Illumination module and illumination device including the same

Abstract

The lighting device disclosed in the embodiments of the invention includes a substrate, a plurality of light sources arranged on the substrate, a resin layer arranged on the substrate and the plurality of light sources, and a first reflective layer arranged on the resin layer, wherein the resin layer includes an exit surface facing the light sources, the exit surface of the resin layer includes a plurality of convex portions, the plurality of light sources are arranged on an imaginary curve, and a line passing through the centers of the adjacent first and second light sources and the centers of each convex portion is arranged at an obtuse angle with respect to the line connecting the adjacent first and second light sources.

Description

[Technical field]

[0001] The embodiments of the invention relate to a lighting module having a plurality of light sources and a lighting device having the same. The embodiments of the invention relate to a lighting module providing a line-shaped surface light source. The embodiments of the invention relate to a lighting device having the lighting module. The embodiments of the invention relate to a light unit, a liquid crystal display device, and a vehicle lamp having the lighting module. [Background technology]

[0002] Lighting includes not only vehicle lighting but also backlights for displays and signboards. Light-emitting diodes (LEDs) have advantages such as low power consumption, semi-permanent lifespan, fast response speed, safety, and environmental friendliness compared to existing light sources such as fluorescent lamps and incandescent lamps. Such light-emitting devices are applied to various display devices and various lighting devices such as interior and exterior lights. Recently, lamps using light-emitting devices such as light-emitting diodes as vehicle light sources have been proposed. Light-emitting devices are advantageous in that they consume less power than incandescent lamps. However, since the emission angle of light emitted from the light-emitting devices is small, there is a demand for an increase in the light-emitting area of ​​lamps using the light-emitting devices when the light-emitting devices are used as vehicle lamps. Light-emitting devices are small in size, which allows for greater freedom in lamp design, and are also economical due to their semi-permanent lifespan. Summary of the Invention [Problem to be solved by the invention]

[0003] An embodiment of the invention provides a lighting module that irradiates a line-shaped surface light in one direction, and a lighting device having the same. An embodiment of the invention provides a lighting module that provides light emitted from a plurality of light sources as a line-shaped light source or a surface light source, and a device having the same. An embodiment of the invention provides a lighting device in which a light source and a resin layer are disposed between a substrate and a reflective layer, and light is irradiated in one direction of the resin layer. An embodiment of the invention provides a lighting device in which a resin layer having a light source is disposed between a plurality of reflective layers. An embodiment of the invention provides a lighting device in which a light source and a resin layer are disposed between a plurality of reflective layers, and a light extraction structure is provided on one surface of the resin layer. An embodiment of the invention provides a lighting device in which a light source and a resin layer are disposed between a plurality of reflective layers, and a convex portion and a recess portion are disposed on the reflective layer and one surface of the resin layer. An embodiment of the invention may provide a light unit, a liquid crystal display device, and a vehicle lamp having a lighting module. [Means for solving the problem]

[0004] An illumination device according to an embodiment of the invention includes a substrate, a plurality of light sources disposed on the substrate, a resin layer disposed on the substrate and the plurality of light sources, and a first reflective layer disposed on the resin layer, the resin layer including an exit surface facing the light sources, the exit surface of the resin layer including a plurality of convex portions, the plurality of light sources being disposed on a virtual curve and including a first light source and a second light source adjacent to each other, the plurality of convex portions including a first convex portion facing the first light source and a second convex portion facing the second light source, a first virtual straight line passing through a center of a circle formed by the first convex portion at a first point where the first light source and the virtual curve are tangent to each other, and a second virtual straight line passing through a center of a circle formed by the second convex portion at a second point where the second light source and the virtual curve are tangent to each other are parallel to each other, and an angle formed by the first straight line and a first tangent line tangent to the virtual curve at the first point may include a first obtuse angle.

[0005] An illumination device according to an embodiment of the invention includes a substrate, a light source disposed on the substrate, a resin layer disposed on the substrate and the light source, and a first reflective layer disposed on the resin layer, the resin layer including an exit surface facing the light source, the light source including a plurality of light-emitting elements, the exit surface of the resin layer including a plurality of convex portions corresponding to each of the plurality of light-emitting elements, each of the plurality of light-emitting elements being disposed on a virtual curve, and a difference in diameter between each of the virtual circles formed by each of the plurality of convex portions being within 10%.

[0006] An illumination device according to an embodiment of the invention includes a substrate, a light source disposed on the substrate, a resin layer disposed on the substrate and the light source, and a first reflective layer disposed on the resin layer, the resin layer including an exit surface facing the light source, the light source including a plurality of light-emitting elements, the exit surface of the resin layer including a plurality of convex portions corresponding to each of the plurality of light-emitting elements, each of the plurality of light-emitting elements being disposed on a virtual curve and including a plurality of straight lines passing through the center of a virtual circle formed by each of the plurality of light-emitting elements and each of the plurality of convex portions, and a first angle formed by each of the plurality of straight lines and each of the tangents at the points where each of the plurality of light-emitting elements touches the virtual curve includes a region that increases in one direction.

[0007] According to an embodiment of the invention, an angle formed by a second tangent line tangent to the virtual curve at the second point and the second straight line may include a second obtuse angle, and the second obtuse angle may be larger than the first obtuse angle. The plurality of light sources includes a third light source disposed on the virtual curve, the plurality of convex portions includes a third convex portion facing the third light source, and a virtual third straight line passing through a center of a circle formed by the third convex portion at a third point where the third light source and the virtual curve are tangent to the virtual curve at the third point and the second straight line may be parallel, and an angle formed by a third tangent line tangent to the virtual curve at the third point and the third straight line may include a third obtuse angle, and the third obtuse angle may be larger than the second obtuse angle. The virtual curve may pass through a center of the first light source, a center of the second light source, and a center of the third light source. The curvatures of the virtual circles formed by the plurality of convex portions may be the same as each other. A diameter of the circle formed by the convex portion may be larger than a thickness of the resin layer. Each of the plurality of light sources is disposed within a virtual circle formed by the convex portion facing the light source. The plurality of convex portions may have a hemispherical, elliptical or aspherical shape. A second reflective layer may be disposed between the resin layer and the substrate. The thickness of the resin layer may be smaller than the distance from the rear surface to the light exit surface. The maximum distances from the centers of the respective light-emitting elements to the respective convex portions may be the same. Each of the plurality of light-emitting elements may be disposed on the circumference of the virtual circle, and a plurality of straight lines passing through the centers of the respective light-emitting elements and the centers of the respective virtual circles may be parallel to each other. The plurality of light-emitting elements may include first to third light-emitting elements, the plurality of convex portions may include first to third convex portions, the plurality of straight lines may include first to third straight lines, the plurality of tangent lines may include first to third tangent lines, the first angle formed by the first straight line and the first tangent line may be a first obtuse angle, the first angle formed by the second straight line and the second tangent line may be a second obtuse angle, and the first angle formed by the third straight line and the third tangent line may be a third obtuse angle, and the second obtuse angle may be greater than the first obtuse angle and smaller than the third obtuse angle. The straight line connecting adjacent light-emitting elements may have an inclination with respect to a horizontal line. Effect of the Invention

[0008] According to an embodiment of the present invention, a resin layer and a light source are disposed between a plurality of reflective layers to provide a line-shaped surface light source. According to an embodiment of the present invention, a lighting module is provided in a line shape having a thin thickness and a long length in one direction, improving luminosity and increasing design freedom. According to an embodiment of the present invention, a manufacturing process of a lighting module can be simplified by forming a resin layer covering a light source between a plurality of reflective layers. According to an embodiment of the present invention, light loss can be reduced and light efficiency can be improved. According to an embodiment of the present invention, uniformity of light of a surface light source emitted between a plurality of reflective layers can be improved. According to an embodiment of the present invention, the center of each of a plurality of light sources and the center of a virtual circle forming a convex portion of the resin layer are aligned, thereby improving uniformity of light along a light emission direction. According to an embodiment of the present invention, the light source disposed along a virtual curved or oblique direction and the convex portion of the resin layer are aligned to correspond to each other, thereby improving uniformity of light. The lighting module according to an embodiment of the present invention and a lighting device having the same have improved optical reliability. The lighting module according to an embodiment of the present invention can be applied to a vehicle lighting device, a light unit, various display devices, and a surface light source lighting device having the lighting module according to an embodiment of the present invention. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view showing a lighting device according to a first embodiment of the invention. [Diagram 2] FIG. 2 is a cross-sectional view of the illumination device of FIG. 1 taken along the line BB. [Diagram 3] 3 is a cross-sectional view of the illumination device of FIG. 1 taken along line CC. [Figure 4] FIG. 4 is an example of a plan view of the lighting device of FIG. [Diagram 5] FIG. 5 is an example of a plan view of a lighting device according to a second embodiment of the invention. [Figure 6] FIG. 6 is an enlarged view of the first region A1 of the lighting device of FIG. [Figure 7] FIG. 7 is a partial enlarged view of the second region A2 of the lighting device of FIG. [Figure 8]FIG. 8 is an enlarged view of the third area A3 of the lighting device of FIG. [Figure 9] FIG. 9 is a diagram illustrating an example in which a light source and a convex portion of a resin layer are aligned in a target direction in a lighting device according to an embodiment of the invention. [Figure 10] 10A and 10B are diagrams illustrating the light emission angle at a convex portion according to the position of a light source having a first size in an embodiment of the invention. [Figure 11] 11A and 11B are diagrams illustrating the light output angle at the convex portion according to the position of the light source having a second size in an embodiment of the invention. [Figure 12] 12A and 12B show examples of the embodiment of the invention in which the position of the light source on the elliptical convex portion that is long in the second direction X is changed. [Figure 13] 13A and 13B show examples of the embodiment of the invention in which the position of the light source on the elliptical convex portion that is long in the first direction Y is changed. [Figure 14] FIGS. 14A and 14B show examples of the embodiment of the present invention in which the position of the light source on the convex portion having an aspheric lens shape is changed. [Figure 15] FIGS. 15(A) to 15(E) are diagrams illustrating the path of light according to the difference in distance between the position of the light source and the center of the convex portion in an embodiment of the invention. [Figure 16] FIG. 16 is a diagram for explaining the emission angle of light according to the positions of the convex parts of the resin layer and the light source in an embodiment of the invention. [Figure 17] FIG. 17 is an example of a flexible lighting device in accordance with an embodiment of the invention. [Figure 18] FIG. 18 is an example of a flexible lighting device in accordance with an embodiment of the invention. [Figure 19] FIG. 19 shows an example of a lamp to which the lighting device according to the embodiment of the invention is applied. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will enable a person skilled in the art to which the present invention pertains to easily carry out the present invention. However, it should be understood that the embodiment described in this specification and the configurations illustrated in the drawings are merely preferred embodiments of the present invention, and that various equivalents and modifications may exist at the time of filing this application. In describing the operation principle of the preferred embodiment of the present invention in detail, if a detailed description of a related known function or configuration is deemed to unnecessarily obscure the gist of the present invention, the detailed description will be omitted. The terms described below are defined in consideration of the functions in the present invention, and the meaning of each term should be interpreted based on the overall content of this specification. The same reference numerals are used for parts having similar functions and functions throughout the drawings. 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 of the present invention can be applied to headlamps, width lamps, side mirror lamps, fog lamps, tail lamps, brake lights, auxiliary brake lights, turn signals, position lamps, daytime running lights, vehicle interior lighting, door scuffs, rear combination lamps, backup lamps, room lamps, dashboard lighting, etc. The lighting device of the present invention can also be applied to indoor and outdoor advertising devices, display devices, and various electric vehicles, and can be applied to all lighting fields and advertising fields that are currently developed and commercialized or that can be realized through future technological development.

