Lighting devices and lamps including them

Abstract

The present invention provides lighting devices and lamps that can emit uniform linear light sources, surface light sources, and light across diverse wavelength ranges, while also improving design flexibility and aesthetics. [Solution] The lighting device according to the embodiment includes a substrate, a light-emitting element disposed on the substrate, a first reflective member disposed on the substrate, a resin layer disposed on the first reflective member, and a wavelength conversion layer disposed on the resin layer, wherein the resin layer includes a first resin layer, a second resin layer separated from the first resin layer, and a third resin layer disposed between the first and second resin layers, and the wavelength conversion layer includes a first wavelength conversion layer disposed on the first resin layer and a second wavelength conversion layer disposed on the second resin layer, wherein the height of the second resin layer is different from the height of the first resin layer, and the light-emitting element is disposed in a region that does not overlap the second and third resin layers in the vertical direction, but overlaps the first resin layer in the vertical direction.

Description

Technical Field

[0001] The embodiments relate to a lighting device and a lamp including the same.

Background Art

[0002] Lighting is used in various fields as a device that can supply light or adjust the amount of light. For example, lighting devices can be applied to various fields such as vehicles and buildings to brighten the interior or exterior.

[0003] Particularly recently, light-emitting elements are used as light sources for lighting. Such light-emitting elements, for example, light-emitting diodes (LEDs), have advantages such as low power consumption, semi-permanent life, fast response speed, safety, and environmental friendliness compared to existing light sources such as fluorescent lamps and incandescent lamps. Such light-emitting diodes are applied to various optical assemblies such as various display devices, indoor lights, or outdoor lights.

[0004] Generally, various colors and forms of lamps are applied to vehicles, and recently, lamps adopting light-emitting diodes as vehicle light sources have been proposed. As an example, light-emitting diodes are applied to vehicle headlights, tail lights, direction indicator lights, emblems, etc. However, such light-emitting diodes have a problem that the emission angle of the emitted light is relatively small. Thus, when using a light-emitting diode as a vehicle lamp, there is a requirement for an increase in the light-emitting area of the lamp.

[0005] In addition, when the lamp includes the light-emitting diode, there is a problem that a hot spot is formed by the light emitted from the light-emitting diode. In this case, when implementing a surface light source using the lamp, there is a problem that the uniformity characteristic of the light-emitting surface deteriorates.

[0006] Furthermore, when light-emitting diodes (LEDs) are generally applied to vehicle lamps, there is a problem in that the LEDs are visible from the outside. For example, when the vehicle lamp is on, the LEDs are not visible due to the light emitted from the light source, but when the lamp is off, the LEDs are visible from the outside, which reduces the aesthetic appeal and design freedom of the lamp.

[0007] Furthermore, the light-emitting diode can be used as a lamp for an emblem, logo, etc., located on the front or side / rear of a vehicle. In this case, the emblem or logo is visible from the outside due to the light emitted by the light-emitting diode. However, emblems or logos placed on the exterior of a vehicle have the problem of being placed in a limited space and making it difficult to realize a variety of colors. Also, if the size of the logo or emblem is increased in order to realize a variety of colors, there is a problem that it may interfere with radar, etc., located on the front or side / rear.

[0008] Therefore, a new lighting device and lamp that can solve the above-mentioned problems is required. [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] The embodiment aims to provide a lighting device and lamp having improved luminous intensity.

[0010] Furthermore, the embodiments aim to provide lighting devices and lamps that can realize uniform linear light sources and surface light sources.

[0011] Furthermore, the embodiment aims to provide a lighting device and lamp that can emit light in various wavelength bands by utilizing a light-emitting element that emits light in a single wavelength band.

[0012] Furthermore, the embodiments aim to provide lighting devices and lamps that can improve design flexibility and aesthetics. [Means for solving the problem]

[0013] The lighting device according to the embodiment includes a substrate, a light-emitting element disposed on the substrate, a first reflective member disposed on the substrate, a resin layer disposed on the first reflective member, and a wavelength conversion layer disposed on the resin layer, wherein the resin layer includes a first resin layer, a second resin layer separated from the first resin layer, and a third resin layer disposed between the first and second resin layers, and the wavelength conversion layer includes a first wavelength conversion layer disposed on the first resin layer and a second wavelength conversion layer disposed on the second resin layer, the height of the second resin layer being different from the height of the first resin layer, and the light-emitting element being disposed in a region that does not overlap the second and third resin layers perpendicularly but overlaps the first resin layer perpendicularly.

[0014] Furthermore, the height of the second resin layer may be lower than the height of the first resin layer.

[0015] Furthermore, the height of the third resin layer may include a region where the height increases from the first resin layer to the second resin layer.

[0016] Furthermore, the upper surface of the third resin layer may include at least one of a flat surface and a curved surface.

[0017] Furthermore, the system includes a first diffusion layer disposed between the first resin layer and the first wavelength conversion layer.

[0018] Furthermore, the second wavelength conversion layer may include at least one of a phosphor and a quantum dot that converts light to a different wavelength band than that of the first wavelength conversion layer.

[0019] The material also includes a second reflective member disposed on the outer surface of the resin layer, the second reflective member being disposed on at least one of the surfaces of the side of the first resin layer, the side of the second resin layer, and the upper surface of the third resin layer.

[0020] Furthermore, if the second reflective member is positioned on the side surface of the first resin layer, the second reflective member facing the upper surface of the third resin layer may include an open region that exposes a portion of the side surface of the first resin layer.

[0021] Furthermore, the system includes a sub-light-emitting element that is separated from the light-emitting element, and the sub-light-emitting element is positioned in a region that does not overlap perpendicularly with the second and third resin layers but overlaps perpendicularly with the first resin layer.

[0022] Furthermore, the light-emitting surface of the sub-light-emitting element may have a different orientation from the light-emitting surface of the light-emitting element. [Effects of the Invention]

[0023] The lighting device and lamp according to the embodiment can have improved optical characteristics. Specifically, since the lighting device and lamp include a light-emitting element, a reflective member, and a resin layer, the loss of light during the process of light emitted from the light-emitting element to the outside can be minimized. Therefore, the lighting device according to the embodiment can realize a uniform linear light source and a surface light source.

[0024] Furthermore, the lighting device and lamp according to the embodiment can embody a first region with relatively high brightness in the form of Hangul, alphabet, numbers, figures, characters, etc., and emit first light corresponding to the said form. In addition, the lighting device can emit second and third light in the second and third regions, which have lower brightness than the first region, with the brightness decreasing as the distance from the light-emitting element increases. As a result, the lighting device can emit light in various wavelength bands using a light-emitting element that emits light in a single wavelength band. Moreover, the brightness of the second and third light can be reduced in a gradation form, and the lighting device can have improved aesthetics.

[0025] In addition, the lighting device and the lamp according to the embodiment can emit light in various wavelength bands by using a light-emitting element with a single wavelength, and can be provided in a slim form with a simple structure. As a result, even when the lighting device is applied as a lamp in a limited area such as an emblem or a logo arranged outside the vehicle, interference with other components such as a radar can be prevented, and a higher degree of design freedom can be achieved.

Brief Description of the Drawings

[0026] [Figure 1] FIG. 1 is a cross-sectional view of a lighting device according to an embodiment. [Figure 2] FIG. 2 is a cross-sectional view of a lighting device according to an embodiment. [Figure 3] FIG. 3 is a top view of a reflecting member according to an embodiment. [Figure 4] FIG. 4 is a cross-sectional view for explaining a modified example of a first resin layer according to an embodiment. [Figure 5] FIG. 5 is a cross-sectional view for explaining a modified example of a first resin layer according to an embodiment. [Figure 6] FIG. 6 is another cross-sectional view of a lighting device according to an embodiment. [Figure 7] FIG. 7 is another cross-sectional view of a lighting device according to an embodiment. [Figure 8] FIG. 8 is another cross-sectional view of a lighting device according to an embodiment. [Figure 9] FIG. 9 is a drawing illustrating an example of a light emission pattern of the lighting device of FIGS. 1 to 8. [Figure 10] FIG. 10 is yet another cross-sectional view of a lighting device according to an embodiment. [Figure 11] FIG. 11 is a drawing illustrating an example of a light emission pattern of the lighting device of FIG. 10. [Figure 12] FIG. 12 is a drawing illustrating an example in which a lamp including a lighting device according to an embodiment is applied to a vehicle.

