Lighting module, lighting device, and indicator lamp

Abstract

A lighting device according to an embodiment of the invention comprises: a substrate; a plurality of light source units arranged on the substrate in a first direction and a second direction that are different from each other; first partition walls disposed around each of the plurality of light source units; second partition walls disposed on the first partition walls and having holes in which the plurality of light source units are respectively arranged; and a diffusion member disposed on the plurality of light source units and the second partition walls. The thickness of the first partition walls may be greater than or equal to the thickness of the light source units on the basis of the upper surface of the substrate, and the thickness of the second partition walls may be greater than the thickness of the light source units and the thickness of the first partition walls.

Description

Lighting modules, lighting devices and indicator lamps

[0001] The embodiments relate to lighting modules, lighting devices and lamps having a light source.

[0002] Lighting applications include not only vehicle lighting, but also displays and signage lighting. Semiconductor light-emitting devices, such as light-emitting diodes (LEDs), offer advantages over conventional light sources like fluorescent and incandescent lamps, including low power consumption, a near-permanent lifespan, fast response times, safety, and environmental friendliness. These LEDs are used in various lighting devices, including displays, indoor and outdoor lighting. Recently, lamps using LEDs have been proposed as vehicle light sources. Compared to incandescent lamps, LEDs offer the advantage of lower power consumption. Furthermore, their compact size allows for greater design flexibility, and their near-permanent lifespan makes them economical.

[0003] In order to implement display devices or display lamps using these semiconductor light-emitting devices, a large number of semiconductor light-emitting devices are required. Recently, research is being conducted to apply semiconductor light-emitting devices to lighting, display devices, or display lamps using micro-sized LEDs. Here, the chip size of the micro-sized LED is 100 micrometers or less, and includes a mini-sized LED, and the mini-sized LED chip size can range from about 100 to 500 micrometers.

[0004] However, since light-emitting diodes have the highest luminous intensity along the optical axis, hot spots may occur along the optical axis, and the uniformity of light may deteriorate in the area between adjacent light-emitting diodes. Furthermore, research is needed on display lamps that utilize tens to hundreds of light-emitting diodes to more clearly display characters or symbols.

[0005] Embodiments of the invention provide lighting modules, lighting devices and lamps having a plurality of pixels.

[0006] Embodiments of the invention provide a lighting module, a lighting device and a lamp capable of improving the light uniformity of each pixel and eliminating hot spots.

[0007] Embodiments of the invention provide lighting modules, lighting devices and lamps having double baffles to prevent optical interference or color mixing between adjacent pixels.

[0008] An embodiment of the invention can provide a vehicle indicator lamp using a lighting device having pixels.

[0009] A lighting device according to an embodiment of the invention comprises: a substrate; a plurality of light source units arranged in first and second directions on the substrate; and a first partition wall arranged around each of the plurality of light source units; a second partition wall having a hole in which each of the plurality of light source units is arranged and arranged on the first partition wall; and a diffusion member arranged on the plurality of light source units and the second partition wall, wherein each of the plurality of light source units has at least one light emitting element, and a thickness of the first partition wall may be greater than or equal to a thickness of the light source unit based on an upper surface of the substrate, and a thickness of the second partition wall may be thicker than a thickness of the light source unit and a thickness of the first partition wall.

[0010] According to an embodiment of the invention, the second bulkhead may have a concave groove on the bottom between the opposite side surfaces, and the first bulkhead may be arranged along the groove of the second bulkhead. According to an embodiment of the invention, the second bulkhead may have a lattice shape.

[0011] According to an embodiment of the invention, the first partition wall can be in contact with the surface of the groove. The second partition wall has first and second side surfaces that are opposite to each other, a first groove that is concave on the lower portion of the first side surface, and a second groove that is concave on the lower portion of the second side surface, the first groove and the second groove being arranged around adjacent light source portions, and the first partition wall can be arranged in each of the first groove and the second groove.

[0012] According to an embodiment of the invention, the second bulkhead includes a support portion arranged between the first and second grooves, and a bottom width of the support portion may be larger than a bottom width of the first bulkhead arranged in each of the first and second grooves.

[0013] According to an embodiment of the invention, a portion of the second bulkhead may protrude further outward than the first and second side surfaces of the second bulkhead.

[0014] According to an embodiment of the invention, it may include a reflective layer bonded between the second partition wall and the substrate, and an adhesive member disposed between the second partition wall and the diffusion member.

[0015] According to an embodiment of the invention, the reflective layer may extend further into a region between the second barrier rib and the light source unit on the substrate. The first barrier rib and the second barrier rib may be in contact with a surface of the substrate.

[0016] A lighting device according to an embodiment of the invention comprises: a substrate; a plurality of light source units arranged in first and second directions that are different from each other on the substrate; and a plurality of first partition walls arranged around each of the plurality of light source units; a second partition wall having a hole in which each of the plurality of light source units is arranged and arranged around each of the plurality of first partition walls; and a diffusion member arranged on the plurality of light source units and the second partition wall, wherein each of the plurality of light source units has at least one light-emitting element, and a thickness of the first partition wall may be less than a thickness of the light source unit based on an upper surface of the substrate, and a thickness of the second partition wall may be thicker than a thickness of the light source unit.

[0017] According to an embodiment of the invention, the thickness of the light-emitting element is T0, the thickness of the first partition wall is a, the minimum distance between the upper end of the first partition wall and the light-emitting element adjacent to the first partition wall is d, and the minimum distance between the second partition wall and the light-emitting element is k, and conditional expression 1: k:TO = (kd): a can be satisfied.

[0018] According to an embodiment of the invention, in the above conditional expression 1, if d < T0, then conditional expression 2: 0.7 < a / TO < 0.8 can be satisfied. In the above conditional expressions 1 and 2, d and T0 can satisfy 0.5 < d / TO < 1.

[0019] According to an embodiment of the invention, in the above conditional expression 1, if T0 < d, then conditional expression 3: 0.4 < b / TO < 0.55 can be satisfied. In the above conditional expressions 1 and 3, d and T0 can satisfy 1 < d / TO < 1.5.

[0020] According to an embodiment of the invention, in the above conditional expression 1, if TO < d, then conditional expression 4: 0.1 < c / TO < 0.3 can be satisfied. In the above conditional expressions 1 and 4, d and T0 can satisfy 1.7 < d / TO < 2.3.

[0021] According to an embodiment of the invention, the diffusion member includes a light blocking layer disposed at the bottom and a diffusion layer disposed at the top, the light blocking layer is formed of a metal material and has a plurality of through holes therein, and the density of an area overlapping the light source portion of the plurality of through holes may be lower than the density of an area adjacent to the second partition wall.

[0022] According to an embodiment of the invention, the area where each of the plurality of light sources is arranged is a pixel area, and the lighting device is coupled to a vehicle and can display an image or information having a sign, character, or symbol through the plurality of pixel areas. According to an embodiment of the invention, an adhesive member arranged between the second bulkhead and the diffusion member may be included.

[0023] According to an embodiment of the invention, optical interference between adjacent pixels can be blocked, thereby improving the contrast ratio of displayed information. In addition, light leakage into adjacent pixels can be blocked, thereby preventing a decrease in the brightness of pixels and improving light uniformity. In addition, a lighting module or lighting device can be made lighter and slimmer. In addition, by providing pixel illumination, the visibility of information such as symbols or characters displayed by pixels from the outside can be improved. In addition, an embodiment of the invention can provide an illuminated image in various forms, and can improve the optical reliability of a lighting module and a vehicle lamp having the same. An embodiment of the invention can be applied to a light unit having a lighting module, or an external or internal lighting lamp.

[0024] Figure 1 is an exploded perspective view of a lighting device according to a first embodiment of the invention.

[0025] Fig. 2 is a partial plan view showing the combination of the lighting device of Fig. 1.

