Lighting device

Abstract

To provide a lighting device having a light wavelength conversion layer at the bottom of a resin layer having a rail shape or a bar shape.SOLUTION: A lighting device includes a reflective member 300, a resin layer 210 disposed on the reflective member, a light emitting element 103 disposed to correspond to one side surface of the resin layer, and a light wavelength conversion layer 250 disposed on one surface of the resin layer. The light wavelength conversion layer 250 includes a main phosphor pattern disposed in a long axis direction of the resin layer 210, and the main phosphor pattern includes a first unit-phosphor pattern disposed in a first region and a second unit-phosphor pattern disposed in a second region. The first region may be located closer to the light emitting element than the second region, and a width of the first unit-phosphor pattern may be less than a width of the second unit-phosphor pattern.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] An embodiment of the invention relates to a rail-shaped lighting device.An embodiment of the invention relates to a light unit, display device or vehicle lamp with rail lighting. [Background technology]

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

[0003] An embodiment of the present invention may provide a lighting device having a shape that is elongated in one direction. An embodiment of the present invention may provide a lighting device having a light wavelength conversion layer on the bottom surface of a rail-shaped or bar-shaped resin layer. An embodiment of the present invention may provide a lighting device having a main phosphor pattern in a center region in the major axis direction and sub-phosphor patterns in edge regions in the major axis direction on the bottom surface of the resin layer. An embodiment of the present invention may provide a light unit, display device, or vehicle lamp having rail lighting. [Means for solving the problem]

[0004] An illumination device according to an embodiment of the invention includes a reflective member, a resin layer disposed on the reflective member, a light-emitting element disposed to correspond to one side of the resin layer, and an optical wavelength conversion layer disposed on one surface of the resin layer, wherein the optical wavelength conversion layer includes a main phosphor pattern disposed in the longitudinal direction of the resin layer, the main phosphor pattern including a first unit phosphor pattern disposed in a first region and a second unit phosphor pattern disposed in a second region, the first region being disposed closer to the light-emitting element than the second region, and the width of the first unit phosphor pattern being smaller than the width of the second unit phosphor pattern.

[0005] According to an embodiment of the invention, the main phosphor pattern may include a third unit phosphor pattern disposed in a third region adjacent to the second region, the second region being disposed between the first region and the third region, and a width of the third unit phosphor pattern may be greater than a width of the first unit phosphor pattern. The first to third unit phosphor patterns may have the same length.

[0006] According to an embodiment of the invention, the light wavelength conversion layer may include a sub-phosphor pattern disposed in the first region and spaced apart from the first unit phosphor pattern. The sub-phosphor pattern may include a plurality of unit sub-phosphor patterns spaced apart from each other, and the plurality of unit sub-phosphor patterns may have the same cross-sectional area.

[0007] According to an embodiment of the invention, the separation distances between the plurality of unit sub-phosphor patterns may be the same, and the phosphor concentration of the first unit phosphor pattern may be the same as the phosphor concentration of the second unit phosphor pattern.

[0008] According to an embodiment of the invention, the light emitting device includes a colored optical layer disposed on the resin layer, and the colored optical layer can emit light emitted from the light wavelength conversion layer and limit the emission of light in the same wavelength band as the light emitted from the light emitting element.

[0009] An illumination device according to an embodiment of the invention includes a reflective member, a resin layer disposed on the reflective member, a light-emitting element disposed to correspond to one side of the resin layer, and an optical wavelength conversion layer disposed on one surface of the resin layer, wherein the optical wavelength conversion layer includes a main phosphor pattern disposed in a major axis direction of the resin layer and a sub-phosphor pattern spaced apart from the main phosphor pattern, the main phosphor pattern including a first unit phosphor pattern disposed in a first region, and the sub-phosphor pattern including a plurality of unit sub-phosphor patterns disposed in the first region and spaced apart from the first unit phosphor pattern.

[0010] According to an embodiment of the invention, the optical wavelength conversion layer is disposed between the resin layer and the reflecting member.

[0011] An illumination device according to an embodiment of the invention includes a resin layer, a light-emitting element arranged to correspond to one side of the resin layer, an optical wavelength conversion layer arranged on one side of the resin layer, and a colored optical layer arranged on the resin layer, wherein the optical wavelength conversion layer includes regions having different concentrations of phosphor, and the colored optical layer can emit light that has passed through the phosphor and limit the emission of light in the same wavelength band as the light emitted from the light-emitting element.

