Lighting module and lighting apparatus

Abstract

A lighting device according to an embodiment of the invention comprises a substrate; a plurality of light-emitting elements disposed on the substrate; a resin layer covering the plurality of light-emitting elements; and a reflective member disposed on the resin layer, wherein the resin layer has first and second sides disposed on both sides of a first direction and third and fourth sides disposed on both sides of a second direction orthogonal to the first direction, and the length of the second direction of the resin layer is longer than the length of the first direction, and the plurality of light-emitting elements include a plurality of first light-emitting elements disposed in a first row along the first side and a plurality of second light-emitting elements disposed in a second row along the second side, wherein the plurality of first light-emitting elements have a plurality of first groups in which five or fewer are periodically disposed, and the plurality of second light-emitting elements have a plurality of second groups in which five or fewer are periodically disposed, and the first light-emitting elements and the second light-emitting elements can emit light in opposite directions.

Description

Technology Field

[0001] An embodiment of the invention relates to a lighting module and a lighting device having a plurality of light-emitting elements.

[0002] The embodiment relates to a light unit having a lighting module and a lighting device, a liquid crystal display, and a vehicle lamp. Background Technology

[0003] Conventional lighting applications include not only automotive lighting but also backlights for displays and signage. Light-emitting elements, such as light-emitting diodes (LEDs), offer advantages over conventional light sources like fluorescent and incandescent lamps, including low power consumption, a semi-permanent lifespan, fast response speed, safety, and environmental friendliness. These light-emitting elements are applied to various lighting devices, such as display systems, interior lights, and exterior lights. Recently, lamps employing light-emitting elements have been proposed as automotive light sources. Compared to incandescent lamps, light-emitting elements are advantageous in that they consume less power. However, because the emission angle of light from the light-emitting element is small, there is a requirement to increase the light-emitting surface area when using light-emitting elements for automotive lamps. Since light-emitting elements are small, they allow for greater design freedom, and their semi-permanent lifespan provides economic benefits. The problem to be solved

[0004] An embodiment of the invention provides a lighting module and a lighting device having light-emitting elements arranged in at least two rows on a substrate having a long length in one direction.

[0005] An embodiment of the invention provides a lighting module and a lighting device in which rows of a plurality of light-emitting elements arranged on a substrate irradiate light in different directions.

[0006] An embodiment of the invention provides a lighting module and a lighting device in which rows of a plurality of light-emitting elements disposed within a resin layer irradiate light toward different sides.

[0007] An embodiment of the invention provides a lighting module and a lighting device that irradiate line-shaped side light or surface light.

[0008] An embodiment of the invention may provide a light unit having a lighting module, a liquid crystal display, and a vehicle lamp. means of solving the problem

[0009] A lighting device according to an embodiment of the invention comprises a substrate; a plurality of light-emitting elements disposed on the substrate; a resin layer covering the plurality of light-emitting elements; and a reflective member disposed on the resin layer, wherein the resin layer has first and second sides disposed on both sides of a first direction and third and fourth sides disposed on both sides of a second direction orthogonal to the first direction, and the length of the second direction of the resin layer is longer than the length of the first direction, and the plurality of light-emitting elements include a plurality of first light-emitting elements disposed in a first row along the first side and a plurality of second light-emitting elements disposed in a second row along the second side, wherein the plurality of first light-emitting elements have a plurality of first groups in which five or fewer are periodically disposed, and the plurality of second light-emitting elements have a plurality of second groups in which five or fewer are periodically disposed, and the first light-emitting elements and the second light-emitting elements can emit light in opposite directions.

[0010] According to an embodiment of the invention, the plurality of first light-emitting elements emit light toward the third side of the resin layer, and the plurality of second light-emitting elements can emit light toward the fourth side of the resin layer.

[0011] According to an embodiment of the invention, the plurality of first light-emitting elements emit light toward opposite third and fourth sides from the center between the first to fourth sides of the lighting device, and the plurality of second light-emitting elements can emit light toward the center between the first to fourth sides of the lighting device.

[0012] According to an embodiment of the invention, the plurality of first light-emitting elements emit light toward the third or fourth side of the resin layer, and the plurality of second light-emitting elements can emit light toward the first side of the resin layer.

[0013] According to an embodiment of the invention, the resin layer can emit light through the first side.

[0014] A lighting device according to an embodiment of the invention comprises a substrate; a plurality of light-emitting elements disposed on the substrate; a resin layer covering the plurality of light-emitting elements; and a reflective member disposed on the resin layer, wherein the resin layer has first and second sides disposed on both sides of a first direction and third and fourth sides disposed on both sides of a second direction orthogonal to the first direction, and the length of the second direction of the resin layer is longer than the length of the first direction, and the plurality of light-emitting elements include a plurality of first light-emitting elements disposed in a first row along the first side and a plurality of second light-emitting elements disposed in a second row along the second side, wherein the plurality of first light-emitting elements have a plurality of first groups in which five or fewer are periodically disposed, and the plurality of second light-emitting elements have a plurality of second groups in which five or fewer are periodically disposed, and the first light-emitting elements and the second light-emitting elements can emit light in the same direction.

[0015] According to an embodiment of the invention, the first light-emitting elements and the second light-emitting elements can emit light toward the first side of the resin layer.

[0016] According to an embodiment of the invention, the first side of the lighting device may include a concave coupling groove in the area between the first group. Effects of the invention

[0017] According to an embodiment of the invention, the light intensity of the light source can be improved.

[0018] According to an embodiment of the invention, a line-shaped surface light source can be provided.

[0019] According to an embodiment of the invention, light loss can be reduced to improve light efficiency.

[0020] According to an embodiment of the invention, since a thin lighting module is provided in the form of a line light source, design freedom can be increased and the light uniformity of a surface light source can be improved.

[0021] The optical reliability of the lighting module and the lighting device having the same according to an embodiment of the invention can be improved.

[0022] The reliability of a vehicle lighting device having a lighting module according to an embodiment of the invention can be improved.

