Light-emitting device

Abstract

According to one aspect of the present invention, a light-emitting device can be provided, the device comprising: a light-emitting element for generating light; a reflector disposed at a side of the light-emitting element so as to reflect the light toward the light-emitting element; and a substrate for supporting the light-emitting element and the reflector, wherein the reflector has a region in which the color of the reflector, viewed from a cross section, is different from the color of the reflector, viewed from the top.

Description

light-emitting device

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

[0002] Light-emitting diodes (LEDs) have been widely used recently. LEDs utilize the properties of compound semiconductors to convert electrical signals into forms of light such as infrared, visible light, and ultraviolet light.

[0003] As the light efficiency of light-emitting diodes increases, light-emitting devices are being applied in various fields, including display devices, lighting fixtures, and automotive lamps.

[0004] Embodiments of the present invention aim to provide a light-emitting device with improved contrast by minimizing optical interference between light-emitting elements.

[0005] In addition, embodiments of the present invention aim to provide a light-emitting device with improved light extraction efficiency.

[0006] According to one aspect of the present invention, a light-emitting device may be provided, comprising: a light-emitting element that generates light; a reflector disposed on the side of the light-emitting element and reflecting light toward the light-emitting element; and a substrate supporting the light-emitting element and the reflector, wherein the color of the reflector viewed from the side has a region different from the color of the reflector viewed from the top.

[0007] According to one aspect of the present invention, a light-emitting device may be provided, comprising: a light-emitting element that generates light; a reflector disposed on the side of the light-emitting element; and a substrate that supports the light-emitting element and the reflector, wherein the reflector includes a reflection region and an absorption region, and the carbon content of the absorption region is higher than the carbon content of the reflection region.

[0008] In addition, a light-emitting device may be provided in which the color of the reflector viewed from above is black and the color of the reflector viewed from the side is white.

[0009] In addition, a light-emitting device may be provided in which the light intensity deviation of the light generated from the light-emitting element is 0.015 or less, and the light intensity deviation is the difference in light intensity between the light generated from the light-emitting element that is irradiated upward and the light generated from the light-emitting element that is irradiated in a direction offset from the upward direction.

[0010] In addition, a light-emitting device may be provided in which the rate of change in brightness of light generated from the light-emitting element is 50% or less, and the rate of change in brightness is the rate of change in brightness between the light generated from the light-emitting element that is irradiated upward and the light generated from the light-emitting element that is irradiated in a direction offset from the upward.

[0011] Additionally, a light-emitting device may be provided, wherein the reflector comprises: a reflection area disposed on the side of the light-emitting element to reflect light toward the light-emitting element; and an absorption area that covers the reflection area and absorbs light.

[0012] In addition, a light-emitting device may be provided in which the thickness of the reflection region is greater than the thickness of the absorption region.

[0013] In addition, a light-emitting device may be provided in which the reflection region and the light-absorbing region are formed integrally, and the interface between the reflection region and the light-absorbing region is non-uniform.

[0014] Additionally, the light-emitting device may be provided, wherein the light-emitting element comprises: a first conductivity type semiconductor layer; an active layer stacked on the first conductivity type semiconductor layer; and a second conductivity type semiconductor layer stacked on the active layer, and the width of the reflection area decreases as it is spaced upward from the active layer.

[0015] In addition, a light-emitting device may be provided, wherein at least a portion of the reflection area is disposed below either the first conductivity type semiconductor layer or the second conductivity type semiconductor layer.

[0016] Additionally, a light-emitting device may be provided in which the reflection region and the light-absorbing region contain carbon, and the carbon content in the light-absorbing region is higher than the carbon content in the reflection region.

[0017] Additionally, a light-emitting device may be provided in which the reflection region and the light-absorbing region are in contact with the side of the light-emitting element, and the area of ​​the side of the light-emitting element in contact with the reflection region is larger than the area of ​​the side of the light-emitting element in contact with the light-absorbing region.

[0018] In addition, a light-emitting device may be provided, further comprising a molding layer laminated to the light-emitting element and the light-absorbing region, wherein the reflectance of the reflection region is greater than the reflectance of the molding layer.

[0019] In addition, the above-mentioned reflection area may be provided with a light-emitting device including a filler.

[0020] Additionally, a light-emitting device may be provided, comprising: a light-emitting element that generates light; a substrate that supports the light-emitting element; a reflector located on the side of the light-emitting element that reflects light toward the light-emitting element; and an auxiliary layer laminated on the light-emitting element that diffuses light, wherein the color of the reflector viewed from above and the color of the reflector viewed from the side are different.

[0021] Additionally, the light-emitting device may be provided, comprising: a reflector that is positioned to the side of the light-emitting element and reflects light toward the light-emitting element; and an absorption area that is laminated to the reflector to cover the reflector and absorbs light.

