JP5286122B2 - Semiconductor light emitting device and method for manufacturing semiconductor light emitting device - Google Patents

Description

  The present invention relates to a semiconductor light emitting device, and more particularly to a so-called side view type semiconductor light emitting device that emits light mainly in a direction substantially parallel to a device mounting surface.

  Backlights used for liquid crystal display devices include an edge light method and a direct type. Generally, an edge light system is adopted for a thin liquid crystal display device mounted on a mobile phone terminal, a notebook personal computer or the like. In the edge light method, light from the light source is incident from the side of the light-transmitting light guide plate, and the entire light guide plate is uniform by changing the light path using the reflective dots provided on the surface of the light guide plate. The backlight of the liquid crystal display device is configured by such surface emission.

  As a light source used for the edge light system, a light emitting diode (LED) is used in the case of a small liquid crystal display device such as a mobile phone in addition to a cold cathode fluorescent lamp (CCLF). As the LED used in the edge light system, a so-called side view type LED having a light emitting surface in a direction substantially perpendicular to the mounting surface of the LED package is used.

  FIG. 1 shows a structure of a conventional side view type semiconductor light emitting device 100. FIG. 1A is a plan view of the semiconductor light emitting device 100 as viewed from the front in the light projecting direction, and FIG. 1B is a plan view of the semiconductor light emitting device as viewed from above. The LED chip 110 is mounted on the base substrate 120. The anode electrode and the cathode electrode on the LED chip 110 are connected to a pad portion (not shown) on the base substrate 120 by a method such as wire bonding, and are drawn out from the electrodes 130 at both ends of the semiconductor light emitting device 100. The front part of the LED chip 110 in the light projecting direction is covered with the light transmissive resin 140. The semiconductor light emitting device 100 is mounted on the mounting substrate 200 by soldering the electrode 130 and a land portion (not shown) on the mounting substrate 200. As described above, in the semiconductor light emitting device shown in FIG. 1, the light emitting surface 300 and the main surface of the LED chip are arranged to face each other. The dimensions of the LED chip are, for example, L = 0.35 mm, W = 0.35 mm, and T = 0.1 mm.

JP 2002-343123 A JP2007-59612A

  With the recent thinning of mobile phone terminals, the thickness of the light guide plate has also decreased. However, if the light guide plate is made thinner, the amount of light from the light source leaking out of the light guide plate increases, resulting in a decrease in the brightness of the liquid crystal display screen. That is, in order to reduce the thickness of the light guide plate, it is also necessary to reduce the thickness of the semiconductor light emitting device serving as a light source. In the conventional side view type semiconductor light emitting device described above, the main surface of the LED chip is configured to face the light emitting surface, and therefore the thickness of the package is limited mainly by the L dimension of the LED chip. It was. For this reason, for example, in the case of using an LED chip with a chip size of about 0.3 mm square, it is difficult to manufacture the package with a thickness of 0.5 mm or less, and it is difficult to cope with further thinning. It was. In addition, since the chip size of a high-power LED chip increases, the package thickness inevitably increases when a high-power LED chip is mounted, achieving both high LED power and a thin package. It was difficult to do.

  The present invention has been made in view of the above-described points, and an object thereof is to provide a side-view type semiconductor light-emitting device that can cope with a reduction in the thickness of a package and a method for manufacturing the same.

  A method of manufacturing a semiconductor light emitting device according to the present invention includes: preparing a base substrate having a device mounting surface, a main surface parallel to the device mounting surface, and at least one die pad on the main surface; A step of flip-chip connecting the semiconductor light emitting device to the substrate, a step of forming a light transmissive resin layer so as to embed a lower portion in the thickness direction including the light emitting layer of the semiconductor light emitting device, And a step of forming a light-reflective resin layer so as to bury an upper portion of the semiconductor light emitting element protruding from the semiconductor light emitting device.

  According to another method of manufacturing a semiconductor light emitting device of the present invention, a step of preparing a first substrate on which a plurality of base substrates each having at least one pad portion are integrally formed, and each of the pad portions is provided. A step of bonding a semiconductor light emitting element; and a second substrate having a plurality of through holes corresponding to the pattern of the first substrate, and the semiconductor light emitting element mounted on the first substrate from each of the through holes Bonding each of the first substrate and the second substrate so as to expose each of the through-holes with a light-transmitting resin so as to cover a lower portion in the thickness direction including the light-emitting layer of the semiconductor light-emitting element. A step of filling and forming a light transmissive resin layer and a third substrate having a plurality of through grooves corresponding to the through holes are prepared, and the surface of the light transmissive resin layer is exposed from each of the through grooves. The second substrate and the A step of bonding the three substrates, and filling each of the through grooves with a light-reflective resin so as to cover an upper portion in the thickness direction of the semiconductor light-emitting element exposed from the surface of the light-transmitting resin layer. The method includes a step of forming a resin layer, and a step of cutting a structure including the first substrate, the second substrate, and the third substrate along a dividing line.

