Light-emitting device

Abstract

According to one aspect of the present invention, a light-emitting device can be provided, the device comprising a plurality of light-emitting elements for generating light within a predetermined color temperature range on a color coordinate system, wherein the average of the color coordinate values in the plurality of light-emitting elements is located within the predetermined color temperature range, and the plurality of light-emitting elements include first light-emitting elements and second light-emitting elements that satisfy mathematical formula 1, and, in formula 1, a is a wavelength selected within a range of 200 nm to less than 500 nm, b is a wavelength selected within a range of 500 nm to less than 900 nm, LC(xk) is a normalized radiant flux spectrum in the light emitted from the plurality of light-emitting elements, and refc(xk) is a normalized radiant flux spectrum of natural light normalized in a natural light spectrum.

Description

Light-emitting device

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

[0002] Lighting devices installed indoors are manufactured in various shapes and forms, and their composition consists of a main body that is fixed to a ceiling or wall, equipped with a light source that emits light and various related parts on the inside, and a light-transmitting cover that is manufactured to maintain the illuminance while also forming an attractive appearance.

[0003] Meanwhile, demand is increasing for technology that can produce white light similar to natural light using light-emitting devices.

[0004] Embodiments of the present invention seek to provide a light-emitting device that generates light similar to natural light.

[0005] Embodiments of the present invention aim to provide a light emitting device having vivid color reproducibility.

[0006] Embodiments of the present invention aim to provide a highly reliable light-emitting device by protecting a light-emitting element from an external environment.

[0007] Embodiments of the present invention can implement a high-quality light-emitting device with low chromatic aberration.

[0008] According to one aspect of the present invention, a light-emitting device comprises a plurality of light-emitting elements that generate light within a predetermined color temperature region on a color coordinate system, wherein an average of color coordinate values ​​of the plurality of light-emitting elements is located within the predetermined color temperature region, and the plurality of light-emitting elements include a first light-emitting element and a second light-emitting element that satisfy the following mathematical expression 1:

[0009] [Mathematical Formula 1]

[0010]

[0011] In the above mathematical expression 1, a is a wavelength selected within a range of 200 nm to less than 500 nm, b is a wavelength selected within a range of 500 nm to less than 900 nm, and LC (x k ) is the normalized radiant spectrum of light emitted from the plurality of light-emitting elements, and the ref c (x k ) can be provided with a light-emitting device having a normalized radiant spectrum of natural light normalized to the natural light spectrum. The color coordinate system can be the CIE 1931 color space.

[0012] In addition, a light emitting device may be provided in which the color temperature region has vertices of a first coordinate, a second coordinate, a third coordinate, and a fourth coordinate on the color coordinate system, the first coordinate has an x ​​value that is smaller than the x values ​​of the second coordinate and the third coordinate, and a y value that is smaller than the y values ​​of the second coordinate, the third coordinate, and the fourth coordinate, the second coordinate has a y value that is smaller than the y values ​​of the third coordinate and the fourth coordinate, the third coordinate has a y value that is larger than the y values ​​of the first coordinate, the second coordinate, and the fourth coordinate, and an x ​​value that is larger than the x values ​​of the first coordinate and the fourth coordinate, and the fourth coordinate has a y value that is larger than the y values ​​of the first coordinate and the second coordinate and smaller than the y value of the third coordinate, and an x ​​value that is smaller than the x values ​​of the second coordinate and the third coordinate.

[0013] In addition, a light emitting device may be provided in which the color temperature region has an elliptical shape on the color coordinate system.

[0014] In addition, the above color temperature region may be provided with a light emitting device that is tilted at a predetermined angle with respect to the x-axis on the color coordinate system.

[0015] In addition, a light emitting device may be provided in which the predetermined angle is 40° or more and 70° or less.

[0016] In addition, a light emitting device can be provided in which the length of the major axis of the color temperature region is 0.0110 or more and 0.0144 or less.

[0017] In addition, a light emitting device can be provided in which the length of the short axis of the color temperature region is 0.0045 or more and 0.0066 or less.

[0018] In addition, a light emitting device can be provided in which the color temperature of light of the plurality of light emitting elements is 1700K to 7000K.

[0019] In addition, it includes a plurality of first light-emitting elements that generate light within a first color temperature region among a plurality of color temperature regions on a color coordinate system; a plurality of second light-emitting elements that generate light within a second color temperature region different from the first color temperature region among a plurality of color temperature regions on a color coordinate system; and a controller that controls the intensity of light of the plurality of light-emitting elements so that an average of color coordinate values ​​of the plurality of first light-emitting elements and the plurality of second light-emitting elements is located within one of the plurality of color temperature regions, and the controller controls the plurality of first light-emitting elements and the plurality of second light-emitting elements so that the following mathematical expression 1 is satisfied:

[0020] [Mathematical Formula 1]

[0021]

[0022] In the above mathematical expression 1, a is a wavelength selected within a range of 200 nm to less than 500 nm, b is a wavelength selected within a range of 500 nm to less than 900 nm, and L C (x k ) is the normalized radiant spectrum of light emitted from the plurality of light-emitting elements, and the ref c (x k ) is a normalized radiant spectrum of natural light normalized to the natural light spectrum, a light emitting device can be provided.

[0023] In addition, a light-emitting device may be provided in which the first color temperature region has the largest color coordinate value of a center point among the plurality of color temperature regions, the second color temperature region has the smallest color coordinate value of a center point among the plurality of color temperature regions, and the controller controls the light intensity of the plurality of first light-emitting elements and the light intensity of the plurality of second light-emitting elements so that an average of the color coordinate values ​​of the plurality of light-emitting elements moves from one of the first color temperature region and the second color temperature region toward the other of the first color temperature region and the second color temperature region.

[0024] In addition, a light-emitting device may be provided in which the controller increases the light intensity of the plurality of first light-emitting elements and decreases the light intensity of the plurality of second light-emitting elements so that the average of the color coordinate values ​​of the plurality of light-emitting elements moves toward the first color temperature region.

[0025] In addition, a light-emitting device may be provided in which the controller reduces the light intensity of the plurality of first light-emitting elements and reduces the light intensity of the plurality of second light-emitting elements so that the average of the color coordinate values ​​of the plurality of light-emitting elements moves toward the second color temperature region.

[0026] In addition, the controller may be provided with a light-emitting device that forms the light intensity of the plurality of first light-emitting elements and the light intensity of the plurality of second light-emitting elements to be the same so that the average of the color coordinate values ​​of the plurality of light-emitting elements is arranged in one of the plurality of color temperature regions, and is arranged at the center of the first color temperature region and the second color temperature region.

[0027] In addition, a light emitting device may be provided in which the plurality of color temperature regions have a rectangular shape on the color coordinate system and are arranged so that at least some of them are in contact with each other.

[0028] Additionally, a light emitting device may be provided in which the size of the first color temperature region is larger than the size of the second color temperature region.

[0029] In addition, a light emitting device may be provided in which the plurality of color temperature regions have an elliptical shape on the color coordinate system and are spaced apart from each other.

[0030] In addition, a light emitting device may be provided in which the plurality of color temperature regions are arranged to be inclined at a predetermined angle with respect to the x-axis of the color coordinate system.

[0031] Additionally, a light emitting device may be provided in which the angle at which the first color temperature region is tilted is different from the angle at which the second color temperature region is tilted.

[0032] According to one aspect of the present invention, there is provided a light emitting device that generates light; and a controller that controls the light emitting device so that Srms of the following mathematical expression 1 satisfies a range of 0.001 or more and 0.9 or less,

[0033] [Mathematical Formula 1]

[0034]

[0035] In the above mathematical expression 1, a is a wavelength selected within a range of 200 nm to less than 500 nm, b is a wavelength selected within a range of 500 nm to less than 900 nm, and L C (x k ) is the normalized radiant spectrum of the light emitted from the above light emitter, and the ref c (x k ) is a normalized radiant spectrum of natural light normalized to the natural light spectrum, a light emitting device can be provided.

[0036] In addition, the light emitting device may include a first light emitting element that generates light within a first color temperature region among a plurality of color temperature regions on a color coordinate system; and a second light emitting element that generates light within a second color temperature region different from the first color temperature region among a plurality of color temperature regions on a color coordinate system, and a light emitting device may be provided in which light intensity data for controlling the light intensity of the first light emitting element and the light intensity of the second light emitting element are stored in advance in the controller.

[0037] Embodiments of the present invention seek to provide a light-emitting device that generates light similar to natural light.

[0038] Embodiments of the present invention aim to provide a light emitting device having vivid color reproducibility.

[0039] Embodiments of the present invention aim to provide a highly reliable light-emitting device by protecting a light-emitting element from an external environment.

[0040] Embodiments of the present invention can implement a high-quality light-emitting device with low chromatic aberration.

[0041] Figure 1 is an exploded perspective view of a light emitting device according to a first embodiment of the present invention.

[0042] Fig. 2 is a drawing showing a light emitting device of the light emitting device of Fig. 2.

[0043] Fig. 3 is a plan view of the light emitting device of Fig. 3.

[0044] FIG. 4 is a drawing showing a first example of a plurality of color temperature regions in which the average of the color coordinate values ​​of a plurality of first light-emitting elements and a plurality of second light-emitting elements of the light-emitting device of FIG. 2 can be located.

