.

13. A light emitting device (10) including a substrate (100) and a plurality of light emitting elements (200) arranged on the substrate (100), The above light emitting element (200) has K light emitting parts (2101 to 210 K )(K is a natural number greater than or equal to 2) and the K light-emitting parts (2101~210 K ) A light emitting device (10) including a first common electrode (240) commonly connected to the plurality of electrodes.

14. In claim 13, The above K light emitting parts (2101~210 K ) further includes a second common electrode (250) that is commonly connected to the The above K light emitting parts (2101~210 K ) are light emitting devices (10) connected in parallel between the first common electrode (240) and the second common electrode (250).

15. In claim 13, S light emitting elements (2001~200 S ) light emitting device (10) that forms one pixel (PX).

16. In claim 15, The above S light emitting elements (2001~200 S ) are light emitting devices (10) that emit light of different peak wavelengths.

17. In claim 16, The above pixels (PX) are provided in multiples, A light emitting element (2001 to 200) included in at least one of the plurality of pixels (PX) S ) the intensity of light having the first peak wavelength emitted from the light emitting elements (2001~200) included in other pixels (PX) S ) and a light emitting device (10) having a different intensity of light having a first peak wavelength emitted from the light sources.

18. In claim 16, The above pixels (PX) are provided in multiples, A light emitting element (2001 to 200) included in at least one of the plurality of pixels (PX) S ) emits light having a first peak wavelength (2101-210) K ) is the number of light-emitting elements (2001~200) included in other pixels (PX). S ) emits light having the first peak wavelength (2101 to 210) K ) and a different number of light emitting devices (10).

19. As a light emitting element (200) of a light emitting device (10) according to claim 13, The above light emitting element (200) has K light emitting parts (2101 to 210 K )(K is a natural number greater than or equal to 2) and the K light-emitting parts (2101~210 K ) A light emitting element (200) including a first common electrode (240) commonly connected to the elements.

20. In claim 19, The above K light emitting parts (2101~210 K ) further includes a second common electrode (250) that is commonly connected to the The above K light emitting parts (2101~210 K ) are light emitting elements (200) connected in parallel between the first common electrode (240) and the second common electrode (250).

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