CN204029789U - Fingerprint recognition chip-packaging structure - Google Patents
Fingerprint recognition chip-packaging structure Download PDFInfo
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- CN204029789U CN204029789U CN201420361487.1U CN201420361487U CN204029789U CN 204029789 U CN204029789 U CN 204029789U CN 201420361487 U CN201420361487 U CN 201420361487U CN 204029789 U CN204029789 U CN 204029789U
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Classifications
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- 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
- H01L2224/73—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
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- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
A fingerprint recognition chip-packaging structure, encapsulating structure comprises: substrate; Be coupled in the induction chip of substrate surface, described induction chip has first surface and the second surface relative with first surface, and the first surface of described induction chip has induction zone, and the second surface of described induction chip is positioned at substrate surface; Be positioned at the plastic packaging layer on substrate and induction chip surface, described plastic packaging layer is covered in the induction zone surface of induction chip, and the part plastic packaging layer that is positioned at surface, induction zone has preset thickness, and the material of described plastic packaging layer is polymer.Described encapsulating structure can reduce the requirement of induction chip sensitivity, applies more extensive.
Description
Technical field
The utility model relates to technical field of manufacturing semiconductors, relates in particular to a kind of fingerprint recognition chip-packaging structure.
Background technology
Along with the progress of modern society, the importance of person identification and personal information security progressively receives people's concern.Because somatic fingerprint has uniqueness and consistency, make fingerprint identification technology there is fail safe good, reliability is high, and feature easy to use makes fingerprint identification technology be widely used in protecting the various fields of personal information security.And along with scientific and technical development, 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., more outstanding for the demand of Information Security.
The sensing mode of existing fingerprint recognition device comprises condenser type (Electric field) and inductance type, and fingerprint recognition device passes through to extract user fingerprints, and user fingerprints is converted to signal of telecommunication output, thereby obtains user's finger print information.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 surfaces; Be covered in the glass substrate 102 on described fingerprint recognition chip 101 surfaces.
Take capacitance type fingerprint identification chip as example, in described fingerprint recognition chip 101, there are one or more capacitor plates.Epidermis or the hypodermic layer due to user, pointed have protruding ridge and the paddy of depression, when user points the described glass substrate of 103 contact 102 surface, described ridge is different to the distance of fingerprint recognition chip 101 from paddy, therefore, user point 103 ridges or paddy different from the capacitance between capacitor plate, 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, can obtain user's finger print information.
Yet, in existing fingerprint recognition device, the sensitivity of fingerprint recognition chip is had relatively high expectations, the manufacture of fingerprint recognition device and application are restricted.
Utility model content
The problem that the utility model solves is to provide a kind of fingerprint recognition chip-packaging structure, and described encapsulating structure can reduce the requirement of induction chip sensitivity, applies more extensive.
For addressing the above problem, the utility model provides a kind of fingerprint recognition chip-packaging structure, comprising: substrate; Be coupled in the induction chip of substrate surface, described induction chip has first surface and the second surface relative with first surface, and the first surface of described induction chip has induction zone, and the second surface of described induction chip is positioned at substrate surface; Be positioned at the plastic packaging layer on substrate and induction chip surface, described plastic packaging layer is covered in the surface, induction zone of induction chip, the plastic packaging layer being positioned on induction zone has an even surface, and the part plastic packaging layer that is positioned at surface, induction zone has preset thickness, and the material of described plastic packaging layer is polymer.
Optionally, the preset thickness that described plastic packaging layer is positioned at surface, induction zone is 20 microns～100 microns.
Optionally, the margin of tolerance of described preset thickness is in-10%～+ 10%.
Optionally, the first surface of described induction chip also comprises: the external zones that surrounds described induction zone.
Optionally, described induction chip also comprises: be positioned at the edge groove of described external zones, the sidewall of described induction chip exposes described groove; Be positioned at the chip circuit of induction chip external zones, described chip circuit is positioned at the external zones surface of induction chip and sidewall and the lower surface of groove, and is positioned at bottom portion of groove and has the first link, and described chip circuit is connected with the first link.
Optionally, described edge groove is for surrounding the continuous groove of induction zone; Or described edge groove is for surrounding the some discrete groove of induction zone.
Optionally, described substrate has first surface, and described induction chip is coupled in the first surface of substrate, and the first surface of described substrate has the second link.
Optionally, also comprise: conductor wire, described conductor wire two ends are connected with the second link with the first link respectively.
Optionally, also comprise: be positioned at the conductive layer of induction chip sidewall surfaces, substrate first surface and edge groove, described conductive layer two ends are connected with the second link with the first link respectively.
Optionally, also comprise: the first tack coat between induction chip and substrate.
Optionally, described induction chip also comprises: run through the conductive plunger of described induction chip, the second surface of described induction chip exposes described conductive plunger, and one end of described conductive plunger is connected with the first link; Be positioned at the solder layer at the conductive plunger top that induction chip second surface exposes, described solder layer is welded in the second link surface.
