Light-emitting device

Abstract

According to one aspect of the present invention, a light-emitting device may be provided, the device comprising: a substrate; a light-emitting element disposed on the substrate to generate light; and a light-absorbing filler configured to absorb the light such that, when a calculated spectrum is derived on the basis of a preset function and a spectrum of the light generated from the light-emitting element, the area of a predetermined reference wavelength band in the calculated spectrum does not exceed a threshold value, relative to the area of the entire wavelength band of the calculated spectrum.

Description

light-emitting device

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

[0002] A light-emitting device can emit light to display characters, symbols, images, or video on a display.

[0003] Such a light-emitting device includes a light-emitting surface, and light must be emitted evenly across the entire surface for characters, symbols, images, or videos displayed on the screen to be displayed more clearly. In other words, the higher the surface light emission efficiency of the light-emitting device, the clearer the characters, symbols, images, or videos displayed on the screen can be shown.

[0004] As concerns grow regarding visual fatigue, disruption of circadian rhythms, and potential retinal damage caused by short-wavelength light, there is a growing need to develop light-emitting devices that optimize radiation characteristics within a specific wavelength range.

[0005] The present invention aims to provide a light-emitting device capable of efficiently absorbing light of a predetermined wavelength range.

[0006] The present invention can provide a high-quality light-emitting device by improving color brightness and color reproduction rate.

[0007] The present invention can provide a high-quality light-emitting device by increasing color contrast.

[0008] The present invention can provide a light-emitting device with improved reliability by absorbing high-energy light to reduce yellowing or light damage caused by light.

[0009] The present invention can provide a light-emitting device that improves the risk of blue light.

[0010] The present invention can provide a high-quality light-emitting device with improved color reproducibility.

[0011] According to one aspect of the present invention, a light-emitting device may be provided, comprising: a substrate; a light-emitting element disposed on the substrate and generating light; and an absorption filler configured to absorb the light such that when a calculated spectrum is calculated based on the spectrum of light generated from the light-emitting element and a preset setting function, the area of ​​a predetermined reference wavelength band in the calculated spectrum is formed to be less than or equal to a threshold value relative to the area of ​​the entire wavelength band in the calculated spectrum, wherein the predetermined reference wavelength band has a lower limit value smaller than the peak wavelength of the calculated spectrum and an upper limit value larger than the peak wavelength of the calculated spectrum.

[0012] In addition, a light-emitting device may be provided in which the threshold value is 10% to 15%.

[0013] In addition, the area of ​​the entire wavelength band is calculated based on the following mathematical formula 1, and

[0014] [Mathematical Formula 1]

[0015]

[0016] In mathematical equation 1, λ is the wavelength, and Φ λ A light-emitting device may be provided, wherein is the spectral intensity of light emitted from a light-emitting element (200), B(λ) is the light spectrum risk function which is the setting function, a is the smallest first wavelength in the entire wavelength range, and b is the largest second wavelength in the entire wavelength range.

[0017] In addition, the area of ​​the above reference wavelength band is calculated based on the following mathematical formula 2, and

[0018] [Mathematical Formula 2]

[0019]

[0020] In the above mathematical formula 2, λ is the wavelength, and Φ λ A light-emitting device may be provided, wherein is the spectral intensity of light emitted from a light-emitting element, B(λ) is a light spectral risk function, c is a first reference wavelength, and d is a second reference wavelength.

[0021] In addition, the area of ​​the reference wavelength band and the area of ​​the entire wavelength band satisfy the following mathematical formula 3, and

[0022] [Mathematical Formula 3]

[0023]

[0024] A light-emitting device may be provided in which y is the ratio of the area of ​​the reference wavelength band to the area of ​​the total wavelength band.

[0025] In addition, a light-emitting device may be provided in which the first wavelength is 380 nm and the second wavelength is 780 nm.

[0026] In addition, a light-emitting device may be provided in which the second reference wavelength is 430 nm.

[0027] In addition, a light-emitting device may be provided in which the wavelength of the peak of the above-mentioned setting function is greater than the wavelength of the peak of the spectrum of light generated from the light-emitting element.

[0028] According to one aspect of the present invention, a light-emitting device may be provided, further comprising: a wavelength converter disposed on a substrate and covering the light-emitting element; and a light-transmitting layer disposed in at least one region of the wavelength converter.

[0029] In addition, the light-absorbing filler may be provided as a light-emitting device disposed in one or more of the wavelength converter and the light-transmitting layer.

[0030] In addition, a light-emitting device may be provided in which the wavelength converter and the light-transmitting layer are spaced apart in the vertical direction.

[0031] According to one aspect of the present invention, a light-emitting device may be provided, wherein the light-emitting element is formed in a plurality of such elements, and the plurality of light-emitting elements comprises: a first light-emitting element configured to generate blue light; and a second light-emitting element configured to generate green light. According to one aspect of the present invention, a light-emitting device may be provided, comprising: a base mill, a substrate including a side wall extending upward from the edge of the base; a light-emitting element disposed on the substrate to generate light; a molding portion for covering the light-emitting element; a wavelength converter disposed on at least one region of the molding portion and at least one region of the side wall to convert the wavelength of light; and an absorption filler disposed on the molding portion and the wavelength converter to absorb a portion of the light.