[0026] Figure 3 is a side cross-sectional view of the lighting device of Figure 1.

[0027] Fig. 4 is a plan view showing an example of the arrangement of the partition walls and light-emitting elements of the unit pixels in the lighting device of Fig. 2.

[0028] Figure 5 is an example of a side cross-section of a unit pixel of Figure 4.

[0029] Figure 6 is another example of the unit pixel of Figure 5.

[0030] Fig. 7 is a drawing showing the detailed configuration of the diffusion member in the unit pixel of Fig. 6.

[0031] Fig. 8 is a cross-sectional view showing an example of a partition wall and a light shield according to the first embodiment of the invention.

[0032] FIG. 9 is a partial cross-sectional view of a unit pixel of a lighting device according to a first embodiment of the invention, showing an adhesive layer and a reflective layer.

[0033] FIG. 10 is a partial cross-sectional view of a unit pixel of a lighting device according to a first embodiment of the invention, showing different combination forms of a substrate, a light-shielding portion, and a partition wall.

[0034] Fig. 11 is a partial cross-sectional view of a unit pixel of a lighting device according to a first embodiment of the invention, and is another example of a light-shielding portion.

[0035] Fig. 12a is another example of the lighting device of Fig. 3.

[0036] Figure 12b is an example of a double barrier rib arranged on a substrate in the first embodiment of the invention.

[0037] FIG. 12c is an example of a first embodiment of the invention in which a light blocking protrusion is provided on the second bulkhead.

[0038] Fig. 13 is an example of a plan view of a lighting device according to a second embodiment of the invention.

[0039] Figure 14 is an example of a plan view of a unit pixel of Figure 13.

[0040] Figure 15 is an example of a cross-sectional side view of a unit pixel of Figure 14.

[0041] Figures 16 and 17 are other examples of the shade of Figure 15.

[0042] FIG. 18 is a drawing showing another example of the unit pixel of FIG. 15, showing another bond between the bulkhead and the shading portion and the substrate.

[0043] Fig. 19 is a plan view of a unit pixel of a lighting device according to a third embodiment of the invention.

[0044] Fig. 20 is an example of a cross-sectional side view of a unit pixel of Fig. 19.

[0045] Figures 21 and 22 are examples of changing the position of the shade part of Figure 20.

[0046] Fig. 23a is another example of the shade of Fig. 22.

[0047] Fig. 23b is another example of the first bulkhead of Fig. 22.

[0048] Figure 24 is a drawing showing another combination of the bulkhead and the substrate of Figure 23a.

[0049] Fig. 25 is a plan view of a unit pixel of the lighting device of Fig. 19 having a double shading part.

[0050] Figure 26 (a) shows another arrangement form of light-emitting elements within a unit pixel in an embodiment of the invention, and (b) shows an arrangement form in which the number of light-emitting elements is increased.

[0051] Fig. 27 is a plan view of a vehicle to which a lighting device according to an embodiment of the invention is applied.

[0052] Fig. 28 is an example of a display device coupled to the vehicle of Fig. 27.

[0053] Figures 29 (a) and (b) are examples of displaying symbols or characters using the display device of Figure 28.

[0054] Hereinafter, preferred embodiments of the invention will be described in detail with reference to the attached drawings.

[0055] The technical idea of ​​the present invention is not limited to some of the embodiments described, but can be implemented in various different forms, and within the scope of the technical idea of ​​the present invention, one or more of the components between the embodiments can be selectively combined or substituted and used. In addition, the terms (including technical and scientific terms) used in the embodiments of the present invention can be interpreted as having a meaning that can be generally understood by a person of ordinary skill in the technical field to which the present invention belongs, unless explicitly and specifically defined and described, and the meaning of commonly used terms, such as terms defined in a dictionary, can be interpreted in consideration of the contextual meaning of the related technology. In addition, the terminology used in the embodiments of the present invention is for the purpose of describing the embodiments and is not intended to limit the present invention. In this specification, the singular may also include the plural unless specifically stated in the phrase, and when it is described as "A and (or at least one (or more than one) of B, C," it may include one or more of all combinations that can be combined with A, B, and C. In addition, when describing components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only intended to distinguish the components from other components, and the nature, order, or sequence of the components are not determined by the terms. In addition, when it is described that a component is 'connected', 'coupled', or 'connected' to another component, the component may include not only cases where the component is directly connected, coupled, or connected to the other component, but also cases where the component is 'connected', 'coupled', or 'connected' by another component between the component and the other component.Additionally, when it is described as being formed or arranged "above or below" each component, "above" or "below" includes not only cases where the two components are in direct contact with each other, but also cases where one or more other components are formed or arranged between the two components. Furthermore, when it is expressed as "above" or "below", it can include the meaning of a downward direction as well as an upward direction based on one component.

[0056] The lighting device according to the 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 head lamps, side mirror lights, side marker lights, fog lights, tail lamps, brake lights, daytime running lights, vehicle interior lighting, door scuffs, rear combination lamps, backup lamps, etc. The lighting device of the present invention can also be applied to indoor and outdoor advertising devices, display devices, and various types of electric vehicles, and in addition, it can be applied to all lighting-related fields or advertising-related fields that are currently developed and commercialized or can be implemented in accordance with future technological developments.

[0057]

[0058] FIG. 1 is an exploded perspective view of a lighting device according to a first embodiment of the invention, FIG. 2 is a partial plan view showing the combination of the lighting device of FIG. 1, FIG. 3 is a side cross-sectional view of the lighting device of FIG. 1, FIG. 4 is a plan view showing an example of the arrangement of partition walls and light-emitting elements of a unit pixel in the lighting device of FIG. 2, FIG. 5 is an example of a side cross-section of a unit pixel of FIG. 4, FIG. 6 is another example of the unit pixel of FIG. 5, FIG. 7 is a drawing showing a detailed configuration of a diffusion member in the unit pixel of FIG. 6, and FIG. 8 is a cross-sectional view showing an example of a partition wall and a light-shielding portion according to the first embodiment of the invention.

[0059] Referring to FIGS. 1 to 8, a lighting device (1000) may include a substrate (100), a display area (110) having a light source unit (120) disposed on the substrate (100), partition walls (200, 300) disposed around each of pixel areas (111) having the light source unit (120) on the substrate (100), and a diffusion member (500) disposed on the pixel area (111).

[0060] The lighting device (1000) may have a plurality of pixel areas (111) arranged in a first direction (X) and a second direction (Y), and at least one light source unit (120) may be arranged in each pixel area (111). The lighting device (1000) displays an image or information such as a sign, logo, symbol, or character by the light source units (120) arranged in each pixel area (111), and may be defined as a lighting module or a display lamp. The lighting device (1000) displays an image or information such as a sign, logo, symbol, or character through the display area (110). In addition, the lighting device (1000) may be implemented as pixel lighting by using the pixel areas (111).

[0061] The above lighting device (1000) controls the operation of the light source unit (120) within the pixel area (111) through a control unit (not shown) according to the image or information to be displayed, and displays the image or information by the light extracted through the pixel area (111) by turning on or off the light source unit (120). The light source unit (120) arranged within the pixel area (111) is turned on or off depending on whether power is supplied. The pixel area (111) may be implemented as a grid type or a unit cell type, and may function as a pixel, which is the smallest unit constituting an image or information. The pixel area (111) may be defined as a unit pixel or a unit light emitting unit. The top view shape of the pixel area (111) may be a polygonal shape such as a square shape or a triangular shape, or may be provided as circular or elliptical shapes. The top view shape of the display area (110) having the pixel areas (111) may be a polygonal shape such as a triangle or a square, or a circular shape or an oval shape. The top view shape of the display area (110) having the pixel areas (111) may have a shape such as a sign, logo, symbol, or character.