[0045] FIG. 5 is a drawing showing a second example of a plurality of color temperature regions in which the average of the color coordinate values ​​of a plurality of first light-emitting elements and a plurality of second light-emitting elements of the light-emitting device of FIG. 2 can be located.

[0046] FIG. 6 is a drawing showing a third example of a plurality of color temperature regions in which the average of the color coordinate values ​​of a plurality of first light-emitting elements and a plurality of second light-emitting elements of the light-emitting device of FIG. 2 can be located.

[0047] Figure 7 is a drawing comparing the sizes of color temperature areas.

[0048] FIG. 8 is a diagram showing the natural light similarity when a light emitting device or light emitting apparatus according to the second embodiment of the present invention generates light with a correlated color temperature of 6500 K and 2700 K.

[0049] Figure 9 is a diagram showing the relative luminous flux by wavelength of natural light at a correlated color temperature of 6500K.

[0050] Figure 10 is a diagram showing the relative luminous flux by wavelength of natural light at a correlated color temperature of 5000K.

[0051] Figure 11 is a diagram showing the relative luminous flux by wavelength of natural light at a correlated color temperature of 4000K.

[0052] Figure 12 is a diagram showing the relative luminous flux by wavelength of natural light at a correlated color temperature of 3000K.

[0053] Figure 13 is a diagram showing the relative luminous flux by wavelength of natural light at a correlated color temperature of 2700K.

[0054] FIG. 14 is an example of a color coordinate shift for mixed light of a first light emitting element and a second light emitting element when the first light emitting element of the light emitting device of the present invention has a lower color temperature than the second light emitting element.

[0055] Fig. 15 is an example of the natural light similarity of the first light emitting element having a high color temperature and the second light emitting element having a low color temperature of the light emitting device of the present invention and the two mixed lights.

[0056] Figure 16 is a graph showing the light intensity of the first light-emitting element and the second light-emitting element in color temperature correlation information.

[0057] In the following description, for purposes of explanation, numerous specific details are set forth to provide a thorough understanding of various embodiments or implementations of the present disclosure. As used herein, the terms "embodiment" and "implementation" are interchangeable to refer to non-limiting examples of devices or methods that utilize one or more of the inventive concepts disclosed herein. However, it will be apparent that various embodiments may be practiced without utilizing these specific details or using one or more equivalent arrangements. In other instances, well-known structures and devices are shown in block diagram form to avoid unnecessarily obscuring the various embodiments. Furthermore, while the various embodiments may vary from one another, they are not necessarily exclusive. For example, specific features, configurations, and characteristics of an embodiment may be utilized or implemented in other embodiments without departing from the scope of the inventive concepts.

[0058] Unless otherwise specified, the illustrated embodiments should be understood to provide exemplary features of varying details of some ways in which the concepts of the present invention may be practically implemented. Therefore, unless otherwise specified, the features, components, modules, layers, membranes, panels, regions, and / or aspects (hereinafter, individually or collectively referred to as "elements") of the various embodiments may be differently combined, separated, interchanged, and / or rearranged without departing from the scope of the concepts of the present invention.

[0059] The use of cross-hatching and / or shading in the accompanying drawings is generally provided to clarify boundaries between adjacent elements. As such, the presence or absence of cross-hatching or shading, unless expressly stated, does not imply or indicate any preference or requirement for any particular material, material properties, dimensions, proportions, commonality between the illustrated elements, and / or any other features, properties, or characteristics of the elements. Furthermore, in the accompanying drawings, the dimensions and relative sizes of elements may be exaggerated for clarity and / or illustrative purposes. When embodiments are implemented differently, certain process sequences may be performed differently from the illustrated sequence. For example, two consecutively illustrated processes may be performed substantially simultaneously or in a reverse order from the illustrated sequence. Furthermore, like reference numerals designate like elements.

[0060] When an element, such as a layer, is referred to as being "on," "connected to," or "joined to" another element or layer, the element may be directly on, connected to, or joined to the other element or layer, or there may be intervening elements or layers present. However, when an element or layer is referred to as being "directly on," "directly connected to," or "directly joined to" another element or layer, there are no intervening elements or layers present. For this purpose, the term "connected" may refer to physical, electrical, and / or fluidic connections, with or without intervening elements. Furthermore, the DR1-axis, DR2-axis, and DR3-axis are not limited to the three axes of a Cartesian coordinate system, such as the x, y, and z-axes, and may be interpreted in a broader sense. For example, the DR1-axis, DR2-axis, and DR3-axis may be perpendicular to one another, or may represent different directions that are not perpendicular to one another. For purposes of this disclosure, “at least one of X, Y, and Z” and “at least one selected from the group consisting of X, Y, and Z” may be interpreted as only X, only Y, only Z, or any combination of two or more of X, Y, and Z, such as, for example, XYZ, XYY, YZ, and ZZ. The term “and / or” as used herein includes any and all combinations of one or more of the associated listed items.

[0061] Although the terms "first," "second," and the like may be used herein to describe various types of elements, these elements should not be limited by these terms. These terms are used to distinguish one element from another. Therefore, the first element discussed below may be referred to as the second element without departing from the teachings of the present disclosure.

[0062] Spatially relative terms such as "beneath," "beneath," "directly beneath," "lower," "above," "upper," "above," "higher than," "side" (as in, for example, a "side wall"), and the like may be used for descriptive purposes and thereby to describe the relationship of one element to other element(s) as depicted in the drawings. Spatially relative terms are intended to encompass different orientations of the device in use, operation, and / or manufacture in addition to the orientations depicted in the drawings. For example, if the device in the drawings were turned over, an element described as "beneath" or "beneath" another element or feature would then be oriented "above" the other element or feature. Therefore, the exemplary term "beneath" can encompass both orientations above and below. Furthermore, the device can be oriented differently (e.g., rotated 90° or oriented in other orientations), and thus the spatially relative descriptors used herein can also be interpreted accordingly.

[0063] The terminology used herein is for the purpose of describing particular embodiments and is not limiting. The singular forms "a," "an," and "the" as used herein also include the plural forms unless the context clearly dictates otherwise. Furthermore, the terms "comprises," "comprising," "includes," and / or "comprising" as used herein specify the presence of stated features, integers, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. Furthermore, the terms "substantially," "about," and other similar terms as used herein are used as terms of approximation rather than degrees, and as such, are used to describe inherent deviations from measured, calculated, and / or provided values ​​that would be recognized by one of ordinary skill in the art.

[0064] Various embodiments are described below with reference to cross-sectional and / or exploded illustrations, which are schematic illustrations of idealized embodiments and / or intermediate structures. As such, variations from the shapes of the illustrated drawings may be expected, for example, as a result of manufacturing techniques and / or tolerances. Therefore, the embodiments disclosed herein should not necessarily be construed as limited to the shapes of specific illustrated regions, but should be construed to include, for example, deviations in shape resulting from manufacturing. In this way, the regions depicted in the drawings may be schematic in nature, and the shapes of these regions may not reflect the actual shapes of regions of the device, and as such, are not necessarily intended to have a limiting meaning.

[0065] As is conventional in the art, some embodiments may be illustrated and described in the accompanying drawings in terms of functional blocks, units, and / or modules. Those skilled in the art will appreciate that these blocks, units, and / or modules are physically implemented by electronic (or optical) circuits such as logic circuits, discrete components, microprocessors, wiring circuits, memory elements, and wiring connections formed using semiconductor-based or other manufacturing techniques. When the blocks, units, and / or modules are implemented by microprocessors or other similar hardware, they may be programmed and controlled using software (e.g., microcode) to perform the various functions discussed herein, and optionally, may be driven by firmware and / or software. Furthermore, each block, unit, and / or module may be implemented by dedicated hardware, or by a combination of dedicated hardware for performing some functions and processors (e.g., one or more programmed processors and associated circuitry) for performing other functions. Additionally, the blocks, units, and / or modules of some embodiments may be physically separated into two or more interacting and individual blocks, units, and / or modules without departing from the scope of the present invention. Additionally, the blocks, units, and / or modules of some embodiments may be physically combined into more complex blocks, units, and / or modules without departing from the scope of the present invention.

[0066] Unless otherwise defined, all terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. Terms defined in commonly used dictionaries, such as terms defined in commonly used dictionaries, should be interpreted to have a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealistic or overly formal sense unless explicitly defined herein.

[0067] Hereinafter, a light emitting device (1) according to a first embodiment of the present invention will be described with reference to the drawings.

[0068] Referring to FIGS. 1 to 3, a light-emitting device (1) according to a first embodiment of the present invention is a device capable of generating light. The light-emitting device (1) may be installed indoors, but is not limited thereto. The light-emitting device (1) may be controlled by a switch installed on a wall of an indoor space to generate light, or may be controlled by a terminal to generate light.

[0069] In addition, the correlated color temperature of the light generated from the light-emitting device (1) can be formed to be similar to the correlated color temperature of natural light. Natural light is light generated from the sun toward the space where the light-emitting device (1) is installed, and can change depending on time, weather, etc. In other words, the light-emitting device (1) can generate light whose correlated color temperature changes depending on time, weather, etc., but is not limited thereto.

[0070] The light emitting device (1) may include a housing (100), a heat sink (200), a cover (300), a light emitting device (400), a power distributor (500), and a controller (600), and may additionally include a microphone (700).

