Light-emitting device

Abstract

According to an aspect of the present invention, provided may be a light-emitting device comprising: a substrate unit including a light-emitting substrate; a plurality of first light-emitting elements arranged on the light-emitting substrate in a first direction to generate light; and a plurality of second light-emitting elements arranged on the light-emitting substrate in the first direction to generate light, wherein the plurality of first light-emitting elements and the plurality of second light-emitting elements are arranged in a second direction perpendicular to the first direction, and the size of each of the plurality of first light-emitting elements on a plane is greater than the size of each of the plurality of second light-emitting elements.

Description

Light-emitting device

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

[0002] A light-emitting device is a device that generates light. Recently, light-emitting devices are used in various fields such as display devices, automobile lamps, and general lighting. Typically, a vehicle light-emitting device is installed at the front end of a vehicle and radiates light forward, thereby helping the driver secure a clear view. Such a light-emitting device may include multiple light-emitting elements that generate light to form a low beam pattern and a high beam pattern according to the driver's operation. For example, the light-emitting device must be able to radiate an appropriate amount of light over an appropriate range to satisfy the respective purposes of the low beam pattern and the high beam pattern.

[0003] However, conventional light-emitting devices have difficulty generating an appropriate amount of light for the intended purpose because the light-emitting elements are formed to have the same size.

[0004] An embodiment of the present invention seeks to provide a light-emitting device that is small in size and can generate an appropriate amount of light suitable for the purpose.

[0005] An embodiment of the present invention seeks to provide a light emitting device capable of generating light capable of forming a low beam pattern and a high beam pattern.

[0006] An embodiment of the present invention seeks to provide a light emitting device capable of forming various beam patterns.

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

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

[0009] According to one aspect of the present invention, a light-emitting device may be provided, comprising: a substrate unit including a light-emitting substrate; a plurality of first light-emitting elements arranged in a first direction on the light-emitting substrate and emitting light; and a plurality of second light-emitting elements arranged in the first direction on the light-emitting substrate and emitting light, wherein the plurality of first light-emitting elements and the plurality of second light-emitting elements are arranged in a second direction perpendicular to the first direction, and a size of each of the plurality of first light-emitting elements in a plane is larger than a size of each of the plurality of second light-emitting elements.

[0010] In addition, a light emitting device may be provided in which a ratio of a length of the second light emitting element in the second direction to a length of the second light emitting element in the first direction is smaller than a ratio of a length of the first light emitting element in the second direction to a length of the first light emitting element in the first direction.

[0011] Additionally, a light-emitting device may be provided in which the sum of the areas of the plurality of first light-emitting elements is greater than twice the sum of the areas of the plurality of second light-emitting elements.

[0012] In addition, a light-emitting device may be provided in which a length of the first light-emitting element in the first direction is smaller than a length of the second light-emitting element in the second direction, and a length of the first light-emitting element in the second direction is larger than a length of the second light-emitting element in the first direction.

[0013] In addition, a light-emitting device may be provided that further includes a reflective layer disposed on the light-emitting substrate and reflecting light generated from the plurality of first light-emitting elements and the plurality of second light-emitting elements.

[0014] In addition, a light-emitting device may be provided in which the reflective layer covers the peripheral surfaces of the plurality of first light-emitting elements and the peripheral surfaces of the plurality of second light-emitting elements.

[0015] In addition, a light emitting device may be provided, comprising: a substrate unit including a light emitting substrate; a plurality of first light emitting elements that are supported and arranged in a first direction on the light emitting substrate to generate light; and a plurality of second light emitting elements that are supported and arranged in a first direction on the light emitting substrate to generate light, wherein the light emitting substrate includes a first region in which the plurality of first light emitting elements are arranged; and a second region in which the plurality of second light emitting elements are arranged, and a length of the first region in the first direction is smaller than a length of the second region in the first direction.

[0016] In addition, a light emitting device may be provided in which a distance from one side of the first region to one side of the light emitting substrate is greater than a distance from one side of the second region to one side of the light emitting substrate.

[0017] In addition, a light emitting device may be provided in which the plurality of first light emitting elements include a plurality of first upper elements; and a plurality of second upper elements that are spaced further apart from the second light emitting elements than the plurality of first upper elements, and the first region includes a first upper element region in which the plurality of first upper elements are arranged; and a second upper element region in which the plurality of second upper elements are arranged, and a length of the first upper element region in the first direction is greater than a length of the second upper element region in the first direction.

[0018] In addition, a light emitting device may be provided in which the second upper element region is positioned inside the first upper element region when projected toward the first upper element region.

[0019] In addition, a light emitting device may be provided, including a substrate unit; a plurality of first light emitting elements supported by the substrate unit in a first direction and emitting light; a plurality of second light emitting elements supported by the substrate unit in a first direction and emitting light; and a plurality of pads supported by the substrate unit in a first direction and electrically connected to the plurality of first light emitting elements and the plurality of second light emitting elements, wherein the substrate unit includes a light emitting substrate supporting the plurality of first light emitting elements and the second light emitting elements; and a pad substrate supporting the plurality of pads and the light emitting substrate, wherein the light emitting substrate protrudes upward from the pad substrate such that a surface thereof is disposed above a surface of the pad substrate.

[0020] In addition, a light emitting device may be provided in which the vertical length of the light emitting substrate is greater than the vertical length of the pad substrate.

[0021] In addition, a light emitting device may be provided in which the plurality of pads include a plurality of first pads spaced apart from each other and electrically connected to the plurality of first light emitting elements; and a plurality of second pads spaced apart from each other and supported on the pad substrate and electrically connected to the plurality of second light emitting elements, and the light emitting substrate is disposed between the plurality of first pads and the plurality of second pads.

[0022] Additionally, a light emitting device may be provided in which the number of the plurality of second pads and the number of the plurality of first pads are different.

[0023] In addition, a light emitting device may be provided in which the spacing between the plurality of pads is greater than the spacing between the plurality of first light emitting elements and the spacing between the plurality of second light emitting elements.

[0024] In addition, a light emitting device may be provided in which the plurality of first pads include a plurality of first upper pads spaced apart from each other in the first direction; and a plurality of second upper pads spaced apart from each other in the first direction, but spaced further from the light emitting substrate than the plurality of first upper pads, and at least a portion of the plurality of first upper pads is arranged to overlap the plurality of second upper pads that are arranged adjacent to each other when projected in a second direction perpendicular to the first direction.

[0025] In addition, a light emitting device may be provided in which the plurality of second pads include a plurality of first lower pads spaced apart from each other in the first direction; and a plurality of second lower pads spaced apart from each other in the first direction, but arranged between the plurality of first lower pads and the light emitting substrate, and at least a portion of the plurality of second lower pads is arranged to overlap the plurality of first lower pads that are arranged adjacent to each other when projected in a second direction perpendicular to the first direction.

[0026] In addition, a light emitting device may be provided that further includes a heat sink that supports the pad substrate and dissipates heat from the pad substrate.

[0027] In addition, a light-emitting device may be provided, including: a plurality of controllers electrically connected to the plurality of pads for controlling the plurality of first light-emitting elements and the plurality of second light-emitting elements; and a plurality of bonding portions for electrically connecting the plurality of controllers and the plurality of pads.

[0028] In addition, a light emitting device may be provided in which at least one of the plurality of bonding portions is formed to be convex upward and the other side is opposite to the one side.

[0029] The light emitting device of one embodiment of the present invention is small in size and can generate light of an appropriate amount of light suitable for the purpose.

[0030] Additionally, the light-emitting device can generate light to form one or more patterns.

[0031] Embodiments of the present invention can increase the light extraction efficiency of a light-emitting device to efficiently emit light.

[0032] Embodiments of the present invention can finely control the light-emitting area.

[0033] Embodiments of the present invention can efficiently release heat, thereby increasing heat dissipation efficiency and improving reliability.

[0034] Figure 1 is a perspective view of a light emitting device according to a first embodiment of the present invention.

[0035] Fig. 2 is a cross-sectional view of the light emitting device of Fig. 1 taken along line A-A'.

[0036] Fig. 3 is a drawing showing the first light-emitting element and the second light-emitting element of the light-emitting device of Fig. 1.

[0037] FIG. 4 is a plan view showing a plurality of first light-emitting elements, a plurality of second light-emitting elements, and a plurality of pads of a light-emitting device according to a first embodiment of the present invention.

[0038] Figure 5 is an enlarged view of part B of Figure 4.

[0039] Fig. 6 is a graph showing the deviation of luminance of a light-emitting device according to the first embodiment of the present invention.

