Light-emitting device

Abstract

To provide a light-emitting device that can reduce brightness unevenness. [Solution] A light-emitting device comprising a wiring board, a reflective member, a first light source and a second light source arranged in a first direction, a first light guide member covering the first light source, and a second light guide member covering the second light source, wherein the reflective member includes a first reflective portion covering the lower surface of the first light source, the lower surface of the second light source, the lower surface of the first light guide member, and the lower surface of the second light guide member, and a second reflective portion overlapping the first light source in the first direction and located below at least a portion of the upper surface of the first light source, and at least a portion of the partition groove located between the first light guide member and the second light guide member is defined by the first light guide member, the second light guide member, and the second reflective portion.

Description

[Technical Field]

[0001] Embodiments of the present invention relate to a light-emitting device. [Background technology]

[0002] Light-emitting devices that combine a wiring board, a light source, and a reflective member are widely used, for example, in the backlights of liquid crystal displays. For example, Patent Document 1 discloses a light-emitting device comprising a wiring board, a light source located on the wiring board, and a reflective partitioning member located above the wiring board. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2021-125453 [Overview of the project] [Problems that the invention aims to solve]

[0004] Light-emitting devices are required to further reduce brightness unevenness. The embodiment of the present invention aims to provide a light-emitting device that can reduce brightness unevenness. [Means for solving the problem]

[0005] According to one aspect of the present invention, the light-emitting device comprises a wiring board, a reflective member located above the wiring board, a first light source and a second light source located above the wiring board in a first direction, a first light guide member covering the side surface of the first light source, and a second light guide member covering the side surface of the second light source, wherein the reflective member includes a first reflective portion that covers at least a portion of the lower surface of the first light source, the lower surface of the second light source, the lower surface of the first light guide member, and the lower surface of the second light guide member in a first cross section passing through the first light source and the second light source, and a second reflective portion that overlaps with a portion of the first light source in the first direction and is located only below at least a portion of the upper surface of the first light source, wherein at least a portion of the partition groove located between the first light guide member and the second light guide member in the first cross section is defined by the first light guide member, the second light guide member, and the second reflective portion. [Effects of the Invention]

[0006] According to the light-emitting device of one embodiment of the present invention, the brightness unevenness of the light-emitting device can be reduced. [Brief explanation of the drawing]

[0007] [Figure 1] This is a schematic top view of a light-emitting device according to the first embodiment. [Figure 2] Figure 1 is a schematic cross-sectional view of the light-emitting device along line II-II. [Figure 3A] This is a schematic cross-sectional view showing a light source according to the first embodiment. [Figure 3B] This is a schematic cross-sectional view showing a modified example of the light source according to the first embodiment. [Figure 4A] This is a schematic cross-sectional view of a partition groove according to the first embodiment. [Figure 4B] This is a schematic cross-sectional view showing a first modified example of the partition groove according to the first embodiment. [Figure 4C] This is a schematic cross-sectional view showing a second modified example of the partition groove according to the first embodiment. [Figure 5] This is a schematic top view of the light source and reflective member according to the first embodiment. [Figure 6]It is a schematic cross-sectional view of a light-emitting device taken along line VI-VI of FIG. 1. [Figure 7] It is a schematic cross-sectional view of a light-emitting device according to a second embodiment. [Figure 8A] It is a schematic cross-sectional view showing a method of manufacturing a light-emitting device according to a first embodiment. [Figure 8B] It is a schematic cross-sectional view showing a method of manufacturing a light-emitting device according to a first embodiment. [Figure 8C] It is a schematic cross-sectional view showing a method of manufacturing a light-emitting device according to a first embodiment.

Embodiments for Carrying Out the Invention

[0008] Hereinafter, embodiments will be described with reference to the drawings. Since each drawing schematically shows the embodiments, the scale, interval, positional relationship, etc. of each member may be exaggerated, or illustration of a part of the member may be omitted. In this specification, the direction of the arrow on the Z-axis is taken as upward, and the direction opposite to the direction of the arrow on the Z-axis is taken as downward. Looking at an object from above is referred to as a top view, and a top view is synonymous with a plan view. Also, as a cross-sectional view, there may be a case where an end view showing only the cut surface is shown.

[0009] In the following description, components having substantially the same function are denoted by common reference numerals, and the description may be omitted. Also, terms indicating a specific direction or position (for example, "up", "down", and other terms including those terms) may be used. However, those terms are merely used for ease of understanding of the relative direction or position in the referenced drawings. As long as the relative direction or positional relationship by terms such as "up" and "down" in the referenced drawings is the same, in drawings other than the present disclosure, actual products, etc., they do not have to be arranged in the same way as in the referenced drawings. In this specification, "parallel" includes not only the case where two straight lines, sides, surfaces, etc. do not intersect even when extended, but also the case where the angle formed by two straight lines, sides, surfaces, etc. intersects within a range of 10° or less. The positional relationship expressed as "up" in this specification includes both the case where they are in contact and the case where they are not in contact but are located above.

[0010] [First Embodiment] The light-emitting device 1000 according to the first embodiment will be described with reference to FIGS. 1 to 6. FIG. 1 is a view seen from the light-emitting surface side of the light-emitting device 1000. As shown in FIG. 1, two directions that are parallel to the light-emitting surface of the light-emitting device 1000 and orthogonal to each other are defined as the X direction and the Y direction. The direction orthogonal to the X direction and the Y direction is defined as the Z direction. In this specification, a plane parallel to the X direction and the Y direction may be referred to as the XY plane. Also, a direction inclined at an angle of 0° or more and less than 360° from the X direction in the XY plane may be referred to as the lateral direction, and the Z direction may be referred to as the vertical direction.

[0011] The light-emitting device 1000 includes a wiring board 10, a reflection member 20, a light source 30, and a light guide member 40. The reflection member 20 is located above the wiring board 10. The reflection member 20 includes a first reflection portion 21 and a second reflection portion 22. The light source 30 includes a first light source 31 and a second light source 32. The first light source 31 and the second light source 32 are arranged side by side in the first direction. The first light source 31 and the second light source 32 are located above the wiring board 10. The light guide member 40 includes a first light guide member 41 and a second light guide member 42. The first light guide member 41 covers the side surface of the first light source 31. The second light guide member 42 covers the side surface of the second light source 32. A cross-section passing through the first light source 31 and the second light source 32 is referred to as the first cross-section. In the first cross-section, the first reflection portion 21 covers at least a part of the lower surface of the first light source 31. In the first cross-section, the first reflection portion 21 covers at least a part of the lower surface of the second light source 32. In the first cross-section, the first reflection portion 21 covers at least a part of the lower surface of the first light guide member 41. In the first cross-section, the first reflection portion 21 covers at least a part of the lower surface of the second light guide member 42. In the first cross-section, the second reflection portion 22 overlaps a part of the first light source 31 in the first direction. In the first cross-section, the second reflection portion 22 is located only below at least a part of the upper surface 301 of the first light source 31. In the first cross-section, a partition groove 50 is located between the first light guide member 41 and the second light guide member 42. At least a part of the partition groove 50 is defined by the first light guide member 41, the second light guide member 42, and the second reflection portion 22.

[0012] The second reflective portion 22, which defines a part of the partition groove 50, is located in the first cross-section only below at least a portion of the upper surface 301 of the first light source 31. As a result, light from the first light source 31 is more easily extracted from the surface of the first light guide member 41, which defines a part of the partition groove 50, to the outside of the light-emitting device 1000. This reduces the partition groove 50 from becoming too dark. As a result, it becomes easier to reduce brightness unevenness in the light-emitting device 1000.

[0013] The following provides a detailed explanation of each component of the light-emitting device 1000.

