Light-emitting device

Abstract

To increase optical coupling efficiency between a light-emitting device and a light guide plate.SOLUTION: A light-emitting device includes: a light-emitting element that has a top face having a long side along a first direction, a first side face parallel to the first direction, and a second side face located on a side opposite to the first side face; a translucent member that has a top face having a long side along the first direction, a first side face parallel to the first direction, and a second side face located on a side opposite to the first side face, and is arranged on the top face of the light-emitting element; and a light-reflective member that includes a first portion covering the first side face of the light-emitting element and a first side face of the translucent member, and a second portion covering the second side face of the light-emitting element and the second side face of the translucent member. The first portion of the light-reflective member has a protrusion that has a top face positioned at a place higher than the top face of the translucent member and extends in the first direction. A top face of the second portion of the light-reflective member is positioned at a place lower than the top face of the protrusion.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present disclosure relates to a light-emitting device.

Background Art

[0002] A liquid crystal display device displays an image using a light source such as a backlight. The backlight includes a light-emitting device including an LED and a light guide plate, and causes light emitted from the light-emitting device to enter from the side surface of the light guide plate and be emitted planarly from the main surface of the light guide plate. For example, Patent Document 1 discloses an LED package used as a backlight light-emitting device.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In order to realize a backlight with higher brightness, it is required to further improve the optical coupling efficiency between the light-emitting device and the light guide plate.

Means for Solving the Problems

[0005] A method for manufacturing a light-emitting device according to an embodiment of the present disclosure includes a plurality of light-emitting elements each having an emission surface with a longitudinal direction, the plurality of light-emitting elements being two-dimensionally arranged with a gap in a first direction and a second direction perpendicular to the first direction such that the longitudinal direction is along the first direction; a plurality of light-transmissive members arranged on the emission surfaces of the plurality of light-emitting elements; a composite substrate having at least side surfaces of the plurality of light-emitting elements and a light-reflective member arranged between the plurality of light-emitting elements and the plurality of light-transmissive members so as to cover side surfaces of the plurality of light-transmissive members, the light-reflective member including a pair of first portions located outside in the second direction of two adjacent light-emitting elements and two light-transmissive members in the second direction, and a second portion located between the two light-emitting elements and the two light-transmissive members, the pair of first portions each having a first upper surface, the second portion having a second upper surface, the light-transmissive member having a third upper surface, and preparing a composite substrate in which the first upper surface, the second upper surface, and the third upper surface are exposed on a main surface of the composite substrate (step A); and grinding at least a part of the pair of first portions of the light-reflective member, the second portion, and the light-transmissive members of the two light-emitting elements from the exposed first upper surface, the second upper surface, and the third upper surface, forming a convex portion having the first upper surface and extending along the first direction in the first portion, forming a fourth upper surface located lower than the first upper surface in the second portion, and forming fifth upper surfaces located below the first upper surface and at the same height as or lower than the fourth upper surface in the light-transmissive members of the two light-emitting elements (step B).

Effect of the Invention

[0006] According to an embodiment of the present disclosure, a light-emitting device with improved light coupling efficiency to a light guide plate can be provided.

Brief Description of the Drawings

[0007]

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Embodiments for Carrying Out the Invention

[0008] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The following embodiments are illustrative, and the light-emitting device according to the present disclosure is not limited to the following embodiments. For example, the numerical values, shapes, materials, steps, the order of those steps, etc. shown in the following embodiments are merely examples, and various modifications are possible as long as there is no technical contradiction. Each of the embodiments described below is merely illustrative, and various combinations are possible as long as there is no technical contradiction.

[0009] The dimensions, shapes, etc. of the components shown in the drawings may be exaggerated for clarity and may not reflect the actual dimensions, shapes, and size relationships between components in the planar light source. Also, to avoid the drawings becoming overly complex, the illustration of some elements may be omitted and shown schematically, or an end view showing only the cut surface may be shown as a cross-sectional view.

[0010] In the following description, components having substantially the same function may be denoted by a common reference numeral, and the description thereof may be omitted. In the following description, terms indicating a specific direction or position (for example, "up", "down", "right", "left", and other terms including those terms) may be used. However, those terms are used only for clarity of the relative direction or position in the referenced drawings. As long as the relative direction or position relationship by terms such as "up" and "down" in the referenced drawings is the same, in drawings other than the present disclosure, actual products, manufacturing apparatuses, etc., they do not have to be arranged in the same way as in the referenced drawings. In the present disclosure, "parallel" includes cases where two straight lines, sides, surfaces, etc. are in the range of about 0° to ±1°. Also, in the present disclosure, "perpendicular" or "orthogonal" includes cases where two straight lines, sides, surfaces, etc. are in the range of about 90° to ±1° as long as there is no other mention.

[0011] (First Embodiment)

[0012] [Structure of Light-Emitting Device 101] The light-emitting device and the method of manufacturing the light-emitting device according to this embodiment will be described. FIGS. 1 and 2 are perspective views of the light-emitting device 101 according to the first embodiment of the present disclosure, as viewed from above and below. FIGS. 3, 4, 5, and 6 are a front view, a rear view, a bottom view, and a right side view of the light-emitting device 101, respectively. FIGS. 7 and 8 are cross-sectional views taken along lines VII-VII and VIII-VIII shown in FIG. 3 of the light-emitting device 101, respectively.

[0013] In these figures, for reference, arrows indicating the X direction, the Y direction, and the Z direction that are perpendicular to each other are shown together. The X direction and the Y direction are also referred to as the first direction and the second direction.

[0014] Also, when explaining the shape of a component and the positional relationship between components, the relatively positive side in the Z direction may be regarded as "up" or "high", and the negative side as "down" or "low". For example, when a component has two surfaces perpendicular to the Z direction, the surface located on the relatively positive side may be called the upper surface, and the surface located on the relatively negative side may be called the lower surface.

[0015] The light-emitting device 101 includes one or more light-emitting elements. In this embodiment, as shown in FIGS. 7 and 8, the light-emitting device 101 includes a first light-emitting element 10 and a second light-emitting element 20. The first light-emitting element 10 has an upper surface 10a, and the second light-emitting element 20 has an upper surface 20a. The upper surfaces 10a and 20a are light-emitting surfaces. The upper surfaces 10a and 20a have a length, and the first light-emitting element 10 and the second light-emitting element 20 are arranged in the longitudinal direction. In the illustrated example, the X direction is the longitudinal direction. Note that FIG. 8 is a cross-sectional view at the position of the first light-emitting element 10, but the cross-sectional structure of the first light-emitting element 10 is the same as the cross-sectional structure of the second light-emitting element 20. For this reason, for clarity, in FIG. 8, the reference numerals of the structures appearing in the cross-section of the second light-emitting element 20 are also shown in parentheses.

[0016] The light-emitting device 101 further includes a first light-transmissive member 80, a second light-transmissive member 90, and a light-reflective member 60. The first light-transmissive member 80 and the second light-transmissive member 90 are respectively located on the upper surface 10a of the first light-emitting element 10 and the upper surface 20a of the second light-emitting element 20. The light-reflective member 60 covers the side surfaces of the first light-emitting element 10, the second light-emitting element 20, the first light-transmissive member 80, and the second light-transmissive member 90. The light-emitting device 101 may further include a substrate 70 to support these components.

[0017] As shown in FIGS. 1 and 2, the light-emitting device 101 has, for example, a rectangular parallelepiped shape as a whole. The light-emitting device 101 includes a front surface 100a, a rear surface 100b located on the side opposite to the front surface 100a, a top surface 100c, a bottom surface 100d, and side surfaces 100e and 100f. The bottom surface 100d is a surface that faces a substrate that supplies power to the light-emitting device 101, such as a mounting substrate.

