CN204809193U - Packaging structure of fingerprint identification chip - Google Patents

Packaging structure of fingerprint identification chip Download PDF

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Publication number
CN204809193U
CN204809193U CN201520324189.XU CN201520324189U CN204809193U CN 204809193 U CN204809193 U CN 204809193U CN 201520324189 U CN201520324189 U CN 201520324189U CN 204809193 U CN204809193 U CN 204809193U
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China
Prior art keywords
chip
induction
substrate
plastic packaging
packaging layer
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CN201520324189.XU
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Chinese (zh)
Inventor
王之奇
杨莹
喻琼
王蔚
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China Wafer Level CSP Co Ltd
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China Wafer Level CSP Co Ltd
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    • 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
    • H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
    • H01L2224/31—Structure, shape, material or disposition of the layer connectors after the connecting process
    • H01L2224/32—Structure, shape, material or disposition of the layer connectors after the connecting process of an individual layer connector
    • H01L2224/321—Disposition
    • H01L2224/32151—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
    • H01L2224/32221—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
    • H01L2224/32225—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
    • 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
    • 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
    • H01L2224/481—Disposition
    • H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
    • H01L2224/48221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
    • H01L2224/48225—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
    • H01L2224/48227—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation connecting the wire to a bond pad of the item
    • 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
    • H01L2224/484—Connecting portions
    • H01L2224/48463—Connecting portions the connecting portion on the bonding area of the semiconductor or solid-state body being a ball bond
    • H01L2224/48465—Connecting portions the connecting portion on the bonding area of the semiconductor or solid-state body being a ball bond the other connecting portion not on the bonding area being a wedge bond, i.e. ball-to-wedge, regular stitch
    • 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
    • H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
    • H01L2224/732—Location after the connecting process
    • H01L2224/73251—Location after the connecting process on different surfaces
    • H01L2224/73265—Layer and wire connectors
    • 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
    • H01L2224/91—Methods for connecting semiconductor or solid state bodies including different methods provided for in two or more of groups H01L2224/80 - H01L2224/90
    • H01L2224/92—Specific sequence of method steps
    • H01L2224/922—Connecting different surfaces of the semiconductor or solid-state body with connectors of different types
    • H01L2224/9222—Sequential connecting processes
    • H01L2224/92242—Sequential connecting processes the first connecting process involving a layer connector
    • H01L2224/92247—Sequential connecting processes the first connecting process involving a layer connector the second connecting process involving a wire connector
    • 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
    • H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
    • H01L2924/181—Encapsulation
    • 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
    • H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
    • H01L2924/181—Encapsulation
    • H01L2924/1815—Shape

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Abstract

The utility model provides a packaging structure of fingerprint identification chip, includes: provide the base plate, base plate surface coupling sensing chip, sensing chip has first surface and the second surface relative with the first surface, sensing chip's first surface includes the induction zone, sensing chip's second surface is located the substrate surface, base plate and some sensing chip surface form the plastic envelope layer, the plastic envelope layer exposes the induction zone. Packaging structure of fingerprint identification chip's sensitivity improves, and packaging technology simplifies, and manufacturing cost reduces.

Description

The encapsulating structure of fingerprint recognition chip
Technical field
The utility model relates to technical field of manufacturing semiconductors, particularly relates to a kind of encapsulating structure of fingerprint recognition chip.
Background technology
Along with the progress of modern society, the importance of person identification and personal information security progressively receives the concern of people.Because somatic fingerprint has uniqueness and consistency, make fingerprint identification technology have fail safe good, reliability is high, feature easy to use, makes fingerprint identification technology be widely used in protecting the various fields of personal information security.And along with the development of science and technology, the information security issue of each electronic product is one of concern main points of technical development all the time.Especially for mobile terminal, such as mobile phone, notebook computer, dull and stereotyped computer, digital camera etc., the demand for Information Security is more outstanding.
The sensing mode of existing fingerprint recognition device comprises condenser type (Electric field) and inductance type, and user fingerprints by extracting user fingerprints, and is converted to signal of telecommunication output by fingerprint recognition device, thus obtains the finger print information of user.Concrete, as shown in Figure 1, Fig. 1 is the cross-sectional view of a kind of fingerprint recognition device of prior art, comprising: substrate 100; Be coupled in the fingerprint recognition chip 101 on substrate 100 surface; Be covered in the glass substrate 102 on described fingerprint recognition chip 101 surface.