[0071] The housing (100) can accommodate a heat sink (200), a light emitter (400), and a controller (600). An opening can be formed on one side of the housing (100) so that the heat sink (200), the light emitter (400), and the controller (600) can be accommodated therein. The housing (100) can form the exterior of the light emitting device (1). For example, the housing (100) can be formed in various lighting shapes such as a bulb, a ball, an Edison bulb, a socket type such as a krypton or candlestick type, an EL type, a PAR type, a downlight, and the like, as well as various structures such as an automobile headlamp, an automobile rear light, and a mobile phone flash.

[0072] The heat sink (200) is provided inside the housing (100) and can dissipate heat inside the housing (100). In other words, the heat sink (200) can dissipate heat from the light emitter (400) and the controller (600). The heat sink (200) can be made of a material with high thermal conductivity, such as aluminum, copper, or iron, and can be made of a material with a thermal conductivity of 100 W / mK or higher. More preferably, it can have a thermal conductivity of 200 W / mK or higher, but is not limited thereto.

[0073] The cover (300) can be detachably coupled to the housing (100) to cover the opening of the housing (100). In addition, the cover (300) can be formed to transmit light generated from the light emitter (400), and preferably, a material having a transmittance of 80% or more can be used. The cover (300) can be made of a glass material such as soda lime glass, borosilicate glass, borosilicate, etc., and can be made of PP, PC, PMMA, acrylic resin, etc. In addition, when the light from the light emitter (400) is transmitted, the cover (300) can be coated with additives such as silica (SiO2), titanium dioxide (TiO2), alumina (Al2O3), barium sulfate (BaSO4) so ​​that the light is dispersed or diffused to increase color uniformity. In addition, the cover (300) can be manufactured in a shape such as a Fresnel shape or an uneven shape to increase color uniformity.

[0074] The light emitter (400) may be composed of one or more light emitting elements capable of generating light. The light emitter (400) may include a plurality of light emitting elements (410, 420) and a substrate (430). In addition, the light emitter (400) may have a wavelength converter. The wavelength converter may include a resin including a phosphor, QD, etc. For example, (Ba, Sr, Ca)2SiO4:Eu 2 + , YAG((Y, Gd)3(Al, Ga)5O 12 :Ce 3 + ) series fluorescent material, TAG((Tb, Gd)3(Al, Ga)5O 12 :Ce 3 + ) series fluorescent material, (Ba, Sr, Ca)3SiO5:Eu 2 + , (Ba, Sr, Ca)MgSi2O6:Eu 2 + , Mn 2 + , (Ba, Sr, Ca)3MgSi2O8: Eu 2 + , Mn 2+ and (Ba, Sr, Ca)MgSiO4:Eu 2 + , Mn 2 + , or A2MF6:Mn 4 + It may be a fluoride-based fluorescent substance represented by A, where A may be Li, Na, K, Ba, Rb, Cs, Mg, Ca, Se or Zn, and M may be at least one selected from the group consisting of Ti, Si, Zr, Sn or Ge.

[0075] The light emitter (400) may include two or more light emitters (410, 420) having different correlated color temperatures (CCT) as light emitters. The light emitter (400) may generate light between correlated color temperatures of the plurality of light emitters (410, 420) by combining the plurality of light emitters (410, 420). For example, the light emitter (400) including at least one of a plurality of first light emitters (410) that generate light with a correlated color temperature of 1700K or higher and at least one of a plurality of second light emitters (420) that generate light with a correlated color temperature of 7000K or lower may have a correlated color temperature between 1700K and 7000K.

[0076] In other words, the correlated color temperature of the light emitting device (400) including a plurality of first light emitting elements (410) and a plurality of second light emitting elements (420) may have a correlated color temperature that is equal to or higher than the average of the correlated color temperatures of the plurality of first light emitting elements (410) and equal to or lower than the average of the plurality of second light emitting elements (420).

[0077] In addition, the light emitting device (400) may include light emitting devices having two or more different wavelength spectra (correlated color temperatures) to express various colors, and may have different peak wavelengths. The light emitting device (400) may control the operation of the light emitting devices having two or more different peak wavelengths to generate light having various CIE color coordinates. For example, the first light emitting device (410) may emit light including red light having a peak wavelength of 600 nm to 750 nm, the second light emitting device (420) may emit light including blue light having a peak wavelength of 400 nm to 490 nm, and the light emitting device (400) may emit light between blue and red.

[0078] Referring further to FIGS. 4 to 7, a plurality of first light-emitting elements (410) and a plurality of second light-emitting elements (420) can generate light within a predetermined color temperature region on a color coordinate system. An average of the color coordinate values ​​of the plurality of light-emitting elements (410, 420) can be located within the color temperature region. At this time, the color coordinate can have a region within the CIE 1931 coordinate. The color temperature region can be formed in plurality. In other words, the average of the color coordinate values ​​of the plurality of light-emitting elements (410, 420) can be located inside any one of the plurality of color temperature regions. The plurality of color temperature regions can be arranged in the x-axis direction on the color coordinate system so that the y value increases as the x value among the color coordinate values ​​of the center point increases. In addition, the plurality of color temperature regions can include a first color temperature region (S1) and a second color temperature region (S2).

[0079] The first color temperature region (S1) may be a region in which the color coordinate value of the center point is the largest among the plurality of color temperature regions. The plurality of first light-emitting elements (410) may generate light within the first color temperature region (S1) of the color coordinate system. In other words, when the light intensity of the plurality of first light-emitting elements (410) increases and the light intensity of the plurality of second light-emitting elements (420) decreases, the average of the color coordinate values ​​of the light emitter (400) may move toward the first color temperature region (S1) as the color temperature regions of the plurality of first light-emitting elements (410) move in the direction in which they are arranged.

[0080] The second color temperature region (S2) may be an region in which the color coordinate value of the center point is the smallest among the plurality of color temperature regions. The plurality of second light-emitting elements (420) may generate light within the second color temperature region (S2) of the color coordinate system. In other words, when the light intensity of the plurality of second light-emitting elements (420) increases and the light intensity of the plurality of first light-emitting elements (410) decreases, the average of the color coordinate values ​​of the light emitter (400) may move toward the second color temperature region (S2) as the color temperature regions of the plurality of second light-emitting elements (420) move in the direction in which they are arranged. In addition, the plurality of color temperature regions may be formed in various shapes.

[0081] Referring to FIG. 4, as a first example, a plurality of color temperature regions may have a rectangular shape on the color coordinate system. The color temperature region may have a plurality of vertices having a first coordinate (P1), a second coordinate (P2), a third coordinate (P3), and a fourth coordinate (P4).

[0082] The first coordinate (P1) may have an x-value that is smaller than the x-values ​​of the second coordinate (P2) and the third coordinate (P3), and may have a y-value that is smaller than the y-values ​​of the second coordinate (P2), the third coordinate (P3), and the fourth coordinate (P4), but is not limited thereto. In other words, the x-value of the first coordinate (P1) of the first color temperature area (S1) may be smaller than the x-values ​​of the second coordinate (P2), the third coordinate (P3), and the fourth coordinate (P4). The y-value of the first coordinate (P1) of the first color temperature area (S1) may be smaller than the y-values ​​of the second coordinate (P2), the third coordinate (P3), and the fourth coordinate (P4). For example, the x-value of the first coordinate (P1) of the first color temperature area (S1) may be about 0.4373, and the y-value may be about 0.3893. In addition, the x value of the second coordinate (P2) may be about 0.4593, and the y value may be about 0.3944. The x value of the third coordinate (P3) may be about 0.4813, and the y value may be about 0.4319. In addition, the x value of the fourth coordinate (P4) may be about 0.45623, and the y value may be about 0.4260, but is not limited thereto. Furthermore, when a plurality of first light-emitting elements (410) have color coordinates within the first color temperature region (S1), the first light-emitting elements (410) may have a natural light similarity rms (Srms) value of less than 0.9 (details will be described later). Accordingly, the first light-emitting element (410) may have a spectrum similar to sunlight. In addition, the x value of the first coordinate (P1) in the second color temperature area (S2) may be located between the x value of the fourth coordinate (P4) and the x value of the second coordinate (P2). The y value of the first coordinate (P1) in the second color temperature area (S2) may be smaller than the y values ​​of the second coordinate (P2), the third coordinate (P3), and the fourth coordinate (P4). For example, the x value of the first coordinate (P1) in the second color temperature area (S2) may be about 0.3067, and the y value may be about 0.3119. In addition, the x value of the second coordinate (P2) may be about 0.3221, and the y value may be about 0.3255. The x value of the third coordinate (P3) may be about 0.3205, and the y value may be about 0.3477.In addition, the x-value of the fourth coordinate (P4) may be about 0.3026, and the y-value may be about 0.3311, but is not limited thereto. Furthermore, when a plurality of second light-emitting elements (420) have color coordinates within the second color temperature region (S2), the second light-emitting elements (420) may have a natural light similarity rms (Srms) value of less than 0.9 (details will be described later). Accordingly, the second light-emitting element (420) may have a spectrum similar to sunlight. The x-value of the first coordinate (P1) of the first color temperature region (S1) may have an x-value greater than the x-value of the first coordinate (P1) of the second color temperature region (S2). The first light emitting element (410) having color coordinates within the first color temperature region (S1) may have higher intensity in the red region than the second light emitting element (420) having color coordinates within the second color temperature region (S2). Accordingly, since the intensity in the red region can be compensated in the mixed light in which the lights emitted from the first light emitting element (410) and the second light emitting element (420) are mixed, the natural light similarity rms (Srms) value in the red light region can be improved. In addition, the y value of the first coordinate (P1) of the first color temperature region (S1) may have a larger y value than the y value of the first coordinate (P1) of the second color temperature region (S2). The first light emitting element (410) having color coordinates within the first color temperature region (S1) may have higher intensity in the green region than the second light emitting element (420) having color coordinates within the second color temperature region (S2). Accordingly, since the green region intensity can be compensated in the mixed light in which the light emitted from the first light emitting element (410) and the second light emitting element (420) are mixed, the natural light similarity rms (Srms) value in the green light region can be improved.