According to another method of manufacturing a semiconductor light emitting device of the present invention, a base substrate having a device mounting surface, a main surface parallel to the device mounting surface, and at least one die pad and bonding pad on the main surface is provided. a step of preparing includes the steps of placing a semiconductor light-emitting element to the die pad, and a step of connecting between the electrode pads and the front Symbol bonding pads on the top surface of the semiconductor light-emitting device by a wire, the said entire semiconductor light emitting element wires Forming a light-transmitting resin layer so as to embed a part of the light-transmitting resin layer, and forming a light-reflective resin layer so as to embed a portion of the wire protruding from the surface of the light-transmitting resin layer; It is characterized by including.

  According to another method of manufacturing a semiconductor light emitting device of the present invention, a step of preparing a first substrate in which a plurality of base substrates each having at least one die pad and a bonding pad are integrally formed; Bonding a semiconductor light emitting element to each other, connecting each electrode pad of the semiconductor light emitting element and each of the bonding pads with a wire, and a plurality of through holes corresponding to the pattern of the first substrate Preparing a second substrate having, and joining the first substrate and the second substrate so that the semiconductor light emitting element and the wire mounted on the first substrate are exposed from each of the through holes; Each of the through holes is filled with a light transmissive resin so as to embed the entire semiconductor light emitting element and a part of the wire to form a light transmissive resin layer. And preparing a third substrate having a plurality of through grooves corresponding to the through holes, and exposing the surface of the light transmissive resin layer from each of the through grooves. A step of bonding the substrate, and a step of forming a light-reflective resin layer by filling each of the through grooves with a light-reflective resin so as to bury the portion of the wire protruding from the surface of the light-transmitting resin layer And cutting the structure including the first substrate, the second substrate, and the third substrate along a dividing line.

  The semiconductor light-emitting device of the present invention is a semiconductor light-emitting device that mainly emits light in a direction substantially parallel to the device mounting surface, and has a base substrate having at least one pad portion on the main surface parallel to the device mounting surface. A light-transmitting resin layer that is provided on the base substrate and covers a lower portion in the thickness direction including the light-emitting layer of the semiconductor light-emitting element, and the light-transmitting resin layer. A light-reflective resin layer that is provided on the conductive resin layer and covers an upper portion in the thickness direction of the semiconductor light-emitting element protruding from the surface of the light-transmitting resin layer.

  Another semiconductor light-emitting device of the present invention is a semiconductor light-emitting device that mainly emits light in a direction substantially parallel to the device mounting surface. At least one die pad and bonding pad are provided on the main surface parallel to the mounting surface. A base substrate having the semiconductor light emitting element bonded to the die pad, a wire wiring connecting the electrode pad on the upper surface of the semiconductor light emitting element and the bonding pad, and provided on the base substrate, A light-transmitting resin layer that embeds the entire semiconductor light emitting element and part of the wire wiring, and the wire wiring that is provided on the light-transmitting resin layer and protrudes from the surface of the light-transmitting resin layer And a light-reflective resin layer.

  Another semiconductor light-emitting device of the present invention is a semiconductor light-emitting device that emits light in a direction substantially parallel to the surface of the conductive substrate, and the semiconductor light-emitting device mounted on the conductive substrate and the conductive substrate. An element, a spacer member fixed on the conductive substrate and disposed so as to surround the periphery of the semiconductor light emitting element excluding the light emission direction, a bonding pad formed on the upper surface of the spacer member, and the semiconductor light emitting element A wire connecting between the electrode pad on the upper surface and the bonding pad; a light-transmitting resin layer covering the semiconductor light-emitting element; and a light covering above the semiconductor light-emitting element, the light-transmitting resin layer, and the spacer member And a part of the wire is embedded in the light-reflective resin layer.

  According to the semiconductor light emitting device element of the present invention, it is possible to cope with further thinning of the package.