[0023] Embodiments of the invention can be applied to a light unit having a lighting module, various display devices, a surface light source lighting device, and a vehicle lamp. Brief explanation of the drawing

[0024] FIG. 1 is a plan view showing a lighting device according to an embodiment of the invention. Figure 2 is a partial enlarged view of Figure 1. Figure 3 is a cross-sectional view of the lighting device of Figure 2 on the AA side. Figure 4 is a cross-sectional view of the BB side of the lighting device of Figure 2. Figure 5 is another example of the lighting device of Figure 4. FIG. 6 is a plan view showing a first modified example of the lighting device of FIG. 1. FIG. 7 is a plan view showing a second variation example of the lighting device of FIG. 1. Figure 8 is a partial enlarged view of the lighting device of Figure 7. Figure 9 is an example of a side cross-sectional view of the lighting device of Figure 7. FIG. 10 is a plan view showing a third variation example of the lighting device of FIG. 1. Figure 11 is a cross-sectional view of the CC side of the lighting device of Figure 10. FIG. 12 is a plan view showing a fourth variation example of the lighting device of FIG. 1. FIG. 13 is an example of a front view of a light-emitting element placed on a substrate of the lighting device of the invention. FIG. 14 is an example of a side view of the light-emitting element of FIG. 13. Figure 15 is a light distribution diagram of the lighting device of Figure 1. Figure 16 shows the luminous intensity of the lighting device of Figure 1 measured at a test point. Figure 17 is a light distribution diagram of the lighting device of Figure 6. Figure 18 shows the light intensity of the lighting device of Figure 6 measured at a test point. FIG. 19 is a drawing showing an example of a plan view of a vehicle having the lighting device of the invention. Figure 20 is an example of a taillight of a vehicle to which the lighting device of Figure 19 is applied. Specific details for implementing the invention

[0025] Preferred embodiments that can be easily practiced by a person skilled in the art to which the present invention pertains are described in detail below with reference to the attached drawings. However, it should be understood that the embodiments described in this specification and the configurations illustrated in the drawings are merely preferred embodiments of the present invention, and that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0026] In describing the operating principles of preferred embodiments of the present invention in detail, specific descriptions of related known functions or configurations are omitted if it is determined that such detailed descriptions could unnecessarily obscure the essence of the present invention. The terms described below are defined in consideration of their functions in the present invention, and the meaning of each term should be interpreted based on the content throughout this specification. The same reference numerals are used for parts having similar functions and operations throughout the drawings.

[0027] The lighting device according to the present invention can be applied to various lamp devices requiring lighting, such as vehicle lamps, household lighting devices, and industrial lighting devices. For example, when applied to vehicle lamps, 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 realized through future technological advancements.

[0028] The embodiments will become apparent below through the attached drawings and the description of the embodiments. In the description of the embodiments, where each layer (film), region, pattern, or structure is described as being formed "on" or "under" the substrate, each layer (film), region, pad, or pattern, "on" and "under" include both being formed "directly" and "indirectly" through another layer. Furthermore, the reference for the "on" or "under" of each layer is described based on the drawings.

[0030] FIG. 1 is a plan view showing a lighting device according to an embodiment of the invention, FIG. 2 is a partial enlarged view of FIG. 1, FIG. 3 is a cross-sectional view of the lighting device of FIG. 2 on the AA side, and FIG. 4 is a cross-sectional view of the lighting device of FIG. 2 on the BB side.

[0031] Referring to FIGS. 1 to 4, a lighting device (200) according to an embodiment of the invention may include a plurality of light-emitting elements (100: 111, 112) that emit light in different directions. The plurality of light-emitting elements (100: 111, 112) may be arranged in different rows, for example, two or more rows or two to four rows. The lighting device (200) irradiates the light emitted from the light-emitting elements (100) as a line-shaped surface light source.

[0032] The lighting device (200) irradiates light (L1) in a first direction (X), and the plurality of light-emitting elements (111, 112) can emit light in a direction (Y) orthogonal to the first direction (X). The lighting device (200) can emit light through either one of the two sides (S1, S2) of the first direction (X), or emit light through both sides.

[0033] The lighting device (200) may include a substrate (210), a resin layer (220) on the substrate (210), a plurality of light-emitting elements (111, 112) disposed between the substrate (210) and the resin layer (220), and a reflective member (240) disposed on the resin layer (220). The lighting device (200) may include a first reflective layer (230) disposed between the substrate (210) and the resin layer (220), and the plurality of light-emitting elements (111, 112) may be electrically connected to the substrate (210) through the first reflective layer (230).

[0034] The lighting device (200) may have a second direction (Y) longer than the first direction (X) (C1). The second direction (Y) of the lighting device (200) may be at least three times the length (C1) of the first direction (X), for example, in the range of 3 to 20 times. Accordingly, it may be provided as a line lighting device for a vehicle lamp. The first direction (X) may be the short axis direction, and the second direction (Y) may be the long axis direction.

[0035] The lighting device (200) includes first to fourth sides (S1-S4), wherein the first side (S1) and the second side (S2) are both sides of the first direction (X), and the third and fourth sides (S3,S4) are both sides of the second direction (Y). The first and second sides (S1,S2) are long sides, and the third and fourth sides (S3,S4) are short sides. The first side (S1) may be a flat or convex curved surface with respect to a straight line connecting both ends. The second side (S2) may be a flat or concave curved surface with respect to a straight line connecting both ends.

[0036] The gap between the first and second sides (S1, S2) is the length (C1) of the first direction (X), and the gap between the third and fourth sides (S3, S4) is the length of the second direction (Y). The first to fourth sides (S1-S4) may be each side of the substrate (210), the resin layer (220), the reflective layer (230), and the reflective member (240). Here, the reflective layer (230) may not be exposed to at least one or all of the first to fourth sides (S1-S4), and a portion of the resin layer (220) may be in contact with the upper edge of the substrate (210).

[0038] The substrate (210) includes a printed circuit board (PCB), and may include, for example, a resin-based printed circuit board (PCB), a metal core PCB, a flexible PCB, a ceramic PCB, or an FR-4 substrate. The substrate (210) may be a substrate made of a flexible or non-flexible material. A circuit pattern may be disposed on the upper surface of the substrate (210). The circuit pattern of the substrate (210) is electrically connected to the light-emitting elements (111, 112), and may have a plurality of pads (not shown) in the lower region of each of the light-emitting elements (111, 112).