[0083] The second coordinate (P2) may have a y value that is smaller than the y values ​​of the third coordinate (P3) and the fourth coordinate (P4), and may have an x ​​value that is larger than the x value of the fourth coordinate (P4). In other words, the x value of the second coordinate (P2) in the first color temperature area (S1) may be smaller than the x value of the third coordinate (P3), and larger than the x values ​​of the fourth coordinate (P4) and the first coordinate (P1). The y value of the second coordinate (P2) in the first color temperature area (S1) may be smaller than the y values ​​of the third coordinate (P3) and the fourth coordinate (P4), and larger than the y value of the first coordinate (P1). In addition, the x value of the second coordinate (P2) in the second color temperature area (S2) may be larger than the x values ​​of the first coordinate (P1), the third coordinate (P3), and the fourth coordinate (P4). The y value of the second coordinate (P2) of the second color temperature region (S2) may be smaller than the y values ​​of the third coordinate (P3) and the fourth coordinate (P4), and may be larger than the y value of the first coordinate (P1). The x value of the second coordinate (P2) of the first color temperature region (S1) may have a larger x value than the x value of the second coordinate (P2) of the second color temperature region (S2). The first light-emitting element (410) having color coordinates within the first color temperature region (S1) may have a higher intensity in the red region than the second light-emitting element (420) having color coordinates within the second color temperature region (S2). Accordingly, the intensity in the red region of the mixed light in which the lights emitted from the first light-emitting element (410) and the second light-emitting element (420) are mixed may be compensated, so that the natural light similarity rms (Srms) value may be improved in the red light region. Additionally, the y value of the second coordinate (P2) of the first color temperature region (S1) may have a y value greater than the y value of the second coordinate (P2) of the second color temperature region (S2). The first light-emitting element (410) having color coordinates within the first color temperature region (S1) may have a higher intensity in the green region than the second light-emitting element (420) having color coordinates within the second color temperature region (S2).Accordingly, since the intensity of the green region of the mixed light emitted from the first light emitting element (410) and the second light emitting element (420) can be compensated, the natural light similarity rms (Srms) value in the green light region can be improved.

[0084] The third coordinate (P3) may have a y value greater than the y values ​​of the first coordinate (P1), the second coordinate (P2), and the fourth coordinate (P4). In addition, the third coordinate (P3) may have an x ​​value greater than the x values ​​of the first coordinate (P1) and the fourth coordinate (P4). In other words, the x value of the third coordinate (P3) in the first color temperature area (S1) may be greater than the x values ​​of the first coordinate (P1), the third coordinate (P3), and the fourth coordinate (P4). The y value of the third coordinate (P3) in the first color temperature area (S1) may be greater than the y values ​​of the first coordinate (P1), the second coordinate (P2), and the fourth coordinate (P4). In addition, the x-value of the third coordinate (P3) of the second color temperature region (S2) may be greater than the x-values ​​of the first coordinate (P1) and the fourth coordinate (P4) and less than the x-value of the third coordinate (P3). The y-value of the third coordinate (P3) of the second color temperature region (S2) may be greater than the y-values ​​of the first coordinate (P1), the second coordinate (P2) and the fourth coordinate (P4). The x-value of the third coordinate (P3) of the first color temperature region (S1) may have a greater x-value than the x-value of the third coordinate (P3) of the second color temperature region (S2). The first light-emitting element (410) having color coordinates within the first color temperature region (S1) may have a higher intensity in the red region than the second light-emitting element (420) having color coordinates within the second color temperature region (S2). Accordingly, since the intensity in the red region can be compensated in the mixed light in which the light emitted from the first light emitting element (410) and the second light emitting element (420) are mixed, the natural light similarity rms (Srms) value in the red light region can be improved. In addition, the y value of the third coordinate (P3) of the first color temperature region (S1) can have a larger y value than the y value of the third coordinate (P3) of the second color temperature region (S2). The first light emitting element (410) having color coordinates within the first color temperature region (S1) can have a higher intensity in the green region than the second light emitting element (420) having color coordinates within the second color temperature region (S2).Accordingly, since the green region intensity can be compensated in the mixed light in which the light emitted from the first light emitting element (410) and the second light emitting element (420) are mixed, the natural light similarity rms (Srms) value in the green light region can be improved.

[0085] The fourth coordinate (P4) may have a y-value that is greater than the y-values ​​of the first coordinate (P1) and the second coordinate (P2) and less than the y-value of the third coordinate (P3). In addition, the fourth coordinate (P4) may have an x-value that is less than at least one of the x-values ​​of the first coordinate (P1), the second coordinate (P2), and the third coordinate (P3). In other words, the x-value of the fourth coordinate (P4) in the first color temperature area (S1) may be greater than the x-value of the first coordinate (P1) and less than the x-values ​​of the second coordinate (P2) and the third coordinate (P3). The y-value of the fourth coordinate (P4) in the first color temperature area (S1) may be greater than the y-values ​​of the first coordinate (P1) and the second coordinate (P2), and less than the y-value of the third coordinate (P3). In addition, the x-value of the fourth coordinate (P4) of the second color temperature region (S2) may be smaller than the x-values ​​of the first coordinate (P1), the second coordinate (P2), and the third coordinate (34). The y-value of the fourth coordinate (P4) of the second color temperature region (S2) may be larger than the y-values ​​of the first coordinate (P1) and the second coordinate (P2), and smaller than the y-value of the third coordinate (P3). The x-value of the fourth coordinate (P4) of the first color temperature region (S1) may have a larger x-value than the x-value of the fourth coordinate (P4) of the second color temperature region (S2). The first light-emitting element (410) having color coordinates within the first color temperature region (S1) may have a higher intensity in the red region than the second light-emitting element (420) having color coordinates within the second color temperature region (S2). Accordingly, since the intensity in the red region can be compensated in the mixed light in which the light emitted from the first light emitting element (410) and the second light emitting element (420) are mixed, the natural light similarity rms (Srms) value in the red light region can be improved. In addition, the y value of the fourth coordinate (P4) of the first color temperature region (S1) can have a larger y value than the y value of the fourth coordinate (P4) of the second color temperature region (S2). The first light emitting element (410) having color coordinates within the first color temperature region (S1) can have a higher intensity in the green region than the second light emitting element (420) having color coordinates within the second color temperature region (S2).Accordingly, since the green region intensity can be compensated in the mixed light in which the light emitted from the first light emitting element (410) and the second light emitting element (420) are mixed, the natural light similarity rms (Srms) value in the green light region can be improved.

[0086] In addition, at least some of the sizes of the plurality of color temperature regions may be formed differently from each other. In other words, the sizes of the plurality of color temperature regions may increase toward the first color temperature region (S1). The size of the first color temperature region (S1) may be formed to be larger than the size of the second color temperature region (S2). The distance between the first coordinate (P1) and the third coordinate (P3) of the plurality of color temperature regions may increase toward the first color temperature region (S1). In this way, by expanding the range of the first color temperature region (S1) having a relatively smaller slope change in the natural light spectrum, the design complexity can be reduced, and the natural light similarity rms (Srms) value can be maintained at 0.9 or less. In addition, the plurality of color temperature regions may be arranged such that at least some of them are adjacent to each other.

[0087] Referring to Fig. 5, as a second example, a plurality of color temperature regions may have an elliptical shape on the color coordinate system. A light source within one of the plurality of ellipses may have a similar color that is perceived similarly by the eyes of a general human, thereby making it possible to produce a light-emitting device with less color difference. The length of the major axis of the plurality of color temperature regions may be 0.0110 or more and 0.0144 or less, and the length of the minor axis may be 0.0045 or more and 0.0066 or less, but is not limited thereto. Referring to Fig. 7, the plurality of color temperature regions of the second example may be formed smaller than the plurality of color temperature regions of the first example. A light source within one of the plurality of ellipses may be perceived similarly by the eyes of a general human, and may also be perceived as a similar color by the eyes of a person with high sensitivity or when a plurality of ellipses are arranged adjacently, thereby making it possible to produce a premium light-emitting device. The color temperature region of the second example may be arranged inside each of the plurality of color temperature regions of the first example. The color coordinate values ​​of the center of the color temperature gamut of the second example and the coordinate values ​​of the center of the color temperature gamut of the first example may be different from each other.