[0014] (Wiring board 10) The wiring board 10 is a component that supplies power to the light source 30. The wiring board 10 has an insulating base material 10S and conductive wiring 10P. The base material 10S may be a rigid substrate or a flexible substrate. In order to miniaturize the light-emitting device 1000 in the vertical direction, it is preferable that the base material 10S is a flexible substrate. The base material 10S may be composed of a single layer in the vertical direction or of a laminate of multiple layers. For example, the base material 10S may be composed of a single-layer flexible substrate or of a laminate of multiple rigid substrates. As the material for the base material 10S, for example, a resin such as polyimide can be used. The wiring board 10 has wiring 10P located on the upper and / or lower surface of the base material 10S. The number of wiring 10P on the wiring board 10 may be two, three, or four or more. The wiring 10P is a metal film, for example, a copper film. Wiring 10P can be formed by known methods such as electroplating, electroless plating, vapor deposition, and sputtering.

[0015] (Light source 30) As shown in Figure 2, the light source 30 is located above the wiring board 10. The light source 30 includes a first light source 31 and a second light source 32. The first light source 31 and the second light source 32 are located side by side in the first direction. In the light-emitting device 1000, the first direction is the same as the X direction. Also, in a top view, the direction perpendicular to the first direction is defined as the second direction. In the light-emitting device 1000, the second direction is the same as the Y direction. In the light-emitting device 1000, the vertical direction is the same as the Z direction. The first light source 31 and the second light source 32 are located above the wiring board 10 and the first reflector 21. As shown in Figure 1, the light-emitting device 1000 includes a plurality of light sources 30, including the first light source 31, the second light source 32, the third light source 33, and the fourth light source 34. Note that the number of light sources 30 included in the light-emitting device 1000 may be just one.

[0016] As shown in Figure 3A, the light source 30 includes a light-emitting element 30L. The light-emitting element 30L includes a semiconductor laminate. The semiconductor laminate includes, for example, a substrate such as sapphire or gallium nitride, an n-type semiconductor layer disposed on the substrate, a p-type semiconductor layer, and a light-emitting layer sandwiched between the n-type and p-type semiconductor layers. The light-emitting element 30L also includes an n-side electrode electrically connected to the n-type semiconductor layer and a p-side electrode electrically connected to the p-type semiconductor layer. The n-side electrode and the p-side electrode constitute a part of the lower surface of the light-emitting element 30L. Furthermore, the light source 30 includes a pair of positive and negative electrodes 30E. The pair of positive and negative electrodes 30E constitute a part of the lower surface of the light source 30. One of the pair of electrodes 30E is electrically connected to the p-side electrode, and the other is electrically connected to the n-side electrode. Note that the light source 30 does not necessarily have to include electrodes 30E. If the light source 30 does not include a pair of positive and negative electrodes 30E, the n-side electrode and p-side electrode of the light-emitting element 30L constitute a part of the lower surface of the light source 30. Furthermore, the light source 30 does not need to have a substrate such as sapphire or gallium nitride. This makes it easier to miniaturize the light source 30 in the vertical direction.

[0017] The structure of the light-emitting layer may be a double heterostructure, a single quantum well structure (SQW) with a single active layer, or a multiple quantum well structure (MQW) with a group of active layers. The light-emitting layer is capable of emitting visible light or ultraviolet light. The light-emitting layer is capable of emitting visible light from blue to red. An example of a semiconductor laminate containing such a light-emitting layer is In x Al y Ga 1-x-y N(0≦x, 0≦y, x+y≦1) may be included. The semiconductor stack may include at least one light-emitting layer capable of the above-mentioned light emission. For example, the semiconductor stack may have a structure that includes one or more light-emitting layers between an n-type semiconductor layer and a p-type semiconductor layer, or it may have a structure in which a structure containing an n-type semiconductor layer, a light-emitting layer, and a p-type semiconductor layer in sequence is repeated multiple times. When the semiconductor stack includes multiple light-emitting layers, it may include light-emitting layers with different peak wavelengths, or it may include light-emitting layers with the same peak wavelength. Note that the same peak wavelength means that there may be a variation of, for example, a few nanometers. Such combinations of light-emitting layers can be selected as appropriate. For example, when the semiconductor stack includes two light-emitting layers, the light-emitting layers can be selected in combinations such as blue light and blue light, green light and green light, red light and red light, ultraviolet light and ultraviolet light, blue light and green light, blue light and red light, or green light and red light. Furthermore, the light-emitting layer may include multiple active layers with different peak wavelengths, or it may include multiple active layers with the same peak wavelength.

[0018] The light source 30 of the first embodiment includes one light-emitting element 30L. Each of the first light source 31, second light source 32, third light source 33, and fourth light source 34 light sources 30 may include multiple light-emitting elements 30L. The peak wavelengths of the multiple light-emitting elements included in each light source 30 may be the same or different. For example, if each light source 30 includes two light-emitting elements, the peak wavelengths of the light-emitting elements can be selected from combinations such as blue light and green light, blue light and red light, ultraviolet light and blue light, ultraviolet light and green light, ultraviolet light and red light, or green light and red light. For example, if each light source 30 includes three light-emitting elements, the peak wavelengths of the light-emitting elements can be selected from combinations such as blue light and green light and red light, ultraviolet light and green light and red light, ultraviolet light and blue light and green light, ultraviolet light and blue light and red light, or ultraviolet light and green light and red light.

[0019] As shown in Figure 3A, the light source 30 may further include a light-transmitting member (hereinafter referred to as the first light source light-transmitting member 35). The first light source light-transmitting member 35 covers the top and sides of the light-emitting element 30L. The light-emitting element 30L can be protected by the first light source light-transmitting member 35. The first light source light-transmitting member 35 may be arranged so as to expose at least a portion of the top surface of the light-emitting element 30L. This makes it easier to miniaturize the light source 30 in the vertical direction.

[0020] In a cross-sectional view, the side surface of the first light source translucent member 35 may be parallel to the Z direction or inclined with respect to the Z direction. When the side surface of the first light source translucent member 35 is inclined with respect to the Z direction in a cross-sectional view, the lateral length of the first light source translucent member 35 in the cross-sectional view may be inclined such that it becomes longer towards the bottom or shorter towards the bottom. Also, a pair of side surfaces of the first light source translucent member 35 in the cross-sectional view may be inclined with respect to the Z direction at the same angle. In a cross-sectional view, the side surface of the first light source translucent member 35 may have irregularities.

[0021] For example, the first light source light-transmissive member 35 has light-transmittance with respect to the light emitted by the light-emitting element 30L. The first light source light-transmissive member 35 may contain a light-transmissive resin and may further contain a phosphor. As the light-transmissive resin, for example, a silicone resin, an epoxy resin, or the like can be used. Also, as the phosphor, yttrium aluminum garnet-based phosphors (for example, (Y,Gd)3(Al,Ga)5O 12 :Ce), lutetium aluminum garnet-based phosphors (for example, Lu3(Al,Ga)5O 12 :Ce), terbium aluminum garnet-based phosphors (for example, Tb3(Al,Ga)5O 12 :Ce), CCA-based phosphors (for example, Ca 10 (PO4)6Cl2:Eu), SAE-based phosphors (for example, Sr4Al 14 O 25 :Eu), chlorosilicate-based phosphors (for example, Ca8MgSi4O 16 Cl2:Eu), silicate-based phosphors (for example, (Ba,Sr,Ca,Mg)2SiO4:Eu), β-sialon-based phosphors (for example, (Si,Al)3(O,N)4:Eu) or α-sialon-based phosphors (for example, Ca(Si,Al) 12 (O,N) 16 :Eu) and other oxynitride-based phosphors, LSN-based phosphors (for example, (La,Y)3Si6N 11 :Ce), BSESN-based phosphors (for example, (Ba,Sr)2Si5N8:Eu), SLA-based phosphors (for example, SrLiAl3N4:Eu), CASN-based phosphors (for example, CaAlSiN3:Eu) or SCASN-based phosphors (for example, (Sr,Ca)AlSiN3:Eu) and other nitride-based phosphors, KSF-based phosphors (for example, K2SiF6:Mn), KSAF-based phosphors (for example, K2(Si 1-x Al x )F 6-x:Mn where x satisfies 0 < x < 1), or fluoride-based phosphors such as MGF-based phosphors (e.g., 3.5MgO·0.5MgF2·GeO2:Mn), quantum dots having a perovskite structure (e.g., (Cs,FA,MA)(Pb,Sn)(F,Cl,Br,I)3 where FA and MA represent formamidinium and methylammonium, respectively), II-VI group quantum dots (e.g., CdSe), III-V group quantum dots (e.g., InP), or quantum dots having a chalcopyrite structure (e.g., (Ag,Cu)(In,Ga)(S,Se)2), etc. can be used. As the phosphor added to the first light source light-transmissive member 35, one type of phosphor may be used, or a plurality of types of phosphors may be used.