[0039] The plurality of light-emitting elements (111, 112) may be connected in series or in parallel by the circuit pattern of the substrate (210). As another example, the plurality of light-emitting elements (111, 112) may be arranged in groups of two or three or more and connected in series or in parallel in groups.

[0040] The plurality of light-emitting elements (111, 112) may be embedded in the lower part of the resin layer (220). The sides and top surfaces of the plurality of light-emitting elements (111, 112) may be in contact with the resin layer (220).

[0041] The plurality of light-emitting elements (111, 112) may include a plurality of first light-emitting elements (111) arranged along the first side (S1) adjacent to the first side (S1), and a plurality of second light-emitting elements (112) arranged along the second side (S2) adjacent to the second side (S2). The plurality of first light-emitting elements (111) may be arranged in at least one row and may be defined as a first light-emitting unit (201). The plurality of second light-emitting elements (112) may be arranged in at least one row and may be defined as a second light-emitting unit (202). The first and second light-emitting units (201, 202) may each emit light or emit light simultaneously.

[0042] The plurality of first light-emitting elements (111) and the plurality of second light-emitting elements (112) may emit light in opposite directions or on both sides of the second direction (Y). For example, the plurality of first light-emitting elements (111) may emit light toward the third side (S3), and the plurality of second light-emitting elements (112) may emit light toward the fourth side (S4). As another example, the plurality of first light-emitting elements (111) may emit light toward the fourth side (S4), and the plurality of second light-emitting elements (112) may emit light toward the third side (S3).

[0043] The first light-emitting unit (201) and the second light-emitting unit (202) may emit the same color or different colors. For example, the first light-emitting unit (201) or the second light-emitting unit (202) may emit at least one of blue, red, green, or white.

[0044] A virtual line connecting the centers of adjacent first light-emitting elements (111) in the first light-emitting unit (201) may be positioned closer to the first side (S1) than a straight line connecting the centers of the first and second elements (1A, 1B) located at both ends of the plurality of first light-emitting elements (111), and may have a convex curved shape. The minimum distance between the first element (1A) and the fourth side (S4) may be smaller than the minimum distance between the second element (1B) and the third side (S3). Accordingly, a light diffusion area of ​​the second element (1B) can be secured.

[0045] A virtual line connecting the centers of adjacent second light-emitting elements (112) in the second light-emitting part (202) may be positioned closer to the first side (S1) than a straight line connecting the centers of the third and fourth elements (2A, 2B) located at both ends of the plurality of second light-emitting elements (112), and may have a convex curved shape. The minimum distance between the third element (2A) and the third side (S3) may be smaller than the minimum distance between the fourth element (2B) and the fourth side (S4). Accordingly, a light diffusion area of ​​the fourth element (2B) can be secured.

[0046] As shown in FIG. 2, the gap (C3) between the first light-emitting element (111) and the first side (S1) may be larger than the gap (C4) between the second light-emitting element (112) and the second side (S2). Accordingly, light diffusion can be improved through the area between the first light-emitting element (111) and the first side (S1). The gap (C2) between the first light-emitting element (111) and the second light-emitting element (112) may be larger than the gap (C4) between the second light-emitting element (112) and the second side (S2), and may be the same as or different from the gap (C3) between the first light-emitting element (111) and the first side (S1).

[0048] The first light-emitting unit (201) has a plurality of first groups (LG1), and each first group (LG1) may have five or fewer first light-emitting elements (111) arranged periodically. The first group (LG1) may, for example, be in the range of 2 to 5 or 2 to 4. The first light-emitting elements (111) within the first group (LG1) have a first period (B1), and the first groups (LG1) may have a first interval (B4). The first period (B1) may be smaller than the first interval (B4) and may be 0.5 times or less. Since the first groups (LG1) have a first period (B1), a decrease in light intensity caused by the first light-emitting elements (111) within the first group (LG1) can be prevented.

[0049] The second light-emitting unit (202) has a plurality of second groups (LG2), and each second group (LG2) may have five or fewer second light-emitting elements (112) arranged periodically. The second group (LG2) may, for example, be in the range of 2 to 5 or 2 to 4. The second light-emitting elements (112) within the second group (LG2) have a second period (B2), and the second groups (LG2) may have a second interval (B5). The second period (B2) may be smaller than the second interval (B5) and may be 0.5 times or less. Since the second group (LG2) has a second period (B2), a decrease in light intensity caused by the second light-emitting elements (112) within the second group (LG2) can be prevented.

[0050] The maximum distance (G1) between the first light-emitting elements (111) arranged in each of the first groups (LG1) may be greater than the first spacing (B4) between the first groups (LG1), for example, at least 1 time the first spacing (B4), for example, in the range of 1 to 1.2 times. The maximum distance (G2) between the second light-emitting elements (112) arranged in each of the second groups (LG2) may be greater than the second spacing (B5) between the second groups (LG2), for example, at least 1 time the second spacing (B5), for example, in the range of 1 to 1.2 times. Accordingly, the number of light-emitting elements within each group (LG1, LG2) can be reduced.

[0052] The first region (R1) between adjacent first groups (LG1) in the row of the first light-emitting element (111) and the second region (R2) between adjacent second groups (LG2) in the row of the second light-emitting element (112) may correspond to or be connected to each other. The first region (R1) may overlap with at least one of the second light-emitting elements (112) in the first direction (X). The second region (R2) may overlap with at least one of the first light-emitting elements (111) in the first direction (X). At least one of the second light-emitting elements (112) may overlap with at least one of the first light-emitting elements (111) in the first direction (X), that is, in a direction orthogonal to the emission direction. Accordingly, the occurrence of dark areas in the regions (R1, R2) between the first and second groups (LG1, LG2) can be suppressed.

[0053] The lighting device (200) is provided with coupling grooves (101, 102). Among the coupling grooves (101, 102), the inner coupling groove (101) is concavely positioned on the first side (S1), and the outer coupling groove (102) is concavely positioned at both ends of the first side (S1). The inner coupling grooves (101) are each positioned in different regions and may be concave toward the first region (R1). The plurality of inner coupling grooves (101) may overlap with the first region (R1) in a first direction (X). The outer coupling grooves (102) may overlap with the first direction (X) among the first and second elements (1B) or the third and fourth elements (2A, 2B).

