Lighting devices and vehicle lamps

Abstract

summary The lighting device disclosed in the embodiments of the invention includes a substrate, a resin layer disposed on the substrate, a plurality of light-emitting elements sealed within the resin layer and electrically connected to the substrate, an optical film disposed on the resin layer, a plurality of light-shielding members disposed on the lower surface of the optical film and at least a portion of which overlaps each of the plurality of light-emitting elements perpendicularly, and an adhesive layer disposed between the optical film and the resin layer, wherein the adhesive layer includes a plurality of aperture regions on which each of the plurality of light-shielding members is disposed, each of the plurality of light-emitting elements includes a light-emitting surface that emits light to one side, each of the plurality of light-shielding members includes a plurality of light-shielding patterns and air gaps disposed between and outside the plurality of light-shielding patterns, the upper surface area of ​​the air gaps is in the range of 0.9 to 1.1 times the upper surface area of ​​the light-shielding patterns, and the light uniformity on the optical film can be 80% or more.

Description

[Technical Field]

[0001] Embodiments of the invention relate to lighting devices and vehicle lamps. [Background technology]

[0002] Lighting applications include not only vehicle lighting but also backlights for displays and signs. Light-emitting elements, such as light-emitting diodes (LEDs), have advantages over existing light sources such as fluorescent lamps and incandescent lamps, including low power consumption, semi-permanent lifespan, fast response speed, safety, and environmental friendliness. These light-emitting diodes are applied to various lighting devices, such as various display devices, indoor lights, and outdoor lights.

[0003] Recently, lamps employing light-emitting diodes (LEDs) have been proposed as light sources for vehicles. Compared to incandescent lamps, LEDs have the advantage of lower power consumption. However, because the emission angle of light emitted from LEDs is small, there is a need to increase the light-emitting area of ​​LED-based lamps when using LEDs as vehicle lamps. The small size of the LEDs allows for greater design flexibility in lamps, and their semi-permanent lifespan makes them economical. [Overview of the project] [Problems that the invention aims to solve]

[0004] Embodiments of the invention can provide an illumination device for providing a uniform distribution of surface light.

[0005] One embodiment of the invention can provide a lighting device having a uniform distribution of surface light by optimizing the area of ​​the light-shielding pattern of the light-shielding member and the area of ​​the opening region in which the light-shielding member is arranged.

[0006] Embodiments of the invention can provide a lighting device having a uniform distribution of surface light by optimizing the area of ​​the light-emitting element, the area of ​​the light-shielding pattern, and the area of ​​the air gap. [Means for solving the problem]

[0007] An embodiment of the invention includes a substrate, a resin layer disposed on the substrate, a plurality of light-emitting elements sealed within the resin layer and electrically connected to the substrate, an optical film disposed on the resin layer, a plurality of light-shielding members disposed on the lower surface of the optical film and at least a portion of which overlaps each of the plurality of light-emitting elements perpendicularly, and an adhesive layer disposed between the optical film and the resin layer, wherein the adhesive layer includes a plurality of aperture regions on which each of the plurality of light-shielding members is disposed, each of the plurality of light-emitting elements includes a light-emitting surface that emits light to one side, each of the plurality of light-shielding members includes a plurality of light-shielding patterns and air gaps disposed between and outside the plurality of light-shielding patterns, the upper surface area of ​​the air gaps is in the range of 0.9 to 1.1 times the upper surface area of ​​the light-shielding patterns, and the light uniformity on the optical film can be 80% or more.

[0008] According to an embodiment of the invention, the upper surface area of ​​the air gap within each light-shielding member can be in the range of 0.9 to 1.1 times the upper surface area of ​​the light-shielding pattern.

[0009] According to an embodiment of the invention, the outer pattern of the light-shielding pattern is positioned outside the opening region and can come into contact with the adhesive layer.

[0010] According to an embodiment of the invention, the light-shielding pattern can come into contact with the contact layer along the outer boundary line of the opening region.

[0011] According to an embodiment of the invention, the light-shielding pattern positioned outside the opening region can have the thinnest thickness of the light-shielding pattern.

[0012] According to an embodiment of the invention, in each of the plurality of opening regions, the upper surface area of ​​the air gap can be in the range of 1 to 1.1 times the upper surface area of ​​the light-shielding pattern.

[0013] According to an embodiment of the invention, the outer pattern of the light-shielding pattern is positioned inside the opening region of the adhesive layer.

[0014] According to an embodiment of the invention, the contact area between the outer pattern of the plurality of light-shielding patterns and the adhesive layer can be 3% or less along the boundary line of the opening region.

[0015] According to an embodiment of the invention, the plurality of light-shielding patterns can be separated from the upper surface of the resin layer.

[0016] According to an embodiment of the invention, the upper surface area of ​​each of the plurality of light-shielding members can be in the range of 6 to 10 times the upper surface area of ​​each of the plurality of light-emitting elements.

[0017] A vehicle lamp according to an embodiment of the invention includes a lamp having the lighting device disclosed above, the lamp may include at least one of the following: side mirror lamps, position lamps, fog lamps, taillights, brake lights, daytime running lights, interior vehicle lighting, door scuffs, rear combination lamps, and backup lamps. [Effects of the Invention]

[0018] According to embodiments of the invention, the lighting device and lamp can improve light uniformity. Specifically, a light-shielding member placed on the resin layer prevents hot spots emitted from the light-emitting element, thereby achieving a uniform light distribution.

[0019] According to embodiments of the invention, the pitch between light-emitting elements and the area of ​​the light-shielding member can be optimized to achieve a uniform distribution of surface light, thereby improving light uniformity and light-shielding effect.

[0020] According to embodiments of the invention, the reliability of a lighting device or vehicle lamp having a resin layer covering a light-emitting element molded with a light-emitting chip, and a light-shielding pattern on the resin layer, can be improved. [Brief explanation of the drawing]

[0021] [Figure 1] FIG. 1 is an example of a plan view of a lighting device according to an embodiment of the invention. [Figure 2] FIG. 2 is an example showing a partially enlarged view of the lighting device of FIG. 1. [Figure 3] FIG. 3 is an example of a cross-sectional view taken along the line A-A of the lighting device of FIG. 1. [Figure 4] FIG. 4 is a partially enlarged view of the lighting device of FIG. 3. [Figure 5] FIG. 5 is a drawing comparing the areas of air layers in terms of shape due to changes in the area of a light-shielding member in a lighting device according to an embodiment of the invention. [Figure 6] FIG. 6 is a graph showing the light efficiency and light uniformity according to the area ratio of the light-shielding member to the air layer of FIG. 5. [Figure 7] FIG. 7 is a drawing showing a lamp having a lighting device according to an embodiment of the invention. [Figure 8] FIG. 8 is a plan view of a vehicle to which the vehicle lamp of FIG. 7 is applied.

MODE FOR CARRYING OUT THE INVENTION

[0022] Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings.

[0023] The technical concept of the present invention is not limited to the embodiments described, but can be embodied in a variety of different forms, and within the scope of the technical concept of the present invention, one or more components between embodiments can be selectively combined and substituted. Furthermore, unless otherwise clearly defined, terms used in the embodiments of the present invention (including technical and scientific terms) can be interpreted as meanings generally understood by a person with ordinary skill in the art to which the present invention belongs, and commonly used terms, such as those defined in dictionaries, can be interpreted considering their meaning in the context of the technology in question. In addition, the terms used in the embodiments of the present invention are for illustrative purposes only and are not intended to limit the present invention. In this specification, singular forms can also include plural forms unless otherwise specifically limited in the description, and when it is written as "at least one (or more) of A and B, C", it can include one or more of all possible combinations of A, B, and C. Furthermore, terms such as 1st, 2nd, A, B, (a), (b), etc. can be used in the description of the components of the embodiments of the present invention. Such terminology is used to distinguish one component from another, and does not determine the nature or order of the component. When it is stated that a component is "connected," "joined," or "connected" to another component, this can include not only cases where the component is directly connected, joined, or connected to the other component, but also cases where it is "connected," "joined," or "connected" by another component between it and the other component. Furthermore, when it is stated that a component is formed or positioned "above or below" each component, "above" or "below" can include 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 positioned between the two components. Also, when expressed as "above or below," it can include not only the upward direction relative to one component, but also the downward direction.