For capacitance type fingerprint identification chip, in described fingerprint recognition chip 101, there is one or more capacitor plate.The epidermis pointed due to user or hypodermic layer have protruding ridge and the paddy of depression, when user points 103 contact described glass substrate 102 surface, described ridge is different to the distance of fingerprint recognition chip 101 from paddy, therefore, user points 103 ridges or the capacitance between paddy from capacitor plate is different, and fingerprint recognition chip 101 can obtain described different capacitance, and be translated into the output of the corresponding signal of telecommunication, and after fingerprint recognition device gathers the suffered signal of telecommunication, the finger print information of user can be obtained.
But the fingerprint recognition device adopting prior art to manufacture is higher for the sensitivity requirement of induction chip, thus makes the manufacture of fingerprint recognition device and application be restricted, and makes manufacturing cost improve.
Utility model content
The problem that the utility model solves is to provide a kind of encapsulating structure of fingerprint recognition chip, and the sensitivity of the encapsulating structure of described fingerprint recognition chip improves, and packaging technology simplifies, and manufacturing cost reduces.
For solving the problem, the utility model provides a kind of encapsulating structure of fingerprint recognition chip, comprising:
Substrate;
Be coupled in the induction chip of described substrate surface, described induction chip has first surface and the second surface relative with first surface, and the first surface of described induction chip comprises induction zone, and the second surface of described induction chip is positioned at substrate surface;
Be positioned at the plastic packaging layer on described substrate and part induction chip surface, described plastic packaging layer exposes described induction zone.
Optionally, also comprise: the first surface of described induction chip has the external zones surrounding described induction zone.
Optionally, described plastic packaging layer covers surface, described external zones.
Optionally, also comprise: be positioned at the induction zone of described induction chip and the chip circuit on surface, external zones; Be positioned at first weld pad on surface, described induction chip external zones; Described chip circuit is connected with described first weld pad.
Optionally, also comprise: described substrate has the 3rd surface, described induction chip is coupled in the 3rd surface of substrate, and the 3rd surface of described substrate has the second weld pad.
Optionally, also comprise: conductor wire, described conductor wire two ends are connected with the second weld pad with the first weld pad respectively.
Optionally, described plastic packaging layer surrounds described conductor wire.
Optionally, the surface of described plastic packaging layer is 100 microns ~ 150 microns to the distance on induction chip surface.
Compared with prior art, the technical solution of the utility model has the following advantages:
In structure of the present utility model, described induction chip is coupled in substrate surface, and described substrate and part induction chip surface have the plastic packaging layer exposing induction chip induction zone.Induction chip and substrate can interfix by described plastic packaging layer; And described plastic packaging layer can, while protection induction chip induction zone is with exterior domain, make the induction zone of induction chip be exposed completely.Because surface, described induction zone is uncovered, the finger print information of user can be obtained by direct sensed chip, thus the sensing capability of induction chip is played to greatest extent.Make the sensitivity of described fingerprint recognition chip-packaging structure get a promotion thus, and the manufacturing cost of described fingerprint recognition chip is minimized.
Further, the surface of described induction chip induction zone has passivation layer, and the material of described passivation layer is insulating material.Because described plastic packaging layer exposes the induction zone of described induction chip, the finger of user is directly contacted with surface, induction zone.And the surface of described induction chip induction zone is when having passivation layer, electric insulation can be realized between the chip circuit of user's finger and induction zone or sensing device, make the chip circuit of induction zone or sensing device obtain isolation and protection.Thus, even if plastic packaging layer exposes the induction zone of induction chip, also harmful effect can not be caused to the service behaviour of induction chip.
Accompanying drawing explanation
Fig. 1 is the cross-sectional view of a kind of fingerprint recognition device of prior art;
Fig. 2 is a kind of cross-sectional view of fingerprint recognition chip structure embodiment;
Fig. 3 to Fig. 8 is the cross-sectional view of the forming process of the fingerprint recognition chip of the utility model embodiment.
Embodiment
As stated in the Background Art, the fingerprint recognition device adopting prior art to manufacture is higher for the sensitivity requirement of induction chip, thus the manufacture of fingerprint recognition device and application are restricted, and manufacturing cost is improved.
Find through research; please continue to refer to Fig. 1; fingerprint recognition chip 101 surface coverage has glass substrate 102; described glass substrate 102 is for the protection of fingerprint recognition chip 101; and the finger 103 of user directly contacts with described glass substrate 102; therefore, in order to ensure that described glass substrate 102 has enough protective capabilities, the thickness of described glass substrate 102 is thicker.But, because the thickness of described glass substrate 102 is thicker, higher to the sensitivity requirement of fingerprint recognition chip 101, guarantee accurately to extract user fingerprints with this.But highly sensitive fingerprint recognition chip manufacturing difficulty is comparatively large, manufacturing cost is higher, then causes the application of fingerprint recognition chip and popularization to be restricted.