[0055] As shown in FIGS. 3 and 4, each of the light-emitting elements (100: 111, 112) may include a device having a light-emitting chip (11A, 12A) or a package in which an LED chip is packaged. The light-emitting chip (11A, 12A) may emit at least one of blue, red, green, and ultraviolet (UV) light. Each of the light-emitting elements (111, 112) may emit at least one of white, blue, red, and green light. The light-emitting elements (111, 112) emit light in a lateral direction, and a bottom portion may be disposed on the substrate (210). The light-emitting elements (111, 112) may be of a side view type. As another example, the light-emitting elements (111, 112) may be LED chips, and one side of the LED chip may be open and a reflective member may be disposed on the other side.

[0056] The emission surface (11, 12) of the light-emitting element (111, 112) may be positioned in a direction perpendicular to the upper surface of the substrate (210). The emission surface (11, 12) is positioned on one side between the bottom and upper surface of each of the light-emitting elements (111, 112) and emits light in the second direction (Y). The emission surface (11, 12) of the light-emitting element (111, 112) may be adjacent to the reflection layer (230) and may be a surface perpendicular to the upper surface of the substrate (210) and the upper surface of the reflection layer (230).

[0057] The length (D2) of the first direction (X) of the light-emitting element (111, 112) may be greater than the thickness of the light-emitting element (111, 112), and may be 1.5 times or more than the thickness of the light-emitting element (111, 112), for example, in the range of 1.5 times to 3 times. Due to the long length (D2) of the light-emitting element (111, 112), a plurality of light-emitting chips may be mounted inside. The thickness of the light-emitting element (111, 112) may be 3 mm or less, for example, 2 mm or less. The thickness of the light-emitting element (111, 112) may be in the range of 1 mm to 2 mm, for example, in the range of 1.2 mm to 1.8 mm. Since these light-emitting elements (111, 112) have a thin thickness and a long length in the first direction (X), they can provide a wide light emission angle in the first direction (X), which is the left-right direction relative to the center of the light-emitting elements (111, 112). Here, the light emission angle in the first direction (X) of the light-emitting elements (111, 112) may be larger than the light emission angle in the third direction (Z), which is the up-down direction. The light emission angle in the first direction (X) of the light-emitting elements (111, 112) may have a range of 110 degrees to 160 degrees.

[0058] Here, the thickness (Za) of the substrate (210) may be smaller than the thickness of the light-emitting element (111, 112). The thickness of the light-emitting element (111, 112) may be at least twice the thickness (Za) of the substrate (210), for example, in the range of 2 to 4 times. Since the thickness (Za) of the substrate (210) is provided thinly, the lighting device (200) may be provided as a flexible plate.

[0060] The resin layer (220) may be placed on the substrate (210). The reflective layer (230) is placed between the resin layer (220) and the substrate (210) and may reflect light emitted from the light-emitting element (100). The resin layer (220) may cover the light-emitting element (100). The resin layer (220) may be in contact with the upper surface and sides of the light-emitting element (100). The resin layer (220) may be in contact with the upper surface of the reflective layer (230). A portion of the resin layer (220) may be in contact with the substrate (210) through the reflective layer (230). The resin layer (220) may be in contact with the emission surface of the light-emitting element (100). Each side (S1-S4) of the resin layer (220) is a side between the reflective layer (230) and the reflective member (240).

[0061] The third side (S3) of the resin layer (220) faces the emission surface (11) of the first light-emitting element (111), and the fourth side (S4) faces the emission surface (12) of the second light-emitting element (112). The first side (S1) of the resin layer (220) faces the non-emission surface of the first light-emitting element (111), and the second side (S2) of the resin layer (220) may face the non-emission surface of the second light-emitting element (112).

[0062] The upper surface area of ​​the resin layer (220) may be equal to or smaller than the upper surface area of ​​the substrate (210). The upper surface area of ​​the resin layer (220) may be equal to or larger than the upper surface area of ​​the reflective layer (230). The upper surface area of ​​the resin layer (220) may be equal to or smaller than the upper surface area of ​​the reflective member (240). The length of the resin layer (220) in the second direction (Y) may be equal to or smaller than the length of the substrate (210).

[0064] The resin layer (220) is positioned between the reflective layer (230) and the reflective member (240), and can guide the light emitted from the first and second light-emitting elements (111, 112) by diffusing the light reflected to the reflective layer (230) and the reflective member (240). That is, since the first and second light-emitting elements (111, 112) emit light in the direction of the long axis rather than the short axis direction of the resin layer (220), the resin layer (220) can provide a uniform light distribution, i.e., line light, through the first side (S1). In addition, it is not necessary to separately form balls on the first side (S1) of the resin layer (220).

[0066] The resin layer (220) may have a thickness (Zb) greater than the thickness of the light-emitting element (100). Accordingly, the resin layer (220) can protect the upper surface of the light-emitting element (100) and prevent moisture penetration. Since the light-emitting element (100) has a substrate (210) placed on the lower side and a resin layer (220) placed on the upper side, the light-emitting element (100) can be protected. Therefore, the gap between the upper surface of the resin layer (220) and the light-emitting element (100) can be placed in a range of 0.6 mm or less, for example, from 0.5 mm to 0.6 mm.

[0067] The thickness (Zb) of the resin layer (220) is the distance between the reflective layer (230) and the reflective member (240), and may be smaller than the distance between the first side (S1) and the second side (S2). The lighting device (200) provides a line-shaped surface light source having a thin thickness and can improve light intensity and prevent hot spots. Additionally, it can provide a lighting module that is flexible in a third direction (Z).

[0068] The thickness (Zb) of the resin layer (220) may be less than or equal to twice the thickness of the light-emitting element (100), for example, greater than 1 time and less than or equal to 2 times. The thickness (Zb) of the resin layer (220) may be, for example, in the range of 1.5 mm to 1.9 mm or in the range of 1.6 mm to 1.8 mm. The thickness (Zb) of the resin layer (220) may be less than or equal to 0.8 times the thickness (Z1) of the lighting device (200), for example, in the range of 0.4 times to 0.8 times the thickness (Z1) of the lighting device (200). Since the resin layer (220) is positioned with a difference of 1.2 mm or less from the thickness (Z1) of the lighting device (200), it is possible to prevent a decrease in light efficiency in the lighting device (200) and to enhance flexible properties.

