Lighting device

Abstract

A lighting device disclosed in an embodiment of the present invention may comprise: a substrate; a plurality of light sources arranged on the substrate and each having adjacent first and second light-emitting elements; a resin layer covering the plurality of light sources; a diffusion layer disposed on the resin layer; and a plurality of light-shielding units disposed between the resin layer and the diffusion layer and overlapping the respective light sources in a vertical direction, wherein the first and second light-emitting elements may be spaced apart from each other in a first direction and overlap the respective light-shielding units in the vertical direction, the length of each of the light-shielding units in the first direction may be greater than the length thereof in a second direction orthogonal to the first direction, each of the light-shielding units may include a first light-shielding pattern overlapping the respective light source in the vertical direction and a second light-shielding pattern disposed on an outer periphery of the first light-shielding pattern, the first light-shielding pattern may have a first thickness, and the second light-shielding pattern may have a second thickness smaller than the first thickness.

Description

lighting device

[0001] An embodiment of the invention relates to a lighting device.

[0002] Lighting applications include not only vehicle lighting but also backlighting for displays and signage. Light-emitting diodes (LEDs), for example, offer advantages over conventional light sources like fluorescent and incandescent lamps, including low power consumption, a near-permanent lifespan, fast response times, safety, and environmental friendliness. These LEDs are used in various lighting devices, including display devices, indoor lighting, and outdoor lighting.

[0003] Lamps using light-emitting diodes (LEDs) as vehicle light sources are being proposed. Compared to incandescent lamps, LEDs offer the advantage of lower power consumption. However, because the light emitted from LEDs has a small angle of incidence, there is a need to increase the light-emitting area of ​​LED lamps when using them in vehicle lamps.

[0004] The above light-emitting diodes can increase the design freedom of the lamp due to their small size, and are also economical due to their semi-permanent lifespan.

[0005] An embodiment of the invention provides a lighting device having a light-shielding portion having a light-shielding pattern, the light-shielding portion being positioned over adjacent light sources arranged within a resin layer. An embodiment of the invention provides a lighting device having a light-shielding portion having a light-shielding pattern printed in two layers over the resin layer, and positioned under a diffusion layer. An embodiment of the invention provides a lighting device having a light-shielding portion positioned over light sources that emit light of different wavelengths using a single light-shielding portion. An embodiment of the invention improves the reliability of lighting modules and lighting devices, and allows such modules or devices to be applied to electronic devices.

[0006] A lighting device according to an embodiment of the invention comprises: a substrate; a plurality of light sources disposed on the substrate, each light source having first and second adjacent light-emitting elements; a resin layer covering the plurality of light sources; a diffusion layer disposed on the resin layer; and a plurality of light-shielding portions disposed between the resin layer and the diffusion layer and vertically overlapping each of the plurality of light sources, wherein the first and second light-emitting elements are spaced apart in a first direction and overlap each of the plurality of light-shielding portions in the vertical direction, and a length of each of the light-shielding portions in the first direction is longer than a length in a second direction orthogonal to the first direction, and each of the light-shielding portions includes a first light-shielding pattern vertically overlapping each of the light sources, and a second light-shielding pattern disposed on an outer periphery of the first light-shielding pattern, wherein the second light-shielding pattern has a first thickness, and the second light-shielding pattern may have a second thickness thinner than the first thickness.

[0007] According to an embodiment of the invention, the first light-emitting element may emit white light, and the second light-emitting element may emit amber light. The first light-emitting element may emit red light, and the second light-emitting element may emit amber light. The distance between the first and second light-emitting elements of each of the light sources may be 2 mm or less.

[0008] According to an embodiment of the invention, the lengths of the first and second directions of each of the light sources are a and d, and the condition: 2 < a / d < 3 can be satisfied. The maximum separation distances of the first shading pattern passing through the center of the light-shielding portion in the first and second directions are b and e, and the condition: 1 < b / e < 1.5 can be satisfied. The maximum separation distances of the second shading pattern passing through the center of the light-shielding portion in the first and second directions are c and f, and the condition: 1 < c / f < 1.5 can be satisfied. The light-shielding portion includes a straight section extending in the first direction on both sides of the second direction, and the maximum length of the straight section is g, and the condition: 1 ≤ a / g < 2 can be satisfied. The maximum lengths of the light-shielding portion passing through the center of the light-shielding portion in the first and second directions are h and f, and the condition: 1 < h / f < 1.5 can be satisfied.

