Lighting modules, lighting devices and taillights

Abstract

An illumination device disclosed in an embodiment of the invention may include a substrate, a reflective member disposed on the substrate, a plurality of light-emitting elements disposed on the substrate, a resin layer disposed on the reflective member, and an optical pattern unit having a plurality of recesses formed in a concave shape on an upper surface of the resin layer. The plurality of light-emitting elements are spaced apart in a first direction in which light is emitted, and the optical pattern unit may include a pattern unit in which the width of the recesses decreases in the first direction from positions overlapping with the centers of the plurality of light-emitting elements, and a pattern unit in which the width of the recesses decreases on both sides in a second direction from the center of the optical pattern unit.

Description

[Technical Field]

[0001] Embodiments of the invention relate to lighting modules, lighting devices and taillights having multiple light sources. [Background technology]

[0002] Lighting applications include not only vehicle lighting but also backlighting for displays and signs. Light-emitting devices, such as light-emitting diodes (LEDs), offer advantages over existing light sources such as fluorescent lamps and incandescent lamps, including low power consumption, a semi-permanent lifespan, fast response, safety, and environmental friendliness. Light-emitting diodes are used in various display devices and various lighting devices, such as interior and exterior lights. Lamps using light-emitting diodes have been proposed as vehicle light sources. Compared to incandescent lamps, light-emitting diodes have the advantage of low power consumption, their small size allows for greater lamp design flexibility, and their semi-permanent lifespan makes them economical. However, because the light emitted from light-emitting diodes has a narrow angle of incidence, there is a demand for an increased light-emitting area when using light-emitting diodes as vehicle lamps. Summary of the Invention [Problem to be solved by the invention]

[0003] An embodiment of the present invention may provide a lighting module and a lighting device having a light source sealed in a resin layer and an optical pattern unit on a surface of the resin layer.An embodiment of the present invention may provide a lighting module and a lighting device having a light source sealed in a resin layer and an optical pattern unit in which recesses are arranged from the surface of the resin layer toward a substrate.

[0004] An embodiment of the invention can provide a lighting module and a lighting device in which recesses are arranged from the upper periphery of each of the light sources toward the lower surface of the resin layer. [Means for solving the problem]

[0005] An illumination device according to an embodiment of the invention includes a substrate, a reflective member disposed on the substrate, a plurality of light-emitting elements disposed on the substrate, a resin layer disposed on the reflective member, and an optical pattern unit having a plurality of recesses formed in a concave shape on an upper surface of the resin layer, wherein the plurality of light-emitting elements are spaced apart in a first direction in which light is emitted, and the optical pattern unit includes a pattern unit in which the width of the recesses decreases in the first direction from a position overlapping with the center of each of the plurality of light-emitting elements, and the optical pattern unit includes a pattern unit in which the width of the recesses decreases on both sides in a second direction from the center of the optical pattern unit.

[0006] According to an embodiment of the invention, the pattern unit of the optical pattern unit may include two or more pattern units, each of which may have a plurality of recesses arranged in a first and second direction. Each of the two or more pattern units may include a protrusion between the plurality of recesses. A first pattern unit of the two or more pattern units adjacent to each of the light emitting elements may have a recess width greater than a protrusion width. A second pattern unit of the two or more pattern units farthest from the center of the light emitting element may have a recess width equal to or smaller than a protrusion width. According to an embodiment of the invention, the plurality of recesses arranged in the optical pattern unit may have the same depth. The plurality of recesses arranged in the optical pattern unit may have different depths, and the recess depth of the first pattern unit arranged at the top of the light emitting element may be largest, and the recess depth of the second pattern unit arranged at the periphery of the optical pattern unit may be smallest. The recess may have a polygonal prism shape or a prism shape having a curved bottom. The optical pattern unit may have a maximum length in the first direction smaller than a maximum length in the second direction. The optical pattern unit may be disposed above each of the light emitting elements, and the area of ​​the optical pattern unit may be in the range of 6 to 18 times the area of ​​the light emitting element. The width of each of the recesses may be in the range of 0.25 mm to 0.5 mm. The depth of each of the recesses may be in the range of 0.25 mm to 0.65 mm. A taillight according to an embodiment of the invention is flexible and may include the lighting device. [Effects of the Invention]

[0007] According to embodiments of the invention, the light distribution characteristics of a vehicle lighting device can be improved. The lighting device has increased light distribution efficiency because the reflected light by the optical pattern portion on the surface of the resin layer is reduced. The lighting device has increased emitted light intensity by refracting light by the optical pattern portion on the surface of the resin layer. The lighting device can provide directionality to the light distribution. The lighting device can provide a thinner lighting module by disposing the optical pattern portion on the resin layer. The lighting device can improve the reliability of lighting having the optical pattern portion. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is an example of a plan view of a lighting device according to an embodiment of the invention; [Figure 2] FIG. 2 is a partially enlarged view of the resin layer of FIG. [Figure 3] 1 is a diagram showing an example of a recess of an optical pattern portion according to an embodiment of the present invention; [Figure 4] 10 is a diagram showing a modified example of a concave portion of an optical pattern portion according to an embodiment of the present invention; [Figure 5] 2 is an example of a cross-sectional side view of the lighting device of FIG. 1 in a first direction. [Figure 6] FIG. 6 is an enlarged view of an area A1 in FIG. 5. [Figure 7] 2 and 5 as viewed on a plane, as a first example of an optical pattern portion of the present invention. [Figure 8] 7, which is a cross-sectional side view of the A2 region of FIG. 5 taken along line AA' of FIG. [Figure 9] 8 is an example of a cross-sectional side view taken along line BB' in FIG. 7. [Figure 10] 10 is a diagram showing an example of a lighting module including a resin layer having a second example of an optical pattern portion of the invention. [Figure 11] 11 is a cross-sectional view taken along the line CC' in FIG. 10. [Figure 12] 11 is a cross-sectional view taken along the line DD' in FIG. 10. [Figure 13] 10 is a diagram showing an example of a lighting module including a resin layer having a third example of an optical pattern portion of the invention. [Figure 14] 14 is a cross-sectional view taken along the line EE' in FIG. 13. [Figure 15] FIG. 14 is a cross-sectional view taken along the line FF' in FIG. [Figure 16] As a fourth example of the optical pattern portion of the present invention, FIG. 5 shows an example of a cross-sectional side view taken along line AA'. [Figure 17] As a fourth example of the optical pattern portion of the present invention, FIG. 5 shows an example of a cross-sectional side view taken along the line BB'. [Figure 18] 10(a), (b), and (c) are diagrams showing light distributions in examples 1, 2, and 3 of optical pattern portions according to embodiments of the invention, and FIG. 10(d) is a diagram showing the light distribution of a comparative example. [Figure 19] 1 is a diagram showing an example of a plan view of a vehicle having a lighting device of the invention. [Figure 20] 20 is an example of a taillight of a vehicle to which the lighting device of FIG. 19 is applied. DETAILED DESCRIPTION OF THE INVENTION

[0009] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The technical concept of the present invention is not limited to the described embodiments and may be embodied in various different forms. One or more of the components 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 shall be interpreted as having meanings commonly understood by those skilled in the art to which the present invention pertains, unless expressly specified otherwise. 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 one or more of all possible combinations of A, B, and C. Furthermore, terms such as "first," "second," "A," "B," "(a)," and "(b)" may be used in describing components of the embodiments of the present invention. Such terms are used to distinguish a component from other components and do not limit the nature or order of the components. 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 another component is "coupled," "coupled," or "connected" between the two components. When a component is described as being formed or located "above or below" another component, "above or below" refers not only to cases where the two components are in direct contact with each other, but also to cases where one or more other components are formed or located between the two components. Furthermore, when a term is used "above or below," it can mean not only an upper direction but also a lower direction relative to one component.