[0069] The resin layer (220) may include a resin material such as silicone, silicone molding compound (SMC), epoxy, or epoxy molding compound (EMC). The resin layer (220) may include a UV (ultra violet) curable resin or a thermosetting resin material, and may optionally include, for example, PC, OPS, PMMA, PVC, etc. For example, the main material of the resin layer (220) may use a resin material with urethane acrylate oligomer as the main raw material. For example, a synthetic oligomer, such as urethane acrylate oligomer, may be mixed with a polymer type such as polyacrylate. Of course, the mixture may further include monomers such as IBOA (isobornyl acrylate), HPA (Hydroxylpropyl acrylate), 2-HEA (2-hydroxyethyl acrylate), which are low-boiling point diluted reactive monomers, and may also include photoinitiators (such as 1-hydroxycyclohexyl phenyl-ketone) or antioxidants as additives.

[0070] The resin layer (220) may contain beads, and the beads may diffuse and reflect incident light to increase the amount of light. The resin layer (220) may contain a phosphor. The phosphor may include at least one of a yellow phosphor, a green phosphor, a blue phosphor, and a red phosphor.

[0072] The reflective layer (230) can reflect light emitted from the light-emitting element (100). The reflective layer (230) can be formed on the upper surface of the substrate (210). The reflective layer (230) can be formed as an upper layer of the substrate (210) or as a separate layer. The reflective layer (230) can be attached to the upper surface of the substrate (210) with an adhesive. The resin layer (220) can be attached to the upper surface of the reflective layer (230). The reflective layer (230) has a plurality of holes (232) in an area corresponding to the lower surface of the light-emitting element (100), and the light-emitting element (100) can be connected to the substrate (210) through the holes (232). A portion of the resin layer (220) can be in contact with the substrate (210) through the holes (232). The hole (232) may be an area where the light-emitting element (100) is bonded to the substrate (210).

[0073] The reflective layer (230) may be formed as a single layer or a multilayer structure. The reflective layer (230) may include a material that reflects light, such as a metal or a non-metal material. If the reflective layer (230) is metal, it may include a metal layer such as stainless steel, aluminum (Al), or silver (Ag); if it is a non-metal material, it may include a white resin material or a plastic material. The reflective layer (230) may include a white resin material or a polyester (PET) material. The reflective layer (230) may include at least one of a low-reflection film, a high-reflection film, a diffuse-reflection film, or a specular-reflection film. The reflective layer (230) may be provided, for example, as a specular-reflection film to reflect incident light to a first side (S1). The thickness (Zc) of the reflective layer (230) may be smaller than the thickness (Za) of the substrate (210). The thickness (Zc) of the reflective layer (230) is positioned to be at least 0.5 times the thickness (Za) of the substrate (210) to reduce the transmission loss of incident light. The thickness (Zc) of the reflective layer (230) may be in the range of 0.2 mm to 0.4 mm, and if it is smaller than the above range, light transmission loss may occur, and if it is thicker than the above range, the thickness (Z1) of the lighting device (200) may increase.

[0075] The reflective member (240) may be placed on the resin layer (220). The reflective member (240) may be adhered to the upper surface of the resin layer (220). The reflective member (240) may be placed over the entire upper surface of the resin layer (220) to reduce light loss. The reflective member (240) may be made of the same material as the reflective layer (230). To reflect light and reduce light transmission loss, the reflective member (240) may be made of a material with a higher light reflectivity than the material of the reflective layer (230) or have a thicker thickness. The reflective member (240) may have the same thickness as the reflective layer (230) or a thicker thickness.

[0076] The thickness (Zd) of the reflective member (240) may be smaller than the thickness (Za) of the substrate (210). The thickness (Zd) of the reflective member (240) may be positioned to be at least 0.5 times the thickness (Za) of the substrate (210) to reduce the transmission loss of incident light. The thickness (Zd) of the reflective member (240) may be in the range of 0.2 mm to 0.4 mm; if it is smaller than the above range, light transmission loss may occur, and if it is thicker than the above range, the thickness (Z1) of the lighting device (200) may increase.

[0077] The reflective member (240) may be formed in a single-layer or multi-layer structure. The reflective member (240) may include a material that reflects light, such as a metal or non-metal material. If the reflective member (240) is metal, it may include a metal layer such as stainless steel, aluminum (Al), or silver (Ag); if it is a non-metal material, it may include a white resin material or a plastic material. The reflective member (240) may include a white resin material or a polyester (PET) material. The reflective member (240) may include at least one of a low-reflection film, a high-reflection film, a diffuse reflection film, or a specular reflection film. The reflective member (240) may be provided as a specular reflection film.

[0078] The first side (S1) of the resin layer (220) can be treated as a haze surface to diffuse light. The haze surface can be treated as a rougher surface than the second side (S2) of the resin layer (220) to diffuse the emitted light.

[0079] A lighting device (200) according to an embodiment of the invention may provide a line-shaped thickness (Z1) in a third direction (Z) to provide a flexible, line-shaped surface light source. The thickness (Z1) of the lighting device (200) may be 5 mm or less, for example, in the range of 1 mm to 5 mm or 1.5 mm to 3 mm. That is, the lighting device (200) may be provided as a line-shaped surface light source of 5 mm or less. As another example, the thickness of the lighting device (200) may be provided in the range of 3 mm to 6 mm to increase the light distribution area.

[0080] The light distribution of the lighting device of FIGS. 1 to 4 is measured as shown in FIGS. 15 and 16, and it can be seen that it exhibits a uniform light distribution across the entire area based on the front (H (Horizontal), V (Vertical)). At the test point in FIG. 16, 10U is the value measured at a point 10 degrees up from the reference, 5L is the value measured at a point 5 degrees left from the reference, 5R is the value measured at a point 5 degrees right from the reference, V indicates vertical, H indicates horizontal, and 5D indicates a point 5 degrees down from the reference.