[0018] As shown in FIGS. 1 and 2, the front surface 100a has a rectangular shape with a length along the X direction, and the upper surfaces 80a of the first light-transmissive member 80 and 90a of the second light-transmissive member 90 are exposed. On the front surface 100a, the first light-transmissive member 80 and the second light-transmissive member 90 each have a length along the X direction, and the first light-transmissive member 80 and the second light-transmissive member 90 are arranged in the longitudinal direction.

[0019] Also, on the front surface 100a, the light-reflective member 60 surrounds the peripheries of the first light-transmissive member 80 and the second light-transmissive member 90.

[0020] As shown in FIGS. 1 and 2, the light-reflective member 60 has a convex portion 61T extending along the X direction on the top surface 100c side of the front surface 100a. As shown in FIG. 8, the convex portion 61T includes an upper surface 61Ta, and the upper surface 61Ta is located at a position higher than the upper surface 80a of the first light-transmissive member 80 and the upper surface 90a of the second light-transmissive member 90. Therefore, the light emitted from the first light-transmissive member 80 and the second light-transmissive member 90 of the light-emitting device 101 and spreading in the positive side in the Y direction is reflected by the convex portion 61T and travels in the negative side in the Y direction. Thereby, it becomes possible to make the light emitted from the light-emitting device 101 enter the side surface of the light guide plate with high light coupling efficiency. Hereinafter, the structure of the light-emitting device 101 will be described in detail.

[0021] [Substrate 70] The substrate 70 is a support member on which the first light-emitting element 10 and the second light-emitting element 20 are mounted. As shown in FIGS. 1, 2, 7, and 8, the substrate 70 is generally rectangular parallelepiped as a whole. Corresponding to the mounting of the first light-emitting element 10 and the second light-emitting element 20 along the X direction, the upper surface 75a of the substrate 70 typically has a rectangular shape that is long in the X direction compared to the Y direction in the figure.

[0022] The substrate 70 includes a base material 75 having an upper surface 75a and a lower surface 75b located on the side opposite to the upper surface 75a, a first wiring 71, a second wiring 72, a third wiring 73, and a conductive member 76. The upper surface 75a of the base material 75 is the upper surface of the substrate 70, and the lower surface 75b of the base material 75 is also the lower surface of the substrate 70. The first wiring 71 and the second wiring 72 are located on the upper surface 75a and the lower surface 75b of the base material 75, respectively. The base material further has a side surface 75d that becomes a part of the bottom surface 100d of the light-emitting device 101.

[0023] The base material 75 has a through hole 75h (FIG. 7) and a recess 75r (FIG. 8). The through hole 75h has openings on the upper surface 75a and the lower surface 75b of the base material 75 and is located inside the base material 75. The conductive member 76 is disposed in the through hole 75h, and the conductive member 76 is connected to the first wiring 71 on the upper surface 75a and the second wiring 72 on the lower surface 75b. Thereby, the first wiring 71 and the second wiring 72 are electrically connected.

[0024] As shown in FIGS. 4, 5, and 8, in this embodiment, the recess 75r is a three-dimensional shaped space obtained by bisecting a three-dimensional body formed by combining a cylinder and a cone located on the upper surface of the cylinder with the axes of the cylinder and the cone. Note that the portion corresponding to the apex of the cone may not be sharp. The recess 75r has openings in the side surface 75d and the lower surface 75b. On the lower surface 75b, it has a semi-circular shape, and on the side surface 75d, it has a pentagonal shape. As shown in FIG. 4, the recess 75 r is not connected to the through hole 75h and is separately arranged.

[0025] In this embodiment, the base material 75 has three recesses 75r. The three recesses 75r are arranged symmetrically with respect to a straight line perpendicular to the Z direction, passing through the center in the X direction of the side surface 75d.

[0026] The third wiring 73 is disposed on the inner wall of the recess 75r, and on the lower surface 75b, the third wiring 73 and the second wiring 72 are connected. Solder is disposed in the recess 75r and joined to the wiring pattern of the mounting substrate, whereby the light-emitting device 101 is joined to the mounting substrate at the bottom surface 100d. Further, the wiring pattern of the mounting substrate is electrically connected to the first wiring 71 via solder, the third wiring 73, the second wiring 72, and the conductive member 76.

[0027] The base material 75 is formed of an insulator such as resin, ceramics, or glass, for example. The base material 75 may be formed of a composite material such as a fiber-reinforced resin, and for example, a glass epoxy substrate may be used as the base material 75. Epoxy, bismaleimide triazine (BT), polyimide, or the like can be used for the base material of the base material 75. As the ceramics, aluminum oxide, aluminum nitride, zirconium oxide, zirconium nitride, titanium oxide, titanium nitride, or a mixture of one or more of these can be applied. Among these ceramics, it is advantageous to use a material having a linear expansion coefficient close to that of the light-emitting element as the material of the base material 75.

[0028] From the perspective of the strength of the base material 75, the thickness of the base material 75 in the Z direction is preferably 0.05 mm or more, more preferably 0.2 mm or more. When the thickness of the base material 75 in the Z direction is 0.6 mm or less, it is advantageous for thinning the light-emitting device. The thickness of the base material 75 in the Z direction is preferably 0.5 mm or less, more preferably 0.4 mm or less.

[0029] As materials for the first wiring 71, the second wiring 72, and the third wiring 73, copper, iron, nickel, tungsten, chromium, aluminum, silver, platinum, gold, titanium, palladium, rhodium, or an alloy containing one or more of these can be used. From the perspective of heat dissipation, it is preferable to use copper or a copper alloy as the material for these wirings. The first wiring 71, the second wiring 72, and the third wiring 73 may be formed on the base material 75 in the form of a single-layer film or in the form of a laminated film. When the outermost surface of these wirings is formed of silver, platinum, aluminum, rhodium, or gold, or an alloy containing one or more of these, high light reflectivity and good wettability with respect to solder or the like can be obtained.

[0030] The conductive member 76 can use the same material as the material for the first wiring 71, the second wiring 72, or the third wiring 73. The conductive member 76 may occupy the entire interior of the through hole 75h formed in the base material 75, or may be a conductive film disposed on a part of the interior of the through hole 75h, for example, on the surface of the through hole 75h. Further, the region surrounded by the conductive film may be filled with an insulating material such as an epoxy resin.

[0031] The substrate 70 may have an insulating layer 77. The insulating layer 77 is formed of a thermosetting resin or a thermoplastic resin and covers a part of each of the plurality of second wirings 72 located on the lower surface 75b of the base material 75. The insulating layer 77 can prevent short circuits between the second wirings 72.

[0032] [First Light-Emitting Element 10 and Second Light-Emitting Element 20] The first light-emitting element 10 and the second light-emitting element 20 are semiconductor elements that emit light by supplying current.

[0033] As shown in FIGS. 7 and 8, the first light-emitting element 10 has, for example, a rectangular parallelepiped shape having a length along the X direction. The first light-emitting element 10 has an upper surface 10a having a length along the first direction and a lower surface 10b on the side opposite to the upper surface. The upper surface 10a is the main light-emitting surface of the first light-emitting element 10. The lower surface 10b is an electrode surface. The first light-emitting element 10 further has a first side surface 10c parallel to the X direction, a second side surface 10d located on the side opposite to the first side surface 10c, a third side surface 10e connected to the first side surface 10c and the second side surface 10d, and a fourth side surface 10f located on the side opposite to the third side surface 10e. The first light-emitting element 10 also has an electrode 11 located on the lower surface 10b.

