CN100559583C - The LED assembly - Google Patents
The LED assembly Download PDFInfo
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- CN100559583C CN100559583C CN 200710184957 CN200710184957A CN100559583C CN 100559583 C CN100559583 C CN 100559583C CN 200710184957 CN200710184957 CN 200710184957 CN 200710184957 A CN200710184957 A CN 200710184957A CN 100559583 C CN100559583 C CN 100559583C
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- 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
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
Abstract
The invention provides the LED assembly that thermal diffusivity improves.The LED assembly has: the LED element (14) with the electrode (7) that can carry out the flip-chip installation; Have two-layer above metal level (11,12) and comprise the wiring substrate (16) of the electric insulation layer (10) of macromolecule resin at the interlayer of metal level (11,12); The metallic diaphragm (5) of the LED element of the heat of conduction LED element; In the metal level of wiring substrate, has power supply with metal pattern (11a) and the heat conduction usefulness metal pattern (11b) that forms with the metal pattern electric insulation with power supply as the first metal layer (11) of LED element mounting face.Power supply is connected into by flip-chip with metal pattern and electrode and conducts, heat conduction is connected by flip-chip by electric insulation part (9) with between metal pattern and the metallic diaphragm, heat conduction with the metal level (11,12) beyond metal pattern and the first metal layer by heat-conducting part (13) combination.
Description
Technical field
The present invention relates to LED (Light Emitting Diode: light-emitting diode) element and the LED assembly that forms is installed on the substrate in wiring.
Background technology
The LED assembly is that LED element or LED (the LED component package is become installable state) are formed with wiring that is used for they are powered or wiring substrate combination, useful general electric wire couples together LED concerning simple LED assembly, is combined into the ornamental assembly of electronics of the controller of flicker usefulness.
In recent years,, also develop blue LED element owing to improved the luminous efficiency of LED element, thus, by combined blue LED element and fluorescent material, or the mixing of the light by red, green, blue various LED elements, can produce white light.Therefore, backlight as the small-sized flat-panel monitor (FPD-Flat Panel Display) of mobile phone etc. how.Have again,, originally, adopted in the backlight or ligthing paraphernalia of LCD TV of fluorescent lamp technology and replaced to the product of LED also in market sale as development to this technology.
For in this purposes, using LED, can enumerate following main points.(1) more effectively obtains light; (2) heating of LED element is more effectively dispelled the heat and keep the temperature of LED element lower; (3) can carry out the performance test etc. of LED element.
As one of the solution of above-mentioned (1), the scheme (for example, with reference to patent documentation 1-Japanese kokai publication hei 11-340514 communique) of the LED element of flip-chip mounting means has been proposed.As the solution of above-mentioned (2), adopt the method (for example, with reference to patent documentation 2-TOHKEMY 2006-86139 communique) that the good insulator of heat conduction is increased the conduction surface of heat as auxiliary block.As the solution of above-mentioned (3), be equivalent to be packaged into the state of the LED that the state that can be installed to above-mentioned auxiliary block or other wiring substrate sells.In addition, as the method for comprehensive solution above-mentioned (1), (2), but considered that flip-chip installs and have the scheme (for example, with reference to patent documentation 3-TOHKEMY 20003-110148 communique) of LED element of projection of the electric insulation of heat transmission.
Yet the installation main flow of LED element originally is to adopt on the surface of the good insulator of the heat conduction of the such pottery system of aluminium nitride, the auxiliary block of the metal line pattern that is formed for powering with vapor phase method etc.But, auxiliary block since with wiring substrate to its power supply be relatively independent parts, thereby can cause the formation the number of parts of LED assembly to increase, and because the price height of raw material of the insulator of pottery system own, the manufacturing cost that the surface of this export-oriented auxiliary block forms the vapor phase method that connects up is also high, thereby the price that has hindered the LED assembly descends.
