Lighting device and display lamp comprising same

Abstract

The present invention relates to a lighting device capable of providing pixel lighting, and a display lamp comprising same. The lighting device according to an embodiment comprises: a substrate; a light source unit disposed on the substrate; a partition wall disposed at the circumference of the light source unit; and an optical member disposed on the upper part of the light source unit, wherein the optical member has an optical characteristic change structure for uniformly diffusing light from the light source unit, and the optical characteristic change structure enables light transmission characteristics to be variably adjusted according to a distance from the light source unit. According to the embodiment, the optical member for variably adjusting light transmission characteristics according to the distance from the light source unit is disposed to simultaneously perform a diffuser function and a pattern mask function, and thus pixel lighting having high light uniformity and luminance can be provided, and assemblability and cost competitiveness can be increased by minimizing manufacturing and assembly processes.

Description

Lighting devices and indicator lamps including them

[0001] An embodiment relates to a lighting device capable of providing pixel lighting and a display lamp including the same.

[0002] Typical lighting applications include not only automotive lighting but also lights for displays and signage.

[0003] Semiconductor light-emitting devices, such as light-emitting diodes (LEDs), offer advantages over conventional light sources like fluorescent lamps and incandescent lamps, including low power consumption, a semi-permanent lifespan, fast response speed, safety, and environmental friendliness. These light-emitting diodes are applied to various lighting devices, such as display devices, indoor lights, and outdoor lights.

[0004] Recently, lamps employing light-emitting diodes have been proposed as automotive lighting.

[0005] Here, light-emitting diodes are advantageous in that they consume less power compared to incandescent bulbs, allow for greater design freedom due to their small size, and are economical due to their semi-permanent lifespan.

[0006] However, lighting devices using such light-emitting diodes faced a problem of reduced cost competitiveness due to the high complexity and difficulty of the manufacturing process.

[0007] Therefore, in the future, it is necessary to develop lighting devices that can enhance assemblability and cost competitiveness by minimizing manufacturing and assembly processes.

[0008] An embodiment of the invention can provide a lighting device that simultaneously performs a diffuser function and a pattern mask function by arranging an optical member having a thickness greater in a region closer to the light source than in a region farther from the light source.

[0009] An embodiment of the invention can provide a lighting device that simultaneously performs a diffuser function and a pattern mask function by arranging an optical member in which the density of through-hole patterns in an area close to the light source is lower than the density of through-hole patterns in an area far from the light source.

[0010] A lighting device according to an embodiment of the invention comprises a substrate, a light source unit disposed on the substrate, a partition unit disposed around the light source unit, and an optical member disposed above the light source unit, wherein the optical member has an optical characteristic changing structure for uniformly diffusing light from the light source unit, and the optical characteristic changing structure can differentially adjust light transmission characteristics according to the distance from the light source unit.

[0011] According to an embodiment of the invention, the optical characteristic change structure may include a thickness change structure in which a first thickness in a region close to the light source is thicker than a second thickness in a region far from the light source.

[0012] According to an embodiment of the invention, the optical member includes a first surface facing the direction in which the light source is positioned and a second surface facing the opposite direction in which the light source is positioned, and the first surface of the optical member includes a combination of at least two of a curved surface, an inclined surface, and a flat surface, and the second surface of the optical member may include a flat surface.

[0013] According to an embodiment of the invention, the first surface of the optical member has a curved surface formed in the area facing the light source part and the partition wall, and the curved surface may have any one of a convex curved surface shape, a concave curved surface shape, and a composite curved surface shape.

[0014] According to an embodiment of the invention, the first surface of the optical member may have a first flat surface formed in a central area facing the upper surface of the light source part, a curved or inclined surface formed in an intermediate area facing between the light source part and the partition wall, and a second flat surface formed in an outer area facing the partition wall.

[0015] According to an embodiment of the invention, the optical characteristic change structure may include a pattern in which a plurality of through holes are formed, and may include a pattern density change structure in which the pattern density in an area close to the light source is lower than the pattern density in an area far from the light source.

[0016] According to an embodiment of the invention, the optical member comprises a pattern area where the pattern is formed and a non-pattern area surrounding the pattern area, and the pattern area may include a first area that overlaps perpendicularly to the light source, a second area surrounding the first area, and a third area surrounding the second area.

[0017] According to an embodiment of the invention, the through hole comprises a plurality of first through holes formed in the first area, a plurality of second through holes formed in the second area, and a plurality of third through holes formed in the third area, wherein the number of first through holes per unit area is less than the number of second through holes per unit area, and the number of second through holes per unit area may be less than the number of third through holes per unit area.

[0018] According to an embodiment of the invention, the optical property change structure may simultaneously include a thickness change structure and a pattern density change structure.

[0019] A display lamp comprising at least one lighting device according to an embodiment of the invention includes at least one lighting device that provides uniform light by arranging an optical member above a light source part, and a cover lens that covers said lighting device. The lighting device includes a substrate, a light source part disposed on said substrate, a partition wall disposed around said light source part, and an optical member disposed above said light source part. The optical member has an optical characteristic changing structure for uniformly diffusing light from said light source part, and said optical characteristic changing structure may differentially adjust light transmission characteristics according to distance from said light source part.

[0020] The lighting device according to the embodiment can provide pixel lighting with high light uniformity and brightness by arranging an optical member having a thickness greater in the region closer to the light source than in the region farther from the light source to simultaneously perform diffuser and pattern mask functions, and can improve assembly and cost competitiveness by minimizing manufacturing and assembly processes.

[0021] The lighting device according to the embodiment can provide pixel lighting with high light uniformity and brightness by simultaneously performing diffuser and pattern mask functions by arranging an optical member in which the density of through-hole patterns in an area close to the light source is lower than the density of through-hole patterns in an area far from the light source, and can improve assembly and cost competitiveness by minimizing manufacturing and assembly processes.

[0022] FIGS. 1 to 3 are exemplary drawings showing a lighting device according to one embodiment.

[0023] FIGS. 4 to 6 are exemplary drawings showing a lighting device according to another embodiment.

[0024] FIGS. 7 to 9 are exemplary drawings showing a lighting device according to another embodiment.

[0025] FIGS. 10 to 12 are exemplary drawings showing a lighting device according to another embodiment.

[0026] FIG. 13 is an illustrative diagram showing a lighting device according to another embodiment.

[0027] FIG. 14 is a plan view of a vehicle equipped with a lighting device according to an embodiment.

[0028] FIG. 15 is a drawing showing an example of the taillights and indicator lamps of the vehicle of FIG. 14.

[0029] FIG. 16 is an example of a symbol or character of an indicator lamp displayed by the lighting device of FIG. 15.

[0030] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0031] However, the technical concept of the present invention is not limited to the described embodiments but can be implemented in various different forms, and within the scope of the technical concept of the present invention, one or more of the components among the embodiments may be selectively combined or substituted. Furthermore, terms used in the embodiments of the present invention (including technical and scientific terms) may be interpreted in a meaning generally understood by those skilled in the art to which the present invention pertains, unless explicitly and specifically defined otherwise; and terms commonly used, such as those defined in advance, may be interpreted by considering their meaning in the context of the relevant technology. Additionally, the terms used in the embodiments of the present invention are intended to describe the embodiments and are not intended to limit the present invention.

[0032] In this specification, the singular form may include the plural form unless specifically stated otherwise in the text, and when described as “at least one of A and B and C (or more than one),” it may include one or more of all combinations that can be formed from A, B, and C. Furthermore, in describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc., may be used. These terms are intended merely to distinguish the component from other components and are not determined by the essence, order, or sequence of the component. Also, when it is stated that a component is 'connected,' 'combined,' or 'connected' to another component, this may include not only cases where the component is directly connected, combined, or connected to the other component, but also cases where it is 'connected,' 'combined,' or 'connected' due to another component located between the component and the other component.

[0033] Furthermore, when described as being formed or placed "above or below" each component, "above" or "below" includes not only cases where two components are in direct contact with each other, but also cases where one or more other components are formed or placed between the two components. Additionally, when expressed as "above or below," it may include the meaning of a downward direction as well as an upward direction relative to a single component.

[0034] 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 the lighting device is applied to a vehicle lamp, it can be applied to headlamps, parking lights, side mirror lights, fog lights, tail lamps, brake lights, daytime running lights, vehicle interior lighting, 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. In addition, it can be applied to all lighting-related fields or advertising-related fields that are currently developed and commercialized or that can be implemented through future technological advancements.

[0035] FIGS. 1 to 3 are exemplary drawings showing a lighting device according to one embodiment. FIG. 1 is a perspective view of a lighting device according to one embodiment, FIG. 2 is a cross-sectional perspective view of FIG. 1, and FIG. 3 is a side cross-sectional view of FIG. 1.

