Light-emitting device

Abstract

The present invention relates to a light-emitting device. The light-emitting device according to an embodiment of the present invention comprises a substrate, a light-emitting element; a first light-transmitting layer; and a first reflection unit. The light-emitting element is disposed on the substrate and can emit light. The first light-transmitting layer is disposed on the substrate so as to cover the light-emitting element, and can be formed of a material that transmits light emitted from the light-emitting element. The first reflection unit is disposed in at least a portion of a region of the upper surface of the first light-transmitting layer, and can reflect at least some light. In addition, a side surface of the first light-transmitting layer includes an inclined surface.

Description

Light-emitting device

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

[0002] Light-emitting diodes (LEDs) are inorganic semiconductor devices that emit light through the recombination of electrons and holes. Recently, LEDs have found wide-ranging applications in various fields, including display devices, vehicle lamps, and general lighting. Compared to conventional light sources, LEDs boast lower power consumption, longer lifespan, and faster response times. These advantages are rapidly replacing existing light sources.

[0003] The technical problem to be solved by the present invention is to propose a light-emitting device with improved side light-emitting efficiency.

[0004] The technical problem to be solved by the present invention is to propose a light-emitting device capable of controlling light-emitting characteristics.

[0005] The technical problem to be achieved by the present invention is to propose a structure of a light-emitting device that can improve reliability by delaying moisture penetration into the interior of the light-emitting device by increasing the length of the moisture penetration path.

[0006] The technical problem to be achieved by the present invention is to propose a structure of a light-emitting device that can reduce stress caused by external pressure and improve structural stability.

[0007] The technical problem to be achieved by the present invention is to propose a structure of a light-emitting device that can prevent discoloration of the light-emitting device by increasing light stability and increasing resistance to yellowing by using a reflector.

[0008] The technical problem to be achieved by the present invention is to propose a structure of a light-emitting device that can reduce the side light loss of a light-emitting element and improve the amount of light emitted to the outside.

[0009] The technical problem to be achieved by the present invention is to propose a structure of a light-emitting device having high color purity by reducing chromatic aberration of side light of a light-emitting element.

[0010] According to an embodiment of the present invention, a light-emitting device is provided, including a substrate, a light-emitting element, a first light-transmitting layer, and a first reflecting portion. The light-emitting element is disposed on the substrate and can emit light. The first light-transmitting layer is formed on the substrate to cover at least one surface of the light-emitting element, and can be made of a material that transmits the light. The first reflecting portion is formed to cover at least a portion of an upper surface of the first light-transmitting layer, and can reflect at least a portion of the light. In addition, the side surface of the first light-transmitting layer can include an inclined surface.

[0011] According to one embodiment, the light emission surface of the light emitting device may be a surface among the surfaces of the first light transmitting layer that is separated from the first reflective portion.

[0012] In one embodiment, the first light-transmitting layer has a lower angle formed by the side surface and the upper surface of the substrate, and the lower angle of the first light-transmitting layer may be an obtuse angle.

[0013] In addition, the first light-transmitting layer has an upper angle of the first light-transmitting layer formed by the side surface and the lower surface of the first reflective portion, and the lower angle of the first light-transmitting layer may be greater than the upper angle of the first light-transmitting layer.

[0014] In another embodiment, the first light-transmitting layer has a lower angle formed by the side surface and the upper surface of the substrate, and the lower angle of the first light-transmitting layer may be an acute angle.

[0015] In addition, the first light-transmitting layer has an upper angle of the first light-transmitting layer formed by the side surface and the lower surface of the first reflective portion, and the lower angle of the first light-transmitting layer may be greater than the upper angle of the first light-transmitting layer.

[0016] Additionally, unevenness may be formed on the side surface of the first light-transmitting layer.

[0017] The lower surface of the first reflective portion can be in close contact with the upper surface of the first light-transmitting layer.

[0018] In a right triangle formed by a hypotenuse formed by a side surface of the first light-transmitting layer, a base extended from a lower surface of the first light-transmitting layer, and a height extending vertically from the base and touching one end of the hypotenuse, the length of the base may be less than the length of the height.

[0019] The thickness of the first light-transmitting layer may be thicker than the thickness of the first reflective portion.

[0020] The thickness of the first light-transmitting layer may be thicker than the thickness of the substrate.

[0021] One side of the light-emitting element may have a side slope angle formed with respect to the upper surface of the substrate. In addition, the side of the first light-transmitting layer facing one side of the light-emitting element may have a lower angle formed with respect to the upper surface of the substrate. In this case, the side slope angle of the light-emitting element and the lower angle of the first light-transmitting layer may be different from each other.

[0022] For example, the side slope angle of the light-emitting element may be smaller than the lower angle of the first light-transmitting layer.

[0023] The upper surface of the first light-transmitting layer may include a concave region in a downward direction.

[0024] The first light-transmitting layer may have a height that decreases toward the center at least in part of the upper surface.

[0025] One area of ​​the first optically transparent layer may have a curvature.

[0026] The first extension angle formed by the tangent line of the upper surface of the first light-transmitting layer and the extension line of the upper surface of the substrate may become smaller from the outer side to the center of the first light-transmitting layer.

[0027] The angle of the first extension line at the center of the first light-transmitting layer may be 0 degrees.

[0028] A tangent line of the upper surface of the first light-transmitting layer may be parallel to the upper surface of the substrate at the center of the first light-transmitting layer.

[0029] The first reflective portion may include a convex region in a downward direction corresponding to the concave region of the upper surface of the first light-transmitting layer.

[0030] The above first reflector may include a region whose thickness gradually increases toward the center.

[0031] The second extension angle formed by the tangent line of the lower surface of the first reflector and the extension line of the upper surface of the substrate may become smaller from the outer side to the center of the first light-transmitting layer.

[0032] The above first reflector may have a maximum thickness in a region close to the upper surface of the light-emitting element.

[0033] The inclined surface of the first light-transmitting layer may be located in an upper region of the first light-transmitting layer and may include a first inclined surface adjacent to the first reflective portion.

[0034] The inclined surface of the first light-transmitting layer may have a different slope from the first inclined surface, and may further include a second inclined surface positioned between the first inclined surface and the substrate.

[0035] The first reflector may have an inclined surface. An angle formed by an extension of the inclined surface of the first reflector with the substrate may be smaller than an angle formed by the first inclined surface and the second inclined surface.

[0036] The above light-emitting device may further include a second reflector spaced apart from the light-emitting element.

[0037] The second reflective portion may be formed to be disposed on the inner side of the first light-transmitting layer and surround the light-emitting element.

[0038] The above light-emitting device may further include a second light-transmitting layer that transmits the light.

[0039] The light-emitting device may further include a third reflector covering at least one area of ​​a side surface of the first light-transmitting layer.

[0040] The third reflective portion may include an inner surface in contact with the first light-transmitting layer and an outer surface facing the inner surface. The angle of the outer surface of the third reflective portion may be greater than the angle of the inner surface of the third reflective portion.

[0041] The above first light-transmitting layer may have at least one area exposed to the outside.

[0042] According to another embodiment of the present invention, a light-emitting device may include a substrate, a light-emitting element, a first light-transmitting layer, a first reflecting portion, and a second reflecting portion. The light-emitting element is disposed on the substrate and may emit light. The first light-transmitting layer is formed on the substrate to cover the light-emitting element, and may be made of a material that transmits the light. The first reflecting portion is formed to cover at least a portion of an upper surface of the first light-transmitting layer, and may reflect at least a portion of the light. The second reflecting portion may be formed on the substrate within the first light-transmitting layer and may be formed to surround a side surface of the light-emitting element. Here, the side surface of the first light-transmitting layer may be a main emission surface through which the light of the light-emitting element is emitted to the outside. The side surface of the first light-transmitting layer may include an inclined surface. In addition, the inner surface of the second reflecting portion and the side surface of the light-emitting element may be spaced apart from each other.

[0043] The second reflector can reflect some of the light and transmit some of the light.

[0044] The second reflector may include an inclined surface such that at least one of the inner and outer surfaces forms an acute angle with the lower surface of the second reflector.

[0045] The second reflector may include an inclined surface in which at least one of the inner and outer surfaces forms an obtuse angle with the lower surface of the substrate.

[0046] The second reflector may have a thickness that becomes thinner as the distance from the substrate increases. Here, the thickness of the second reflector is the distance between the upper surface and the lower surface.

[0047] The lower angle of the second reflector formed by the lower surface of the second reflector and the upper surface of the substrate may be different from the lower angle of the first light-transmitting layer formed by the side surface of the first light-transmitting layer and the upper surface of the substrate.

[0048] The second reflector may include a flat upper surface, and the flat upper surface may be parallel to a region of the first reflector.

[0049] The side surface of the first light-transmitting layer and the upper surface of the second reflective portion may form a first angle. In addition, the outer surface of the second reflective portion and the upper surface of the substrate may form a second angle. In this case, the difference between the first angle and the second angle may be less than 15 degrees.

[0050] The second reflector may include a first portion and a second portion having different heights from the substrate.

[0051] The first portion of the second reflective portion may be surrounded by the first light-transmitting layer.

[0052] The outer surface of the first portion of the second reflector has a third angle with the flat upper surface of the second reflector, and the third angle may be greater than the first angle.

[0053] The height of the second reflector may be higher than the height of the light-emitting element. Alternatively, depending on the embodiment, the height of the second reflector may be lower than the height of the light-emitting element. The heights of the second reflector and the light-emitting element may be defined in a direction away from the surface of the substrate.

[0054] The light-emitting device is formed in the inner space of the second reflector to cover the light-emitting element, and may further include a second light-transmitting layer that transmits the light.

[0055] The second light-transmitting layer may further include a filler.

[0056] The upper surface of the second light-transmitting layer may have a rough structure due to the filler.

[0057] The first light-transmitting layer has a lower angle formed by the side surface and the upper surface of the substrate, and the lower angle of the first light-transmitting layer may be an obtuse angle.

[0058] In addition, the first light-transmitting layer has an upper angle of the first light-transmitting layer formed by the side surface and the lower surface of the first reflective portion, and the lower angle of the first light-transmitting layer may be greater than the upper angle of the first light-transmitting layer.

[0059] Alternatively, the lower angle of the first light-transmitting layer may be an acute angle.

[0060] In addition, the first light-transmitting layer has an upper angle formed by the side surface and the lower surface of the first reflective portion, and the lower angle of the first light-transmitting layer may be smaller than the upper angle of the first light-transmitting layer.

[0061] A roughness may be formed on the side surface of the first light-transmitting layer.

[0062] The lower surface of the first reflective portion can be in close contact with the upper surface of the first light-transmitting layer.

[0063] One side of the light-emitting element may have a side slope angle formed with respect to the upper surface of the substrate. The side of the first light-transmitting layer facing one side of the light-emitting element may have a lower angle formed with respect to the upper surface of the substrate. In this case, the side slope angle of the light-emitting element and the lower angle of the first light-transmitting layer may be different from each other.

[0064] The upper surface of the first light-transmitting layer may include a concave region in a downward direction.

[0065] The first light-transmitting layer may have a height that decreases toward the center at least in part of the upper surface.

[0066] One area of ​​the first optically transparent layer may have a curvature.

[0067] The first reflective portion may include a convex region in a downward direction corresponding to the concave region of the upper surface of the first light-transmitting layer.

[0068] The angle between the tangent line of the lower surface of the first reflector and the extension line of the upper surface of the substrate may decrease from the outer side to the center of the first light-transmitting layer.

[0069] The above first reflector may have a maximum thickness in a region close to the upper surface of the light-emitting element.

[0070] The inclined surface of the first light-transmitting layer may be located in an upper region of the first light-transmitting layer and may include a first inclined surface adjacent to the first reflective portion.

[0071] The inclined surface of the first light-transmitting layer may have a different slope from the first inclined surface, and may further include a second inclined surface positioned between the first inclined surface and the substrate.

[0072] The light-emitting device may further include a third reflector covering at least one area of ​​a side surface of the first light-transmitting layer.

[0073] The above first light-transmitting layer may have at least one area exposed to the outside.

[0074] The exposed area of ​​the first optically transparent layer may have a slope.