[0088] In addition, the plurality of color temperature regions of the second example may be tilted at a predetermined angle with respect to the x-axis on the color coordinate system. The predetermined angle may be 40° or more and 70° or less, but is not limited thereto. In addition, the tilted angles of at least some of the plurality of color temperature regions may be formed differently. The tilted angle of the first color temperature region (S1) may be formed different from the tilted angle of the second color temperature region (S2). In other words, the tilted angle of the first color temperature region (S1) may be greater than the tilted angle of the second color temperature region (S2). These plurality of color temperature regions may be arranged to be spaced apart from each other. In addition, the sizes of at least some of the plurality of color temperature regions may be formed differently from each other.

[0089] Referring to FIGS. 6 and 7, in a third example, the color temperature region may be formed in an elliptical shape that is smaller than the color temperature region of the second example on the color coordinate system. In other words, the color temperature region of the third example may be located inside each of the color temperature regions of the second example. The length of the major axis of this color temperature region may be 0.0066 or more and 0.0086 or less, and the length of the minor axis may be 0.0027 or more and 0.0040 or less. Through this, a high-quality light-emitting device with less chromatic aberration in the color temperature region of the third example can be implemented than that of the second example.

[0090] In addition, the color temperature region of the third example may be tilted at a predetermined angle with respect to the x-axis on the color coordinate system. For example, the predetermined angle may be 40° or more and 70° or less. The tilted angle of the color temperature region of the third example may be the same as the tilted angle of the color temperature region of the second example. In other words, the tilted angle of the first color temperature region (S1) may be greater than the tilted angle of the second color temperature region (S2). This means that the greater the tilt of the color temperature line of the blackbody locus, the greater the device tilt, and through this, a region having a similar color temperature can be selected to implement a high-quality light-emitting device with less chromatic aberration. Such a plurality of color temperature regions may be arranged to be spaced apart from each other. In addition, the sizes of at least some of the plurality of color temperature regions may be formed differently.

[0091] The substrate (430) can support a plurality of first light-emitting elements (410) and a plurality of second light-emitting elements (420). The substrate (430) may be a substrate made of alumina, quartz, calcium zirconate, forsterite, SiC, graphite, fused silica, mullite, cordierite, zirconia, beryllia, and aluminum nitride, LTCC (low temperature co-fired cermic), paper phenolic, epoxy resin, and glass or paper combined therewith, or a wiring section made of metals and metal compounds such as Cu, Al, Ag, Au, Ni, and W may be added on an insulating layer made of PI (Polyimide), BT (Bismaleimide / Triazine), Teflon, PMMA, PC (Polycarbonate), etc. The above substrate (430) may be a printed circuit board (PCB) including metal wiring.

[0092] The power distributor (500) is controlled by the controller (600) to apply power input from the outside to one or more of the first light-emitting element (410) and the second light-emitting element (420). In addition, the power distributor (500) can adjust the power applied to the first light-emitting element (410) and the power applied to the second light-emitting element (420). The light intensities of the first light-emitting element (410) and the second light-emitting element (420) can be changed by the power distributor (500), thereby adjusting the correlated color temperature. In addition, the power distributor (500) can adjust the natural light similarity rms (Srms) value of the mixed light to a value less than 0.9 by adjusting the intensity of the light emitted from the first light-emitting element (410) and the second light-emitting element (420). Accordingly, a light-emitting device (1) that emits light similar to natural light can be implemented.

[0093] For example, when the power applied to the first light-emitting element (410) increases by the power distributor (500), the light intensity of the first light-emitting element (410) may increase, and when the power applied to the second light-emitting element (420) decreases, the light intensity of the second light-emitting element (420) may decrease. The correlated color temperature of the light-emitting device (400) may have a correlated color temperature that is closer to the first light-emitting element (410) than to the second light-emitting element (420), and may have a correlated color temperature that is relatively farther away than to the second light-emitting element (420). In addition, the average of the color coordinate values ​​of the first light-emitting element (410) and the second light-emitting element (420) may be positioned within the first color temperature region (S1) or may be positioned closer to the first color temperature region (S1) than to the second color temperature region (S2).

[0094] As another example, when the power applied to the first light-emitting element (410) becomes smaller by the power distributor (500), the light intensity of the first light-emitting element (410) may decrease, and when the power applied to the second light-emitting element (420) becomes larger, the light intensity of the second light-emitting element (420) may increase. The correlated color temperature of the light-emitting device (400) may have a correlated color temperature that is closer to the second light-emitting element (420) than to the first light-emitting element (410), and may have a correlated color temperature that is relatively further from the first light-emitting element (410). In addition, the average of the color coordinate values ​​of the first light-emitting element (410) and the second light-emitting element (420) may be positioned within the second color temperature region (S2) or may be positioned closer to the second color temperature region (S2) than to the first color temperature region (S1).

[0095] In addition, when the power distributor (500) adjusts the power applied to the first light-emitting element (410) and the second light-emitting element (420) so that the light quantity of the first light-emitting element (410) and the light quantity of the second light-emitting element (420) are adjusted to be the same, the correlated color temperature of the light-emitting device (400) can have a correlated color temperature between the first light-emitting element (410) and the second light-emitting element (420). More preferably, when the light quantity of the first light-emitting element (410) and the light quantity of the second light-emitting element (420) are the same, the light-emitting device (400) can have a correlated color temperature of 3900K or 4500K. In addition, the average of the color coordinate values ​​of the first light-emitting element (410) and the second light-emitting element (420) can be located between or at the center of the first color temperature region (S1) and the second color temperature region (S2).

[0096] Alternatively, the power distributor (500) can control the power amount of the first light-emitting element (410) and the second light-emitting element (420) by adjusting the time at which power is supplied. The time at which power is supplied can be adjusted by increasing or decreasing the duty cycle at which power is supplied. That is, when the duty cycle increases, the power amount increases, and the light amount of the first light-emitting element (410) and the second light-emitting element (420) increases, and when the duty cycle decreases, the power amount decreases, and the light amount of the first light-emitting element (410) and the second light-emitting element (420) may decrease. The light intensity of the first light-emitting element (410) and the second light-emitting element (420) can be changed by the power distributor (500). For example, when the duty cycle applied to the first light-emitting element (410) increases, the light intensity of the first light-emitting element (410) increases, and when the duty cycle applied to the second light-emitting element (420) decreases, the amount of power decreases, so that the light intensity of the second light-emitting element (420) may decrease, and the correlated color temperature of the light emitter (400) may have a correlated color temperature closer to the first light-emitting element (410) than to the second light-emitting element (420). As another example, when the duty cycle applied to the first light-emitting element (410) decreases, the amount of power decreases, thereby reducing the light intensity of the first light-emitting element (410), and when the duty cycle applied to the second light-emitting element (420) increases, the amount of power increases, thereby increasing the light intensity of the second light-emitting element (420). The correlated color temperature of the light emitter (400) may have a correlated color temperature that is closer to the second light-emitting element (420) than to the first light-emitting element (410), and may have a correlated color temperature that is relatively farther from the first light-emitting element (410).In addition, by controlling the duty cycle applied to the first light-emitting element (410) and the second light-emitting element (420) so that the light quantity of the first light-emitting element (410) and the light quantity of the second light-emitting element (420) are controlled to be the same, the correlated color temperature of the light-emitting device (400) can have a correlated color temperature between the first light-emitting element (410) and the second light-emitting element (420), and more preferably, can have a correlated color temperature of 3900K to 4500K.

[0097] The controller (600) can control one or more of the light emitter (400) and the power distributor (500) so that light is generated from the light emitter (400). The controller (600) can control the light intensity of the plurality of first light emitting elements (410) and the plurality of second light emitting elements (420) so that the average of the color coordinate values ​​of the plurality of first light emitting elements (410) and the plurality of second light emitting elements (420) is located within one of the plurality of color temperature regions. In other words, the controller (600) can control the light intensity of the plurality of first light emitting elements (410) and the plurality of second light emitting elements (420) by controlling the power distributor (500).

[0098] In addition, the controller (600) can control the light intensity of the plurality of first light-emitting elements (410) and the light intensity of the plurality of second light-emitting elements (420) so that the average of the color coordinate values ​​of the plurality of first light-emitting elements (410) and the plurality of second light-emitting elements (420) moves from one of the first color temperature region (S1) and the second color temperature region (S2) toward the other of the first color temperature region (S1) and the second color temperature region (S2). The controller (600) can increase the light intensity of the plurality of first light-emitting elements (410) and decrease the light intensity of the plurality of second light-emitting elements (420) so that the average of the color coordinate values ​​of the plurality of first light-emitting elements (410) and the plurality of second light-emitting elements (420) moves toward the first color temperature region (S1). The controller (600) can reduce the light intensity of the plurality of first light-emitting elements (410) and the light intensity of the plurality of second light-emitting elements (420) so that the average of the color coordinate values ​​of the plurality of first light-emitting elements (410) and the plurality of second light-emitting elements (420) moves toward the second color temperature region (S2).

[0099] In addition, the controller (600) can form the light intensity of the plurality of first light-emitting elements (410) and the light intensity of the plurality of second light-emitting elements (420) to be the same so that the average of the color coordinate values ​​of the plurality of first light-emitting elements (410) and the plurality of second light-emitting elements (420) is arranged in one of the plurality of color temperature regions, and is arranged at the center of the first color temperature region (S1) and the second color temperature region (S2).

