Source: https://patents.google.com/patent/TWI462343B/en
Timestamp: 2019-12-11 03:11:36
Document Index: 369368729

Matched Legal Cases: ['Application No. 10', 'art\n11', 'art\n11', 'art\n67', 'art\n68', 'art\n1022', 'art\n1031']

TWI462343B - Light emitting device - Google Patents
TWI462343B
TWI462343B TW100128370A TW100128370A TWI462343B TW I462343 B TWI462343 B TW I462343B TW 100128370 A TW100128370 A TW 100128370A TW 100128370 A TW100128370 A TW 100128370A TW I462343 B TWI462343 B TW I462343B
TW100128370A
TW201212296A (en
2010-08-09 Priority to KR1020100076419A priority Critical patent/KR101114197B1/en
2011-08-09 Application filed by Lg Innotek Co Ltd filed Critical Lg Innotek Co Ltd
2012-03-16 Publication of TW201212296A publication Critical patent/TW201212296A/en
2014-11-21 Publication of TWI462343B publication Critical patent/TWI462343B/en
The present invention claims priority to Korean Patent Application No. 10-2010-00764, filed on Aug. 09, 2010, which is hereby incorporated by reference.
The present invention relates to a light emitting device and an illumination system therewith.
A light-emitting diode (LED) is a semiconductor light-emitting device that converts electrical energy into light. Compared to conventional light source devices such as a phosphor lamp and an incandescent bulb, LEDs have advantages at many levels, such as low power consumption, semi-permanent life cycle, and fast Reaction time, safety, environmental protection, etc. Therefore, in order to make it possible to replace the conventional light source device, many studies have been conducted. In addition, LEDs are increasingly being used more and more as light sources for various lamps used in indoor and outdoor applications, such as liquid crystal display devices, scoreboards, and street lamps.
Embodiments of the present invention relate to a novel light emitting device and an illumination system therewith.
Embodiments of the present invention provide a light emitting device including: an insulation film to support a plurality of metal layers; and a light emitting chip electrically connected to the metal layers.
Embodiments of the present invention provide a light emitting device and an illumination system including the same, wherein the light emitting device has a chamber structure in which an inner portion of one of the metal layers is deeper than an outer portion thereof.
Embodiments of the present invention provide a light emitting device and an illumination system including the same, the light emitting device comprising: a guide member around a light emitting wafer; and a resin layer therein.
In one embodiment, a light emitting device includes: a plurality of metal layers are spaced apart from each other; a first insulating film is disposed on an outer portion of one of the top surface regions of the metal layers, and has an open region ( Open area), a portion of the top surface of the metal layer is opened in the region; an illuminating wafer is disposed on at least one of the metal layers and electrically connected to the other metal layer; and a resin The layer is disposed on the metal layer and the luminescent wafer, wherein the metal layers comprise an inner portion and an outer portion, and the outer portion has a thickness greater than a thickness of the inner portion.
One or more embodiments of the invention are described in detail in the following figures and description. Other features can be found in the drawings and description of the invention, as well as in the scope of the claims.
In the description of the embodiments, it is to be understood that when a layer (or film), a region, a pattern, or a structure is referred to as another layer (or film), a region, an electrode pad, or a pattern The terms "up/down" and "above/below" are used to mean "directly" and "indirectly". Further, the positions of "up/down" and "upper/lower" of each layer will be described with reference to the drawings.
In the drawings, the thickness and size of the various layers may be exaggerated, omitted, or simply drawn for clarity and convenience. In addition, in the drawings, the size of the constituent elements may also be exaggerated, omitted, or only roughly illustrated for clarity and convenience.
1 is a cross-sectional view of a light emitting device according to a first embodiment.
Referring to FIG. 1, the illuminating device comprises: a plurality of metal layers 11, 13; insulating films 21, 23 on the metal layers 11, 13, an illuminating wafer 41 on the metal layer 11 between the metal layers 11, 13; A guiding member 31 is disposed on the insulating film 21; and a resin layer 61 is disposed on the metal layers 11, 13 to cover the light emitting wafer 41.
The metal layers 11, 13 are disposed apart from each other via a separation portion 17, and the separation portion 17 may be an empty area or may be formed of an insulating adhesive material. The separation portion 17 substantially separates the metal layers 11, 13 from electrical short circuits between the metal layers 11, 13.
The metal layers 11, 13 do not additionally use a body, for example, a structure in which a metal layer is fixed to a body formed of a resin series such as polyphthalamide (PPA), so that the metal layers 11 and 13 are partially formed. It may have a curved shape, may be bent at a predetermined angle, or may be partially etched.
The metal layers 11, 13 may have different thicknesses depending on a region, respectively. The thickness of the partial region B2 in one of the metal layers 11, 13 may be smaller than an outer partial region B1. A region B3 between the partial region B2 and the outer partial region B1 within the metal layers 11, 13 is a slant area, so that an inclined plane with respect to at least two surfaces of the light-emitting wafer 41 can be provided.
The inner portion 11-1 of the first metal layer 11 and the inner portion 13-1 of the second metal layer 13 are disposed on the inner portion corresponding to the light emitting wafer 41 as compared with the outer portions 11-2, 13-2. part. The thickness T5 of the outer portions 11-2, 13-2 in the metal layers 11, 13 is greater than the thickness T4 of the inner portions 11-1, 13-1 of the metal layers 11, 13. The thickness T4 of the inner portions 11-1, 13-1 in the metal layers 11, 13 may fall within the range of about 15 μm to about 300 μm. A preferred range for this thickness is from about 15 μm to about 50 μm. In addition, the thickness can be used as a supporting frame for supporting the entire illuminating device, and can be used as a heat radiation member for conducting heat generated by the illuminating wafer 41.
The inner portion B2 of the metal layers 11, 13 may be formed by partially etching the thickness of the metal layers 11, 13. In the partial etching process, one inclined region B3 having an inclined plane may be formed between the partial region B2 and the outer partial region B1 within the metal layers 11, 13. If viewed from a top view, the metal layers 11, 13 may have a polygonal shape, and the inner partial region B2 may have a cavity C1 or a recess structure having a predetermined depth, and an outer portion B1 is different.
The outer portion 11-2 of the first metal layer 11 is disposed around the inner portion 11-1, and the outer portion 13-2 of the second metal layer 13 is disposed around the inner portion 13-1. The outer portions 11-2, 13-2 of the first and second metal layers 11, 13 are disposed around the inner portions 11-1, 13-1. The inner partial region B2 may have a chamber or a recess.
The inclined regions B3 of the metal layers 11, 13 have surfaces opposite to each other. From the top faces of the inner portions 11-1, 13-1 of the metal layers 11, 13, one of the inclined regions B3 has an inclination angle of about 15 to about 89. The inclined plane of the inclined region B3 is a reflecting plane and tends to the surface of the light-emitting chip 41, thereby effectively reflecting light.
The metal layers 11, 13 may be made of Fe, Cu, an alloy containing Fe such as Fe-Ni, Al, an alloy containing Al, or an alloy containing Cu such as Cu-Ni and Cu-Mg-Sn. Formed. The metal layers 11, 13 may be formed of a single layer or a plurality of layers of metal. A reflective layer or a bonding layer formed of Al, Ag, or Au may be formed on the top and/or lower surfaces of the metal layers 11, 13.
If the metal layers 11, 13 are realized by a lead frame, the mechanical strength is strong, the thermal expansion coefficient is large, and the process ability is excellent. There is almost no loss when repeating a bending operation, and plating or soldering can be easily performed.
The first insulating film 21 may be formed on the portions 11-2, 13-2 outside the metal layers 11, 13, and a conductive member may be formed on the first insulating film 21. The first insulating film 21 may be formed to have the same width as the outer portions 11-2, 13-2, that is, the outer partial region B5. The first insulating film 21 may have a frame shape, a ring shape, or a loop shape so that it can be along the outer portions 11-2, 13-2 of the metal layers 11, 13. The top surface is glued. Here, the first insulating film 21 may be adhered by an adhesive layer or directly adhered.
The lower surface of the first insulating film 21 can be disposed at a position higher than the light-emitting wafer 41, so that it can be disposed to surround the light-emitting wafer 41.
The light-emitting wafer 41 and the second insulating film 23 may be formed on the inner portion B2 of the metal layers 11, 13. The second insulating film 23 may correspond to a separation portion 17 between the metal layers 11, 13, and may be disposed on the top surface and/or the lower surface of the metal layers 11, 13. The lower surface of the second insulating film 23 may be disposed on the same line as the lower surface of the light-emitting wafer 41.
The second insulating film 23 and the first insulating film 21 prevent twist between the metal layers 11, 13 and maintain a pitch between the metal layers 11, 13. The second insulating film 23 and the first insulating film 21 can be used as a main body or a holding member to fix the metal layers 11, 13.
Although not shown in the drawings, at least the first inner insulating film 21 and the inner surface of the guiding member 31 on the portions 11-2, 13-2 of the metal layers 11, 13 may have a structure along the metal layer 11, One of the inclined regions B3 of 13 is inclined at an inclination angle.
The insulating film 21, 23 may include a light-transmitting or non-light-transmitting film, and, for example, may include a polyimide (PI) film, a polyethylene. Polyethylene terephthlate (PET) film, ethylene vinyl acetate (EVA) film, polyethylene naphthalate (PEN) film, triacetyl acetate (triacetyl) Cellulose, TAC) membrane, polyimide imide (PAI) membrane, polyether ether ketone (PEEK) membrane, perfluoroalkoxy (PFA) membrane, polyphenylene A polyphenylene sulfide (PPS) film, and a resin film (such as PE, PP, and PET).
An adhesive layer may be formed between the insulating films 21, 23, and the insulating films 21, 23 may be bonded to the metal layers 11, 13. Alternatively, the insulating films 21, 23 may include a double-sided or single-sided adhesive tape.
The insulating films 21, 23 may have a predetermined reflectance, for example, a reflectance of about 30% or more; and this reflective property may improve the surface reflection efficiency in a device.
In addition, the insulating films 21, 23 may include an optical function. Here, the optical function may include a light transmissive film having a light transmittance of about 50% or more, and preferably, a light transmissive film having a reflectance of about 70% or more. The insulating films 21, 23 may include a phosphor substance. This fluorescent substance can be used on the top or bottom surface of the insulating films 21, 23 or added to the insulating films 21, 23. The various phosphors may include: YAG-based, silicate-based, and nitride-based at least one of And its emission wavelength may include a visible light series such as red, yellow, or green light. Alternatively, the insulating films 21, 23 may be implemented as a fluorescent film, and the fluorescent film absorbs light emitted from the light-emitting chip 41 to emit light having another wavelength.
In addition, the insulating films 21, 23 may include a moisture resistance film. The moisture-proof film prevents moisture from penetrating, thereby preventing the first and second metal layers 11, 13 from being oxidized and electrically short-circuited.
A part of the top surface, the lower surface, or the outer surface of the insulating films 21, 23 may have a predetermined uneven structure, but is not limited thereto.
The insulating films 21, 23 may have a thickness equal to or greater than the thickness of the metal layers 11, 13. For example, the insulating films 21, 23 may be formed to have a thickness of from about 30 μm to about 50 μm, and are preferably formed to have a thickness of from about 40 μm to about 60 μm.
The insulating films 21, 23 can be divided into: a first insulating film 21 on a peripheral portion of the top surfaces of the two metal layers 11, 13; and a boundary region between the second metal layers 11, 13 of the second insulating film 23 On the top. The second insulating film 23 extends from the first insulating film 21 and can be realized by a single film.
The guiding member 31 may be formed on the first insulating film 21, and the material thereof may be formed of a resin material such as a solder resist or a conductive material such as a solder paste. The solder resist may have a white color to effectively reflect an incident light. In addition, the guide member 31 may optionally include a highly reflective material such as Ag, Al, Cu, Au, Ag alloy, Al alloy, Cu alloy, and Au alloy. The reflective material can be formed as a single layer or multiple layers. The guiding member 31 can be formed by using a reflective metal on a metal seed layer such as Ag, Al, and Ni, and through an electroplating process.
Additionally, the guide 31 can comprise a non-metallic material. The non-metallic material may comprise a white resin, for example: a resin comprising at least one of solder resist, TiO 2 , and glass fiber (such as PPA); a polymer material (such as a thiol series or epoxy group). Series); or an insulating film material.