Optionally, also comprise: be positioned at the guard ring of substrate surface, described guard ring surrounds described induction chip and plastic packaging layer.
Optionally, the material of described guard ring is metal; Described guard ring is by described substrate ground connection.
Optionally, also comprise: surround the shell of described plastic packaging layer, induction chip and guard ring, described shell exposes the plastic packaging layer on surface, induction zone.
Optionally, also comprise: surround the shell of described plastic packaging layer and induction chip, described shell exposes the plastic packaging layer on surface, induction zone.
Optionally, one end of described substrate has connecting portion, and described connecting portion is used for making induction chip to be electrically connected to external circuit.
Compared with prior art, the technical solution of the utility model has the following advantages:
In encapsulating structure of the present utility model, the second surface of described induction chip is coupled in substrate surface, and the first surface of described induction chip has induction zone, and described induction zone is used for extracting user fingerprints.The plastic packaging layer that is positioned at substrate and induction chip surface is covered in the surface, induction zone of described induction chip, and the plastic packaging layer that is positioned at surface, induction zone can be protected described induction zone.When user's finger is placed in the plastic packaging layer surface on induction zone, can make induction zone extract user fingerprints, and induction chip can be converted to described user fingerprints signal of telecommunication output.Because the material of described plastic packaging layer is polymer, and polymeric material has good ductility and pliability, and covering power is good, therefore, the described thinner thickness that can make plastic packaging layer, and hardness is higher, thus make described plastic packaging layer there is enough large hardness with protection induction chip; Simultaneously, described plastic packaging layer surface reduces to the distance of induction chip, makes induction chip be easy to detect user fingerprints, correspondingly, described encapsulating structure can reduce the requirement to induction chip sensitivity, makes the application of encapsulating structure of fingerprint recognition chip more extensive.
And the material of described plastic packaging layer is polymer, adopt described plastic packaging layer protection induction zone can reduce the manufacturing cost of encapsulating structure.In addition; described plastic packaging layer is also positioned at substrate and the area surfaces of induction chip except induction zone; described plastic packaging layer is used for encapsulating described induction chip; described induction chip is fixed on to substrate surface; described plastic packaging layer can also be protected induction zone simultaneously; for direct and user's finger contacts, therefore described fingerprint recognition chip-packaging structure is simple.
Further, the preset thickness that is positioned at the part plastic packaging layer on surface, induction zone is 20 microns～100 microns.Although it is thinner to be positioned at the plastic packaging layer thickness on surface, induction zone; yet the Mohs' hardness of described plastic packaging layer is more than or equal to 8H; the hardness of described plastic packaging layer is larger; make described plastic packaging layer be enough to protect described induction zone to avoid damage; simultaneously; make induction zone be easy to detect the user fingerprints on contact plastic packaging layer surface, reduced the requirement to induction chip sensitivity.And; the dielectric constant of described plastic packaging layer is more than or equal to 7; the dielectric constant of described plastic packaging layer is larger; make the electric isolation performance of described plastic packaging layer better; make described plastic packaging layer better to the protective capability of induction zone; even if it is thinner to be positioned at the plastic packaging layer thickness on surface, induction zone, also can make user point and induction zone between the capacitance that forms in can be detected in a big way in.
Further, described substrate surface also has the guard ring that surrounds described induction chip and plastic packaging layer.Described guard ring, for described induction chip is carried out to electrostatic defending, avoids the user fingerprints data accuracy that induction zone detects to decline; Described guard ring can also be eliminated the signal noise of induction chip output, makes the signal of data that induction chip detects and output more accurate.
Accompanying drawing explanation
Fig. 1 is the cross-sectional view of a kind of fingerprint recognition device of prior art;
Fig. 2 to Fig. 6 is the schematic diagram of encapsulating structure of the fingerprint recognition chip of the utility model embodiment;
Fig. 7 to Figure 10 is the cross-sectional view of method for packing of a kind of fingerprint recognition chip of the utility model embodiment.
Embodiment
As stated in the Background Art, in existing fingerprint recognition device, the sensitivity of fingerprint recognition chip is had relatively high expectations, the manufacture of fingerprint recognition device and application are restricted.
Through research, find; please continue to refer to Fig. 1; fingerprint recognition chip 101 surface coverage have glass substrate 102; described glass substrate 102 is for the protection of fingerprint recognition chip 101; and user's finger 103 directly contacts with described glass substrate 102; therefore,, in order to guarantee that described glass substrate 102 has enough protective capabilities, the thickness of described glass substrate 102 is thicker.Yet, because the thickness of described glass substrate 102 is thicker, therefore require fingerprint recognition chip 101 to there is higher sensitivity, to guarantee accurately to extract user fingerprints.Yet highly sensitive fingerprint recognition chip manufacturing difficulty is large, manufacturing cost is higher, then causes the application of fingerprint recognition chip and popularization to be restricted.