[0022] Also, the wavelength conversion sheet containing the above-described phosphor may be disposed above the light-emitting device 1000. The wavelength conversion sheet can be a planar light source that absorbs a part of the blue light from the light source 30 and emits yellow light, green light, and / or red light to emit white light. For example, white light can be obtained by combining a light source 30 capable of emitting blue light and a wavelength conversion sheet containing a phosphor capable of emitting yellow light. Alternatively, a light source 30 capable of emitting blue light and a wavelength conversion sheet containing a red phosphor and a green phosphor may be combined. Further, a light source 30 capable of emitting blue light and a plurality of wavelength conversion sheets may be combined. As the plurality of wavelength conversion sheets, for example, a wavelength conversion sheet containing a phosphor capable of emitting red light and a wavelength conversion sheet containing a phosphor capable of emitting green light can be selected. Also, a light source 30 having a light-emitting element 30L capable of emitting blue light and a first light source light-transmissive member 35 containing a phosphor capable of emitting red light and a wavelength conversion sheet containing a phosphor capable of emitting green light may be combined.

[0023] For the phosphor capable of emitting yellow light used in the wavelength conversion sheet, it is preferable to use, for example, the yttrium-aluminum-garnet phosphor described above. For the phosphor capable of emitting green light used in the wavelength conversion sheet, it is preferable to use, for example, quantum dots having a perovskite structure, III-V quantum dots, or quantum dots having a chalcopyrite structure, which have a narrow full width at half maximum of the emission peak wavelength, as described above. For the phosphor capable of emitting red light used in the wavelength conversion sheet, it is preferable to use, similar to the phosphor capable of emitting green light, quantum dots having a narrow full width at half maximum of the emission peak wavelength, such as, for example, the KSF phosphor, KSAF phosphor, III-V quantum dots, or quantum dots having a chalcopyrite structure, as described above.

[0024] Furthermore, a bandpass filter that transmits light in a specific wavelength range and reflects light in other wavelength ranges may be placed between the wavelength conversion sheet and the light source 30. For example, a dichroic sheet can be used as the bandpass filter. Preferably, the bandpass filter transmits only blue light and reflects light of other colors (green light and red light). This allows only the blue light from the light source 30 to be incident on the wavelength conversion sheet, and when used in combination with a wavelength conversion sheet that absorbs a portion of the blue light from the light source 30 and emits white light, it makes it easier for the wavelength conversion sheet to emit white light. In addition, it is possible to reduce the amount of light other than blue light (e.g., green light, red light, etc.) that has been transmitted through the bandpass filter and reflected by the wavelength conversion sheet and returned to the light source 30. This reduces the brightness unevenness of the light-emitting device 1000.

[0025] Furthermore, a diffusion sheet may be placed between the bandpass filter and the light source 30. The diffusion sheet transmits light from the light source 30, and when the transmitted light is emitted from the diffusion sheet to the bandpass filter side, it can diffuse the transmitted light. This reduces brightness unevenness in the light-emitting device 1000. Preferably, the diffusion sheet is made of a material that has low absorption of light emitted by the light-emitting element 30L. Examples of diffusion sheets include polycarbonate, polystyrene, acrylic, polyethylene, etc. The diffusion sheet may have minute irregularities on its emission surface, or it may include an optical sheet with light-diffusing properties. The diffusion sheet may be made of a single layer or a laminate of multiple layers.

[0026] Furthermore, the prism sheet may be positioned opposite the light source 30 on the wavelength conversion sheet. Multiple prisms extending in one direction are arranged on the surface of the prism sheet. One prism sheet may be used, or multiple prism sheets may be stacked on top of each other. When multiple prism sheets are stacked, for example, one of them can be a prism extending in the X direction, and another can be a prism extending in the Y direction. This allows the light emitted from the prism sheet to be directed in a direction perpendicular to the emission surface of the prism sheet, thereby increasing the brightness of the light-emitting device 1000 when viewed from above.

[0027] The light source 30 may further include a covering member 36. The covering member 36 is reflective to the light emitted by the light-emitting element 30L. For example, the covering member 36 can be a resin member containing a gas such as nitrogen or oxygen, or a resin member containing light-scattering particles. As the resin member of the covering member 36, for example, thermoplastic resins such as acrylic resin, polycarbonate resin, cyclic polyolefin resin, polyethylene terephthalate resin, or polyester resin, or thermosetting resins such as epoxy resin or silicone resin can be used. As the light-scattering particles of the covering member 36, for example, particles such as titania, silica, alumina, zinc oxide, magnesium oxide, zirconia, yttria, calcium fluoride, magnesium fluoride, niobium pentoxide, barium titanate, tantalum pentoxide, barium sulfate, or glass can be used. Alternatively, the light-scattering particles of the covering member 36 may be composed of inorganic materials such as boron nitride or alkali metal silicates. The covering member 36 may contain both gas and light-scattering particles.

[0028] The covering member 36 is located below the light-emitting element 30L. The lower surface of the electrode 30E of the light source 30 is exposed from the covering member 36. The covering member 36 is also located below the first light source translucent member 35 that covers the side surface of the light-emitting element 30L.

[0029] As shown in Figure 3B, the light source 30 may include a light adjustment member (hereinafter referred to as the light source light adjustment member 37). The light source light adjustment member 37 constitutes at least a part of the upper surface 301 of the light source 30. The light source light adjustment member 37 is located above the light-emitting element 30L. In a top view, the light source light adjustment member 37 and the light-emitting element 30L overlap, and in the overlapping portion, the light source light adjustment member 37 is located above the light-emitting element 30L. The light source light adjustment member 37 is located above the first light source light-transmitting member 35 and adjusts the amount and / or direction of light emitted from the upper surface of the first light source light-transmitting member 35. The light source light adjustment member 37 has reflectivity and light transmission properties to the light emitted by the light-emitting element 30L. A portion of the light emitted from the upper surface of the first light source light-transmitting member 35 is reflected by the light source light adjustment member 37, and the other portion is transmitted through the light source light adjustment member 37. The transmittance of the light source light adjustment member 37 with respect to the peak wavelength of the light-emitting element 30L is preferably 1% to 50%, and more preferably 3% to 30%. By including the light source light adjustment member 37 in the light source 30, it is possible to reduce the area directly above the light source 30 from becoming too bright. This makes it easier to reduce brightness unevenness in the light-emitting device 1000. As the material of the light source light adjustment member 37, for example, the same material as the coating member 36 can be used. Alternatively, a metal member such as aluminum or silver, or a dielectric multilayer film may be used as the material of the light source light adjustment member 37.

[0030] As shown in Figure 3A, the light source 30 does not have to include the light source light adjustment member 37. That is, the upper surface of the light source 30 may be composed of the upper surface of the light-emitting element 30L and / or the upper surface of the first light source light-transmitting member 35. This makes it easier to miniaturize the light source 30 in the vertical direction compared to when the light source 30 includes the light source light adjustment member 37 located above the light-emitting element 30L. As for other forms of the light source 30, the light source 30 does not have to include the covering member 36. That is, the lower surface of the light source 30 may be composed of the lower surface of the light-emitting element 30L and the lower surface of the first light source light-transmitting member 35. As for other forms of the light source 30, the light source 30 may not include the first light source light-transmitting member 35 and the covering member 36, and the light source light adjustment member 37 may be located on the upper surface of the light-emitting element 30L. Other forms of the light source 30 may include a light source 30 that does not include a first light source light-transmitting member 35, with a light source light adjustment member 37 located on the upper surface of the light-emitting element 30L and a covering member 36 located on the lower surface of the light-emitting element 30L.