[0011] The following embodiments will become clearer with reference to the accompanying drawings and the description of the embodiments. In the description of the embodiments, when it is described that each layer, region, pattern, or structure is formed "on" or "under" a substrate, each layer, region, pad, or pattern, "on" and "under" include those formed "directly" or "indirectly through another layer." In addition, the reference to the top or bottom of each layer is described with reference to the drawings.

[0012] <Lighting equipment> FIG. 1 is a perspective view showing an illumination device according to a first embodiment of the invention, FIG. 2 is a cross-sectional view of the illumination device of FIG. 1 taken along the line BB, FIG. 3 is a cross-sectional view of the illumination device of FIG. 1 taken along the line CC, and FIG. 4 is an example of a plan view of the illumination device of FIG. 1.

[0013] 1 to 4, the lighting device 200 according to the embodiment of the invention includes a plurality of light sources 100, and irradiates light emitted from the plurality of light sources 100 as a light source having a line width. The light emitted from the light source 100 is emitted as a surface light source having a line width or a thin height. The lighting device 200 may be a flexible module or a rigid module. The lighting device 200 may be flat or bendable in at least one of a first direction Y and a second direction X. The lighting device 200 may include both sides corresponding to each other in a first direction Y and both sides corresponding to each other in a second direction X. The line width of the lighting device 200 is a vertical height and may be 3 mm or less, for example, 3 mm or less, or may range from 2.4 mm to 3 mm. The lighting device 200 is provided as a module such as a straight line, a curve, or a wave shape, improving the design freedom of the lighting and effectively installing it at the position of the lamp in the bracket or housing. The lighting device 200 may include a substrate 210, a light source 100 disposed on the substrate 210, a resin layer 220 disposed on the substrate 210 and the light source 100, and a first reflective layer 240 disposed on the resin layer 220. The lighting device 200 may include a second reflective layer 230 between the substrate 210 and the resin layer 220. A plurality of the light sources 100 are arranged in the second direction X or in a direction from the third surface S3 to the fourth surface S4. The light sources 100 are arranged in one row. As another example, the light sources 100 may be arranged in two or more rows in different columns. The plurality of light sources 100 are arranged on a straight line or a curved line extending in the second direction X. Each of the light sources 100 may be a light emitting element. Here, as shown in FIG. 4, the intervals G1 between adjacent light sources 100 may be the same. The intervals G1 may be the same for uniform distribution of light emitted from the light sources 100. The interval G1 may be larger than the thickness of the lighting device 200, for example, the vertical distance (for example, Z1) from the lower surface of the substrate 210 to the upper surface of the first reflective layer 240. For example, when the vertical distance is Z1, the interval G1 may be three times or more the thickness Z1. The interval G1 may be 10 mm or more, for example, in the range of 10 mm to 20 mm.If the interval G1 is greater than the range, the luminous intensity may decrease, and if it is less than the range, the number of light sources 100 increases. As another example, as shown in FIG. 5, adjacent light sources 100 are not arranged on the same straight line, and in this case, a line connecting two adjacent light sources 100 is provided as a virtual curve or a curve having an inflection point. The lighting device 200 may have a maximum length X1 in the second direction X greater than a maximum length Y1 in the first direction Y. The lengths of the first and second directions Y, X may be greater than a thickness Z1 or height in the vertical direction Z. The maximum length X1 in the second direction X may vary depending on the number of the light sources 100 arranged, and may be, for example, 30 mm or more. The maximum length Y1 in the first direction Y may be 13 mm or more, for example, in a range of 13 mm to 25 mm. The maximum length Y1 in the first direction Y of the lighting device 200 is provided in consideration of an area where the light emitted from the light source 100 is diffused, an area protecting the rear of the light source 100, and a pattern area. With respect to the maximum length Y1 in the first direction Y, the length of the third surface (e.g., S3) and the length of the fourth surface (e.g., S4) of the lighting device may be the same or different. For example, the length of the fourth surface S4 in the first direction Y may be smaller than the length of the third surface S3. The light source 100 is disposed between layers of reflective material facing each other in a vertical direction. The light source 100 may be disposed adjacent to one of the layers in a region between the layers of reflective material facing each other in a vertical direction. The light source 100 may be disposed between a supporting member and a reflective member or layer facing each other in a vertical direction. The light source 100 may emit light in at least one direction or in a plurality of directions. In the lighting device 200, each side may have the same thickness or the same height. The light source 100 is sealed by a layer of transparent resin material, and the layer of resin material may be disposed between layers of reflective material or between a supporting member and a reflective layer or member.

[0014] The substrate 210 includes a printed circuit board (PCB), and may include, for example, a resin-based PCB, a metal core PCB, a flexible PCB, a ceramic PCB, or an FR-4 substrate. The substrate 210 may be made of a flexible or rigid material. The substrate 210 has a circuit pattern disposed on an upper portion thereof, and the circuit pattern may include a plurality of pads in an area corresponding to the light source 100. The circuit pattern of the substrate 210 may be disposed on an upper portion or on an upper and lower portion thereof.

[0015] The resin layer 220 is disposed on the light source 100. The resin layer 220 is disposed on each side of the light source 100, between adjacent light sources 100, or on the top of each light source 100. The resin layer 220 is disposed on the substrate 210. The resin layer 220 is disposed between the substrate 210 and a first reflective layer 240. The resin layer 220 is disposed between an upper surface of the substrate 210 and a lower surface of the first reflective layer 240. The resin layer 220 may surround the light sources 100 disposed on the substrate 210 or may bury the light sources 100. The resin layer 220 may be a light-transmitting layer. The resin layer 220 may include a glass material as another material. The light sources 100 are disposed in a first row or along a virtual line in a number of n (n≧2). The thickness of the resin layer 220 is smaller than the thickness of the lighting device 200, so that the width of the line light may be smaller. That is, the width of the line light source may be the thickness of the resin layer 220. The resin layer 220 may include a first surface S1 and a second surface S2 arranged on opposite sides to each other, and a third surface S3 and a fourth surface S4 arranged on opposite sides to each other. As shown in FIG. 4, the first and second surfaces S1 and S2 may be arranged to correspond to each other in a first direction Y, and the third and fourth surfaces S3 and S4 may correspond to each other in a second direction X. The first and second surfaces S1 and S2 may be arranged to correspond to each other based on a virtual line connecting the plurality of light sources 100. The third and fourth surfaces S3 and S4 are arranged outside the outermost light source of the plurality of light sources 100. As another example, as shown in FIG. 5, the first and second surfaces S1 and S2 are extended along a virtual line and arranged on opposite sides to each other based on the plurality of light sources 100.

[0016] Each outer surface of the lighting device 200 may be a side surface of the resin layer 220 having the largest thickness in the lighting device 200. The outer surfaces S1, S2, S3, and S4 of the resin layer 220 are disposed in a vertical direction or in the same plane as the sides of the substrate 210, the second reflective layer 230, and the first reflective layer 240. As another example, at least one of the outer surfaces S1, S2, S3, and S4 of the resin layer 220 is disposed in the same plane as the sides of the substrate 210, the second reflective layer 230, and the first reflective layer 240, or is provided as an inclined surface. The first and second surfaces S1 and S2 extend in the second direction X from both ends of the third and fourth surfaces S3 and S4. The first surface S1 may include a curved surface facing the second surface S1. The first surface S1 may be a surface in a direction in which light is emitted from the plurality of light sources 100, and the second surface S2 may be a surface in a direction opposite to the direction in which light is emitted from the plurality of light sources 200. The third surface S3 may be an outer surface adjacent to the first light source, and the fourth surface S4 may be an outer surface adjacent to the last light source. The plurality of light sources 100 are disposed between the first surface S1 and the second surface S2. The plurality of light sources 100 are disposed between the third surface S3 and the fourth surface S4. In the resin layer 220, the length of the first surface S1 and the second surface S2 in the second direction X may be greater than the height or thickness in the vertical direction. The maximum lengths of the first surface S1 and the second surface S2 in the second direction X may be the same or different from each other. The height or thickness in the vertical direction of the first surface S1 and the second surface S2 may be the same as each other. The vertical height or thickness of the third surface S3 and the fourth surface S4 may be the same as the vertical height or thickness of the first surface S1 and the second surface S2. In the resin layer 220, the first surface S1 and the second surface S2 may be side surfaces having a long length in the second direction X. The third surface S3 and the fourth surface S4 may be side surfaces having a long length in the first direction Y. The first surface S1 may correspond to the emission part 111 of the light source 100, or may be a surface exposed in the second direction X from a first end of the third surface S3 and the fourth surface S4. The second surface S2 may face the rear surface of the plurality of light sources 100, or may be a surface exposed in the second direction X from a second end of the third surface S3 and the fourth surface S4. The third surface and the fourth surface S3, S4 may be side surfaces different from the first surface S1 and the second surface S2.The rear surface of the light source 100 may be the surface opposite to the light emitting portion 111 or may correspond to the second surface S2.