[0075] According to an embodiment of the present invention, a light-emitting device is provided, which includes a substrate, a light-emitting element, a first light-transmitting layer, and a first reflecting portion. The light-emitting element is disposed on the substrate and can emit light. The first light-transmitting layer is formed on the substrate to cover at least one surface of the light-emitting element, and can be made of a material that transmits the light. The first reflecting portion is formed to cover at least a portion of an upper surface of the first light-transmitting layer, and can reflect at least a portion of the light. In addition, the side surface of the first light-transmitting layer can include a first inclined surface adjacent to the first reflecting portion, and a second inclined surface positioned between the first inclined surface and the substrate.

[0076] The first inclined surface and the first reflective surface may be obtuse angles.

[0077] The first inclined surface and the second inclined surface may be obtuse angles.

[0078] The angle formed by the extension of the inclined surface of the first reflector with the substrate may be smaller than the angle formed by the first inclined surface and the second inclined surface.

[0079] A roughness may be formed on the side surface of the first light-transmitting layer.

[0080] The lower surface of the first reflective portion can be in close contact with the upper surface of the first light-transmitting layer.

[0081] One side of the light-emitting element may have a side slope angle formed with respect to the upper surface of the substrate. In addition, the side of the first light-transmitting layer facing one side of the light-emitting element may have a lower angle formed with respect to the upper surface of the substrate. In this case, the side slope angle of the light-emitting element and the lower angle of the first light-transmitting layer may be different from each other.

[0082] The upper surface of the first light-transmitting layer may include a concave region in a downward direction.

[0083] One area of ​​the first optically transparent layer may have a curvature.

[0084] A tangent line of the upper surface of the first light-transmitting layer may be parallel to the upper surface of the substrate at the center of the first light-transmitting layer.

[0085] The first reflective portion may include a convex region in a downward direction corresponding to the concave region of the upper surface of the first light-transmitting layer.

[0086] The above first reflector may have a maximum thickness in a region close to the upper surface of the light-emitting element.

[0087] The above light-emitting device may further include a second reflector spaced apart from the light-emitting element.

[0088] The angle formed by the first inclined surface and the outer surface of the first reflective surface may be greater than the angle formed by the second reflective portion and the upper surface of the substrate.

[0089] The light-emitting device may further include a third reflector covering at least one area of ​​a side surface of the first light-transmitting layer.

[0090] The above first light-transmitting layer may have at least one area exposed to the outside.

[0091] According to an embodiment of the present invention, a light-emitting device is provided, which includes a substrate, a light-emitting element, a first light-transmitting layer, a first reflecting portion, and a third reflecting portion. The light-emitting element is disposed on the substrate and can emit light. The first light-transmitting layer is formed on the substrate to cover at least one surface of the light-emitting element, and can be made of a material that transmits the light. The first reflecting portion is formed to cover at least a portion of an upper surface of the first light-transmitting layer, and can reflect at least a portion of the light.

[0092] The third reflective portion may include an inner surface in contact with the first light-transmitting layer and an outer surface facing the inner surface. The angle of the outer surface of the third reflective portion may be greater than the angle of the inner surface of the third reflective portion.

[0093] The first optically transparent layer may include a first inclined surface adjacent to the first reflective portion and a second inclined surface positioned between the first inclined surface and the substrate.

[0094] The angle formed by the first inclined surface and the second inclined surface may be greater than the angle formed by the outer surface or the inner surface of the third reflector with the substrate.

[0095] The above first light-transmitting layer may have at least one area exposed to the outside.

[0096] A roughness may be formed on the side surface of the first light-transmitting layer.

[0097] One side of the light-emitting element may have a side slope angle with respect to the upper surface of the substrate.

[0098] The upper surface of the first light-transmitting layer may include a concave region in a downward direction.

[0099] One area of ​​the first optically transparent layer may have a curvature.

[0100] A tangent line of the upper surface of the first light-transmitting layer may be parallel to the substrate at the center of the first light-transmitting layer.

[0101] The first reflective portion may include a convex region in a downward direction corresponding to the concave region of the upper surface of the first light-transmitting layer.

[0102] The above light-emitting device may further include a second reflector spaced apart from the light-emitting element.

[0103] The light-emitting device is formed in the inner space of the second reflector to cover the light-emitting element, and may further include a second light-transmitting layer that transmits the light.

[0104] A light-emitting device according to an embodiment of the present invention can improve side emission and light extraction efficiency through a light-transmitting layer and a reflective portion.

[0105] A light-emitting device according to an embodiment of the present invention can control light-emitting characteristics by controlling a light-emitting area on the side.

[0106] A light-emitting device according to an embodiment of the present invention can improve reliability by delaying moisture penetration into the interior of the light-emitting device by increasing the length of a moisture penetration path.

[0107] A light-emitting device according to an embodiment of the present invention can reduce stress due to external pressure and improve structural stability.

[0108] A light-emitting device according to an embodiment of the present invention can prevent discoloration by increasing light stability and increasing resistance to yellowing by using a reflector.

[0109] A light-emitting device according to an embodiment of the present invention can reduce the side light loss of a light-emitting element and improve the amount of light emitted to the outside.

[0110] A light-emitting device according to an embodiment of the present invention can have high color purity by reducing chromatic aberration of side light of a light-emitting element.

[0111] FIG. 1 is a schematic diagram for explaining a light-emitting device according to a first embodiment of the present invention.

[0112] Figure 2 is a graph of a light distribution curve of a light emitting device according to a first embodiment of the present invention.

[0113] Figure 3 is a schematic diagram for explaining a device according to a second embodiment of the present invention.

[0114] Figure 4 is a graph of a light distribution curve of a light emitting device according to a second embodiment of the present invention.

[0115] Figure 5 is a schematic diagram for explaining a light-emitting device according to a third embodiment of the present invention.

[0116] Figure 6 is a vertical cross-sectional view of a light emitting device according to a fourth embodiment of the present invention.

[0117] Figure 7 is a horizontal cross-sectional view of a light emitting device according to a fourth embodiment of the present invention.

[0118] Fig. 8 is a graph of a light distribution curve of a light emitting device according to a fourth embodiment of the present invention.

[0119] Figure 9 is a schematic diagram for explaining a light-emitting device according to a fifth embodiment of the present invention.

[0120] Fig. 10 is a schematic diagram for explaining a light-emitting device according to a sixth embodiment of the present invention.

[0121] Fig. 11 is a schematic diagram for explaining a light-emitting device according to the seventh embodiment of the present invention.

[0122] Fig. 12 is a graph of a light distribution curve of a light emitting device according to the seventh embodiment of the present invention.

[0123] Fig. 13 is a schematic diagram for explaining a light-emitting device according to the eighth embodiment of the present invention.

[0124] Fig. 14 is a schematic diagram for explaining a light-emitting device according to the ninth embodiment of the present invention.

[0125] Figure 15 is a schematic diagram for explaining a light-emitting device according to the tenth embodiment of the present invention.

[0126] FIG. 16 is a schematic diagram for explaining a light-emitting device according to the eleventh embodiment of the present invention.

[0127] Figure 17 is a schematic diagram for explaining a light-emitting device according to the 12th embodiment of the present invention.

[0128] Fig. 18 is a schematic diagram for explaining a light-emitting device according to the 13th embodiment of the present invention.

[0129] Fig. 19 is a graph of a light distribution curve of a light emitting device according to the 13th embodiment of the present invention.

[0130] FIG. 20 is a schematic diagram for explaining a light-emitting device according to the 14th embodiment of the present invention.

[0131] Fig. 21 is a graph of a light distribution curve of a light emitting device according to the 14th embodiment of the present invention.

[0132] FIG. 22 is a schematic diagram for explaining a light-emitting device according to the 15th embodiment of the present invention.

[0133] FIG. 23 is a schematic drawing of a lighting device according to an embodiment of the present invention.

[0134] FIG. 24 is a schematic diagram illustrating a display device according to an embodiment of the present invention.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] When an element, such as a layer, is referred to as being "on," "connected to," or "joined to" another element or layer, the element may be directly on, connected to, or joined to the other element or layer, or there may be intervening elements or layers present. However, when an element or layer is referred to as being "directly on," "directly connected to," or "directly joined to" another element or layer, there are no intervening elements or layers present. For this purpose, the term "connected" may refer to physical, electrical, and / or fluidic connections, with or without intervening elements. Furthermore, the DR1-axis, DR2-axis, and DR3-axis are not limited to the three axes of a Cartesian coordinate system, such as the x, y, and z-axes, and may be interpreted in a broader sense. For example, the DR1-axis, DR2-axis, and DR3-axis may be perpendicular to one another, or may represent different directions that are not perpendicular to one another. For purposes of this disclosure, “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.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] 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.

[0143] 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.

[0144] 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.

[0145] Hereinafter, the light emitting device of the present invention will be described in detail through drawings.

[0146] FIG. 1 and FIG. 2 are drawings for explaining a light-emitting device according to a first embodiment of the present invention.

[0147] FIG. 1 is a schematic diagram for explaining a light-emitting device (100) according to a first embodiment of the present invention.

[0148] Referring to FIG. 1, a light-emitting device (100) according to the first embodiment includes a substrate (110), a light-emitting element (120), a light-transmitting layer (130), and a reflective portion (140).

[0149] The substrate (110) may include wiring electrically connected to the light-emitting element (120). The wiring of the substrate (110) may transmit power for the operation of the light-emitting element (120) to the light-emitting element (120). For example, the substrate (110) may be a printed circuit board including a base and wiring insulated from the base. For example, the base may be formed of various materials such as phenol, epoxy, AlN (Aluminum nitride) ceramic or Al2O3 ceramic, polymer, ABS (Acrylonitrile butadiene styrene), LCP (Liquid crystalline polymer), PI (Polyamide), PPS (Polyphenylene sulfide), TPE (Thermoplastic elastomer), and metal. In addition, the thermal conductivity of the substrate (110) may be about 170 W / (m·K).

[0150] Additionally, a reflective layer formed of a material that reflects light may be further formed on the upper surface of the substrate (110). For example, the reflective layer may be formed of a metal such as Cu, Ag, Au, or Al. Additionally, the reflective layer may be formed of an oxide such as TiO2, BaSO4, or Al2O3. Additionally, the reflective layer may be formed of any material that can reflect light, even if it is not a metal or an oxide.

[0151] The light-emitting element (120) is mounted on a substrate (110) and can emit light by receiving power through wiring of the substrate (110).

[0152] The light-emitting device (120) may include a semiconductor structure including an n-type semiconductor layer, an active layer, and a p-type semiconductor layer. The n-type semiconductor layer may be a conductive semiconductor layer including an n-type impurity, and the p-type semiconductor layer may be a conductive semiconductor layer including a p-type impurity. In addition, the active layer may be interposed between the n-type semiconductor layer and the p-type semiconductor layer and may include a multiple quantum well structure (MQW). For example, the light-emitting device (120) may be a light-emitting diode chip including a semiconductor structure.

[0153] In Figure 1, the y-axis direction is the direction in which semiconductor layers are stacked or the upper direction, and the x-axis direction is the lateral direction perpendicular to the y-axis.

[0154] The light transmitting layer (130) may be formed on the upper portion of the substrate (110) to cover the light emitting element (120). In addition, the light transmitting layer (130) may be formed of a light transmitting material. For example, the light transmitting layer (130) may be formed of a light transmitting resin such as an epoxy resin, a silicone resin, a fluororesin, etc. In addition, the light transmitting layer (130) may be formed of a light transmitting glass such as borosilicate glass, aluminum silicate glass, silicate glass, synthetic quartz glass, etc. In addition, the light transmitting layer (130) may be formed of a light transmitting ceramic. Accordingly, the light transmitting layer (130) may provide a path through which light is transmitted and progressed.

[0155] The light transmitting layer (130) can act as an optical lens that refracts light emitted from the light emitting element (120) to adjust the angle of incidence. In addition, the light transmitting layer (130) can cover the light emitting element (120) to protect the light emitting element (120) from external environments such as dust, moisture, and impact.

[0156] The reflective portion (140) is disposed on the light-transmitting layer (130). For example, the reflective portion (140) may be disposed to cover the entire upper surface of the light-transmitting layer (130). However, the structure in which the reflective portion (140) is disposed is not limited thereto. The reflective portion (140) may be disposed to cover only a portion of the upper region of the light-transmitting layer (130) depending on the light-emitting pattern of the light-emitting device (100).

