Lighting device and lamp including same

Abstract

The lighting device disclosed in the embodiments of the invention includes a substrate, a light-emitting element arranged on the substrate, a reflective layer arranged on the substrate, a resin layer arranged on the reflective layer, and a light control member arranged on the resin layer, wherein the light control member includes a first base material arranged on the resin layer, a second base material arranged on the first base material, and a first adhesive member arranged between the first and second base materials, and includes first air gaps formed in areas between the first and second base materials where the first adhesive member is not arranged, and the number of the first air gaps may be greater than or equal to the number of the light-emitting elements.

Description

[Technical Field]

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

[0002] Lighting devices, which can provide light or adjust the amount of light, are used in a variety of fields. For example, lighting devices are applied to various fields, such as vehicles and buildings, to brighten the interior or exterior of a room. Recently, light-emitting devices have been used as lighting sources. Light-emitting devices, such as light-emitting diodes (LEDs), have advantages over existing light sources, such as fluorescent lamps and incandescent lamps, including low power consumption, a semi-permanent lifespan, fast response speed, safety, and environmental friendliness. Light-emitting diodes are applied to various optical assemblies, such as various display devices and interior and exterior lamps. Vehicles generally use lamps of various colors and shapes, and recently, lamps using light-emitting diodes as vehicle light sources have been proposed. For example, light-emitting diodes are used in vehicle headlights, taillights, turn signals, and the like. However, light-emitting diodes have a problem in that the angle of light emission is relatively small. Therefore, when light-emitting diodes are used as vehicle lamps, there is a demand for an increased light-emitting area. Furthermore, when a lamp includes light-emitting diodes, heat generated by the light-emitting diodes can degrade the performance of the light-emitting diodes or reduce the uniformity of the light they emit. Furthermore, when a lamp includes a light emitting diode, there is a problem that hot spots are formed due to the light emitted from the light emitting diode. When a surface light source is realized using such a lamp, there is a problem that the uniformity of the light emitting surface is deteriorated. Therefore, a new lighting device and lamp that can solve the above problems are required. Summary of the Invention [Problem to be solved by the invention]

[0003] SUMMARY OF THE INVENTION Embodiments of the invention are intended to provide a lighting device and a lamp having improved luminous intensity, and to provide a lighting device and a lamp that can realize a uniform linear light source or a surface light source. [Means for solving the problem]

[0004] An illumination device according to an embodiment of the invention includes a substrate, light-emitting elements arranged on the substrate, a reflective layer arranged on the substrate, a resin layer arranged on the reflective layer, and a light control member arranged on the resin layer, wherein the light control member includes a first base material arranged on the resin layer, a second base material arranged on the first base material, and a first adhesive member arranged between the first and second base materials, and includes first air gaps formed in areas between the first and second base materials where the first adhesive member is not arranged, and the number of the first air gaps may be greater than or equal to the number of the light-emitting elements.

[0005] According to an embodiment of the invention, the number of the first air gaps may be greater than the number of the light emitting elements, and the horizontal width of each of the plurality of first air gaps may be smaller than the horizontal width of the light emitting element. Some of the plurality of first air gaps may be disposed in an area vertically overlapping the light emitting element. The light control member may further include a third substrate disposed on the second substrate and a second adhesive member disposed between the second and third substrates, and may include a second air gap formed in an area between the second and third substrates where the second adhesive member is not disposed, and the number of the first and second air gaps may be the same as the number of the light emitting elements. The first and second air gaps may have the same shape and horizontal width.

[0006] According to an embodiment of the invention, the light-shielding member may be disposed between the third substrate and the second air gap, and the horizontal width of the light-shielding member may be smaller than the horizontal widths of the first and second air gaps. The centers of the first and second air gaps may be aligned vertically with the optical axis of the light-emitting device. The center of the first air gap may be horizontally separated from the optical axis of the light-emitting device, and the center of the second air gap may be aligned vertically with the optical axis of the light-emitting device. The light-shielding member may be disposed between the second substrate and the first air gap, and the horizontal width of the light-shielding member may be larger than the horizontal width of the first air gap.

[0007] An illumination device according to an embodiment of the invention includes a substrate, a light-emitting element disposed on the substrate, a reflective layer disposed on the substrate, a resin layer disposed on the reflective layer, and a light control member disposed on the resin layer, wherein the light control member includes a first base material disposed on the resin layer, a second base material disposed on the first base material, and a first adhesive member disposed between the first and second base materials, and includes a first air gap formed in an area between the first and second base materials where the first adhesive member is not disposed, and an emitting surface of the light-emitting element faces a side surface of the resin layer, and the number of the first air gaps may be greater than or equal to the number of the light-emitting elements.

[0008] According to an embodiment of the invention, the number of the first air gaps may be greater than the number of the light emitting elements, and the horizontal width of each of the first air gaps may be smaller than the horizontal width of the light emitting element. Some of the first air gaps may be disposed in an area vertically overlapping the light emitting element. The horizontal width of each of the first air gaps may decrease as it moves away from the light emitting element. The horizontal width of each of the first air gaps may vary from the first substrate to the second substrate. [Effects of the Invention]

[0009] The lighting device and lamp according to the embodiments of the present invention may have improved light characteristics. Specifically, the lighting device and lamp may include a light control member in which at least one air gap corresponding to a light emitting element is formed in a single layer or multiple layers. As a result, the light control member can control the path of light incident on the light control member, and in this process, the formation of hot spots where light from the light emitting element is concentrated can be prevented. Therefore, the lighting device and lamp according to the embodiments can minimize light loss during the process of light emitted from the light emitting element being emitted to the outside, and can realize a uniform line light source or surface light source.

[0010] The lighting device and lamp according to the embodiments of the present invention have improved brightness and can more effectively prevent the formation of hot spots. More specifically, the embodiments include a light-blocking sheet disposed in an area corresponding to the light-emitting element, thereby preventing the emitted light from concentrating. In this case, the embodiments can minimize the area and size of the light-blocking member formed by the light control member including at least one air gap. Therefore, the lighting device and lamp according to the embodiments can minimize light loss due to the light-blocking member and can have improved brightness. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a side cross-sectional view of a lighting device according to a first embodiment of the invention.

[0012] [Figure 2] 2 is a plan view of a reflective layer of the lighting device of FIG. 1. FIG.

[0013] [Figure 3] 2 is a top view of the lighting device according to FIG. 1;

[0014] [Figure 4] FIG. 4 is a side cross-sectional view of a lighting device according to a second embodiment of the invention.

[0015] [Figure 5] FIG. 5 is a top view of the lighting device of FIG.

[0016] [Figure 6] FIG. 10 is a side cross-sectional view showing another example of the lighting device according to the second embodiment of the invention.

[0017] [Figure 7] FIG. 10 is a side cross-sectional view showing another example of the lighting device according to the second embodiment of the invention.

[0018] [Figure 8] FIG. 10 is a side cross-sectional view showing another example of the lighting device according to the second embodiment of the invention.

[0019] [Figure 9] FIG. 10 is a side cross-sectional view showing another example of the lighting device according to the second embodiment of the invention.

[0020] [Figure 10] FIG. 10 is a side cross-sectional view of a lighting device according to a third embodiment of the invention.

[0021] [Figure 11] FIG. 11 is a top view of the lighting device of FIG. 10 according to the invention.

[0022] [Figure 12] FIG. 10 is a side cross-sectional view of a lighting device according to a fourth embodiment of the invention.

[0023] [Figure 13] FIG. 13 is a top view of the lighting device of FIG.

[0024] [Figure 14] FIG. 10 is a side cross-sectional view showing another example of an illumination device according to the fourth embodiment of the invention.

[0025] [Figure 15] FIG. 10 is a side cross-sectional view showing another example of an illumination device according to the fourth embodiment of the invention.

[0026] [Figure 16] 1 is a top view of a vehicle to which a lamp including a lighting device according to an embodiment of the invention is applied;

[0027] [Figure 17] 17 is an example of a front lighting device for the vehicle of FIG. 16.

[0028] [Figure 18] 17 is an example of a rear lighting device for the vehicle of FIG. 16. DETAILED DESCRIPTION OF THE INVENTION

[0029] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0030] The technical concept of the present invention is not limited to the described embodiments and may be embodied in various forms. Elements of the embodiments may be selectively combined or substituted within the scope of the technical concept of the present invention. Furthermore, terms (including technical and scientific terms) used in the embodiments of the present invention, unless expressly specified, shall be interpreted as having meanings commonly understood by those skilled in the art to which the present invention pertains. Commonly used terms, such as dictionary-defined terms, shall be interpreted in light of the context of the relevant technology. Furthermore, the terms used in the embodiments of the present invention are intended to describe the embodiments and are not intended to limit the present invention. In this specification, the singular form "a," "an," or "an" may also include the plural form unless otherwise specified. For example, "at least one (or more) of A and B and C" refers to any combination of A, B, and C that can be combined. Furthermore, when describing elements of the embodiments of the present invention, terms such as "first," "second," "A," "B," "(a)," and "(b)" may be used. These terms are used to distinguish elements from other elements, and do not limit the nature or order of the elements. Furthermore, when a component is described as being "coupled," "coupled," or "connected" to another component, this includes both cases where the component is directly coupled or connected to the other component, and cases where further components are "coupled," "coupled," or "connected" between the components. Furthermore, when a component is described as being formed or located "above or below" another component, "above or below" does not only include cases where the two components are in direct contact, but also cases where one or more further components are formed or located between the two components. Furthermore, when the term "above or below" is used, it can mean not only the upper direction but also the lower direction based on one component.

[0031] The lighting device according to the present invention can be applied to various 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 used in headlamps, side mirror lights, side marker lights, fog lamps, tail lamps, brake lights, daytime running lights, vehicle interior lighting, door scuffs, rear combination lamps, and backup lamps. When applied to vehicle lamps, it can be used in rear side support systems (BSDs) located on side mirrors or A-pillars. The optical assembly of the present invention can also be used in indoor and outdoor advertising devices, display devices, and various train applications. It can also be used in all lighting-related and advertising-related fields that are currently being developed and commercialized, or that will be realized through future technological developments.

[0032] Furthermore, before describing embodiments of the present invention, the first direction may refer to the x-axis direction in the drawings, and the second direction may be a direction different from the first direction. For example, the second direction may refer to the y-axis direction in the drawings, which is perpendicular to the first direction. Furthermore, the horizontal direction may refer to the first and second directions, and the vertical direction may refer to a direction perpendicular to at least one of the first and second directions. For example, the horizontal direction may refer to the x-axis and y-axis directions in the drawings, and the vertical direction may be the z-axis direction in the drawings, which is perpendicular to the x-axis and y-axis directions.

[0033] <First Example> FIG. 1 is a cross-sectional view of a lighting device according to a first embodiment of the invention, FIG. 2 is a plan cross-sectional view of a reflective layer in the lighting device of FIG. 1, and FIG. 3 is a top view of the lighting device of FIG.

[0034] 1 to 3, a lighting device 1000 according to an embodiment of the invention may include a substrate 100, a light emitting device 200, a reflective layer 300, a resin layer 400, and a light control member 500. The lighting device 1000 may emit light emitted from the light emitting device 200 as a surface light source. The lighting device 1000 may 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.

[0035] The substrate 100 may include a printed circuit board (PCB). The substrate 100 may include at least one of a resin-based printed circuit board (PCB), a metal core PCB, a flexible PCB, a ceramic PCB, or an FR-4 substrate. When the substrate 100 is configured as a metal core PCB with a metal layer disposed on the bottom, the heat dissipation efficiency of the light emitting device 200 can be improved. In addition, the substrate 100 may include a light-transmitting material. More specifically, the substrate 100 may include a material through which light can be transmitted through its upper and lower surfaces. The substrate 100 may include at least one of PET (Polyethylene terephthalate), PS (Polystyrene), PI (Polyimide), PEN (Polyethylene naphthalate), and PC (Polycarbonate). The substrate 100 is electrically connected to the light emitting device 200. The substrate 100 includes a wiring layer (not shown) thereon, which is electrically connected to the light emitting device 200. When a plurality of the light emitting devices 200 are arranged on the substrate 100, the plurality of light emitting devices 200 may be connected in series, parallel, or series-parallel by the wiring layer. The substrate 100 may function as a base member or a support member disposed below the light emitting device 200 and the resin layer 400.