[0036] As illustrated in FIGS. 1 to 3, the lighting device (1000) may include a substrate (100), a light source unit (120) disposed on the substrate, a partition (300) disposed around the light source unit (120), and an optical member (500) disposed on the upper part of the light source unit (120).

[0037] The substrate (100) 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. Here, if the substrate (100) is a flexible PCB, the lighting device (1000) may have flexible characteristics.

[0038] Additionally, the substrate (100) has one or more coupling holes, and the lighting device (1000) can be fastened to a bracket (not shown) through the coupling holes using a fastening means (not shown).

[0039] And, the substrate (100) can be electrically connected to at least one light source unit (120).

[0040] The substrate (100) includes a wiring layer on its upper surface, and the wiring layer can be electrically connected to at least one light source (120).

[0041] The substrate (100) may be a single-layer substrate having a single wiring layer or a multilayer substrate having multiple wiring layers. If the substrate (100) is a single-layer substrate, the substrate (100) may have a protective layer on the upper surface of the wiring layer, an insulating layer on the lower surface of the wiring layer, and a metal layer disposed below the insulating layer. If the substrate (100) is a multilayer substrate, the substrate (100) may have a protective layer on the upper surface of the upper wiring layer, an insulating layer on the lower surface of the upper wiring layer, and a layer for lower wiring disposed below the insulating layer, and the layer for lower wiring may be connected to the upper wiring layer through vias. Here, the protective layer of the substrate (100) is a layer for protecting the wiring layer and may be formed of a solder resistor material or a reflective material, and the color of the reflective material may be provided as white.

[0042] Next, the light source (120) emits the highest light in the third direction (Z) or the optical axis direction, where the third direction (Z) is a direction orthogonal to the first and second directions (X,Y) and may be a direction from the substrate (100) toward the optical member (500).

[0043] The light source unit (120) is mounted on the substrate (100) and can be provided as an LED chip or a package covering the surface of the LED chip with resin.

[0044] The light source unit (120) is a light-emitting device having a light-emitting diode chip (LED Chip), and may include various forms such as a package in which the light-emitting diode chip is packaged, a flip-chip, or a CSP (Chip scale package). Here, the light-emitting diode chip may emit at least one of blue, red, green, ultraviolet (UV), or infrared light, and the light source unit (120) may emit at least one of white, blue, red, green, or infrared light, and may emit light in a colored light such as white, blue, or green.

[0045] The thickness (T0) or height of the light source part (120) may be about 0.4 mm or less, or in the range of about 0.25 mm to about 0.4 mm.

[0046] For example, the light-emitting element of the light source unit (120) may include a mini LED chip or a micro LED chip.

[0047] One or more light source units (120) may be disposed within a pixel area. Here, when multiple light-emitting elements are disposed within a pixel area, the light source units (120) may emit different colors. For example, multiple light-emitting elements may emit different colors among blue, green, red, yellow, and white. For another example, multiple light-emitting elements may emit the same color among blue, green, red, yellow, and white. Here, blue, green, red, yellow, and white may include wavelength bands of each color or include similar colors.

[0048] Additionally, the light-emitting device may include a light-emitting diode chip and a phosphor layer, and the phosphor layer may be laminated on the surface of the light-emitting diode chip. Here, the phosphor layer may include at least one or more of a yellow phosphor, a red phosphor, a red phosphor, or a green phosphor, and may include a wavelength conversion material such as a quantum dot.

[0049] Such light-emitting devices can emit blue, green, red, yellow, or white light through the mixing of light generated from a light-emitting diode chip and light whose wavelength has been converted by a phosphor layer.

[0050] Additionally, the light-emitting element can have a light-emitting diode chip mounted on a substrate (100) in a flip-chip manner and can emit light on at least five sides. Here, the at least five sides may include the top surface and four sides of the light-emitting element.

[0051] In some cases, the light-emitting element may include a top-view LED package.

[0052] Next, the partition (300) is a light-blocking member that covers the outer side of the pixel area where the light source unit (120) is placed, and may have a single partition structure, a multiple partition structure, or a double light-blocking structure. Here, the partition (300) can block light interference between adjacent light source units (120) and can block the problem of light penetrating into the pixel area of ​​an adjacent light source unit (120).

[0053] Additionally, the partition wall (300) may have a hole formed corresponding to the pixel area where the light source unit (120) is placed, and the hole in the partition wall (300) can determine the size of the pixel area. Here, the top view shape of the hole in the partition wall (300) may be a polygonal shape having a triangular or square shape, and the polygonal shape may include a shape with angled corners or a curved shape.

[0054] Next, the partition (300) may include a metal material or a resin material. For example, the metal material may be an alloy of at least one or two of aluminum (Al), nickel (Ni), copper (Cu), and silver (Ag), and the resin material may include an epoxy or silicone material. As another example, the partition (300) may be selected from materials such as polyimide (PI), polyurethane (PU), polyvinyl chloride (PVC), polypropylene (PP), polyethylene (PE), and polyethylene terephthalate (PET).

[0055] Depending on the case, the partition wall (300) may be formed in a single layer or multiple layers.

[0056] Additionally, the partition wall (300) may include a light reflector or a light absorber within the resin material, and the light reflector may be Al2O3, TiO2, It may include at least one of SiO2, ZnO, and ZrO2, and the light-absorbing material may include a light-absorbing pigment or dye.

[0057] Additionally, the upper surface width of the partition wall (300) may be the minimum distance between adjacent pixel areas, such as 1.1 mm or less, for example, in the range of 0.5 mm to 1.1 mm or in the range of 0.7 mm to 1 mm. Here, if the upper surface width of the partition wall (300) is larger than the above range, the dark area between pixels may be increased, and if it is smaller than the above range, light leakage may occur or there may be difficulties in manufacturing.

[0058] Additionally, the height of the partition wall (300) may be greater than the thickness of the light source part (120) based on the upper surface of the substrate (100).

[0059] Additionally, the side of the partition wall (300) may have a predetermined angle with respect to the upper surface of the substrate (100) for light reflection, and the angle may be about 91 degrees or more, for example, in the range of about 91 degrees to about 95 degrees or in the range of about 92 degrees to about 94 degrees. Here, if the angle is greater than the above range, light emitted through the pixel area may propagate onto adjacent pixel areas, and pixel brightness may decrease, and if the angle is smaller than the above range, light extraction efficiency may decrease.

[0060] Additionally, within the pixel area defined by the partition wall (300), a transparent resin layer can be formed to seal the light-emitting element of the light source unit (120). Here, the resin layer can protect the light-emitting element from moisture.

[0061] Next, a reflective layer may be disposed between the partition wall (300) and the substrate (100), and the reflective layer may be an adhesive layer having a reflective material.

[0062] In some cases, the reflective layer may be disposed on the surface of the partition wall (300), and the reflective layer may be disposed extending to the periphery of the light-emitting element of the light source unit (120) to reflect light incident on the upper surface of the substrate (100). For example, the reflective layer may be made of a material such as silicon or epoxy, or a primer material.

[0063] Additionally, the reflective layer is attached to the surface of the substrate (100) and may include a reflective material inside, for example, the reflective material may be Al2O3, TiO2, It may include at least one of SiO2, ZnO, and ZrO2.

[0064] Next, the optical member (500) may have a first thickness in an area closer to the light source (120) than a second thickness in an area farther from the light source (120).

[0065] The optical member (500) may include a first surface facing the direction in which the light source unit (120) is positioned and a second surface facing the opposite direction in which the light source unit (120) is positioned. The first surface of the optical member (500) may include a curved surface, and the second surface of the optical member (500) may include a flat surface. This is because the optical member (500) can provide pixel lighting with high light uniformity and brightness by simultaneously performing a diffuser function and a pattern mask function. For example, the first surface of the optical member (500) may have a curved surface formed in the area facing between the light source unit (120) and the partition wall (300), and the curved surface may have a convex curved shape.

[0066] Additionally, the first surface of the optical member (500) may have a flat surface formed in the area facing the upper surface of the light source part (120). Here, the flat surface of the optical member (500) may be parallel to the upper surface of the light source part (120).

[0067] Additionally, the area of ​​the flat surface formed on the first surface of the optical member (500) may be the same as the area of ​​the upper surface of the light source part (120).

[0068] In some cases, the area of ​​the flat surface formed on the first surface of the optical member (500) may be larger than the area of ​​the upper surface of the light source part (120).

[0069] Next, the first thickness of the optical member (500) can be determined based on the height of the partition wall (300), and the first thickness of the optical member (500) may have a maximum thickness less than or equal to the maximum height of the partition wall (300). For example, the first thickness of the optical member (500) may have a range of about 1 mm to about 7 mm.

[0070] Additionally, the optical member (500) may be made of a transparent silicone material.