[0010] The lighting device according to the present invention can be applied to various lamp devices requiring illumination, such as vehicle lamps, home lighting devices, and industrial lighting devices. For example, when applied to vehicle lamps, the lighting device can be used for headlamps, width lamps, turn signal lamps, side mirror lamps, fog lamps, tail lamps, brake lights, daytime running lights, vehicle interior lighting, door scuffs, rear combination lamps, backup lamps, etc. The lighting device according to the present invention can also be used in indoor and outdoor advertising devices, display devices, and various train applications. In addition, the lighting device according to the present invention can be used in all lighting-related and advertising-related fields that are currently being developed and commercialized or that can be realized through future technological advances.

[0011] FIG. 1 is an example of a plan view of a lighting device according to an embodiment of the invention, FIG. 2 is a partially enlarged view of the resin layer of FIG. 1, FIG. 3 is a drawing showing an example of a recess in an optical pattern portion according to an embodiment of the invention, FIG. 4 is a drawing showing a modified example of a recess in an optical pattern portion according to an embodiment of the invention, FIG. 5 is an example of a side cross-sectional view in a first direction of the lighting device of FIG. 1, FIG. 6 is an enlarged view of area A1 of FIG. 5, FIG. 7 is an example of a first example of an optical pattern portion of the invention, where the optical pattern portions of FIGS. 2 and 5 are viewed on a plane, FIG. 8 is an example of a side cross-sectional view of area A2 of FIG. 5, taken along line A-A' of FIG. 7, and FIG. 9 is an example of a side cross-sectional view of area B-B' of FIG. 7.

[0012] 1 to 6, a lighting device 1000 according to an embodiment of the invention may include a light emitting device 300 and a resin layer 500 that seals the light emitting device 300 and has an optical pattern unit 600. The lighting device 1000 may include a substrate 100 disposed below the light emitting device 300 and the resin layer 500. The lighting device 1000 may include a reflective member 400 disposed between the substrate 100 and the resin layer 500. The lighting device 1000 may emit light emitted from the light emitting device 300 as a surface light. The light emitting device 300 may be defined as a package having an LED chip, a light source having an LED chip, or a light source that emits visible light. The lighting device 1000 may be defined as a light emitting cell or a light source module. The lighting device 1000 may include one or more light emitting cells on the substrate 100.

[0013] <Substrate 100> 1 to 6, the substrate 100 may include a printed circuit board (PCB). The substrate 100 may include, for example, at least one of a resin-based printed circuit board (PCB), a PCB with a metal core, 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 300 can be improved. The substrate 100 is electrically connected to the light emitting device 300. The substrate 100 includes a wiring layer (not shown) on an upper portion thereof, and the wiring layer is electrically connected to the light emitting device 300. When a plurality of light emitting devices 300 are arranged on the substrate 100, the plurality of light emitting devices 300 are 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 300 and the resin layer 500. The upper surface of the substrate 100 may have an XY plane. The upper surface of the substrate 100 may have a flat or curved surface. The thickness of the substrate 100 may be a height in the vertical or Z direction. Here, in the XY plane, the X direction may be a first direction, and the Y direction may be a second direction. The Z direction may be perpendicular to the first and second directions. The light emitting devices 300 are arranged on the substrate 100 at a predetermined interval X1 in the first direction X. The substrate 100 may be provided in a linear or curved bar shape in the long direction. The substrate 100 may include a light-transmitting material that transmits light through its upper and lower surfaces. The light-transmitting material may include at least one of PET (Polyethylene terephthalate), PS (Polystyrene), and PI (Polyimide).

[0014] The substrate 100 may include an insulating layer to protect the pads and circuit patterns disposed thereon, or a layer of a reflective material.

[0015] <Light-emitting element 300> 1 to 6, the light emitting device 300 is disposed on the substrate 100 along at least a first direction X and emits light in the first direction X. The light emitting devices 300 may be arranged in N rows and / or M columns on the substrate 100, where N and M may be equal to or greater than 2. The light emitting devices 300 may be arranged in a matrix with regular intervals or irregular intervals on the substrate 100. The light emitting device 300 emits light with the highest intensity in one direction. The light emitting device 300 may have an emission surface 381 from which light is emitted, and the emission surface 381 may be disposed in a third direction or a vertical direction relative to the horizontal upper surface of the substrate 100. The emission surface 381 may be a vertical plane or may include a concave or convex surface. 6, the light emitting device 300 has one or more conductive frames 103 disposed below it. The conductive frames 103 are lead frames that face the substrate 100 and are electrically connected to pads on the substrate 100 via conductive bonding members 153. The conductive bonding members 103 may be made of solder or metal. As another example, the light emitting device 300 is disposed from one end of the substrate 100 with a first light emitting device and a second light emitting device disposed in the emission direction of the first light emitting device. The first and second light emitting devices emit light toward the other end of the substrate 100 or in the first direction. That is, the first light emitting device emits light toward the second light emitting device, and the second light emitting device emits light toward the other end of the substrate 100 or in the direction opposite to where the first light emitting device is disposed.

[0016] As shown in FIG. 6, the light emitting device 300 may be a device having a light emitting chip 371 in a body, or may include a package in which the light emitting chip 371 is packaged. The light emitting chip 371 is an LED chip and is molded in the body by a molding member. The light emitting surface 381 may be a surface of the molding member. The molding member may be made of a transparent resin material such as silicone or epoxy. The light emitting chip 371 may be an LED chip that emits at least one of blue, red, green, ultraviolet (UV), and infrared light, and the light emitting device 300 may emit at least one of white, blue, red, green, and infrared light. The light emitting device 300 may be, but is not limited to, a side-view type whose bottom is electrically connected to the substrate 100. As another example, the light emitting device 300 may be an LED chip or a top-view package.

[0017] The light emitting surface 381 of the light emitting device 300 is disposed on at least one side surface other than the top surface of the light emitting device 300. The light emitting surface 381 may be a side surface of the light emitting device 300 adjacent to the substrate 100 or a side surface perpendicular to the top surface of the substrate 100. The light emitting surface 381 is disposed on a side surface between the bottom surface and top surface of the light emitting device 300, and emits light with the highest intensity in the first direction X.

[0018] A portion of the light emitted through the light-emitting surface 381 of the light-emitting device 300 travels in a direction parallel to the upper surface of the substrate 100, is reflected by the reflective member 400, or travels toward the upper surface of the resin layer 500. The thickness of the light-emitting device 300 may be, for example, 3 mm or less, for example, in a range of 0.8 mm to 2 mm. The length k1 of the light-emitting device 300 in the second direction may be 1.5 times or more the thickness of the light-emitting device 300. Looking at the light distribution of the light-emitting device 300, the light-direction angle in the ±Z direction is wider than the light-direction angle in the ±Y direction. The light-direction angle of the light-emitting device 300 in the second direction Y may be 110 degrees or more, for example, in a range of 120 degrees to 160 degrees or 140 degrees to 170 degrees. The light-direction angle of the light-emitting device 300 in the third direction Z may be 110 degrees or more, for example, in a range of 120 degrees to 140 degrees.