[0012] According to an embodiment of the invention, the optical wavelength conversion layer may include a first region in which the phosphor is disposed at a first concentration, a second region in which the phosphor is disposed at a second concentration greater than the first concentration, and a third region in which the phosphor is disposed at a third concentration greater than the second concentration. According to an embodiment of the invention, the light emitted from the light emitting element, wavelength-converted in the first to third regions, and passed through the colored optical layer may have a uniform distribution. According to an embodiment of the invention, the light emitting element emits blue light, and the light from the light emitting element that passes through the optical wavelength conversion layer emits light in a wavelength band of 615 nm to 650 nm, and the colored optical layer is formed in red. [Effects of the Invention]

[0013] According to the embodiments of the present invention, the light distribution of the rail lighting can be improved, and wavelength conversion efficiency can be improved. According to the embodiments of the present invention, flexible rail lighting can be arranged and applied to various lamps. The optical reliability of the rail lighting according to the embodiments of the present invention can be improved, and rail-shaped lighting can be applied as a line-emitting element in vehicle lamps, light units, and various display devices. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is an example of an exploded perspective view showing a lighting device according to an embodiment of the invention. [Figure 2] FIG. 2 is an example of a combined perspective view of FIG. [Figure 3] 3 is a cross-sectional view of the lighting device of FIG. 2 taken along a first direction of the long axis. [Figure 4] 4 is a cross-sectional view of the lighting device of FIG. 2 taken along a second direction of the minor axis. [Figure 5] FIG. 5 is another example of the lighting device of FIG. [Figure 6] 6A, 6B, and 6C are diagrams showing examples of the arrangement of light-emitting modules in the lighting device of FIG. [Figure 7] FIG. 7 shows another example of the lighting device of FIG. [Figure 8] FIG. 8 is a diagram showing the arrangement of light emitting elements and resin layers in a lighting device according to an embodiment of the present invention. [Figure 9] 9A and 9B are views of the resin layer of FIG. 8 as seen from the first surface on the incident side and the second surface on the opposite side. [Figure 10] FIG. 10 is a diagram showing the pattern of the optical wavelength conversion layer disposed on the bottom surface of the resin layer of FIG. [Figure 11] 11A to 11D are examples of cross-sectional side views of the resin layer taken along lines AA, BB, CC, and DD in FIG. [Figure 12] FIG. 12 shows another example of the optical wavelength conversion layer of FIG. [Figure 13]FIG. 13 shows a first modified example of the optical wavelength conversion layer disposed on the bottom surface of the resin layer in FIG. [Figure 14] FIG. 14 shows a second modification of the resin layer and the optical wavelength conversion layer of FIG. [Figure 15] 15A and 15B show a third modified example of the optical wavelength conversion layer disposed on the bottom surface of the resin layer in FIG. [Figure 16] 16A and 16B show another example of a lighting device according to an embodiment of the invention. [Figure 17] FIG. 17 shows an example of a vehicle to which the lighting device according to the embodiment of the invention is applied. [Figure 18] FIG. 18 is a view showing the taillights of the vehicle of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will enable those skilled in the art to easily carry out the present invention. However, it should be understood that the embodiments described herein 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. When describing the operating principles of preferred embodiments of the present invention in detail, detailed descriptions of related well-known functions or configurations will be omitted if they are deemed to unnecessarily interfere with the gist of the present invention. The terms used below are defined in consideration of the functions of the present invention, and the meanings of each term should be interpreted based on the overall content of this specification. The same reference numerals will be used throughout the drawings to refer to parts having similar functions and functions. The lighting device according to the present invention can be applied to various lamp devices requiring illumination, such as vehicle lamps, lighting devices for mobile equipment, household lighting devices, and industrial lighting devices. For example, when applied to vehicle lamps, the lighting device of the present invention can be used in headlamps, sidelights, side mirror lights, 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, dashboard lighting, etc. The lighting device of the present invention can also be used in indoor and outdoor advertising devices, display devices, mobile devices, and various trains. It can also be used in all lighting-related and advertising-related fields that are currently developed and commercialized, or that will be realized through future technological developments. The following embodiments will be made clearer by the accompanying drawings and the description of the embodiments. In the description of the embodiments, when it is stated that each layer (film), region, pattern, or structure is formed "on" or "under" a substrate, each layer (film), region, pad, or pattern, "on" and "under" include those formed "directly" or "with another layer interposed therebetween." Furthermore, the reference to "on" or "under" each layer is based on the drawings.

[0016] <Example> FIG. 1 is an example of an exploded perspective view showing a lighting device according to an embodiment of the invention, FIG. 2 is an example of a combined perspective view of FIG. 1, FIG. 3 is a cross-sectional view of the lighting device of FIG. 2 in the first direction of the long axis, FIG. 4 is a cross-sectional view of the lighting device of FIG. 2 in the second direction of the short axis, FIG. 5 is another example of the lighting device of FIG. 3, (A), (B), and (C) of FIG. 6 are drawings showing an example of the arrangement of light-emitting modules in the lighting device of FIG. 2, FIG. 7 is another example of the lighting device of FIG. 4, FIG. 8 is a drawing showing the arrangement of light-emitting elements and resin layers in a lighting device according to an embodiment of the invention, (A) and (B) of FIG. 9 are drawings seen from the first incident side surface and the second opposite side surface of the resin layer of FIG. 8, FIG. 10 is a drawing showing the pattern of the light wavelength conversion layer arranged on the bottom surface of the resin layer of FIG. 8, and (A)-(D) of FIG. 11 are examples of side cross-sectional views of the resin layer of FIG. 10 along lines AA, BB, CC, and DD.