[0062]

[0063] The substrate (100) may include a printed circuit board (PCB). The substrate (100) may include, for example, at least one of a resin-based printed circuit board (PCB), a metal core PCB, a flexible PCB, a ceramic PCB, or an FR-4 substrate. When the substrate (100) is a flexible PCB, the lighting device (1000) may have a flexible characteristic. The length of the substrate (100) in the first and second directions (X, Y) may be greater than the length of the display area (110) in the first and second directions (X, Y). One or more display areas (110) may be arranged within the substrate (100), and when a plurality of display areas (110) are arranged, they may be arranged in the first direction (X) and / or the second direction (Y). The substrate (100) has one or more coupling holes (119), and the lighting device (1000) can be coupled to a bracket (not shown) through the coupling holes (119) using a coupling means (not shown).

[0064]

[0065] The substrate (100) may be electrically connected to the plurality of light source units (120). The substrate (100) includes a wiring layer (101, see FIG. 10) on the upper portion, and the wiring layer (101, see FIG. 10) may be electrically connected to the plurality of light source units (120). The substrate (100) may be a single-layer substrate having a single wiring layer or a multi-layer substrate having a plurality of wiring layers. Referring to FIG. 10, when the substrate (100) is a single-layer substrate, the substrate (100) may have a protective layer (102) disposed on the upper surface of the wiring layer (101), an insulating layer (104) disposed on the lower surface of the wiring layer (101), and a layer (103) of a metal material disposed under the insulating layer (104). When the substrate (100) is a multilayer substrate, the substrate (100) may have a protective layer (102) disposed on the upper surface of the upper wiring layer (101), an insulating layer (104) disposed on the lower surface of the upper wiring layer (101), and a layer (103) for lower wiring disposed under the insulating layer (104), and the layer (103) for lower wiring may be connected to the upper wiring layer (101) through a via. The protective layer (102) of the substrate (100) is a layer for protecting the wiring layer (101) and may be formed of a solder resist material or a reflective material. The color of the reflective material may be provided as white.

[0066]

[0067] The light source unit (120) emits the highest light in the third direction (Z) or the optical axis direction. The third direction (Z) is a direction orthogonal to the first and second directions (X, Y), and is a direction from the substrate (100) toward the diffusion member (500). The light source unit (120) is mounted on the substrate (100) and may be provided as an LED chip or a package that covers the surface of the LED chip with resin. The light source unit (120) is a light-emitting element having a light-emitting diode chip (LED Chip), and may include various forms such as a package in which a light-emitting diode chip is packaged, a Filp-chip, a CSP (Chip scale package), etc. The light-emitting diode chip may emit at least one of blue, red, green, ultraviolet (UV), or infrared, and the light source unit (120) may emit at least one of white, blue, red, green, or infrared, and may emit light in a color such as, for example, white, blue, or green. The thickness (T0) or height of the light source unit (120) may be 0.4 mm or less or in the range of 0.25 mm to 0.4 mm. The light emitting element (121, 122) of the light source unit (120) includes a mini LED chip or a micro LED chip.

[0068]

[0069] The light source unit (120) may be arranged in one or more pixel areas (111). The light source unit (120) may include a first light emitting element (121) and a second light emitting element (122) arranged in the pixel areas (111). The first and second light emitting elements (121, 122) may emit different colors. For example, the first light emitting element (121) may emit white light, and the second light emitting element (122) may emit red light. As another example, the first light emitting element (121) may emit yellow light, and the second light emitting element (122) may emit red light, or the first light emitting element (121) may emit white light, and the second light emitting element (122) may emit yellow light. As another example, the first and second light-emitting elements (121, 122) may emit different colors from among blue, green, red, yellow, and white. As another example, the first and second light-emitting elements (121, 122) may emit the same color from among blue, green, red, yellow, and white. Here, the blue, green, red, yellow, and white may include wavelength bands of each color or may include similar colors.

[0070] The first and second light-emitting elements (121, 122) may include a light-emitting diode chip and a phosphor layer, and the phosphor layer may be laminated on the surface of the light-emitting diode chip. The phosphor layer may include at least one or two or more of a yellow phosphor, a red phosphor, a red phosphor, or a green phosphor. The phosphor layer may include a wavelength conversion material such as a quantum dot. Each of the first and second light-emitting elements (121, 122) may emit blue, green, red, yellow, or white through mixing light generated from the light-emitting diode chip and light wavelength-converted by the phosphor layer. At least one or both of the first and second light-emitting elements (121, 122) may be mounted on the substrate (100) in a flip chip manner, and may emit light on at least five sides. The at least five sides may be a top surface and four side surfaces. As another example, the first and second light-emitting elements may include a top-view LED package.

[0071]

[0072] The lighting device (1000) can have the first and second light-emitting elements (121, 122) emit the same color or different colors within the pixel area (111). Accordingly, images or information having various colors can be displayed through the display area (110). The lighting device (1000) can have the first and second light-emitting elements (121, 122) turned on or off simultaneously, or turned on or off individually. Preferably, the first and second light-emitting elements (121, 122) can be driven individually.

[0073] Within each pixel area (111), the first and second light-emitting elements (121, 122) may be arranged in a first direction (X), a second direction (Y), or a diagonal direction as in (a) of FIG. 26. Alternatively, as in (b) of FIG. 26, when each pixel area (111) has three light-emitting elements (121A, 121B, 121C), they may be arranged in a triangular shape. As in (c) of FIG. 26, a single light-emitting element may be provided within each pixel area (111). As another example, pixel areas arranged at the edges or corners of the lighting device may have a smaller or larger number of light-emitting elements than the number of light-emitting elements within pixel areas arranged at the center.

[0074] Each of the pixel areas (111) may include a partition wall (200, 300) around its periphery. The partition wall (200, 300) is a light-blocking member that covers the outer side of each of the pixel areas (111) and may have a multi-partition wall structure or a double light-blocking structure. The multi-partition wall (200, 300) may be arranged in two or three layers based on the light source unit (120). Accordingly, the multi-partition wall (200, 300) can block light interference between adjacent light-emitting elements (121, 122) and prevent light from penetrating into adjacent pixel areas (111). In addition, the contrast ratio of the pixel areas (111) can be improved by the multi-partition wall (200, 300) and a decrease in brightness can be prevented.

[0075] The upper ends of each of the multiple partition walls (200, 300) may have different heights relative to the upper surface of the substrate (100). Each of the adjacent light-emitting elements (121, 122) may be arranged in an area where the distance between the side surfaces of each of the light-emitting elements (121, 122) and the inner surface of each of the multiple partition walls (200, 300) is equal to or different from each other.

[0076]

[0077] The above multiple partition walls (200, 300) may include a first partition wall (200) and a second partition wall (300). The first partition wall (200) may be disposed on the substrate (100), and the second partition wall (300) may be disposed on the substrate (100) and the first partition wall (200).

[0078] The first partition wall (200) includes a plurality of first holes (205), and the plurality of first holes (205) can be arranged in a form in which the pixel areas (111) are arranged. Each of the plurality of first holes (205) can have a size corresponding to the pixel area (111). The second partition wall (300) has a plurality of second holes (301), and the plurality of second holes (301) can be arranged in a form in which the pixel areas (111) are arranged. The plurality of second holes (301) are arranged in an area corresponding to each of the first holes (205) and can have a size corresponding to the pixel area (111). Here, the corresponding area or size means an area that at least partially overlaps in the third direction (Z) or the size of the overlapping area.

[0079] The first partition wall (200) may have a lattice shape due to the plurality of first holes (205). The second partition wall (300) may have a lattice shape due to the plurality of second holes (301). The sizes of the first and second holes (205, 301) may be different from each other. For example, the bottom size of the first hole (205) may be larger than the bottom size of the second hole (301). The top view shape of the first hole (205) may be a polygonal shape having a triangular or square shape. The top view shape of the second hole (301) may be a polygonal shape having a triangular or square shape. Here, the polygonal shape may include a shape with an angular corner or a curved shape.