[0036] The light emitting device 200 is disposed on the substrate 100. The light emitting device 200 may be an LED chip emitting light from at least five surfaces and disposed on the substrate 100 in a flip chip configuration. The light emitting device 200 may emit at least one of visible light such as blue, red, green, and yellow, ultraviolet light (UV), and infrared light. The light emitting device 200 includes a plurality of light emitting surfaces as described above, and emits the strongest light toward the upper surface facing the light control member 500, which will be described later.

[0037] The light emitting device 200 may be a horizontal chip or a vertical chip. The horizontal chip has two different electrodes arranged horizontally, while the vertical chip has two different electrodes arranged vertically. The horizontal or vertical chip light emitting device 200 is connected to other chips or wiring patterns via wires. Therefore, the thickness of the module increases depending on the height of the wires, and pad space for wire bonding is required. The light emitting device 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 may emit at least one of visible light (e.g., blue, red, green, or yellow), ultraviolet (UV), and infrared light. The light emitting device 200 may emit at least one of visible light (e.g., white, blue, red, yellow, or green), ultraviolet light, and infrared light. The light emitting device 200 may be a top-view type in which the light emitting surface 201 faces upward. That is, the optical axis OA of the light emitting device 200 may be perpendicular to the top surface of the substrate 100. A plurality of light emitting devices 200 may be disposed on the substrate 100. For example, a plurality of light emitting devices 200 are disposed on the substrate 100 and spaced apart in a first direction (x-axis direction). Further, a plurality of light emitting devices 200 are disposed on the substrate 100 and spaced apart in a second direction (y-axis direction). The light emitting devices 200 may be spaced apart at horizontal intervals defined by a first pitch interval P1. Here, the first pitch interval P1 may refer to the distance between the centers of the light emitting devices 200. The light emitting devices 200 may emit light of the same color. For example, the light emitting devices 200 may emit light of the same wavelength band toward the light control member 500. Alternatively, the light emitting devices 200 may emit light of different wavelength bands. For example, some of the light emitting devices 200 may emit light of a first wavelength band, and the remaining or other part may emit light of a second wavelength band different from the first wavelength band. As a result, the lighting device 1000 can provide light of various wavelength bands using a single device.

[0038] The light emitting device 200 may include a light emitting surface 201 from which light is emitted. For example, if the light emitting device 200 emits light from five surfaces, the light emitting surface 201 may be an upper surface (facing the light control member 500) from which the strongest light is emitted. If the light emitting device 200 is a top-view type, the light emitting surface 201 may be an upper surface of the light emitting device 200 facing the light control member 500. That is, the light emitting surface 201 may refer to a surface from which the strongest light is emitted toward the light control member 500. The light emitting surface 201 may be formed as a plane parallel to the reflective layer 300 and may include a concave or convex surface. Light emitted from the light emitting device 200 may travel toward the upper surface of the resin layer 400. In addition, a portion of the emitted light may be reflected by the reflective layer 300 and travel toward the upper surface of the resin layer 400.

[0039] The reflective layer 300 is disposed on the substrate 100. The reflective layer 300 is disposed between the substrate 100 and the resin layer 400. The reflective layer 300 may be provided in the form of a film made of a metal or non-metal material. The reflective layer 300 may be attached to the upper surface of the substrate 100. The reflective layer 300 may be attached between the resin layer 400 and the substrate 100, but is not limited thereto. The reflective layer 300 may have an area smaller than the area of ​​the upper surface of the substrate 100. The reflective layer 300 may be spaced apart from the edge of the substrate 100. The resin layer 400 is disposed in a region between the reflective layer 300 and the edge of the substrate 100 and attached to the substrate 100. This prevents the edge portion of the reflective layer 300 from peeling off.

[0040] The reflective layer 300 may include an opening 301 in which the lower portion of the light emitting device 200 is disposed. The upper surface of the substrate 100 is exposed through the opening 301 of the reflective layer 300, and a portion where the lower portion of the light emitting device 200 is bonded is disposed. The size of the opening 301 may be the same as or larger than the size of the light emitting device 200, but is not limited thereto. The reflective layer 300 may be formed to have a thickness thinner than that of the light emitting device 200. The thickness of the reflective layer 300 may be within a range of 0.2 mm ± 0.02 mm. The lower portion of the light emitting device 200 is disposed on the substrate 100 through the opening 301 of the reflective layer 300, and the upper portion of the light emitting device 200 may protrude beyond the upper surface of the opening 301. The light emitting surface of the light emitting device 200 is provided in a direction perpendicular to the upper surface of the reflective layer 300.

[0041] The reflective layer 300 may include a metallic material or a non-metallic material. The metallic material may include metals such as aluminum, silver, and gold. The non-metallic material may include a plastic material or a 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 be silicone or epoxy with a reflective material, for example, a metal oxide such as TiO2, Al2O3, or SiO2 added thereto. The reflective layer 300 may be implemented as a single layer or multiple layers, and such a layer structure may improve light reflection efficiency. The reflective layer 300 according to the embodiment of the present invention reflects incident light, thereby increasing the amount of light so that the light is emitted with a uniform distribution. Here, the reflective layer 300 may be omitted if a highly reflective material is coated on the upper surface of the substrate 100. As another example, the reflective layer 300 may include a plurality of reflective materials (not shown). The reflective materials may be air bubbles or a medium having the same refractive index as air. The reflective layer 300 may reflect incident light or refract it in other directions using the plurality of reflective materials.

[0042] The reflective layer 300 may include reflective patterns 310. The reflective patterns 310 may have a plurality of dot shapes. The reflective patterns 310 are disposed on the upper surface of the reflective layer 300. For example, the reflective patterns 310 may be disposed in a form protruding from the upper surface of the reflective layer 300. The reflective patterns 310 may be disposed apart from the light emitting element 200 and surround the lower periphery of the light emitting element 200.

[0043] The reflective patterns 310 may be formed on the reflective layer 300 by printing. The reflective patterns 310 may include reflective ink. The reflective patterns 310 may be printed using a material including any one of TiO2, CaCO3, BaSO4, Al2O3, silicon, and PS. The planar shape of each of the reflective patterns 310 may be one selected from the group consisting of a circle, an ellipse, and a polygon. Each of the reflective patterns 310 may have a hemispherical or polygonal cross section. The material of the reflective patterns 310 may be white. The dot pattern density of the reflective patterns 310 may increase with increasing distance from the light emitting element 200. For example, the dot pattern density of the reflective patterns 310 per unit area may increase with increasing horizontal distance from the optical axis OA of the light emitting element 200. The size of the reflective patterns 310 may vary with increasing distance from the light emitting element 200. For example, the horizontal width of the plurality of reflective patterns 310 may increase as the reflective patterns 310 are horizontally farther from the optical axis OA of the light emitting device 200. That is, the plurality of reflective patterns 310 are disposed on a path of light emitted from the light emitting device 200 and / or a path of light emitted from the light emitting device 200 and reflected by other components, thereby improving light reflectivity, reducing light loss, and improving the brightness of the surface light source.

[0044] The resin layer 400 is disposed on the substrate 100. The resin layer 400 may face the substrate 100. The resin layer 400 may be disposed on the entire upper surface or a partial area of ​​the substrate 100. The resin layer 400 may seal the light emitting device 200 on the upper surface of the substrate 100. The resin layer 400 may contact each side and the upper surface of the light emitting device 200. The lower surface area of ​​the resin layer 400 may be equal to or larger than the upper surface area of ​​the substrate 100. The resin layer 400 may be formed of 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, such as PC, OPS, PMMA, or PVC. The resin layer 400 may be formed of glass, but is not limited thereto. For example, the resin layer 400 may be mainly made of a resin material containing urethane acrylate oligomer as a main raw material. For example, a mixture of a synthetic oligomer, urethane acrylate oligomer, and a polymer type, polyacrylic, can be used. Of course, this can further include a monomer containing low-boiling point dilution reactive monomers, such as IBOA (isobornyl acrylate), HPA (hydroxylpropyl acrylate), and 2-HEA (2-hydroxyethyl acrylate), and additives such as a photoinitiator (e.g., 1-hydroxycyclohexyl phenyl-ketone) or an antioxidant can be added.

[0045] The resin layer 400 is provided as a resin layer for guiding light, and therefore can be provided with a thinner thickness than glass and as a flexible plate. The resin layer 400 can emit point light emitted from the light emitting device 200 in the form of a line light source or a surface light source. The upper surface of the resin layer 400 can diffuse the light emitted from the light emitting device 200 and emit it. For example, beads (not shown) can be included in the resin layer 400, and the beads can diffuse and reflect incident light to increase the amount of light. The beads may be disposed in a range of 0.01 to 0.3% by weight of the resin layer 400. The beads may be made of any one selected from silicone, silica, glass bubbles, PMMA (Polymethyl methacrylate), urethane, Zn, Zr, Al2O3, and acrylic, and the particle size of the beads may be in the range of about 1 μm to about 20 μm, but is not limited thereto. The linear light source is a form of light in which light emitted from one or more light emitting elements is emitted through at least one side of the resin layer 400, and the height or thickness of the at least one side from which light is emitted may be 3 times or less or 2.5 times or less than the thickness of the light emitting elements. The surface light source is a form of light in which light emitted from one or more light emitting elements arranged horizontally and one or more light emitting elements arranged vertically is emitted over an area tens or hundreds of times larger than the upper surface area of ​​the light emitting elements.

[0046] The resin layer 400 is disposed on the light emitting device 200, thereby protecting the light emitting device 200 and reducing loss of light emitted from the light emitting device 200. The light emitting device 200 is embedded below the resin layer 400. The resin layer 400 may be in contact with the surface of the light emitting device 200 and the light emitting surface of the light emitting device 200. A portion of the resin layer 400 is disposed in the opening 301 of the reflective layer 300. A portion of the resin layer 400 may be in contact with the upper surface of the substrate 100 through the opening 301 of the reflective layer 300. As a result, the reflective layer 300 can be fixed between the resin layer 400 and the substrate 100 by being in contact with the substrate 100.

[0047] The resin layer 400 may be formed to a thickness greater than that of the light emitting device 200. For example, the thickness h1 of the resin layer 400 may be approximately 1 mm or more. Specifically, the thickness h1 of the resin layer 400 may be approximately 1 mm to approximately 10 mm. If the thickness h1 of the resin layer 400 is less than approximately 1 mm, the resin layer 400 may not be able to effectively guide the light emitted from the light emitting device 200. As a result, it may be difficult for the light source module 1000 to realize a uniform surface light source. Furthermore, if the thickness h1 of the resin layer 400 is less than approximately 1 mm, it may be difficult to effectively protect the light emitting device 200, and the adhesive strength between the resin layer 400 and the substrate 100 and the reflective layer 300 may be reduced. Furthermore, if the thickness of the resin layer 400 exceeds approximately 10 mm, the number of travel paths of the light emitted from the light emitting device 200 increases, causing light loss and reducing the brightness of the surface light. Therefore, the thickness of the resin layer 400 may be within the above range in order to provide a uniform surface light. The vertical height from the upper surface of the resin layer 400 to the upper surface of the light emitting device 200 may be greater than the thickness of the light emitting device 200. For example, the height from the upper surface of the resin layer 400 to the upper surface of the light emitting device 200 may be approximately 3 to 15 times the thickness of the light emitting device 200. The thickness of the resin layer 400 and the thickness of the light emitting device 200 may satisfy the above-mentioned ranges in order to effectively guide the point light emitted from the light emitting device 200 and emit it in the form of a line light source or a surface light source.