[0157] The reflective portion (140) may be formed of a material that reflects light. The reflective portion (140) may reflect at least a portion of the light emitted from the light emitting element (120). More specifically, the reflective portion (140) may move within the light-transmitting layer (130) and reflect all or a portion of the light reaching the reflective portion (140). For example, the reflective portion (140) may be formed of a metal such as Ag, Al, Pt, or Au. Alternatively, the reflective portion (140) may be formed of an epoxy resin, silicone resin, glass, or ceramic in which a light-reflecting material is dispersed. For example, the light-reflecting material may be TiO2, Ba2Ti9O 20 , BaSO4, SiO2, CaCO3, ZnO, CaCO3, or anything that can reflect light. Alternatively, the reflector (140) may be a distributed bragg reflector (DBR) formed by stacking multiple layers, at least one of which has a different refractive index. Alternatively, the reflector (140) may be an omnidirectional reflector. Alternatively, the reflector (140) may be formed by including multiple of the above-described reflectors (140).

[0158] According to an embodiment of the present invention, a portion of the light emitted from the light emitting element (120) may be directed toward the reflective portion (140) and another portion may pass through the side surface of the light-transmitting layer (130) and be emitted to the outside of the light emitting device (100). A portion or all of the light directed toward the reflective portion (140) may be reflected by the reflective portion (140) and directed toward the side surface of the light-transmitting layer (130). According to one embodiment, the light emitted from the light emitting element (120) may be emitted from at least one surface of the light-transmitting layer (130) that is located away from the reflective portion (140). That is, the surfaces of the light-transmitting layer (130) that are located away from the reflective portion (140) may be the main light-emitting surface of the light emitting device (100). Accordingly, the light emitting device (100) of the present embodiment can emit most or all of the light emitted from the light emitting element (120) to the outside through the side surface of the light transmitting layer (130). In addition, the main emission surface of the light emitting device (100) of the present embodiment can be the side surface of the light transmitting layer (130). That is, the light emitting device (100) of the present embodiment can have a higher luminous intensity on the side surface, which is the main emission surface, than on the upper or lower surface.

[0159] In the light-emitting device (100) of the present embodiment, the side surface of the light-transmitting layer (130) as the main emission surface may be formed as an inclined surface. Referring to FIG. 1, the lower angle (θ1) formed by the side surface of the light-transmitting layer (130) and the lower surface of the light-transmitting layer (130) or the upper surface of the substrate (110) may be an obtuse angle. That is, the lower angle (θ1) of the light-transmitting layer (130) may be greater than 90 degrees. Furthermore, the lower angle (θ1) of the light-transmitting layer (130) may be greater than 90 degrees and less than or equal to 120 degrees. In this case, when the lower angle (θ1) of the light-transmitting layer (130) is an obtuse angle, the main emission path of light is directed in the side and lower directions. In this case, the light-emitting device (100) may have a wide light distribution curve.

[0160] In addition, the upper angle (θ2) formed by the side surface of the light transmitting layer (130) and the upper surface of the light transmitting layer or the lower surface of the reflective portion (140) may be an acute angle. Furthermore, the upper angle (θ2) of the light transmitting layer (130) may be 60 degrees or more and less than 90 degrees. In the present embodiment, the lower angle (θ1) and the upper angle (θ2) of the light transmitting layer (130) may be internal angles of the light transmitting layer (130).

[0161] In addition, a right triangle may be formed by a hypotenuse (c) formed as a side surface of the light transmitting layer (130), a base (a) extended from the lower surface of the light transmitting layer (130) or the upper surface of the substrate (110), and a height (b) extending vertically from the base (a) and touching one end of the hypotenuse (c). Here, the length of the base (a) may be smaller than the height (b). For example, the ratio of the length of the height (b) and the length of the base (a) may be 1.73 or more. In addition, the length of the base (a) may be smaller than the length of the hypotenuse (c). For example, the ratio of the length of the hypotenuse (c) and the length of the base (a) may be 0.5 or less.

[0162] In addition, one side of the light-emitting element (120) may have a slope. The side slope angle of one side of the light-emitting element (120) and the lower angle (θ1) of one side of the light-transmitting layer (130) opposite one side of the light-emitting element (120) may have different angles. Here, the side slope angle of the light-emitting element (120) may be an internal angle of the light-emitting element (120) formed by one side of the light-emitting element (120) and the upper surface of the substrate (110) or the lower surface of the light-emitting element (120). For example, the side slope angle of the light-emitting element (120) may be smaller than the lower angle (θ1) of the light-transmitting layer (130). In this case, light emitted from the side of the light-emitting element (120) can be efficiently emitted to the side of the light-emitting device (100). As another example, the side slope angle of the light-emitting element (120) may be greater than the lower angle (θ1) of the light-transmitting layer (130). In this case, light emitted from the side of the light-emitting element (120) can be efficiently emitted to the lower surface of the light-emitting device (100), thereby widening the light-direction angle of the light-emitting device (100).

[0163] Additionally, the light transmitting layer (130) may be thicker than the light emitting element (120), the reflective portion (140), or the substrate (110). In this case, a sufficient optical path is secured for the light emitted from the light emitting element (120) and the light reflected from the reflective portion (140) to travel to the side of the light transmitting layer (130), thereby improving the side light extraction efficiency of the light emitting device (100).

[0164] At least a portion of the light emitted from the light emitting element (120) and directed upward may be reflected from the reflector (140) and directed to the side.

[0165] At this time, if the side surface of the light transmitting layer (130) is a plane perpendicular to the lower surface, a portion of the light may be totally reflected from the side surface and may head toward the inside of the light transmitting layer (130). A portion of the light reflected from the side surface of the light transmitting layer (130) and heading toward the inside of the light transmitting layer (130) may be absorbed by the substrate (110) or reabsorbed by the light emitting element (120) and thus lost. In addition, another portion of the light reflected from the side surface of the light transmitting layer (130) and heading toward the inside of the light transmitting layer (130) may be absorbed by the boundary surface of the light transmitting layer (130) and components within the light transmitting layer (130) or may be lost due to continuous reflection.

[0166] Therefore, the light emitting device (100) according to the present embodiment can form the side surface of the light transmitting layer (130), which is the main emission surface, as an inclined surface, thereby reducing the light totally reflected from the side surface of the light transmitting layer (130). Therefore, the light emitting device (100) according to the present embodiment can form the side surface of the light transmitting layer (130) to have an inclined surface, thereby improving the light extraction efficiency, and further increasing the amount of light emitted in the side and downward directions, thereby improving the side light emission efficiency.

[0167] FIG. 2 is a graph of a light distribution curve of a light emitting device (100) according to a first embodiment of the present invention.

[0168] Radiation characteristics represent the distribution of light intensity emitted from a light source such as the light-emitting device of the present invention. That is, the radiation characteristics can be used to determine the directivity of the light source and the luminous intensity according to the angle or direction. In the present embodiment, the y-axis of the radiation characteristics can be the relative illuminance according to the angle of the light source, and the x-axis can be the radiation angle based on a point directly below the light source. Here, the relative illuminance can be expressed based on the highest illuminance.

[0169] Referring to FIG. 2, it can be seen that the light emitting device (100) according to the first embodiment emits most of the light in the direction of 45 to 90 degrees and -45 to -90 degrees rather than 45 to -45 degrees. Furthermore, if the area in which the relative luminance is 0.5 or more is defined as the main emission angle, the main emission angle of the light emitting device (100) of the present embodiment may be between -50 degrees and -100 degrees and between 50 degrees and 100 degrees. That is, the light emitting device (100) of the present embodiment has high luminance between 50 degrees and 100 degrees and between -50 degrees and -100 degrees. That is, the light emitting device (100) according to the first embodiment emits most of the light in the lateral direction rather than the upward direction.

[0170] That is, it can be confirmed that the light emitting device (100) according to the first embodiment has a relatively lower luminous intensity of front light in the y-axis direction than of side light in the x-axis direction. Furthermore, the light emitting device (100) according to the first embodiment has an illuminance or luminous intensity (luminous intensity) of less than 50% at a radiation angle of 0 degrees, but can have a luminous intensity of 50% or more at a radiation angle of 45 degrees or more or -45 degrees or less.

[0171] Also, referring to FIG. 2, the light-emitting device (100) according to the first embodiment can have low luminosity even at a radiation angle of -90 degrees or less or 90 degrees or more. For example, the light-emitting device (100) can have a luminosity of 10% or more at a radiation angle of -90 degrees or less or 90 degrees or more. This confirms that the light-emitting device (100) of the present embodiment can emit light in directions of +90 degrees or more and -90 degrees or less while improving the side light extraction efficiency.

[0172] In the various embodiments of the present invention described below, the same components as those in the previously described embodiments will be omitted or briefly described. Therefore, for detailed descriptions of the omitted or briefly described components, please refer to the descriptions in the previous embodiments.

[0173] Fig. 3 is a schematic diagram of a light-emitting device according to a second embodiment, and Fig. 4 is a light distribution curve graph of the light-emitting device according to the second embodiment of Fig. 3.

[0174] The light-emitting device (200) of FIG. 3 includes a substrate (110), a light-emitting element (120) disposed on the upper portion of the substrate (110), a light-transmitting layer (230) disposed to cover the light-emitting element (120), and a reflective portion (140) formed to cover the upper surface of the light-transmitting layer (230). At this time, the light-emitting device (200) may have unevenness formed on at least one area of ​​the side surface of the light-transmitting layer (230).

[0175] In the light-emitting device (200) of the present embodiment, light emitted upward from the light-emitting element (120) can be reflected by the reflector (140) and emitted to the outside through the side surface of the light-transmitting layer (230). At this time, the unevenness can diversify the angle of incidence of light at the side surface of the light-transmitting layer (230) to reduce total reflection of light, thereby improving the light extraction efficiency at the side surface of the light-transmitting layer (230).

[0176] The difference between the maximum height and the minimum height of the unevenness may be smaller than the thickness of the reflective portion (140). In addition, the difference between the maximum height and the minimum height of the unevenness may be smaller than the height of the light emitting element (120). The unevenness may be formed in a designed size through the mold and injection process of the light transmitting layer (230), or may be formed through a dicing process. In addition, when the light transmitting layer (230) includes a filler such as a reflective material, a wavelength conversion material, a light diffusing agent, etc., unevenness may be formed on the side surface of the light transmitting layer (230) by the filler. In this case, the unevenness of the light transmitting layer (230) may allow light to be emitted at one or more angles. That is, the slope of the emission surface of one region of the light transmitting layer (230) may be different from the slope of the emission surface of another adjacent region.

[0177] Referring to FIG. 4, it can be seen that the light emitting device (200 in FIG. 3) according to the second embodiment emits most of the light in the direction of about 30 degrees to about 60 degrees and about -30 degrees to -60 degrees.

[0178] Referring to Fig. 4, when the radiation angle is 0 degrees, the luminous intensity of the light-emitting device (200 in Fig. 3) may be less than 80%. That is, the luminous intensity in an area perpendicular to the light-emitting element (120 in Fig. 3) may have a luminous intensity of 80% of the maximum luminous intensity. Here, the area perpendicular to the light-emitting element (120 in Fig. 3) is an area located in a vertical direction based on the center of the horizontal cross-section of the light-emitting element (120 in Fig. 3). In addition, the luminous intensity when the radiation angle is 30 degrees to 60 degrees and -30 degrees to -60 degrees may be higher than the luminous intensity when the radiation angle is 0 degrees. In this way, the light-emitting device (200 in Fig. 3) emits more light in a lateral direction than in an upward direction.

[0179] In addition, looking at the light distribution curve of FIG. 4, the light distribution curve of the area corresponding to the light emitted from the side of the light-emitting device (200 of FIG. 3) may have a form that includes multiple peaks and valleys. That is, it includes multiple areas where the relative brightness is close to 1 due to the unevenness of the light-transmitting layer (230), and through this, it can be seen that the amount of light emitted through the side of the light-emitting element (200 of FIG. 3) has increased.

[0180] Figure 5 is a schematic diagram for explaining a light-emitting device according to a third embodiment of the present invention.