The guide member 31 may include a metal or non-metal material having a reflectance of about 50% or more; and preferably, may include a material having a reflectance of about 90% or more.
The guide member 31 may be formed to have a thickness of about 15 μm to about 500 μm, and may have a thickness equal to or different from the thickness of the insulating films 21, 23. The thickness of the guide 31 can be varied in consideration of an optical orientation angle distribution. In addition, the top surface of the guide member 31 may be formed at a top surface higher than the light-emitting wafer 41.
The guiding member 31 is formed on the first insulating film 21 to cover the circumference of the light-emitting chip 41, and may have a circular shape when viewed from a plan view. The guide member 31 may be a circular or polygonal guide ring and may prevent the resin layer 61 from overflowing.
The width of the guiding member 31 may be formed to be different from the width of the first insulating film 21. If the width of the guide 31 is equal to the width of the first insulating film 21, the surface reflection efficiency can be improved. If the width of the guide 31 is different from the width of the first insulating film 21, the guide 31 can be stably disposed on the first insulating film 21.
If the guide member 31 is electrically conductive, it may be disposed on the top surface of the first insulating film 21, and a portion thereof may be in contact with one of the two lead frames 11, 13. Further, if the guiding member 31 is formed of a non-conductive insulating material, it may extend from the top surface of the first insulating film 21 to the top surfaces of the metal layers 11, 13.
2 to 4 illustrate an improvement of the light-emitting device of FIG. 1.
Referring to FIG. 2, in the light-emitting device, a second insulating film 23 is disposed around a light-emitting wafer 41. The light-emitting wafer 41 is mounted on a first metal layer 11 via a hole in the second insulating film 23.
Referring to FIG. 3, in the light-emitting device, an insulating adhesive film 24 is further disposed under the plurality of metal layers 11, 13 to be supported between the metal layers 11, 13.
Referring to FIG. 4, in the illuminating device, a first guiding member 31 is disposed on a first insulating film 21, and a second guiding member 36 is further disposed around the luminescent wafer 41. The second guiding member 36 is used as a reflecting member to efficiently emit a light toward the surface of the light-emitting wafer 41. The material forming the second guide 36 may be the same as or different from the material forming the first guide 31. The second guiding member 36 is bonded to the first metal layer 11 and the distance from the light emitting wafer 41 may be smaller than the distance between the second insulating film 23 and the light emitting wafer 41. That is, the second guiding member 36 may be disposed between the light emitting wafer 41 and the second insulating film 23. The inner surface of the second guide 36 may be vertical or inclined to the top surface of the metal layer.
The structure disclosed in the first embodiment having a thickness difference and an inclined plane of one of the metal layers can be applied to one of the metal layers in another embodiment described below, and is not limited to the first embodiment.
Figure 6 is a perspective view of a light emitting device according to a second embodiment. Figure 7 is a cross-sectional view taken along line A-A.
Referring to Figures 6 and 7, the light-emitting device 100 includes: a plurality of metal layers 11, 13; an insulating film 20 comprising 21, 23 on the metal layers 11, 13, and a light-emitting chip between the metal layers 11, 13 On the metal layer 11, a conductive member 31 is disposed on the insulating film 21; and a resin layer 61 is disposed on the metal layers 11, 13 to cover the light-emitting wafer 41.
The metal layers 11, 13 may comprise at least two layers, and at least two metal layers 11, 13 are spaced apart from one another to be electrically open or substantially phase isolated. The metal layers 11, 13 are formed of a metal plate such as a lead frame.
The lower surfaces S3 of the metal layers 11, 13 are disposed on the same plane and all surfaces of the surface S1 are exposed. The heat dissipation efficiency can be improved via the lower surface S3 and the surface S1 of the metal layers 11, 13. At least two of the metal layers 11, 13 can be used as electrodes.
The metal layers 11, 13 may be made of Fe, Cu, an alloy containing Fe such as Fe-Ni, Al, an alloy containing Al, or an alloy containing Cu such as Cu-Ni and Cu-Mg-Sn. form. The metal layers 11, 13 may be formed of a single layer or a plurality of layers. The metal layers 11, 13 are formed of Fe or Cu. A reflective layer or a bonding layer formed of Al, Ag, or Au may be formed on the top and/or lower surfaces of the metal layers 11, 13.
If the metal layers 11, 13 are realized by a lead frame, the mechanical strength is strong, the coefficient of thermal expansion is large, the processing capability is excellent, and there is almost no loss when repeating a bending operation, and Plating or soldering can be easily performed.
The metal layers 11, 13 may be formed to have a thickness in the range of from about 15 μm to about 300 μm, and preferably from about 15 μm to about 50 μm. The metal layers 11, 13 can be used as a support frame for supporting the entire light-emitting device, and can be used as a heat sink for conducting heat generated by the light-emitting chip 41. With respect to the outer region of one of the metal layers 11, 13, a length Y1 in a first direction Y and a length X1 in a second direction X at a right angle to the first direction Y may vary according to the size of the light-emitting device .
The light-emitting device 100 does not require the use of a separate body, such as a resin-based body such as polyphthalamide (PPA). Therefore, it is not necessary to use an injection or molding process for joining the metal layers 11, 13 and the body. A portion of the metal layers 11, 13 may have a flexible curved shape, or may be bent at a predetermined angle, but is not limited thereto.
Hereinafter, to explain the first embodiment, the metal layers 11, 13 include a first metal layer 11 and a second metal layer 13. The first metal layer 11 and the lower surface S3 of the second metal layer 13 are disposed on the same plane, and may be bonded to a printed circuit board or a heat dissipation plate via solder.
A separation portion 17 is provided between the first metal layer 11 and the second metal layer 13. The separation portion 17 can substantially separate the first metal layer 11 from the second metal layer 13. The separation portion 17 may selectively have one of a straight line shape, a curved line shape, and a bending line shape. The width or form of the line may vary depending on the shape or size of the first metal layer 11 and the second metal layer 13. The separation portion 17 separates a metal frame into the first metal layer 11 and the second metal layer 13. The shape or size of the first metal layer 11 and the second metal layer 13 may vary depending on the width and position of the separation portion 17.
A distance G1 between the first metal layer 11 and the second metal layer 13 may be 10 μm or more, and the pitch, that is, the width of the separation portion 17, is to prevent electrical connection between the two metal layers 11 and 13. Short circuit or one of electrical interference. The separation portion 17 may be an empty area or may be filled with an insulating material, but is not limited thereto.
The first metal layer 11 or the second metal layer 13 may have various shapes such as a circular shape, a polygonal shape, and a hemispherical shape via a cutting process.
An oxidation preventing coating layer may be formed on the surfaces of the first metal layer 11 and the second metal layer 13. The oxidation resistant coating prevents surface deterioration of the first metal layer 11 and the second metal layer 13, and is formed of an Au, Al, or Ag material.
The insulating films 21 and 23 are disposed on the first metal layer 11 and the second metal layer 13, and the insulating films 21 and 23 may be formed around the top surface of one of the first metal layer 11 and/or the second metal layer 13.
The insulating films 21, 23 are bonded to the top surfaces of the first metal layer 11 and the second metal layer 13 to support the first metal layer 11 and the second metal layer 13. The insulating films 21, 23 are bonded to the top surfaces of the metal layers 11, 13, and can serve as a solid body.
The insulating film 21, 23 may comprise a light transmissive or opaque film, and, for example, may comprise a polyimide film, a polyethylene terephthlate (PET) film. , an ethylene vinyl acetate (EVA) film, a polyethylene naphthalate (PEN) film, a triacetyl cellulose (TAC) film, a polyamidoximine (polyamide imide, PAI) film, polyether ether ketone (PEEK) film, perfluoroalkoxy (PFA) film, polyphenylene sulfide (PPS) film, and a resin Membrane (such as PE, PP, and PET).
An adhesive layer may be formed between the insulating films 21, 23, and the insulating films 21, 23 may be bonded to the metal layers 11, 13. Alternatively, the insulating films 21, 23 may comprise a double-sided adhesive or a single-sided adhesive tape.
In addition, the insulating films 21, 23 may include an optical function. Here, the optical function may include a light transmissive film having a light transmittance of about 50% or more, and preferably, a light transmissive film having a reflectance of about 70% or more. The insulating films 21, 23 may include a fluorescent substance. This fluorescent substance can be used on the top or bottom surface of the insulating films 21, 23 or added to the insulating films 21, 23. The various phosphors may include: YAG-based, silicate-based, and nitride-based at least one of And its emission wavelength may include a visible light series such as red, yellow, or green light. Alternatively, the insulating films 21, 23 may be implemented as a fluorescent film, and the fluorescent film absorbs light emitted from the light-emitting chip 41 to emit light having another wavelength.
In addition, the insulating films 21, 23 may include a moisture proof film. The moisture-proof film prevents moisture from penetrating, thereby preventing the first and second metal layers 11, 13 from being oxidized and electrically short-circuited.
The insulating films 21, 23 may have a thickness equal to or greater than the thickness of the metal layers 11, 13. For example, the insulating films 21, 23 may be formed to have a thickness of from about 30 μm to about 500 μm, and are preferably formed to have a thickness of from about 40 μm to about 60 μm.
The insulating films 21, 23 can be divided into: a first insulating film 21 on the periphery of the top surface regions of the two metal layers 11, 13, and a second insulating film 23 on the top surface of an interface region between the two metal layers 11, 13. on. The second insulating film 23 is integrally connected to the first insulating film 21 as a part of the first insulating film 21. The first insulating film 21 and the second insulating film 23 may include the same material and may be formed of a film.
The width W1 of the first insulating film 21 may be uniform or may be partially different. The width W1 of the first insulating film 21 may be at least several tens of μm or more. The width W2 of the second insulating film 23 may be uniform or partially different. The width W2 of the second insulating film 23 may be larger than the pitch G1 between the metal layers 11, 13 such as 20 μm or more. The width W1 of the first insulating film 21 and the width W2 of the second insulating film 23 may be equal or different. The second insulating film 23 may have a width of at least 20 μm or more to support the two metal layers 11, 13.
The second insulating film 23 corresponds to the first metal layer 11 and the second metal layer 13 and may be formed on the top surfaces of the first metal layer 11 and the second metal layer 13 and has a width larger than the metal layer 11, The spacing between the 13th.
The outer surfaces of the insulating films 21, 23 may be disposed on the same plane as the surfaces of the first metal layer 11 and the second metal layer 13, or may be disposed on the surfaces of the first metal layer 11 and the second metal layer 13 The position inside.
In addition, the first insulating film 21 may be formed continuously or discontinuously. The continuous film structure includes a film, and the discontinuous film structure includes a plurality of films.
The insulating films 21, 23 may include open areas A1, A2. The open areas A1 and A2 are holes or areas, wherein the top surfaces of the first metal layer 11 and/or the second metal layer 13 can pass through the holes through the inner surfaces of the insulating films 21 and 23 (holes) Or exposed to these areas.
The open areas A1, A2 include: a first open area A1 that exposes a portion of the top surface of the first metal layer 11; and a second open area A2 that exposes the top surface of the second metal layer 13. a part of. The shape and size of the first open area A1 may be the same or different from the shape and size of the second open area A2. In the present embodiment, the two open areas A1, A2 are described together with the metal layers 11, 13. If the number of metal layers 11, 13 is greater than three. The number of open areas will also be increased. The shape and size of the open regions A1 and A2 may vary depending on the shape and width of the insulating films 21 and 23.
One of the open areas A1, A2, for example the second open area A2, may be formed with a minimum width of about 60 μm. Since the second open area A2 hinders the bonding of the second wires 52 when it has a narrow width, its width may be at least about 60 μm. The first open area A1 may have a width on which the light emitting wafer 41 is mounted, and the width thereof may be greater than the width of the second open area A2. Here, although the description mentions that the first open region A1 has the light-emitting wafer 41 and the second open region A2 is the joint region of the second wire 52, it may be replaced with each other, and is not limited thereto.
The guiding member 31 may be formed on the first insulating film 21, and the material thereof may include a resin material, a non-metal material, or a metal material. The guide member 31 can be defined as a dam member to prevent a reflection member and/or a resin from overflowing.