[0080] The first partition wall (200) includes a resin material, and may include, for example, a silicone or epoxy material. The second partition wall (300) includes a metal material or a resin material, and the metal material may be at least one or an alloy of two or more of aluminum (Al), nickel (Ni), copper (Cu), and silver (Ag), and the resin material may include an epoxy or silicone material. As another example, at least one of the first and second partition walls (200, 300) may be selected from materials such as polyimide (PI), polyurethane (PU), polyvinyl chloride (PVC), polypropylene (PP), polyethylene (PE), and polyethylene terephthalate (PET). The first and second partition walls (200, 300) may be formed in a single layer or multiple layers.

[0081]

[0082] The above first bulkhead (200) may include a light reflecting material or a light absorbing material within the resin material, and the light reflecting material may be Al2O3, TiO2, It may include at least one of SiO2, ZnO, and ZrO2, and the light absorbing material may include a light absorbing pigment or dye. When the second partition wall (300) is formed of a resin material, it may include a light absorbing material or a light reflecting material inside. The first partition wall (200) and the second partition wall (300) may be formed of different materials. For example, when the first partition wall (200) is formed of an epoxy material, the second partition wall (300) may be formed of a silicone material. When the first partition wall (200) is formed of a silicone material, the second partition wall (300) may be formed of an epoxy material. Separately, the first partition wall (200) and the second partition wall (300) may be formed of the same material.

[0083] As shown in Fig. 8, the first partition wall (200) may be arranged within a lower region of the second partition wall (300). The first partition wall (200) may be arranged between the substrate (100) and the second partition wall (300). Accordingly, the first partition wall (200) may function as a double partition wall within the second partition wall (300). The side cross-sectional shape of the second partition wall (300) may be a shape in which a bottom width (W1) is wider than a top width (W2), and may be a polygonal shape having, for example, a square shape or a trapezoidal shape. As another example, as shown in Fig. 12A, the inner side of the outer partition wall (300A) arranged at the outermost part of the display area (110) may be provided without the first partition wall (200). That is, since the outer second bulkhead (300A) positioned at the outermost side of the second bulkhead (300) does not have a pixel area on the outside, there is no need to provide a first bulkhead at the bottom of the outer second bulkhead (300A).

[0084] The upper surface width (W2) of the second partition wall (300) is the minimum distance between adjacent pixel areas (111) and may be 1.1 mm or less, for example, in the range of 0.5 mm to 1.1 mm or in the range of 0.7 mm to 1 mm. If the upper surface width (W2) is larger than the above range, the dark area between pixels may increase, and if it is smaller than the above range, light leakage may occur or manufacturing may be difficult.

[0085]

[0086] The top height (T2) of the first partition wall (200) may be equal to or greater than the thickness (T0) or the top surface height of the light source unit (120) based on the top surface of the substrate (100). The thickness (T0) of the light source unit (120) is the top surface height of the element having a thicker thickness among the first and second light-emitting elements (121, 122). The top height (T2) or thickness of the first partition wall (200) may be equal to or less than 0.6 mm or equal to or less than 0.55 mm, and may be greater than the thickness (T0) of the light source unit (120). The first partition wall (200) may absorb or reflect light emitted through the first and second light-emitting elements (121, 122).

[0087] The second partition wall (300) has a groove (311) at the bottom, and the groove (311) is formed concavely from the lower surface of the second partition wall (300) toward the upper surface, extends in the first and second directions (X, Y), and may have a shape corresponding to the lattice shape of the first partition wall (200). The height (T1) of the groove (311) may be deeper than the upper height (T2) of the first partition wall (200) based on the upper surface of the substrate (100). The side cross-sectional shape of the groove (311) may be a shape in which the bottom width is wider than the top width, and may be, for example, a semicircular shape, a semi-elliptical shape, or a polygonal shape. The side cross-sectional shape of the first partition wall (200) may be a shape in which the bottom width is wider than the top width, and may be, for example, a semicircular shape, a semi-elliptical shape, or a polygonal shape. In addition, the side cross-sectional shape of the first bulkhead (200) and the groove (311) may be formed in a form in which the width of one area is constant based on the upper surface of the substrate (100) and then becomes narrower as it goes upward.

[0088]

[0089] The lower surface of the first partition wall (200) may be in contact with the upper surface of the substrate (100). The lower surface (S3) of the second partition wall (300) may be spaced apart from the upper surface of the substrate (100). As another example, as shown in FIG. 12b, the lower surface (S3) of the second partition wall (300) may be in contact with the upper surface of the substrate (100).

[0090] As shown in FIGS. 8 to 10, at least one of one side surface and the other side surface of the first partition wall (200) may be in contact with the side surface of the groove (311) of the second partition wall (300). A space may be created between the upper surface of the first partition wall (200) and the inner upper surface of the groove (311) of the second partition wall (300), and the spaced space may exist as an air gap. One side surface of the first partition wall (200) is an inner side surface or an opposite side surface of the other side surface with respect to the first partition wall (200). The other side surface of the first partition wall (200) is an outer side surface or an opposite side surface of the one side surface with respect to the first partition wall (200). Accordingly, the bottom width of the groove (311) of the second partition wall (300) may be equal to or greater than the bottom width (W4) of the first partition wall (200). When the first bulkhead (200) is coupled in a form in which it is fitted into the groove (311) of the second bulkhead (300), the lower portion of the second bulkhead (300) can be supported. When the bottom width of the groove (311) of the second bulkhead (300) is greater than the bottom width (W4) of the first bulkhead (200), the inner side or the other side of the first bulkhead (200) may not come into contact with the groove of the second bulkhead (300). The difference between the bottom width of the groove (311) of the second bulkhead (300) and the bottom width (W4) of the first bulkhead (200) may be 0.1 mm or less. If the difference between the bottom width of the groove (311) of the second partition wall (300) and the bottom width (W4) of the first partition wall (200) is greater than the above range, a light leakage phenomenon may occur in the area between the first and second partition walls (200, 300), and if it is greater than the above range, the width of the first and second partition walls (200, 300) may increase and the dark area between pixels may increase.

[0091]

[0092] The minimum distance (W3) between the lower end of the first side (S1) of the second bulkhead (300) and the first bulkhead (200) may be smaller than the bottom width (W4) of the first bulkhead (200). The minimum distance (W5) between the lower end of the second side (S2) of the second bulkhead (200) and the first bulkhead (200) may be smaller than the bottom width (W4) of the first bulkhead (200). The first side (S1) and the second side (S2) of the second bulkhead (300) are one side and the other side, and are opposite sides. Here, the sum of the minimum distances (W3, W5) may be larger than the bottom width (W4) of the first bulkhead (200). The minimum distance (W3, W5) between the first and second side surfaces (S1, S2) of the second bulkhead (300) and the first bulkhead (200) may be 0.4 mm or less, for example, in the range of 0.2 mm to 0.4 mm. If it is smaller than the range, it may be difficult to form the lower groove (311) of the second bulkhead (300), and if it is larger than the range, it may be difficult to manufacture the first bulkhead (200) or the light-blocking function may be reduced.

[0093] The bottom width (W4) of the first bulkhead (200) may be 0.5 times or less, for example, in the range of 0.4 to 0.5 times, the bottom width (W1) of the second bulkhead (300). The bottom width (W4) of the first bulkhead (200) may be 0.6 mm or less, for example, in the range of 0.45 mm to 0.6 mm or in the range of 0.5 mm to 0.6 mm. The bottom width (W1) of the second bulkhead (300) may be 1 mm or more, for example, in the range of 1 mm to 1.5 mm or in the range of 1 mm to 1.4 mm. Accordingly, the first partition wall (200) supports the lower portion of the second partition wall (300) along the lower groove (311) of the second partition wall (300) and can block light leakage through the area between the substrate (100) and the second side wall (300).