[0048] The light control member 500 is disposed on the resin layer 400. The light control member 500 is disposed on an upper surface of the resin layer 400. The light control member 500 may include a first substrate 511, a second substrate 512, and a first adhesive member 531. The first substrate 511 is disposed on the upper surface of the resin layer 400. The first substrate 511 may be disposed on the entire upper surface of the resin layer 400. The area of ​​the lower surface of the first substrate 511 may be the same as the area of ​​the upper surface of the resin layer 400. The lower surface of the first substrate 511 may be in contact with the upper surface of the resin layer 400. The first substrate 511 may include a light-transmitting material. For example, the first substrate 511 may include at least one of PET (Polyethylene terephthalate), PS (Polystyrene), PI (Polyimide), PEN (Polyethylene naphthalate), and PC (Polycarbonate). The first substrate 511 may have a set thickness. For example, the thickness of the first substrate 511 may be approximately 150 μm or less. Specifically, the thickness of the first substrate 511 may be approximately 100 μm or less. More specifically, the thickness of the first substrate 511 may be approximately 20 μm to approximately 100 μm. The first substrate 511 may be provided in the form of a light-transmitting film having a set thickness. The first substrate 511 may be a first light-transmitting film disposed on the upper surface of the resin layer 400.

[0049] The second substrate 512 is disposed on the upper surface of the first substrate 511. The second substrate 512 may include a translucent material. For example, the second substrate 512 may include at least one of PET (Polyethylene terephthalate), PS (Polystyrene), PI (Polyimide), PEN (Polyethylene naphthalate), and PC (Polycarbonate). The second substrate 512 may be a second translucent film disposed on the first substrate 511 or a first translucent film. The second substrate 512 may be provided using the same material as the first substrate 511. For example, the first and second translucent films may be formed using the same material. The second substrate 512 may have a predetermined thickness. For example, the thickness of the second substrate 512 may be approximately 150 μm or less. Specifically, the thickness of the second substrate 512 may be approximately 100 μm or less. More specifically, the thickness of the second substrate 512 may be approximately 20 μm to approximately 100 μm. The second substrate 512 may be provided in the form of a light-transmitting film having a set thickness. The second substrate 512 may be provided with the same thickness as the first substrate 511. For example, the first and second light-transmitting films may be formed with the same thickness.

[0050] The first adhesive member 531 is disposed between the first substrate 511 and the second substrate 512. The first adhesive member 531 may be an adhesive layer that bonds the first substrate 511 and the second substrate 512. The first adhesive member 531 may be formed of a transparent, light-transmitting material. For example, the first adhesive member 531 may include an adhesive material such as a heat-curable PSA, a heat-curable adhesive, a UV-curable PSA, a UV adhesive, silicone, or epoxy. The first adhesive member 531 is disposed in a predetermined region. For example, the first adhesive member 531 is disposed in a portion of the region between the first substrate 511 and the second substrate 512, and a first air gap 551 is formed in the remaining region where the first adhesive member 531 is not disposed. The first air gap 551 may be a region surrounded by the first adhesive member 531 in the region between the first substrate 511 and the second substrate 512. The first air gap 551 may have a hole shape extending between the first substrate 511 and the second substrate 512. The first air gap 551 may be formed of an air layer or a vacuum layer, and at least one or more first air gaps 551 may be disposed in the region between the first substrate 511 and the second substrate 512.

[0051] The first air gap 551 may form a first reflective surface 531S. The first reflective surface 531S may be a side surface of the first adhesive member 531. More specifically, the first reflective surface 531S may be a side surface of the first adhesive member 531 exposed by the first air gap 551. The first reflective surface 531S may be perpendicular to the upper surface of the first substrate 511. Alternatively, the first reflective surface 531S may be inclined at a certain angle with respect to the upper surface of the first substrate 511. The first reflective surface 531S is a surface formed by a difference in refractive index between the first air gap 551 and the first adhesive member 531, and can reflect incident light. Thus, the light control member 500 refracts and reflects light emitted from the light emitting element 200 in a predetermined direction, thereby preventing a hot spot phenomenon in which light is concentrated.

[0052] The number of the first air gaps 551 may be greater than the number of the light emitting devices 200. That is, one light emitting device 200 may correspond to a plurality of first air gaps 551. The plurality of first air gaps 551 may be spaced apart in a region between the first substrate 511 and the second substrate 512. The plurality of first air gaps 551 may be spaced apart at equal intervals, and the interval between the plurality of first air gaps 551 may be approximately 0.1 mm to approximately 1 mm. The plurality of first air gaps 551 may have a predetermined shape. For example, when viewed from above, the first air gaps 551 may have various shapes such as a polygon, a circle, an ellipse, or the like. The plurality of first air gaps 551 may have the same shape. For example, the upper shape of the plurality of first air gaps 551 may be a circle as shown in FIG. 3. The plurality of first air gaps 551 may have a predetermined width. For example, the horizontal width (x-axis or y-axis direction) of the first air gap 551 may be smaller than the horizontal width d1 of the light emitting device 200. As an example, the horizontal width of the first air gap 551 may be approximately 0.1 mm to approximately 1 mm. The plurality of first air gaps 551 may have the same horizontal width. The width of each of the plurality of first air gaps 551 may be constant. For example, the width of the plurality of first air gaps 551 may be constant without changing from the first base material 511 to the second base material 512. That is, the cross-sectional shape of the first air gap 551 may be a rectangle with a constant width. The plurality of first air gaps 551 are arranged at predetermined positions. More specifically, the plurality of first air gaps 551 are arranged in regions corresponding to the light emitting device 200. For example, a portion of the plurality of first air gaps 551 is arranged in a region overlapping the light emitting device 200 in the vertical direction (z-axis direction). The rest of the plurality of first air gaps 551 are arranged in a region that does not overlap with the light emitting element 200. The region where the plurality of first air gaps 551 are arranged can be defined as a first region R1.Here, the first region R1 may be a region where a plurality of first air gaps 551 are arranged to match one light emitting element 200. For example, the first region R1 may refer to a region formed by connecting the outer sides of the plurality of first air gaps 551 located at the outermost positions with a straight line in FIG.

[0053] The first region R1 may have a predetermined size. For example, if the light emitting device 200 includes an LED chip emitting light from five sides or is a top-view type in which the light emitting surface 201 faces upward, a second width d2 defined as the width of the first region R1 in the first direction may be approximately two to ten times the width of the light emitting device 200 in the first direction. More specifically, the second width d2 may be approximately three to six times the width of the light emitting device 200 in the first direction. Also, a third width d3 defined as the width of the first region R1 in the second direction may be approximately two to ten times the width of the light emitting device 200 in the second direction. More specifically, the third width d3 may be approximately three to six times the width of the light emitting device 200 in the second direction. The first regions R1 are spaced apart at a second pitch interval P2 in the horizontal direction. Here, the second pitch interval P2 may be the shortest interval between adjacent first regions R1 in the horizontal direction. The second pitch interval P2 may be smaller than the first pitch interval P1 of the light emitting elements 200.

[0054] If the width of the first air gaps 551, the spacing between the first air gaps 551, the position of the first regions R1, and the size of the first regions R1 do not satisfy the above-described ranges for the light emitting device 200, it is difficult to prevent hot spots from being formed by light emitted from the light emitting device 200. Specifically, if the size of the first regions R1 is smaller than the above-described ranges, the area required to prevent hot spots from being formed is relatively small, resulting in the formation of hot spots. Furthermore, if the size of the first regions R1 exceeds the above-described ranges, the area occupied by the first adhesive member 531 and the first air gaps 551 is relatively large, resulting in a decrease in light transmittance due to the configuration. Therefore, it is preferable that the size of the first regions R1 formed by the plurality of first air gaps 551 satisfy the above-described ranges in order to effectively prevent hot spots from being formed and minimize a decrease in light transmittance due to the first air gaps 551.

[0055] The lighting device 1000 may include a light blocking member 570. The light blocking member 570 is disposed on the light control member 500. The light blocking member 570 is disposed between the first substrate 511 and the second substrate 512. The light blocking member 570 is disposed on the lower surface of the second substrate 512 facing the first substrate 511. The light blocking member 570 is disposed between the second substrate 512 and the first adhesive member 531. The light blocking member 570 is also disposed between the second substrate 512 and the plurality of first air gaps 551. The light blocking member 570 is printed in multiple layers on the lower surface of the second substrate 512. The light blocking member 570 may have a structure including multiple patterns having different sizes. When viewed from above, the light blocking member 570 may have various planar shapes such as a circle, an ellipse, a polygon, or the like. For example, the planar shape of the light blocking member 570 may include a curved shape in consideration of the directivity angle of the light emitting device 200. The number of light blocking members 570 may be the same as the number of light emitting devices 200, and the light blocking members 570 may be arranged in an area overlapping the light emitting devices 200 in the third direction (z-axis direction). A portion of the light blocking member 570 may be arranged in an area overlapping a portion of the first air gaps 551 in the third direction. The light blocking member 570 may have a shape extending in the horizontal direction. The light blocking member 570 may have a fourth width d4 defined as a width in the first direction, which may be greater than the width d1 of the light emitting device 200 in the first direction and the horizontal width of the first air gaps 551, and may be smaller than the second width d2 of the first region R1. The light blocking member 570 may have a fifth width d5 ​​defined as a width in the second direction, which may be greater than the width of the light emitting device 200 in the second direction and smaller than the third width d3 of the first region R1.

[0056] The lighting device 1000 according to the embodiment of the invention may include a plurality of first air gaps 551 matched with one light emitting element 200, and each of the plurality of first air gaps 551 may have a width smaller than that of the light emitting element 200. As a result, the embodiment may prevent the formation of a hot spot where light is concentrated by light emitted from the light emitting element 200. More specifically, light incident on the light control member 500 is reflected and refracted by the first adhesive member 531, the first air gap 551, and the first reflecting surface 531S, changing its emission direction. In this process, the light from the light emitting element 200 may be prevented from concentrating. The lighting device 1000 according to the embodiment of the invention further includes the light blocking member 570, thereby more effectively preventing the formation of a hot spot where light is concentrated. The lighting device 1000 may minimize the area and / or size of the light blocking member 570 formed by the first air gaps 551, thereby minimizing light loss due to the light blocking member 570. As a result, the lighting device 1000 according to the embodiment can realize a uniform line light source or surface light source with improved brightness. In addition, the lighting device 1000 forms a plurality of first air gaps 551 in one adhesive member, and the light control member 500 can have a thinner thickness.

[0057] <Second Example> Fig. 4 is a side cross-sectional view of a lighting device according to a second embodiment of the present invention, and Fig. 5 is a top view of the lighting device of Fig. 4. In the description using Figs. 4 and 5, the description of the same or similar components as those of the lighting device described above will be omitted, and the same reference numerals will be used, and they can be selectively applied to this embodiment.

[0058] 4 and 5, a lighting device 1000 according to a second embodiment of the present invention may include a light emitting element 200 and a light control member 500 disposed on the resin layer 400. The light emitting element 200 may include an LED chip that emits light from five sides, or may be a top-view type in which the light emitting surface 201 faces upward. The light control member 500 is disposed on the upper surface of the resin layer 400 and may include the first substrate 511, the second substrate 512, the first adhesive member 531, a third substrate 513, and a second adhesive member 532. The first adhesive member 531 is disposed between the first substrate 511 and the second substrate 512. The first adhesive member 531 may be an adhesive layer that bonds the first substrate 511 and the second substrate 512.

[0059] The first adhesive member 531 is disposed in a predetermined region. For example, the first adhesive member 531 is disposed in a portion of the region between the first substrate 511 and the second substrate 512, and a first air gap 551 is formed in the remaining region where the first adhesive member 531 is not disposed. The first air gap 551 may be a region between the first substrate 511 and the second substrate 512 and surrounded by the first adhesive member 531. The first air gap 551 may have a hole shape extending between the first substrate 511 and the second substrate 512. The first air gap 551 is formed of an air layer or a vacuum layer, and at least one first air gap 551 is disposed in the region between the first substrate 511 and the second substrate 512. The first air gap 551 may form a first reflective surface 531S. The first reflective surface 531S may be a side surface of the first adhesive member 531. In detail, the first reflective surface 531S may be a side surface of the first adhesive member 531 exposed by the first air gap 551. The first reflective surface 531S may be perpendicular to the upper surface of the first substrate 511. Alternatively, the first reflective surface 531S may be disposed at an inclination angle with the upper surface of the first substrate 511. The first reflective surface 531S is formed by a difference in refractive index between the first air gap 551 and the first adhesive member 531, and can reflect incident light. Thus, the light control member 500 refracts and reflects light emitted from the light emitting element 200 in a predetermined direction, thereby preventing the occurrence of a hot spot phenomenon where light is concentrated.