Modes for Carrying Out the Invention

[0027] Preferred embodiments of the invention will be described in detail below with reference to the attached drawings.

[0028] The technical concept of the present invention is not limited to the embodiments described, but can be embodied in a variety of forms, and within the scope of the technical concept of the present invention, components between embodiments can be selectively combined or substituted. Furthermore, unless explicitly specified, terms used in the embodiments of the present invention (including technical and scientific terms) shall be interpreted as having a meaning generally understood by a person with ordinary skill in the art to which the present invention belongs, and commonly used terms, such as those defined in dictionaries, may be interpreted considering their meaning in the context of the technology concerned. In addition, the terms used in the embodiments of the present invention are for the purpose of describing the embodiments and are not intended to limit the present invention. In this specification, singular forms may also include plural forms unless specifically limited in the description, and when it is written as "at least one (or more) of A and B, C", it may include one or more of all possible combinations of A, B, and C. Furthermore, terms such as 1st, 2nd, A, B, (a), (b), etc., may be used in the description of the components of the embodiments of the present invention. Such terms are for the purpose of distinguishing a component from other components, and the terms do not limit the nature or order of the component. Furthermore, when it is stated that one component is “connected,” “joined,” or “connected” to another component, this includes both cases where the component is directly connected or connected to the other component, and cases where other components are “connected,” “joined,” or “connected” between each component. Also, when it is stated that a component is formed or positioned “above or below” each component, “above or below” includes not only cases where two components are in direct contact, but also cases where one or more other components are formed or positioned between the two components. Moreover, when expressed as “above or below,” it can mean not only the upward direction but also the downward direction, with respect to one component.

[0029] The lighting device according to the invention can be applied to a variety of lamp devices requiring illumination, such as vehicle lamps, household optical assemblies, and industrial optical assemblies. For example, when applied to vehicle lamps, it can be applied to headlamps, side mirror lights, side maker lights, fog lamps, taillights, brake lights, daytime running lights, vehicle interior lighting, door scuffs, rear combination lamps, backup lamps, logo lamps, emblem lamps, etc. Also, when applied to vehicle lamps, it can be applied to rear-side assist systems (BSDs) located on side mirrors or A-pillars. Furthermore, the optical assemblies of the present invention can be applied to indoor and outdoor advertising devices, display devices, and various railway applications, and can also be applied to all lighting-related fields and advertising-related fields that are currently under development and commercialized, or that can be realized through future technological advancements.

[0030] Furthermore, before describing embodiments of the invention, the first direction may mean the x-axis direction as shown in the drawing, and the second direction may be a different direction from the first direction. For example, the second direction may mean the y-axis direction as shown in the drawing, perpendicular to the first direction. Also, the horizontal direction may mean the first and second directions, and the vertical direction may mean a direction perpendicular to at least one of the first and second directions. For example, the horizontal direction may mean the x-axis and y-axis direction in the drawing, and the vertical direction may be the z-axis direction in the drawing, perpendicular to the x-axis and y-axis direction.

[0031] Figures 1 and 2 are cross-sectional views of the lighting device according to the embodiment, and Figure 3 is a top view of the reflective member according to the embodiment.

[0032] Referring to Figures 1 to 3, the lighting device 1000 according to the embodiment may include a substrate 100, a light-emitting element 200, a first reflective member 300, a resin layer 400, and a wavelength conversion layer 600.

[0033] The lighting device 1000 can emit light from the light-emitting element 200 as a surface light source. The lighting device 1000 can be defined as a light-emitting cell, a lighting module, or a light source module. The lighting device 1000 may include one or more light-emitting cells on the substrate 100.

[0034] The substrate 100 may include a printed circuit board (PCB). The substrate 100 may include at least one of the following: a resin-based printed circuit board (PCB), a metal core PCB, a flexible PCB, a ceramic PCB, or an FR-4 substrate. If the substrate 100 is a metal core PCB with a metal layer at the bottom, the heat dissipation efficiency of the light-emitting element 200 can be improved. The substrate 100 may also include a light-transmitting material. Specifically, the substrate 100 may include a material that transmits light through its top and bottom surfaces. The substrate 100 may include at least one of the following: PET (Polyethylene terephthalate), PS (Polystyrene), PI (Polyimide), PEN (Polyethylene naphthalate), or PC (Polycarbonate).

[0035] The substrate 100 is electrically connected to the light-emitting element 200. The substrate 100 includes a wiring layer (not shown) on its upper surface, and the wiring layer is electrically connected to the light-emitting element 200. If multiple light-emitting elements 200 are arranged on the substrate 100, the multiple light-emitting elements 200 may be connected in series, in parallel, or in series-parallel by the wiring layer. The substrate 100 can function as a base member or support member positioned below the light-emitting elements 200 and the resin layer 400.

[0036] The light-emitting element 200 is placed on the substrate 100. The light-emitting element 200 may include a package in which a light-emitting chip is packaged as an element having a light-emitting diode (LED). The light-emitting chip can emit at least one of visible light such as blue, red, green, and yellow, ultraviolet (UV), and infrared light, and the light-emitting element 200 can emit at least one of visible light such as white, blue, red, yellow, and green, ultraviolet, and infrared light. The light-emitting element 200 may be a top-view type with its light-emitting surface facing upwards. That is, the optical axis of the light-emitting element 200 may be perpendicular to the top surface of the substrate 100.

[0037] Furthermore, the light-emitting element 200 may be arranged on the substrate 100 in a flip-chip configuration as an LED chip with at least five sides emitting light. Alternatively, the light-emitting element 200 may be a horizontal chip or a vertical chip. In the horizontal chip, two different electrodes are arranged horizontally, and in the vertical chip, two different electrodes are arranged vertically. In the case of the horizontal or vertical chip, the light-emitting element 200 is connected to other chips or wiring patterns by wires, so the thickness of the module increases due to the height of the wires, and pad space is required for bonding the wires.

[0038] The light-emitting element 200 is electrically connected to the substrate 100. For example, the light-emitting element 200 is electrically connected to the substrate 100 and to a pad (not shown) of the substrate 100 by a conductive bonding member (not shown). The conductive bonding member may be made of solder material or metal material.

[0039] The thickness of the light-emitting element 200 can be approximately 3 mm or less. More specifically, the thickness of the light-emitting element 200 can be approximately 0.1 mm to approximately 2.5 mm. Furthermore, the length of the light-emitting element 200 in the first direction may be different from or the same as the length in the second direction.

[0040] At least one of the light-emitting elements 200 is arranged on the substrate 100. For example, one or more of the light-emitting elements 200 may be arranged in a region that overlaps perpendicularly with the first resin layer 410, which will be described later. If there are multiple light-emitting elements 200, they can be separated in a first or second direction. Furthermore, the multiple light-emitting elements 200 can emit light in the same wavelength band.

[0041] The light-emitting element 200 may include an emitting surface (not shown) from which light is emitted. The emitting surface is positioned on the upper surface of the light-emitting element 200 as the surface from which the strongest light is emitted. Here, the upper surface of the light-emitting element 200 may be a surface facing the upper surface of the resin layer 400. That is, the light-emitting element 200 can emit light of the highest intensity in a third direction (vertical direction, z-axis direction). The emitting surface may be a vertical plane, a concave surface, or a convex surface. The light-emitting element 200 may also have a set directional angle. For example, the light-emitting element 200 may have a directional angle of approximately 100 degrees or more. More specifically, the directional angle of the light-emitting element 200 may be approximately 120 degrees to approximately 140 degrees.

[0042] The light emitted from the light-emitting element 200 can travel toward the upper surface of the resin layer 400. A portion of the emitted light is reflected by the first reflective member 300 and can travel toward the upper surface of the resin layer 400. Another portion of the emitted light is emitted to the outside of the resin layer 400 via its side surface.

[0043] The first reflective member 300 is placed on the substrate 100. More specifically, the first reflective member 300 is placed between the substrate 100 and the resin layer 400.

[0044] The first reflective member 300 may be provided in the form of a film made of a metallic or non-metallic material. The first reflective member 300 may be adhered to the upper surface of the substrate 100. The first reflective member 300 may have an area smaller than the upper surface area of ​​the substrate 100. The first reflective member 300 is separated from the edge of the substrate 100, and the resin layer 400 is attached to the substrate 100 in the separated area. This prevents the edge portion of the first reflective member 300 from peeling off.