[0094] The first and second side surfaces (S1, S2) of the second partition wall (300) may have a first angle (R1) with respect to the upper surface of the substrate (100) for light reflection. The first angle (R1) may be 91 degrees or more, for example, in the range of 91 to 95 degrees or 92 to 94 degrees. If the first angle (R1) is greater than the above range, light emitted through the pixel area (111) may propagate toward an adjacent pixel area, thereby lowering pixel brightness. If the first angle (R1) is less than the above range, light extraction efficiency may be lowered.

[0095]

[0096] The first partition wall (200) may be formed in a grid shape on the upper surface of the substrate (100), and then the pre-manufactured second partition wall (300) may be placed on the substrate (100), and the first partition wall (200) may be coupled to the lower groove (311) of the second partition wall (300). As another example, a transparent resin layer (not shown) that seals the light-emitting elements (121, 122) may be formed within the pixel area (111), and the resin layer may protect the light-emitting elements (121, 122) from moisture.

[0097] The second partition wall (300) may be spaced apart from the upper surface of the substrate (100). The reflective layer (115) may be disposed in a region between the second partition wall (300) and the substrate (100). The reflective layer (115) may function as an adhesive layer having a reflective material. The reflective layer (115) may fix the lower surface (S3) of the second partition wall (300) to the substrate (100). As another example, the reflective layer (115) may be disposed on the surface of the first partition wall (200), in which case the reflective layer (115) may adhere the surface of the groove (311) of the second partition wall (300) and the surface of the first partition wall (200).

[0098] As shown in Fig. 6, the reflective layer (115) may extend to the peripheral region of the first and second light-emitting elements (121, 122) in order to reflect light incident from the upper surface of the substrate (100). The reflective layer (115) may be further disposed below the region between the second partition wall (300) and the light-emitting elements (121, 122).

[0099] The above reflective layer (115) may be made of a material such as silicone or epoxy, or may be a primer material. The reflective layer (115) is attached to the surface of the substrate (115) and may include a reflective material inside. The reflective material may be Al2O3, TiO2, It may include at least one of SiO2, ZnO, and ZrO2. The reflective layer (115) is bonded after forming the first partition wall (200) on the substrate (100), and the pre-manufactured second partition wall (300) may be bonded on the reflective layer (115). Accordingly, the lower portion of the second partition wall (300) may be firmly fixed to the substrate (100). The reflective layer (115) may be in contact with both side surfaces of the first partition wall (200). Since the reflective layer (115) is in contact with the first partition wall (200) and the second partition wall (300), light leakage between adjacent pixel areas (111) may be prevented. The reflective layer (115) may be removed when the second partition wall (300) is integrally molded on the substrate (100). That is, as shown in Fig. 12c, the second partition wall (300) can be molded on the upper surface of the substrate (100) and arranged around each pixel area (111). In this structure, the process of separately attaching the second partition wall (300) can be reduced, and assembly tolerance can be improved.

[0100]

[0101] An adhesive member (400) is bonded between the second partition wall (300) and the diffusion member (500). The adhesive member (400) may be an adhesive or a double-sided tape, and may be an adhesive film made of silicone or PET (Polyethylene terephthalate). The adhesive member (400) may be provided to be thinner than the thickness of the diffusion member (500). The adhesive member (400) may be removed. As shown in Fig. 1, the adhesive member (401) may have an opening area (401) corresponding to the second hole (301).

[0102] The diffusion member (500) may be disposed on the display area (110). The diffusion member (500) may be disposed on the second partition wall (300) and the pixel areas (111). The diffusion member (500) may be fixed to the second partition wall (300) by the adhesive member (400). The diffusion member (500) provides light extracted through each of the pixel areas (111) as a pixel light source with a uniform distribution. The diffusion member (500) may include a single-layer or multi-layer structure.

[0103]

[0104] As shown in Fig. 7, when the diffusion member (500) has a multi-layer structure, it may be implemented with two or three layers. The diffusion member (500) may include a light blocking layer (511) and a diffusion layer (521), and the diffusion layer (521) may be disposed on the light blocking layer (511). As another example, the diffusion layer (521) may be disposed on the upper surface and / or the lower surface of the light blocking layer (511). As another example, the light blocking layer (511) may be disposed on the upper surface and / or the lower surface of the diffusion layer (521). The light blocking layer (511) may be formed of a metal material, for example, a metal material having aluminum. The light blocking layer (511) may include a material having a reflectivity of 60% or more or 70% or more. The thickness of the light blocking layer (511) may be less than or equal to the thickness of the diffusion layer (521), and may be 0.1 mm or less, for example, in the range of 0.01 mm to 0.1 mm, and the thickness of the diffusion layer (521) may be 0.1 mm or more, for example, in the range of 0.1 mm to 0.2 mm. If the thickness of the light blocking layer (511) is greater than the above range, the improvement in reflectivity may be minimal and the thickness of the lighting device (1000) may increase, and if it is smaller than the above range, it may be difficult to control the reflectivity and difficult to form the through holes (Ha1, Ha2). If the thickness of the diffusion layer (521) is smaller than the above range, the diffusion effect may be reduced, and if it is larger than the above range, the thickness of the lighting device (1000) may increase.

[0105]

[0106] The above light blocking layer (511) includes a plurality of through holes (Ha1, Ha2), and the plurality of through holes (Ha1, Ha2) may include at least one first through hole (Ha1) that vertically overlaps the areas of the light emitting elements (121, 122) and the upper surface of the substrate (100), and a plurality of second through holes (Ha2) adjacent to the second partition wall (300). On the pixel area (111), the first through holes (Ha1) may be arranged in an inner area, and the second through holes (Ha2) may be arranged in an outer area that is a periphery of the inner area. The inner area may be an area that vertically overlaps a polygonal shape connecting the outermost edges of the light emitting elements (121, 122). The density of the second through holes (Ha2) may be higher than the density of the first through holes (Ha2). The diameter or width of each of the second through holes (Ha2) may be larger than the diameter or width of the first through hole (Ha2). Accordingly, a portion of the light extracted onto the light emitting element (121, 122) may be extracted through the first through hole (Ha1), and most of the light may be extracted through the second through hole (Ha2). Accordingly, the difference in brightness between the inner and outer regions perpendicular to the light emitting element (121, 122) in the pixel area (111) may be reduced.

[0107] The aperture ratio of the pattern having the through holes (Ha1, Ha2) in the light blocking layer (511) is 30% or less, for example, in the range of 20% to 30%, on each pixel area (111). If the aperture ratio is greater than the range, a hot spot may occur, and if it is less than the range, the brightness may decrease. Among the areas of the light blocking layer (511), an area vertically overlapping with the upper surface of the second partition wall (300) may be provided without the through holes (Ha1, Ha2), thereby blocking light leakage between adjacent pixels. In addition, the diffusion layer (521) may include the diffusion material disclosed above therein, and a light blocking member (522) may be arranged in an area vertically overlapping with the upper surface of the second partition wall (300), thereby blocking light leakage between adjacent pixels.

[0108] The pixel area (111) between the second partition walls (300) arranged on the substrate (100) may be provided as an empty area. The empty area may be filled with air. The vertical distance (H1) between the diffusion member (500) on the upper surface of the substrate (100) may be 1 mm or more, for example, in the range of 1 mm to 1.5 mm. If the distance (H1) is smaller than the range, a hot spot may be generated by the light emitted from the light emitting element (121, 122), and if it is larger than the range, the thickness of the lighting device (1000) may increase.

[0109] The distance (D1) between the bottoms of the second partition walls (300) facing each other in the pixel area (111) is a distance in the first direction (X) or the second direction (Y), and may be smaller than the distance (D2) between the tops of the second partition walls (300) facing each other. These distances (D1, D2) may vary depending on the pixel size. The bottom distances (D1) in the first and second directions (X, Y) may be the same as or different from each other. The top distances (D2) in the first and second directions (X, Y) may be the same as or different from each other. That is, the pixel area (111) may be provided in a square shape or a polygonal shape such as a triangle or a rectangle.