[0032] Additionally, a light-emitting device may be provided, wherein the light-emitting elements are formed in a plurality of numbers, and the plurality of light-emitting elements include a first light-emitting element configured to generate blue light; a second light-emitting element configured to generate green light; and a third light-emitting element configured to generate red light.

[0033] According to one aspect of the present invention, a light-emitting device may be provided, comprising: a substrate including a sidewall extending upward from the edge of the base mill; a light-emitting element disposed on the substrate to generate light; a molding portion for covering the light-emitting element; a light-transmitting layer disposed in at least one area of ​​the molding portion to transmit light; and a light-absorbing filler disposed in the light-transmitting layer to absorb a portion of the light.

[0034] In addition, a light-emitting device may be provided in which the molding part and the light-transmitting layer are spaced apart in the vertical direction.

[0035] Additionally, a light-emitting device may be provided, further comprising a wavelength converter disposed on the molding part and the side wall to be positioned between the molding part and the light-transmitting layer to convert the wavelength of light.

[0036] In addition, a light-emitting device may be provided in which the light-transmitting layer and the wavelength converter are spaced apart in the vertical direction.

[0037] Additionally, a light-emitting device may be provided, further comprising a wavelength converter that covers the upper surface of the base and the light-emitting element so that the upper surface of the base and the light-emitting element are spaced apart from the molding portion.

[0038] Additionally, a light-emitting device may be provided, wherein the light-emitting elements are formed in a plurality of numbers, and the plurality of light-emitting elements include a first light-emitting element configured to generate blue light; a second light-emitting element configured to generate green light; and a third light-emitting element configured to generate red light.

[0039] The present invention can provide a light-emitting device that enhances light safety by reducing light in wavelength ranges that may be harmful to the body.

[0040] The present invention can provide a high-quality light-emitting device by improving color brightness and color reproduction rate.

[0041] The present invention can provide a high-quality light-emitting device by increasing color contrast.

[0042] The present invention can provide a light-emitting device with improved reliability by absorbing high-energy light to reduce yellowing or light damage caused by light.

[0043] The present invention can provide a light-emitting device with improved reliability by improving damage caused by heat.

[0044] The present invention can provide a high-luminance light-emitting device by improving the phosphor conversion light extraction efficiency.

[0045] FIG. 1 is a drawing showing the appearance of a light-emitting device according to a first embodiment of the present invention.

[0046] Figure 2 is a drawing showing the appearance of the light-absorbing filler of the light-emitting device of Figure 1.

[0047] FIG. 3 is a diagram showing a light-transmitting layer of a light-emitting device according to a second embodiment of the present invention disposed in at least one region of a wavelength converter.

[0048] FIG. 4 is a diagram showing the light-transmitting layer and the wavelength converter of a light-emitting device according to a second embodiment of the present invention arranged spaced apart from each other.

[0049] FIG. 5 is a drawing showing a light-absorbing filler arranged in the molding part of a light-emitting device according to the third embodiment of the present invention.

[0050] FIG. 6 is a drawing showing the arrangement of an absorption filler in a wavelength converter of a light-emitting device according to a third embodiment of the present invention.

[0051] FIG. 7 is a drawing showing a light-absorbing filler arranged in the light-transmitting layer of a light-emitting device according to the fourth embodiment of the present invention.

[0052] FIG. 8 is a diagram showing the light-transmitting layer and the wavelength converter of a light-emitting device according to the fourth embodiment of the present invention arranged spaced apart from each other.

[0053] FIG. 9 is a drawing showing a wavelength converter of a light-emitting device according to the fourth embodiment of the present invention, with the wavelength converter positioned on the lower side of the molding part.

[0054] FIG. 10 is a diagram showing examples of the light spectrum of the light-emitting device of the second to fourth embodiments of the present invention.

[0055] FIG. 11 is a diagram showing the wavelength converter of a light-emitting device according to the fifth embodiment of the present invention covering a first light-emitting element and a second light-emitting element.

[0056] FIG. 12 is a diagram showing a light-transmitting layer disposed in at least one region of a wavelength converter of a light-emitting device according to the fifth embodiment of the present invention.

[0057] FIG. 13 is a drawing showing the wavelength converter and the light-transmitting layer of a light-emitting device according to the fifth embodiment of the present invention arranged spaced apart from each other.

[0058] FIG. 14 is a diagram showing an example of the spectrum of light generated in a light-emitting device of the fifth embodiment of the present invention.

[0059] FIG. 15 is a drawing showing the molding part of a light-emitting device according to the 6th embodiment of the present invention covering a first light-emitting element, a second light-emitting element, and a third light-emitting element.

[0060] FIG. 16 is a drawing showing a light-absorbing filler arranged in a light-transmitting layer of a light-emitting device according to the 6th embodiment of the present invention.

[0061] FIG. 17 is a drawing showing the light-transmitting layer and the molding part of a light-emitting device according to the 6th embodiment of the present invention arranged spaced apart from each other.

[0062] FIG. 18 is an example of the spectrum of light generated in a light-emitting device according to the 6th embodiment.

[0063] FIG. 19 is a graph showing the light spectrum of a light-emitting device according to one embodiment of the present invention multiplied by a light spectrum risk function.

[0064] FIG. 20 is a schematic diagram for explaining a display device equipped with a light-emitting device according to one embodiment of the present invention.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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, variations 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.

[0073] 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.

[0074] 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.

