Patent Description:
Typical lighting applications include vehicle lights as well as backlights for displays and signs. Light emitting devices, for example, light emitting diodes (LEDs) have advantages such as low power consumption, semi-permanent life, fast response speed, safety, and environmental friendliness compared to conventional light sources such as fluorescent lamps and incandescent lamps. These light emitting diodes are applied to various display devices, various lighting devices such as indoor or outdoor lights. Recently, as a vehicle light source, a lamp employing a light emitting diode has been proposed. Compared with incandescent lamps, light emitting diodes are advantageous in that power consumption is small. However, since the emission angle of light emitted from the light emitting diode is small, when the light emitting diode is used as a vehicle lamp, there is a demand for increasing the light emitting area of the lamp using the light emitting diode. Light emitting diodes can increase the design freedom of lamps because of their small size, and are economical due to their semi-permanent lifetime.

<CIT> discloses an optical cavity including a light emitting device and wavelength converting material. <CIT> discloses a light emitting diode array packaging structure with microstructure silica-gel lens. <CIT> discloses a light converting optical structure and lighting device utilizing the same.

An embodiment of the invention provides a lighting module that provides a surface light source. Embodiments of the invention provide a lighting module in which a plurality of light emitting devices and a recess portion for reflecting or diffusing light are disposed on each of the light emitting devices. An embodiment of the invention provides a lighting module having a recess portion recessed in the direction of the resin layer between a resin layer covering a light emitting device and a phosphor layer. An embodiment of the invention provides a flexible lighting module having a plurality of light emitting devices, a resin layer, and a phosphor layer on a substrate. An embodiment of the invention provides a lighting module with improved light extraction efficiency and light distribution characteristics. An embodiment of the invention provides a lighting module for irradiating a surface light source and a lighting device having the same. An embodiment of the invention may provide a light unit having a lighting module, a liquid crystal display device, or a vehicle lamp.

In the present description and drawings, any examples and technical descriptions of apparatuses, products and/or methods which are not covered by the claims should be taken as background art or examples useful for understanding the invention.

A lighting module according to the invention includes a substrate; a plurality of light emitting devices disposed on the substrate; a resin layer disposed on the substrate and the light emitting devices; a phosphor layer disposed on the resin layer; and a recess portion overlapping the light emitting device in a vertical direction, wherein an area of an upper surface of the recess portion includes a range of <NUM>% to <NUM>% of an area of an upper surface of the light emitting device, and the recess portion is formed to be concave in the direction of the light emitting device on the upper surface of the resin layer and includes an inclined side surface lower than the upper surface of the resin layer.

According to the invention, a shortest distance between the recess portion and the light emitting device includes a range of <NUM> to <NUM> times a thickness of the light emitting device. An angle formed by a side surface of the recess portion and a horizontal upper surface of the resin layer may range from <NUM> degrees to <NUM> degrees. The recess portion may have an inverted cone or an inverted polygonal pyramid shape. The recess portion may be filled with air or may include a material having a refractive index of <NUM>. The recess portion includes a vertex that is a lowermost point of the inclined side surface, and an inner angle formed by one side and the other side of the recess portion may range from <NUM> degrees to <NUM> degrees based on the vertex. The phosphor layer may include a red phosphor, and at least one of the resin layer and the phosphor layer may include a diffusion agent. An edge of an upper surface of the recess portion and an edge of an upper surface of the light emitting device may extend in the same direction. In accordance with the claimed invention, the lighting module includes a light shielding portion or a phosphor portion disposed on an upper surface of each of the light emitting devices. A reflective member may be disposed between the substrate and the resin layer and may be disposed around the light emitting device, and a height of the reflective member may decrease from a center region toward an edge thereof. A lighting device according to an embodiment of the invention may include one or a plurality of the lighting modules.

According to an embodiment of the invention, in the lighting module, the light uniformity of the surface light source may be improved. In the lighting module, a conical recess portion is provided on each light emitting device in an empty space, so that incident light may be reflected or diffused. In the lighting module, hot spots on each light emitting device may be reduced. In addition, by stacking layers of resin material on the light emitting device, a flexible lighting module may be implemented. The light efficiency and light distribution characteristics of the lighting module may be improved. The optical reliability of the lighting module and the lighting device having the same may be improved. The reliability of the vehicle lighting device having the lighting module may be improved. Embodiments of the invention may be applied to a backlight unit having a lighting module, various display devices, surface light source lighting devices, or vehicle lamps.

Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings, in which a person having ordinary skill in the art to which the invention pertains may easily implement the invention. However, it should be understood that embodiments described in the specification and configurations illustrated in the drawings are merely a preferred embodiment of the invention, and there are various equivalents and modifications that may substitute the embodiments and configurations at the time of filing the present application.

In describing operating principles of a preferred embodiment of the invention in detail, when detailed description of a known function or configuration is deemed to unnecessarily blur the gist of the present disclosure, the detailed description will be omitted. Terms to be described below are defined as terms defined in consideration of functions of the invention and meaning of each term should be interpreted based on the contents throughout the specification. The same reference numerals are used for parts having similar functions and actions throughout the drawings.

A lighting device according to the invention may be applied to various lamp devices requiring lighting, for example, a vehicle lamp, a home lighting device, or an industrial lighting device. For example, when a lighting device is applied to a vehicle lamp, it may be applied to a head lamp, a side mirror lamp, a fog lamp, a tail lamp, a stop lamp, a side marker lamp, a daytime running light, a vehicle interior lighting, a door scarf, rear combination lamps, a backup lamp, and the like. The lighting device of the invention may also be applied to indoor and outdoor advertisement apparatus fields, and also may be applicable to all other lighting-related fields and advertisement-related fields that are currently being developed and commercialized or that may be implemented by technological development in the future.

Hereinafter, embodiments will be shown more apparent through the description of the appended drawings and embodiments. In the description of the embodiments, in the case in which each layer (film), area, pad or pattern is described as being formed "on" or "under" each layer (film), area, pad or pattern, the "on" and "under" include both of forming "directly" and "indirectly". Also, the reference for determining "on" or "under" each layer will be described based on the figures.

<FIG> is a plan view showing a lighting module including some but not all features of the claimed invention, <FIG> is an example of a cross-sectional view of a A-A side of the lighting module of <FIG>, <FIG> is a partially enlarged view of the lighting module of <FIG>, and <FIG> is a perspective view illustrating an arrangement example of the light emitting device and the recess portion, and <FIG> is a diagram illustrating an arrangement example of the light emitting device and the recess portion in <FIG>.

<FIG>, the lighting module <NUM> may include a substrate <NUM>, a light emitting device <NUM> disposed on the substrate <NUM>, and a resin layer <NUM> covers the light emitting device <NUM> on the substrate <NUM>. It includes a recess portion <NUM> overlapping the light emitting device <NUM> in a vertical direction. The lighting module <NUM> includes a phosphor layer <NUM> on the resin layer <NUM>. The lighting module <NUM> may emit light emitted from the light emitting device <NUM> to a surface light source. The lighting module <NUM> may be a rigid module or a flexible module.

As shown in <FIG>, in the lighting module <NUM>, a plurality of light emitting devices <NUM> may be arranged as N in a first direction X (N is an integer of <NUM> or more) and M in a second direction (M is an integer of <NUM> or more). The plurality of light emitting devices <NUM> may be arranged in a line shape or a matrix shape having N x M. The lighting module <NUM> may be applied to various lamp devices that require lighting, such as vehicle lamps, home lighting devices, and industrial lighting devices. For example, in the case of lighting modules applied to vehicle lamps, head lamps, vehicle position lamps, side mirror lamps, fog lamps, tail lamps, turn signal lamps, back up lamps, and stop lamps, daytime running right, vehicle interior lighting, door scarf, rear combination lamp, and backup lamp, etc. The lighting module <NUM> may be provided as a flexible module in the form of being assembled to a bracket having an inclined or curved surface or a housing. The lighting module <NUM> may emit at least one of green, blue, yellow, white, or red light. For example, the lighting module <NUM> may emit at least one of red light and yellow light.