[0017] The emission part 111 of each of the light sources 100 may correspond to the first surface S1. Light emitted from the light source 100 is emitted through the first surface S1, and a part of the light is emitted through at least one of the second surface S2, the third surface S3, and the fourth surface S4. That is, most of the light emitted from the light source 100 is emitted through the first surface S1. In the lighting device 200, the maximum lengths Y1 and X1 in the first and second directions may be the maximum lengths of the resin layer 220 in the first and second directions Y and X. Thus, a line-shaped light source is emitted through the first surface S1 of the resin layer 220. The thickness of the first surface S1 of the resin layer 220 may be less than 3 mm as the thickness of the resin layer 220. In the resin layer 220, the first surface S1 may be an emission surface from which the light emitted from the light source 100 is emitted. The first surface S1 may be a front surface or an emission surface, and the second surface S2 may be a rear surface or a non-emission surface. The first surface S1 extends in the vertical direction with a structure having a convex portion P0 and a recess portion C0 along the second direction X. As another example, the first surface S1 may be a curved surface that bulges in the vertical direction, an inclined structure that protrudes from the upper end to the lower end, or an inclined structure that protrudes from the lower end to the upper end. The first surface S1 may be a side surface on which a regular uneven shape or an uneven structure is arranged. The first surface S1 may be an area having a larger surface area than the surface area of ​​the opposite second surface S2. The first surface S1 may include a plurality of convex surfaces S11 corresponding to each light source 100 and a plurality of concave surfaces S12 respectively disposed between the plurality of convex surfaces S11. The resin layer 220 may include a plurality of convex portions P0 protruding with a convex surface S11 from the first surface S1. The convex portions P0 may include a convex surface S11 or a lens surface that bulges in the first surface S1 direction or the emission direction. The convex surface S11 may be provided as a convex lens portion. The resin layer 220 has a concave surface S12 disposed in an area between the protrusions P0 on the first surface S1. The concave surface S12 may be a concave surface or a flat surface. The resin layer 220 or the lighting device 200 may include a recessed portion C0 recessed toward the second surface S2 in an area between the protrusions P0. The recessed portion C0 may overlap the area of ​​the concave surface S12 in the second direction X.The recessed portions C0 are disposed between the protruding portions P0. The recessed portions C0 may be separated from the third and fourth surfaces S3 and S4. The recessed portions C0 may include a concave surface S12 disposed in a region between the protruding portions P0. Here, the first surface S1 may be defined as an emission surface since it can emit light from the entire region. The convex surfaces S11 and the concave surfaces S12 are alternately disposed. The convex portions P0 and the recessed portions C0 are alternately disposed. The surface disposed at the outermost edge of the first surface S1 in the second direction X may be a part of the convex surface S11. The outermost convex surface S11 extends from the third surface S3 or extends from the fourth surface S4. The centers of the plurality of convex surfaces S11 are disposed at positions corresponding to the centers of the plurality of light sources 100 in the first direction Y. The centers of the plurality of convex portions P0 are disposed at positions corresponding to the centers of the plurality of light sources 100 in the first direction Y. Each of the light sources 100 may overlap each of the convex portions P0 in the first direction Y. Each of the light sources 100 may overlap the convex surface S11 in the first direction Y, but may not overlap the concave surface S12 in the first direction Y. Each of the light sources 100 may not overlap the recessed portion C0 in the first direction Y. The vertical height of the convex surface S11 may be the same as the vertical thickness of the resin layer 220. The vertical height of the concave surface S12 may be the same as the vertical thickness of the resin layer 220. The resin layer 220 may cover or mold the light source 100. Each of the light sources 100 may include a light emitting chip. The light source 100 may include a reflective sidewall, for example a body, surrounding the outside of the light emitting chip. The reflective sidewall is provided in a structure in which an area facing the first surface S1 of the resin layer 220 is open and surrounds the light emitting chip. The reflective sidewall may be a part of the light source 100 or may be provided by a separate reflective material. The side surface of the light source 100 except for the light emitting part 111 may be made of a reflective material or a transparent or opaque material. The resin layer 220 may have a refractive index of 1.70 or less, for example, in the range of 1.25 to 1.70. If the refractive index of the resin layer 220 is out of this range, the light extraction efficiency may be reduced.

[0018] Each of the light sources 100 has a bonding part disposed at a bottom thereof and is electrically connected to a pad of the substrate 210. The light sources 100 may be connected in series, in series-parallel, parallel-series, or in parallel according to the circuit pattern of the substrate 210. As another example, the light sources 100 may be arranged in various connection groups according to the circuit pattern of the substrate 210. The light source 100 may include a package in which an element having a light emitting chip or an LED chip is packaged. The light emitting chip may emit at least one of blue, red, green, and ultraviolet (UV). The light source 100 may emit at least one of white, blue, red, and green. The light source 100 emits light in a lateral direction and has a bottom disposed on the substrate 210. The light source 100 may be a side view type package. As another example, the light source 100 may be an LED chip, and one side of the LED chip may be open and a reflective member may be disposed on the other side. The light source 100 may include a phosphor. The light source 100 may include a phosphor layer or a molding member covering a surface of the light emitting chip. The phosphor layer may be a layer to which phosphor is added, and the molding member may be a transparent resin member having phosphor or a transparent resin member without impurities such as phosphor.

[0019] As shown in FIG. 4, the maximum distance D2 between the light source 100 and the first surface S1 and the distance D3 between the light source 100 and the second surface S2 may be different based on the light source 100. The distance D3 between the light source 100 and the second surface S2 may be 2 mm or more, for example, in the range of 2 mm to 20 mm. If the distance D3 between the light source 100 and the second surface S2 is smaller than the range, the area where moisture can penetrate or a circuit pattern can be formed becomes smaller, and if it is larger than the range, the size of the lighting device 200 becomes larger. The maximum distance D2 may be the maximum interval between the convex surface S11 and the light source 100, or the linear distance between the light source 100 and the apex of the convex portion P0. The maximum distance D2 may be 5 mm or more, for example, in the range of 5 mm to 20 mm or in the range of 8 mm to 20 mm. If the maximum distance D2 is smaller than the range, a hot spot may occur, and if it is larger than the range, the module size becomes larger. When the light sources 100 are arranged on the same straight line, the distance D1 between the straight line connecting the adjacent concave surfaces S12 and each of the light sources 100 may be 5 mm or more, for example, in the range of 5 mm to 12 mm. When the distance D1 is smaller than the range, the depth D4 of the recessed portion C0 may be deep or the maximum distance D2 may be narrow, so that a dark area may occur in the recessed portion C0. The distance D1 can be varied according to the light directivity angle of each of the light sources 100. That is, when the distance between the straight line connecting both ends of the convex portion P0 and each of the light sources 100 is too close, the light is focused on the center region of the convex surface S11, and when the distance is too far, the light is irradiated to the concave surface S12, and the luminous intensity through the convex surface S11 is reduced. The interval W1 between the recessed portion C0 or the concave surface S12 in the first direction Y is the straight line distance between the adjacent recessed portions C0, and may be equal to or smaller than the interval G1 of the light sources 100. If the interval W1 is greater than the interval G1 between the light sources 100, two or more light sources 100 are disposed in the region of the convex portion P0, increasing the luminous intensity, but making it difficult to control the light distribution. If the interval W1 is smaller than the interval G1 between the light sources 100, the size of the convex portion P0 is small, providing a uniform distribution of light, but decreasing the luminous intensity.

[0020] The interval W1 between the recessed portions C0 may be 15 mm or more, for example, in the range of 15 mm to 20 mm. The interval W1 between the recessed portions CO may be greater than the depth D4 of the recessed portions C0. The ratio of the interval W1 between the recessed portions C0 and the depth D4 of the recessed portions CO may be in the range of 1:0.4 to 1:0.7. If the depth of the recessed portions C0 is smaller than the range, a dark area between the adjacent convex portions P0 increases. If the depth of the recessed portions C0 is greater than the range, the light proceeds to an area adjacent to the light source 100, and the interference of light between the light sources 100 increases. The depth D4 of the recessed portions C0 may be a straight line distance between the bottom point of the recessed portions C0 and a straight line connecting the apexes of the convex portions P0. The second reflective layer 230 is disposed between the resin layer 220 and the substrate 210. The resin layer 220 may contact the upper surface and side surface of each of the light sources 100. The resin layer 220 may contact an upper surface of the second reflective layer 230. A part of the resin layer 220 may contact the substrate 210 through a hole in the second reflective layer 230. The resin layer 220 may contact the emission part 111 of each of the light sources 100. The first surface S1, the second surface S2, the third surface S3, and the fourth surface S4 of the resin layer 220 are outer surfaces between the first and second reflective layers 240 and 230. The upper surface of the resin layer 220 may contact the first reflective layer 240, and the lower surface of the resin layer 220 may contact the second reflective layer 230. The upper and lower surfaces of the resin layer 220 may be horizontal planes or surfaces having a curvature. When the second reflective layer 230 is not present, the lower surface of the resin layer 220 may contact the substrate 210. The lower surface area of ​​the resin layer 220 may be the same as the upper surface area of ​​the substrate 210. A bottom surface area of ​​the resin layer 220 may be the same as a top surface area of ​​the second reflective layer 230. A top surface area of ​​the resin layer 220 may be the same as a top surface area of ​​the first reflective layer 240. A length of the resin layer 220 in the second direction X may be the same as a length (e.g., X1) of the substrate 210. A maximum length of the resin layer 220 in the second direction X may be the same as a maximum length of the second reflective layer 230 or the first reflective layer 240. A maximum length of the resin layer 220 in the first direction Y (e.g., Y1) may be the same as a maximum length of the substrate 210.The maximum length (e.g., Y1) of the resin layer 220 in the first direction Y may be the same as the maximum length of the second reflective layer 230. The maximum length (e.g., Y1) of the resin layer 220 in the first direction Y may be the same as the maximum length of the first reflective layer 240. The minimum length of the resin layer 220 in the first direction Y may be the same as the minimum length of the substrate 210. The minimum length of the resin layer 220 in the first direction Y may be the same as the minimum length of the second reflective layer 230 or the first reflective layer 240. The maximum length Y1 in the first direction Y may be the maximum distance between the apex (or high point) of the convex portion P0 of the lighting device and the second surface S2, and the minimum length may be the minimum distance between the bottom point of the concave surface S12 of the lighting device and the second surface S2.