The guiding member 31 can be a resin material such as an anti-solder or a conductive material such as a solder paste. The solder resist may have a white color to effectively reflect an incident light. In addition, the guiding member 31 may optionally include a metal material such as Ag, Al, Cu, Au, Ag alloy, Al alloy, Cu alloy, and Au alloy. The metal material may be formed as a single layer or a plurality of layers. Alternatively, the guiding member 31 may be formed on a metal seed layer such as Ag, Al, and Ni using a reflective layer and formed through an electroplating process. The guiding member 31 may be formed of a material having a reflectance higher than that of the first insulating film 21.
The guide member 31 may be formed to have a thickness of about 15 μm to about 500 μm, and may have a thickness equal to or different from the thickness of the insulating films 21, 23. The thickness of the guiding member 31 may be greater than the thickness of the insulating films 21, 23. The thickness T2 of the guide member 31 can be further thicker in consideration of an optical orientation angle distribution. In addition, the top surface of the guide member 31 may be formed at a top surface higher than the light-emitting wafer 41.
The guiding member 31 is formed on the first insulating film 21 to correspond to the circumference of the light-emitting chip 41. The guide member 31 may have a frame shape, a ring shape, or a loop shape when viewed from a plan view. When viewed in a plan view, the guide member 31 may be a circle or a polygon to prevent the resin layer 61 from overflowing.
The width of the guiding member 31 may be formed to be different from the width of the first insulating film 21. If the width of the guide 31 is equal to the width of the first insulating film 21, the surface reflection efficiency can be improved. If the width of the guide member 31 is smaller than the width of the first insulating film 21, the guide member 31 can be stably disposed on the first insulating film 21. When the guide 31 is formed along the first insulating film 21, an open area is provided.
If the guide member 31 is electrically conductive, it may be disposed on the top surface of the first insulating film 21, and a portion thereof may be in contact with one of the metal layers 11, 13. Further, if the guide member 31 is formed of an insulating material, it can contact the top surfaces of the metal layers 11, 13.
The luminescent wafer 41 can be disposed on the first metal layer 11 and can be electrically connected to the first metal layer 11 and the second metal layer 13.
The illuminating wafer 41 can be realized by a visible light emitting diode to emit light such as red, green, blue, and white, or by an ultraviolet light emitting diode; however, it is not limited thereto.
The light-emitting wafer 41 can be realized by a lateral wafer having two electrodes disposed laterally, or a vertical wafer having two electrodes disposed on opposite surfaces of each other. The lateral wafer can be connected to at least two wires 51, 52, and the vertical wafer can be connected to at least one wire, such as wire 52.
The luminescent wafer 41 may be bonded to the first metal layer 11 by a conductive or insulating adhesive. Here, when an electrode is disposed on the lower surface of the light-emitting wafer 41, a conductive adhesive may be used; and when an insulating substrate is disposed on the lower surface of the light-emitting wafer 41, a conductive adhesive or Insulation adhesive.
The light emitting wafer 41 may be connected to the first metal layer 11 via the first wire 51 and may be connected to the second metal layer 13 via the second wire 52. In addition, the light emitting wafer 41 can be electrically connected to the first metal layer 11 and the second metal layer 13 by a flip chip method.
The above description mentions that the light-emitting wafer 41 is disposed on the first metal layer 11. However, the light emitting wafer 41 may be disposed on the first metal layer 11 and/or the second metal layer 13, and is not limited thereto.
The light emitting wafer 41 may be connected to the first metal layer 11 via the first wire 51 and may be connected to the second metal layer 13 via the second wire 52. Here, the light-emitting wafer 41 may be formed to have a thickness of about 80 μm or more, and one of the wires 51, 52 may be formed to have a peak point of at least 40 μm higher than the top surface of the light-emitting wafer 41.
A phosphor layer may be coated on the surface of the light-emitting wafer 41 and may be formed on the top surface of the light-emitting wafer 41.
In addition, a protection device for protecting the illuminating wafer 41, such as a Zener diode or a transient voltage suppressor (TVS) diode, is disposed on the first metal layer 11 and The second metal layer 13 is above or below at least one of them to be electrically connected to the light-emitting wafer 41. The protection device is connected to the first and second metal layers 11, 13 to be connected in parallel with the light-emitting chip 41, thereby protecting the light-emitting wafer 41 from being applied to one of the abnormal voltages. influences. However, the protection device may not be provided.
The resin layer 61 may be disposed on the first metal layer 11 and the second metal layer 13, and a portion thereof may be formed on the top surface of the first insulating film 21. The resin layer 61 is provided in an open area of one of the inner surfaces of the guide 31. The open area of the guide 31 may be larger than the first and second open areas A1, A2. The resin layer 61 covers an inner surface area such as the first open area A1 and the second open area A2. The resin layers 61 may be separately provided on the first open area A1 and the second open area A2, respectively.
The resin layer 61 may contain a light transmissive resin-based material such as a mercapto group or an epoxy resin.
The resin layer 61 may be formed to have a thickness T3 of from about 80 μm to about 500 μm, and may include a single layer or a plurality of layers. When it is a plurality of layers, the lowermost layer may have a thickness of less than 80 μm.
When the resin layer 61 is a plurality of layers, layers having the same or different materials may be stacked, or sequentially stacked in a sequence from a low hardness layer to a high hardness layer, or a layer from a high reflectance layer to a low reflection layer. The order of the layers is sequentially stacked.
A portion of the top surface of the resin layer 61 may be formed at a position lower than the top surface of the guide member 31, or may be formed at a position higher than the top surface of the insulating films 21, 23. In addition, the resin layer 61 may have a height to cover the wires 51, 52; however, it is not limited thereto.
The resin layer 61 may contain a fluorescent substance. The phosphor material may comprise at least one of phosphors having a visible wavelength such as a yellow, green, or red wavelength. The resin layer 61 can be divided into a light transmissive resin layer and a phosphor layer, which can then be stacked. A fluorescent film such as a photo luminescent film (PLF) may be disposed above/below the resin layer 61, but is not limited thereto.
A lens may be disposed on the resin layer 61, and it may have a concave lens shape, a convex lens shape, and a meniscus lens shape. Further, the lens may be in contact with or spaced apart from the top surface of the resin layer 61, but is not limited thereto.
7 to 14 illustrate the manufacturing process of the light emitting device of FIG. 5.
Referring to FIG. 7 and FIG. 8, a metal layer 10 may be formed to be sized to manufacture a plurality of light-emitting devices in a first direction (horizontal or vertical) in a size of a light-emitting device of FIG. Or to make a plurality of light-emitting devices arranged in a matrix shape in one of horizontal and vertical directions. The metal layer 10 having the light-emitting devices can be fabricated to be cut into a single light-emitting device or at least two light-emitting devices. In the following, to illustrate an embodiment, a metal layer for fabricating a light-emitting device will be used.
The metal layer 10 can be realized by a metal plate such as a lead frame, and it can be made of Fe, Cu, an alloy containing Fe such as Fe-Ni, Al, an alloy containing Al, or an alloy containing Cu such as Cu- Ni and Cu-Mg-Sn are formed. Alternatively, the metal layer 10 can be a single layer or multiple layers. A reflective layer or a bonding layer formed of Al, Ag, Au, or solder resistant may be formed on the top and/or lower surface of the metal layer 10. The plating process or the coating process of the metal layer 10 can be performed before or after the formation of the insulating films 21, 23.
The metal layer 10 can be formed to a thickness of from about 15 μm to about 300 μm, and this thickness can be used to support the entire light-emitting device.
Since the metal layer 10 and an additional body, such as a resin-based body such as polyphthalamide (PPA), are not formed by an injection molding process, one part of the metal layer 10 can be It has a flexible curved shape or can be bent at a predetermined angle.
Figure 9 is a cross-sectional view of Figure 8.
Referring to FIGS. 8 and 9, an insulating film 20 including 21, 23 is formed on the metal layer 10. The insulating film 20 including 21, 23 may be formed with a thickness T1 of about 30 μm to about 500 μm in one thickness direction of the metal layer 10. In addition, the insulating film 20 may be formed to be thicker than the metal layers 11, 13. Here, according to the description of the present embodiment, the insulating film 20 including 21, 23 is bonded to the metal layer 10. However, the metal layer 10 may be bonded to the insulating film 20 including 21, 23, and these manufacturing orders may be interchanged with each other.
The insulating film 20 may be bonded to the metal layer 10 after using an adhesive layer. The bonding process of the insulating films 21, 23 can be performed at a predetermined temperature via a laminating process after the insulating films 21, 23 are bonded to the metal layer 10.
As an insulating film, the insulating films 21, 23 may selectively include a film having an optical function, a heat conduction function, and a humidity resistance. The insulating film 21, 23 may include a polyimide film, a polyethylene terephthlate (PET) film, an ethylene vinyl acetate (EVA) film, a polyethylene naphthalate (PEN) film, a triacetyl cellulose (TAC) film, a polyimide imide (PAI) film, a polyether ether ketone (polyether) Ether ketone, PEEK) film, a perfluoroalkoxy (PFA) film, a polyphenylene sulfide (PPS) film, and a resin film (such as PE, PP, and PET).
The insulating films 21, 23 may be formed of a film having an adhesive layer such as a double-sided adhesive or a single adhesive tape.
When the insulating films 21, 23 are formed of a light transmissive material, they may include a fluorescent substance and/or a scattering substance. This fluorescent or scattering substance can be used on the surface of the insulating films 21, 23 or added to the insulating films 21, 23.
The insulating films 21, 23 may include a film type having a reflective property of a predetermined reflectance, for example, a reflectance of 30% or more.
After the plurality of open regions A1, A2 are formed, the insulating films 21, 23 may be bonded to the metal layers 11, 13. The open areas A1, A2 may be holes in a single membrane, or an open area. The insulating films 21 and 23 are provided apart from each other by the open regions A1 and A2. The insulating films 21, 23 may be divided into a first insulating film 21 around the first open region A1 or around the metal layer 10, and a second insulating film 23 around the second open region A2. The second insulating film 23, as a part of the first insulating film 21, can be integrally formed with the first insulating film 21. The first and second insulating films 21, 23 can be realized by a single film.
The width W1 of the first insulating film 21 may be uniform or may be partially different. The width W1 of the first insulating film 21 may be at least several tens of μm or more. The width W2 of the second insulating film 23 may be uniform or partially different. The width W2 of the second insulating film 23 may be larger than the pitch G1 between the metal layers 11, 13 such as 20 μm or more. The width W1 of the first insulating film 21 and the width W2 of the second insulating film 23 may be equal or different.
One of the open areas A1, A2, such as the second open area A2, may be formed with a minimum width of about 60 μm. This width can fall within a range that does not impede wire bonding. The first open area A1 may have a width on which an illuminating wafer is mounted and may have a width greater than a width of the second open area A2. Here, although the first open region A1 is a region having a light-emitting chip, and the second open region A2 is described as a joint region of a wire, it may be replaced with each other, and is not limited thereto.
The first open area A1 and the second open area A2 may be open areas having a predetermined shape by a punching process, a cutting process, or an etching process on a single insulating film. The width or shape of the first open area A1 and the second open area A2 may be varied. The open areas A1, A2 may be formed before/or after the insulating film 20 including 21, 23 is bonded to the metal layer 10.
The top surface of the metal layer 10 may be exposed through the first open area A1 and the second open area A2 of the insulating films 21, 23.
The insulating films 21, 23 may be formed by printing another material such as an insulating material such as an oxide such as Al 2 O 3 , SiO 2 , SiO x , SiO x N y or a nitride; or alternatively, may be formed by coating an insulating material. In this case, the cured insulating films 21, 23 may be formed of a material having a certain flexibility or a predetermined viscosity.
A mesh or an uneven shape may form or a plurality of fine holes may be further formed on one inner surface of the insulating film 21, 23 or an inner predetermined region, but the present invention does not Limited to this.
Referring to Figures 10 and 11, the metal layer 10 of Figure 8 can be divided into a plurality of metal layers 11, 13. The metal layers 11, 13 may comprise at least two layers that may be used as electrodes to provide electrical power.
Here, a circuit forming process of the metal layer includes: activating a surface of the lead frame; applying a photo resist; performing an exposure process; and performing a development process ( Developing process). When the development process is completed, a necessary circuit is formed through an etching process, and then the photoresist is laminated. Then, a silver plating treatment is performed on the surface of the metal layer to treat the surface to be bonded.