FIG. 1A is a plan view of a conventional side-view type semiconductor light emitting device as viewed from the front in the light projecting direction, and FIG. 1B is a plan view of the conventional side view semiconductor light emitting device as viewed from above the mounting substrate on which the semiconductor light emitting device is mounted. 2A is a top view of the semiconductor light emitting device according to the first embodiment of the present invention, and FIG. 2B is a cross-sectional view taken along line 2b-2b in FIG. 2A. 3A to 3D are top views for each manufacturing process of the semiconductor light emitting device according to the embodiment of the present invention. 4E to 4G are top views for each manufacturing process of the semiconductor light emitting device according to the embodiment of the present invention. 5A is a top view of a first resin substrate including a plurality of base substrates 20, FIG. 5B is a top view of a second resin substrate including a plurality of spacer members, and FIG. 5C. FIG. 6 is a top view of a third resin substrate including a plurality of frame members 35. 6A is a top view of the semiconductor light emitting device according to the second embodiment of the present invention, and FIG. 6B is a cross-sectional view taken along line 6b-6b in FIG. 6A. FIG. 7A is a top view of a semiconductor light emitting device according to the third embodiment of the present invention, and FIG. 7B is a cross-sectional view taken along line 7b-7b in FIG. 7A. FIG. 8A is a top view of a semiconductor light emitting device according to the fourth embodiment of the present invention, and FIG. 8B is a cross-sectional view taken along line 8b-8b in FIG.

  Embodiments of the present invention will be described below with reference to the drawings. 2A is a top view of the semiconductor light emitting device 1 according to the first embodiment of the present invention, and FIG. 2B is a cross-sectional view taken along line 2b-2b in FIG. 2A. In FIG. 2A, the structures of the light transmitting resin 50 and the light reflecting resin 60 are not shown in order to clarify the structure viewed from above the semiconductor light emitting device 1.

  The semiconductor light emitting device 1 according to the present embodiment mainly includes an LED chip 10 as a light emitting element, a base substrate 20 on which the LED chip 10 is mounted, and light that covers the LED chip 10 and seals the LED chip 10 and the like. The reflective resin 60, the frame member 40 that defines the formation region of the light reflective resin 60, the spacer member 30 for forming a space between the base substrate 20 and the light reflective resin 60, and the space are filled. And the light transmissive resin 50. The semiconductor light emitting device 1 has a light emitting surface 80 in a plane that intersects with a device mounting surface 70 that forms a bonding surface with a mounting substrate (not shown), and an end surface that intersects the main surface of the LED chip 10 has a light emitting surface 80. It is a so-called side-view type semiconductor light emitting device that faces each other. Here, the main surface of the LED chip refers to a growth surface of a semiconductor layer constituting the LED chip.

  The LED chip 10 as a light emitting element is a blue LED made of, for example, a GaN-based semiconductor and has a laminated structure of semiconductor films made of an n layer, a light emitting layer, and a p layer (all not shown). An anode electrode and a cathode electrode (not shown) are formed on the upper surface of the LED chip. The chip size of the LED chip 10 is, for example, 0.3 mm × 0.3 mm, and the thickness is, for example, 0.1 mm. The LED chip 10 is bonded onto a die pad 21 formed on the base substrate 20 using soldering or an adhesive.

  The base substrate 20 has a conductor pattern made of Cu foil or the like on the surface of a glass epoxy resin base material having a thickness of about 50 μm, for example. With such a conductor pattern, a die pad 21 is provided at the center of the base substrate 20, and bonding pads 22 are provided on both sides of the die pad 21. The anode electrode and the cathode electrode on the upper surface of the LED chip 10 are electrically connected to the bonding pad 22 through the bonding wire 11. The back surface of the base substrate 20 is a device mounting surface for mounting on the mounting substrate. On the device mounting surface 70, a back surface wiring 23 electrically connected to each bonding pad 22 through a through hole (not shown) is formed. The back surface wiring 23 constitutes a joint for mounting the semiconductor light emitting device 1 on the mounting substrate.

  A spacer member 30 for forming a space between the base substrate 20 and the light reflective resin 60 is provided on the base substrate 20. As shown in FIG. 2A, the spacer member 30 has a substantially semicircular cutout 31 in a top view. The spacer member 30 is provided so that the LED chip 10 is located at the center of the notch 31. The notch 31 forms an opening in front of the light projecting direction, and defines the width and height of the light emitting area on the light emitting surface 80. The spacer member 30 can use a glass epoxy resin having a plate thickness of about 50 μm as a base material. For example, a commercially available adhesive sheet can be used for joining the spacer member 30 and the base substrate 20. A light reflecting member such as a metal film may be provided on the inner wall of the spacer member 30 that defines the outer edge of the notch 31. Further, a light reflective material such as alumina may be used as the base material of the spacer member 30.

  A space on the base substrate 20 formed by the spacer member 30 is filled with a light transmissive resin 50 made of, for example, a silicone resin, and a part of the LED chip 10 and the bonding wire 11 is made of the light transmissive resin 50. Buried inside. The light transmissive resin 50 is filled with a thickness such that the upper surface thereof is substantially the same as the height position of the upper surface of the spacer member 30. At this time, as shown in FIG. 2B, the loop top portion of the bonding wire 11 protrudes from the upper surface of the light transmissive resin 50. The loop height of the bonding wire is about 100 μm.