[0045] The first reflective member 300 may include an opening 301 in which the lower part of the light-emitting element 200 is positioned. The opening 301 of the first reflective member 300 is positioned in which the upper surface of the substrate 100 is exposed and the lower part of the light-emitting element 200 is bonded. The size of the opening 301 may be the same as or larger than the size of the light-emitting element 200, but is not limited thereto. The first reflective member 300 may be in contact with the upper surface of the substrate 100 or bonded between the resin layer 400 and the substrate 100, but is not limited thereto. Here, the first reflective member 300 may be omitted if the upper surface of the substrate 100 is coated with a highly reflective material.

[0046] The first reflective member 300 may be formed with a thickness thinner than the thickness of the light-emitting element 200. The thickness of the first reflective member 300 can be in the range of 0.2 mm ± 0.02 mm. The lower part of the light-emitting element 200 can pass through the opening 301 of such a first reflective member 300, and the upper part of the light-emitting element 200 can protrude. The emission surface of the light-emitting element 200 is provided in a direction perpendicular to the upper surface of the first reflective member 300.

[0047] The first reflective member 300 may be made of a metallic or non-metallic material. The metallic material may be a metal such as aluminum, silver, or gold. The non-metallic material may be a plastic or resin material. The plastic material may be any one selected from the group consisting of polyethylene, polypropylene, polystyrene, polyvinyl chloride, polychlorinated biphenyl, polyethylene terephthalate, polyvinyl alcohol, polycarbonate, polybutylene terephthalate, polyethylene naphthalate, polyamide, polyacetal, polyphenylene ether, polyamide-imide, polyether-imide, polyether-ether-ketone, polyimide, polytetrafluoroethylene, liquid crystal polymer, fluororesin, copolymers thereof, and mixtures thereof. The resin material may have a reflective material, such as a metal oxide such as TiO2, Al2O3, or SiO2, added to silicone or epoxy. The first reflective member 300 may be embodied in a single layer or a multilayer structure, and such a layer structure can improve the light reflection efficiency. The first reflective member 300 according to the embodiment can increase the amount of light so that the light is emitted with a uniform distribution by reflecting the incident light.

[0048] The first reflective member 300 may include an adhesive layer (not shown), a reflective layer (not shown), and a plurality of dots 305.

[0049] The adhesive layer can adhere the first reflective member 300 to the upper surface of the substrate 100. The adhesive layer may be made of a transparent material such as a UV adhesive, silicone, or epoxy.

[0050] The reflective layer may contain a number of reflective agents (not shown) within the resin material. The reflective agents may be bubbles such as air, or a medium having the same refractive index as air. The resin material of the reflective layer may be a material such as silicone or epoxy, and the reflective agents may be formed by injecting bubbles into the resin material. The reflective layer can reflect or refract incident light in other directions with respect to the number of reflective agents. The thickness of the reflective layer may be 80% or more of the thickness of the first reflective member 300.

[0051] The plurality of dots 305 may be arranged in a manner that protrudes from the upper surface of the first reflective member 300. For example, the plurality of dots 305 may be arranged on the upper surface of the reflective layer in a manner that protrudes from the upper surface. The plurality of dots 305 are arranged at a distance from the light-emitting element 200 and surrounding the light-emitting element 200.

[0052] The plurality of dots 305 may be formed by printing on the reflective layer. The plurality of dots 305 may contain reflective ink. The plurality of dots 305 can be printed with a material containing one of the following: TiO2, CaCO3, BaSO4, Al2O3, Silicon, or PS. The planar shape of each of the plurality of dots 305 may be selected from circular, elliptical, or polygonal. Also, each of the plurality of dots 305 may have a hemispherical or polygonal side cross-section. The material of the plurality of dots 305 may be white.

[0053] The density of the dot pattern of the plurality of dots 305 may increase as it moves away from the light-emitting element 200. For example, the density of the dot pattern per unit area may increase as it moves horizontally away from the optical axis of the light-emitting element 200. Also, the size of the plurality of dots 305 may change as it moves away from the light-emitting element 200. For example, the horizontal width of the plurality of dots 305 may increase as it moves horizontally away from the optical axis of the light-emitting element 200.

[0054] In other words, by arranging the plurality of dots 305 on the path of light emitted from the light-emitting element 200 and / or light emitted from the light-emitting element 200 and reflected by other components, the light reflectivity can be improved, light loss can be reduced, and the brightness of the surface light source can be improved.

[0055] The resin layer 400 is placed on the substrate 100. The resin layer 400 can face the substrate 100. The resin layer 400 may be placed on the entire upper surface or a portion thereof of the substrate 100. The lower surface area of ​​the resin layer 400 may be the same as or larger than the upper surface area of ​​the substrate 100.

[0056] The resin layer 400 may be formed from a transparent material. The resin layer 400 may include a resin material such as silicone or epoxy. The resin layer 400 may include a thermosetting resin material, and may selectively include, for example, PC, OPS, PMMA, PVC, etc. The resin layer 400 may be formed from glass, but is not limited thereto. For example, the main material of the resin layer 400 can be a resin material mainly composed of urethane acrylate oligomer. For example, a mixture of a synthetic oligomer, such as urethane acrylate oligomer, with a polymer type such as polyacrylic can be used. Of course, monomers mixed with low-boiling point dilutable reactive monomers such as IBOA (isobornyl acrylate), HPA (Hydroxylpropyl acrylate), 2-HEA (2-hydroxyethyl acrylate), etc. can be further included, and photoinitiators (e.g., 1-hydroxycyclohexyl phenyl-ketone, etc.) or antioxidants can be added as additives.

[0057] The resin layer 400 can have a set refractive index. For example, the refractive index of the resin layer 400 can be approximately 1.4 to approximately 1.8. Since the resin layer 400 is provided as a layer that guides light with resin, it can be provided with a thinner thickness than in the case of glass and can be provided as a flexible plate. The resin layer 400 can emit the point light source emitted from the light-emitting element 200 in the form of a line light source or a surface light source.

[0058] The upper surface of the resin layer 400 can diffuse and emit light from the light-emitting element 200. For example, the resin layer 400 may contain beads (not shown), which can diffuse and reflect incident light to increase the amount of light. The beads may be arranged in an amount of 0.01 to 0.3% of the weight of the resin layer 400. The beads are composed of one of the following materials: silicone, silica, glass bubble, PMMA (polymethyl methacrylate), urethane, Zn, Zr, Al2O3, and acrylic. The particle size of the beads may be in the range of approximately 1 μm to approximately 20 μm, but is not limited thereto.

[0059] Since the resin layer 400 is placed on the light-emitting element 200, it can protect the light-emitting element 200 and reduce the loss of light emitted from the light-emitting element 200. The light-emitting element 200 may be embedded in the lower part of the resin layer 400.

[0060] The resin layer 400 can contact the surface of the light-emitting element 200 and can contact the emission surface of the light-emitting element 200. A portion of the resin layer 400 is positioned in the opening 301 of the first reflective member 300. A portion of the resin layer 400 can contact the upper surface of the substrate 100 through the opening 301 of the first reflective member 300. As a result, the first reflective member 300 can be fixed between the resin layer 400 and the substrate 100 by the contact of a portion of the resin layer 400 with the substrate 100.

[0061] The resin layer 400 may be formed with a thickness greater than the thickness of the light-emitting element 200. For example, the thickness of the resin layer 400 can be approximately 1 mm or more. More specifically, the thickness of the resin layer 400 can be approximately 1 mm to approximately 10 mm. If the thickness of the resin layer 400 is less than approximately 1 mm, it will not be able to effectively guide the light emitted from the light-emitting element 200. This makes it difficult for the uniform lighting device 1000 to embody a uniform surface light source. Also, if the thickness of the resin layer 400 is less than approximately 1 mm, it will be difficult to effectively protect the light-emitting element 200, and the adhesion between the substrate 100 and the first reflective member 300 will be reduced. Furthermore, if the thickness of the resin layer 400 exceeds approximately 10 mm, light loss will occur due to the increased light path of the light emitted from the light-emitting element 200, and the brightness of the surface light source will decrease. Therefore, it is preferable that the thickness of the resin layer 400 satisfies the above range.