[0009] According to an embodiment of the invention, the light-shielding layer includes an adhesive layer disposed between the diffusion layer and the resin layer, the light-shielding portion is disposed under the diffusion layer, and the adhesive layer may be disposed around the light-shielding portion. The light-shielding portion includes an air gap between the second light-shielding pattern and the adhesive layer, and the air gap may be disposed to be 20% or less of an area of ​​an imaginary elliptical shape formed along a boundary line between the adhesive layer and the light-guide portion. The air gap is disposed between the second light-shielding pattern and the adhesive layer, and the first thickness may be twice the second thickness.

[0010] According to an embodiment of the invention, a lighting module having light sources emitting different colors within a lighting device can be provided, thereby providing a lamp with various functions. In addition, by shielding at least two colors of light sources with a single shading part, the uniformity of the surface light source can be improved. According to an embodiment of the invention, a shading part having an elliptical shape with a long length in a direction corresponding to the arrangement direction of adjacent light sources can be arranged, thereby improving the light shielding effect. According to an embodiment of the invention, a lighting device having uniform light uniformity and a lighting image of various colors can be provided, and the reliability of an electronic device having the same can be improved.

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

[0012] Fig. 2 is a partially enlarged view of the lighting device of Fig. 1.

[0013] Figures 3 (a) and (b) are drawings explaining the manufacturing process of the light-shielding part of the lighting device of Figure 2.

[0014] Fig. 4 is a plan view showing the pattern of the shading part and the arrangement of light sources in Fig. 1.

[0015] Figure 5 is a partially enlarged view of Figure 4.

[0016] Figures 6 (a) and (b) are drawings showing the light uniformity for the first and second light sources when the light sources of the lighting device of Figure 1 are at the first interval.

[0017] Fig. 7 is a drawing showing an example of a plan view of a vehicle having a lighting device of the invention.

[0018] Fig. 8 is an example of a taillight of a vehicle to which the lighting device of Fig. 7 is applied.

[0019] Hereinafter, preferred embodiments of the invention will be described in detail with reference to the attached drawings.

[0020] The technical idea of ​​the present invention is not limited to some of the embodiments described, but can be implemented in various different forms, and within the scope of the technical idea of ​​the present invention, one or more of the components between the embodiments can be selectively combined or substituted and used. In addition, the terms (including technical and scientific terms) used in the embodiments of the present invention can be interpreted as having a meaning that can be generally understood by a person of ordinary skill in the technical field to which the present invention belongs, unless explicitly specifically defined and described, and the meaning of commonly used terms, such as terms defined in a dictionary, can be interpreted in consideration of the contextual meaning of the related technology. In addition, the terminology used in the embodiments of the present invention is for the purpose of describing the embodiments and is not intended to limit the present invention. In this specification, the singular may also include the plural unless specifically stated in the phrase, and when it is described as "A and (or at least one (or more than one) of B, C", it may include one or more of all combinations that can be combined with A, B, and C. In addition, when describing components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only intended to distinguish the components from other components, and the nature, order, or sequence of the components are not determined by the terms. In addition, when it is described that a component is 'connected', 'coupled', or 'connected' to another component, the component may include not only cases where the component is directly connected, coupled, or connected to the other component, but also cases where the component is 'connected', 'coupled', or 'connected' by another component between the component and the other component.Additionally, when it is described as being formed or arranged "above or below" each component, "above" or "below" includes not only cases where the two components are in direct contact with each other, but also cases where one or more other components are formed or arranged between the two components. Furthermore, when it is expressed as "above" or "below", it can include the meaning of a downward direction as well as an upward direction based on one component.

[0021] The lighting device according to the present invention can be applied to various lamp devices requiring lighting, such as vehicle lamps, household lighting devices, or industrial lighting devices. For example, when applied to vehicle lamps, it can be applied to headlamps, side lights, turn signals, side mirror lights, fog lights, tail lights, reverse lights, brake lights, daytime running lights, vehicle interior lights, door scars, rear combination lamps, backup lamps, etc. The lighting device of the present invention can also be applied to indoor and outdoor advertising devices, display devices, and various types of electric vehicles, and in addition, it can be applied to all lighting-related fields or advertising-related fields that are currently developed and commercialized or can be implemented with future technological advancements.

[0022]

[0023] FIG. 1 is an example of a side cross-sectional view of a lighting device according to an embodiment of the invention, FIG. 2 is a partial enlarged view of the lighting device of FIG. 1, FIG. 3 is a plan view showing the pattern of a light-shielding portion and the arrangement of light sources of FIG. 1, and FIG. 4 is a partial enlarged view of FIG. 3.

[0024] Referring to FIGS. 1 to 4, a lighting device (400) according to an embodiment of the invention may include a substrate (401), a light source (100), a resin layer (420), a diffusion layer (430), and a light-shielding portion (440). The lighting device (400) may include a reflective layer (410) between the substrate (101) and the resin layer (420). The lighting device (400) may include an adhesive layer (425) between the resin layer (420) and the diffusion layer (430).

