Light-emitting device

Abstract

According to an embodiment, provided may be a light-emitting device comprising: a light-emitting unit; and a substrate on which the light-emitting unit is disposed, wherein the light-emitting unit generates light such that a main lighting direction faces the horizontal direction parallel to the substrate. According to another embodiment, provided may be a light-emitting device comprising: a light-emitting unit; and a substrate on which the light-emitting unit is disposed, wherein heat formed in the light-emitting unit is diffused in a second direction parallel to the substrate and emitted in a third direction perpendicular to the substrate, and the second direction is perpendicular to the third direction.

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 (LEDs) increases, they are being applied to a wide range of fields, including display devices, lighting equipment, vehicle lamps, and ships. However, demand for LEDs with improved light and heat emission efficiency is increasing, depending on the intended use.

[0004] One embodiment of the present invention can generate light that can be used to eliminate harmful organisms by efficiently reflecting light.

[0005] One embodiment of the present invention can provide a light-emitting device that can effectively reflect light to induce an avoidance response in marine life, thereby preventing marine life from sticking to a ship.

[0006] An embodiment of the present invention can provide a light-emitting device capable of attracting insects by efficiently reflecting light and inducing the inflow of insects.

[0007] An embodiment of the present invention can provide a light-emitting device capable of efficiently emitting light by increasing light extraction efficiency.

[0008] An embodiment of the present invention can provide a light-emitting device that efficiently releases heat, thereby increasing heat dissipation efficiency and improving reliability.

[0009] In addition, embodiments of the present invention can provide a light-emitting device with improved brightness by controlling the refraction direction.

[0010] According to one aspect of the present invention, a light-emitting device may be provided, comprising: a light-emitting unit; and a substrate on which the light-emitting unit is arranged, wherein the light-emitting unit generates light such that a main beam direction is directed in a horizontal direction parallel to the substrate.

[0011] Alternatively, a light-emitting device may be provided in which the light-emitting unit includes a plurality of light-emitting elements, and the plurality of light-emitting elements include a first light-emitting element that emits visible light; and a second light-emitting element that emits ultraviolet light.

[0012] Alternatively, the light emitting unit may be provided with a light emitting device in which the first light emitting element is disposed at the center of the substrate and the second light emitting element is disposed in a direction opposite to a side of the first light emitting element.

[0013] Alternatively, a light-emitting device may be provided in which the first light-emitting element is arranged to generate the light in a first direction parallel to the substrate, and the second light-emitting element is arranged to generate the light in a second direction parallel to the substrate and perpendicular to the first direction.

[0014] Alternatively, a light emitting device may be provided in which the second light emitting element is positioned to face a side of the first light emitting element.

[0015] Alternatively, a light emitting device may be provided in which the light emitting unit includes a substrate and a terminal electrically connecting the substrate and the substrate.

[0016] Alternatively, a light emitting device may be provided in which the light emitting portion further includes a second frame on which the substrate is arranged, and the terminal has a shape that surrounds one edge of the substrate and one edge of the second frame.

[0017] Alternatively, a light-emitting device may be provided, wherein the light-emitting unit includes a light-emitting element; a device substrate on which the light-emitting element is arranged; and a first frame on which the device substrate is arranged, and a reflector that reflects the light formed by the light-emitting element is provided in the first frame.

[0018] Alternatively, the reflector may be provided as a light-emitting device having a circular shape surrounding the light-emitting element.

[0019] Alternatively, a light-emitting device may be provided, wherein the light-emitting portion includes: a light-emitting element; a first reflective layer on which the light-emitting element is arranged and reflects light; a transmissive layer arranged on an upper side of the light-emitting element and transmitting light; and a second reflective layer on which the transmissive layer is arranged to be spaced apart from the light-emitting element and reflects light.

[0020] Alternatively, a light emitting device may be provided in which the reflectivity of the second reflective layer is equal to or greater than the reflectivity of the first reflective layer, the height of the first reflective layer is smaller than the distance between the light emitting element and the second reflective layer, the height of the first reflective layer is smaller than the height of the transmissive layer, the height of the second reflective layer is lower than the height of the transmissive layer, the horizontal length of the first reflective layer is larger than the horizontal length of the light emitting element, and the horizontal length of the first reflective layer is smaller than the horizontal length of the transmissive layer.

[0021] Alternatively, a light-emitting device may be provided, wherein the light-emitting portion comprises: a light-emitting element; a transparent layer disposed on an upper side of the plurality of light-emitting elements and transmitting light; and a first reflective layer on which the light-emitting element is disposed and which reflects light, and further comprising a spacer on which the transparent layer is disposed to be spaced apart from the light-emitting element and which scatters light, wherein a distance between the light-emitting element and the spacer is greater than a length of the first reflective layer in a horizontal direction.

[0022] Alternatively, a light-emitting device may be provided, wherein the light-emitting unit includes: a plurality of light-emitting elements; a first reflective layer on which the plurality of light-emitting elements are arranged; a transparent layer arranged on an upper side of the plurality of light-emitting elements and transmitting light; and a plurality of second reflective layers arranged on the transparent layer so as to be spaced apart from the plurality of light-emitting elements and reflecting light.

[0023] Alternatively, a light-emitting device may be provided in which the light-emitting element includes a light-emitting structure that generates light; and a light-transmitting layer that is laminated on the light-emitting structure and transmits light generated from the light-emitting structure, and the height of the first reflective layer is greater than the height of the light-emitting structure.

[0024] Alternatively, a light emitting device may be provided in which a distance between the light transmitting layer and the second reflective layer is greater than a height of the light emitting structure, the height of the light transmitting layer is greater than a height of the second reflective layer, the height of the light emitting structure is lower than a height of the light transmitting layer, and the height of the light emitting structure is lower than a height of the second reflective layer.

[0025] Alternatively, a light emitting device may be provided in which the first reflective layer is formed in a plurality of pieces, and the plurality of first reflective layers include a first sub-reflective layer that extends in a first direction and supports some of the plurality of light emitting elements; and a second sub-reflective layer that extends in a second direction perpendicular to the first direction from the first sub-reflective layer and on which other parts of the plurality of light emitting elements are disposed, some of the plurality of light emitting elements are disposed in the first sub-reflective layer to be spaced apart from each other in the first direction, and other parts of the plurality of light emitting elements are disposed in the second sub-reflective layer to be spaced apart from each other in the first direction, and a separation distance between the plurality of light emitting elements in the first direction is smaller than a separation distance between the plurality of light emitting elements in the second direction, and the transmissive layers of the plurality of light emitting devices are connected to each other and formed integrally.

[0026] Alternatively, a light emitting device may be provided, comprising: a plurality of light emitting units; a substrate on which the plurality of light emitting units are arranged; and a bottom reflective layer disposed on the substrate such that at least a portion of the bottom reflective layer is disposed between the plurality of light emitting units, wherein each of the plurality of light emitting units comprises: a device substrate; a light emitting element disposed on the device substrate; a first reflective layer disposed between the light emitting element and the device substrate to reflect light; a transparent layer disposed on an upper side of the light emitting element to transmit light; and a second reflective layer disposed on the transparent layer to reflect light so as to be spaced apart from the light emitting element, wherein the height of the bottom reflective layer is greater than the height of the first reflective layer.

[0027] Alternatively, a light-emitting device may be provided, including a light-emitting unit; and a substrate on which the light-emitting unit is arranged, wherein the light-emitting unit includes a light-emitting element, and heat formed in the light-emitting unit spreads in a second direction parallel to the substrate and is emitted in a third direction perpendicular to the substrate, wherein the second direction is perpendicular to the third direction.

[0028] Alternatively, a light emitting device may be provided in which the light emitting portion includes a substrate, the substrate is arranged in a direction perpendicular to the substrate, and the heat is emitted to the outside along the substrate.

[0029] Alternatively, a light emitting device may be provided, including a light emitting unit; and a substrate on which the light emitting unit is arranged, wherein the light emitting unit generates light so that the light direction is directed in a first direction parallel to the substrate, and is formed so that the light can also be emitted in a second direction parallel to the substrate, and the first direction is perpendicular to the second direction.

[0030] Embodiments of the present invention can generate light that can be used to eliminate harmful organisms by efficiently reflecting light.

[0031] Additionally, it can effectively reflect light to induce an avoidance response in marine life, thereby preventing marine life from sticking to ships.