[0100] A microphone (700) may be additionally placed. The microphone (700) can input sounds generated in the space where the light emitting device (1) is installed. For example, the sounds input to the microphone (700) may be various sounds such as movie sounds and music. By means of the microphone (700), the controller (600) can control the light emitting device (400) so that the correlated color temperature of the light emitting device (400) changes based on the sound. In other words, the controller (600) can control the light emitting device (400) so that the color temperature of the light emitting device (400) changes according to the size of the sound input to the microphone (700). For example, when the size of the sound increases, the correlated color temperature of the light emitting device (400) increases, and when the size of the sound decreases, the light emitting device (400) can be controlled by the controller (600) so that the correlated color temperature of the light emitting device (400) decreases.

[0101] Hereinafter, 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 the controller (600) controls the light emitting device (400) so that the natural light similarity rms satisfies a range of 0.001 or more and 0.9 or less, and this difference will be mainly described.

[0102] The light emitting device (400) and the light emitting device (1) may have a spectral flux for each wavelength similar to natural light. The light emitting device (400) having a spectral flux for each wavelength similar to natural light may be formed so that the Srms for the natural light similarity rms according to the wavelength in mathematical expression 1 satisfies a range of 0.001 or more and 0.9 or less. In this case, Srms is the natural light similarity rms (Srms). The closer the natural light similarity (Srms) is to 0, the higher the similarity to natural light. If the natural light similarity rms (Srms) value exceeds 0.9, the similarity with the natural light spectrum decreases, which may lower color reproducibility and deteriorate light quality. In addition, if the Srms value falls below 0.001, the design complexity may increase significantly to the point where it exceeds the range that a user can perceive.

[0103] [Mathematical Formula 1]

[0104]

[0105] In mathematical expression 1, a is a wavelength selected within a range of 200 nm to less than 500 nm, and b is a wavelength selected within a range of 500 nm to less than 900 nm. L C (x k ) is the normalized spectral radiant flux of the light emitted from the light emitter (400). ref c (x k ) is the normalized spectral radiant flux of natural light, normalized from the natural light spectrum.

[0106] The normalized radiant spectrum of natural light can be obtained based on the highest radiant flux value in the spectrum of natural light.

[0107] The normalized radiant power spectrum of the emitted light is the radiant power spectrum of the natural light normalized from the spectrum of the emitter (400) weighted by taking human visual sensitivity into account B(x k ) and the area obtained by multiplying the radiant flux spectrum of the light emitter (400) by a weight considering human visual sensitivity have the same area, so that the normalized luminous flux spectrum of the emitted light (normalized spectral radiant flux), i.e., L1(x k ) can be obtained. In other words, ref c (x k ) and the relative luminous speed (normalized luminousfulx) of L c (x k ) are normalized to have the same value.

[0108] That is, the wavelength spectrum for human visual sensitivity is B(x k ), the normalized radiant spectrum L of the emitted light c (x k ) and the normalized radiant spectrum of natural lightref c (x k ) satisfies the following mathematical equation.

[0109] [Equation 2]

[0110]

[0111] In the above mathematical formula 1 is the natural light similarity S(x) according to wavelength k ) is shown. At this time, the closer the similarity value with nature is to 0 at each wavelength, the higher the similarity of the light emitting device (1) or light emitting device (400) to natural light in the corresponding wavelength range.

[0112] To improve the natural light similarity root mean square (Srms), the light emitter (400) may include at least one light emitting element, which may have a peak wavelength within a blue wavelength range of 400 nm to 480 nm. By increasing the intensity in the blue region, the natural light similarity root mean square (Srms) in the blue light region may be improved. In addition, to further improve the natural light similarity in the blue region, the light emitter (400) may include at least two light emitting elements having different peaks. In this case, the difference in peak wavelength between the two light emitting elements may be set to 10 nm or less, thereby improving the natural light similarity without increasing chromatic aberration.

[0113] To further improve the light-similarity root mean square (Srms), the light emitter (400) may include a wavelength converter comprising at least two types of phosphors. Each of the phosphors comprises a trace amount of luminescent ions within the host material, and the luminescent ions may differ between the two phosphors. For example, to improve the light-similarity root mean square (Srms) in the green-yellow wavelength range (480 nm to 590 nm), the wavelength converter may include at least one green or yellow phosphor. Such phosphors may include YAG, LSN, LYSN, SiAlON, GYAG, LuAG, ZnZ, or Gd3Ga5O12, and Ce3+ may be used as the luminescent ion. Additionally, to increase the intensity in the red region and improve the Srms for the red light region, the wavelength converter may include at least one red phosphor. Examples of red phosphors include (Ca,Sr)AlSiN3+, La2O2S+, (La,Sr)AlO3 or CaAl2O4, and Eu2+ or Eu3+ can be used as the luminescent ion.

[0114] Additionally, to further improve the Srms in the red region, two types of red phosphors with different peak wavelengths can be used. In this case, the difference in peak wavelength between the two types of red phosphors can be greater than 20 nm, which can increase the intensity and improve the Srms in the red region at both short and long wavelengths.

[0115] Additionally, to improve Srms in the green-yellow region, one green phosphor and the other yellow phosphor can be used. These green and yellow phosphors can have peak differences of at least 10 nm, which can enhance the intensity in the green and yellow regions, further improving Srms.

[0116] As illustrated in Fig. 8, the natural light similarity of the light emitting device (1) and the light emitting device (400) may have different natural light similarity in each wavelength range.

[0117] At this time, the similarity to natural light at 430 nm to 470 nm may be relatively low compared to other regions (excluding the region from 430 nm to 470 nm). At this time, the similarity to natural light may be a value between -2.5 and 1. In addition, the similarity to natural light at 530 nm to 680 nm may be higher than other regions (also excluding the region from 530 nm to 680 nm), and preferably may be a value between -1.5 and 1. If the similarity to natural light is high in the region from 530 nm to 680 nm, which is a longer wavelength region than the blue region, it can have a high color rendering index for the red or yellow region, so that a high-quality light-emitting device can be implemented. In addition, if the light in the blue region from 430 nm to 470 nm is higher than that of natural light, the user can feel that the similar light quantity is brighter, so it can be applied to security lights, etc.

[0118] In addition, if the correlated color temperature is different, the natural light similarity may have different values. For example, the higher the correlated color temperature, the higher the natural light similarity may be. In other words, the lower the correlated color temperature, the lower the natural light similarity may be, and vice versa. For example, if the correlated color temperature of the first light emitting element (410) in the light emitting device (400) is lower than that of the second light emitting element (420), the natural light similarity of the first light emitting element (410) may have a natural light similarity lower than that of the second light emitting element (420). In addition, the light emitting device (400) may have a natural light similarity that is equal to or higher than that of the first light emitting element (410), and may have a natural light similarity lower than that of the second light emitting element (420). More preferably, the natural light similarity between 430 nm and 730 nm may be such that the first light-emitting element (410) may have a lower correlated color temperature than the second light-emitting element (420), and the natural light similarity between 430 nm and 730 nm of the light emitter (400) may have a natural light similarity that is higher than or equal to the first light-emitting element (410) and a natural light similarity that is lower than or equal to the second light-emitting element (420). Meanwhile, when the first light-emitting element (410) and the second light-emitting element (420) are in different low color temperature first color temperature region (S1) and high second color temperature region (S2), respectively, the natural light similarity (Srms1) of the first light-emitting element (410) may be higher than the natural light similarity (Srms2) of the second light-emitting element (420), as in the following mathematical expression 3. A high natural light similarity may result in a low Srms value.

[0119] [Equation 3]

[0120] Srms1 < Srms2

[0121] In mathematical expression 3, Srms1 is the natural light similarity rms of the first light-emitting element (410), and Srms2 is the natural light similarity rms of the second light-emitting element (420).

[0122] At this time, the difference between the natural light similarity rms (Srms1) of the first light-emitting element (410) and the natural light similarity rms (Srms2) of the second light-emitting element (420) may be 0.2 or less, as shown in the mathematical expression 4 below. This can ensure that the natural light similarity rms (Srms) value of the mixed light in which the light emitted from the first light-emitting element (410) and the second light-emitting element (420) is mixed does not exceed 0.9, thereby reducing the design complexity of the light-emitting device (1).

[0123] [Equation 4]

[0124] |Srms1 - Srms2|≤ 0.2

[0125] In addition, the natural light similarity rms (Srms(sum)) of the mixed light of the first light-emitting element (410) and the second light-emitting element (420) may be lower than the natural light similarity rms of the first light-emitting element (410) or the natural light similarity rms of the second light-emitting element (420), as shown in the following mathematical expressions 5 and 6.

[0126] [Equation 5]

[0127] Srms1 > Srms(sum)

[0128] [Equation 6]

[0129] Srms2 > Srms(sum)

[0130] In mathematical expressions 5 and 6, Srms(sum) is the natural light similarity rms(Srms(sum)) of the mixed light.

[0131] In addition, the difference between the natural light similarity rms (Srms(sum)) of the mixed light and the natural light similarity rms of the first light-emitting element (410) or the natural light similarity rms of the second light-emitting element (420) may be 0.2 or less, as shown in the mathematical expression 7 below. This can ensure that the natural light similarity rms (Srms(sum)) value of the mixed light emitted from the first light-emitting element (410) and the second light-emitting element (420) does not exceed 0.9, thereby reducing the design complexity of the light-emitting device (1).