[0022] Additionally, a light-emitting device may be provided, further comprising a molding layer covering the reflector and the auxiliary layer, wherein the refractive indices of the reflection area, the molding layer, and the auxiliary layer are different.

[0023] Additionally, a light-emitting device may be provided, comprising: a first light-emitting element that emits light; a second light-emitting element that emits light; a reflector disposed between the first light-emitting element and the second light-emitting element and reflecting light toward one or more of the first light-emitting element and the second light-emitting element; and a substrate supporting the reflector, the first light-emitting element, and the second light-emitting element, wherein the length of the surface of the reflector is greater than the distance between the first light-emitting element and the second light-emitting element.

[0024] Additionally, the light-emitting device may be provided such that when a predetermined value is calculated by dividing the length of a virtual extension line extending horizontally from the side of either the first light-emitting element or the second light-emitting element to the surface of the reflector and the height from the lower surface of the reflector to the extension line, the length increases and the height decreases as it moves toward the center along the surface of the reflector, thereby reducing the calculated value.

[0025] Additionally, the light-emitting device may be provided, wherein the reflector comprises: a reflective region that reflects light toward one or more of the first light-emitting element and the second light-emitting element; and an absorbing region that absorbs light and is laminated to the reflective region to cover the reflective region, and the width of the reflective region is greater than the distance between the first light-emitting element and the second light-emitting element.

[0026] In addition, a light-emitting device may be provided in which the width of the absorption region is equal to or smaller than the distance between the first light-emitting element and the second light-emitting element.

[0027] One embodiment of the present invention has the effect that the reflector can reduce light interference between a plurality of light-emitting elements, thereby enabling the formation of distinct contrast ratio and contrast.

[0028] In addition, since the reflector can reflect light toward the light-emitting element in one embodiment of the present invention, the light extraction efficiency can be increased.

[0029] In addition, since light can be absorbed in the absorption region, the light between adjacent light-emitting elements can be prevented from mixing with each other, and the color distinction between light-emitting elements can be made clearer.

[0030] In addition, since the auxiliary layer can diffuse or refract light, the light extraction efficiency can be improved. This has an effect in that the auxiliary layer can diffuse or refract light.

[0031] FIG. 1 is a drawing showing a light-emitting device according to a first embodiment of the present invention.

[0032] Figure 2 is an enlarged view of part A of Figure 1.

[0033] FIG. 3 is an enlarged view showing a first example of the upper and lower surfaces of the absorption region of FIG. 1.

[0034] Figure 4 is an enlarged view showing a second example of the upper and lower surfaces of the absorption region of Figure 1.

[0035] FIG. 5 is an enlarged view showing a third example of the upper and lower surfaces of the absorption region of FIG. 1.

[0036] FIG. 6 is a drawing showing a light-emitting device according to a second embodiment of the present invention.

[0037] FIG. 7 is a drawing showing a light-emitting device according to a third embodiment of the present invention.

[0038] FIG. 8 is a drawing showing a light-emitting device according to a fourth embodiment of the present invention.

[0039] Figure 9 is a drawing showing the light-emitting device of Figure 8 as viewed from above.

[0040] In the following description, numerous specific details are described for the purpose of explanation and to provide a complete understanding of the various embodiments or implementations of the present disclosure. As used herein, “Embodiments” and “Implementations” are interchangeable terms indicating non-limiting examples of devices or methods utilizing one or more of the concepts of the invention disclosed herein. However, it will be apparent that various embodiments may be implemented without utilizing these specific details or by utilizing one or more equivalent arrangements. In other examples, known structures and devices are illustrated in block diagram form to avoid unnecessarily obscuring the various embodiments. Furthermore, while various embodiments may differ from one another, they do not need to be exclusive. For example, specific shapes, configurations, and characteristics of an embodiment may be used or implemented in other embodiments without departing from the scope of the concept of the invention.

[0041] Unless otherwise specified, the illustrated embodiments should be understood as providing exemplary features of varying details in some ways in which the concept of the present invention can actually be realized. Therefore, unless otherwise specified, features, components, modules, layers, membranes, panels, regions and / or modes of various embodiments (hereinafter referred to individually or collectively as “elements”) may be combined, separated, interchanged, and / or rearranged differently without departing from the scope of the concept of the present invention.

[0042] The use of cross-hatching and / or shading in the attached drawings is generally provided to clarify the boundaries between adjacent elements. As such, the presence or absence of cross-hatching or shading, unless otherwise specified, does not imply or indicate any preference or requirement regarding the specific material, material properties, dimensions, proportions, commonalities between the exemplified elements, or any other features, attributes, and characteristics of the elements. Additionally, in the attached drawings, the size and relative size of the elements may be exaggerated for clarity and / or illustrative purposes. When embodiments are implemented differently, specific process sequences may be performed differently from the described order. For example, two consecutively described processes may be performed substantially simultaneously or in an order opposite to the described order. Also, the same reference numerals indicate the same elements.