[0024] The lighting device according to this invention is applicable to a variety of lamp devices that require lighting, such as vehicle lamps, household lighting devices, or industrial lighting devices. For example, when applied to vehicle lamps, it can be used for headlamps, side mirror lights, side marker lights, fog lamps, taillights, brake lights, daytime running lights, vehicle interior lighting, door scuffs, rear combination lamps, backup lamps, etc. The lighting device of this invention is also applicable to indoor and outdoor advertising devices, display devices, and various electric vehicle fields, and can be said to be applicable to all fields related to lighting that are currently under development and commercialized, or that can be realized through future technological advancements, as well as fields related to advertising.

[0025] Figure 1 is an example of a plan view of a lighting device according to an embodiment of the invention, Figure 2 is an example of a partially enlarged view of the lighting device in Figure 1, Figure 3 is an example of a cross-sectional view of the lighting device in Figure 1 on side AA, Figure 4 is a partially enlarged view of the lighting device in Figure 3, Figure 5 is a drawing comparing the area of ​​the air layer by shape due to the change in the area of ​​the light-shielding member in a lighting device according to an embodiment of the invention, and Figure 6 is a graph showing the light efficiency and light uniformity according to the area ratio of the air layer to the area of ​​the light-shielding member in Figure 5.

[0026] Referring to Figures 1 to 4, the lighting device 400 according to an embodiment of the invention may include a substrate 401, a plurality of light-emitting elements 100, a resin layer 420, a plurality of light-shielding members 450, and an optical film 430. The optical plate may include the optical film 430 and the plurality of light-shielding members 450, and the light-shielding members 450 may be formed on the upper or lower surface of the optical film 430. The lighting device 400 may be defined as a lighting module or a light-emitting module.

[0027] The lighting device 400 may include a reflective member 410 disposed between the substrate 401 and the resin layer 420. The lighting device 400 can emit light from the plurality of light-emitting elements 100 as surface light. The lighting device 400 may be defined as a light-emitting cell or a light source module. The lighting device 400 may include one or more light-emitting cells on the substrate 401. Here, the lighting device 400 may include first and second sides S1, S2 which are on both sides in the second direction Y, and third and fourth sides S3, S4 which are on both sides in the first direction X. The first and second sides S1, S2 may face each other and may be both sides of the substrate 401 and the resin layer 420. The third and fourth sides S3, S4 may face each other and may be the other two sides of the substrate 401 and the resin layer 420. The resin layer 420 covers the multiple light-emitting elements 100, guides the light emitted from each light-emitting element 100, and allows the guided light to be emitted in a surface light form through the upper surface. The resin layer 420 can be made by removing a light guide plate made of transparent acrylic (e.g., PMMA) and using a resin material such as silicone or epoxy with a thin thickness as the light guide member.

[0028] The substrate 401 may include a printed circuit board (PCB). The substrate 410 may include at least one of the following: a resin-based printed circuit board (PCB), a PCB with a metal core, a flexible material PCB, a ceramic material PCB, or an FR-4 substrate. If the substrate 401 is a metal core PCB with a metal layer on its bottom surface, the heat dissipation efficiency of the light-emitting element 100 can be improved. The substrate 401 is electrically connected to the plurality of light-emitting elements 100. The substrate 401 includes a wiring layer (not shown) on top, and the wiring layer is electrically connected to the plurality of light-emitting elements 100. The plurality of light-emitting elements 100 may be connected in series, parallel, or series-parallel by the wiring layer. The substrate 401 can function as a base member or support member located below the plurality of light-emitting elements 100 and the resin layer 420. The substrate 401 may be made of a transparent material or an opaque material. If the substrate 401 is made of a transparent material, the light emitted from the light-emitting element 100 is extracted to the lower part of the substrate 401. The substrate 401 may include an insulating layer (not shown) covering the wiring layer, and the insulating layer may be white, in which case a reflective function can be realized without a reflective member 410.

[0029] The upper surface of the substrate 401 may be a flat plane or a curved surface. The thickness of the substrate 401 may be the height in the vertical direction or the Z direction. Depending on the shape of the lamp or lighting device 400, the substrate 401 may be a bar shape that is long in one direction, a polygon shape, or a curved shape. The substrate 401 may have a longer length in the first direction X from which light is emitted, or a longer length in the second direction Y perpendicular to the direction from which light is emitted. In the drawing, the X direction may be the first direction, the Y direction may be the second direction, and the Z direction may be perpendicular to the first and second directions. The length of the substrate 401 in the first direction X may be greater than or less than the width in the second direction Y. Also, the sides of the substrate 401 in the direction of the long axis (e.g., S1, S2) may be a flat plane or a curved surface. The substrate 401 may include, for example, a reflective member 410. The reflective member 410 may be an insulating layer protecting a circuit pattern having pads arranged on the substrate 401, or a layer of reflective material.

[0030] The plurality of light-emitting elements 100 are arranged on the substrate 401 and emit light in a first direction X. The plurality of light-emitting elements 100 may be arranged in one or two rows. The light-emitting elements 100 are arranged on the substrate 401 in an M × N matrix, where M and N may be integers of 2 or more. The plurality of light-emitting elements 100 can emit light in any one direction or in directions opposite to each other. As another example, each of the plurality of light-emitting elements 100 can emit light in a second direction Y. At least one of the plurality of light-emitting elements 100 can emit light in a direction between the first and second directions. As yet another example, the plurality of light-emitting elements 100 are arranged along both sides S3 and S4 of the substrate 401 and can emit light toward opposite sides S3 and S4. Here, the plurality of light-emitting elements 100 may be arranged along both sides S3 and S4 of the substrate 401 so as to be offset from each other without facing each other.

[0031] The light-emitting element 100 may have an emission surface 81 on one side (e.g., S4) that emits light with the highest light intensity, and the emission surface 81 may extend, for example, in a third direction Z or perpendicular to the horizontal upper surface of the substrate 401. The emission surface 81 may be a vertical plane, or it may be a concave or convex surface. The light-emitting element 100 may include at least one light-emitting chip. Each of the light-emitting elements 100 may be a package having a plurality of light-emitting chips 71, 72, or a package in which at least one light-emitting chip is packaged. The light-emitting chips 71, 72 are molded by a molding member 80. The light-emitting chips 71, 72 may be arranged in a plurality in a direction Y perpendicular to a first direction X, and may include, for example, a first light-emitting chip 71 and a second light-emitting chip 72 spaced apart from each other.

[0032] Each of the emission surfaces 81 of the light-emitting element 100 may be the outer surface of the molding member 80. The molding member 80 may be made of a transparent resin material such as silicone or epoxy. The light-emitting chips 71 and 72 can emit at least one of blue, red, green, ultraviolet (UV), and infrared light, and each of the light-emitting elements 100 can emit at least one of white, blue, red, green, and infrared light. The first and second light-emitting chips 71 and 72 may emit the same color or different colors from each other. The material of the molding member 80 may be the same as or different from the material of the resin layer 420.