[0019] <Reflective member 400> 1 to 6, the reflective member 400 may be a separate layer disposed on the substrate 100 or a layer protecting the upper portion of the substrate 100. The reflective member 400 may be disposed between the substrate 100 and the resin layer 500. The reflective member 400 may be provided in the form of a film made of a metallic or non-metallic material. The reflective member 400 may be adhered to the upper surface of the substrate 100. The reflective member 400 may have an area smaller than the area of ​​the upper surface of the substrate 100. The reflective member 400 is spaced from the edge of the substrate 100, and the resin layer 500 is attached to the substrate 100 in the spaced area. In this case, peeling of the edge portion of the reflective member 400 can be prevented. The reflective member 400 may have a dot-type reflective pattern disposed on the upper surface, but is not limited thereto. As shown in FIG. 6, the reflective member 400 may include an opening 410 in which the lower portion of the light emitting element 300 is disposed. The opening 410 of the reflective member 400 exposes the upper surface of the substrate 100 and accommodates a portion where a frame of the light emitting device 300 is bonded. The size of the opening 410 may be the same as or larger than the size of the light emitting device 300, but is not limited thereto. The reflective member 400 contacts the upper surface of the substrate 100 or is bonded between the resin layer 500 and the substrate 100. Here, the reflective member 400 is removed when a highly reflective material is coated on the upper surface of the substrate 100. The reflective member 400 may be formed to a thickness thinner than that of the light emitting device 300. The thickness of the reflective member 400 may be within a range of 0.2 mm ±0.02 mm. The lower portion of the light emitting device 300 penetrates through the opening 410 of the reflective member 400, and the upper portion of the light emitting device 300 protrudes. The light emitting surface 381 of the light emitting device 300 is provided perpendicular to the upper surface of the reflective member 400.

[0020] The reflective member 400 may be made of 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 plastic or resin. The resin material may include silicone or epoxy to which a reflective material, for example, a metal oxide such as TiO2, Al2O3, or SiO2, is added. The reflective member 400 may be implemented as a single layer or multiple layers, and such a layer structure may improve light reflection efficiency. The reflective member 400 according to an embodiment of the invention may reflect incident light, thereby increasing the amount of light so that the light is emitted with a uniform distribution. As another example, the reflective member 400 may be removed from the substrate 100.

[0021] <Resin layer 500> The resin layer 500 is disposed on the substrate 100. The resin layer 500 faces or is bonded to the substrate 100. The resin layer 500 is disposed on the entire upper surface or a partial area of ​​the substrate 100. The lower surface area of ​​the resin layer 500 may be the same as the upper surface area of ​​the substrate 100 or may be 80% or more of the upper surface area of ​​the substrate 100. The resin layer 500 may be made of a transparent material and may guide or diffuse light. The resin layer 500 may include a UV-curable resin material and may be used instead of a light guide plate. The UV-curable resin material has the advantage of being easy to adjust the refractive index and thickness. The resin layer 500 is mainly made of an oligomer, and is mixed with IBOA, a diluent monomer, and GMA to adjust hardness, heat resistance, and transmittance, and to enhance adhesion and oxidation resistance. The resin layer 500 may contain a photoinitiator and a light stabilizer to adjust curing and prevent discoloration. The resin layer 500 is a resin layer that guides light, and therefore can be provided with a thinner thickness than glass and as a flexible plate. The resin layer 500 can convert point light emitted from the light emitting device 300 into linear or planar light. Beads (not shown) can be included in the resin layer 500 to diffuse light. The upper part of the resin layer 500 is disposed on the light emitting device 300, thereby protecting the light emitting device 300 and reducing loss of light emitted from the light emitting device 300. The light emitting device 300 is embedded in the lower part of the resin layer 500. The resin layer 500 can be in contact with the surface of the light emitting device 300 and the light emitting surface 381 of the light emitting device 300. A portion of the resin layer 500 is disposed in the opening 410 of the reflective member 400. A portion of the resin layer 500 can be in contact with the upper surface of the substrate 100 through the opening 410 of the reflective member 400. As a result, a portion of the resin layer 500 comes into contact with the substrate 100 , so that the reflecting member 400 can be fixed between the resin layer 500 and the substrate 100 .

[0022] The thickness of the resin layer 500 may be 5 mm or less, for example, in the range of 2 mm to 5 mm. If the thickness of the resin layer 500 is greater than this range, the luminous intensity or light-blocking properties may decrease, and the increased module thickness may make it difficult to provide a flexible module. If the thickness of the resin layer 500 is less than this range, it may be difficult to provide a surface light with uniform luminous intensity. The length of the resin layer 500 in the first direction X is aligned with the first direction of the substrate 100, and the length of the resin layer 500 in the second direction Y is aligned with the second direction of the substrate 100. The resin layer 500 is positioned to be 80% or more, for example, in the range of 80% to 100%, of the length of the substrate 100 in the first and second directions. Each side of the resin layer 500 is flush with or adjacent to each side of the substrate 100. The resin layer 500 may be provided in a size that covers a plurality of light emitting elements 300, or may be connected to each other. The resin layer 500 is separated into light emitting cells each having a size sufficient to cover each light emitting device 300 and each resin layer 500. The resin layer 500 may include an optical pattern unit 600. The optical pattern unit 600 may reflect or refract incident light to suppress hot spots.

[0023] <Optical pattern unit 600> 1, 2, and 5, the optical pattern unit 600 is formed in a concave pattern on the upper surface of the resin layer 500. The concave pattern may include recesses 60 arranged with a predetermined depth on the upper surface of the resin layer 500. The optical pattern unit 600 is disposed on each of the light emitting devices 300 and may include recesses 60 formed on the upper surface of the resin layer 500 facing the substrate 100. Protrusions 70 are disposed between the recesses 60. The optical pattern units 600 are spaced apart from each other along a direction (e.g., X) in which the light emitting devices 300 are arranged. For example, a distance X2 between the optical pattern units 600 may be smaller than a distance X1 between the light emitting devices 300. The optical pattern units 600 are spaced apart from the outer surface or edge of the resin layer 500.

[0024] The first portion of the optical pattern unit 600 may be a region overlapping the light emitting device 300 in the vertical direction or the third direction Z. The second portion of the optical pattern unit 600 may be a peripheral region of the first portion and an upper region from which light is emitted relative to the first portion. The optical pattern units 600 refract or reflect light incident from the upper portion of each of the light emitting devices 300, thereby suppressing hot spots at the upper portion of each of the light emitting devices 300. As shown in FIGS. 2 and 7, each of the optical pattern units 600 may have a maximum length b2 in the second direction Y greater than a maximum length b1 in the first direction X. Each of the optical pattern units 600 is disposed within a region having a radius of 10 mm or less from the center in the major axis direction (e.g., the second direction) and a radius of 6 mm or less in the minor axis direction. The maximum length b1 of the optical pattern unit 600 in the first direction X may be 8 mm or more, for example, in the range of 8 mm to 12 mm. The maximum length b2 of the optical pattern unit 600 in the second direction Y may be 10 mm or more, for example, in the range of 10 mm to 20 mm or 12 mm to 20 mm. Each of the optical pattern units 600 may have a size corresponding to the directivity characteristic of the light emitting element 300, i.e., a characteristic in which the directivity angle in the second direction Y based on the optical axis is greater than the directivity angle in the third direction Z. As a result, the optical pattern unit 600 can effectively refract or reflect light traveling in the third direction Z based on the optical axis in front of the light emitting element 300, and can effectively refract or reflect light traveling in the second direction Y. As a result, the optical pattern unit 600 can reduce the linearity of incident light and improve light diffusion efficiency.