[0040] FIG. 7 is a drawing showing a plurality of first light-emitting elements and a plurality of second light-emitting elements of a light-emitting device according to a first embodiment of the present invention electrically connected to a plurality of pads.

[0041] FIG. 8 is a drawing showing a bonding portion arranged on a pad of a light-emitting device according to the first embodiment of the present invention.

[0042] Fig. 9 is a cross-sectional view taken along line B-B' of the bonding portion of Fig. 8.

[0043] Fig. 10 is a cross-sectional view of a light emitting device according to a second embodiment of the present invention.

[0044] FIG. 11 is a plan view showing a plurality of first light-emitting elements, a plurality of second light-emitting elements, and a plurality of pads of a light-emitting device according to a second embodiment of the present invention.

[0045] Fig. 12 is a plan view showing a substrate unit of a light emitting device according to a third embodiment of the present invention.

[0046] In the following description, for purposes of explanation, numerous specific details are set forth to provide a thorough understanding of various embodiments or implementations of the present disclosure. As used herein, the terms "embodiment" and "implementation" are interchangeable to refer to non-limiting examples of devices or methods that utilize one or more of the inventive concepts disclosed herein. However, it will be apparent that various embodiments may be practiced without utilizing these specific details or using one or more equivalent arrangements. In other instances, well-known structures and devices are shown in block diagram form to avoid unnecessarily obscuring the various embodiments. Furthermore, while the various embodiments may vary from one another, they are not necessarily exclusive. For example, specific features, configurations, and characteristics of an embodiment may be utilized or implemented in other embodiments without departing from the scope of the inventive concepts.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] Hereinafter, the specific configuration of the light emitting device (1) according to the first embodiment of the present invention will be described with reference to the drawings.

[0057] FIG. 1 is a schematic perspective view of a light-emitting device according to a first embodiment of the present invention, FIG. 2 is a schematic cross-sectional view taken along line A-A' of the light-emitting device of FIG. 1, and FIG. 3 is a schematic drawing showing a first light-emitting body and a second light-emitting body of the light-emitting device of FIG. 1.

[0058] Referring to FIGS. 1 to 3, a light-emitting device (1) according to a first embodiment of the present invention is a device that can receive power from the outside and generate light. The light-emitting device (1) can be applied to a vehicle headlamp, but is not limited thereto. In other words, the light-emitting device (1) can generate light toward a lens of a vehicle lamp disposed in front to form one or more patterns. The pattern can be a high beam pattern, a low beam pattern, a changeable pattern, or the like. The light-emitting device (1) can include a substrate unit (100), a first light-emitting element (200), a second light-emitting element (300), a reflective layer (400), a heat sink (500), a pad (600), a bonding portion (700), and a controller (800).

[0059] The substrate unit (100) can support the first light emitting element (200), the second light emitting element (300), and the pad (600). For example, the substrate unit (100) can be a printed circuit board (PCB), a ceramic substrate, a conductive substrate, etc. In addition, the substrate unit (100) can include an alloy composed of one or more of Cu, Zn, Au, Ni, Al, Mg, Cd, Be, W, Mo, Si, Ag, and Fe, or a part thereof. However, this is merely an example, and the substrate unit (100) can also include one or more of FR1, CEM-1, and FR-4. For example, FR1 can be a material in which copper foil and laminated paper are laminated, and CEM-1 can be a material in which copper foil, glass fiber fabric, laminated paper, and glass fiber fabric are sequentially laminated. In addition, FR-4 may be a material in which copper foil and glass fiber fabric or glass fiber fabric are laminated. In addition, the substrate unit (100) may include ceramics such as alumina (Al2O3), aluminum nitride (AlN), and Zirconia Toughened Alumina (ZTA). The length of the substrate unit (100) in the first direction may be greater than the length in the second direction perpendicular to the first direction. In addition, the substrate unit (100) may include a light emitting substrate (110) and a pad substrate (120).

[0060] The light-emitting substrate (110) can support a first light-emitting element (200) and a second light-emitting element (300). In other words, one or more first light-emitting elements (200) and one or more second light-emitting elements (300) can be arranged on the upper surface of the light-emitting substrate (110). Meanwhile, the sizes of one or more first light-emitting elements (200) and one or more second light-emitting elements (300) arranged on the upper surface of the light-emitting substrate (110) can be formed to be different from each other. In other words, the size of the first light-emitting element (200) can be formed to be larger than the size of the second light-emitting element (300). For example, the sum of the areas of the plurality of first light-emitting elements (200) can be formed to be larger than twice the sum of the areas of the plurality of second light-emitting elements (300). The first light-emitting element (200) may include at least one first array in which a plurality of light-emitting elements extend in a first direction, and the second light-emitting element (300) may include at least one second array in which a plurality of light-emitting elements extend in the first direction, and the first array of the first light-emitting elements (200) and the second array of the second light-emitting elements (300) may be arranged in parallel. The first light-emitting elements (200) and the second light-emitting elements (300) may be arranged in a second direction (for example, a vertical direction) perpendicular to the first direction (for example, a horizontal direction). The number of light-emitting elements included in the first array of the first light-emitting elements (200) extending in the first direction may be the same as the number of light-emitting elements included in the second array of the second light-emitting elements (300) extending in the first direction. Therefore, a high light quantity can be secured.

[0061] In addition, the light-emitting substrate (110) may be placed on the pad substrate (120). When the light-emitting substrate (110) is placed on the upper surface of the pad substrate (120), it may be interposed between the first pad (610) and the second pad (620), which will be described later. In addition, the light-emitting substrate (110) may be spaced apart from the first pad (610) and the second pad (620) on a plane.

[0062] The light-emitting substrate (110) may be formed to protrude upward from the surface of the pad substrate (120) so that its upper surface is positioned higher than the upper surface of the pad substrate (120). Meanwhile, although the present specification describes that the light-emitting substrate (110) is positioned on the upper side of the pad substrate (120), when the light-emitting device (1) of the present invention is mounted on a vehicle lamp, the light-emitting substrate (110) may be positioned in front of the pad substrate (120).

[0063] The light-emitting substrate (110) may be formed smaller than the pad substrate (120). At least a portion of the edge of the light-emitting substrate (110) may be disposed on the inner side of the edge of the pad substrate (120) on a plane. The light-emitting substrate (110) may be a ceramic substrate such as alumina (Al2O3), aluminum nitride (AlN), Zirconia Toughened Alumina (ZTA), FR1, CEM-1, FR-4, a printed circuit board (PCB), or a conductive substrate, but is not limited thereto.

[0064] FIG. 4 is a schematic plan view showing a plurality of first light-emitting bodies, a plurality of second light-emitting bodies, and a plurality of pads of a light-emitting device according to a first embodiment of the present invention, and FIG. 5 is a schematic drawing showing an enlarged portion B of FIG. 4.

[0065] Referring further to FIGS. 4 and 5, the length of the light-emitting substrate (110) in the first direction may be formed to be greater than the length in the second direction perpendicular to the first direction. A first region (111) and a second region (112) may be formed in the light-emitting substrate (110).

[0066] The first region (111) may be a region in which a plurality of first light-emitting elements (200) are arranged. The first length of the first region (111) in the first direction may be a length from one side of a first light-emitting element (200) adjacent to one side of a light-emitting substrate (110) among the plurality of first light-emitting elements (200) to the other side of a first light-emitting element (200) arranged adjacent to the other side of the light-emitting substrate (110). The first length of the first region (111) may be smaller than the second length of the second region (112) in the first direction.

[0067] The distance from one side of the first region (111) to the side (edge) of the light-emitting substrate (110) based on the first direction may be greater than the length from one side of the second region (112) to the side (edge) of the light-emitting substrate (110). In addition, the first region (111) may be arranged so that, when projected toward the second region (112), both sides of the first region (111) are arranged on the inner side of both sides of the second region (112).

[0068] In addition, the first region (111) may include a plurality of upper element regions (111a, 111b). The plurality of upper element regions (111a, 111b) may be arranged in the second direction. The plurality of upper element regions (111a, 111b) may include a first upper element region (111a) and a second upper element region (111b).