The width of the first metal layer 11 and the width of the second metal layer 13 may be equal or different. For example, the size of the first metal layer 11 may be larger or smaller than the size of the second metal layer 13. Alternatively, the first metal layer 11 and the second metal layer 13 may have the same area or a shape that is symmetrical to each other.
The first metal layer 11 and the second metal layer 13 are disposed apart from each other by a predetermined separation portion 17, and the distance G1 between them may be greater than 10 μm and may be smaller than the width W1 of the second insulating film 23.
The second insulating film 23 maintains the pitch G1 between the first metal layer 11 and the second metal layer 13, and the first insulating film 21 supports the metal layers.
Here, the second metal layer 13 may extend into the inside through one surface of the first metal layer 11, and the lengths D1, D2 may vary according to the second open region A2 and the insulating films 21, 23.
Referring to Figures 9 and 12, a guide member 31 is formed on the top surface of the insulating films 21, 23. The guide member 31 is formed by one of a printing method, a coating method, and a film bonding method. In the printing method, a mask is used for an area other than the portion to be printed, and then a screen print method is performed. In the coating method, a reflective material is applied to a desired area. In the film sticking method, a film type such as a reflective sheet can be joined. Here, the material of the guiding member 31 and the insulating films 21, 23 may be selected in consideration of thermal characteristics thereof according to a wire bonding or a reflow process.
The guiding member 31 can be fabricated in a printing manner using an anti-solder or a solder paste. The solder paste is white to effectively reflect an incident light. In addition, the guiding member 31 may optionally include a highly reflective material such as Ag, Al, Cu, Au, Ag alloy, Al alloy, Cu alloy, and Au alloy, and the reflective material may include a single layer or multiple layers. An electroplating process can be performed on a metal seed layer, such as a layer of Ag, Al, or Ni material to form the lead 31.
Additionally, the guide 31 can comprise a non-metallic material. The non-metallic material may comprise a white resin, such as a resin comprising mixed TiO 2 and glass fibers (such as PPA). If the guide member 31 has insulating and reflective properties, it is not necessary to additionally use an insulating film; however, the present invention is not limited thereto.
The guide member 31 may be formed to have a thickness of about 15 μm to about 500 μm, and the thickness may be equal to or different from the thickness of the insulating films 21, 23. The thickness T2 of the guide member 31 and the arrangement structure can be varied in consideration of an optical orientation angle distribution.
The guiding member 31 may be formed on the first insulating film 21 to cover the circumference of the light emitting wafer 41. The shape may be a frame shape, a loop shape, or a ring shape when viewed from a plan view. The guiding member 31 may be formed continuously or discontinuously on the top surface of the first insulating film 21.
The width of the guiding member 31 may be formed to be different from the width of the first insulating film 21. If the width of the guide 31 is equal to the width of the first insulating film 21, the surface reflection efficiency can be improved. If the width of the guide member 31 is different from the width of the first insulating film 21, the guide member 31 can be stably disposed on the first insulating film 21.
If the guide 31 has electrical conductivity, it can be disposed on the top surface of the first insulating film 21. A portion thereof may be in contact with one of the two lead frames 11, 13. Further, if the guiding member 31 is formed of an insulating material, it may extend from the top surface of the first insulating film 21 to the top surface of the metal layers 11, 13.
Referring to FIG. 12 and FIG. 13 , the luminescent wafer 41 is disposed on the first metal layer 11 and electrically connected to the first metal layer 11 and the second metal layer 13 .
The light emitting wafer 41 may be connected to the first metal layer 11 via the first wire 51 and may be connected to the second metal layer 13 via the second wire 52. In addition, the luminescent wafer 41 can be electrically connected to the first metal layer 11 and the second metal layer 13 by a flip chip method.
Referring to Figures 13 and 14, the resin layer 61 may comprise a light transmissive resin-based material such as tantalum or epoxy.
The resin layer 61 covers an inner surface area such as the first open area A1 and the second open area A2. The resin layers 61 may be separately provided on the first open area A1 and the second open area A2, respectively.
Figure 15 is a cross-sectional view showing a light-emitting device according to a third embodiment.
Referring to FIG. 15 , an illuminating wafer 41 is bonded to the first metal layer 11 to be electrically connected to the first metal layer 11 and connected to the second metal layer 13 via a wire 52 .
An insulating film 24 may be bonded under the first metal layer 11 and the second metal layer 13. The insulating film 24 maintains a pitch between the first metal layer 11 and the second metal layer 13 at a predetermined value and is supported between the first metal layer 11 and the second metal layer 13.
A resin layer 61 can be injection molded to have a predetermined shape via a transfer molding method. According to the transfer molding method, a liquid resin is filled in a frame having a predetermined shape and then cured; whereby a resin layer 61 having a desired shape can be formed. The shape of the resin layer 61 may further be a cylindrical shape, a polygonal column shape, an uneven surface shape, or a concave shape; and is not limited thereto.
A portion 61A of the resin layer 61 may be formed between the first metal layer 11 and the second metal layer 13 and may be in contact with the top surface of the insulating film 24.
The outer surface of the resin layer 61 may be disposed at a position further inside than a portion other than the first metal layer 11 or the second metal layer 13 by a predetermined pitch T3. Accordingly, the outer top surfaces of the first metal layer 11 and the second metal layer 13 can be exposed. The pitch T3 can be greater than 1 μm.
In addition, a reflective layer may be further formed on a top portion or a surface of the resin layer 61, but is not limited thereto.
Figure 16 is a cross-sectional view showing a light-emitting device including a plurality of light-emitting wafers according to a fourth embodiment.
Referring to Fig. 16, the light emitting device includes at least three metal layers 11A, 11B, 11C, and at least two light emitting wafers 41A, 41B. The luminescent wafers 41A, 41B can emit light having the same or different peak wavelengths.
The metal layers 11A, 11B, and 11C are arranged on the same plane. A first insulating film 21 is formed around the metal layers 11A, 11B, and 11C. The second insulating films 23A, 23B are respectively formed between the adjacent metal layers 11A, 11B and 11B, 11C to support and fix the adjacent metal layers 11A, 11B and 11B, 11C. The third insulating film 22 is formed at the center of the second metal layer 11B to divide it into two regions.
The first to third insulating films 21, 23A, 23B, 22 may be formed of a single film or may be formed of separate films, respectively; and are not limited thereto.
A first luminescent wafer 41A and a second luminescent wafer 41B are disposed apart from each other and disposed on the second metal layer 11B, and a third insulating film 22 is disposed on the first luminescent wafer 41A and the second luminescent wafer 41B. between.
A guiding member 31 is formed on the first insulating film 21 and the third insulating film 22. The guide 31 is formed at a position higher than the light-emitting wafer 41 to reflect the light emitted from the light-emitting wafers 41A, 41B.
The resin layers 62, 63 are formed on the first and second light-emitting wafers 41A, 41B, respectively, and a portion of the resin layers 62, 63 may be formed at the same or lower height as the top surface of the guide 31; however, it is not limited herein.
The second metal layer 11B can be used as one of the common electrodes of the first light-emitting wafer 41A and the second light-emitting wafer 41B. The first metal layer 11A can be used as one of the electrodes for controlling the first light-emitting wafer 41A, and the third metal layer 11C can be used as one of the electrodes for controlling the second light-emitting wafer 41B.
According to the description of the embodiment, the two light-emitting wafers 41A, 41B are disposed on the left and right sides. However, more than three luminescent wafers may be arranged in a matrix or in a straight line that intersects the same center. The luminescent wafers may be connected to each other in series or parallel to each other, and are not limited thereto.
17 and 18 are a perspective view and a cross-sectional view showing a light-emitting device according to a fifth embodiment.
Referring to FIGS. 17 and 18, an insulating film 25 is adhered to a circumference of a top surface region of a second metal layer 13 to support the first metal layer 11 and the second metal layer 13. The insulating film 25 covers a separation portion 17 between the first metal layer 11 and the second metal layer 13 to be supported between the first metal layer 11 and the second metal layer 13.
A lead member 32 is formed around the top surface area of the first metal layer 11, and a portion thereof may be disposed on the outer top surface of the insulating film 25. The guide member 32 may be disposed around the top surface area of the first metal layer 11 and on the outer top surface of the insulating film 25. The guiding member 32 can be electrically connected to the top surface of the first metal layer 11 and can be electrically isolated from the top surface of the second metal layer 13 by the insulating film 25. The guide member 32 may be formed in a loop shape, a frame shape, or a ring shape around the first metal layer 11 and the insulating film 25. The insulating film 25 may be formed in a ring shape, a frame shape, or a circular shape in a top surface region of the second metal layer 13.
The insulating film 25 prevents actual or electrical contact between the conductive member 32 and the second metal layer 13, and also avoids electrical short between the first metal layer 11 and the second metal layer 13. The insulating film 25 and the guiding member 32 can support and fix the adjacent two metal layers 11, 13. One of the thicknesses of the guide member 32 may be equal to the thickness of the resin layer 61.
According to the present embodiment, the area of the insulating film 25 is reduced, and the area of the guide member 32 is increased, so that the light reflection efficiency can be improved.
19 and 20 are plan and cross-sectional views showing a light-emitting device according to a sixth embodiment.
Referring to FIGS. 19 and 20, insulating films 21, 23 are formed on the entire top surface of the first and second metal layers 11, 13, and include a plurality of open regions A1, A2, A3. The open areas A1, A2, and A3 include: a first open area A1 in which one of the light emitting chips 41 is mounted; and a second open area A2 in which a second wire 52 is bonded to a second metal layer 12; A third open area A3, wherein a first wire 51 is bonded to a first metal layer 11. As another example, when the light-emitting wafer 41 has a vertical electrode structure, the third open region A3 may not be formed.
The first to third open areas A1, A2, A3 may be formed with a circle or a polygon. Here, the size of the second open area A2 may be at least 4 times smaller than the area of the lower portion of the light-emitting wafer 41. The width or diameter of the first to third open regions A1, A2, A3 may be greater than a wire diameter (e.g., from about 20 μm to about 50 μm), such as from about 60 μm to about 120 μm.
Since the adhesion regions of the insulating films 21, 23 have a width greater than that of the structure of Fig. 1, they provide a more stable support to the first and second metal layers 11, 13. A lead member 31 may be formed around the top surface of the insulating films 21, 23, and a resin layer 61 may be molded on the inner side surface of the guide member 31.
Figure 21 is a plan view showing another example of Figure 19.
Referring to Fig. 21, a light-emitting device includes three metal layers 11, 13, 15 and an insulating film 21 bonded to the metal layers 11, 13, 15. A plurality of open regions A1, A2, and A3 are formed on the insulating film 21, and the top surface portions of the metal layers 11, 13, 15 are respectively exposed.
A third metal layer 15 is disposed between the first metal layer 11 and the second metal layer 13, and an illuminating wafer 41 is mounted on the third metal layer 15. The light emitting chip 41 is disposed on a first open area A1, and a second open area A2 and a third open area A3 may be wire bonding areas.
The light-emitting chip 41 is connected to the first metal layer 11 of the third open region A3 via a first wire 51, and is connected to the second metal layer 13 of the second open region A2 via a second wire 52.
On the open areas A1, A2, and A3 of the insulating film 21, the light-emitting wafer 41 and the wires 51 and 52 are provided on the metal layers 11, 13, and 15. In addition, the insulating film 21 is firmly supported between the metal layers 11, 13, 15 and prevents a step difference between the lower surfaces of the metal layers 11, 13, 15 to improve electrical reliability of solder bonding. Degree and improve heat transfer efficiency.
22 to 31 illustrate a modified example of an insulating film and a metal layer according to an embodiment of the invention.
Referring to FIG. 22, a second metal layer 13 may be disposed on at least one portion of the first metal layer 11, and may be formed with a circular shape, a polygonal shape, or a random shape on one surface of the first metal layer 11. A separation portion 17 between the first metal layer 11 and the second metal layer 13 may be formed with a uniform or irregular width.
The first metal layer 11 and the second metal layer 13 may have mutually corresponding sides in the irregular structures 11D, 13D. The irregular structures 11D, 13D can improve the bonding efficiency of the insulating film 23.
As shown in FIG. 23, the second metal layer 13 may have a predetermined shape, such as a circle or a polygon, on at least one edge region of the first metal layer 11.