[0025] As shown in FIG. 2 , a width k2 of a first portion of the optical pattern unit 600 overlapping the light emitting device 300 may be greater than a length k1 of the light emitting device 300. This allows light traveling toward the upper portion of the light emitting device 300 to be effectively refracted and diffused in other directions. When the light emitting devices 300 are arranged in a first direction X, they may be defined as a first light emitting device and a second light emitting device. When the optical pattern unit 600 is arranged in the first direction X, they may be defined as a first optical pattern unit and a second optical pattern unit. The first light emitting device emits light toward the front or toward the rear of the second light emitting device, and the second light emitting device emits light toward the front. The first optical pattern unit may cover the upper surface and upper front of the first light emitting device on the upper surface of the resin layer 500, and the second optical pattern unit may cover the upper surface and upper front of the second light emitting device on the upper surface of the resin layer 500. The first and second optical pattern units may refract or reflect and diffuse light incident from the first and second light emitting devices, respectively.

[0026] In the lighting device 1000 according to an embodiment of the invention, an optical pattern unit 600 having a concavo-convex pattern is disposed on the surface of the resin layer 500, thereby eliminating the need for a separate layer for forming a light blocking member on the resin layer 500 or a structure including an adhesive layer for bonding a layer having a light blocking member to the resin layer. To diffuse light, a diffusion plate may be further provided on the resin layer 500, or an internal or external lens may be further provided. This allows the lighting device 1000 to be thin, and refracted light may travel in the directional direction of the light, improving the directional distribution.

[0027] 1 to 4, the optical pattern unit 600 includes a plurality of recesses 60, and the recesses 60 may have a polygonal shape (e.g., a triangle, a rectangle, or a pentagon) in top view, or a circular or elliptical shape. The recesses 60 may have the same or different top surface areas. The recesses 60 may be arranged with the same size in some regions, and may have different sizes in different regions. The recesses 60 are spaced apart at predetermined intervals, and the intervals may be smaller than the lengths of the recesses 60 in the first and second directions X and Y. The intervals between the recesses 60 may be the same. The intervals between the recesses 60 may include regions with a constant interval and regions with intervals smaller or larger than the constant interval. The intervals between the recesses 60 in the first direction X and the second direction Y may be the same or different.

[0028] As shown in FIGS. 2 and 3 , the optical pattern unit 600 has concave portions 60 and convex portions 70 alternately arranged in a first direction X. The optical pattern unit 600 has concave portions 60 and convex portions 70 alternately arranged in a second direction Y. The side cross section of each of the concave portions 60 may have a polygonal shape. The width of the concave portions 60 in the first direction X and / or the second direction Y may be smaller than the depth h1. The concave portions 60 may have a columnar shape with a deep depth h1. The concave portions 60 may have the same upper and lower widths. The bottoms 6 of the concave portions 60 may include flat surfaces. The upper surfaces 7 of the convex portions 70 between the concave portions 60 may have a constant width or different widths depending on the region. The convex portions 70 may be connected to each other, and the concave portions 60 may be recessed downward in the inner regions of the convex portions 70. The concave portions 60 may reflect or refract incident light and diffuse it. The convex portion 70 can reflect or refract incident light, or guide it upward and diffuse it.

[0029] As shown in FIGS. 2 and 4, each side cross section of the recess 60A of the optical pattern unit 600 may have a columnar shape. The lower portion of the recess 60A may be hemispherical, and the bottom 6A may include a concave curved surface. The width of the recess 60A in the first and / or second directions may be smaller than the depth h1. The upper width of the recess 60A may be larger than the minimum width at the bottom. The upper surfaces 7A of the convex portions 70A between the recesses 60A may have a constant width or may have different widths depending on the region. The convex portions 70A may be connected to each other, and the recess 60A may be recessed downward within the convex portion 70A. The curvature of the curved surface of the recess 60A may be 0.08 or more, for example, in the range of 0.08 to 0.12. The curved surface having such a curvature may improve the output efficiency of incident light. The curvature of the recess 60A may be the curvature between the bottom 6A and the side surface, or the curvature of the corners between the side surfaces within the recess 60A. The width of the recess 60A may be 0.25 mm or more, and may be in the range of, for example, 0.25 mm to 0.45 mm.

[0030] Referring to FIG. 4, the angle at which light incident on the concave curved surface of the recess 60A is refracted and the angle at which the light is emitted for light extraction are expressed by Equations 1 to 3.

[0031] 90-θ4=asin(1.47sin(90-θ3))...Equation 1 47.1°<90-θ3<90°...Equation 2 0°<90-θ3<47.1°...Equation 3 Here, 1.47 is the refractive index of the resin layer 500. The angle θ3 is the angle of the incident light with respect to the tangent line passing through the curved surface of the recess 60A, the angle θ4 is the angle of the refracted light with respect to the tangent line passing through the curved surface of the recess 60A, and the angle θ5 is the angle between the light passing through the recess 60A and the horizontal upper surface of the resin layer 500. The angle θ5 may be in the range of 35±15 degrees. The condition of Equation 2 is the angle at which the light entering the recess 60A is totally reflected, thereby reducing the light transmittance. Here, the bottom curvature of the recess 60A is designed taking into account the critical angle of the material of the resin layer 500. The condition of Equation 3 is the angle at which the light entering the recess 60A is transmitted, at which the light is refracted and emitted to the outside. The angle θ5 between the refracted and transmitted light and the horizontal upper surface of the resin layer 500 increases the efficiency of the light emitted from the light emitting device 300 in the forward direction, thereby providing the light distribution directionality of the lighting device. That is, when a lighting device is disposed on the rear side of a vehicle lamp, the light emitted from the light emitting device 300 is emitted at the angle θ5. Therefore, the lighting device disposed on the rear side of a vehicle lamp can provide the light distribution directionality that travels backward.

[0032] 3 and 4, the depth h1 of the recesses 60, 60A of the optical pattern unit 600 may be 0.25 mm or more, for example, in the range of 0.25 mm to 0.8 mm. The depth h1 of the recesses 60, 60A of the optical pattern unit 600 may be constant or may vary depending on the region. For example, if the depth h1 of the recesses 60, 60A varies depending on the region, a first region adjacent to the light emitting device 300 may be deep, and a second region farther from the light emitting device 300 may be shallower than the first region. The recesses 60, 60A may be formed by etching or by a molding process of the resin layer 500.

[0033] 7 to 9 show the configuration of an optical pattern portion according to a first embodiment of the invention.