[0110] As shown in FIGS. 5 and 6, the minimum distance (D3) between the second partition wall (300) and the first light-emitting element (121) and the minimum distance (D4) between the second partition wall (300) and the second light-emitting element (122) within the pixel area (111) may be equal to or greater than the spacing (D5) between the first and second light-emitting elements (121, 122). The length (L1) of one side of the first light-emitting element (121) or the second light-emitting element (122) may be longer than the spacing (D5) between the first and second light-emitting elements (121, 122). The distance (G1) between the centers of the upper surfaces of the second partition walls (300) facing each other in the first direction (X) may be defined as the size of a unit pixel or the length of the pixel area (111). The unit pixels in the first direction (X) having this distance (G1) may have the same size or different sizes, and the unit pixels in the second direction (Y) may have the same size or different sizes.

[0111] In addition, a light blocking portion (522, see FIG. 7) or a light blocking protrusion (317, FIG. 12c) may be arranged within the diffusion member (500) to block light interference between pixel areas (111). As shown in FIG. 7, the light blocking portion (522) may be provided with a thickness less than or equal to the thickness of the diffusion member (500), for example, 0.5 to 0.9 times the thickness of the diffusion member (500). As shown in FIG. 12c, the light blocking protrusion (317) may be provided with a thickness greater than or equal to 0.5 times the thickness of the diffusion member (500), for example, 0.5 to 1 times the thickness of the diffusion member (500). The light blocking portion (522) or the light blocking protrusion (317) may be provided with a thickness to block light interference between adjacent pixels within the diffusion member (500).

[0112]

[0113] As shown in Fig. 9, the reflective layer (115) may be disposed on the lower surface of the second partition wall (300), and a portion of the reflective layer (115) may be in contact with the lower side of the second partition wall (300). The reflective sheet (115A) may be disposed on the upper surface of the substrate (100) between the reflective layer (115) and the light-emitting elements (121, 122). Accordingly, the reflective sheet (115A) may reflect light traveling toward the bottom of the pixel area (111), and the reflective layer (115) may suppress light leakage between adjacent pixel areas (111).

[0114]

[0115] As shown in Fig. 10, the substrate (100) has an opening (102A) in which a protective layer (102) corresponding to the lower surface (S3) of the second partition wall (300) is opened, and a reflective layer (115) and a first partition wall (200) can be disposed on the wiring layer (101) through the opening (102A) on the substrate (100). A reflective sheet (115A) can be disposed on an area between the first partition wall (200) and the light-emitting elements (121, 122). The first and second light-emitting elements (121, 122) can be mounted on the substrate (100) with first and second pads (PD1, PD2) therebelow. The first and second pads (PD1, PD2) can be electrically connected to a circuit pattern of the wiring layer (101) through a bonding member (108).

[0116] As shown in Fig. 11, the upper height of the first partition wall (200) may be equal to the height (T1) of the groove (311) based on the upper surface of the substrate (100). That is, the upper surface of the first partition wall (200) may be in contact with the inner upper surface of the groove (311). Accordingly, an air gap does not exist in the area between the upper surface of the first partition wall (200) and the inner upper surface of the groove (311) of the second partition wall (300).

[0117]

[0118] A second embodiment will be described with reference to FIGS. 13 to 18. In describing the second embodiment, the same configuration and description as those of the first embodiment will be referred to in the description of the first embodiment.

[0119] Referring to FIGS. 13 to 15, a lighting device (1000) may include a substrate (100), a plurality of light source units (120), a display area (110) having pixel areas (111) in which each of the plurality of light source units (120) is arranged on the substrate (100), a partition wall (200, 300) arranged around each of the pixel areas (111) having the light source units (120) on the substrate (100), and a diffusion member (500) arranged on the pixel area (111). The first partition wall (200) may be arranged along one lower side and the other lower side of the second partition wall (300). That is, the first partition wall (200) may be arranged around each of the pixel areas (111) and may face the light source unit (120). The first partition wall (200) is arranged in an area that vertically overlaps the second partition wall (300) with respect to the upper surface of the substrate (100), and may be arranged at the lower portion of the first side (S1) and the lower portion of the second side (S2) of the second partition wall (300). The second partition walls (300) are arranged around each of the pixel areas (111), and the second partition walls (300) arranged in different pixel areas (111) may be separated from each other.

[0120]

[0121] The second bulkhead (300) includes a first groove (311A) and a second groove (311B) opposite the first groove (311A). The first groove (311A) is formed to be concave from the lower portion of the first side (S1) of the second bulkhead (300) toward the lower portion of the second side (S2), and the second groove (311B) is formed to be concave from the lower portion of the second side (S2) of the second bulkhead (300) toward the lower portion of the first side (S1). The first groove (311A) and the second groove (311B) are formed to be concave from the lower surface of the second bulkhead (300) toward the upper surface. The first bulkhead (200) may be respectively disposed in the first groove (311A) and the second groove (311B). The height (T4) of the first and second grooves (311A, 311B) may be equal to or greater than the upper height or thickness (T5) of the first partition wall (200) based on the upper surface of the substrate (100). Accordingly, the upper surface of the first partition wall (200) may be spaced apart from the inner upper surfaces of the first and second grooves (311A, 311B).

[0122] The top height or thickness (T5) of the first partition wall (200) may be 0.4 mm or less, for example, 80% or more or 120% or less of the thickness (T0) of the light emitting element (121, 122). Accordingly, light emitted from the light emitting element (121, 122) may be effectively blocked. The height (T4) of the first and second grooves (311A, 311B) may be equal to or greater than the lower surface width (W7, W8) of the first partition wall (200). The difference between the height (T4) of the first and second grooves (311A, 311B) and the top height or thickness (T5) of the first partition wall (200) may be 0.2 mm or less. Accordingly, the second partition wall (300) may be coupled on the first partition wall (200).

[0123]

[0124] The support portion (315) of the second partition wall (300) disposed between the first and second grooves (311A, 311B) may have both side surfaces that are in contact with or not in contact with the first partition wall (200). The support portion (315) of the second partition wall (300) is disposed on the reflective layer (115), and the lower surface (S3) of the second partition wall (300) may be adhered to the reflective layer (115). The upper surface of the first partition wall (200) may be a convex curved surface or a flat surface. The reflective layer (115) may be further disposed on the substrate (100) between the first partition wall (200) and the light source unit (120).

[0125] The bottom width (W6) of the second bulkhead (300) is the sum of the bottom width (W9) of the support portion (315) and the bottom widths of the first and second grooves (311A, 311B). The bottom width (W6) of the second bulkhead (300) may be equal to or smaller than the sum of the bottom width (W9) of the support portion (315) of the second bulkhead (300) and the bottom widths (W7, W8) of the first bulkhead (200) arranged in the first and second grooves (311A, 311B). The bottom width (W9) of the support portion (315) of the second bulkhead (300) may be greater than or equal to the bottom width (W7, W8) of the first bulkhead (200) arranged in the first and second grooves (311A, 311B). Accordingly, the lower portion of the second bulkhead (300) can be supported. The bottom width (W7, W8) of the first partition wall (200) arranged in the first and second grooves (311A, 311B) is 0.2 mm or more, for example, in the range of 0.2 mm to 0.4 mm, and may be the same as or different from each other. The bottom width (W9) of the support portion (315) of the second partition wall (300) may be 0.4 to 0.6 times the bottom width (W6) of the second partition wall (300), so as to stably support the second partition wall (300). If the bottom width (W7, W8) of the first partition wall (200) arranged in the first and second grooves (311A, 311B) is smaller than the above range, light may be transmitted and manufacturing may be difficult, and if it is larger than the above range, the improvement in the light leakage phenomenon may be minimal.