[0043] When an element such as a layer is referred to as being "on", "connected to," or "coupled to" another element or layer, said element may be directly on, connected to, or coupled to the other element or layer, or an interposed element or layer may exist. However, when an element or layer is referred to as being "directly on", "directly connected to," or "directly coupled to" another element or layer, no interposed element or layer exists. To this end, the term "connected" may refer to a physical, electrical, and / or fluid connection with or without an interposed element. Furthermore, the DR1-axis, DR2-axis, and DR3-axis are not limited to the three axes of an orthogonal 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 each other, or they may represent different directions that are not perpendicular to each other. For the purposes of this disclosure, “one or more of X, Y, and Z” and “one or more 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. As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed articles.

[0044] Although terms such as “first,” “second,” etc., may be used herein to describe various forms of elements, these elements shall not be limited by these terms. These terms are used to distinguish one element from another. Therefore, the first element discussed below may be named the second element without departing from the teachings of the present disclosure.

[0045] Spatially relative terms such as “below,” “under,” “immediately below,” “lower,” “above,” “upper,” “upper,” “higher,” and “side” (e.g., as in “side wall”) may be used for descriptive purposes and thereby to describe the relationship between one element and another element(s) as illustrated in the drawings. Spatially relative terms are intended to include different orientations of the device in use, operation, and / or manufacture in addition to the orientations illustrated in the drawings. For example, if the device in the drawings is inverted, the element described as “below” or “under” another element or feature will be oriented “above” the other element or feature. Therefore, the exemplary term “below” may include both upper and lower orientations. Additionally, the device may be oriented differently (e.g., rotated 90° or oriented in a different orientation), and thus, spatially relative descriptors used herein may also be interpreted accordingly.

[0046] The technical terms used in this specification are intended to describe specific embodiments and are not limiting. The singular form used in this specification also includes the plural form unless the context clearly indicates otherwise. Additionally, the terms “comprising,” “comprising,” “comprising,” and / or “comprising” used in this specification specify the presence of the mentioned features, integers, steps, operations, elements, components, and / or groups thereof, but do not exclude 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 used in this specification are used to indicate approximation rather than degree, and are used to describe inherent deviations of measured, calculated, and / or provided values ​​that may be recognized by a person of ordinary knowledge in the art.

[0047] Various embodiments are described below with reference to cross-sectional and / or exploded drawings, which are schematic examples of idealized embodiments and / or intermediate structures. As such, variations from the shapes in the drawings may be expected, for example, as a result of manufacturing techniques and / or tolerances. Therefore, the embodiments disclosed herein should not be interpreted as being limited to the shapes of specific illustrated regions, but should be interpreted to include, for example, deviations in shape resulting from manufacturing. In this way, the regions illustrated in the drawings may be schematic in nature, and the shapes of these regions may not reflect the actual shapes of the regions of the device, and thus are not intended to have a limiting meaning.

[0048] As is customary 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 understand 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 manufacturing technology or other manufacturing technology. Where 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 may optionally be driven by firmware and / or software. Additionally, each block, unit, and / or module may be implemented by dedicated hardware, or as a combination of dedicated hardware for performing some functions and a processor for performing other functions (e.g., one or more programmed processors and associated circuits). Additionally, each of 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 concept 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 concept of the present invention.

[0049] Unless otherwise defined, all terms used herein (including technical or scientific terms) have the same meaning as commonly understood by those skilled in the art to which this disclosure pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with that meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this specification.

[0050] A light emitting apparatus (1) according to the first embodiment of the present invention will be described below.

[0051] Referring to FIG. 1, a light-emitting device (1) according to the first embodiment of the present invention can display characters, symbols, images, or video. Additionally, the light-emitting device (1) can be mounted on a vehicle. Such a light-emitting device (1) may be included in a taillight, headlight, rear lamp, tail lamp, interior light, etc. Additionally, the light-emitting device (1) mounted on the vehicle can emit light of a red spectrum, light of a yellow spectrum, or light of a white spectrum to display information such as a stop signal or characters to the outside. Such a light-emitting device (1) may be a high-quality display device with distinct contrast and a distinct contrast ratio by reducing light interference between a plurality of light-emitting elements (100) and minimizing interference between driving areas. The light-emitting device (1) may include a light-emitting element (100), a reflector (200), and a substrate (300).

[0052] A light-emitting element (100) can be supported on a substrate (300) to generate light. For example, the light-emitting element (100) can generate any one of red light having a peak wavelength at 600 nm to 750 nm, green light having a peak wavelength at 490 nm to 570 nm, and blue light having a peak wavelength at 400 nm to 490 nm. The light-emitting element (100) may include a first conductivity type semiconductor layer (100a), an active layer (100b), a second conductivity type semiconductor layer (100c), and a transparent layer (100d).