In order to reduce the requirement to the sensitivity of fingerprint recognition chip, propose another kind of fingerprint recognition chip structure, please refer to Fig. 2, comprising: substrate 200, described substrate 200 has first surface 230, and the first surface 230 of described substrate 200 has some first soldering pad layers 205; Be positioned at the induction chip 201 of substrate 200 first surface 230, described induction chip 201 has first surface 210 and the second surface 220 relative with first surface 210, the second surface 220 of described induction chip 201 is positioned at the first surface 210 of substrate 200, the first surface 210 of described induction chip 201 has induction zone 211 and surrounds the external zones 212 of described induction zone 211, induction chip 201 surface of described external zones 212 has some second soldering pad layers 207, and the position of described second soldering pad layer 207 and the first soldering pad layer 205 and quantity one_to_one corresponding; Some wires 208 that two ends are electrically connected with described first soldering pad layer 205 and the second soldering pad layer 207 respectively, wherein, to be positioned on described wire 208 and distance substrate 200 first surface 210 is summit A apart from maximum point, described summit is the first distance to induction chip first surface 210; Be positioned at the plastic packaging layer 203 on substrate 200 and induction chip 201 surface, the material of described plastic packaging layer 203 is polymer, described plastic packaging layer 203 surrounds described wire 208 and induction chip 201, plastic packaging layer 203 surface on described induction zone 201 is smooth, described plastic packaging layer 203 surface has second distance to induction chip 201 first surface 210, and described second distance is greater than the first distance.
Wherein, traditional glass substrate is substituted, for direct and user's finger contacts by the plastic packaging layer being positioned at surface, induction zone 211.Owing to eliminating glass substrate, be conducive to the sensing capability improving induction chip 201.But, because described induction chip 201 realizes being electrically connected by wire 208 with between substrate 200, and described wire 208 has the summit A higher than induction chip 201 first surface 210, described wire 208 is surrounded completely in order to make described plastic packaging layer 203, the surface of described plastic packaging layer 203 needs to be greater than first distance of wire 208 summit A to induction chip 201 first surface 210 to the second distance of induction chip 201 first surface 210, and plastic packaging layer 203 thickness being positioned at induction chip 201 first surface 210 is still thicker.And, because described plastic packaging layer 203 also covers the induction zone 211 of induction chip 201, therefore, plastic packaging layer 203 thickness being positioned at surface, induction zone 211 is thicker, then described plastic packaging layer 203 is still unfavorable for the induction sensitivity improving induction chip 201, then the sensing capability of formed encapsulating structure is poor.
In order to solve the problem, the utility model provides a kind of encapsulating structure of fingerprint recognition chip.By after induction chip is coupled in substrate surface; the plastic packaging layer exposing induction chip induction zone is formed at substrate and part induction chip surface; induction chip and substrate are interfixed by described plastic packaging layer; and while the region that described plastic packaging layer is protected beyond induction chip induction zone, the induction zone of induction chip is exposed completely.Because surface, described induction zone is uncovered, the sensing capability of induction chip can be made to be applied to greatest extent.Therefore, the sensitivity of the encapsulating structure of the fingerprint recognition chip formed gets a promotion.
For enabling above-mentioned purpose of the present utility model, feature and advantage more become apparent, and are described in detail specific embodiment of the utility model below in conjunction with accompanying drawing.
Fig. 3 to Fig. 8 is the cross-sectional view of the forming process of the fingerprint recognition chip of the utility model embodiment.
Please refer to Fig. 3, substrate 300 is provided.
Described substrate 300 is rigid substrate or flexible base plate.In the present embodiment, described substrate 200 is rigid substrate, and described rigid substrate is PCB substrate, glass substrate, metal substrate, semiconductor substrate or polymeric substrates.
In the present embodiment, described substrate 300 has the 3rd surface 330, and the 3rd surface 330 of described substrate 300 is follow-up for inductive coupling chip.3rd surface 330 of described substrate 300 has wiring layer (not shown) and the second weld pad 331, and described wiring layer is connected with described second weld pad 331, and described second weld pad 331 is for being connected with the chip circuit on induction chip surface.
In one embodiment, form connecting portion in one end of described substrate 300, described connecting portion is used for induction chip is electrically connected with external circuit.The material of described connecting portion comprises electric conducting material, described connecting portion is electrically connected with described wiring layer, enable the chip circuit on described induction chip realize being electrically connected with external circuit or device by the wiring layer on substrate 300 the 3rd surface 330 and connecting portion, transmit the signal of telecommunication with this.