[0017] 1 to 11, a lighting device 200 according to an embodiment of the invention includes a light emitting element 103, a resin layer 210, and a light wavelength conversion layer 250. The lighting device 200 may include a reflective member 300 in which the resin layer 210 is housed. The lighting device 200 can provide point light emitted from the light emitting element 103 as track lighting or line lighting. The light may include at least one of blue, green, red, yellow, and white, for example, white or red. When the lighting device 200 emits white light, it can be applied to a vehicle lamp with a red lens or used as indoor or outdoor lighting. When the lighting device 200 emits red light, it can visually indicate whether it is on or off. The lighting device 200 may be a flexible module or a rigid module. The lighting device 200 can be flat or bendable in at least one of first and second directions (X and Y).

[0018] The light emitting device 103 may include an LED (Light Emitting Diode), an Organic EL (Electroluminescence), or an OLED (Organic LED). The light emitting device 103 may include an LED chip or a package in which an LED chip is packaged with a molding member. The light emitting device 103 may emit at least one of blue, green, red, and white light. The light emitting device 103 may emit blue light or a wavelength in the range of 400 nm to 500 nm. The packaged device may include a phosphor layer or a molding member covering a surface of the LED chip. The phosphor layer may be a layer to which phosphor is added, and the molding member may be a transparent resin containing phosphor or a transparent resin without impurities such as phosphor. The light emitting device 103 is disposed on one side of the printed circuit board 101 and is electrically connected to the printed circuit board 101. One or three or less light emitting devices 103 may be provided on the printed circuit board 101.

[0019] The printed circuit board 101 is disposed parallel to the first incident surface 22 of the resin layer 210 or perpendicular to the bottom surface 21 of the resin layer 210. The light emitting element 103 and the printed circuit board 101 can be defined as a light emitting module 100.

[0020] As shown in FIGS. 7A and 7B, the light emitting device 103 of the light emitting module 100 may emit light from its front or five sides, and a heat sink 105 may be coupled to the other side of the printed circuit board 103. Alternatively, as shown in FIG. 7C, the printed circuit board 101 may be disposed in a direction perpendicular to the incident side of the resin layer 210 (i.e., horizontally), and the light emitting device 103A may be implemented as a package or LED chip that emits light from one side (the side facing the resin layer) on the upper surface of the printed circuit board 101. The printed circuit board 101 may include, for example, a resin-based printed circuit board (PCB), a metal core PCB, a flexible PCB, a ceramic PCB, or an FR-4 board. The printed circuit board 101 may be made of a flexible or rigid material. The printed circuit board 101 may be made of an insulating or non-insulating material, or a thermally or electrically conductive material. The printed circuit board 101 has a circuit pattern disposed on its upper and / or lower surface, and the circuit pattern may include a plurality of pads disposed in an area corresponding to the light emitting element 103. The circuit pattern on the printed circuit board 101 may be disposed on its upper surface or on its upper and lower surfaces. A protective layer made of a reflective material is disposed on the upper surface of the printed circuit board 101. The protective layer may be a solder resist material or an insulating material layer, and may be a PSR (Photo solder resist) material. The protective layer may be a layer that protects the circuit pattern. The protective layer and the circuit pattern are provided on the printed circuit board 101.

[0021] The light emitting element 103 may face the first incident surface 22 of the resin layer 210. The light emitting element 103 may be disposed at or below the center of the first surface 22 of the resin layer 210 for light incidence efficiency. The printed circuit board 101 may face the first incident surface 22 of the resin layer 210. The first surface 22 of the resin layer 210 may be spaced apart from the light emitting element 103 by 50 μm or more, for example, in the range of 50 μm to 400 μm or 50 μm to 200 μm, to improve light incidence efficiency. As another example, the light emitting element 103 may be embedded on one side of the resin layer 210, as shown in FIG. 5. In this case, optical loss between the resin layer 210 and the light emitting element 103 can be reduced.

[0022] The resin layer 210 may include a transparent resin material. The resin layer 210 may include a diffusing agent therein, but is not limited thereto. The refractive index of the resin layer 210 may be 1.70 or less, for example, in the range of 1.25 to 1.70.