[0075] Hereinafter, the specific configuration of the light-emitting device (1) according to the first embodiment of the present invention will be described with reference to the drawings.

[0076] Referring to FIGS. 1 and 2, a light-emitting device (1) according to the first embodiment of the present invention can irradiate light by receiving power from an external source. The light-emitting device (1) can be applied to a light-emitting device such as a display. Such a light-emitting device (1) may include a substrate (100), a light-emitting element (200), an absorption filler (300), and a wavelength converter (400).

[0077] The substrate (100) may support one or more of a light-emitting element (200) and a wavelength converter (400). For example, the substrate (100) may be a printed circuit board (PCB). Additionally, the substrate (100) may include an alloy composed of one or more of Cu, Zn, Au, Ni, Al, Mg, Cd, Be, W, Mo, Si, Ag, or Fe, or some of these. However, this is merely an example, and the substrate (100) may include one or more insulating materials such as ceramic series such as FR1, CEM-1, FR-4, Al2O3, or AlN, PMMA (polymethyl methacrylate) series, PE (polyethylene) series, or PS (polystyrene) series. Here, FR1 is a material in which copper foil and laminate paper are laminated, and CEM-1 is a material in which copper foil, glass fiber fabric, laminate paper, and glass fiber fabric are sequentially laminated. Additionally, FR-4 is a material in which copper foil and glass fiber fabric or glass fiber fabric are laminated. Additionally, the substrate (100) may include a base (110) and a sidewall (120).

[0078] The base (110) can support the light-emitting element (200). In other words, the base (110) and the light-emitting element (200) can be electrically connected. Additionally, a wavelength converter (400) can be placed in at least one area of ​​the base (110).

[0079] The side wall (120) extends upward from the base (110) at the edge of the base (110) and can provide a receiving space for accommodating a light-emitting element (200) inside. The side wall (120) can be extended to surround at least a portion of the light-emitting element (200). The height of the side wall (120) can be formed to be greater than the height of the light-emitting element (200). The side wall (120) can reflect light generated from the light-emitting element (200).

[0080] The light-emitting element (200) can generate light. For example, the light-emitting element (200) may be a device that converts electrical energy into light, such as a light-emitting diode, a laser diode, or an organic light-emitting diode. In this case, the light-emitting element (200) can generate light in the ultraviolet region, blue region, green region, yellow region, red region, infrared region, etc. The light-emitting element (200) is electrically connected to the electrical circuit of the substrate (100) and can generate light by receiving electricity from the outside through the electrical circuit. Such a light-emitting element (200) may be composed of a flip chip, a lateral chip, or a vertical chip.

[0081] The light-absorbing filler (300) may be a particle or pellet for absorbing a portion of the light generated from the light-emitting element (200). The light-absorbing filler (300) may be placed in the wavelength converter (400). For example, the light-absorbing filler (300) may absorb light in a specific range, such as UV light in the short wavelength range, light in the short wavelength blue range, and infrared light in the long wavelength range, but is not limited thereto. In other words, referring to FIG. 19 which will be described later, the light-absorbing filler (300) may absorb light such that when a calculated spectrum is calculated based on the spectrum of light generated from the light-emitting element (200) and a preset setting function, the area of ​​a predetermined reference wavelength range in the calculated spectrum is formed to be less than or equal to a threshold value relative to the area of ​​the entire wavelength range in the calculated spectrum. For example, the threshold value may be 10 to 15%. The wavelength of the peak of the setting function can be formed to be larger than the wavelength of the peak of the light spectrum generated from the light-emitting element (200). The reference wavelength band has a lower limit value smaller than the peak wavelength of the output spectrum and can have an upper limit value larger than the peak wavelength of the output spectrum.

[0082] The area of ​​the entire wavelength band can be calculated based on the following mathematical formula 1.

[0083]

[0084] In mathematical equation 1, λ is the wavelength. Φ λ is the spectrum of light emitted from the light-emitting element (200), and B(λ) is a setting function that is a light spectrum risk function. Also, a is the smallest first wavelength in the entire wavelength range, b is the largest second wavelength in the entire wavelength range, and λ is the wavelength. For example, such a first wavelength may be 380 nm and a second wavelength may be 780 nm. In other words, the entire wavelength range of the output spectrum may be from 380 to 780 nm, but is not limited thereto.

[0085] The data obtained by sampling B(λ) at 10nm intervals is as shown in Table 1 below.

[0086] WL(nm)B(λ)3801%3903%40010%41040%42090%43098%440100%45094%46080%47062%48045%49022%50010%5106%5204%5303%5402%5501%5601%

[0087] The area of ​​the reference wavelength band from reference wavelength c to reference wavelength d can be calculated based on the following mathematical formula 2.

[0088]

[0089] In mathematical equation 2, λ is the wavelength. Φ λ λ is the spectrum of light emitted from the light-emitting element (200), B(λ) is a light spectrum risk function, c is a first reference wavelength, and d is a second reference wavelength and may be a wavelength between the first wavelength and the second wavelength. c may be the starting point of the spectrum of light emitted from the light-emitting element (200). d may be the end point of the spectrum of light emitted from the light-emitting element (200) and may be a wavelength smaller than the second wavelength in the entire spectrum. c and d are wavelengths having a luminous intensity of less than 2% relative to the luminous intensity of the peak wavelength of light emitted from the light-emitting element (200), where c is a value in the short wavelength region relative to the peak wavelength of light emitted from the light-emitting element (200) and d is a value in the long wavelength region relative to the peak wavelength. This first reference wavelength may be 380 nm and may be the same as the first wavelength. The second reference wavelength may be 430 nm. In other words, the reference wavelength range of the output spectrum may be 380 to 430 nm, but is not limited thereto. B(λ) may be an ocular stability function for the blue light region, but is not limited thereto. Or B(λ) may be a visual perception function for the target wavelength region.