[0126]

[0127] As shown in FIG. 16 and FIG. 14, the first partition wall (200) is arranged in the lower grooves (311A, 311B) on both sides of the second partition wall (300), and the upper surface and inner side surface of the first partition wall (200) can be in contact with the surfaces of the first and second grooves (311A, 311B). The height (T4) of the first and second grooves (311A, 311B) can be the same as the upper height or thickness of the first partition wall (200) based on the upper surface of the substrate (100). In addition, the outer side surface of the first partition wall (200) can be arranged on the same vertical line with respect to the lower ends of the first and second side surfaces (S1, S2) of the second partition wall (300) and the upper surface of the substrate (100). Accordingly, the first partition wall (200) can support the lower both sides of the second partition wall (300) and block the incident light. The side cross-section of the first partition wall (200) can have a polygonal, semicircular, or semi-elliptical shape.

[0128] As shown in FIG. 17 and FIG. 14, the first partition wall (200) is arranged in the lower grooves (311A, 311B) on both sides of the second partition wall (300), and a portion of the upper surface and the inner side surface of the first partition wall (200) can be in contact with the surface of the lower groove (311A, 311B). The height (T4) of the first and second grooves (311A, 311B) may be the same as the upper height or thickness of the first partition wall (200) based on the upper surface of the substrate (100). In addition, the outer side surface of the first partition wall (200) is positioned further outward than the first and second side surfaces (S1, S2) of the second partition wall (300), and the upper outer surface may extend outward from the lower ends of the first and second side surfaces (S1, S2) of the second partition wall (300) and be exposed to the outer surface of the second partition wall (300). Accordingly, the first partition wall (200) may support the lower both sides of the second partition wall (300) and block incident light. The side cross section of the first partition wall (200) may have a polygonal, semicircular, or semi-elliptical shape.

[0129] As shown in FIG. 18 and FIG. 14, the substrate (100) has an opening (102A) in which the protective layer (102) corresponding to the lower surface (S3) of the second partition wall (300) is opened, and the first partition wall (200) disposed on both lower sides of the second partition wall (300) and the reflective layer (115) on the substrate (100) can be disposed on the wiring layer (101) through the opening (102A). The light-emitting elements (121, 122) can be mounted on the substrate (100) with first and second pads (PD1, PD2) on the lower side. The first and second pads (PD1, PD2) can be electrically connected to the circuit pattern of the wiring layer (101) through the bonding member (108).

[0130]

[0131] Fig. 19 is an example of a lighting device of the third embodiment. As shown in Fig. 19, first partition walls (201, 202, 203, 204) are arranged on the bottom of the pixel area (111). The first partition walls (201, 202, 203, 204) and the second partition wall (300) are arranged around the light source unit (120) of each of the plurality of pixel areas (111) arranged in the display area. The first partition walls (201, 202, 203, 204) are arranged around the light source unit (120), and the second partition wall (300) is arranged around the first partition walls (201, 202, 203, 204). The upper height of the second partition wall (300) may be higher than the upper position of the first partition wall (201, 202, 203, 204) based on the upper surface of the substrate (100).

[0132] As shown in FIG. 20 and FIG. 14, the upper height of the second partition wall (300) may be higher than the thickness (a) of the first partition wall (201) based on the upper surface of the substrate (100). The thickness (a) of the first partition wall (201) may be smaller than the thickness (T0) of the light-emitting element (121, 122) based on the upper surface of the substrate (100). The minimum distance (d) between the uppermost or highest point of the adjacent light-emitting element (121) and the first partition wall (201) may be greater than the minimum distance (k) between the second partition wall (300) and the light-emitting element (121). Here, when there are a plurality of light-emitting elements in the light source unit (120), the light-emitting element (121) may be an element arranged in an area closest to the first and second partition walls (201, 300).

[0133]

[0134] When the uppermost end of the first partition wall (201) in the area between the second partition wall (300) and the light-emitting element (121) is in contact with an imaginary straight line (L2) passing from the lower end of the second partition wall (300) to the upper end of the light-emitting element (121), since the first partition wall (201) is arranged in the area between the light-emitting element (121) and the second partition wall (300), the first partition wall (201) can block light generated through the side surface of the light-emitting element (121) and traveling toward the lower surface of the second partition wall (300). To this end, the thickness of the light-emitting element (121) based on the upper surface of the substrate (100) may be set to T0, the thickness or top height of the first partition wall (201) may be set to a, the minimum distance between the top of the first partition wall (201) and the light-emitting element (121) adjacent to the first partition wall (201) may be set to d, and the minimum distance between the second partition wall (300) and the light-emitting element (121) may be set to k. The top height of the first partition wall (201) may satisfy the following conditional expression to improve light-shielding efficiency.

[0135] Condition 1: k:TO = (kd): a

[0136]

[0137] As shown in FIG. 21 and FIG. 14, the thickness or top height of the first partition wall (202) can be set to b, the minimum distance between the top of the first partition wall (202) and the light-emitting element (121) adjacent to the first partition wall (202) can be set to e, and the minimum distance between the second partition wall (300) and the light-emitting element (121) can be set to k.

[0138] Condition 2: k:TO = (ke): b

[0139]

[0140] As shown in FIG. 22 and FIG. 14, the thickness or top height of the first partition wall (203) can be set to c, the minimum distance between the top of the first partition wall (203) and the light-emitting element (121) adjacent to the first partition wall (203) can be set to f, and the minimum distance between the second partition wall (300) and the light-emitting element (121) can be set to k.

[0141] Condition 3: k:TO = (kf): c

[0142] In conditions 1, 2, and 3, a < b < c < T0 can be satisfied, and f < e < d < k can be satisfied.

[0143] Condition 4: If f < T0, the conditional expression: 0.7 < a / TO < 0.8 can be satisfied.

[0144] Condition 5: If T0 < e, the conditional expression: 0.4 < b / TO < 0.55 can be satisfied.

[0145] Condition 6: If TO < d, the conditional expression: 0.1 < c / TO < 0.3 can be satisfied.

[0146] Here, in condition 4, 0.5 < f / TO < 1 can be satisfied. In condition 5, 1 < e / TO < 1.5 can be satisfied. In condition 6, 1.7 < d / TO < 2.3 can be satisfied.

[0147]

[0148] As shown in FIG. 23a and FIG. 14, the first partition wall (204) may have a rough surface or an uneven surface on the inner side (S5) facing the light-emitting element (201) and an outer side (S6) facing the first side (S1) of the second partition wall (300). The rough surface or uneven surface may reflect the path of incident light into various paths.

[0149] The second partition wall (300) may be bonded to the upper surface of the substrate (100) by a reflective layer (115) on the lower surface (S3). As another example, as shown in FIG. 23b and FIG. 14, in the embodiment disclosed above, the second partition wall (300) may be disposed on or in contact with the upper surface of the substrate (100) on the lower surface (S3).

[0150] As shown in FIG. 24 and FIG. 14, the substrate (100) has an opening (102A) in which the protective layer (102) corresponding to the lower surface (S3) of the second partition wall (300) is open, and a reflective layer (115) on the substrate (100) can be placed on the wiring layer (101) through the opening (102A).

[0151] As shown in Fig. 25, a first partition wall (201A, 203A) may be double-positioned between the light source unit (120) and the second partition wall (300). The outer first partition wall (201A) may be placed between the inner first partition wall (203A) and the second partition wall (300), and the inner first partition wall (203A) may be placed between the outer first partition wall (201A) and the light source unit (120). The double first partition walls (201A, 203A) may prevent light emitted through the side surfaces of the light-emitting elements (121, 122) of the light source unit (120) from penetrating into adjacent pixel areas.