[0069] The first upper device region (111a) may be a region where a plurality of first upper devices (210) are arranged. The first upper device region (111a) may be located between the second upper device region (111b) and the second light-emitting device (300). The length (G) of the first upper device region (111a) in the first direction may be a length from one side of the first upper device (210) arranged adjacent to one side of the light-emitting substrate (110) among the plurality of first upper devices (210) to the other side of the first upper device (210) arranged adjacent to the other side of the light-emitting substrate (110). The length (G) of the first upper device region (111a) in the first direction may be greater than the length (F) of the second upper device region (111b) in the first direction. Additionally, the length (J) of the first upper element region (111a) in the second direction may be substantially equal to the length (d) of the first upper element (210) in the second direction, the length (K) of the second upper element region (111a) in the second direction, and the length (d) of the second upper element (220) in the second direction.

[0070] The second upper element region (111b) may be an area where a plurality of second upper elements (220) are arranged. The second upper element region (111b) may be arranged further from the second light-emitting element (300) in the second direction (vertical direction) than the first upper element region (111a). The length (F) of the second upper element region (111b) in the first direction may be a length from one side of the second upper element (220) adjacent to one side of the light-emitting substrate (110) among the plurality of second upper elements (220) to the other side of the second upper element (220) arranged adjacent to the other side of the light-emitting substrate (110). When this second upper element region (111b) is projected onto the first upper element region (111a), the second upper element region (111b) can be arranged on the inside of the first upper element region (111a). In other words, when the second upper element region (111b) is projected onto the first upper element region (111a), both ends of the second upper element region (111b) can be arranged on the inside of both ends of the first upper element region (111a). The length (K) of the second upper element region (111b) in the second direction can be the same as the length (d) of the second upper element (220) in the second direction.

[0071] The second region (112) may be a region in which a plurality of second light-emitting elements (300) are arranged. The length of the second region (112) in the first direction may be a length from one side of a second light-emitting element (300) adjacent to one side of the light-emitting substrate (110) among the plurality of second light-emitting elements (300) to the other side of a second light-emitting element (300) arranged adjacent to the other side of the light-emitting substrate (110). The area of ​​the second region (112) may be smaller than the area of ​​the first region (111).

[0072] The second region (112) may include a plurality of sub-regions. The plurality of sub-regions may be arranged in the second direction. The plurality of sub-regions may include a first sub-region (112a) and a second sub-region (112b).

[0073] The first sub-element region (112a) may be a region in which a plurality of first sub-elements (310) are arranged. The first sub-element region (112a) may be arranged further from the first light-emitting element (200) in the second direction (vertical direction) than the second sub-element region (112b). The length (I) of the first sub-element region (112a) in the first direction may be a length from one side of the first sub-element (310) arranged adjacent to one side of the light-emitting substrate (110) among the plurality of first sub-elements (310) to the other side of the first sub-element (310) arranged adjacent to the other side of the light-emitting substrate (110). The length (I) of the first sub-element region (112a) in the first direction may be the same as the length (I) of the second sub-element region (112b) in the first direction. Additionally, the length (N) of the first lower element region (112a) in the second direction may be the same as the length (M) of the second lower element region (112b) in the second direction. The length (N) of the first lower element region (112a) in the second direction may be smaller than the length (J) of the first upper element region (111a) in the second direction or the length (K) of the second upper element region (111b) in the second direction.

[0074] Meanwhile, the first upper element region (111a) and the second lower element region (112b) can also be expressed as in the following mathematical expression 1.

[0075]

[0076] In mathematical expression 1, H is a length (H) from one side (the lower side of the first upper element region (111a) in FIG. 5) of the edge of the first upper element region (111a) that is arranged opposite the second upper element region (111b) to the other side (the upper side of the second lower element region (112b) in FIG. 5) of the edge of the second lower element region (112b) that is arranged opposite the first lower element region (112a), based on the second direction. In other words, “H” may be a maximum distance in the second direction from one side of the upper element region (111a) that is arranged closest to the second region (112) among the plurality of upper element regions to one side of the lower element region (112a) that is arranged closest to the first region (111) among the plurality of lower element regions. “I” is the length (I) of the second lower element region (112b) in the first direction, and “G” is the length (G) of the first upper element region (111a) in the first direction. Accordingly, when the light-emitting device (1) is turned on, a shape in which the light pattern gradually narrows or widens can be implemented.

[0077] The pad substrate (120) can support a plurality of pads (600) including a light-emitting substrate (110) and a first pad (610) and a second pad (620). When a heat sink (500) is additionally arranged, the pad substrate (120) can be arranged between the light-emitting substrate (110) and the heat sink (500). In other words, the light-emitting substrate (110), the first pad (610), and the second pad (620) can be arranged on one side of the pad substrate (120). A heat sink (500) can be arranged under the pad substrate (120).

[0078] In a plane, the area of ​​the pad substrate (120) may be larger than the area of ​​the light-emitting substrate (110). In other words, in a plane, the edge of the light-emitting substrate (110) may be arranged on the inner side of the edge of the pad substrate (120). In addition, the area of ​​the pad substrate (120) may be smaller than the area of ​​the heat sink (500). In other words, in a plane, the edge of the pad substrate (120) may be arranged on the inner side of the edge of the heat sink (500). In addition, the length of the pad substrate (120) in the second direction may be larger than the length of the light-emitting substrate (110) in the second direction. The pad substrate (120) may be a ceramic substrate such as alumina (Al2O3), aluminum nitride (AlN), or Zirconia Toughened Alumina (ZTA), but is not limited thereto.

[0079] The first light-emitting element (200) can be arranged on the light-emitting substrate (110) to generate light. When the first light-emitting element (200) is mounted on a lamp, the first light-emitting element (200) can be arranged lower than the second light-emitting element (300), and the light can be flipped upside down or refracted upward while passing through the lens of the lamp. The first light-emitting element (200) can reach a longer distance than the light emitted from the second light-emitting element (300) and can form a different beam pattern from the light emitted from the second light-emitting element (300). When the same current is applied to the first light-emitting element (200) and the second light-emitting element (300), the light quantity of the first light-emitting element (200) can be formed to be greater than the light quantity of the second light-emitting element (300). The first light-emitting elements (200) may be formed in a plurality and arranged in a first region (111) while being spaced apart from each other in a first direction. The interval between the plurality of first light-emitting elements (200) may be smaller than the interval between the plurality of pads (600) arranged adjacent to each other. Therefore, the on / off areas of the light-emitting elements may be controlled without causing electrical short-circuiting. The number of the plurality of first light-emitting elements (200) may be smaller than the number of the plurality of second light-emitting elements (300).

[0080] The size of each of the plurality of first light-emitting elements (200) may be larger than the size of each of the plurality of second light-emitting elements (300) in a plane. On the other hand, the sum of the areas of the plurality of first light-emitting elements (200) may be larger than twice the sum of the areas of the plurality of second light-emitting elements (300). The length (c) of the first light-emitting element (200) in the first direction may be smaller than the length (d) of the first light-emitting element (200) in the second direction. The length (d) of the first light-emitting element (200) in the second direction may be larger than the length (a) of the second light-emitting element (300) in the first direction. The ratio of the length (d) of the first light-emitting element (200) in the second direction to the length (c) of the first light-emitting element (200) in the first direction may be greater than the ratio of the length (b) of the second light-emitting element (300) in the second direction to the length (a) of the second light-emitting element (300) in the first direction. The sizes of the first light-emitting element (200) and the second light-emitting element (300) may be as shown in Mathematical Expression 2 below.

[0081]

[0082] In mathematical expression 2, a is the length of the second light-emitting element (300) in the first direction, b is the length of the second light-emitting element (300) in the second direction, c is the length of the first light-emitting element (200) in the first direction, and d is the length of the first light-emitting element (200) in the second direction. Therefore, by arranging multiple light-emitting element areas with different ratios, the distance and light intensity at which light is irradiated can be delicately controlled.

[0083] The contrast ratio of the light-emitting device may be 150 or more. The contrast ratio may be calculated by comparing the light amounts of a plurality of adjacent first light-emitting elements (200). For example, one of the plurality of adjacent first light-emitting elements (200) may be a first adjacent light-emitting element (P1), and another of the plurality of first light-emitting elements (200) may be a second adjacent light-emitting element (P2). When the first adjacent light-emitting element (P1) is turned off and the second adjacent light-emitting element (P2) is turned on, the contrast ratio of the light-emitting device may be a value obtained by dividing the measured luminance (Luminance) (W2) of the second adjacent light-emitting element (P2) by the measured luminance (W1) of the first adjacent light-emitting element (P1). That is, W2 / W1 may be 150 or more.

[0084] As illustrated in FIG. 2, each of the plurality of first light-emitting elements (200) may include a first light source (200a) and a first wavelength conversion layer (200b). For example, the first light source (200a) may be disposed on the light-emitting substrate (110), and the first wavelength conversion layer (200b) may be disposed on the first light source (200a).