[0032] Additionally, it can attract insects by effectively reflecting light and inducing the influx of insects.

[0033] Additionally, it can efficiently emit light by increasing light extraction efficiency.

[0034] Additionally, it can increase heat dissipation efficiency and improve reliability by dissipating heat efficiently.

[0035] Additionally, brightness can be improved by adjusting the refraction direction.

[0036] Figure 1 is a drawing showing a light emitting device according to a first embodiment of the present invention mounted on a ship.

[0037] Fig. 2 is a drawing showing the second reflective layer of the light-emitting device of Fig. 1 formed to be convex downward.

[0038] Figure 3 is a drawing showing the second reflective layer of the light-emitting device of Figure 2 formed to be convex upward.

[0039] Fig. 4 is a drawing showing the appearance of the light emitting part of the light emitting device of Fig. 2 when viewed from above.

[0040] FIG. 5 is a drawing showing a first example of a light-emitting device according to a second embodiment of the present invention.

[0041] FIG. 6 is a drawing showing a second example of a light-emitting device according to a second embodiment of the present invention.

[0042] Fig. 7 is a perspective view of a light emitting portion of a light emitting device according to a third embodiment of the present invention.

[0043] Fig. 8 is a cross-sectional view of the light emitting part of Fig. 7 taken along line A-A'.

[0044] FIG. 9 is a drawing showing a plurality of light-emitting elements arranged in a first reflective layer of a light-emitting device according to a fourth embodiment of the present invention.

[0045] Fig. 10 is a perspective view of a light emitting device according to a fifth embodiment of the present invention.

[0046] Fig. 11 is a cross-sectional view taken along line AA' of the light emitting device of Fig. 10.

[0047] Fig. 12 is an exploded perspective view of the light emitting part of Fig. 10.

[0048] Fig. 13 is a drawing of the arrangement of the light emitting element of Fig. 10 on the package substrate when viewed from above.

[0049] Fig. 14 is a conceptual diagram of the light emitting element of Fig. 10.

[0050] 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 utilizing 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.

[0051] 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.

[0052] 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.

[0053] 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 a physical, electrical, and / or fluid connection, 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, “at least one of X, Y, and Z” and “at least one selected from the group consisting of X, Y, and 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] Hereinafter, a light emitting apparatus (1) according to the first embodiment of the present invention will be described.

[0061] Referring to Fig. 1, a light-emitting device (1) according to a first embodiment of the present invention can display characters, symbols, images, or videos, etc. In addition, the light-emitting device (1) can be mounted on a vehicle. Such a light-emitting device (1) can be included in a taillight, a headlight, a rear lamp, a tail lamp, etc. In addition, the light-emitting device (1) mounted on a vehicle can display information such as a stop signal or characters to the outside by emitting red opening light, yellow opening light, or white opening light.

[0062] In addition, the light emitting device (1) can be mounted on the vessel (2) to generate light to prevent marine life from attaching to the outer surface of the vessel (2). This light emitting device (1) can be placed at a position corresponding to the position of the ballast tank of the vessel (2) among the outer surfaces of the vessel (2). In other words, the light emitting device (1) for a vessel can be included in the vessel (2), and when water flows into or discharges from the ballast tank of the vessel (2), light can be irradiated on marine life to prevent them from attaching to the outer surface of the vessel (2). This light emitting device (1) can include a light emitting unit (100) and a substrate (200).

[0063] Referring further to FIGS. 2 and 3, the light emitting unit (100) can generate light. The light emitting unit (100) can be disposed on the substrate (200) and connected to an electrical circuit of the substrate (200). The light emitting unit (100) can generate light such that the main emission direction faces a first direction (hereinafter referred to as the “x-axis direction”) parallel to the substrate (200). The main emission direction can be defined as a direction in which radiant energy emitted from a light emitting element or light source is maximized per unit solid angle. In other words, the main emission direction can be defined as a direction in which the maximum radiant intensity is measured. In addition, the beam angle can be defined as an angular range in which radiant light having a radiant intensity greater than a certain ratio is distributed with respect to the main beam direction. As an example, the beam angle can be an angular range in which radiant light having 50% or 80% of the peak radiant intensity is distributed with respect to the main beam direction.

[0064] In addition, the light emitting portion (100) can also emit light in a second direction (hereinafter referred to as “y-axis direction”) that is parallel to the substrate (200) and parallel to the first direction. In other words, the first direction can be perpendicular to the second direction. The emission intensity of light emitted in the first direction parallel to the substrate (200) can be greater than the emission intensity of light emitted in the second direction parallel to the substrate (200) and parallel to the first direction.

[0065] As light is generated in the light-emitting portion (100), heat may also be generated. The heat generated in the light-emitting portion (100) may spread in the y-axis direction. In addition, the heat formed in the light-emitting portion (100) may be emitted in a direction perpendicular to the substrate (200) (hereinafter referred to as the 'z-axis direction').

[0066] The main emission direction of light generated from the light emitting unit (100) may be directed toward the x-axis direction. The main diffusion direction of heat generated from the light emitting unit (100) may be parallel to the y-axis direction. The main emission direction of light generated from the light emitting unit (100) and the main diffusion direction of heat in the light emitting unit (100) may be formed to be perpendicular to each other. Since the main emission direction of light and the main diffusion direction of heat are perpendicular to each other, optical interference due to heat generated from the light emitting unit (100) may be reduced.

[0067] In addition, the main emission direction of the heat generated from the light emitting unit (100) may be oriented in the z-axis direction. The main direction of the light generated from the light emitting unit (100) and the main emission direction of the heat from the light emitting unit (100) may be formed perpendicular to each other. By making the main direction of the light and the main emission direction of the heat perpendicular, optical interference due to the heat generated from the light emitting unit (100) can be reduced.

[0068] In addition, the main diffusion direction of the heat generated from the light-emitting unit (100) and the main emission direction of the heat generated from the light-emitting unit (100) can be formed perpendicular to each other. Since the main heat diffusion direction and the main heat emission direction are perpendicular to each other, the light-emitting unit (100) can secure heat capacity, and the bottleneck phenomenon within the light-emitting unit (100) can be reduced, thereby increasing the reliability of the light-emitting device (1). Such light-emitting units (100) can be formed in multiple pieces.

[0069] A plurality of light emitting units (100) may be arranged adjacent to each other to generate light respectively. For example, the plurality of light emitting units (100) may be arranged in N rows and M columns to generate light respectively. In other words, the plurality of light emitting units (100) may be arranged in N×M matrices to generate light respectively. The number of rows, N, and the number of columns, M, of the plurality of light emitting units (100) may be the same or different. In addition, each light emitting unit (100) may be individually driven for each area to control brightness or control light emitting area. The light emitting unit (100) may generate blue, green, red, white light, UV light, etc. Marine life may be prevented from attaching to the ship (2) by the light generated from the light emitting unit (100). The light-emitting portion (100) may include a light-emitting element (110), a transparent layer (120), a first reflective layer (130), a second reflective layer (140), and a spacer (150).

[0070] The light-emitting element (110) can generate light. The light-emitting element (110) is electrically connected to the electric circuit of the substrate (200) and can generate light by receiving electricity from the outside through the electric circuit. The light-emitting element (110) can be disposed between the first reflective layer (130) and the transparent layer (120). In other words, the light-emitting element (110) can be disposed on the first reflective layer (130) and irradiate light toward the transparent layer (120). The light-emitting element (110) can be disposed spaced apart from the second reflective layer (140) and the transparent layer (120) in the vertical direction.

[0071] The length (L1) of the light-emitting element (110) in the horizontal direction (y-axis direction in FIG. 2) may be smaller than the length (L2) of the first reflective layer (130) in the horizontal direction and the length (L2) of the transmissive layer (120) in the horizontal direction. The height of the light-emitting element (110) may be greater than at least one of the height (D1) of the transmissive layer (120) and the height (D2) of the first reflective layer (130). The height of the light-emitting element (110) may be greater than the height (length in the z-axis direction in FIG. 2) of the second reflective layer, thereby increasing the side light extraction efficiency of the light-emitting element.

[0072] The transparent layer (120) can transmit light from the light-emitting element (110). The transparent layer (120) can be arranged to be spaced upward from the light-emitting element (110). For example, the transparent layer (120) can be formed of quartz, silicon, glass, ceramic, etc. The horizontal length (L2) of the transparent layer (120) can be greater than the horizontal length of the second reflective layer (140). The height (D1) of the transparent layer (120) can be greater than the height (D2) of the first reflective layer (130). In addition, the height (D1) of the transparent layer (120) can be greater than the height of the second reflective layer (140) and can prevent damage to the second reflective layer from the external environment.