[0181] A light-emitting device (300) according to a third embodiment of the present invention includes a substrate (110), a light-emitting element (120), a light-transmitting layer (330), and a reflective portion (140). The substrate (110), the light-emitting element (120), and the reflective portion (140) of the light-emitting device (300) of the third embodiment are the same as the substrate (110), the light-emitting element (120), and the reflective portion (140) of the light-emitting device (100 of FIG. 1) of the first embodiment. However, the structure of the light-transmitting layer (330) of the light-emitting device (300) of the third embodiment is different from the structure of the light-transmitting layer (130) of the light-emitting device (100 of FIG. 1) of the first embodiment.

[0182] In the present embodiment, the light transmitting layer (330) is formed such that the side surface, which is the main emission surface of the light emitting device (300), is formed as an inclined surface. Referring to FIG. 5, the lower angle (θ1) of the light transmitting layer (330) may be an acute angle. For example, the lower angle (θ1) of the light transmitting layer (330) may be 60 degrees or more and less than 90 degrees. In addition, the upper angle (θ2) of the light transmitting layer (330) may be an obtuse angle. For example, the upper angle (θ2) of the light transmitting layer (330) may be more than 90 degrees and less than 120 degrees.

[0183] In a right triangle formed by the hypotenuse (c) corresponding to the side surface of the light transmitting layer (330), the bottom surface (a) extending from the upper surface of the light transmitting layer (330) or the lower surface of the reflective portion (140), and the height (b) of the light transmitting layer (330), the length of the bottom side (a) may be smaller than the height (b). At this time, the ratio of the length of the height (b) and the bottom side (a) may be 1.73 or more. In addition, the length of the bottom side (a) may be smaller than the length of the hypotenuse (c). In addition, the ratio of the length of the hypotenuse (c) and the length of the bottom side (a) may be 0.5 or less.

[0184] In addition, one side of the light-emitting element (120) may have a slope. The side slope angle of one side of the light-emitting element (120) and the lower angle (θ1) of one side of the light-transmitting layer (330) opposite to one side of the light-emitting element (120) may have different angles. Here, the side slope angle of the light-emitting element (120) may be an internal angle of the light-emitting element (120) formed by one side of the light-emitting element (120) and the upper surface of the substrate (110) or the lower surface of the light-emitting element (120). By adjusting the angle of the side slope angle of one side of the light-emitting element (120) and the lower angle (θ1) of one side of the light-transmitting layer (330), the light-direction angle of the light-emitting device (300) may be adjusted. For example, the side slope angle of the light-emitting element (120) may be smaller than the lower angle (θ1) of the light-transmitting layer (330). In this case, light emitted from the side surface of the light-emitting element (120) can be efficiently emitted to the side surface of the light-emitting device (300). As another example, the side surface inclination angle of the light-emitting element (120) may be greater than the lower angle (θ1) of the light-transmitting layer (330). In this case, light emitted from the side surface of the light-emitting element (120) can be efficiently emitted to the lower surface of the light-emitting device (300), thereby widening the light-direction angle of the light-emitting device (300). The cross-sectional view along the A1-A2 direction of FIG. 7 is one illustrated in one of FIGS. 1, 3, 5, 6, 9, 10, 11, 13-18, 20, or 22. For example, the cross-sectional view along A1-A2 of FIG. 6 is illustrated in FIG. 7.

[0185] In addition, the light transmitting layer (330) may be thicker than the light emitting element (120), the reflective portion (140), or the substrate (110). At least a portion of the light emitted from the light emitting element (120) and directed upward may be reflected by the reflective portion (140) and directed to the side. At this time, the side surface of the light transmitting layer (330) may be formed to have an incline, thereby reducing total reflection of light at the side surface of the light transmitting layer (330). Therefore, the light emitting device (300) of the present embodiment may improve the light extraction efficiency at the side surface of the light emitting device (300) by forming the side surface of the light transmitting layer (330) to have an incline.

[0186] Figures 6 to 8 are drawings for explaining a light-emitting device according to a fourth embodiment of the present invention. Figure 6 is a vertical cross-sectional view of a light-emitting device (400) according to a fourth embodiment of the present invention, and Figure 7 is a horizontal cross-sectional view of a light-emitting device (400) according to a fourth embodiment of the present invention.

[0187] A light-emitting device (400) according to a fourth embodiment of the present invention includes a substrate (110), a light-emitting element (120), a light-transmitting layer (330), a first reflective portion (440), and a second reflective portion (450). Here, the substrate (110), the light-emitting element (120), the light-transmitting layer (230), and the first reflective portion (440) of the light-emitting device (400) of the fourth embodiment are the same as the substrate (110), the light-emitting element (120), the light-transmitting layer (330), and the reflective portion (140) of the light-emitting device (300 of FIG. 5) of the third embodiment, respectively.

[0188] Referring to FIGS. 6 and 7, the second reflective portion (450) of the present embodiment is formed on the substrate (110) and is formed to surround the light-emitting element (120). That is, the light-emitting element (120) is placed in the inner space of the second reflective portion (450) and is spaced apart from the inner surface of the second reflective portion (450).

[0189] At this time, the angle formed by the upper surface of the second reflector (450) and the optical axis of the center of the light-emitting element (120) may be smaller than the angle at which the light intensity of the light distribution curve of the light-emitting element (120) is 50% or less or the beam angle when the illuminance is 50%. In addition, the second reflector (450) may also be spaced apart from the first reflector (440). The second reflector (450) may adjust the light path so that the light emitted from the light-emitting element (120) and the light reflected from the first reflector (440) are emitted to the outside of the light-emitting device (400) through the side of the light-transmitting layer (330).

[0190] In addition, in FIG. 7, the second reflector (450) may be formed in a rectangular shape with curved corners based on the cross-section. Since the angle of the corners of the second reflector (450) changes gradually, the phenomenon of light being trapped and lost in the corner area can be reduced, thereby improving the light extraction efficiency of the light emitting device (400). In the present embodiment, the second reflector (450) is not limited to a rectangular shape with curved corners based on the cross-section, and the second reflector (450) may be formed to have various cross-section shapes.

[0191] In addition, referring to FIG. 6, the second reflector (450) may be formed to have a height greater than that of the light-emitting element (120). Therefore, the second reflector (450) may reflect light from the outside of the second reflector (450) toward the light-emitting element (120), thereby reducing light re-incident to the light-emitting element (120). However, the structure of the second reflector (450) is not limited thereto, and the second reflector (450) may be formed to have a height equal to or lower than that of the light-emitting element (120).

[0192] The second reflective portion (450) may be formed of a material that reflects at least a portion of the light traveling within the light-transmitting layer (330). For example, the second reflective portion (450) may have a light reflectivity of 70% or more.

[0193] The second reflector (450) may be formed of a metal. Furthermore, the second reflector (450) may be formed of a metal having a reflectivity of 70% or more for light of a specific wavelength, such as Al, Cu, Fe, Ag, or Au.

[0194] Alternatively, the second reflector (450) may include a base and a light reflecting material dispersed in the base. For example, the base may be formed of epoxy resin, silicone resin, glass, or ceramic. In addition, the light reflecting material dispersed in the base may be TiO2, Ba2Ti9O 20 , BaSO4, SiO2, CaCO3, ZnO, CaCO3 may be at least one of them.

[0195] Alternatively, the second reflector (450) may be a distributed bragg reflector (DBR) formed by stacking multiple layers, at least one of which has a different refractive index. Alternatively, the second reflector (450) may be an omnidirectional reflector. Alternatively, the second reflector (450) may be formed to include multiple types of the second reflectors described above.

[0196] Referring to FIG. 6, the second reflector (450) may have an inner surface formed as a plane perpendicular to the lower surface, and an outer surface formed as an inclined surface forming an acute angle with the lower surface. Alternatively, the inner surface of the second reflector (450) may also be formed as an inclined surface. The angle (θ3) formed by the lower surface and the outer surface of the second reflector (450) and the angle (θ4) formed by the inner surface and the lower surface may be different from each other. Through this, the second reflector (450) may transmit light incident on the inner surface and reflect light incident on the outer surface. For example, the angle (θ3) formed by the lower surface and the outer surface of the second reflector (450) may be smaller than the angle (θ4) formed by the inner surface and the lower surface.

[0197] As illustrated in FIG. 6, the angle (θ3) formed by the lower surface and the outer surface of the second reflective portion (450) may be smaller than the lower angle (θ1) of the light-transmitting layer (330). Here, the lower angle (θ1) of the light-transmitting layer (330) may be the internal angle formed by the side surface of the light-transmitting layer (330) and the upper surface of the substrate (110) or the lower surface of the light-transmitting layer (330), as illustrated in FIG. 5. At least a portion of the light that is reflected or refracted at the interface of the first reflective portion (440) or the light-transmitting layer (330) and directed downward may be reflected from the inclined outer surface of the second reflective portion (450) to the side surface of the light-transmitting layer (330) and emitted to the outside of the light-emitting device (400).

[0198] In addition, the second reflective portion (450) can reflect some of the light and transmit the other part. The light transmittance of the second reflective portion (450) can be controlled by adjusting the ratio of the light reflective material dispersed in the second reflective portion (450). In order to maintain a transmittance above a certain level, the amount of the light reflective material of the second reflective portion (450) can be less than the amount of the base. That is, the ratio of the atomic percentage of the main component material of the light reflective material to the main component material of the base can be less than 1. The ratio of the main component materials can be obtained by analyzing the second reflective portion (450) with an atomic percentage (Atomic percent) using a SEM-EDX (Scanning Electron Microscope-Energy Dispersive X-ray Spectrometer). At this time, the atomic percentage of the main component material of the base and the atomic percentage of the main component material of the light reflective material can be 10% to 35%. For example, when the base material is silicon and the light reflecting material is TiO2, the atomic percentage of Si, which is the main component material of the base material of the second reflecting portion (450), may be 25%, and the atomic percentage of Ti, which is the main component material of the light reflecting material, may be 5%.

[0199] The thickness of the upper region of the second reflective portion (450) may be thinner than the thickness of the lower region of the second reflective portion (450). In this case, the transmittance of the upper region of the second reflective portion (450) may be higher than that of the lower region. The light emitting device (400) may increase the light intensity emitted to the side of the upper region located high through the second reflective portion (450), whose light transmittance increases as it moves away from the lower surface of the second reflective portion (450) in the vertical direction.

[0200] According to an embodiment of the present invention, the second reflector (450) may have a higher light transmittance than the first reflector (440), and through this, the light emitting device (400) may relatively increase the light intensity emitted laterally compared to the light intensity emitted upwardly. However, the light emitting device of the present invention is not limited thereto, and the first reflector (440) and the second reflector (450) may have the same light transmittance or may be different from each other. The light emitting device (400) may increase light uniformity by adjusting the light transmittance of the first reflector (440) and the second reflector (450).

[0201] The second reflective portion (450) of the light-emitting device (400) of the present embodiment can reflect light that is reflected or refracted at the interface of the first reflective portion (440) or the light-transmitting layer (330) and directed downward toward the side surface of the light-transmitting layer (330). Therefore, the light-emitting device (400) of the present embodiment can prevent light from being lost by being trapped inside the light-transmitting layer (330) by the second reflective portion (450) or from being lost by being absorbed by the substrate (110) or the light-emitting element (120).

[0202] The above-described features of the first reflector (440) and the second reflector (450) can be equally applied to other embodiments.

[0203] FIG. 8 is a graph of a light distribution curve of a light-emitting device (400 of FIGS. 6 and 7) according to a fourth embodiment of the present invention.

[0204] Referring to the light distribution curve of Fig. 8, the light distribution curve exists between -90 degrees and 90 degrees.

[0205] Compared with the light distribution curve of the light emitting device of the first embodiment of FIG. 2 (100 of FIG. 1), the light emitting device of the fourth embodiment (400 of FIGS. 6 and 7) has a light intensity emitted along the vertical center line similar to that of the light emitting device of the first embodiment (100 of FIG. 1), but the light emitted in the downward direction is reduced.

[0206] That is, the light-emitting device (400 of FIGS. 6 and 7) according to the fourth embodiment can prevent light from being emitted in a downward direction of the light-emitting device (400) by at least one of the structure of the light-transmitting layer (330) and the second reflector (350), and further can emit light traveling in a downward direction in a lateral direction through the main emission surface. In other words, the light-emitting device (400 of FIGS. 6 and 7) according to the fourth embodiment can increase the light intensity emitted in the lateral direction.