[0031] The shape of the light source 30 in a top view is not particularly limited. The shape of the light source 30 in a top view can be, for example, a circle, a triangle, a square, a hexagon, or an octagon. If the shape of the light source 30 in a top view is a square, the pair of outer edges of the light source 30 may be parallel to the X direction or inclined with respect to the X direction. In the first embodiment, the pair of outer edges of the light source 30 are parallel to the X direction.

[0032] (Light guide member 40) The light guide member 40 is a member that is transparent to light emitted by the light source 30. The transmittance of the light guide member 40 with respect to the peak wavelength of any light source 30 is preferably 60% or more, and more preferably 80% or more. In this specification, transmittance refers to the transmittance with respect to the peak wavelength of any light source 30. For example, the transmittance of the light guide member 40 with respect to the peak wavelength of the first light source 31 can be used. The light guide member 40 has a first surface 401 which becomes the light-emitting surface of the light-emitting device 1000, and a second surface 402 located on the opposite side of the first surface 401. As the material of the light guide member 40, for example, the same material as the resin material of the covering member 36 can be used. Alternatively, glass or the like may be used as the material of the light guide member 40. The light guide member 40 may contain phosphors and / or light-scattering particles. The maximum length of the light guide member 40 in the vertical direction is preferably, for example, 150 μm or more and 800 μm or less. The light guide member 40 may be composed of a single layer in the vertical direction, or it may be composed of a laminate of multiple layers. If the light guide member 40 is composed of a laminate, a light-transmitting adhesive may be placed between each layer. Each layer of the laminate may use a different type of main material.

[0033] The light guide member 40 includes a first light guide member 41 and a second light guide member 42. The light-emitting device 1000 comprises a plurality of light guide members 40, including a first light guide member 41, a second light guide member 42, a third light guide member 43, and a fourth light guide member 44. As shown in Figure 1, in the X direction, the first light guide member 41 and the second light guide member 42 are adjacent. In the X direction, the third light guide member 43 and the fourth light guide member 44 are adjacent. In the Y direction, the first light guide member 41 and the third light guide member 43 are adjacent. In the Y direction, the second light guide member 42 and the fourth light guide member 44 are adjacent. The first light guide member 41 covers the side of the first light source 31. The second light guide member 42 covers the side of the second light source 32. The third light guide member 43 covers the side of the third light source 33. The fourth light guide member 44 covers the side of the fourth light source 34.

[0034] As shown in Figure 2, it is preferable that the first light guide member 41 is in contact with the first light source 31. This makes it easier to extract light from the first light source 31 into the first light guide member 41. This improves the light extraction efficiency of the light-emitting device 1000. Similarly, it is preferable that the second light guide member 42 is in contact with the second light source 32.

[0035] The light guide member 40 is partitioned by a partition groove 50. One region partitioned by the partition groove 50 is defined as a light-emitting region 100A. In the first embodiment, the first light guide member 41, the second light guide member 42, the third light guide member 43, and the fourth light guide member 44, which are partitioned by the partition groove 50, are each different light-emitting regions 100A. One light-emitting region 100A can be used as a driving unit for local dimming. As shown in Figure 2, in the first cross-section, at least a portion of the partition groove 50 located between the first light guide member 41 and the second light guide member 42 is defined by the first light guide member 41 and the second light guide member 42. The number of light-emitting regions 100A constituting the light-emitting device 1000 is not particularly limited. For example, the light-emitting device 1000 may have one light-emitting region 100A, or it may have multiple light-emitting regions 100A. Alternatively, multiple light-emitting devices 1000 can be arranged to form a planar light source device with a larger area.

[0036] In the first embodiment, the light guide member 40 includes a grid-like partition groove 50 composed of a first partition groove 51 extending in the Y direction and a second partition groove 52 extending in the X direction. The first partition groove 51 extending in the Y direction is located between the first light guide member 41 and the second light guide member 42. The second partition groove 52 extending in the X direction is located between the first light guide member 41 and the third light guide member 43. The partition groove 50 penetrates from the first surface 401 to the second surface 402 of the light guide member 40. In this way, the light guide member 40 can be separated into multiple parts. This makes it easier to reduce warping of the light guide member 40 and / or the wiring board 10 caused by the difference in thermal expansion coefficients between the light guide member 40 and the wiring board 10.

[0037] It is preferable that the light guide member 40 includes a plurality of holes (hereinafter referred to as light guide holes 40A) that open to the upper side. By including light guide holes 40A in the light guide member 40, the surface area of ​​the light guide member 40 can be increased. This makes it easier to increase the amount of light extracted from the surface of the first light guide member 41 to the outside of the first light guide member 41. This makes it easier to adjust the brightness of the light emitting device 1000, and thus makes it easier to reduce brightness unevenness of the light emitting device 1000. Similarly, it is preferable that the light guide member 40, including the second light guide member 42, the third light guide member 43, and the fourth light guide member 44, includes a plurality of light guide holes 40A that open to the upper side. The depth of the light guide holes 40A in the vertical direction is, for example, 0.1 times or more and 0.9 times or less the maximum length of the light guide member 40 in the vertical direction. Furthermore, the light guide hole 40A may be a recess that opens only on the second surface 402 side, or it may be a through hole that penetrates from the first surface 401 to the second surface 402 of the light guide member 40.

[0038] The shape of the light guide hole 40A in a top view is not particularly limited. For example, as shown in Figure 1, the shape of the light guide hole 40A in a top view is circular. The light guide hole 40A in a top view may include linear portions. In this specification, linear includes straight lines, curves, or bent lines. The shape of the light guide hole 40A in a top view may be a V-shape or an L-shape extending in two directions. The shape of the light guide hole 40A in a top view may also be an ellipse, or a polygon such as a triangle, square, hexagon, or octagon.

[0039] The shape of the light guide holes 40A provided in the first light guide member 41 and the shape of the light guide holes 40A provided in the second light guide member 42 may be the same or different. Also, the number of light guide holes 40A provided in the first light guide member 41 and the number of light guide holes 40A provided in the second light guide member 42 may be the same or different. For example, before forming the light guide holes 40A in the light guide member 40, the brightness unevenness of the first light guide member 41 and the brightness unevenness of the second light guide member 42 are checked. After checking the brightness unevenness of the first light guide member 41 and the brightness unevenness of the second light guide member 42, light guide holes 40A suitable for the first light guide member 41 and the second light guide member 42 are formed in the light guide member 40. In this way, the brightness unevenness of the light-emitting device 1000 can be reduced. For example, if the brightness unevenness is kept within a desired range before the light guide hole 40A is formed in the light guide member 40, it is not necessary to provide the light guide hole 40A in the light guide member 40. As a method for checking the brightness unevenness of the first light guide member 41 and the second light guide member 42, for example, it can be checked by measuring the brightness with a two-dimensional colorimeter (Konica Minolta CA-2500).

[0040] The method for forming the light guide holes 40A in the light guide member 40 is not particularly limited. For example, the light guide holes 40A can be formed in the light guide member 40 by known methods such as laser processing or drilling. Alternatively, the light guide member 40 including the light guide holes 40A may be formed by methods such as injection molding, transfer molding, or compression molding using a mold.