[0073] The first reflective layer (130) can be arranged on the lower side of the light-emitting element (110) to reflect light. The first reflective layer (130) can be arranged between the light-emitting element (110) and the substrate (200). In other words, the first reflective layer (130) can increase the amount of light by reflecting a portion of the light emitted from the light-emitting element (110) and irradiated toward the substrate (200) or the light reflected from the second reflective layer (140) toward the substrate (200) toward the transmission layer (120). The first reflective layer (130) and the second reflective layer (140) can be formed so that at least one of reflectivity, thermal conductivity, and thermal expansion coefficient is different from each other. The first reflective layer (130) can efficiently release the heat of the light-emitting element (110) when in contact with the light-emitting element (110), so that the heat dissipation of the light-emitting element (110) can be transferred to the outside, and the thermal resistance can be reduced to improve the reliability of the light-emitting part (100). The reflectivity of the first reflective layer (130) can be formed to be lower than the reflectivity of the second reflective layer (140). For example, the reflectivity of the second reflective layer (140) can be 1.5 to 2 times higher than the reflectivity of the first reflective layer (130) at the peak wavelength of the emission spectrum of the light-emitting element (110). Through this, the light reflection path can be diversified, thereby increasing the light extraction efficiency. In addition, the thermal expansion coefficient of the first reflective layer (130) can be formed to be smaller than the thermal expansion coefficient of the second reflective layer (140), and thermal shock can be alleviated so that the light-emitting element (110) does not detach from the substrate (200).

[0074] The horizontal length (L2) of the first reflective layer (130) may be greater than the horizontal length (L1) of the light emitting element (110). The horizontal length (L2) of the first reflective layer (130) may be greater than the horizontal length of the second reflective layer (140). In addition, the horizontal length (L2) of the first reflective layer (130) may be the same as the horizontal length of the transmissive layer (120), thereby allowing light directed toward the lower surface to be reflected toward the upper surface. However, the present invention is not limited thereto, and may be less than the horizontal length of the transmissive layer (120). In addition, the height of the first reflective layer (130) may be greater than the height of the second reflective layer (140), and a sufficient thickness of the first reflective layer may be secured to increase the reflectivity toward the upper surface. The thickness of the first reflective layer (130) may be greater than the length between the lower surface of the light-emitting element (110) and the upper surface of the light-emitting element (110). In other words, the thickness of the first reflective layer (130) may be 1.1 to 2 times the height-wise thickness of the light-emitting element (110). The thickness of the first reflective layer (130) may be greater than the thickness of the light-emitting element (110), thereby increasing the reflectivity toward the upper surface.

[0075] Referring to FIG. 2, the second reflective layer (140) may be disposed in one area of ​​the transparent layer (120) to reflect light. As a first example, the second reflective layer (140) may be disposed on the lower surface of the transparent layer (120). In addition, the second reflective layer (140) may be formed to be convex toward the bottom, but is not limited thereto, and may be formed to be concave. In addition, the second reflective layer (140) may have a surface whose slope with respect to the first reflective layer (130) gradually increases as it is spaced horizontally from the center of the light-emitting element (110). Through this, the reflection angle may be widened as it goes to the side, thereby having a wide directivity angle. In addition, the thickness may be gradually thinner as it goes away from the center of the light-emitting element, and through this, the transmittance may increase as it goes to the side compared to the center, thereby widening the directivity angle of the light-emitting unit (100).

[0076] Referring to FIG. 3, as a second example, the second reflective layer (140) may be disposed on the upper surface of the transparent layer (120). In addition, the second reflective layer (140) may be formed to be convex toward the top, but is not limited thereto, and may be formed to be concave. In addition, the second reflective layer (140) may become thinner toward the outside, and through this, the transmittance increases toward the outside, thereby increasing the light transmitted to the side more than the center, thereby widening the light beam angle. At this time, the reflective surface of the second reflective layer (140) facing the light emitting element (110) may be a planar phenomenon, and process errors may be reduced by making the reflective surface uniform. The second reflective layer (140) may be disposed on the transparent layer (120) so as to be spaced apart from the light emitting element (110). In other words, the second reflective layer (140) may be spaced apart from the light emitting element (110) in the vertical direction. The second reflective layer (140) may include at least one of alumina (Al2O3), titanium dioxide (TiO2), or barium sulfate (BaSO4), which is a reflective filler for increasing reflectivity, and an organic compound binder such as silicon or epoxy, which acts as a binder to stably hold the shape of light reflected by the second reflective layer (140). In addition, a plurality of fillers such as silica or glass fiber may be further included inside the second reflective layer (140), thereby increasing the strength of the second reflective layer (140). In addition, since the second reflective layer (140) is disposed on the transmission layer (120), the light collection efficiency (light collection degree) of the light emitting element (110) can be further improved, and thus the sterilizing effect and the curing effect can be improved. The reflectivity of the second reflective layer (140) may be equal to or greater than the reflectivity of the first reflective layer (130).

[0077] The horizontal length of the second reflective layer (140) may be smaller than at least one of the first reflective layer (130) and the transparent layer (120), so that some of the light reflected through the second reflective layer (140) may be reflected back to the upper surface through the first reflective layer (130), thereby increasing light extraction efficiency. In addition, the height of the second reflective layer (140) may be smaller than at least one of the height (D2) of the first reflective layer (130) and the height (D1) of the transparent layer (120). In addition, the horizontal length of the second reflective layer (140) may be smaller than the horizontal length of the light emitting element (110).

[0078] Referring further to FIG. 4, the spacer (150) may be formed to be elongated in the vertical direction to support the transmission layer (120). The spacer (150) may be positioned between the first reflective layer (130) and the transmission layer (120). In other words, the spacer (150) may extend upward from the upper surface of the first reflective layer (130) to support the transmission layer (120).

[0079] By means of the spacer (150), the second reflective layer (140) and the transparent layer (120) can be spaced upward from the light emitting element (110). The spacer (150) can be formed of a light-transmitting material and can scatter light. In other words, light can be scattered while passing through the spacer (150), thereby widening the light-direction angle of the light emitting portion (100). A step can be formed on the upper portion of the spacer (150) to stably support the transparent layer (120). In addition, the spacer (150) can be formed in multiple pieces to support the edge of the transparent layer (120). In other words, the multiple spacers (150) can support the edge of the transparent layer (120) and scatter the light in the edge region to increase the light uniformity. The edge of the transmission layer (120) can be formed to correspond to the step shape of the spacer (150).

[0080] A light emitting unit (100) may be arranged on a substrate (200). For example, the substrate (200) may be a printed circuit board (PCB) substrate on which an electric circuit is printed. In addition, the substrate (200) may be a thin-film transistor (TFT) backplane. The substrate (200) 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 (200) 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 (200) may include ceramics such as alumina (Al2O3), aluminum nitride (AlN), and Zirconia Toughened Alumina (ZTA).

[0081] Hereinafter, a light emitting device (1) of a second embodiment of the present invention will be described with reference to FIGS. 5 and 6. In describing the second embodiment, there are differences in that a plurality of light emitting parts (100) are formed and a lower reflective layer (300) is additionally included. These differences will be mainly described.

[0082] Referring to FIG. 5, a plurality of light-emitting units (100) may be arranged horizontally spaced apart from each other on a substrate (200). For example, the plurality of light-emitting units (100) may include a first light-emitting unit (100a) and a second light-emitting unit (100b), and a distance (S) between the first light-emitting unit (100a) and the second light-emitting unit (100b) may be formed to be longer than a length (L9) in the horizontal direction of a bottom reflective layer (300) arranged between the first light-emitting unit (100a) and the second light-emitting unit (100b), which will be described later. Through this, the bottom reflective layer (300) may reduce optical dae-image, thereby improving the reliability of the light-emitting device (1). Each light-emitting element (110) of the plurality of light-emitting units (100) may further include an element substrate (160).