The substrate <NUM> includes a printed circuit board (PCB), for example, a resin-based printed circuit board (PCB), a metal core PCB, a flexible PCB, and a ceramic PCB, and FR-<NUM> substrate. The substrate <NUM> may include, for example, a flexible PCB. The upper surface of the substrate <NUM> has an X axis - Y axis plane, and the thickness of the substrate <NUM> may be a height in the Z direction orthogonal to the X and Y directions. Here, the X direction may be a first direction, the Y direction may be a second direction orthogonal to the X direction, and the Z direction may be a third direction orthogonal to the X direction and the Y direction. The length of the substrate <NUM> in the X direction and the length in the Y direction may be the same or different from each other. The thickness of the substrate <NUM> may be <NUM> or less, for example, in the range of <NUM> to <NUM>. Since the thickness of the substrate <NUM> is provided to be thin, the thickness of the lighting module may not be increased. The thickness t1 of the lighting module <NUM> may be <NUM> or less from the bottom of the substrate <NUM>, for example, <NUM> to <NUM> or <NUM> to <NUM>. The thickness t1 of the lighting module <NUM> may be a linear distance between the lower surface of the substrate <NUM> and the upper surface of the phosphor layer <NUM>. The thickness t1 of the lighting module <NUM> may be <NUM>% or less of the thickness t2 of the resin layer <NUM>, for example, in the range of <NUM>% to <NUM>%.

The substrate <NUM> may include a wiring layer (not shown) thereon, and the wiring layer may be electrically connected to the light emitting device <NUM>. The plurality of light emitting devices <NUM> may be connected in series, parallel, or in series-parallel by a wiring layer of the substrate <NUM>. The substrate <NUM> may function as a base member or a support member positioned under the light emitting device <NUM> and the resin layer <NUM>. When the thickness t1 of the lighting module <NUM> is thinner than the above range, the light diffusion space may be reduced and a hot spot may occur, and when it is greater than the thickness range, spatial installation restrictions and design freedom may be reduced due to the module thickness. An embodiment of the invention may have a thin thickness t1 of the lighting module <NUM>, for example, <NUM> or less or <NUM> or less, and provide a uniform luminance distribution.

The substrate <NUM> may be provided with a connector in a portion to supply power to the light emitting devices <NUM>. A region on the substrate <NUM> in which the connector is disposed may be a region in which a resin layer is not formed. A top view shape of the substrate <NUM> may have a rectangular shape, a square shape, or another polygonal shape. The substrate <NUM> may be a bar shape having a long linear shape or a curved shape in one direction. The substrate <NUM> may include a protective layer or a reflective layer thereon. The protective layer or the reflective layer may include a member having a solder resist material, and the solder resist material is a white material, and may reflect incident light.

The light emitting device <NUM> is disposed on the substrate <NUM> and may be sealed with the resin layer <NUM>. The light emitting device <NUM> emits light through the resin layer <NUM>. The resin layer <NUM> may be in contact with the surface of the light emitting device <NUM>. As shown in <FIG>, each of the light emitting devices <NUM> has a plurality of side surfaces s1 and an upper surface s2, and the upper surface s2 may face the upper surface of the resin layer <NUM>. The light emitting device <NUM> may emit light through the plurality of side surfaces s1. The plurality of side surfaces s1 and the upper surface s2 of the light emitting device <NUM> are emitted light through the resin layer <NUM>. When the phosphor layer <NUM> is disposed on the resin layer <NUM>, light traveling through the resin layer <NUM> may be wavelength-converted through the phosphor layer <NUM> and then emitted. The light emitting device <NUM> is an LED chip that emits light on at least five surfaces, and may be disposed on the substrate <NUM> in a flip chip form. As another example, the light emitting device <NUM> may include a horizontal type LED chip or a vertical type LED chip. When the light emitting device <NUM> is a horizontal chip or a vertical chip, the chip is connected to another chip or a wiring pattern with a wire, and the thickness of the resin layer may increase due to the height of the wire. In addition, since a connection space according to the length of the wire is required, the interval between the light emitting devices <NUM> may be increased. As another example, the light emitting device <NUM> may be provided as a package having an LED chip.

The light emitting device <NUM> may be formed to have a thickness t0 (<FIG>) of <NUM> or less. In the light emitting device <NUM> according to the embodiment of the invention, a distribution of the orientation angle may be increased due to the five-sided light emission. The pitch a1 between the light emitting devices <NUM> is equal to or greater than the thickness t2 (t2 = a1) of the resin layer <NUM>, for example, <NUM> or more, and may vary according to the LED chip size. It may be seen that the light emitting device <NUM> disclosed in the embodiment of the invention is provided as an LED chip that emits light on at least five surfaces, thereby further improving luminance distribution and a distribution of the orientation angle. When the light emitting devices <NUM> are arranged in an N x M matrix on the substrate <NUM>, the N may be <NUM> or <NUM> or more, and the M may be <NUM> or more. The light emitting devices <NUM> may be arranged in a first direction X and a second direction Y, respectively.

The light emitting device <NUM> is a light emitting diode (LED) chip and may emit at least one of blue, red, green, ultraviolet (UV) and infrared rays. The light emitting device <NUM> may emit at least one of, for example, blue, red, and green light. The light emitting device <NUM> may be electrically connected to the substrate <NUM>. The light emitting device <NUM> may emit blue light, for example, in a range of <NUM> to <NUM>. The plurality of light emitting devices <NUM> may emit light of the same wavelength or different wavelengths. The different wavelengths may emit light in a range of <NUM> to <NUM> and a range of <NUM> to <NUM>, for example. The light emitting device <NUM> may be sealed with a transparent insulating layer or a layer of a resin material on the surface. The light emitting device <NUM> may have a phosphor layer having a phosphor on a surface thereof. The light emitting device <NUM> may have a support member having a ceramic support member or a metal plate disposed under it, and the support member may be used as an electric conduction and heat conduction member.

The resin layer <NUM> is disposed on the substrate <NUM>. The resin layer <NUM> seals the light emitting device <NUM> on the substrate <NUM>. The resin layer <NUM> may be adhered to the upper surface of the substrate <NUM>. The resin layer <NUM> may be adhered to the upper surface of the substrate <NUM> with an adhesive or may be directly adhered. For example, the resin layer <NUM> may be formed on the substrate <NUM> by a transfer molding method.

A plurality of layers is stacked on the light emitting device <NUM> according to an embodiment of the invention, and the plurality of layers may include, for example, two or more layers or three or more layers. The plurality of layers may optionally include at least two or three or more layers of a layer having no impurities, a layer to which a phosphor is added, a layer having a diffusion agent, and a layer to which a phosphor/diffuser is added. At least one of the plurality of layers may selectively include a diffusion agent and a phosphor. That is, the phosphor and the diffusion agent may be disposed in separate layers from each other, or may be mixed with each other and disposed in one layer. The impurity may be a phosphor and a diffusion agent. The layers provided with the phosphor and the diffusion agent may be disposed adjacent to each other or may be disposed spaced apart from each other. When the layer with the phosphor and the layer with the diffusion agent are separated from each other, the layer on which the phosphor is disposed may be disposed above the layer on which the diffusion agent is disposed. The phosphor may include at least one of a blue phosphor, a green phosphor, a red phosphor, and a yellow phosphor. The size of the phosphor may range from <NUM> to <NUM>. The higher the density of the phosphor, the higher the wavelength conversion efficiency may be, but since the luminous intensity may be lowered, it may be added in consideration of the light efficiency within the above size. The diffusion agent may include at least one of PMMA (Poly Methyl Meth Acrylate) series, TiO<NUM>, SiO<NUM>, Al<NUM>O<NUM>, and silicon series. The diffusion agent may have a refractive index in the range of <NUM> to <NUM> at the emission wavelength, and its size may be in the range of <NUM> to <NUM>. The diffusion agent may have a spherical shape, but is not limited thereto. The plurality of layers may include a resin material. The plurality of layers may have the same refractive index, at least two layers have the same refractive index, or a layer adjacent to the uppermost layer may gradually decrease the refractive index.