[0071] Additionally, the optical member (500) includes an edge region facing the upper surface of the partition wall (300), and the edge region of the optical member (500) and the upper surface of the partition wall (300) may have flat surfaces. Here, the edge region of the optical member (500) and the upper surface of the partition wall (300) may be attached by an adhesive member. For example, the adhesive member may be an adhesive or double-sided tape, or an adhesive film having a silicone or PET (Polyethylene terephthalate) material. The thickness of the adhesive member may be thinner than the thickness of the optical member (500).

[0072] Next, the upper surface of the partition wall (300) has a protrusion formed in a central area, and the optical member (500) may include an edge area facing the upper surface of one side of the protrusion of the partition wall (300), and the edge area of ​​the optical member (500) may have a flat surface. Here, the edge area of ​​the optical member (500) and the upper surface located on one side of the protrusion of the partition wall (300) may be attached by an adhesive member.

[0073] In some cases, the upper surface located on one side of the edge region of the optical member (500) and the protrusion of the partition wall (300) may be attached by a first adhesive member, and the side of the edge region of the optical member (500) and the side of the protrusion of the partition wall (300) may be attached by a second adhesive member. Here, the first and second adhesive members may be the same or different from each other.

[0074] For example, the height of the protrusion of the bulkhead (300) may be the same as the thickness of the edge region of the optical member (500).

[0075] Additionally, the protrusions of the partition wall (300) can be formed integrally with the same material as the partition wall (300).

[0076] In some cases, the protrusion of the partition wall (300) may be formed as a detachable type that is detachable from the upper surface of the partition wall (300). Here, the protrusion of the partition wall (300) may be made of a material different from the body of the partition wall (300).

[0077] Next, the optical member (500) may include a frame positioned on a side edge, wherein the frame of the optical member (500) is positioned to face the upper surface of the partition wall (300), and the frame of the optical member (500) and the upper surface of the partition wall (300) may have flat surfaces. Here, the frame of the optical member (500) and the upper surface of the partition wall (300) may be attached by an adhesive member. As an example, the frame of the optical member (500) may be made of an opaque material that blocks light.

[0078] Next, the upper surface of the partition wall (300) has a protrusion formed in the central area, and the optical member (500) includes a frame disposed on the side edge, and the frame of the optical member (500) is disposed to face the upper surface located on one side of the protrusion of the partition wall (300), and the upper surface located on one side of the protrusion of the partition wall (300) and the frame of the optical member (500) may have a flat surface.

[0079] Here, the upper surface located on one side of the protrusion of the bulkhead (300) and the frame of the optical member (500) can be attached by an adhesive member.

[0080] In some cases, the upper surface located on one side of the frame of the optical member (500) and the protrusion of the partition wall (300) may be attached by a first adhesive member, and the side of the frame of the optical member (500) and the side of the protrusion of the partition wall (300) may be attached by a second adhesive member. Here, the first and second adhesive members may be the same or different from each other.

[0081] Additionally, the height of the protrusion of the bulkhead (300) may be the same as the frame thickness of the optical member (500).

[0082] Next, the upper surface of the partition wall (300) has a protrusion formed in the central area, and the optical member (500) includes a frame disposed on the side edge, and the frame of the optical member (500) may have a groove formed in the area facing the protrusion of the partition wall (300). Here, the groove formed in the frame of the optical member (500) may be inserted into and coupled with the protrusion of the partition wall (300).

[0083] In some cases, the groove formed in the frame of the optical member (500) and the protrusion of the partition wall (300) can be attached by an adhesive member.

[0084] For example, the height of the protrusion of the bulkhead (300) may be the same as the depth of the groove formed in the frame of the optical member (500).

[0085] In this way, a lighting device according to one embodiment can provide pixel lighting with high light uniformity and brightness by arranging an optical member having a thickness greater in a region close to the light source than in a region far from the light source to simultaneously perform diffuser and pattern mask functions, and can improve assembly and cost competitiveness by minimizing manufacturing and assembly processes.

[0086] FIGS. 4 to 6 are exemplary drawings showing a lighting device according to another embodiment.

[0087] FIG. 4 is a perspective view of a lighting device according to one embodiment, FIG. 5 is a cross-sectional perspective view of FIG. 4, and FIG. 6 is a side cross-sectional view of FIG. 4.

[0088] As illustrated in FIGS. 4 to 6, the lighting device (1000) may include a substrate (100), a light source unit (120) disposed on the substrate, a partition (300) disposed around the light source unit (120), and an optical member (500) disposed on the upper part of the light source unit (120).

[0089] Here, the optical member (500) may include a first surface facing the direction in which the light source unit (120) is positioned and a second surface facing the opposite direction in which the light source unit (120) is positioned, wherein the first surface of the optical member (500) may include a curved surface and the second surface of the optical member (500) may include a flat surface. This is because the optical member (500) can provide pixel lighting with high light uniformity and brightness by simultaneously performing a diffuser function and a pattern mask function.

[0090] For example, the first surface of the optical member (500) has a curved surface formed in the area facing the light source part (120) and the partition wall (300), and the curved surface may have a concave curved shape.

[0091] Additionally, the first surface of the optical member (500) may have a flat surface formed in the area facing the upper surface of the light source part (120). Here, the flat surface of the optical member (500) may be parallel to the upper surface of the light source part (120).

[0092] Next, the first thickness of the optical member (500) can be determined based on the height of the partition wall (300), and the first thickness of the optical member (500) may have a maximum thickness less than or equal to the maximum height of the partition wall (300). For example, the first thickness of the optical member (500) may have a range of about 1 mm to about 7 mm.

[0093] Additionally, the optical member (500) may be made of a transparent silicone material.

[0094] Additionally, the optical member (500) includes an edge region facing the upper surface of the partition wall (300), and the edge region of the optical member (500) and the upper surface of the partition wall (300) may have flat surfaces. Here, the edge region of the optical member (500) and the upper surface of the partition wall (300) may be attached by an adhesive member.

[0095] In some cases, the upper surface of the partition wall (300) may have a protrusion formed in a central area, and the optical member (500) may include an edge area facing the upper surface of one side of the protrusion of the partition wall (300), and the edge area of ​​the optical member (500) may have a flat surface. Here, the edge area of ​​the optical member (500) and the upper surface located on one side of the protrusion of the partition wall (300) may be attached by an adhesive member.

[0096] In another case, the optical member (500) may include a frame disposed on a side edge, wherein the frame of the optical member (500) is disposed to face the upper surface of the partition wall (300), and the frame of the optical member (500) and the upper surface of the partition wall (300) may have flat surfaces. Here, the frame of the optical member (500) and the upper surface of the partition wall (300) may be attached by an adhesive member.

[0097] In another case, the upper surface of the partition wall (300) has a protrusion formed in a central area, and the optical member (500) includes a frame disposed on a side edge, the frame of the optical member (500) is disposed to face the upper surface located on one side of the protrusion of the partition wall (300), and the upper surface located on one side of the protrusion of the partition wall (300) and the frame of the optical member (500) may have flat surfaces. Here, the upper surface located on one side of the protrusion of the partition wall (300) and the frame of the optical member (500) may be attached by an adhesive member.

[0098] In another case, the upper surface of the partition wall (300) has a protrusion formed in a central area, and the optical member (500) includes a frame disposed on a side edge, and the frame of the optical member (500) may have a groove formed in an area facing the protrusion of the partition wall (300). Here, the groove formed in the frame of the optical member (500) may be inserted into and coupled with the protrusion of the partition wall (300).

[0099] In another embodiment, the optical member (500) may include a first surface facing the direction in which the light source unit (120) is positioned and a second surface facing the opposite direction in which the light source unit (120) is positioned, wherein the first surface of the optical member (500) may include an inclined surface and the second surface of the optical member (500) may include a flat surface. For example, the first surface of the optical member (500) may have an inclined surface formed in the area facing between the light source unit (120) and the partition wall (300), and the inclined surface may have an inclined direction toward the light source unit (120).

[0100] Additionally, the first surface of the optical member (500) may have a flat surface formed in the area facing the upper surface of the light source part (120). Here, the flat surface of the optical member (500) may be parallel to the upper surface of the light source part (120).

[0101] And, the area of ​​the flat surface formed on the first surface of the optical member (500) may be the same as the area of ​​the upper surface of the light source part (120).

[0102] In some cases, the area of ​​the flat surface formed on the first surface of the optical member (500) may be larger than the area of ​​the upper surface of the light source part (120).

[0103] Meanwhile, the lighting device (1000) may include a substrate (100), a display area having a light source unit (120) disposed on the substrate (100), a partition (300) disposed around each of the pixel areas having a light source unit (120) on the substrate (100), and an optical member (500) disposed on the pixel area.

[0104] The lighting device (1000) may have a plurality of pixel regions arranged in a first direction (X) and a second direction (Y), and at least one light source (120) may be disposed within each pixel region.