[0207] For example, the second reflector (450) can help change the path of light emitted from the light emitting element (120) at an angle of 85 degrees or more and -85 degrees or less so that the main emission angle of the light emitting device (400) becomes -85 degrees or more and 85 degrees or less. Furthermore, the second reflector (450) can help change the path of light emitted from the light emitting element (120) at an angle of 60 degrees or more and -60 degrees or less so that the main emission angle of the light emitting device (400) becomes -60 degrees or more and 60 degrees or less. That is, the second reflector (450) reflects light emitted from the light emitting element (120) in a direction of -60 degrees or less and 60 degrees or more in a direction of -60 degrees to 60 degrees, so that the light emitting device (400) of the present embodiment can have a higher luminous intensity at -60 degrees to 60 degrees than that at -60 degrees or less and 60 degrees or more.

[0208] Figure 9 is a schematic diagram for explaining a light-emitting device according to a fifth embodiment of the present invention.

[0209] A light-emitting device (500) according to a fifth embodiment includes a substrate (110), a light-emitting element (120), a light-transmitting layer (130), a first reflective portion (440), and a second reflective portion (550). The light-emitting device (500) according to the fifth embodiment has the same substrate (110), light-emitting element (120), light-transmitting layer (130), and first reflective portion (440) as the light-emitting device (400 of FIG. 6) of the fourth embodiment. However, the structure of the second reflective portion (550) of this embodiment is different from the second reflective portion (450) of the fourth embodiment.

[0210] Referring to FIG. 9, the second reflector (550) of the light-emitting device (500) of the fifth embodiment may have an inner surface formed as an inclined surface forming an acute angle with the lower surface, and an outer surface formed as a plane perpendicular to the lower surface. Alternatively, the outer surface of the second reflector (550) may also be formed as an inclined surface. Here, the inner surface angle (θ4), which is the angle formed by the inner surface and the lower surface of the second reflector (550), may be smaller than the outer surface angle (θ3), which is the angle formed by the outer surface and the lower surface. At this time, the inner surface angle (θ4) of the second reflector (550) may be 45 degrees or more and less than 90 degrees. In addition, the difference between the inner surface angle (θ4) and the outer surface angle (θ3) may be 5 degrees or more.

[0211] The angle (θ3) formed by the lower surface and the outer surface of the second reflective portion (450) may be greater than the lower angle (θ1) of the light-transmitting layer (330). In this case, the second reflective portion (450) may emit light that has passed through the inside from the outer surface to the side of the light-transmitting layer (330).

[0212] As illustrated in FIG. 9, at least a portion of the light that is reflected or refracted at the interface of the first reflective portion (440) or the light-transmitting layer (330) and directed downward may be reflected from the inclined inner surface of the second reflective portion (550) toward the side surface of the light-transmitting layer (330) and emitted to the outside of the light-emitting device (500). In addition, a portion of the light emitted from the side surface of the light-emitting element (120) may also be reflected by the second reflective portion (550) toward the upper direction or the side surface of the light-transmitting layer (330). In addition, the light totally reflected at the light-transmitting layer (330) may be re-reflected at the outer surface of the second reflective portion (450) and pass through the side surface of the light-transmitting layer (330), thereby increasing the side light of the light-emitting device (500).

[0213] Fig. 10 is a schematic diagram for explaining a light-emitting device according to a sixth embodiment of the present invention.

[0214] A light-emitting device (600) according to a sixth embodiment includes a substrate (110), a light-emitting element (120), a light-transmitting layer (130), a first reflective portion (440), and a second reflective portion (650). The light-emitting device (600) according to the sixth embodiment has the same substrate (110), light-emitting element (120), light-transmitting layer (130), and first reflective portion (440) as the light-emitting device (400 of FIG. 6) of the fourth embodiment. However, the structure of the second reflective portion (650) of this embodiment is different from the second reflective portion (450) of the fourth embodiment.

[0215] Referring to Fig. 10, the second reflector (650) of the light-emitting device (600) of the sixth embodiment has both an inner surface and an outer surface formed as inclined surfaces, and the inner surface angle (θ4) and the outer surface angle (θ3) are acute angles. At this time, the inner surface angle (θ4) and the outer surface angle (θ3) may be 45 degrees or more and less than 90 degrees. In addition, the inner surface angle (θ4) and the outer surface angle (θ3) may be the same as or different from each other.

[0216] The second reflective portion (650) having such a structure can reflect light toward the side of the light-transmitting layer (130) from both the inner and outer surfaces. That is, the light-emitting device (600) of the sixth embodiment can have all the effects of the second reflective portions (450, 550) of the light-emitting devices of the third and fourth embodiments (400 of FIG. 6 and 500 of FIG. 9).

[0217] FIG. 11 and FIG. 12 are drawings for explaining a light-emitting device according to the seventh embodiment of the present invention. In addition, FIG. 13 is a drawing for explaining a light-emitting device according to the eighth embodiment of the present invention.

[0218] FIG. 11 is a schematic diagram for explaining a light-emitting device (700) according to the seventh embodiment of the present invention, and FIG. 13 is a schematic diagram for explaining a light-emitting device (800) according to the eighth embodiment of the present invention.

[0219] The light-emitting devices (700, 800) according to the seventh and eighth embodiments include a substrate (110), a light-emitting element (120), a light-transmitting layer (130), a first reflective portion (440), and a second reflective portion (750, 850). The light-emitting devices (700, 800) according to the seventh and eighth embodiments have the same substrate (110), light-emitting element (120), light-transmitting layer (230), and first reflective portion (440) as the light-emitting device of the fourth embodiment (400 in FIG. 6). However, the structure of the second reflective portion (750, 850) of the seventh and eighth embodiments is different from the second reflective portion (450) of the fourth embodiment.

[0220] Referring to FIGS. 11 and 13, the second reflective portions (750, 850) of the light-emitting devices (700, 800) according to the seventh and eighth embodiments have different structures, but both include a flat upper surface. When the second reflective portions (750, 850) include a flat upper surface, the contact area with the light-transmitting layer (330) can be increased compared to the second reflective portions without an upper surface as in the previous embodiments. Therefore, the second reflective portions (750, 850) including a flat upper surface can improve the bonding strength with the light-transmitting layer (330), thereby reducing the phenomenon of the light-transmitting layer (330) being peeled off.

[0221] As illustrated in FIGS. 11 and 13, one area of ​​the second reflector (750, 850) may have an area parallel to one area of ​​the first reflector (440). At this time, light reflected from the first reflector (440) and directed downward may be reflected from the upper surface of the second reflector (750, 850) and emitted to the outside of the light-emitting device (700, 800) through the side surface of the light-transmitting layer (330).

[0222] In addition, in the present embodiments, the second reflective portion (750, 850) may be formed as an inclined surface whose inner surface forms an acute angle with the lower surface. Accordingly, the second reflective portion (750, 850) of the light-emitting devices (700, 800) of the present embodiment may have the same effect as the second reflective portion (550) of the light-emitting device (500 of FIG. 9) of the fifth embodiment. For example, the inner surface angle (θ4) may be 45 degrees or more and less than 90 degrees.

[0223] Additionally, the second reflector (750, 850) of the seventh and eighth embodiments may include a flat upper surface.

[0224] In addition, the second reflective portion (750, 850) of the present embodiments may be formed so that the outer surface is in close contact with the inner surface of the light-transmitting layer (330). That is, the second reflective portion (750, 850) may be formed so that one end of the upper surface or the outer edge of the upper surface is in close contact with the inner surface of the light-transmitting layer (330).

[0225] In addition, when the upper surface of the second reflector (750, 850) is an inclined surface, the angle (θ3) of the outer surface of the second reflector (750, 850) may be similar to the angle (θ5) formed between the upper surface of the second reflector (750, 850) and the side surface of the light-transmitting layer (330) by a difference of less than 15 degrees. The angle (θ3) of the outer surface of the second reflector (750, 850) may be the inner angle formed between the upper surface of the second reflector (750, 850) and the substrate (110).

[0226] The flat upper surface of the second reflector (750, 850) can reflect light that is reflected or refracted at the interface of the first reflector (440) or the light-transmitting layer (330) and propagates downward so that it is emitted to the outside of the light-transmitting layer (330) at a region higher than the substrate (110) or the second reflector (750, 850). In addition, the second reflector (750, 850) reflects the light that is directed downward toward the side of the light-transmitting layer (330) at a location higher than the substrate (110), thereby reducing the light travel path and thus reducing light loss.

[0227] Therefore, the light emitting devices (700, 800) of the seventh and eighth embodiments can prevent or minimize light that is reflected or refracted at the interface of the first reflective portion (440) or the light-transmitting layer (330) and propagates downward from being emitted to the outside of the light emitting devices (700, 700) at a lower height than the second reflective portion (750, 850). That is, the light emitting devices (700, 800) of the present embodiment can prevent or minimize light from being emitted downward of the light emitting devices (700, 800) by the second reflective portion (750, 850), thereby reducing the main emission angle and allowing the light distribution curve to have a narrow angle. Here, the angle of the light distribution curve is the angular difference between the maximum angle and the minimum angle when the relative luminous intensity is 0.5.

[0228] Fig. 12 is a graph of a light distribution curve of a light-emitting device (700 in Fig. 11) according to the seventh embodiment of the present invention.

[0229] Referring to Fig. 12, it can be confirmed that the light-emitting device of the seventh embodiment (700 of Fig. 11) does not emit light in a downward direction, but mainly emits light in a lateral direction. For example, the light-emitting device (700 of Fig. 11) may have a relative illuminance of 0.5 or less in an area below -90 degrees or above 90 degrees based on the light distribution curve.

[0230] Referring to Fig. 13, the second reflector (850) of the light-emitting device (800) of the eighth embodiment has a structure in which upper surfaces have different heights. That is, the second reflector (850) of the eighth embodiment has an upper surface formed in a multi-stage structure. For example, the second reflector (850) may be divided into a first portion (851) and a second portion (852) having different heights of the upper surfaces. The first portion (851) may be positioned above the second portion (852) and may have a thinner thickness than the second portion (852). Accordingly, the height of the upper surface of the first portion (851) may be positioned higher than the height of the upper surface of the second portion (852). In addition, the second portion (852) may have a part of the upper surface covered by the first portion (851), and the other part of the upper surface exposed to be in contact with the light-transmitting layer (330).

[0231] According to the present embodiment, the first part (851) may be positioned close to the inner surface of the second reflective part (850). That is, one end of the upper surface of the second part (852) exposed to the outside may be in contact with the outer surface of the second reflective part (850).

[0232] The outer surface of the first part (851) of the second reflector (850) can reflect light directed from the outer side or the outer upper side of the first part (851) toward the outer surface of the first part (851) toward the side surface of the light-transmitting layer (330).

[0233] In addition, the outer surface of the first part (851) of the second reflective part (850) may be an inclined surface, and the angle (θ6) formed by the outer surface of the first part (851) and the upper surface of the second part (852) that are connected to each other may be an obtuse angle. At this time, the angle (θ4) of the inner surface of the second reflective part (850) may be an acute angle, and may differ by 5 degrees or more from the angle (θ6) formed by the outer surface of the first part (851) and the upper surface of the second part (852), and further may differ by 10 degrees or more and 70 degrees or less. The light emitting device (800) may emit light to the side by the inner surface of the second reflective part (850) having such an angle.

[0234] By means of the multi-stage structure of the second reflector (850) as described above, the light emitting device (800) of the present embodiment can implement a wider light distribution curve than the light emitting device of the seventh embodiment (700 of FIG. 11).

[0235] Additionally, the second reflector (850) may have a thickness such that the first part (851), which is the upper region, is thinner than the second part (852), which is the lower region. Here, the thickness of the first part (851) is the distance from the inner side to the outer side of the first part (851), and the thickness of the second part (852) is the distance from the inner side to the outer side of the second part (852).

[0236] A portion of light may be transmitted through the first portion (851) having a relatively thin thickness. In addition, a second portion (852) having a relatively thick thickness may have a higher light reflectivity than the first portion (851). The light-emitting device (800) has a higher luminous intensity at the side than at the bottom due to the second reflective portion (850) that transmits a portion of light in the upper region and reflects light in the lower region. Therefore, the light-emitting device (800) can narrow the beam angle through the second reflective portion (850).