[0021] A resin layer 220 is disposed in an area between the first and second reflective layers 240 and 230. The first and second reflective layers 240 and 230 may have the same area and face the upper and lower surfaces of the resin layer 220. Thus, the resin layer 220 may diffuse the light emitted from the light source 100 and the light reflected by the first and second reflective layers 240 and 230, and guide the light toward the first surface S1 to emit the light. The second reflective layer 230 may reflect the light emitted from the light source 100. The second reflective layer 230 may be formed as an upper layer of the substrate 210 or may be formed as a separate layer. The second reflective layer 230 is attached to the upper surface of the substrate 210 with an adhesive. The resin layer 220 is attached to the upper surface of the second reflective layer 230. The second reflective layer 230 has a plurality of holes 232 in an area corresponding to the lower surface of the light source 100, and the light source 100 is connected to the substrate 210 through the holes 232. A portion of the resin layer 220 may contact the substrate 210 through the holes 232. The holes 232 may be an area where the light source 100 is bonded to the substrate 210. The second reflective layer 230 may be formed in a single layer or multi-layer structure. The second reflective layer 230 may include a material that reflects light, for example, a metal or a non-metal material. If the second reflective layer 230 is a metal, it may include a metal layer such as stainless steel, aluminum (Al), or silver (Ag), and if the second reflective layer 230 is a non-metal material, it may include a white resin material or a plastic material. The second reflective layer 230 may include a white resin material or a polyester (PET) material. The second reflective layer 230 may include at least one of a low reflection film, a high reflection film, a diffuse reflection film, or a regular reflection film. The second reflective layer 230 may be provided, for example, as a specular reflective film for reflecting incident light to the first surface S1.

[0022] As shown in FIG. 2, the thickness Zc of the second reflective layer 230 may be smaller than the thickness Za of the substrate 210. The thickness Zc of the second reflective layer 230 is disposed to be 0.5 times or more and less than 1 time the thickness Za of the substrate 210, so that the transmission loss of the incident light can be reduced. The thickness Zc of the second reflective layer 230 may be in the range of 0.2 mm to 0.4 mm, and if it is smaller than this range, the light transmission loss occurs, and if it is thicker than this range, the thickness Z1 of the lighting device 200 increases. The first reflective layer 240 is disposed on the entire upper surface area of ​​the resin layer 220, so that the loss of light can be reduced. The resin layer 220 may be formed to have a thickness Zb that is thicker than the thickness of the light source 100. Here, the thickness of the light source 100 may be smaller than the length K1 (FIG. 4) in the second direction X as the vertical length of the light source 100. The thickness of the light source 100 may be 3 mm or less, for example, 2 mm or less. The thickness of the light source 100 may range from 1 mm to 2 mm, for example, from 1.2 mm to 1.8 mm. A part of the resin layer 220 is disposed between each of the light sources 100 and the first reflective layer 240. Thus, the resin layer 220 can protect the upper part of each of the light sources 100 and prevent moisture from penetrating. Since the light source 100 has the substrate 210 disposed at the lower part and the resin layer 220 disposed at the upper part, the upper and lower parts of each of the light sources 100 can be protected. Therefore, the interval between the upper surface of the resin layer 220 and the upper surface of each of the light sources 100 may be 0.6 mm or less, for example, in the range of 0.5 mm to 0.6 mm. The upper part of the resin layer 220 extends to the upper part of each of the light sources 100, and can protect the upper part of the light source 100. The thickness Zb of the resin layer 220 may be the interval between the upper surface and the lower surface of the resin layer 220. The thickness Zb of the resin layer 220 may be the vertical distance between the first and second reflective layers 240, 230. The thickness Zb may be the same as the distance between the first and second reflective layers 240, 230. The thickness Zb may be smaller than the distance between the first surface S1 and the second surface S2. For example, the distance between the first surface S1 and the second surface S2 may include a maximum length Y1 and a minimum length. The maximum length Y1 in the first direction Y may be the linear distance between the apex of the convex portion P0 and the second surface S2.The distance or interval between the third and fourth surfaces S3, S4 of the resin layer 220 may be greater than the distance between the apex of the convex portion P0 and the second surface S2. The minimum length in the first direction Y may be a linear distance between the concave surface S12 and the second surface S2. The distance or interval between the second reflective layer 230 and the first reflective layer 240 may be less than the distance or interval between the first surface S1 and the second surface S2 of the resin layer 220. By disposing the distance between the first and second reflective layers 240, 230 to be smaller than the length or minimum width in the first direction Y of the lighting device 200, a line-shaped surface light source can be provided through the first direction Y, improving luminous intensity and preventing hot spots. In addition, the lighting device may be provided with a certain thickness and flexible characteristics that can be uneven in the third direction Z. The thickness Zb of the resin layer 220 may be less than twice the thickness of the light source 100, for example, more than 1 to 2 times the thickness of the light source 100. The thickness Zb of the resin layer 220 may be 2 mm or less, for example, in the range of 1.5 mm to 1.9 mm or 1.6 mm to 1.8 mm. The thickness Zb of the resin layer 220 may be 0.8 times or less the thickness Z1 of the lighting device 200, for example, in the range of 0.4 to 0.8 times the thickness Z1 of the lighting device 200. Since the resin layer 220 is disposed with a difference of 1.2 mm or less from the thickness Z1 of the lighting device 200, it is possible to prevent a decrease in light efficiency in the lighting device 200 and to enhance flexibility characteristics. As shown in FIG. 4, the length K1 of each of the light sources 100 in the second direction X may be 2 mm or more, for example, in the range of 2 mm to 7 mm. The length K1 of each of the light sources 100 is the length of a long side, which is a length smaller than the width of each of the convex portions 100, and may be larger than the thickness of the light source. The thickness Zb of the resin layer 220 may be smaller than the length or maximum length of each of the light sources 100 in the second direction X. The thickness Zb of the resin layer 220 may be smaller than the maximum length of the convex surface S11 in the second direction X. That is, by providing a slim thickness Zb of the resin layer 220, a surface light source having a line shape, for example, a line width of 3 mm or less, can be provided through the first surface S1 in one direction. The convex surface of the convex portion P0 or the convex surface S11 may have a first curvature. The concave surface S12 may be flat or have a curvature larger than the first curvature.Here, the radius of curvature of the convex portion P0 may be 5 mm or more, for example, in the range of 5 mm to 15 mm or in the range of 8 mm to 11 mm. If the radius of curvature of each of the convex portions P0 is smaller than the range, the improvement in luminous intensity is insignificant, and if it is larger than the range, dark areas may occur. At least one or more radii of curvature of the concave surface S12 may be smaller than the radius of curvature of the convex portion P0 by 0.12 times or less. The ratio of the radius of curvature of the concave surface S12 to the radius of curvature of the convex portion P0 may be in the range of 1:8 to 1:28. If the radius of curvature of the concave surface S12 is smaller than the range, the amount of light emitted through the concave surface S12 decreases and dark areas increase, and if it is larger than the range, the size of the convex portion P0 becomes smaller, and light interference between the light sources 100 may occur. Therefore, the depth D4 and the radius of curvature of the concave surface S12 may have a range for improving the uniformity of light through the convex portion P0 and the recessed portion C0 and suppressing dark areas in the recessed portion C0, taking into consideration the position of the light source 100 and the directivity angle of the light source 100. The radius of curvature of the concave surface S12 may be 1.2 mm or less, for example, in the range of 0.5 mm to 1.2 mm. The concave surface S12 is provided in a curved shape with a predetermined curvature, so that the incident light can be refracted and transmitted, and the occurrence of dark areas in the recessed portion C0 region can be reduced.

[0023] Meanwhile, the resin layer 220 may include a resin material such as silicone, silicone molding compound (SMC), epoxy or epoxy molding compound (EMC). The resin layer 220 may include a UV (ultra violet) curable resin or a thermosetting resin material, and may selectively include, for example, PC, OPS, PMMA, PVC, etc. For example, the main material of the resin layer 220 may be a resin material having urethane acrylate oligomer as a main raw material. For example, a mixture of urethane acrylate oligomer, which is a synthetic oligomer, and a polymer type, which is polyacrylic, may be used. Of course, a monomer mixed with IBOA (isobornyl acrylate), HPA (hydroxylpropyl acrylate), 2-HEA (2-hydroxyethyl acrylate), etc., which are low boiling point dilution type reactive monomers, may further be included, and a photoinitiator (e.g., 1-hydroxycyclohexyl acrylate) may be used as an additive. phenyl-ketone, etc.) or an antioxidant may be mixed into the resin layer 220. Beads (not shown) may be included in the resin layer 220, and the beads may increase the amount of light by diffusing and reflecting incident light. The resin layer 220 may include a phosphor. The phosphor may include at least one of a yellow phosphor, a green phosphor, a blue phosphor, and a red phosphor. The region of the resin layer 220 where the convex portion P0 is formed may be provided as a lens portion. The lens portion of the resin layer 220 has a convex surface. The lens may have a lens shape, and may have a hemispherical shape, a semicircular shape, a semi-elliptical shape, or an aspherical shape when viewed from the top. The lens may include a collimator lens. The lens portion is farther away from the light source 100 as the apex of the lens portion corresponds to the center of the light source 100. The thickness of the lens portion in the third direction Z may be the thickness of the resin layer 220. The lens portion has flat upper and lower surfaces and is curved in the first surface S1 direction, so that the light incident in the first surface S1 direction can be diffused.The lens unit is disposed between the first and second reflective layers 240 and 230, which are flat at the top and bottom, and can refract and emit light to the first surface S1. The lens unit can refract light incident on an area off the optical axis with respect to the optical axis to an emission angle larger than an incidence angle. When the lighting device 200 has a bend due to a flexible characteristic, the resin layer 220 and the first and second reflective layers 240 and 230 can include an uneven curved area. Therefore, each of the convex surfaces S11 of the resin layer 220 can emit light emitted from each of the light sources 100. The recessed portion C0 disposed between the convex portions P0 in the resin layer 220 is provided as a recess recessed toward the second surface S2. The recessed portion C0 of the resin layer 220 is formed on the concave surface S12 of the resin layer 220. Since light emitted from each light source 100 is output from the area between the protruding portions P0 through the recessed portions C0, the occurrence of dark areas in the recessed portions C0 can be reduced. Here, when the protruding portions P0 and the recessed portions C0 are disposed in the resin layer 220, the substrate 210 and the first and second reflective layers 240 and 230 are provided with a shape in one side direction corresponding to the protruding portions P0 and the recessed portions C0. The number of the protruding portions P0 or the lens portions of the resin layer 220 may be the same as the number of the light sources 100.