[0085] The first light source (200a) can generate light. The first light source (200a) can be electrically connected to the light-emitting substrate (110). The length of the first light source (200a) in the first direction (horizontal direction in FIG. 2) can be smaller than the length of the first wavelength conversion layer (200b) in the first direction. The first light source (200a) can include a first conductive semiconductor layer, an active layer, and a second conductive semiconductor layer.

[0086] The first conductive semiconductor layer may include a p-type impurity (e.g., Mg, Sr, Ba). In other words, the first conductive semiconductor layer may be a p-type semiconductor layer. However, this is merely an example, and the first conductive semiconductor layer may also include an n-type impurity. In addition, the first conductive semiconductor layer may be electrically connected to the light-emitting substrate (110).

[0087] The active layer may be disposed 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. Additionally, the first conductive semiconductor layer and the active layer may form a mesa.

[0088] The second conductive semiconductor layer may include an n-type impurity (e.g., Si, Ge, Sn). This second conductive semiconductor layer may be an n-type semiconductor layer. However, this is merely an example, and the second conductive semiconductor layer may also include a p-type impurity. In addition, the second conductive semiconductor layer may be electrically connected to the light-emitting substrate (110).

[0089] The first wavelength conversion layer (200b) may include a material or configuration for diffusing light generated from the first light source (200a) or changing the wavelength of the light. The first wavelength conversion layer (200b) may be disposed above the first light source (200a). In addition, the first wavelength conversion layer (200b) may include a wavelength conversion material, such as a phosphor, a quantum dot (QD), or an organic dye, which may convert the wavelength of light emitted from the first light source (200a). For example, the wavelength conversion material may include a fluorescent material capable of emitting one or more of red light, blue light, and green light. As an example, the first wavelength conversion layer (200b) may be formed in a rectangular shape. When the first wavelength conversion layer (200b) is formed in a square shape, the thickness of the reflection layer (400) can be easily formed, and cracks can be prevented from forming in the reflection layer (400). As another example, the first wavelength conversion layer (200b) can be formed in a shape in which the width increases upward. By means of this first wavelength conversion layer (200b), the light emitted from adjacent light-emitting elements can overlap each other, thereby eliminating dark areas.

[0090] The plurality of first light-emitting elements (200) may include a plurality of first upper elements (210) and a plurality of second upper elements (220).

[0091] A plurality of first upper elements (210) may be arranged between a plurality of second upper elements (220) and a plurality of second light-emitting elements (300). In other words, the plurality of first upper elements (210) may be light-emitting elements arranged between a plurality of second upper elements (220) and a plurality of second light-emitting elements (300) among the plurality of first light-emitting elements (200). The plurality of first upper elements (210) may be arranged in the first upper element region (111a). The number of the plurality of first upper elements (210) may be greater than the number of the plurality of second upper elements (220). In other words, with respect to the first direction (horizontal direction in FIG. 5), the distance (L1) from one side of the first upper element (210) arranged close to the side of the light-emitting substrate (110) to the side of the light-emitting substrate (110) among the plurality of first upper elements (210) may be smaller than the distance (L2) from one side of the second upper element (220) arranged close to the side of the light-emitting substrate (110) to the side of the light-emitting substrate (110) among the plurality of second upper elements (220).

[0092] The plurality of second upper elements (220) may be spaced further apart from the plurality of second light-emitting elements (300) than the plurality of first upper elements (210). In other words, the plurality of second upper elements (220) may be light-emitting elements that are arranged in the first direction and spaced further apart from the plurality of second light-emitting elements (300) than the plurality of first upper elements (210) among the plurality of first light-emitting elements (200). The plurality of second upper elements (220) may be arranged in the second upper element region (111b). The number of the plurality of second upper elements (220) may be less than the number of the plurality of first upper elements (210).

[0093] The second light-emitting element (300) can be arranged on the light-emitting substrate (110) to generate light forward. When the light-emitting device (1) is mounted on a vehicle lamp, the second light-emitting element (300) can be arranged above the first light-emitting element (200), and light can be refracted downward when transmitted through the lens of the vehicle lamp. The second light-emitting element (300) can form a beam pattern different from the light emitted from the first light-emitting element (200). The second light-emitting element (300) can be formed in plurality and arranged to be spaced apart from each other in the first direction. The plurality of second light-emitting elements (300) can be arranged in the second region (112). The interval (gap) between the plurality of second light-emitting elements (300) can be smaller than the interval between the plurality of pads (600) arranged adjacent to each other in the first direction and the second direction. Therefore, the on / off areas of light-emitting elements can be controlled without causing electrical short-circuiting.

[0094] The sum of the areas of the plurality of second light-emitting elements (300) may be less than half of the sum of the areas of the plurality of first light-emitting elements (200).

[0095] The contrast ratio of each of the second light-emitting elements (300) may be 150 or more. The contrast ratio may be calculated by comparing the light amounts of a plurality of second light-emitting elements (300) that are adjacent to each other. For example, one of the plurality of second light-emitting elements (300) that are adjacent to each other may be a third adjacent light-emitting element (P3), and another of the plurality of second light-emitting elements (300) may be a fourth adjacent light-emitting element (P4). When the third adjacent light-emitting element (P3) is off and the fourth adjacent light-emitting element (P4) is on, the contrast ratio of the light-emitting device may be a value obtained by dividing the luminance (W4) measured above the fourth adjacent light-emitting element (P4) by the luminance (W3) measured above the third adjacent light-emitting element (P3). That is, W4 / W3 may be 150 or more.

[0096] Each of the plurality of second light-emitting elements (300) may include a second light source (300a) and a second wavelength conversion layer (300b). The second light source (300a) may be disposed on the light-emitting substrate (110), and the second wavelength conversion layer (300b) may be disposed on the second light source (300a).

[0097] The second light source (300a) can generate light. The second light source (300a) can be electrically connected to the light-emitting substrate (110). The length of the second light source (300a) in the first direction (horizontal direction in FIG. 2) can be smaller than the length of the second wavelength conversion layer (300b) in the first direction. The second light source (300a) can include a first conductive semiconductor layer, an active layer, and a second conductive semiconductor layer.

[0098] The first conductive semiconductor layer may include a p-type impurity (e.g., Mg, Sr, Ba). In other words, the first conductive semiconductor layer may be a p-type semiconductor layer. However, this is merely an example, and the first conductive semiconductor layer may also include an n-type impurity. In addition, the first conductive semiconductor layer may be electrically connected to the light-emitting substrate (110).

[0099] The active layer may be disposed 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. Additionally, the first conductive semiconductor layer and the active layer may form a mesa.

[0100] The second conductive semiconductor layer may include an n-type impurity (e.g., Si, Ge, Sn). This second conductive semiconductor layer may be an n-type semiconductor layer. However, this is merely an example, and the second conductive semiconductor layer may also include a p-type impurity. In addition, the second conductive semiconductor layer may be electrically connected to the light-emitting substrate (110).

[0101] The second wavelength conversion layer (300b) may include a material or configuration for diffusing light generated from the second light source (300a) or changing the wavelength of the light. The second wavelength conversion layer (300b) may be disposed above the second light source (300a). In addition, the second wavelength conversion layer (300b) may include a wavelength conversion material, such as a phosphor, a quantum dot (QD), or an organic dye, which may convert the wavelength of light emitted from the second light source (300a). For example, the wavelength conversion material may include a fluorescent material capable of emitting one or more of red light, blue light, and green light. As an example, the second wavelength conversion layer (300b) may be formed in a rectangular shape. When the second wavelength conversion layer (300b) is formed in a square shape, the thickness of the reflective layer (400) can be easily formed, and cracks can be prevented from forming in the reflective layer (400). As another example, the second wavelength conversion layer (300b) can be formed in a shape in which the width increases upward. By means of this second wavelength conversion layer (300b), the light emitted from adjacent light-emitting elements can overlap each other, thereby eliminating dark areas.

[0102] The plurality of second light-emitting elements (300) may include a plurality of first sub-elements (310) and a plurality of second sub-elements (320).

[0103] The plurality of first sub-elements (310) may be spaced further apart from the first light-emitting element (200) than the plurality of second sub-elements (320). The plurality of first sub-elements (310) may be arranged in the first sub-element region (112a). The plurality of second sub-elements (320) may be arranged in the second sub-element region (112b). In other words, the plurality of first sub-elements (310) may be light-emitting elements arranged on the upper side among the plurality of second light-emitting elements (300).