[0083] The device substrate (160) may include a substrate base and a conductive pattern. The substrate base may be formed of at least one material selected from the group consisting of phenol, epoxy, polyimide, and ceramic. That is, the substrate base may be formed of an insulating material. In addition, the substrate base may include a metal layer and an insulating layer formed on the surface of the metal layer. For example, the insulating layer may be an insulating resin including phenol, epoxy, or fluororesin, or a metal or metal oxide. That is, the substrate base may be formed in a structure that is insulated from the conductive pattern. In addition, the substrate base is not limited to the materials and structures described above, and may be formed to have various materials or structures that are insulated from the conductive pattern.

[0084] Additionally, the substrate base may further include a ceramic filler. When the substrate base includes a ceramic filler, the heat dissipation efficiency of the light-emitting device may be improved, and the light reflectivity of the substrate may be improved.

[0085] The conductive pattern may be formed on the upper and lower portions of the substrate base. In addition, the conductive pattern may be further formed on the inside or side of the substrate base to electrically connect the conductive pattern formed on the upper portion of the substrate base with the conductive pattern formed on the lower portion of the substrate base. The conductive pattern may be formed of any conductive material. For example, the conductive pattern may be formed of at least one of Cu, W, Ag, Au, Ni, and Pd. When the conductive pattern is made of a metal, the heat dissipation efficiency of the light emitting element (110) may be improved.

[0086] The conductive pattern of the substrate (160) is electrically connected to the light-emitting member, and the substrate can supply power to the light-emitting element (110) through the conductive pattern.

[0087] Additionally, the light-emitting element (110) may include a light-emitting structure (111), a light-transmitting layer (112), and an electrode (113).

[0088] The light-emitting structure (111) can generate light. The total thickness of the light-emitting structure (111) can be in the range of 1 um to 10 um. The light-emitting structure (111) can include a first conductive semiconductor layer, an active layer, and a second conductive semiconductor layer.

[0089] The first conductive semiconductor layer may be suitably connected to the device substrate (160). The first conductive semiconductor layer may include an n-type impurity (e.g., Si, Ge, Sn), in which case the first conductive semiconductor layer may be an n-type semiconductor layer. However, this is merely an example, and the first conductive semiconductor layer may also include a p-type impurity.

[0090] The active layer may be laminated on the first conductive semiconductor layer. In other words, the active layer may be positioned between the first conductive semiconductor layer and the second conductive semiconductor layer. In addition, the first conductive semiconductor layer and the active layer may form a mesa. The length (L3) of the mesa in the horizontal direction may be smaller than the separation distance (S) between the first light-emitting portion (100a) and the second light-emitting portion (100b). Through this, the light-emitting area of ​​the light-emitting portions (100a, 100b) may be maximized, and interference between the light-emitting portions (100a, 100b) may be reduced, thereby improving the light-emitting efficiency of the light-emitting device (1).

[0091] The second conductive semiconductor layer may be laminated on the active layer and electrically connected to the device substrate (160). The second conductive semiconductor layer may include a p-type impurity (e.g., Mg, Sr, Ba). In this case, the second conductive semiconductor layer may be a p-type semiconductor layer. However, this is merely an example, and the second conductive semiconductor layer may also include a p-type impurity.

[0092] The light-transmitting layer (112) may be laminated on the light-emitting structure (111). In other words, the light-transmitting layer (112) may be laminated on the second conductive semiconductor layer. The light-transmitting layer (112) may be an insulating or conductive substrate for growing the first conductive semiconductor layer, the active layer, and the second conductive semiconductor layer. For example, the light-transmitting layer (112) may include one or more of a sapphire substrate, a silicon carbide substrate, a silicon substrate, a gallium nitride substrate, and an aluminum nitride substrate.

[0093] The electrode (113) can be electrically connected to the light-emitting structure (111) and the device substrate (160). In other words, the electrode (113) can be electrically connected to the first conductive semiconductor layer and the device substrate (160), or can be electrically connected to the second conductive semiconductor layer and the device substrate (160). By means of the electrode (113), electricity can be applied to the light-emitting structure (111) so that the light-emitting structure (111) can emit light.

[0094] The bottom reflective layer (300) can be arranged on the substrate (200) to reflect light. For example, the bottom reflective layer (300) can reflect light upwards that is reflected by the second reflective layer (140) or that has passed through the spacer (150). The bottom reflective layer (300) can be arranged between a plurality of light-emitting units (100) and can be arranged on the substrate (200) so as to be arranged on the outer side of the plurality of light-emitting units (100). For example, at least a portion of the bottom reflective layer (300) can be arranged between the first light-emitting unit (100a) and the second light-emitting unit (100b). The bottom reflective layer (300) can have a reflectivity that is different from or the same as at least one of the first reflective layer (130) and the second reflective layer (140). The area of ​​the lower reflective layer (300) may be larger than that of the first reflective layer (130) and the second reflective layer (140), and light that is reflected by the second reflective layer (140) or is not reflected by the first reflective layer (130) and is directed downward may be reflected upward. Through this, the light extraction efficiency of the light-emitting unit (100a, 100b) may be increased.

[0095] Meanwhile, referring to FIG. 6, the transparent layers (120) of a plurality of light-emitting units (100) can be connected to each other and formed as a single body. In other words, the transparent layer (120) of the first light-emitting unit (100a) and the transparent layer (120) of the second light-emitting unit (100b) can be connected to each other.

[0096] In addition, since the height (D7) of the first reflective layer (130) according to the second embodiment can be smaller than the height (D5) of the light-transmitting layer (112), a light refraction path can be secured, the amount of light can be improved, and the light can be smoothly reflected laterally. Since the height (D7) of the first reflective layer (130) can be smaller than the distance (D6) between the light-transmitting layer (112) and the second reflective layer (140), a light movement path can be secured, and a light beam angle can be adjusted. Since the height (D7) of the first reflective layer (130) can be larger than the height (D4) of the light-emitting structure (111), the light reflectivity can be secured. When the height (D7) of the first reflective layer (130) is smaller than the height (D4) of the light-emitting structure (111), the light reflectivity in the first reflective layer (130) can be reduced and the light absorption can be increased.

[0097] In addition, the height (D7) of the first reflective layer (130) may be greater than or less than the height (D8) of the second reflective layer (140). When the height (D7) of the first reflective layer (130) is greater than the height (D8) of the second reflective layer (140), the reflectivity of the first reflective layer (130) may be improved, thereby increasing the amount of light. When the height (D7) of the first reflective layer (130) is less than the height (D8) of the second reflective layer (140), the reflectivity of the second reflective layer (140) may be secured, thereby increasing the amount of light reflected laterally. Since the height (D7) of the first reflective layer (130) may be less than the height (D1) of the transmissive layer (120), the refraction distance of light in the transmissive layer (120) may be secured. The height (D7) of the first reflective layer (130) is formed to be smaller than the height (D9) of the bottom reflective layer (300) disposed between the first light-emitting portion (100a) and the second light-emitting portion (100b), so that the reflectivity of light in the bottom reflective layer (300) can be secured.

[0098] The height (D5) of the light transmitting layer (112) may be smaller or larger than the distance (D6) between the light transmitting layer (112) and the second reflective layer (140). When the height (D5) of the light transmitting layer (112) is larger than the distance (D6) between the light transmitting layer (112) and the second reflective layer (140), a light reflection path can be secured, thereby obtaining a wide light irradiance. When the height (D5) of the light transmitting layer (112) is smaller than the distance (D6) between the light transmitting layer (112) and the second reflective layer (140), the light reflection path can be narrowed, thereby allowing the light irradiance to be adjusted. The height (D5) of the light transmitting layer (112) is formed to be greater than the height (D4) of the light emitting structure (111), so that a light refraction path can be secured, and light can be transmitted from the upper surface or side of the light transmitting layer (112) rather than the light emitting structure (111). The height (D5) of the light transmitting layer (112) is formed to be greater than the height (D8) of the second reflective layer (140), so that a light refraction path can be secured. Through this, interference in the light path of the light emitting portions (100a, 100b) can be reduced, and the light extraction efficiency of the light emitting portions (100a, 100b) can be increased.

[0099] In addition, the height (D5) of the light transmitting layer (112) may be formed to be greater or less than the height (D1) of the transparent layer (120). When the height (D5) of the light transmitting layer (112) is formed to be greater than the height (D1) of the transparent layer (120), the refraction distance of light in the transparent layer (120) can be secured. When the height (D5) of the light transmitting layer (112) is formed to be less than the height (D1) of the transparent layer (120), the light emitting element (110) can be efficiently protected by the transparent layer (120). The height (D5) of the light transmitting layer (112) is formed to be greater than the height (D9) of the bottom reflective layer (300) disposed between the first light emitting portion (100a) and the second light emitting portion (100b), so that the refraction path of light can be secured.