[0033] The light-emitting element 100 may be a side-view type in which its bottom portion is electrically connected to the substrate 401, and is not limited thereto. As another example, the light-emitting element 100 may be an LED chip or a top-view package. The emission surface 81 of the light-emitting element 100 is located on at least one side surface other than the top surface of the light-emitting element 100. The emission surface 81 may be the side surface of the light-emitting element 100 adjacent to the substrate 401, or a side surface perpendicular to the top surface of the substrate 401. The emission surface 81 is located on the side surface between the bottom surface and the top surface of the light-emitting element 100 and emits the light with the highest intensity in the first direction. The emission surface 81 of the light-emitting element 100 may be the surface adjacent to the reflective member 410, or a surface perpendicular to the top surface of the substrate 401 or the top surface of the reflective member 410. The area of ​​the emission surface 81 of each light-emitting element 100 may be 120% or less of the upper surface area of ​​the light-emitting element 100, for example, in the range of 80% to 120% or 80% to 100%. The area of ​​the emission surface 81 of each light-emitting element 100 may be in the range of 90% ± 10% of the upper surface area of ​​the light-emitting element 100.

[0034] A portion of the light emitted through the emission surface 81 of the light-emitting element 100 can travel in a direction parallel to the upper surface of the substrate 401, be reflected by the reflective member 410, or travel towards the upper surface of the resin layer 420. The thickness of the light-emitting element 100 can be, for example, 3 mm or less, and in the range of 0.4 mm to 3 mm. The length of the light-emitting element 100 in the second direction (D1 in Figure 2) can be 1.5 times or more the thickness of the light-emitting element 100. In such a light-emitting element 100, the light distribution emitted in the first direction X has a wider optical directional angle in the ±Y direction than the optical directional angle in the ±Z direction. The optical directional angle of the light-emitting element 100 in the second direction can be 110 degrees or more, for example, 120 to 160 degrees or 140 degrees or more. The optical directional angle of the light-emitting element 100 in the third direction can be 110 degrees or more, for example, in the range of 120 to 140 degrees.

[0035] The reflective member 410 may be a layer separately bonded to the upper part of the substrate 401, or a layer protecting the upper part of the substrate 401. The reflective member 410 is disposed, for example, between the substrate 401 and the resin layer 420. The reflective member 410 may be provided in film form. The reflective member 410 may be bonded to the upper surface of the substrate 401. The reflective member 410 may have an area smaller than the upper surface area of ​​the substrate 401. The reflective member 410 can be separated from the edge of the substrate 401, and the resin layer 420 is attached to the substrate 401 in the separated area. In this case, it is possible to prevent the edge portion of the reflective member 410 from peeling off.

[0036] The reflective member 410 may include a plurality of openings 417 into which the lower part of each light-emitting element 100 is positioned. The upper surface of the substrate 401 is exposed through the openings 417 of the reflective member 410, and the lower part of each light-emitting element 100 is electrically bonded. The size of each opening 417 is the same as or larger than the size of each light-emitting element 100. The reflective member 410 may be in contact with the upper surface of the substrate 401 or bonded between the resin layer 420 and the substrate 401. Here, the reflective member 410 may be removed if the upper surface of the substrate 401 is coated with a highly reflective material.

[0037] The reflective member 410 may be formed with a thickness thinner than the thickness of the light-emitting element 100. The thickness of the reflective member 410 can be in the range of 0.2 mm ± 0.02 mm. The lower part of the light-emitting element 100 can pass through the opening 417 of such a reflective member 410, and the upper part of the light-emitting element 100 can protrude. The emission surface 81 of each light-emitting element 100 may be provided in a direction perpendicular to the upper surface of the reflective member 410.

[0038] The reflective member 410 may be made of a metallic or non-metallic material. The metallic material may be a metal such as aluminum, silver, or gold. The non-metallic material may be a plastic or resin material. The resin material may have a reflective material, such as a metal oxide such as TiO2, Al2O3, or SiO2, added to silicone or epoxy. The reflective member 410 may be embodied in a single layer or a multilayer structure, and such a layer structure can improve the light reflection efficiency. The reflective member 410 according to the embodiment of the invention can increase the amount of light by reflecting incident light so that the light is emitted with a uniform distribution.

[0039] The resin layer 420 is disposed on the substrate 401. The resin layer 420 can face the substrate 401. The resin layer 420 may be bonded to the upper surface of the substrate 401 or to the upper surface of the reflective member 410. The resin layer 420 may be disposed on the entire upper surface or a portion thereof of the substrate 401. The lower surface area of ​​the resin layer 420 may be the same as or smaller than the upper surface area of ​​the substrate 401. The resin layer 420 is made of a transparent material and can guide or diffuse light. The resin layer 420 contains a UV-curable resin material and can be used in place of a light guide plate, and convenient effects include the ability to adjust the refractive index and thickness.

[0040] The resin layer 420 is provided as a light-guiding layer in resin, and therefore may be provided with a thinner thickness than in the case of glass, and may be provided as a flexible plate. The resin layer 420 can emit point light emitted from each light-emitting element 100 in the form of ray light or surface light. The resin layer 420 may contain beads (not shown), which can increase the amount of light by diffusing and reflecting incident light. The beads may be arranged in a range of 0.01 to 0.3% by weight of the resin layer 420. The beads may consist of any one selected from silicone, silica, glass bubble, PMMA (polymethyl methacrylate), urethane, Zn, Zr, Al2O3, and acrylic, and the particle size of the beads may be in the range of about 1 μm to about 20 μm, but is not limited thereto.

[0041] The thickness of the resin layer 420 can be 1.8 mm or more, for example, in the range of 1.8 mm to 2.5 mm. If the thickness of the resin layer 420 is greater than the range, the luminous intensity decreases, and it becomes difficult to provide a flexible module due to the increased module thickness. If the thickness of the resin layer 420 is less than the range, it becomes difficult to provide a surface light source with uniform luminous intensity. The resin layer 420 seals around each of the plurality of light-emitting elements 100, so that each light-emitting element 100 can be protected and the loss of light emitted from each light-emitting element 100 can be reduced. The upper part of each light-emitting element 100 may be embedded in the lower part of the resin layer 420. The resin layer 420 can be in contact with the surface of each light-emitting element 100 (e.g., multiple side and top surfaces) and can be in contact with the emission surface 81 of each light-emitting element 100. A portion of the resin layer 420 may be placed in the opening 417 of the reflective member 410.

[0042] The adhesive layer 415 may be an adhesive material such as silicone or epoxy, or it may include a diffusion material. The diffusion material may include at least one of polyester (PET), PMMA (Poly Methyl Methacrylate), or PC (Poly Carbonate). The adhesive layer 415 may be a transparent resin material. The adhesive layer 415 may be bonded to the upper surface of the resin layer 420. The adhesive layer 415 can allow the optical film 430 to adhere closely to the upper surface of the resin layer 420. The adhesive layer 415 may have a plurality of opening regions in which each of the plurality of light-shielding members 450 is positioned. The adhesive layer 415 may be bonded around the outside of each light-shielding member 450, the lower surface of the optical film 430, and the upper surface of the resin layer 420. The upper surface area of ​​the adhesive layer 415 within the upper surface of the resin layer 420 may be larger than the upper surface area of ​​the light-shielding member 450.

[0043] Each of the plurality of light-shielding members 450 may include a light-shielding pattern P1. Each of the plurality of light-shielding members 450 may include the light-shielding pattern P1 and an air gap G1 positioned around the light-shielding pattern P1. Each of the plurality of light-shielding members 450 may include the light-shielding pattern P1, the air gap G1, and an opening region 427. The air gap G1 and the opening region 427 can be defined as an air layer. The opening region 427 may be an area from which the adhesive layer 415 has been removed. Conversely, the opening region 427 may include the air gap G1. Since such an air layer region totally reflects light, it can function as a light-shielding member.