[0060] The number of the first air gaps 551 is the same as the number of the light emitting devices 200. That is, the first air gaps 551 are arranged in a one-to-one match with the light emitting devices 200. The first air gaps 551 are arranged spaced apart in a region between the first substrate 511 and the second substrate 512. At this time, the first air gaps 551 may be spaced apart at equal intervals. For example, the interval between the first air gaps 551 may be about 0.1 mm to about 1 mm. The first air gaps 551 are arranged at predetermined positions. For example, the first air gaps 551 are arranged in regions corresponding to the light emitting devices 200. More specifically, the first air gaps 551 are arranged in a region where the centers of the first air gaps 551 vertically overlap with the optical axis OA of the light emitting devices 200 to which they are matched. The first air gaps 551 may have a predetermined shape. For example, when viewed from above, the first air gap 551 may have various shapes, such as a polygon, a circle, or an ellipse. The plurality of first air gaps 551 may have the same shape. For example, the upper shape of the plurality of first air gaps 551 may be circular as shown in FIG. 5. The plurality of first air gaps 551 may have a predetermined width. For example, the width of the first air gap 551 in the horizontal direction (x-axis or y-axis direction) may be greater than the horizontal width d1 of the light emitting device 200. The plurality of first air gaps 551 may have the same horizontal width. The width of each of the plurality of first air gaps 551 may be constant. For example, the width of the plurality of first air gaps 551 may be constant without changing from the first substrate 511 to the second substrate 512. That is, the cross-sectional shape of the first air gap 551 may be a rectangle with a constant width, as shown in FIG. 4.

[0061] The first air gaps 551 may have widths in the first and second directions. For example, a second width d2 defined as the width of the first air gaps 551 in the first direction may be approximately two to ten times the width d1 of the light emitting device 200 in the first direction. Specifically, the second width d2 may be approximately three to six times the width d1 of the light emitting device 200 in the first direction. Furthermore, a third width d3 defined as the width of the first air gaps 551 in the second direction may be approximately two to ten times the width of the light emitting device 200 in the second direction. Specifically, the third width d3 may be approximately three to six times the width of the light emitting device 200 in the second direction. The first air gaps 551 are spaced apart at a second pitch interval P2 based on the horizontal direction. Here, the second pitch interval P2 may be the shortest interval between adjacent first air gaps 551 in the horizontal direction. The second pitch interval P2 may be smaller than the first pitch interval P1 of the light emitting devices 200.

[0062] The third substrate 513 is disposed on the second substrate 512. The third substrate 513 is disposed on the upper surface of the second substrate 512. The third substrate 513 may include a translucent material. For example, the third substrate 513 may include at least one of PET (Polyethylene terephthalate), PS (Polystyrene), PI (Polyimide), PEN (Polyethylene naphthalate), and PC (Polycarbonate). The third substrate 513 may be provided using the same material as the first substrate 511 and the second substrate 512. The third substrate 513 may be a third translucent film disposed on a second translucent film. The first, second, and third translucent films may be made of the same material. The first, second, and third translucent films may have the same area. The third substrate 513 may have a predetermined thickness. For example, the thickness of the third substrate 513 may be approximately 150 μm or less. Specifically, the thickness of the third substrate 513 may be approximately 100 μm or less. More specifically, the thickness of the third substrate 513 may be approximately 20 μm to approximately 100 μm. The third substrate 513 may be provided in the form of a light-transmitting film having a set thickness. Also, the third substrate 513 may be provided with the same thickness as the first substrate 511 and the second substrate 512. The first, second, and third light-transmitting films may have the same thickness.

[0063] The second adhesive member 532 is disposed between the second substrate 512 and the third substrate 513. The second adhesive member 532 may be an adhesive layer that bonds the second substrate 512 and the third substrate 513. The second adhesive member 532 may be formed of a transparent, light-transmitting material. For example, the second adhesive member 532 may include an adhesive material such as a heat-curable PSA, a heat-curable adhesive, a UV-curable PSA, a UV adhesive, silicone, or epoxy. The second adhesive member 532 is disposed in a predetermined region. For example, the second adhesive member 532 is disposed in a portion of the region between the second substrate 512 and the third substrate 513, and a second air gap 552 is formed in the remaining region where the second adhesive member 532 is not disposed. The second air gap 552 may be a region surrounded by the second adhesive member 532 in the region between the second substrate 512 and the third substrate 513. The second air gap 552 may have a hole shape extending between the second substrate 512 and the third substrate 513. The second air gap 552 is formed of an air layer or a vacuum layer, and at least one second air gap 552 is disposed in the region between the second substrate 512 and the third substrate 513. The second air gap 552 may form a second reflective surface 532S. The second reflective surface 532S may be a side surface of the second adhesive member 532. More specifically, the second reflective surface 532S may be a side surface of the second adhesive member 532 exposed by the second air gap 552. The second reflective surface 532S may be perpendicular to the upper surface of the second substrate 512. Alternatively, the second reflective surface 532S may be disposed at a certain inclination angle with respect to the upper surface of the second substrate 512. The second reflective surface 532S is a surface formed by the difference in refractive index between the second air gap 552 and the second adhesive member 532, and can reflect incident light. The second reflecting surface 532S may be parallel to the first reflecting surface 531S. Specifically, the second reflecting surface 532S may be disposed on the same plane as the first reflecting surface 531S. Thus, the light controlling member 500 refracts and reflects the light emitted from the light emitting element 200 in a predetermined direction, thereby preventing the occurrence of a hot spot phenomenon where light is concentrated.

[0064] The number of second air gaps 552 is the same as the number of the light emitting devices 200 and the first air gaps 551. That is, the second air gaps 552 are arranged in a 1:1 match with the light emitting devices 200 and the first air gaps 551, respectively. The second air gaps 552 are arranged spaced apart in the region between the second substrate 512 and the third substrate 513. At this time, the second air gaps 552 may be spaced apart at equal intervals. For example, the interval between the second air gaps 552 may be approximately 0.1 mm to approximately 1 mm. The second air gaps 552 are arranged at predetermined positions. For example, the second air gaps 552 are arranged in regions corresponding to the light emitting devices 200 and the first air gaps 551. More specifically, the second air gaps 552 are arranged in a region where the center of the second air gap 552 vertically overlaps with the optical axis OA of the light emitting device 200 and the center of the first air gap 551. The second air gaps 552 may have a predetermined shape. For example, when viewed from above, the second air gaps 552 may have various shapes such as a polygon, a circle, an ellipse, etc. The plurality of second air gaps 552 may have the same shape. Also, the second air gaps 552 may have the same shape as the first air gap 551. For example, the upper shape of the plurality of second air gaps 552 may be a circle as shown in FIG. 5.

[0065] The second air gaps 552 may have a predetermined width. For example, the width of the second air gaps 552 in the horizontal direction (x-axis or y-axis direction) may be larger than the horizontal width d1 of the light emitting device 200. The second air gaps 552 may have the same horizontal width. The width of each of the second air gaps 552 may be constant. For example, the width of the second air gaps 552 may be constant without changing from the second base material 512 to the third base material 513. That is, the cross-sectional shape of the second air gaps 552 may be a rectangular shape with a constant width, as shown in FIG. 4. The second air gaps 552 may have widths in the first and second directions. For example, the second air gaps 552 may have the same widths in the first and second directions as the first air gaps 551. Specifically, a second width d2 defined by the width of the second air gap 552 in the first direction may be the same as the second width d2 of the first air gap 551 and may be approximately two to ten times the width of the light emitting element 200 in the first direction. Specifically, the second width d2 of the second air gap 552 may be approximately three to six times the width of the light emitting element 200 in the first direction. Furthermore, a third width d3 defined by the width of the second air gap 552 in the second direction may be the same as the third width d3 of the first air gap 551 and may be approximately two to ten times the width of the light emitting element 200 in the second direction. Specifically, the third width d3 of the second air gap 552 may be approximately three to six times the width of the light emitting element 200 in the second direction. The second air gaps 552 are spaced apart at the second pitch interval P2 based on the horizontal direction. Here, the second pitch interval P2 may be the shortest interval between the second air gaps 552 adjacent in the horizontal direction. The second pitch distance P2 of the second air gaps 552 may be the same as the second pitch distance P2 of the first air gaps 551 or may be smaller than the first pitch distance P1 of the light emitting devices 200.

[0066] The lighting device 1000 may include a light blocking member 570. The light blocking member 570 is disposed on the light control member 500. The light blocking member 570 is disposed on the outermost substrate among the plurality of substrates 511, 512, and 513. That is, the light blocking member 570 is disposed on the third substrate 513. The light blocking member 570 is disposed on the lower surface of the third substrate 513 facing the second substrate 512. The light blocking member 570 is disposed between the third substrate 513 and the second air gap 552. The light blocking member 570 is printed in a plurality of overlapping layers. The light blocking member 570 may also have a structure including a plurality of patterns having different sizes. When viewed from above, the light blocking member 570 may have a planar shape of various shapes, such as a circle, an ellipse, or a polygon. For example, the planar shape of the light blocking member 570 may include a curved shape in consideration of the directivity angle of the light emitting device 200, etc.

[0067] The light blocking members 570 may be provided in the same number as the light emitting devices 200 and may be arranged in an area overlapping the light emitting devices 200 in the third direction. The light blocking members 570 may be provided in the same number as the first air gaps 551 and the second air gaps 552 and may be arranged in an area overlapping the first air gaps 551 and the second air gaps 552 in the third direction. The center of the light blocking member 570 may overlap the center of the first air gap 551 and the center of the second air gap 552 in the third direction and may overlap the optical axis OA of the light emitting device 200. The light blocking member 570 may have a shape extending in the horizontal direction. The light blocking member 570 may have a fourth width d4 defined as a width in the first direction, and the fourth width d4 may be greater than the width d1 of the light emitting device 200 in the first direction and smaller than the second width d2 of the first and second air gaps 551 and 552. In addition, the light blocking member 570 may have a fifth width d5 ​​defined as the width in the second direction, and the fifth width d5 ​​may be greater than the width in the second direction of the light emitting element 200 and smaller than the third width d3 of the first and second air gaps 551 and 552.

[0068] In the lighting device 1000 according to the second embodiment of the invention, a plurality of air gaps, for example, a first air gap 551 and a second air gap 552, are formed on one light emitting element 200 in a multi-layer structure. The first air gap 551 and the second air gap 552 may have a horizontal width greater than that of the light emitting element 200 and may have the same shape and horizontal width. The first air gap 551 and the second air gap 552 are disposed in overlapping regions, and their centers may overlap with the optical axis OA of the light emitting element 200. This prevents hot spots from being formed by light emitted from the light emitting element 200. Specifically, the light controlling member 500 refracts and reflects incident light to control the direction of emission and prevent light from concentrating. The light controlling member 500 can minimize the area and size of the light blocking member 570 to be formed, thereby minimizing light loss due to the light blocking control member 500. As a result, the lighting device 1000 according to the embodiment can realize a uniform line light source or surface light source with improved brightness. The lighting device 1000 can have a thinner thickness, be flexible, and be provided in various shapes such as a straight line or a curved line.

[0069] Fig. 6 is another cross-sectional view of the lighting device according to the second embodiment. In the description using Fig. 6, the description of the same or similar components as those of the lighting device described above will be omitted, and the same reference numerals will be used, and they can be selectively applied to this embodiment.