[0034] Similarly, the second light-emitting element 20 has, for example, a rectangular parallelepiped shape having a length along the X direction. The second light-emitting element 20 has an upper surface 20a having a length along the first direction and a lower surface 20b on the side opposite to the upper surface. The upper surface 20a is the main light-emitting surface of the second light-emitting element 20. The lower surface 20b is an electrode surface. The second light-emitting element 20 further has a first side surface 20c parallel to the X direction, a second side surface 20d located on the side opposite to the first side surface 20c, a third side surface 20e connected to the first side surface 20c and the second side surface 20d, and a fourth side surface 20f located on the side opposite to the third side surface 20e. The second light-emitting element 20 also has an electrode 21 located on the lower surface 20b.

[0035] The electrodes 11 and 21 include a set of a positive electrode and a negative electrode. Examples of the materials of the electrodes 11 and 21 are gold, silver, tin, platinum, rhodium, titanium, aluminum, tungsten, palladium, nickel, or an alloy containing one or more of these. The first light-emitting element 10 is mounted on the substrate 70 by connecting and fixing the electrode 11 to the first wiring 71 of the substrate 70 by a bonding member such as solder. Similarly, the second light-emitting element 20 is mounted on the substrate 70 by connecting and fixing the electrode 21 to the first wiring 71 of the substrate 70 by a bonding member such as solder.

[0036] The first light-emitting element 10 and the second light-emitting element 20 each further have a semiconductor laminate. The semiconductor laminate includes an n-type semiconductor layer, a p-type semiconductor layer, and a light-emitting layer sandwiched therebetween. The light-emitting layer may have a structure such as a double heterojunction or a single quantum well (SQW), or may have a structure having a group of active layers in one piece like a multiple quantum well (MQW). The semiconductor laminate is configured to be able to emit visible light or ultraviolet light. Such a semiconductor laminate including a light-emitting layer is, for example, In x Al y Ga 1-x-y N (0 ≦ x, 0 ≦ y, x + y ≦ 1 ) can be included.

[0037] The semiconductor laminate may have a structure including one or more light-emitting layers between the n-type semiconductor layer and the p-type semiconductor layer, or may have a structure in which a structure including an n-type semiconductor layer, a light-emitting layer, and a p-type semiconductor layer in this order is repeated a plurality of times. When the semiconductor laminate includes a plurality of light-emitting layers, it may include light-emitting layers having different emission peak wavelengths, or may include light-emitting layers having the same emission peak wavelength. Note that the same emission peak wavelength includes cases where there is a variation of about several nm. The combination of emission peak wavelengths between the plurality of light-emitting layers can be appropriately selected. For example, when the semiconductor laminate 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. Each light-emitting layer may include a plurality of active layers having different emission peak wavelengths, or may include a plurality of active layers having the same emission peak wavelength.

[0038] [First light-transmitting member 80, second light-transmitting member 90] The light-emitting device 101 includes one or more translucent members. In the present embodiment, the first translucent member 80 and the second translucent member 90 are generally plate-shaped members respectively disposed above the first light-emitting element 10 and above the second light-emitting element 20. The first translucent member 80 and the second translucent member 90 function as protective layers for the first light-emitting element 10 and the second light-emitting element 20. Also, they convert the wavelength of the light emitted from the first light-emitting element 10 and the second light-emitting element 20, or diffuse the emitted light.

[0039] As shown in FIGS. 7 and 8, the first translucent member 80 has a rectangular parallelepiped shape with a length along the X direction, similar to the first light-emitting element 10. The first translucent member 80 has an upper surface 80a having a length along the first direction and a lower surface 80b on the side opposite to the upper surface. The upper surface 80a is an emission surface through which the light emitted from the first light-emitting element 10 is emitted from the light-emitting device 101 to the outside. The lower surface 80b is located on the upper surface 10a side of the first light-emitting element 10. The first translucent member 80 further has a first side surface 80c parallel to the X direction, a second side surface 80d located on the side opposite to the first side surface 80c, a third side surface 80e connected to the first side surface 80c and the second side surface 80d, and a fourth side surface 80f located on the side opposite to the third side surface 80e.

[0040] Similarly, the second translucent member 90 has a rectangular parallelepiped shape with a length along the X direction, similar to the second light-emitting element 20. The second translucent member 90 has an upper surface 90a having a length along the first direction and a lower surface 90b on the side opposite to the upper surface. The upper surface 90a is an emission surface through which the light emitted from the first light-emitting element 10 is emitted from the light-emitting device 101 to the outside. The lower surface 90b is located on the upper surface 10a side of the first light-emitting element 10. The second translucent member 90 further has a first side surface 90c parallel to the X direction, a second side surface 90d located on the side opposite to the first side surface 90c, a third side surface 90e connected to the first side surface 90c and the second side surface 90d, and a fourth side surface 90f located on the side opposite to the third side surface 90e.

[0041] In this embodiment, the first light-transmitting member 80 includes a wavelength conversion part 41 and a light-transmitting part 51. The wavelength conversion part 41 is located on the upper surface 10a side of the first light-emitting element 10, and the light-transmitting part 51 is located above the wavelength conversion part 41. Similarly, the second light-transmitting member 90 includes a wavelength conversion part 42 and a light-transmitting part 52. The wavelength conversion part 42 is located on the upper surface 20a side of the second light-emitting element 20, and the light-transmitting part 52 is located above the wavelength conversion part 42. Although the first light-transmitting member 80 and the second light-transmitting member 90 each include the wavelength conversion part 41 and the wavelength conversion part 42, the first light-transmitting member 80 and the second light-transmitting member 90 may not include the wavelength conversion part 41 and the wavelength conversion part 42 and may include only the light-transmitting part 51 and the light-transmitting part 52.

[0042] [Wavelength conversion parts 41, 42] The wavelength conversion parts 41 and 42 are each generally plate-shaped members that convert the wavelength of a part of the light emitted from the first light-emitting element 10 and the second light-emitting element 20. The wavelength conversion parts 41 and 42 contain a base material and particles of a phosphor or the like dispersed in the base material. Examples of the base material of the wavelength conversion parts 41 and 42 are silicone resin, modified silicone resin, epoxy resin, modified epoxy resin, urea resin, phenol resin, polycarbonate resin, trimethylpentene resin, polynorbornene resin, acrylic resin, urethane resin, or fluororesin, or a resin containing two or more of these. It is also possible to select glass as the base material of the wavelength conversion parts 41 and 42.

[0043] Known materials can be applied to the phosphor dispersed in the wavelength conversion parts 41 and 42. As the phosphor, yttrium aluminum garnet-based phosphors (for example, Y 3 (Al,Ga) 5 O 12 :Ce), lutetium aluminum garnet-based phosphors (for example, Lu 3 (Al,Ga) 5 O 12 :Ce), terbium aluminum garnet-based phosphors (for example, Tb 3 (Al,Ga) 5 O 12 :Ce), CCA-based phosphors (for example, Ca10 (PO 4 ) 6 Cl 2 :Eu), SAE-based phosphors (e.g., Sr 4 Al 14 O 25 :Eu), chlorosilicate-based phosphors (e.g., Ca 8 MgSi 4 O 16 Cl 2 :Eu), β-sialon-based phosphors (e.g., (Si,Al) 3 (O,N) 4 :Eu), α-sialon-based phosphors (e.g., Ca(Si,Al) 12 (O,N) 16 :Eu), SLA-based phosphors (e.g., SrLiAl 3 N 4 :Eu), CASN-based phosphors (e.g., CaAlSiN 3 :Eu) or SCASN-based phosphors (e.g., (Sr,Ca)AlSiN 3 :Eu), etc. nitride-based phosphors, KSF-based phosphors (e.g., K 2 SiF 6 :Mn), KSAF-based phosphors (e.g., K 2 (Si,Al)F 6 :Mn) or MGF-based phosphors (e.g., 3.5MgO·0.5MgF 2 ·GeO 2 :Mn), etc. fluoride-based phosphors, phosphors having a perovskite structure (e.g., CsPb(F,Cl,Br,I) 3 ), or quantum dot phosphors (e.g., CdSe, InP, AgInS 2 or AgInSe 2 ), etc. can be used.