[0090] In addition, the area of ​​the reference wavelength band and the area of ​​the entire wavelength band in the calculated spectrum can satisfy the following mathematical equation 3.

[0091]

[0092] In mathematical formula 3, y is the ratio of the area of ​​the reference wavelength band to the area of ​​the total wavelength band. In other words, the area of ​​the reference wavelength band may be less than 10% of the area of ​​the total wavelength band. More preferably, the area of ​​the reference wavelength band may be less than 5% of the total wavelength band. This y may be the blue light risk.

[0093] Since such a light-absorbing filler (300) can absorb light of a reference wavelength range, it can increase safety regarding light generated from a light-emitting element (200). In other words, the light-absorbing filler (300) can absorb light of a wavelength range that may be harmful to the user's body. In addition, the light-absorbing filler (300) can implement a light-emitting device (1) with improved safety that satisfies Equation 3. The light-absorbing filler (300) can reduce the amount of light harmful to the human body by absorbing light of a reference wavelength range. The light-absorbing filler (300) can absorb light of a reference wavelength range and convert it to a different wavelength range. The light-absorbing filler (300) may include pigments containing cobalt oxide, benzimidazolone-based pigments, carbazole dioxazine-based pigments, as well as fillers containing oxides such as Fe₂O₃, TiO₂, ZnO, Nd₂O₃, yellow / amber / red dyes, Quantum Dot, nanophosphor, etc.

[0094] The wavelength converter (400) can be placed in the receiving space of the side wall (120) to cover the light-emitting element (200) and can improve the light extraction efficiency of the light-emitting element (200). Additionally, the wavelength converter (400) can encapsulate the light-emitting element (200) and refract light emitted from the light-emitting element (200). Additionally, the wavelength converter (400) may be a light-transmitting transparent molding for transmitting light emitted from the light-emitting element (200). For example, the wavelength converter (400) may be formed from a resin containing one or more of a silicone-based or epoxy-based resin, or may be formed from an inorganic material such as a glass-based or ceramic-based material. Additionally, the wavelength converter (400) may be formed from a fluorine resin to improve the light efficiency emitted from a plurality of light-emitting elements (200).

[0095] Such a wavelength converter (400) may include a wavelength conversion material capable of converting the wavelength of light emitted from a light-emitting element (200). For example, the wavelength conversion material may include a fluorescent material capable of emitting one or more of red light, blue light, or green light.

[0096] Additionally, the wavelength converter (400) may include a light-diffusing material capable of diffusing light emitted from the light-emitting element (200). For example, the light-diffusing material may include one or more of TiO2, BaO, SiO2, MgO, and Y2O3 capable of scattering light.

[0097] Hereinafter, with reference to FIGS. 3 and FIGS. 4, a light-emitting device (1) of the second embodiment of the present invention will be described. In describing the second embodiment, there is a difference in that a light transmission layer (500) may be further included, and this difference will be explained mainly.

[0098] The light-transmitting layer (500) may be placed in at least one area of ​​the wavelength converter (400) so that light generated from the light-emitting element (200) is transmitted. The light-transmitting layer (500) may diffuse light. For example, the light-transmitting layer (500) may be stacked in at least one area of ​​the wavelength converter (400) or spaced apart from the wavelength converter (400) in one direction. If the light-transmitting layer (500) and the wavelength converter (400) are spaced apart, an air layer may be formed between the light-transmitting layer (500) and the wavelength converter (400) to reduce damage caused by heat and improve reliability, but is not limited thereto, and a separate transmission layer through which light can be transmitted between the light-transmitting layer (500) and the wavelength converter (400) may be further provided to adjust the light path. The light-transmitting layer (500) may be a light-transmitting transparent molding for transmitting light emitted from the light-emitting element (200), and, for example, may be formed from a resin containing one or more of silicone-based, epoxy-based, and fluorine resins. Additionally, the light-transmitting layer (500) may be formed from glass or ceramic to improve the light efficiency emitted from the light-emitting element (200). Furthermore, the light-transmitting layer (500) may have a convex or concave lens shape having a curved surface to control the light emission angle. In addition, the light-transmitting layer (500) may be manufactured in a flat shape so as not to obstruct the light path. It may also have a thickness lower than that of the sidewall (120) to minimize light absorption.

[0099] The light-absorbing filler (300) can be placed in a light-transmitting layer (500) and positioned in an area further away from the light-emitting element (200) than the wavelength converter (400). In other words, since light can pass through the light-transmitting layer (500) where the light-absorbing filler (300) is placed after passing through the wavelength converter (400), light loss can be reduced. The light-absorbing filler (300) can be placed in the light-transmitting layer (500) to absorb light of a wavelength range that may be harmful to the user's body. In other words, the light-absorbing filler (300) can enable the implementation of a light-emitting device (1) with improved stability satisfying Equation 3.

