WO2005057672A2 - Surface mount light emitting chip package - Google Patents
Surface mount light emitting chip package Download PDFInfo
- Publication number
- WO2005057672A2 WO2005057672A2 PCT/US2004/041392 US2004041392W WO2005057672A2 WO 2005057672 A2 WO2005057672 A2 WO 2005057672A2 US 2004041392 W US2004041392 W US 2004041392W WO 2005057672 A2 WO2005057672 A2 WO 2005057672A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light emitting
- chip
- chip carrier
- set forth
- principal surface
- Prior art date
Links
- 239000008393 encapsulating agent Substances 0.000 claims description 23
- 239000004020 conductor Substances 0.000 claims description 14
- 229910000679 solder Inorganic materials 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 239000004593 Epoxy Substances 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims 2
- 230000001105 regulatory effect Effects 0.000 claims 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 14
- 238000000034 method Methods 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000005476 soldering Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000004075 alteration Effects 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 239000012777 electrically insulating material Substances 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000011112 process operation Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000004100 electronic packaging Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000001883 metal evaporation Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000001721 transfer moulding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/64—Heat extraction or cooling elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/62—Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/4805—Shape
- H01L2224/4809—Loop shape
- H01L2224/48091—Arched
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
- H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
- H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
- H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
- H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/102—Material of the semiconductor or solid state bodies
- H01L2924/1025—Semiconducting materials
- H01L2924/10251—Elemental semiconductors, i.e. Group IV
- H01L2924/10253—Silicon [Si]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/11—Device type
- H01L2924/12—Passive devices, e.g. 2 terminal devices
- H01L2924/1204—Optical Diode
- H01L2924/12041—LED
Definitions
- the following relates to the lighting arts. It is especially relates to surface-mounted light emitting diodes for indicator lights, illumination applications, and the like, and will be described with particular reference thereto. However, the following will also find application in other areas that advantageously can employ surface-mountable light emitting devices.
- Surface mounted light emitting packages typically employ a light emitting chip such as a light emitting diode chip, a vertical cavity surface emitting laser, or the like. In some arrangements the chip is bonded to a thermally conductive sub-mount which is in turn bonded to a lead frame.
- the sub-mount provides various benefits such as improving manufacturability of electrical interconnections, improving thermal contact and conduction, and the like.
- the lead frame is adapted to be surface mounted by soldering to a printed circuit board or other support.
- the thermal transfer path includes two intervening elements, namely the sub-mount and the lead frame.
- electrical connections to the lead frame typically involve wire bonds, which can be fragile.
- the mechanical connection between the sub-mount and the lead frame is typically effected in part by an epoxy or other type of encapsulating overmolding material. Such materials can have relatively high coefficients of thermal expansion which can stress wire bonds or mechanical connections.
- the present invention contemplates an improved apparatus and method that overcomes the above-mentioned limitations and others.
- a light emitting package includes top and bottom principal surfaces. At least one light emitting chip is attached to the top principal surface of the chip carrier. A lead frame attached to the top principal surface of the chip carrier. According to another aspect, a light emitter is disclosed. A chip carrier has top and bottom principal surfaces. At least one light emitting chip is attached to the top principal surface of the chip carrier. A lead frame electrically contacts electrodes of the at least one light emitting chip. A support including printed circuitry is provided. The lead frame electrically contacts the printed circuitry. The chip carrier is secured to the support without the lead frame intervening therebetween. According to yet another aspect, a light emitting package comprises a chip carrier and a light emitting chip attached to the chip carrier.
- a light emitting package comprises a light emitting chip and a lead frame electrically connected to electrodes of the light emitting chip.
- FIGURE 1 shows a side view of a light emitting package surface mounted to a printed circuit board.
- FIGURES 2A and 2B show top and side views of another light emitting package.
- FIGURE 3 shows a top view of yet another light emitting package.
- FIGURES 4A, 4B, and 4C show, respectively, a top view of a chip carrier with four light emitting chips flip-chip bonded thereto, a top view of a lead frame, and a side view of a light emitting package constructed from the components of FIGURES 4A and 4B.
- FIGURES 5A, 5B, and 5C show, respectively, a top view of a chip carrier with four light emitting chips bonded thereto with a front-side electrode of each chip wire bonded to the chip carrier, a top view of a lead frame, and a side view of a light emitting package constructed from the components of FIGURES 5A and 5B.
- a surface-mounted light emitting package 10 includes a light emitting chip 12, such as a light emitting diode, a resonant cavity light emitting diode, a vertical cavity surface emitting laser, or the like, bonded to an electrically insulating chip carrier 14.