[0044] The KSAF-based phosphor may have a composition represented by the following formula (I). M 2 [Si p Al q Mn r F s (I)

[0045] In formula (I), M represents an alkali metal and may contain at least K. Mn may be a tetravalent Mn ion. p, q, r, and s may satisfy 0.9 ≦ p + q + r ≦ 1.1, 0 < q ≦ 0.1, 0 < r ≦ 0.2, 5.9 ≦ s ≦ 6.1. Preferably, 0.95 ≦ p + q + r ≦ 1.05 or 0.97 ≦ p + q + r ≦ 1.03, 0 < q ≦ 0.03, 0.002 ≦ q ≦ 0.02 or 0.003 ≦ q ≦ 0.015, 0.005 ≦ r ≦ 0.15, 0.01 ≦ r ≦ 0.12 or 0.015 ≦ r ≦ 0.1, 5.92 ≦ s ≦ 6.05 or 5.95 ≦ s ≦ 6.025. For example, K 2 [Si 0.946 Al 0.005 Mn 0.049 F 5.995 , K 2 [Si 0.942 Al 0.008 Mn 0.050 F 5.992 , K 2 [Si 0.939 Al 0.014 Mn 0.047 F 5.986 and the like. According to such a KSAF-based phosphor, high luminance and narrow half-value width of the emission peak wavelength can be obtained for red emission.

[0046] The wavelength conversion unit 41 and the wavelength conversion unit 42 may contain different phosphors from each other. Further, the wavelength conversion units 41 and 42 may contain a light diffusing material described later.

[0047] [Light-transmitting parts 51, 52] The light-transmitting parts 51 and 52 are each formed of a resin material having, for example, a silicone resin or the like as a base material. Typically, the light-transmitting parts 51 and 52 have a transmittance of 60% or more with respect to light having the emission peak wavelength of the first light-emitting element 10 and the second light-emitting element 20. From the viewpoint of effectively using light, it is preferable that the transmittance of the light-transmitting parts 51 and 52 at the emission peak wavelength of the first light-emitting element 10 and the second light-emitting element 20 is 70% or more, and more preferably 80% or more.

[0048] For the base materials of the light-transmitting parts 51 and 52, in addition to silicone resin, for example, silicone-modified resin, epoxy resin, phenolic resin, polycarbonate resin, acrylic resin, polymethylpentene resin or polynorbornene resin, or a material containing two or more of these can be used. As the material of the light-transmitting parts 51 and 52, glass may be selected.

[0049] By dispersing a light diffusing material having a refractive index different from that of the base material in the base material, a light diffusing function may be imparted to the light-transmitting parts 51 and 52. As the light diffusing material, for example, particles of a resin having a refractive index different from that of the base material, or particles of silicon oxide, aluminum oxide, zirconium oxide or zinc oxide, etc. can be used. As the light diffusing material to be dispersed in the base material, D 50 By using nanoparticles defined by D with a particle size of 1 nm or more and 100 nm or less, scattering in the light-transmitting member can be increased.

[0050] Since the light-transmitting parts 51 and 52 cover the upper surfaces of the wavelength conversion parts 41 and 42 respectively, it is possible to suppress the wavelength conversion parts 41 and 42 from being exposed to the external environment and the phosphor from deteriorating. Also, the light wavelength-converted by the wavelength conversion parts 41 and 42 from the first light-emitting element 10 and the second light-emitting element 20 and the light not converted by the wavelength conversion parts 41 and 42 enter the light-transmitting parts 51 and 52, so non-uniformity in luminance and chromaticity is suppressed, and the mixed light can be emitted outward.

[0051] [Bonding member 30] The bonding member 30 is located between the first light-emitting element 10 and the first light-transmitting member 80, and between the second light-emitting element 20 and the second light-transmitting member 90, and bonds the first light-transmitting member 80 and the second light-transmitting member 90 to the first light-emitting element 10 and the second light-emitting element 20 respectively. The bonding member 30 may cover a part of the side surface of the first light-emitting element 10 and a part of the side surface of the second light-emitting element 20.

[0052] As the material of the joining member 30, a resin material containing a transparent resin as a base material can be used. As the base material, for example, the same material as the base materials of the light-transmissive portions 51 and 52 can be used. By dispersing a light diffusing material having a refractive index different from that of the base material, the joining member 30 may have a light diffusing function.

[0053] [Light reflective member 60] The light reflective member 60 covers the side surfaces of the first light emitting element 10 and the second light emitting element 20 and the side surfaces of the first light transmissive member 80 and the second light transmissive member 90, thereby suppressing light leakage from the side surfaces of these members and increasing the emission efficiency from the front surface of the light emitting device 101.

[0054] The light reflective member 60 includes a first portion 61 and a second portion 62. Specifically, the first portion 61 covers at least a part of the first side surface 10c of the first light emitting element 10, the first side surface 80c of the first light transmissive member 80, at least a part of the first side surface 20c of the second light emitting element 20, and the first side surface 90c of the second light transmissive member 90. The second portion 62 covers at least a part of the second side surface 10d of the first light emitting element 10, the second side surface 80d of the first light transmissive member 80, at least a part of the second side surface 20d of the second light emitting element 20, and the second side surface 90d of the second light transmissive member 90. When the joining member 30 is disposed between the first light emitting element 10 and the first light transmissive member 80 and between the second light emitting element 20 and the second light transmissive member 90, the first portion 61 and the second portion 62 further cover the joining member 30.

[0055] The light-reflective member 60 further includes a third portion 63, a fourth portion 64, and a fifth portion 65. The third portion 63 covers at least a part of the third side surface 10e of the first light-emitting element 10, the third side surface 80e of the first light-transmissive member 80, and the joining member 30. The fourth portion 64 is located between the first light-emitting element 10 and the second light-emitting element 20 in the X direction in plan view. The fourth portion 64 covers at least a part of the fourth side surface 10f of the first light-emitting element 10, the fourth side surface 80f of the first light-transmissive member 80, at least a part of the third side surface 20e of the second light-emitting element 20, the third side surface 90e of the second light-transmissive member 90, and the joining member 30. The fifth portion 65 covers at least a part of the fourth side surface 10f of the second light-emitting element 20, the fourth side surface 80f of the second light-transmissive member 90, and the joining member 30. The light-reflective member 60 may further include a sixth portion 66 that covers the lower surfaces 10b of the first light-emitting element 10 and 20b of the second light-emitting element 20. The first portion 61 and the second portion 62 are also arranged adjacent to the third portion 63, the fourth portion 64, and the fifth portion 65.