[0105] The lighting device (1000) displays images or information such as symbols, logos, symbols, or characters by means of light source parts each disposed within pixel areas, and can be defined as a lighting module or a display lamp. That is, the lighting device (1000) displays images or information such as symbols, logos, symbols, or characters through a display area.

[0106] Additionally, the lighting device (1000) can be implemented as pixel lighting using pixel regions.

[0107] The lighting device (1000) controls the operation of the light source unit (120) within the pixel area through a control unit (not shown) according to the image or information to be displayed, and displays the image or information by the light extracted through the pixel area by the turn-on or turn-off of the light source unit (120).

[0108] A light source placed within a pixel area is turned on or off depending on whether power is supplied. Here, the pixel area can be implemented as a grid type or a unit cell type and can function as a pixel, which is the smallest unit constituting an image or information. That is, the pixel area can be defined as a unit pixel or a unit light-emitting part.

[0109] The top-view shape of the pixel area can be a polygonal shape such as a square or a triangle, or can be provided as a circle or an ellipse.

[0110] The top-view shape of the display area having pixel regions may be a polygonal shape, such as a triangular or rectangular shape, or a circular or elliptical shape. The top-view shape of the display area having pixel regions may have a shape such as a symbol, logo, or character.

[0111] FIGS. 7 to 9 are exemplary drawings showing a lighting device according to another embodiment.

[0112] FIG. 7 is a perspective view of a lighting device according to one embodiment, FIG. 8 is a cross-sectional perspective view of FIG. 7, and FIG. 9 is a side cross-sectional view of FIG. 7.

[0113] As illustrated in FIGS. 7 to 9, the lighting device (1000) may include a substrate (100), a light source unit (120) disposed on the substrate, a partition (300) disposed around the light source unit (120), and an optical member (500) disposed on the upper part of the light source unit (120).

[0114] The substrate (100) 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. Here, if the substrate (100) is a flexible PCB, the lighting device (1000) may have flexible characteristics.

[0115] Additionally, the substrate (100) has one or more coupling holes, and the lighting device (1000) can be fastened to a bracket (not shown) through the coupling holes using a fastening means (not shown).

[0116] And, the substrate (100) can be electrically connected to at least one light source unit (120).

[0117] The substrate (100) includes a wiring layer on its upper surface, and the wiring layer can be electrically connected to at least one light source (120).

[0118] The substrate (100) may be a single-layer substrate having a single wiring layer or a multilayer substrate having multiple wiring layers. If the substrate (100) is a single-layer substrate, the substrate (100) may have a protective layer on the upper surface of the wiring layer, an insulating layer on the lower surface of the wiring layer, and a metal layer disposed below the insulating layer. If the substrate (100) is a multilayer substrate, the substrate (100) may have a protective layer on the upper surface of the upper wiring layer, an insulating layer on the lower surface of the upper wiring layer, and a layer for lower wiring disposed below the insulating layer, and the layer for lower wiring may be connected to the upper wiring layer through vias. Here, the protective layer of the substrate (100) is a layer for protecting the wiring layer and may be formed of a solder resistor material or a reflective material, and the color of the reflective material may be provided as white.

[0119] Next, the light source (120) emits the highest light in the third direction (Z) or the optical axis direction, where the third direction (Z) is a direction orthogonal to the first and second directions (X,Y) and may be a direction from the substrate (100) toward the optical member (500).

[0120] The light source unit (120) is mounted on the substrate (100) and can be provided as an LED chip or a package covering the surface of the LED chip with resin.

[0121] The light source unit (120) is a light-emitting device having a light-emitting diode chip (LED Chip), and may include various forms such as a package in which the light-emitting diode chip is packaged, a flip-chip, or a CSP (Chip scale package). Here, the light-emitting diode chip may emit at least one of blue, red, green, ultraviolet (UV), or infrared light, and the light source unit (120) may emit at least one of white, blue, red, green, or infrared light, and may emit light in a colored light such as white, blue, or green.

[0122] The thickness (T0) or height of the light source part (120) may be about 0.4 mm or less, or in the range of about 0.25 mm to about 0.4 mm.

[0123] For example, the light-emitting element of the light source unit (120) may include a mini LED chip or a micro LED chip.

[0124] One or more light source units (120) may be placed within the pixel area.

[0125] Here, the light source unit (120) allows the light-emitting elements to emit different colors when a plurality of light-emitting elements are arranged within a pixel area. For example, the plurality of light-emitting elements may emit different colors among blue, green, red, yellow, and white. For another example, the plurality of light-emitting elements may emit the same color among blue, green, red, yellow, and white. Here, blue, green, red, yellow, and white may include wavelength bands of each color or include similar colors.

[0126] Additionally, the light-emitting device may include a light-emitting diode chip and a phosphor layer, and the phosphor layer may be laminated on the surface of the light-emitting diode chip. Here, the phosphor layer may include at least one or more of a yellow phosphor, a red phosphor, a red phosphor, or a green phosphor, and may include a wavelength conversion material such as a quantum dot.

[0127] Such light-emitting devices can emit blue, green, red, yellow, or white light through the mixing of light generated from a light-emitting diode chip and light whose wavelength has been converted by a phosphor layer.

[0128] Additionally, the light-emitting element can have a light-emitting diode chip mounted on a substrate (100) in a flip-chip manner and can emit light on at least five sides. Here, the at least five sides may include the top surface and four sides of the light-emitting element.

[0129] In some cases, the light-emitting element may include a top-view LED package.

[0130] Next, the partition (300) is a light-blocking member that covers the outer side of the pixel area where the light source unit (120) is placed, and may have a single partition structure, a multiple partition structure, or a double light-blocking structure. Here, the partition (300) can block light interference between adjacent light source units (120) and can block the problem of light penetrating into the pixel area of ​​an adjacent light source unit (120).

[0131] Additionally, the partition wall (300) may have a hole formed in correspondence with the pixel area where the light source part (120) is placed, and the hole in the partition wall (300) can determine the size of the pixel area.

[0132] Here, the top view shape of the hole in the bulkhead (300) may be a polygonal shape having a triangular or square shape, and the polygonal shape may include a shape with angled corners or a curved shape.

[0133] Next, the partition (300) may include a metal material or a resin material. For example, the metal material may be an alloy of at least one or two of aluminum (Al), nickel (Ni), copper (Cu), and silver (Ag), and the resin material may include an epoxy or silicone material. As another example, the partition (300) may be selected from materials such as polyimide (PI), polyurethane (PU), polyvinyl chloride (PVC), polypropylene (PP), polyethylene (PE), and polyethylene terephthalate (PET).

[0134] Depending on the case, the partition wall (300) may be formed in a single layer or multiple layers.

[0135] Additionally, the partition wall (300) may include a light reflector or a light absorber within the resin material, and the light reflector may be Al2O3, TiO2, It may include at least one of SiO2, ZnO, and ZrO2, and the light-absorbing material may include a light-absorbing pigment or dye.

[0136] Additionally, the upper surface width of the partition wall (300) may be the minimum distance between adjacent pixel areas, such as 1.1 mm or less, for example, in the range of 0.5 mm to 1.1 mm or in the range of 0.7 mm to 1 mm.

[0137] Here, if the upper surface width of the partition wall (300) is larger than the above range, the dark area between pixels may be increased, and if it is smaller than the above range, light leakage may occur or there may be difficulties in manufacturing.

[0138] Additionally, the height of the partition wall (300) may be greater than the thickness of the light source part (120) based on the upper surface of the substrate (100).

[0139] Additionally, the side of the partition wall (300) may have a predetermined angle with respect to the upper surface of the substrate (100) for light reflection, and the angle may be about 91 degrees or more, for example, in the range of about 91 degrees to about 95 degrees or in the range of about 92 degrees to about 94 degrees. Here, if the angle is greater than the above range, light emitted through the pixel area may propagate onto adjacent pixel areas, and pixel brightness may decrease, and if the angle is smaller than the above range, light extraction efficiency may decrease.

[0140] Additionally, within the pixel area defined by the partition wall (300), a transparent resin layer can be formed to seal the light-emitting element of the light source unit (120). Here, the resin layer can protect the light-emitting element from moisture.

[0141] Next, a reflective layer may be disposed between the partition wall (300) and the substrate (100), and the reflective layer may be an adhesive layer having a reflective material.

[0142] In some cases, the reflective layer may be disposed on the surface of the partition wall (300), and the reflective layer may be disposed extending to the periphery of the light-emitting element of the light source unit (120) to reflect light incident on the upper surface of the substrate (100).

[0143] For example, the reflective layer may be a material such as silicone or epoxy, or a primer material.

[0144] Additionally, the reflective layer is attached to the surface of the substrate (100) and may include a reflective material inside, for example, the reflective material may be Al2O3, TiO2, It may include at least one of SiO2, ZnO, and ZrO2.