[0053] The first conductivity semiconductor layer (100a) may contain p-type impurities (e.g., Mg, Sr, Ba). In other words, the first conductivity semiconductor layer (100a) may be a p-type semiconductor layer. However, this is merely an example, and the first conductivity semiconductor layer (100a) may contain n-type impurities. Additionally, the first conductivity semiconductor layer (100a) may be electrically connected to a substrate through a wire, an electrode (W), etc.

[0054] The active layer (100b) may be disposed on the first conductivity semiconductor layer (100a). In other words, the active layer (100b) may be located between the first conductivity semiconductor layer (100a) and the second conductivity semiconductor layer (100c). Additionally, the first conductivity semiconductor layer (100a) and the active layer (100b) may form a mesa.

[0055] The second conductivity semiconductor layer (100c) may contain n-type impurities (e.g., Si, Ge, Sn). This second conductivity semiconductor layer (100c) may be an n-type semiconductor layer. However, this is merely an example, and the second conductivity semiconductor layer (100c) may contain p-type impurities. Additionally, the second conductivity semiconductor layer (100c) may be electrically connected to a substrate through a wire, an electrode (W), etc.

[0056] The transparent layer (100d) may be laminated onto the second conductive semiconductor layer (100c). The transparent layer (100d) may be an insulating or conductive substrate, or an insulating or conductive substrate joined by bonding. Additionally, the transparent layer (100d) may be an insulating or conductive substrate for growing the first conductive semiconductor layer (100a), the active layer (100b), and the second conductive semiconductor layer (100c). For example, the transparent layer (100d) may include one or more of a silicon carbide substrate, a silicon substrate, a gallium nitride substrate, an aluminum nitride substrate, and a sapphire substrate.

[0057] Additionally, irregularities may be formed on the side of the light-emitting element (100). The irregularities may be formed on the periphery of the light-emitting element (100), but are not limited thereto. Additionally, the side of the light-emitting element (100) may be formed at an angle. The width of the light-emitting element (100) may increase as it extends upward. Furthermore, the light-emitting element (100) may be arranged in multiple numbers on the substrate (300). The multiple light-emitting elements (100) may generate light of different peak wavelengths. The multiple light-emitting elements (100) may include a first light-emitting element (110) and a second light-emitting element (120).

[0058] The first light-emitting element (110) may be supported on a substrate (300) so as to be spaced apart from the second light-emitting element (120). The first light-emitting element (110) may be surrounded by a reflector (200). The distance (L1) between the first light-emitting element (110) and the second light-emitting element (120) may be smaller than the width (L2) of the reflection area (210) of the reflector (200), which will be described later. The reflection efficiency may be increased by securing a wider width (L2) of the reflection area (210).

[0059] Additionally, the separation distance (L1) between the first light-emitting element (110) and the second light-emitting element (120) may be equal to or smaller than the width of the light-absorbing region (220) to be described later. Additionally, the horizontal separation distance (L1) between the first light-emitting element (110) and the second light-emitting element (120) may be smaller than the surface length of the reflector (200). If the surface length of the reflector (200) increases, the internal total reflection rate that may occur on the surface of the reflector (200) increases, thereby increasing the probability that light is trapped inside the reflector (200).

[0060] The second light-emitting element (120) may be supported on the substrate (300) and may emit light with a peak wavelength similar to that of the first light-emitting element (110). Alternatively, the second light-emitting element (120) may be supported on the substrate (300) and may emit light with a peak wavelength different from that of the first light-emitting element (110). The second light-emitting element (120) may be surrounded by a reflector (200).

[0061] A reflector (200) is supported on a substrate (300) so as to be positioned on the side of a plurality of light-emitting elements (100), and can reflect light irradiated laterally from the plurality of light-emitting elements (100) toward the plurality of light-emitting elements (100). For example, the reflector (200) may be positioned between the plurality of light-emitting elements (100). Additionally, the reflector (200) may be formed in multiple numbers and positioned on the outside of the plurality of light-emitting elements (100). Such a reflector (200) may be configured so that the color of the reflector (200) viewed from above and the color of the reflector (200) viewed from the side are different. The brightness of the reflector (200) viewed from above may be lower than the brightness viewed from the side. The color of the reflector (200) viewed from above may be black. Light can be absorbed from the upper side of the reflector (200). Additionally, the color of the reflector (200) when viewed from the side may be transparent or white. Light can be reflected from the side of the reflector (200). Therefore, the light extraction efficiency is increased inside the reflector (200), and since light can be absorbed from the upper side, the contrast can be increased.