[0070] 6, the light control member 500 may include the first substrate 511, the second substrate 512, the first adhesive member 531, the first air gap 551, the third substrate 513, the second adhesive member 532, the second air gap 552, and the light blocking member 570. The number of the first air gaps 551 and the second air gaps 552 is the same as the number of the light emitting devices 200. That is, the first air gaps 551 and the second air gaps 552 are arranged in a one-to-one correspondence with the light emitting devices 200. The first air gaps 551 and the second air gaps 552 may have the same shape. For example, the first air gaps 551 and the second air gaps 552 may have various upper shapes such as a polygonal shape, a circle, an ellipse, etc. The first air gaps 551 and the second air gaps 552 may have the same horizontal width. Specifically, the second width d2 of each of the first air gaps 551 and the second air gaps 552 may be approximately two to ten times the width d1 of the light emitting element 200 in the first direction. The third width d3 of each of the first air gaps 551 and the second air gaps 552 may be approximately two to ten times the width of the light emitting element 200 in the second direction. The widths of the first air gaps 551 and the second air gaps 552 may be constant from the bottom to the top. That is, the cross-sectional shapes of the first air gaps 551 and the second air gaps 552 may be rectangular shapes with a constant width, as shown in FIG. 6. The first air gaps 551 are spaced apart at the second pitch interval P2 in the horizontal direction, and the second air gaps 552 are spaced apart at the second pitch interval P2. The first air gaps 551 and the second air gaps 552 are disposed at predetermined positions. For example, the first air gap 551 and the second air gap 552 are disposed in a region corresponding to the light emitting element 200. In this case, the first air gap 551 and the second air gap 552 may be disposed in a zigzag pattern or may be disposed to partially overlap each other.Specifically, the first air gap 551 is disposed in a region where the center of the first air gap 551 does not overlap the optical axis of the light emitting device 200 within a range where the first air gap 551 overlaps the light emitting device 200 based on the vertical direction. That is, the center of the first air gap 551 is disposed in a region horizontally separated from the optical axis OA of the light emitting device 200. In addition, the second air gap 552 is disposed in a region where the center of the first air gap 551 overlaps the optical axis OA of the light emitting device 200. As a result, the first reflecting surface 531S and the second reflecting surface 532S are not disposed on the same plane but are disposed to have a step.

[0071] The light blocking member 570 is disposed on the outermost substrate among the plurality of substrates 511, 512, and 513. The light blocking member 570 is disposed on the lower surface of the third substrate 513. The number of the light blocking members 570 is the same as the number of the light emitting devices 200, the first air gaps 551, and the second air gaps 552. The centers of the light blocking members 570 are disposed in an area overlapping with the optical axis OA of the light emitting device 200 and the center of the second air gap 552 in the third direction, and may not overlap with the center of the first air gap 551 in the third direction.

[0072] In another example of the lighting device 1000 according to the second embodiment of the invention, a plurality of air gaps, for example, a first air gap 551 and a second air gap 552, are formed on one light emitting device 200 in a multi-layer structure. The second air gap 552, which is the outermost air gap of the multi-layer structure, is disposed so that its center coincides with the optical axis OA of the light emitting device 200, and the first air gap 551 disposed below it is disposed so that its center does not overlap with the optical axis OA or the center of the second air gap 552. This more effectively prevents hot spots from being formed by light emitted from the light emitting device 200. More specifically, the first air gap 551 and the second air gap 552 according to this embodiment are disposed in a zigzag pattern, and the positions of the first reflecting surface 531S and the second reflecting surface 532S can be controlled by controlling the distance between the center of the first air gap 551 and the optical axis OA. This allows the reflection angle of light incident on the light control member 500 to be controlled, thereby enabling more diverse control of the emission direction. Therefore, the lighting device 1000 according to the embodiment may have improved brightness, effectively control the formation of hot spots, and realize a uniform line light source or surface light source.

[0073] 7 is another cross-sectional view of the lighting device according to the second embodiment. In the description using FIG. 7, the description of the same or similar components as those of the lighting device described above will be omitted, and the same reference numerals will be used, and they can be selectively applied to this embodiment.

[0074] 7, the lighting device 1000 according to the embodiment has air gaps formed in multiple layers compared to the lighting device 1000 of FIG. 4. Specifically, the light control member 500 may further include a fourth substrate 514 and a third adhesive member 533. The fourth substrate 514 is disposed on the third substrate 513. The fourth substrate 514 is disposed on the upper surface of the third substrate 513. The fourth substrate 514 may include a light-transmitting material. For example, the fourth substrate 514 may include at least one of PET (Polyethylene terephthalate), PS (Polystyrene), PI (Polyimide), PEN (Polyethylene naphthalate), and PC (Polycarbonate). The fourth substrate 514 may be made of the same material as the first substrate 511, the second substrate 512, and the third substrate 513. The fourth substrate 514 may be a fourth light-transmitting film disposed on a third light-transmitting film. The first to fourth light-transmitting films, which are the first to fourth substrates 511, 512, 513, and 514, may be made of the same material. The first to fourth light-transmitting films may have the same upper or lower surface area. The fourth substrate 514 may have a set thickness. For example, the thickness of the fourth substrate 514 may be approximately 150 μm or less. Specifically, the thickness of the fourth substrate 514 may be approximately 100 μm or less. More specifically, the thickness of the fourth substrate 514 may be approximately 20 μm to approximately 100 μm. The fourth substrate 514 may be provided in the form of a light-transmitting film having a set thickness. Furthermore, the fourth substrate 514 may be provided with the same thickness as the first substrate 511, the second substrate 512, and the third substrate 513. The first to fourth light-transmitting films may have the same thickness.

[0075] The third adhesive member 533 is disposed between the third substrate 513 and the fourth substrate 514. The third adhesive member 533 may be an adhesive layer that bonds the third substrate 513 and the fourth substrate 514. The third adhesive member 533 may be formed of a transparent, light-transmitting material. For example, the third adhesive member 533 may include an adhesive material such as a heat-curable PSA, a heat-curable adhesive, a UV-curable PSA, a UV adhesive, silicone, or epoxy. The third adhesive member 533 is disposed in a predetermined region. For example, the third adhesive member 533 is disposed in a portion of the region between the third substrate 513 and the fourth substrate 514, and a third air gap 553 is formed in the remaining region where the third adhesive member 533 is not disposed. The third air gap 553 may be a region surrounded by the third adhesive member 533 in the region between the third substrate 513 and the fourth substrate 514. The third air gap 553 may have a hole shape extending between the third substrate 513 and the fourth substrate 514. The third air gap 553 is formed of an air layer or a vacuum layer, and at least one third air gap 553 is disposed in the region between the third substrate 513 and the fourth substrate 514. The third air gap 553 may form a third reflective surface 533S. The third reflective surface 533S may be a side surface of the third adhesive member 533. More specifically, the third reflective surface 533S may be a side surface of the third adhesive member 533 exposed by the third air gap 553. The third reflective surface 533S may be perpendicular to the upper surface of the third substrate 513. Alternatively, the third reflective surface 533S may be disposed at a certain inclination angle with respect to the upper surface of the third substrate 513. The third reflective surface 533S is a surface formed by the difference in refractive index between the third air gap 553 and the third adhesive member 533, and can reflect incident light. Therefore, the light control member 500 refracts and reflects the light emitted from the light emitting element 200 in a predetermined direction, thereby preventing the occurrence of a hot spot phenomenon where light is concentrated.

[0076] The number of third air gaps 553 is the same as the number of the light emitting elements 200, the first air gaps 551, and the second air gaps 552. That is, the third air gaps 553 are arranged in a 1:1 match with the light emitting elements 200, the first air gaps 551, and the second air gaps 552, respectively. The third air gaps 553 are arranged spaced apart in a region between the third substrate 513 and the fourth substrate 514. At this time, the third air gaps 553 may be spaced apart at equal intervals. For example, the interval between the third air gaps 553 may be about 0.1 mm to about 1 mm. The third air gaps 553 are arranged at predetermined positions. For example, the third air gaps 553 are arranged in regions corresponding to the light emitting elements 200, the first air gaps 551, and the first air gaps 551. Specifically, the third air gap 553 is disposed in a region where its center vertically overlaps with the optical axis OA of the light emitting device 200, the centers of the first air gap 551, and the second air gap 552. The third air gap 553 may have a predetermined shape. For example, when viewed from above, the third air gap 553 may have various shapes such as a polygon, a circle, an ellipse, etc. The plurality of third air gaps 553 may have the same shape. Also, the third air gap 553 may have the same shape as the first air gap 551 and the second air gap 552. The plurality of third air gaps 553 may have a predetermined width. For example, the width of the third air gap 553 in the horizontal direction (x-axis or y-axis direction) may be greater than the horizontal width d1 of the light emitting device 200. The plurality of third air gaps 553 may have the same horizontal width. The width of each of the plurality of third air gaps 553 may be constant. For example, the width of the third air gaps 553 may be constant without changing from the third base material 513 to the fourth base material 514. That is, the cross-sectional shape of the third air gaps 553 may be a rectangular shape with a constant width as shown in FIG.The third air gap 553 may have widths in the first and second directions. For example, the third air gap 553 may have the same widths in the first and second directions as the first air gap 551 and the second air gap 552. More specifically, a second width d2 defined as the width of the third air gap 553 in the first direction may be the same as the second widths d2 of the first air gap 551 and the second air gap 552, and may be approximately two to ten times the width of the light emitting device 200 in the first direction. More specifically, the second width d2 of the third air gap 553 may be approximately three to six times the width of the light emitting device 200 in the first direction. Furthermore, a third width d3 defined as the width of the third air gap 553 in the second direction may be the same as the third width d3 of the first air gap 551 and the second air gap 552, and may be approximately two to ten times the width of the light emitting device 200 in the second direction. In detail, the third width d3 of the third air gaps 553 may be approximately three to six times the width of the light emitting device 200 in the second direction. The third air gaps 553 are spaced apart at the second pitch interval P2 based on the horizontal direction. Here, the second pitch interval P2 may be the shortest interval between the third air gaps 553 adjacent in the horizontal direction. The second pitch interval P2 of the third air gaps 553 may be the same as the second pitch interval P2 of the first air gaps 551 and the second air gaps 552, or may be smaller than the first pitch interval P1 of the light emitting device 200.

[0077] The lighting device 1000 may include a light blocking member 570. The light blocking member 570 is disposed on the outermost one of the plurality of substrates 511, 512, 513, and 514. The light blocking member 570 is disposed on the lower surface of the fourth substrate 514. The light blocking member 570 is disposed between the fourth substrate 514 and the third air gap 553. The number of light blocking members 570 is the same as the number of the light emitting devices 200, the first air gap 551, the second air gap 552, and the third air gap 553. In addition, the center of the light blocking member 570 is disposed in an area overlapping the optical axis OA of the light emitting device 200, the center of the first air gap 551, the center of the second air gap 552, and the center of the third air gap 553 in the third direction. In the lighting device 1000 according to the embodiment, a plurality of (three or more) air gaps, for example, a first air gap 551, a second air gap 552, and a third air gap 553, which are matched to one light emitting element 200, are formed on the light emitting element 200 in a multi-layer structure. The first to third air gaps 551, 552, and 553 may have a horizontal width larger than that of the light emitting element 200 and may have the same shape and horizontal width. In addition, the first to third air gaps 551, 552, and 553 are arranged in overlapping regions, and their centers may overlap with the optical axis OA of the light emitting element 200. This prevents the formation of hot spots due to light emitted from the light emitting element 200. Specifically, the light control member 500 refracts and reflects incident light to control the emission direction. This prevents the light from concentrating. When the air gaps of the lighting device 1000 are formed in three or more layers as described above, it is possible to minimize the area and size of the light blocking member 570 to be formed, and to minimize light loss due to the light blocking member 570. Furthermore, although not shown in the drawings, when the air gaps of the lighting device 1000 are formed in three or more layers as described above, it is possible to effectively prevent hot spots from being formed by the plurality of air gaps 551, 552, and 553.As a result, the lighting device 1000 can omit the above-mentioned light blocking member 570, and the overall brightness of the output light can be improved.

[0078] Fig. 8 is another cross-sectional view of the lighting device according to the second embodiment. In the description using Fig. 8, the description of the same or similar components as those of the lighting device described above will be omitted, and the same reference numerals will be used, and they can be selectively applied to this embodiment.