[0145] Next, the optical member (500) has a pattern in which a plurality of through holes (510) are formed, and the pattern density in the area close to the light source (120) may be lower than the pattern density in the area far from the light source (120).

[0146] The optical member (500) may include a pattern area where a pattern is formed and a non-pattern area surrounding the pattern area. The pattern area may include a first area that overlaps vertically with the light source member (120), a second area adjacent to the first area, and a third area adjacent to the second area. Here, the first area may be formed in the center of the pattern area, the second area may be formed to surround the first area, and the third area may be formed at the edge of the pattern area surrounding the second area.

[0147] For example, the number of through holes (510) per unit area can increase as it moves from the first area toward the third area.

[0148] Additionally, the through hole (510) may include a plurality of first through holes formed in a first area, a plurality of second through holes formed in a second area, and a plurality of third through holes formed in a third area. Here, the number of first through holes per unit area is less than the number of second through holes per unit area, and the number of second through holes per unit area may be less than the number of third through holes per unit area.

[0149] Additionally, the through holes (510) may include a plurality of first through holes formed in a first area, a plurality of second through holes formed in a second area, and a plurality of third through holes formed in a third area, wherein the average distance between the first through holes is greater than the average distance between the second through holes, and the average distance between the second through holes is greater than the average distance between the third through holes.

[0150] And, the non-pattern area of ​​the optical member (500) can be overlapped in a vertical direction with the partition wall (300).

[0151] Additionally, the area of ​​the first region of the optical member (500) can be formed in a range of about 1 to about 1.1 times the upper surface area of ​​the light source part (120).

[0152] Additionally, the third region of the optical member (500) can be formed in a range of about 10% to about 30% of the distance from the corner of the pattern region to the center of the light source part (120).

[0153] Next, the optical member (500) may have a first thickness in an area closer to the light source (120) than a second thickness in an area farther from the light source (120).

[0154] The optical member (500) may include a first surface facing the direction in which the light source unit (120) is positioned and a second surface facing the opposite direction in which the light source unit (120) is positioned, wherein the first surface of the optical member (500) may include a curved surface and the second surface of the optical member (500) may include a flat surface. This is because the optical member (500) can provide pixel lighting with high light uniformity and brightness by simultaneously performing a diffuser function and a pattern mask function.

[0155] For example, the first surface of the optical member (500) has a curved surface formed in the area facing the light source part (120) and the partition wall (300), and the curved surface may have a convex curved shape.

[0156] Additionally, the first surface of the optical member (500) may have a flat surface formed in the area facing the upper surface of the light source part (120). Here, the flat surface of the optical member (500) may be parallel to the upper surface of the light source part (120).

[0157] Additionally, the area of ​​the flat surface formed on the first surface of the optical member (500) may be the same as the area of ​​the upper surface of the light source part (120).

[0158] In some cases, the area of ​​the flat surface formed on the first surface of the optical member (500) may be larger than the area of ​​the upper surface of the light source part (120).

[0159] In another embodiment, the first and second surfaces of the optical member (500) may include a flat surface overall.

[0160] Next, the first thickness of the optical member (500) can be determined based on the height of the partition wall (300), and the first thickness of the optical member (500) may have a maximum thickness less than or equal to the maximum height of the partition wall (300). For example, the first thickness of the optical member (500) may have a range of about 1 mm to about 7 mm.

[0161] Additionally, the optical member (500) may be made of a transparent silicone material.

[0162] And, the optical member (500) includes an edge region facing the upper surface of the partition wall (300), and the edge region of the optical member (500) and the upper surface of the partition wall (300) may have a flat surface.

[0163] Here, the edge region of the optical member (500) and the upper surface of the partition wall (300) can be attached by an adhesive member. For example, the adhesive member may be an adhesive or double-sided tape, or an adhesive film having a silicone or PET (Polyethylene terephthalate) material. The thickness of the adhesive member may be thinner than the thickness of the optical member (500).

[0164] Next, the upper surface of the partition wall (300) has a protrusion formed in a central area, and the optical member (500) may include an edge area facing the upper surface of one side of the protrusion of the partition wall (300), and the edge area of ​​the optical member (500) may have a flat surface. Here, the edge area of ​​the optical member (500) and the upper surface located on one side of the protrusion of the partition wall (300) may be attached by an adhesive member.

[0165] In some cases, the upper surface located on one side of the edge region of the optical member (500) and the protrusion of the partition wall (300) may be attached by a first adhesive member, and the side of the edge region of the optical member (500) and the side of the protrusion of the partition wall (300) may be attached by a second adhesive member. Here, the first and second adhesive members may be the same or different from each other.

[0166] For example, the height of the protrusion of the bulkhead (300) may be the same as the thickness of the edge region of the optical member (500).

[0167] Additionally, the protrusions of the partition wall (300) can be formed integrally with the same material as the partition wall (300).

[0168] In some cases, the protrusion of the partition wall (300) may be formed as a detachable type that is detachable from the upper surface of the partition wall (300). Here, the protrusion of the partition wall (300) may be made of a material different from the body of the partition wall (300).

[0169] Next, the optical member (500) may include a frame positioned on a side edge, wherein the frame of the optical member (500) is positioned to face the upper surface of the partition wall (300), and the frame of the optical member (500) and the upper surface of the partition wall (300) may have flat surfaces. Here, the frame of the optical member (500) and the upper surface of the partition wall (300) may be attached by an adhesive member. As an example, the frame of the optical member (500) may be made of an opaque material that blocks light.

[0170] Next, the upper surface of the partition wall (300) has a protrusion formed in the central area, and the optical member (500) includes a frame disposed on the side edge, and the frame of the optical member (500) is disposed to face the upper surface located on one side of the protrusion of the partition wall (300), and the upper surface located on one side of the protrusion of the partition wall (300) and the frame of the optical member (500) may have flat surfaces. Here, the upper surface located on one side of the protrusion of the partition wall (300) and the frame of the optical member (500) may be attached by an adhesive member.

[0171] In some cases, the upper surface located on one side of the frame of the optical member (500) and the protrusion of the partition wall (300) may be attached by a first adhesive member, and the side of the frame of the optical member (500) and the side of the protrusion of the partition wall (300) may be attached by a second adhesive member. Here, the first and second adhesive members may be the same or different from each other.

[0172] Additionally, the height of the protrusion of the bulkhead (300) may be the same as the frame thickness of the optical member (500).

[0173] Next, the upper surface of the partition wall (300) has a protrusion formed in the central area, and the optical member (500) includes a frame disposed on the side edge, and the frame of the optical member (500) may have a groove formed in the area facing the protrusion of the partition wall (300). Here, the groove formed in the frame of the optical member (500) may be inserted into and coupled with the protrusion of the partition wall (300).

[0174] In some cases, the groove formed in the frame of the optical member (500) and the protrusion of the partition wall (300) can be attached by an adhesive member.

[0175] For example, the height of the protrusion of the bulkhead (300) may be the same as the depth of the groove formed in the frame of the optical member (500).

[0176] In this way, a lighting device according to one embodiment can provide pixel lighting with high light uniformity and brightness by simultaneously performing diffuser and pattern mask functions by arranging an optical member in which the density of through-hole patterns in an area close to the light source is lower than the density of through-hole patterns in an area far from the light source, and can improve assembly and cost competitiveness by minimizing manufacturing and assembly processes.

[0177] FIGS. 10 to 12 are exemplary drawings showing a lighting device according to another embodiment.

[0178] FIG. 10 is a perspective view of a lighting device according to one embodiment, FIG. 11 is a cross-sectional perspective view of FIG. 10, and FIG. 12 is a side cross-sectional view of FIG. 10.

[0179] As illustrated in FIGS. 10 to 12, the lighting device (1000) may include a substrate (100), a light source unit (120) disposed on the substrate, a partition (300) disposed around the light source unit (120), and an optical member (500) disposed on the upper part of the light source unit (120).

[0180] Here, the optical member (500) has a pattern in which a plurality of through holes (510) are formed, and the pattern density in the area close to the light source (120) may be lower than the pattern density in the area far from the light source (120).

[0181] The optical member (500) may include a pattern area where a pattern is formed and a non-pattern area surrounding the pattern area. The pattern area may include a first area that overlaps vertically with the light source member (120), a second area adjacent to the first area, and a third area adjacent to the second area. Here, the first area may be formed in the center of the pattern area, the second area may be formed to surround the first area, and the third area may be formed at the edge of the pattern area surrounding the second area.

[0182] For example, the number of through holes (510) per unit area can increase as it moves from the first area toward the third area.

[0183] Additionally, the through hole (510) may include a plurality of first through holes formed in a first area, a plurality of second through holes formed in a second area, and a plurality of third through holes formed in a third area. Here, the number of first through holes per unit area is less than the number of second through holes per unit area, and the number of second through holes per unit area may be less than the number of third through holes per unit area.