[0132] [Equation 7]

[0133] Srms1 - Srms(sum) ≤ 0.2, Srms2 - Srms(sum) ≤ 0.2

[0134] In particular, the lower the color temperature of the first light-emitting element (410) and the second light-emitting element (420) in the same color region, the higher the natural light similarity may be. For example, when the first light-emitting element (410) is located to the left of the second light-emitting element (420) in the first color temperature region (S1), the first light-emitting element (410) may have a lower natural light similarity than the second light-emitting element (420). In addition, when the first light-emitting element (410) is located in a lower region of the first color temperature region (S1) than the second light-emitting element (420), the first light-emitting element (410) may have a lower natural light similarity than the second light-emitting element (420). In addition, the mixed light in which the light of the first light emitting element (410) is mixed with the light of the second light emitting element (420) can be located between the color coordinates of the first light emitting element (410) and the second light emitting element (420) in the first color temperature region (S1), and the natural light similarity of the mixed light can have a value between the natural light similarity of the first light emitting element (410) and the natural light similarity of the second light emitting element (420).

[0135] In addition, the natural light similarity by wavelength can have a higher natural light similarity in the sensitive region of human vision, which is the 510 nm to 630 nm region, than in other regions, and by increasing the natural light similarity in the region where human vision is sensitive, a light emitting device with high color reproducibility can be implemented while minimizing the impact on light efficiency. In addition, the natural light similarity in the sensitive region can be high in a light emitting element with a low color temperature. In addition, the higher the correlated color temperature, the lower the natural light similarity in the sensitive region can be. For example, when the correlated color temperature of the first light emitting element (410) in the light emitting device (400) is higher than that of the second light emitting element (420), the natural light similarity in the sensitive region of the first light emitting element (410) can have a lower natural light similarity in the sensitive region than that of the second light emitting element (420). Additionally, the light emitter (400) having mixed light may have a sensitivity region natural light similarity that is equal to or higher than that of the first light emitter (410), and may have a sensitivity region natural light similarity that is lower than that of the second light emitter (420).

[0136] In addition, the natural light similarity in the sensitive region may not be proportional to the natural light similarity relationship. For example, a light emitting element having a high correlated color temperature may have a higher natural light similarity than a light emitting element having a low correlated color temperature, and the natural light similarity in the sensitive region may be higher in a light emitting element having a low correlated color temperature. For example, in the light emitting device (400), when the first light emitting element (410) has a higher correlated color temperature than the second light emitting element (420), the natural light similarity of the first light emitting element (410) may be higher than that of the second light emitting element, and the natural light similarity in the sensitive region may have a lower natural light similarity in the sensitive region than that of the second light emitting element (420). This is because a light emitting element having a relatively high correlated color temperature requires less light in the long wavelength region than a light emitting element having a low correlated color temperature, and long wavelength conversion can be performed only as much as necessary to improve light efficiency.

[0137] In addition, the standard deviation of natural light similarity by wavelength (S(x))k ) may be higher for the first light emitting element (410) than for the second light emitting element (420). In addition, the standard deviation of the natural light similarity of the light emitting device (400) may be an intermediate value between the first light emitting element (410) and the second light emitting element (420), and may have a standard deviation that is equal to or lower than that of the first light emitting element (410) and a high standard deviation that is equal to or lower than that of the second light emitting element (420).

[0138] In addition, the Srms value may be lower for the first light emitting element (410) than for the second light emitting element (420) in the light emitter (400) when the correlated color temperature of the first light emitting element (410) is lower than that of the second light emitting element (420). In other words, the second light emitting element (420) may have a higher Srms value than the first light emitting element (410) and may be considered to have a similar luminous flux by wavelength to natural light. In addition, the Srms value of the light emitter (400) may have an Srms value between the first light emitting element (410) and the second light emitting element (420), and more preferably, may have an Srms value higher than that of the first light emitting element (410) and lower than that of the second light emitting element (420).

[0139] Figures 9 to 13 show the relative luminous flux of natural light by wavelength. Referring to Figure 9, the relative luminous flux of natural light by wavelength at a correlated color temperature of 6500 K can be formed the largest in the range of 440 nm to 480 nm. In other words, the relative luminous flux can be formed the largest as 1 at 460 nm. Referring to Figure 10, the relative luminous flux of natural light by wavelength at a correlated color temperature of 5000 K can be formed the largest in the range of 530 nm to 680 nm. In other words, the relative luminous flux can be formed the largest as 1 at 550 nm. Referring to Figure 11, the relative luminous flux of natural light by wavelength at a correlated color temperature of 4000 K can be formed the largest in the range of 700 nm to 750 nm. In other words, the relative luminous flux can be formed the largest as 1 at 733 nm. Referring to Fig. 12, the relative luminous flux by wavelength of natural light at a correlated color temperature of 3000 K can be formed the largest in the section from 750 nm to 780 nm. In other words, the relative luminous flux can have a peak value of 1 at 780 nm. Referring to Fig. 13, the relative luminous flux by wavelength of natural light at a correlated color temperature of 2700 K can be formed the largest in the section from 750 nm to 780 nm. In other words, the relative luminous flux can have a peak value of 1 at 780 nm. As the spectrum of natural light decreases, the wavelength value that forms the largest relative luminous flux value can increase.

[0140] The controller (600) can control the light emitter (400) so that light is generated from the light emitter (400). In addition, the controller (600) can control the light emitter (400) so that light is generated in which Srms in mathematical expression 1 satisfies a range of 0.001 or more and 0.9 or less. This can be used to generate light similar to sunlight. In addition, the controller (600) can control the light emitter (400) based on input data input from the terminal (2). The input data can include one or more of color coordinates, color temperature, location information, weather information, input time value, input date value, and one or more commands for controlling the light emitter (1). Such input data can be input by a user operating the terminal.

[0141] Referring to FIG. 14, there is an example of a case where the second light-emitting element (420) has a lower color temperature than the first light-emitting element (410) and the color coordinate shift of the first light-emitting element (410) with respect to the mixed light of the second light-emitting element (420).

[0142] The controller (600) can adjust the driving ratio of the first light-emitting element (410) and the second light-emitting element (420) to form mixed light between the first light-emitting element (410) and the second light-emitting element (420). At this time, the natural light similarity of the mixed light may be a value between the natural light similarities of the first light-emitting element (410) and the second light-emitting element (420). For example, when the Srms value of the first light-emitting element (410) is 0.9 and the Srms value of the second light-emitting element (420) is 0.5, the controller (600) can adjust the driving ratio of the first light-emitting element (410) and the second light-emitting element (420) to lower the Srms value of the mixed light to 0.9 or less. That is, the controller (600) can adjust the driving ratio of the plurality of light-emitting elements so that the Srms value of the mixed light is formed lower than the maximum Srms value of the plurality of light-emitting elements. Through this process, a light-emitting device (1) capable of emitting light similar to natural light can be implemented. The mixed light can have a larger x-value than the first light-emitting element (410) and a lower x-value than the second light-emitting element (420). In addition, the mixed light can have a larger y-value than the first light-emitting element (410) and a lower y-value than the second light-emitting element (420).

[0143] Also, referring to FIG. 15, there is provided an example of a first light-emitting element (410) having a high color temperature, a second light-emitting element (420) having a low color temperature, and the natural light similarity of the two mixed lights. The first light-emitting element (410) may have a color temperature of 6500K. The second light-emitting element (420) may have a color temperature of 2700K. The mixed light may have a color temperature between 2700K and 6500K. The first light-emitting element (410) may have a lower natural light similarity than the second light-emitting element (420). The second light-emitting element (420) having a lower color temperature may have a higher natural light similarity in its sensitive region than the first light-emitting element (410) having a high natural light similarity in its sensitive region in the region from 510nm to 630nm. In addition, the natural light similarity of each wavelength in the sensitive region of the mixed light can be located between the natural light similarity of the first light emitting element (410) and the second light emitting element (420) in terms of wavelength. In one wavelength region, the natural light similarity can be higher than that of the first light emitting element (410) and lower than that of the second light emitting element (420). In one wavelength region, the natural light similarity can be lower than that of the first light emitting element (410) and higher than that of the second light emitting element (420). Since the natural light similarity in the sensitive region (510 nm to 630 nm) of the mixed light can be higher than that of the first light emitting element (410) and the second light emitting element (420), the natural light similarity can be increased without increasing the amount of phosphor used by using two or more light emitting elements, thereby reducing the difficulty of manufacturing.

[0144] In addition, referring further to FIG. 16, the controller (600) can control the light intensity of the first light-emitting element (410) and the light intensity of the second light-emitting element (420) based on time-light intensity correlation information. In addition, the controller (600) can store light intensity data for adjusting the light intensity of the first light-emitting element (410) and the light intensity of the second light-emitting element (420). The light intensity data can include a first adjustment value for determining the intensity of the first light-emitting element (410) and a second adjustment value for determining the intensity of the second light-emitting element (420). The first adjustment value can be power applied to the first light-emitting element (410) so that the first light-emitting element (410) emits light. The second adjustment value can be power applied to the second light-emitting element (420) so that the second light-emitting element (420) emits light. The controller (600) can control the power distributor (500) based on the first adjustment value and the second adjustment value. In other words, the controller (600) can control the power distributor (500) so that the first adjustment value is applied to the first light-emitting element (410) and the second adjustment value is applied to the second light-emitting element (420).