Afterwards, at the surperficial inductive coupling chip of described substrate 300, be described to the step at the surperficial inductive coupling chip of substrate 300 below.
Please refer to Fig. 4, at the fixing induction chip 301 in described substrate 300 surface, described induction chip 301 has first surface 310 and the second surface 320 relative with first surface 310, the first surface 310 of described induction chip 301 comprises induction zone 311, and the second surface 320 of described induction chip 301 is positioned at substrate 300 surface.
In the present embodiment, adhere to the first tack coat at the second surface 320 of described induction chip 301, and described first adhesion layer is pasted on the 3rd surface 330 of described substrate 300, thus make described induction chip 301 be fixed on the first surface 350 of substrate 300.Subsequently through routing technique, described induction chip 301 can be made to be coupled with described substrate 300, even if realize between described induction chip 301 and the wiring layer on substrate 300 surface being electrically connected.
In another embodiment, the first adhesion layer can also be formed on the 3rd surface 330 of described substrate 300, induction chip 301 is pasted on described first adhesion layer surface, make induction chip 301 be fixed on substrate 300 surface.
In the present embodiment, in the induction zone 311 of described induction chip 301, be formed with the sensing device for obtaining user fingerprints information; Described sensing device comprises capacitance structure or induction structure, makes described induction zone 311 can detect and receive the finger print information of user.
The first surface 310 of described induction chip 301 also comprises the external zones 312 surrounding described induction zone 311.In the induction zone 311 and external zones 312 of described induction chip 301 first surface 310, be also formed with chip circuit, described chip circuit is electrically connected with the sensing device in induction zone 311, and the signal of telecommunication exported for sensing device processes.
In the present embodiment, in described induction zone 311, form at least one capacitor plate, when user's finger is placed in surface, induction zone 311, described capacitor plate and user point formation capacitance structure; And described induction zone 311 can obtain user's finger surface ridge and the capacitance difference between paddy and capacitor plate, and export after described capacitance difference is processed by chip circuit, obtain user fingerprints data with this.
In the present embodiment, plastic packaging layer due to follow-up formation exposes the induction zone 311 of induction chip 301, the finger of user can directly contact with surface, induction zone 311, therefore, in order to ensure that user points and mutually isolated between capacitor plate in induction zone 311, the surface of described induction chip 301 induction zone 311 also has passivation layer, and the material of described passivation layer is insulating material.Described passivation layer is used for as the dielectric layer between user's finger and capacitor plate, to form the capacitance structure that can obtain user fingerprints information; And described passivation layer can also be used for avoiding the chip circuit in induction zone 311 and sensing device to be worn, and make chip circuit and sensing device and external environment condition electric insulation.
The first surface 310 of described induction chip 301 also has the first weld pad 313 being positioned at surface, described induction chip external zones 312; Described chip circuit is connected with described first weld pad 313, subsequently through routing technique, the first weld pad 313 can be made to realize being electrically connected with the wiring layer on substrate 300 surface.
Please refer to Fig. 5, described induction chip 301 is coupled with substrate 300.
Before the described plastic packaging layer of formation, form conductor wire 302, described conductor wire 302 two ends are connected with the second weld pad 331 with the first weld pad 313 respectively.
Namely described induction chip 301 is coupled with substrate 300 is make described induction chip 301 can realize electrical interconnection with described substrate 300.In the present embodiment, make to state induction chip 301 by routing technique to be coupled with substrate 300.
In the present embodiment, before follow-up formation plastic packaging layer, form conductor wire 302 by routing technique, described conductor wire 302 two ends are connected with the second weld pad 331 with the first weld pad 313 respectively, make electrical interconnection between described induction chip 301 and substrate 300.Described conductor wire 302 can make chip circuit be electrically connected with the wiring layer on substrate 300 surface, and described wiring layer is electrically connected with connecting portion, makes the chip circuit on induction chip 301 surface and induction zone 311 can carry out the transmission of the signal of telecommunication with external circuit or device.The material of described conductor wire 302 is metal, and described metal is copper, tungsten, aluminium, gold or silver-colored.The technique adopting routing technique that induction chip 301 is electrically connected with substrate 300 is simple, and process costs is cheap.
Described routing technique comprises: provide conductor wire 302; Described conductor wire 302 two ends are connected with the second weld pad 331 with the first weld pad 313 respectively by welding procedure.The material of described conductor wire 302 is metal, and described metal is copper, tungsten, aluminium, gold or silver-colored.