[0100] The distance (D6) between the light transmitting layer (112) and the second reflective layer (140) is formed to be greater than at least one of the height (D5) of the light emitting structure (111) and the height (D8) of the second reflective layer (140), so that the light can travel a certain distance and the light beam angle can be widened. In addition, the distance (D6) between the light transmitting layer (112) and the second reflective layer (140) can be formed to be greater or smaller than the height (D1) of the light transmitting layer (120). When the distance (D6) between the light transmitting layer (112) and the second reflective layer (140) is formed to be greater than the height (D1) of the light transmitting layer (120), the light can travel a certain distance, the light beam angle can be widened, and the light quantity can be improved. When the distance (D6) between the light transmitting layer (112) and the second reflective layer (140) is formed to be smaller than the height (D1) of the transparent layer (120), the refracted distance of light in the transparent layer (120) can be secured. The distance (D6) between the light transmitting layer (112) and the second reflective layer (140) is formed to be larger than the height (D9) of the bottom reflective layer (300) disposed between the first light emitting portion (100a) and the second light emitting portion (100b), so that the travel distance of light can be secured, the angle of incidence can be widened, and the amount of light can be improved.

[0101] The height (D4) of the light emitting structure (111) is formed to be smaller than the height (D8) of the second reflective layer (140), so that the reflectivity of light in the second reflective layer (140) can be secured. The height (D4) of the light emitting structure (111) is formed to be smaller than the height (D1) of the transmissive layer (120), so that the refraction distance of light can be secured, and the beam angle can be widened. The height (D4) of the light emitting structure (111) is formed to be smaller than the height (D9) of the bottom reflective layer (300) disposed between the first light emitting portion (100a) and the second light emitting portion (100b), so that the travel distance of light can be secured, the beam angle can be widened, and the amount of light can be improved.

[0102] The height (D8) of the second reflective layer (140) is formed to be smaller than the height (D1) of the transparent layer (120), so that the light refraction distance can be secured and the light beam angle can be widened. In addition, the height (D8) of the second reflective layer (140) can be formed to be larger than the height (D9) of the bottom reflective layer (300) disposed between the first light-emitting portion (100a) and the second light-emitting portion (100b), so that the light beam reflectivity can be secured, but is not limited thereto. In other words, the height (D8) of the second reflective layer (140) can be formed to be smaller than the height (D9) of the bottom reflective layer (300) disposed between the first light-emitting portion (100a) and the second light-emitting portion (100b). Through this, some of the light can be transmitted to the upper surface to adjust the light beam angle pattern, thereby improving the sterilization efficiency or insect-catching efficiency.

[0103] The height (D1) of the transmission layer (120) is formed to be greater than the height (D9) of the lower reflective layer (300) disposed between the first light-emitting portion (100a) and the second light-emitting portion (100b), so that the light refraction distance can be secured.

[0104] The horizontal length (L6) of the first reflective layer (130) can be formed to be greater than the horizontal length (L4) of the light-transmitting layer (112), so that a reflection area can be secured and the light extraction efficiency can be increased. The horizontal length (L6) of the first reflective layer (130) can be formed to be smaller than the distance between the spacer (150) and the light-transmitting layer (112), so that interference by the spacer (150) can be minimized and the light extraction efficiency can be increased. The horizontal length (L6) of the first reflective layer (130) can be formed to be greater than the horizontal length (L3) of the mesa, so that a reflection area can be secured and the light extraction efficiency can be increased. The horizontal length (L6) of the first reflective layer (130) can be formed to be smaller or greater than the horizontal length (L7) of the second reflective layer (140), so that the beam angle can be adjusted. The horizontal length (L6) of the first reflective layer (130) is formed to be smaller than the horizontal length (L5) of the transparent layer (120), so that the transparent layer (120) can be protected from external impact. The horizontal length (L6) of the first reflective layer (130) is formed to be smaller than the horizontal length (L9) of the bottom reflective layer (300) disposed between the first light-emitting portion (100a) and the second light-emitting portion (100b), so that the reflection area of ​​the bottom reflective layer (300) is secured, so that the light extraction efficiency can be increased. The horizontal length (L6) of the first reflective layer (130) is formed to be smaller than the horizontal length (L8) of the device substrate (160), so that the first reflective layer (130) can be stably supported on the device substrate (160).

[0105] The horizontal length (L4) of the light transmitting layer (112) may be formed to be smaller or larger than the distance between the spacer (150) and the light transmitting layer (112). When the horizontal length (L4) of the light transmitting layer (112) is formed to be smaller than the distance between the spacer (150) and the light transmitting layer (112), interference of the spacer (150) can be minimized, thereby increasing light extraction efficiency. When the horizontal length (L4) of the light transmitting layer (112) is formed to be larger than the distance between the spacer (150) and the light transmitting layer (112), the light emitting portion (100) can be miniaturized, thereby increasing the directivity of the light emitting portion (100).

[0106] The horizontal length (L4) of the light transmitting layer (112) is formed to be greater than the horizontal length (L3) of the mesa, thereby securing a light refraction path, and light can be transmitted from the upper or side surface of the light transmitting layer (112) rather than the light emitting structure (111). The horizontal length (L4) of the light transmitting layer (112) is formed to be less than the horizontal length (L7) of the second reflective layer (140), thereby securing a reflection area of ​​the second reflective layer (140), and light can be efficiently reflected downward and to the side, thereby widening the angle of incidence. The horizontal length (L4) of the light transmitting layer (112) is formed to be less than the horizontal length (L5) of the transparent layer (120), thereby efficiently protecting the light emitting element (110). The horizontal length (L4) of the light transmitting layer (112) is formed to be smaller than the horizontal length (L9) of the bottom reflective layer (300) disposed between the first light emitting portion (100a) and the second light emitting portion (100b), so that the reflection area of ​​the bottom reflective layer (300) can be secured, thereby increasing the light extraction efficiency. The horizontal length (L4) of the light transmitting layer (112) can be formed to be smaller than the horizontal length (L8) of the device substrate (160), so that the light emitting device (110) can be designed stably.

[0107] The distance between the spacer (150) and the light transmitting layer (112) is formed to be greater than the horizontal length (L3) of the mesa, so that the light travels a certain distance and the light beam angle can be widened. The distance between the spacer (150) and the light transmitting layer (112) is formed to be less than the horizontal length (L7) of the second reflective layer (140), so that the reflection area of ​​the second reflective layer (140) can be widened and the light beam angle can be widened. The distance between the spacer (150) and the light transmitting layer (112) is formed to be less than the horizontal length (L4) of the light transmitting layer (112), so that the light emitting element (110) and the first reflective layer (130) can be efficiently protected. The distance between the spacer (150) and the light-transmitting layer (112) is formed to be smaller than the horizontal length (L9) of the bottom reflective layer (300) disposed between the first light-emitting portion (100a) and the second light-emitting portion (100b), so that the reflection area of ​​the second reflective layer (140) or the bottom reflective layer (300) can be secured and the reflection efficiency can be increased.

[0108] The horizontal length (L3) of the mesa is formed to be smaller than the horizontal length (L7) of the second reflective layer (140), so that the reflection area of ​​the second reflective layer (140) can be secured, thereby efficiently widening the beam angle. The horizontal length (L3) of the mesa is formed to be smaller than the horizontal length (L5) of the transmissive layer (120), so that the light emitting element (110) can be protected from the external environment. The horizontal length (L3) of the mesa is formed to be smaller than the horizontal length (L9) of the bottom reflective layer (300) disposed between the first light emitting portion (100a) and the second light emitting portion (100b), so that the reflection area of ​​the bottom reflective layer (300) can be secured, thereby increasing the light extraction efficiency.

[0109] The horizontal length (L7) of the second reflective layer (140) is formed to be smaller than the horizontal length (L5) of the transparent layer (120), so that the second reflective layer (140) can be stably placed on the transparent layer (120) while being protected. The horizontal length (L7) of the second reflective layer (140) is formed to be smaller than the horizontal length (L9) of the bottom reflective layer (300) placed between the first light-emitting portion (100a) and the second light-emitting portion (100b), so that the reflection area of ​​the bottom reflective layer (300) is secured, thereby increasing the light extraction efficiency.