[0100] Hereinafter, a light-emitting device (1) according to a third embodiment of the present invention will be described with reference to FIGS. 5 and 6. In describing the third embodiment, there is a difference in that a molding part (600) may be further included, and this difference will be explained mainly.

[0101] The molding portion (600) can be placed in a receiving space to cover the light-emitting element (200) and can improve the light extraction efficiency of a plurality of light-emitting elements (200). Additionally, the molding portion (600) can encapsulate the light-emitting element (200) and refract light emitted from the light-emitting element (200). Furthermore, the molding portion (600) may be a light-transmitting transparent molding for transmitting light emitted from the light-emitting element (200), and, for example, may be formed from a resin containing one or more of silicone-based, epoxy-based, and fluorine resins. Additionally, the molding portion (600) may be formed from glass or ceramic to improve the light efficiency emitted from the light-emitting element (200).

[0102] The wavelength converter (400) may be positioned on the upper side of the side wall (120) and / or the molding part (600). Additionally, the light-absorbing filler (300) may be positioned on one or more of the wavelength converter (400) and the molding part (600). As shown in FIG. 5, the light-absorbing filler (300) may be positioned on the molding part (600) and positioned separately from the wavelength converter (400). Through this, the degradation of the phosphor may be reduced by the light-absorbing filler (300), and the phosphor conversion light extraction efficiency may be increased. When the light-absorbing filler (300) is positioned on the molding part (600), the wavelength converter (400) may be positioned in an area further separated from the light-emitting element (200) than the light-absorbing filler (300). The wavelength converter (400) may be positioned on the upper side of the light-absorbing filler (300). In addition, as shown in FIG. 6, an absorbing filler (300) may be placed inside the wavelength converter (400) and may be placed on the upper side of the side wall (120) and / or the molding part (600). Through this, the absorbing filler (300) can absorb light, thereby reducing the thermal stress applied to the molding part (600) and improving driving reliability.

[0103] The light-absorbing filler (300) is placed in one or more of the molding part (600) and the wavelength converter (400) to absorb light of a wavelength range that may be harmful to the user's body. In other words, the light-absorbing filler (300) can implement a light-emitting device (1) with improved stability that satisfies Equation 3.

[0104] Hereinafter, with reference to FIGS. 7 to 9, a light-emitting device (1) according to the fourth embodiment of the present invention will be described. In describing the fourth embodiment, there are differences in the arrangement relationship of the wavelength converter (400), the light-transmitting layer (500), and the molding part (600), so these differences will be explained mainly. Meanwhile, the light-absorbing filler (300) may be placed in one or more of the molding part (600) or the light-transmitting layer (500).

[0105] As a first example, referring to FIG. 7, a wavelength converter (400) may be placed in the upper region of the molding part (600), and a light-transmitting layer (500) may be placed in the upper region of the wavelength converter (400). Additionally, an absorbing filler (300) may be placed in the light-transmitting layer (500). By placing such an absorbing filler (300) in the light-transmitting layer (500), it may be placed in the upper region above the wavelength converter (400) and the molding part (600). At this time, light may be absorbed by the absorbing filler (300) after passing through the wavelength converter (400). Through this, light loss may be reduced, and phosphor conversion efficiency may be increased.

[0106] As a second example, referring to FIG. 8, a wavelength converter (400) is disposed in the upper region of the molding portion (600), and a light-transmitting layer (500) is disposed in the upper region of the wavelength converter (400), and the wavelength converter and the light-transmitting layer (500) may be disposed spaced apart in the vertical direction. An absorbing filler (300) may be disposed in the light-transmitting layer (500). In other words, the absorbing filler (300) may be disposed in the light-transmitting layer (500) and spaced apart from the wavelength converter (400). Because of this absorbing filler (300), light can be absorbed by the absorbing filler (300) after passing through the wavelength converter (400), light loss can be reduced, re-absorption can be prevented, and phosphor conversion efficiency can be increased.

[0107] As a third example, referring to FIG. 9, the wavelength converter (400) can cover the upper surface of the base (110) and the light-emitting element (200) so that the upper surface of the base (110) and the light-emitting element (200) are spaced apart from the molding part (600). The molding part (600) can be stacked in at least one area of ​​the wavelength converter (400) and placed in the receiving space. Additionally, the wavelength converter (400) can be placed in at least one area of ​​the side wall (120) and the molding part (600). The light-absorbing filler (300) can be placed in the light-transmitting layer (500). In other words, the light-absorbing filler (300) can be placed in at least one area of ​​the molding part (600) and spaced apart from the wavelength converter (400). With this light-absorbing filler (300), light can be absorbed by the light-absorbing filler (300) after passing through the wavelength converter (400), so light loss can be reduced, re-absorption can be prevented, and phosphor conversion efficiency can be increased.

[0108] The light-absorbing filler (300) is placed in the light-transmitting layer (500) and can absorb light of a specific wavelength band, for example, light of a wavelength band that may be harmful to the user's body. In other words, the light-absorbing filler (300) can implement a light-emitting device (1) with improved stability that satisfies Equation 3.

[0109] Meanwhile, FIG. 10 is a diagram showing an example of the light spectrum of the light-emitting device (1) of the second to fourth embodiments of the present invention.