[0056] In the light-reflective member 60, the first portion 61 is adjacent to the upper surfaces 80a of the first light-transmissive member 80 and 90a of the second light-transmissive member 90 and has a convex portion 61T extending along the X direction. In the present embodiment, the convex portion 61T is also arranged adjacent to the third portion 63, the fourth portion 64, and the fifth portion 65. The convex portion 61T has an upper surface 61Ta, and the upper surface 61Ta is at a position higher than the upper surfaces 80a of the first light-transmissive member 80 and 90a of the second light-transmissive member 90. The height of the upper surface 61Ta with respect to the upper surface 90a is, for example, from 0.01 mm to 0.06 mm. Further, the second portion 62 has an upper surface 62 a that is at a position lower than the upper surface 61Ta of the convex portion 61T. In the present embodiment, the upper surface 62a is flat and is located at the same height as the upper surfaces 80a of the first light-transmissive member 80 and 90a of the second light-transmissive member 90.

[0057] The third part 63, the fourth part 64, and the fifth part 65 also each have an upper surface that is located at the same height as the upper surface 80a of the first light-transmissive member 80 and the upper surface 90a of the second light-transmissive member 90. For this reason, except for the convex portion 61T, on the front surface 100a of the light-emitting device 101, the upper surface of the light-reflective member 60, the upper surface 80a of the first light-transmissive member 80, and the upper surface 90a of the second light-transmissive member 90 constitute an integral plane.

[0058] The light-reflective member 60 is an integrally molded body composed of the first part 61, the second part 62, the third part 63, the fourth part 64, the fifth part 65, the sixth part 66, and the convex portion 61T described above, and covers the upper surface 75a of the substrate 70. However, the convex portion 61T does not have to be an integrally molded body and may be provided separately on the first part 61. The light-reflective member 60 is formed, for example, from a resin material in which a light-diffusing material is dispersed. As the base material of the light-reflective member 60, for example, silicone resin, modified silicone resin, epoxy resin, urea resin, polycarbonate resin, phenol resin, acrylic resin, urethane resin, fluororesin, or a modified resin thereof, or a resin containing two or more of these can be used. As the light-diffusing material, particles of an inorganic material or an organic material having a refractive index higher than that of the base material can be used. Examples of the light-diffusing material are particles such as titanium oxide, magnesium oxide, zirconium dioxide, potassium titanate, aluminum oxide, aluminum nitride, boron nitride, mullite, niobium oxide, barium sulfate, silicon oxide, and various rare earth oxides (for example, yttrium oxide, gadolinium oxide). The light-reflective member 60 exhibits, for example, a white color.

[0059] In this specification, "light-reflectivity" means that the reflectance at the emission peak wavelength of the light-emitting element (the first light-emitting element 10 or the second light-emitting element 20) is 60% or more. The reflectance of the light-reflective member 60 is preferably 70% or more, and more preferably 80% or more, at the emission peak wavelength of the light-emitting element.

[0060] [Effect of the light-emitting device 101] The effects of the light-emitting device 101 configured as described above will be explained. FIG. 9 is a schematic side view showing a part of the backlight 301 in which the light-emitting device 101 is incorporated. The backlight 301 includes a housing 311, a light guide plate 312, a mounting substrate 313, a support 314, and the light-emitting device 101. The light-emitting device 101 is mounted on the mounting substrate 313 at the bottom surface 100d and receives current supply from the mounting substrate 313.

[0061] The housing 311 supports the light-emitting device 101 and the light guide plate 312. The light guide plate 312 is supported by the housing 311 via the support 314 for adjusting the height position so that the front surface 100a, which is the light-emitting surface of the light-emitting device 101, faces the side surface 312c of the light guide plate 312. As shown in FIG. 9, the upper surface 61Ta of the convex portion 61T is in contact with the side surface 312c of the light guide plate 312. Therefore, a gap G is formed between the side surface 312c of the light guide plate 312 and the upper surfaces 80a of the first light-transmissive member 80 and 90a of the second light-transmissive member 90.

[0062] The light emitted from the upper surfaces 80a of the first light-transmissive member 80 and 90a of the second light-transmissive member 90 located on the front surface 100a of the light-emitting device 101 enters the light guide plate 312 from the side surface 312c. Since the side surface 312c is not in contact with the upper surfaces 80a of the first light-transmissive member 80 and 90a of the second light-transmissive member 90 and there is an air layer in between, total reflection is less likely to occur for the light incident on the side surface 312c of the light guide plate 312, and total reflection is more likely to occur for the light returning from the side surface 312c of the light guide plate 312 to the light-emitting device 101. Therefore, it is possible to make the light emitted from the light-emitting device 101 enter the light guide plate 312 with high optical coupling efficiency. Also, the light spreading from the upper surfaces 80a of the first light-transmissive member 80 and 90a of the second light-transmissive member 90 in the positive direction in the Y direction The light is reflected by the convex portion 61T and travels in the minus direction of the Y axis. As a result, the light that is obliquely emitted from the upper surface 80a of the first light-transmissive member 80 and the upper surface 90a of the second light-transmissive member 90 and travels toward the outside of the side surface 312c while passing through the gap G can be returned to the side surface 312c. Therefore, it becomes possible to make the light emitted from the light-emitting device 101 enter the side surface of the light guide plate with high optical coupling efficiency. Further, by arranging the light-emitting device 101 and the light guide plate 312 with the convex portion 61T in contact with the side surface 312c of the light guide plate 312, it becomes easy to set the interval of the gap G to be constant.

[0063] (Method for manufacturing a light-emitting device) Next, with reference to the drawings, a method for manufacturing a light-emitting device according to the present embodiment will be described. FIG. 10 is a flowchart showing the method for manufacturing a light-emitting device according to the present embodiment.

[0064] The method for manufacturing a light-emitting device according to the present embodiment includes a step (A) of preparing a composite substrate, and a step (B) of forming convex portions of a light-reflective member and upper surfaces of light-transmissive members. The method for manufacturing a light-emitting device according to the present embodiment may further include a step (C) of separating into individual pieces. Hereinafter, each step will be described in detail.

[0065] [Step (A) of preparing a composite substrate] First, a composite substrate on which a plurality of light-emitting elements, a plurality of light-transmissive members, and a light-reflective member are arranged is prepared. This step further includes a step (A1) of arranging a plurality of light-emitting elements, a step (A2) of arranging a plurality of light-transmissive members, a step (A3) of arranging a light-reflective member, and a step (A4) of exposing the light-transmissive members.

[0066] (1) Step (A1) of arranging a plurality of light-emitting elements A collective substrate is prepared, and on the collective substrate, a plurality of light-emitting elements are two-dimensionally arranged with gaps in a first direction and a second direction. In the present embodiment, on the collective substrate in which the substrates 70 shown in FIGS. 1 and 3 are two-dimensionally arranged in the X direction and the Y direction and are connected to each other, a plurality of light-emitting elements are arranged.

[0067] Figures 11 and 12 respectively show a part of the upper surface 75'a and the lower surface 75'b of such a collective substrate 70'. The collective substrate 70' includes base materials 75' that are two-dimensionally arranged in the X direction and the Y direction and are connected to each other, where the base material 75 of the substrate 70 is so arranged. As shown in FIG. 11, a first wiring 71' is arranged on the upper surface 75'a. Also, a plurality of depressions 75'r are formed in the lower surface 75'b, and a third wiring 73' is arranged in the depressions 75'r. Further, a second wiring 72' is arranged on the lower surface 75'b so as to cover the periphery of the depressions 75'r. The second wirings 72' are connected to each other in the Y direction by connection portions 72'c. Also, through holes 75h having openings in the upper surface 75'a and the lower surface 75'b are provided in the base material 75', and a conductive member 76 for connecting the first wiring 71' and the second wiring 72' is arranged in the through holes 75h. The depressions 75'r have circular openings in the lower surface 75'b. An insulating layer 77' for covering a part of the second wiring 72' is further provided on the lower surface 75'b. The collective substrate 70' can be obtained by forming a conductive film on both surfaces of a plate-shaped insulating substrate by plating or the like and then patterning the conductive film, where the base material 75' in which the depressions 75'r and the conductive member 76 are formed.