[0034] 7 to 9, the optical pattern unit 600 may have a maximum length b2 in the second direction Y greater than the maximum length b1 in the first direction X. For example, the maximum length b2 in the second direction Y may be 120% or more, for example, 120% to 180%, of the maximum length b1 in the first direction X. The area of ​​a region formed by connecting the outermost patterns of the optical pattern unit 600 may be 6 times or more, for example, 6 to 18 times, the area of ​​the top surface of the light emitting device 300. Thus, the optical pattern unit 600 may cover the upper and front areas of the light emitting device 300 and reflect or refract incident light. The optical pattern unit 600 may have widths w1, w2, w3, and w4 that are different from each other and are arranged in the first direction X. The pattern units 610, 620, 630, and 640 extend in the second direction Y. For example, the plurality of pattern units 610, 620, 630, and 640 may be arranged at the same depth h1, and pitches P1, P2, P3, and P4 between adjacent recesses 61, 62, 63, and 64 in the first and second directions X and Y may be the same or may increase as they move away from the light-emitting surface 381 of the light-emitting device 300. Each of the plurality of pattern units 610, 620, 630, and 640 includes recesses 61, 62, 63, and 64 and protrusions 71, 72, 73, and 74, and the recesses 61, 62, 63, and 64 and the protrusions 71, 72, 73, and 74 are alternately arranged. The intermediate convex portions 77, 78, 79 between the plurality of pattern portions 610, 620, 630, 640 may be larger than at least two of the widths w1, w2, w3, w4 of the adjacent concave portions 61, 62, 63, 64, and may be equal to or larger than at least one of the widths of the adjacent convex portions 71, 72, 73, 74.

[0035] The optical pattern unit 600 may be arranged in the order of a first pattern unit 610, a second pattern unit 620, a third pattern unit 630, and a fourth pattern unit 640 in the first direction X from the center of a position where the light emitting element 300 is placed. The optical pattern unit 600 may be arranged in the order of a first pattern unit 610, a second pattern unit 620, a third pattern unit 630, and a fourth pattern unit 640 on both sides in the second direction Y from the position where the light emitting element 300 is placed or the center of the optical pattern unit 600. Intermediate convex units 77, 78, and 79 are arranged between the first to fourth pattern units 610, 620, 630, and 640, respectively. In the first to fourth pattern units 610, 620, 630, and 640, concave units 61, 62, 63, and 64 and convex units 71, 72, 73, and 74 are alternately arranged. The first pattern portion 610 may include a plurality of first recesses 61 and a plurality of first protrusions 71, and a width w1 of the first recesses 61 may be greater than a width of the first protrusions 71 arranged between the first recesses 61. The second pattern portion 620 may include a plurality of second recesses 62 and a plurality of second protrusions 72, and a width w2 of the second recesses 62 may be greater than a width of the second protrusions 72 arranged between the second recesses 62.

[0036] The third pattern portion 630 may include a plurality of third recesses 63 and a plurality of fourth protrusions 73, and a width w3 of the third recesses 63 may be smaller than a width of the third protrusions 73 disposed between the third recesses 63. The fourth pattern portion 640 may include a plurality of fourth recesses 64 and at least one fourth protrusion 74, and a width of the fourth recesses 64 may be smaller than a width of the fourth protrusions 74 disposed between the fourth recesses 64.

[0037] Based on the position overlapping with the center of the light-emitting element 300, the widths w1, w2, w3, and w4 of the first to fourth concave portions 61, 62, 63, and 64 gradually decrease in the first direction X. From the position overlapping with the center of the light-emitting element 300 or the center of the optical pattern portion 600, the widths w1, w2, w3, and w4 of the first to fourth concave portions 61, 62, 63, and 64 gradually decrease on both sides in the second direction Y. For example, the widths of the first to fourth concave portions 61, 62, 63, and 64 can satisfy w1 > w2 > w3 > w4. The width w1 is 0.4 mm or more, for example, in the range of 0.4 mm to 0.6 mm. The width w2 is less than 0.4 mm, for example, in the range of 0.32 mm to 0.39 mm. The width w3 is 0.3 mm or less, for example, in the range of 0.29 mm to 0.38 mm. The width w4 may be 0.2 mm or more, for example, in the range of 0.2 mm to 0.28 mm. The width w1 of the first concave portion 61 may be at least twice the width w4 of the fourth concave portion 64. The widths d1, d2, and d3 of the intermediate convex portions 77, 78, and 79 can satisfy d1 < d2 < d3, and may be at least 0.01 mm and at most 0.5 mm. That is, the maximum width d3 is in the range of 0.4 mm to 0.5 mm, and the minimum width d1 can have a range of 0.01 to 0.2 mm. Such a minimum width d1 is a range in which a concave portion can be etched or formed between the convex portions 77.

[0038] The depth h1 of the first to fourth concave portions 61, 62, 63, and 64 may be 0.25 mm or more, for example, in the range of 0.25 mm to 0.35 mm. When the upper surface area of the optical pattern portion 600 is 100%, the upper surface area of the first pattern portion 610 may be in the range of 40% ± 5% with respect to the upper surface area of the optical pattern portion 600. The upper surface area of the second pattern portion 620 may be in the range of 25% ± 4% with respect to the upper surface area of the optical pattern portion 600. The upper surface area of the third pattern portion 630 may be in the range of 20% ± 3% with respect to the upper surface area of the optical pattern portion 600. The upper surface area of the fourth pattern portion 640 can have a range of 15% ± 3% with respect to the upper surface area of the optical pattern portion 600.

[0039] In the first example, the optical pattern unit 600 having the plurality of pattern units 610, 620, 630, and 640 may have the same depth h1, and the width of the pattern units having the recesses 61, 62, 63, and 64 may be gradually reduced as they are positioned further away from the center of the light emitting device 300. As a result, the area of ​​the recesses of the first pattern unit 610 is the largest in the area adjacent to the light emitting device 300, and the area of ​​the recesses decreases as they are positioned further away, allowing a pattern to be disposed that can diffuse light in proportion to the light intensity.

[0040] 10 to 12 are diagrams showing an optical pattern unit according to a second example.

[0041] 10 to 12, the optical pattern unit 600A disposed on the resin layer 500 may have a maximum length b4 in the second direction Y greater than a maximum length b3 in the first direction X. For example, the maximum length b4 in the second direction Y may be 200% or more, for example, 200% to 330%, of the maximum length b3 in the first direction X. The maximum length b3 in the first direction X may be equal to or greater than the length k1 (FIG. 2) of the light emitting device 300. For example, the maximum length b3 in the first direction X may be 3.5 mm or less, for example, 2.5 mm to 3.5 mm, and the maximum length b4 in the second direction Y may be 7 mm or more, for example, 7 mm to 9 mm. The area of ​​a region connecting the outermost patterns of the optical pattern unit 600 may be 1 time or more, for example, 1 time to 3 times, the area of ​​the top surface of the light emitting device 300. Therefore, the optical pattern unit 600A covers the upper and front areas of the light emitting device 300 and can reflect or refract incident light.

[0042] The optical pattern unit 600A may have different widths w1 and w2 of the pattern units 610 and 620 arranged in the first direction X. The pattern units 610 and 620 extend in the second direction Y. For example, the pattern units 610 and 620 may be arranged at the same depth h2, and the pitches p1 and p2 between adjacent recesses 62 in the first and second directions X and Y may be the same or gradually increasing. Each of the pattern units 610 and 620 includes recesses 61 and 62 and protrusions 71 and 72, which are alternately arranged. An intermediate protrusion 77 between the patterns may be larger than the widths w1 and w2 of adjacent recesses 61 and 62 and may be the same or larger than the width of at least one adjacent protrusion 71. The optical pattern unit 600A has a first pattern unit 610 and a second pattern unit 620 arranged in a first direction, and an intermediate convex unit 77 arranged between the first and second pattern units 610 and 620. In each of the first and second pattern units 61 and 620, concave units 61 and 62 and convex units 71 and 72 are alternately arranged.