  A phosphor is dispersed in the light transmissive resin 50. As the phosphor, for example, a YAG: Ce phosphor obtained by introducing Ce (cerium) as an activator into YAG can be used. The phosphor absorbs blue light having a peak wavelength of about 460 nm emitted from the LED chip 10 and converts it into yellow light having an emission peak around 560 nm. Thereby, white light can be obtained from the light emitting surface 80 by mixing yellow light emitted from the phosphor and blue light transmitted through the light-transmitting resin 50 without wavelength conversion. The light transmissive resin 50 may further contain a light scattering material. Further, as shown in FIG. 2B, the light transmissive resin 50 can be formed so that its upper surface has a convex shape, thereby improving the light extraction efficiency.

  A pair of frame members 40 are provided on the spacer member 30 so as to face each other along the side end surface of the semiconductor light emitting device 1. For the frame member 40, for example, a glass epoxy resin having a plate thickness of about 150 μm can be used, and a commercially available adhesive sheet can be used for joining to the spacer member 30. A light reflective resin 60 is injected into a space between a pair of frame members 40 provided so as to face each other. The loop top portion of the bonding wire 11 protruding from the upper surface of the light transmissive resin 50 is embedded in the light reflective resin 60. The light reflective resin 60 functions as a sealing material and prevents light from leaking from surfaces other than the light emitting surface 80. For example, a light transmissive resin made of a silicone resin or the like containing titanium oxide powder can be used as the light reflective resin 60. As described above, it is possible to improve the light extraction efficiency by surrounding the LED chip 10 with the high reflectance member. In addition, it is preferable that resin used as the raw material of the sealing agent 60 has the same main component as the light-transmitting resin 50 in the lower layer. By making the main components common, the physical properties such as the thermal shrinkage rate of the light-transmitting resin 50 and the light-reflecting resin 60 are close, and the stress applied to the bonding wire 11 embedded between these two layers is reduced. It is possible to improve reliability. As described above, the semiconductor light emitting device 1 of the present embodiment has a configuration in which the end surface (side end surface) intersecting the main surface is opposed to the light emitting surface 80 instead of the main surface of the LED chip 10, and the bonding wire 11 is looped. Is covered with two resin layers of the light-transmitting resin 50 and the light-reflecting resin 60, so that the package can be thinned regardless of the chip size of the LED chip 10. That is, it is possible to simultaneously achieve a thin package and high output. According to the configuration of the semiconductor light emitting device of this embodiment, the thickness of the package can be reduced to 0.3 mm or less, and the thickness can be significantly reduced as compared with the conventional structure.

  Next, a method for manufacturing the semiconductor light emitting device 1 according to this example will be described with reference to FIGS. 3A to 3D and FIGS. 4E to 4G are top views in each manufacturing process of the semiconductor light emitting device 1. 5A to 5C show a first resin substrate 25 including a plurality of base substrates 20 and a second resin substrate 35 including a plurality of spacer members 30, respectively, used for manufacturing the semiconductor light emitting device 1. 4 is a top view of a third resin substrate 45 including a plurality of frame members 40. FIG. In this embodiment, a plurality of semiconductor layered body light emitting devices are manufactured at once using the resin substrates 25, 35 and 45. In FIGS. 3 and 4, four out of a plurality of semiconductor light emitting devices manufactured in a batch are shown.

  First, the first resin substrate 25 is prepared. A plurality of pieces of the base substrate 20 are arranged in the vertical and horizontal directions on the first resin substrate 25, and these are integrally formed (FIGS. 3A and 5A). Each piece of the base substrate 20 in the first resin substrate 25 is provided with a die pad 21 at the center, and has bonding pads 22 on both sides of the die pad 21. The bonding pad 22 is electrically connected to the back surface wiring 23 through the through hole 24. In FIG. 5A, the configurations of the die pad 21 and the bonding pad 22 are omitted, and the boundary between the pieces of the base substrate 20 adjacent to each other is indicated by a broken line.

  Next, after applying an adhesive on the die pad 21 of each base substrate 20 by a dispensing method, the LED 10 chip is mounted and the adhesive is cured. Next, the anode electrode and the cathode electrode provided on the surface of the LED chip 10 and the bonding pad 22 are connected by the bonding wire 11 (FIG. 3B). When a back electrode type LED chip in which the back surface of the LED chip 10 is an anode electrode or a cathode electrode is used, the base substrate 20 is configured so that power can be supplied to the LED chip 10 through the back surface wiring 23 and the die pad 21. The conductor pattern is appropriately modified. In this case, the LED chip 10 and the base substrate 20 are bonded using a conductive bonding material such as Ag paste or solder, and the number of bonding wires is one.