[0062] Furthermore, the vertical height from the upper surface of the resin layer 400 to the upper surface of the light-emitting element 200 may be greater than the thickness of the light-emitting element 200. For example, the height from the upper surface of the resin layer 400 to the upper surface of the light-emitting element 200 can be approximately 3 to 15 times the thickness of the light-emitting element 200. It is preferable that the thickness of the resin layer 400 and the thickness of the light-emitting element 200 satisfy the above-mentioned range in order to effectively guide the point light source emitted from the light-emitting element 200 and emit it in the form of a line light source or a surface light source.

[0063] The resin layer 400 may include a plurality of resin layers. More specifically, the resin layer 400 may include a first resin layer 410, a second resin layer 420, and a third resin layer 430.

[0064] The first resin layer 410 is positioned in a region corresponding to the light-emitting element 200. More specifically, the first resin layer 410 is positioned in a region that overlaps perpendicularly with the light-emitting element 200.

[0065] The first resin layer 410 may have a set horizontal width. For example, the horizontal width of the first resin layer 410 may be provided to be greater than the horizontal width of the light-emitting element 200.

[0066] Furthermore, the first resin layer 410 may have a set height. The first resin layer 410 may have a constant height. The height of the first resin layer 410 may be greater than the height of the light-emitting element 200. In this way, the first resin layer 410 is positioned to cover the light-emitting element 200.

[0067] The second resin layer 420 can be separated from the first resin layer 410. For example, the second resin layer 420 can be separated from the first resin layer 410 in the horizontal direction. The second resin layer 420 may contain the same material as the first resin layer 410.

[0068] The second resin layer 420 can be separated from the light-emitting element 200. More specifically, the second resin layer 420 can be separated from the light-emitting element 200 in the horizontal direction without overlapping in the vertical direction.

[0069] The second resin layer 420 may have a set height. The second resin layer 420 may have a constant height. More specifically, the second resin layer 420 may have a different height from the first resin layer 410. For example, the height h2 of the second resin layer 420 may be lower than the height of the first resin layer 410. The height h2 of the second resin layer 420 may be approximately 80% or less of the height of the first resin layer 410. If the height h2 of the second resin layer 420 exceeds approximately 80% of the height of the first resin layer 410, the travel path of light emitted from the light-emitting element 200 increases, making it less likely for light to be emitted to the upper surface of the second resin layer 420. Therefore, it is preferable that the height h2 of the second resin layer 420 satisfies the above range.

[0070] The third resin layer 430 is positioned between the first resin layer 410 and the second resin layer 420. The third resin layer 430 may contain the same material as the first resin layer 410. Furthermore, the third resin layer 430 may contain the same material as the second resin layer 420.

[0071] The third resin layer 430 can be separated from the light-emitting element 200. More specifically, the third resin layer 430 can be separated from the light-emitting element 200 in the horizontal direction without overlapping in the vertical direction.

[0072] The third resin layer 430 can physically connect the first resin layer 410 and the second resin layer 420. That is, the first resin layer 410, the second resin layer 420, and the third resin layer 430 may be integrally formed.

[0073] The third resin layer 430 may have a set height. Specifically, the height of the third resin layer 430 may increase from the first resin layer 410 to the second resin layer 420. As a result, the distance between the upper surface 431 and the lower surface of the third resin layer 430 may increase from the first resin layer 410 to the second resin layer 420. The upper surface 431 of the third resin layer 430 may be flat. The upper surface 431 of the third resin layer 430 may be inclined with respect to the lower surface of the third resin layer 430. For example, the inclination angle formed by the upper surface and the lower surface of the third resin layer 430 may be approximately 20 degrees to approximately 70 degrees.

[0074] The third resin layer 430 may have a first height h1 in the region connected to the first resin layer 410, and a second height h2 in the region connected to the second resin layer 420. Here, the first height h1 may be the minimum height of the third resin layer 430, and the second height h2 may be the maximum height of the third resin layer 430. The second height h2 may also correspond to the height of the second resin layer 420.

[0075] Furthermore, the first height h1 may vary depending on the refractive index of the resin layer 400 and the directional angle of the light-emitting element 200. For example, the first height h1 can satisfy the following formula 1. Formula 1

[0076] In the above formula 1, θ represents the directional angle of the light-emitting element 200, and d1 represents the distance from the optical axis of the light-emitting element 200 to the third resin layer 430. Also, in the above formula 1, Na represents the refractive index of air as the refractive index of the medium located outside the lighting device 1000, and Nr represents the refractive index of the resin layer 400.

[0077] That is, the third resin layer 430 can have a first height h1 that satisfies the above-described range in the region in contact with the first resin layer 410. As a result, the light emitted from the light-emitting element 200 is provided to the first resin layer 410, the second resin layer 420, and the third resin layer 430 and emitted to the outside.

[0078] The wavelength conversion layer 600 is disposed on the resin layer 400. The wavelength conversion layer 600 may include multiple layers.

[0079] For example, the wavelength conversion layer 600 may include a first wavelength conversion layer 610 disposed on the first resin layer 410. The first wavelength conversion layer 610 is disposed in a region corresponding to the first resin layer 410 and the light-emitting element 200.

[0080] The first wavelength conversion layer 610 may include a wavelength conversion material. For example, the first wavelength conversion layer 610 may include at least one wavelength conversion material selected from phosphors and quantum dots. As an example, the first wavelength conversion layer 610 may include a phosphor and emit light such as white, blue, yellow, green, or red. The phosphor may include at least one or two types selected from green phosphors, red phosphors, amber phosphors, yellow phosphors, white phosphors, and blue phosphors. The phosphor may include at least one of YAG, TAG, silicon, sulfide, or nitride.

[0081] The first wavelength conversion layer 610 can absorb light emitted from the light-emitting element 200 and convert the light into first light L1 in the first wavelength band. More specifically, the first wavelength conversion layer 610 can absorb light that has been incident on the light emitted from the light-emitting element 200 through the first resin layer 410 and convert it into first light L1. In addition, the first wavelength conversion layer 610 can absorb light that has been reflected by the first reflective member 300 from the light emitted from the light-emitting element 200 and convert it into first light L1.

[0082] Furthermore, the wavelength conversion layer 600 may include a second wavelength conversion layer 620 disposed on top of the second resin layer 420.

[0083] The second wavelength conversion layer 620 may contain a wavelength conversion material. For example, the second wavelength conversion layer 620 may contain at least one wavelength conversion material from phosphors and quantum dots. As an example, the second wavelength conversion layer 620 may contain a phosphor and emit light of the following colors: white, blue, yellow, green, red, etc. The phosphor may contain at least one or two types from green phosphors, red phosphors, amber phosphors, yellow phosphors, white phosphors, and blue phosphors. The phosphor may contain at least one from YAG, TAG, silicon, sulfide, or nitride. The second wavelength conversion layer 620 may contain a different material from that of the first wavelength conversion layer 610. The second wavelength conversion layer 620 may contain a material that converts to light in a different wavelength band than that of the first wavelength conversion layer 610.

[0084] The second wavelength conversion layer 620 can absorb light emitted from the light-emitting element 200 and convert the light into a second light L2 in the second wavelength band. More specifically, the second wavelength conversion layer 620 can absorb light that has been incident on the light emitted from the light-emitting element 200 through the third resin layer 430 and the second resin layer 420 and convert it into the second light L2. Furthermore, the second wavelength conversion layer 620 can absorb light reflected by the first reflective member 300 located in a region corresponding to the third resin layer 430 and the second resin layer 420 and convert it into the second light L2. Here, the second light L2 in the second wavelength band may be a different color from the first light L1 in the first wavelength band.

[0085] The lighting device 1000 may further include a first diffusion layer 510. The first diffusion layer 510 is positioned between the first resin layer 410 and the first wavelength conversion layer 610. The first diffusion layer 510 can uniformly diffuse the light emitted after passing through the first resin layer 410. Furthermore, the first diffusion layer 510 can diffuse and mix light when the luminous intensity of the light is high, as this would prevent the mixing of specific colors.