- a flip-chip bonding configuration is shown in which front-side electrodes of the light emitting chip 12 are bonded to electrically conductive layers 20, 22 disposed on a top principal surface 26 of the chip carrier 14.
- An insulating gap 28 which may be an air gap or may be filled with an electrically insulating material such as an epoxy or other dielectric.
- the electrically conductive layers 20, 22 define first and second terminals of opposite electrical polarity.
- Flip-chip electrode bonds 32, 34 can be thermosonic bonds, conductive epoxy bonds, solder bonds, or the like.
- the chip carrier 14 is preferably substantially thermally conductive. At least the top principal surface 26 of the chip carrier 14 is substantially electrically insulating.
- the chip carrier 14 can be made of an electrically insulating material such as semi-insulating silicon, a ceramic, or a thermally conductive but electrically insulating plastic. Alternatively, the chip carrier 14 can be made of an electrically conductive material with an insulating layer or coating applied at least to the top principal surface 26.
- the chip carrier 14 can be made of conductive silicon with a silicon dioxide layer disposed on the top principal surface 26, or the chip carrier 14 can be made of a metal with an insulator disposed on the top principal surface 26, or so forth.
- the electrically conductive layers 20, 22 extend away from the die attach region where the light emitting chip 12 is flip chip bonded.
- Lead frame elements 40, 42 which are electrically conductive and electrically isolated from one another, are secured to and electrically contact portions of the electrically conductive layers 20, 22 distal from the die attach region.
- the lead frame 40, 42 is attached to the top principal surface 26 of the chip carrier 14.
- the lead frame element 40 includes an electrical lead 46 distal from the chip carrier 14 and a bend 48 such that the lead 46 is approximately coplanar with a bottom principal surface 50 of the chip carrier 14.
- the lead frame element 42 includes an electrical lead 52 distal from the chip carrier 14 and a bend 54 such that the lead 52 is approximately coplanar with the bottom principal surface 50 of the chip carrier 14. Electrical and physical bonding of the lead frame elements 40, 42 to the top principal surface 26 of the chip carrier 14 is suitably achieved by solder bonds 54, 56.
- the lead frame 40, 42 is suitably made of copper or another highly conductive material.
- An overmolding or encapsulant 60 is disposed over the light emitting chip 12 and the top principal surface 26 of the chip carrier 14, and also encapsulates a portion of the lead frame elements 40, 42 proximate to the chip carrier 14.
- the leads 46, 52 of the lead frame 40, 42 as well as the bottom principal surface 50 of the chip carrier 14 extend outside of the encapsulant 60.
- a wavelength-converting phosphor layer 62 coats the encapsulant 60 and fluorescently or phosphorescently converts light emitted by the light emitting chip 12 to another wavelength or range or plurality of wavelengths.
- the printed circuit board 70 includes a metal board 72, such as a copper or aluminum board, with an insulating coating 74 disposed on the metal board 72.
- Printed traces are disposed on the insulating coating 74 and define a selected electrical circuit or circuits including electrical terminals, bonding bumps, or bonding pads 80, 82.
- the lead 46 of the lead frame element 40 is soldered to the printed circuitry electrical terminal 80, while the lead 52 of the lead frame element 42 is soldered to the printed circuitry electrical terminal 82.
- the printed traces also includes a thermal terminal 84 which optionally is not connected with the electrical circuitry.
- the bottom principal surface 50 of the chip carrier 14 is preferably soldered or otherwise bonded to the thermal terminal 84 to provide a substantially thermally conductive pathway therebetween, so that heat generated in the light emitting chip 12 can conduct through the substantially thermally conductive chip carrier 14 to the thermal terminal 84 and thence to the printed circuit board 70.
- the bottom principal surface 50 of the chip carrier 14 includes a metal layer for solder attach to the board or other coating to enhance thermal contact and heat transfer.
- the attachment bonding the leads 46, 52 to the terminals 80, 82 and the attachment bonding the bottom principal surface 50 of the chip carrier 14 to the thermal terminal 84 are the same.
- these attachments can all be made by solder bonds in a single bonding process.
- a different type of attachment is used for bonding the bottom principal surface 50 of the chip carrier 14 to the thermal terminal 84 as compared with the type of attachment used for bonding the leads 46, 52 to the terminals 80, 82.
- the thermal attachment of the chip carrier 14 and the electrical attachments of the leads 46, 52 can be separately optimized for thermal and electrical conductance, respectively.
- FIGURES 2A and 2B show top and side views of a light emitting package 110.
- the package 110 is similar to the package 10 of FIGURE 1. Elements of the light emitting package 110 that correspond with elements of the package 10 are labeled by reference numbers offset by 100.