[0068] Next, a first light-emitting element 10 and a second light-emitting element 20 are prepared as a plurality of light-emitting elements. Here, a plurality of sets of the first light-emitting element 10 and the second light-emitting element 20 are prepared, and as shown in FIGS. 13 and 14, the first light-emitting element 10 and the second light-emitting element 20 are two-dimensionally arranged with gaps in the X direction and the Y direction. Specifically, using a conductive bonding member such as solder, the electrodes 11 and 21 of the first light-emitting element 10 and the second light-emitting element 20 are connected to the first wiring 71'.

[0069]

[0070] (2) Step (A2) of arranging a plurality of light-transmitting members A plurality of light-transmissive members are arranged on the emission surfaces of a plurality of light-emitting elements. Specifically, as shown in FIG. 15, an uncured bonding member is arranged on the upper surface 10a of the first light-emitting element 10 and the upper surface 20a of the second light-emitting element 20, and the first light-transmissive member 80' and the second light-transmissive member 90' are arranged on the upper surface 10a and the upper surface 20a. By curing the uncured bonding member, the first light-emitting element 10 and the first light-transmissive member 80' are bonded via the bonding member 30, and the second light-emitting element 20 and the second light-transmissive member 90' are bonded.

[0071] (3) Step of arranging a light-reflective member (A3) A light-reflective member that covers the side surfaces of the plurality of light-emitting elements and the side surfaces and upper surfaces of the plurality of light-transmissive members is arranged. Specifically, as shown in FIG. 16, an uncured light-reflective member is arranged on the side surface of the first light-emitting element 10, the side surface and the upper surface 80'a of the first light-transmissive member 80', the side surface of the second light-emitting element 20, the side surface and the upper surface 90'a of the second light-transmissive member 90', and on the upper surface 75'a of the collective substrate 70' so as to cover the bonding member 30. Thereafter, by curing the uncured light-reflective member, a light-reflective member 60' that covers the side surface of the first light-emitting element 10, the side surface and the upper surface 80'a of the first light-transmissive member 80', the side surface of the second light-emitting element 20, the side surface and the upper surface 90'a of the second light-transmissive member 90', and the bonding member 30 is obtained. FIG. 17A is a perspective view showing a part of the composite substrate 201' thus obtained, and FIG. 17B is a YZ cross-sectional view at a position crossing the first light-emitting element 10 of the composite substrate 201'. Since the cross-section crossing the second light-emitting element 20 has the same structure, the components of the second light-emitting element 20 are also shown in parentheses in FIG. 17B.

[0072] (4) Step of exposing the light-transmissive member (A4) In the composite substrate 201', the light-reflective member 60' is ground from the upper surface 60'a so that the upper surface 80'a of the first light-transmissive member 80' and the upper surface 90'a of the second light-transmissive member 90' are exposed. Specifically, the entire upper surface 60'a of the light-reflective member 60' is ground by a grinding device such as a lapping device. As a result, as shown in FIGS. 18A and 18B, a composite substrate 201 in which the upper surface 80'a of the first light-transmissive member 80' and the upper surface 90'a of the second light-transmissive member 90' are exposed on the main surface 201'a of the composite substrate 201' is obtained.

[0073] In the composite substrate 201', the first light-emitting element 10 and the second light-emitting element 20, which are a plurality of light-emitting elements, are arranged with their longitudinal directions along the X direction, and as described above, they are two-dimensionally arranged with gaps in the X direction and the Y direction.

[0074] The light-reflective member 60' is disposed between the first light-emitting element 10, the first light-transmissive member 80', the second light-emitting element 20, and the second light-transmissive member 90' so as to cover the side surfaces of the first light-emitting element 10, the first light-transmissive member 80', the second light-emitting element 20, and the second light-transmissive member 90'.

[0075] As shown in FIG. 18B, the light-reflective member 60' includes a pair of first portions 61' located outside two first light-emitting elements 10 and two first light-transmissive members 80' adjacent to each other in the Y direction, and a second portion 62' located between these two first light-emitting elements 10 and two first light-transmissive members 80'. Each of the pair of first portions 61' has an upper surface (first upper surface) 61'a, and the second portion 62' has an upper surface (second upper surface) 62'a. Further, the first light-transmissive member 80' has an upper surface (third upper surface) 80'a. Similarly, the light-reflective member 60' includes a pair of first portions 61' located outside two second light-emitting elements 20 and two second light-transmissive members 90' adjacent to each other in the Y direction, and a second portion 62' located between these two second light-emitting elements 20 and two second light-transmissive members 90'. Each of the pair of first portions 61' has an upper surface (first upper surface) 61'a, and the second portion 62' has an upper surface (second upper surface) 62'a. Further, the second light-transmissive member has an upper surface (third upper surface) 90'a. That is, by grinding the light-reflective member 60', the upper surface (first upper surface) 61'a of the first portion 61, the upper surface (second upper surface) 62'a of the second portion 62, the upper surface (third upper surface) 80'a of the first light-transmissive member 80', and the upper surface (third upper surface) 90'a of the second light-transmissive member 90' are exposed. The upper surface (first upper surface) 61'a, the upper surface (second upper surface) 62'a, and the upper surfaces (third upper surfaces) 80'a, 90'a are all flat surfaces and are located at the same height as each other. Further, the upper surface (first upper surface) 61'a, the upper surface (second upper surface) 62'a, and the upper surfaces (third upper surfaces) 80'a, 90'a constitute a continuous single flat surface. The upper surface (first upper surface) 61'a of the first portion 61, the upper surface (second upper surface) 62'a of the second portion 62, the upper surface (third upper surface) 80'a of the first light-transmissive member 80', and the upper surface (third upper surface) 90'a of the second light-transmissive member 90' are exposed.

[0076] [Step (B) of Forming the Convex Portion of the Light-Reflective Member and the Upper Surfaces of the Light-Transmissive Members] Next, at least a part of the pair of first portions 61' of the light-reflective member 60' and the second portion 62', and the upper surfaces (first upper surface) 61'a, upper surface (second upper surface) 62'a, and upper surfaces (third upper surfaces) 80'a, 90'a of the first light-transmissive member 80' on the two first light-emitting elements 10 and the second light-transmissive member 90' on the two second light-emitting elements 20 that are exposed are ground.

[0077] As shown in FIGS. 19A and 19B, by moving the rotary grinding blade (rotary cutter) 250 along the X direction with respect to the composite substrate 201’, the upper surfaces (first upper surface) 61’a, upper surfaces (second upper surface) 62’a, and upper surfaces (third upper surface) 80’a, 90’a shown in FIGS. 18A and 18B are ground to form the first portion 61’, the second portion 62’, the first light-transmissive member 80’, and the second light-transmissive member 90’. As a result, the composite substrate 201’’ shown in FIGS. 20A and 20B is obtained.

[0078] As shown in FIGS. 20A and 20B, in this process, a convex portion 61’T extending in the X direction is formed in the first portion 61’ of the light-reflective member 60’. The first portion 61’ has an upper surface (first upper surface) 61’Ta. The second portion 62’ has a new upper surface (fourth upper surface) 62a. Further, the first light-transmissive member 80 and the second light-transmissive member 90 each having a new upper surface (fifth upper surface) 80a and 90a are formed.