[0110] The horizontal length (L7) of the second reflective layer (140) may be formed to be smaller than the horizontal length (L8) of the substrate (160), so that the light-emitting portion (100) can be designed stably. In addition, the horizontal length (L7) of the second reflective layer (140) may be formed to extend horizontally from the edge of the light-emitting element (110) toward the outside by an extension length (A). In other words, the edge of the second reflective layer (140) may be spaced apart from the edge of the light-emitting element (110) by an extension length (A) or more in the horizontal direction.

[0111] This extension length (A) can be formed as in the following mathematical expression 1, taking into account the area of ​​approximately 120°, which is the targeting angle of the light-emitting element (110).

[0112] [Mathematical Formula 1]

[0113]

[0114] In mathematical expression 1, θ can be formed to be 30° or less based on the orientation angle of the light emitting element (110). In other words, according to the Pythagorean definition, the extension length (A) can be greater than the value obtained by dividing the distance (D6) between the light transmitting layer (112) and the second reflective layer (140) by tan(30°). In addition, the length (L7) of the second reflective layer (140) in the horizontal direction can be as shown in mathematical expression 2 below.

[0115] [Equation 2]

[0116]

[0117] The horizontal length (L7) of the second reflective layer (140) may be longer than the sum of the extension length (A) and the horizontal length (L4) of the light-transmitting layer (112). Through this, the horizontal length (L7) of the second reflective layer (140) can sufficiently cover the irradiation area of ​​light directed upward among the directional patterns of the light-emitting element (110), thereby increasing the amount of light emitted to the side.

[0118] The horizontal length (L5) of the transparent layer (120) is formed to be smaller than the horizontal length (L9) of the bottom reflective layer (300) disposed between the first light-emitting portion (100a) and the second light-emitting portion (100b), so that the reflection area of ​​the bottom reflective layer (300) is secured, and light can be efficiently reflected upward. The horizontal length (L5) of the transparent layer (120) is formed to be smaller than the horizontal length (L8) of the substrate (160), so that the light-emitting portion (100) can be designed stably.

[0119] Referring to FIG. 6, the horizontal length (L5) of the transparent layer (120) can cover all of the plurality of light-emitting elements (110), simplifying the process and reducing the design difficulty.

[0120] Hereinafter, a light emitting device (1) according to a third embodiment will be described with reference to FIGS. 7 and 8.

[0121] In explaining the third embodiment, there is a difference in that the first reflective layer (130) can be formed in multiple pieces, and this difference will be mainly explained.

[0122] A plurality of light-emitting elements (110) may be arranged on a plurality of first reflective layers (130). The plurality of first reflective layers (130) may be formed to be long in a first direction (y-axis direction in FIG. 8) and may be arranged to be spaced apart from each other in a second direction (x-axis direction in FIG. 8) perpendicular to the first direction. Through this, the heat diffusion area within the light-emitting portions (100a, 100b) may be expanded, thereby increasing the heat dissipation efficiency of the light-emitting portions (100a, 100b). The plurality of first reflective layers (130) may include a first sub-reflective layer (131) and a second sub-reflective layer (132).

[0123] The first sub-reflective layer (131) may be extended in the first direction so that any one of the plurality of light-emitting elements (110) may be arranged thereon. The plurality of light-emitting elements (110) arranged in the first sub-reflective layer (131) may be arranged to be spaced apart from each other in the first direction.

[0124] The second sub-reflective layer (132) is arranged spaced apart from the first sub-reflective layer in the second direction, and may extend in the first direction so that other portions of the plurality of light-emitting elements (110) may be arranged. The distance (w1) between the plurality of light-emitting elements (110) in the first direction may be smaller than the distance (w2) between the plurality of light-emitting elements in the second direction, thereby increasing the uniformity of light in the first direction.

[0125] The transmission layer (120) may be formed in multiple pieces corresponding to the multiple first reflective layers (130). The multiple transmission layers (120) may be formed to extend in the first direction and may be arranged to be spaced apart from each other in the second direction. The extension length of the transmission layer (120) may be the same as the extension length (w4) of the first reflective layer (130), but is not limited thereto. Among the extension lengths of the transmission layer (120), one of the extension lengths (w4) of the first reflective layer (130) may be formed to be longer than the other, and the first reflective layer (130) may be protected from the external environment.

[0126] The second reflective layer (140) may be formed in a plurality of pieces and may be arranged on at least one transparent layer (120) to correspond to the positions of the plurality of light-emitting elements (110). Some of the plurality of second reflective layers (140) may be arranged in one area of ​​at least one transparent layer (120), and other parts of the plurality of second reflective layers (140) may be arranged to be spaced apart from each other in another area of ​​at least one transparent layer (120). The separation distance (w3) of the plurality of second reflective layers (140) in the first direction may be smaller than the length (w5) of the second reflective layers (140) in the horizontal direction. The separation distance (w3) of the plurality of second reflective layers (140) in the first direction may be smaller than the separation distance (w1) between the plurality of light-emitting elements (110) in the first direction, thereby allowing light emitted from the upper surface to be reflected laterally to widen the beam angle.

[0127] In addition, the height (t3) of the second reflective layer (140) may be formed to be different from at least one of the height (t2) of the first reflective layer (130) and the height (t1) of the light-emitting element (110). The height (t3) of the second reflective layer (140) may be formed to be smaller than the height (t2) of the first reflective layer (130) and may reflect some of the light reflected toward the lower surface back toward the upper surface, but is not limited thereto. The height (t3) of the second reflective layer (140) may be formed to be larger than the height (t2) of the first reflective layer (130) and may increase the reflectivity toward the lower surface. In addition, the height (t1) of the light-emitting element (110) may be formed to be smaller than at least one of the height (t3) of the second reflective layer (140) and the height (t2) of the first reflective layer (130), but is not limited thereto, and the height (t1) of the light-emitting element (110) may be formed to be larger than at least one of the height (t3) of the second reflective layer (140) and the height (t2) of the first reflective layer (130).

[0128] Hereinafter, with reference to FIG. 9, a light emitting device (1) according to the fourth embodiment will be described.

[0129] In explaining the fourth embodiment, there is a difference in that a plurality of light-emitting elements (110) can share one first reflective layer (130), and this difference will be mainly explained.

[0130] A plurality of light emitting elements (110) may be spaced apart from each other and share a first reflective layer (130). For example, the plurality of light emitting elements (110) may be arranged in N rows and M columns on the first reflective layer (130) to respectively generate light. In other words, the plurality of light emitting elements (110) may be arranged in N×M matrices to respectively generate light. The separation distance (x1) between the plurality of light emitting elements (110) in a first direction (x-axis direction in FIG. 9) may be smaller than the separation distance (x2) between the plurality of light emitting elements (110) in a second direction (y-axis direction in FIG. 9) perpendicular to the first direction.

[0131] In addition, the length (x4) of the plurality of light-emitting elements (110) in the first direction may also be formed to be smaller than the length (x3) of the plurality of light-emitting elements (110) in the second direction. In other words, the plurality of light-emitting elements (110) may be formed in a rectangular shape when viewed in the vertical direction (z-axis direction in FIG. 10), but is not limited thereto.

[0132] At this time, the area of ​​the first reflective layer (130) may be larger than the area arranged in N×M matrices. The length of the first reflective layer (130) in the first direction may be larger than the sum of x1 and x4. The length of the first reflective layer (130) in the first direction may be larger than the sum of x3 and x2. The minimum length extending laterally from the edge of the first reflective layer (130) to the light emitting element (110) may be larger than the length (x4) of the light emitting element (110) in the second direction. Since the plurality of second reflective layers (140) can cover all of the light emitting elements (110), the light generated upward from the light emitting element (110) can be reflected laterally, thereby efficiently widening the beam angle.

[0133] Hereinafter, a light emitting device (1) according to the fifth embodiment will be described with reference to FIGS. 10 to 13.

[0134] In explaining the fifth embodiment, there is a difference in that different light is generated from multiple light-emitting elements (110a, 110b), and this difference will be mainly explained.

[0135] Referring to FIGS. 10 and 11, a light-emitting device (1) according to a fifth embodiment of the present invention can be mounted on an insect trap (not shown) and generate light to attract insects into the insect trap. This light-emitting device (1) can be placed inside the insect trap. In other words, the light-emitting device (1) can generate light inside the insect trap so that insects outside are attracted into the insect trap by the light.