[0044] The plurality of light-shielding members 450 can face the upper surface of the resin layer 420. The plurality of light-shielding members 450 can overlap each of the light-emitting elements 100 in a perpendicular direction or in a third direction Z. A portion of each of the plurality of light-shielding members 450 can overlap each of the plurality of light-emitting elements 100 in a perpendicular direction. The plurality of light-shielding members 450 are arranged between the resin layer 420 and the optical film 430. The light-shielding members 450 may have a light-shielding pattern P1 and be formed on the lower surface of the optical film 430.

[0045] The optical film 430 may include a plurality of light-shielding members 450 having a light-shielding pattern P1 printed on its lower surface. When the light-shielding pattern P1 is printed on the lower surface of the optical film 430, the light-shielding effect due to the opening region 427 between the optical film 430 and the resin layer 420, and the light-shielding effect due to the air gap G1 between the light-shielding pattern P1 on the lower surface of the optical film 430 can be improved. Such a light-shielding effect can improve light diffusion efficiency and improve light uniformity. As another example, the light-shielding member 450 may have a light-shielding pattern P1 and be printed on the upper surface of the optical film 430. The light-shielding member 450 may have a light-shielding pattern and be formed on the upper surface of the resin layer 430. As yet another example, when a plurality of optical films 430 are arranged, the light-shielding members 450 may be arranged between the plurality of optical films and be formed on the upper surface of the lower optical film or on the lower surface of the upper optical film.

[0046] The light-shielding member 450 is positioned inside the adhesive layer 415 or between regions of the adhesive layer 415, i.e., in an opening region. The light-shielding member 450 can penetrate the adhesive layer 415 and can contact at least one of the resin layer 420 and the optical film 430. The light-shielding member 450 may or may not be in contact with the adhesive layer 415. The region inside the adhesive layer 415 and / or separated from the upper surface of the resin layer 420 can be defined as an opening region 427. The opening region 427 can provide a refractive index different from that of the light-shielding member 450 and the adhesive layer 415, thereby improving light diffusion efficiency. The bottom surface of the light-shielding member 450 may be separated from or not in contact with the upper surface of a layer located below it, for example, the upper surface of the resin layer 420. The opening region 427 may be a vacuum region or a region without a pattern.

[0047] The light-shielding member 450 may include an air gap G1 which is an air region between the plurality of light-shielding patterns P1 and an air region outside the light-shielding patterns P1. The air gap G1 is a region between the light-shielding patterns P1 and may be connected to each other. At least a portion of the air gap G1 may be connected to the opening region 427.

[0048] The spacing B1 between adjacent light-shielding members 450 may be smaller than the spacing X1 between adjacent light-emitting elements 100. The spacing B1 between adjacent light-shielding members 450 may be larger than the spacing X2 between an adjacent light-shielding member 450 and a light-emitting element 100. The spacing X2 between an adjacent light-shielding member 450 and a light-emitting element 100 can be 1 mm or more, and may be smaller than the center length of the light-shielding member 450 in the first direction X. The ratio of the spacing X1 between adjacent light-emitting elements 100 to the spacing X2 between an adjacent light-shielding member 450 and a light-emitting element 100 can be in the range of 2.5:1 to 3.5:1. When such a ratio is satisfied, the light uniformity due to the light-shielding effect can be improved. Each light-shielding member 450 can be separated from the upper surface of the resin layer 420. The light-shielding member 450 can be separated from the outer surface of the adhesive layer 415. Multiple light-shielding members 450 have the same shape as each other and can overlap on top of each light-emitting element 100. Each of the light-shielding members 450 may be arranged on the resin layer 420 in a region perpendicular to each light-emitting element 100, in the emission-side region of each light-emitting element 100, and in both emission-side regions.

[0049] The light-shielding member 450 may be an area printed with a white material. The light-shielding member 450 may consist of a light-shielding material having at least one diffusing agent, such as TiO2, Al2O3, CaCO3, BaSO4, or Silicon, within the resin material. The light-shielding member 450 can reflect light emitted through the emission surface 81 of the light-emitting element 100, thereby reducing the occurrence of hot spots on the optical film 430 that overlaps the light-emitting element 100 perpendicularly. The light-shielding member 450 can have a light-shielding pattern P1 printed using the light-shielding material. The light-shielding member 450 may be formed in such a way that it is printed on the lower surface of the optical film 430. The light-shielding member 450 is made of a material that does not block 100% of incident light, has a transmittance lower than its reflectance, and can function to shield and diffuse light. The light-shielding member 450 may have a transmittance of less than 12%, for example, in the range of 6% to 11%. If the transmittance of the light-shielding member 450 is less than the range, dark areas may occur, and if it is greater than the range, the light uniformity may decrease.

[0050] The light-shielding member 450 may be formed in a single layer or multiple layers, and may have different pattern shapes depending on the region. The thickness of the light-shielding member 450 may have different thicknesses or heights depending on the region. The thickness of the light-shielding member 450 may be greatest in the region overlapping with the emission surface 81 of each light-emitting element 100, and the thickness may be greatest in the edge region. In the light-shielding member 450, the thickness of the region closer to the emission surface 81 may be greater, and the thickness of the region further from the emission surface 81 may be thinner, with the region overlapping with the emission surface 81 of the light-emitting element 100 as the reference.

[0051] The smallest pattern P1 of the light-shielding member 450 may be a polygonal shape such as a square, a circle, or an ellipse. The largest pattern P1 of the light-shielding member 450 may have an area larger than the upper surface area of ​​the light-emitting element 100. Here, the largest pattern may be the pattern layer having the thickest thickness among the light-shielding members 450. The light-shielding member 450 may be positioned higher than the upper surface of the resin layer 420. The lowest surface of the light-shielding member 450 may be positioned higher than the upper surface of the resin layer 420. The light-shielding member 450 may include at least two layers in terms of thickness or height relative to the optical film 430, and may include, for example, at least three layers.

[0052] The thickness of the light-shielding member 450 can be 35 μm or more, for example, in the range of 35 μm to 200 μm. If the thickness of the light-shielding member 450 is less than 35 μm, it may not be able to effectively block light incident from below the light-shielding member 450, or the transmittance may increase, resulting in an uneven light distribution on the light-shielding member 450. Also, if the thickness of the light-shielding member 450 exceeds 200 μm, although it is possible to effectively control the formation of hot spots by the light emitted from each of the light-emitting elements 100, the light emitted from each of the light-emitting elements 100 may be lost in the process of passing through the light-shielding member 450, resulting in a decrease in overall brightness. Therefore, it is preferable that the thickness of the light-shielding member 450 satisfies the above range.

[0053] The minimum thickness of the light-shielding member 450 is 35 μm or more, and can satisfy, for example, a range of 35 μm to 50 μm, preferably a range of 35 μm to 45 μm. If the minimum thickness of the light-shielding member 450 is smaller than the above range, it will fall outside the range of transmittance disclosed above, and the light uniformity may decrease. If it is larger than the above range, it will fall below the range of transmittance disclosed above, and dark areas may occur.