[0024] The first reflective layer 240 may be made of the same material as the second reflective layer 230. The first reflective layer 240 may be made of a material having a higher light reflectivity than the material of the second reflective layer 230 or may have a greater thickness in order to reflect light and reduce light transmission loss. The first reflective layer 240 may have a thickness equal to or greater than the thickness Zc of the second reflective layer 230. For example, the first and second reflective layers 240 and 230 may be provided with the same material and the same thickness. The thickness Zd of the first reflective layer 240 may be equal to or smaller than the thickness Za of the substrate 210. The thickness Zd of the first reflective layer 240 is disposed to be 0.5 times or more, for example, in the range of 0.5 times to 1 times, the thickness Za of the substrate 210, so that the transmission loss of the incident light can be reduced. The thickness Zd of the first reflective layer 240 may be in the range of 0.2 mm to 0.4 mm. If the thickness Zd is smaller than the range, a light transmission loss occurs, and if the thickness Zd is larger than the range, the thickness Z1 of the lighting device 200 increases. The first reflective layer 240 may be formed in a single layer or a multi-layer structure. The first reflective layer 240 may include a material that reflects light, for example, a metal or a non-metal material. If the first reflective layer 240 is a metal, it may include a metal layer such as stainless steel, aluminum (Al), or silver (Ag), and if the first reflective layer 240 is a non-metal material, it may include a white resin material or a plastic material. The first reflective layer 240 may include a white resin material or a polyester (PET) material. The first reflective layer 240 may include at least one of a low reflection film, a high reflection film, a diffuse reflection film, or a regular reflection film. The first reflective layer 240 may be provided as a regular reflection film so that the incident light travels in the direction of the first surface S1. The first and second reflective layers 240 and 230 may be made of the same or different materials. The substrate 210 and the first and second reflective layers 240, 230 may include a convex portion P0 and a recessed portion C0 of the resin layer 220. That is, the convex portions P0 of the substrate 210 and the first and second reflective layers 240, 230 are disposed on the upper and lower surfaces of the convex portion P0 of the resin layer 220, and the recessed portions C0 of the substrate 210 and the first and second reflective layers 240, 230 are disposed on the recessed portion C0.Therefore, the laminated structure of the substrate 210, the second reflective layer 230, the resin layer 220, and the first reflective layer 240 may include the same structure as the convex portion P0 and the recessed portion C0 in one direction. The convex portion P0 may have a flat upper and lower surface and a curved surface or a hemispherical shape in the first direction Y. The recessed portion C0 may include a flat or concave curved surface in the second surface S2 direction. At least one or both of the convex surface S11 and the concave surface S12 in the resin layer 220 may be treated to have a haze surface or a prism shape to diffuse light. The haze surface may be treated to have a rougher surface than the inner surface of the resin layer 220 to diffuse the emitted light. Here, as shown in FIG. 4, the light source 100 may be located in the area of ​​a virtual circle Vc formed by each of the convex portions P0. That is, the maximum distance D2 between the convex portion P0 and the light source 100 may be smaller than the diameter r0 of the virtual circle Vc. At this time, the light is emitted with a directivity angle distribution through each convex portion P0 arranged on the virtual circle that satisfies the maximum distance D2 from the light source 100, so that more light can be concentrated on the target area or in the light traveling direction. The lighting device 200 according to the embodiment of the invention provides a thickness Z1 in the third direction Z in a line shape, so that the design freedom of the line light source and stable lighting can be provided. Also, the uniformity of the entire line light source can be improved. The thickness Z1 of the lighting device 200 may be 3 mm or less, for example, 3 mm or less, or may range from 2.4 mm to 3 mm. Also, the thickness of the resin layer 220 is provided to be less than 3 mm, for example, in the range of 1.5 mm to 1.9 mm, so that the width of the line-shaped surface light source can be narrower. As another example, the lighting device 200 may be disposed in a range of 2 mm to 6 mm, in which case the thickness of the resin layer 220 may be increased to increase the line width and light distribution area. The lighting device 200 having the line light source is applied to a vehicle lamp, and may be selectively applied to, for example, a width light, a side mirror light, a fog lamp, a tail lamp, a brake light, an auxiliary brake light, a turn signal light, a position lamp, a daytime running light, a vehicle interior light, a door scuff, a rear combination lamp (RCL), a backup lamp, a room lamp, and a dashboard light.The rear combination lamp may include a brake light, a tail light, a turn signal light, and a backup lamp. Among the above lamps, a curved lamp may be provided according to a car line.

[0025] In the lighting device disclosed in the first embodiment, a plurality of light sources 100 are arranged on the same straight line, and a line-shaped surface light source emitted through each of the convex parts P0 is irradiated forward. In this case, when a virtual straight line connecting each of the convex parts P0 faces the target area, light is effectively irradiated to the target area. In this case, the target area may have a linear structure arranged at equal intervals from each of the convex parts P0. For example, the target area may include a lens, for example, an inner lens or an outer lens. The number of light sources 100 in the first embodiment may be the same as the number of the convex parts P0, and may be two or more, for example, 2 to 100 or 3 to 40, arranged along the second direction X. That is, two or more light sources 100 are arranged between the third surface S3 and the fourth surface S4. The number of the light sources 100 arranged can be changed according to the installation environment and the target illumination. Meanwhile, when the lamp line of the target area (e.g., car line) where the lighting device is irradiated is provided as a curved line or a bent line, the virtual line connecting a plurality of convex parts or the virtual line connecting a plurality of light sources is provided as a curved structure or an inclined line according to the lamp line of the target area. The second embodiment includes the configuration of the first embodiment, but is an example in which the positions of the light sources and the positions of the convex parts are modified. In the description of the second embodiment, the description of the first embodiment shall be referred to for the same configuration as the first embodiment.

[0026] FIG. 5 is an example of a plan view of a lighting device according to a second embodiment, FIG. 6 is an enlarged view of a first region A1 of the lighting device of FIG. 5, FIG. 7 is an enlarged view of a second region A2 of the lighting device of FIG. 5, and FIG. 8 is an enlarged view of a third region A3 of the lighting device of FIG. 5. The lighting device illustrated in FIG. 4 to FIG. 8 is a plan view seen from above the resin layer 220 or the first reflective layer 240. Referring to FIG. 5 to FIG. 8, the lighting device 200 may include a substrate 210, a light source 100, a first reflective layer 240, and a resin layer 220 as in FIG. 2. A second reflective layer 230 is disposed between the substrate 210 and the resin layer 220. The second reflective layer 230 may reflect light traveling toward the substrate on the substrate 210, and may be removed. The first and second reflective layers 240 and 230 reflect the light emitted through the plurality of light sources 100 in the resin layer 220, and the resin layer 220 guides the light and emits the light through the first surface S1. In the lighting device 200, the plurality of light sources 100 are arranged such that a line connecting the third surface S3 to the fourth surface S4 is arranged along a virtual curve Vc0. The virtual curve Vc0 may pass through the plurality of light sources 100. The virtual curve Vc0 may pass through the center of each light source 100. The virtual curve Vc0 may have a positive curvature or may bulge in the first surface direction with respect to a straight line L9 connecting the centers of a first light source 101 (hereinafter referred to as a first light source) and a last light source 109 (hereinafter referred to as a ninth light source) among the plurality of light sources 100. Alternatively, the virtual line passing through the plurality of light sources 100 may have a curved line that bulges from a straight line connecting the first light source 101 and the ninth light source 109, and may bulge toward the first surface. A part of the virtual line passing through the plurality of light sources 100 is disposed behind the second surface S2. A line that connects the plurality of convex portions P0 from the third surface S3 to the fourth surface S4 along the arrangement direction of the plurality of light sources 100 is disposed along a virtual curved line Vc0. In FIG. 2, the first surface S1 of the resin layer 220 may include a plurality of convex portions P0 and a plurality of recessed portions C0. The first surface S1 having the convex portions P0 and the recessed portions C0 may be an exit surface. That is, the first surface S1 of the resin layer 220 may be an exit surface. In the resin layer 220, the first surface S1 or the exit surface may include a convex surface S11 and a concave surface S12.The convex surface S11 is an outer surface of the convex portion P0, and most of the light is emitted from the convex surface S12. The concave surface S12 is a recessed surface between the convex portions P0, and the light is emitted from the concave surface S12. As shown in FIG. 1 and FIG. 2, the substrate 210, the first reflective layer 240, and the second reflective layer 240 may include a structure of convex portions and recess portions that are the same as the shapes of the convex portions P0 and the recess portions C0 of the resin layer 220. For this configuration, refer to the description of FIG. 1 to FIG. 4. Here, the interior angle Q2 between a straight line L1 passing through two adjacent convex portions based on the first convex portion P1 corresponding to the first light source 101 and a straight line L2 passing through two adjacent convex portions based on the last ninth light source 109 may be an obtuse angle. The angle Q1 between the straight line L1 and a straight line L3 passing through two adjacent convex portions arranged in the center region A2 may be an acute angle that is larger than the angle Q2. Here, the straight line L2 connecting the outermost convex portions may be provided at an angle of 70 degrees or less with respect to the straight line of the second direction X. The interior angle Q2 may have a range of 91 degrees to 150 degrees, and may vary depending on the line of the housing or bracket of the applicable lamp. Here, the plurality of light sources 100 are located on a virtual curve Vc0. The centers of the plurality of light sources 100 are disposed on the virtual curve Vc0. The intervals G1 and G2 between the straight lines perpendicular to two adjacent light sources 100 may be the same. Each straight line perpendicular to each light source 100 extends in a direction perpendicular to the long side of the light source 100. The straight line perpendicular to the light source 100 extends in an optical axis direction or a normal direction with respect to the center of the light source 100. The intervals G1 and G2 are disposed to be the same for uniform distribution of light, but may be disposed at different intervals. For example, the interval G2 between light sources (e.g., 109) relatively far away from the straight line L3 in the center region may be disposed narrower than the interval G1. That is, for the purpose of uniformity of light, the intervals G1, G2 between the light sources may be the same as each other, or may be narrower in a certain region (e.g., A3) based on the center region (e.g., A2) or may be wider in a specific region (e.g., A1). For example, the difference in the interval between two light sources adjacent to the third and fourth faces S3, S4 may be within 10%.If the difference in the distance exceeds 10%, there is a problem in that the difference in the light uniformity between the light sources adjacent to the third and fourth surfaces S3 and S4 becomes large.