[0104] The number of these plurality of first sub-elements (310) may be the same as the number of the plurality of second sub-elements (320), but is not limited thereto. Meanwhile, the plurality of first sub-elements (310) and the plurality of second sub-elements (320) may generate light to form a beam pattern of the same shape, but is not limited thereto, and may generate light to form beam patterns of different shapes.

[0105] A plurality of second lower elements (320) may be arranged between a plurality of first lower elements (310) and a first light-emitting element (200). The plurality of second lower elements (320) may be light-emitting elements arranged between a plurality of first lower elements (310) and a first light-emitting element (200) among the plurality of second light-emitting elements (300). The plurality of second lower elements (320) may be arranged in the second lower element region (112b). In other words, the plurality of second lower elements (320) may be arranged between a plurality of first lower elements (310) and a plurality of first upper elements (210).

[0106] Meanwhile, the diagonal length of the first light-emitting element (200) may be greater than the diagonal length of the second light-emitting element (300). The diagonal length of the first light-emitting element (200) may be expressed as in mathematical expression 3 below.

[0107]

[0108] In mathematical expression 3, “p” may be a first vertex length (p) from a first vertex of any one of the plurality of first upper elements (210) arranged closest to the side surface of the light-emitting substrate (110) to a second vertex of any one of the plurality of second lower elements (320) arranged closest to the side surface of the light-emitting substrate (110). In addition, the first vertex length (p) from the first vertex to the second vertex may be a length for the longest distance among the distances between any one of the first upper elements (210) where the first vertex is formed and the second lower element (320) where the second vertex is formed. In addition, “a” is a length (a) of the second light-emitting element (300) in the first direction, and “d” is a length (d) of the first light-emitting element (200) in the second direction. In other words, the first vertex length (p) can be formed to be greater than the diagonal length of the first light-emitting element (200), and the light-emitting device (1) can form a high beam pattern, but is not limited thereto.

[0109] Additionally, the first vertex length (p) can be expressed as in mathematical equation 4 below.

[0110]

[0111] “g” may be a second vertex length (g) from the first vertex to any one third vertex among the plurality of second upper elements (220) arranged closest to the side surface of the light emitting substrate (110). In addition, the second vertex length (g) may be a length for the longest distance among the distances between any one first upper element (210) in which the first vertex is formed and the second upper element (220) in which the third vertex is formed. In other words, the first vertex length (p) may be formed to be smaller than the second vertex length (g).

[0112] Additionally, the first vertex length (p) and the first upper element (210) can form a predetermined first angle (θ1), and the second vertex length (g) and the second upper element (220) can form a predetermined second angle (θ2). The first angle (θ1) can be smaller than the second angle (θ2).

[0113] Figure 6 is a schematic graph showing the luminance deviation of a light emitting device according to the first embodiment of the present invention.

[0114] Referring further to FIG. 6, when light is emitted only from a plurality of first upper elements, or only from a plurality of second upper elements, or only from a first lower element, or only from a second lower element, the deviation of luminance in the first direction can be formed to be 30% or less.

[0115] The reflective layer (400) is disposed on the surface of the light-emitting substrate (110) and can reflect light generated from the plurality of first light-emitting elements (200) and the plurality of second light-emitting elements (300). The reflective layer (400) can improve the surface light-emitting effect of the light-emitting device (1) by reflecting light generated from the plurality of first light-emitting elements (200) and the plurality of second light-emitting elements (300). The reflective layer (400) can be disposed on the light-emitting substrate (110) so as to cover the peripheral surfaces of the plurality of first light-emitting elements (200) and the peripheral surfaces of the plurality of second light-emitting elements (300) on a plane. For example, the reflective layer (400) can be made of aluminum, silicon, carbon, or the like.

[0116] Although not shown, the reflective layer (400) may be a mirror surrounding each of the plurality of first light-emitting elements (200) and the plurality of second light-emitting elements (300). The mirror may include a light-reflective material. When the light-emitting elements (200, 300) include a semiconductor layer and a phosphor layer, the mirror may surround side surfaces of the semiconductor layer and the phosphor layer. The mirrors surrounding each of the light-emitting elements (200, 300) may be spaced apart from each other with a gap between them. Therefore, cold air can contact the mirrors through the gap, and the light-emitting elements (200, 300) can be cooled, thereby increasing reliability. The mirror may have a wider upper region close to the light-extracting surface than a lower region close to the light-emitting substrate (110). In addition, since the mirror may have a step, the surface area that can be in contact with air can be increased, and a sufficient light-extracting area can be secured.

[0117] A heat sink (500) can support a pad substrate (120) and dissipate heat from the pad substrate (120). In addition, the heat sink (500) can dissipate heat generated from a plurality of first light-emitting elements (200) and a plurality of second light-emitting elements (300). The heat sink (500) can transfer heat to the outside and can improve the reliability of the light-emitting device (1) by lowering the thermal resistance of the light-emitting device (1). In addition, the heat sink (500) can support a plurality of controllers (800).

[0118] FIG. 7 is a schematic diagram showing a plurality of first light-emitting elements and a plurality of second light-emitting elements of a light-emitting device according to a first embodiment of the present invention electrically connected to a plurality of pads.

[0119] Referring further to FIG. 7, a plurality of pads (600) are formed and supported on the substrate unit (100), and can be electrically connected to a plurality of first light-emitting elements (200) and a plurality of second light-emitting elements (300). The plurality of pads (600) can include a plurality of first pads (610) and a plurality of second pads (620).

[0120] A plurality of first pads (610) can be electrically connected to a plurality of first light-emitting elements (200). When the plurality of first pads (610) and the plurality of first light-emitting elements (200) are electrically connected, the plurality of first light-emitting elements (200) can be grouped into a plurality of upper groups. In other words, some of the plurality of first light-emitting elements (200) can be grouped into a first upper group (S1) by being electrically connected to some of the plurality of first pads (610), and other of the plurality of first light-emitting elements (200) can be grouped into a second upper group (S2) by being electrically connected to other of the plurality of first pads (610). The first upper group (S1) may be a group adjacent to the side of the pad substrate (120) among the plurality of upper groups, and the second upper group (S2) may be a group adjacent to the center of the pad substrate (120) among the plurality of upper groups. For example, the first upper group (S1) may be formed when pads C01, C02, C03, and C04 are each electrically connected to a plurality of first light-emitting elements (200). In addition, the second upper group (S2) may be formed when pads C14, C15, and C16 are each electrically connected to a plurality of first light-emitting elements (200).

[0121] At this time, the number of the plurality of first light-emitting elements (200) included in the first upper group (S1) may be greater than the number of the plurality of first light-emitting elements (200) included in the second upper group (S2). For example, the number of the first light-emitting elements (200) included in the upper group may increase as the upper group is spaced apart from the center of the pad substrate (120). In addition, the number of the first light-emitting elements (200) included in one upper group may be less than the number of first pads (610) electrically connected to one upper group.

[0122] The plurality of first pads (610) may include a plurality of first upper pads (611) and a plurality of second upper pads (612).

[0123] A plurality of second upper pads (612) may be arranged to be spaced apart from each other in the first direction (horizontal direction). The plurality of second upper pads (612) may be spaced further apart from the light emitting substrate (110) than the plurality of first upper pads (611). For example, the plurality of second upper pads (612) may include pads D01 to D30. The number of the plurality of first upper pads (611) may be less than the number of the plurality of second upper pads (612). At least some of the plurality of second upper pads (612) may be arranged to overlap the plurality of first upper pads (611) that are arranged adjacent to each other when projected in the second direction (vertical direction). In addition, the plurality of second upper pads (612) may be electrically connected to the plurality of first upper elements (210) to group the first upper elements (210) into a plurality of upper groups.

[0124] A plurality of first upper pads (611) may be spaced apart from each other in the first direction. The plurality of first upper pads (611) may be arranged between a plurality of second upper pads (612) and the light emitting substrate (110). For example, the plurality of first upper pads (611) may include pads C01 to C26. The plurality of first upper pads (611) may be arranged to overlap a plurality of second upper pads (612) that are arranged adjacent to each other when projected in the second direction (vertical direction). In addition, the plurality of first upper pads (611) may be electrically connected to a plurality of second upper elements (220) to group the plurality of second upper elements (220) into a plurality of upper groups.