[0086] The first diffusion layer 510 may include beads (not shown). The beads can increase the amount of light by diffusing and reflecting incident light. The beads are composed of one of the following materials: silicone, silica, glass bubble, PMMA (polymethyl methacrylate), urethane, Zn, Zr, Al2O3, and acrylic. The particle size of the beads may be in the range of approximately 1 μm to approximately 20 μm, but is not limited thereto.

[0087] The lighting device 1000 according to the embodiment may include multiple regions. For example, the lighting device 1000 may include a first region R1 corresponding to the first resin layer 410, a second region R2 corresponding to the second resin layer 420, and a third region R3 corresponding to the third resin layer 430.

[0088] The lighting device 1000 can emit light of various wavelength bands depending on the region. For example, in the first region R1, the first wavelength conversion layer 610 can emit the first light L1, and in the second region R2, the second wavelength conversion layer 620 can emit the second light L2. Here, the first light L1 and the second light L2 may be light of different wavelength bands than the light emitted from the light-emitting element 200.

[0089] Furthermore, in the third region R3, a third light L3 different from the first light L1 and the second light L2, for example, light in the same wavelength band as the light emitted from the light-emitting element 200, can be emitted. Specifically, by satisfying the above-described range when the first height h1 of the third resin layer 430 is first observed, a portion of the light emitted from the light-emitting element 200 is emitted to the outside via the side surface 411 of the first resin layer 410 facing the upper surface 431 of the third resin layer 430. At this time, the light emitted via the side surface 411 of the first resin layer 410 can be defined as the third light L3, and a portion of the third light L3 is reflected by the upper surface 431 of the third resin layer 430.

[0090] In this case, the reflective member 300, which is positioned in the region corresponding to the second region R2 and the third region R3, may include a plurality of dots 305. In this case, the density of the pattern of the plurality of dots 305 may increase as it moves away from the first resin layer 410. Also, the size of the plurality of dots 305 may increase as it moves away from the first resin layer 410. As a result, the lighting device 1000 according to the embodiment can effectively provide light to the second resin layer 420 and the third resin layer 430 using only the light-emitting element 200 positioned in the first region R1, and can emit light of various colors to the outside.

[0091] As a result, the lighting device 1000 according to the embodiment can emit light in various wavelength bands by arranging light-emitting elements 200 that emit light in a set wavelength band in a single region (first region R1). Furthermore, the lighting device 1000 can adjust the brightness of the light emitted from the second region R2 and the third region R3 by adjusting the width and / or height of the second resin layer 420 and the third resin layer 430.

[0092] For example, the first region R1, which has a higher brightness than the light emitted from the second region R2 and the third region R3, can be embodied in a form such as Hangul, alphabet, numbers, figures, characters, etc., and a first light L1 corresponding to the form can be emitted. Furthermore, the second region R2 and the third region R3 can emit second light L2 and third light L3, respectively, in which the brightness decreases in a gradation pattern as they move away from the light-emitting element 200, thereby improving the aesthetic appeal of the lighting device 1000.

[0093] Figures 4 and 5 are cross-sectional views illustrating modified examples of the first resin layer according to the embodiment. In the explanation using Figures 4 and 5, the explanation of components identical or similar to those of the lighting device described above will be omitted, and identical or similar components will be assigned the same reference numerals.

[0094] First, referring to Figure 4, the upper surface of the first resin layer 410 may have a shape that protrudes upward. The upper surface of the first resin layer 410 may have at least one inclined surface, and the inclined surface may have a planar or curved shape. As an example, the upper surface of the first resin layer 410 may have an inverted "V" shape as shown in Figure 4.

[0095] In this case, the inclination angle formed by the upper surface of the first resin layer 410 can be approximately 120 degrees to approximately 170 degrees. If the inclination angle is less than approximately 120 degrees, the first light L1 is mixed not only with the third light L3 emitted from the adjacent region but also with the second light L2. Therefore, the degree to which the third light L3 and the second light L2 are visible from the outside is weakened. Also, if the inclination angle exceeds approximately 170 degrees, the effect of controlling the direction of light emission is weakened compared to the configuration in which the first resin layer 410 is the upper surface.

[0096] Furthermore, a first diffusion layer 510 and a first wavelength conversion layer 610 are arranged on the upper surface of the first resin layer 410. In this case, the first diffusion layer 510 and the first wavelength conversion layer 610 may have shapes corresponding to the upper surface of the first resin layer 410. That is, the cross-sections of the first diffusion layer 510 and the first wavelength conversion layer 610 may have an inverted "V" shape with an inclination angle corresponding to the upper surface of the first resin layer 410.

[0097] As a result, the first resin layer 410 can emit the point light emitted from the light-emitting element 200 in the form of a line light source or a surface light source. Furthermore, because the upper surface of the first resin layer 410 has the shape of protrusion described above, it can emit light at a wider angle compared to the first resin layer 410 described above (Figures 1 to 3). In addition, the first diffusion layer 510 can uniformly diffuse the light emitted through the upper surface of the first resin layer 410, and the first wavelength conversion layer 610 can convert the incident light into the first light L1 and emit the first light L1 at a wider angle.

[0098] Therefore, the lighting device 1000 according to the embodiment can emit light by partially mixing a portion of the first light L1 with the third light L3 emitted from a region adjacent to the first light L1. As a result, the embodiment can realize a wider variety of colors by utilizing the light-emitting element 200 having a set wavelength band.

[0099] Referring to Figure 5, the lighting device 1000 may further include a first sub-resin layer 415 and a second diffusion layer 520.

[0100] The first sub-resin layer 415 is placed on top of the first resin layer 410. More specifically, the first sub-resin layer 415 is placed between the first diffusion layer 510 and the first wavelength conversion layer 610.

[0101] The first sub-resin layer 415 may be formed of a transparent material. The first sub-resin layer 415 may include a resin material such as silicone or epoxy. The first sub-resin layer 415 may include a thermosetting resin material, and may selectively include, for example, PC, OPS, PMMA, PVC, etc. The first sub-resin layer 415 may be formed of glass, but is not limited thereto. For example, the main material of the first sub-resin layer 415 can be a resin material mainly composed of urethane acrylate oligomer. For example, a mixture of a synthetic oligomer, such as urethane acrylate oligomer, with a polymer type such as polyacrylic can be used. Of course, monomers mixed with low-boiling point dilutable reactive monomers such as IBOA (isobornyl acrylate), HPA (Hydroxylpropyl acrylate, 2-HEA (2-hydroxyethyl acrylate), etc. can be further included, and photoinitiators (e.g., 1-hydroxycyclohexyl phenyl-ketone, etc.) or antioxidants can be added as additives.

[0102] The first sub-resin layer 415 may have a smaller height than the first resin layer 410. For example, the height of the first sub-resin layer 415 may be approximately 1 / 30 to approximately 3 / 4 of the height of the first resin layer 410. In particular, it is preferable that the first sub-resin layer 415 satisfies the above range in order to secure the optical guide distance between the first diffusion layer 510 and the second diffusion layer 520, which will be described later.

[0103] The first sub-resin layer 415 can have a set refractive index. For example, the refractive index of the first sub-resin layer 415 can be approximately 1.4 to approximately 1.8. Since the first sub-resin layer 415 is provided as a layer that guides light with resin, it can be provided with a thinner thickness than in the case of glass and can be provided as a flexible plate. The first sub-resin layer 415 can guide the light emitted from the first diffusion layer 510.

[0104] The second diffusion layer 520 is placed on top of the first sub-resin layer 415. For example, the second diffusion layer 520 is placed between the first sub-resin layer 415 and the first wavelength conversion layer 610. The second diffusion layer 520 can diffuse the light emitted after passing through the first sub-resin layer 415.

[0105] The second diffusion layer 520 may include beads (not shown). The beads can increase the amount of light by diffusing and reflecting incident light. The beads are composed of one of the following materials: silicone, silica, glass bubble, PMMA (polymethyl methacrylate), urethane, Zn, Zr, Al2O3, and acrylic. The particle size of the beads may be in the range of approximately 1 μm to approximately 20 μm, but is not limited thereto.

[0106] As a result, the light emitted from the lighting device 1000 according to the embodiment can have a three-dimensional appearance. Specifically, the first diffusion layer 510 and the second diffusion layer 520 are separated by the first sub-resin layer 415 at a predetermined interval. As a result, when the light emitted from the lighting device 1000 is viewed from the outside, the emitted light appears as multiple layers depending on the viewing angle. Therefore, the lighting device 1000 according to the embodiment can emit light that has a three-dimensional appearance and improved aesthetics.