Concrete, continue to take capacitance type fingerprint recognition means as example, when user's finger puts 103 during in glass substrate 102 surface, user points 103, and fingerprint recognition chip 101 in capacitor plate between can form electric capacity; Wherein, described user points 103 and the capacitor plate the two poles of the earth that are electric capacity, and described glass substrate 102 is the dielectric between electric capacity the two poles of the earth.Yet, because the thickness of described glass substrate 102 is thicker, make user point 103 and capacity substrate between capacitance larger, and that user points 103 ridge and the difference in height between paddy is less, therefore, capacitance between described ridge and capacitor plate, minimum with respect to the difference between the capacitance between described paddy and capacitor plate, in order the difference of described capacitance accurately to be detected, requires described fingerprint recognition chip 101 to have higher sensitivity.
In order to address the above problem, the utility model proposes a kind of encapsulating structure of fingerprint recognition chip.Wherein, in described encapsulating structure, the induction zone surface coverage of induction chip has plastic packaging layer, and the plastic packaging layer on surface, described induction zone has substituted traditional glass substrate, can be directly and user's finger contacts, and for the protection of induction chip.Because the material of described plastic packaging layer is polymer, and polymeric material has good ductility and pliability, can make thinner thickness and the hardness of described plastic packaging layer higher, when described plastic packaging layer is enough to protect induction chip, described plastic packaging layer surface reduced to the distance of induction chip, thereby make induction chip be easy to detect user fingerprints; Correspondingly, described encapsulating structure has reduced the requirement to induction chip sensitivity, makes the application of encapsulating structure of fingerprint recognition chip more extensive.
For above-mentioned purpose of the present utility model, feature and advantage can more be become apparent, below in conjunction with accompanying drawing, specific embodiment of the utility model is described in detail.
Fig. 2 to Fig. 6 is the schematic diagram of encapsulating structure of the fingerprint recognition chip of the utility model embodiment.
Please refer to Fig. 2, the encapsulating structure of described fingerprint recognition chip comprises:
Substrate 200;
Be coupled in the induction chip 201 on substrate 200 surfaces, described induction chip 201 has first surface 210 and the second surface 220 relative with first surface 210, the first surface 210 of described induction chip 201 has induction zone 211, and the second surface 220 of described induction chip 201 is positioned at substrate 200 surfaces;
Be positioned at the plastic packaging layer 203 on substrate 200 and induction chip 201 surfaces, described plastic packaging layer 203 is covered in 211 surfaces, induction zone of induction chip 201, the plastic packaging layer 203 being positioned on induction zone 211 has an even surface, and the part plastic packaging layer 203 that is positioned at 211 surfaces, induction zone has preset thickness, and the material of described plastic packaging layer 203 is polymer.
To the encapsulating structure of above-mentioned fingerprint recognition chip be elaborated below.
Described substrate 200 is for fixing described induction chip 201, and described induction chip 201 is electrically connected to other device or circuit.Described substrate 200 is rigid substrate or flexible base plate, and device or terminal that described induction chip 201 can be set are as required adjusted; 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.
Described substrate 200 has first surface 230, and described induction chip 201 is coupled in the first surface 230 of substrate 200.The first surface 230 of described substrate 200 has wiring layer (not shown), and described wiring layer is connected with the second link 205 that is positioned at substrate 200 first surfaces 230, and described the second link 205 is for being connected with the chip circuit on induction chip 201 surfaces.
In the present embodiment, one end of described substrate 200 has connecting portion 204, the material of described connecting portion 204 comprises electric conducting material, connecting portion 204 is electrically connected to described wiring layer, thereby described chip circuit can be electrically connected to external circuit or device by wiring layer and the connecting portion 204 of substrate 200 first surfaces 230, thereby realize the transmission of the signal of telecommunication.
Be positioned at the induction zone 211 of induction chip 201 first surfaces 210 for detection of the finger print information with receiving user, in described induction zone 211, can have capacitance structure or have induction structure, described capacitance structure or induction structure can be used in the user fingerprints information of obtaining.
In the present embodiment, in described induction zone 211, there is at least one capacitor plate, when user's finger is placed in plastic packaging layer 203 surface on induction zone 211, described capacitor plate, plastic packaging layer 203 and user point formation capacitance structure, and described induction zone 211 can obtain the capacitance difference between user's finger surface ridge and paddy and capacitor plate, and output after described capacitance difference is processed by chip circuit, with this, obtain user fingerprints data.
The first surface 210 of described induction chip 201 also comprises the external zones 212 that surrounds described induction zone 211, the external zones 212 of described induction chip 201 first surfaces 210 has chip circuit (not indicating), described chip circuit is electrically connected to capacitance structure or induction structure in induction zone 211, for the signal of telecommunication of capacitance structure or induction structure output is processed.