In addition, do not use the insulator of pottery system, and directly flip-chip is welded on the heating panel with the LED assembly that the wiring substrate is connected with the LED element, make it to have thermal conductivity and electrical insulating property simultaneously, comparatively difficult because the thermal conductivity of the insulator of all wiring substrates is low.For example, the thermal conductivity of conductive copper is 398W/mK, and with respect to this, the thermal conductivity of insulator polyimides only is 0.25W/mK.In addition, flip-chip mounted LEDs assembly is in being subjected to the environment of temperature cycles like this, because of the difference of the coefficient of linear expansion of the coefficient of linear expansion of macromolecule resin or metal line and LED element produces stress at grafting material such as soft solder ball or its composition surface, produce the breakage of LED element or the problems such as breakage on grafting material or composition surface sometimes.
Summary of the invention
The invention solves the problems referred to above, a kind of LED assembly that improves thermal diffusivity is provided.
For addressing the above problem of the present invention being constructed as follows.
The feature of the LED assembly of the present invention's first scheme is to have: the LED element with the electrode that can carry out the flip-chip installation; Have two-layer above metal level and comprise the wiring substrate of the electric insulation layer of macromolecule resin at the interlayer of described metal level; Conduct the metallic diaphragm of described LED element of the heat of described LED element; In the described metal level of described wiring substrate, has power supply with metal pattern and the heat conduction metal pattern that forms with the metal pattern electric insulation with described power supply as the first metal layer of described LED element mounting face; Described power supply is connected into by flip-chip with metal pattern and described electrode and conducts; Described heat conduction is connected by flip-chip by electric insulation part with between metal pattern and the described metallic diaphragm; Described heat conduction uses metal pattern and described the first metal layer described metal level in addition by the heat-conducting part combination.
The feature of alternative plan of the present invention is, in the LED of first scheme assembly, is formed with the heat conduction metal part on described metallic diaphragm, is connected with the metal pattern flip-chip with described heat conduction with described electric insulation part with metal part by described heat conduction.
The feature of third party's case of the present invention is, in the LED of alternative plan assembly, be formed with opening on the resist that covers described the first metal layer, described electrode and described heat conduction are connected with the metal pattern flip-chip with described heat conduction with metal pattern with described power supply respectively at described peristome with metal part.
The feature of the cubic case of the present invention is, in any one described LED assembly of first～third party case, described wiring substrate done become band or sheet, at the Width or the length direction of this wiring substrate, or on this both direction with two the above LED elements of arranged spaced arbitrarily.
The feature of the present invention's the 5th scheme is that in any one described LED assembly of the first～the cubic case, described heat-conducting part forms with the material of thermal conductivity more than 30W/mK.
The feature of the present invention's the 6th scheme is that in any one described LED assembly of first～the 5th scheme, described heat-conducting part is at least more than one plating filled vias.
The feature of the present invention's the 7th scheme is that in any one described LED assembly of first～the 6th scheme, the thickness of described electric insulation layer is below 125 μ m more than the 3 μ m.
The feature of the present invention all directions case is that in any one described LED assembly of first～the 7th scheme, described macromolecule resin is 0～6ppm/ ℃ in the coefficient of linear expansion in-40 ℃ to+120 ℃ temperature range.
The feature of the present invention's the 9th scheme is, in any one described LED assembly of first～the 7th scheme, described macromolecule resin is 100MPa (the mensuration frequency of dynamic viscoelastic: 1Hz), and be 1MPa (the mensuration frequency of dynamic viscoelastic: 1Hz) at 240 ℃ dynamic elastic modulus ratio at 100 ℃ dynamic elastic modulus ratio.
The feature of the present invention's the tenth scheme is, in any one described LED assembly of first～the 9th scheme, be combined in an opposite side outer field described metal level of described heat conduction with the described the first metal layer on the metal pattern by described heat-conducting part on the heat radiation object is installed.
The feature of the present invention's the 11 scheme is that in the described LED assembly of the tenth scheme, the thermal conductivity of described heat radiation object is more than 30W/mK.
The feature of the present invention's the 12 scheme is that in the LED assembly of the tenth or the 11 scheme, described heat radiation object is a pottery.