[0025] The substrate (401) may include a printed circuit board (PCB). The substrate (401) may include, for example, at least one of a resin-based printed circuit board (PCB), a metal core PCB, a flexible PCB, a ceramic PCB, or an FR-4 substrate. When the substrate (401) is arranged as a metal core PCB with a metal layer disposed on the bottom, the heat dissipation efficiency of the light source (100) may be improved. The substrate (401) may be provided with an opaque material. As another example, the substrate (401) may include a light-transmitting material through which light is transmitted through the upper and lower surfaces. The light-transmitting material may include at least one of polyethylene terephthalate (PET), polystyrene (PS), and polyimide (PI).

[0026] The substrate (401) may be electrically connected to the light sources (100). The substrate (401) includes a wiring layer (not shown) on the upper portion, and the wiring layer may be electrically connected to the light sources (100). The light sources (100) may be arranged in multiple numbers and may be devices or packages having light-emitting diodes (LEDs). When multiple light sources (100) are arranged on the substrate (401), the multiple light sources (100) may be connected in series, in parallel, or in series-parallel fashion by the wiring layer. The substrate (401) may include, for example, an insulating layer or a reflective material layer protecting the circuit pattern on the upper portion. The substrate (401) may function as a base member or a support member arranged below the light sources (100) and the resin layer (420). Here, the light sources (100) may be driven by color or driven simultaneously.

[0027] The substrate (401) and the resin layer (420) may have a length in the first direction (X) greater than a width in the second direction. The upper or lower surface of the substrate (401) may be flat or curved. The thickness of the substrate (401) may be a height in a direction perpendicular to the upper surface of the substrate (401) or in a third direction (Z). Here, the first direction (X) is a longitudinal direction of the lighting device (400), and the second direction (Y) may be a width direction orthogonal to the first direction (X). The third direction (Z) may be a direction orthogonal to the first and second directions (X, Y). The lighting device (400) having the substrate (401) and the resin layer (420) may be provided in a straight or curved bar shape in a long direction.

[0028]

[0029] The light source (100) is disposed on the substrate (401) and emits light toward the inside of the resin layer (420) or at least in a third direction (Z). The light source (100) emits light with the highest intensity in the third direction (Z). The light source (100) can be bonded to a circuit pattern disposed on the substrate (401) using a bonding member (not shown), and the bonding member is made of a conductive material and may be a solder material or a metal material.

[0030] The light source (100) may be arranged in a plurality of unit groups having two or more light-emitting elements (101, 102). The unit groups may include, for example, two to four light-emitting elements, and the embodiment will be described using two light-emitting elements as an example. The interval between adjacent unit groups may be greater than the thickness of the resin layer (420) or the thickness of the lighting device (400). Each of the light sources (100) may include a first light-emitting element (101) and a second light-emitting element (102) that are arranged adjacently. The adjacent first and second light-emitting elements (101, 102) may be unit groups.

[0031] The light emitting elements (101, 102) of the light source (100) can emit at least one of blue, red, green, ultraviolet (UV), white, amber, and infrared. The light emitting elements (101, 102) of the light source (100) can include an LED chip that emits at least one of white, blue, red, green, amber, and infrared. The light emitting elements (101, 102) of the light source (100) can emit different colors or different peak wavelengths. Each of the light emitting elements (101, 102) can be a flip-type package in which a bottom portion is electrically connected to the substrate (401). The side surfaces of the first and second light emitting elements (101, 102) can face each other. As another example, the corner portions of the first and second light emitting elements (101, 102) can correspond to each other. That is, the light emitting elements of a unit group can be arranged in the first direction (X), the second direction (Y), or another direction.

[0032]

[0033] The plurality of light-shielding portions (440) may be disposed above each of the plurality of light sources (100). Each of the plurality of light-shielding portions (440) may be disposed on the resin layer (420). The spacing between adjacent light sources (100) may be greater than the spacing between adjacent light-shielding portions (440). Each of the light sources (100) may overlap each of the light-shielding portions (440) in a third direction (Z). Each of the plurality of light-shielding portions (440) may overlap each of the light-emitting elements (101, 102) of the unit group in a third direction (Z). The first light-emitting element (101) emits light of a first color, and the second light-emitting element (102) emits light of a second color different from the first color. The light of the first color may be white light, and the light of the second color may be amber light. As another example, the light of the first color may be red light, and the light of the second color may be white light. The first and second light-emitting elements (101, 102) may be driven individually or simultaneously.