As shown in <FIG> and <FIG>, the resin layer <NUM> may have a thickness t2 that is thicker than the thickness t0 of the light emitting device <NUM>. The thickness t2 of the resin layer <NUM> may be thicker than the thickness of the substrate <NUM>, and may be <NUM> times or more than the thickness of the substrate <NUM>, for example, in a range of <NUM> to <NUM> times. Since the resin layer <NUM> is disposed at the thickness t2, it is possible to seal the light emitting device <NUM> on the substrate <NUM>, prevent moisture penetration, and support the substrate <NUM>. The resin layer <NUM> and the substrate <NUM> may be formed of a flexible plate. The thickness t2 of the resin layer <NUM> may be less than <NUM>, for example, in the range of <NUM> to <NUM> or in the range of <NUM> to <NUM>. The thickness t2 of the resin layer <NUM> may be thicker than the thickness t3 of the phosphor layer <NUM> and may be thicker than the thickness of the substrate <NUM>. The thickness t2 of the resin layer <NUM> may be less than <NUM>, for example, <NUM> or less, and may be thicker than the sum of the thickness t3 of the phosphor layer <NUM> and the thickness of the substrate <NUM>.

The resin layer <NUM> may be a transparent resin material, for example, a resin material such as UV (Ultra violet) resin, silicone, or epoxy. The resin layer <NUM> may be a transparent resin material, for example, a resin material such as UV (Ultra violet) resin, epoxy, or silicone. The refractive index of the resin layer <NUM> may be <NUM> or less, for example, <NUM> to <NUM> or <NUM> to <NUM>, and may be lower than the refractive index of the diffusion agent. The UV resin may be, for example, a resin (oligomer type) containing a urethane acrylate oligomer as a main material. For example, it is possible to use a synthetic oligomer urethane acrylate oligomer. The main material may further include a monomer in which isobornyl acrylate (IBOA), hydroxybutyl acrylate (HBA), and hydroxy metaethyl acrylate (HEMA), which are low boiling point diluent type reactive monomers, are mixed, and as an additive, a photoinitiator (for example, <NUM>-hydroxycyclohexyl phenyl-ketone, Diphenyl), Diphenyl (<NUM>,<NUM>,<NUM>-trimethylbenzoyl phosphine oxide), an antioxidant or the like may be mixed. The UV resin may be formed of a composition including <NUM> to <NUM>% of an oligomer, <NUM> to <NUM>% of a monomer, and <NUM> to <NUM>% of an additive. In this case, the monomer may be a mixture of <NUM> to <NUM>% of isobornyl acrylate (IBOA), <NUM> to <NUM>% of hydroxybutyl acrylate (HBA), and <NUM> to <NUM>% of hydroxy metaethyl acrylate (HEMA). The additive may be added in an amount of <NUM> to <NUM>% of a photo initiator to be able to perform a function of initiating photo reactivity, and may be formed of a mixture capable of improving yellowing by adding <NUM> to <NUM>% of an antioxidant. The formation of the resin layer using the above-described composition may form a layer with a resin such as UV resin instead of a light guide plate to adjust the refractive index and the thickness, and simultaneously, may satisfy all of adhesive characteristics, reliability and a mass production rate by using the above-described composition.

The phosphor layer <NUM> is disposed on the resin layer <NUM>. The phosphor layer <NUM> may be disposed on the upper surface of the resin layer <NUM>. A side portion 51a of the phosphor layer <NUM> may be disposed on an outer side of the resin layer <NUM>. The side portions 51a of the phosphor layer <NUM> may be disposed on all sides of the resin layer <NUM>. The side portion 51a of the phosphor layer <NUM> may be adhered to the upper surface of the substrate <NUM>. The side portion 51a of the phosphor layer <NUM> extends to the outer side of the resin layer <NUM> and contacts the upper surface of the substrate <NUM>, so that moisture penetration may be prevented. The side portion 51a of the phosphor layer <NUM> may emit wavelength-converted light. The phosphor layer <NUM> may include the same phosphor or different phosphors in an upper region disposed on an upper surface of the resin layer <NUM> and a region of the side portion 51a. For example, a first phosphor may be added to the upper region, and a second phosphor may be added to the side portion 51a. The first phosphor is a red phosphor, and the second phosphor may include at least one of red, green, yellow, and blue. The phosphor layer <NUM> may be a material different from or the same material as the resin material of the resin layer <NUM>. The phosphor layer <NUM> may include a transparent resin material, and may include a phosphor therein. The phosphor layer <NUM> may include one or more types of phosphors, for example, at least one of a red phosphor, a green phosphor, a blue phosphor, and a yellow phosphor. The phosphor layer <NUM> may include a red phosphor, or a red phosphor and red ink. The phosphor layer <NUM> may convert a wavelength of incident light by including a phosphor therein. Here, when the light emitted from the light emitting device <NUM> is the first light and the light converted from the phosphor layer <NUM> is the second light, the second light may have a longer wavelength than the first light. The second light on the lighting module <NUM> may be higher than the luminous intensity of the first light. This is because the phosphor layer <NUM> converts most of the light into wavelength, so that the luminous intensity of the second light converted through the phosphor layer <NUM> may be higher than the luminous intensity of the first light. When turned on or off of the light, the surface color of the phosphor layer <NUM> may be a red color or a color close to red. When turned on or off of the light, the surface color of the phosphor layer <NUM> may be a color close to that of the phosphor. When turned off of the light, the surface color of the phosphor layer <NUM> may be the same as the color of the ink added in the phosphor layer <NUM>.

The phosphor layer <NUM> may include a material such as silicon or epoxy. The phosphor layer <NUM> may have a refractive index in the range of <NUM> to <NUM>. The phosphor layer <NUM> may have a refractive index equal to or higher than that of a diffusion agent. The phosphor layer <NUM> may be higher than the refractive index of the resin layer <NUM>. When the refractive index of the phosphor layer <NUM> is lower than the above range, the uniformity of light may be lowered, and when it is higher than the above range, the light transmittance may decrease. Accordingly, the refractive index of the phosphor layer <NUM> is provided in the above range, so that the light transmittance and the light uniformity may be adjusted. Since the phosphor layer <NUM> has a phosphor therein, it may be defined as a layer that diffuses light. The content of the phosphor may be added in the same amount or ratio as the resin material forming the phosphor layer <NUM>. In the phosphor layer <NUM>, a ratio of a resin material and a phosphor may be mixed in a ratio of, for example, <NUM>:<NUM> to <NUM>:<NUM>. The phosphor may range from <NUM> wt% to <NUM> wt% in the phosphor layer <NUM>. The content of the phosphor may have a difference of <NUM>% or less or <NUM>% or less with respect to the resin material of the phosphor layer <NUM>. In an embodiment of the invention, by adding the phosphor content to the phosphor layer <NUM> at a ratio of <NUM>% or more and <NUM>% or less, the color on the surface of the phosphor layer <NUM> may be provided as the color of the phosphor and the light diffusion and wavelength conversion efficiency may be improved. In addition, transmission of the wavelength of light emitted from the light emitting device <NUM> through the phosphor layer <NUM>, for example, the transmission of blue light may be reduced. In addition, the light extracted through the phosphor layer <NUM> may be provided as a surface light source according to the wavelength of the phosphor.

The phosphor layer <NUM> may be provided in the form of a film by, for example, adding a phosphor in a silicone material and then curing it. The phosphor layer <NUM> may be formed directly on the resin layer <NUM> or may be separately formed and then adhered. The phosphor layer <NUM> manufactured in the form of a film may be adhered to the upper surface of the resin layer <NUM>. An adhesive may be disposed between the phosphor layer <NUM> and the resin layer <NUM>. The adhesive is a transparent material, and may be an adhesive such as UV adhesive, silicone or epoxy. Since the phosphor layer <NUM> is provided in the form of a film, it is possible to provide a uniform distribution of the phosphor inside, and the color sense of the surface color may be provided at a certain level or higher.