[0125] A plurality of second pads (620) can be electrically connected to a plurality of second light-emitting elements (300). As the plurality of second pads (620) and the plurality of second light-emitting elements (300) are electrically connected, the plurality of second light-emitting elements (300) can be grouped into a plurality of subgroups. In other words, some of the plurality of second light-emitting elements (300) can be grouped into a first subgroup (S3) by being electrically connected to some of the plurality of second pads (620), and other of the plurality of second light-emitting elements (300) can be grouped into a second subgroup (S4) by being electrically connected to other of the plurality of second pads (620). This first subgroup (S3) may be a group adjacent to the side of the pad substrate (120) among the plurality of subgroups, and the second subgroup (S4) may be a group adjacent to the center of the pad substrate (120) among the plurality of subgroups. For example, the first subgroup (S3) may be formed when the second pads A01, A02, A03, and A04 are electrically connected to the plurality of first sub-elements (310) of the second light-emitting element (300). In addition, the second subgroup (S4) may be formed when the second pads B15, B16, and B17 are electrically connected to the plurality of second sub-elements (320) of the second light-emitting element (300).

[0126] At this time, the number of the plurality of second light-emitting elements (300) included in the first subgroup (S3) may be greater than the number of the plurality of first light-emitting elements (200) included in the second upper group (S2). For example, the number of the second light-emitting elements (300) included in the subgroup may increase as the subgroups are spaced apart from the center of the pad substrate (120). In addition, the number of the second light-emitting elements (300) included in one subgroup may be less than the number of second pads (620) electrically connected to one subgroup.

[0127] The plurality of second pads (620) may include a plurality of first lower pads (621) and a plurality of second lower pads (622).

[0128] A plurality of first lower pads (621) may be spaced apart from each other in a first direction (horizontal direction). The plurality of first lower pads (621) may be arranged between a plurality of second lower pads (622) and the light emitting substrate (110) in a second direction (vertical direction). For example, the plurality of first lower pads (621) may include pads B01 to B34. The number of the plurality of first lower pads (621) may be the same as the number of the plurality of second lower pads (622). The number of the plurality of first lower pads (621) may be greater than the number of the plurality of first upper pads (611) and the number of the plurality of second upper pads (612). At least some of the plurality of first lower pads (621) may overlap a plurality of second lower pads (622) that are arranged adjacent to each other when projected in the second direction (vertical direction). Additionally, a plurality of first lower pads (621) can be electrically connected to a plurality of first lower elements (310) to group the first lower elements (310) into a plurality of lower groups.

[0129] The plurality of second lower pads (622) may be spaced apart from each other in the first direction (horizontal direction). The plurality of second lower pads (622) may be spaced further from the light emitting substrate (110) in the second direction (vertical direction) than the plurality of first lower pads (621). For example, the plurality of second lower pads (622) may include pads A01 to A34. At least some of the plurality of second lower pads (622) may overlap the plurality of first lower pads (621) that are arranged adjacent to each other when projected in the second direction (vertical direction). In addition, the plurality of second lower pads (622) may be electrically connected to the plurality of second lower elements (320) to group the plurality of second lower elements (320) into a plurality of subgroups. The number of the plurality of second lower pads (622) may be greater than the number of the plurality of first upper pads (611) and the number of the plurality of second upper pads (612).

[0130] FIG. 8 is a schematic diagram showing a bonding portion arranged on a pad of a light-emitting device according to the first embodiment of the present invention, and FIG. 9 is a schematic cross-sectional view of the bonding portion of FIG. 8 taken along line B-B'.

[0131] Referring further to FIGS. 8 and 9, the bonding portion (700) may be configured to electrically connect a plurality of controllers (800) and a plurality of pads (600) so that a plurality of first light-emitting elements (200) and a plurality of second light-emitting elements (300) are controlled. The bonding portion (700) may be arranged on each of the plurality of pads (600) so that a wire connects each of the plurality of controllers (800) and the plurality of pads (600). For example, the bonding portion (700) may be wire-bonded to any one of the plurality of pads (600) so that any one of the plurality of pads (600) and any one of the plurality of controllers (800) are electrically connected to each other by a wire. The bonding portion (700) may be formed to extend along the longitudinal direction of the pad (600). At least one of the one side and the other side opposite the one side of the plurality of bonding portions (700) is formed to be convex upward and can be positioned above the center of the bonding portion (700).

[0132] The controller (800) may be formed in a plurality of units and may be electrically connected to a plurality of pads (600) to control a plurality of first light-emitting elements (200) and a plurality of second light-emitting elements (300). The plurality of controllers (800) may independently control a plurality of upper groups and a plurality of lower groups. The plurality of controllers (800) may apply electricity to the plurality of first pads (610) so that light is generated in at least one of the plurality of upper groups. In addition, the plurality of controllers (800) may apply electricity to the plurality of second pads (620) so that light is generated in at least one of the plurality of lower groups. The plurality of controllers (800) may apply electricity to the plurality of first pads (610) so that the plurality of first light-emitting elements (200) included in each of the plurality of upper groups sequentially emit light.

[0133] For example, if each of the plurality of first upper elements (210) included in the first upper group is named a first upper sub-light emitting element, a second upper sub-light emitting element, and a third upper sub-light emitting element, the first upper sub-light emitting element may emit light when electricity is applied to pads C01 and C02, the second upper sub-light emitting element may emit light when electricity is applied to pads C02 and C03, and the third upper sub-light emitting element may emit light when electricity is applied to pads C03 and C04. In order to emit light in the first upper group, the controller (800) may apply electricity to pads C02 and C03 after applying electricity to pads C01 and C02, and may then apply electricity to pads C03 and C04. When electricity is applied to pads C01 and C02, electricity may not be applied to pads C03 and C04. When electricity is applied to pads C02 and C03, electricity may not be applied to pads C01 and C04. Also, when electricity is applied to pads C03 and C04, electricity may not be applied to pads C01 and C02.

[0134] Additionally, the plurality of controllers (800) can apply electricity to the plurality of second pads (620) so that the plurality of second light-emitting elements (300) included in each of the plurality of subgroups sequentially emit light.

[0135] For example, if each of the plurality of first sub-elements (310) included in the first sub-group is named a first sub-sub light-emitting element, a second sub-sub light-emitting element, and a third sub-sub light-emitting element, the first sub-sub light-emitting element may emit light when electricity is applied to pads B01 and B02, the second sub-light-emitting element may emit light when electricity is applied to pads B02 and B03, and the third sub-light-emitting element may emit light when electricity is applied to pads B03 and B04. In order to emit light in the first sub-group, the controller (800) may apply electricity to pads B02 and B03 after applying electricity to pads B01 and B02, and may then apply electricity to pads B03 and B04. When electricity is applied to pads B01 and B02, electricity may not be applied to pads B03 and B04. When electricity is applied to pads B02 and B03, electricity may not be applied to pads B01 and B04. Also, when electricity is applied to pads B03 and B04, electricity may not be applied to pads B01 and B02.

[0136] FIG. 10 is a schematic cross-sectional view of a light-emitting device according to a second embodiment of the present invention, and FIG. 11 is a schematic plan view showing a plurality of first light-emitting elements, a plurality of second light-emitting elements, and a plurality of pads of a light-emitting device according to a second embodiment of the present invention.

[0137] Hereinafter, a light emitting device (1) according to a second embodiment will be described with reference to FIGS. 10 and 11. In describing the second embodiment, there is a difference in that a dam (900) is further included and the substrate unit (100) further includes a substrate electrode (130). Therefore, the description will focus on these differences.

[0138] The substrate electrode (130) may be formed in multiple pieces and may be electrically connected to the first light-emitting element (200) or the second light-emitting element (300). The substrate electrode (130) may extend upward from the pad substrate (120) so as to be electrically connected to the first light-emitting element (200) or the second light-emitting element (300). In other words, the substrate electrode (130) may penetrate the light-emitting substrate (110). Hereinafter, the substrate electrode (130) electrically connected to the first upper element (210) is referred to as the first substrate electrode, and the substrate electrode (130) electrically connected to the second upper element (220) is referred to as the second substrate electrode. In addition, the substrate electrode (130) electrically connected to the first lower element (310) is referred to as a third substrate electrode, and the substrate electrode (130) electrically connected to the second lower element (320) is referred to as a fourth substrate electrode. The vertical lengths of the first substrate electrode and the fourth substrate electrode may be the same. The vertical lengths of the second substrate electrode and the third substrate electrode may be the same. The vertical direction may be a direction perpendicular to the first direction and the second direction. In addition, the upward direction may be a direction from the pad substrate (120) toward the first light-emitting element (200) and the second light-emitting element (300).