[0237] Referring to Fig. 13, the second reflective portion (850) of the present embodiment may have a thin first portion (851) surrounded by a light-transmitting layer (330). Accordingly, the thin first portion (851) may be protected from external impact by the light-transmitting layer (330).

[0238] The second reflector (850) illustrated in FIG. 13 has a structure in which the inner surface of the first part (851) and the inner surface of the second part (852) are in contact, but the opposite may also be true. For example, the second reflector (850) may be formed in a structure in which the first part (851) having a thinner thickness than the second part (852) is disposed on the upper surface of the second part (852) and the outer surface of the first part (851) and the outer surface of the second part (852) are in contact. In this case, the second reflector (850) can narrow the emission area of ​​light emitted from the side of the light-emitting device (800), thereby obtaining a narrower light distribution curve than in the opposite case.

[0239] Fig. 14 is a schematic diagram for explaining a light-emitting device according to the ninth embodiment of the present invention.

[0240] A light-emitting device (900) according to the ninth embodiment includes a substrate (110), a light-emitting element (120), a first light-transmitting layer (930), a second light-transmitting layer (960), a first reflective portion (440), and a second reflective portion (650). The light-emitting device (900) according to the ninth embodiment has the same substrate (110), light-emitting element (120), first reflective portion (440), and second reflective portion (650) as the light-emitting device of the sixth embodiment (600 of FIG. 10).

[0241] The first light-transmitting layer (930) of the light-emitting device (900) of the ninth embodiment has a different side structure from the light-transmitting layer (330) of the light-emitting device (600 of FIG. 10) of the sixth embodiment. Referring to FIG. 14, the first light-transmitting layer (930) of the present embodiment has a number of protrusions and depressions formed on the side surfaces. The side surface of the first light-transmitting layer (930) with the protrusion and depression structure is the main emission surface from which most of the light of the light-emitting device (900) of the present embodiment is emitted. The protrusion and depression structure of the first light-transmitting layer (930) can diversify the incident angle of light at the side surface of the first light-transmitting layer (930), thereby reducing total reflection of light at the side surface of the first light-transmitting layer (930). Therefore, the light-emitting device (900) of the present embodiment can increase the amount of light emitted in the side direction by the first light-transmitting layer (930) including the protrusions and depressions.

[0242] Additionally, the light-emitting device (900) of the ninth embodiment may include a second light-transmitting layer (960) that covers the light-emitting element (120) and fills the inner space of the second reflective portion (650).

[0243] In the present embodiment, the second light-transmitting layer (960) may include a light-transmitting material (961) and a filler (962) dispersed in the light-transmitting material (961). For example, the light-transmitting material (961) of the second light-transmitting layer (960) may be an epoxy resin, a silicone resin, glass, or ceramic. The filler (962) of the second light-transmitting layer (960) may be a wavelength-converting material, such as a fluorescent substance, a quantum dot (QD), or the like. In addition, the filler (962) of the second light-transmitting layer (960) may be a light-diffusing agent. In addition, the filler (962) of the second light-transmitting layer (960) may include at least one of a wavelength-converting material and a light-diffusing agent. For example, the wavelength-converting material may be a quantum dot or a fluorescent substance that can emit light having a peak wavelength in a green or yellow light wavelength band. At this time, the fluorescent material may include at least one of the LuAG series, the YAG series, the beta-SiAlON series, the nitride series, the silicate series, the halophosphate series, and the oxynitride series. In addition, the wavelength conversion material may be a quantum dot or fluorescent material capable of emitting light having a peak wavelength in the red light wavelength band. At this time, the fluorescent material may include at least one of the nitride series, the silicate series, the sulfide series, and the fluoride series, such as CASN, CASON, and SCASN. The wavelength conversion material included in the second light-transmitting layer (960) is not limited to the types described above, and may be various types of materials already known that can convert the wavelength of light.

[0244] Referring to FIG. 14, the second light-transmitting layer (960) may have an uneven surface structure at the interface due to a filler (962) dispersed in a light-transmitting material (961). The uneven surface structure of the second light-transmitting layer (960) may reflect light that is reflected from the interface of the first reflector (440) or the first light-transmitting layer (930) and directed downwards back toward the side of the first light-transmitting layer (930). In addition, the uneven surface structure of the second light-transmitting layer (960), like the uneven surface structure of the first light-transmitting layer (930), may reduce the total reflection of light that reaches the upper surface (interface) from the inside of the second light-transmitting layer (960), thereby increasing the amount of light incident on the first light-transmitting layer (930). In addition, the uneven structure of the second light-transmitting layer (960) can reduce the number of times light is reflected inside the first light-transmitting layer (930) and inside the second light-transmitting layer (960), thereby preventing loss due to repeated reflection of light.

[0245] In this way, the light emitting device (900) of the present embodiment can improve light efficiency by increasing the amount of light emitted to the outside through the side surface by the first light transmitting layer (930) and the second light transmitting layer (960).

[0246] Fig. 15 is a schematic diagram for explaining a light-emitting device according to the tenth embodiment of the present invention. Fig. 16 is a schematic diagram for explaining a light-emitting device according to the eleventh embodiment of the present invention.

[0247] The light-emitting devices (1000, 1100) according to the 10th and 11th embodiments include a substrate (110), a light-emitting element (120), a light-transmitting layer (1030, 1130), and a reflective portion (1040, 1140). The light-emitting devices (1000, 1100) according to the 10th and 11th embodiments have the same substrate (110) and light-emitting element (120) as the light-emitting device of the third embodiment (300 of FIG. 5). However, the light-transmitting layer (1030, 1130) and the reflecting portion (1040, 1140) of the light-emitting devices (1000, 1100) of the 10th and 11th embodiments are structurally different from the light-transmitting layer (330) and the reflecting portion (150) of the light-emitting device (300 of FIG. 5) of the third embodiment.

[0248] Referring to FIG. 15, the light-transmitting layer (1030) of the light-emitting device (1000) of the 10th embodiment may be formed as a curved surface whose upper surface is concave downward. In addition, referring to FIG. 16, the light-transmitting layer (1130) of the light-emitting device (1100) of the 11th embodiment may include an inclined surface so that a portion of the upper surface has a concave shape downward. That is, the light-emitting devices (1000, 1100) of the 10th and 11th embodiments are formed such that at least a portion of the upper surface of the light-transmitting layer (1030, 1130) is concave downward. Accordingly, the light-transmitting layer (1030, 1130) may have a structure in which the height of at least a portion of the upper surface gradually decreases toward the center.

[0249] Since the light-emitting device (1000) of the 10th embodiment of FIG. 15 has a concave curved upper surface of the light-transmitting layer (1030), the angle (θ7) formed by the tangent line of the upper surface of the light-transmitting layer (1030) and the upper surface of the substrate (110) or the extension line of the upper surface of the substrate (110) decreases from the outer side to the center of the light-transmitting layer (1030). Accordingly, the tangent angle at the center of the light-transmitting layer (1030) becomes 0 degrees. In addition, the tangent line at the center of the light-transmitting layer (1030) may be parallel to the upper surface of the substrate (110) or the light-emitting element (120). In this case, the reflective portion (1040, 1140) may not reflect a portion of the light incident in a direction perpendicular to the tangent line at the center of the light-transmitting layer (1030) and may transmit the light. At this time, the light emitting device (1000, 1100) may have a relative luminance greater than 0 in an area near 0 degrees including 0 degrees based on the light distribution curve.

[0250] In addition, since the light-emitting device (1100) of the 11th embodiment of FIG. 16 includes an inclined surface so that the upper surface of the light-transmitting layer (1130) is concave, the lower surface of the reflective portion (1140) has an inclined surface that faces downwards as it goes toward the center. Since the inclined surface of the lower surface of the reflective portion (1140) faces downwards as it goes toward the center, it forms an acute angle with respect to the upper surface of the substrate (110).

[0251] The reflective portions (1040, 1140) of the light-emitting devices (1000, 1100) of the 10th and 11th embodiments are formed to cover the upper surface of the light-transmitting layer (1030, 1130). Therefore, the reflective portions (1040, 1140) may include a structure in which at least a portion of the lower surface is convex in a downward direction. Referring to FIG. 15, the reflective portion (1040) of the 10th embodiment may be formed as a curved surface whose lower surface is convex in a downward direction. In addition, referring to FIG. 16, the reflective portion (1140) of the 11th embodiment may include an inclined surface so that the lower surface is convex in a downward direction.

[0252] Since the light-emitting device (1000) of the 10th embodiment of FIG. 15 has a concave curved upper surface of the light-transmitting layer (1030), the angle (θ7) formed between the upper surface of the light-transmitting layer (1030) or the lower surface of the reflective portion (1040) and the substrate (110) decreases from the outer side to the center of the light-transmitting layer (1030) and the reflective portion (1040). Accordingly, the tangential angle at the center of the light-transmitting layer (1030) and the reflective portion (1040) becomes 0 degrees.

[0253] In addition, the reflective portion (1040, 1140) may have a thickness that increases from the outside to the inside at least in part. In addition, the reflective portion (1040, 1140) may have a maximum thickness in a region close to the upper surface of the light-emitting element (120). The reflective portion (1040, 1140) having such a structure may reflect light emitted from the upper surface of the light-emitting element (120) toward the side of the light-transmitting layer (1030, 1130), thereby widening the beam angle of the light-emitting device (1000, 1100).

[0254] The downward convex structure of the reflective portion (1040, 1140) of the 10th and 11th embodiments can prevent light emitted from the light-emitting element (120) from being reflected from the reflective portion (1040, 1140) toward the downward direction where the light-emitting element (120) and the substrate (110) are located. In addition, the light can be reflected from the lower surface of the convex structure of the reflective portion (1040, 1140) and directed toward the side surface of the light-transmitting layer (1030, 1130).

[0255] Accordingly, the light emitting devices (1000, 1100) of the 10th and 11th embodiments can enable light to be emitted to the outside through the side surface of the light-transmitting layer (1030, 1130) with a minimum reflection and travel distance by the reflective portion (1040, 1140) having at least a portion of a downwardly convex structure. In addition, the light emitting devices (1000, 1100) of the 10th and 11th embodiments can minimize the loss of light by minimizing the number of times light is reflected within the light-transmitting layer (1030, 1130) by the reflective portion (1040, 1140).

[0256] Figure 17 is a schematic diagram for explaining a light-emitting device according to the 12th embodiment of the present invention.

[0257] A light-emitting device (1200) according to the 12th embodiment includes a substrate (110), a light-emitting element (120), a light-transmitting layer (1230), and a reflective portion (1140). The light-emitting device (1200) according to the 12th embodiment has the same substrate (110), light-emitting element (120), and reflective portion (1140) as the light-emitting device of the 11th embodiment (1100 of FIG. 16). However, the light-transmitting layer (1230) of the light-emitting device (1200) of the 12th embodiment has a different structure from the light-transmitting layer (1130) of the light-emitting device of the 11th embodiment (1100 of FIG. 16).

[0258] The light-emitting device (1200) of the 12th embodiment has an upper surface of the outer side of the reflective portion (1140) that is inclined, unlike the light-emitting device (1100 of FIG. 16) of the 11th embodiment. That is, the upper surface of the light-emitting layer (1230) of the present embodiment has an inclined region adjacent to the outer side of the reflective portion (1140). Accordingly, the light-emitting device (1200) of the 12th embodiment has a structure in which the entire upper surface is covered by the reflective portion (1140), and the side surfaces of the light-emitting layer (1230) are formed with different inclined surfaces.

[0259] Referring to FIG. 17, the light transmitting layer (1230) of the present embodiment may include a first inclined surface (1231) and a second inclined surface (1232) having different inclinations. The light transmitting layer (1230) is formed with a first inclined surface (1231) whose upper area of ​​the side surface forms an obtuse angle with the upper surface. In addition, the light transmitting layer (1230) is formed with a second inclined surface (1232) whose lower area of ​​the side surface forms an obtuse angle with the lower surface. At this time, the second inclined surface (1232) having an obtuse angle with respect to the lower surface of the light transmitting layer (1230) or the upper surface of the substrate (110) may have the same effect as the effect when the lower angle (θ1) of the light transmitting layer described through the previous embodiment is an obtuse angle. In addition, if the second inclined surface (1232) of the light transmitting layer (1230) forms an acute angle with respect to the lower surface of the light transmitting layer (1230) or the upper surface of the substrate (110), the same effect as the effect when the lower angle (θ1) of the light transmitting layer described in the previous embodiment is an acute angle can be achieved.