[0027] In the lighting device, each of the plurality of light sources 100 is arranged to be inclined or have an inclination with respect to the first or second directions Y, X. That is, the central axis direction of each light source 100 is arranged to be inclined with respect to the first direction Y. Thereby, the intervals G3, G4 between the straight lines extending the long sides of two adjacent light sources may be horizontal intervals, being the smallest in the direction of the third surface S3 and gradually increasing in the direction of the fourth surface S4. That is, the intervals can satisfy G3 < G4. The long side of the light source 100 may be the side surface where the light emitting portion 111 (see FIG. 2) is arranged or the opposite rear surface Sb (see FIG. 6) thereof. That is, in the light source 100, the horizontal interval G3 between two adjacent light sources gradually increases from the first light source 101 in the direction of the fourth surface S4. The vertical intervals Gd between the straight lines of two adjacent light sources 100 can be the same as each other or have an interval difference within 10%. Thereby, when the lighting device is installed along the line of the vehicle lamp, a uniform surface light source distribution can be obtained on each line. Further, the lighting device is provided with a line light source having a thickness of 3 mm or less and is provided with a flexible or non-flexible line light source. The light source 100 is arranged on the virtual curve Vc0. The virtual curve Vc0 is arranged on the straight line connecting the centers of the plurality of light sources 100. The straight line connecting two adjacent light sources among the plurality of light sources 100 can have an inclination with respect to the first or second directions Y, X. In the region close to the edge (for example, A1, A3) in the lighting device 200, the straight line connecting two adjacent light sources among the plurality of light sources 100 can have different inclinations with respect to the first and second directions Y, X as a reference. Here, the inclination of the straight line connecting two light sources adjacent to the fourth surface S4 may be larger than the inclination of the straight line connecting two light sources adjacent to the third surface S3. As another example, at least two of the straight lines connecting the two adjacent light sources 100 can have the same inclination with respect to each other. As another example, at least one or two or more of the straight lines connecting the two adjacent light sources 100 can have different inclinations with respect to each other. Therefore, the inclination of the straight line connecting two adjacent light sources in the lighting device can be made different depending on the regions A1, A2, A3 of the light sources.That is, the inclination of the straight line connecting adjacent light sources 100 in each of the areas A1, A2, and A3 of the lighting device may be different from each other. For example, the first area A1 may be an area in which the first group of light sources adjacent to the third surface S3 are arranged, the second area A2 may be an area in which the second group of light sources on the center side are arranged, and the third area A3 may be an area in which the third group of light sources adjacent to the fourth surface S4 are arranged. The number of light sources in each group may be the same or different from each other. That is, the inclination is larger from the second area A2 to the first area A1, and is larger from the third area A3. In this case, the increase rate of the inclination of the straight line extending from the second area A2 to the first area A1 may be larger than the increase rate of the inclination of the straight line extending to the third area A3.

[0028] For example, when the lighting device is applied to a vehicle lamp, the first region A1 may be the region closest to the front or rear center of the vehicle, and the third region A3 may be the region closest to both front or rear corners of the vehicle. The convex portion P0 may include at least one of a hemispherical shape, a semi-elliptical shape, and a shape having an aspherical surface. The imaginary circle Vc formed by the convex portion P0 may include at least one of a circular shape, an elliptical shape, and a ring shape having an aspherical surface. The radius of curvature or the curvature of the concave surface S12 between the convex portions P0 may be different depending on the region A1, A2, and A3. In each of the regions A1, A2, and A3, the radius of curvature of the concave surface S12 may be larger in one direction or toward the fourth surface S4. The curvature of the concave surface S12 may be smaller in one direction or toward the fourth surface S4. The curvature or the difference between the radius of curvature of the convex portion P0 or the convex surface S11 and the concave surface S12 may be maximum in an area close to the third surface S3 and minimum in an area close to the fourth surface S4. In the lighting device, the maximum length Y1 of the third surface S3 may be greater than the length Y2 of the fourth surface S4. This allows components such as a circuit pattern or a connector to be disposed behind the first and second areas A1 and A2 in the lighting device, so that the length Y4 of the fourth surface S4 can be further reduced. A through hole H1 is disposed in the lighting device 200, and a mounting member such as a screw is attached to the through hole H1. The second surface S2 of the lighting device 200 may be provided with a portion protruding backward on a predetermined curve, for example, a portion to which a connector is connected.

[0029] Referring to FIGS. 6 and 5, in the lighting device 200, the plurality of convex portions P0 may include a first convex portion P1 facing the first light source 101, a second convex portion P2 facing the second light source 102, and a third convex portion P3 facing the third light source 103. The light source 100 may be a light-emitting element, and may include the first to third light sources 101, 102, 103 or the first to third light-emitting elements. The first to third light sources 101, 102, 103 are arranged on a virtual curve VcO. The point where the virtual curve Vc0 contacts or intersects the first light source 101 is the first point Pa, the point where the virtual curve Vc0 contacts or intersects the second light source 102 is the second point Pb, and the point where the virtual curve Vc0 contacts or intersects the third light source 103 may be the third point Pc. Virtual circles Vc forming the first to third convex portions P1, P2, P3 are provided according to the respective curvatures of the first to third convex portions P1, P2, P3. At this time, a virtual first straight line Ya passing through the first point Pa and the center Px of the virtual circle Vc of the first convex portion P1 and a virtual second straight line Yb passing through the second point Pb and the center Px of the virtual circle Vc of the second convex portion P2 may be parallel to each other. The second straight line Yb and a virtual third straight line Yc passing through the third point Pc and the center Px of the virtual circle of the third convex portion P3 may be parallel to each other. That is, the straight lines passing through the centers of the respective light sources 100 and the center Px of the virtual circle Vc having the respective curvatures of the convex portions may be parallel to each other. The first point Pa may be the point where the virtual curve Vc0 intersects the center of the first light source 101. The second point Pb may be the point where the virtual curve Vc0 intersects the center of the second light source 102. A first angle V1 formed by a first tangent Vt1 intersecting the virtual curve Vc0 at the first point Pa and the first straight line Ya may be a first obtuse angle. A second angle V2 formed by a second tangent Vt2 intersecting the virtual curve Vc0 at the second point Pb and the second straight line Yb may be a second obtuse angle. A third angle V3 formed by a third tangent Vt3 intersecting the virtual curve Vc0 at the third point Pc and the third straight line Yc may be a third obtuse angle. The first to third angles V1, V2, V3 are obtuse angles and may be different from each other. For example, the first to third angles may satisfy the relationship V1 < V2 < V3.That is, the angle formed by each straight line passing through each light source 100 and the center (e.g., Px) of each convex portion P0 and each tangent at the point where each of the light sources is tangent to the virtual curve increases toward one direction or the fourth surface direction, or may include a region where the angle increases. The increasing region may be at least one or all of the first to third regions A1, A2, and A3. The first to third tangent lines Vt1, Vt2, and Vt3 may be tangent lines to the virtual curve Vc0 at the center of each of the first to third light sources 103, or may be a straight line connecting the adjacent first and second light sources 101 and 102, a straight line connecting the second and third light sources 102 and 103, or a straight line connecting the third light source 103 and an adjacent light source. That is, the first to third tangent lines Vt1, Vt2, and Vt3 may be extended in the same direction as the straight line connecting the adjacent two light sources 101, 102, and 103.

[0030] A part of the light source 100 is disposed within a virtual circle Vc or circumference that forms each of the convex portions P1, P2, and P3. For example, at least a part of the first light source 101 is disposed within a virtual circle Vc that passes through the first convex portion P1. At least a part of the second light source 102 is disposed within a virtual circle Vc that passes through the second convex portion P2. At least a part of the third light source 103 is disposed within a virtual circle Vc that passes through the third convex portion P3. The virtual circle Vc that forms each of the convex portions P1, P2, and P3 can pass through each of the light sources 100 that face each of the convex portions P1, P2, and P3. The light sources 100 or light-emitting elements are disposed so as to overlap or pass through the circumference of the virtual circle Vc that forms each of the convex portions P1, P2, and P3. At least one of the light sources 100 or light-emitting elements is disposed so as not to overlap with the circumference of the virtual circle Vc that forms each of the convex portions P1, P2, and P3. The curvature of each of the convex portions P1, P2, and P3 may be the same as the curvature of the virtual circle Vc. The maximum width of each of the convex portions P1, P2, and P3 may be the same as or larger than the diameter r0 of the virtual circle Vc. The maximum distance D2 between each of the convex portions P1, P2, and P3 and the light source 100 may be smaller than the diameter r0 of the virtual circle Vc. In the first region A1, the maximum distance D2 between each of the convex portions P1, P2, and P3 and the light source 100 may be smaller than the maximum width of the convex portions P1, P2, and P3. Here, the diameter r0 of the circle Vc formed by the convex portions P1, P2, and P3 may be larger than the thickness Zb of the resin layer 220 disclosed in FIG. 2. The first to third straight lines Ya, Yb, and Yc passing through the vertices Pp of the first to third convex parts P1, P2, and P3 may extend in a normal direction to the tangent line Lt at the vertices Pp of the first to third convex parts P1, P2, and P3, and may have an angle Q3 of 90 degrees. Here, the light sources 100 are arranged at an angle tilted or inclined with respect to the first direction Y or the second direction X, for example, at an angle Q4 less than 90 degrees with respect to the first direction Y. The angle Q4 may be 45 degrees or more and less than 90 degrees. Each of the light sources 100 may be tilted at the angle Q4 and gradually shifted toward the second surface direction. This can be varied according to the surface of the lamp housing or bracket. The bottom point of the concave surface S12 arranged between the convex surfaces S11 may be separated from the virtual curve Vc0.The bottom point of the concave surface S12 may be the point closest to the second surface S2 in the concave surface S12. The apex of the convex portion P0 may be the most protruding point in each convex portion P0 or the point farthest from each light source 100. In terms of the distance between the plurality of light sources 100 and the bottom point of the concave surface S12, the bottom point (or center) of the recessed portion C0 between the first light source 101 and the second light source 102 may be disposed so as to be closer to the first light source 101 than the second light source 102. The bottom point (or center) of the concave surface S12 between the second light source 102 and the third light source 103 may be disposed so as to be closer to the third light source 103 than the second light source 102. That is, the bottom point or center of the concave surface S12 disposed between both light sources 100 from the third surface S3 toward the fourth surface S4 direction may be closer to the light source 100 adjacent in the fourth surface S4 direction than the light source 100 adjacent in the third surface S3 direction.