By using a film made of a resin material for the phosphor layer <NUM>, a module having high ductility may be provided compared to the case of using a polyester (PET) film. The phosphor layer <NUM> may be a protective film having a phosphor or a release film having a phosphor. The phosphor layer <NUM> may be provided as a film attachable or detachable from the resin layer <NUM>.

The phosphor layer <NUM> may have a thickness t3 (t3 <t2) smaller than the thickness (t2) of the resin layer <NUM>. The phosphor layer <NUM> may have a thickness of <NUM> or less, for example, in the range of <NUM> to <NUM>. The thickness t3 of the phosphor layer <NUM> may be <NUM>% or less of the thickness t2 of the resin layer <NUM>. The thickness t3 of the phosphor layer <NUM> may be <NUM>% or less of the thickness t2 of the resin layer <NUM>, for example, in a range of <NUM>% to <NUM>%. When the thickness t3 of the phosphor layer <NUM> is thicker than the above range, the light extraction efficiency by the phosphor layer <NUM> may decrease or the module thickness may increase. When it is smaller than the above range, it may be difficult to suppress the hot spots or the wavelength conversion efficiency may be lowered. In addition, the phosphor layer <NUM> is a layer for wavelength conversion and external protection, and when it is thicker than the above range, the ductility characteristics of the module may be deteriorated, and design freedom may be lowered. The phosphor converts the light emitted from the light emitting device <NUM> to wavelength. When the phosphor is a red phosphor, it is converted into red light. The resin layer <NUM> uniformly reflects or diffuses light by the recess portion <NUM> so that most of the light emitted from the light emitting device <NUM> may be converted to wavelength, and the light diffused through the resin layer <NUM> may be wavelength converted by the phosphor.

Since the phosphor layer <NUM> includes a phosphor, an external color may be seen as the color of the phosphor. For example, when the phosphor is red, the surface color may be seen as red, so when the light emitting device <NUM> is turned off, a red image may be provided, and when the light emitting device <NUM> is turned off, a predetermined red light having a luminous intensity may be diffused and may be provide a red image of a surface light source. As another example, a layer having the same color as the phosphor or a deeper color sense may be further disposed on the surface of the phosphor layer <NUM>. That is, when a red phosphor is added, a red ink layer may be formed on the surface. The lighting module <NUM> according to the embodiment may have a thickness of <NUM> or less, emit a surface light source through a surface, and may have flexible characteristics. The lighting module <NUM> may emit light through an upper surface and a side surface, and when the lighting module is combined with a housing, the side light may be guided upward or reflected again.

As shown in <FIG> and <FIG>, the lighting module <NUM> may include a recess portion <NUM>. The recess portion <NUM> may be disposed on the resin layer <NUM>. The resin layer <NUM> according to an embodiment of the invention may include a recess portion <NUM> thereon. The recess portions <NUM> overlap each of the light emitting devices <NUM> in a vertical direction. The recess portion <NUM> and the light emitting device <NUM> may correspond to one-to-one (<NUM>:<NUM>). The recess portion <NUM> may diffuse light emitted through the upper surface of the light emitting device <NUM> on the light emitting device <NUM> in a lateral direction. The recess portion <NUM> may be disposed on the resin layer <NUM> to reflect or diffuse incident light. Accordingly, the resin layer <NUM> having the recess portion <NUM> may prevent hot spots in a region overlapping the light emitting device <NUM> in a vertical direction. Accordingly, the lighting module <NUM> may provide a uniform luminance distribution without adding a diffusion agent inside the resin layer <NUM>.

When the above-described recess portion <NUM> is not in the resin layer <NUM>, the following problems occur. In order to suppress hot spots on the resin layer, a diffusion agent is added to the inside of the resin layer, and thus, the light intensity due to the diffusion agent may be reduced. In order to prevent hot spots on the resin layer, the thickness of the resin layer having a diffusion agent is formed to be thicker, for example, <NUM> or more, so that the module thickness is increased. Alternatively, when a layer having a diffusion agent is further added on the resin layer, it may cause an increase in the manufacturing process or module thickness. There is a limit to widening the interval between light emitting devices in the resin layer. The embodiment of the invention reduces the amount of the diffusion agent and adds to the diffusion agent to at least one of the phosphor layer <NUM> and the resin layer <NUM>, thereby improving the surface light source more.

In an embodiment of the invention, the recess portion <NUM> of the resin layer <NUM> suppresses hot spots or dark portions by allowing the light emitting devices <NUM> to overlap in a vertical direction and spaced apart from the light emitting devices <NUM> at predetermined intervals. The resin layer <NUM> may have a thickness of less than <NUM>, for example, less than <NUM>. Therefore, the lighting module <NUM> may be provided as a lighting lamp such as an OLED or a lighting lamp of the same size as a micro LED. In addition, light may be diffused in the lateral direction by the recess portion <NUM>, thereby increasing the interval between the light emitting devices <NUM>.

As shown in <FIG> and <FIG>, the recess portions <NUM> are respectively disposed on the light emitting device <NUM> and may be disposed between the resin layer <NUM> and the phosphor layer <NUM>. The recess portion <NUM> may be recessed from the upper surface of the resin layer <NUM> toward the light emitting device <NUM>. The recess portion <NUM> may include an air space, and the air space may be provided in an air or vacuum state. The refractive index of the space provided by the recess portion <NUM> may be <NUM> or less or <NUM>. The recess portion <NUM> is made of air, and may include at least one of oxygen, nitrogen, or argon gas.

The upper surface of the recess portion <NUM> may face the lower surface of the phosphor layer <NUM>. The side surface r1 of the recess portion <NUM> may be a boundary surface with the resin layer <NUM> or a circumferential surface or a side surface of the recess region. The side surface r1 of the recess portion <NUM> may be formed by the resin layer <NUM>. The side surface r1 of the recess portion <NUM> may be disposed lower than an upper surface of the resin layer <NUM>. The side surface r1 of the recess portion <NUM> may be provided as a reflective surface. The side surface r1 of the recess portion <NUM> may be provided as a surface inclined with respect to a horizontal straight line. The side surface r1 of the recess portion <NUM> may be provided as a surface inclined with respect to a horizontal lower surface of the phosphor layer <NUM>. The angle c1 formed between the side surface r1 of the recess portion <NUM> and the upper surface of the resin layer may be <NUM> degrees or less, and may be in the range of <NUM> degrees to <NUM> degrees. The recess portion <NUM> may include a vertex r2 that is the lowest point of the inclined side surface r1. An inner angle formed by one side and the other side of the recess portion <NUM> based on the vertex r2 may range from <NUM> degrees to <NUM> degrees. When the angle c1 and the inner angle are smaller than the above range, light extraction efficiency may decrease or a dark portion may occur. When the angle c1 and the inner angle are smaller than the above range, light reflection efficiency may decrease and a hot spot suppression region may be small.

The upper surface region of the recess portion <NUM> may be <NUM>% or more of the upper surface area of the light emitting device <NUM> and, in accordance with the invention, ranges from <NUM>% to <NUM>% of the upper surface area of the light emitting device <NUM>. When the upper surface area of the recess portion <NUM> is smaller than the above range, the hot spot suppression effect is insignificant, and when the upper surface area is larger than the above range, a dark portion may occur. The upper surface width b1 of the recess portion <NUM> may be <NUM>% or more or in a range of <NUM>% to <NUM>% of the upper surface width b0 of the light emitting device <NUM>. The upper surface width b1 of the recess portion <NUM> may be smaller or larger than the upper surface width b0 of the light emitting device <NUM>. When the upper surface area of the recess portion <NUM> is less than <NUM>%, the recess portion <NUM> may be disposed in a region facing the upper surface of the light emitting device <NUM>.