[0145] Table 1 is an example table showing the correlation information between the first and second adjustment values ​​according to color temperature.

[0146] colorLight SourceRemark12WarmCoolModuleNoon(Reference)0%100%cool white▼30%70%Daylight60%40%Neutral white▼90%10%Sunset(Start) / Sunrise(End)100%0%Warm white

[0147] Referring to Table 1, when the first light-emitting device has a low color temperature and the second light-emitting device has a high color temperature, as the color temperature increases, the first adjustment value applied to the first light-emitting device may decrease and the second adjustment value applied to the second light-emitting device may increase. In other words, as the color temperature increases, the light intensity of the second light-emitting element (420) increases, so that the proportion of the light of the second light-emitting element (420) in the light of the light-emitting device (400) increases, and the proportion of the light of the first light-emitting element (410) decreases, and the correlated color temperature of the light-emitting device (400) may have a correlated color temperature closer to the second light-emitting element (420) than to the first light-emitting element (410) and may have a higher color temperature than the first light-emitting element (410). In addition, as the color temperature decreases, the second adjustment value may decrease and the first adjustment value may increase. In other words, as the color temperature decreases, the intensity of light from the first light-emitting element (410) increases, so that the ratio of light from the second light-emitting element (420) in the light from the light emitter (400) decreases, and the ratio of light from the first light-emitting element (410) may increase, and the correlated color temperature of the light emitter (400) may have a correlated color temperature closer to the first light-emitting element (410) than to the second light-emitting element (420), and may have a correlated color temperature lower than that of the second light-emitting element (420).

[0148] This light-emitting device (1) can generate light having a correlated color temperature similar to that of natural light, and can emit light having a spectrum of luminous flux for each wavelength of the light-emitting device (1) similar to that of natural light having the same correlated color temperature. In other words, the luminous flux for each wavelength of light generated from the light-emitting device (1) can be formed so that Srms satisfies a range of 0.001 or more and 1 or less in mathematical expression 1. At this time, it can preferably have an Srms value of 0.05 or more and 0.9 or less so as to have a large influence on human visual sensitivity.

[0149] For example, when the light emitter (400) emits light with a correlated color temperature of 6500K, Srms can be formed to be 0.05 to 0.70, when the light emitter (400) emits light with a correlated color temperature of 4000K, Srms can be formed to be 0.05 to 0.70, and when the light emitter (400) emits light with a correlated color temperature of 2700K, Srms can be formed to be 0.40 to 0.75.

[0150] Although the embodiments of the present invention have been described as specific embodiments, these are merely examples, and the present invention is not limited thereto, but should be construed to have the broadest scope in accordance with the technical concepts disclosed in this specification. Those skilled in the art may combine / substitute the disclosed embodiments to implement patterns of shapes not specified, but this also does not depart from the scope of the present invention. In addition, those skilled in the art may easily modify or alter the disclosed embodiments based on this specification, and it is clear that such modifications or alterations also fall within the scope of the present invention.

Claims

1. Contains a plurality of light-emitting elements that generate light within a predetermined color temperature range on a color coordinate system, The average of the color coordinate values ​​of the above plurality of light-emitting elements is located within the above-described color temperature range, The above plurality of light-emitting elements include a first light-emitting element and a second light-emitting element satisfying the following mathematical expression 1, [Mathematical Formula 1] In the above mathematical expression 1, a is a wavelength selected within a range of 200 nm to less than 500 nm, b is a wavelength selected within a range of 500 nm to less than 900 nm, and L C (x k ) is the normalized radiant spectrum of light emitted from the plurality of light-emitting elements, and the ref c (x k ) is the normalized radiant spectrum of natural light, normalized from the natural light spectrum. Light-emitting device.

2. In paragraph 1, The above color temperature area has vertices of the first coordinate, the second coordinate, the third coordinate, and the fourth coordinate on the color coordinate system, The above first coordinate is, having an x ​​value smaller than the x values ​​of the second coordinate and the third coordinate, and having a y value smaller than the y values ​​of the second coordinate, the third coordinate and the fourth coordinate, The above second coordinate is, having a y value smaller than the y values ​​of the third coordinate and the fourth coordinate, The above third coordinate is, having a y value greater than the y values ​​of the first coordinate, the second coordinate and the fourth coordinate, and having an x ​​value greater than the x values ​​of the first coordinate and the fourth coordinate, The above fourth coordinate is, having a y value greater than the y values ​​of the first and second coordinates and less than the y value of the third coordinate, and having an x ​​value less than the x values ​​of the second and third coordinates, Light-emitting device.

3. In paragraph 1, The above color temperature area has an elliptical shape on the color coordinate system. Light-emitting device.

4. In paragraph 3, The above color temperature area is tilted at a predetermined angle with respect to the x-axis on the color coordinate system. Light-emitting device.

5. In paragraph 4, The above specified angle is 40° or more and 70° or less, Light-emitting device.

6. In paragraph 3, The length of the major axis of the above color temperature range is 0.0110 or more and 0.0144 or less. Light-emitting device.

7. In paragraph 4, The length of the short axis of the above color temperature range is 0.0045 or more and 0.0066 or less. Light-emitting device.

8. In paragraph 1, The color temperature of light of the above plurality of light-emitting elements is 1700K to 7000K. Light-emitting device.

9. A plurality of first light-emitting elements that generate light within a first color temperature region among a plurality of color temperature regions on a color coordinate system; A plurality of second light-emitting elements that generate light within a second color temperature region different from the first color temperature region among a plurality of color temperature regions on a color coordinate system; and A controller is included that controls the light intensity of the plurality of light-emitting devices so that the average of the color coordinate values ​​of the plurality of first light-emitting devices and the plurality of second light-emitting devices is located within one of the plurality of color temperature regions. The above controller controls the plurality of first light-emitting elements and the plurality of second light-emitting elements so that the following mathematical expression 1 is satisfied, [Mathematical formula 1] In the above mathematical expression 1, a is a wavelength selected within a range of 200 nm to less than 500 nm, b is a wavelength selected within a range of 500 nm to less than 900 nm, and L C (x k ) is the normalized radiant spectrum of light emitted from the plurality of light-emitting elements, and the ref c (x k ) is the normalized radiant spectrum of natural light, normalized from the natural light spectrum. Light-emitting device.

10. In paragraph 9, The above first color temperature area has the largest color coordinate value at the center among the plurality of color temperature areas, The above second color temperature area is the area where the color coordinate value of the center point among the plurality of color temperature areas is the smallest. The above controller, Controlling the light intensity of the plurality of first light-emitting elements and the light intensity of the plurality of second light-emitting elements so that the average of the color coordinate values ​​of the plurality of light-emitting elements moves from one of the first color temperature region and the second color temperature region toward the other of the first color temperature region and the second color temperature region. Light-emitting device.

11. In Article 10, The above controller, Increasing the light intensity of the plurality of first light-emitting elements and decreasing the light intensity of the plurality of second light-emitting elements so that the average of the color coordinate values ​​of the plurality of light-emitting elements moves toward the first color temperature region. Light-emitting device.

12. In paragraph 10, The above controller, Reducing the light intensity of the plurality of first light-emitting elements and reducing the light intensity of the plurality of second light-emitting elements so that the average of the color coordinate values ​​of the plurality of light-emitting elements moves toward the second color temperature region. Light-emitting device.

13. In paragraph 10, The above controller, The average of the color coordinate values ​​of the plurality of light-emitting elements is arranged in one of the plurality of color temperature regions, and the light intensities of the plurality of first light-emitting elements and the light intensities of the plurality of second light-emitting elements are formed to be the same so that the average is arranged in the center of the first color temperature region and the second color temperature region. Light-emitting device.

14. In paragraph 9, The above plurality of color temperature areas have a rectangular shape on the color coordinate system and are arranged so that at least some of them are in contact with each other. Light-emitting device.

15. In paragraph 13, The size of the first color temperature region is larger than the size of the second color temperature region. Light-emitting device.

16. In paragraph 9, The above plurality of color temperature areas have an elliptical shape on the color coordinate system and are spaced apart from each other. Light-emitting device.

17. In paragraph 16, The above plurality of color temperature areas are arranged so as to be tilted at a predetermined angle with respect to the x-axis of the color coordinate system. Light-emitting device.

18. In paragraph 17, The angle at which the first color temperature region is tilted is different from the angle at which the second color temperature region is tilted. Light-emitting device.

19. A light-emitting device; and Including a controller that controls the light emitter so that Srms of the mathematical expression 1 below satisfies a range of 0.001 or more and 0.9 or less, [Mathematical formula 1] In the above mathematical expression 1, a is a wavelength selected within a range of 200 nm to less than 500 nm, b is a wavelength selected within a range of 500 nm to less than 900 nm, and L C (x k ) is the normalized radiant spectrum of the light emitted from the light emitter, and the ref c (x k ) is the normalized radiant spectrum of natural light, normalized from the natural light spectrum. Light-emitting device.

20. In paragraph 19, The above light emitter A first light-emitting element that generates light within a first color temperature region among a plurality of color temperature regions on a color coordinate system; and It includes a second light-emitting element that generates light within a second color temperature region different from the first color temperature region among a plurality of color temperature regions on a color coordinate system, In the above controller, Light intensity data for controlling the light intensity of the first light emitting element and the light intensity of the second light emitting element are stored in advance. Light-emitting device.

Images