- the package 110 includes a light emitting chip 112 flip chip bonded to conductive layers 120, 122 disposed on a top principal surface 126 of a chip carrier 114.
- a gap 128 electrically isolates the conductive layers 120, 122.
- Lead frame elements 140, 142 are soldered or otherwise electrically contacted and mechanically bonded with the conductive layers 120, 122 disposed on the top principal surface 126 of the chip carrier 114.
- the lead frame elements 140, 142 each include a bend 148, 154 so that electrical leads 146, 152 distal from the chip carrier 14 are approximately coplanar with a bottom principal surface 150 of the chip carrier 114.
- the top principal surface 126 of the chip carrier 114 is electrically insulating, while the chip carrier 114 can be either electrically insulating, or electrically conductive with an insulator layer providing the electrically insulating top principal surface 126.
- the chip carrier 114 is also preferably substantially thermally conductive.
- the lead frame 140, 142 is electrically conductive, and is suitably made of copper or another metal.
- the package 110 as illustrated does not include an encapsulant or phosphor; however, these components are optionally added.
- the light emitting package 110 does not include wire bonds. Rather, electrical connection between the lead frame 140, 142 and the light emitting chip 112 is through the conductive layers 120, 122.
- the conductive layers 120, 122 are large area layers, providing good conductance even if the thicknesses of the conductive layers 120, 122 is limited.
- the conductive layers 120, 122 can be reflective layers that reflectively increase light extraction.
- the light emitting package 110 is suitable for surface mounting on a printed circuit board or other substrate.
- a light emitting package 210 is described.
- the package 210 is similar to the package 10 of FIGURE 1. Elements of the light emitting package 210 that correspond with elements of the package 10 are labeled by reference numbers offset by 200.
- the package 210 includes a light emitting chip 212 bonded to a conductive layer 220 disposed on a top principal surface of a chip carrier 214.
- the light emitting chip 212 is not flip-chip bonded. Rather, the light emitting chip 212 is bonded in a non-inverted configuration and includes an electrically conductive backside serving as an electrode that is electrically bonded to the conductive layer 220 using thermosonic bonding, conductive epoxy, solder, or the like.
- the front-side electrode of the light emitting chip 212 is wire bonded to another conductive layer 222 separated from the conductive layer 220 by a gap 228.
- the wire bond 290 reaches across the gap 228 to electrically connect a front-side electrode 292 of the light emitting chip 212 with the conductive layer 222.
- Lead frame elements 240, 242 are soldered or otherwise electrically contacted and mechanically bonded with the conductive layers 220, 222 disposed on the top principal surface of the chip carrier 214. Similarly to the corresponding lead frame elements of the packages 10, 110, the lead frame elements 240, 242 each include a bend 248, 254 so that electrical leads 246, 252 are approximately coplanar with a bottom principal surface of the chip carrier 214. Similarly to the package 10, an encapsulant 260 encapsulates the light emitting chip 212, the wire bond 290, the top principal surface of the chip carrier 214, and portions of the lead frame elements 240, 242, while the leads 246, 252 and the bottom principal surface of the chip carrier 214 extend outside of the encapsulant 260.
- the light emitting package 210 includes a phosphor coating 262. While phosphor-coated encapsulants are shown in FIGURES 1 and 3, it is to be appreciated that encapsulation without a phosphor can be employed instead, or the phosphor can be dispersed in the encapsulant, or the phosphor can be otherwise arranged to interact with light produced by the light emitting chip. Moreover, it is contemplated to include a phosphor layer without an encapsulant, or to include neither an encapsulant nor phosphor, as shown in FIGURE 2. With reference to FIGURES 4A, 4B, and 4C, a light emitting package 310 is described. The package 310 is similar to the package 10 of FIGURE 1.
- the package 310 includes four light emitting chips 312A, 312B, 312C, 312D flip-chip bonded to conductive layers 320, 322, 324 disposed on a top principal surface of a chip carrier 314.
- the conductive layers 320, 322, 324 are arranged with the layer 324 disposed between the layers 320, 322 and acting as a series interconnect terminal.
- the conductive layers 320, 324 are separated by a gap 328, while the conductive layers 322, 324 are separated by a gap 330.
- the light emitting chips 312A, 312B are flip chip bonded across the gap 328 with electrodes bonding to the conductive layers 320, 324, while the light emitting chips 312C, 312D are flip chip bonded across the gap 330 with electrodes bonding to the conductive layers 322, 324.