The depth b2 or height of the recess portion <NUM> may be smaller than the distance d1 or the shortest distance between the light emitting device <NUM> and the recess portion <NUM>. In accordance with the claimed invention, the distance d1 or the shortest distance between the light emitting device <NUM> and the recess portion <NUM> ranges from <NUM> to <NUM> times the thickness t0 of the light emitting device <NUM>. When the distance d1 or the shortest distance is smaller than the above range, a dark portion may be generated, and when it is larger than the above range, hot spot control may become difficult. The depth b2 or height of the recess portion <NUM> may vary depending on the inclination angle c1 and the size of the light emitting device <NUM>. The recess portion <NUM> may have a horn shape. The recess portion <NUM> may have an inverted polygonal horn shape or an inverted circular cone shape. The recess portion <NUM> may have an inverted truncated cone shape.

The recess portion <NUM> may be gradually closer to the light emitting device <NUM> toward the center or the vertex r2. At this time, since the recess portion <NUM> has an inner angle of the vertex r2 in the range of <NUM> to <NUM> degrees, light transmitted to the vertex r2 facing the light emitting device <NUM> may be minimized and the amount of light extracted through the side surface r1 connected to the vertex r2 or disposed around the upper circumference thereof may be increased. These recess portions <NUM> may reflect incident light in a lateral direction.

As shown in <FIG> and <FIG>, the recess portion <NUM> has an inverted polygonal pyramid shape, and the inverted polygonal pyramid shape may have a square cone shape. As another example, the recess portion <NUM> as shown in <FIG> may have a triangular pyramid shape, a pentagonal pyramid shape as shown in <FIG>, or an inverted cone shape as shown in <FIG>. That is, when the recess portion <NUM> has a polygonal pyramid shape, the side surface r1 of the recess portion <NUM> may be larger or smaller than the number of side surfaces s1 of the light emitting device <NUM>. When the recess portion <NUM> has a polygonal side surface r1, a directivity characteristic for reflected light may be provided, and in the case of a cone shape, it may be reflected in all directions. Since the inner portion r0 of the recess portion <NUM> is provided as a concave empty space, light incident due to a difference in refractive index from the resin layer <NUM> may be refracted or reflected. The shape of the inner portion r0 of the recess portion <NUM> may be a polygonal cone shape or a conical shape.

Each side surface r1 of the recess portion <NUM> may be disposed in the same direction as each side surface s1 of the light emitting device <NUM>. The edge between each side surface r1 of the recess portion <NUM> may be disposed at a position corresponding to the edge between each side surface s1 of the light emitting device <NUM>. The edge of the upper surface of the recess portion <NUM> and the edge of the upper surface of the light emitting device <NUM> may extend or be disposed in the same direction. When the upper surface area of the recess portion <NUM> is less than <NUM>% of the upper surface area of the light emitting device <NUM>, for example, in a range of <NUM>% to <NUM>%, each side surface r1 of the recess portion <NUM> may overlap the upper surface of the light emitting device <NUM> in a vertical direction. The recess portion <NUM> may have an inclination angle c1 of the side surface r1 of <NUM> degrees or more, for example, in a range of <NUM> to <NUM> degrees. Accordingly, light directed upward through the upper surface of the light emitting device <NUM> may be effectively reflected by each side surface r1 of the recess portion <NUM>.

<FIG> is a case in which the upper surface area of the recess portion <NUM> is smaller than the upper surface area of the light emitting device <NUM> in the lighting module of the invention. Here, the interval a3 between the light emitting devices <NUM> may be smaller than the interval a2 between the recess portions <NUM>. When the interval a3 between the light emitting devices <NUM> is the same in the first direction and the second direction, a relationship a2>a3 may be obtained in the first direction and the second direction. The upper surface width b1 of the recess portion <NUM> may be smaller than the upper surface width b0 of the light emitting device <NUM> in the first direction. The interval a2 between the recess portions <NUM> may be smaller than the pitch a1, which is an interval between the centers of the light emitting devices <NUM>. Each side surface r1 of the recess portion <NUM> may reflect the incident light as light diffused with respect to the side surface of the light emitting device <NUM>.

<FIG>, each side surface r1 or a center thereof of the recess portion <NUM> may correspond to a direction of an edge between side surfaces of the light emitting device <NUM>. Conversely, a corner portion between each side surface r1 of the recess portion <NUM> may correspond to a center portion of each side surface of the light emitting device <NUM>. Accordingly, the recess portion <NUM> may reflect light from two adjacent side surfaces r1 to the top of the light emitting device <NUM> in different directions. As shown in <FIG>, the light reflected through the side surface r1 of the recess portion <NUM> may be emitted through the upper surface of the resin layer <NUM> or may be re-reflected from the upper surface of the resin layer <NUM>. Accordingly, hot spots on the recess portion <NUM> may be suppressed.

<FIG> is a diagram illustrating a luminance distribution according to a size of a recess portion in a lighting module according to an embodiment of the invention. (a) of <FIG> shows the case where the upper surface area of the recess portion is the same as the upper surface area of the light emitting device, (b) of <FIG> shows the case where the upper surface area of the recess portion is <NUM>% of the upper surface area of the light emitting device, and (c) of <FIG> shows the case where the upper surface area of the recess portion is <NUM>% of the upper surface area of the light emitting device. As shown in (a) of <FIG>, when the upper surface area of the recess portion is the same as the size of the light emitting device, it may be seen that hot spots or dark portions on the light emitting device are suppressed. As shown in (b)(c) of <FIG>, since the upper surface area of the recess portion is more than twice the size of the light emitting device, it may be seen that dark portions are generated on the light emitting device. Accordingly, in the embodiment of the invention, the upper surface area of the recess portion is provided in the range of <NUM>% to <NUM>% of the upper surface area of the light emitting device, thereby reducing the occurrence of dark portions or hot spots on the light emitting device.

<FIG> are other examples of a lighting module according to an embodiment comprising some but not all features of the invention. <FIG> illustrate a case in which the upper surface area of the recess portion <NUM> is larger than the upper surface area of the light emitting device <NUM>. The upper surface area of the recess portion <NUM> may range from <NUM>% to <NUM>% of the upper surface area of the light emitting device <NUM>. The upper surface width b1 of the recess portion <NUM> may be larger than the upper surface width b0 of the light emitting device <NUM>. The recess portion <NUM> may have an inclination angle c1 of the side surface r1 of <NUM> degrees or less, for example, in a range of <NUM> degrees to <NUM> degrees. The interval a3 between the light emitting devices <NUM> may be larger than the interval a2 between the recess portions <NUM>. When the interval a3 between the light emitting devices <NUM> is the same in the first and second directions, a relationship a3>a2 may be obtained in the first and second directions. At this time, the upper surface width b1 of the recess portion <NUM> may be greater than the upper surface width b0 of the light emitting device <NUM> in the first direction. The interval a2 between the recess portions <NUM> may be smaller than the pitch a1, which is an interval between the centers of the light emitting devices <NUM>. Each side surface r1 of the recess portion <NUM> may reflect the incident light into a region wider than that of each side surface s2 of the light emitting device <NUM>. The edge between each side surface r1 of the recess portion <NUM> corresponds to the edge between each side surface s2 of the light emitting device <NUM>, or may be tilted or shifted in a range of <NUM> degree to <NUM> degrees based on the edge of the light emitting device <NUM>. In an embodiment of the invention, since each side surface r1 of the recess portion <NUM> extends more outward than the side surface s2 of the light emitting device <NUM> based on the center of the upper surface of the light emitting device <NUM>, light traveling in a vertical upward direction through the light emitting device <NUM> may be reflected in a lateral direction. Accordingly, it is possible to provide a wider pitch between the light emitting devices <NUM>.

As shown in <FIG>, the side portion 51a of the phosphor layer <NUM> may be removed. In this case, a side surface of the resin layer <NUM> may be exposed from the phosphor layer <NUM>. At least one or two or more of the side surfaces of the resin layer <NUM> may be exposed from the phosphor layer <NUM>. The lower surface area of the resin layer <NUM> may be smaller than the upper surface area of the substrate <NUM>, and a circumference of the upper surface of the substrate <NUM> may be exposed from the resin layer <NUM>.