[0041] (Reflective member 20) The reflective member 20 is a member that reflects light emitted by the light source 30. The reflectance of the reflective member 20 to light from the light source 30 can be, for example, 60% or more, preferably 70% or more, and more preferably 90% or more. In this specification, reflectance is the reflectance to the peak wavelength of any light source 30. For example, the reflectance of the reflective member 20 to the peak wavelength of the first light source 31 can be used. As shown in Figure 2, the reflective member 20 is located on the upper side of the wiring board 10. The reflective member 20 includes a first reflective portion 21 and a second reflective portion 22. The first reflective portion 21 and the second reflective portion 22 may be separate or may be integrally constructed. Each of the first reflective portion 21 and the second reflective portion 22 may be composed of a single layer or a laminate of multiple layers.

[0042] For example, the same material as that used for the covering member 36 can be used for the reflective member 20. The materials of the first reflective portion 21 and the second reflective portion 22 may be the same or different. For example, a resin member containing a gas such as nitrogen and / or oxygen may be used as the material for the first reflective portion 21, and a resin member containing light-scattering particles may be used as the material for the second reflective portion 22. Alternatively, resin members containing light-scattering particles may be used for both the first reflective portion 21 and the second reflective portion 22.

[0043] As shown in Figure 2, in the first cross-section, the first reflector 21 covers at least a portion of the lower surface of the first light source 31. In the first cross-section, the first reflector 21 covers at least a portion of the lower surface of the second light source 32. In the first cross-section, the first reflector 21 covers at least a portion of the lower surface of the first light guide member 41. In the first cross-section, the first reflector 21 covers at least a portion of the lower surface of the second light guide member 42. In the light-emitting device 1000, in the first cross-section, one first reflector 21 covers at least a portion of the lower surface of the first light source 31, the lower surface of the second light source 32, the lower surface of the first light guide member 41, and the lower surface of the second light guide member 42. In the first cross-section, the second reflector 22 overlaps with a portion of the first light source 31 in the first direction. Therefore, by reflecting a portion of the light from the first light source 31 by the second reflector 22, it becomes easier to reduce the amount of light from the first light source 31 entering the second light guide member 42. This makes it easier to improve the contrast between the first light guide member 41 and the second light guide member 42 when the first light source 31 is emitting light but the second light source 32 is not. As shown in Figures 2 and 4A, in the first cross-section, a portion of the partition groove 50 located between the first light guide member 41 and the second light guide member 42 is defined by the first light guide member 41, the second light guide member 42, and the second reflector 22. Also, in the first cross-section, the second reflector 22 is located only below at least a portion of the upper surface of the first light source 31. By doing so, it becomes easier to increase the surface area of ​​the first light guide member 41 that defines a portion of the partition groove 50 compared to the case where the second reflector 22 is also located above the upper surface of the first light source 31. As a result, light from the first light source 31 is more easily extracted from the surface of the first light guide member 41 that defines a portion of the partition groove 50 to the outside of the light-emitting device 1000, thus reducing the likelihood of the partition groove 50 becoming too dark. As a result, it becomes easier to reduce brightness unevenness in the light-emitting device 1000.

[0044] The second reflective section 22 is preferably an inclined surface whose surface facing the light source 30 widens upwards. This makes it easier for light from the light source 30 to be reflected by the inclined surface and travel towards the first surface 401, which is the light-emitting surface. This improves the light extraction efficiency of the light-emitting device 1000. The inclined surface may be flat or curved.

[0045] As shown in Figure 4A, in the first cross-section, a portion of the partition groove 50 located between the first light guide member 41 and the second light guide member 42 may be defined by the first reflector 21. This makes it easier to control the brightness near the partition groove 50 by adjusting the reflectance of the first reflector 21. This makes it easier to reduce brightness unevenness in the light-emitting device 1000. Furthermore, it is preferable that the second reflector 22 covering the lower surface of the first light guide member 41 and the second reflector 22 covering the lower surface of the second light guide member 42 are separated. This makes it easier to reduce warping of the second reflector 22 and / or the wiring board 10 caused by the difference in thermal expansion coefficients between the second reflector 22 and the wiring board 10. In the first cross-section, the first length L1, which is the minimum length in the vertical direction of the portion of the first reflector 21 that defines the partition groove 50, is preferably 0.1 times or more and 0.8 times or less of the second length L2, which is the maximum length in the vertical direction of the first reflector. If the first length L1 is 0.1 times or more the second length L2, the vertical length of the first reflecting part 21 defining the partition groove 50 becomes longer, making it easier to improve the mechanical strength of the light-emitting device 1000. Also, if the first length L1 is 0.8 times or less the second length L2, it becomes easier to increase the surface area of ​​the first reflecting part 21 defining the partition groove 50. This makes it easier to control the brightness near the partition groove 50 by the reflectance of the first reflecting part 21. Furthermore, the surface defining the partition groove 50 may include steps. For example, there may be a step at the boundary between the surface of the first light guide member 41 defining the partition groove 50 and the surface of the second reflecting part 22 defining the partition groove 50. Also, there may be a step at the boundary between the surface of the second reflecting part 22 defining the partition groove 50 and the surface of the first reflecting part 21 defining the partition groove 50.

[0046] As shown in Figure 4B, in the first cross-section, the second reflective portion 22 covering the lower surface of the first light guide member 41 and the second reflective portion 22 covering the lower surface of the second light guide member 42 may be connected. This makes it easier to increase the vertical length of the first reflective portion 21 and / or the second reflective portion 22 located below the partition groove 50. This makes it easier to improve the mechanical strength of the light-emitting device.

[0047] As shown in Figure 4C, the reflective member 20 may include a metal member 23 located between the first reflective portion 21 and the second reflective portion 22 in the vertical direction. Known materials such as copper, silver, gold, and aluminum can be used for the metal member 23. In the light-emitting device shown in Figure 4C, a portion of the partition groove 50 located between the first light guide member 41 and the second light guide member 42 in the first cross-section is defined by the metal member 23. This makes it easier to control the brightness near the partition groove 50 by adjusting the reflectivity of the metal member 23. This makes it easier to reduce brightness unevenness in the light-emitting device. A single-layer or multi-layer plating may be applied to part or the entire surface of the metal member 23. Known materials such as silver and gold can be used for the plating.

[0048] As shown in Figure 4A, in the first cross-section, it is preferable that the maximum length L2 of the first reflecting portion 21 in the vertical direction is longer than the maximum length L3 of the second reflecting portion 22 in the vertical direction. This makes it easier to improve the reflectivity of the first reflecting portion 21. This makes it easier to reduce the absorption of light from the light source 30 by the wiring board 10. As a result, it becomes easier to improve the light extraction efficiency of the light-emitting device 1000.

[0049] As shown in Figures 2 and 4A, it is preferable that the first reflective section 21 is in contact with the upper surface of the wiring board 10. This makes it easier to miniaturize the light-emitting device 1000 in the vertical direction. It is also preferable that the first reflective section 21 and the second reflective section 22 are in contact. This also makes it easier to miniaturize the light-emitting device 1000 in the vertical direction.

[0050] As shown in Figure 1, in a top view, it is preferable that the second reflective portion 22 does not overlap with the multiple light guide holes 40A of the first light guide member 41. This makes it easier to reduce the reduction in the vertical length of the portion of the first light guide member 41 located below the light guide holes 40A. As a result, light from the first light source 31 propagates more easily within the first light guide member 41. This makes it easier to reduce brightness unevenness in the light-emitting device 1000.

[0051] As shown in Figure 4A, it is preferable that the second reflecting portion 22 is located only below the plurality of light guide holes 40A of the first light guide member 41. This makes it easier to reduce the shortening of the vertical length of the portion of the first light guide member 41 located below the light guide holes 40A. As a result, light from the first light source 31 propagates more easily within the first light guide member 41. This makes it easier to reduce brightness unevenness in the light-emitting device 1000.