[0034] When the first light-emitting element (101) emits white light, the first light-emitting element (101) may include a blue LED chip and a yellow phosphor layer disposed on the blue LED chip. When the second light-emitting element (102) emits amber light, the second light-emitting element (102) may include an amber LED chip. When the first light-emitting element (101) emits red light, the first light-emitting element (101) may be a red LED chip, or may include a blue LED chip and a red phosphor layer disposed on the blue LED chip.

[0035] The spacing between adjacent first and second light-emitting elements (101, 102) may be 5 mm or less or 2 mm or less, for example, in the range of 0.5 mm to 2 mm or 0.3 mm to 0.7 mm. If the spacing between the first and second light-emitting elements (101, 102) is greater than the above range, the size of the light-shielding portion (440) may increase or the light-shielding effect may decrease, and if it is smaller than the above range, light interference or heat dissipation efficiency may decrease. The spacing between adjacent light sources (100) in the first direction (X) may be greater than the spacing between adjacent first and second light-emitting elements (101, 102), for example, may be 10 times or more greater.

[0036]

[0037] The above reflective layer (410) may be a layer separately attached to the upper portion of the substrate (401). The reflective layer (410) may be disposed between the substrate (401) and the resin layer (420). The reflective layer (410) may be adhered to the upper surface of the substrate (401). The reflective layer (410) may have a thickness thinner than the thickness of the light source (100). The reflective layer (410) may be provided as a film having a single-layer or multi-layer structure. The reflective layer (410) may include a metallic material or a non-metallic material. The metallic material may include a metal such as aluminum, silver, or gold. The non-metallic material may include a plastic material or a resin material. The resin material may include a reflective material, for example, a metal oxide such as TiO2, Al2O3, or SiO2, added to silicone or epoxy. The above-mentioned reflective layer (410) can be implemented as a single layer or multiple layers, and the light reflection efficiency can be improved by this layer structure. The reflective layer (410) can increase the amount of light and improve the light distribution by reflecting the incident light.

[0038]

[0039] The resin layer (420) may be in contact with the reflective layer (410). The resin layer (420) may be in contact with the entire upper surface or a portion of the upper surface of the reflective layer (410). The lower surface area of ​​the resin layer (420) may be equal to or larger than the upper surface area of ​​the reflective layer (410). The resin layer (420) may be formed of a transparent material and may guide and diffuse incident light. The resin layer (420) may be a resin material such as silicone or epoxy, or may include a UV (Ultraviolet) curable resin material. Such a resin material can be used instead of a light guide plate, and has the effect of conveniently controlling the refractive index and thickness. The resin layer (420) uses the oligomer disclosed above as a main material, and by mixing IBOA, a diluting monomer, and GMA, hardness, heat resistance, and transmittance can be controlled, and adhesion and oxidation resistance can be suppressed. The above resin layer (420) can control curing and suppress discoloration by including a photoinitiator and a photostabilizer.

[0040] Since the resin layer (420) is provided as a layer that guides light with resin, the resin layer (420) can be provided with a thin thickness compared to a material such as glass and can be provided as a flexible plate. The resin layer (420) can emit point light emitted from the light source (100) in the form of a line light source or a surface light source. The resin layer (420) can contain impurities such as a diffusion agent (not shown) or a fluorescent substance (not shown), and can increase the amount of light or convert the wavelength. As another example, the resin layer (420) can contain a fluorescent substance (not shown) therein. Since the resin layer (420) is disposed on the light source (100), it can seal the light source (100) and protect the surface of the light source (100), and can reduce the loss of light emitted from the light source (100). The light source (100) may be embedded in the lower portion of the resin layer (420). The resin layer (420) may be in contact with the surface of the light source (100). The lower portion of the light-emitting element (101, 102) may protrude from within the resin layer (420) to the reflective layer (410) and be electrically connected to the substrate (410).

[0041] The thickness of the resin layer (420) may be 1.8 mm or more, for example, in the range of 1.8 mm to 2.5 mm. If the thickness of the resin layer (420) is thicker than the above range, the brightness may be reduced, and it may be difficult to provide it as a flexible module due to the increase in module thickness. If the thickness of the resin layer (420) is smaller than the above range, it is difficult to provide surface light with uniform brightness. The resin layer (420) may be provided in a size that covers a plurality of light sources (100), and may emit light emitted through the plurality of light sources (100) through the upper surface. Here, the module may include a configuration from the substrate (401) to the diffusion layer (430).

[0042]

[0043] The above diffusion layer (430) may be positioned on top of the resin layer (420) to ensure uniform light distribution. The diffusion layer (430) may include a single layer or multiple layers and may include a diffusion material. The diffusion material may include at least one of polyester (PET), poly methyl methacrylate (PMMA), or poly carbonate (PC).