[0031] 5 and 7, the convex portion P0 in the second region A2 is defined as, for example, the fourth to sixth convex portions P4, P5, and P6, and the light source 100 is defined as, for example, the fourth to sixth light sources 104, 105, and 106. The height D4 of the convex portions P4, P5, and P6 in the second region A2 may be disposed at the same depth as the distance between the straight line L3 connecting two adjacent convex portions and the straight line Vt5 connecting two adjacent light sources 104, 105, and 106. The height D4 of the convex portions P4, P5, and P6 may be smaller than the diameter r0 of the imaginary circle Vc forming each of the convex portions P4, P5, and P6. The depth D2 of the recess portion C0 or the depth of the concave surface S12 is the distance from the apex of the convex portions P4, P5, and P6 to the bottom point of the concave surface S12, and may be the largest in the second region A2 and the smallest in the third region A3. The maximum depth of the recessed portion C0 is a distance D2 between the apexes of the fourth to sixth convex portions P4, P5, and P6 and the bottom point of the recessed portion C0, and may be greater than the diameter r0 of the imaginary circle Vc. The depth of the recessed portion C0 may be smallest in the third region A3 and largest in the second region A2. The depth of the recessed portion C0 is inversely proportional to the magnitude of the inclination of the straight line connecting two adjacent light sources 100. The concave surface S12 disposed in the recessed portion C0 is disposed between the fourth and fifth light sources 104, 105, or between the fifth light source 105 and the sixth light source 106. The bottom point or center of the concave surface S12 disposed between the two light sources 104, 105, and 106 on the third surface S3 toward the fourth surface S4 direction may be adjacent to the fifth light source 105 adjacent to the fourth surface S4 direction more than the fourth light source 104 adjacent to the third surface S3 direction. An extension Sc of the convex surface S11 arranged in the direction of the fourth surface S4 with respect to the fourth light source 104 corresponds to a side surface of the fourth light source 104, and an extension Sc of the convex surface S11 arranged in the direction of the fourth surface S4 with respect to the fifth light source 105 corresponds to the fifth light source 105. Since the extension Sc of the convex surface S11 is further extended in the direction of the second surface S2, it is possible to reduce optical interference between the adjacent light sources 104, 105, and 106. A virtual curve Vc0 or a straight line Vt5 connecting the centers of the adjacent fourth to sixth light sources 104, 105, and 106 may come into contact with the concave surface S12.This can block the light emitted by the adjacent fourth to sixth light sources 104, 105, and 106 from being emitted through the convex portion of the other light sources. Here, the extension portion Sc is provided as a straight line or a planar section to the concave surface S12 as a region outside the region of the imaginary circle of the convex surface S11. A straight line Vx1 connecting the centers Px of the imaginary circles Vc forming the fourth to sixth convex portions P4, P5, and P6 is disposed between a straight line Vt5 connecting the light sources and a straight line L3 connecting the vertices of the convex portions P4, P5, and P6. The straight line Vx1 and the straight line L3 may be parallel. The straight line Vx1 and the straight line Vt5 may be parallel. In the first and second regions A1 and A2, the straight line Vx1 connecting the centers Px of the imaginary circles Vc is disposed in the convex surface direction more than the straight line connecting the concave surface S12. As shown in FIG. 8, in the third region A3, a straight line Vx2 connecting the centers Px of the imaginary circles Vc is disposed closer to the second surface direction than a straight line connecting the concave surfaces S14.

[0032] As shown in FIG. 7, the distance D5 between the straight line connecting the concave surface S12 and the center Px of the virtual circle Vc may be smaller than the radius r1 of the virtual circle Vc. Such distance D5 is a structure that takes into consideration the directivity angle distribution of the fourth to sixth light sources 104, 105, and 106. If the distance D5 is larger than the radius r1 of the virtual circle Vc, the rigidity of the module decreases due to an increase in the depth of the recessed portion C0, or the light blocking effect between adjacent light sources becomes small. The straight line Y1a passing through the center Px of the virtual circle Vc passing through the fourth convex portion P4 and the center of the fourth light source 104, and the straight line Y1b passing through the center Px of the virtual circle Vc passing through the fifth convex portion P5 and the center of the fifth light source 105 may be parallel to each other. In this case, the distance D6 between two adjacent virtual circles Vc may be larger than the minimum width of the recessed portion C0. Here, the minimum width of the recessed portion C0 may be the minimum distance between two adjacent surfaces S11 or the minimum width of the concave surface S12. The distance r2 between the light source 100 (104, 105, 106) and the center Px of the virtual circle Vc may be smaller than the radius r1 of the virtual circle Vc. The distance r2 is the distance between each light source and the center Px of the circle in each convex portion P0, and the light can be arranged to be the same as each other to ensure uniformity of light. The radius r1 of the virtual circle Vc formed by the convex portion P0 may be 5 mm or more, for example, in the range of 5 mm to 15 mm or in the range of 8 mm to 11 mm. Here, the angle V4 between the lines Y1a and Y1b of the virtual straight line Vt5 connecting the adjacent light sources 104, 105, 106 may be an obtuse angle. The angle V4 may be larger than the angles V1, V2, and V3 in FIG. 6.

[0033] 8 and 5, in the third region A3 adjacent to the fourth surface S4, the straight lines Y2a, Y2b, and Y2c passing through the center of the imaginary circle Vc forming the convex portion P0 and the center of each light source 108 may be parallel to each other. Here, the angle V5 between the imaginary straight line Vt6 connecting the adjacent light sources 108 and the straight lines Y2a, Y2b, and Y2c may be an obtuse angle. The angle V5 may be larger than the angle V4 in FIG. 7. Here, the convex portion P0 adjacent to the fourth surface S4 will be referred to as the seventh to ninth convex portions P7, P8, and P9, and the recess portion C0 will be referred to as the seventh and eighth recess portions C7 and C8. The straight line Yx passing through the center Px of the imaginary circle VcX passing through the ninth convex portion P9 and the center of the ninth light source 109 may be parallel to the straight lines Y2a, Y2b, and Y2c. The straight line Vx2 connecting the centers Px of the imaginary circle VcX can be gradually spaced away from the recessed portion C0 or the concave surface S14.

[0034] Here, the eighth recess C8 between the two convex portions P8, P9 adjacent to the fourth surface S4 may form a virtual circle Vs2. The virtual circle Vs2 may be equal to or smaller than the diameter of the virtual circle VcX of each of the convex portions P8, P9. For example, the virtual circle Vs2 formed by the concave surface S14 in the eighth recess C8 is provided with a curvature that is 10% or less different from the diameter of the virtual circle VcX, Vc formed by the ninth convex portion P9. That is, the curvature of the ninth convex portion P9 and the curvature of the last eighth recess C8 may be equal to or have a difference of 10% or less. In this case, the distance D21 between the ninth convex portion P9 and the ninth light source 109 may be smaller than the diameter of the virtual circle Vs2, VcX. That is, when the ninth light source 109 is disposed within the circumference of the imaginary circle VcX and the radius of curvature of the concave surface S14 of the eighth recessed portion C8 is maximum, the distance D21 may be smaller than the diameter of the two adjacent imaginary circles Vs2 and VcX. By providing a larger radius of curvature of the concave surface S14 in the area adjacent to the ninth protrusion P9, the light emitted from the light sources 108 and 109 arranged in the third area A3 is emitted through the concave surface S14.

[0035] In the embodiment of the invention, the curvature of the concave surface S14 or the seventh and eighth recessed portions C7, C8 may gradually increase from the third surface S3 toward the fourth surface S4, or the curvature of the concave surface S14 or the eighth recessed portion C8 adjacent to the fourth surface S4 may be the largest among the curvatures of the concave surface or the recessed portion. This means that the area of ​​the convex portion may become smaller toward the third region, or may be the largest in the third region A3. This means that the curvature of the connecting section of the convex portion may gradually decrease as the convex portion gradually moves toward the second surface direction based on the second direction X. That is, the curvature radius of each concave surface S14 or recessed portion C0 (C7, C8) gradually increases toward the fourth surface S4. Looking at the last ninth convex portion P9 and the seventh convex portion P7 separated from it, the contact area with the circumference of the imaginary circle Vc may gradually decrease toward the ninth convex portion P9. For example, the contact area between the virtual circle VcX passing through the ninth convex portion P9 and the outer edge of the ninth convex portion P9 may be less than 1 / 3 or 1 / 4 of the circumference of the virtual circle VcX. In FIG. 6, the contact area between the virtual circle Vc passing through the first convex portion P1 and the outer edge of the first convex portion P1 may be 1 / 2 or more or 1 / 3 or more of the circumference of the virtual circle Vc. This is because the diameter of the virtual circle Vc is the same, and the area of ​​the convex surface S13 gradually decreases and the area of ​​the concave surface S14 gradually increases as it moves toward the ninth convex portion P9. By gradually reducing the difference in curvature between the convex surface S13 and the concave surface S13 as it moves toward the fourth surface direction and connecting them to each other, each light source 100 in the third area A3 arranged on the virtual curve Vc0 can irradiate light in the same direction as each light source 100 in the first area A1. In addition, the depths of the seventh and eighth recesses C7 and C8 in the third region A3 may be gradually decreased in the direction toward the fourth surface S4. As shown in Figs. 5 and 8, the size of the imaginary circle formed by the concave surface may be gradually increased in the direction toward the fourth surface S4, or the size of the imaginary circle formed by the concave surface may be gradually decreased in the direction toward the third surface S3.

[0036] 9 shows another example of the invention in which the light output surface of the lighting device 200A is not curved. The centers of the light sources 100, 101A, and 101D of the lighting device 200A and the convex portion P21 are arranged toward the target point Ta so that the light from each of the light sources 100, 101A, and 101D can be focused on the target point Ta. That is, the more the light sources 101A and 101D are separated from the light source 100 perpendicular to the target point Ta, the greater the inclination angle. The straight lines passing through the centers of the convex portions P21 and the convex surface S15 corresponding to each of the light sources 100, 101A, and 101D and the centers of the light sources 100, 101A, and 101D can intersect at the target point Ta. The distance between the target point Ta and each of the convex portions P21 can be changed depending on the type of lamp.

[0037] 10A and 10B, the center Dx of each light source 102A is aligned with the center Px of the imaginary circle Vc forming the convex portion Pk1, and in (A), the center Dx of the light source 102A is disposed on the line or circumference of the imaginary circle Vc, and in (B), the center Dx of the light source is disposed within the line or circumference of the imaginary circle Vc. This allows the position of each light source 102A and the size K1 of each light source 102A to be adjusted according to the emission angle emitted from each light source 102A and the curvature radius of each convex portion Pk1.

[0038] In (A) and (B) of FIG. 11, the light source 102B may have a size K2 smaller than the size K1 of the light source 102A disclosed in FIG. 10. In FIG. 11, the size of the light source, that is, the length K2 of the long side may be less than 5 mm, for example, in the range of 2 mm to 4 mm. In FIG. 10, the size K1 of the long side of the light source 102A may be 5 mm or more, for example, in the range of 5 mm to 7 mm. This is because the output angle at the convex surface S31 changes depending on the size of each light source 102A, 102B, and therefore the radius of curvature of the convex portion Pk1 changes.