[0136] Referring further to FIGS. 12 and 13, the light-emitting unit (100) can generate light. The light-emitting unit (100) is electrically connected to the electric circuit of the substrate (200) and can generate light by receiving electricity from the outside through the electric circuit. The light-emitting unit (100) can further include a terminal (170), a first frame (180), and a second frame (190).

[0137] Referring further to FIG. 14, a light-emitting element (110) can generate light. A plurality of such light-emitting elements (110) may be provided. The plurality of light-emitting elements (110a, 110b) may include a first light-emitting element (110a) and a second light-emitting element (110b) that generate different wavelengths. In addition, the plurality of light-emitting elements (110a, 110b) may include a light-emitting structure (111), a light-transmitting layer (112), and an electrode (113).

[0138] The first light-emitting element (110a) can generate light of a different wavelength from the second light-emitting element (110b). For example, the first light-emitting element (110a) can emit visible light. For a more detailed example, the first light-emitting element (110a) can emit light of a wavelength of 400 nm to 500 nm. The user can recognize whether the insect trap is operating based on whether the light generated from the first light-emitting element (110a) is emitted. For example, if visible light is emitted from the first light-emitting element (110a), the user can recognize that the insect trap is operating. For another example, if the first light-emitting element (110a) does not emit visible light, the user can recognize that the insect trap is operating. If the first light-emitting element (110a) emits a wavelength of 500 nm or more, insects may have a lower preference for light, which may lower the insect trapping efficiency of the insect trap. Additionally, the wavelength difference between the first light-emitting element (110a) and the second light-emitting element (110b) may be 20 nm or more. This may prevent interference between the first light-emitting element (110a) and the second light-emitting element (110b).

[0139] The first light-emitting element (110a) may be arranged at the center of the substrate (200). As an example, the angle between an imaginary line passing through the center of the first light-emitting element (110a) and parallel to the element substrate (160) and the substrate (200) may be arranged to be perpendicular.

[0140] The second light-emitting element (110b) can generate light of a different wavelength from the first light-emitting element (110a). For example, the second light-emitting element (110b) can emit ultraviolet light. As a more specific example, the second light-emitting element (110b) can emit light of a wavelength of 315 nm to 400 nm. The ultraviolet light generated from the second light-emitting element (110b) can be light of a wavelength to which insects are sensitive. In other words, the ultraviolet light generated from the second light-emitting element (110b) can attract insects.

[0141] The second light-emitting element (110b) may be arranged in a direction opposite to the side of the first light-emitting element (110a). A plurality of such second light-emitting elements (110b) may be provided. For a more detailed example, there may be two second light-emitting elements (110b). The plurality of second light-emitting elements (110b) may be arranged to face the side of the first light-emitting element (110a) as the center. As an example, the second light-emitting element (110b) may be arranged to face the left side of the first light-emitting element (110a). As another example, the second light-emitting element (110b) may be arranged to face the right side of the first light-emitting element (110a).

[0142] The plurality of second light-emitting elements (110b) can emit light in different directions. For example, the plurality of second light-emitting elements (110b) can emit light in a direction away from the first light-emitting element (110a). As an example, the second light-emitting element (110b) positioned to face the left side of the first light-emitting element (110a) can emit light to the left. As another example, the second light-emitting element (110b) positioned to face the right side of the first light-emitting element (110a) can emit light to the right. In addition, the second light-emitting element (110b) can be positioned to face the side surfaces of the light-emitting elements (110a, 110b). This can reduce optical interference between the light-emitting elements (110a, 110b), thereby improving insect collection efficiency.

[0143] The first light-emitting element (110a) can generate light in a first direction parallel to the substrate (200). In addition, the second light-emitting element (110b) can generate light in a second direction parallel to the first direction while being parallel to the substrate (200). In other words, the first direction, which is the main direction of light of the first light-emitting element (110a), can be perpendicular to the second direction, which is the main direction of light of the second light-emitting element (110b). Through this, the light interference between the light of the second light-emitting element (110b) and heat of the first light-emitting element (110a) can be reduced.

[0144] The light-emitting structure (111) can generate light. The light-emitting structure (111) can include a first conductive semiconductor layer, an active layer, and a second conductive semiconductor layer. The wavelength of light emitted from the light-emitting structure (111) can be blue light and ultraviolet light. As an example, the first light-emitting element (110a) can form a blue light wavelength in the light-emitting structure (111) and emit visible light to the outside. As another example, the second light-emitting element (110b) can form an ultraviolet light wavelength in the light-emitting structure (111) and emit ultraviolet light to the outside. The light-emitting elements (110a, 110b) can be arranged on the element substrate (160).

[0145] The device substrate (160) may be arranged on the upper side of the terminal (170). For example, the device substrate (160) may be arranged to be connected to the side of the terminal (170). In addition, the device substrate (160) may be arranged in a direction perpendicular to the substrate (200). When the device substrate (160) is arranged in a direction perpendicular to the substrate (200), and the light-emitting device (110b) is connected to the device substrate (160), light generated from the light-emitting device (110b) may be emitted toward the outside.

[0146] The device substrate (160) can release heat generated from the light-emitting elements (110a, 110b) to the outside. In other words, the heat generated from the light-emitting elements (110a, 110b) can spread along the device substrate (160), and as the heat spreads, it can be released to the outside. Heat is released through the device substrate (160), and the heat management performance of the light-emitting device (1) can be improved. A plurality of such device substrates (160) can be provided. Referring again to FIG. 12, the device substrate (160) can be formed to extend in the y-axis direction. The length of the device substrate (160) in the y-axis direction can be longer than the length of the device substrate (160) in the x-axis direction. Through this, the efficiency of heat release to the outside by the device substrate (160) can be improved.

[0147] The terminal (170) can electrically connect the substrate (200) to the device substrate (160). In other words, the terminal (170) can be electrically connected to the device substrate (160) or to the substrate (200). Current can be applied from the substrate (200) to the device substrate (160) by the terminal (170), so that the light-emitting elements (110a, 110b) can emit light. The terminal (170) can have a folded shape surrounding one edge of the device substrate (160) and the first frame (180) and the second frame (190). The terminal (170) can be folded in a direction parallel to the z-axis. As an example, the terminal (170) can have a T-shape with two folds. As another example, the terminal (170) can have an L-shape with one fold. The terminal (170) is formed to be bent, thereby increasing the contact area between the terminal (170) and the substrate (200), thereby increasing the heat capacity of the terminal (170). The length parallel to the z-axis increased by the bending of the terminal (170) may be at least twice and less than ten times the thickness of the substrate (160). By increasing the thickness of the terminal (170), the heat capacity of the terminal (170) is increased, thereby reducing a bottleneck phenomenon within the terminal (170). The substrate (160) and the second frame (190) may be arranged in the groove formed in the terminal (170).

[0148] The first frame (180) can support the substrate (160). The first frame (180) can be arranged in a direction facing outward in a horizontal direction parallel to the substrate (200). In other words, the first frame (180) can be arranged on one side of the substrate (160). A hole can be formed on the inside of the first frame (180). When the first frame (180) and the substrate (160) are connected, light-emitting elements (110a, 110b) arranged on the substrate (160) can be arranged on the inside of the hole formed in the first frame (180). Since the light-emitting elements (110a, 110b) are arranged in the inner hole of the first frame (180), an open space is formed around the light-emitting elements (110a, 110b), so that interference between light emission paths can be reduced. A reflector (181) may be provided in this first frame (180).

[0149] The reflector (181) can reflect light. In other words, the reflector (181) can reflect the light generated from the light-emitting elements (110a, 110b) to increase the amount of light directed in one direction. The reflector (181) can have a circular shape surrounding the light-emitting elements (110a, 110b). In other words, the reflector (181) is disposed spaced apart from the light-emitting elements (110a, 110b) and can be formed around a circle. The reflector (181) can reflect the light generated from the light-emitting elements (110a, 110b) in a specific direction, thereby improving the light-gathering ability and directionality of the light-emitting unit 100) and improving the light-emitting efficiency of the light-emitting device (1). The reflector (181) can reflect the light directed in the z-axis direction in the x-axis direction. Through this, the light extraction efficiency of the light emitting element (110b) can be improved.