[0107] Figures 6 to 8 are other cross-sectional views of the lighting device according to the embodiment. In the explanation using Figures 6 to 8, the explanation of components identical or similar to those of the lighting device described above will be omitted, and the same reference numerals will be assigned to identical or similar components.

[0108] First, referring to Figure 6, the third resin layer 430 can have a set height. The height of the third resin layer 430 may increase from the first resin layer 410 to the second resin layer 420. As a result, the gap between the upper surface 431 and the lower surface of the third resin layer 430 increases from the first resin layer 410 to the second resin layer 420.

[0109] That is, the third resin layer 430 may have a first height h1 in the region connected to the first resin layer 410, and a second height h2 in the region connected to the second resin layer 420. Here, the first height h1 may be the minimum height of the third resin layer 430, and the second height h2 may be the maximum height of the third resin layer 430. Also, the second height h2 may correspond to the height of the second resin layer 420.

[0110] The upper surface 431 of the third resin layer 430 may be a curved surface. For example, the upper surface 431 of the third resin layer 430 may have a shape that is recessed downward from the upper surface 431 of the third resin layer 430.

[0111] Furthermore, although not shown in the drawings, the upper surface 431 of the third resin layer 430 may have a shape that bulges upward from the lower surface of the third resin layer 430. Also, although not shown in the drawings, the upper surface 431 of the third resin layer 430 may have a mixture of planar and curved surfaces. For example, the upper surface of the third resin layer 430 may be planar from the side surface 411 of the first resin layer 410 to a first point (not shown), and curved from the first point to the second resin layer 420. Here, the first point is set according to the beam angle of the light-emitting element 200. As an example, if the beam angle of the light-emitting element 200 is approximately 120 degrees to approximately 140 degrees, the first point can be located in a region that satisfies approximately 40% to approximately 60% of the distance between the first resin layer 410 and the second resin layer 420.

[0112] In other words, the lighting device 1000 according to the embodiment can control the brightness of the emitted third light L3 by controlling the shape of the upper surface 431 of the third resin layer 430.

[0113] Referring to Figure 7, a sub-light-emitting element 210 is further arranged on the substrate 100. The sub-light-emitting element 210 is electrically connected to the substrate 100 and is arranged in a region corresponding to the first resin layer 410. More specifically, one or more sub-light-emitting elements 210 may be arranged in a region that overlaps vertically with the first resin layer 410. That is, the sub-light-emitting elements 210 do not overlap vertically with the second and third resin layers 420 and 430, are arranged within the first resin layer 410, and can be horizontally separated from the light-emitting element 200.

[0114] The sub-light-emitting element 210 may include a package in which a light-emitting chip is packaged as an element having a light-emitting diode (LED). The light-emitting chip can emit at least one of visible light such as blue, red, green, and yellow, ultraviolet (UV), and infrared light, and the light-emitting element 200 can emit at least one of visible light such as white, blue, red, yellow, and green, ultraviolet, and infrared light. Specifically, the sub-light-emitting element 210 can emit light in the same wavelength band as the light-emitting element 200.

[0115] The sub-light-emitting element 210 may be of a different type from the light-emitting element 200. For example, the sub-light-emitting element 210 may have a different orientation of its light-emitting surface than the light-emitting element 200. The sub-light-emitting element 210 may be a side-view type with its light-emitting surface facing the side. Specifically, the sub-light-emitting element 210 is arranged so that its light-emitting surface faces the second resin layer 420 and the third resin layer 430. The optical axis of the sub-light-emitting element 210 can be parallel to the upper surface of the substrate 100.

[0116] The sub-light-emitting element 210 may be positioned adjacent to the third resin layer 430 more closely than the light-emitting element 200. This allows the sub-light-emitting element 210 to emit light in the direction of the second resin layer 420 and the third resin layer 430, selectively increasing the brightness of the light emitted in the second region R2 and the third region R3. For example, the lighting device 1000 according to the embodiment can emit a first light L1 with relatively high brightness using only the light-emitting element 200, and emit second and third lights L2 and L3 with relatively low brightness. Furthermore, the lighting device 1000 can selectively increase the brightness of the second and third lights L2 and L3, which have relatively low brightness, by using the light-emitting element 200 and the sub-light-emitting element 210. Therefore, the lighting device 1000 according to the embodiment can emit light of various colors using a single-wavelength light-emitting element, control the brightness of the emitted light, and have improved aesthetics.

[0117] Referring to Figure 8, the lighting device 1000 may further include a second reflective member 320. The second reflective member 320 is positioned on the resin layer 400. For example, the second reflective member 320 is positioned on the outer surface of the resin layer 400.

[0118] The second reflective member 320 may be provided in the form of a film made of a metallic or non-metallic material. Alternatively, the second reflective member 320 may be provided by being deposited onto the outer surface of the resin layer 400.

[0119] The second reflective member 320 may be made of a metallic or non-metallic material. The metallic material may be a metal such as aluminum, silver, or gold. The non-metallic material may be a plastic or resin material. The plastic material may be any one selected from the group consisting of polyethylene, polypropylene, polystyrene, polyvinyl chloride, polychlorinated biphenyl, polyethylene terephthalate, polyvinyl alcohol, polycarbonate, polybutylene terephthalate, polyethylene naphthalate, polyamide, polyacetal, polyphenylene ether, polyamide-imide, polyether-imide, polyether-ether-ketone, polyimide, polytetrafluoroethylene, liquid crystal polymer, fluororesin, copolymers thereof, and mixtures thereof. The resin material may have a reflective material, such as a metal oxide such as TiO2, Al2O3, or SiO2, added to silicone or epoxy. The second reflective member 320 may be embodied in a single layer or a multilayer structure, and such a layer structure can improve the light reflection efficiency. The second reflective member 320 according to the embodiment can increase the amount of light so that the light is emitted with a uniform distribution by reflecting the light incident into the resin layer 400.

[0120] The second reflective member 320 is positioned on at least one of the following surfaces: the side surface 411 of the first resin layer 410, the side surface of the second resin layer 420, and the upper surface 431 of the third resin layer 430.

[0121] For example, the second reflective member 320 is positioned on the side surface of the second resin layer 420. In this case, the second reflective member 320 is positioned over the entire side surface area of ​​the second resin layer 420. Therefore, it is possible to prevent light incident on the second resin layer 420 from being emitted to the outside through the side surface of the second resin layer 420, and to effectively guide the light to the second wavelength conversion layer 620.

[0122] Furthermore, the second reflective member 320 is positioned on the upper surface 431 of the third resin layer 430. In this case, the second reflective member 320 is positioned over the entire upper surface 431 of the third resin layer 430. Therefore, it is possible to prevent light incident on the second resin layer 420 from being emitted to the outside through the upper surface 431 of the third resin layer 430, and to effectively guide the light to the second resin layer 420.

[0123] Furthermore, the second reflective member 320 is positioned on the side surface 411 of the first resin layer 410. For example, the first resin layer 410 may include one side surface facing the third resin layer 430 and the remaining sides other than the one side surface. In this case, the second reflective member 320 is positioned on the entire area of ​​the remaining side surface and on a portion of the area of ​​the one side surface.

[0124] That is, the second reflective member 320 is partially positioned on one side surface of the first resin layer 410 facing the third resin layer 430. More specifically, the second reflective member 320 may include an open region O1 that exposes a portion of one side surface of the first resin layer 410. The open region O1 may be an open region where the second reflective member 320 is not positioned, and the third light L3 described above is emitted through the side surface 411 of the first resin layer 410.

[0125] The open region O1 may be positioned adjacent to the upper surface 431 of the third resin layer 430. The open region O1 may also have a predetermined height (in the z-axis direction) from the connection point of the first resin layer 410 and the third resin layer 430. For example, the height of the open region O1 may be greater than or the same as the first height h1, and less than the second height h2. If the height of the open region O1 does not satisfy the above range, it becomes difficult to control the brightness of the light emitted through the side surface of the first resin layer 410. For example, if the height of the open region O1 is less than the first height h1, the brightness value of the first light L1 increases, but the amount of the third light L3 emitted through the open region O1 decreases significantly. Also, if the height of the open region O1 is greater than the second height h2, the effect of the second reflective member 320 in controlling the brightness of the third light L3 becomes weaker. Therefore, it is preferable that the second reflective member 320 positioned on the side surface of the first resin layer 410 includes an open region O1 of the above height.