[0079] The upper surface (fourth upper surface) 62a is at a position lower than the upper surface (first upper surface) 61’Ta, and the upper surfaces (fifth upper surface) 80a and 90a are at the same height as the upper surface (fourth upper surface) 62, or at a position lower than the upper surface (fourth upper surface) 62a. In the present embodiment, the upper surfaces (fifth upper surface) 80a and 90a are at the same height as the upper surface (fourth upper surface) 62a and are each flat. That is, the upper surfaces (fifth upper surface) 80a and 90a and the upper surface (fourth upper surface) 62a constitute a continuous plane.

[0080] The thickness T (width) (FIG. 19B) of the rotary grinding blade 250 may be the same as the interval W between the pair of convex portions 61’T, or may be narrower. If T = W, the above-described structure can be formed by moving the rotary grinding blade 250 in the X direction only once. On the other hand, when T < W, the position of the rotary grinding blade 250 in the Y direction is changed and it is moved in the X direction two or more times. In the Y direction, grinding may be performed across the two first light-emitting elements 10 or the second light-emitting elements 20. That is, the thickness T of the rotary grinding blade 250 may be larger than the center interval between two adjacent first light-emitting elements 10 in the Y direction. For this reason, the number of movements of the rotary grinding blade 250 can be reduced.

[0081] In this embodiment, the grinding surface 250s of the rotary grinding blade 250 has a linear shape in a cross section including from one end to the other end of the rotation axis of the rotary grinding blade 250. Therefore, the surface formed by grinding becomes a flat surface.

[0082] Note that the upper surface of the light-transmissive member and the upper surface of the light-reflective member do not necessarily have to be in one plane. That is, after the step (A3) of arranging the light-reflective member, the light-reflective member may be ground at a height such that a portion that becomes the convex portion 61T remains, and then the light-reflective member and the light-transmissive member may be ground except for the portion that becomes the convex portion 61T. Also, after the step (A3) of arranging the light-reflective member, without grinding the portion that becomes the convex portion 61T, the light-reflective member and the light-transmissive member may be ground until the upper surface of the light-transmissive member is exposed, and then the portion that becomes the convex portion 61T that has not been ground may be ground. In any method, a light-emitting device can be obtained that has an upper surface at a position higher than the upper surface of the light-transmissive member and has a convex portion extending along the first direction in the first portion of the light-reflective member.

[0083] Furthermore, as another manufacturing method, in the step (A3) of arranging the light-reflective member, the light-reflective member may be arranged so as to cover the side surfaces of the plurality of light-emitting elements and the side surfaces of the plurality of light-transmissive members. In other words, in the step (A3) of arranging the light-reflective member, the light-reflective member may be arranged so as not to cover the upper surfaces of the plurality of light-transmissive members. Next, a light-reflective member may be provided on the portion that becomes the convex portion 61T. Also, finally, in order to form the upper surface 61Ta of the convex portion, the convex portion 61T may be ground or the like.

[0084] [Step (C) of Singulation] Thereafter, as indicated by the dashed lines CX1, CX2, and CY in FIGS. 20A and 20B, the obtained composite substrate 201'' is cut in the X direction and the Y direction using a rotary blade or the like so as to include the first light-transmissive member 80 and the second light-transmissive member 90, thereby manufacturing the light-emitting device 101 shown in FIGS. 1 to 8. The cutting in the X direction of the composite substrate 201'' includes the cutting CX1 of the first portion 61' and the cutting CX2 in the second portion 62'. By cutting the second portion 62, the circular depression 75'r shown in FIG. 12 is divided, and a semi-circular depression 75r is formed on the back surface 100b as shown in FIG. 4.

[0085] [Effect of the method for manufacturing a light-emitting device] According to the method for manufacturing a light-emitting device of the present embodiment, in the Y direction, since the light-transmissive member is ground across two light-emitting elements, a wide grinding blade can be used, and the light-emitting device can be manufactured efficiently. Further, the position of the grinding blade in the Y direction may be changed, and the grinding blade may be moved in the X direction any number of times two or more times. Since the Y direction corresponds to the height direction of the manufactured light-emitting device, it is possible to manufacture light-emitting devices 101 having different heights using the same manufacturing apparatus.

[0086] (Second Embodiment) FIG. 21 is a perspective view of the light-emitting device 102 of the present embodiment as viewed from above, and FIG. 22 is a YZ cross-sectional view of the light-emitting device 102. The light-emitting device 102 is different from the light-emitting device 101 of the first embodiment in that the upper surface of the light-transmissive member is a curved surface. As shown in FIG. 21, in the light-emitting device 102, the first light-transmissive member 80 and the second light-transmissive member 90 have curved upper surfaces 80a and 90a having a curvature in the Y direction. The upper surfaces 80a and 90a have a curved surface shape having a concave curve on the side of the first light-emitting element 10 and the second light-emitting element 20 in a YZ cross-section perpendicular to the X direction. As shown in FIG. 22, the upper surface 62a of the second portion 62 of the light-reflective member 60 includes a curved surface continuous with the curved surface of the upper surface 80a of the first light-transmissive member 80 and the curved surface of the upper surface 90a of the second light-transmissive member 90.

[0087] The light-emitting device 102 having such a structure can be manufactured, for example, by making the shape of the rotary grinding blade 250 different from that of the rotary grinding blade 250 of the first embodiment. As shown in FIG. 23, the grinding surface 250s of the grinding blade 250 used in this embodiment has a convex curved shape on the workpiece side in a cross section passing through the axis of the rotary grinding blade 250. In particular, at both ends in the Y direction, it has a curved shape. By using the rotary grinding blade 250 having such a shape, the first translucent member 80 and the second translucent member 90 having the upper surfaces 80a and 90a of the above-described shapes can be formed.

[0088] FIG. 24 is a perspective view of another light-emitting device 103 of this embodiment as viewed from above, and FIG. 25 is a YZ cross-sectional view of the light-emitting device 103. The light-emitting device 103 also differs from the light-emitting device 101 of the first embodiment in that the upper surface of the translucent member is a curved surface. As shown in FIG. 25, in the light-emitting device 103 the upper surface 80a of the first translucent member 80 has a first side 80aL1 adjacent to the first portion 61 and a second side 80aL2 adjacent to the second portion 62 and located at a position lower than the first side 80aL1. Further, the upper surface 80a has a curved surface shape having a convex curve on the first light-emitting element 10 side in a YZ cross section perpendicular to the X direction. Similarly, the upper surface 90a of the second translucent member 90 has a first side 90aL1 adjacent to the first portion 61 and a second side 90aL2 adjacent to the second portion 62 and located at a position lower than the first side 90aL1. Further, the upper surface 90a has a curved surface shape having a convex curve on the second light-emitting element 20 side in a YZ cross section perpendicular to the X direction.

[0089] Further, the upper surface 62a of the second portion 62 of the light-reflective member 60 includes a curved surface or a flat surface continuous with the curved surfaces of the upper surface 80a of the first translucent member 80 and the upper surface 90a of the second translucent member 90.

[0090] The light-emitting device 103 can also be manufactured by making the shape of the rotary grinding blade 250 different from that of the rotary grinding blade 250 of the first embodiment. As shown in FIG. 26, the grinding surface 250s of the grinding blade 250 used in this embodiment has a convex curved shape on the workpiece side in a cross section passing through the axis of the rotary grinding blade 250. In particular, at both ends in the Y direction, it has a curved shape. Also, as shown in the figure, the width T of the rotary grinding blade 250 is larger than the distance W2 between the centers of the first light-emitting element 10 and the second light-emitting element 20 in the Y direction. By using the rotary grinding blade 250 having such a shape, the first light-transmissive member 80 and the second light-transmissive member 90 having the upper surfaces 80a and 90a of the above-described shapes can be formed.