[0043] The first pattern portion 610 may include a plurality of first recesses 61 and a plurality of first protrusions 71, and a width w1 of the first recesses 61 may be greater than a width of the first protrusions 71 arranged between the first recesses 61. The second pattern portion 620 may include a plurality of second recesses 62 and a plurality of second protrusions 72, and a width w2 of the second recesses 62 may be greater than a width of the second protrusions 72 arranged between the second recesses 62.

[0044] The widths w1 and w2 of the first recess 61 and the second recess 62 gradually decrease in the first direction X from a position overlapping the center of the light emitting element 300. The widths w1>w2 of the first recess 61 and the second recess 62 arranged on both sides in the second direction Y gradually decrease from a position overlapping the center of the light emitting element 300 or the center of the optical pattern unit 600A. For example, the widths of the first and second recesses 61 and 62 may satisfy w1>w2. The width w1 may be 0.4 mm or more, for example, in the range of 0.4 mm to 0.6 mm, and the width w2 may be less than 0.4 mm, for example, in the range of 0.25 mm to 0.39 mm. The width w1 of the first recess 61 may be less than twice the width w2 of the second recess 62. The width d1 of the intermediate convex portion 77 may be in the range of 0.01 mm to 0.5 mm and may be larger than the widths of the first and second convex portions 71 and 72. The depth h2 of the first and second recesses 61 and 62 may be 0.4 mm or more, for example, in the range of 0.4 mm to 0.5 mm. When the top surface area of ​​the optical pattern unit 600A is 100%, the top surface area of ​​the first pattern unit 610 may be in the range of 80%±5% of the top surface area of ​​the optical pattern unit 600A, and the top surface area of ​​the second pattern unit 620 may be in the range of 20%±4% of the top surface area of ​​the optical pattern unit 600A.

[0045] In the second example, the depth h2 of the optical pattern unit 600A having the plurality of pattern units 610 and 620 may be deeper than the depth h1 of the first example and may be the same, and may be provided with a width that gradually decreases as it moves away from the position overlapping with the center of the light emitting device 300. As a result, the area of ​​the first recesses 61 of the pattern units 610 and 620 is largest in the region adjacent to the light emitting device 300, and the area of ​​the second recesses 62 decreases as it moves away from the light emitting device 300, allowing a pattern that can diffuse light in proportion to the light intensity to be disposed.

[0046] 13 to 15 are diagrams showing an optical pattern unit according to a third example.

[0047] 13 to 15, the optical pattern unit 600B disposed on the resin layer 500 may have a maximum length b6 in the second direction Y greater than a maximum length b5 in the first direction X. For example, the maximum length b6 in the second direction Y may be 100% or more, for example, 100% to 150%, of the maximum length b5 in the first direction X. The maximum length b5 in the first direction X may be 80% or more, for example, 80% to 110% of the length k1 (FIG. 2) of the light emitting device 300. For example, the maximum length b5 in the first direction X may be 2.5 mm or less, for example, 1.8 mm to 2.5 mm, and the maximum length b6 in the second direction Y may be 7 mm or more, for example, 7 mm to 9 mm. The area of ​​a region formed by connecting the outermost patterns of the optical pattern unit 600B may be 0.5 times or more, for example, 0.5 to 1.5 times, the area of ​​the top surface of the light emitting device 300. Therefore, the optical pattern unit 600B covers the upper and front areas of the light emitting device 300 and can reflect or refract incident light.

[0048] In the optical pattern unit 600B, the widths w1 and w2 of the plurality of pattern units 610 and 620 arranged in the first direction X may be different. The plurality of pattern units 610 and 620 extend in the second direction Y. For example, the plurality of pattern units 610 and 620 may be arranged to the same depth h3, and the pitch p1 between adjacent recesses 62 in the first and second directions X and Y may be the same. Each of the plurality of pattern units 610 and 620 includes recesses 61 and 62 and protrusions 71 and 72, and the recesses 61 and 62 and the protrusions 71 and 72 are alternately arranged. An intermediate protrusion 77 between the plurality of pattern units 610 and 620 may be smaller than the width w1 of at least one of the adjacent recesses 61 and 62 and larger than the width of the adjacent protrusions 71 and 72. The optical pattern unit 600B includes a first pattern unit 610 and a second pattern unit 620 arranged in a first direction, and an intermediate convex unit 77 arranged between the first and second pattern units 610 and 620. The first and second pattern units 610 and 620 have concave portions 61 and 62 and convex portions 71 and 72 arranged alternately in the first and second directions. The first pattern unit 610 includes a plurality of first concave portions 61 and a plurality of first convex portions 71, and a width w1 of the first concave portions 61 may be greater than a width of the first convex portions 71 arranged between the first concave portions 61. The second pattern unit 620 includes a plurality of second concave portions 62 and a plurality of second convex portions 72, and a width w2 of the second concave portions 62 may be the same as or different from a width of the second convex portions 72 arranged between the second concave portions 62. The widths w1 and w2 of the first concave portions 61 and the second concave portions 62 gradually decrease in the first direction X from a position overlapping the center of the light emitting device 300. The widths w1>w2 of the first recess 61 and the second recess 62 arranged on both sides in the second direction Y at a position overlapping the center of the light emitting element 300 or the center of the optical pattern unit 600B gradually decrease. For example, the widths of the first and second recesses 61, 62 may satisfy w1>w2. The width w1 may be 0.4 mm or more, for example, in the range of 0.4 mm to 0.6 mm, and the width w2 may be less than 0.4 mm, for example, in the range of 0.25 mm to 0.39 mm. The width w1 of the first recess 61 may be two times or less the width w2 of the second recess 62.The width d1 of the intermediate convex portion 77 may be in the range of 0.01 mm to 0.5 mm, and may be larger than the widths of the first and second convex portions 71 and 72.

[0049] The depth h3 of the first and second recesses 61 and 62 may be 0.55 mm or more, for example, in the range of 0.55 mm to 0.65 mm. When the top surface area of ​​the optical pattern unit 600B is 100%, the top surface area of ​​the first pattern unit 610 may be in the range of 85%±5% of the top surface area of ​​the optical pattern unit 600B, and the top surface area of ​​the second pattern unit 620 may be in the range of 15%±4% of the top surface area of ​​the optical pattern unit 600B.

[0050] In the third example, the depth h3 of the optical pattern unit 600B having the plurality of pattern units 610 and 620 may be deeper than and equal to the depth h2 of the second example, and may be provided with a width that gradually decreases as it moves away from the position overlapping with the center of the light emitting device 300. As a result, the area of ​​the first recesses 61 of the pattern units 610 and 620 is largest in the region adjacent to the light emitting device 300 and decreases like the area of ​​the second recesses 62 located in the far region, allowing a pattern that can diffuse light in proportion to the light intensity to be disposed.

[0051] 16 and 17 are diagrams showing an optical pattern unit according to a fourth embodiment.

[0052] 2, 16, and 17, the maximum length b2 of the optical pattern unit 600C in the second direction Y may be greater than the maximum length b1 in the first direction X. For example, the maximum length b2 in the second direction Y may be 120% or more, for example, in a range of 120% to 180%, of the maximum length b1 in the first direction X. The area of ​​a region formed by connecting the outermost patterns of the optical pattern unit 600C may be 6 times or more, for example, in a range of 6 to 18 times, the area of ​​the top surface of the light emitting device 300. Thus, the optical pattern unit 600C can cover the upper and front regions of the light emitting device 300 and reflect or refract incident light.