[0150] The second frame (190) can support the substrate (160). The second frame (190) can be arranged in a direction facing inward in a horizontal direction parallel to the substrate (200). In other words, the second frame (190) can be connected to the back surface of the substrate (160). The second frame (190) can be arranged on top of the terminal (170). The second frame (190) can be surrounded by the terminal (170). As an example, one edge of the second frame (190) can be surrounded by the terminal (170). The second frame (190) can be arranged in the groove of the terminal (170) together with the substrate (160) to stably fix the light emitting unit (100).

[0151] A circuit electrode (201) may be provided on the substrate (200). The circuit electrode (201) may be electrically connected to a connector (400). In other words, the circuit electrode (201) may be electrically connected to the light emitting unit (100) via the connector (400). The circuit electrode (201) may be formed as an area that extends in the y-axis direction. Through this, the heat diffusion efficiency within the substrate (200) may be improved, and the heat dissipation efficiency of the substrate (200) may be increased.

[0152] A connector (400) may be placed between a substrate (200) and a light-emitting portion (100) and may be electrically connected to a circuit electrode (201) and the light-emitting portion (100). The connector (400) may connect the substrate (200) and the light-emitting portion (100). The connector (400) may be a meltable metal or a metal alloy.

[0153] Below, the operation and effect of the light emitting device (1) according to the fifth embodiment will be described.

[0154] The light emitting device (1) can be connected to the insect trap. When current is applied to the substrate (200), current can be supplied to the light emitting unit (100) through the circuit electrode (201) and the connector (400). When current is applied to the light emitting unit (100), light can be generated from the light emitting unit (100). Visible light can be emitted from the first light emitting element (110a). A user can recognize that the insect trap is operating by recognizing the visible light emitted from the first light emitting element (110a). Ultraviolet light can be emitted from the second light emitting element (110b). Insects flying in the air outside the insect trap can be attracted to the insect trap by recognizing the ultraviolet light emitted from the second light emitting element (110b). In other words, external insects can be attracted to the ultraviolet light of the second light emitting element (110b) and enter the insect trap. The insect trap can remove insects that have entered the trap by applying high current to a high-voltage insecticide or electrode net, or catch insects with an adhesive sheet.

[0155] 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. Light-emitting part; and Including a substrate on which the above light-emitting part is arranged, The above light emitting part generates light so that the light direction is directed in a horizontal direction parallel to the substrate. Light-emitting device.

2. In paragraph 1, The above light emitting part is, Contains multiple light-emitting elements, The plurality of light-emitting elements include a first light-emitting element that emits visible light; and a second light-emitting element that emits ultraviolet light. Light-emitting device.

3. In paragraph 2, The above light emitting part is, The first light-emitting element is arranged at the center of the substrate, The second light-emitting element is arranged in a direction opposite to the side of the first light-emitting element. Light-emitting device.

4. In paragraph 2, The first light-emitting element is arranged to generate light in a first direction parallel to the substrate, The second light-emitting element is arranged to generate light in a second direction that is parallel to the substrate and perpendicular to the first direction. Light-emitting device.

5. In paragraph 2, The second light-emitting element is arranged to face the side of the first light-emitting element. Light-emitting device.

6. In paragraph 1, The above light emitting part is, Includes a substrate, Including a terminal that electrically connects the above-mentioned substrate and the above-mentioned board, Light-emitting device.

7. In paragraph 6, The above light emitting part is, It further includes a second frame on which the above-mentioned substrate is placed, The terminal has a shape that surrounds one edge of the substrate and one edge of the second frame. Light-emitting device.

8. In paragraph 1, The above light emitting part is, light emitting element; A device substrate on which the light-emitting device is arranged; and It includes a first frame on which the above-mentioned substrate is arranged, In the above first frame, a reflector is provided that reflects the light formed from the light emitting element. Light-emitting device.

9. In paragraph 8, The above reflector, Having a circular shape surrounding the above light-emitting element, Light-emitting device.

10. In paragraph 1, The above light emitting part is, light emitting element; A first reflective layer on which the light-emitting element is arranged and which reflects light; A transparent layer disposed on the upper side of the light-emitting element to transmit light; and The transmitting layer is arranged to be spaced apart from the light emitting element and includes a second reflective layer that reflects light. Light-emitting device.

11. In paragraph 10, The reflectivity of the second reflective layer is equal to or greater than the reflectivity of the first reflective layer. The height of the first reflective layer is smaller than the distance between the light-emitting element and the second reflective layer. The height of the first reflective layer is smaller than the height of the transmitting layer, The height of the second reflective layer is lower than the height of the transmissive layer, The horizontal length of the first reflective layer is greater than the horizontal length of the light-emitting element. The horizontal length of the first reflective layer is smaller than the horizontal length of the transmitting layer. Light-emitting device.

12. In paragraph 1, The above light emitting part is, light emitting element; A transparent layer that is arranged on the upper side of the plurality of light-emitting elements and transmits light; and The light-emitting element is arranged and includes a first reflective layer that reflects light, The transparent layer is arranged to be spaced apart from the light-emitting element, and further includes a spacer that scatters light, The distance between the light emitting element and the spacer is greater than the horizontal length of the first reflective layer. Light-emitting device.

13. In paragraph 1, The above light emitting part is, Multiple light emitting elements; A first reflective layer in which a plurality of light-emitting elements are arranged; A transparent layer that is arranged on the upper side of the plurality of light-emitting elements and transmits light; and A plurality of second reflective layers are disposed on the transmitting layer so as to be spaced apart from the plurality of light-emitting elements and reflect light. Light-emitting device.

14. In paragraph 13, The above light emitting element, A light-emitting structure that generates light; and It includes a light-transmitting layer laminated on the light-emitting structure to transmit light generated from the light-emitting structure, The height of the first reflective layer is greater than the height of the light-emitting structure. Light-emitting device.

15. In paragraph 14, The distance between the above light-transmitting layer and the second reflective layer is greater than the height of the light-emitting structure, The height of the above light transmitting layer is greater than the height of the second reflective layer, The height of the above light-emitting structure is lower than the height of the above transparent layer, The height of the above light-emitting structure is lower than the height of the second reflective layer, Light-emitting device.

16. In paragraph 15, The above first reflective layer is formed in multiple pieces, The above plurality of first reflective layers, A first sub-reflective layer extending in a first direction and supporting some of the plurality of light-emitting elements; and A second sub-reflective layer is provided, spaced apart from the first sub-reflective layer in a second direction perpendicular to the first direction and extending in the first direction, on which another part of the plurality of light-emitting elements is arranged, Some of the plurality of light-emitting elements are arranged spaced apart from each other in the first direction on the first sub-reflective layer, Other portions of the plurality of light-emitting elements are arranged spaced apart from each other in the first direction in the second sub-reflective layer, The separation distance between the plurality of light-emitting elements in the first direction is smaller than the separation distance between the plurality of light-emitting elements in the second direction. The above-mentioned transparent layers of the plurality of light-emitting devices are connected to each other and formed as one body. Light-emitting device.

17. Multiple light emitting parts; a substrate on which the plurality of light-emitting units are arranged; and At least a portion of the bottom reflective layer is disposed on the substrate so that it is disposed between a plurality of light-emitting portions on the substrate, Each of the above plurality of light-emitting units, Substrate; A light emitting element is arranged on the above substrate; A first reflective layer disposed between the light-emitting element and the element substrate to reflect light; A transparent layer disposed on the upper side of the light-emitting element to transmit light; and A second reflective layer disposed on the transparent layer to reflect light so as to be spaced apart from the light-emitting element, The height of the above-mentioned reflective layer is greater than the height of the first reflective layer. Light-emitting device.

18. Light-emitting part; and Including a substrate on which the above light-emitting part is arranged, The above light emitting part is, Contains a light emitting element, The heat formed in the above light-emitting portion spreads in a second direction parallel to the substrate and is emitted in a third direction perpendicular to the substrate. The second direction is perpendicular to the third direction, Light-emitting device.

19. In paragraph 18, The above light emitting part includes a substrate, The above-mentioned substrate is arranged in a direction perpendicular to the substrate, The above heat is released to the outside along the above substrate, Light-emitting device.

20. Light-emitting part; and Including a substrate on which the above light-emitting part is arranged, The above light emitting part is formed so that the light is generated in a first direction parallel to the substrate and the light can also be emitted in a second direction parallel to the substrate. The above first direction is perpendicular to the above second direction, Light-emitting device.

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