[0054] The maximum thickness of the light-shielding member 450 is 100 μm or more, and can satisfy, for example, 100 μm to 200 μm, preferably in the range of 110 μm to 150 μm or 110 μm to 130 μm. If the maximum thickness of the light-shielding member 450 is less than the above range, it may fall outside the range of transmittance disclosed above, and the light uniformity may decrease. If it is greater than the above range, it may fall below the range of transmittance disclosed above, and dark areas may occur. The light-shielding member 450 may include a region having an intermediate thickness (i.e., an intermediate layer). The thickness of the intermediate region is 70 μm or more, and can satisfy, for example, 70 μm to 140 μm, preferably in the range of 70 μm to 110 μm or 75 μm to 100 μm. If the thickness of the intermediate region of the light-shielding member 450 is smaller than the range, it may fall outside the range of transmittance disclosed above, and the light uniformity may decrease. If it is larger than the range, it may fall below the range of transmittance disclosed above, and dark areas may occur. The maximum thickness may be greater than the sum of the minimum thickness and the intermediate thickness.

[0055] As shown in Figure 4, the light-shielding member 450 may include a first light-shielding portion 451, a second light-shielding portion 452, and a third light-shielding portion 453. At least one or all of the first to third light-shielding portions 451, 452, and 453 may contain the light-shielding material. The first light-shielding portion 451 may have a minimum thickness, the second light-shielding portion 452 may have an intermediate thickness, and the third light-shielding portion 453 may have a maximum thickness. The upper surface area of ​​the first light-shielding portion 451 may be larger than the upper surface areas of the first and second light-shielding portions 451 and 452, respectively, and preferably larger than the sum of the upper surface areas of the first and second light-shielding portions 451 and 452. The uniformity of light due to shielding can be improved by the upper surface area of ​​such light-shielding portions 451, 452, and 453. The first to third light-shielding portions 451, 452, and 453 do not have to overlap each other in the vertical direction. The patterns of the first to third light-shielding portions 451, 452, and 453 may be formed without rounding at the upper corners or upper periphery. Such light-shielding members improve the uniformity of the patterns of each light-shielding portion, thereby improving brightness and luminous flux. The light-shielding member 450 may include light-shielding portions having different thicknesses in different regions. The light-shielding portions 451, 452, and 453 of the light-shielding member 450, having different thicknesses, may be made of the same material.

[0056] In the light-shielding member 450, the first light-shielding portion 451 may include a first region having a dense pattern on the light-emitting surface 81 of the light-emitting element 100, and a second region having a sparser pattern than the first region. The pattern of the first light-shielding portion 451 is arranged around the second and third light-shielding portions 452 and 453. The first region with the dense pattern covers the upper part of the light-emitting surface 81 of the light-emitting element 100, thereby improving the distribution of light traveling to the optical film 430 through the first light-shielding portion 451. The gap between the patterns of the first and second regions of the first light-shielding portion 451 can be gradually increased as the distance from the light-emitting surface 81 of the light-emitting element 100 increases, and the size of each pattern in the first region can be gradually decreased as the distance from the light-emitting surface 81 of the light-emitting element 100 increases. Both sides of the third light-shielding portion 453 may be in contact with or separated from the first light-shielding portion 451, and one side and the other side may be in contact with or separated from the second light-shielding portion 452. The outer surface of the second light-shielding portion 452 may be in contact with or separated from the first and third light-shielding portions 451 and 453. The light-emitting surface 81 of the light-emitting element 100 can overlap the second and third light-shielding portions 452 and 453 in a perpendicular direction. The light-emitting surface 81 of the light-emitting element 100 can overlap the light-shielding pattern P1 in a perpendicular direction. Since the luminous intensity of light traveling on both sides in the second direction Y with respect to the light-emitting element 100 is 50% or more less than the luminous intensity in the first direction X, a decrease in light-shielding efficiency can be prevented even if the lengths of the second light-shielding portion 452 and the third light-shielding portion 453 in the second direction Y are set to be the same.

[0057] As shown in Figures 1 and 2, when viewed from a top view of the light-shielding member 450, the upper surface area of ​​the region formed by the boundary line R1 connecting the outer edges of the light-shielding pattern P1 can be five times or more the upper surface area of ​​the light-emitting element 100, for example, in the range of 5 to 12 times or 6 to 10 times. The maximum area of ​​the region formed by the boundary line R1 connecting the outer edge patterns of the light-shielding member 450 may be the upper surface area of ​​the light-shielding member 450. The upper surface area of ​​the light-shielding member 450 may be the area of ​​the region connecting the outer edges of the uppermost pattern. The pitch between the light-emitting elements in this case can be 15 mm or more, for example, in the range of 15 mm to 25 mm. Here, the boundary line R1 may be the boundary line between the light-shielding pattern P1 and the adhesive layer 415. The boundary line R1 may be the boundary line between the air gap G1 between the light-shielding pattern P1 and the adhesive layer 415. The boundary line R1 may be the outer edge line of the opening region 427 of the adhesive layer 415.

[0058] The lower surface area of ​​the light-shielding member 450 may be the area of ​​the region connecting the outer edges of the pattern of the third light-shielding portion 453, or it may be the minimum area. The lower surface area of ​​each light-shielding member 450 can be at least one times the upper surface area of ​​each light-emitting element 100, for example, in the range of 1 to 2.5 times or 1.5 to 2.5 times. This reduces the problem of the light-emitting elements 100 being visible from the outside, reduces hot spots on the area of ​​the light-emitting elements 100, and provides a uniform light distribution across the entire area.

[0059] Each of the plurality of light-shielding members 450 may include a first edge 461, a second edge 462, and a third edge 463 along the outer region of pattern P1. The first edge 461 is at least a portion of a region adjacent to or perpendicularly overlapping each of the light-emitting elements 100, the third edge 463 is the region opposite to the first edge 461, and the second edge 462 may have a biconvex shape as both side lines in the second direction Y of each light-shielding member 450. The first edge 461 has a virtual linear shape, and the third edge 463 has a virtual linear shape and may have a linear length longer than the linear length of the first edge 461. In front of the third edge 463 are projecting patterns 465, 466 that project forward, and the projecting patterns 465, 466 can face the light-emitting chips 71, 72 of the light-emitting elements 100 in a horizontal plan view, and can reduce the intensity of light emitted from each light-emitting chip 71, 72.

[0060] The convex shape of the second edge 462 of the light-shielding member 430 can protrude outward or toward the second side surface S3 in the region between one end of the first edge 461 and one end of the third edge 463, and can protrude outward or toward the first side surface S1 in the region between the other end of the first edge 461 and the other end of the third edge 463. The second-direction length of the first edge 461 of the light-shielding member 450 is set to be 0.8 mm or more greater than the length D1 of the light-emitting element 100, so that both sides of the emission surface of the light-emitting element 100 can be covered, and hot spots caused by light emitted from the light-emitting element 100 can be prevented. The ratio of the length D1 of the light-emitting element 100 to the length C3 of the light-shielding member 450 can satisfy the following conditions.

[0061] TIFF2026510003000002.tif10156 When the above conditions are met, the light uniformity around the light-shielding member 450 can be improved. If the range is smaller than the above range, hot spots may occur or the light uniformity may decrease. If the range is larger than the above range, light loss or dark areas may occur.

[0062] The maximum length C3 of the light-shielding member 450 in the second direction Y varies depending on the length D1 of the light-emitting element 100 in the second direction Y. The maximum length C3 can be 9 mm or more, for example, in the range of 9 mm to 20 mm or 10 mm to 18 mm. The maximum length B3 of the light-shielding member 450 in the first direction X may be the same as or less than the maximum length C3 of the second direction Y. The maximum length B3 of the light-shielding member 450 in the first direction X can be 7 mm or more, for example, in the range of 7 mm to 13 mm. The length of the light-shielding member 450 can cover the top, front and both sides of the emission surface 81 of the light-emitting element 100, preventing hot spots caused by light emitted from the light-emitting element 100 and improving light uniformity.