[0023] The resin layer 210 is provided in the form of a rail or a line having a long length in one direction. The first direction X of the resin layer 210 may be a major axis direction, and the second direction Y may be a minor axis direction. The length in the first direction X may be 10 times or more greater than the width in the second direction Y, for example, in the range of 10 to 200 times. The resin layer 210 may include a bottom surface 21, a first surface 22 on the incident side, a second surface 24 opposite to the first surface 22, a side surface 23, and a top surface 25 opposite to the bottom surface 21. The bottom surface 21, the side surface 23, and the top surface 25 are arranged long in the first direction X.

[0024] The bottom surface 21 of the resin layer 210 may be flat or have a concave-convex pattern in a portion thereof. The first surface 22 may be a vertical flat surface or an inclined surface. The second surface 24 may be a vertical or inclined surface, or may have a reflective layer disposed thereon. The side surfaces 23 of the resin layer 210 are disposed between the bottom surface 21 and the top surface 25 on both sides of the resin layer 210 and are connected to the curved lower ends of the top surface 25. When the lower end of the top surface 25 extends to the boundary with the bottom surface 21, the side surfaces 23 may become part of the top surface. The top surface 25 may include a curved surface. The top surface 25 may have a hemispherical cross section. The top surface 25 may be a surface from which light is emitted. The side surfaces 23 extend perpendicularly from both edges of the bottom surface 21, and the top surface 25 may be curved or hemispherical and bulge at the upper ends of both side surfaces 23. The both side surfaces 23 and the top surface 25 may have a long length in one direction, i.e., the same length as the resin layer 210.

[0025] The resin layer 210 may include at least one material selected from the group consisting of silicone, silicone molding compound (SMC), epoxy, and epoxy molding compound (EMC). The resin layer 210 may include a UV (ultraviolet) curable resin or a thermosetting resin material, such as PC, OPS, PMMA, or PVC. For example, the main material of the resin layer 210 may be a resin material containing urethane acrylate oligomer as its main ingredient. For example, a mixture of urethane acrylate oligomer, which is a synthetic oligomer, and a polymer type such as polyacrylic may be used. Of course, a monomer containing a low-boiling point dilution type reactive monomer such as IBOA (isobornyl acrylate), HPA (hydroxylpropyl acrylate), or 2-HEA (2-hydroxyethyl acrylate) may be further included, and a photoinitiator (e.g., 1-hydroxycyclohexyl phenyl ketone) or an antioxidant may be added as an additive.

[0026] 8 and 9, the optical wavelength conversion layer 250 is disposed on at least one surface of the resin layer 210. The optical wavelength conversion layer 250 may be attached to the bottom surface 21 of the resin layer 210. The optical wavelength conversion layer 250 may be attached to the bottom surface 21 of the resin layer 210 in the form of a pre-fabricated film, or may be formed on the bottom surface 21 by a printing method, but is not limited thereto.

[0027] The optical wavelength conversion layer 250 is disposed on the bottom surface 21 of the resin layer 210 from a first surface 22 adjacent to the light emitting element 103 to a second surface 24. The optical wavelength conversion layer 250 may include a red or yellow phosphor, or may include red and yellow phosphors. The optical wavelength conversion layer 250 converts the wavelength of the incident first light and emits the second light. As a result, the resin layer 210 can emit a third light that is a mixture of the first light and the second light. The first light may include at least one of blue, green, and red. The second light may have a dominant wavelength in the range of 615 nm to 650 nm or may be red or yellow light. The third light may be red or white light.

[0028] 10 and 11 , the optical wavelength conversion layer 250 may be spaced apart from the first surface 22 and the second surface 24 of the bottom surface 21 of the resin layer 210. When the optical wavelength conversion layer 250 is exposed on the first surface 22 and the second surface 24, adhesive strength at both ends of the optical wavelength conversion layer 250 is reduced, so the optical wavelength conversion layer 250 may be spaced apart by at least 1 mm from the lower ends of the first and second surfaces 22 and 24. When both side surfaces 23 of the bottom surface 21 of the resin layer 210 are exposed, adhesive strength is reduced, so the optical wavelength conversion layer 250 may be spaced apart by at least 1 mm from the lower ends of the side surfaces 23. The width of the optical wavelength conversion layer 250 in the width direction (or minor axis direction) adjacent to the first surface 22 may be smaller than the width of the light emitting element 103, and the width of the optical wavelength conversion layer 250 in the second surface 23 may be 1.1 times or more, for example, in the range of 1.1 to 5 times or 1.1 to 3.5 times, of the width of the light emitting element 103. This allows a uniform wavelength conversion distribution to be provided according to the luminous intensity difference of the optical wavelength conversion layer 250. If the difference is outside the above range, the wavelength conversion efficiency on the incident side will be low or the improvement in wavelength conversion efficiency will be minimal compared to the increase in the phosphor area in the region adjacent to the second surface 23.