[0082] Although the lighting device of the invention was described as an example of emitting light (L1) to the first side (S1), it can emit light to both the first side (S1) and the second side (S2). In addition, a layer of reflective material may be laminated on the outer side of the third and fourth sides (S3, S4) or the light may be blocked by an outer wall.

[0083] As shown in FIG. 5, the lighting device may have a light-blocking wall (250) placed on a second side (S2). The light-blocking wall (250) may be placed on the second side (S2) of the resin layer (220). The light-blocking wall (250) may extend from the substrate (210) to the reflective member (240) on the second side (S2). The light-blocking wall (250) may be formed of a reflective material to block external light loss.

[0085] As shown in FIG. 6, the lighting device (200) has different rows of light-emitting elements (100: 111, 112), the first light-emitting element (111) of the first row emits light toward the third and fourth sides (S3, S4) on both sides of the second direction (Y), and the second light-emitting element (112) of the second row emits light toward the second direction (Y). Specifically, the first light-emitting element (111) of the first row may have a first group (LG1a, LG1b) that emits light toward both sides (S3, S4) with respect to the center (CP) of the lighting device (200). The second light-emitting element (112) of the second row may have a second group (LG2a, LG2b) that emits light toward the center (CP) of the lighting device (200). That is, the lighting device (200) can emit light in opposite directions from the first light-emitting element (111) in the first column and the second light-emitting element (112) in the second column with respect to the center (CP). Accordingly, the lighting device (200) can emit light (L1) of uniform distribution through the first side (S1) by the light-emitting elements (111, 112) emitting light in different directions. The center (CP) of the lighting device (200) may be the center of the area between the first and second sides (S1, S2) and the area between the third and fourth sides (S3, S4).

[0087] As shown in FIGS. 7 to 9, the lighting device (200) may include light-emitting elements (100: 113, 114) arranged in multiple rows. The lighting device (200) may include light-emitting elements (100: 113, 114) that emit light in the same direction. The light-emitting elements (100: 113, 114) may have a row of multiple first light-emitting elements (113) and a row of multiple second light-emitting elements (114). The row of multiple first light-emitting elements (113) may be defined as a first light-emitting section (205), and the row of multiple second light-emitting elements (1140) may be defined as a second light-emitting section (206).

[0088] The first light-emitting element (113) of the first column emits light in the first direction (X). A plurality of first light-emitting elements (113) can emit light toward the first side (S1). The second light-emitting element (114) of the second column emits light in the first direction (X). A plurality of second light-emitting elements (114) can emit light toward the first side (S1).

[0089] The first light-emitting elements (113) of the first column are arranged in a first group (LG1) of five or fewer, for example, in a range of two to five, along the first column, and a first region (R1) is disposed between the first groups (LG1). The second light-emitting elements (114) of the second column are arranged in a second group (LG2) of five or fewer, for example, in a range of two to five, along the second column, and a second region (R1) is disposed between the second groups (LG2). The first and second regions (R1, R2) can be overlapped in a first direction (X). Accordingly, the occurrence of dark areas in the regions (R1, R2) between the first and second groups (LG3, LG4) can be suppressed.

[0090] The first light-emitting unit (205) has a plurality of first groups (LG3), and each first group (LG3) may have five or fewer first light-emitting elements (113) arranged periodically. The first group (LG3) may, for example, be in the range of 2 to 5 or 2 to 4.

[0091] The second light-emitting unit (206) has a plurality of second groups (LG4), and each second group (LG4) may have five or fewer second light-emitting elements (114) arranged periodically. The second groups (LG4) may, for example, be in the range of 2 to 5 or 2 to 4.

[0092] The maximum distance (G3) between the first light-emitting elements (113) arranged in each of the first groups (LG3) may be greater than the spacing (B4) between the first groups (LG1), for example, at least 1 time the spacing (B4), for example, in the range of 1 time to 1.2 times. The maximum distance (G4) between the second light-emitting elements (112) arranged in each of the second groups (LG4) may be greater than the spacing (B4) between the second groups (LG4), for example, at least 1 time the spacing (B4), for example, in the range of 1 time to 1.2 times. Accordingly, the number of light-emitting elements within each group (LG3, LG4) can be reduced.

[0094] Each of the plurality of first light-emitting elements (113) may overlap with each of the plurality of second light-emitting elements (114) in a first direction (X). As another example, at least one of the plurality of first light-emitting elements (113) may not overlap with each of the plurality of second light-emitting elements (114) in a first direction (X). Each of the plurality of first and second light-emitting elements (113, 114) has an emission surface (13) facing a first side (S1), and one or more light-emitting chips (13A) may be arranged inside.

[0095] The gap (K3) between the first light-emitting element (113) and the first side (S1) may be larger than the gap (K4) between the second light-emitting element (112) and the second side (S2). Accordingly, light diffusion can be improved through the area between the first light-emitting element (113) and the first side (S1). The gap (K2) between the first light-emitting element (113) and the second light-emitting element (114) may be larger than the gap (K4) between the second light-emitting element (112) and the second side (S2), and may be the same as or different from the gap (K3) between the first light-emitting element (113) and the first side (S1). The gap (K2) between the first light-emitting element (113) and the second light-emitting element (114) is smaller than the length (C1) of the first direction (X) of the lighting device (200), and may be at least 0.5 times the length (C1), for example, in the range of 0.5 to 0.7 times. This is because the first and second light-emitting elements (113, 114) emit light toward the first side (S1), so the light emitted from the second light-emitting elements (114) diffuses through the area between the first light-emitting element (113) and the second light-emitting element (114), and light reflection caused by the first light-emitting element (113) can be reduced.

[0096] The light distribution of the lighting device of FIGS. 7 to 9 is measured as shown in FIGS. 17 and 18, and it can be seen that it exhibits a uniform light distribution across the entire area based on the front (H (Horizontal), V (Vertical)). At the test point in FIG. 18, 10U is the value measured at a point 10 degrees up from the reference, 5L is the value measured at a point 5 degrees left from the reference, 5R is the value measured at a point 5 degrees right from the reference, V indicates vertical, H indicates horizontal, and 5D indicates a point 5 degrees down from the reference.