As shown in FIGS. 24 and 25, the second metal layer 13 may have a hemispherical shape on at least a portion of the first metal layer 11, or may have a polygonal shape on one of the edge regions of the first metal layer 11.
As shown in FIG. 26, the second and third metal layers 13A, 13B may have an annular shape or a polygonal shape on at least two edge regions of the first metal layer 11. The second and third metal layers 13A, 13B may be formed on both edge regions where the first metal layer 11 faces each other, or may be used as an electrode. One of the second and third metal layers 13A, 13B may serve as a dummy pattern. The insulating films 21, 23 may be formed around the three metal layers 11, 13A, 13B, and the top surfaces of the three metal layers 11, 13A, 13B may be exposed by the open regions A1, A2.
As shown in FIG. 27, the first metal layer 11 and the second metal layer 13 are separated by a separation portion 17 at the center, and may have the same or symmetrical regions. The length L1 of the first surface of one of the second metal layers 13 may be smaller than the length L2 of the opposite one of the second surfaces, but is not limited thereto.
Referring to FIG. 28, the second metal layer 13 may be formed on a portion of the first metal layer 11. The first direction width X3 may be at least 1/2 times larger than the first direction width X2 of the first metal layer 11.
The first direction width Y3 of the second metal layer 13 may be at least 1/2 times larger than the second direction width Y1 of the first metal layer 11.
An insulating film 21 is formed on one of the boundary portions of the first and second metal layers 11, 13. The insulating film 21 covers one region other than the second open region A2, and one of the outer top surfaces of the second metal layer 13 can be exposed without forming the insulating film 21.
An illuminating chip is mounted on the open area A1 of the second metal layer 13 and electrically connected to the two metal layers 11 and 13.
Referring to FIG. 29, the second metal layer 13 may be formed on an edge portion of the first metal layer 11, and the first direction width X4 and the second direction width Y4 of the second metal layer 13 may be the first direction of the first metal layer 11. The width X1 is at least 1/2 times larger than the second direction width Y1.
Since a conductive member is formed without forming an insulating film on the outer top surface of the second metal layer 13, the area covered by the conductive member can be increased.
Referring to FIG. 30, the second metal layer 13 extends into the interior through one side portion of the first metal layer 11, but may be formed in the first metal layer 11.
The width W5 of the outer portion 13-1 of the second metal layer 13 may be smaller than the width W6 of the inner portion 13-2. An illuminating wafer may be disposed on the first open region A1 of the second metal layer 13, and is not limited thereto.
Referring to FIG. 31, the second metal layer 13 may have a diameter equal to the width of the first metal layer 11, and have a half-spherical shape. An insulating film 21 may be formed on a top surface of a boundary portion between the first metal layer 11 and the second metal layer 13, and a conductive member may be formed around the first metal layer 11 and the second metal layer 13.
Referring to FIG. 32, a first insulating film 21 is formed around a top surface region of the first metal layer 11 and the second metal layer 13, and a second insulating film 23 is formed to cover the first metal layer 11 and the second metal. Between layers 13. The first insulating film 21 and the second insulating film 23 are connected to each other, and an open region is formed between the first insulating film 21 and the second insulating film 23.
A resin layer 63 is formed in an open region of the first insulating film 21 to cover the light-emitting wafer 41. The resin layer 63 is cured by an insulating material of a liquid resin series. At this time, the first insulating film 21 is used as a blocking member around the resin layer 63. The resin layer 63 may have a surface in the shape of a convex lens. The central portion of the resin layer 63 may have a thickness larger than that of the first insulating film 21 and the second insulating film 23.
A guide member 31 or a reflective material may be further formed around the resin layer 63, and is not limited thereto.
Referring to FIG. 33, an illuminating wafer 45 is die-bonded to the first metal layer 11 and connected to a second metal layer 13 via a wire. The resin layer 63 is formed on the first metal layer 11 and the second metal layer 13.
The resin layer 63 is provided on the top surfaces of the first metal layer 11 and the second metal layer 13, and an insulating film 21 is provided around the resin layer 63. The resin layer 63 is formed in a convex lens shape. A guide member 31 or a reflective material may be further formed around the resin layer 63, and is not limited thereto.
A spacer 18 is disposed on a separation portion 17 between the first metal layer 11 and the second metal layer 13. The separator 18 is disposed between the first metal layer 11 and the second metal layer 13 and includes an insulating material. The spacer 18 is adhered between the first metal layer 11 and the second metal layer 13 and is spaced apart from the first metal layer 11 and the second metal layer 13 to prevent electrical short circuit. The separator 18 may include at least one of SiO 2 , SiO x , SiO x N y , Si 3 N 4 , and Al 2 O 3 .
The lower surface of the resin layer 63 may be in contact with the top surfaces of the first metal layer 11 and the second metal layer 13 and the top surface of the separator 18.
Referring to Fig. 34, a rough surface 63A is formed on the surface of a resin layer 63. The rough surface 63A may be formed by performing an etching or an ejection process on the surface of the resin layer 61 to form a rough surface. The rough surface 63A changes the critical angle of light entering the resin layer 63, thereby improving light extraction efficiency.
Referring to FIG. 35, an illuminating wafer 41 can be mounted on a first metal layer 11 and a second metal layer 13 via a flip chip method. The light-emitting wafer 41 is mounted on the first metal layer 11 and the second metal layer 13. The widths of the first metal layer 11 and the second metal layer 13 may be equal to each other.
A second insulating film 24 is bonded to the lower surfaces of the first metal layer 11 and the second metal layer 13 to insulate and support the first metal layer 11 and the second metal layer 13.
A first insulating film 21 is bonded around the top surface regions of the first metal layer 11 and the second metal layer 13 to fix the first metal layer 11 and the second metal layer 13.
The first insulating film 21 serves as a blocking member to prevent the resin layer 63 from overflowing. A portion of the resin layer 63 may be filled between the first metal layer 11 and the second metal layer 13, and maintain a distance between the first insulating film 21 and the first metal layer 11 and the second metal layer 13.
The resin layer 63 may have a convex hemispherical shape, and a depressed portion 63B having a predetermined depth is formed at the center of the resin layer 63. The depressed portion 63B may have a horn shape or a half ball shape, and a reflective material 72 may be formed in the recess portion 63B. Reflective material 72 can include a metal oxide and can be formed from at least one of the layers comprising TiO 2 and/or SiO 2 to reflect an incident light in a lateral direction. The resin layer 63 and the reflective material 72 may have different reflectivities, respectively. For example, reflective material 72 can have a higher reflectivity. The resin layer 63 reflects light in a central direction toward one side, so that an optical orientation angle distribution can be uniformly formed.
In addition, the depressed portion 63B may be formed of a scattering substance instead of a reflective material; however, it is not limited thereto.
Referring to Fig. 36, a guide member 33 is formed on one surface of the resin layer 61. After the resin layer 61 is formed, the guide member 33 may be provided by performing a sputtering or deposition method on at least two surfaces of the resin layer 61. Because of the guide member 33, the manufacturing process can be varied, and the width and thickness of the guide member 33 can be adjusted according to a deposition time. The guide member 33 may be formed of a reflective material including a metal such as Al or Ag, or may be formed of a light transmissive material having high reflectivity.
Referring to Fig. 37, in a light-emitting device, a lens 71 is provided on the resin layer 61. The lens 71 on the resin layer 61 may have a convex hemispherical shape and may be adhered to the top surface of the resin layer 61 and the guide member 31. The guide 31 and the lens 71 may have an uneven surface and are not limited thereto.
Referring to Fig. 38, in a light-emitting device, three metal layers 11, 13, 15 are disposed. Among the three metal layers 11, 13, 15, the first and second metal layers 11, 13 can be used as an electrode, and the third metal layer 15 can be disposed between the first and second metal layers 11, 13. As a heat sink.
A first insulating film 21 is formed around the top surface regions of the first to third metal layers 11, 13, 15 to serve as a barrier for the resin layer 61 and to support the metal layers 11, 13, 15. The second and third insulating films 24A, 24B are bonded to a region between the first and third metal layers 11, 15 and a region between the second and third metal layers 13, 15 to support A region between the first and third metal layers 11, 15 and a region between the second and third metal layers 13, 15. The second and third insulating films 24A, 24B prevent electrical short circuits between adjacent metal layers. The second and third insulating films 24A, 24B may be provided as a single film, or as separate films separated by one of the different regions.
Further, a portion 61A of the resin layer 61 is filled between the first and third metal layers 11, 15 and between the second and third metal layers 13, 15 to adhere to the surface of the adjacent metal layer. Here, after the resin layer 61 is cured, the second and third insulating films 24A, 24B can be removed. The metal layers 11, 13, 15 are supported by the resin layer 61 and the first insulating film 21, and the lower surface thereof may be formed to be flat.
A phosphor layer 73 is formed on the top surface of the resin layer 61, and may be a film type containing one of phosphors or a phosphor layer added to one of the resin layers. The phosphor layer 73 may be formed from the top surface of the resin layer 61 to the top surface of the guide 31. The phosphor layer 73 absorbs a portion of the light emitted from the light-emitting wafer and then emits a light having a longer wavelength than the absorbed light, thereby shifting the color coordinate distribution to the desired distribution. .
Referring to Fig. 39, in a light-emitting device, a second guide member 34 is further provided on the second and third insulating films 23A, 23B.
The second and third insulating films 23A, 23B cover the separation portions 17A, 17B between the adjacent metal layers 11, 13, 15 to be bonded to the top surface of the interface between the metal layers 11, 13, 15. Then, a second guiding member 34 is formed on the second and third insulating films 23A, 23B. A first guiding member 31 is formed on the first insulating film 21. The light-emitting wafers 41, 42, 43 are disposed in the open regions of the first guide 31 and the second guide 34. The first guiding member 31 and the second guiding member 34 are disposed around the light emitting wafers 41, 42, 43 to effectively reflect an incident light.
The first light-emitting wafer 41 is disposed on the first metal layer 11, the second light-emitting wafer 42 is disposed on the third metal layer 15, and the third light-emitting wafer 43 is disposed on the second metal layer 13. The first light-emitting wafer 41 is connected to one of the first metal layer 11 and the second light-emitting chip 42 via the wires 51 and 52. The second electrode of the second luminescent wafer 42 is connected to the first electrode of the third luminescent wafer 43 via a wire 54. The second electrode of the third luminescent wafer 43 is connected to the second metal layer 13 via a wire 52. The second light emitting wafer 42 is directly connected to other light emitting wafers, and is not limited thereto.
The first light-emitting wafer 41 is connected to the first metal layer 11 via a wire 51. The first light-emitting wafer 41 and the second light-emitting chip 42 are connected to each other via a wire 53. The third light emitting wafer 43 may be connected to the second metal layer 13 via the wires 52.
Referring to Fig. 40, in a light-emitting device, a resin layer 61 may have a concave surface. For example, the resin layer 61 may have a lens shape with a high surface portion and a low center portion. The gap T6 between the surface portion and the central portion of the resin layer 61 may be from about 0.001 mm to about 1 mm. This gap T6 prevents contact with the light guide plate to avoid an abnormal color distribution such as chromatic blur due to its contact.
Referring to FIG. 41, a first guiding member 31 is formed on a first insulating film 21, and a second guiding member 36 is formed around a luminescent wafer 41. The second guiding member 36 may be formed around the light emitting wafer 41 and have a thickness larger or smaller than the light emitting wafer 41. A portion of the second guiding member 36 may be disposed between the light emitting wafer 41 and the second insulating film 23. Another portion of the second guide 36 may be disposed between the light emitting chip 41 and a first wire 51.
The second guide member 36 may be formed with a frame shape, a ring shape, or a circular shape. The second guiding member 36 may be formed in the first open region A1 of the first metal layer 11 to effectively reflect light from the light emitting wafer 41.
The first guiding member 31 may have the same width as the first insulating film 21. The first guiding member 31 is formed by performing a process such as punching after the first guiding member 31 is bonded to the first insulating film 21.
According to the present embodiment, the guide members 31, 36 are doubled around the light-emitting wafer 41 to improve light reflection efficiency and azimuth distribution.