[0052] Preferably, the length of the second reflecting portion 22 in the first direction (X direction) is shorter in the second direction (Y direction) from the center side to the end side of the first light guide member 41. As shown in Figure 5, the length L4 in the first direction (X direction) of the second reflecting portion 22 located on the end side of the first light guide member 41 in the second direction (Y direction) is shorter than the length L5 in the first direction of the second reflecting portion 22 located on the center side of the first light guide member 41 in the second direction. This makes it easier to reduce the area of ​​the second reflecting portion 22 covering the lower surface of the first light guide member 41 on the end side of the first light guide member 41. As a result, it becomes easier to increase the area of ​​the longer vertical portion of the first light guide member 41 on the end side of the first light guide member 41. This makes it easier for light from the first light source 31 to propagate to the end of the first light guide member 41. As a result, it becomes easier to reduce brightness unevenness of the light emitting device 1000. In this specification, the length of the second reflecting portion 22 in the first direction refers to the length of one second reflecting portion 22 located on the central side of the first light guide member 41, if the second reflecting portion 22 that defines a part of the partition groove 50 located between the first light guide member 41 and the second light guide member 42 is separated into multiple portions. Also in this specification, the center of the first light guide member 41 refers to the geometric centroid of the first light guide member 41 in a top view.

[0053] In the first embodiment, the second reflective portion 22 defining a part of the first partition groove 51 located between the first light source 31 and the second light source 32, and the second reflective portion 22 defining a part of the second partition groove 52 located between the first light source 31 and the third light source 33, are connected. Therefore, the length of the second reflective portion 22 in the first direction (X direction) is such that the end is longer than the center of the first light guide member 41 in the second direction (Y direction). In this specification, the part of the second reflective portion 22 to which the second reflective portion 22 defining a part of the first partition groove 51 located between the first light source 31 and the second light source 32, and the second reflective portion 22 defining a part of the second partition groove 52 located between the first light source 31 and the third light source 33 are connected is referred to as the reflective connection portion 22A. As shown in Figure 5, the second reflective portion 22 includes a portion in the second direction (Y direction) from the center of the first light guide member 41 toward the reflective connection portion 22A, where its length in the first direction (X direction) decreases. Since the reflective connection portion 22A is located at the end of the first light guide member 41, the second reflective portion 22 includes a portion in the second direction (Y direction) from the center of the first light guide member 41 toward the end of the first light guide member 41, where its length in the first direction (X direction) decreases. This makes it easier for light from the first light source 31 to propagate to the end of the first light guide member 41.

[0054] Preferably, the length of the second reflecting portion 22 in the vertical direction (Z direction) is shorter in the second direction (Y direction) from the center side to the end side of the first light guide member 41. As shown in Figure 6, preferably, the length L6 in the vertical direction of the second reflecting portion located on the end side of the first light guide member 41 in the second direction (Y direction) is shorter than the length L7 in the vertical direction (Z direction) of the second reflecting portion 22 located on the center side of the first light guide member 41 in the second direction (Y direction). This makes it easier to increase the length of the first light guide member 41 in the vertical direction at the end side of the first light guide member 41. As a result, light from the first light source 31 propagates more easily to the end side of the first light guide member 41. This makes it easier to reduce brightness unevenness in the light emitting device 1000. In this specification, the vertical length of the second reflecting portion 22 refers to the vertical length of one second reflecting portion 22 located on the central side of the first light guide member 41, if the second reflecting portion 22 that defines a part of the partition groove 50 located between the first light guide member and the second light guide member is separated into multiple portions.

[0055] As shown in Figure 6, the second reflective portion 22 includes a portion in the second direction (Y direction) from the center of the first light guide member 41 toward the reflective connection portion 22A, in which the length in the vertical direction (Z direction) decreases. Since the reflective connection portion 22A is located at the end of the first light guide member 41, the second reflective portion 22 includes a portion in the second direction (Y direction) from the center of the first light guide member 41 toward the end of the first light guide member 41, in which the length in the vertical direction (Z direction) decreases. This makes it easier for light from the first light source 31 to propagate to the end of the first light guide member 41.

[0056] Preferably, the vertical length of the first reflective portion located in the overlapping area of ​​the first compartment groove 51 extending in the Y direction and the second compartment groove 52 extending in the X direction is shorter than the vertical length of the first reflective portion located in the area that does not overlap with either the first or second compartment groove 51. This makes it easier to increase the surface area of ​​the first reflective portion 21 that defines the compartment groove 50 in the overlapping area of ​​the first compartment groove 51 and the second compartment groove 52 extending in the X direction. This makes it easier to control the brightness near the compartment groove 50 by the reflectance of the first reflective portion 21.

[0057] As shown in Figure 2, the first reflective portion 21 of the first embodiment has a plurality of through holes (hereinafter referred to as reflective through holes). The reflective through holes of the first reflective portion 21 include a first inclined surface 21A that widens upward. In the first cross-section, the first inclined surface 21A of the first reflective portion 21 that defines the reflective through holes is inclined such that the length of the reflective through holes in the lateral direction increases from the lower surface side of the first reflective portion 21 to the upper surface side of the first reflective portion 21. The reflective through holes of the first embodiment are circular in top view. The reflective through holes may be elliptical, or polygonal in shape such as a triangle, square, hexagon, or octagon in top view. A portion of the wiring 10P of the wiring board 10 is exposed through the reflective through holes of the reflective member 20.

[0058] The light-emitting device 1000 includes a connecting member 60 located within the reflective through-hole that electrically connects the wiring board 10 and the light source 30. The connecting member 60 includes a conductive portion 60E that has electrical conductivity and an insulating resin portion 60R. At least a portion of the conductive portion 60E is located within the reflective through-hole. The conductive portion 60E electrically connects the wiring 10P of the wiring board 10 to the light source 30. The resin portion 60R is in contact with the first inclined surface 21A, the light source 30, and the conductive portion 60E. The contact of the resin portion 60R with the first inclined surface 21A and the light source 30 makes it easier to improve the bonding strength between the light source 30 and the reflective member 20.

[0059] As the material for the conductive part 60E of the connecting member 60, known materials such as solders such as tin-bismuth, tin-copper, tin-silver, and gold-tin, conductive pastes such as silver, gold, and palladium, bumps, anisotropic conductive materials, and brazing materials such as low-melting-point metals can be used. As the base material for the resin part 60R of the conductive part 60E, for example, the same material as the resin part of the covering member 36 can be used. The resin part 60R of the connecting member 60 may contain light-scattering particles similar to those of the covering member 36. It is preferable that the resin part 60R of the connecting member 60 is adhesive. By having the adhesive resin part 60R come into contact with the reflective member 20 and the light source 30, the bonding strength between the reflective member 20 and the light source 30 can be easily improved. As the material for the adhesive resin part 60R, known materials such as rosin resins, terpene resins, petroleum resins, styrene resins, phenolic resins, xylene resins, and acrylic resins can be used. As the connecting member 60 before curing, a conductive paste containing a mixture of metal particles such as solder and flux may be used. By heating to a temperature above the melting point of the metal particles, the metal particles are melted, and then the molten metal particles harden upon cooling to form the conductive part 60E. In addition, the flux contained in the conductive paste can form the resin part 60R.

[0060] As shown in Figure 2, because the first inclined surface 21A widens upward, it becomes easier to increase the contact area between the resin part 60R and the first inclined surface 21A compared to the case where the inner surface defining the first through hole 21H of the reflective member 20 is not inclined with respect to the vertical direction (Z direction). This makes it easier to improve the bonding strength between the resin part 60R and the reflective member 20. Also, because the first inclined surface 21A widens upward, voids generated within the resin part 60R move more easily to the outside of the resin part 60R compared to the case where the first inclined surface 21A widens downward. This makes it easier to increase the contact area between the resin part 60R and the first inclined surface 21A, thus making it easier to improve the bonding strength between the resin part 60R and the reflective member 20.

[0061] It is preferable that the conductive part 60E is in contact with the first inclined surface 21A. This makes it easier to increase the volume of the conductive part 60E. As a result, heat from the light source 30 is more easily transferred to the wiring board 10 via the conductive part 60E, thereby improving the heat dissipation of the light-emitting device 1000. However, the conductive part 60E does not have to be in contact with the first inclined surface 21A. This makes it easier to increase the contact area between the first inclined surface 21A and the resin part 60R. As a result, it is easier to improve the bonding strength between the reflective member 20 and the resin part 60R.