If adopt the present invention, can not needed auxiliary block just can make at an easy rate.And the LED assembly of thermal diffusivity.
Description of drawings
Fig. 1 is the stereogram of the LED assembly of expression first execution mode of the present invention.
Fig. 2 is the A-A cutaway view of Fig. 1.
Fig. 3 is the vertical view of pattern of the first metal layer of expression wiring substrate.
Fig. 4 is the vertical view of other example of pattern of the first metal layer of expression wiring substrate.
Fig. 5 is the cutaway view of the LED assembly of expression second execution mode.
Fig. 6 is the cutaway view of the LED assembly of expression the 3rd execution mode.
Fig. 7 is the cutaway view of the LED assembly of expression the 4th execution mode.
Among the figure:
The 1-Sapphire Substrate; The 2-n type semiconductor layer; The 3-luminescent layer; The 4-p type semiconductor layer; The 5-metallic diaphragm; 6-heat conduction metal part; The 7-electrode; 8-flip-chip articulamentum; The 9-electric insulation part; 10-polymer resin layer (electric insulation layer); The 11-the first metal layer; 11a-power supply metal pattern; 11b-heat conduction metal pattern; 12-second metal level; 13-electroplates filled vias (heat-conducting part); The 14-LED element; The 15-resist; The 16-substrate that connects up; 17-radiator (heat radiation object); 18-the 3rd metal level; The 19-bond layer
Embodiment
Below the execution mode of LED assembly of the present invention is described.
This LED assembly has: the LED element with electrode that flip-chip can be installed; Have two-layer above metal level and comprise the wiring substrate of the electric insulation layer of macromolecule resin at the interlayer of described metal level; Conduct the metallic diaphragm of described LED element of the heat of described LED element; Among the described metal level of described wiring substrate, has power supply with metal pattern and the heat conduction metal pattern that forms with the metal pattern electric insulation with described power supply as the first metal layer of described LED element mounting face, described power supply is connected into by flip-chip with metal pattern and described electrode and conducts, described heat conduction is connected by flip-chip by electric insulation part with between metal pattern and the described metallic diaphragm, described heat conduction with the described metal level beyond metal pattern and the described the first metal layer by the heat-conducting part combination.
The heat of being sent at the LED element is transferred to the heat conduction metal pattern from the metallic diaphragm of LED element by the flip-chip connecting portion with electric insulation part, further is transferred to metal level beyond the first metal layer by heat-conducting part.Like this,, the heat of LED element conducts heat owing to spreading with metal pattern, metal level gradually to heat conduction, thus the thermal diffusivity height, and variable increase is flow through the electric current in the LED assembly and is improved brightness.In addition and since the LED element directly chip upside-down mounting type be installed on the substrate that connects up, thereby can not want auxiliary block, can make at an easy rate.
In addition, preferably form the heat conduction metal part, be connected with the metal pattern flip-chip with above-mentioned heat conduction with above-mentioned electric insulation part with metal part by this heat conduction at above-mentioned metallic diaphragm.Heat conduction can for example be formed on the metallic diaphragm with electrode simultaneously with metal part.
In addition, preferably form opening covering on the resist of above-mentioned the first metal layer, these peristomes above-mentioned electrode and above-mentioned heat conduction with metal part respectively flip-chip be connected to above-mentioned power supply with metal pattern and above-mentioned heat conduction with metal pattern on.
In addition, also can make above-mentioned wiring substrate done and become band or sheet, on the Width of this wiring substrate or length direction or this both direction with the LED assembly of arbitrary interval configuration above-mentioned LED element more than two.Thus, manufacturing cost can be reduced, and the best design of LED assembly can be carried out a plurality of LED arrangements of components in the position of the best etc.