[0063] The adhesive layer 415 can be in contact with the outer surface of the light-shielding member 450 or separated by a distance of less than 1 mm. The straight line K1 perpendicular to the rear surface of the light-emitting element 100 does not have to overlap with the light-shielding member 450. The straight line K2 perpendicular to the front surface (or emission surface) of the light-emitting element 100 can overlap with the light-shielding member 450 or with the region having the maximum thickness of the light-shielding member 450. The ratio between the length D2 of the light-emitting element 100 in the first direction X and the maximum length B3 of the light-shielding member 450 in the first direction X can satisfy the following conditions.

[0064] TIFF2026510003000003.tif10157When the above conditions are met, the light uniformity around the light-shielding member 450 can be improved.If the range is smaller than the above range, hot spots may occur or the light uniformity may decrease.If the range is larger than the above range, light loss or dark areas may occur.

[0065] In the embodiment of the invention, the light extraction efficiency and light uniformity can be optimized by the relationship between the area of ​​the light-shielding pattern P1 of the light-shielding member 450 and the area of ​​the air gap G1. For example, the upper surface area of ​​the air gap G1 is 1.1 times or less than the upper surface area of ​​the light-shielding pattern P1, for example, in the range of 0.9 to 1.1 times. When it is within this range, a decrease in the light efficiency of the lighting device can be prevented, and the light uniformity can be 80% or more. That is, a light uniformity of 80% or more is recognized as a uniform surface light source, and in the embodiment of the invention, when the upper surface area of ​​the air gap G1 is in the range of 0.9 to 1.1 times compared to the upper surface area of ​​the light-shielding pattern P1, the light uniformity of 80% or more can be achieved. Furthermore, if the ratio of the upper surface area of ​​the air gap G1 is smaller than the range, the light-shielding effect of the light-shielding pattern G1 may decrease, and if the area of ​​the air gap G1 exceeds the range, the adhesive area of ​​the light-shielding member 450 decreases, and the light distribution on the light-shielding member 450 becomes uneven. The upper surface area of ​​the air gap G1 and the upper surface area of ​​the light-shielding pattern P1 may be a ratio within each of the light-shielding members 450. The upper surface area of ​​the air gap G1 and the upper surface area of ​​the light-shielding pattern P1 may also be a ratio within each of the opening regions within the adhesive layer 415.

[0066] Referring to Figures 5 and 6, the area of ​​the light-shielding pattern P1 of each light-shielding member 450 is Ap1, and the area of ​​the air gap G1 within each light-shielding member is A G1 If A G1 When the ratio of / Ap1 is 80%, 90%, 100%, 110%, and 120%, the outer shape of the light-shielding pattern and the shape of the air gap can be shown as in Figure 5.

[0067] A G1When the ratio of / Ap1 is 80%, the light-shielding pattern P1 is positioned inside and outside the boundary line R1, and the air gap G1 is located inside the boundary line R1. When the area of ​​the air gap G1 is 80% of the area of ​​the light-shielding pattern P1, both the light-shielding pattern P1 and the air gap G1 are present inside the boundary line R1, and the light-shielding pattern P1 and the adhesive layer 415 are present outside the boundary line R1. The boundary line R1 is formed along the opening region 427 of the adhesive layer 415, and the adhesive layer 415 is positioned in the gap between the light-shielding patterns P1 and below the light-shielding patterns P1 in the region outside the boundary line R1.

[0068] The outer pattern of the light-shielding pattern P1 can be positioned inside the adhesive layer 415 outside the opening region 427 or can be in contact with the adhesive layer 415. The outer light-shielding pattern P1 positioned inside the adhesive layer 415 may be the pattern of the first light-shielding portion 451 shown in Figure 4. The adhesive layer 415 is positioned on the lower surface of the outer portion of the light-shielding pattern P1. The inner pattern of the light-shielding pattern P1 can be in non-contact with the adhesive layer 415 inside the opening region 427. The upper surface area of ​​the light-shielding pattern P1 can be in the range of 125% ± 3% of the upper surface area of ​​the air gap G1. The ratio of the areas in contact between the adhesive layer 415 and the light-shielding pattern P1 can be in the range of 20% ± 3% of the light-shielding pattern P1.

[0069] A G1When the ratio of / Ap1 is 90%, the light-shielding pattern P1 and air gap G1 are positioned inside the boundary line R1, and the light-shielding pattern P1 and adhesive layer 415 are positioned outside the boundary line R1. The gap between the light-shielding patterns P1 outside the boundary line R1 is filled with adhesive layer 415. The outer pattern of the light-shielding pattern P1 can be positioned inside the adhesive layer 415 or in contact with the adhesive layer 415 outside the opening region 427. The adhesive layer 415 is positioned on the lower surface of the outer pattern of the light-shielding pattern P1. The pattern of the light-shielding pattern P1 positioned inside the adhesive layer 415 may be the pattern of the first light-shielding portion 451 shown in Figure 4. The inner pattern of the light-shielding pattern P1 can not be in contact with the adhesive layer 415 inside the opening region 427.

[0070] The ratio of the area in contact between the adhesive layer 415 and the light-shielding pattern P1 can be in the range of 10% ± 3% of the light-shielding pattern P1. Here, the boundary line R1 is the boundary between the adhesive layer 415 and the air gap G1.

[0071] A G1 When the ratio of / Ap1 is 100%, the light-shielding pattern P1 and the air gap G1 are positioned inside the boundary line R1, and the adhesive layer 415 is positioned outside the boundary line R1. The adhesive layer 415 is positioned outside the boundary line R1 and along the outside of the light-shielding pattern P1. The ratio in which the adhesive layer 415 and the light-shielding pattern P1 are in contact with each other can be in the range of ±3% of the light-shielding pattern P1. Here, the boundary line R1 is the boundary between the adhesive layer 415 and the air gap G1 and the boundary between the light-shielding pattern P1 and the adhesive layer 415.

[0072] A G1When the ratio of / Ap1 is 110%, the light-shielding pattern P1 and the air gap G1 are arranged inside the boundary line R1, and the adhesive layer 415 is arranged outside the boundary line R1. The boundary line R1 is the boundary line between the outer edge of the air gap G1 and the adhesive layer 415. Here, the region between the air gap G1 and the boundary line R1 may be an opening region 427, and for the sake of explanation, it can be defined as the region of the air gap G1. Here, the boundary line R1 is the boundary between the adhesive layer 415 and the air gap G1 or the opening region 427. The boundary line R1 is the boundary between the adhesive layer 415 and the opening region of the adhesive layer 415.

[0073] The upper surface area of ​​the air gap G1 inside the boundary line R1 may be 10% ± 3% larger than the upper surface area of ​​the light-shielding pattern P1. The adhesive layer 415 is formed along the outer edge of the opening region 427, and the lower surface area of ​​the opening region 427 may be approximately 10% ± 3% larger than the upper surface area of ​​the light-shielding pattern P1. In such a structure, the contact area between the outside of the light-shielding pattern P1 and the adhesive layer 415 can be 3% or less relative to the boundary line, or they can be in contact or not in contact with each other. Since the outer part of the light-shielding pattern P1 is located inside the opening region 427 and inside the boundary line R1, the upper surface area of ​​the light-shielding pattern P1 can be 97% or less of the area of ​​the opening region 427, for example, in the range of 85% to 97%.

[0074] A G1When the ratio of / Ap1 is 120%, a light-shielding pattern P1 and an air gap G1 are arranged inside the boundary line R1, and an adhesive layer 415 is arranged outside the boundary line R1. The boundary line R1 is the boundary line between the outer contour line of the air gap G1 and the adhesive layer 415. Here, the region between the air gap G1 and the boundary line R1 may be an opening region 427 and can be defined as the region of the air gap G1 for convenience of explanation. The upper surface area of the air gap G1 inside the boundary line R1 may be 20% ± 3% larger than the upper surface area of the light-shielding pattern P1. The adhesive layer 415 is formed along the outer contour line of the opening region 427, and the lower surface area of the opening region 427 may be larger than the upper surface area of the light-shielding pattern P1 in the range of about 20% ± 3%.