- the light emitting chips 312A, 312B are connected electrically in parallel with each other, and similarly the light emitting chips 312C, 312D are connected electrically in parallel with each other.
- the parallel combination of chips 312A, 312B is connected electrically in series with the parallel combination of chips 312C, 312D via the series interconnect terminal conductive layer 324.
- Lead frame elements 340, 342 are soldered or otherwise electrically contacted and mechanically bonded with the conductive layers 320, 322 disposed on the top principal surface of the chip carrier 314.
- the lead frame elements 340, 342 each include a bend 348, 354 so that electrical leads 346, 352 are approximately coplanar with a bottom principal surface of the chip carrier 314, so that the light emitting chip package 310 can be surface mounted by soldering or otherwise connecting the leads 346, 352 of the lead frame elements 340, 342 to a printed circuit board or other support.
- the surface mounting also includes forming a solder bond or other thermal contact between the bottom principal surface of the chip carrier 314 and the printed circuit board or other support.
- a solder bond or other thermal contact between the bottom principal surface of the chip carrier 314 and the printed circuit board or other support.
- the light emitting chips 312B, 312D are replaced by zener diodes connected across the gaps 328, 330, respectively. The zener diodes provide electrostatic discharge protection for the light emitting chips 312A, 312C.
- other electronic components can be similarly added along with interconnecting circuitry defined by conductive areas on the top principal surface of the chip carrier 314.
- a light emitting package 410 is described.
- the package 410 is similar to the package 310 of FIGURES 4A, 4B, and 4C. Elements of the light emitting package 410 that correspond with elements of the package 310 are labeled by reference numbers offset by 100.
- the package 410 includes four light emitting chip 412A, 412B, 412C, 412D electrically connected with conductive layers 420, 422, 424 disposed on a top principal surface of a chip carrier 414.
- the conductive layers 420, 422, 424 are arranged with the layer 424 disposed between the layers 420, 422 and acting as a series interconnect terminal.
- the conductive layers 420, 424 are separated by a gap 428, while the conductive layers 422, 424 are separated by a gap 430.
- the light emitting chips 412A, 412B are arranged in a non-inverted orientation with an electrically conductive backside of each chip serving as an electrode bonded to the conductive layer 420.
- the light emitting chips 412C, 412D are arranged in a non-inverted orientation with an electrically conductive backside of each chip serving as an electrode bonded to the conductive layer 424.
- a front-side electrode of the light emitting chip 412A is wire bonded across the gap 428 to the conductive layer 424 by a wire bond 490 A.
- a front-side electrode of the light emitting chip 412B is wire bonded across the gap 428 to the conductive layer 424 by a wire bond 490B.
- a front-side electrode of the light emitting chip 412C is wire bonded across the gap 430 to the conductive layer 422 by a wire bond 490C.
- a front-side electrode of the light emitting chip 412D is wire bonded across the gap 430 to the conductive layer 422 by a wire bond 490D.
- the light emitting chips 412A, 412B are connected electrically in parallel with each other, and similarly the light emitting chips 412C, 412D are connected electrically in parallel with each other.
- the parallel combination of chips 412A, 412B is connected electrically in series with the parallel combination of chips 412C, 412D via the series interconnect terminal conductive layer 424.
- Lead frame elements 440, 442 are soldered or otherwise electrically contacted and bonded with the conductive layers 420, 422 disposed on the top principal surface of the chip carrier 414.
- the lead frame elements 440, 442 each include a bend 448, 454 so that electrical leads 446, 452 are approximately coplanar with a bottom principal surface of the chip carrier 414, so that the light emitting chip package 410 can be surface mounted by soldering or otherwise connecting the leads 446, 452 to a printed circuit board or other support.
- the surface mounting also includes forming a solder bond or other thermal contact between the bottom principal surface of the chip carrier 414 and the printed circuit board or other support.
- a single wire bond is used to electrically connect a frontside electrode of each chip, with the second electrode of each chip corresponding to the electrically conductive backside of the chip.
- an insulating backside and two front side contacts that are each wire bonded to one of the conductive films disposed on the front principal surface of the chip carrier.
- the light emitting packages described herein are suitably constructed using electronic packaging processes.
- One example process is as follows. The process preferably starts with a chip carrier wafer which will be diced to produce a large number of light emitting packages each including a chip carrier diced from the chip carrier wafer.
- the chip carrier is electrically conductive, it is preferably coated, oxidized, or otherwise processed to form an electrically insulating layer at least on the top principal surface.
- Two or more patterned conductive layers are formed on the top principal surface of the chip carrier using metal evaporation, electroplating, or the like in conjunction with lithographic techniques that define the electrically isolating gaps between the conductive layers.