Because described conductor wire 302 is connected between the first weld pad 313 and the second weld pad 331, therefore described conductor wire 302 bends; Described conductor wire 304 has to the maximum point of substrate 300 surface distance, the point maximum to substrate 300 surface distance on described conductor wire 304 is summit, and described summit is higher than first surface 310 surface of described induction chip 301.Because the follow-up needs of described conductor wire 302 are wrapped up by plastic packaging layer, to make between described conductor wire 302 and induction chip 301 and electric isolution between conductor wire 302 and external environment condition, therefore, described summit also needs the plastic packaging layer surface lower than follow-up formation, the plastic packaging layer of follow-up formation is enable to wrap up described conductor wire 302 completely, to avoid described conductor wire 302 exposed.
Form plastic packaging layer at described substrate 300 and part induction chip 301 surface, described plastic packaging layer exposes described induction zone 311; The formation process of described plastic packaging layer is Shooting Technique.Be described to the forming step of described plastic packaging layer below.
Please refer to Fig. 6, provide mould 304, described mould 304 comprises the 4th surface 340, and described 4th surface 340 has the corresponding district 342 in the corresponding district 341 of induction and periphery, and surface, described induction corresponding district 341 is higher than surface, corresponding district 342, periphery.
Described mould 304 is for defining the shape of the plastic packaging layer of follow-up formation.In the present embodiment; the plastic packaging layer of follow-up formation needs the induction zone 311 exposing induction chip 301; and the region surface that the external zones 312 of induction chip 301 and substrate 300 expose needs the covering of plastic packaging layer to protect, and the shape of described mould 304 needs corresponding with the shape of the plastic packaging layer of follow-up formation.
4th surface 340 of described mould 304 is follow-up towards substrate 300 and induction chip 301 pressing, the corresponding district 341 of induction of described mould 304 is corresponding with the induction zone 311 of induction chip 301, and the corresponding district 342, periphery of described mould is corresponding with the region that external zones 312 and the substrate 300 of induction chip 301 expose; Because surface, described induction corresponding district 341 is higher than surface, corresponding district 342, periphery, when described mould 304 is to after induction chip 301 and substrate 300 pressing, the surface in the corresponding district 341 of described induction and the surface contact of induction zone 311 can be made, and corresponding district 342, described periphery and can form plastic packaging space between external zones 312 and substrate 300, described plastic packaging space is in order to form plastic packaging layer.
Described induction corresponding district 341 arrives on surface the thickness of the difference in height on surface, peripheral corresponding district 342 and the plastic packaging floor on follow-up formation and surface, external zones 312.In the present embodiment, surface, described induction corresponding district 341 is 100 microns ~ 150 microns to the difference in height on surface, peripheral corresponding district 342.
Please refer to Fig. 7, by the 4th surface 340 of described mould 304 towards substrate 300 and induction chip 301 pressing, plastic packaging space 305 is formed between substrate 300 and mould 304, the corresponding district 341 of induction of described mould 304 is corresponding with the induction zone 311 of induction chip 301, and the corresponding district 342, periphery of described mould 304 is corresponding with the external zones 312 of induction chip 301.
The plastic packaging space 305 be made up of described mould 304 and substrate 300 and induction chip 301 is for the formation of plastic packaging layer.
In the present embodiment, on the 4th surface 340 of described mould 304 to after substrate 300 and induction chip 301 pressing, surface, described induction corresponding district 341 contacts with the surface, induction zone 311 of induction chip 301, follow-up in described plastic packaging space 305, form plastic packaging layer after, described plastic packaging layer can not cover described induction zone 311, thus makes formed plastic packaging layer expose described induction zone 311.User's finger can directly contact with described induction zone 311, thus improves the sensitivity of induction chip 301.
In another embodiment, between described induction surface, corresponding district 341 and induction chip 301 surface, there is predeterminable range; Because surface, described induction corresponding district 341 is outstanding relative to surface, corresponding district 342, described periphery; therefore; on the 4th surface 340 of described mould 304 to after substrate 300 and induction chip 301 pressing; surface, peripheral corresponding district 342 is greater than described predeterminable range to the distance of induction chip 301 external zones 312; namely the follow-up plastic packaging layer thickness being formed at surface, external zones 312 is greater than the plastic packaging layer thickness on surface, induction zone 311; then surface, described induction zone 311 has the protection of plastic packaging layer; and described plastic packaging layer thickness is thinner, the obstruction caused the sensitivity of induction chip 301 is limited.
4th surface 340 in corresponding district, described periphery 342 is lower than the 4th surface 340 in the corresponding district 341 of described induction, plastic packaging space can be formed between the region that 4th surface 340 in corresponding district 342, described periphery and induction chip 301 external zones 312 and substrate 300 expose, follow-up in described plastic packaging space, form plastic packaging layer after, described plastic packaging layer can cover surface, induction chip 301 external zones 312 and substrate 300 surperficial.