Referring to Fig. 42, in a light-emitting device, first and third guiding members 37A, 37B are formed on a first insulating film 21. The first guiding member 37A is disposed on the top surface and the inner surface of the first insulating film 21, and the lower surface thereof is in contact with the top surface of the first metal layer 11. The third guiding member 37B is disposed on the top surface and the inner surface of the first insulating film 21, and the lower surface thereof is in contact with the top surface of the second metal layer 13. The first guide 37A extends to a top surface of the metal layers 11, 13 at a predetermined distance D3. The distance D3 can be greater than 0.1 mm.
If the first and third guide members 37A, 37B are formed of a non-metal material or an insulating resin material, they may be connected to each other.
If the first and third guiding members 37A, 37B are formed of a conductive material, they may be spaced apart from each other, and the separation region thereof is a gap between the first metal layer 11 and the second metal layer 13. Accordingly, the first guide 37A on the first metal layer 11 and the third guide 37B on the second metal layer 13 are separated from each other to avoid an electrical short.
In addition, the second guiding member 37C is formed on the top surface and the inner surface of the second insulating film 23 so that it can be in contact with the top surface of the first metal layer 11. The third guide 37B is connectable to the first guide 37A and is isolated from the second guide 37C. The second guide 37C may be spaced apart from the second metal layer 13.
The first guide 37A and the second guide 37C are disposed around the light-emitting wafer 45 to effectively reflect light from the light-emitting chip 45. The first guiding member 37A and the second guiding member 37C may be formed of a resin material, a non-metal material, or a reflective metal.
Moreover, the inner surfaces of the first guiding member 37A and the second guiding member 37C correspond to the illuminating wafer 45, and may have a curved or inclined shape with respect to the top mask of the first metal layer 11.
The first to third guides 37A, 37C, 37B may be formed of the same or different materials, and are not limited thereto. In another example, the first to third guiding members 37A, 37C, 37B may be formed of a metal material or an insulating material.
Referring to Fig. 43, in a light-emitting device, reflective layers 81A, 81B are further provided on a guide member 31.
The reflective layers 81A, 81B may be formed of a highly reflective metal such as Ag or Al, and have a reflectance of about 70% or more. The highly reflective metal can be formed via an electroplating or coating process. The reflective layers 81A, 81B may be formed on the top surface and surface of the lead 31 and the first insulating film 21. The reflective layers 81A, 81B may be discontinuously formed to be spaced apart from each other, thereby avoiding an electrical short between the first metal layer 11 and the second metal layer 13.
According to the above embodiment, by bonding the insulating films 21, 23A, 23B to the top surface regions of the metal layers 11, 13, the surfaces of the metal layers 11, 13 can be spaced apart from the insulating film 21 by a distance of about 1 μm or more; Limited to this.
Referring to FIG. 44, in a light-emitting device, an illuminating wafer 45 is bonded to a first metal layer 11, and a second metal layer 13 is connected to the luminescent wafer 45 via a wire 53. A second insulating film 23 is bonded to the top surface between the first metal layer 11 and the second metal layer 13.
A guiding member 31 is formed on the first metal layer 11 and the first insulating film 21 in a continuous or discontinuous shape such as a frame shape, a loop shape, or a ring shape. on.
A resin layer 63 may be formed in the guide member 31, and a phosphor layer 73 may be formed in the resin layer 63. The phosphor material of the phosphor layer 73 can be distributed over a full area and spaced apart from the luminescent wafer 45 to avoid discoloration.
Referring to Fig. 45, in a light-emitting device, a resin layer is removed, and a light-emitting film 74 is disposed on a light-emitting wafer 41. The luminescent film 74 is disposed to be spaced apart from the metal layers 11, 13, 15 and supported by the guide 31.
The second insulating films 24A, 24B may be disposed on the top or lower surface between the metal layers 11, 13, 15, but are not limited thereto.
Figure 46 is a cross-sectional view showing a light-emitting device; Figure 47 is a plan view showing Figure 46.
Referring to FIGS. 46 and 47, an illuminating wafer 41 is mounted on a first metal layer 11 and a second metal layer 13 via a flip chip method. An insulating film 21 is formed around the first metal layer 11 and the second metal layer 13. A spacer 18 formed of an insulating material may be formed between the first metal layer 11 and the second metal layer 13.
The separator 18 prevents the resin layer 66 from overflowing.
The resin layer 66 is formed around the light-emitting wafer 41, and a portion thereof may extend to the top surface of the insulating film 21.
Referring to Fig. 48, in a light-emitting device, insulating films 23, 24 are bonded to the top and bottom surfaces between a first metal layer 11 and a second metal layer 13. An illuminating wafer 45 is disposed on the first metal layer 11, and a resin layer 67 is molded on the luminescent wafer 45.
The surface of the resin layer 67 may be formed on the same straight line as the first metal layer 11 and the second metal layer 13. The width of the resin layer 67 may be a distance between the surfaces of the first metal layer 11 and the second metal layer 13.
Here, the resin layer 67 may have a thickness T4 which is the thickest at the center portion 67A and then thinner toward the outer portion 67B. The center portion 67A has a convex lens shape. The formed thickness T4 may be higher or lower than the light-emitting wafer 45. The resin layer 67 can be manufactured using an injection molding frame. Further, a plurality of light-emitting devices are cut and separated by a size unit of each of the light-emitting devices after the resin layer 67 is cured. Therefore, the light-emitting wafer 45 is mounted on the metal layers 11, 13, or the resin layer 67 is formed on the metal layers 11, 13 during the manufacturing process. A separation portion 17 between the metal layers 11, 13 may be formed by a laser or cutting process after the formation of the final resin layer, but is not limited thereto.
Referring to Fig. 49, in an illuminating device, an adhesive layer 29 is formed between the insulating films 21, 23 and the metal layers 11, 13. The adhesive layer 29 may use an insulating adhesive such as tantalum or epoxy. The thickness of the adhesive layer 29 can be about 12 μm or more.
In addition, the top surface of the resin layer 61 may be higher than the height of a first guiding member 31 or a second guiding member 31C.
The second guiding member 31C is disposed on the insulating film 21 to effectively reflect the light emitted from the light emitting wafer 41.
Referring to Figure 50, the top surfaces of the metal layers 11, 13 include uneven structures 11E, 13E. The uneven structures 11E, 13E may be disposed under a first insulating film 21 and may extend to the open regions A1, A2 of the metal layers.
The uneven structures 11E, 13E can improve a contact area of the insulating films 21, 23 on the metal layers 11, 13, and can improve heat dissipation efficiency.
Referring to FIG. 51, at least one inner surface of an insulating film and a guiding member 31 may be formed with inclined planes 21d, 31d. The inclined planes 21d, 31d may be formed from the inner surface of the first insulating film 21 to the inner surface of the guide 31. The inclined planes 21d, 31d may be formed on one surface or both surfaces of the first insulating film 21 and the guide 31.
The tilting angle of the inclined planes 21d, 31d with respect to the top surfaces of the metal layers 11, 13 may be from about 15° to about 89°. The inclined planes 21d, 31d are effective to reflect light to an outward direction. In addition, a reflective material may be coated on the inclined planes 21d, 31. The reflective material may be formed on a non-conductive material or an insulating material such as the adhesive layer to prevent electrical shorting between the metal layers.
The resin layer 61 may have a flat top surface, and the top width may be larger than the bottom surface width due to the inclined planes 21d, 31d.
Further, the inner surface of the second insulating film 23, for example, corresponding to the surface of the light-emitting wafer 45, may be formed as an inclined person, and is not limited thereto. Further, a second guide member is disposed on the second insulating film 23, and an inner surface thereof may include an inclined plane.
Figure 52 (a) is a cross-sectional view showing a light-emitting device; Figure 52 (b) is a plan view showing an insulating film provided on a metal layer in Figure 52 (a).
Referring to FIG. 52, a hole 21E is formed in a first insulating film 21 on a first metal layer 11. The hole 21E exposes the top surface of the first metal layer 11. A lead member 31 is formed on the first and second insulating films 21, 23. A portion 31E of the guide member 31 may be in contact with the first metal layer 11 via the hole 21E. One portion of the guide member 31 has a protruding shape and its width may be smaller than the width of the first insulating film 21.
If the first insulating film 21 is formed of a light transmissive material, a portion 31E of the guiding member 31 can reflect an incident light. Further, if the guide member 31 and the first metal layer 11 are formed of a metal, they may be bonded to each other to fix the first insulating film 21.
Here, if the guiding member 31 is formed of a non-metal material or a resin-based material which is not electrically conductive, one of the through holes 21E of the first insulating film 21 may be formed on the first metal layer 11 and the second metal layer 13, respectively. Except for the top surface of the boundary portion between the two metal layers 11, 13. A portion of the guide 31 may be formed in the hole 21E. The hole 21E may be formed in plural form on the first insulating film 21.
Figure 53 illustrates a plan view in accordance with an embodiment. Figure 54 is a cross-sectional view taken along line B-B of Figure 53. Figure 55 is a cross-sectional view taken along line C-C of Figure 53.
Referring to Figures 53 through 55, a resin layer 68 is formed on the entire top surface of one of the first and second metal layers 11, 13, and a light-emitting wafer 45 is molded thereon. A groove 19 is formed around the resin layer 68. The trench 19 may have a ring shape, a frame shape, or a polygonal shape, and may expose a top surface of the first metal layer 11 and be separated from the second metal layer 13. . The etching process may include a wet etching or dry etching method, and is not limited thereto.
A guide 38 can be formed in the trench 19 and can be formed from a reflective material. The guiding member 38 is disposed around the light emitting wafer 45 in a circular or polygonal shape, is in contact with the first metal layer 11, and is spaced apart from the second metal layer 13 by a predetermined distance T5. Therefore, the guide 38 may not be in contact with the lower surface 68A of the resin layer 68. Here, the lower surface 68A may be formed of a resin layer or a material of an insulating adhesive layer.
When the guide 38 is embedded in the resin layer 68, it is in contact with the top surface of the first metal layer 11 and is spaced apart from the second metal layer 13. In addition, the guides 38 may have different heights in the first metal layer 11 and the second metal layer 13. The guide 38 can reflect the light emitted by the luminescent wafer 45. This structure does not have an additional insulating film and can be easily fabricated.
A portion 68C of the resin layer 68 may be filled in a separation portion 17 between the first metal layer 11 and the second metal layer 13, or an insulating film may be bonded to the top surface and/or the lower surface of the metal layers. .
The upper portion of the guide 38 may have a width greater than the lower portion thereof. Additionally, the guide member 38 can have an inner surface that is inclined at a predetermined angle to the top surface of the metal layers 11, 13.
The features of the various embodiments are selectively applicable to other embodiments and are not limited to a single embodiment.
Here, the guiding member 38 is formed of a non-metal material or an insulating resin series material, and the groove 19 of the resin layer 68 extends to the top surfaces of the first and second metal layers 11, 13, except for the two metal layers 11 , 13 outside the junction of the top of the section. A guide 38 is formed in the groove 19.
According to an embodiment of the invention, at least one of the surface, the lower surface, and the top surface of the metal layers may have an uneven structure. The uneven structure increases the surface area of the metal layer to improve heat dissipation efficiency and adhesion to other materials.
<Light Emitting Wafer>
An illuminating wafer according to an embodiment will be described in detail below with reference to FIGS. 56 and 57.
Referring to FIG. 56, the illuminating wafer 41 may include a substrate 111, a buffer layer 112, a first conductive type semiconductor layer 113, an active layer 114, and a first layer. The second conductive semiconductor layer 115, a first electrode 116, and a second electrode. The first conductive type semiconductor layer 113, the active layer 114, and the second conductive type semiconductor layer 115 may be defined as a light emitting structure.
The substrate 111 may include an Al 2 O 3 substrate, a GaN substrate, a SiC substrate, a ZnO substrate, a Si substrate, a GaP substrate, an InP substrate, a conductive substrate, and a GaAs substrate. The substrate 111 may be a growth substrate. With InxAlyGa1-x-yN(0 x 1,0 y 1,0 x+y A semiconductor of the composition of 1) can be grown on the growth substrate.
The buffer layer 112 may be a lattice constant difference between the substrate 111 and the semiconductor, and may be formed of a II-VI compound semiconductor. An undoped III-V compound semiconductor may be further disposed on the buffer layer 112, but is not limited thereto.