[0079] 8, the first air gap 551, the second air gap 552, and the third air gap 553 are disposed at predetermined positions. The first air gap 551, the second air gap 552, and the third air gap 553 are disposed in a region corresponding to the light emitting device 200. For example, the center of at least one of the first air gap 551, the second air gap 552, and the third air gap 553 is horizontally spaced apart from the optical axis OA of the light emitting device 200. More specifically, the centers of the first air gap 551 and the third air gap 553 are disposed in a region overlapping the optical axis OA of the light emitting device 200 in the vertical direction. The second air gap 552 is disposed in a region overlapping the light emitting device 200 in the vertical direction, but where the center of the second air gap 552 does not overlap the optical axis OA of the light emitting device 200. The center of the second air gap 552 is disposed in a region horizontally spaced apart from the optical axis OA of the light emitting device 200. That is, the first air gap 551 and the third air gap 553 may be arranged to overlap, and the second air gap 552 may be arranged to partially overlap the remaining two air gaps 551 and 553. As a result, the first reflecting surface 531S and the third reflecting surface 533S are arranged on the same plane, and the second reflecting surface 532S is not arranged on the same plane as the first reflecting surface 531S and the third reflecting surface 533S but is arranged to have a step.

[0080] In another example of the lighting device 1000 according to the second embodiment of the invention, a plurality of air gaps, for example, a first air gap 551, a second air gap 552, and a third air gap 553, which are matched with one light emitting element 200, are formed in a multi-layer structure on the light emitting element 200. At least one air gap selected from the first air gap 551, the second air gap 552, and the third air gap 553 is disposed in an area where its center does not overlap with the optical axis OA, thereby more effectively controlling the exit direction of light incident on the light control member 500. Therefore, the lighting device 1000 according to this embodiment can effectively prevent hot spots from being formed and can implement a uniform line light source or surface light source.

[0081] 9 is another cross-sectional view of the lighting device according to the second embodiment. In the description using FIG. 9, the description of the same or similar components as those of the lighting device described above will be omitted, and the same reference numerals will be used, and they can be selectively applied to this embodiment.

[0082] 9, the first air gap 551, the second air gap 552, and the third air gap 553 are disposed at predetermined positions. The first air gap 551, the second air gap 552, and the third air gap 553 are disposed in a region corresponding to the light emitting device 200. For example, the center of at least one of the first air gap 551, the second air gap 552, and the third air gap 553 is horizontally spaced apart from the optical axis OA of the light emitting device 200. The first air gap 551, the second air gap 552, and the third air gap 553 are disposed in a stepped shape. More specifically, the first air gap 551 is disposed in a region that overlaps with the light emitting device 200 in the vertical direction but where the center of the first air gap 551 does not overlap with the optical axis OA of the light emitting device 200. The second air gap 552 is disposed in a region where the center of the second air gap 552 does not overlap the optical axis OA of the light emitting device 200 within a range where the second air gap 552 overlaps the light emitting device 200 in the vertical direction. The third air gap 553 is disposed in a region where the center of the third air gap 553 overlaps the optical axis OA of the light emitting device 200 in the vertical direction. In this case, the horizontal distance between the center of the first air gap 551 and the optical axis OA may be greater than the horizontal distance between the center of the second air gap 552 and the optical axis OA. Thus, the first reflecting surface 531S, the second reflecting surface 532S, and the third reflecting surface 533S are not disposed on the same plane but are disposed to have steps in a staircase shape.

[0083] In another example of the lighting device 1000 according to the second embodiment of the invention, a plurality of air gaps, for example, a first air gap 551, a second air gap 552, and a third air gap 553, which are matched with one light emitting element 200, are formed in a multi-layer structure on the light emitting element 200. In this case, the first air gap 551, the second air gap 552, and the third air gap 553 are arranged in a stepped shape, thereby more effectively controlling the exit direction of light incident on the light control member 500. Therefore, the lighting device 1000 according to this embodiment can effectively prevent hot spots from being formed and can implement a uniform line light source or surface light source.

[0084] <Third Example> Fig. 10 is a cross-sectional view of a lighting device according to a third embodiment of the present invention, and Fig. 11 is a top view of the lighting device according to the third embodiment. In the description using Figs. 10 and 11, the description of the same or similar components as those in the lighting device described above will be omitted, and the same reference numerals will be used, and they can be selectively applied to this embodiment.

[0085] 10 and 11, the lighting device 1000 may include a substrate 100, a light emitting element 200, a reflective layer 300, a resin layer 400, and a light control member 500.

[0086] The light emitting device 200 is disposed on the substrate 100 and electrically connected to the substrate 100. The light emitting device 200 according to the third embodiment may have a different direction of the light emitting surface 201 from the light emitting device 200 according to the first and second embodiments. For example, the light emitting device 200 according to the third embodiment may be a side view type in which the light emitting surface 201 faces the side. Specifically, the light emitting device 200 is disposed such that the light emitting surface 201 faces the side of the resin layer 400. That is, the light emitting device 200 may have an emission direction in the direction of the side of the device, and an optical axis OA of the light emitting device 200 may be parallel to the top surface of the substrate 100. The reflective layer 300 is disposed on the substrate 100. The reflective layer 300 may have a plurality of reflective patterns having a dot shape. The plurality of reflective patterns 310 may be disposed in a form protruding from the top surface of the reflective layer 300. Specifically, the reflective pattern 310 is disposed in the emission direction of the light emitting device 200. The density of the dot patterns of the plurality of reflection patterns 310 may increase as the distance from the light emitting element 200 increases. For example, the density of the reflection patterns 310 per unit area may increase as the distance from the optical axis OA of the light emitting element 200 increases in the horizontal direction. Furthermore, the size of the plurality of reflection patterns 310 may change as the distance from the light emitting element 200 increases. For example, the horizontal width of the plurality of reflection patterns 310 may increase as the distance from the optical axis OA of the light emitting element 200 increases in the horizontal direction.

[0087] The light control member 500 is disposed on the resin layer 400. The light control member 500 may include a first substrate 511, a second substrate 512, a first adhesive member 531, a third substrate 513, and a second adhesive member 532. The first adhesive member 531 is disposed between the first substrate 511 and the second substrate 512. The first adhesive member 531 may be an adhesive layer that bonds the first substrate 511 and the second substrate 512. The first adhesive member 531 is disposed in a predetermined region. For example, the first adhesive member 531 is disposed in a portion of the region between the first substrate 511 and the second substrate 512, and a first air gap 551 is formed in the remaining region where the first adhesive member 531 is not disposed. The first air gap 551 may be a region surrounded by the first adhesive member 531 in the region between the first substrate 511 and the second substrate 512. The first air gap 551 may have a hole shape extending between the first substrate 511 and the second substrate 512. The first air gap 551 is formed of an air layer or a vacuum layer, and at least one first air gap 551 is disposed in the region between the first substrate 511 and the second substrate 512.

[0088] The first air gap 551 may form a first reflective surface 531S. The first reflective surface 531S may be a side surface of the first adhesive member 531. More specifically, the first reflective surface 531S may be a side surface of the first adhesive member 531 exposed by the first air gap 551. The first reflective surface 531S may be perpendicular to the upper surface of the first substrate 511. Alternatively, the first reflective surface 531S may be inclined at a certain angle with respect to the upper surface of the first substrate 511. The first reflective surface 531S is a surface formed by a difference in refractive index between the first air gap 551 and the first adhesive member 531, and can reflect incident light. Thus, the light control member 500 refracts and reflects light emitted from the light emitting element 200 in a predetermined direction, thereby preventing a hot spot phenomenon in which light is concentrated. For this, the first air gaps 551 are disposed in a region vertically corresponding to the light emitting devices 200, and the number of the first air gaps 551 is the same as the number of the light emitting devices 200. That is, the first air gaps 551 are disposed in a one-to-one match with the light emitting devices 200. The first air gaps 551 are disposed spaced apart in a region between the first substrate 511 and the second substrate 512. At this time, the first air gaps 551 may be spaced apart at equal intervals. For example, the interval between the first air gaps 551 may be about 0.1 mm to about 1 mm. The first air gaps 551 may have a predetermined shape. For example, the first air gaps 551 may have a shape extending along the emission direction of light emitted from the light emitting device 200 when viewed from above. The upper shape of the first air gap 551 may have a curved shape taking into account the directivity angle of the light emitting device 200, etc. The first air gaps 551 may have a predetermined width. For example, the width of the first air gap 551 in the horizontal direction (x-axis or y-axis direction) may be greater than the width of the light emitting device 200 in the horizontal direction. Also, the width of each of the plurality of first air gaps 551 may be constant.For example, the width of the first air gap 551 may be constant without changing from the first base material 511 to the second base material 512. That is, the cross-sectional shape of the first air gap 551 may be a rectangular shape with a constant width as shown in FIG.

[0089] The first air gap 551 may have widths in the first and second directions. For example, a second width d2 defined as the width of the first air gap 551 in the first direction may be approximately 4 to 25 times the width of the light emitting device 200 in the first direction. More specifically, the second width d2 may be approximately 4 to 20 times the width of the light emitting device 200 in the first direction. Furthermore, a third width d3 defined as the width of the first air gap 551 in the second direction may be approximately 1.5 to 5 times the width of the light emitting device 200 in the second direction. More specifically, the third width d3 may be approximately 1.5 to 4 times the width of the light emitting device 200 in the second direction. That is, the second width d2 of the first air gap 551 corresponding to the light emitting direction of the light emitting device 200 may be larger than the third width d3. The first air gaps 551 are spaced apart at a second pitch interval P2 based on the horizontal direction. Here, the second pitch distance P2 may be the shortest distance between horizontally adjacent first air gaps 551. The second pitch distance P2 may be smaller than the first pitch distance P1 between the light emitting elements 200. Here, the first pitch distance P1 may refer to the distance between the light emitting surfaces 201 of the light emitting elements 200.

[0090] The second adhesive member 532 is disposed between the second substrate 512 and the third substrate 513. The second adhesive member 532 may be an adhesive layer that bonds the second substrate 512 and the third substrate 513. The second adhesive member 532 is disposed in a predetermined region. For example, the second adhesive member 532 is disposed in a portion of the region between the second substrate 512 and the third substrate 513, and a second air gap 552 is formed in the remaining region where the second adhesive member 532 is not disposed. The second air gap 552 may be a region surrounded by the second adhesive member 532 in the region between the second substrate 512 and the third substrate 513. The second air gap 552 may have a hole shape extending from the second substrate 512 to the third substrate 513. The second air gap 552 is formed of an air layer or a vacuum layer, and at least one second air gap 552 is disposed in the region between the second substrate 512 and the third substrate 513. The second air gap 552 may form a second reflecting surface 532S. The second reflecting surface 532S may be a side surface of the second adhesive member 532. Specifically, the second reflecting surface 532S may be a side surface of the second adhesive member 532 exposed by the second air gap 552. The second reflecting surface 532S may be perpendicular to the upper surface of the second base material 512. Alternatively, the second reflecting surface 532S may be disposed at an inclination angle with respect to the upper surface of the second base material 512. The second reflecting surface 532S is a surface formed by the difference in refractive index between the second air gap 552 and the second adhesive member 532, and can reflect incident light. The second reflecting surface 532S may be parallel to the first reflecting surface 531S. Specifically, the second reflecting surface 532S may be disposed on the same plane as the first reflecting surface 531S. Therefore, the light control member 500 can prevent a hot spot phenomenon, where light is concentrated, by refracting and reflecting the light emitted from the light emitting element 200 in a predetermined direction. To this end, the second air gap 552 is disposed in a region vertically corresponding to the light emitting element 200 and the first air gap 551.That is, the center of the second air gap 552 may vertically overlap the center of the first air gap 551. The number of the second air gaps 552 is the same as the number of the light emitting devices 200 and the number of the first air gaps 551. That is, the second air gaps 552 are arranged in a 1:1 match with the light emitting devices 200 and the number of the first air gaps, respectively. The second air gaps 552 are arranged spaced apart in the region between the second substrate 512 and the third substrate 513. At this time, the second air gaps 552 may be spaced apart at equal intervals. For example, the intervals between the second air gaps 552 may be approximately 0.1 mm to approximately 1 mm.