[0075] Since the outer part of the light-shielding pattern P1 is arranged inside the inner part of the opening region 427 and inside the boundary line R1, the upper surface area of the light-shielding pattern P1 can have a range of 87% or less, for example, 75% - 87% compared to the area of the opening region 427. In such a structure, the contact area between the light-shielding pattern P1 and the adhesive layer 415 can be 2% or less based on the boundary line or they can be non-contact with each other. The boundary line R1 is the boundary between the adhesive layer 415 and the opening region 427. The boundary line R1 is the boundary between the adhesive layer 415 and the opening region of the adhesive layer 415.

[0076] In an embodiment of the invention, the upper surface area of the air gap in the adhesive layer can satisfy 90% - 110% compared to the ratio of the upper surface area of the light-shielding pattern. For example, A G1 When the ratio of / Ap1 is 90% - 100%, the upper surface area of the air gap G1 in each light-shielding member 450 can satisfy the range of 0.9 times to 1 times the upper surface area of the light-shielding pattern P1. A G1 When the ratio of / Ap1 is 100% - 110%, the upper surface area of the air gap G1 in each opening region of the adhesive layer 415 can satisfy the range of 1 times to 1.1 times the upper surface area of the light-shielding pattern P1.

[0077] Figure 6 shows an illumination device of an embodiment of the invention, A G1 This graph compares light efficiency and light uniformity when the ratio of / Ap1 ranges from 80% to 120%. G1 If the ratio of / Ap1 is 90% to 110%, the light uniformity is 80% or higher. G1 When the ratio of / Ap1 is 80% to 120%, the light efficiency is 94% or higher. Light efficiency is A G1 The ratio of / Ap1 is highest at 80%, and gradually decreases as it increases from 80% to 120%. G1 The light uniformity and light efficiency corresponding to the ratio of / Ap1 are shown in Table 1. [Table 1]

[0078] A G1 The ratio of / Ap1 is compared based on the opening area of ​​each light-shielding member or each adhesive layer, and A is calculated for the entire lower surface area of ​​the optical film. G1 The ratio of / Ap1 can be satisfied. Therefore, when the lighting device has a light uniformity of 80% or more that is recognized as a uniform surface light source, the ratio of the upper surface area of ​​the light-shielding pattern to the upper surface area of ​​the air gap in each light-shielding member can be in the range of 90% to 110%. The criterion for 100% of the light efficiency is set as the case when the upper surface area of ​​the light-shielding pattern and the upper surface area of ​​the air gap are the same, A G1 The light efficiency was measured according to the ratio of / Ap1.

[0079] Furthermore, as shown in Table 2, when the upper surface area of ​​the light-shielding member 450 is 6 to 10 times the upper surface area of ​​the light-emitting element 100, the light uniformity of the lighting device 400 can be obtained to be 80% or more. Also, when the upper surface area of ​​the light-shielding member 450 is 8 times the upper surface area of ​​the light-emitting element 100, the light uniformity of the lighting device 400 is higher than when it is 6 or 10 times. The pitch X1 between the light-emitting elements can be 15 mm or more, for example, in the range of 15 mm to 25 mm or 17 mm to 23 mm. For example, pitch A was measured at 18 mm ± 1 mm, pitch B at 20 mm ± 1 mm, and pitch C at 22 mm ± 1 mm. When the pitch between the light-emitting elements is A, B, or C, and the upper surface area of ​​the light-shielding member is 6 to 10 times the upper surface area of ​​the light-emitting element, the lighting device can be found to have a light uniformity of 80% or more. In this case, given the same area of ​​light-shielding members, it can be seen that when pitch A is greater than when pitch B, the light uniformity appears higher, and when pitch B is greater than when pitch C. Therefore, when the light uniformity recognized as a uniform surface light source of the lighting device is 80% or more, the upper surface area of ​​each light-shielding member can be in the range of 6 to 10 times the area of ​​each light-emitting element. [Table 2]

[0080] Furthermore, in order to achieve a light uniformity of 80% or more, the ratio between the pitch X1 between light-emitting elements and the distance X2 between adjacent light-shielding members 450 and light-emitting elements 100 can be set as follows: The distance X2 between adjacent light-shielding members 450 and light-emitting elements 100 can be in the range of 0.15 to 0.55 times the pitch X1 between the light-emitting elements. For example, if the upper surface area of ​​the light-shielding member 450 is 6 times the upper surface area of ​​the light-emitting element 100, the distance X2 between adjacent light-shielding members 450 and light-emitting elements 100 can be 0.45 times or more the pitch X1 between the light-emitting elements, for example, in the range of 0.45 to 0.55 times.

[0081] If the upper surface area of ​​the light-shielding member is eight times the upper surface area of ​​the light-emitting element, the distance X2 between adjacent light-shielding members 450 and light-emitting elements 100 can be 0.3 times or more the pitch X1 between the light-emitting elements 100, for example, in the range of 0.3 to 0.45 times. If the upper surface area of ​​the light-shielding member is ten times the upper surface area of ​​the light-emitting elements, the distance X2 between adjacent light-shielding members 450 and light-emitting elements 100 can be 0.35 times or less the pitch X1 between the light-emitting elements 100, for example, in the range of 0.15 to 0.35 times.

[0082] Table 3 shows that the light uniformity, based on the upper surface area of ​​the light-shielding member compared to the upper surface area of ​​the light-emitting element, the pitch X1 of the light-emitting elements, and the distance X2 (horizontal distance) between adjacent light-emitting elements and the light-shielding member, can be determined as follows. [Table 3]

[0083] The features described in Tables 2 and 3 may be combined with the configuration in Table 1. Therefore, by adjusting items such as the area of ​​the aperture region where the light-shielding member pattern is arranged, the upper surface area of ​​the light-shielding member, the pitch between the light-emitting elements, and the upper surface area of ​​the light-emitting elements, the light uniformity of the lighting device can be set to 80% or more.

[0084] The optical film 430 is placed on the resin layer 420. The lower surface of the optical film 430 has the adhesive layer 415 and the light-shielding member 450 placed on it. The optical film 430 has the light-shielding member 450 printed on its lower surface and is fixed onto the resin layer 420 via the adhesive layer 415. The optical film 430 may include at least one of polyester (PET) film, PMMA (Poly Methyl Methacrylate) material, or PC (Poly Carbonate). The optical film 430 may be provided as a film of a resin material such as silicone or epoxy. The optical film 430 may include a single layer or a multilayer. As another example, if a lower optical film (not shown) is placed between the adhesive layer 415 and the resin layer 420, the lower optical film may be bonded to the resin layer 420 by a first adhesive force having fine cilia on the upper surface of the resin layer 420. At this time, the optical film 430 and / or the lower optical film can be attached to the resin layer 420 by applying a predetermined pressure or pressure / heat.