  Next, a second resin substrate 35 is prepared. As shown in FIG. 5B, the plurality of spacer members 30 are arranged in the vertical and horizontal directions on the second resin substrate 35, and these are integrally formed. The second resin substrate 35 is formed with a plurality of through holes 31 a that constitute the notches 31 of the spacer member 30. In FIG.5 (b), the boundary of the piece of the spacer member 30 adjacent to each other is shown with the broken line.

  Then, the first resin substrate 25 on which the LED chip 10 is mounted and the second resin substrate 35 are bonded together using an adhesive sheet or the like. The formation region of the through hole 31a formed in the second resin substrate 35 corresponds to the formation region of the conductor pattern on the first resin substrate 25, and the second resin substrate 35 is the first resin substrate. Two adjacent LED chips 10 and bonding wires 11 mounted on 25 are bonded to the first resin substrate 25 so as to be exposed from the respective through holes 31a (FIG. 3C).

  Next, a light-transmitting resin 50 made of silicone resin or the like is filled so as to embed the entire LED chip 10 and a part of the bonding wire 11 inside the through hole 31a by a dispensing method or the like. The light transmissive resin 50 is applied so that the upper surface thereof is substantially at the same position as the height of the upper surface of the spacer member 30. At this time, the loop top of the bonding wire 11 protrudes from the upper surface of the light transmissive resin 50. Will be. In addition, by making the coating thickness of the light-transmitting resin 50 on the upper part of the LED chip 10 slightly thicker than the other parts and making it convex, the area of the light emitting surface near the optical axis is expanded, and the light extraction efficiency is increased. It improves (FIG.3 (d)).

  Next, as shown in FIG. 5C, a third resin substrate 45 having a thickness of about 150 μm including a set of a plurality of frame members 40 is prepared. In the third resin substrate 45, a plurality of through grooves 41 that define the separation distance between the pair of frame members 40 are formed. In FIG.5 (c), the boundary of the group of the frame members 40 which mutually adjoin is shown with the broken line. Next, the second resin substrate 35 and the third resin substrate 45 are bonded together using an adhesive sheet or the like. The formation region of the through groove 41 formed in the third resin substrate 45 corresponds to the formation region of the through hole 31 a of the second resin substrate 25, and the third resin substrate 45 is located in the through groove 41. Each of the through holes 31a filled with the light transmissive resin 50 is joined so as to be completely exposed. As a result, a pair of frame members 40 are provided at positions corresponding to both end portions of the semiconductor light emitting device 1, and a concave space is formed with the surfaces of the spacer member 30 and the light transmissive resin 50 as bottom surfaces (FIG. 4 ( e)).

  Next, the concave space formed between the pair of frame members 40 is filled with a light reflective resin 60 in which a titanium resin powder is contained in a silicone resin by a dispensing method or the like. The light-reflecting resin 60 is applied so that the upper surface thereof is substantially at the same position as the height of the upper surface of the frame member 40. At this time, the loop top portion of the bonding wire 11 protruding from the surface of the light-transmitting resin 50 is Then, it is embedded in the light reflective resin 60 (FIG. 4F).

  Next, after the light-reflecting resin 60 is cured, the semiconductor light-emitting device 1 is separated into pieces by dicing the structure that has undergone the above-described steps (FIG. 4G). The semiconductor light emitting device 1 is completed through the above steps.

  As described above, according to the manufacturing method of the present embodiment, in the configuration in which the end surface intersecting the main surface of the LED chip 10 is opposed to the light emitting surface, the loop of the bonding wire 11 is connected to the light transmitting resin 50 and the light reflecting resin. Since the two resin layers 60 are sequentially covered, the thickness of the spacer member 30 can be reduced regardless of the wire loop height, and the semiconductor light emitting device can be made thinner.

  FIG. 6A is a top view of the semiconductor light emitting device 2 according to the second embodiment of the present invention, and FIG. 6B is a cross-sectional view taken along line 6b-6b of FIG. 6A. In the semiconductor light emitting device 2, wire bonding is performed not on the base substrate but on the spacer member 30. The spacer member 30 is made of glass epoxy resin or the like having a plate thickness of about 50 μm, and a bonding pad 32 made of copper foil or the like is formed on the surface. The bonding wire 11 is connected to the bonding pad 32 of the spacer member 30. The bonding pad 32 is electrically connected to the conductor wiring on the base substrate 20 through a through hole (not shown) provided in the spacer member 30. FIGS. 6A and 6B are examples in the case of using an LED chip of the type in which the back surface of the LED chip 10 is an anode electrode or a cathode electrode. The LED chip 10 is made of Ag paste, solder, or the like. Bonding to the bonding pad 21 is performed using a conductive bonding material. The bonding pad 21 is connected to the back surface wiring 23 through a through hole (not shown), and there is one bonding wire.