[0110] In FIG. 10, LS1 is the spectrum of light from a conventional light-emitting device (1) without an absorption filler (300). In FIG. 10, normalization is based on the highest peak value of the spectrum intensity. LS2 is the spectrum of light generated from a light-emitting device (1) containing a wavelength converter (400) containing a yellow or green phosphor and an absorption filler (300). LS3 is the spectrum of light generated from a light-emitting device (1) containing a wavelength converter (400) containing yellow, or green phosphor and red phosphor (KSF) and an absorption filler (300). B(λ) is an eye safety function (light spectrum risk function) for the blue light region. In LS2 and LS3, light in the 430 nm band is absorbed and reduced by the absorption filler (300), so the rate of change to the left of the peak relative to the blue light peak may be formed to be greater than that of LS1. LS3 may have multiple peaks in the red region. That is, while the blue light risk of conventional light-emitting devices is 10% or more, LS2 is less than 7% and LS3 can be less than 2%.

[0111] Hereinafter, a light-emitting device (1) according to the fifth embodiment of the present invention will be described with reference to FIGS. 11 to 13. In describing the fifth embodiment, there is a difference in that the light-emitting element (200) can be formed in multiple numbers, and this difference will be explained mainly.

[0112] A plurality of light-emitting elements (200) may include a first light-emitting element (210) and a second light-emitting element (220). The first light-emitting element (210) and the second light-emitting element (220) may have different wavelengths. For example, the first light-emitting element (210) may emit blue light. The second light-emitting element (220) may emit green light. Additionally, the wavelength converter (400) may include a phosphor that emits red light.

[0113] In the first example, the wavelength converter (400) may be placed in a receiving space to cover at least one of the first light-emitting element (210) or the second light-emitting element (220). Additionally, since the light-absorbing filler (300) may be placed in the wavelength converter (400), the color depth in the display can be increased. At this time, the light-absorbing filler (300) may have a high absorption rate for light of a shorter wavelength region among the light generated from the first light-emitting element (210) or the second light-emitting element (220). For example, when the first light-emitting element (210) emits blue light and the second light-emitting element (220) emits green light, if the wavelength converter (400) is removed and the difference between the chip's inherent spectrum and the light-emitting device's spectrum is compared, the difference in the spectrum of the first light-emitting element (210) may be greater than the difference in the spectrum of the second light-emitting element. At this time, the spectrum change range of the second light-emitting element (220) may be 10% or more and less than 50% compared to the change range of the first light-emitting element (210). Through this, light efficiency can be effectively increased while reducing the amount of light emitted that is harmful to the user.

[0114] As a second example, the wavelength converter (400) may be placed in a receiving space to cover the first light-emitting element (210) and the second light-emitting element (220). The light-transmitting layer (500) may be placed in an upper region of the wavelength converter (400) or spaced apart from the wavelength converter (400). Additionally, the light-absorbing filler (300) may be placed in the light-transmitting layer (500). A portion of the light generated from the first light-emitting element (210) and the second light-emitting element (220) may pass through the wavelength converter (400) and be converted into a long wavelength, and then pass through the light-transmitting layer (500) on which the light-absorbing filler (300) is placed. If the wavelength converter (400) and the light absorption filler (300) are arranged separately, some of the light remaining after some of the light is converted in the wavelength converter (400) is absorbed by the light absorption filler (300), thereby improving the conversion efficiency of the wavelength converter (400) and increasing the light efficiency.

[0115] The light-absorbing filler (300) is placed in one or more of the wavelength converter (400) and the light-transmitting layer (500) to absorb light of a specific wavelength range among the light of a plurality of light-emitting elements (200). In other words, the light-absorbing filler (300) can implement a light-emitting device (1) with improved stability satisfying Equation 3. Meanwhile, FIG. 14 is a diagram showing an example of the spectrum of light generated in the light-emitting device (1) of the fifth embodiment of the present invention.

[0116] In FIG. 14, LS4 may be the spectrum of light generated from a light-emitting device (1) comprising a first light-emitting element (210) that generates blue light, a second light-emitting element (220) that generates green light, a wavelength converter (400) containing a red phosphor (KSF), and an absorption filler (300). In LS4, the peak of blue light may be the highest, and the peak of green light may be smaller than the peak of red light. In LS4, there may be one or multiple peaks of red light. In LS4, the area by wavelength may be widest for blue light. Due to short-wavelength absorption by the absorption filler (300), the area of ​​blue light may be narrower to the left of the peak than to the right. The area to the right may be 10% to 20% larger than the area to the left. Light in the short-wavelength region with low stability can be designed to be small to improve light stability while maintaining light intensity. Additionally, the rate of change of the blue light peak among the green light and blue light peaks can be formed more significantly by the light-absorbing filler (300). When comparing the light spectrum before and after removing the light-transmitting layer (500) on which the light-absorbing filler (300) is placed, the rate of change of the blue light spectrum may be higher. At this time, the rate of change of the peak intensity of the blue light region may be 5% to 20%, and the peak intensity of the green light may be less than 5%, which is lower than this. Through this, a light-emitting device (1) with improved stability satisfying Equation 3 can be realized while reducing the decrease in luminous flux. The half-width of the blue light may be narrower than that of the green light. At this time, the difference in half-width between the blue light and the green light may be 10 nm or more and less than 15 nm. Through this, a light-emitting device (1) with improved stability satisfying Equation 3 can be realized while reducing the decrease in luminous flux. The red light can be formed with the narrowest half-width by the wavelength converter (400). The blue light risk of such a light-emitting device (1) can be less than 5%. Through this, a light-emitting device (1) with improved stability satisfying Equation 3 can be implemented. In addition, the light-absorbing filler (300) can absorb a portion of the light in the long wavelength region of the spectrum in the green wavelength region.For example, it can absorb some of the light with wavelengths between 570 nm and 590 nm in the green peak wavelength region.