[0126] Preferably, the second reflective member 320 may be arranged on all sides of the first resin layer 410, the second resin layer 420, and the upper surface of the third resin layer 430, as shown in Figure 8. This minimizes light loss in the first region R1 and the second region R2, effectively emitting the first light L1 and the second light L2 upwards, and efficiently controlling the brightness of the third light L3.

[0127] Figure 9 is a diagram illustrating an example of the light emission pattern of the lighting device shown in Figures 1 to 8. More specifically, Figure 9 is a diagram illustrating an example of the light emission pattern when the lighting device is viewed from above (top view), and the section A-A' in Figure 9 may be the lighting device shown in Figures 1 to 8.

[0128] Referring to Figure 9, the lighting device 1000 according to the embodiment may be provided in various forms. Specifically, when viewed from above, the lighting device 1000 can have various forms such as figures, characters, emoticons, etc. As an example, the lighting device 1000 can have an "L" shape and can emit light of various wavelength bands in an "L" shape.

[0129] More specifically, the lighting device 1000 may include a first region R1, a second region R2, and a third region R3, which are demarcated by the first resin layer 410, the second resin layer 420, and the third resin layer 430. In this case, the first to third regions R1, R2, and R3 can emit light in different wavelength bands. For example, the first region R1 emits first light L1, the second region R2 emits second light L2, and the third region R3 emits third light L3.

[0130] In other words, the lighting device 1000 according to the embodiment can emit light in various wavelength bands by utilizing one or more light-emitting elements 200 that emit light in a single wavelength band. Furthermore, the brightness of the emitted light of various colors can be controlled by controlling the shape of the resin layer 400. Therefore, the lighting device 1000 has a simple structure, can be provided in a slim form, and can have improved aesthetics.

[0131] Figure 10 is yet another cross-sectional view of the lighting device according to the embodiment, and Figure 11 is a drawing illustrating an example of the light emission pattern of the lighting device in Figure 10. More specifically, Figure 11 is a drawing illustrating an example of the light emission pattern when the lighting device according to Figure 10 is viewed from above (top view), and the B-B' cross section in Figure 11 may be the lighting device according to Figure 10.

[0132] In the explanation using Figures 10 and 11, explanations of configurations identical or similar to those of the lighting device described above will be omitted, and identical or similar configurations will be assigned the same reference numerals.

[0133] Referring to Figure 10, the resin layer 400 may include multiple resin layers. More specifically, the resin layer 400 may include not only the first resin layer 410, the second resin layer 420, and the third resin layer 430, but also the fourth resin layer 440 and the fifth resin layer 450.

[0134] The fourth resin layer 440 can be separated from the second resin layer 420. For example, the fourth resin layer 440 can be separated from the second resin layer 420 in the horizontal direction. The fourth resin layer 440 may contain the same material as the first to third resin layers 410, 420, and 430.

[0135] The fourth resin layer 440 may have a set height. The fourth resin layer 440 may have a constant height. The fourth resin layer 440 may have the same height as the first resin layer 410, and may be taller than the height of the second resin layer 420. The fourth resin layer 440 may have a shape, height, and width corresponding to the first resin layer 410.

[0136] The fifth resin layer 450 is positioned between the second resin layer 420 and the fourth resin layer 440. The fifth resin layer 450 may contain the same material as the first to fourth resin layers 410, 420, 430, and 440. The fifth resin layer 450 can physically connect the second resin layer 420 and the fourth resin layer 440. That is, the first to fifth resin layers 410, 420, 430, 440, and 450 may be integrally formed.

[0137] The fifth resin layer 450 may have a set height. Specifically, the height of the fifth resin layer 450 may increase from the fourth resin layer 440 to the second resin layer 420. As a result, the distance between the upper surface 451 and the lower surface of the fifth resin layer 450 may increase from the fourth resin layer 440 to the second resin layer 420. The upper surface 451 of the fifth resin layer 450 may be flat. The upper surface 451 of the third resin layer 430 may be positioned to be inclined with respect to the lower surface of the fifth resin layer 450. For example, the inclination angle formed by the upper surface 451 and the lower surface of the fifth resin layer 450 may be approximately 20 degrees to approximately 70 degrees.

[0138] Furthermore, although not shown in the drawings, the upper surface 451 of the fifth resin layer 450 may be a curved surface. For example, the upper surface 451 of the fifth resin layer 450 may have a shape that is recessed downwards from the upper surface 451 of the fifth resin layer 450, or conversely, a shape that is convex upwards from the lower surface of the fifth resin layer 450. Also, the upper surface 451 of the fifth resin layer 450 may have a shape that is a mixture of flat and curved surfaces. The fifth resin layer 450 may have a shape, height, and width that correspond to the third resin layer 430.

[0139] The lighting device 1000 may include a plurality of light-emitting elements 200. For example, the light-emitting elements 200 may include a first light-emitting element 200A positioned in a region that overlaps perpendicularly with the first resin layer 410. The first light-emitting element 200A is positioned within the first resin layer 410 and sealed by the first resin layer 410. The light-emitting element 200 may also include a second light-emitting element 200B positioned in a region that overlaps perpendicularly with the fourth resin layer 440. The second light-emitting element 200B is positioned within the fourth resin layer 440 and sealed by the fourth resin layer 440.

[0140] Each of the first light-emitting element 200A and the second light-emitting element 200B may be a top-view type with its light-emitting surface facing upwards, and can emit light of the highest intensity onto the upper surfaces of the first resin layer 410 and the fourth resin layer 440, respectively.

[0141] Each of the first light-emitting element 200A and the second light-emitting element 200B may be provided as one or more units. Furthermore, the first light-emitting element 200A and the second light-emitting element 200B can emit light in the same wavelength band.

[0142] The lighting device 1000 may include a third wavelength conversion layer 630. The third wavelength conversion layer 630 is disposed on top of the fourth resin layer 440.

[0143] The third wavelength conversion layer 630 may contain a wavelength conversion material. For example, the third wavelength conversion layer 630 may contain at least one wavelength conversion material from phosphors and quantum dots. As an example, the third wavelength conversion layer 630 may contain a phosphor and emit light of the following colors: white, blue, yellow, green, red, etc. The phosphor may contain at least one or two types from green phosphors, red phosphors, amber phosphors, yellow phosphors, white phosphors, and blue phosphors. The phosphor may contain at least one from YAG, TAG, silicon, sulfide, or nitride. The third wavelength conversion layer 630 may contain the same material as the first wavelength conversion layer 610 and a different material from the second wavelength conversion layer 620. The third wavelength conversion layer 630 may contain a material that converts to light in the same wavelength band as the first wavelength conversion layer 610.

[0144] The third wavelength conversion layer 630 can absorb light emitted from the second light-emitting element 200B and convert the light into the first light L1 in the first wavelength band. More specifically, the third wavelength conversion layer 630 can absorb light incident through the fourth resin layer 440 and convert it into the first light L1. Furthermore, the third wavelength conversion layer 630 can absorb light that has been reflected by the first reflective member 300 from the light emitted from the first light-emitting element 200A and the second light-emitting element 200B and convert it into the first light L1.

[0145] The lighting device 1000 may further include a third diffusion layer 530. The third diffusion layer 530 is positioned between the fourth resin layer 440 and the third wavelength conversion layer 630. The third diffusion layer 530 can uniformly diffuse the light emitted after passing through the fourth resin layer 440. Furthermore, the third diffusion layer 530 can diffuse and mix the light when the luminous intensity of the light is high, as this would prevent the mixing of specific colors.

[0146] The third diffusion layer 530 may include beads (not shown). The beads can increase the amount of light by diffusing and reflecting incident light. The beads are composed of one of the following materials: silicone, silica, glass bubble, PMMA (polymethyl methacrylate), urethane, Zn, Zr, Al2O3, and acrylic. The particle size of the beads may be in the range of approximately 1 μm to approximately 20 μm, but is not limited thereto.