[0091] According to the light-emitting device 102 and the light-emitting device 103, the upper surface 80a of the first light-transmissive member 80 and the upper surface 90a of the second light-transmissive member 90 are curved surfaces, and the spread of the light emitted in the Y direction can be adjusted according to the curved surfaces. For example, in the light-emitting device 102, it is possible to reduce the spread of the light in the Y direction and make the light incident on the light guide plate.

[0092] (Other embodiments) Various modifications are possible for the light-emitting device and the method for manufacturing the light-emitting device of this embodiment. For example, in the first embodiment, the light-emitting device 101 has a convex portion 61T on the first portion 61 of the light-reflective member 60. On the other hand, the light-emitting device 104 shown in FIGS. 27 and 28 has a convex portion 62T extending along the X direction on the second portion 62 of the light-reflective member 60, that is, on the bottom surface 100d side. The light-emitting device 104 having such a structure can be manufactured by using the same method as the method for manufacturing the light-emitting device of the first embodiment and setting the position to be ground by the rotary grinding blade 250 so that the convex portion 62T is formed.

[0093] Further, for example, in the second embodiment, the upper surface of the translucent member is a curved surface. In contrast, in the first embodiment, a grinding blade is used, that is, a grinding blade having a linear shape in a cross section including from one end to the other end of the rotation axis of the rotary grinding blade 250 is used as the grinding surface 250s of the rotary grinding blade 250, and grinding is performed with the grinding blade tilted from the Z-axis direction. As a result, the upper surface of the translucent member is flat, and a light-emitting device can be obtained in which the upper surface 80a of the first translucent member 80 has a first side 80aL1 adjacent to the first portion 61 and a second side 80aL2 adjacent to the second portion 62 and located at a position lower than the first side 80aL1. As long as at least the convex portion 61T of the light-reflective member has the upper surface 61Ta, the surface formed by grinding may be a curved surface or a flat surface. In this example, the upper surface of the translucent member has an inclined surface inclined from the XY plane. The inclination angle of the inclined surface from the XY plane only needs to be an angle equal to or greater than the range of errors that can occur in grinding aimed at a desired angle, for example, 1° or more. Further, the upper surface of the light-emitting device may have an inclined surface that is inclined over the entire surface, specifically, an inclined surface that is inclined over the entire surface from the end on the first portion side to the end on the second portion side. In this case, the convex portion becomes the entire high portion in the Z direction from the first side 80aL1 of the translucent member adjacent to the first portion of the convex portion. Also, the upper surface of the convex portion is flush with the upper surface of the translucent member. By the light-emitting device having such an inclined surface, the traveling direction of the light emitted from the light-emitting device can be adjusted.

[0094] In the above embodiment, the light-emitting device included two light-emitting elements, but the light-emitting device may include one or three or more light-emitting elements. Further, in the above embodiment, independent translucent members are arranged on the light-emitting elements, respectively, but one translucent member continuously provided on two or three or more light-emitting elements may be arranged. Further, the convex portion of the first portion only needs to be located adjacent to at least the translucent member, and does not have to be arranged adjacent to the third portion, the fourth portion, and the fifth portion.

Industrial Applicability

[0095] Embodiments of the present disclosure are useful for various lighting light sources, in-vehicle light sources, display light sources, etc. In particular, it can be advantageously applied to a backlight unit for a liquid crystal display device. The light-emitting device according to the embodiments of the present disclosure can be advantageously used for a backlight for a display device of a mobile device where strict requirements for thickness reduction are imposed.

Explanation of Reference Numerals

[0096] 10 First light-emitting element 10a, 20a, 61a, 61’a, 61Ta, 62a, 62’a, Upper surface 10b, 20b Lower surface 10c, 20c, 80c, 90c First side surface 10d, 20d, 80d, 90d Second side surface 10e, 20e, 80e, 90e Third side surface 10f, 20f, 80f, 90f Fourth side surface 11, 21 Electrodes 20 Second light-emitting element 30 Bonding member 41, 42 Wavelength conversion part 51, 52 Light-transmissive part 60, 60’ Light-reflective member 61, 61’ First part 61’a First upper surface 61T, 61’T Protrusions 62, 62’ Second part 62T Protrusion 63 Third part 64 Fourth part 65 Fifth part 66 Sixth part 70 Substrate 70’ Aggregate substrate 70’a Upper surface 71, 71’ First wiring 72, 72’ Second wiring 73, 73’ Third wiring 75, 75’ Base material 75r Depression 75’r Depression 75a Upper surface 75b Lower surface 75d Side surface 75h through-hole 76 conductive member 77, 77’ insulating layer 80, 80’ first light-transmissive member 80aL1 first side 80aL2 second side 90, 90’ second light-transmissive member 90aL1 first side 90aL2 second side 90b bottom surface 90f fourth side surface 100a front surface 100b back surface 100c top surface 100d bottom surface 100e side surface 100f side surface 101~104 light-emitting device 201, 201’, 201’’ composite substrate 201’a main surface 250 rotary grinding blade 250s grinding surface 301 backlight 311 housing 312 light guide plate 312c side surface 313 mounting substrate 314 support

Claims

1. a light emitting element having a top surface having a longitudinal direction along a first direction, a first side surface parallel to the first direction, and a second side surface located opposite to the first side surface; a light-transmitting member disposed on an upper surface of the light-emitting element, the light-transmitting member having a top surface having a longitudinal direction along the first direction, a first side surface parallel to the first direction, and a second side surface located opposite to the first side surface; a light reflective member including a first portion covering the first side surface of the light emitting element and the first side surface of the light transmissive member, and a second portion covering the second side surface of the light emitting element and the second side surface of the light transmissive member; Equipped with the first portion of the light reflective member has an upper surface located higher than an upper surface of the light transmissive member and has a convex portion extending along the first direction; A light emitting device, wherein an upper surface of the second portion of the light reflective member is located lower than the upper surface of the convex portion.

2. The light emitting device according to claim 1 , wherein the upper surface of the light-transmitting member is a plane, and the upper surface of the second portion of the light-reflective member is a plane that is located at the same height as the upper surface of the light-transmitting member.

3. The light emitting device according to claim 1 , wherein the upper surface of the light-transmitting member includes a curved surface having a concave curve on a side of the light emitting element in a cross section perpendicular to the first direction.

4. The light emitting device according to claim 3 , wherein the upper surface of the light reflective member in the second portion includes a curved surface that is continuous with a curved surface of the upper surface of the light transmissive member.

5. The upper surface of the light-transmitting member has a first side adjacent to the first portion and a front side adjacent to the second portion. a second side located lower than the first side, and a curved surface having a convex curve toward the light emitting element in a cross section perpendicular to the first direction; The light emitting device according to claim 1 , wherein an upper surface of the light reflective member in the second portion includes a curved surface or a flat surface that is continuous with a curved surface of the upper surface of the light transmissive member.

6. a substrate having an upper surface and a lower surface opposite to the upper surface, the light emitting element and the light reflective member being disposed on the upper surface; The light emitting device according to claim 1 , wherein the substrate has an opening on the lower surface below the second portion, and has a plurality of recesses arranged along a direction perpendicular to the first direction.

7. a plurality of the light emitting elements and a plurality of the light transmissive members; the plurality of light-emitting elements and the plurality of light-transmitting members are arranged in the first direction, the first portion of the light reflective member covers the first side surfaces of the plurality of light emitting elements and the first side surfaces of the plurality of light transmissive members, The light emitting device according to claim 1 , wherein the second portion of the light reflective member covers the second side surfaces of the plurality of light emitting elements and the second side surfaces of the plurality of light transmissive members.

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