[0029] The light wavelength conversion layer 250 may include a main phosphor pattern P10 arranged in a major axis direction X of the resin layer 210. The length of the main phosphor pattern P10 in the major axis direction X may be smaller than the length L0 of the resin layer 210 in the major axis direction. The maximum width W1 of the main phosphor pattern P10 may be smaller than the width W0 of the resin layer 210 in the minor axis direction.

[0030] The length L0 of the resin layer 210 in the major axis direction may be 300 mm or more, for example, in the range of 300 mm to 600 mm or 300 mm to 450 mm. The width W0 of the resin layer 210 may be 5 mm or more, for example, in the range of 5 mm to 20 mm or 5 mm to 10 mm, and may be provided as a rail light or a line light of 10 mm or less. Here, when the resin layer 210 is longer than 600 mm, light emitting elements may be disposed on the first and second surfaces 22 and 24 of the resin layer 210, respectively, and the optical wavelength conversion layers 250 described below may be disposed symmetrically on the bottom surface of the resin layer 210 with respect to the center of the bottom surface.

[0031] The main phosphor pattern P10 may be divided into a plurality of regions in the major axis direction X and may include unit phosphor patterns P1, P2, P3, P4, and P5 arranged in each region. The unit phosphor patterns P1, P2, P3, P4, and P5 may have different pattern widths in different regions. The different regions may be divided into three or more regions, and arranged in the order of a first region adjacent to the light emitting device, followed by second and third regions adjacent thereto. For example, the width of the first unit phosphor pattern P1 arranged in the first region adjacent to the first surface 22 of the resin layer 210 may be smaller than the widths of the unit phosphor patterns P2, P3, P4, and P5 arranged in other regions adjacent to the second surface 24.

[0032] The unit phosphor patterns P1, P2, P3, P4, and P5 may have a pattern width that gradually decreases in a region closer to the first surface 22 from the center of the bottom surface of the resin layer 210, and may have a pattern width that gradually increases in a region closer to the second surface 24. The second, third, fourth, and fifth unit phosphor patterns P2, P3, P4, and P5 of the unit phosphor patterns are arranged in the second, third, fourth, and fifth regions, respectively, with the second region being arranged between the first and third regions and the fourth region being arranged between the third and fifth regions.

[0033] The width of the second unit phosphor pattern P2 may be larger than the width of the first unit phosphor pattern P1 and smaller than the width of the third unit phosphor pattern P3. The width of the third unit phosphor pattern P3 may be larger than the widths of the first and second unit phosphor patterns P1 and P2 and smaller than the width of the fourth unit phosphor pattern P4. The width of the fourth unit phosphor pattern P4 may be larger than the widths of the first, second, and third unit phosphor patterns P1, P2, and P3 and smaller than the width of the fifth unit phosphor pattern P5. The width W1 of the fifth unit phosphor pattern P5, which is the last pattern, may be larger than the widths of the first, second, third, and fourth unit phosphor patterns P1, P2, P3, and P4 and smaller than the floor width W0 of the resin layer 210. The phosphor concentrations of the different unit phosphor patterns P1, P2, P3, P4, and P5 may be the same as each other. As another example, the first phosphor concentrations of the first and second unit phosphor patterns P1 and P2 may be the same as each other, or the third, fourth, and fifth unit phosphor patterns P3, P4, and P5 may have a second phosphor concentration that is higher than the first phosphor concentration.

[0034] Here, the lengths L1, L2, and L3 in the first direction X of the first to third unit phosphor patterns P1, P2, and P3 can be arranged to be the same as each other to provide a uniform wavelength conversion distribution in the incident side region. As another example, the lengths L1, L2, and L3 in the first direction X of the first to third unit phosphor patterns P1, P2, and P3 are arranged in the relationship of L1 < L2 < L3, and the unit phosphor pattern with a narrower pattern width is arranged with a smaller length so that more incident light can travel toward the second surface 22. As another example, the lengths L1, L2, and L3 in the first direction X of the first to third unit phosphor patterns P, P2, and P3 are arranged in the relationship of L1 > L2 > L3, and the unit phosphor pattern with a narrower pattern width is arranged with a longer length to reduce the hot spot problem caused by the incident light amount.

[0035] The light wavelength conversion layer 250 may include sub-phosphor patterns P20 disposed in the first region and spaced apart from the first unit phosphor pattern P1. A plurality of sub-phosphor patterns P20 are arranged along both sides of the resin layer 210. The sub-phosphor patterns P20 may contain the same phosphor as the phosphor added to the main phosphor pattern P10. As another example, the sub-phosphor patterns P20 may contain a phosphor different from the phosphor added to the main phosphor pattern P10. In this case, the main and sub-phosphor patterns P10 and P20 may be disposed with the same area or with an area difference of 20% or less.