Please refer to Fig. 8, in described plastic packaging space 305 (as shown in Figure 7), fill capsulation material, and be cured, form plastic packaging layer 306.
In the present embodiment, described plastic packaging layer 306 covers surface, described external zones 312, and exposes surface, described induction zone 311, and user's finger can directly contact with described induction zone 311, and the sensitivity of induction chip is promoted.In other embodiments, surface, described induction zone 311 can have plastic packaging layer and cover, and the plastic packaging layer thickness on surface, induction zone 311 is less than the plastic packaging layer thickness on surface, external zones 312.
Described plastic packaging layer 306 for the protection of the external zones 312 of described induction chip 301, conductor wire 302 and substrate 300, and for induction chip 301 being fixed on substrate 300 surface; Meanwhile, described plastic packaging layer 306 also surrounds described conductor wire 302, makes electric isolution between described conductor wire 302 and induction chip 301 or external environment condition.
The summit of described conductor wire 302 is higher than the first surface 310 of described induction chip 301, and the surface of described plastic packaging layer 306 needs the summit higher than described conductor wire 302, to make described plastic packaging layer 306 can wrap up described conductor wire 304 completely.In the present embodiment, described plastic packaging layer 306 surface is 100 microns ~ 150 microns to the distance on surface, induction chip 301 external zones 312.
The material of described plastic packaging layer 306 is polymeric material; Described polymeric material has good pliability, ductility and covering power; Described polymeric material is epoxy resin, polyimide resin, benzocyclobutane olefine resin, polybenzoxazoles resin, polybutylene terephthalate, Merlon, PETG, polyethylene, polypropylene, polyolefin, polyurethane, polyolefin, polyether sulfone, polyamide, polyurethane, ethylene-vinyl acetate copolymer, polyvinyl alcohol or other suitable polymeric materials.
Described plastic packaging layer 306 adopts to turn moulds technique (transfermolding) formation; By injecting the capsulation material of fluid in described plastic packaging space 305, after filling up described plastic packaging space 305, described capsulation material is cured, to form plastic packaging layer 306; After being cured, remove described mould 304 (as shown in Figure 7).
In one embodiment, be also included in substrate 300 surface and form guard ring, described guard ring surrounds described induction chip 301 and plastic packaging layer 306.The material of described guard ring is metal, and described guard ring is by described substrate 300 ground connection, and described guard ring is fixed on the 3rd surface 330 of substrate 300.
Described guard ring is positioned at around described induction chip 301 and plastic packaging layer 305, and part guard ring also to extend to above described plastic packaging layer 306 and exposes surface, induction zone 311.In another embodiment, guard ring is only positioned at induction chip 301 and plastic packaging layer 306 around, and exposes plastic packaging layer 306 surface.
The material of described guard ring is metal, and described metal is copper, tungsten, aluminium, silver or golden.Described guard ring is used for carrying out electrostatic defending to described induction chip 301; Because described guard ring is metal; described guard ring can conduct electricity; easily electrostatic is produced when user's finger is in contact induction district 311; then first electrostatic charge can reach substrate 300 from described guard ring; thus avoid cover plate 303 to be punctured by excessive electrostatic potential, protect induction chip 301 with this, improve the accuracy of fingerprint detection; eliminate the signal noise that induction chip 301 exports, the signal that induction chip is exported is more accurate.
In another embodiment, also comprise the shell being formed and surround described plastic packaging layer 306, induction chip 301 and guard ring, described shell exposes surface, induction zone 301.Described shell can be need to arrange the device of fingerprint recognition chip or the shell of terminal, can also be the shell of the encapsulating structure of described fingerprint recognition chip.
In another embodiment, can also protection of the environment described in wiring layer, and only form the shell surrounding described plastic packaging layer 306 and induction chip 301, described shell exposes surface, induction zone 311.
To sum up; in the present embodiment; by after induction chip is coupled in substrate surface; the plastic packaging layer exposing induction chip induction zone is formed at substrate and part induction chip surface; induction chip and substrate are interfixed by described plastic packaging layer; and while the region that described plastic packaging layer is protected beyond induction chip induction zone, the induction zone of induction chip is exposed completely.Because surface, described induction zone is uncovered, then the finger print information of user can the induction zone of direct sensed chip obtain, and the sensing capability of induction chip can be made to be applied to greatest extent.Therefore, the sensitivity of the encapsulating structure of the fingerprint recognition chip formed gets a promotion.And the method for packing of described fingerprint recognition chip is simple, and manufacturing cost reduces.