[0062] The difference in light intensity of the light generated from the light-emitting element (100) by the reflector (200) may be 0.015 or less. The difference in light intensity may be the difference in light intensity between the light generated from the light-emitting element (100) that is irradiated upward and the light generated from the light-emitting element (100) that is irradiated in a direction offset from the upward direction. For example, the angle between the light irradiated upward and the light irradiated in a direction offset from the upward direction may be 50 to 80°.

[0063] The rate of change in brightness of the light generated from the light-emitting element (100) by the reflector (200) may be 50% or less. The rate of change in brightness may be the rate of change in brightness between the light irradiated upward among the light of the light-emitting element (100) and the light irradiated in a direction offset from the upward among the light generated from the light-emitting element (100). For example, the angle between the light irradiated upward and the light irradiated in a direction offset from the upward may be 50 to 80°.

[0064] Referring further to FIG. 2, the reflector (200) can be configured such that when a predetermined value is calculated by dividing a predetermined length (a) extended in the horizontal direction and a predetermined height (b) extended in the vertical direction, the length (a) increases and the height (b) decreases as it moves toward the center along the surface of the reflector (200), thereby reducing the calculated value. The predetermined length (a) is the length of a virtual extension line extending horizontally from the side of either the first light-emitting element (110) or the second light-emitting element (120) to the surface of the reflector (200). The predetermined height (b) is the height from the bottom surface of the reflector (200) to the extension line. The calculated value is the value obtained by dividing the height (b) by the length (a). Additionally, the length (a) of the extension line may decrease and the height (b) may increase as it moves toward the light-emitting element (100) along the surface of the reflector (200).

[0065] Additionally, the reflector (200) may include a reflection area (210) and an absorption area (220).

[0066] The reflective area (210) is positioned to contact one or more sides of a plurality of light-emitting elements (100) so as to reflect light toward one or more of the plurality of light-emitting elements (100). For example, the color of the reflective area (210) may be white. The reflectance of the reflective area (210) may be formed to be greater than the reflectance of the transparent layer (100d). Light reflected from such a reflective area (210) may pass through the light-emitting element (100). The reflective area (210) may include acrylic, silicone, epoxy-based materials, a filler (211) to increase reflectivity, etc. The filler (211) may be TiO2 and SiO2 It may include one or more of the above. Additionally, the reflection area (210) may include carbon. The carbon content of the reflection area (210) may be smaller than the carbon content of the absorption area (220). Alternatively, the weight percentage (wt%) of carbon in the reflection area (210) may be smaller than the weight percentage (wt%) of carbon in the absorption area (220). Alternatively, the atomic percentage (at%) of carbon in the reflection area (210) may be smaller than the atomic percentage (at%) of carbon in the absorption area (220). Thus, the difference in transmittance and reflectance between the absorption area (220) and the reflection area (210) may be large.

[0067] The reflection area (210) can be formed such that its thickness decreases toward the center. Additionally, the thickness of the reflection area (210) can be formed to be greater than the thickness of the light absorption area (220). In other words, the area of ​​the side of the light-emitting element (100) where the reflection area (210) contacts can be formed to be larger than the area of ​​the side of the light-emitting element (100) where the light absorption area (220) contacts. The width of the reflection area (210) can be reduced as it is spaced upward from the active layer (100b). Therefore, the loss of light emitted from the active layer (100b) can be reduced. Additionally, at least a portion of the reflection area (210) can be placed below one or more of the first conductivity semiconductor layer (100a) and the second conductivity semiconductor layer (100c). In other words, one side of the reflection area (210) may be positioned on the side of the electrode (W) electrically connected to the first conductive semiconductor layer (100a). The other side, opposite to the one side of the reflection area (210), may be positioned on the side of the electrode (W) electrically connected to the second conductive semiconductor layer (100c). The width (L2) of this reflection area (210) may be formed to be larger than the separation distance (L1) between the second light-emitting element (120) and the first light-emitting element (110).

[0068] Referring further to FIGS. 3 to 5, the light absorption region (220) can absorb light. The light absorption region (220) can be positioned above the reflection region (210) to cover the reflection region (210). This light absorption region (220) can prevent the reflection region (210) from being exposed when viewed from above. The color of the light absorption region (220) may be black. For example, the light absorption region (220) may be laminated onto the reflection region (210). In other words, the light absorption region (220) and the reflection region (210) may be separated into separate layers. Thus, since light can be refracted by the interface between the light absorption region (220) and the reflection region (210), the amount of light re-incident into the reflection region (210) can be increased, and the emission of light to the outside of the reflection region (210) can be prevented. As another example, the light absorption region (220) and the reflection region (210) can be formed integrally. Thus, the bonding strength between the light absorption region (220) and the reflection region (210) can be increased.

[0069] The interface between the absorption region (220) and the reflection region (210) may be non-uniform. The roughness of the upper surface of the absorption region (220) and the roughness of the lower surface of the absorption region (220) may be different from each other.