[0036] The sub-phosphor pattern P20 may include a plurality of unit sub-phosphor patterns P11 and P12 spaced apart from each other, and the cross-sectional areas of the unit sub-phosphor patterns P11 and P12 may be the same. The unit sub-phosphor patterns P11 and P12 may have the same shape or size. The first and second unit sub-phosphor patterns P11 and P12 may have the same phosphor concentrations. The unit sub-phosphor patterns P11 and P12 may be spaced apart from each other by a distance greater than the length or width of each sub-phosphor pattern P11 and P12. The unit sub-phosphor patterns P11 and P12 may include a first unit sub-phosphor pattern P11 disposed on one side of the resin layer and a second unit phosphor pattern P12 disposed on the other side. The first and second unit phosphor patterns P11 and P12 may be spaced apart from each other and may overlap at least partially in the minor axis direction.

[0037] 10, the region of the sub-phosphor pattern P20 is disposed within a distance L11 from the first surface 22 of the resin layer 210 to one end of the third unit phosphor pattern P3. The distance L11 may be 50% or less, for example, in the range of 30% to 50%, of the length L0 of the resin layer 210. The region of the sub-phosphor pattern P20 is disposed around the first and second unit phosphor patterns P1 and P2, which have a relatively narrow pattern width, to complement the function of the main phosphor pattern P10 and the wavelength conversion efficiency in the incident side region of the resin layer 210.

[0038] The optical wavelength conversion layer 250 can provide uniform wavelength conversion efficiency over the entire area by the main phosphor pattern P10 and the sub phosphor pattern P20, and the light intensity is uniformly distributed in the range of 50% or more or 50% to 75%. Furthermore, the light converted by the optical wavelength conversion layer 250 is emitted, providing a rail light or a line light with uniform intensity.

[0039] 1, 2 and 4, the reflecting member 300 has a receiving groove 310 therein and includes a bottom 301 and a sidewall 305. The reflecting member 300 has an open top, and the receiving groove 310 receives the resin layer 210 with the optical wavelength conversion layer 250 disposed therein. The reflective member 300 has one open side on which the printed circuit board 101 is disposed, and the light emitting element 103 may face the first incident surface 22 of the resin layer 210. The reflective member 300 may be made of a material including a reflective resin, such as a plastic resin. The optical wavelength conversion layer 250 is disposed between the reflective member 300 and the resin layer 210.

[0040] 6, a colored optical layer 360 is provided on the resin layer 210. The colored optical layer 360 emits the second light wavelength-converted by the optical wavelength conversion layer 250 and blocks or absorbs the first light or light of the same wavelength band emitted from the light emitting element 103. As a result, the colored optical layer 360 emits the second light, for example, red light. The colored optical layer 360 is formed of a red material and can transmit red light and restrict light with wavelengths shorter than red. The colored optical layer 360 can be attached to the reflective member 300 or can be separated from it. An optical member 350 is disposed between the colored optical layer 360 and the resin layer 210 and can diffuse the incident first and second light.

[0041] 12 , the main phosphor patterns P10 of the optical wavelength conversion layer 250 are discontinuously arranged by gaps P0 along the major axis direction, and the intervals between the gaps P0 may become narrower as the distance from the first surface 22 of the resin layer 210 increases. The intervals between the gaps P0 may become wider as the distance from the second surface 22 of the resin layer 210 increases. The gaps P0 are areas where the optical wavelength conversion layer 250 has been removed, and the bottom surface 21 may be exposed.

[0042] As shown in FIG. 13 , the light wavelength conversion layer 250 has a main phosphor pattern P10a formed with a width that is continuous or gradually increasing from the first surface 22 to the second surface 24. The width of the relatively wide unit phosphor pattern P5A of the main phosphor pattern P10a may increase linearly or nonlinearly. While the resin layer 210 has been described above as having the same width on the first surface 22 and the second surface 24, another example is shown in FIG. 14 . As shown in FIG. 14 , the resin layer 210 may have a structure in which the width of the first surface 22 is narrower and the width of the second surface 24 is wider. The width of the resin layer 210 may increase linearly or nonlinearly as it approaches the second surface 24. That is, the distance between the first and second side surfaces 23A and 23B of the resin layer 210 may increase linearly or nonlinearly as it approaches the second surface 24. The first and second unit sub phosphor patterns P11 and P12 of the sub phosphor pattern P20 are arranged on the same straight line or in a diagonal line at the same intervals as the first and second side surfaces 23A and 23B. Thus, the intervals between the first and second unit sub phosphor patterns P11 and P12 in the second direction Y may be the same or may become wider as they approach the second surface 22 of the resin layer 210.