Accordingly, the utility model embodiment also provides a kind of encapsulating structure of the fingerprint recognition chip adopting said method to be formed, and please continue to refer to Fig. 8, comprising:
Substrate 300;
Be coupled in the induction chip 301 on described substrate 300 surface, described induction chip 301 has first surface 310 and the second surface 320 relative with first surface 310, the first surface 310 of described induction chip 301 comprises induction zone 311, and the second surface 320 of described induction chip 301 is positioned at substrate 300 surface;
Be positioned at the plastic packaging layer 306 on described substrate 300 and part induction chip 301 surface, described plastic packaging layer 306 exposes described induction zone 301.
Below will be described in detail to said structure.
Described substrate 300 is rigid substrate or flexible base plate.In the present embodiment, described substrate 200 is rigid substrate, and described rigid substrate is PCB substrate, glass substrate, metal substrate, semiconductor substrate or polymeric substrates.
In the present embodiment, described substrate 300 has the 3rd surface 330, and the 3rd surface 330 of described substrate 300 is follow-up for inductive coupling chip.3rd surface 330 of described substrate 300 has wiring layer (not shown) and the second weld pad 331, and described wiring layer is connected with described second weld pad 331, and described second weld pad 331 is for being connected with the chip circuit on induction chip surface.
In one embodiment, form connecting portion in one end of described substrate 300, described connecting portion is used for induction chip is electrically connected with external circuit.The material of described connecting portion comprises electric conducting material, described connecting portion is electrically connected with described wiring layer, enable the chip circuit on described induction chip realize being electrically connected with external circuit or device by the wiring layer on substrate 300 the 3rd surface 330 and connecting portion, transmit the signal of telecommunication with this.
In the present embodiment, described induction chip 301 is made to be fixed on the first surface 350 of substrate 300 described first adhesion layer by the first tack coat.
In the present embodiment, in the induction zone 311 of described induction chip 301, there is the sensing device for obtaining user fingerprints information; Described sensing device comprises capacitance structure or induction structure, makes described induction zone 311 can detect and receive the finger print information of user.
The first surface 310 of described induction chip 301 also comprises the external zones 312 surrounding described induction zone 311.In the induction zone 311 and external zones 312 of described induction chip 301 first surface 310, also have chip circuit, described chip circuit is electrically connected with the sensing device in induction zone 311, and the signal of telecommunication exported for sensing device processes.In the present embodiment, in described induction zone 311, there is at least one capacitor plate.
The first surface 310 of described induction chip 301 also has the first weld pad 313 being positioned at surface, described induction chip external zones 312; Described chip circuit is connected with described first weld pad 313.In the present embodiment, the surface of described induction chip 301 induction zone 311 also has passivation layer, and the material of described passivation layer is insulating material.
Described encapsulating structure also comprises conductor wire 302, and described conductor wire 302 two ends are connected with the second weld pad 331 with the first weld pad 313 respectively, makes described induction chip 301 can realize electrical interconnection with described substrate 300.The material of described conductor wire 302 is metal, and described metal is copper, tungsten, aluminium, gold or silver-colored.
Described conductor wire 304 has to the maximum point of substrate 300 surface distance, the point maximum to substrate 300 surface distance on described conductor wire 304 is summit, and described summit is higher than first surface 310 surface of described induction chip 301.Because described conductor wire 302 is wrapped up by plastic packaging layer 306, therefore, described summit also needs, lower than described plastic packaging layer 306 surface, to make described plastic packaging layer 306 can wrap up described conductor wire 302 completely, to avoid described conductor wire 302 exposed.In the present embodiment, described plastic packaging layer 306 surface is 100 microns ~ 150 microns to the distance on surface, induction chip 301 external zones 312.
In the present embodiment, described plastic packaging layer 306 covers surface, described external zones 312, and exposes surface, described induction zone 311, and user's finger can directly contact with described induction zone 311, and the sensitivity of induction chip is promoted.In other embodiments, surface, described induction zone 311 can have plastic packaging layer and cover, and the plastic packaging layer thickness on surface, induction zone 311 is less than the plastic packaging layer thickness on surface, external zones 312.
Described plastic packaging layer 306 for the protection of the external zones 312 of described induction chip 301, conductor wire 302 and substrate 300, and for induction chip 301 being fixed on substrate 300 surface; Meanwhile, described plastic packaging layer 306 also surrounds described conductor wire 302, makes electric isolution between described conductor wire 302 and induction chip 301 or external environment condition.
The material of described plastic packaging layer 306 is polymeric material; Described polymeric material has good pliability, ductility and covering power; Described polymeric material is epoxy resin, polyimide resin, benzocyclobutane olefine resin, polybenzoxazoles resin, polybutylene terephthalate, Merlon, PETG, polyethylene, polypropylene, polyolefin, polyurethane, polyolefin, polyether sulfone, polyamide, polyurethane, ethylene-vinyl acetate copolymer, polyvinyl alcohol or other suitable polymeric materials.