The first conductive semiconductor layer 113 is disposed on the buffer layer 112, the active layer 114 is disposed on the first conductive semiconductor layer 113, and the second conductive semiconductor layer 115 is disposed on the active layer 114.
The first conductive semiconductor layer 113 may be optionally doped with a first conductive type dopant III-V compound semiconductor such as GaN, AlN, AlGaN, InGaN, InN, InAlGaN, AlInN, AlGaAs, GaP, One of a group consisting of GaAs, GaAsP, and AlGaInP is formed. When the first conductivity type is an N-type semiconductor, the first conductivity type impurity may include an N-type impurity such as Si, Ge, Sn, Se, and Te. The first conductive semiconductor layer 113 may be formed of a single layer or a plurality of layers, but is not limited thereto.
The active layer 114 may have a single quantum well structure, a multiple quantum well structure (MQW) structure, a quantum wire structure, and a quantum dot structure. ). The active layer 114 may be formed by a cycle of a well layer and a barrier layer using a III-V compound semiconductor material, such as an InGaN well layer/GaN barrier layer or an InGaN well layer/AlGaN barrier layer. Floor.
A conductive clad layer can be disposed on and/or under the active layer 114. The conductive cladding layer may be formed of an AlGaN-based material.
The second conductive semiconductor layer 115 is formed on the active layer 114, and the second conductive semiconductor layer 115 may be made of a III-V compound semiconductor material doped with a second conductive type impurity such as GaN, AlN, AlGaN, InGaN, InN. Formed by one of InAlGaN, AlInN, AlGaAs, GaP, GaAs, GaAsP, or AlGaInP. When the second conductivity type is a P-type semiconductor, the second conductivity type impurity may include a P-type impurity such as Mg or Ze. The second conductive type semiconductor layer 115 may have a single layer structure or a multilayer structure, but is not limited thereto.
Further, a third conductive type semiconductor layer, such as an N type semiconductor layer, may be formed on the second conductive type semiconductor layer 115. Therefore, the light emitting structure 135 may include one of the following: an N-P junction structure, a P-N junction structure, an N-P-N junction structure, and a P-N-P junction structure.
A current spreading layer may be formed on the second conductive type semiconductor layer 115. The current distribution layer may be indium tin oxide (ITO), indium zinc oxide (IZO), indium zinc tin oxide (IZTO), indium aluminum zinc oxide (indium aluminum zinc oxide). IAZO), indium gallium zinc oxide (IGZO), indium gallium tin oxide (IGTO), aluminum zinc oxide (AZO), antimony tin oxide (ATO) And one of gallium zinc oxide (GZO) is formed.
A first electrode 116 may be formed on the first conductive type semiconductor layer 113, and a second electrode 117 may be formed on the second conductive type semiconductor layer 115.
The first electrode 116 and the second electrode 117 may be connected to the metal layer in FIGS. 1 to 5 via a wire.
Figure 57 is a diagram showing a vertical type chip structure.
Referring to FIG. 57, in an illuminating wafer 45, an ohmic layer is formed under a light emitting structure 110; a reflective layer 124 is formed under the ohmic layer 121; and a conductive support member 125 is formed on the ohmic layer Below the reflective layer 124; and a protective layer 123 around the reflective layer 124 and the light emitting structure 110.
The light-emitting chip 45 is formed by forming an ohmic layer 121, a channel layer 123, a reflective layer 124, and a conductive support member 125 on the second conductive semiconductor layer 115, and then removing the substrate 111 and The buffer layer 112 does not need to perform an etching process for exposing the first conductive type semiconductor layer 113 in the structure shown in FIG.
The ohmic layer 121 may be in ohmic contact with a lower layer of the light emitting structure 110, such as the second conductive type semiconductor layer, and the material thereof may be one of the following: indium tin oxide (ITO), indium zinc oxide (indium) Zinc oxide, IZO), indium zinc tin oxide (IZTO), indium aluminum zinc oxide (IAZO), indium gallium zinc oxide (IGZO), indium gallium tin oxide (indium gallium tin oxide) Indium gallium tin oxide, IGTO), aluminum zinc oxide (AZO), antimony tin oxide (ATO), gallium zinc oxide (GZO), Ag, Ni, Al, Rh, Pd , Ir, Ru, Mg, Zn, Pt, Au, Hf, and combinations thereof. The ohmic layer 121 can be formed into a multilayer structure using a metal material and a light-transmitting conductive material such as IZO, IZTO, IAZO, IGZO, IGTO, AZO, and ATO. For example, the multilayer may include IZO/Ni, AZO/Ag, IZO/Ag/Ni, and AZO/Ag/Ni. A layer for blocking the current corresponding to the electrode 116 may be further formed in the ohmic layer 121.
The protective layer 123 may be indium tin oxide (ITO), indium zinc oxide (IZO), indium zinc tin oxide (IZTO), indium aluminum zinc oxide (IAZO). ), indium gallium zinc oxide (IGZO), indium gallium tin oxide (IGTO), aluminum zinc oxide (AZO), antimony tin oxide (ATO), It is formed by one of gallium zinc oxide (GZO), SiO 2 , SiOx, SiOxNy, Si 3 N 4 , Al 2 O 3 , and TiO 2 . The protective layer 123 can be formed via a sputtering method or a deposition method. The metal in the protective layer 124 prevents electrical shorting between the layers of the light emitting structure 110.
The reflective layer 124 may be formed of one of: Ag, Ni, Al, Rh, Pd, Ir, Ru, Mg, Zn, Pt, Au, Hf, and combinations thereof. The reflective layer 124 can have a width greater than the width of the light emitting structure 110 to improve light reflection efficiency.
The conductive support member 125 is a base substrate and may be made of copper (Cu), gold (Au), nickel (Ni), molybdenum (Mo), copper tungsten (Cu-W), and a carrier wafer (carrier). Wafers) are formed such as Si, Ge, GaAs, ZnO, Sic, or the like. A bonding layer may be further formed between the conductive support 125 and the reflective layer 124. The bonding layer can bond the two layers together.
The above description of the light-emitting chip is merely an example, and is not limited to the above features. The luminescent wafer can be selectively applied to embodiments of the illuminating device, but is not limited thereto.
In the above disclosed embodiments, the light emitting device comprises a light emitting chip package, and may have a light emitting chip on a substrate and be provided to an illumination system such as a light emitting module or a lighting unit. One of the light-emitting devices according to the above disclosed embodiments can be applied to a lighting system.
The light emitting device of the embodiment of the present invention can be applied to a lighting unit. The lighting unit can have a structure in which a plurality of light emitting devices or light emitting device packages are arranged. The lighting unit may include the display device illustrated in FIGS. 58 and 59 and the lighting device illustrated in FIG. Additionally, the lighting unit can include a light, a traffic light, a vehicle headlight, and a signboard.
Figure 58 is an exploded perspective view showing a display device in accordance with an embodiment of the present invention.
Referring to FIG. 58 , a display device 1000 includes a light guide plate 1041, and a light emitting module 1031 (light emitting module) for providing light to the light guide plate 1041. a reflective member 1022 (reflective member) under the light guide plate 1041; an optical sheet 1051 (optical sheet) on the light guide plate 1041; a display panel 1061 (display panel) on the optical sheet 1051; and a bottom cover 1011 The bottom cover accommodates the light guide plate 1041, the light emitting module 1031, and the reflective member 1022; however, the embodiment of the present invention is not limited thereto.
The bottom cover 1011, the reflective member 1022, the light guide plate 1041, and the optical sheet 1051 may be defined as a lighting unit 1050.
The light guide plate 1041 diffuses light to generate planar light. The light guide plate 1041 may be formed of a transparent material. For example, the light guide plate 1041 may be formed of one of acrylic resin-based materials, such as polymethylmethacrylate (PMMA), polyethylene terephthlate (polyethylene terephthlate). PET) resin, polycarbonate (PC) resin, cyclic olefin copolymer (COC) resin, and polyethylene naphthalate (PEN) resin.
The light emitting module 1031 can provide light to at least one surface of the light guide plate 1041. Therefore, the light emitting module 1031 can be used as a light source of a display device.
The at least one light emitting module 1031 can be disposed to directly or indirectly provide light on at least one surface of the light guide plate 1041. The light emitting module 1031 can include a substrate 1033 and the light emitting device package 100 according to the above embodiment. In addition, the light emitting device packages 100 may be arranged on the substrate 1033 at a predetermined distance.
The substrate 1033 can be a printed circuit board (PCB) including one of a circuit pattern (not shown). In addition, the substrate 1033 may also include a typical printed circuit board, a metal core PCB (MCPCB), a flexible printed circuit board (FPCB), and the like, but is not limited thereto. When the light emitting device package 100 is mounted on one side of the bottom cover 1011 or on a heatsink plate, the substrate 1033 can be removed in this case. Here, a portion of the heat sink may be in contact with a top surface of the bottom cover 1011.
The light emitting device packages 100 can be disposed on the substrate 1033 such that a light emitting surface through which the light from the substrate 1033 can pass can be spaced apart from the light guide plate 1041 by a predetermined distance; Not limited to this. The light emitting device package 100 can directly or indirectly provide light to a light incident surface, that is, one side of the light guide plate 1041; but is not limited thereto.
The reflective member 1022 can be disposed under the light guide plate 1041. Since the reflecting member 1022 reflects the light incident to the lower surface of one of the light guide plates 1041 to provide upward light, the brightness of the illumination unit 1050 can be improved. For example, the reflective member 1022 may be formed of one of polyethylene terephthalate (PET), polycarbonate (PC), and polyvinyl chloride (PVC), but is not limited thereto. The reflective member 1022 can be the top surface of the bottom cover 1011, but is not limited thereto.
The bottom cover 1011 can accommodate the light guide plate 1041, the light emitting module 1031, and the reflective member 1022. To this end, the bottom cover 1011 may include a receiving portion 1012 having a box shape in which the upper side is open; however, it is not limited thereto. The bottom cover 1011 can be coupled to a top cover, but is not limited thereto.
The bottom cover 1011 may be formed of a metal material or a resin material. In addition, the bottom cover 1011 can be manufactured by a press molding process or an extrusion molding process. The bottom cover 1011 may be formed of a metal or non-metal material having excellent thermal conductivity, but is not limited thereto.
For example, the display panel 1061 can be an LCD panel, and includes first and second substrates formed by a transparent material and facing each other, and a liquid crystal between the first and the second substrate. Liquid crystal layer. A polarizing plate may be coupled to at least one surface of the display panel 1061. The present invention is not limited to the above-described connection structure of the polarizing plate. The display panel 1061 displays information using light passing through the optical sheet 1051. The display device 1000 can be applied to a variety of different portable terminals, notebook screens, computer screens, and television screens.
The optical sheet 1051 is disposed between the display panel 1061 and the light guide plate 1041 and includes at least one light-transmitting sheet. For example, the optical sheet 1051 may include at least one of a diffusion sheet, a horizontal and vertical prism sheet, a brightness enhanced sheet, and the like. The diffuser diffuses incident light. The horizontal and/or vertical ridges concentrate the incident light onto a display area. In addition, the brightness enhancement sheet can reuse the lost light to enhance brightness. In addition, a protective sheet may be disposed on the display panel 1061, but is not limited thereto.
Here, optical components such as the light guide plate 1041 and the optical sheet 1051 may be disposed on one of the light paths of the light emitting module 1031, but are not limited thereto.
Figure 59 is a diagram showing a display device in accordance with an embodiment of the present invention.
Referring to FIG. 59, a display device 1100 includes a bottom cover 1152, a substrate 1120 having the above-described light emitting device package 100 disposed thereon, an optical component 1154, and a display panel 1155.
The substrate 1120 and the light emitting device package 100 can be defined as a light emitting module 1060. The bottom cover 1152, the at least one light emitting module 1060, and the optical component 1154 can be defined as a lighting unit.
The bottom cover 1152 may include a receiving portion 1153 (receiving part), but is not limited thereto.
Here, the optical component 1154 may include at least one of: a lens, a light guide plate, a diffusion sheet, horizontal and vertical cymbals, and a brightness enhancement sheet. The light guide plate may be formed of a PC material or a PMMA material. In this case, the light guide plate can be removed. The diffuser diffuses the incident light, and the horizontal and vertical patches concentrate the incident light to a display area. The brightness enhancement sheet can reuse the lost light to improve brightness.