[0070] As a first example, the upper surface of the light absorption region (220) may be formed as a curved surface. Additionally, roughness may be formed on the lower surface of the light absorption region (220).

[0071] As a second example, the rate of change in roughness of the upper surface of the absorption region (220) may be greater than the rate of change in roughness of the lower surface of the absorption region (220). Here, the rate of change is considered greater when there are more peaks and valleys of roughness relative to the same horizontal area. Therefore, the surface area of ​​the reflector (200) can be increased to make it appear darker when viewed from above.

[0072] As a third example, the lower surface of the light absorption region (220) may be formed as a curved surface. Additionally, the upper surface of the light absorption region (220) may have roughness. Thus, the absorbance can be controlled by making the thickness of the light absorption region (220) non-uniform.

[0073] The width of the light absorption region (220) may be equal to or smaller than the distance (L1) between the first light-emitting element (110) and the second light-emitting element (120). The surface length of the light absorption region (220) may be formed to be longer than the horizontal distance (L1) between the first light-emitting element (110) and the second light-emitting element (120). Since the light absorption area can be increased by the surface length of the light absorption region (220), the relative clarity of the light generated from the first light-emitting element (110) and the second light-emitting element (120) can be increased.

[0074] The substrate (300) can support a plurality of light-emitting elements (100) and a reflector (200). The substrate (300) can be electrically connected to a plurality of light-emitting elements (100) through an electrode (W). The substrate (300) may be a substrate in which glass or paper is bonded to an insulating layer composed of PI (Polyimide), BT (Bismaleimide / Triazine), Teflon, PMMA, PC (Polycarbonate), etc., and may have a wiring portion made of metals and metal compounds such as Cu, Al, Ag, Au, Ni, W, etc. added thereon. The substrate (300) may be a printed circuit board (PCB) containing metal wiring.

[0075] Hereinafter, the operation and effect of the light-emitting device (1) according to the first embodiment of the present invention will be described.

[0076] Light generated from a light-emitting element (100) according to the first embodiment of the present invention may be irradiated upward or irradiated sideways. A reflector (200) is positioned sideways from the light-emitting element (100) and can reflect light irradiated sideways from the light-emitting element (100) toward the light-emitting element (100). Light reflected from such a reflector (200) can pass through the light-emitting element (100).

[0077] With such a reflector (200), light interference between multiple light-emitting elements (100) can be reduced, so a contrast ratio and contrast can be clearly formed.

[0078] In addition, since the reflector (200) can reflect light toward the light-emitting element (100), the light extraction efficiency can be increased.

[0079] In addition, since light can be absorbed in the absorption region (220), the mixing of light between adjacent light-emitting elements (100) can be prevented, and the color distinction between light-emitting elements (100) can be made clearer.

[0080] Additionally, since a filler (211) may be included in the reflection area (210), the reflectivity of the reflection area (210) may be increased.

[0081] Hereinafter, with reference to FIG. 6, a light-emitting device (1) according to a second embodiment of the present invention will be described. In describing the second embodiment, there is a difference in that it further includes a molding layer (400), and this difference will be explained mainly.

[0082] The light-emitting device (1) may further include a molding layer (400). The molding layer (400) may be laminated to a reflector (200) and a plurality of light-emitting elements (100). In other words, the molding layer (400) may cover a plurality of light-emitting elements (100) and an absorption region (220). Light from a plurality of light-emitting elements (100) may be transmitted through the molding layer (400). The reflectance of the molding layer (400) may be formed to be lower than the reflectance of the reflection region (210). The refractive indices of the molding layer (400), the reflection region (210), and the transmission layer (100d) may be different. For example, the refractive index of the molding layer (400) may be 1.4 to 1.6, the refractive index of the reflection area (210) may be 1.3 to 1.5, and the refractive index of the transmission layer (100d) may be 1.6 to 1.8.

[0083] Hereinafter, the operation and effect of the light-emitting device (1) according to the second embodiment of the present invention will be described.

[0084] Light generated from the light-emitting element (100) according to the second embodiment of the present invention may be irradiated upward and pass through the molding layer (400), or irradiated sideways. A reflector (200) is positioned sideways from the light-emitting element (100) and can reflect light irradiated sideways from the light-emitting element (100) toward the light-emitting element (100). Light reflected from such a reflector (200) can pass through the light-emitting element (100) and the molding layer (400).

[0085] The molding layer (400) can cover the light-emitting element (100), so the light-emitting element (100) can be protected.

[0086] Hereinafter, with reference to FIG. 7, a light-emitting device (1) according to a third embodiment of the present invention will be described. In describing the third embodiment, there is a difference in that an auxiliary layer (500) is further included, and this difference will be explained mainly.