In addition, as the macromolecule resin of the electric insulation layer that is used for above-mentioned wiring substrate, can enumerate resin or their hybrid resins such as polyimides, Polyetherimide, polyamidoimide, polyimides benzoxazoles, epoxy resin, aromatic polyamide.In addition, also rubber can be added in these resins or hybrid resin or filler (filler, reinforcing agent, viscosity modifier) forms.Because the difficulty of THICKNESS CONTROL about 100～200V/ μ m and when making such as the electric simulation strength of the electric insulation layer of these resins etc. etc., the thickness of electric insulation layer wishes to be the above thickness of 3 μ m.In addition, in order to ensure the heat conduction amount to the thickness direction of macromolecule resin that has utilized power supply with the contact area of metal pattern (power supply wiring), the thickness of electric insulation layer is advisable below being thinned to 125 μ m as far as possible.
In addition, making the coefficient of linear expansion of above-mentioned electric insulation layer is 0～6ppm/ ℃ in the temperature range from-40 ℃ to+120 ℃, it is desirable under the situation of the degree identical with the LED element, can reduce because of with the stress that difference produced of the linear expansion of LED element, can expect to improve the reliability under the environment that is subjected to temperature cycles.
In addition, according to other viewpoint, the macromolecule resin that comprises in the preferred above-mentioned electric insulation layer, 100 ℃ dynamic elastic modulus ratios 100MPa (the mensuration frequency of dynamic viscoelastic: 1Hz), and at 240 ℃ dynamic elastic modulus ratio in 1MPa (the mensuration frequency of dynamic viscoelastic: 1Hz).Like this,, the stress that the linear expansion difference by LED element and wiring substrate is produced can be reduced, reliability can be expected to improve being subjected under the environment of temperature cycles by the electric insulation layer of wiring substrate being selected the macromolecule resin of low elasticity.In addition, when the LED element is installed on the wiring substrate, even near 240 ℃ of the reflux temperature that makes the scolding tin fusion, also can prevent the damage of macromolecule resin itself or contact interface by guaranteeing dynamic elastic modulus ratio more than the 1MPa.
In addition, in conjunction with above-mentioned heat conduction with the sectional area little shortcoming of above-mentioned heat-conducting part between the metal level beyond metal pattern and the first metal layer in order to remedy combination, though good especially is with the thermal conductivity of for example guaranteeing 398W/mK by the combination of electro-coppering, if better with the words more than the thermal conductivity of the equal 30W/mK of Pb-free solder.The thermal conductivity of 30W/mK has been compared about 100 times with the thermal conductivity of polyimides.
In addition, above-mentioned heat-conducting part can constitute with more than one at least plating filled vias, and the diameter of phi of electroplating filled vias is preferably below 100 μ m.Wherein, minor diameter via hole, particularly through hole that Φ 60 μ m are following when depositing the copper facing of the thickness more than the pore radius on the two sides of wiring substrate, can be filled plating simultaneously, like this, can lead the quality of stablizing the conducting via hole and the manufacturing cost that reduces the wiring substrate.
In addition, the metallic diaphragm of LED element and heat conduction are considered from the viewpoint of manufacturing cost with the above-mentioned electric insulation part between the metal pattern, wish to be arranged on LED element one side, but both can be located at heat conduction with metal pattern one side, also can be located at two sides.Electric insulation part wishes it is the SiO that is formed by vapor phase method
2, diamond-type carbon electrical insulating films such as (DLC-Diamond Like Carbon).Perhaps, replace the soft solder ball also can make with the good pottery of heat conduction such as aluminium nitride is formed for example cylindric or prism-shaped object be provided with the mode between metal pattern and the metallic diaphragm to be clipped in heat conduction.This occasion does not then need LED element or heat conduction are formed electrical insulating film with metal pattern.
In addition, also can make with the outer field metal level of an opposite side of the first metal layer that combines with metal pattern by heat-conducting part and above-mentioned heat conduction (become heat conduction with or heat transmission metal pattern) on the structure of heat radiation object is installed.The metal cabinet of radiator or machine etc. is arranged as above-mentioned heat radiation object, for example, as long as with will dispel the heat adhering object and being installed on the metal level (heat conduction with or heat transmission metal pattern) of bonding agent.(heat conduction with or heat transmission metal pattern) does not need to power wiring and the area that can increase metal level because the metal level beyond the first metal layer, thereby the bonding bonding agent of the object that is used to dispel the heat can be the general bonding agent with thermal conductivity of the above degree of 1W/mK.