[0044] The diffusion layer (430) may include at least one or two or more of a diffuser, a fluorescent substance, and ink particles. The fluorescent substance may include, for example, at least one of a red fluorescent substance, an amber fluorescent substance, a yellow fluorescent substance, a green fluorescent substance, or a white fluorescent substance. The ink particles may include at least one of a metallic ink, a UV ink, or a curable ink. The size of the ink particles may be smaller than the size of the fluorescent substance. The surface color of the ink particles may be any one of green, red, yellow, and blue. The ink type may be selectively applied from among PVC (Poly vinyl chloride) ink, PC (Polycarbonate) ink, ABS (acrylonitrile butadiene styrene copolymer) ink, UV resin ink, epoxy ink, silicone ink, PP (polypropylene) ink, water-based ink, plastic ink, PMMA (poly methyl methacrylate) ink, and PS (Polystyrene) ink. The ink particles may include at least one of a metallic ink, a UV ink, or a curable ink.

[0045]

[0046] The plurality of light-shielding portions (440) are arranged between the diffusion layer (430) and the resin layer (420), and can block or reflect light incident from the upper portion of each of the light sources (100) and block hot spots. Each of the plurality of light-shielding portions (440) can overlap each of the light sources (100) in the vertical direction (Z). The light-shielding portions (440) can be formed as a single layer or multiple layers, and can include a reflector. The area of ​​the light-shielding portions (440) can be arranged to be larger than the area of ​​the region connecting the outer lines of the first and second light-emitting elements (101, 102), and for example, can be 1.5 times or more the area occupied by the region where each of the light sources (100) is arranged, i.e., the region of the unit group. Accordingly, the light-shielding member (440) can suppress hot spots caused by light emitted from the light-emitting elements (101, 102) of the unit group.

[0047] Each of the plurality of light-shielding portions (440) may be disposed on each of the light sources (100) or on each of the first and second light-emitting elements (101, 102) of the unit group. Each of the plurality of light-shielding portions (440) may have a thickness that is thicker in an area overlapping each of the light sources (100) in the third direction (Z) than in an area disposed at the outer edge. Each of the plurality of light-shielding portions (440) may have a layer of an area overlapping each of the light sources (100) in the third direction (Z) and a layer of an area disposed at the outer edge as a single layer.

[0048] Each of the plurality of light-shielding portions (440) may include a first light-shielding pattern (441) and a second light-shielding pattern (442). The first light-shielding pattern (441) includes an inner pattern (LB1) and an outer pattern (LB2). The inner pattern (LB1) is provided as an integral pattern that is connected to each other, and the outer pattern (LB2) may include a dot-shaped pattern arranged along the outer perimeter of the inner pattern (LB1). The dot-shaped pattern may include a circle or a polygon, and may have the same size or some patterns may have different sizes. The second light-shielding pattern (442) may include a single pattern or multiple dot patterns arranged in a horizontal direction on the outer side of the outer pattern (LB2) of the first light-shielding pattern (441). The above second shading pattern (442) may include a plurality of dot patterns that are connected to each other and a plurality of dot patterns that are separated from each other, and may include a dot shape in a circular or polygonal shape.

[0049]

[0050] The above-described light-shielding portion (440) may be spaced apart from the upper surface of the resin layer (420). The adhesive layer (425) may be further disposed between the light-shielding portion (440) and the resin layer (420). The adhesive layer (425) may fix the diffusion layer (430) onto the resin layer (420). The adhesive layer (425) may bond between the resin layer (420) and the diffusion layer (430). The light-shielding portion (425) may include a plurality of air gaps (R1). Each of the plurality of air gaps (R1) may be disposed between the adhesive layer (425) and a periphery of each of the light-shielding portions (440). Each of the plurality of air gaps (R1) may extend below the second light-shielding pattern (442) of each of the light-shielding portions (440). That is, a plurality of dot patterns of the second shading patterns (442) can overlap in a direction perpendicular to the air gap (R1), i.e., in the third direction (Z).

[0051] The above air gap (R1) is an inner empty space of a virtual ellipse connecting the outer points of the second shading patterns (442), and may be an area between the second shading pattern (442) and the adhesive layer (425). The elliptical area is a boundary area between the adhesive layer (425) and the patterns of the shading portion (440). The air gap (R1) may be 20% or less of the area of ​​the elliptical area, for example, in the range of 5% to 20% or 10% to 20%. When the area of ​​the air gap (R1) is larger than the above range, the improvement in the shading effect is minimal, and when it is smaller than the above range, it is difficult to form the adhesive layer (425). The length of the virtual ellipse in which the air gap (R1) is formed along the first direction (X) may be larger than the length in the second direction (Y). The first direction (X) is a direction of a straight line passing through the center of each of the light sources (100). The radius of curvature of the virtual ellipse forming the air gap (R1) on both sides of the first direction (X) may be 4 mm or less, for example, in the range of 2.5 mm to 4 mm or in the range of 2.5 mm to 3.5 mm. This radius of curvature may cover the upper area of ​​at least two light-emitting elements (101, 102) to prevent hot spots caused by light generated from the light-emitting elements (101, 102).