- These patterned conductive layers are the electrical terminal conductive layers, such as the layers 20, 22 of the package of FIGURE 1.
- the bottom principal surface of the chip carrier is also metallized to allow for solder attach to improve thermal conductivity through the bottom principal surface.
- the light emitting chips are attached mechanically and electrically to the chip carriers by flip-chip bonding, wire bonding, or the like.
- the chip carrier wafer is then diced to produce a plurality of chip carriers with attached light emitting chips.
- Each chip carrier produced by the dicing is processed in the example process as follows.
- the top principal surface of the chip carrier is soldered to the lead frame.
- the two lead frame elements are secured together by tabs or other fasteners during this soldering, and in one embodiment a number of such lead frames are secured together in a linear or two-dimensional array to facilitate automated processing.
- a transfer molding process is used to form the encapsulant over the light emitting chips, the top principal surface of the chip carrier, and portions of the lead frame.
- the molding die is designed so that the leads and the bottom principal surface of the chip carrier extend outside the molded encapsulant.
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Led Device Packages (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04813682A EP1700350A2 (en) | 2003-12-09 | 2004-12-09 | Surface mount light emitting chip package |
KR1020067013794A KR101311635B1 (en) | 2003-12-09 | 2004-12-09 | Surface mount light emitting chip package |
US10/582,377 US20080035947A1 (en) | 2003-12-09 | 2004-12-09 | Surface Mount Light Emitting Chip Package |
JP2006544014A JP5349755B2 (en) | 2003-12-09 | 2004-12-09 | Surface mount light emitting chip package |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US52796903P | 2003-12-09 | 2003-12-09 | |
US60/527,969 | 2003-12-09 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2005057672A2 true WO2005057672A2 (en) | 2005-06-23 |
WO2005057672A3 WO2005057672A3 (en) | 2006-04-06 |
Family
ID=34676803
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2004/041392 WO2005057672A2 (en) | 2003-12-09 | 2004-12-09 | Surface mount light emitting chip package |
Country Status (6)
Country | Link |
---|---|
US (1) | US20080035947A1 (en) |
EP (1) | EP1700350A2 (en) |
JP (1) | JP5349755B2 (en) |
KR (1) | KR101311635B1 (en) |
CN (1) | CN1961431A (en) |
WO (1) | WO2005057672A2 (en) |
Cited By (13)
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EP1605525A2 (en) * | 2004-06-10 | 2005-12-14 | LG Electronics Inc. | High power LED package |
US20070001564A1 (en) * | 2005-06-30 | 2007-01-04 | Lg.Philips Lcd Co., Ltd. | Light emitting diode package in backlight unit for liquid crystal display device |
JP2007116138A (en) * | 2005-09-22 | 2007-05-10 | Lexedis Lighting Gmbh | Light emitting device |
JP2007129188A (en) * | 2005-10-07 | 2007-05-24 | Hitachi Maxell Ltd | Semiconductor device, semiconductor module, and method of manufacturing the semiconductor module |
JP2007142278A (en) * | 2005-11-21 | 2007-06-07 | Matsushita Electric Works Ltd | Light emitting device and its manufacturing method |
JP2007142280A (en) * | 2005-11-21 | 2007-06-07 | Matsushita Electric Works Ltd | Light-emitting apparatus and manufacturing method thereof |
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US7842960B2 (en) | 2006-09-06 | 2010-11-30 | Lumination Llc | Light emitting packages and methods of making same |
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US9841175B2 (en) | 2012-05-04 | 2017-12-12 | GE Lighting Solutions, LLC | Optics system for solid state lighting apparatus |
US9951938B2 (en) | 2009-10-02 | 2018-04-24 | GE Lighting Solutions, LLC | LED lamp |
US10340424B2 (en) | 2002-08-30 | 2019-07-02 | GE Lighting Solutions, LLC | Light emitting diode component |
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JP2007201420A (en) * | 2005-12-27 | 2007-08-09 | Sharp Corp | Semiconductor light-emitting device, semiconductor light-emitting element, and method of manufacturing semiconductor light-emitting device |
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Also Published As
Publication number | Publication date |
---|---|
US20080035947A1 (en) | 2008-02-14 |
KR101311635B1 (en) | 2013-09-26 |
JP2007514320A (en) | 2007-05-31 |
KR20060134969A (en) | 2006-12-28 |
EP1700350A2 (en) | 2006-09-13 |
JP5349755B2 (en) | 2013-11-20 |
CN1961431A (en) | 2007-05-09 |
WO2005057672A3 (en) | 2006-04-06 |
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