In addition, though as the thermal conductivity of above-mentioned heat radiation object with this meaning more than the Pb-free solder equal extent on more than the also preferred 30W/mK.
In addition, worry reason and make the occasion of LED element destruction owing to the object that uses metal etc. to have conductivity, also can use potteries such as the aluminium oxide of electric insulation or aluminium nitride as above-mentioned heat radiation object because of the electricity such as problem of machine side as above-mentioned heat radiation object.
Below, further use accompanying drawing that embodiments of the present invention are described.
First execution mode
Fig. 1 is the stereogram that expression in series is configured in three LED elements 14 execution mode of the LED assembly that is formed by connecting on the wiring substrate 16 of band shape or sheet.As for the encapsulant (transparent resin or underfill material) or the reflecting plate of LED element 14, though can add as required, Fig. 1 does not represent.
The A-A cross section of Fig. 2 presentation graphs 1.As shown in Figure 2, but LED element 14 has two electrodes 7,7 of installing at wiring substrate 16 side flip-chips and more than one heat conduction with metal part 6.The LED element 14 of illustrative example is at first to deposit and form the n type semiconductor layer of being made up of III group-III nitride semiconductor etc. 2 by organic metal vapor growth method etc. on Sapphire Substrate 1, luminescent layer (active layer) 3 and p type semiconductor layer 4 utilize etching to remove the part of p type semiconductor layer 4, luminescent layer 3 and n type semiconductor layer 2.Then, utilize evaporation etc. on n type semiconductor layer 2, to form electrode (n electrode) 7, simultaneously, utilize evaporation etc. after forming metallic diaphragm 5 on the p type semiconductor layer 4, on metallic diaphragm 5, form electrode (p electrode) 7 and heat conduction with metal part 6.When metallic diaphragm 5 becomes the bottom of electrode (p electrode) 7 and heat conduction usefulness metal part 6, also become the thermal-arrest layer of the heat of accepting luminescent layer 3 and be subjected to thermosphere.And metallic diaphragm 5 is still the reflector that reflexes to Sapphire Substrate 1 side from the light of luminescent layer 3.
The LED that obtains is like this made chip with substrate, make LED element 14.
The LED element 14 that wiring substrate 16 has polymer resin layer 10 as electric insulation layer, be formed at polymer resin layer 10 carries the first metal layer 11 on the face of a side, be formed at second metal level 12 on another face of polymer resin layer 10, cover the resist 15 of the first metal layer 11 sides.The first metal layer 11 is made up of with metal pattern 11b with metal pattern 11a and with the heat conduction that power supply forms with metal pattern 11a electric insulation the power supply that is electrically connected to electrode 7,7.Wiring substrate 16 both can be flexible also can be rigidity
The material of the first metal layer 11 and second metal level 12 copper from heat conduction and conduction is proper, but also can use the alloy etc. of aluminium or copper.
Interlayer when heat conduction is copper with metal pattern 11b connects in order to method is proper down.At first, the film of preparing the system of polyimides for example is as polymer resin layer 10, beats identifying hole (not shown) about several Φ 1～2mm that also use with the laser machine limit in pattern forms, and the through hole 10a of Φ 15～60 μ m of interlayer connection usefulness is got on the limit.They are put on the sputter equipment processing anticorrosive coat and copper sputtering layer on whole of the wall that comprises through hole 10a.Subsequently, they are put on the copper plating device, whole face is carried out copper facing.At this moment, above if copper-plated thickness reaches the radius of through hole 10a, then through hole 10a is filled (electroplating filled vias 13) by copper facing, but considers that surplus also can plate the thickness about 5 μ m again.At this moment, the diameter of the identifying hole about a plurality of Φ 1～2mm is wanted about 2 times of little electroplating thickness, but because the centre coordinate of identifying hole is constant, thereby use this identifying hole, the necessary pattern that exposes to, and through developing etching, form power supply the metal pattern 11a and the heat conduction metal pattern 11b of the first metal layer 11, and then form second metal level (heat conduction or heat transmission metal pattern) 12.