[0087] The auxiliary layer (500) can be laminated to the light-emitting element (100) to diffuse or refract light. The auxiliary layer (500) can be covered by a molding part. For example, the auxiliary layer (500) may be a lens or a film containing a diffuser. The shape of the auxiliary layer (500) when viewed from the side and the shape of the auxiliary layer (500) when viewed from above may be formed differently. When viewed from the side, the auxiliary layer (500) may have a semicircular shape. Additionally, when viewed from above, the auxiliary layer (500) may have a rectangular shape.

[0088] The auxiliary layer (500) may be located between the light absorption regions (220) of a plurality of reflectors (200). In other words, the auxiliary layer (500) may be surrounded by the light absorption regions (220) when viewed from above. The refractive index of this auxiliary layer (500) may be different from the refractive index of the reflection region (210), the molding layer (400), and the transmission layer (100d). For example, the refractive index of the auxiliary layer (500) may be 1.5 to 1.7.

[0089] The auxiliary layer (500) can be located within the region of the light-emitting element (100). Thus, light can be effectively concentrated.

[0090] Hereinafter, the operation and effect of the light-emitting device (1) according to the third embodiment of the present invention will be described.

[0091] Light generated from the light-emitting element (100) according to the third embodiment of the present invention can sequentially pass through the auxiliary layer (500) and the molding layer (400). Additionally, light reflected from the reflector (200) can also sequentially pass through the light-emitting element (100), the auxiliary layer (500), and the molding layer (400).

[0092] Since this auxiliary layer (500) can diffuse or refract light, the light extraction efficiency can be improved.

[0093] Hereinafter, with reference to FIGS. 8 and 9, a light-emitting device according to the fourth embodiment of the present invention will be described. In describing the fourth embodiment, there are differences in that the upper surface of the light-absorbing region (220) may be positioned higher than the upper surface of the light-emitting element (100) and that an opening (221) may be formed in the light-absorbing region (220). These differences will be explained in detail.

[0094] The upper surface of the reflection area (210) may be positioned at a location similar to or the same as the upper surface of the transmission layer (100d). This reflection area (210) may be formed such that the upper surface of the light absorption area (220) is positioned above the upper surface of the transmission layer (100d).

[0095] An opening (221) for exposing the light-emitting element (100) to the outside may be formed in the light-absorbing region (220). The inner surface of the light-absorbing region (220) may be spaced apart from the light-emitting element (100). Additionally, the inner surface of the light-absorbing region (220) may be positioned to surround the edge of the light-emitting element (100) when viewed from above. The inner surface of the light-absorbing region (220) may be circular when viewed from above. The opening (221) of the light-absorbing region (220) can prevent the appearance of an uneven appearance even if at least one of the plurality of light-emitting elements (100) is rotated or tilted and arranged unevenly when a plurality of light-emitting elements (100) are mounted.

[0096] Additionally, the opening (221) of the light absorption region (220) may expose a portion of the reflection region (210) to the outside. This opening (221) may emit light scattered, diffused, or reflected from the reflection region (210) to the outside. If the multiple light-emitting elements (100) are formed with different positions or shapes, their external light-emitting shapes (shapes) may be formed differently. Since the opening (221) can emit light from the reflection region (210), a uniform light-emitting shape can be achieved even if the light-emitting shape of any one of the multiple light-emitting elements (100) is formed differently.

[0097] A portion of the molding layer (400) may penetrate the opening (221) and be laminated onto one or more of the reflection area (210), the light-emitting element (100), and the auxiliary layer (500).

[0098] Hereinafter, the operation and effect of the light-emitting device (1) according to the fourth embodiment of the present invention will be described.

[0099] The opening (221) of the light absorption region (220) can prevent the appearance of being uneven even if at least one of the plurality of light-emitting elements (100) is rotated or tilted and arranged unevenly when the plurality of light-emitting elements (100) are mounted.

[0100] In addition, since the opening (221) of the absorption region (220) can emit light from the reflection region (210), a uniform light emission shape can be realized even if the light emission shape of any one of the plurality of light-emitting elements (100) is formed differently.

[0101] Although the embodiments of the present invention have been described above as specific embodiments, they are merely examples and the present invention is not limited thereto, but should be interpreted as having the broadest scope in accordance with the technical concept disclosed in this specification. Those skilled in the art may implement patterns of shapes not specified by combining or substituting the disclosed embodiments, and this also does not deviate from the scope of the present invention. Furthermore, those skilled in the art may easily modify or alter the disclosed embodiments based on this specification, and it is evident that such modifications or alterations also fall within the scope of the rights of the present invention.

Claims

1. A light-emitting element that generates light; A reflector disposed on the side of the light-emitting element and reflecting light toward the light-emitting element; and It includes a substrate supporting the light-emitting element and the reflector, The color of the reflector viewed from the side has an area different from the color of the reflector viewed from above. Light-emitting device.