[0098] As shown in FIGS. 10 and 11, the lighting device (200) may include light-emitting elements (100: 111, 114) arranged in multiple rows. The lighting device (200) may include light-emitting elements (100: 111, 114) that emit light in directions orthogonal to each other. The light-emitting elements (100: 113, 114) may have a row of multiple first light-emitting elements (111) and a row of multiple second light-emitting elements (114). The row of multiple first light-emitting elements (111) may be defined as a first light-emitting unit (201), and the row of multiple second light-emitting elements (114) may be defined as a second light-emitting unit (206).

[0099] The first light-emitting element (111) of the first column emits light in a second direction (Y) that is orthogonal to the first direction (X). A plurality of first light-emitting elements (111) may emit light toward at least one or both of the third side (S3) and the fourth side (S4). The second light-emitting element (114) of the second column emits light in the first direction (X). A plurality of second light-emitting elements (114) may emit light toward the first side (S1).

[0101] As shown in FIG. 12, the lighting device (100) emits light to a first side (S1), and a plurality of light-emitting elements (100: 111, 112, 111A, 112A) having multiple rows may be arranged between the first side (S1) and the second side (S2). The lighting device (200) may be arranged in three or more rows, for example, from three to five rows. The lighting device (200) may include a first light-emitting element (111) in the first row from the first side (S1), a second light-emitting element (112) in the second row, a third light-emitting element (111A) in the third row, and a fourth light-emitting element (112A) in the fourth row.

[0102] The plurality of first and third light-emitting elements (111, 111A) emit light toward the third side (S3), and the plurality of second and fourth light-emitting elements (112, 112A) emit light toward the fourth side (S4). The plurality of second light-emitting elements (112) are positioned between the plurality of first and third light-emitting elements (111, 111A), and the plurality of third light-emitting elements (111A) may be positioned between the plurality of second and fourth light-emitting elements (112, 112A).

[0103] Each of the above-mentioned light-emitting elements (100: 111, 112, 111A, 112A) can be arranged in units of groups (LG1, LG2). In addition, the regions (R1, R2) between the groups (LG1, LG2) of the first to fourth light-emitting elements (111, 112, 111A, 112A) of the first to fourth columns can be connected to the regions between the groups (LG1, LG2) of adjacent columns.

[0105] FIG. 13 is a front view showing an example of a light-emitting element applied to a lighting device according to an embodiment of the invention, and FIG. 14 is an example in which the light-emitting element of FIG. 13 is placed on a circuit board.

[0106] Referring to FIGS. 13 and 14, the light-emitting element (100) comprises a body (10) having a cavity (20), a plurality of lead frames (30, 40) within the cavity (20), and one or a plurality of light-emitting chips (71) disposed on at least one of the plurality of lead frames (30, 40). This light-emitting element (100) is an example of a light-emitting element disclosed in the above embodiment and can be implemented as a side-emitting type package.

[0107] The light-emitting element (100) may have a long length in one direction. By providing a long length in one direction, the light-emitting element (100) may be able to mount multiple light-emitting chips (71) inside. The light-emitting element (100) may be provided with a relatively thin thickness, which can reduce the thickness of the lighting module having the light-emitting element (100) and widen the beam angle of light in the longitudinal direction.

[0108] Lead frames (30, 40) are disposed on the bottom of the cavity (20) of the body (10). For example, a first lead frame (30) and a second lead frame (40) are combined with the body (10). The body (10) may be formed of an insulating material. The body (10) may be formed of a reflective material. The body (10) may be formed of a material having a reflectivity higher than the transmittance for wavelengths emitted from a light-emitting chip, for example, a material having a reflectivity of 70% or more. The body (10) may include a reflective material, for example, a resin material to which a metal oxide is added, and the metal oxide may include at least one of TiO2, SiO2, and Al2O3. Such a body (10) can effectively reflect incident light. As another example, the body (10) may be formed of a light-transmitting resin material or a resin material having a phosphor that converts the wavelength of incident light.

[0109] The front surface of the body (10) may be a surface where the cavity (20) is placed and may be a surface where light is emitted. The rear surface of the body (10) may be a surface opposite to the front surface.

[0110] The first lead frame (30) comprises a first lead portion (31) disposed on the bottom of the cavity (20), a first bonding portion (32) on the lower part of the body (10), and a first heat dissipation portion (33) disposed on one side of the body (10). The first bonding portion (32) is bent from the first lead portion (31) within the body (10) and protrudes outward from the body, and the first heat dissipation portion (33) can be bent from the first bonding portion (32).

[0111] The second lead frame (40) comprises a second lead portion (41) disposed at the bottom of the cavity (20), a second bonding portion (42) disposed at the lower part of the body (10), and a second heat dissipation portion (43) disposed on the other side of the body (10). The second bonding portion (42) is bent from the second lead portion (41) within the body (10), and the second heat dissipation portion (43) can be bent from the second bonding portion (42).

[0112] The light-emitting chip (71) may be placed, for example, on the first lead portion (31) of the first lead frame (30) and connected to the first and second lead portions (31, 41) by a wire, or connected to the first lead portion (31) by an adhesive and connected to the second lead portion (41) by a wire. The light-emitting chip (71) may be a horizontal chip, a vertical chip, or a chip having a via structure. The light-emitting chip (71) may be mounted in a flip-chip manner. The light-emitting chip (71) may selectively emit light within the wavelength range of ultraviolet to visible light. The light-emitting chip (71) may emit ultraviolet or blue peak wavelengths, for example. The light-emitting chip (71) may include at least one of a Group II-VI compound and a Group III-V compound. The light-emitting chip (71) may be formed from a compound selected from the group consisting of, for example, GaN, AlGaN, InGaN, AlInGaN, GaP, AlN, GaAs, AlGaAs, InP, and mixtures thereof.

[0113] The light-emitting chips (71) disposed within the cavity (20) of the light-emitting element (100) according to the embodiment may be disposed in one or multiple numbers. The light-emitting chips (71) may be selected from, for example, a red LED chip, a blue LED chip, a green LED chip, or a yellow-green LED chip.