[0184] Additionally, the through holes (510) may include a plurality of first through holes formed in a first area, a plurality of second through holes formed in a second area, and a plurality of third through holes formed in a third area, wherein the average distance between the first through holes is greater than the average distance between the second through holes, and the average distance between the second through holes is greater than the average distance between the third through holes.

[0185] And, the non-pattern area of ​​the optical member (500) can be overlapped in a vertical direction with the partition wall (300).

[0186] Additionally, the area of ​​the first region of the optical member (500) can be formed in a range of about 1 to about 1.1 times the upper surface area of ​​the light source part (120).

[0187] Additionally, the third region of the optical member (500) can be formed in a range of about 10% to about 30% of the distance from the corner of the pattern region to the center of the light source part (120).

[0188] Additionally, the optical member (500) may include a first surface facing the direction in which the light source unit (120) is positioned and a second surface facing the opposite direction in which the light source unit (120) is positioned, wherein the first surface of the optical member (500) may include a curved surface and the second surface of the optical member (500) may include a flat surface. This is because the optical member (500) can provide pixel lighting with high light uniformity and brightness by simultaneously performing a diffuser function and a pattern mask function.

[0189] For example, the first surface of the optical member (500) has a curved surface formed in the area facing the light source part (120) and the partition wall (300), and the curved surface may have a concave curved shape.

[0190] Additionally, the first surface of the optical member (500) may have a flat surface formed in the area facing the upper surface of the light source part (120). Here, the flat surface of the optical member (500) may be parallel to the upper surface of the light source part (120).

[0191] In another embodiment, the first and second surfaces of the optical member (500) may include a flat surface overall.

[0192] Next, the first thickness of the optical member (500) can be determined based on the height of the partition wall (300), and the first thickness of the optical member (500) may have a maximum thickness less than or equal to the maximum height of the partition wall (300). For example, the first thickness of the optical member (500) may have a range of about 1 mm to about 7 mm.

[0193] Additionally, the optical member (500) may be made of a transparent silicone material.

[0194] Additionally, the optical member (500) includes an edge region facing the upper surface of the partition wall (300), and the edge region of the optical member (500) and the upper surface of the partition wall (300) may have flat surfaces. Here, the edge region of the optical member (500) and the upper surface of the partition wall (300) may be attached by an adhesive member.

[0195] In some cases, the upper surface of the partition wall (300) may have a protrusion formed in a central area, and the optical member (500) may include an edge area facing the upper surface of one side of the protrusion of the partition wall (300), and the edge area of ​​the optical member (500) may have a flat surface. Here, the edge area of ​​the optical member (500) and the upper surface located on one side of the protrusion of the partition wall (300) may be attached by an adhesive member.

[0196] In another case, the optical member (500) may include a frame disposed on a side edge, wherein the frame of the optical member (500) is disposed to face the upper surface of the partition wall (300), and the frame of the optical member (500) and the upper surface of the partition wall (300) may have flat surfaces. Here, the frame of the optical member (500) and the upper surface of the partition wall (300) may be attached by an adhesive member.

[0197] In another case, the upper surface of the partition wall (300) has a protrusion formed in a central area, and the optical member (500) includes a frame disposed on a side edge, the frame of the optical member (500) is disposed to face the upper surface located on one side of the protrusion of the partition wall (300), and the upper surface located on one side of the protrusion of the partition wall (300) and the frame of the optical member (500) may have flat surfaces. Here, the upper surface located on one side of the protrusion of the partition wall (300) and the frame of the optical member (500) may be attached by an adhesive member.

[0198] In another case, the upper surface of the partition wall (300) has a protrusion formed in a central area, and the optical member (500) includes a frame disposed on a side edge, and the frame of the optical member (500) may have a groove formed in an area facing the protrusion of the partition wall (300). Here, the groove formed in the frame of the optical member (500) may be inserted into and coupled with the protrusion of the partition wall (300).

[0199] In another embodiment, the optical member (500) may include a first surface facing the direction in which the light source unit (120) is positioned and a second surface facing the opposite direction in which the light source unit (120) is positioned, wherein the first surface of the optical member (500) may include an inclined surface and the second surface of the optical member (500) may include a flat surface. For example, the first surface of the optical member (500) may have an inclined surface formed in the area facing between the light source unit (120) and the partition wall (300), and the inclined surface may have an inclined direction toward the light source unit (120).

[0200] Additionally, the first surface of the optical member (500) may have a flat surface formed in the area facing the upper surface of the light source part (120). Here, the flat surface of the optical member (500) may be parallel to the upper surface of the light source part (120).

[0201] And, the area of ​​the flat surface formed on the first surface of the optical member (500) may be the same as the area of ​​the upper surface of the light source part (120).

[0202] In some cases, the area of ​​the flat surface formed on the first surface of the optical member (500) may be larger than the area of ​​the upper surface of the light source part (120).

[0203] FIG. 13 is an illustrative diagram showing a lighting device according to another embodiment.

[0204] As illustrated in FIG. 13, the lighting device (1000) may include a substrate (100), a light source unit (120) disposed on the substrate, a partition (300) disposed around the light source unit (120), and an optical member (500) disposed on the upper part of the light source unit (120).

[0205] Here, the optical member (500) may include a first surface facing the direction in which the light source part (120) is placed and a second surface facing the opposite direction in which the light source part (120) is placed, and the first surface and the second surface of the optical member (500) may include a flat surface overall.

[0206] The optical member (500) has a pattern in which a plurality of through holes (510) are formed, and the pattern density in the area close to the light source (120) may be lower than the pattern density in the area far from the light source (120).

[0207] The optical member (500) may include a pattern area where a pattern is formed and a non-pattern area surrounding the pattern area. The pattern area may include a first area that overlaps vertically with the light source member (120), a second area adjacent to the first area, and a third area adjacent to the second area. Here, the first area may be formed in the center of the pattern area, the second area may be formed to surround the first area, and the third area may be formed at the edge of the pattern area surrounding the second area.

[0208] For example, the number of through holes (510) per unit area can increase as it moves from the first area toward the third area.

[0209] Additionally, the through hole (510) may include a plurality of first through holes formed in a first area, a plurality of second through holes formed in a second area, and a plurality of third through holes formed in a third area. Here, the number of first through holes per unit area is less than the number of second through holes per unit area, and the number of second through holes per unit area may be less than the number of third through holes per unit area.

[0210] Additionally, the through holes (510) may include a plurality of first through holes formed in a first area, a plurality of second through holes formed in a second area, and a plurality of third through holes formed in a third area, wherein the average distance between the first through holes is greater than the average distance between the second through holes, and the average distance between the second through holes is greater than the average distance between the third through holes.

[0211] And, the non-pattern area of ​​the optical member (500) can be overlapped in a vertical direction with the partition wall (300).

[0212] Additionally, the area of ​​the first region of the optical member (500) can be formed in a range of about 1 to about 1.1 times the upper surface area of ​​the light source part (120).

[0213] Additionally, the third region of the optical member (500) can be formed in a range of about 10% to about 30% of the distance from the corner of the pattern region to the center of the light source part (120).

[0214] Meanwhile, the lighting device (1000) may include a substrate (100), a display area having a light source unit (120) disposed on the substrate (100), a partition (300) disposed around each of the pixel areas having a light source unit (120) on the substrate (100), and an optical member (500) disposed on the pixel area.

[0215] The lighting device (1000) may have a plurality of pixel regions arranged in a first direction (X) and a second direction (Y), and at least one light source (120) may be disposed within each pixel region.

[0216] The lighting device (1000) displays images or information such as symbols, logos, symbols, or characters by means of light source parts each disposed within pixel areas, and can be defined as a lighting module or a display lamp. That is, the lighting device (1000) displays images or information such as symbols, logos, symbols, or characters through a display area.

[0217] Additionally, the lighting device (1000) can be implemented as pixel lighting using pixel regions.

[0218] The lighting device (1000) controls the operation of the light source unit (120) within the pixel area through a control unit (not shown) according to the image or information to be displayed, and displays the image or information by the light extracted through the pixel area by the turn-on or turn-off of the light source unit (120).

[0219] A light source placed within a pixel area is turned on or off depending on whether power is supplied. Here, the pixel area can be implemented as a grid type or a unit cell type and can function as a pixel, which is the smallest unit constituting an image or information. That is, the pixel area can be defined as a unit pixel or a unit light-emitting part.

[0220] The top-view shape of the pixel area can be a polygonal shape such as a square or a triangle, or can be provided as a circle or an ellipse.

[0221] The top-view shape of the display area having pixel regions may be a polygonal shape such as a triangular shape or a rectangular shape, or a circular shape or an elliptical shape.

[0222] The top-view shape of the display area having pixel regions may have a shape such as a symbol, logo, symbol, or character.