[0152] As shown in (a) of Fig. 26, the first and second light-emitting elements (121, 122) within each pixel area (111) may be arranged diagonally or in a form in which the corners of the first and second light-emitting elements (121, 122) are arranged adjacent to each other. Alternatively, as shown in (b) of Fig. 26, when there are three light-emitting elements (121A, 121B, 121C) within each pixel area (111), they may be arranged in a triangular shape. The three light-emitting elements (121A, 121B, 121C) may emit light of different colors, for example, red, green, and blue. As shown in (c) of Fig. 26, the light-emitting element (123) may be arranged as a single element within each pixel area (111). The light-emitting element (123) may be arranged at the center of each pixel area (111). The light emitting element (123) can emit any one of blue, green, red, yellow, and white. As another example, adjacent pixel areas (111) can have a pixel area having one light emitting element and a pixel area having two light emitting elements. As another example, adjacent pixel areas (111) can have a pixel area having two light emitting elements and a pixel area having one or three light emitting elements. That is, the lighting device can have at least one pixel area having a different number of light emitting elements. In addition, the pixel area of ​​FIG. 26(a) can be arranged at the center of the lighting device, and the pixel areas of FIG. 26(b) or / and FIG. 26(c) can be arranged at an edge or corner of the lighting device.

[0153]

[0154] Fig. 27 is a plan view of a vehicle to which a lighting device according to an embodiment is applied, Fig. 28 is a drawing showing an example of a taillight and an indicator lamp of the vehicle of Fig. 27, and Fig. 29 is an example of a symbol or letter of an indicator lamp being displayed by the lighting device of Fig. 28.

[0155] Referring to FIGS. 27 and 28, a front lamp (2) in a moving body or vehicle (1) may include one or more lighting modules, and by individually controlling the driving timing of these lighting modules, it may provide not only a function as a conventional headlight, but also additional functions such as a welcome light or a celebration effect when a driver opens a vehicle door. The lamp may be applied to a daytime running light, a high beam, a low beam, a fog light, or a turn signal. A rear lamp (2) in a vehicle (1) may have a plurality of lamp units, and the lamp units may be provided as a tail light, a brake light, a reverse light, a turn signal lamp, etc.

[0156] The lighting device (1000) may be arranged on one side or the other side, above or below the taillight (2) of the vehicle (1), or installed in a part of the rear of the vehicle. The lighting device (1000) may be installed on the side of the vehicle or inside the vehicle. This lighting device (1000) displays an image or information such as a sign, logo, symbol, or character by a plurality of pixel areas (111), and is provided as a lighting module or an indicator lamp. That is, as shown in (a) and (b) of FIG. 29, it may be displayed as a symbol such as an exclamation mark (!), or as a character such as STOP that can be recognized by other drivers. This lighting device (1000) has a double-barrier structure in which the pixel areas (111) have a double-barrier structure, and the double-barrier structure can prevent light interference or light leakage between adjacent pixel areas (111). Accordingly, it is possible to prevent a decrease in the brightness of the pixels and provide a lighting device having a clearer contrast ratio. In addition, by providing the lighting device (1000) with a thickness of less than 4 mm or less than 3 mm in a rigid or flexible manner, the lighting device (1000) can be tightly coupled to the surface of the vehicle's housing or bracket. The lighting device (1000) can be applied to a headlight or a taillight to function as a headlight or a taillight, or to display an image or information in the headlight or taillight.

[0157]

[0158] The features, structures, effects, etc. described in the embodiments above are included in at least one embodiment of the present invention, and are not necessarily limited to just one embodiment. Furthermore, the features, structures, effects, etc. illustrated in each embodiment can be combined or modified and implemented in other embodiments by a person having ordinary skill in the art to which the embodiments pertain. Therefore, the contents related to such combinations and modifications should be interpreted as being included in the scope of the present invention. In addition, although the embodiments have been described above, these are merely examples and do not limit the present invention. Those having ordinary skill in the art to which the present invention pertains will appreciate that various modifications and applications not illustrated above are possible without departing from the essential characteristics of the embodiments. For example, each component specifically shown in the embodiments can be modified and implemented. In addition, the differences related to such modifications and applications should be interpreted as being included in the scope of the present invention defined in the appended claims.

Claims

1. Substrate; A plurality of light sources arranged in different first and second directions on the substrate; and A first bulkhead arranged around each of the plurality of light source units; A second bulkhead disposed on the first bulkhead, each having a hole in which the plurality of light sources are arranged; and It includes the above plurality of light sources and a diffusion member arranged on the second bulkhead, Each of the above plurality of light source units has at least one light emitting element, The thickness of the above first bulkhead is greater than or equal to the thickness of the light source unit based on the upper surface of the substrate, A lighting device in which the thickness of the second partition wall is thicker than the thickness of the light source unit and the thickness of the first partition wall.

2. In paragraph 1, having a concave groove on the floor between the opposite sides of the second bulkhead, A lighting device wherein the first bulkhead is arranged along the groove of the second bulkhead.

3. In paragraph 2, The above second bulkhead has a grid shape, The area where each of the above plurality of light sources is placed is a pixel area, The above lighting device is a lighting device that is coupled to a vehicle and displays an image or information having a sign, character, or symbol through the plurality of pixel areas.

4. In paragraph 2, A lighting device in which the first bulkhead is in contact with the surface of the groove of the second bulkhead.

5. In paragraph 1, The second bulkhead has first and second sides opposite to each other, a first groove concave in the lower part of the first side, and a second groove concave in the lower part of the second side, The above first groove and the above second groove are arranged around the periphery of adjacent light source parts, A lighting device wherein the first bulkhead is respectively disposed in the first groove and the second groove of the second bulkhead.

6. In paragraph 5, The second bulkhead includes a support member disposed between the first and second grooves, A lighting device in which the bottom width of the support portion is larger than the bottom width of the first bulkhead disposed in each of the first and second grooves.

7. In paragraph 5, A lighting device in which a portion of the second bulkhead protrudes further outward than the first and second sides of the second bulkhead.

8. In any one of paragraphs 1 to 7, An adhesive member disposed between the second bulkhead and the diffusion member; and A lighting device comprising a reflective layer bonded between the second bulkhead and the substrate.

9. In paragraph 8, A lighting device wherein the reflective layer extends further into an area between the second barrier and the light source on the substrate.

10. In any one of paragraphs 1 to 7, A lighting device, wherein a portion of the first partition wall and the second partition wall are in contact with the surface of the substrate.

11. Substrate; A plurality of light sources arranged in different first and second directions on the substrate; and A plurality of first bulkheads arranged around each of the plurality of light source units; A second bulkhead having a hole in which each of the plurality of light sources is arranged and arranged around each of the plurality of first bulkheads; and It includes the above plurality of light sources and a diffusion member arranged on the second bulkhead, Each of the above plurality of light source units has at least one light emitting element, The thickness of the first bulkhead is less than the thickness of the light source unit based on the upper surface of the substrate, A lighting device in which the thickness of the second bulkhead is thicker than the thickness of the light source unit.

12. In paragraph 11, The thickness of the above light emitting element is T0, The thickness of the above first bulkhead is a, The minimum distance between the top of the first bulkhead and the light emitting element adjacent to the first bulkhead is d, The minimum distance between the second bulkhead and the light emitting element is k, Condition 1: k:TO = (kd): a A lighting device that satisfies .

13. In paragraph 12, In the above condition 1, if condition: d < T0, then condition 2: 0.7 < a / TO < 0.8 is satisfied, In the above conditions 1 and 2, d and T0 are lighting devices that satisfy 0.5 < d / TO < 1.

14. In paragraph 12, In the above condition 1, if condition: T0 < d, then condition 3: 0.4 < b / TO < 0.55 is satisfied, In the above conditions 1 and 3, d and T0 are lighting devices that satisfy 1 < d / TO < 1.

5.

15. In paragraph 12, In the above condition 1, if condition: TO < d, then condition 4: 0.1 < c / TO < 0.3 is satisfied, In the above conditions 1 and 4, d and T0 are lighting devices that satisfy 1.7 < d / TO < 2.3.

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