[0114] A molding member (81) is disposed in the cavity (20) of the body (11), and the molding member (81) may be formed in a single layer or a multilayer, and may include a transparent resin such as silicone or epoxy. The molding member (81) or the light-emitting chip (71) may include a phosphor to change the wavelength of the emitted light, and the phosphor excites a portion of the light emitted from the light-emitting chip (71) to emit light of a different wavelength. The phosphor may be selectively formed from quantum dots, YAG, TAG, silicate, nitride, and oxy-nitride-based materials. The phosphor may include at least one of a red phosphor, a yellow phosphor, and a green phosphor, but is not limited thereto. The surface of the molding member (81) may be formed in a flat shape, a concave shape, a convex shape, etc., and may be an emission surface.

[0115] A semiconductor device, such as a light receiving device or a protection device, may be mounted on the body (10) or any one of the lead frames, and the protection device may be implemented as a thyristor, a Zener diode, or a TVS (Transient voltage suppression), and the Zener diode protects the light-emitting chip from ESD (electrostatic discharge).

[0116] The first and second lead portions (33, 43) of the light-emitting element (100) are bonded to the electrode pattern (213, 215) of the substrate (210) with a conductive adhesive member (217, 219), which is solder or conductive tape.

[0118] FIG. 19 is a plan view of a vehicle with a lighting device applied according to an embodiment, and FIG. 20 is a drawing showing an example of a taillight of the vehicle of FIG. 19.

[0119] Referring to FIGS. 19 and 20, the front lamp (850) of a moving body or vehicle (900) may include one or more lighting modules, and by individually controlling the driving timing of these lighting modules, it may provide not only the function of a normal headlight but also additional functions such as a welcome light or a celebration effect when the driver opens the vehicle door. The lamp may be applied as a daytime running light, high beam, low beam, fog light, or turn signal.

[0120] In a vehicle (900), the taillight (800) may be configured with a plurality of lamp units (810, 812, 814, 816) supported by a housing (801). For example, the lamp units (810, 812, 814, 816) may include a first lamp unit (810) configured on the outside, a second lamp unit (814) configured around the inner circumference of the first lamp unit (810), and third and fourth lamp units (814, 816) configured respectively on the inside of the second lamp unit (814). The first to fourth lamp units (810, 812, 814, 816) may optionally be equipped with the lighting device disclosed in the embodiment, and a red lens cover or a white lens cover may be configured on the outside of the lighting device to provide lighting characteristics for the lamp units (810, 812, 814, 816). The lighting device disclosed in the embodiment applied to the above lamp units (810, 812, 814, 816) can emit surface light with a uniform distribution.

[0121] The first and second lamp units (810, 812) may be provided with at least one of a curved shape, a straight shape, an angular shape, an inclined shape, or a planar shape, or a structure mixed thereof. The first and second lamp units (810, 812) may be arranged in one or multiple units in each taillight. The first lamp unit (810) may be provided as a taillight, the second lamp unit (812) may be provided as a brake light, the third lamp unit (814) may be provided as a reverse light, and the fourth lamp unit (816) may be provided as a turn signal lamp. The structure and location of these lighting lamps may be changed.

[0122] 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 those 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. In addition, although the above description has focused on embodiments, this is merely illustrative and does not limit the present invention; those skilled in the art to which the present invention belongs will understand that various modifications and applications not exemplified above are possible within the scope that does not deviate from the essential characteristics of the embodiments. For example, each component specifically shown in the embodiments may be modified and implemented. Furthermore, differences related to such modifications and applications should be interpreted as being included within the scope of the present invention as defined in the appended claims. Explanation of the symbols

[0123] 100,111,112,113,115: light-emitting element 201,202,203,204: Light-emitting part 210: Substrate 220: Resin layer 230: Reflective layer 240: Reflective element 200: Lighting device S1-S4: Side

Claims

Claim 1 A lighting device comprising: a substrate; a plurality of light-emitting elements disposed on the substrate; a resin layer covering the plurality of light-emitting elements; and a reflective member disposed on the resin layer, wherein the resin layer has first and second sides disposed on both sides of a first direction and third and fourth sides disposed on both sides of a second direction orthogonal to the first direction, and the length of the second direction of the resin layer is longer than the length of the first direction, and the plurality of light-emitting elements include a plurality of first light-emitting elements disposed in a first row along the first side and a plurality of second light-emitting elements disposed in a second row along the second side, wherein the plurality of first light-emitting elements have a plurality of first groups in which five or fewer are periodically disposed, and the plurality of second light-emitting elements have a plurality of second groups in which five or fewer are periodically disposed, and the first light-emitting elements and the second light-emitting elements emit light in opposite directions. Claim 2 A lighting device according to claim 1, wherein the plurality of first light-emitting elements emit light toward the third side of the resin layer, and the plurality of second light-emitting elements emit light toward the fourth side of the resin layer. Claim 3 A lighting device according to claim 1, wherein the plurality of first light-emitting elements emit light toward opposite third and fourth sides from the center between the first to fourth sides of the lighting device, and the plurality of second light-emitting elements emit light toward the center between the first to fourth sides of the lighting device. Claim 4 A lighting device according to claim 1, wherein the plurality of first light-emitting elements emit light toward the third or fourth side of the resin layer, and the plurality of second light-emitting elements emit light toward the first side of the resin layer. Claim 5 In any one of claims 1 to 4, the resin layer is a lighting device that emits light through the first side. Claim 6 A lighting device comprising: a substrate; a plurality of light-emitting elements disposed on the substrate; a resin layer covering the plurality of light-emitting elements; and a reflective member disposed on the resin layer, wherein the resin layer has first and second sides disposed on both sides of a first direction and third and fourth sides disposed on both sides of a second direction orthogonal to the first direction, and the length of the second direction of the resin layer is longer than the length of the first direction, and the plurality of light-emitting elements include a plurality of first light-emitting elements disposed in a first row along the first side and a plurality of second light-emitting elements disposed in a second row along the second side, wherein the plurality of first light-emitting elements have a plurality of first groups in which five or fewer are periodically disposed, and the plurality of second light-emitting elements have a plurality of second groups in which five or fewer are periodically disposed, and the first light-emitting elements and the second light-emitting elements emit light in the same direction. Claim 7 In claim 6, the first light-emitting elements and the second light-emitting elements are a lighting device that emits light toward the first side of the resin layer. Claim 8 In claim 6, the lighting device comprises a concave coupling groove on the first side of the lighting device, each in the area between the first group.

Images