[0062] (Light adjusting member 70) The light-emitting device 1000 includes a light-adjusting member 70. The light-adjusting member 70 has reflectivity and light transmission properties to the light emitted from the light source 30. A portion of the light emitted from the light source 30 is reflected by the light-adjusting member 70, and another portion is transmitted through the light-adjusting member 70. The transmittance of the light-adjusting member 70 with respect to the peak wavelength of the light source 30 is lower than the transmittance of the light guide member 40 with respect to the peak wavelength of the light source 30. For example, the transmittance of the light-adjusting member 70 with respect to the peak wavelength of the light source 30 is preferably 1% or more and 50% or less, and more preferably 3% or more and 30% or less. As the material of the light-adjusting member 70, for example, the same material as the covering member 36 can be used. The light-adjusting member 70 may be composed of a single layer or a laminate of multiple layers.

[0063] As shown in Figure 2, the light adjustment member 70 of the first embodiment is located above the light source 30. In a top view, a part of the light adjustment member 70 and the light source 30 overlap, and in the overlapping portion, the light adjustment member 70 is located above the light source 30. By positioning the light adjustment member 70 above the light source 30, it becomes easier to reduce the excessive brightness in the area directly above the light source 30.

[0064] The light adjustment member 70 has a third surface 701 facing the upper surface of the light source 30 and a fourth surface 702 located on the opposite side of the third surface 701. Preferably, the light adjustment member 70 has a hole (hereinafter referred to as the light adjustment hole 70A) that opens to the third surface 701 and / or the fourth surface 702. In the first embodiment, the light adjustment hole 70A is a through hole that penetrates from the third surface 701 to the fourth surface 702. The light adjustment hole 70A may be a recess that opens only to the third surface 701 side, or it may be a recess that opens only to the fourth surface 702 side. By having the light adjustment hole 70A in the light adjustment member 70, it becomes easier to adjust the brightness in the region directly above the light adjustment member 70. For example, by changing the size and position of the light adjustment hole 70A, it becomes easier to adjust the light from the light source 30 that is blocked by the light adjustment member 70. This makes it easier to adjust the brightness in the area directly above the light adjustment member 70, thereby reducing brightness unevenness in the light-emitting device 1000.

[0065] The light adjustment hole 70A of the light adjustment member 70 is preferably located away from the light source 30 when viewed from above. This makes it easier to reduce the excessive brightness in the area directly above the light source 30. The shape of the light adjustment hole 70A when viewed from above is not particularly limited. As shown in Figure 2, the shape of the light adjustment hole 70A when viewed from above may include linear portions. The shape of the light adjustment hole 70A when viewed from above may be circular, elliptical, or polygonal, such as a triangle, square, hexagon, or octagon.

[0066] In the first embodiment, the reflective member 20 and the light guide member 40 are fixed together by an adhesive member 71 positioned between the light adjusting member 70 and the light guide member 40. The adhesive member 71 is preferably translucent. This makes it easier to improve the light extraction efficiency of the light-emitting device 1000. For example, the same material as the covering member 36 can be used for the adhesive member 71. A sheet-like optical transparent adhesive (OCA) may also be used as the adhesive member 71. The light adjusting member 70 and the light guide member 40 may also be fixed in contact with each other.

[0067] [Second Embodiment] The light-emitting device 2000 of the second embodiment will be described with reference to Figure 7. Figure 7 is a schematic cross-sectional view of the same part as in Figure 2, and is a schematic cross-sectional view of the first cross-section of the light-emitting device 2000. Furthermore, unless there is a contradiction with the description and drawings of the second embodiment, the configuration and effects described in the first embodiment also apply to the second embodiment.

[0068] The light source 30 of the light-emitting device 2000 includes a light source adjustment member 37 as shown in Figure 3B. The upper surface 301 of the light source 30 of the light-emitting device 2000 is defined by the upper surface of the light source adjustment member 37.

[0069] The light-emitting device 2000 includes a first adhesive layer 72 located between the wiring board 10 and the first reflecting part 21 in the vertical direction. The wiring board 10 and the first reflecting part 21 are fixed together by the first adhesive layer 72. The first adhesive layer 72 can be made of, for example, a resin member containing light-scattering particles. As the resin member of the first adhesive layer 72, for example, a material similar to that of the resin member of the covering member 36 can be used. As the light-scattering particles of the first adhesive layer 72, for example, a material similar to that of the light-scattering particles of the covering member 36 can be used. As the first adhesive layer 72, for example, a sheet-shaped optical transparent adhesive may be used.

[0070] The reflective member 20 of the light-emitting device 2000 includes a second adhesive layer 24 located between the first reflective portion 21 and the second reflective portion 22 in the vertical direction. The first reflective portion 21 and the second reflective portion 22 are fixed by the second adhesive layer 24. The second adhesive layer 24 is also located between the first reflective portion 21 and the light guide member 40 in the vertical direction. The first reflective portion 21 and the light guide member 40 are fixed by the second adhesive layer 24. The second adhesive layer 24 can be made of the same material as the first adhesive layer 72.

[0071] The light guide member 40 of the light-emitting device 2000 has a first surface which is the upper surface and a second surface which is the lower surface, and a through hole (hereinafter referred to as the light guide through hole 40H) that opens to the first surface. The light source 30 is located within the light guide through hole 40H. The light-emitting device 2000 is equipped with a light-transmitting member 80. The light-transmitting member 80 is located within the light guide through hole 40H. The light-transmitting member 80 is in contact with the side surface of the light source 30 and the surface of the light guide member 40 that defines the light guide through hole 40H. The light-transmitting member 80 may be composed of a single layer in the vertical direction, or it may be composed of a laminate of multiple layers. The light-transmitting member 80 may also contain a phosphor or light-scattering particles. If the light-transmitting member 80 is a laminate, each layer may or may not contain a phosphor and / or light-scattering particles. For example, the light-transmitting member 80 may be composed of a layer containing a phosphor and a layer not containing a phosphor. For example, the same material as the resin material of the covering member 36 can be used as the material for the light-transmitting member 80.

[0072] The connecting member 60 of the light-emitting device 2000 has a connecting portion 60A and an extended portion 60B. The connecting portion 60A penetrates the second adhesive layer 24, the first reflective portion 21, the first adhesive layer 72, and the substrate 10S in the vertical direction. A pair of connecting members 60 are arranged apart from each other, corresponding to the positive and negative electrodes of the light source 30. The connecting portion 60A of the connecting member 60 is connected to the electrodes of the light source 30. The extended portion 60B extends from the connecting portion 60A and is electrically connected to the wiring 10P of the wiring board 10. The connecting portion 60A and the extended portion 60B can be integrally formed from the same material. For example, a conductive paste can be used as the material for the connecting member 60.

[0073] Preferably, the light-emitting device 2000 further has an insulating layer 90 that protects the lower surface of the wiring board 10. In this embodiment, the insulating layer 90 is placed on the lower surface of the base material 10S and covers the wiring 10P. As the material for the insulating layer 90, for example, epoxy resin, urethane resin, or acrylic resin can be used.

[0074] Next, an example of a manufacturing method for the light-emitting device 1000 will be described with reference to Figures 8A to 8C.