[0043] As shown in FIG. 15A, the optical wavelength conversion layer 250B may have different phosphor concentrations in the regions PA1, PA2, PA3, and PA4. The phosphor concentration may be lower in a region closer to the first surface 22 of the resin layer 210 and higher in a region further away. As another example, the phosphor concentration may gradually increase from the first surface 22 to the second surface 24 of the resin layer 210. The lengths of the regions PA1, PA2, PA3, and PA4 in the optical wavelength conversion layer 250B may be the same or may increase as they approach the second surface 24. The widths of the regions PA1, PA2, PA3, and PA4 in the optical wavelength conversion layer 250B may be the same or may increase as they approach the second surface 24.

[0044] In addition to the phosphor concentration, the plurality of regions PA1, PA2, PA3, and PA4 disclosed in the embodiments of the invention may be provided with different unit areas of the wavelength conversion regions in each region, different sizes of the dot or line patterns of the wavelength conversion regions in each region, and different intervals or gaps between the wavelength conversion regions. As a result, the area or phosphor concentration of the phosphor regions may increase continuously or discontinuously in each partial region from the first surface 22 to the second surface 24 of the resin layer 210.

[0045] 15B, the optical wavelength conversion layer 250 may include a main phosphor pattern P10b having different phosphor concentrations in the plurality of regions PA1, PA2, PA3, and PA4. The phosphor concentration may be lower in a region closer to the first surface 22 of the resin layer 210 and higher in a region farther away. As another example, the phosphor concentration may gradually increase from the first surface 22 to the second surface 24 of the resin layer 210. The optical wavelength conversion layer 250 may include sub-phosphor patterns P20 (P11, P12) arranged on both sides of the first and second regions PA1 and PA2 of the plurality of regions PA1, PA2, PA3, and PA4. The lengths of the regions PA1, PA2, PA3, and PA4 in the optical wavelength conversion layer 250 may be the same as each other or may increase as they approach the second surface 24. The widths of the regions PA1, PA2, PA3, and PA4 in the optical wavelength conversion layer 250 may be the same as each other or may increase as they approach the second surface 24.

[0046] As shown in FIG. 16 , the plurality of optical wavelength conversion layers 251, 252 disposed on the bottom surfaces of the resin layers 221, 222 may be arranged in the minor axis direction, and each of the plurality of optical wavelength conversion layers 251, 252 may have a long length in the major axis direction. The first optical wavelength conversion layer 251 is disposed in the first region 21A of the bottom surface 21 of the one resin layer 221, has main and sub phosphor patterns P101, P201, and is arranged as shown in the structure of FIG. 10 . For the first optical wavelength conversion layer 251, refer to the description of FIG. 10 . The upper surface 25A of the resin layer 221 may be curved. The second optical wavelength conversion layer 252 is disposed in the second region 21B of the bottom surface 21 of the resin layer 222, has main and sub phosphor patterns P102, P202, and may be arranged in the inverse structure of FIG. 10 . The sub-phosphor pattern P202 may include first and second unit sub-phosphor patterns P15 and P16 arranged from the second surface 22, and are arranged symmetrically with respect to the first light wavelength conversion layer 251, so please refer to the description of FIG. 10. The upper surface 25B of the resin layer 221 may be curved.

[0047] The upper surfaces 25A and 25B of the resin layers 221 and 222 may be arranged in a hyperbolic shape and may have a long length in the major axis direction. The boundary 25C between the resin layers 221 and 222 may be bonded to each other or may be an integral region, thereby blocking optical interference between them or allowing some light to travel to opposite regions. The resin layers 221 and 222 have a first light emitting element 103 disposed on one side of the first optical wavelength conversion layer 251 on the first surface 22 and a second light emitting element 104 disposed on one side of the second optical wavelength conversion layer 252 on the second surface 24.

[0048] The optical wavelength conversion layers 251, 252 disclosed above may have the same width, a linearly increasing width, or a non-linearly increasing width, or the gaps (P0 in FIG. 12) may be arranged at gradually decreasing or increasing intervals. The interval between the gaps may not be adjusted, and the width of the gaps may gradually increase toward the second surface 24.

[0049] FIG. 17 is a plan view of a vehicle to which a vehicle lamp incorporating a lighting device according to an embodiment of the present invention is applied, and FIG. 18 is a view showing a taillight of the vehicle of FIG.