[0091] The second air gaps 552 may have a predetermined shape. For example, the second air gaps 552 may have a shape extending in the direction of light emitted from the light emitting device 200 when viewed from above. The upper shape of the second air gaps 552 may have a curved shape taking into account the directivity angle of the light emitting device 200, etc. The second air gaps 552 may have the same upper shape as the first air gap 551. The second air gaps 552 may have a predetermined width. For example, the width of the second air gaps 552 in the horizontal direction (x-axis or y-axis direction) may be greater than the width of the light emitting device 200 in the horizontal direction. Furthermore, the width of each of the second air gaps 552 may be constant. For example, the width of the second air gaps 552 may be constant without changing from the second substrate 512 to the third substrate 513. That is, the cross-sectional shape of the second air gaps 552 may be a rectangular shape with a constant width, as shown in FIG. 10. The second air gap 552 may have widths in the first and second directions. For example, a second width d2 defined by the width of the second air gap 552 in the first direction may be the same as the second width d2 of the first air gap 551 and may be approximately 4 to 25 times the width of the light emitting element 200 in the first direction. Specifically, the second width d2 of the second air gap 552 may be approximately 4 to 20 times the width of the light emitting element 200 in the first direction. Furthermore, a third width d3 defined by the width of the first air gap 551 in the second direction may be the same as the third width d3 of the first air gap 551 and may be approximately 1.5 to 5 times the width of the light emitting element 200 in the second direction. Specifically, the third width d3 of the second air gap 552 may be approximately 1.5 to 4 times the width of the light emitting element 200 in the second direction. That is, the second air gap 552 may have a second width d2 corresponding to the light emitting direction of the light emitting device 200 that is greater than a third width d3, or may have the same width as the first air gap 551.

[0092] The second air gaps 552 are spaced apart at a second pitch interval P2 in the horizontal direction. Here, the second pitch interval P2 may be the shortest interval between horizontally adjacent second air gaps 552. The second pitch interval P2 of the second air gaps 552 may be smaller than the first pitch interval P1 of the light emitting device 200 and may be the same as the second pitch interval P2 of the first air gaps 551.

[0093] The lighting device 1000 may include a light blocking member 570. The light blocking member 570 is disposed on the light control member 500. The light blocking member 570 is disposed on the outermost substrate among the plurality of substrates 511, 512, and 513. The light blocking member 570 is disposed on the lower surface of the third substrate 513 facing the second substrate 512. The light blocking member 570 is disposed between the third substrate 513 and the second air gap 552. When viewed from above, the light blocking member 570 may have various shapes in plan view, such as a circle, an ellipse, or a polygon. For example, the plan view of the light blocking member 570 may include a shape including a curve, taking into consideration the emission direction, beam angle, etc. of the light emitting device 200. The number of light blocking members 570 is the same as the number of light emitting devices 200, and they are disposed in an area overlapping the light emitting devices 200 in the third direction. The light blocking member 570 is disposed to extend in an output direction of light emitted from the light emitting element 200. The light blocking member 570 may have a fourth width d4 defined as a width in a first direction and a fifth width d5 ​​defined as a width in a second direction. In this case, the fourth width d4 corresponding to the optical axis OA direction of the light emitting element 200 may be larger than the fifth width d5.

[0094] In another example of the lighting device 1000 according to the third embodiment of the invention, a plurality of air gaps 550, for example, a first air gap 551 and a second air gap 552, are formed on one light emitting element 200 in a multi-layer structure. The first air gap 551 and the second air gap 552 extend along the light emitting direction of the light emitting element 200 and may have different widths in the first and second directions. This prevents hot spots from being formed due to light emitted from the light emitting element 200. Specifically, the light controlling member 500 refracts and reflects the light emitted laterally from the light emitting element 200 and incident on the light controlling member 500, thereby controlling the light emitting direction. Therefore, the light controlling member 500 prevents light from concentrating in an area corresponding to the light emitting direction of the light emitting element 200, thereby providing a uniform linear light source or a surface light source. The light control member 500 may minimize the area and size of the light blocking member 570 formed by including a plurality of air gaps, thereby minimizing light loss due to the light blocking member 570. Therefore, the lighting device 1000 may realize a uniform line light source or surface light source with improved brightness.

[0095] <Fourth Example> Fig. 12 is a cross-sectional view of a lighting device according to a fourth embodiment, and Fig. 13 is a top view of a lighting device according to the fourth embodiment. In the description using Figs. 12 and 13, the description of the same or similar components as those in the lighting devices described above will be omitted, and the same reference numerals will be used, and they can be selectively applied to this embodiment.

[0096] 12 and 13, the lighting device 1000 may include a substrate 100, a light emitting device 200, a reflective layer 300, a resin layer 400, and a light control member 500. The light emitting device 200 may be a side-view type similar to the third embodiment. That is, the light emitting surface 201 of the light emitting device 200 may face a side. More specifically, the light emitting device 200 may be disposed such that the light emitting surface 201 faces a side of the resin layer 400, and the optical axis OA of the light emitting device 200 may be parallel to the top surface of the substrate 100. The reflective layer 300 is disposed on the substrate 100. The reflective layer 300 may have a plurality of reflective patterns having a dot shape. The plurality of reflective patterns 310 may be disposed in a form protruding from the top surface of the reflective layer 300. The reflective patterns 310 are disposed in the light emitting direction of the light emitting device 200. The density of the dot patterns of the plurality of reflection patterns 310 may increase as the distance from the light emitting element 200 increases. For example, the density of the reflection patterns 310 per unit area may increase as the distance from the optical axis OA of the light emitting element 200 increases in the horizontal direction. The size of the plurality of reflection patterns 310 may change as the distance from the light emitting element 200 increases. For example, the horizontal width of the plurality of reflection patterns 310 may increase as the distance from the optical axis OA of the light emitting element 200 increases in the horizontal direction.

[0097] The light control member 500 is disposed on the resin layer 400. The light control member 500 may include a first substrate 511, a second substrate 512, and a first adhesive member 531. The first adhesive member 531 is disposed between the first substrate 511 and the second substrate 512. The first adhesive member 531 may be an adhesive layer that bonds the first substrate 511 and the second substrate 512. The first adhesive member 531 is disposed in a predetermined region. For example, the first adhesive member 531 may be disposed in a portion of the region between the first substrate 511 and the second substrate 512, and a first air gap 551 may be formed in the remaining region where the first adhesive member 531 is not disposed. The first air gap 551 may be a region surrounded by the first adhesive member 531 in the region between the first substrate 511 and the second substrate 512. The first air gap 551 may have a hole shape extending between the first substrate 511 and the second substrate 512. The first air gap 551 is formed of an air layer or a vacuum layer, and at least one first air gap 551 is disposed in the region between the first substrate 511 and the second substrate 512.

[0098] The first air gap 551 may form a first reflective surface 531S. The first reflective surface 531S may be a side surface of the first adhesive member 531. More specifically, the first reflective surface 531S may be a side surface of the first adhesive member 531 exposed by the first air gap 551. The first reflective surface 531S may be perpendicular to the upper surface of the first substrate 511. Alternatively, the first reflective surface 531S may be inclined at a certain angle with respect to the upper surface of the first substrate 511. The first reflective surface 531S is a surface formed by a difference in refractive index between the first air gap 551 and the first adhesive member 531, and can reflect incident light. Thus, the light control member 500 refracts and reflects light emitted from the light emitting elements 200 in a predetermined direction, thereby preventing the occurrence of a hot spot phenomenon where light is concentrated. The number of first air gaps 551 may be greater than the number of light emitting elements 200. That is, one light emitting device 200 may correspond to a plurality of first air gaps 551. The plurality of first air gaps 551 may be spaced apart in the region between the first substrate 511 and the second substrate 512. At this time, the plurality of first air gaps 551 may be spaced apart at equal intervals, and the interval between the plurality of first air gaps 551 may be approximately 0.1 mm to approximately 1 mm. The plurality of first air gaps 551 may have a predetermined shape. For example, when viewed from above, the first air gaps 551 may have various shapes such as a polygon, a circle, an ellipse, or the like. The plurality of first air gaps 551 may have the same shape. For example, the upper shape of the plurality of first air gaps 551 may be a circle as shown in FIG. 13.

[0099] The plurality of first air gaps 551 may have a predetermined width. For example, the horizontal width (x-axis or y-axis direction) of the first air gaps 551 may be smaller than the horizontal width d1 of the light emitting element 200. As an example, the horizontal width of the first air gaps 551 may be approximately 0.1 mm to approximately 1 mm. The plurality of first air gaps 551 may have the same horizontal width. The width of each of the plurality of first air gaps 551 may be constant. For example, the width of the plurality of first air gaps 551 may be constant without changing from the first base material 511 to the second base material 512. That is, the cross-sectional shape of the first air gaps 551 may be a quadrilateral shape with a constant width. The plurality of first air gaps 551 are arranged at predetermined positions. Specifically, the plurality of first air gaps 551 are arranged in regions corresponding to the light emitting elements 200. For example, with reference to the vertical direction (z-axis direction), some of the plurality of first air gaps 551 are arranged in an area overlapping with the light emitting element 200. In addition, the rest of the plurality of first air gaps 551 are arranged in an area not overlapping with the light emitting element 200, for example, an area corresponding to the emission direction of the light emitting element 200.

[0100] A region where the plurality of first air gaps 551 are arranged may be defined as a first region R1. Here, the first region R1 may be a region where the plurality of first air gaps 551, each matching with one light emitting element 200, are arranged. For example, the first region R1 may refer to a region obtained by connecting the outer sides of the plurality of outermost first air gaps 551 in FIG. 13 with straight lines. The first region R1 may have a shape corresponding to the emission direction of light emitted from the light emitting element 200 and a predetermined size. For example, a second width d2 defined as the width of the first region R1 in the first direction may be approximately 4 to 25 times the width of the light emitting element 200 in the first direction. More specifically, the second width d2 may be approximately 4 to 20 times the width of the light emitting element 200 in the first direction. Furthermore, a third width d3 defined as the width of the first region R1 in the second direction may be approximately 1.5 to 5 times the width of the light emitting element 200 in the second direction. Specifically, the third width d3 may be approximately 1.5 to approximately 4 times the width of the light emitting element 200 in the second direction. That is, the first region R1 may have a second width d2 corresponding to the light emitting direction of the light emitting element 200 that is larger than the third width d3. The first regions R1 are spaced apart at a second pitch interval P2 based on the horizontal direction. Here, the second pitch interval P2 may be the shortest interval between adjacent first regions R1 in the horizontal direction. The second pitch interval P2 may be smaller than the first pitch interval P1 of the light emitting element 200.

[0101] The lighting device 1000 may include a light blocking member 570. The light blocking member 570 is disposed between the first substrate 511 and the second substrate 512. The light blocking member 570 is disposed on the lower surface of the second substrate 512. The light blocking member 570 is disposed between the second substrate 512 and the first adhesive member 531. The light blocking member 570 is also disposed between the second substrate 512 and the first air gaps 551. When viewed from above, the light blocking member 570 may have various shapes in plan view, such as a circle, an ellipse, or a polygon. For example, the plan view of the light blocking member 570 may include a shape including a curve, taking into consideration the emission direction, beam angle, etc. of the light emitting device 200. The number of the light blocking members 570 is the same as the number of the light emitting devices 200, and the light blocking members 570 are disposed in an area overlapping the light emitting devices 200 in the third direction (z-axis direction). In addition, a portion of the light blocking member 570 is disposed in an area overlapping a portion of the plurality of first air gaps 551 in the third direction. The light blocking member 570 may have a fourth width d4 defined as a width in the first direction and a fifth width d5 ​​defined as a width in the second direction. In this case, the fourth width d4 corresponding to the optical axis OA direction of the light emitting device 200 may be larger than the fifth width d5. In addition, the fourth width d4 and the fifth width d5 ​​of the light blocking member 570 may be larger than the width of the first air gaps 551 in the horizontal direction.