[0117] Hereinafter, a light-emitting device (1) according to the sixth embodiment of the present invention will be described with reference to FIGS. 15 to 17. In describing the fifth embodiment, a plurality of light-emitting elements (200) may include a first light-emitting element (210), a second light-emitting element (220), and a third light-emitting element (230), and at least one of the first light-emitting element (210), the second light-emitting element (220), and the third light-emitting element (230) may emit light of a different wavelength band. For example, there is a difference in that the third light-emitting element (230) generates red light, and this difference will be explained mainly.

[0118] In the first example, the first light-emitting element (210), the second light-emitting element (220), and the third light-emitting element (230) can be covered by the molding part (600). The light-absorbing filler (300) can be placed in the molding part (600). Additionally, since the wavelength converter (400) may not be provided, the process can be simplified, there is no degradation of the phosphor, and a display with clearer colors can be provided.

[0119] Referring to FIG. 13, in a second example, the first light-emitting element (210), the second light-emitting element (220), and the third light-emitting element (230) can be covered by a molding part (600). The light-transmitting layer (500) can be placed in the upper region of the molding part (600) or spaced upward from the molding part (600). The light-absorbing filler (300) can be placed in the light-transmitting layer (500). Additionally, since the wavelength converter (400) may not be provided, there is no degradation of the phosphor, and a display with a clearer color can be provided.

[0120] The light-absorbing filler (300) is placed in one or more of the wavelength converter (400) and the light-transmitting layer (500) to absorb light of a specific wavelength range among the light of a plurality of light-emitting elements (200). In other words, the light-absorbing filler (300) can implement a light-emitting device (1) with improved stability that satisfies Equation 3.

[0121] Meanwhile, FIG. 18 is an example of the spectrum of light generated from a light-emitting device (1) according to the 6th embodiment. In FIG. 18, normalization is based on the highest peak value of the spectrum intensity.

[0122] In FIG. 18, LS5 may be the spectrum of light of a light-emitting device (1) comprising a first light-emitting element (210) that generates blue light, a second light-emitting element (220) that generates green light, a third light-emitting element that generates red light, and an absorption filler (300). In LS5, peaks may be clearly formed in each region. In LS5, there may be three or more peaks. In LS5, the full width at half maximum may be narrowest for blue light due to the absorption filler (300). For example, the full width at half maximum of a wavelength having a peak in the blue light region of 430 nm to 500 nm may be 15 nm to 20 nm. Also, the full width at half maximum of a wavelength having a peak in the green light region of 500 nm to 580 nm may be 20 nm to 30 nm. In addition, the full width at half maximum of the wavelength having a peak in the red light region of 580 nm to 680 nm may be 20 nm to 30 nm. Also, based on the peak in the blue light region of LS5, the rate of change to the left of LS5 may be greater than the rate of change to the right of LS5. In other words, the rate of change to the left of the blue light peak in LS5 may be formed most significantly. Through this, a light-emitting device (1) with improved stability satisfying Equation 3 can be realized. Also, based on the peak in the blue light region, the left side may be narrower than the right side. The right area may be 10% to 20% larger than the left area. By designing the short-wavelength region light with low stability to be small, light stability can be improved while maintaining the amount of light. Although the peak of blue light may be formed most highly in LS5, by making the area on the short-wavelength side narrower than the area on the long-wavelength region, a light-emitting device (1) with improved stability satisfying Equation 3 can be realized while maintaining the amount of light. In addition, the peak of the red light may be higher than or equal to the peak of the green light. The blue light risk of the light-emitting device (1) may be 3% or less.

[0123] FIG. 19 is a graph showing the light spectrum of a light-emitting device (1) according to one embodiment of the present invention multiplied by a light spectrum risk function. Normalization is based on the highest peak value of the spectrum intensity. In other words, it is a graph showing the light spectrum risk function multiplied by each of the previously described LS1, LS2, LS3, LS4, and LS5. In other words, FIG. 19 is a graph showing the total area derived by Equation 1. In addition, the area in the dotted line region (S) in FIG. 19 is an area calculated by Equation 2, which is 10% or less of the total area.

[0124] FIG. 20 is a schematic diagram for explaining a display device (2) equipped with a light-emitting device (1) according to one embodiment of the present invention.

[0125] Referring to FIG. 20, the display device (2) includes a main body (2a) and a surface light source (2b) mounted on the main body (2a). The main body (2a) may include a high-density material with high thermal conductivity, which can improve the reliability of the display device (2). A plurality of light-emitting devices (1) may be mounted on a substrate (2c) containing electrical wiring of the surface light source (2b), and each light-emitting device (1) may be individually driven for each region to control brightness or control the light-emitting region. Additionally, an optical sheet (2d) containing at least one of a diffusion sheet, a polarizing sheet, or a color conversion sheet that diffuses light may be placed on the upper surface of the surface light source (2b). The display device (2) according to the present embodiment can have a distinct contrast ratio by reducing light interference between the plurality of light-emitting devices (1) and minimizing interference between driving regions. Furthermore, the display device (2) can realize a high-quality display device with distinct contrast. In addition, when the light-emitting device (1) is applied to the display device (2), a display device (2) with improved high color reproduction rate and photobiological stability can be realized. Through the light-absorbing filler (300), light of a specific wavelength band, for example, light of a wavelength band that may be harmful to the user's body, can be absorbed. In other words, the light-absorbing filler (300) can realize a light-emitting device (1) with improved stability that satisfies Equation 3.