[0075] As shown in Figure 8A, an intermediate body 200 is prepared, comprising a wiring board 10 and a first intermediate reflective member 20M located above the wiring board 10. The wiring board 10 includes wiring 10P. The first intermediate reflective member 20M includes an intermediate first reflective portion 21M and an intermediate second reflective portion 22M. The intermediate first reflective portion 21M of the first intermediate reflective member 20M includes a reflective through-hole 20H. At least a portion of the wiring 10P is exposed from the reflective member 20 within the reflective through-hole 20H. A first intermediate reflective member 20M that does not include a reflective through-hole 20H may be referred to as a second intermediate reflective member. The process of preparing the intermediate body 200 may include the steps of forming a second intermediate reflective member on the wiring board 10 and forming a reflective through-hole 20H in the second intermediate reflective member. By forming a reflective through-hole 20H in the second intermediate reflective member, the first intermediate reflective member 20M can be created. The reflective through-holes 20H can be formed by known methods such as laser processing and drilling. For example, a CO2 laser may be used to form the reflective through-holes 20H. Debris generated by using the CO2 laser may be removed with a UV laser. It is optional to omit the details of how intermediate components may be prepared by acquisition or other means in each step.

[0076] After preparing the intermediate body 200, the wiring board 10 and the light source 30 are electrically connected by a connecting member 60 placed in the reflective through-hole, as shown in Figure 8B. The connecting member 60 may be placed in the reflective through-hole by, for example, injecting it into the reflective through-hole from a dispenser nozzle, or by filling the reflective through-hole with the connecting member 60 using screen printing or metal mask printing. After electrically connecting the wiring board 10 and the light source 30, an intermediate light guide member 40M is formed to cover the side of the light source 30, as shown in Figure 8C. The intermediate light guide member 40M can be formed by, for example, printing or potting. Alternatively, the intermediate light guide member 40M may be formed by embedding the light source 30 within the semi-cured intermediate light guide member 40M. In the light-emitting device 1000, after forming the intermediate light guide member 40M, a light adjustment member 70 is placed above the light source 30. The upper surface of a portion of the light guide member 40, which is located above the light source 30, and the lower surface of the light adjustment member 70 are fixed via the adhesive member 71. This allows the light adjustment member 70 to be positioned above the light source 30.

[0077] The light-emitting device 1000 shown in Figure 2 can be manufactured by forming a partition groove 50 that divides the intermediate light-guiding member 40M into a first light-guiding member 41 and a second light-guiding member 42 after forming the intermediate light-guiding member 40M. Furthermore, when forming the partition groove 50, the first reflecting part 21 and the second reflecting part 22 of the reflecting member 20 can be formed by removing a portion of the intermediate first reflecting part 21M and the intermediate second reflecting part 22M. The partition groove 50 can be formed by known methods such as blade dicing and laser dicing. In the light-emitting device 1000, since the lower side of the partition groove 50 is defined by the second reflecting part 22, for example, even if the shape of the partition groove 50 is inconsistent, it becomes easy to divide the first light-guiding member 41 and the second light-guiding member 42 and to form a partition groove 50 that is away from the wiring board 10. When forming the partition groove 50 by laser dicing, the positioning of the metal member 23 between the first reflecting portion 21 and the second reflecting portion 22, as shown in Figure 4C, makes it easier to reduce the removal of a portion of the first reflecting portion 21. This makes it easier to control the shape of the partition groove 50. This is an example of a manufacturing method for the light-emitting device 1000, and the order of the steps can be changed as long as there is no contradiction. For example, the light adjustment member 70 may be placed above the light source 30 after the partition groove has been formed. Alternatively, the intermediate second reflecting portion 22M may be formed on the intermediate first reflecting portion 21M after the wiring board 10 and the light source 30 have been electrically connected.

[0078] This specification discloses light-emitting devices as described in the following sections. [Item 1] Wiring board and A reflective member located above the aforementioned wiring board, A first light source and a second light source are located on the upper side of the wiring board, aligned in a first direction, A first light guide member covering the side surface of the first light source, The system comprises a second light guide member covering the side surface of the second light source, The reflective member includes a first reflective portion that covers at least a portion of the lower surface of the first light source, the lower surface of the second light source, the lower surface of the first light guide member, and the lower surface of the second light guide member in a first cross-section passing through the first light source and the second light source, and a second reflective portion that overlaps with a portion of the first light source in the first direction and is located only below the upper surface of the first light source. In the first cross-section, at least a portion of the partition groove located between the first light guide member and the second light guide member is a light-emitting device defined by the first light guide member, the second light guide member and the second reflector. [Item 2] A light-emitting device according to item 1, wherein a portion of the partition groove is defined by the first reflecting portion. [Item 3] The light-emitting device according to item 2, wherein in the first cross-section, the minimum length in the vertical direction of a part of the first reflecting portion defining the partition groove is 0.1 times or more and 0.8 times or less of the maximum length in the vertical direction of the first reflecting portion. [Item 4] The light-emitting device according to any one of items 1 to 3, wherein in the first cross-section, the maximum length in the vertical direction of the first reflecting portion is longer than the maximum length in the vertical direction of the second reflecting portion. [Item 5] The first light guide member includes a plurality of holes opening on the upper side, In a top view, the second reflective portion does not overlap with the plurality of holes. [Item 6] In a top view, the direction perpendicular to the first direction is defined as the second direction. The light-emitting device according to any one of items 1 to 5, wherein the length of the second reflecting portion in the first direction is shorter in the second direction from the center side to the end side of the first light guide member. [Item 7] In a top view, the direction perpendicular to the first direction is defined as the second direction. The light-emitting device according to any one of items 1 to 6, wherein the length of the second reflecting portion in the vertical direction is shorter in the second direction from the center side to the end side of the first light guide member.

[0079] The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. All forms that a person skilled in the art can implement by appropriately modifying the design based on the above-described embodiments of the present invention also fall within the scope of the present invention, insofar as they encompass the gist of the present invention. Furthermore, within the scope of the idea of ​​the present invention, a person skilled in the art can conceive of various modifications and alterations, and these modifications and alterations also fall within the scope of the present invention. [Explanation of Symbols]

[0080] 10 Wiring board 20 Reflective material 21 1st reflection section 22 2nd reflection section 30 light source 31 1st light source 32 Second light source 40 Light guide member 41 First light guide member 42 Second light guide member 50 partitioned ditches 60 Connecting Member 70 Light adjustment component 80 Translucent material 90 Insulating layer 1000, 2000 light-emitting devices

Claims

1. Wiring board and A reflective member located above the aforementioned wiring board, A first light source and a second light source are located on the upper side of the wiring board, aligned in a first direction, A first light guide member covering the side surface of the first light source, The system comprises a second light guide member covering the side surface of the second light source, The reflective member includes, in a first cross-section passing through the first light source and the second light source, a first reflective portion that covers at least a portion of the lower surface of the first light source, the lower surface of the second light source, the lower surface of the first light guide member, and the lower surface of the second light guide member, and a second reflective portion that overlaps with a portion of the first light source in the first direction and is located only below the upper surface of the first light source. In the first cross-section, at least a portion of the partition groove located between the first light guide member and the second light guide member is a light-emitting device defined by the first light guide member, the second light guide member and the second reflector.

2. The light-emitting device according to claim 1, wherein a portion of the partition groove is defined by the first reflecting portion.

3. The light-emitting device according to claim 2, wherein in the first cross-section, the minimum length in the vertical direction of a part of the first reflective portion defining the partition groove is 0.1 times or more and 0.8 times or less of the maximum length in the vertical direction of the first reflective portion.

4. The light-emitting device according to any one of claims 1 to 3, wherein, in the first cross-section, the maximum length in the vertical direction of the first reflecting portion is longer than the maximum length in the vertical direction of the second reflecting portion.

5. The first light guide member includes a plurality of holes opening on the upper side, The light-emitting device according to any one of claims 1 to 3, wherein, in a top view, the second reflective portion does not overlap with the plurality of holes.

6. In a top view, the direction perpendicular to the first direction is defined as the second direction. The light-emitting device according to any one of claims 1 to 3, wherein the length of the second reflecting portion in the first direction is shortened in the second direction from the center side to the end side of the first light guide member.

7. In a top view, the direction perpendicular to the first direction is defined as the second direction. The light-emitting device according to any one of claims 1 to 3, wherein the length of the second reflecting portion in the vertical direction is shortened in the second direction from the center side to the end side of the first light guide member.

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