[0102] The lighting device 1000 according to the fourth embodiment of the invention may include a plurality of first air gaps 551 corresponding to one light emitting element 200, and each of the plurality of first air gaps 551 may have a width smaller than that of the light emitting element 200. In addition, the plurality of first air gaps 551 may be shaped to extend along the emission direction of the light emitting element 200 and may have different widths in the first and second directions. This may prevent hot spots from being formed due to light emitted from the light emitting element 200. More specifically, the light controlling member 500 may refract and reflect light emitted laterally from the light emitting element 200 and incident on the light controlling member 500 to control the emission direction. This may prevent light from concentrating in an area corresponding to the emission direction of the light emitting element 200, and may provide a uniform line light source or a surface light source. In addition, the lighting device 1000 forms a plurality of first air gaps 551 in one adhesive member, so that the light control member 500 can have a thinner thickness.

[0103] Fig. 14 is another cross-sectional view of the lighting device according to the fourth embodiment. In the description using Fig. 14, the description of the same or similar components as those of the lighting device described above will be omitted, and the same reference numerals will be used, and they can be selectively applied to this embodiment.

[0104] Referring to FIG. 14 , the number of the first air gaps 551 may be greater than the number of the light emitting devices 200. That is, one light emitting device 200 may correspond to a plurality of first air gaps 551. The plurality of first air gaps 551 may have a predetermined shape. For example, when viewed from above, the first air gap 551 may have various shapes such as a polygon, a circle, an ellipse, etc. The plurality of first air gaps 551 may have the same shape. The plurality of first air gaps 551 may have a predetermined width. A width d11 of the first air gap 551 in a horizontal direction (x-axis or y-axis direction) may be smaller than a horizontal width d1 of the light emitting device 200. For example, the horizontal width d11 of the first air gap 551 may be approximately 0.1 mm to approximately 1 mm. Furthermore, the horizontal width d11 of each of the plurality of first air gaps 551 may be constant. Specifically, the horizontal width d11 of the plurality of first air gaps 551 may be constant without changing from the first substrate 511 to the second substrate 512. That is, the cross-sectional shape of each of the plurality of first air gaps 551 may be a rectangular shape with a constant width. The horizontal width d11 of the plurality of first air gaps 551 may vary within the above-mentioned range. For example, the horizontal width of the plurality of first air gaps 551 may decrease with increasing distance from the light emitting device 200. That is, the first air gap 551 located farthest from the light emitting device 200 may have the smallest horizontal width among the plurality of first air gaps 551. The density of the plurality of first air gaps 551 may vary depending on the distance from the light emitting device 200. For example, the density of the first air gaps 551 per unit area may increase with increasing distance from the light emitting device 200.

[0105] As a result, the fourth embodiment of the present invention can prevent the formation of hot spots where light is concentrated due to light emitted from the light emitting device 200. In particular, the lighting device 1000 according to this embodiment can prevent the formation of hot spots by controlling the position, width, density, etc. of the first air gap 551, and can minimize light loss due to the light control member 500. Therefore, the lighting device 1000 according to this embodiment can implement a uniform line light source or surface light source with improved brightness.

[0106] Fig. 15 is another cross-sectional view of the lighting device according to Example 4. In the description using Fig. 15, the description of the same or similar components as those of the lighting device described above will be omitted, and the same reference numerals will be used, and they can be selectively applied to this example.

[0107] 15, the number of the first air gaps 551 may be greater than the number of the light emitting devices 200. That is, one light emitting device 200 may correspond to a plurality of first air gaps 551. The plurality of first air gaps 551 may have a predetermined shape. For example, when viewed from above, the first air gaps 551 may have various shapes such as a polygon, a circle, an ellipse, etc. The plurality of first air gaps 551 may have the same shape. The plurality of first air gaps 551 may have a predetermined width. The width of the first air gaps 551 in the horizontal direction (x-axis or y-axis direction) may be smaller than the horizontal width d1 of the light emitting device 200. The horizontal width of each of the plurality of first air gaps 551 may vary. Specifically, the horizontal width of each of the plurality of first air gaps 551 may vary from the first substrate 511 to the second substrate 512. For example, the horizontal width of each of the first air gaps 551 may increase from the first substrate 511 toward the second substrate 512. That is, the cross-sectional shape of each of the first air gaps 551 may be a trapezoid whose width increases, and the first reflective surface 531S may be disposed so as to be inclined at a predetermined angle with respect to the upper surface of the first substrate 511. The horizontal width of each of the first air gaps 551 may be approximately 0.1 mm to approximately 1 mm. The horizontal width of each of the first air gaps 551 may vary within the above-mentioned range. For example, the horizontal width of each of the first air gaps 551 may decrease as it moves away from the light emitting device 200. That is, the first air gap 551 located farthest from the light emitting device 200 may have the smallest horizontal width among the first air gaps 551.

[0108] The density of the plurality of first air gaps 551 may vary depending on the distance from the light emitting device 200. For example, the density of the first air gaps 551 per unit area may increase as the distance from the light emitting device 200 increases. As a result, the fourth embodiment can prevent the formation of hot spots where light emitted from the light emitting device 200 concentrates. More specifically, the lighting device 1000 according to the embodiment can prevent the formation of hot spots by controlling the position, width, and density of the first air gaps 551, the inclination angle of the first reflecting surface 531S, and the like, and can minimize light loss due to the light control member 500. As a result, the lighting device 1000 according to the embodiment can implement a uniform line light source or surface light source with improved brightness.

[0109] 16 to 18 are diagrams illustrating examples in which a lamp including an illumination device according to an embodiment is applied to a vehicle. In detail, Fig. 16 is a top view of a vehicle to which a lamp having the illumination device is applied, Fig. 17 is an example in which an illumination device according to an embodiment is disposed at the front of a vehicle, and Fig. 18 is an example in which an illumination device according to an embodiment is disposed at the rear of a vehicle.

[0110] 16 to 18, the lighting device 1000 according to the embodiment may be applied to a vehicle 2000. The lamp is disposed at least one of the front, rear, and side of the vehicle 2000. For example, referring to FIG. 17, the lamp may be applied to a front lamp 2100 of the vehicle. The front lamp 2100 may include a first cover member 2110 and at least one first lamp module 2120 including the lighting device 1000. The first cover member 2110 accommodates the first lamp module 2120 and may be made of a light-transmitting material. The first cover member 2110 may have a curve depending on the design of the vehicle 2000, and may be provided with a flat or curved surface depending on the shape of the first lamp module 2120. The front lamp 2100 may provide multiple functions by controlling the driving timing of the lighting device 1000 included in the first lamp module 2120. For example, the front lamp 2100 may provide at least one function of a headlight, a turn signal light, a daytime running light, a high beam, a low beam, and a fog lamp by emitting light from the lighting device 1000. In addition, the front lamp 2100 may provide an additional function such as a welcome light or a celebration effect when a driver opens a vehicle door.

[0111] 18, the lamp may be applied to a rear lamp 2200 of a vehicle. The rear lamp 2200 may include at least one second lamp module 2220 including a second cover member 2210 and the lighting device 1000. The second cover member 2210 accommodates the second lamp module 2220 and may be made of a light-transmitting material. The second cover member 2210 may have a curve depending on the design of the vehicle 2000 and may be flat or curved depending on the shape of the second lamp module 2220. The rear lamp 2200 may provide multiple functions by controlling the driving timing of the lighting device 1000 included in the second lamp module 2220. For example, the rear lamp 2200 may provide at least one function of a side lamp, a brake light, and a turn signal light by emitting light from the lighting device 1000.

Claims

1. A substrate; a light-emitting element disposed on the substrate; a reflective layer disposed on the substrate; a resin layer disposed on the reflective layer; a light control member disposed on the resin layer, The light control member is a first substrate disposed on the resin layer; a second substrate disposed on the first substrate; a first adhesive member disposed between the first and second substrates; a first air gap formed in a region between the first and second substrates where the first adhesive member is not disposed; the number of the first air gaps is greater than the number of the light emitting elements; a light blocking member disposed between the second substrate and the first air gap; A lighting device, wherein the horizontal width of the light-blocking member is greater than the horizontal width of each of the plurality of first air gaps.

2. a horizontal width of each of the plurality of first air gaps is smaller than a horizontal width of the light emitting element; The lighting device according to claim 1 .

3. the remainder of the plurality of first air gaps are disposed in a region that does not overlap the light emitting element in a vertical direction; The lighting device of claim 2 , wherein a horizontal width of each of the plurality of first air gaps is in the range of 0.1 mm to 1 mm.

4. The plurality of first air gaps include hole shapes extending from the first substrate toward the second substrate; the region in which the plurality of first air gaps are arranged is a first region, the first region is a region in which the plurality of first air gaps corresponding to one light emitting element are arranged, The lighting device according to claim 1 , wherein some of the plurality of first air gaps are arranged in a region that vertically overlaps the light emitting element.

5. A substrate; a light-emitting element disposed on the substrate; a reflective layer disposed on the substrate; a resin layer disposed on the reflective layer; a light control member disposed on the resin layer, The light control member is a first substrate disposed on the resin layer; a second substrate disposed on the first substrate; a first adhesive member disposed between the first substrate and the second substrate; a first air gap formed in a region between the first substrate and the second substrate where the first adhesive member is not disposed; the number of the first air gaps is greater than the number of the light emitting elements; the light control member further includes a third substrate disposed on the second substrate, and a second adhesive member disposed between the second and third substrates; a second air gap formed in a region between the second and third substrates where the second adhesive member is not disposed; Lighting equipment.

6. The lighting device of claim 5 , wherein the first and second air gaps have the same shape and horizontal width.

7. a light-blocking member disposed between the third substrate and the second air gap; The lighting device according to claim 5 , wherein the horizontal width of the light blocking member is smaller than the horizontal widths of the first and second air gaps.

8. The lighting device according to claim 5 , wherein centers of the first and second air gaps overlap in a direction perpendicular to an optical axis of the light-emitting element.

9. The center of the first air gap is horizontally spaced apart from the optical axis of the light emitting device, The lighting device according to claim 5 , wherein a center of the second air gap perpendicularly overlaps with an optical axis of the light-emitting element.

10. a light-blocking member disposed between the second substrate and the first air gap; The lighting device according to claim 5 , wherein a horizontal width of the light blocking member is greater than a horizontal width of the first air gap.

11. A substrate; a light-emitting element disposed on the substrate; a reflective layer disposed on the substrate; a resin layer disposed on the reflective layer; a light control member disposed on the resin layer, The light control member is a first substrate disposed on the resin layer; a second substrate disposed on the first substrate; a first adhesive member disposed between the first and second substrates; a first air gap formed in a region between the first and second substrates where the first adhesive member is not disposed; a light-emitting surface of the light-emitting element facing a side surface of the resin layer; the number of the first air gaps is greater than the number of the light emitting elements; A lighting device, wherein horizontal widths of the plurality of first air gaps decrease with increasing distance from the light emitting element.

12. The lighting device of claim 11 , wherein a horizontal width of each of the plurality of first air gaps is smaller than a horizontal width of the light-emitting element.

13. A lighting device as described in Claim 12, wherein the horizontal width of each of the plurality of first air gaps is in the range of 0.1 mm to 1 mm.

14. A substrate, a light-emitting element disposed on the substrate; a reflective layer disposed on the substrate; a resin layer disposed on the reflective layer; a light control member disposed on the resin layer, The light control member is a first substrate disposed on the resin layer; a second substrate disposed on the first substrate; a first adhesive member disposed between the first and second substrates; a first air gap formed in a region between the first and second substrates where the first adhesive member is not disposed; the number of the first air gaps is greater than the number of the light emitting elements; A lighting device, wherein a horizontal width of each of the plurality of first air gaps varies from the first substrate toward the second substrate.

15. The plurality of first air gaps include hole shapes, the plurality of first air gaps vertically overlap one light emitting element; The lighting device according to claim 11 , wherein the remainder of the plurality of first air gaps are arranged in an area that does not overlap the light emitting element in a vertical direction.

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