[0139] The vertical lengths of the first substrate electrode and the fourth substrate electrode may be greater than the vertical lengths of the second substrate electrode and the third substrate electrode. The lower sides of the first substrate electrode and the fourth substrate electrode may be positioned lower than the lower sides of the second substrate electrode and the third substrate electrode. Each of the plurality of substrate electrodes (130) may include an upper electrode (131), a lower electrode (132), and a connection electrode (133) disposed therebetween.

[0140] The upper electrode (131) may be disposed on the light-emitting substrate (110) and electrically connected to the first light-emitting element (200) or the second light-emitting element (300). In other words, the upper electrode (131) may be disposed on the lower side of the first light-emitting element (200) or the second light-emitting element (300). The upper electrode (131) may be disposed on the upper side of the light-emitting substrate (110) and may be exposed to the outside. In addition, the upper electrode (131) may be disposed above the pad (600). In other words, the pad (600) may be exposed to the outside from below the upper electrode (131). At least some of the upper electrodes (131) included in the plurality of substrate electrodes (130) may be disposed at the same height. Since a plurality of upper electrodes (131) can be arranged at the same height, it is possible to prevent any one of the first upper element (210), the second upper element (220), the first lower element (310), and the second lower element (320) from being arranged higher than any other one of the first upper element (210), the second upper element (220), the first lower element (310), and the second lower element (320). In addition, since a plurality of upper electrodes (131) can be arranged at the same height, the uniformity of the first light-emitting element and the second light-emitting element can be increased.

[0141] The distance (C1) between the upper electrode (131) and the lower surface of the pad substrate (120) may be greater than the distance (C2) between the lower surface of the pad substrate (120) and the lower surface of the pad (600). Since the first light-emitting element (200) and the second light-emitting element (300) can be arranged higher than the upper electrode (131) due to the distance (C1) between the upper electrode (131) and the lower surface of the pad substrate (120), the light extraction efficiency can be increased. In addition, since the distance between the pad (600) and the lower surface of the pad substrate (120) is formed short, the heat dissipation of the pad (600) can be increased by the heat sink (500) arranged on the lower surface of the pad substrate (120). In addition, deterioration of the pad (600) can be prevented, and the bonding portion (700) can be prevented from being detached from the pad (600) due to shrinkage and expansion.

[0142] Additionally, the upper electrode (131) may include a first upper electrode (131a), a second upper electrode (131b), a third upper electrode (131c), and a fourth upper electrode (131d).

[0143] The first upper electrode (131a) may be an electrode electrically connected to the first conductive semiconductor layer of the first light-emitting element (200). The second upper electrode (131b) may be an electrode electrically connected to the second conductive semiconductor layer of the first light-emitting element (200). The first upper electrode (131a) and the second upper electrode (131b) may be formed in multiple numbers and arranged in the first region (111).

[0144] A plurality of first upper electrodes (131a) and second upper electrodes (131b) may be arranged alternately in the first direction in the first region (111). In other words, the first upper electrodes (131a) and the second upper electrodes (131b) may be arranged in a direction perpendicular to the longitudinal direction of the first light-emitting element (200) in the first region (111). The sizes of the first upper electrodes (131a) and the second upper electrodes (131b) may be formed larger than the sizes of the third upper electrodes (131c) and the fourth upper electrodes (131d). The lengths of the first upper electrodes (131a) and the second upper electrodes (131b) in the first direction (horizontal direction) may be the same as the lengths of the third upper electrodes (131c) and the fourth upper electrodes (131d) in the first direction. The lengths of the first upper electrode (131a) and the second upper electrode (131b) in the second direction (vertical direction) can be formed to be greater than the lengths of the third upper electrode (131c) and the fourth upper electrode (131d) in the second direction.

[0145] The third upper electrode (131c) may be an electrode electrically connected to the first conductive semiconductor layer of the second light-emitting element (300). The fourth upper electrode (131d) may be an electrode electrically connected to the second conductive semiconductor layer of the second light-emitting element (300). The third upper electrode (131c) and the fourth upper electrode (131d) may be formed in multiple numbers and arranged in the second region (112). The multiple third upper electrodes (131c) and the multiple fourth upper electrodes (131d) may be arranged alternately in the first direction in the second region (112). In other words, the third upper electrodes (131c) and the fourth upper electrodes (131d) may be arranged in a direction parallel to the long axis direction of the second light-emitting element (300) in the second region (112).

[0146] By the first upper electrode (131a), the second upper electrode (131b), the third upper electrode (131c), and the fourth upper electrode (131d), the degree of freedom in the arrangement of the light source can be increased depending on the circuit shape to be implemented.

[0147] The lower electrode (132) may be disposed on the substrate electrode (130). The lower electrode (132) may be disposed lower than the upper electrode (131). In addition, among the plurality of lower electrodes (132), the one disposed closer to the dam (900) may be disposed higher. The lower electrode (132) of the first substrate electrode and the lower electrode (132) of the fourth substrate electrode may be disposed lower than the lower electrode (132) of the second substrate electrode and the lower electrode (132) of the third substrate electrode. In other words, the lower electrode (132) of the second substrate electrode and the lower electrode (132) of the third substrate electrode, which are disposed closer to the dam (900), may be disposed higher than the lower electrode (132) of the first substrate electrode and the lower electrode (132) of the fourth substrate electrode. Since the heights of at least some of the plurality of lower electrodes (132) can be arranged differently, interference between the lower electrodes (132) can be minimized and short circuits can be prevented.

[0148] In addition, the distance between the lower electrode (132) of the first substrate electrode and the upper electrode (131) of the first substrate electrode may be the same as the distance between the lower electrode (132) of the fourth substrate electrode and the upper electrode (131) of the fourth substrate electrode. The distance between the lower electrode (132) of the second substrate electrode and the upper electrode (131) of the second substrate electrode may be the same as the distance between the lower electrode (132) of the third substrate electrode and the upper electrode (131) of the third substrate electrode. In addition, the lower electrode (132) may be arranged lower than the pad (600).

[0149] The connecting electrode (133) can extend in the vertical direction to electrically connect the upper electrode (131) and the lower electrode (132). The connecting electrode (133) can penetrate the light emitting substrate (110). The vertical lengths of the connecting electrode (133) of the first substrate electrode and the connecting electrode (133) of the fourth substrate electrode may be the same. The vertical lengths of the connecting electrode (133) of the second substrate electrode and the connecting electrode (133) of the third substrate electrode may be the same. The vertical lengths of the connecting electrode (133) of the first substrate electrode and the connecting electrode (133) of the fourth substrate electrode may be greater than the vertical lengths of the connecting electrode (133) of the second substrate electrode and the connecting electrode (133) of the third substrate electrode. By means of these connecting electrodes (133), the metal can be placed more in the center than at the edge of the light-emitting substrate (110), so that the heat dissipation efficiency of the center of the light-emitting substrate (110) can be increased, and the core strength of the light-emitting substrate (110) can be increased.

[0150] Meanwhile, the light emitting substrate (110) and the pad substrate (120) of the substrate unit (100) may be formed integrally, but are not limited thereto. In other words, the light emitting substrate (110) and the pad substrate (120) may be formed with different configurations and then bonded together. In addition, the long axis (length in the first direction) of the light emitting substrate (110) and the long axis (length in the first direction) of the pad substrate (120) may be the same on a plane. The short axis (length in the second direction) of the light emitting substrate (110) may be smaller than the short axis (length in the second direction) of the pad substrate (120).

[0151] The dam (900) may be arranged on the upper side of the light-emitting substrate (110). The dam (900) may prevent the reflective layer (400) from being separated from the light-emitting substrate (110). The dam (900) may be arranged on the edge of the light-emitting substrate (110). The dam (900) may extend along the long axis of the light-emitting substrate (110). The dam (900) may be formed of the same material as the reflective layer (400) so as to form a strong bond with the reflective layer (400), but is not limited thereto. In other words, the dam (900) and the reflective layer (400) may include different materials so as to have different thermal characteristics to prevent cracking due to thermal stress. The dam (900) may be formed so as to have a width that becomes narrower as it goes upward. For example, the upper surface of the dam (900) may be formed as a curved surface. The height of the upper end of the dam (900) may be equal to or lower than the height of the upper surface of the first light-emitting element (200) or the second light-emitting element (300). The curved surface of the dam (900) increases the light reflection effect in the dam (900) and disperses thermal stress. The dam (900) may include a first dam (910) and a second dam (920).

[0152] The first dam (910) can be placed between the first light-emitting element (200) and the first pad (610) on a plane. The first dam (910) can prevent the reflective layer (400) from falling toward the first pad (610).