<FIG> is a first modified example of the lighting module of <FIG> and <FIG>, and presents an embodiment of the claimed invention. Referring to <FIG>, a light shielding portion <NUM> is disposed on the light emitting device <NUM>. The light shielding portion <NUM> may include a phosphor or a diffusion agent therein. The light shielding portion <NUM> may be formed of a resin material such as silicone or epoxy. The phosphor may include at least one of blue, green, red, or yellow phosphors. The phosphor may be the same type as the phosphor added to the phosphor layer <NUM> or may be a red, green, or yellow phosphor. The diffusion agent may include at least one of PMMA (Poly Methyl Meth Acrylate) series, TiO<NUM>, SiO<NUM>, Al<NUM>O<NUM>, and silicon series. The light shielding portion <NUM> may be, for example, added with a diffusion agent. The light shielding portion <NUM> may be formed in an area equal to or larger than the upper surface of the light emitting device <NUM>. Accordingly, the light shielding portion <NUM> may partially block light traveling to the upper surface of the light emitting device <NUM>. The light shielding portion <NUM> is a white reflective material and may reduce transmittance of incident light. The light shielding portion <NUM> may be attached to the upper surface of the light emitting device <NUM>. The light shielding portion <NUM> may be disposed between the light emitting device <NUM> and the resin layer <NUM>. The light shielding portion <NUM> may overlap the recess portion <NUM> on the resin layer <NUM> in a vertical direction. Since the light shielding portion <NUM> and the recess portion <NUM> overlap the light emitting device <NUM> in a vertical direction, hot spots may be prevented. Since the light shielding portion <NUM> is disposed on the light emitting device <NUM>, the recess portion <NUM> may be disposed in a range of <NUM>% to <NUM>% of the upper surface area of the light emitting device <NUM>. The recess portion <NUM> may be disposed in a range of <NUM>% to <NUM>% of the upper surface area of the light shielding portion <NUM>. When the recess portion <NUM> is smaller than the above range, a ring-shaped hot spot may occur, and when the recess portion <NUM> is larger than the above range, a dark portion may be generated.

<FIG> is a second modified example of the lighting module of <FIG> and <FIG>, and presents a further embodiment of the invention. Referring to <FIG>, a phosphor portion <NUM> is disposed on the light emitting device <NUM>. The phosphor portion <NUM> may include a phosphor therein. The phosphor portion <NUM> may be formed of a resin material such as silicone or epoxy. The phosphor may include at least one of blue, green, red, or yellow phosphors. The phosphor may be the same type as the phosphor added to the phosphor layer <NUM> or may be a red, green, or yellow phosphor. The phosphor portion <NUM> may be disposed on an upper surface of the light emitting device <NUM> or may be disposed on an upper surface and a side surface of the light emitting device <NUM>. The phosphor portion <NUM> converts the light emitted from the light emitting device <NUM> to wavelength. The phosphor content of the phosphor portion <NUM> may be smaller than that of the phosphor added to the phosphor layer <NUM>. This suppresses a decrease in luminous intensity caused by the phosphor portion <NUM> to prevent a decrease in luminous intensity of light converted by wavelength through the phosphor layer <NUM>. The phosphor portion <NUM> may be disposed between the light emitting device <NUM> and the resin layer <NUM>. The phosphor portion <NUM> may be vertically overlapped with the recess portion <NUM> on the resin layer <NUM>. Since the phosphor portion <NUM> and the recess portion <NUM> overlap the light emitting device <NUM> in a vertical direction, hot spots may be prevented. The upper surface area of the phosphor portion <NUM> may be larger than the upper surface area of the light emitting device <NUM>. Accordingly, since the phosphor portion <NUM> is disposed on the light emitting device <NUM>, the recess portion <NUM> may be disposed in a range of <NUM>% to <NUM>% of the upper surface area of the light emitting device <NUM>. The recess portion <NUM> may be disposed in a range of <NUM>% to <NUM>% of the upper surface area of the phosphor portion <NUM>. When the recess portion <NUM> is smaller than the above range, a ring-shaped hot spot may occur, and when the recess portion <NUM> is larger than the above range, a dark portion may occur.

<FIG> is a third modified example of the lighting module of <FIG>, and <FIG> is a partially enlarged view of the lighting module of <FIG>. The lighting module having the above reflective member may be applied to the above embodiment or, in accordance with the claimed invention, to a modified example having a light shielding portion or a phosphor portion.

Referring to <FIG>, in the lighting module, a reflective member <NUM> may be disposed between the substrate <NUM> and the resin layer <NUM>. The reflective member <NUM> may not overlap the light emitting device <NUM> in a vertical direction. The reflective member <NUM> may overlap the resin layer <NUM> in a vertical direction. The height or thickness of the reflective member <NUM> may decrease or decrease from the center region toward the edge. The height of the surface of the reflective member <NUM> may gradually decrease as the distance from the recess portion <NUM> increases. The surface height of the reflective member <NUM> may increase as the distance from the light emitting devices <NUM> increases. The height of the surface of the reflective member <NUM> may be increased as it is closer to the center between the recess portions <NUM>. The reflective member <NUM> may be adhered to the upper surface of the substrate <NUM> with an adhesive or may be directly adhered. The reflective member <NUM> may be a reflective sheet or may include a reflective resin. The reflective member <NUM> may be formed of a resin body <NUM> containing silicone or epoxy, or a filler having a high refractive index, a reflective agent, or an absorbent may be added therein. The filler may include at least one of PMMA (Poly Methyl Meth Acrylate) series, TiO<NUM>, SiO<NUM>, Al<NUM>O<NUM>, and silicon series. The filler has a refractive index in the range of <NUM> to <NUM> at the emission wavelength, and the size may be in the range of <NUM> to <NUM>. The surface color of the reflective member <NUM> may be white. As another example, the reflective member <NUM> may be provided as an absorbing member, and the absorbing member may include a filler such as graphite in a resin material such as silicon or epoxy. Such an absorbing member absorbs light around the light emitting device, thereby preventing unnecessary light interference. For explanation of the invention, the reflective member <NUM> will be described as an example. The resin layer <NUM> seals the reflective member <NUM>. The resin layer <NUM> may contact the surface of the reflective member <NUM>. The lower portion 41a of the resin layer <NUM> may protrude into the reflective member <NUM>. The lower portion 41a of the resin layer <NUM> may be disposed between the reflective member <NUM> and the light emitting device <NUM>. The lower portion 41a of the resin layer <NUM> may contact the upper surface of the substrate <NUM> through a region between the reflective member <NUM> and the light emitting device <NUM>. The upper surface of the resin layer <NUM> may be disposed higher than the upper end of the reflective member <NUM>.

As shown in <FIG>, the reflective member <NUM> may include a through hole H1 into which the light emitting devices <NUM> are inserted. Although one light emitting device is inserted into each of the through holes H1, two or three or more light emitting devices may be inserted. That is, one or two or more light emitting devices may be disposed in one through hole H1. The shape of the through hole H1 may be a circular shape or a polygonal shape. The reflective member <NUM> may be disposed around each of the plurality of light emitting devices <NUM>. The reflective member <NUM> may cover the circumference of each of the light emitting devices <NUM> to reflect incident light. The height or thickness b3 of the reflective member <NUM> may be greater than the height or thickness of the light emitting device <NUM> with respect to the upper surface of the substrate <NUM>. The reflective member <NUM> may include a concave inclined surface or a curved surface having a gradually lower height as it is adjacent to the light emitting device <NUM>. Accordingly, the reflective member <NUM> reflects the light incident from the light emitting device <NUM> toward an upper portion of the light emitting device <NUM>, and the intensity of the light on the light emitting device <NUM> may be increased.