2. In Paragraph 1, The color of the above reflector when viewed from above is black, and The color of the above reflector when viewed from the side is white, Light-emitting device.

3. In Paragraph 1, The luminous intensity deviation of the light generated from the above light-emitting element is 0.015 or less, and The above luminous intensity deviation is the luminous intensity deviation between the light irradiated upward among the light generated from the light-emitting element and the light irradiated in a direction offset from the upward among the light generated from the light-emitting element, Light-emitting device.

4. In Paragraph 1, The rate of change in brightness of light generated from the above light-emitting element is 50% or less, and The above luminance change rate is the luminance change rate between the light irradiated upward among the light generated from the light-emitting element and the light irradiated in a direction offset from the upward among the light generated from the light-emitting element, Light-emitting device.

5. In Paragraph 1, The above reflector is, A reflection region disposed on the side of the light-emitting element and reflecting light toward the light-emitting element; and A light-absorbing region that covers the reflection region and absorbs light, Light-emitting device.

6. In Paragraph 5, The thickness of the reflection region is greater than the thickness of the absorption region. Light-emitting device.

7. In Paragraph 5, The reflection region and the light absorption region are formed integrally, and The interface between the reflection region and the absorption region is non-uniform, Light-emitting device.

8. In Paragraph 5, The above light-emitting element is, First conductivity type semiconductor layer; An active layer stacked on the first conductivity type semiconductor layer; and It includes a second conductivity type semiconductor layer stacked on the above active layer, and The width of the reflection area decreases as it is spaced upward from the active layer. Light-emitting device.

9. In Paragraph 8, At least a portion of the above-mentioned reflection area is, A plurality disposed on the lower side of either the first conductivity type semiconductor layer and the second conductivity type semiconductor layer. Light-emitting device.

10. In Paragraph 5, The above reflection region and the above absorption region include carbon, and The carbon content in the absorption region is higher than the carbon content in the reflection region. Light-emitting device.

11. In Paragraph 5, The reflection region and the light absorption region are in contact with the side of the light-emitting element, and The area on the side of the light-emitting element where the reflection region contacts is, Among the sides of the light-emitting element, the area where the absorption region contacts is larger than the area where the absorption region contacts. Light-emitting device.

12. In Paragraph 5, The above-mentioned light-emitting element and the above-mentioned light-absorbing region further include a molding layer laminated thereon, The reflectance of the above reflection area is greater than the reflectance of the above molding layer, Light-emitting device.

13. In Paragraph 5, The above reflection area includes a filler, Light-emitting device.

14. Light-emitting element that generates light; A substrate supporting the above-mentioned light-emitting element; A reflector located to the side of the light-emitting element and reflecting light toward the light-emitting element; and It includes an auxiliary layer that is laminated to the light-emitting element and diffuses light, and The color of the reflector viewed from above and the color of the reflector viewed from the side are different. Light-emitting device.

15. In Paragraph 14, The above reflector is, A reflection region disposed on the side of the light-emitting element and reflecting light toward the light-emitting element; and A light-absorbing region that absorbs light and is laminated to the reflection region to cover the reflection region. Light-emitting device.

16. In Paragraph 15, It further includes a molding layer covering the reflector and the auxiliary layer, The refractive indices of the reflection region, the molding layer, and the auxiliary layer are different. Light-emitting device.

17. A first light-emitting element that generates light; A second light-emitting element that generates light; A reflector disposed between the first light-emitting element and the second light-emitting element and reflecting light toward one or more of the first light-emitting element and the second light-emitting element; and It includes the above-mentioned reflector, the above-mentioned first light-emitting element, and the above-mentioned second light-emitting element, and a substrate supporting the above-mentioned first light-emitting element. The length of the surface of the above reflector is greater than the distance between the first light-emitting element and the second light-emitting element, Light-emitting device.

18. In Paragraph 17, The above reflector is, When a predetermined value is calculated by dividing the length of a virtual extension line extending horizontally from the side of either the first light-emitting element or the second light-emitting element to the surface of the reflector and the height from the lower surface of the reflector to the extension line, the length increases and the height decreases as it moves toward the center along the surface of the reflector, thereby configuring the calculated value to decrease. Light-emitting device.

19. In Paragraph 17, The above reflector is, A reflection region that reflects light toward one or more of the first light-emitting element and the second light-emitting element; and It includes an absorption region that absorbs light and is laminated to the reflection region to cover the reflection region, and The width of the reflection area is greater than the separation distance between the first light-emitting element and the second light-emitting element. Light-emitting device.

20. In Paragraph 19, The width of the absorption region is equal to or smaller than the distance between the first light-emitting element and the second light-emitting element. Light-emitting device.

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