[0153] The second dam (920) may be disposed between the second light-emitting element (300) and the second pad (620) on a plane. The second dam (920) may prevent the reflective layer (400) from falling toward the second pad (620). The first dam (910) and the second dam (920) may be disposed parallel to each other. The first dam (910) and the second dam (920) may prevent the light-emitting substrate (110) from being bent along the extension direction of the first dam (910) and the second dam (920).

[0154] The pad (600) may include a buried area disposed between the light-emitting substrate (110) and the pad substrate (120). In other words, at least a portion of the first upper pad (611) or the second lower pad (622) may be buried between the light-emitting substrate (110) and the pad substrate (120). The buried area may be disposed to overlap the first dam (910) or the second dam (920) when viewed in the vertical direction. The pad (600) may be prevented from being peeled off from the substrate unit (100) by this buried area. In addition, a distance (C3) from the upper surface of the pad (600) to the upper surface of the light-emitting substrate (110) may be greater than a distance (C2) from the lower surface of the pad substrate (120) to the lower surface of the pad (600). Since the buried area can be pressed toward the pad substrate (120) by the light-emitting substrate (110), the bonding force between the pad (600) and the substrate unit (100) can be increased. The upper surface of the pad (600) can be positioned above the lower electrode (132).

[0155] Fig. 12 is a schematic plan view of a substrate unit of a light emitting device according to a third embodiment of the present invention.

[0156] Hereinafter, a light emitting device (1) according to a third embodiment will be described with reference to FIG. 12. In describing the third embodiment, there is a difference in that a dummy pad (1000) is further included, and this difference will be mainly described.

[0157] The dummy pad (1000) may be arranged on the outer side of the plurality of first light-emitting elements (200). In other words, the dummy pad (1000) may be arranged on the light-emitting substrate (110) so as to be positioned on the outer side of the plurality of upper electrodes (131) on a plane. In addition, the dummy pad (1000) may be formed in multiple numbers. Any one of the plurality of dummy pads (1000) may be arranged so that, when projected onto the upper electrode (131) in the second direction, a portion thereof overlaps the first upper electrode (131a) and a portion thereof overlaps the second upper electrode (131b). By the dummy pad (1000), the heat dissipation efficiency of the light-emitting device (1) may be increased.

[0158] The length of the dummy pad (1000) in the first direction may be formed to be equal to or greater than the lengths of the first upper electrode (131a) and the second upper electrode (131b) in the first direction. In addition, the length of the dummy pad (1000) in the first direction may be equal to or greater than the lengths of the third upper electrode (131c) and the fourth upper electrode (131d) in the first direction. The length of the dummy pad (1000) in the second direction may be smaller than the lengths of the first upper electrode (131a) and the second upper electrode (131b) in the second direction. In addition, the length of the dummy pad (1000) in the second direction may be greater than the lengths of the third upper electrode (131c) and the fourth upper electrode (131d) in the second direction.

[0159] 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. A substrate unit including a light-emitting substrate; A plurality of first light-emitting elements arranged in a first direction on the light-emitting substrate and emitting light; and A plurality of second light-emitting elements are arranged in the first direction on the light-emitting substrate and generate light, The plurality of first light-emitting elements and the plurality of second light-emitting elements are arranged in a second direction perpendicular to the first direction, The size of each of the plurality of first light-emitting elements on the plane is larger than the size of each of the plurality of second light-emitting elements. Light-emitting device.

2. In paragraph 1, The ratio of the length of the second light-emitting element in the second direction to the length of the second light-emitting element in the first direction is smaller than the ratio of the length of the first light-emitting element in the second direction to the length of the first light-emitting element in the first direction. Light-emitting device.

3. In paragraph 1, The sum of the areas of the plurality of first light-emitting elements is greater than twice the sum of the areas of the plurality of second light-emitting elements. Light-emitting device.

4. In paragraph 1, The length of the first light-emitting element in the first direction is smaller than the length of the second light-emitting element in the second direction, The length of the first light-emitting element in the second direction is greater than the length of the second light-emitting element in the first direction. Light-emitting device.

5. In paragraph 1, Further comprising a reflective layer disposed on the light-emitting substrate and reflecting light generated from the plurality of first light-emitting elements and the plurality of second light-emitting elements. Light-emitting device.

6. In paragraph 5, The above reflective layer covers the peripheral surfaces of the plurality of first light-emitting elements and the peripheral surfaces of the plurality of second light-emitting elements. Light-emitting device.

7. A substrate unit including a light-emitting substrate; A plurality of first light-emitting elements that are supported and arranged in a first direction on the light-emitting substrate and generate light; and It includes a plurality of second light-emitting elements that are supported and arranged in a first direction on the light-emitting substrate and generate light, The above light emitting substrate, a first region in which the plurality of first light-emitting elements are arranged; and A second region including a plurality of second light-emitting elements, The length of the first region in the first direction is smaller than the length of the second region in the first direction. Light-emitting device.

8. In paragraph 8, The distance from one side of the first region to one side of the light-emitting substrate is greater than the distance from one side of the second region to one side of the light-emitting substrate. Light-emitting device.

9. In paragraph 7, The above plurality of first light-emitting elements are, a plurality of first upper elements; and comprising a plurality of second upper elements spaced further apart from the second light-emitting elements than the plurality of first upper elements; The first area above is, a first upper element area in which the plurality of first upper elements are listed; and A second upper element area including a plurality of second upper elements is included, The length of the first upper element region in the first direction is greater than the length of the second upper element region in the first direction. Light-emitting device.

10. In paragraph 9, The second upper element region is positioned on the inner side of the first upper element region when projected toward the first upper element region. Light-emitting device.

11. Substrate unit; A plurality of first light-emitting elements that are supported and arranged in a first direction on the substrate unit and generate light; A plurality of second light-emitting elements that are supported and arranged in a first direction on the substrate unit and generate light; and A plurality of pads are supported and arranged in a first direction on the substrate unit, and are electrically connected to the plurality of first light-emitting elements and the plurality of second light-emitting elements, The above substrate unit is, A light-emitting substrate supporting the plurality of first light-emitting elements and the second light-emitting elements; and It includes a pad substrate that supports the plurality of pads and the light-emitting substrate, The above light emitting substrate, Protruding upward from the pad substrate so that the surface is positioned above the surface of the pad substrate, Light-emitting device.

12. In paragraph 11, The vertical length of the above light-emitting substrate is greater than the vertical length of the above pad substrate. Light-emitting device.

13. In paragraph 11, The above multiple pads, a plurality of first pads spaced apart from each other and electrically connected to the plurality of first light-emitting elements; and A plurality of second pads are supported on the pad substrate and are spaced apart from each other and are electrically connected to the plurality of second light-emitting elements, The above light emitting substrate is disposed between the plurality of first pads and the plurality of second pads. Light-emitting device.

14. In paragraph 11, The number of the plurality of second pads and the number of the plurality of first pads are different, Light-emitting device.

15. In paragraph 11, The spacing between the plurality of pads is greater than the spacing between the plurality of first light-emitting elements and the spacing between the plurality of second light-emitting elements. Light-emitting device.

16. In paragraph 13, The above plurality of first pads, a plurality of first upper pads spaced apart from each other in the first direction; and A plurality of second upper pads spaced apart from each other in the first direction, but further apart from the light-emitting substrate than the plurality of first upper pads, At least a portion of the plurality of first upper pads is arranged so as to overlap the plurality of second upper pads arranged adjacent to each other when projected in a second direction perpendicular to the first direction. Light-emitting device.

17. In paragraph 11, The above plurality of second pads, a plurality of first lower pads spaced apart from each other in the first direction; and A plurality of second lower pads are spaced apart from each other in the first direction, and are arranged between the plurality of first lower pads and the light emitting substrate, At least some of the plurality of second lower pads are arranged so as to overlap the plurality of first lower pads arranged adjacent to each other when projected in a second direction perpendicular to the first direction. Light-emitting device.

18. In paragraph 11, Further comprising a heat sink that supports the pad substrate and dissipates heat from the pad substrate. Light-emitting device.

19. In paragraph 13, A plurality of controllers electrically connected to the plurality of pads for controlling the plurality of first light-emitting elements and the plurality of second light-emitting elements; and A plurality of bonding portions for electrically connecting the plurality of controllers and the plurality of pads, Light-emitting device.

20. In paragraph 19, At least one of the above bonding portions, one side and the other side opposite the one side, is formed to be convex upward, Light-emitting device.

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