  A spacer member 30 for forming a space between the base substrate 20 and the light reflective resin 60 is provided on the base substrate 20. The spacer member 30 has a rectangular cutout 31 in a top view, and is provided so that the LED chip 10 is positioned at the center of the cutout 31. A space on the base substrate 20 formed by the spacer member 30 is filled with a light transmissive resin 50 made of, for example, a silicone resin, and a part of the LED chip 10 and the bonding wire 11 is made of the light transmissive resin 50. Buried inside. The light-transmitting resin 50 is formed with a thickness so that the upper surface thereof is substantially the same as the height of the upper surface of the spacer member 30, and as shown in FIG. 50 protrudes from the upper surface.

  A pair of frame members 40 are provided on the spacer member 30 so as to face each other along the side end surface of the semiconductor light emitting device 2. For the frame member 40, for example, a glass epoxy resin having a plate thickness of about 150 μm can be used, and a commercially available adhesive sheet can be used for joining to the spacer member 30. A light reflective resin 60 is injected into a space between a pair of frame members 40 provided so as to face each other. At this time, the loop top portion of the bonding wire 11 protruding from the light transmissive resin 50 is embedded in the light reflective resin 60.

  As described above, the semiconductor light emitting device 2 according to the second example has a structure in which the bonding wire 11 is embedded in the two resin layers of the light transmitting resin 50 and the light reflecting resin 60 as in the first example. Regardless of the loop height of the bonding wire 11, the thickness of the spacer member 30 can be reduced, and the semiconductor light emitting device can be reduced in thickness. Further, since the bonding pad 32 is provided on the spacer member 30, the width of the light emitting surface defined by the notch 31 of the spacer member 30 is made narrower than that in the case of the first embodiment. For example, it is possible to efficiently introduce light into a rod-shaped light guide plate having a small area of the light introduction surface.

  FIG. 7A is a top view of the semiconductor light emitting device 3 according to the third embodiment of the present invention, and FIG. 7B is a sectional view taken along line 7b-7b in FIG. 7A. In the semiconductor light emitting device 3, the base substrate 20 is excluded, LED chips are directly mounted on the copper foil, and wire bonding is performed on the spacer member 30. The spacer member 30 is made of glass epoxy resin or the like having a plate thickness of about 100 μm, which is about the same as the thickness of the LED chip 10, and has a rectangular cutout 31 in a top view. The bonding pad 32 provided on the surface of the spacer member 30 is electrically connected to the back surface wiring 34 through a through hole (not shown). A back surface wiring 33 is provided on the back surface of the spacer member 30 so as to straddle the notch 31. The back surface wirings 33 and 34 that are electrically separated from each other are made of, for example, a copper foil having a film thickness of about 50 μm, and the LED chip 10 is directly on the copper foil constituting the back surface wiring 34 at the center of the notch 31. Installed. The back surface of the LED chip 10 is a cathode electrode (or an anode electrode), and the LED chip 10 is bonded onto the back surface wiring 34 using a conductive Ag paste, solder, or the like. Thereafter, the anode electrode (or cathode electrode) on the surface side of the LED chip 10 is connected to the bonding pad 32 through the bonding wire 11.

  The space on the back surface wiring 34 formed by the spacer member 30 is filled with a light transmissive resin 50 made of, for example, a silicone resin, and a part of the LED chip 10 and the bonding wire 11 is made of the light transmissive resin 50. Buried inside. The light-transmitting resin 50 is formed with a thickness so that the upper surface thereof is substantially the same as the height of the upper surface of the spacer member 30, and as shown in FIG. 50 protrudes from the upper surface.

  A pair of frame members 40 are provided on the spacer member 30 so as to face each other along the side end surface of the semiconductor light emitting device 3. For the frame member 40, for example, a glass epoxy resin having a plate thickness of about 150 μm can be used, and a commercially available adhesive sheet can be used for joining to the spacer member 30. A light reflective resin 60 is injected into a space between a pair of frame members 40 provided so as to face each other. At this time, the loop top portion of the bonding wire 11 protruding from the light transmissive resin 50 is embedded in the light reflective resin 60.

  Thus, in the semiconductor light emitting device 3 according to the third example, the base substrate for mounting the LED chip 10 is eliminated, and the LED chip is directly mounted on the copper foil constituting the back surface wiring. It is possible to further reduce the thickness of the light emitting device. Further, since the bonding pad 32 is provided on the spacer member 30 as in the second embodiment, the width of the light emitting surface defined by the notch 31 is larger than that in the first embodiment. For example, it is possible to efficiently introduce light into a rod-shaped light guide plate having a small area of the light introduction surface.