When forming, the pattern that partly adds usefulness of necessity is exposed after the above-mentioned copper sputter and develop, carry out the filling of via hole and the formation of pattern with copper facing with semi-additive process.
All coat or paste the resist of exposure usefulness under every kind of situation, remove resist after pattern is finished.
Secondly, by photonasty resist 15 usefulness printing ink are printed, or after carrying out lamination with dry film, expose again, develop, connect the electrode 7,7 of the profile pattern of needed resist 15 and LED element 14 and heat conduction opening 15a thereby be formed for flip-chip with metal part 6.Particularly be envisioned for the following situation of Φ 0.1mm, thereby this situation also can be used laser processing owing to be used for the opening 15a of flip-chip connection.Then, power supply is electroplated with the metal pattern 11b and second metal level 12 with metal pattern 11a, heat conduction.Electroplate the gold-plated etc. of silver-plated, the Ni bottom select the Pd bottom as required.If carry out mask, also can determine respectively whether to electroplate or different kinds to each metal pattern.
Then, form electric insulation part 9 in heat conduction with the opening 15a that the flip-chip on the metal pattern 11b connects usefulness.Electric insulation part 9 is for example SiO by plasma CVD method (chemical vapor deposition method) etc.
2Or electrical insulating film such as DLC forms the thickness (for example 1～5 μ m) that can obtain necessary insulation.The heat conduction of this electric insulation part 9 and LED element 14 with being connected of metal part 6, in the occasion that adopts the soft solder ball, is wished the metal that the soft solders such as the most surperficial formation gold in electric insulation part 9 soak into.
Subsequently, utilize the opening 15a of resist 15, place the soft solder ball and reflux, the soft solder ball is connected on the wiring substrate 16.Then, the heat conduction of LED element 14 is placed into metal part 6 and electrode 7 on the soft solder ball of opening 15a,, forms flip-chip articulamentum 8, finish electricity, mechanical being connected of LED element 14 and wiring substrate 16 by refluxing once more.Then, resin-sealed LED element 14 is finished the LED assembly.In the occasion of the reflecting plate that needs the LED element to use, install with method such as bonding in the front and back of LED element 14 being carried wiring substrate 16.
Mainly pass on the metallic diaphragm 5 of LED element 14 in the heat that the luminescent layer 3 of LED element 14 produces and assemble, and pass to heat conduction metal pattern 11b by heat conduction with metal part 6, flip-chip articulamentum 8 and electric insulation part 9 from metallic diaphragm 5, further pass to second metal level 12, dispel the heat effectively from second metal level, 12 grades by electroplating filled vias 13.
Below, illustrate and power with metal pattern and heat conduction metal pattern.
Fig. 3 represents to connect up the power supply of substrate 16 with a metal pattern 11a and heat conduction example with metal pattern 11b.Also have, what represent among Fig. 3 is three LED elements 14 of configuration on the Width of wiring substrate 16, has disposed a plurality of LED assemblies at length direction.In this LED assembly, utilize with two electrodes 7 and three heat conduction and each LED element 14 is attached on the substrate 16 that connects up with five corresponding flip-chip articulamentums 8 of metal part 6.Power supply separates with spacer with metal pattern 11b and by electric insulation with metal pattern 11a and heat conduction.Heat conduction is connected with second metal level 12 at the back side of wiring substrate 16 with metal pattern 11b.
In addition, power supply separates each LED element 14 usefulness spacer with metal pattern 11a.Whether so, can carry out the test of LED element 14 singly, it is qualified to confirm by test, and after having carried out repairing when defective products is arranged, available wire jumper etc. will be powered with connecting into necessary circuit between the metal pattern 11a.Certainly, power supply also is easy with metal pattern 11a from initial patterning case formation connection state.