[0126] 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. Substrate; A light-emitting element disposed on the above substrate and generating light; and When a calculated spectrum is calculated based on the spectrum of light generated from the light-emitting element and a preset setting function, the apparatus includes an absorption filler configured to absorb the light such that the area of ​​a predetermined reference wavelength band in the calculated spectrum is formed to be less than or equal to a threshold value relative to the area of ​​the entire wavelength band in the calculated spectrum. The above-mentioned predetermined reference wavelength band has a lower limit value smaller than the peak wavelength of the above-mentioned calculated spectrum and an upper limit value larger than the peak wavelength of the above-mentioned calculated spectrum, Light-emitting device.

2. In Paragraph 1, The above threshold is 10 to 15%, Light-emitting device.

3. In Paragraph 1, The area of ​​the entire wavelength band above is calculated based on the following mathematical formula 1, and [Mathematical Formula 1] In mathematical equation 1, λ is the wavelength, and Φ λ is the spectrum of light emitted from the light-emitting element (200), B(λ) is the light spectrum risk function which is the setting function, a is the smallest first wavelength in the entire wavelength range, and b is the largest second wavelength in the entire wavelength range, Light-emitting device.

4. In Paragraph 3, The area of ​​the above reference wavelength band is calculated based on the following mathematical formula 2, and [Mathematical Formula 2] In the above mathematical formula 2, λ is the wavelength, and Φ λ is the spectrum of light emitted from a light-emitting element, B(λ) is the light spectrum risk function, c is the first reference wavelength, and d is the second reference wavelength, Light-emitting device.

5. In Paragraph 4, The area of ​​the reference wavelength band and the area of ​​the entire wavelength band satisfy the following mathematical formula 3, and [Mathematical Formula 3] y is the ratio of the area of ​​the reference wavelength band to the area of ​​the total wavelength band, Light-emitting device.

6. In Paragraph 5, The first wavelength is 380 nm and the second wavelength is 780 nm, Light-emitting device.

7. In Paragraph 5, The above second reference wavelength is 430 nm, Light-emitting device.

8. In Paragraph 1, The wavelength of the peak of the above setting function is greater than the wavelength of the peak of the spectrum of light generated from the light-emitting element. Light-emitting device.

9. In Paragraph 1, A wavelength converter that covers the light-emitting element and is disposed on the substrate; and A light-transmitting layer disposed in at least one region of the wavelength converter, Light-emitting device.

10. In Paragraph 9, The above light-absorbing filler is, disposed in one or more of the above wavelength converter and the above light-transmitting layer, Light-emitting device.

11. In Paragraph 9, The wavelength converter and the light-transmitting layer are spaced apart in the vertical direction. Light-emitting device.

12. In Paragraph 9, The above light-emitting element is formed in multiple numbers, and The above plurality of light-emitting elements are, A first light-emitting element configured to generate blue light; and A second light-emitting element configured to generate green light, Light-emitting device.

13. Base mill A substrate comprising a side wall extending upward from the edge of the base; A light-emitting element disposed on the above substrate and generating light; and A molding part for covering the light-emitting element; and A wavelength converter disposed in at least one region of the molding portion and at least one region of the side wall to convert the wavelength of light; and A light-absorbing filler disposed in the molding part and the wavelength converter to absorb a portion of the light, Light-emitting device.

14. In Paragraph 13, The above light-emitting element is formed in multiple numbers, and The above plurality of light-emitting elements are, A first light-emitting element configured to generate blue light; A second light-emitting element configured to generate green light; and A third light-emitting element configured to generate red light, Light-emitting device.

15. Base mill A substrate comprising a side wall extending upward from the edge of the base; A light-emitting element disposed on the above substrate and generating light; A molding part for covering the light-emitting element; and A light-transmitting layer disposed in at least one region of the above-mentioned molding portion and through which light is transmitted; and A light-absorbing filler disposed in the light-transmitting layer to absorb a portion of the light, Light-emitting device.

16. In Paragraph 15, The above molding part and the above light-transmitting layer are spaced apart in the vertical direction. Light-emitting device.

17. In Paragraph 16, A wavelength converter further comprising a wavelength converter disposed on the molding part and the side wall to convert the wavelength of light, positioned between the molding part and the light-transmitting layer. Light-emitting device.

18. In Paragraph 17, The light-transmitting layer and the wavelength converter are spaced apart in the vertical direction. Light-emitting device.

19. In Paragraph 16, A wavelength converter further comprising covering the upper surface of the base and the light-emitting element so that the upper surface of the base and the light-emitting element are spaced apart from the molding portion, Light-emitting device.

20. In Paragraph 16, The above light-emitting element is formed in multiple numbers, and The above plurality of light-emitting elements are, A first light-emitting element configured to generate blue light; A second light-emitting element configured to generate green light; and A third light-emitting element configured to generate red light, Light-emitting device.

Images