[0223] Meanwhile, the embodiments may be manufactured as a single unit by injection molding the partition wall (300) and the optical member (500) together, or as an assembly type by manufacturing the partition wall (300) and the optical member (500) separately and assembling them together.

[0224] Additionally, in the embodiments, the planar shape of the through hole (510) formed in the optical member (500) may be any polygon including a circle. That is, the planar shape of the through hole (510) may include a polygon including a circle, triangle, square, rhombus, pentagon, hexagon, etc.

[0225] Additionally, in the embodiments, the through holes (510) formed in the optical member (500) may be regularly arranged in all polygons including circles when viewed from the top surface, may be irregularly randomly arranged in all polygons including circles, or may be arranged in a mixture of regular and random arrangements. That is, the arrangement of the through holes (510) may include a polygonal arrangement including a circular arrangement, a triangular arrangement, a square arrangement, a rhombus arrangement, a pentagonal arrangement, a hexagonal arrangement, etc.

[0226] Here, the through holes (510) may be arranged regularly at regular intervals or according to specific rules when arranged in a circular or polygonal arrangement, may be arranged randomly and irregularly, or may be arranged in a combination of regular and random arrangements. At this time, the planar shape of the through holes (510) may include a circle and a polygon including a triangle, square, rhombus, pentagon, hexagon, etc.

[0227] Meanwhile, the optical member of the lighting device according to the embodiment may have an optical characteristic changing structure for uniformly diffusing light from a light source, and the optical characteristic changing structure may differentially adjust light transmission characteristics depending on the distance from the light source.

[0228] The optical characteristic change structure may include a thickness change structure in which the first thickness in the region closer to the light source is thicker than the second thickness in the region farther from the light source.

[0229] The optical member includes a first surface facing the direction in which the light source is positioned and a second surface facing the opposite direction in which the light source is positioned, and the first surface of the optical member includes a combination of at least two of a curved surface, an inclined surface, and a flat surface, and the second surface of the optical member may include a flat surface.

[0230] Additionally, the first surface of the optical member has a curved surface formed in the area facing the light source part and the partition wall, and the curved surface may have any one of a convex curved surface shape, a concave curved surface shape, and a composite curved surface shape.

[0231] Additionally, the first surface of the optical member may have a first flat surface formed in a central area facing the upper surface of the light source part, a curved or inclined surface formed in an intermediate area facing between the light source part and the partition wall, and a second flat surface formed in an outer area facing the partition wall.

[0232] The first thickness of the optical member is determined based on the height of the partition wall, and the maximum thickness of the optical member may be less than or equal to the maximum height of the partition wall. For example, the first thickness of the optical member may have a range of about 1 mm to about 7 mm.

[0233] In another case, the optical property change structure of the optical member may include a pattern in which a plurality of through holes are formed, and may also include a pattern density change structure in which the pattern density in an area close to the light source is lower than the pattern density in an area far from the light source.

[0234] The optical member includes a pattern area where a pattern is formed and a non-pattern area surrounding the pattern area, and the pattern area may include a first area that overlaps perpendicularly to the light source, a second area surrounding the first area, and a third area surrounding the second area.

[0235] The through holes may include a plurality of first through holes formed in a first area, a plurality of second through holes formed in a second area, and a plurality of third through holes formed in a third area. Here, the optical member may satisfy the relationship that the number of first through holes per unit area < the number of second through holes per unit area < the number of third through holes per unit area.

[0236] Additionally, the optical member may satisfy the relationship: average distance between first through holes > average distance between second through holes > average distance between third through holes.

[0237] The area of ​​the first region of the optical member can be formed in a range of about 1 to about 1.1 times the upper surface area of ​​the light source part.

[0238] The width of the third region of the optical member may be formed in a range of about 10% to about 30% of the distance from the corner of the pattern region to the center of the light source part.

[0239] In another case, the optical property change structure of the optical member may simultaneously include a thickness change structure and a pattern density change structure.

[0240] The optical member has a first surface facing the direction in which the light source is positioned, which includes a curved or inclined surface, and a plurality of through holes are formed on the first surface, and the pattern density of the through holes may increase as it moves away from the light source.

[0241] The thickness gradient of the thickness variation structure of the optical member and the density gradient of the pattern density variation structure can improve optical uniformity by acting complementarily to each other.

[0242] Meanwhile, the optical member includes an edge region facing the upper surface of the partition wall, and the edge region of the optical member and the upper surface of the partition wall have flat surfaces, and the edge region of the optical member and the upper surface of the partition wall can be attached by an adhesive member. Here, the adhesive member may be any one of an adhesive, double-sided tape, a silicone adhesive film, or a PET adhesive film.

[0243] Additionally, the upper surface of the bulkhead has a protrusion formed in the central region, and the optical member includes an edge region facing the upper surface of one side of the protrusion of the bulkhead, and the edge region of the optical member and the upper surface located on one side of the protrusion of the bulkhead can be attached by an adhesive member.

[0244] The edge region of the optical member and the upper surface of one side of the protrusion of the partition wall are attached by a first adhesive member, and the side of the edge region of the optical member and the side of the protrusion of the partition wall may be attached by a second adhesive member.

[0245] Additionally, the optical member includes a frame positioned on a side edge, and the frame of the optical member is positioned to face the upper surface of the bulkhead, and the frame of the optical member and the upper surface of the bulkhead may be attached by an adhesive member having a flat surface.

[0246] The frame of the optical component may be made of an opaque material that blocks light.

[0247] Next, the upper surface of the bulkhead has a protrusion formed in a central area, and the optical member includes a frame disposed on a side edge, and the frame of the optical member has a groove formed in an area facing the protrusion of the bulkhead, and the groove formed in the frame of the optical member can be inserted into and coupled with the protrusion of the bulkhead.

[0248] The height of the protrusion of the bulkhead may be the same as the depth of the groove formed in the frame of the optical member.

[0249] In another case, the optical member includes a first optical layer disposed on the light source side and a second optical layer disposed on the upper side of the first optical layer, and the first optical layer and the second optical layer may have different optical characteristics.

[0250] The first optical layer has a thickness variation structure, and the second optical layer may have a pattern density variation structure.

[0251] In addition, the first optical layer and the second optical layer may have different refractive indices.

[0252] Also, the size of the through holes changes depending on the distance from the light source, and the average diameter of the through holes closer to the light source may be smaller than the average diameter of the through holes farther from the light source. For example, the average diameter of the third through holes in the third region may be in the range of about 50㎛ to about 200㎛, and the average diameter of the first through holes in the first region may be in the range of about 10㎛ to about 80㎛.

[0253] In addition, the shape of the through holes includes at least one of a circular, elliptical, polygonal, and irregular shape, and the shape may change depending on the distance from the light source.

[0254] In another case, the optical member has a first pattern formed on a first surface facing the direction in which the light source is positioned, and a second pattern formed on a second surface facing the opposite direction in which the light source is positioned, and the first pattern and the second pattern may have different pattern density distributions.

[0255] The first pattern and the second pattern are arranged offset from each other to prevent a moiré pattern.

[0256] In another case, the optical member further includes a coating layer in which light transmittance is differentially controlled according to the distance from the light source, and the coating layer may have higher light diffusion characteristics in the region closer to the light source. As an example, the coating layer may include at least one of a diffusing agent, a phosphor, a quantum dot, a reflective particle, and an absorbing particle.

[0257] The thickness of the coating layer can decrease as it moves further away from the light source.

[0258] In another case, the thickness of the optical member changes in steps according to the distance from the light source and may include at least three thickness steps. Here, the boundary between each thickness step may be connected by a gently inclined surface or a curved surface.

[0259] In another case, the optical member may have a thickness variation area and a pattern density variation area alternately arranged in a concentric shape on a first surface facing the direction in which the light source is positioned. Here, the thickness variation area includes a curved surface or an inclined surface, and the pattern density variation area may have a plurality of through holes formed on a flat surface.

[0260] In another case, the optical member has light-diffusing particles dispersed therein, and the concentration of the light-diffusing particles may vary depending on the distance from the light source. Here, the concentration of the light-diffusing particles may be low in the region close to the light source and high in the region far from the light source. As an example, the light-diffusing particles may include at least one of TiO2, Al2O3, SiO2, ZnO, and ZrO2.

[0261] In another case, the through holes of the optical member have a straight, inclined, or curved path in the thickness direction of the optical member, and the path shape may change depending on the distance from the light source. For example, through holes in the area close to the light source may have a vertical path, and through holes in the area far from the light source may have an inclined path.

[0262] In another case, the partition may include an inner partition surrounding the light source and an outer partition surrounding the inner partition, and the optical member may also be disposed in the space between the inner partition and the outer partition. Here, the optical member disposed between the inner partition and the outer partition may have different optical characteristics from the optical member disposed above the light source.