The thickness b3 of the reflective member <NUM> may be thicker than the thickness of the light emitting device <NUM> and smaller than the thickness t2 of the resin layer <NUM>. The upper end of the reflective member <NUM> may be higher than the upper surface of the light emitting device <NUM> and lower than the upper surface of the resin layer <NUM>. The thickness b3 of the reflective member <NUM> may be at least <NUM> times the thickness t2 of the resin layer <NUM>, for example, in the range of <NUM> times to <NUM> times. Since the thickness b3 of the reflective member <NUM> is disposed within the above range, light reflection efficiency may be improved and light intensity may be increased. When the thickness b3 of the reflective member <NUM> is smaller than the above range, the light reflection efficiency may decrease or the light intensity may decrease, and when the thickness b3 of the reflective member <NUM> is larger than the above range, the orientation angle may become <NUM> degrees or less or a dark portion may occur. The distance d2 between the upper ends of the reflective members <NUM> or the diameter of the recess or cavity formed by the reflective members <NUM> may be the same as the pitch of the light emitting device <NUM>.

The upper portion of the reflective member <NUM> may gradually increase as it closer to the resin layer <NUM> in the region between the light emitting devices <NUM>. The reflective member <NUM> may be formed of a reflective resin, or a reflective resin layer may be laminated on the surface of a body made of a transparent resin material. Alternatively, the reflective member <NUM> may be formed as a metal or non-metallic reflective layer on the surface of the body made of epoxy or silicone resin. The recess portion <NUM> according to an embodiment of the invention may not overlap the reflective member <NUM> in a vertical direction above the resin layer <NUM>. When the upper surface area of the recess portion <NUM> is larger than the upper surface area of the light emitting device <NUM>, the upper portion of the side surface r1 of the recess portion <NUM> may be overlapped with the lower portion of the reflective member <NUM> in a vertical direction. The recessed portion <NUM> may reflect the light proceeding upward from the light emitting device <NUM> or the light reflected by the reflective member <NUM>, thereby suppressing hot spots on the light emitting device <NUM>.

<FIG> is a diagram showing an example of a light emitting device of a lighting module according to an embodiment of the invention. Referring to <FIG>, the light emitting device disclosed in the embodiment includes a light emitting structure <NUM> and a plurality of electrodes <NUM> and <NUM>. The light emitting structure <NUM> may be formed of a compound semiconductor layer of a group II to VI element, for example, a compound semiconductor layer of a group III-V element or a compound semiconductor layer of a group II-VI element. The plurality of electrodes <NUM> and <NUM> are selectively connected to the semiconductor layer of the light emitting structure <NUM> and supply power.

The light emitting device may include a substrate <NUM>. The substrate <NUM> is disposed on the light emitting structure <NUM>. The substrate <NUM> may be, for example, a translucent, insulating substrate, or a conductive substrate. The substrate <NUM> may be, for example, at least one of sapphire (Al<NUM>O<NUM>), SiC, Si, GaAs, GaN, ZnO, Si, GaP, InP, Ge, and Ga<NUM>O<NUM>. A plurality of convex portions (not shown) are formed on at least one or both of the top surface and the bottom surface of the substrate <NUM>, thereby improving light extraction efficiency. The side cross-sectional shape of each convex portion may include at least one of a hemispherical shape, a semi-elliptic shape, or a polygonal shape. The substrate <NUM> may be removed, but is not limited thereto. At least one of a buffer layer (not shown) and a low conductivity semiconductor layer (not shown) may be included between the substrate <NUM> and the light emitting structure <NUM>. The buffer layer is a layer for reducing a difference in lattice constant between the substrate <NUM> and the semiconductor layer, and may be selectively formed from group II to group VI compound semiconductors. An undoped Group III-V compound semiconductor layer may be further formed under the buffer layer, but the embodiment is not limited thereto. The light emitting structure <NUM> may be disposed under the substrate <NUM>, and includes a first conductive type semiconductor layer <NUM>, an active layer <NUM>, and a second conductive type semiconductor layer <NUM>. Another semiconductor layer may be further disposed on at least one of the top and bottom of each of the layers <NUM>, <NUM>, and <NUM>, but the embodiment is not limited thereto. The first conductive type semiconductor layer <NUM> is disposed under the substrate <NUM> and may be implemented as a semiconductor doped with a first conductive type dopant, for example, an n-type semiconductor layer. The first conductive semiconductor layer <NUM> includes a composition formula of InxAlyGa<NUM>-x-yN (<NUM>≤x≤<NUM>, <NUM>≤y≤<NUM>, <NUM>≤x+y≤<NUM>). The first conductive type semiconductor layer <NUM> may be selected from a compound semiconductor of a group III-V element, such as GaN, AlN, AlGaN, InGaN, InN, InAlGaN, AlInN, AlGaAs, GaP, GaAs, GaAsP, and AlGaInP. The first conductive type dopant is an n-type dopant and includes a dopant such as Si, Ge, Sn, Se, and Te. The active layer <NUM> is disposed under the first conductive type semiconductor layer <NUM> and optionally includes a single quantum well, a multiple quantum well (MQW), a quantum wire structure, or a quantum dot structure, and includes a cycle of the well layer and the barrier layer. The cycle of the well layer/barrier layer is, for example, at least one of pairs of InGaN/GaN, GaN/AlGaN, AlGaN/AlGaN, InGaN/AlGaN, InGaN/InGaN, AlGaAs/GaA, InGaAs/GaAs, InGaP/GaP, AlInGaP/InGaP, and InP/GaAs. The second conductive type semiconductor layer <NUM> is disposed under the active layer <NUM>. The second conductive type semiconductor layer <NUM> includes a semiconductor doped with a second conductive type dopant, for example, the compositional formula of InxAlyGa<NUM>-x-yN (<NUM>≤x≤<NUM>, <NUM>≤y≤<NUM>, <NUM>≤x+y≤<NUM>). The second conductive type semiconductor layer <NUM> may be formed of at least one of compound semiconductors such as GaN, InN, AlN, InGaN, AlGaN, InAlGaN, AlInN, AlGaAs, GaP, GaAs, GaAsP, and AlGaInP. The second conductive type semiconductor layer <NUM> is a p-type semiconductor layer, and the first conductive dopant is a p-type dopant, and may include Mg, Zn, Ca, Sr, and Ba. As another example of the light emitting structure <NUM>, the first conductive type semiconductor layer <NUM> may be implemented as a p-type semiconductor layer, and the second conductive type semiconductor layer <NUM> may be implemented as an n-type semiconductor layer. A third conductive type semiconductor layer having a polarity opposite to that of the second conductive type may be formed under the second conductive type semiconductor layer <NUM>. In addition, the light emitting structure <NUM> may be implemented in any one of an n-p junction structure, a p-n junction structure, an n-p-n junction structure, and a p-n-p junction structure.