[0053] In the optical pattern unit 600C, the widths w1, w2, w3, and w4 of the plurality of pattern units 610, 620, 630, and 640 arranged in the first direction X may be different. The plurality of pattern units 610, 620, 630, and 640 extend in the second direction. For example, the plurality of pattern units 610, 620, 630, and 640 may be arranged at different depths h1, h2, h3, and h4, and the pitches P1, P2, P3, and P4 between the recesses 62 adjacent in the first and second directions may be different from each other.

[0054] Each of the plurality of pattern portions 610, 620, 630, and 640 includes recesses 61, 62, 63, and 64 and protrusions 71, 72, 73, and 74, and the recesses 61, 62, 63, and 64 and the protrusions 71, 72, 73, and 74 are alternately arranged. Intermediate protrusions 77, 78, and 79 between the plurality of pattern portions 610, 620, 630, and 640 may have widths d1, d2, and d3 that are smaller than the widths w1 and w2 of the adjacent first and second recesses 61 and 62, and may have widths d1, d2, and d3 that are larger than the widths w3 and w4 of the adjacent third and fourth recesses 63 and 64. The widths d1, d2, d3 of the intermediate protrusions 77, 78, 79 may be smallest, with the width d1 of the first intermediate protrusion 77 between the first and second pattern portions 610, 620 being the smallest, and the width d3 of the third intermediate protrusion 79 between the third and fourth pattern portions 630, 640 being the largest. In this configuration, the widths d1, d2, d3 of the intermediate protrusions 77, 78, 79 can be set in consideration of the widths w1, w2, w3, w4 of the recesses 61, 62, 63, 64 and the pitches P1, P2, P3, P4.

[0055] The optical pattern unit 600C has a first pattern unit 610, a second pattern unit 620, a third pattern unit 630, and a fourth pattern unit 640 arranged in this order in the first direction X, and has the first pattern unit 610, the second pattern unit 620, the third pattern unit 630, and the fourth pattern unit 640 arranged in this order on both sides in the second direction Y. Intermediate convex units 77, 78, and 79 are arranged between the first to fourth pattern units 610, 620, 630, and 640, respectively. In each of the first to fourth pattern units 610, 620, 630, and 640, concave units 61, 62, 63, and 64 and convex units 71, 72, 73, and 74 are alternately arranged in the first and second directions X and Y. The first pattern portion 610 may include a plurality of first recesses 61 and a plurality of first protrusions 71, and a width w1 of the first recesses 61 may be greater than a width of the first protrusions 71 arranged between the first recesses 61. The second pattern portion 620 may include a plurality of second recesses 62 and a plurality of second protrusions 72, and a width w2 of the second recesses 62 may be greater than a width of the second protrusions 72 arranged between the second recesses 62.

[0056] The third pattern portion 630 may include a plurality of third recesses 63 and a plurality of third protrusions 73, and a width w3 of the third recesses 63 may be smaller than a width of the third protrusions 73 disposed between the third recesses 63. The fourth pattern portion 640 may include a plurality of fourth recesses 64 and at least one fourth protrusion 74, and a width w4 of the fourth recesses 64 may be smaller than a width of the fourth protrusions 74 disposed between the fourth recesses 64.

[0057] Based on the position overlapping the center of the light-emitting element 300, the widths w1, w2, w3, w4 of the first concave portion to the fourth concave portions 61, 62, 63, 64 gradually decrease as they go farther in the first direction X. From the position overlapping the center of the light-emitting element 300 or the center of the optical pattern portion 600C, the widths w1, w2, w3, w4 of the first concave portion to the fourth concave portions 61, 62, 63, 64 gradually decrease as they go farther from both sides in the second direction Y. For example, the widths of the first to fourth concave portions 61, 62, 63, 64 can satisfy w1>w2>w3>w4. The width w1 is 0.4 mm or more, for example, in the range of 0.4 mm to 0.6 mm, the width w2 is less than 0.4 mm, for example, in the range of 0.32 mm to 0.39 mm, the width w3 is 0.3 mm or less, for example, in the range of 0.29 mm to 0.38 mm, and the width w4 may be 0.2 mm or more, for example, in the range of 0.2 mm to 0.28 mm. The width w1 of the first concave portion may be twice or more the width w4 of the fourth concave portion. The widths d1, d2, d3 of the intermediate convex portions 77, 78, 79 can satisfy d1<d2<d3, and may be at least 0.01 mm and at most 0.5 mm. That is, the maximum width d3 is in the range of 0.4 mm to 0.5 mm, and the minimum width d1 may be in the range of 0.01 to 0.2 mm. Such a minimum width d1 is the range in which a concave portion can be etched or formed between the convex portions 77. The depths h1, h2, h3 of the first to fourth concave portions 61, 62, 63, the depths h1 of the third or fourth concave portions 63, 64 may be the same as each other, or the third concave portion 63 may be deeper. The depths h1 of the third or fourth concave portions 63, 64 may be smaller than the depths h3, h2 of the first and second concave portions 61, 62. The depth h3 of the first concave portion 61 may be larger than the depth h2 of the second concave portion 62.

[0058] The depths h3, h2, and h1 of the first to fourth recesses 61, 62, 63, and 64 gradually decrease with increasing distance in the first direction X from a position overlapping the center of the light emitting element 300. The depths h3, h2, and h1 of the first to fourth recesses 61, 62, 63, and 64 gradually decrease with increasing distance in the second direction Y from the position overlapping the center of the light emitting element 300 or the center of the optical pattern unit 600C. The depth h1 of the third and fourth recesses 63 and 64 may be 0.25 mm or more, for example, in the range of 0.25 mm to 0.35 mm. The depth h2 of the second recess 62 may be 0.4 mm or more, for example, in the range of 0.4 mm to 0.5 mm. The depth h3 of the first recess 61 may be 0.55 mm or more, for example, in the range of 0.55 mm to 0.65 mm. When the top surface area of ​​the optical pattern unit 600 is 100%, the top surface area of ​​the first pattern unit 610 may be in the range of 40%±5% of the top surface area of ​​the optical pattern unit 600C, the top surface area of ​​the second pattern unit 620 may be in the range of 25%±4% of the top surface area of ​​the optical pattern unit 600C, the top surface area of ​​the third pattern unit 630 may be in the range of 20%±3% of the top surface area of ​​the optical pattern unit 600C, and the top surface area of ​​the fourth pattern unit 640 may have a range of 15%±3% of the top surface area of ​​the optical pattern unit 600C.

[0059] In the fourth example, the depths h1, h2, and h3 of the optical pattern unit 600C having the plurality of pattern units 610, 620, 630, and 640 may be deepest at a position overlapping the center of the light emitting device 300 and gradually decrease in depth as they move away from the center of the light emitting device 300, or may be gradually decreased in width as they move away from the position overlapping the center of the light emitting device 300. As a result, the area and depth of the recesses 61 of the first pattern unit 610 are largest in the region adjacent to the light emitting device 300 and the area and depth decrease as they move away from the center of the light emitting device 300, so that a pattern that can diffuse light in proportion to the light intensity can be disposed.

[0060] Table 1 shows an example of an experiment comparing the brightness of a structure without an optical pattern (comparative example) with that of modules having an optical pattern portion such as the first to third examples of the invention. [Table 1]

[0061] As in the above experimental examples, the comparative example without an optical pattern had the lowest maximum and median brightness values, meaning that the incident light was totally reflected and traveled inside the resin layer. The brightness of the first example increased both in maximum and median values, which reduced the amount of light totally reflected by the optical pattern and improved light extraction efficiency. The brightness of the second example increased in maximum value, increasing the amount of light emitted from the entire area. The brightness of the third example increased in maximum value, increasing the amount of light emitted from the entire area. This improved light uniformity and increased the amount of light refracted by the optical pattern without the need to place a separate light-blocking member on the resin layer with the optical pattern.