Fig. 4 has represented to further consider heat-resisting circulative power supply metal pattern 11a and heat conduction other example of metal pattern 11b.What use as polymer resin layer 10 is to be the resin of 0～6ppm/ ℃ polyimides system-40 ℃～+ 120 ℃ applied temps scope coefficient of linear expansion, perhaps use dynamic elastic modulus ratio after the sclerosis below 100MPa (dynamically the mensuration temperature of viscoelastic rate is 100 ℃, and mensurations frequency is 1Hz) epoxy resin and the hybrid resin of acrylic rubber.Utilize each flip-chip articulamentum 8 to engage again, make power supply all independent with metal pattern 11b with metal pattern 11a and heat conduction with LED element 14.Thus, owing to reduce the influence of the coefficient of linear expansion that the first metal layer 11 has, the characteristic that polymer resin layer 10 has can be effectively utilized, thereby when the LED assembly stands temperature cycles, the stress of LED element 14 or LED element 14 and the connecting portion of wiring substrate 16 can be reduced to be applied to.
Second execution mode
What Fig. 5 represented is second execution mode that also is provided with on the LED of Fig. 1 assembly for the radiating efficiency that improves LED element 14 as the radiator 17 of heat radiation object.As long as radiator 17 has heat sinking function, also can be the casing of machine side.As shown in Figure 5, radiator 17 utilizes bond layer 19 to be bonded on second metal level 12 of wiring substrate 16.For the installation method of radiator, though the good adhesives of heat conduction is proper, as long as also can adopt the method for pushing by silicone grease with pushing with anchor clamps (not shown).
The 3rd execution mode
The LED assembly of the 3rd execution mode is made three-layer structure with the wiring substrate 16 of second execution mode of above-mentioned Fig. 5 as shown in Figure 6.That is, on second metal level 12, also be provided with the 3rd metal level 18 by polymer resin layer 10.Though increased one deck polymer resin layer 10 and the part of thickening makes inevitable to the increase of the heat conduction impedance of radiator 17 from LED element 14 than above-mentioned second execution mode, but pass through attenuate polymer resin layer 10 as far as possible, perhaps increase the heat dissipation capacity of radiator 17, just can alleviate its influence.In addition, as second metal level 12, in the occasion of heat conducting pattern of insulation that can form and power, but by connecting this heat conducting pattern with the plating filled vias and the 3rd metal level 18 also can improve radiating efficiency.
The 4th execution mode
The difference of the 4th execution mode and above-mentioned first execution mode is: be not that electric insulation part 9 is located at wiring substrate 16 sides and is provided in a side of LED element 14 sides.That is, in the operation of making LED element 14, electric insulation part 9 is set on metallic diaphragm 5, heat conduction metal part 6 is set thereon again.Also can between electric insulation part 9 and metallic diaphragm 5 or heat conduction are with metal part 6, be provided for guaranteeing the layer as substrate of adaptation.Wish to adopt SiO as electric insulation part 9
2Or electrical insulating film such as DLC.
The LED assembly of above-mentioned execution mode can be applicable to small-sized FPD backlight of mobile phone etc., simultaneously, and also applicable to purposes such as backlight, the neon signs of lighting device or LCD TV.
Claims (12)
1. LED assembly is characterized in that having:
LED element with the electrode that can carry out the flip-chip installation;
Have two-layer above metal level and comprise the wiring substrate of the electric insulation layer of macromolecule resin at the interlayer of described metal level;
Conduct the metallic diaphragm of described LED element of the heat of described LED element;
In the described metal level of described wiring substrate, the first metal layer that is positioned at described LED element mounting face has power supply with metal pattern and the heat conduction metal pattern that forms with the metal pattern electric insulation with described power supply;
Described power supply is connected into by flip-chip with metal pattern and described electrode and conducts;
Described heat conduction is connected by flip-chip by electric insulation part with between metal pattern and the described metallic diaphragm;
Described heat conduction uses metal pattern and described the first metal layer described metal level in addition by the heat-conducting part combination.