[0260] The light transmitting layer (1230) may have an angle (θ8) between the first inclined surface (1231) and the upper surface smaller than an angle (θ9) between the first inclined surface (1231) and the second inclined surface (1232). At this time, the angle (θ9) between the first inclined surface (1231) and the second inclined surface (1232) may be an obtuse angle. In addition, the angle (θ8) between the first inclined surface (1231) and the upper surface and the angle (θ9) between the first inclined surface (1231) and the second inclined surface (1232) may be larger than the angle formed by the inclined surface of the reflective portion (1140) or an extension of the inclined surface with respect to the substrate (110). In addition, the angle (θ9) between the first inclined surface (1231) and the second inclined surface (1232) may be larger than the lower angle (θ1) of the light transmitting layer (1230).

[0261] According to the present embodiment, light reflected from the lower surface of the reflective portion (1140) and directed upward can be refracted toward the horizontal center line of the light emitting device (1200) at the first inclined surface (1231) of the side surface of the light-transmitting layer (1230). Therefore, the light emitting device (1200) of the present embodiment can minimize light traveling upward through the side surface of the light-transmitting layer (1230) and increase light emitted in the side surface by having a structure in which the side surface of the upper portion of the light-transmitting layer (1230) is formed as an inclined surface having an obtuse angle with the upper surface.

[0262] FIG. 18 and FIG. 19 are drawings for explaining a light-emitting device according to the 13th embodiment of the present invention.

[0263] Fig. 18 is a schematic diagram for explaining a light-emitting device (1300) according to the 13th embodiment of the present invention.

[0264] A light-emitting device (1300) according to a 13th embodiment of the present invention includes a substrate (110), a light-emitting element (120), a light-transmitting layer (1230), a first reflective portion (1340), and a second reflective portion (650). Here, the substrate (110), the light-emitting element (120), the light-transmitting layer (1230), and the first reflective portion (1340) of the light-emitting device (1300) of the 13th embodiment are the same as the substrate (110), the light-emitting element (120), the light-transmitting layer (1230), and the reflective portion (1140) of the light-emitting device (1200 of FIG. 17) of the 12th embodiment, respectively. That is, the light-emitting device (1300) according to the 13th embodiment of the present invention is the light-emitting device (1200 of FIG. 17) of the 12th embodiment with the addition of a second reflective portion (650).

[0265] Accordingly, the light emitting device (1300) of the present embodiment can have all of the effects of the reflective portion (1140 of FIG. 16) of the 11th embodiment, the light transmitting layer (1230 of FIG. 17) of the 12th embodiment, and the second reflective portion (650 of FIG. 10) of the 6th embodiment.

[0266] In addition, the angle (θ8) between the first inclined surface (1231) and the upper surface of the light-transmitting layer (1230) or the angle (θ9) between the first inclined surface (1231) and the second inclined surface (1232) may be greater than the angle (θ3) between the lower surface and the outer surface of the second reflective portion (650) and the angle (θ4) between the lower surface and the inner surface of the second reflective portion (650).

[0267] Fig. 19 is a graph of a light distribution curve of a light emitting device according to the 13th embodiment of the present invention.

[0268] Referring to FIG. 19, the light-emitting device (1300 of FIG. 18) according to the 13th embodiment minimizes light emission in the downward direction by the second reflector (650), and intensively emits light in the side direction by the first reflector (1340) and the light-transmitting layer (1230).

[0269] FIG. 20 and FIG. 21 are drawings for explaining a light-emitting device according to the 14th embodiment of the present invention.

[0270] FIG. 20 is a schematic diagram for explaining a light-emitting device (1400) according to the 14th embodiment of the present invention.

[0271] A light-emitting device (1400) according to a fourteenth embodiment of the present invention includes a substrate (110), a light-emitting element (120), a light-transmitting layer (1430), a first reflective portion (1340), a second reflective portion (650), and a third reflective portion (1480). Here, the substrate (110), the light-emitting element (120), the first reflective portion (1340), and the second reflective portion (650) of the light-emitting device (1400) of the fourteenth embodiment are the same as the substrate (110), the light-emitting element (120), the first reflective portion (1340), and the second reflective portion (650) of the light-emitting device (1300 of FIG. 18) of the thirteenth embodiment.

[0272] In the present embodiment, the side surface of the light-transmitting layer (1430) may include a first inclined surface (1431) that slopes outward from the upper surface toward the lower surface, and a second inclined surface (1432) that slopes inward from the first inclined surface (1431) toward the lower surface. The upper end of the first inclined surface (1431) is connected to the upper surface of the light-transmitting layer (1430), and the lower end is connected to the second inclined surface (1432). In addition, the lower end of the second inclined surface (1432) is connected to the lower surface of the light-transmitting layer (1430).

[0273] The third reflective portion (1480) may be formed to cover a portion of the side surface of the light-transmitting layer (1430) from the outside of the light-transmitting layer (1430). That is, the third reflective portion (1480) may be positioned to cover a portion of the outer surface of the light-transmitting layer (1430). Referring to FIG. 20, the third reflective portion (1480) may be positioned to cover the second inclined surface (1432), which is a lower portion of the side surface of the light-transmitting layer (1430). Therefore, light directed toward the second inclined surface (1432) of the light-transmitting layer (1430) may not be emitted to the outside of the light-emitting device (1400) by the fourth reflective portion (1480), and may be reflected into the inside of the light-transmitting layer (1430). Therefore, the main emission surface of the light emitting device (1400) of the present embodiment can be the first inclined surface (1431) of the light transmitting layer (1430).

[0274] The third reflector (1480) may be formed of a material that reflects at least a portion of the light traveling within the light-transmitting layer (1430). For example, the third reflector (1480) may be formed of a metal. Alternatively, the third reflector (1480) may include a light-transmitting material and a light-reflecting material dispersed in the light-transmitting material. For example, the light-transmitting material may be an epoxy resin, a silicone resin, glass, or a ceramic. Additionally, the light-reflecting material may include at least one of TiO2, BaSO4, and silica. Alternatively, the third reflector (1480) may be a distributed bragg reflector (DBR) formed by stacking a plurality of layers, at least one of which has a different refractive index. Alternatively, the third reflector (1480) may be an omni-directional reflector. Alternatively, the third reflector (1480) may be formed to include a plurality of the third reflectors (1480) described above. In addition, the third reflector (1480) may have a changeable light transmittance as needed. That is, the third reflector (1480) may have a light transmittance of 0%, reflecting all light, or may have a light transmittance of more than 0%, reflecting a portion of the light and transmitting the other portion.

[0275] As an example, the third reflector (1480) has an angle (θ) between the lower surface and the outer surface. 10 ) is the angle between the inner and outer surfaces (θ) 11 ) may be greater than. At this time, when the light travels from the inside to the outer surface of the third reflector (1480), the light whose angle with the outer surface of the third reflector (1480) is smaller than the total reflection angle increases, so that the total reflection of the light may decrease on the outer surface of the third reflector (1480). Accordingly, the transmittance of the light increases on the outer surface of the third reflector (1480), so that the light extraction efficiency on the side of the light emitting device (1400) may increase.

[0276] In another embodiment, the third reflector (1480) has an angle (θ) of the outer surface 10 ) is the angle of the inner surface (θ11 ) may be smaller than. At this time, when light passes through the outer surface of the third reflector (1480), the light emitted perpendicular to the outer surface may increase. Accordingly, the light emitting device (1400) may have a light distribution curve having a wide beam angle. That is, the light emitting device (1400) may have a wide light distribution curve.

[0277] In addition, the angle (θ9) of the first inclined surface (1431) and the second inclined surface (1432) of the light transmitting layer (1430) is the angle (θ) of the outer surface of the third reflective portion (1480). 10 ) and inner side angle (θ 11 ) can be greater than that. Such a structure can reduce total reflection at the first inclined surface (1431) by making the incident angle of light at the first inclined surface (1431) smaller than the critical angle. Accordingly, the light emitted through the first inclined surface (1431) can increase.

[0278] Fig. 21 is a graph of a light distribution curve of a light emitting device according to the 14th embodiment of the present invention.

[0279] Referring to Fig. 21, it can be seen that the light-emitting device (1400 of Fig. 20) according to the 14th embodiment mainly emits light at angles greater than -45 degrees and less than 0 degrees and greater than 0 degrees and less than 45 degrees. That is, the light-emitting device (1400 of Fig. 20) of the 14th embodiment mainly emits light in the upper direction of the side.

[0280] This luminescence is because the luminescence device (1400 in FIG. 20) in the third reflector (1480) is suppressed from emitting light in the downward direction and the downward direction of the side, and most of the light is emitted from the upper part of the side where the third reflector (1480) is not present.

[0281] In this way, the light emitting device (1400 in FIG. 20) according to the 14th embodiment can control the light emitting area through the third reflector (1480).

[0282] In FIG. 20, the third reflective portion (1480) is formed to cover the entire second inclined surface (1432) of the light-transmitting layer (1430), but the area where the third reflective portion (1480) is formed may be variously changed. For example, the third reflective portion (1480) may be formed to cover a portion of the second inclined surface (1432) of the light-transmitting layer (1430), or the entirety or a portion of the first inclined surface (1431). Alternatively, the third reflective portion (1480) may be formed to cover a portion of each of the first inclined surface (1431) and the second inclined surface (1432) of the light-transmitting layer (1430). Alternatively, the third reflective portion (1480) may be formed to cover the entirety of either the first inclined surface (1431) or the second inclined surface (1432) of the light-transmitting layer (1430) and a portion of the other.

[0283] In this way, the light-emitting device according to the 14th embodiment (1400 of FIG. 20) can control various light-emitting characteristics of the light-emitting device, such as the light-emitting direction, light-emitting angle, and light-emitting shape, by having the third reflector (1480) cover an area excluding the main emission surface on the side of the light-transmitting layer (1430).

[0284] FIG. 22 is a schematic diagram for explaining a light-emitting device according to the 15th embodiment of the present invention.

[0285] A light-emitting device (1500) according to a fifteenth embodiment of the present invention may include a substrate (110), a light-emitting element (120), a light-transmitting layer (1530), a first reflective portion (1540), and a third reflective portion (1480). In addition, the third reflective portion (1480) of the light-emitting device (1500) of the present embodiment includes the same features as the third reflective portion (1480) of the light-emitting device (1400 of FIG. 20) of the fourteenth embodiment.

[0286] In addition, as the thickness of the third reflector (1480) decreases, the transmittance of the third reflector may increase. Therefore, the transmittance of the third reflector (1480) may increase from the bottom to the top. The light-emitting device (1500) of the present embodiment can obtain a light distribution curve having a higher luminous intensity at -80 degrees to -45 degrees and 80 degrees to 45 degrees than at -90 degrees to -80 degrees and 80 degrees to 90 degrees by adjusting the thickness of the third reflector (1480) in each region.

[0287] In addition, the structure in which the third reflective portion (1480) covers the entire side surface of the light-transmitting layer (1530) can control the light intensity emitted for each area of ​​the side surface of the light-emitting device (1500) by adjusting the thickness of the third reflective portion (1480) for each area. Furthermore, the difference in light intensity according to the direction of the light-emitting device (1500) can be reduced. For example, the difference between the maximum light intensity for each angle between the light distribution curve based on the direction of the other side facing one side of the light-emitting device (1500) and the light distribution curve based on the direction of the other corner facing one edge of the light-emitting device (1500) may be less than 10%.

[0288] In this embodiment, the light-transmitting layer (1530) is formed of a sloped surface whose side surface slopes inward from top to bottom.

[0289] In addition, the upper angle (θ) is the angle formed by the tangent line between the side surface and the upper surface of the light transmitting layer (1530). 12 ) may be an acute angle. The upper angle (θ) of the light transmitting layer (1530) 12 ) is the angle (θ) between the lower surface and the outer surface of the third reflector (1480). 10 ) and the angle (θ) between the lower surface and the inner surface of the third reflector (1480) 11 ) may be smaller than that. In addition, the upper angle (θ) of the light transmitting layer (1530) 12 ) may be greater than the angle (θ7) formed by the tangent line of the upper surface of the light-transmitting layer (1530) and the substrate (110).