[0263] In another case, the optical member includes a temperature compensation material whose optical properties change with temperature change, and can compensate for optical changes caused by heat generation in the light source. Here, the temperature compensation material may have the characteristic that light transmittance increases as the temperature rises.

[0264] In another case, the optical property change structure of the optical member has an asymmetric distribution centered on the light source and can selectively control light emission in a specific direction. Here, the asymmetric distribution can be determined according to the installation location of the lighting device and the required light distribution pattern.

[0265] In another case, the light source includes a plurality of light-emitting elements, and the optical characteristic change structure of the optical member may have optical characteristics individually optimized for each light-emitting element.

[0266] Multiple light-emitting elements emit light of different colors, and the optical property change structure of the optical member can provide differential light diffusion characteristics according to color.

[0267] In another case, the optical member may further include an alignment mark or alignment projection for positional alignment with respect to the partition wall. Here, the alignment mark or alignment projection may be formed in a non-patterned area of ​​the optical member.

[0268] In another case, at least one of an anti-fouling coating, a waterproof coating, or an anti-fogging coating may be formed on the outer surface of the optical member. Here, the coating may include a hydrophobic material, a hydrophilic material, or an amphiphilic material.

[0269] As another embodiment, the optical member may be formed as a multilayer structure having multiple refractive indices. Here, the optical member includes a first transparent layer and a second transparent layer having different refractive indices, wherein the first transparent layer is positioned close to the light source and the second transparent layer is positioned on the outside. Accordingly, light emitted from the light source is diffused first in the first transparent layer and second in the second transparent layer, so that the boundary between pixels becomes smoother and brightness uniformity can be improved.

[0270] As another embodiment, a micro pattern may be further formed on the first surface of the optical member. The micro pattern may include at least one of a lenticular pattern, a prism pattern, or a matte pattern. The micro pattern can minimize light loss while enhancing the pattern mask function by dispersing or selectively blocking the direction of light propagation.

[0271] As another embodiment, the optical member may be formed of a flexible material and applied to a curved substrate. Here, when the substrate is a flexible PCB, the optical member may also be formed of a silicone or urethane-based flexible resin to accommodate the bending of the substrate and provide uniform pixel illumination even on the curved exterior surface of a vehicle or irregular display areas.

[0272] As another embodiment, diffusion particles may be dispersed within the optical member. Here, the diffusion particles may be composed of multiple types with different average particle sizes, and diffusion particles with relatively small particle sizes may be disposed in the region adjacent to the light source, while diffusion particles with relatively large particle sizes may be disposed in the outer region. Accordingly, the hotspot phenomenon in the region adjacent to the light source can be suppressed more effectively.

[0273] As another embodiment, a reflective coating layer may be further formed on the upper surface of the partition. Here, the reflective coating layer may be formed as a metal thin film or a high-reflection resin layer, and can improve light utilization efficiency by re-reflecting light incident on the optical member.

[0274] FIG. 14 is a plan view of a vehicle with a lighting device applied according to an embodiment, FIG. 15 is a drawing showing an example of a taillight and indicator lamp of the vehicle of FIG. 14, and FIG. 16 is an example of a symbol or character of an indicator lamp being displayed by the lighting device of FIG. 15.

[0275] Referring to FIGS. 14 and 15, the front lamp (2) of the moving body or vehicle (1) 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 normal headlight but also additional functions such as a welcome light or a celebration effect when the driver opens the vehicle door.

[0276] The lamps can be applied to daytime running lights, high beams, low beams, fog lights, or turn signals.

[0277] And, the taillight (2) in the vehicle (1) may have a plurality of lamp units, and the lamp units may be provided as taillights, brake lights, reverse lights and turn signal lamps, etc.

[0278] The lighting device (1000) may be positioned on one side or the other side relative to the taillight (2) of the vehicle (1), positioned on the upper or lower side, or installed in a part of the rear of the vehicle.

[0279] The lighting device (1000) can be installed on the side of the vehicle or inside the vehicle.

[0280] Such a lighting device (1000) displays an image or information such as a symbol, logo, symbol or character by means of a plurality of pixel areas and is provided as a lighting module or display lamp.

[0281] That is, as shown in (a) and (b) of Fig. 16, it can be displayed as an exclamation mark such as ! or as a character such as STOP that can be recognized by other drivers.

[0282] Such a lighting device (1000) can provide uniform light by placing an optical member on top of a light source. Here, the optical member may have a first thickness in an area closer to the light source than a second thickness in an area farther from the light source. For example, the optical member may have a convex curved shape, a concave curved shape, or an inclined surface formed in an area facing between the light source and the partition wall.

[0283] Accordingly, the optical member of the lighting device (1000) can provide pixel lighting with high light uniformity and brightness by simultaneously performing a diffuser function and a pattern mask function.

[0284] The lighting device (1000) can be closely coupled to the surface of the housing or bracket of the vehicle and can be covered by a cover lens.

[0285] Additionally, the lighting device (1000) can be applied to a headlight or taillight to function as a headlight or taillight, or display an image or information in the headlight or taillight.

[0286] In this way, the lighting device according to the embodiment can provide pixel lighting with high light uniformity and brightness by arranging an optical member having a thickness greater in the region closer to the light source than in the region farther from the light source to simultaneously perform diffuser and pattern mask functions, and can improve assembly and cost competitiveness by minimizing manufacturing and assembly processes.

[0287] 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 only one embodiment. Furthermore, the features, structures, effects, etc. exemplified in each embodiment may be combined or modified and implemented in other embodiments by a person skilled in the art to which the embodiments belong. Therefore, details regarding such combinations and modifications should be interpreted as being included within the scope of the present invention.

[0288] Furthermore, although the invention has been described above with reference to embodiments, this is merely illustrative and does not limit the invention. Those skilled in the art will understand that various modifications and applications not exemplified above are possible within the scope of the essential characteristics of the embodiments. For example, each component specifically shown in the embodiments may be modified and implemented. Differences related to such modifications and applications should be interpreted as being included within the scope of the invention as defined in the appended claims.

Claims

1. Substrate; A light source portion disposed on the above substrate; A partition wall disposed around the light source unit; and, It includes an optical member positioned on the upper part of the light source unit, and The above optical member is, It has an optical characteristic change structure for uniformly diffusing light from the above light source, and The above optical property change structure is, A lighting device in which light transmission characteristics are differentially adjusted according to the distance from the light source.

2. In Paragraph 1, The above optical property change structure is, A lighting device comprising a thickness change structure in which the first thickness of the region closer to the light source is thicker than the second thickness of the region farther from the light source.

3. In Paragraph 2, The above optical member is, It includes a first surface facing the direction in which the light source is arranged and a second surface facing the opposite direction in which the light source is arranged, The first surface of the optical member is, It includes at least two combinations of curved surfaces, inclined surfaces, and flat surfaces, and The second surface of the above optical member is, A lighting device including a flat surface.

4. In Paragraph 3, The first surface of the optical member is, A curved surface is formed in the area facing the light source and the partition wall, and The above curved surface is a lighting device having any one of a convex curved surface shape, a concave curved surface shape, and a composite curved surface shape.

5. In Paragraph 3, The first surface of the optical member is, A lighting device having a first flat surface formed in a central area facing the upper surface of the light source, a curved or inclined surface formed in an intermediate area facing between the light source and the partition, and a second flat surface formed in an outer area facing the partition.

6. In Paragraph 1, The above optical property change structure is, A lighting device comprising a pattern in which a plurality of through holes are formed, and a pattern density change structure in which the pattern density in an area close to the light source is lower than the pattern density in an area far from the light source.

7. In Paragraph 6, The above optical member is, It includes a pattern area where the above pattern is formed and a non-pattern area surrounding the above pattern area, and The above pattern area is, A first region that overlaps vertically with the light source portion; A second region surrounding the first region; and, A lighting device comprising a third region surrounding the second region.

8. In Paragraph 7, The above through hole is, A plurality of first through holes formed in the first region; A plurality of second through holes formed in the second region above; and, It includes a plurality of third through holes formed in the above third region, and The number of the first through holes per unit area is less than the number of the second through holes per unit area, A lighting device in which the number of the second through holes per unit area is less than the number of the third through holes per unit area.

9. In Paragraph 1, The above optical property change structure is, A lighting device that simultaneously includes a thickness variation structure and a pattern density variation structure.

10. In a display lamp comprising at least one lighting device, At least one lighting device that provides uniform light by arranging an optical member on top of a light source; and, It includes a cover lens that covers the above lighting device, and The above lighting device is, Substrate; A light source portion disposed on the above substrate; A partition wall disposed around the light source unit; and, It includes an optical member positioned on the upper part of the light source unit, and The above optical member is, It has an optical characteristic change structure for uniformly diffusing light from the above light source, and The above optical property change structure is, An indicator lamp in which light transmission characteristics are differentially adjusted according to the distance from the light source.

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