[0050] 17 and 18, in a moving body or vehicle 900, a front lamp 850 may include one or more lighting modules, and the activation timing of these lighting modules may be individually controlled to provide not only a normal headlight function but also additional functions such as a welcome light or a celebration effect when a driver opens a vehicle door. The lamp may be applied to daytime running lights, high beams, low beams, fog lights, or turn signals. In the vehicle 900, a tail light 800 is arranged with multiple lamp units 810, 812, 814, and 816 supported by a housing. For example, the lamp units 810, 812, 814, and 816 may include a first lamp unit 810 arranged on the outside, a second lamp unit 814 arranged around the inside of the first lamp unit 810, and third and fourth lamp units 814 and 816 arranged inside the second lamp unit 814, respectively. The first to fourth lamp units 810, 812, 814, and 816 may selectively be applied to the lighting devices disclosed in the embodiments, and red or white lens covers may be disposed on the exterior of the lighting devices to suit the lighting characteristics of the lamp units 810, 812, 814, and 816. The lighting devices disclosed in the embodiments applied to the lamp units 810, 812, 814, and 816 may emit surface light with a uniform distribution. The first and second lamp units 810 and 812 may have at least one of a curved shape, a linear shape, an angular shape, an inclined shape, and a flat shape, or a combination thereof. One or more of the first and second lamp units 810 and 812 may be disposed in each tail light. The first lamp unit 810 may be used as a tail light, the second lamp unit 812 as a brake light, the third lamp unit 814 as a backup lamp, and the fourth lamp unit 816 as a turn signal lamp.

[0051] The features, structures, effects, etc. described in the above embodiments are included in at least one embodiment of the present invention and are not necessarily limited to one embodiment. Furthermore, the features, structures, effects, etc. exemplified in each embodiment can be combined or modified in other embodiments by a person skilled 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 reflective member; a resin layer disposed on the reflecting member; a light-emitting element disposed corresponding to one side surface of the resin layer; an optical wavelength conversion layer disposed on one surface of the resin layer; Including, the light wavelength conversion layer includes a main phosphor pattern arranged in the longitudinal direction of the resin layer, the main phosphor pattern includes a first unit phosphor pattern arranged in a first region and a second unit phosphor pattern arranged in a second region; the first region is disposed closer to the light emitting element than the second region, The width of the first unit phosphor pattern is smaller than the width of the second unit phosphor pattern.

2. the main phosphor pattern includes a third unit phosphor pattern disposed in a third region adjacent to the second region, the second region is disposed between the first region and the third region, The lighting device of claim 1 , wherein the width of the third unit phosphor pattern is greater than the width of the first unit phosphor pattern.

3. The lighting device of claim 2, wherein the first, second, and third unit phosphor patterns have the same length.

4. The lighting device of claim 1 , wherein the light wavelength conversion layer is disposed in the first region and includes sub-phosphor patterns spaced apart from the first unit phosphor patterns.

5. The sub-phosphor pattern includes a plurality of unit sub-phosphor patterns spaced apart from each other, The lighting device according to claim 4 , wherein the cross-sectional areas of the plurality of unit sub-phosphor patterns are the same as each other.

6. The lighting device according to claim 5 , wherein the separation distances between the plurality of unit sub-phosphor patterns are the same.

7. The lighting device of claim 1 , wherein a phosphor concentration of the first unit phosphor pattern is the same as a phosphor concentration of the second unit phosphor pattern.

8. a colored optical layer disposed on the resin layer; 3. The lighting device according to claim 1, wherein the colored optical layer emits light emitted from the optical wavelength conversion layer and restricts emission of light in the same wavelength band as the light emitted from the light emitting element.

9. A reflective member; a resin layer disposed on the reflecting member; a light-emitting element disposed corresponding to one side surface of the resin layer; an optical wavelength conversion layer disposed on one surface of the resin layer; Including, the light wavelength conversion layer includes a main phosphor pattern disposed in a major axis direction of the resin layer and a sub phosphor pattern spaced apart from the main phosphor pattern, the main phosphor pattern includes a first unit phosphor pattern disposed in a first region, The sub-phosphor pattern is disposed in the first region and includes a plurality of unit sub-phosphor patterns spaced apart from the first unit phosphor pattern.

10. The lighting device according to claim 9 , wherein the light wavelength conversion layer is disposed between the resin layer and the reflecting member.

11. A resin layer; a light-emitting element disposed corresponding to one side surface of the resin layer; an optical wavelength conversion layer disposed on one surface of the resin layer; a colored optical layer disposed on the resin layer; and Including, the light wavelength conversion layer includes regions having different concentrations of phosphor; The colored optical layer emits light that has passed through the phosphor and limits emission of light in the same wavelength band as the light emitted from the light-emitting element.

12. 12. The lighting device of claim 11, wherein the light wavelength conversion layer includes a first region in which the phosphor is arranged at a first concentration, a second region in which the phosphor is arranged at a second concentration greater than the first concentration, and a third region in which the phosphor is arranged at a third concentration greater than the second concentration.

13. 13. The lighting device according to claim 12, wherein the light emitted from the light emitting element, wavelength converted in the first to third regions, and passed through the colored optical layer are uniform.

14. the light-emitting element emits blue light; the light from the light-emitting element that has passed through the optical wavelength conversion layer includes a wavelength band in a range of 615 nm to 650 nm, The lighting device according to claim 12 , wherein the colored optical layer is formed in red.

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