[0085] The thickness of the optical film 430 is 25 μm or more, and can be in the range of 25 μm to 250 μm or 100 μm to 250 μm. Such an optical film 430 has the aforementioned thickness range and can provide incident light as a uniform surface light source. The optical film 430 and / or the lower optical film may contain at least one or more of the following: a diffusing agent such as beads, a phosphor, and ink particles. The phosphor may include at least one of the following: a red phosphor, an amber phosphor, a yellow phosphor, a green phosphor, or a white phosphor. The ink particles may include at least one of the following: a metallic ink, a UV ink, or a curing ink. The size of the ink particles may be smaller than the size of the phosphor. The surface color of the ink particles may be any one of green, red, yellow, or blue. The ink type can be selectively applied from PVC (Poly vinyl chloride) ink, PC (Polycarbonate) ink, ABS (acrylonitrile butadiene styrene copolymer) ink, UV resin ink, epoxy ink, silicone ink, PP (polypropylene) ink, water-based ink, plastic ink, PMMA (poly methyl methacrylate) ink, and PS (Polystyrene) ink. The ink particles may contain at least one of metal ink, UV ink, or curing ink.

[0086] In one embodiment of the invention, light diffused by the resin layer 420 is transmitted through the adhesive layer 415 and emitted as uniform surface light through the optical film 430. At this time, the light-shielding member 450 can prevent hot spots caused by incident light. In another embodiment of the invention, a layer of reflective material or an upper substrate may be placed on top of the resin layer 420. The layer of reflective material or upper substrate may face the upper surface of the resin layer 420, the light-emitting element 100 may be arranged in at least one row or column, and each emission surface 81 of the light-emitting element 100 may be spaced the same as one side surface of the resin layer 420, and light may be emitted through one side surface of the resin layer 420.

[0087] On the other hand, the pattern P1 of the light-shielding member 450 according to the embodiment of the invention may be printed on the surface of the optical film 430. When the light-shielding pattern is formed by a printing method, more precise patterns, both small and large, can be manufactured without the phenomenon of disappearance or aggregation. Furthermore, since the desired light-shielding pattern is formed by design, a decrease in the uniformity of the image for each product can be prevented, the pattern density can be easily adjusted, and a decrease in the reliability of the lamp image can be prevented.

[0088] The upper surface area of ​​the first light-shielding portion 451 can be five times or more the upper surface area of ​​the light-emitting element 100, for example, in the range of 5 to 12 times or 6 to 10 times. The upper surface area of ​​the first light-shielding portion 451 is the upper surface area of ​​the region formed by a virtual line connecting the outer edges of the pattern of the first light-shielding portion 451. The upper or lower surface area of ​​the second light-shielding portion 452 can be five times or less the upper surface area of ​​the light-emitting element 100, in the range of 2 to 5 times or 2 to 3 times. The upper or lower surface area of ​​the second light-shielding portion 452 is the upper or lower surface area of ​​the region within the virtual line connecting the outer edges of the pattern of the second light-shielding portion 452. Here, the lower or upper surface area of ​​the second light-shielding portion 452 also includes the region overlapping with the third light-shielding portion 453.

[0089] The lower surface area of ​​the third light-shielding portion 453 can be 3 times or less the upper surface area of ​​the light-emitting element 100, in the range of 1.2 to 3 times or in the range of 1.2 to 2.5 times. The upper or lower surface area of ​​the third light-shielding portion 453 is the area of ​​the upper or lower surface of the region within a virtual line connecting the outer edges of the pattern of the third light-shielding portion 453. The upper surface area of ​​the third light-shielding portion 453 also includes the region that overlaps perpendicularly with the second light-shielding portion 452. The lower surface area of ​​the second light-shielding portion 452 may be smaller than the upper surface area of ​​the first light-shielding portion 451 and larger than the lower surface area of ​​the third light-shielding portion 453. The first to third light-shielding portions 451, 452, and 453 can provide a uniform light transmittance, for example, a uniformity of 80% or more, depending on the pattern or light-shielding area.

[0090] Figure 7 is a plan view of a vehicle to which the lighting module according to the embodiment is applied, and Figure 8 is a drawing showing a vehicle lamp having the lighting module or lighting device disclosed in the embodiment.

[0091] Referring to Figures 7 and 8, in vehicle 900, the taillight 800 may include a first lamp unit 812, a second lamp unit 814, a third lamp unit 816, and a housing 810. Here, the first lamp unit 812 may be a light source for the role of an indicator light, the second lamp unit 814 may be a light source for the role of a side marker light, and the third lamp unit 816 may be a light source for the role of a brake light, but is not limited to these. At least one or all of the first to third lamp units 812, 814, and 816 may include the lighting module disclosed in the embodiment. The housing 810 houses the first to third lamp units 812, 814, and 816 and may be made of a translucent material. In this case, the housing 810 may have curves according to the design of the vehicle body, and the first to third lamp units 812, 814, and 816 may embody surface light sources that have curved surfaces according to the shape of the housing 810. Such vehicle lamps can be applied to vehicle turn signal lamps when the lamp unit is applied to the vehicle's taillights, brake lights, or turn signal lamps.

[0092] The features, structures, and effects described in the above embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to one embodiment. Furthermore, the features, structures, and effects exemplified in each embodiment can be combined or modified for implementation in other embodiments by a person with ordinary skill in the art to which the embodiment belongs. Therefore, such combinations and modifications should be interpreted as being within the scope of the present invention. In addition, although the above has focused on embodiments, these are merely examples and do not limit the present invention. A person with ordinary skill in the art to which the present invention belongs can make various modifications and applications not exemplified above, as long as they do not deviate from the essential characteristics of these embodiments. For example, each component specifically presented in the embodiments can be modified and implemented. And the differences related to such modifications and applications should be interpreted as being within the scope of the present invention as defined in the appended claims.

Claims

1. circuit board and A resin layer disposed on the substrate, A plurality of light-emitting elements are sealed within the resin layer and electrically connected to the substrate, An optical film disposed on the resin layer, A plurality of light-shielding members are arranged on the lower surface of the optical film, and at least a portion of them overlaps each of the plurality of light-emitting elements in a perpendicular direction, The optical film and the resin layer are disposed between them, The adhesive layer includes a plurality of opening regions in which each of the plurality of light-shielding members is arranged. Each of the plurality of light-emitting elements includes a light-emitting surface that emits light on one side, Each of the plurality of light-shielding members includes a plurality of light-shielding patterns and an air gap disposed between and outside the plurality of light-shielding patterns. The upper surface area of ​​the air gap is in the range of 0.9 to 1.1 times the upper surface area of ​​the light-shielding pattern. A lighting device in which the optical film has a light uniformity of 80% or more.

2. The lighting device according to claim 1, wherein the upper surface area of ​​the air gap within each of the light-shielding members is in the range of 0.9 to 1.1 times the upper surface area of ​​the light-shielding pattern.

3. The lighting device according to claim 2, wherein the outer pattern of the light-shielding pattern is positioned outside the opening region and in contact with the adhesive layer.

4. The lighting device according to claim 3, wherein the light-shielding pattern is in contact with the adhesive layer along the outer boundary line of the opening region.

5. The lighting device according to claim 3 or 4, wherein the light-shielding pattern positioned outside the aperture region has the thinnest thickness of the light-shielding pattern.

6. The lighting device according to claim 1, wherein in each of the plurality of opening regions, the upper surface area of ​​the air gap is in the range of 1 to 1.1 times the upper surface area of ​​the light-shielding pattern.

7. The lighting device according to claim 6, wherein the outer pattern of the light-shielding pattern is arranged inside the opening region of the adhesive layer.

8. The lighting device according to claim 6 or 7, wherein the contact area between the outer pattern of the plurality of light-shielding patterns and the adhesive layer is 3% or less along the boundary line of the opening region.

9. The lighting device according to claim 1 or 6, wherein the plurality of light-shielding patterns are spaced apart from the upper surface of the resin layer.

10. The lighting device according to claim 1 or 6, wherein the upper surface area of ​​each of the plurality of light-shielding members is in the range of 6 to 10 times the upper surface area of ​​each of the plurality of light-emitting elements.

Images