  FIG. 8A is a top view of the semiconductor light emitting device 4 according to the fourth embodiment of the present invention, and FIG. 8B is a sectional view taken along 8b-8b of FIG. 8A. In the semiconductor light emitting device 4 of the fourth embodiment, the LED chip is made into a flip chip structure to eliminate the bonding wire, and the LED chip 10 is embedded in two layers of the light transmitting resin 50 and the light reflecting resin 60. Yes.

  The anode electrode and the cathode electrode provided on the device mounting surface side of the LED chip 10 are connected to the pair of pad portions 24 on the base substrate 20 via the AuSn solder balls 12. Each part of the pad portion 24 is electrically separated from each other and connected to the back surface wiring 23 through a through hole (not shown).

  A spacer member 30 for forming a space between the base substrate 20 and the light reflective resin 60 is provided on the base substrate 20. The spacer member 30 has a substantially semicircular cutout 31 in a top view. The spacer member 30 is provided so that the LED chip 10 is located at the center of the notch 31. As a base material of the spacer member 30, a glass epoxy resin having a plate thickness of about 50 μm can be used. For joining the spacer member 30 and the base substrate 20, for example, a commercially available adhesive sheet can be used.

  A space on the base substrate 20 formed by the spacer member 30 is filled with a light transmitting resin 50 made of, for example, a silicone resin. The light transmissive resin 50 is filled with a thickness such that the upper surface thereof is substantially the same as the height position of the upper surface of the spacer member 30. At this time, the lower part including the light emitting layer of the LED chip 10 is embedded in the light transmissive resin 50, but the upper part is exposed from the upper surface of the light transmissive resin 50. That is, the spacer member 30 is thinner than the entire LED chip including the AuSn solder ball 12.

  A pair of frame members 40 are provided on the spacer member 30 so as to face each other along the side end surface of the semiconductor light emitting device 1. For the frame member 40, for example, a glass epoxy resin having a plate thickness of about 150 μm can be used, and a commercially available adhesive sheet can be used for joining to the spacer member 30. A light reflective resin 60 is injected into a space between a pair of frame members 40 provided so as to face each other. At this time, the upper part of the LED chip 10 exposed from the light transmissive resin 50 is embedded in the light reflective resin 60.

  As described above, in the semiconductor device 4 according to the fourth embodiment, the LED chip 10 has the flip chip structure to eliminate the bonding wire, and the LED chip 10 is placed in the two layers of the light transmitting resin 50 and the light reflecting resin 60. Therefore, the spacer member 30 can be reduced in thickness, and the semiconductor light emitting device can be reduced in thickness.

DESCRIPTION OF SYMBOLS 10 LED chip 11 Bonding wire 20 Base substrate 21 Die pad 22 Bonding pad 30 Spacer member 31 Notch 40 Frame member 50 Light transmitting resin 60 Light reflecting resin 70 Device mounting surface 80 Light emitting surface

Claims (14)