The optical component 1154 is disposed on the light emitting module 1060 to generate planar light by using the light emitted by the light emitting module 1060, or to diffuse and collect the light emitted by the light emitting module 1060.
Figure 60 is a perspective view of a lighting device in accordance with an embodiment of the present invention.
Referring to FIG. 60, a lighting unit 1500 can include a housing 1510, a lighting module 1530 disposed in the housing 1510, and a connection terminal 1520 disposed in the housing 1510 for receiving an external power source. Electricity.
Preferably, the outer casing 1510 may be made of a material having excellent heat dissipation properties, such as a metallic material or a resin material.
The light emitting module 1530 can include a substrate 1532 and a light emitting device package 100 mounted on the substrate 1532. The light emitting device packages 100 may be provided in a plurality of forms, and the light emitting device packages 100 may be arranged in a matrix form or spaced apart from each other by a predetermined distance.
The substrate 1532 may be an insulator on which a circuit pattern is printed. For example, the substrate can include a printed circuit board (PCB), a metal core printed circuit board (MCPCB), a flexible printed circuit board (FPCB), a ceramic circuit board, or an FR-4 substrate, and the like.
In addition, the substrate 1532 may also be formed of a material capable of effectively reflecting light, and one surface thereof is formed by a color capable of effectively reflecting light. For example, the substrate 1532 can be a coating having one of white or silver.
At least one light emitting device package 100 can be mounted on the substrate 1532. Each of the light emitting device packages 100 can include at least one light emitting diode (LED) wafer. The light emitting diode chip may include a color light emitting diode that emits red, green, blue, or white light, or an ultraviolet (UV) light emitting diode that emits ultraviolet light.
The light emitting module 1530 can have different combinations of light emitting device packages 100 to achieve a desired color and brightness. For example, the light emitting module 1530 can have a combination of a white light emitting diode, a red light emitting diode, and a green light emitting diode to obtain a high color rendering index (CRI).
The connection terminal 1520 can be electrically connected to the light emitting module 1530 to provide power. The connection terminal 1520 may be a socket type, which is screw-coupled, but is not limited thereto. For example, the connection terminal 1520 can be in a pin type to insert the connection terminal 1520 into the external power source, or can be connected to the external power source by a wire.
Embodiments of the present invention provide a piece of tape type or film type illumination device.
Embodiments of the present invention provide a light emitting device that supports a metal layer via an insulating film rather than a package. Embodiments of the present invention can improve the manufacturing process of a light emitting device. Embodiments of the invention can reduce the thickness of the illumination device. Embodiments of the present invention can improve miniaturization and integration of illuminating devices. Embodiments of the present invention can improve the heat dissipation efficiency of a lighting device and an illumination system including the lighting device.
The specific features, structures, or advantages mentioned in the above embodiments are included in at least one embodiment of the invention, and are not limited to an embodiment. In addition, in the description of a particular feature, structure, or function, it is contemplated that the other embodiments are utilized to implement other embodiments. Therefore, such reorganization or modification is considered to fall within the scope of the application of the present invention.
While the embodiments have been described with reference to the embodiments of the embodiments of the invention, it is understood that More particularly, various variations and modifications are possible in the component parts and/or arrangements of the claimed combinations.
10, 11, 13, 15. . . Metal layer
11-1, 13-1. . . Inner part
11-2, 13-2. . . Outer part
11A, 11B, 11C. . . Metal layer
11D, 13D. . . Irregular structure
11E, 13E. . . Uneven structure
13A. . . Second metal layer
13B. . . Third metal layer
17, 17A, 17B. . . Separation department
18. . . Separator
19. . . Trench
20, 21, 23. . . Insulating film
21d, 31d. . . Inclined plane
21E. . . Hole
twenty two. . . Third insulating film
23A, 23B. . . Second insulating film
twenty four. . . Insulating adhesive film
24A. . . Second insulating film
24B. . . Third insulating film
25. . . Insulating film
29. . . Adhesive layer
31, 32, 38. . . Guide
31E. . . section
31C, 34, 36, 37C. . . Second guide
37A, 37B. . . Third guide
41, 42, 43, 45. . . Light emitting chip
41A, 41B. . . Light emitting chip
51, 52, 53, 54. . . wire
61. . . Resin layer
61A. . . section
62, 63. . . Resin layer
63A. . . Rough surface
63B. . . Depression
66, 67. . . Resin layer
67A. . . Central part
67B. . . Outer part
68. . . Resin layer
68A. . . lower surface
68C. . . section
71. . . lens
72. . . Reflective material
73. . . Fluorescent layer
81A, 81B. . . Reflective layer
110. . . Light structure
112. . . The buffer layer
113. . . Conductive semiconductor layer
114. . . Active layer
115. . . Conductive semiconductor layer
116. . . electrode
117. . . Second electrode
121. . . Ohmic layer
123. . . The protective layer
124. . . Reflective layer
125. . . Conductive support
1000. . . Display device
1011. . . Bottom cover
1012. . . Housing part
1022. . . Reflective part
1031. . . Light module
1033. . . Substrate
1041. . . Light guide
1050. . . Lighting unit
1051. . . Optical sheet
1152. . . Bottom cover
1153. . . Housing
1154. . . Optical component
1155, 1061. . . Display panel
1060. . . Light module
1100. . . Display device
1500. . . Light unit
1510. . . shell
1520. . . Connection terminal
1530. . . Light module
1532. . . Substrate
A1, A2, A3. . . Open area
B1. . . Outer partial area
B2. . . Inner partial area
B3. . . region
C1. . . Chamber
D1, D2. . . length
D3. . . Predetermined distance
G1. . . spacing
L1, L2. . . length
S1. . . surface
S3. . . lower surface
T1, T2, T3, T4, T5, T6. . . thickness
W1, W2, W5, W6. . . width
X1. . . length
X2, X3, X4. . . First direction width
Y1. . . length
Y4. . . Second direction width
1 is a cross-sectional view showing a light emitting device according to a first embodiment;
2 to FIG. 4 are diagrams showing another example of the light emitting device of FIG. 1;
Figure 5 is a perspective view of a light emitting device according to a second embodiment;
Figure 6 is a cross-sectional view taken along line A-A of Figure 5;
7 to FIG. 14 are diagrams showing a manufacturing process of the light emitting device of FIG. 5;
Figure 15 is a cross-sectional view showing a light-emitting device according to a third embodiment;
Figure 16 is a cross-sectional view showing a light-emitting device according to a fourth embodiment;
17 and FIG. 18 are a perspective view and a cross-sectional view showing a light-emitting device according to a fifth embodiment;
19 and FIG. 20 are a plan view and a cross-sectional view showing a light-emitting device according to a sixth embodiment;
21 is another modified example of FIG. 19;
22 to 31 illustrate a modified example of an insulating film and a metal layer according to an embodiment of the invention;
32 to 55 are diagrams showing a modified example of a light-emitting device according to other embodiments of the present invention;
Figure 56 and Figure 57 are diagrams showing an example of a light-emitting chip according to an embodiment of the invention;
Figure 58 is a perspective view showing an example of a display device according to an embodiment of the invention;
Figure 59 is a perspective view showing an example of another display device according to an embodiment of the present invention;
Figure 60 is a perspective view of a lighting unit, in accordance with an embodiment of the present invention.
11,13. . . Metal layer
17. . . Separation department
21, 23. . . Insulating film
31. . . Guide
41. . . Light emitting chip
51, 52. . . wire
T4, T5. . . thickness
A light-emitting device includes: a plurality of metal layers are spaced apart from each other; a first insulating film is disposed on an outer portion of one of the top surface regions of the metal layers, and has an open region to enable the metal layers One of the top surface regions is partially open; a second insulating film is on at least one of a lower surface and an upper surface of the metal layers; the second insulating film corresponds to the metal layers, and the second The width of the two insulating films is greater than the width of one of the metal layers; a second guiding member is disposed on the second insulating film; and an illuminating chip is disposed on at least one of the metal layers, and the metal The other of the layers is electrically connected; and a resin layer is disposed on the metal layer and the luminescent wafer, wherein the metal layers comprise an inner portion and an outer portion, and the outer portion has a thickness greater than the inner portion The thickness of the part.
The illuminating device of claim 1, wherein a first guiding member is disposed on at least one of the first insulating film and the top surfaces of the metal layers.
The illuminating device of claim 2, wherein the first guiding member is disposed around the resin layer.
The illuminating device of claim 1, further comprising an adhesive The layer is between the metal layers and the first insulating film and the second insulating film.
A light-emitting device comprising: a plurality of metal layers spaced apart from each other; a first insulating film having an open region, wherein one of the top surface regions of the metal layers is partially open thereto, and is disposed at the a top surface of the metal layer; an adhesive layer between the metal layers and the first insulating film; a second insulating film on the top surface of the metal layers corresponding to the metal layers, and the The width of the second insulating film is greater than the width of one of the metal layers; an illuminating chip is disposed on at least one of the metal layers; a resin layer is disposed on the metal layer and the luminescent wafer; a guiding member is disposed on a top surface of the first insulating film, and a second guiding member is disposed on the second insulating film, wherein the metal layers have a chamber structure, and one of the chamber structures is Some parts are deeper than the outer part.
The illuminating device of claim 1 or 5, wherein the first insulating film is disposed on an outer portion of the top surface region of the metal layers.
The illuminating device of claim 1 or 5, wherein the first insulating film is disposed on a peripheral portion of the top surface of the metal layers.
The illuminating device of claim 1 or 5, wherein the first The insulating film includes at least one selected from the group consisting of a loop shape, a ring shape, and a frame shape.
The light-emitting device of claim 1, wherein the first insulating film and the second insulating film are connected to each other.
The illuminating device of claim 1 or 5, wherein the first insulating film and the second insulating film comprise a light transmissive film or a fluorescent film.
The illuminating device of claim 1 or 5, wherein the first insulating film and the second insulating film comprise a film selected from the group consisting of a polyimide (PI) film and a polyethylene terephthalate. Polyethylene terephthlate (PET) film, ethylene vinyl acetate (EVA) film, polyethylene naphthalate (PEN) film, triacetyl cellulose, TAC) membrane, a polyimide imide (PAI) membrane, a polyether ether ketone (PEEK) membrane, a perfluoroalkoxy (PFA) membrane, a polyphenylene sulfide At least one of a group consisting of a polyphenylene sulfide (PPS) film and a resin film.
The illuminating device of claim 2, wherein the first guiding member and the second guiding member are connected to each other.
The illuminating device of claim 2 or 5, wherein the first guiding member The width of the second guiding member is smaller than the width of the first insulating film and the second insulating film.
The illuminating device of claim 2, wherein the first guiding member and the second guiding member comprise a group selected from the group consisting of a resin material, a non-metal material, and a reflective metal. At least one.
The illuminating device of claim 2, wherein the first guiding member and the second guiding member are selected from the group consisting of an anti-solder, a solder paste, Ag, Al, Cu, Au, Ag alloy, At least one of the group consisting of an Al alloy, a Cu alloy, and an Au alloy.
The illuminating device according to any one of claims 1 to 5, wherein the lower surfaces of the metal layers are disposed on the same plane.
The illuminating device according to any one of claims 1 to 5, wherein a top surface of the outer portions of the metal layers is disposed at a top surface of one of the inner portions of the metal layers.
The illuminating device according to any one of claims 1 to 5, wherein a thickness of one of the inner portions of the metal layers is in a range of about 15 μm to about 300 μm.
The illuminating device according to any one of claims 1 to 5, further comprising an inclined plane facing each other between an outer portion and an inner portion of a top side region of the metal layers.
The illuminating device of claim 2, wherein at least one of the first insulating film and the inner surface of the first guiding member is formed on an inclined plane.
The illuminating device of any one of the preceding claims, wherein the metal layer comprises a first metal layer and a second metal layer, and the light emitting chip is disposed on the first metal On the floor.
The illuminating device of any one of claims 1 to 5, wherein the metal layer comprises a first metal layer, a second metal layer, and a third metal layer on the first metal Between the layer and the second metal layer; the light-emitting chip is disposed on the third metal layer and electrically connected to the first metal layer and the second metal layer.
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US20110303941A1 (en) 2011-12-15
EP2330638B1 (en) 2019-03-27 Light emitting device
TWI440215B (en) 2014-06-01 A light emitting device and method thereof