2. LED assembly according to claim 1 is characterized in that:
On described metallic diaphragm, be formed with the heat conduction metal part, be connected with the metal pattern flip-chip with described heat conduction with described electric insulation part with metal part by described heat conduction.
3. LED assembly according to claim 2 is characterized in that:
Be formed with opening on the resist that covers described the first metal layer, described electrode and described heat conduction are connected with the metal pattern flip-chip with described heat conduction with metal pattern with described power supply respectively at described peristome with metal part.
4. LED assembly according to claim 1 is characterized in that:
Described wiring substrate done become band or sheet, at the Width or the length direction of this wiring substrate, or on this both direction with two the above LED elements of arranged spaced arbitrarily.
5. LED assembly according to claim 1 is characterized in that:
Described heat-conducting part forms with the material of thermal conductivity more than 30W/mK.
6. LED assembly according to claim 1 is characterized in that:
Described heat-conducting part is at least more than one plating filled vias.
7. LED assembly according to claim 1 is characterized in that:
The thickness of described electric insulation layer is below 125 μ m more than the 3 μ m.
8. LED assembly according to claim 1 is characterized in that:
Described macromolecule resin is 0～6ppm/ ℃ in the coefficient of linear expansion in-40 ℃ to+120 ℃ temperature range.
9. LED assembly according to claim 1 is characterized in that:
Described macromolecule resin is below the 100MPa at 100 ℃ dynamic elastic modulus ratio, and is more than the 1MPa at 240 ℃ dynamic elastic modulus ratio, and wherein, the mensuration frequency of dynamic viscoelastic is 1Hz.
10. LED assembly according to claim 1 is characterized in that:
Be combined in an opposite side outer field described metal level of described heat conduction with the described the first metal layer on the metal pattern by described heat-conducting part on the heat radiation object is installed.
11. LED assembly according to claim 10 is characterized in that:
The thermal conductivity of described heat radiation object is more than 30W/mK.
12., it is characterized in that according to claim 10 or 11 described LED assemblies:
Described heat radiation object is a pottery.
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| JP2006295294 | 2006-10-31 | ||
| JP2006295294 | 2006-10-31 | ||
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| CN100559583C true CN100559583C (en) | 2009-11-11 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103190204A (en) * | 2010-11-03 | 2013-07-03 | 3M创新有限公司 | Flexible LED device with wire bond free die |
| CN104334958A (en) * | 2012-05-29 | 2015-02-04 | 皇家飞利浦有限公司 | Internal envelope infrastructure for electrical devices |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102222737B (en) * | 2008-12-18 | 2013-06-05 | 长春藤控股有限公司 | LED (Light Emitting Diode) encapsulating body and encapsulating method thereof |
| JP5526876B2 (en) * | 2010-03-09 | 2014-06-18 | 東京エレクトロン株式会社 | Heating device and annealing device |
| TW201235609A (en) * | 2010-07-13 | 2012-09-01 | Koninkl Philips Electronics Nv | Low cost mounting of LEDs in TL-retrofit tubes |
| CN103325916A (en) * | 2012-12-14 | 2013-09-25 | 芜湖德豪润达光电科技有限公司 | Light emitting diode packaging structure and manufacturing method thereof |
| CN109526134A (en) * | 2018-12-18 | 2019-03-26 | 惠科股份有限公司 | A kind of driving mould group, production method and display device |
| CN113540308B (en) * | 2020-04-22 | 2023-06-09 | 东莞市中麒光电技术有限公司 | Substrate structure of LED display module and manufacturing method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103190204A (en) * | 2010-11-03 | 2013-07-03 | 3M创新有限公司 | Flexible LED device with wire bond free die |
| CN103190204B (en) * | 2010-11-03 | 2016-11-16 | 3M创新有限公司 | There is the flexible LED device of wire bond-tube core |
| CN104334958A (en) * | 2012-05-29 | 2015-02-04 | 皇家飞利浦有限公司 | Internal envelope infrastructure for electrical devices |
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| CN101202273A (en) | 2008-06-18 |
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