Preparing a base substrate having a device mounting surface, a main surface parallel to the device mounting surface, and at least one die pad on the main surface;
Flip chip connecting a semiconductor light emitting element to the die pad;
Forming a light transmissive resin layer so as to embed a lower portion in the thickness direction including the light emitting layer of the semiconductor light emitting element;
Forming a light-reflective resin layer so as to bury an upper portion of the semiconductor light-emitting element protruding from the surface of the light-transmitting resin layer. Providing a first substrate integrally formed with a plurality of base substrates each having at least one pad portion;
Bonding a semiconductor light emitting element to each of the pad portions;
A second substrate having a plurality of through holes corresponding to the pattern of the first substrate is prepared, and the first light emitting device mounted on the first substrate is exposed from each of the through holes. And bonding the second substrate;
Filling each of the through holes with a light-transmitting resin so as to cover a lower portion in the thickness direction including the light-emitting layer of the semiconductor light-emitting element, and forming a light-transmitting resin layer;
A third substrate having a plurality of through grooves corresponding to the through holes is prepared, and the second substrate and the third substrate are formed so that the surface of the light transmissive resin layer is exposed from each of the through grooves. Joining, and
Filling each of the through grooves with a light-reflective resin so as to cover an upper portion in the thickness direction of the semiconductor light-emitting element exposed from the surface of the light-transmitting resin layer, and forming a light-reflective resin layer;
Cutting the structure including the first substrate, the second substrate, and the third substrate along a dividing line, and a method for manufacturing a semiconductor light emitting device. A semiconductor light emitting device that emits light in a direction substantially parallel to the device mounting surface,
A base substrate having at least one pad portion on a main surface parallel to the device mounting surface;
The semiconductor light emitting device bonded to the pad portion;
A light transmissive resin layer provided on the base substrate and covering a lower portion in the thickness direction including the light emitting layer of the semiconductor light emitting element;
A light-reflecting resin layer provided on the light-transmitting resin layer and covering an upper portion in the thickness direction of the semiconductor light-emitting element protruding from the surface of the light-transmitting resin layer. Semiconductor light emitting device.   2. The method of manufacturing a semiconductor light emitting device according to claim 1, further comprising a step of disposing a spacer member on the base substrate so as to surround the periphery of the semiconductor light emitting element excluding the light emission direction of the semiconductor light emitting device. Method. Preparing a base substrate having a device mounting surface, a main surface parallel to the device mounting surface, and at least one die pad and bonding pad on the main surface;
Arranging a semiconductor light emitting element on the die pad;
A step of connecting a wire between the electrode pad and the previous SL bonding pads on the top surface of the semiconductor light emitting element,
Forming a light transmissive resin layer so as to embed a part of the entire semiconductor light emitting element and the wire;
Forming a light-reflective resin layer so as to embed the portion of the wire protruding from the surface of the light-transmissive resin layer. Providing a first substrate integrally formed with a plurality of base substrates each having at least one die pad and bonding pad;
Bonding a semiconductor light emitting element to each of the die pads;
Connecting each electrode pad of the semiconductor light emitting element and each of the bonding pads with a wire;
A second substrate having a plurality of through holes corresponding to the pattern of the first substrate is prepared, and the semiconductor light emitting device and the wire mounted on the first substrate are exposed from each of the through holes. Bonding the first substrate and the second substrate;
Filling each of the through-holes with a light-transmitting resin so as to embed the entire semiconductor light-emitting element and a part of the wire, and forming a light-transmitting resin layer;
A third substrate having a plurality of through grooves corresponding to the through holes is prepared, and the second substrate and the third substrate are formed so that the surface of the light transmissive resin layer is exposed from each of the through grooves. Joining, and
Filling each of the through grooves with a light-reflective resin so as to embed the portion of the wire protruding from the surface of the light-transmitting resin layer, and forming a light-reflective resin layer;
Cutting the structure including the first substrate, the second substrate, and the third substrate along a dividing line, and a method for manufacturing a semiconductor light emitting device. A semiconductor light emitting device that emits light in a direction substantially parallel to the device mounting surface,
A base substrate having at least one die pad and bonding pad on a main surface parallel to the mounting surface;
The semiconductor light emitting device bonded to the die pad;
Wire wiring connecting between the electrode pad on the upper surface of the semiconductor light emitting element and the bonding pad;
A light-transmitting resin layer that is provided on the base substrate and embeds the entire semiconductor light emitting element and a part of the wire wiring;
And a light-reflective resin layer provided on the light-transmitting resin layer and embedding the wire wiring protruding from the surface of the light-transmitting resin layer.   6. The method of manufacturing a semiconductor light emitting device according to claim 5, further comprising a step of disposing a spacer member on the base substrate so as to surround the periphery of the semiconductor light emitting element excluding the light emission direction of the semiconductor light emitting device. Method.   A bonding pad is provided on the upper surface of the spacer member, and instead of the step of connecting the electrode pad on the upper surface of the semiconductor light emitting device and the bonding pad with a wire, the electrode pad on the upper surface of the semiconductor light emitting device and the spacer member The method of manufacturing a semiconductor light emitting device according to claim 8, further comprising a step of connecting the bonding pad on the upper surface with a wire.   7. The semiconductor light emitting device according to claim 1, wherein the resin material constituting the light transmissive resin layer and the light reflective resin layer has a common main component. Device manufacturing method.   The method of manufacturing a semiconductor light emitting device according to claim 1, wherein the light reflective resin layer contains titanium oxide.   The method for manufacturing a semiconductor light-emitting device according to claim 1, wherein the light-transmitting resin layer includes a phosphor.   8. The semiconductor light emitting device according to claim 3, further comprising a step of arranging a spacer member on the base substrate so as to surround the periphery of the semiconductor light emitting element excluding the light emission direction of the semiconductor light emitting device. . A conductive substrate;
A semiconductor light emitting device mounted on the conductive substrate;
A spacer member fixed on the conductive substrate and disposed so as to surround the periphery of the semiconductor light emitting element excluding the light emission direction;
A bonding pad formed on the upper surface of the spacer member;
A wire connecting the electrode pad on the upper surface of the semiconductor light emitting element and the bonding pad;
A light transmissive resin layer covering the semiconductor light emitting element;
A light-reflective resin layer covering the semiconductor light-emitting element, the light-transmitting resin layer, and the spacer member;
A part of the wire is embedded in the light-reflective resin layer, and the semiconductor light-emitting device emits light in a direction substantially parallel to the surface of the conductive substrate.

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