In one embodiment, be also included in substrate 300 surface and form guard ring, described guard ring surrounds described induction chip 301 and plastic packaging layer 306.The material of described guard ring is metal, and described guard ring is by described substrate 300 ground connection, and described guard ring is fixed on the 3rd surface 330 of substrate 300.Described guard ring is positioned at around described induction chip 301 and plastic packaging layer 305, and part guard ring also to extend to above described plastic packaging layer 306 and exposes surface, induction zone 311.In another embodiment, guard ring is only positioned at induction chip 301 and plastic packaging layer 306 around, and exposes plastic packaging layer 306 surface.The material of described guard ring is metal, and described metal is copper, tungsten, aluminium, silver or golden.
In another embodiment, also comprise the shell being formed and surround described plastic packaging layer 306, induction chip 301 and guard ring, described shell exposes surface, induction zone 301.Described shell can be need to arrange the device of fingerprint recognition chip or the shell of terminal, can also be the shell of the encapsulating structure of described fingerprint recognition chip.
In another embodiment, can also protection of the environment described in wiring layer, and only form the shell surrounding described plastic packaging layer 306 and induction chip 301, described shell exposes surface, induction zone 311.
To sum up, in the present embodiment, described induction chip is coupled in substrate surface, and described substrate and part induction chip surface have the plastic packaging layer exposing induction chip induction zone.Induction chip and substrate can interfix by described plastic packaging layer; And described plastic packaging layer can, while protection induction chip induction zone is with exterior domain, make the induction zone of induction chip be exposed completely.Because surface, described induction zone is uncovered, the finger print information of user can be obtained by direct sensed chip, thus the sensing capability of induction chip is played to greatest extent.Make the sensitivity of described fingerprint recognition chip-packaging structure get a promotion thus, and the manufacturing cost of described fingerprint recognition chip is minimized.
Although the utility model discloses as above, the utility model is not defined in this.Any those skilled in the art, not departing from spirit and scope of the present utility model, all can make various changes or modifications, and therefore protection range of the present utility model should be as the criterion with claim limited range.

Claims (8)

1. an encapsulating structure for fingerprint recognition chip, is characterized in that, comprising:
Substrate;
Be coupled in the induction chip of described substrate surface, described induction chip has first surface and the second surface relative with first surface, and the first surface of described induction chip comprises induction zone, and the second surface of described induction chip is positioned at substrate surface;
Be positioned at the plastic packaging layer on described substrate and part induction chip surface, described plastic packaging layer exposes described induction zone.
2. the encapsulating structure of fingerprint recognition chip as claimed in claim 1, is characterized in that, also comprise: the first surface of described induction chip has the external zones surrounding described induction zone.
3. the encapsulating structure of fingerprint recognition chip as claimed in claim 2, is characterized in that, described plastic packaging layer covers surface, described external zones.
4. the encapsulating structure of fingerprint recognition chip as claimed in claim 2, is characterized in that, also comprise: be positioned at the induction zone of described induction chip and the chip circuit on surface, external zones; Be positioned at first weld pad on surface, described induction chip external zones; Described chip circuit is connected with described first weld pad.
5. the encapsulating structure of fingerprint recognition chip as claimed in claim 4, is characterized in that, also comprise: described substrate has the 3rd surface, and described induction chip is coupled in the 3rd surface of substrate, and the 3rd surface of described substrate has the second weld pad.
6. the encapsulating structure of fingerprint recognition chip as claimed in claim 5, it is characterized in that, also comprise: conductor wire, described conductor wire two ends are connected with the second weld pad with the first weld pad respectively.
7. the encapsulating structure of fingerprint recognition chip as claimed in claim 6, it is characterized in that, described plastic packaging layer surrounds described conductor wire.
8. the encapsulating structure of fingerprint recognition chip as claimed in claim 1, is characterized in that, the surface of described plastic packaging layer is 100 microns ~ 150 microns to the distance on induction chip surface.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104851813A (en) * 2015-05-19 2015-08-19 苏州晶方半导体科技股份有限公司 Fingerprint identification chip packaging structure and packaging method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104851813A (en) * 2015-05-19 2015-08-19 苏州晶方半导体科技股份有限公司 Fingerprint identification chip packaging structure and packaging method
WO2016183975A1 (en) * 2015-05-19 2016-11-24 苏州晶方半导体科技股份有限公司 Chip packaging structure and packaging method

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