[0290] The light-emitting devices described through various embodiments of the present invention may further include a separate wavelength conversion member. The wavelength conversion member may be formed to cover at least a portion of the light-emitting element, and may be formed to cover at least a portion of the light-transmitting layer. The wavelength conversion member may include a wavelength conversion material that absorbs light from the light-emitting element and emits light of a different wavelength from the absorbed light. Here, the wavelength conversion material may include at least one of a phosphor, a quantum dot, an organic dye, and a nonlinear optical converter.

[0291] For example, the wavelength conversion material may be a quantum dot or a phosphor that can emit light having a peak wavelength in the green or yellow light wavelength range. In this case, the phosphor may include at least one of the LuAG series, the YAG series, the beta-SiAlON series, the nitride series, the silicate series, the halophosphate series, and the oxynitride series.

[0292] Additionally, the wavelength conversion material may be a quantum dot or phosphor capable of emitting light having a peak wavelength in the red light wavelength range. In this case, the phosphor may include at least one of a nitride series, a silicate series, a sulfide series, and a fluoride series, such as CASN, CASON, and SCASN.

[0293] However, wavelength conversion materials are not limited to the types described above, and various types of wavelength conversion materials already known according to the color of light emitted can be applied to the present invention.

[0294] FIG. 23 is a schematic drawing of a lighting device according to an embodiment of the present invention.

[0295] Referring to FIG. 23, the lighting device (10) may include a main body (15), an optical sheet (13), and a light-emitting module (14).

[0296] A light-emitting module (14) may be placed inside the main body (15). In addition, various components, such as elements and wiring for the operation of the light-emitting module (14), may be placed inside the main body (15). In addition, although not shown in the drawing, a heat dissipation unit and a socket connected to an external power source may be formed or placed inside the main body (15).

[0297] The light emitting module (14) may include a module substrate (11) and at least one light emitting unit (12).

[0298] At least one light emitting unit (12) can be mounted on the upper part of the module substrate (11).

[0299] For example, a single light emitting unit (12) may be mounted on a module substrate (11). At this time, the light emitting unit (12) may be a light emitting device described through FIGS. 1 to 22, or may be formed by a combination of components forming these light emitting devices.

[0300] In addition, as illustrated in FIG. 23, a plurality of light-emitting units (12) may be arranged in a plurality of rows and columns on the upper portion of the module substrate (11). In addition, the plurality of light-emitting units (12) may include at least one of the light-emitting devices described through FIGS. 1 to 22. In addition, the plurality of light-emitting units (12) may all be composed of the same light-emitting device. At this time, the plurality of light-emitting units (12) may be one of the light-emitting devices described through FIGS. 1 to 22 or may be composed of a combination of components formed by these light-emitting devices.

[0301] Alternatively, the light emitting module (14) may be one of the light emitting devices previously described through various embodiments. That is, the substrate of the light emitting device of FIGS. 1 to 22 corresponds to the module substrate (11) of the light emitting module (14), and the components formed on the upper portion of the substrate of the light emitting device may correspond to the light emitting unit (12) of the light emitting module (14). That is, the light emitting unit (12) includes a light emitting element formed on the substrate, a first light-transmitting layer, and a first reflecting portion, and may include at least one of a second light-transmitting layer, a second reflecting portion, and a third reflecting portion.

[0302] At this time, a single light emitting unit (12) may be mounted on the module substrate (11), or multiple light emitting units (12) may be mounted. When there are multiple light emitting units (12), the structure of all light emitting units (12) may be the same, and at least one light emitting unit (12) may have a different structure from the other light emitting units (12).

[0303] In this way, the light emitting module (14) of the present embodiment can be formed in various ways by applying components of various light emitting devices described previously.

[0304] The optical sheet (13) may include a light-transmitting material and a filler dispersed within the light-transmitting material. Here, the filler of the optical sheet (13) may be a light-diffusing material.

[0305] The optical sheet (13) can uniformly diffuse the light emitted from the light emitting module (14) to ensure that the illuminance is constant in the area within the beam angle of the lighting device (10).

[0306] According to the present embodiment, the optical sheet (13) can be combined with the main body (15) to cover the light-emitting module (14). At this time, the optical sheet (13) can be arranged parallel to one surface of the module substrate (11) on which the light-emitting unit (12) is arranged. At this time, the optical sheet (13) can be arranged parallel to the reflective portion of the light-emitting device (100-1500 of FIGS. 1 to 22). The optical sheet (13) can receive light emitted from the side of the light-emitting device over a large area, thereby increasing light-receiving efficiency.

[0307] The lighting device (10) of the present embodiment can have a wide beam angle by applying the light-emitting devices of the various embodiments described previously. For example, the beam angle of the lighting device (10) can be 90 to 170 degrees.

[0308] The lighting device (10) illustrated in Fig. 23 has a flat shape, but the lighting device (10) can be formed in various shapes.

[0309] FIG. 24 is a schematic diagram illustrating a display device according to an embodiment of the present invention.

[0310] According to the present embodiment, the display device (20) may include a display panel (21), a panel guide (22), and a backlight unit (25). In addition, although not shown in the drawing, the display device (20) of the present embodiment may further include a top cover that covers the upper edge of the display panel (21) and is coupled to the backlight unit (25).

[0311] The display panel (21) may include a thin film transistor substrate, a color filter substrate, and a liquid crystal layer interposed between the thin film transistor substrate and the color filter substrate, which are bonded to each other so that a uniform cell gap is maintained.

[0312] A driving substrate (23) that supplies driving signals to gate lines and data lines may be positioned at the edge of the display panel (21). The driving substrate (23) is electrically connected to the display panel (21) by at least one of a COF (Chip On Film) and a TCP (Tape Carrier Package).

[0313] The backlight unit (25) may include optical sheets (26), a cover (27) and a light emitting module (28).

[0314] The cover (27) has an open upper surface and can store a light emitting module (28) and optical sheets (26) inside it.

[0315] The light-emitting module (28) may include a module substrate (29) and at least one light-emitting unit (24). The light-emitting module (28) of the present embodiment may be the same as the light-emitting module (14) described in FIG. 23. That is, the module substrate (29) and the light-emitting unit (24) of the light-emitting module (28) of the present embodiment may have the same characteristics as the module substrate (11) and the light-emitting unit (12) of the light-emitting module (14) described in FIG. 23, respectively. The light-emitting module (28) of the display device (20) of the present embodiment may be formed of the light-emitting devices described through FIGS. 1 to 22 or may be formed in various ways by combining their components.

[0316] The optical sheets (26) may include at least one of a diffusion sheet, a light-concentrating sheet, and a protective sheet. The optical sheets (26) may include one or more of the diffusion sheet, the light-concentrating sheet, and the protective sheet, and may include one or more of at least one of the diffusion sheet, the light-concentrating sheet, and the protective sheet. For example, the optical sheets (26) may be composed of one diffusion sheet and two light-concentrating sheets, or may be composed of two diffusion sheets and one light-concentrating sheet.

[0317] The optical sheets (26) may be arranged parallel to the light emitting module (14). Furthermore, the optical sheets (26) may be arranged parallel to one surface of the light emitting unit (24) or the module substrate (29) on which the light emitting unit (24) is mounted.

[0318] The display device (20) according to the present embodiment includes a light emitting unit (24) having a wide target angle or beam angle, and an optical sheet (26) is arranged parallel to the light emitting unit (24) or a light emitting module (28) having the light emitting unit (24), so that uniform illuminance can be achieved even over a wide area. Therefore, the display device (20) of the present embodiment can have a wide viewing angle so as to have consistent quality at various angles even when formed over a large area.

[0319] Additionally, the backlight unit (25) may further include a reflective sheet (not shown). The reflective sheet may be formed to cover the upper surface of the module substrate (29) of the light-emitting module (28), or may be placed on the lower portion of the module substrate (29). The reflective sheet may reflect light directed downwards of the optical sheets (26) or downwards of the light-emitting module (28) toward the optical sheets (26).

[0320] The light-emitting device having the features described through the embodiments of the present invention can be applied as a light source of various devices such as a display device, a backlight unit of a display device, a lighting device, etc.

[0321] As described above, the detailed description of the present invention has been made by way of embodiments with reference to the attached drawings. However, the above-described embodiments have only been described as preferred examples of the present invention, and therefore, the present invention should not be understood as being limited to the above-described embodiments, and the scope of the rights of the present invention should be understood by the claims described below and their equivalent concepts.

Claims

1. Substrate; A light-emitting element disposed on the substrate and emitting light; A first light-transmitting layer formed to cover the light-emitting element and arranged on the substrate, the first light-transmitting layer made of a material that transmits light emitted from the light-emitting element; and A first reflector disposed in at least a portion of the first light-transmitting layer and reflecting at least a portion of the light; A light emitting device in which the side surface of the first light transmitting layer includes an inclined surface.

2. In claim 1, A light emitting device in which the side surface of the first light transmitting layer forms an obtuse angle with the lower surface of the first light transmitting layer.

3. In claim 1, A light emitting device in which the side surface of the first light transmitting layer forms an acute angle with the lower surface of the first light transmitting layer.

4. In claim 1, A light emitting device having unevenness formed on the side surface of the first light transmitting layer.

5. In claim 1, A light emitting device in which the first reflector is formed so that its lower surface is in close contact with the upper surface of the first light transmitting layer.

6. In claim 5, A light-emitting device in which the first light-transmitting layer has a flat upper surface.

7. In claim 5, The above first light-transmitting layer has a structure in which at least a portion of the upper surface is concave in a downward direction, A light emitting device in which the first reflector has a flat upper surface.

8. In claim 7, A light emitting device in which the lower surface of the first reflector is curved.

9. In claim 7, A light emitting device in which at least a portion of the lower surface of the first reflector is an inclined surface.

10. In claim 1, A light emitting device in which the side surfaces of the first light transmitting layer are formed with different slopes.

11. In claim 10, A light emitting device in which the upper portion of the side surface of the first light transmitting layer includes a first inclined surface forming an obtuse angle with the upper surface of the first light transmitting layer, and the lower portion of the side surface includes a second inclined surface forming an obtuse angle with the lower surface of the first light transmitting layer.

12. Substrate; A light-emitting element disposed on the substrate and emitting light; A first light-transmitting layer formed to cover the light-emitting element and arranged on the substrate, the first light-transmitting layer made of a material that transmits light emitted from the light-emitting element; A first reflector disposed on at least a portion of the upper surface of the first light-transmitting layer and configured to reflect at least a portion of the light; and A second reflective portion is disposed on the substrate within the first light-transmitting layer and formed to surround at least a portion of a side surface of the light-emitting element; The side of the first light-transmitting layer is the main emission surface through which the light of the light-emitting element is emitted to the outside, The side surface of the first light-transmitting layer includes an inclined surface, A light-emitting device in which the inner surface of the second reflector and the side surface of the light-emitting element are spaced apart.

13. In claim 12, The above second reflector is a light-emitting device that reflects some of the light and transmits the other part.

14. In claim 12, A light emitting device in which at least one of the inner and outer surfaces of the second reflector is an inclined surface forming an acute angle with the lower surface of the second reflector.

15. In claim 12, A light emitting device wherein the second reflector includes a flat upper surface.

16. In claim 12, A light-emitting device further comprising a second light-transmitting layer formed in the inner space of the second reflector to cover the light-emitting element and transmitting the light.

17. In claim 16, A light-emitting device wherein the second light-transmitting layer further includes a filler.

18. In claim 17, A light emitting device in which the upper surface of the second light-transmitting layer has a rough structure due to the filler.

19. In claim 17, A light emitting device wherein the filler comprises at least one of a wavelength conversion material and a light diffusing agent.

20. Substrate; A light-emitting element disposed on the substrate and emitting light; A first light-transmitting layer formed to cover the light-emitting element and arranged on the substrate, the first light-transmitting layer made of a material that transmits light emitted from the light-emitting element; A first reflector arranged on at least a portion of the upper surface of the first light-transmitting layer and configured to reflect at least a portion of the light; and An optical sheet arranged parallel to the light emitting element; The side of the first light-transmitting layer is the main emission surface through which the light of the light-emitting element is emitted to the outside, A display device in which the side surface of the first light-transmitting layer includes an inclined surface.

Images