First and second electrodes <NUM> and <NUM> are disposed under the light emitting structure <NUM>. The first electrode <NUM> is electrically connected to the first conductive type semiconductor layer <NUM>, and the second electrode <NUM> is electrically connected to the second conductive type semiconductor layer <NUM>. The first and second electrodes <NUM> and <NUM> may have a polygonal or circular bottom shape. A plurality of recess portions <NUM> may be provided in the light emitting structure <NUM>. The light emitting device includes first and second electrode layers <NUM> and <NUM>, third electrode layers <NUM>, and insulating layers <NUM> and <NUM>. Each of the first and second electrode layers <NUM> and <NUM> may be formed as a single layer or multiple layers, and may function as a current diffusion layer. The first and second electrode layers <NUM> and <NUM> may include a first electrode layer <NUM> disposed under the light emitting structure <NUM>, and a second electrode layer <NUM> disposed under the first electrode layer <NUM>. The first electrode layer <NUM> diffuses current, and the second electrode layer <NUM> reflects incident light. The first and second electrode layers <NUM> and <NUM> may be formed of different materials. The first electrode layer <NUM> may be formed of a translucent material, for example, a metal oxide or a metal nitride. The first electrode layer <NUM> may be selectively formed among, for example, indium tin oxide (ITO), ITON (ITO nitride), IZO (indium zinc oxide), IZON (IZO nitride), IZTO (indium zinc tin oxide), IAZO (indium aluminum zinc oxide). , IGZO (indium gallium zinc oxide), IGTO (indium gallium tin oxide), AZO (aluminum zinc oxide), ATO (antimony tin oxide), GZO (gallium zinc oxide). The second electrode layer <NUM> is in contact with a lower surface of the first electrode layer <NUM> and may function as a reflective electrode layer. The second electrode layer <NUM> includes a metal such as Ag, Au, or Al. The second electrode layer <NUM> may partially contact the lower surface of the light emitting structure <NUM> when a portion of the first electrode layer <NUM> is removed. As another example, the structures of the first and second electrode layers <NUM> and <NUM> may be stacked in an omni-directional reflector layer (ODR) structure. The omni-directional reflective structure may be formed in a stacked structure of the first electrode layer <NUM> having a low refractive index and the second electrode layer <NUM> made of a highly reflective metal material in contact with the first electrode layer <NUM>. The electrode layers <NUM> and <NUM> may have, for example, a stacked structure of ITO/Ag. The omni-directional reflection angle at the interface between the first electrode layer <NUM> and the second electrode layer <NUM> may be improved. As another example, the second electrode layer <NUM> may be removed, and may be formed of a reflective layer of a different material. The reflective layer may be formed in a distributed Bragg reflector (DBR) structure, and the distributed Bragg reflector structure includes a structure in which two dielectric layers having different refractive indices are alternately disposed, for example, it is different from a SiO<NUM> layer, Each of a Si<NUM>N<NUM> layer, a TiO<NUM> layer, an Al<NUM>O<NUM> layer, and an MgO layer and may include any one of them. As another example, the electrode layers <NUM> and <NUM> may include both a distributed Bragg reflective structure and an omni-directional reflective structure, and in this case, a light emitting device having a light reflectance of <NUM>% or more may be provided. Since the light emitting device mounted in the flip method emits light reflected from the second electrode layer <NUM> through the substrate <NUM>, most of the light may be emitted in a vertical direction. The light emitted to the side of the light emitting device may be reflected by the reflective member to the light exit area through the adhesive member according to the embodiment.

The third electrode layer <NUM> is disposed under the second electrode layer <NUM> and is electrically insulated from the first and second electrode layers <NUM> and <NUM>. The third electrode layer <NUM> is formed of a metal such as at least one of titanium (Ti), copper (Cu), nickel (Ni), gold (Au), chromium (Cr), tantalum (Ta), platinum (Pt), tin (Sn), silver (Ag), and phosphorus (P). A first electrode <NUM> and a second electrode <NUM> are disposed under the third electrode layer <NUM>. The insulating layers <NUM> and <NUM> block unnecessary contact between the first and second electrode layers <NUM> and <NUM>, the third electrode layer <NUM>, the first and second electrodes <NUM> and <NUM>, and the layers of the light emitting structure <NUM>. The insulating layers <NUM> and <NUM> include first and second insulating layers <NUM> and <NUM>, and the first insulating layer <NUM> is disposed between the third electrode layer <NUM> and the second electrode layer <NUM>. The second insulating layer <NUM> is disposed between the third electrode layer <NUM> and the first and second electrodes <NUM> and <NUM>. The third electrode layer <NUM> is connected to the first conductive type semiconductor layer <NUM>. The connection part <NUM> of the third electrode layer <NUM> protrudes in a via structure through the lower portions of the first and second electrode layers <NUM> and <NUM> and the light emitting structure <NUM> and contacts the first conductive type semiconductor layer <NUM> do. The connection part <NUM> may be disposed in plurality. A portion <NUM> of the first insulating layer <NUM> extends along the recess portion <NUM> of the light emitting structure <NUM> around the connection part <NUM> of the third electrode layer <NUM>, and may block the electrically connections of the third electrode layer <NUM> and the first and second electrode layers <NUM> and <NUM>, the second conductive type semiconductor layer <NUM> and the active layer <NUM> from each other. An insulating layer may be disposed on the side surface of the light emitting structure <NUM> to protect the side surface, but is not limited thereto. The second electrode <NUM> is disposed under the second insulating layer <NUM> and contacts at least one of the first and second electrode layers <NUM> and <NUM> through the open region of the second insulating layer <NUM> or connected. The first electrode <NUM> is disposed under the second insulating layer <NUM> and is connected to the third electrode layer <NUM> through an open region of the second insulating layer <NUM>. Accordingly, the protrusion <NUM> of the second electrode <NUM> is electrically connected to the second conductive type semiconductor layer <NUM> through the first and second electrode layers <NUM> and <NUM>, and the protrusion <NUM> of the first electrode <NUM> may be electrically connected to the first conductive type semiconductor layer <NUM> through the third electrode layer <NUM>.

<FIG> is a plan view of a vehicle to which a vehicle lamp to which a lighting module is applied according to an embodiment is applied, and <FIG> is a view illustrating a vehicle lamp having a lighting module or a lighting device disclosed in the embodiment.

Referring to <FIG> and <FIG>, in the vehicle <NUM>, the rear light <NUM> may include a first lamp unit <NUM>, a second lamp unit <NUM>, a third lamp unit <NUM>, and a housing <NUM>. Here, the first lamp unit <NUM> may be a light source for the role of a direction indicator, the second lamp unit <NUM> may be a light source for the role of a vehicle width lamp, and the third lamp unit <NUM> may be a light source for the role of a brake light, but is not limited thereto. At least one or all of the first to third lamp units <NUM>, <NUM>, and <NUM> may include the lighting module disclosed in the embodiment. The housing <NUM> accommodates the first to third lamp units <NUM>, <NUM>, and <NUM>, and may be made of a light-transmitting material. At this time, the housing <NUM> may have a curvature according to the design of the vehicle body, and the first to third lamp units <NUM>, <NUM>, and <NUM> may implement a surface light source that may have a curved surface according to the shape of the housing <NUM>. Such a vehicle lamp may be applied to a turn signal lamp of a vehicle when the lamp unit is applied to a tail lamp, a brake lamp, or a turn signal lamp of a vehicle.

Features, structures, effects, and the like described in the embodiments above are included in at least one embodiment of the invention, and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, and the like illustrated in each embodiment may be combined or modified for other embodiments by a person having ordinary knowledge in the field to which the embodiments belong. Therefore, contents related to such combinations and modifications should be interpreted as being included in the scope of the invention, if they fall within the scope of the appended claims.

Claim 1:
A lighting module (<NUM>) comprising:
a substrate (<NUM>);
a plurality of light emitting devices (<NUM>) disposed on the substrate;
a resin layer (<NUM>) disposed on the substrate (<NUM>) and the plurality of light emitting devices (<NUM>);
a phosphor layer (<NUM>) disposed on the resin layer (<NUM>); and
a plurality of recess portions (<NUM>) overlapping each of the light emitting devices (<NUM>) in a vertical direction,
wherein each of the recess portions (<NUM>) is formed to be concave toward each of the light emitting devices (<NUM>) on an upper surface of the resin layer (<NUM>) and includes an inclined side surface lower than the upper surface of the resin layer (<NUM>),
characterized in that:
an upper surface area of each of the recess portions (<NUM>) includes a range of <NUM>% to <NUM>% of an upper surface area of each of the light emitting devices (<NUM>),
wherein a pitch (a1) between the light emitting devices (<NUM>) is equal to or greater than a thickness (t2) of the resin layer (<NUM>),
wherein a shortest distance (d1) between each of the light emitting devices (<NUM>) and each of the recess portions (<NUM>) is in a range of <NUM> to <NUM> times a thickness (t0) of the light emitting device (<NUM>), and
wherein the lighting module (<NUM>) comprises a light shielding portion (<NUM>) or a phosphor portion (<NUM>) disposed on an upper surface of each of the light emitting devices (<NUM>).