[0052]

[0053] The first shading pattern (441) and the second shading pattern (442) of the above-described shading portion (440) may have different thicknesses. The first shading pattern (441) may have a first thickness, and the second shading pattern (442) may have a second thickness that is thinner than the first thickness. The maximum thicknesses of the first and second shading patterns (441, 442) are based on the lower surface of the diffusion layer (430), and may be smaller than the thickness of the adhesive layer (425). The first thickness may be 0.1 times or less of the thickness of the resin layer (420), for example, in the range of 0.05 to 0.1 times. The first thickness may be 100 ㎛ or more, for example, in the range of 100 to 200 ㎛.

[0054] As shown in (a)(b) of FIG. 3, the shading portion (440) can be printed in two layers, for example, a layer (L1, L2) having a second thickness is printed over the entire area of ​​the first and second shading patterns (441, 442), and then an additional shading pattern is printed on the area of ​​the first shading pattern (441) to create the first thickness. The shading portion (440) is formed by printing a first shading layer (L1) having a first thickness on the lower surface of the diffusion layer (430), and then printing a second shading layer (L2) having the first thickness under the inner area of ​​the first shading layer (L1). Accordingly, the shading portion (440) is printed by stacking two layers (L1, L2) having the same thickness. Accordingly, the first shading pattern (441) of the shading portion (440) may be a region having the first thickness by printing the second thickness twice, and the second shading pattern (442) may be a region having the second thickness. These first and second shading layers (L1, L2) may be repeatedly formed using the same material and the same process, and the boundary between the two layers (L1, L2) may be provided as a layer of a single material without a separate boundary line. In addition, the first thickness of the first shading pattern (441) may be twice the second thickness. The first thickness may be 100 ㎛ or more, for example, in the range of 100 to 200 ㎛.

[0055] As shown in FIGS. 4 and 5, the length (h) of the light-shielding portion (440) in the first direction (X) may be greater than the length (f) in the second direction. The light-shielding portion (440) may be provided in a shape capable of covering the first and second light-emitting elements (101, 102) arranged in the first direction (X). The maximum lengths (h, f) of the light-shielding portion (440) in the first and second directions (X, Y) may satisfy the following ratios.

[0056] Condition 1: 1 < h / f < 1.5 or 1 < h / f < 1.3

[0057] The length (h) of the first direction (X) of the above-described light-shielding portion (440) may be 7 mm or more, for example, in the range of 7 mm to 13 mm or 8 mm to 12 mm. If the length (h) of the first direction (X) of the above-described light-shielding portion (440) is smaller than the above-described range, a hot spot may be generated by light generated from a light source (100) having a plurality of light-emitting elements (101, 102), and if it is larger than the above-described range, a dark spot may be generated.

[0058] The first shading pattern (441) may have the first thickness and be arranged in an inner region of the second shading pattern (442). The maximum separation distance (b) of the first shading pattern (441) in the first direction (X) may be 1.5 times or more, for example, 1.5 to 3 times or 2.2 to 2.8 times the length (a) of the light source (100) in the first direction. The maximum separation distance (c) of the second shading pattern (442) in the first direction (X) may be 2.5 to 3.5 times or 2.8 to 3.2 times the length (a) of the light source (100) in the first direction (X). The maximum separation distance (b) in the first direction (X) of the first shading pattern (441) may be provided as a length for controlling the hot spot of the light-emitting elements (101, 102) that may vary depending on the viewing angle of the lighting device (400). If it is smaller than the above range, it may be exposed to the hot spot depending on the viewing angle, and if it is larger than the above range, the dark area may become larger.

[0059] The second shading pattern (442) is positioned with a length of an area for blocking light that is not sufficiently covered on the outside of the first shading pattern (441), that is, a maximum separation distance (c), so that the image uniformity can be improved and the influence on dark areas can be reduced due to the thin second thickness.