[0062] Figure 18 (a), (b), and (c) show the directional light distributions of Examples 1 to 3, and (d) shows the directional light distribution of a comparative example without an optical pattern. The luminous intensity (flux) distribution was measured at an angle of 35 degrees, based on the horizontal direction passing through the center of the light-emitting element. Looking at the luminous intensity, Figure 18 (a), (b), and (c) show that the detected luminous intensity is 24 cd or more, while (d) shows that the detected luminous intensity is about 20.5 cd, which is lower than the example of the invention.

[0063] FIG. 19 is a plan view of a vehicle to which the lighting device according to the embodiment of the invention is applied, and FIG. 20 is a view showing an example of a taillight of the vehicle of FIG.

[0064] 19 and 20, in a moving body or vehicle 900, a front lamp 850 may include one or more lighting modules, and the activation timing of these lighting modules may be individually controlled to provide not only a normal headlight function but also additional functions such as a welcome light or a celebration effect when a driver opens a vehicle door. The lamp may be applied to daytime running lights, high beams, low beams, fog lights, or turn signals. In the vehicle 900, a tail light 800 is arranged with a number of lamp units 810, 812, 814, and 816 supported by a housing. For example, the lamp units 810, 812, 814, and 816 may include a first lamp unit 810 arranged on the outside, a second lamp unit 814 arranged around the inside of the first lamp unit 810, and third and fourth lamp units 814 and 816 arranged inside the second lamp unit 814, respectively. The first to fourth lamp units 810, 812, 814, and 816 may selectively be applied to the lighting devices disclosed in the embodiments, and red or white lens covers may be disposed on the exterior of the lighting devices to suit the lighting characteristics of the lamp units 810, 812, 814, and 816. The lighting devices disclosed in the embodiments, when applied to the lamp units 810, 812, 814, and 816, may emit surface light with a uniform distribution. The first and second lamp units 810 and 812 may have at least one of a curved shape, a linear shape, an angular shape, an inclined shape, and a flat shape, or a combination thereof. One or more of the first and second lamp units 810 and 812 may be disposed in each tail light. The first lamp unit 810 may be used as a tail light, the second lamp unit 812 as a brake light, the third lamp unit 814 as a backup lamp, and the fourth lamp unit 816 as a turn signal lamp. Such an illumination lamp can provide higher luminous intensity in the rear direction than in the side direction, and conforms to the light distribution regulations for stop lamps or tail lamps.

[0065] The features, structures, effects, etc. described in the above embodiments are included in at least one embodiment of the present invention and are not necessarily limited to one embodiment. Furthermore, the features, structures, effects, etc. exemplified in each embodiment may be combined or modified with other embodiments by a person skilled in the art to which the embodiment belongs. Therefore, such combinations and modifications should be construed as falling within the scope of the present invention. Furthermore, while the above description focuses on the embodiments, these are merely examples and do not limit the present invention. A person skilled in the art to which the present invention belongs may make various modifications and applications not exemplified above within the scope of the present embodiments, provided that such modifications and applications do not deviate from the essential characteristics of the present embodiments. For example, each component specifically presented in the embodiments may be modified. Such modifications and variations should be construed as falling within the scope of the present invention, as defined by the appended claims.

Claims

1. A substrate; a reflecting member disposed on the substrate; a light-emitting element disposed on the substrate; a resin layer disposed on the reflector and sealing the light-emitting element; an optical pattern portion having a plurality of concave recesses on the upper surface of the resin layer and convex portions arranged between the plurality of concave recesses, the light-emitting element emits light through the resin layer in a first direction; the optical pattern unit includes a plurality of pattern units in which the recesses are arranged on both sides of the first direction and a second direction perpendicular to the first direction at positions overlapping the light emitting elements, the plurality of recesses are arranged on both sides of the protrusion in the first direction and on both sides of the protrusion in the second direction, the optical pattern portion includes an intermediate convex portion disposed between the plurality of pattern portions, a width of an upper surface of the intermediate convex portion in the first direction is larger than a width of an upper surface of the convex portion of the optical pattern portion in the first direction; Each of the recesses has an open area through which incident light is refracted and emitted.

2. a plurality of the light emitting elements are arranged in the first direction; The optical pattern unit is arranged in a plurality of pieces in the first direction, Each of the plurality of optical pattern units includes a pattern unit in which widths of the recesses arranged in the first direction decrease from positions overlapping with centers of the respective plurality of light emitting elements, Each of the plurality of optical pattern units includes a pattern unit in which the width of the recesses arranged on both sides of the center of each optical pattern unit in a second direction perpendicular to the first direction decreases, the intervals between the plurality of optical pattern units are smaller than the intervals between the plurality of light emitting elements, The lighting device according to claim 1 , wherein each of the plurality of optical pattern portions has a maximum length in the first direction that is smaller than a maximum length in the second direction.

3. The lighting device according to claim 1 , wherein a depth of the recesses arranged in the first direction is smaller than a width of an upper surface of the protrusions in the first direction.

4. The lighting device according to claim 1 , wherein the width of the upper surface of the intermediate convex portion in the first direction is greater than the width of the upper surface of the convex portion in the first direction and is 0.4 mm or more.

5. The lighting device according to claim 2 , wherein a width of the recessed portion of each of the first pattern portions adjacent to each of the light emitting elements among the plurality of pattern portions is greater than a width of the protruding portion.

6. The lighting device of claim 2 , wherein a width of the concave portion of the second pattern portion farthest from the center of the light emitting element is equal to or smaller than a width of the convex portion of the second pattern portion.

7. The lighting device according to claim 1 , wherein the plurality of recesses arranged in the optical pattern portion have the same depth.

8. the plurality of recesses arranged in the optical pattern portion have different depths, 7. The lighting device according to claim 1, wherein the depths of the plurality of recesses are the largest in a first pattern portion arranged on the upper part of the light-emitting element and the smallest in a second pattern portion arranged on the outer periphery of the optical pattern portion.

9. the recess is a polygonal pillar or a pillar having a curved surface at the bottom, 9. The lighting device according to claim 1, wherein the depth of the recess is in the range of 0.25 mm to 0.8 mm.

10. Each of the plurality of optical pattern portions is spaced apart from an outer surface or edge of the resin layer, 10. The lighting device according to claim 2, wherein the width of the upper surface of the intermediate convex portion arranged between the plurality of pattern portions in the first direction is the same as the width of the upper surface of the intermediate convex portion arranged between the plurality of pattern portions in the second direction.

11. Each of the plurality of optical pattern portions is disposed above each of the plurality of light-emitting elements, 11. The lighting device according to claim 2, wherein the area of ​​each of the optical pattern portions is in the range of 6 to 18 times the area of ​​the top surface of each of the light emitting elements.

12. The lighting device according to claim 1 , wherein the protrusions arranged between the recesses of the optical pattern portion are connected to each other within the pattern portion.

13. The lighting device according to claim 1 , wherein the pitch between adjacent recesses in the first and second directions increases with increasing distance from the light-emitting surface of the light-emitting element.

14. The lighting device according to claim 1 , wherein the width of the upper surface of the recess is 0.25 mm or more.

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