[0039] 12A and 12B show the case where the convex portion Pk2 is arranged in an elliptical shape having a long length in the second direction X, and the maximum width of the convex portion Pk2 may be greater than the height. This allows the distance between the apex of the convex portion Pk2 or the convex surface S32 and the light source 103A to be narrower. In this case, the length of the elliptical shape in the direction perpendicular to the emission direction of the light source 103A may be greater than the length in the emission direction of the light source 103A.

[0040] 13A and 13B show the case where the convex portion Pk3 is arranged in an elliptical shape having a long length in the first direction Y, and the maximum width of the convex portion Pk3 may be smaller than the height. This allows the distance between the convex portion Pk3 or the convex surface S33 and the light source 103A to be greater. In this case, the length of the elliptical shape in the direction perpendicular to the emission direction of the light source 103A may be smaller than the length in the emission direction of the light source 103A.

[0041] 14A and 14B, the curve of the convex portion Pk4 includes an aspheric shape, and the center Dx of the light source may overlap with or be located inside the line of a circle having an aspheric surface. Such an aspheric convex surface S34 can diffuse light to prevent hot spots at the center side and further increase the light extraction efficiency at the edge side.

[0042] 15(A) to 15(E) are diagrams comparing the distribution of emitted light according to the difference in distance between the center Px of the imaginary circle Vc forming the convex portion and the center Dx of the light source 100. Here, the refractive index of the resin layer may be in the range of 1.2 to 1.7, and the higher the refractive index of the resin layer, the higher the light collection.

[0043] Also, the further away the center Dx of the light source 100 is from the center Px of the virtual circle Vc, the higher the distribution of the condensed light becomes. In other words, looking at the distance between the center Dx of the light source 100 and the center Px of the virtual circle Vc, if the center of the virtual circle V70 or the convex portion P71 is 0, the distance r2 is 5 mm in (A), 2 mm in (B), the same position in (C), -2 mm in (D), and -5 mm in (E). Here, since the center Dx of the light source in (D) and (E) irradiates light at a position further away from the center Px of the virtual circle Vc, the light distribution can be further increased.

[0044] Fig. 16 is a diagram showing the output angle according to the center position of the light source and the convex portion in an embodiment of the invention. Referring to Fig. 16, the incident angle and the output angle at the convex surface S11 can be calculated by Snell's law using parameters such as the position of the light source, the center Px of the virtual circle Vc, the distance between the center Px of the virtual circle Vc and the light source, the refractive index of the resin layer, and the external refractive index.

[0045] Here, N1 is the refractive index of air, 1, and N2 is the refractive index of the resin layer, which may range from 1.2 to 1.7. According to Snell's law, θ1 is the incident angle based on the normal to the tangent line passing through the virtual circle, and θ2 is the exit angle based on the normal. The relational expression is N1×sinθ1=N2×sinθ2, and N1=sinθ2 / sinθ1. Here, the exit angle θ1 can be calculated by a trigonometric function, and θ2 can be calculated from θ1, the distance a between the light source and the center Px of the virtual circle Vc, and each parameter h, α, β, b, and r2, and then applied to Snell's law. Since the light distribution changes depending on such an exit angle, the distance a between the position of the light source and the center of the convex portion can be adjusted according to the light collection distribution.

[0046] As shown in Fig. 17, the lighting device according to the embodiment may be curved convexly in a downward direction or toward the substrate as it approaches the center region based on the third and fourth surfaces S3 and S4, or conversely, may be curved convexly in an upward direction or toward the second reflective layer. As shown in Fig. 18, the lighting device according to the embodiment may include a region that bulges in an upward direction or toward the second reflective layer from the third surface S3 toward the fourth surface S4, and at least one recessed region that is recessed in a downward direction or toward the substrate between the bulging regions or in a region adjacent to the bulging region. The bulging regions and the recessed regions are alternately arranged.

[0047] The above-disclosed embodiments, modifications, or other examples may be selectively mixed with each other or substituted with the structures of other examples, and the above-disclosed embodiments may be selectively applied to each example. In addition, a reflective layer or reflective film made of a resin material may be attached to the second, third, and fourth surfaces S2, S3, and S4, excluding the first surface, of the resin layer 220. Such a reflective layer or reflective film may block light leakage from the non-emission area.

[0048] In the embodiment of the invention, when the thickness of the resin layer 220 in the lighting device is provided to be 3 mm or less or thicker, for example, 3 mm to 6 mm, the increased thickness of the resin layer 220 increases the light emitting area and improves the light distribution. The lighting device according to the embodiment of the invention can be applied to a lamp as shown in Fig. 19. The lamp can be applied to, for example, a head lamp, a width lamp, a side mirror lamp, a fog lamp, a tail lamp, a brake lamp, a daytime running light, a vehicle interior light, a door scuff, a rear combination lamp, or a backup lamp as a vehicle lamp.

[0049] Referring to FIG. 19, the lamp may be configured such that the lighting device 200 having the first and second light sources 101 and 103 disclosed above is combined inside a housing 503 having an inner lens 502. The thickness of the lighting device 200 is such that it can be inserted into the inner width of the housing 503. The width Z3 of the emission part 515 of the inner lens 502 may be equal to or less than twice the thickness of the lighting device 200, so that a decrease in luminous intensity can be prevented. The inner lens 502 may be spaced apart from the front surface of the lighting device 200 by a predetermined distance, for example, 10 mm or more. An outer lens 501 is disposed on the emission side of the inner lens 502. The lamp having such a lighting device 200 is an example, and may be applied to other lamps as a flexible structure, for example, a curved surface or a curved structure when viewed from the side.

[0050] 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. In addition, the features, structures, effects, etc. exemplified in each embodiment can be combined or modified in other embodiments by a person having ordinary skill in the art to which the embodiment belongs. Therefore, the contents related to such combinations and modifications should be interpreted as being included in the scope of the present invention.

Claims

1. A substrate; A plurality of light sources disposed on the substrate; a resin layer disposed on the substrate and the plurality of light sources; a first reflective layer disposed on the resin layer; the resin layer includes an exit surface facing the light source, the emission surface of the resin layer includes a plurality of convex portions, The plurality of light sources are arranged on an imaginary curve and include a first light source and a second light source adjacent to each other, the plurality of protrusions include a first protrusion facing the first light source and a second protrusion facing the second light source, a first imaginary straight line passing through a center of a circle formed by the first convex portion at a first point where the first light source and the imaginary curve are in contact with each other, and a second imaginary straight line passing through a center of a circle formed by the second convex portion at a second point where the second light source and the imaginary curve are in contact with each other, are parallel to each other; an angle formed by a first tangent line that is tangent to the imaginary curve at the first point and the first straight line includes a first obtuse angle; the resin layer is disposed between the substrate and the first reflective layer; The first reflective layer is disposed on an upper surface of the plurality of protrusions.

2. A substrate; a light source disposed above the substrate; a resin layer disposed on the substrate and the light source; a first reflective layer disposed on the resin layer; the resin layer includes an exit surface facing the light source, The light source includes a plurality of light emitting elements, the light exit surface of the resin layer includes a plurality of convex portions corresponding to the plurality of light emitting elements, Each of the plurality of light-emitting elements is disposed on an imaginary curve, a difference in diameter between imaginary circles formed by the plurality of protrusions is within 10%; the resin layer is disposed between the substrate and the first reflective layer; The first reflective layer is disposed on an upper surface of the plurality of protrusions.

3. A substrate; a light source disposed above the substrate; a resin layer disposed on the substrate and the light source; a first reflective layer disposed on the resin layer; the resin layer includes an exit surface facing the light source, The light source includes a plurality of light emitting elements, the light exit surface of the resin layer includes a plurality of convex portions corresponding to the plurality of light emitting elements, Each of the plurality of light-emitting elements is disposed on an imaginary curve, a plurality of straight lines passing through centers of imaginary circles formed by each of the plurality of light-emitting elements and each of the plurality of protrusions, a first angle formed by a tangent line at a point where each of the plurality of straight lines and each of the plurality of light emitting elements are tangent to the imaginary curve includes a region that increases in one direction, the resin layer is disposed between the substrate and the first reflective layer; The first reflective layer is disposed on an upper surface of the plurality of protrusions.

4. an angle between a second tangent line that is tangent to the imaginary curve at the second point and the second straight line includes a second obtuse angle; The lighting device of claim 1 , wherein the second obtuse angle is greater than the first obtuse angle.

5. the plurality of light sources includes a third light source disposed on the imaginary curve; the plurality of protrusions includes a third protrusion facing the third light source, a third imaginary straight line passing through a center of a circle formed by the third convex portion at a third point where the third light source and the imaginary curve are tangent to each other is parallel to the second straight line; an angle formed by a third tangent line that is tangent to the imaginary curve at the third point and the third straight line includes a third obtuse angle; The lighting device of claim 4 , wherein the third obtuse angle is greater than the second obtuse angle.

6. The lighting device according to claim 5 , wherein the imaginary curve passes through a center of the first light source, a center of the second light source, and a center of the third light source.

7. the curvatures of the imaginary circles formed by the plurality of protrusions are identical to each other; The lighting device according to claim 1 , wherein the plurality of protrusions include a hemispherical, elliptical or aspherical shape between the substrate and the first reflective layer.

8. The lighting device according to claim 1 , wherein a diameter of a circle formed by the convex portion is larger than a thickness of the resin layer.

9. The lighting device according to claim 1 , wherein each of the plurality of light sources is disposed within an imaginary circle defined by the convex portion facing the light source.

10. a second reflective layer disposed between the resin layer and the substrate; The lighting device according to claim 1 , wherein a thickness of the resin layer is smaller than a distance from a rear surface to an exit surface.

11. The maximum distance from the center of each of the light-emitting elements to each of the protrusions is the same as each other, each of the plurality of light-emitting elements is disposed on a circumference of the imaginary circle; The lighting device according to claim 2 , wherein a plurality of straight lines passing through a center of each of the plurality of light-emitting elements and a center of each of the imaginary circles are parallel to each other.

12. The plurality of light-emitting elements include first to third light-emitting elements, the plurality of protruding portions include first to third protruding portions, The plurality of straight lines include first to third straight lines, the plurality of tangents include first to third tangents, the first angle formed by the first straight line and the first tangent is a first obtuse angle, the first angle formed by the second straight line and the second tangent is a second obtuse angle; the first angle formed by the third straight line and the third tangent is a third obtuse angle, The lighting device of claim 3 , wherein the second obtuse angle is greater than the first obtuse angle and less than the third obtuse angle.

13. The lighting device according to claim 1 , wherein a straight line connecting adjacent light emitting elements has an inclination with respect to a horizontal line.

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