[0060] The maximum separation distance (e) of the first shading pattern (441) in the second direction (Y) may be at least 4 times the second direction length (d) of the light source (100) or the length of the light emitting element (101, 102), for example, 4 to 6 times, or 4.5 to 6 times. The maximum separation distance (e) of the first shading pattern (441) in the second direction (Y) may be provided as a length for controlling a hot spot according to the viewing angle of the lighting device, and if it is smaller than the above range, a hot spot may be exposed, and if it is larger than the above range, a dark area may be generated. The separation distance (k) of the second shading pattern (442) in the second direction (Y) covers an area that is not sufficiently covered by the first shading pattern (441), can improve image uniformity, and can reduce the influence on the dark area due to a thin second thickness. Here, the ratio of the lengths (a, d) of the first and second directions (X, Y) of the light source (100), the ratio of the maximum separation distances (b, e) of the first shading pattern (441) passing through the center of the shading portion (440) in the first and second directions (X, Y), and the ratio of the separation distances (c, k) of the second shading pattern (442) passing through the center of the shading portion (440) in the first and second directions (X, Y) can satisfy the following conditions. The maximum separation distances of the first and second shading patterns (441, 442) or the maximum length of the shading portion (440) are the maximum separation distances in the first and second directions passing through or orthogonal to the center of the shading portion (440).

[0061] Condition 1: 2 < a / d < 3 or 2.3 < a / d < 2.7

[0062] Condition 2: 1 < b / e < 1.5 or 1 < b / e < 1.3

[0063] Condition 3: 1 < c / k < 1.5 or 1 < a / d < 1.3

[0064] The above-described light-shielding portion (440) may be placed on an area satisfying at least one or all of conditions 1 to 3. The elliptical shape of the light-shielding portion (440) may include straight sections on both sides of the second direction (Y). The maximum length (g) of the straight section may be less than or equal to the length (a) of the first direction (X) of the light source (100), and may satisfy the following condition 4.

[0065] Condition 4: 1 ≤ a / g < 2 or 1.5 ≤ a / g < 2

[0066]

[0067] Figures 6 (a) and (b) are drawings showing the light uniformity according to the individual driving of the first and second light-emitting elements (101, 102) of the light source (100). The light uniformity of Figure 6 (a) is the light uniformity in the case where the second light-emitting element (102) of the light source (100) in Figure 4 is turned on, the first light-emitting element (101) is in the off state, and amber light is emitted, and Figure 6 (b) is the light uniformity in the case where the first light-emitting element (101) of the light source (100) in Figure 4 is turned on, the second light-emitting element (102) is in the off state, and white light is emitted. The light uniformity measured for the amber light and white light is as shown in Table 1, and the distance between the first and second light-emitting elements (101, 102) is 0.5 mm.

[0068] Spacing between light emitting elements: 0.5mmMin (cd)Max (cd)Uniformity (Min / Max)Amber light208546900.44White light185850560.37

[0069]

[0070] Table 2 below shows the light uniformity measured for amber light and white light by the first and second light-emitting elements (101, 102), and is a case where the distance between the first and second light-emitting elements (101, 102) is 5 mm. Here, (A) of Fig. 6 is the light uniformity when the second light-emitting element (102) of the light source (100) of Fig. 4 is turned on, the first light-emitting element (101) is in the off state, and amber light is emitted, and (B) of Fig. 6 is the light uniformity when the first light-emitting element (101) of the light source (100) of Fig. 4 is turned on, and the second light-emitting element (102) is in the off state.

[0071] Spacing between light emitting elements: 5 mmMin (cd)Max (cd)Uniformity (Min / Max)Amber light200949670.4White light181851410.35

[0072] Table 3 is a comparative example, in which white light-emitting elements and amber light-emitting elements are separated and individually shaded. The gap between them is 10 mm.

[0073] Spacing between light emitting elements: 10mmMin (cd)Max (cd)Uniformity (Min / Max)Amber light280519000.0054White light273494780.0055

[0074] It can be seen that the light uniformity measured in Tables 1 and 2 is improved over the light uniformity measured in Table 3, and it can also be seen that the light uniformity in Table 1 is improved over that in Table 2. Accordingly, it can be seen that when adjacent light-emitting elements are arranged at a distance of 2 mm or less or 1 mm or less, the deterioration of the light uniformity is prevented even when covered by a single light-shielding portion.

[0075]

[0076] Fig. 7 is a plan view of a vehicle to which a lighting device according to an embodiment is applied, and Fig. 8 is a drawing showing an example of a taillight of the vehicle of Fig. 7.

[0077] Referring to FIGS. 7 and 8, a front lamp (850) in a mobile or vehicle (900) may include one or more lighting modules, and by individually controlling the driving timing of these lighting modules, it may provide not only the function of a conventional headlight, 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 a daytime running light, a high beam, a low beam, a fog light, or a turn signal.