[0147] The lighting device 1000 may include multiple regions. For example, the lighting device 1000 may include a first region R1 corresponding to the first resin layer 410, a second region R2 corresponding to the second resin layer 420, and a third region R3 corresponding to the third resin layer 430. The lighting device 1000 may also include a fourth region R4 corresponding to the fourth resin layer 440 and a fifth region R5 corresponding to the fifth resin layer 450.

[0148] The lighting device 1000 can emit light of various wavelength bands depending on the region. For example, in the first region R1, the first wavelength conversion layer 610 can emit the first light L1, and in the second region R2, the second wavelength conversion layer 620 can emit the second light L2.

[0149] Furthermore, the third region R3 can emit a third light L3 that is different from the first light L1 and the second light L2. Specifically, the third light L3 emitted through the side surface 411 of the first resin layer 410 is emitted in the third region R3.

[0150] Furthermore, in the fourth region R4, the first light L1 can be emitted by the third wavelength conversion layer 630, and in the fifth region R5, the third light L3 can be emitted. Specifically, in the fifth region R5, the third light L3 emitted through the side surface 441 of the fourth resin layer 440 is emitted.

[0151] Here, the first light L1 and the second light L2 may be light in a different wavelength band than the light emitted from the light-emitting element 200, and the third light L3 may be light in the same wavelength band as the light emitted from the first light-emitting element 200A and the second light-emitting element 200B.

[0152] Furthermore, the brightness of the light emitted from the second region R2, the third region R3, and the fifth region R5 may be lower than that of the first region R1 and the fourth region R4. In addition, the second light L2 and the third light L3 emitted from the second region R2, the third region R3, and the fifth region R5 can emit light whose brightness decreases in a gradation pattern as it moves away from the first and second light-emitting elements 200A and 200B.

[0153] Furthermore, referring to Figure 11, the lighting device 1000 can be provided in various forms and provide various forms of light. Specifically, when viewed from above, it can have various forms such as figures, characters, emoticons, etc. As an example, the lighting device 1000 can have a rectangular shape as shown in Figure 11, and can emit light of various wavelength bands in a rectangular or circular shape.

[0154] More specifically, the lighting device 1000 may include the first to fifth regions R1, R2, R3, R4, and R5 demarcated by the first to fifth resin layers 410, 420, 430, 440, and 450. In this case, the first to fifth regions R1, R2, R3, R4, and R5 can emit light of different or the same wavelength bands. For example, the first region R1 emits the first light L1, the second region R2 emits the second light L2, and the third region R3 emits the third light L3. Also, the fourth region R4 emits the first light L1, and the fifth region R5 emits the third light L3.

[0155] In other words, the lighting device 1000 according to the embodiment can emit light in a variety of wavelength bands by utilizing a light-emitting element 200 that emits light in a set wavelength band, for example, a single wavelength band. Furthermore, the lighting device 1000 can adjust the brightness of the first to third lights L1, L2, L3 emitted from the first to fifth regions R1, R2, R3, R4, R5, respectively, by adjusting the width and / or height of the first to fifth resin layers 410, 420, 430, 440, 450. Thus, the lighting device 1000 according to the embodiment has a simple structure, can be provided in a slim form, and can have improved aesthetics.

[0156] Figure 12 is a diagram illustrating an example in which a lamp including a lighting device according to the embodiment is applied to a vehicle.

[0157] Referring to Figure 12, the lighting device 1000 according to the embodiment can be applied to a vehicle 2000. The lamps include the lighting device 1000 and are positioned at least one at one of the following locations: the front 2100, the rear 2200, and the side 2300 of the vehicle 2000.

[0158] For example, the lamp is positioned in an area corresponding to an emblem or logo located at least one of the front 2100, rear 2200, and side 2300 of the vehicle 2000. That is, the lamp can be used as an emblem lamp or logo lamp for the vehicle 2000. Specifically, the first area R1 of the lighting device 1000, which has relatively high brightness, is formed to correspond to the shape of the emblem or logo of the vehicle 2000. As a result, when the lamp is turned on, the first light L1 is visible to the outside in the shape of the vehicle's emblem or logo.

[0159] Furthermore, light of various wavelengths is emitted around the emblem or logo shape. For example, second and third lights L2 and L3 are emitted around the emblem or logo shape, having lower brightness than the first light L1 and in different wavelength bands. In this case, the second and third lights L2 and L3 can have shapes corresponding to the emblem or logo shape, and their brightness can decrease in a gradation pattern as they move away from the first region R1 from which the first light L1 is emitted.

[0160] When the lighting device 1000 is applied as shown in Figure 4, the first light L1 is emitted at a wider angle. As a result, when the lamp is turned on, the emblem shape or logo shape is visible from the outside at a wider angle.

[0161] Furthermore, when the lighting device 1000 is applied as shown in Figure 5, the first light L1 can have a three-dimensional appearance due to the multiple diffusion layers 510, 520. As a result, when the lamp is turned on, the emblem shape or logo shape is visible from the outside in multiple layers. Therefore, when the emblem or logo is viewed from the outside, it is perceived as three-dimensional.

[0162] In other words, the lamp according to the embodiment can emit light in various wavelength bands by utilizing a single-wavelength light-emitting element. Furthermore, the lamp may be provided in a simple and slim structure and can emit light in a manner that corresponds to various emblem and logo shapes. Thus, the lamp according to the embodiment can improve aesthetics and design freedom.

[0163] The features, structures, and effects described in the above embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to a single embodiment. Furthermore, the features, structures, and effects exemplified in each embodiment can be combined or modified for implementation in other embodiments by a person with ordinary skill in the art to which the embodiment belongs. Therefore, such combinations and modifications should be interpreted as being included within the scope of the present invention.

[0164] Furthermore, although the above description has focused on embodiments, these are merely illustrative examples and do not limit the present invention. Anyone with ordinary skill in the art to which the present invention belongs can make various modifications and applications not exemplified above, within the bounds of the essential characteristics of these embodiments. For example, each component specifically presented in the embodiments can be modified and implemented. Such differences in modifications and applications should be interpreted as being within the scope of the present invention as defined in the appended claims.

Claims

1. circuit board and A light-emitting element placed on the substrate, A first reflective member is placed on the substrate, A resin layer placed on the first reflective member, The resin layer includes a wavelength conversion layer disposed on top of the resin layer, The aforementioned resin layer is The first resin layer and A second resin layer separated from the first resin layer, A third resin layer disposed between the first and second resin layers, The wavelength conversion layer is A first wavelength conversion layer disposed on the first resin layer, The present invention includes a second wavelength conversion layer disposed on the second resin layer, The height of the second resin layer is different from the height of the first resin layer. The aforementioned light-emitting element is positioned in a region that does not overlap the second and third resin layers perpendicularly, but overlaps the first resin layer perpendicularly, in this lighting device.

2. The lighting device according to claim 1, wherein the height of the second resin layer is lower than the height of the first resin layer.

3. The lighting device according to claim 2, wherein the third resin layer includes a region in which the height increases from the first resin layer to the second resin layer.

4. The lighting device according to claim 3, wherein the upper surface of the third resin layer includes at least one of a flat surface and a curved surface.

5. The lighting device according to claim 1, further comprising a first diffusion layer disposed between the first resin layer and the first wavelength conversion layer.

6. The lighting device according to claim 1, wherein the second wavelength conversion layer includes at least one of a phosphor and a quantum dot that converts light to a wavelength band different from that of the first wavelength conversion layer.

7. It includes a second reflective member disposed on the outer surface of the resin layer, The lighting device according to claim 1, wherein the second reflective member is arranged on at least one of the side surfaces of the first resin layer, the side surface of the second resin layer, and the upper surface of the third resin layer.

8. The lighting device according to claim 7, wherein, when the second reflective member is positioned on the side surface of the first resin layer, the second reflective member facing the upper surface of the third resin layer includes an open region that exposes a portion of the side surface of the first resin layer.

9. Includes a sub-light-emitting element separated from the aforementioned light-emitting element, The lighting device according to claim 1, wherein the sub-light-emitting element is arranged in a region that does not overlap perpendicularly with the second and third resin layers but overlaps perpendicularly with the first resin layer.

10. The lighting device according to claim 9, wherein the light-emitting surface of the sub-light-emitting element has a different orientation from the light-emitting surface of the light-emitting element.

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