[0078] In a vehicle (900), a taillight (800) may be arranged with a plurality of lamp units (810, 812, 814, 816) supported by a housing (801). For example, the lamp units (810, 812, 814, 816) may include a first lamp unit (810) arranged on the outside, a second lamp unit (814) arranged around the inner periphery of the first lamp unit (810), and third and fourth lamp units (814, 816) arranged on the inside of the second lamp unit (814), respectively. The first to fourth lamp units (810, 812, 814, 816) may selectively apply the lighting device disclosed in the embodiment, and a red lens cover or a white lens cover may be arranged on the outside of the lighting device for the lighting characteristics of the lamp units (810, 812, 814, 816). The lighting device disclosed in the embodiment applied to the above lamp unit (810, 812, 814, 816) can emit light with a uniform distribution.

[0079] The first and second lamp units (810, 812) may be provided in at least one of a curved shape, a straight shape, an angular shape, an inclined shape, or a planar shape, or a mixed structure thereof. The first and second lamp units (810, 812) may be arranged one by one or in a plurality in each tail light. The first lamp unit (810) may be provided as a tail light, the second lamp unit (812) may be provided as a brake light, the third lamp unit (814) may be provided as a reverse light, and the fourth lamp unit (816) may be provided as a turn signal lamp. The structure and position of these lighting lamps may be changed.

[0080] The features, structures, effects, etc. described in the embodiments above are included in at least one embodiment of the present invention, and are not necessarily limited to just one embodiment. Furthermore, the features, structures, effects, etc. exemplified in each embodiment can be combined or modified in other embodiments by those skilled in the art to which the embodiments pertain. Therefore, the contents related to such combinations and modifications should be construed as falling within the scope of the present invention.

[0081] In addition, although the above description focuses on examples, these are merely examples and do not limit the present invention. Those skilled in the art to which the present invention pertains will appreciate that various modifications and applications not exemplified above are possible without departing from the essential characteristics of the present invention. For example, each component specifically shown in the examples can be modified and implemented. In addition, differences related to such modifications and applications should be interpreted as being included within the scope of the present invention defined in the appended claims.

Claims

1. Substrate; A plurality of light sources each having first and second adjacent light-emitting elements, each of which is arranged on the substrate; A resin layer covering the plurality of light sources; a diffusion layer disposed on the resin layer; and It is disposed between the resin layer and the diffusion layer, and includes a plurality of light-shielding portions that overlap each of the plurality of light sources in a vertical direction. The first and second light-emitting elements are spaced apart in the first direction and overlap each of the plurality of light-blocking parts in the vertical direction, The length of each of the above shading parts in the first direction is longer than the length in the second direction perpendicular to the first direction, Each of the above shading portions includes a first shading pattern vertically overlapping with each of the light sources, and a second shading pattern arranged on the outer periphery of the first shading pattern, A lighting device, wherein the first shading pattern has a first thickness, and the second shading pattern has a second thickness that is thinner than the first thickness.

2. In paragraph 1, The above first light-emitting element emits white light, A lighting device wherein the second light-emitting element emits amber.

3. In paragraph 1, The above first light-emitting element emits red light, A lighting device wherein the second light-emitting element emits amber.

4. In paragraph 1, A lighting device, wherein the spacing between the first and second light-emitting elements of each of the above light sources is 2 mm or less.

5. In any one of paragraphs 1 to 4, The lengths of the first and second directions of each of the above light sources are a and d, Condition: 2 < a / d < 3 A lighting device that satisfies .

6. In paragraph 5, The maximum separation distances in the first and second directions of the first shading pattern passing through the center of the shading portion are b and e, Condition: 1 < b / e < 1.5 A lighting device that satisfies .

7. In paragraph 5, The maximum separation distance in the first and second directions of the second shading pattern passing through the center of the shading portion is c and f, Condition: 1 < c / f < 1.5 A lighting device that satisfies .

8. In paragraph 5, The above-mentioned shading portion includes a straight section extending in the first direction on both sides of the second direction, The maximum length of the above straight section is g, Condition: 1 ≤ a / g < 2 A lighting device that satisfies .

9. In paragraph 5, The maximum lengths of the first and second directions of the above-mentioned shading part passing through the center of the above-mentioned shading part are h and f, Condition: 1 < h / f < 1.5 A lighting device that satisfies .

10. In paragraph 9, It includes an adhesive layer disposed between the diffusion layer and the resin layer, The above-mentioned shading member is positioned below the above-mentioned diffusion layer, A lighting device, wherein the adhesive layer is arranged around the periphery of the light-shielding portion.

11. In paragraph 10, The above-mentioned shading portion includes an air gap between the second shading pattern and the adhesive layer, A lighting device wherein the air gap is arranged to be 20% or less of the area of ​​a virtual elliptical shape formed along the boundary line between the adhesive layer and the light guide portion.

12. In paragraph 10, The above air gap is disposed between the second shading pattern and the adhesive layer, A lighting device wherein the first thickness is twice the second thickness.

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