Described induction chip 201 also comprises: be positioned at described external zones 212 and have edge groove 206, the sidewall of described induction chip 201 exposes described groove 206; The chip circuit that is positioned at induction chip 201 external zoness 212 is also positioned at sidewall and the lower surface of described groove 206, and be positioned at groove 206 bottoms and there is the first link 207, described chip circuit extends in described groove 206, and is connected with described the first link 207.
Described edge groove 206, is used to form the output of chip circuit, i.e. described the first link 207, by the first link 207 is electrically connected to second link 205 on substrate 200 surfaces, can be realized the coupling of induction chip 201 and substrate 200.
In one embodiment, described edge groove 206 is for surrounding the continuous groove of induction zone 211, and described continuous edge groove 206 lower surface have one or several the first links 207; In another embodiment, the some discrete groove that described edge groove 206 is encirclement induction zone 211, and in each edge groove 206, there are one or several the first links 207.The quantity of described the first link 207 and distribution need design according to the physical circuit wiring of chip circuit.
In the present embodiment, the sidewall of described edge groove 206 is with respect to the surface tilt of induction chip 201, and the sidewall of described edge groove 206 and the angle between bottom are in obtuse angle, edge groove 206 sidewall surfaces of described inclination are easy to form chip circuit, with the wiring between these induction zone 211 to first links 207.
Described plastic packaging layer 203 is positioned at substrate 200 surfaces, and surrounds described induction chip 201, for induction chip being fixed on to substrate 200 surfaces, and for the protection of and isolate described induction chip 201.And described plastic packaging layer 203 is also positioned at 211 surfaces, induction zone of induction chip 201, make described plastic packaging layer 203 for the protection of described induction zone 211, and user's finger can directly contact with the plastic packaging layer 203 on 211 surfaces, described induction zone.Due to described plastic packaging layer 203 for the protection of and fixedly when induction chip 201; can protect the induction zone 211 of induction chip 201, and can point directly and contact with user, therefore; make the encapsulating structure of fingerprint recognition chip of the present embodiment simple, can reduce manufacturing cost.
The material of described plastic packaging layer 203 is polymeric material, described polymeric material has good pliability, ductility and covering power, can make to be positioned at plastic packaging layer 203 thinner thickness on 211 surfaces, induction zone, thereby strengthen the sensing capability of 201 pairs of user's finger prints of induction chip.Meanwhile, by selecting and adjust the kind of described polymeric material, can make the plastic packaging layer 203 that is positioned at 211 surfaces, induction zone there is higher hardness, thereby guarantee that 203 pairs of induction zone 211 of plastic packaging layer have enough protective capabilities.
The preset thickness that is positioned at the plastic packaging layer 203 on 211 surfaces, induction zone is 20 microns～100 microns, described preset thickness is thinner, when user's finger is placed in plastic packaging layer 203 surface on described induction zone 211, described finger is less to the distance of induction zone 211, therefore, induction zone 211 more easily detects the fingerprint of user's finger, thereby has reduced the highly sensitive requirement of induction chip 201.
And the tolerance of described preset thickness need to be controlled in-10%～+ 10% scope, to guarantee to be positioned at plastic packaging layer 203 even thickness on 211 surfaces, induction zone, has then guaranteed that the result that user's finger print is detected is accurate.
In the present embodiment, in described induction zone 211, there is capacitor plate, owing to being positioned at the thinner thickness of the plastic packaging layer 203 on 211 surfaces, induction zone, when user's finger is placed in plastic packaging layer 203 surface on induction zone 211, it is shorter that user points the distance of capacitor plate, and the capacitance between user's finger and capacitor plate is less; Accordingly, the capacitance between the ridge of user's finger surface (projection) and capacity substrate, with respect to the capacitance between paddy (depression) and capacity substrate, differ greatly, therefore, described induction zone 211 is easy to detect the finger print information of user's finger.
And, the tolerance of described preset thickness is in-10%～+ 10%, make to be positioned at plastic packaging layer 203 even thickness on 211 surfaces, induction zone, when detecting the finger print information of user's finger, can stop because of plastic packaging layer 203 difference in thickness cause that user points and capacity substrate between capacitance generation deviation, thereby make the testing result of user fingerprints more accurate.
The Mohs' hardness of described plastic packaging layer 203 is more than or equal to 8H; the hardness of described plastic packaging layer 203 is higher; even if be positioned at plastic packaging layer 203 thinner thickness on 211 surfaces, induction zone; described plastic packaging layer 203 is also enough to protect the induction zone 211 of induction chip 201; when move on plastic packaging layer 203 surface of user's finger on described induction zone 211, can not cause damage to induction chip 201.And, because the hardness of described plastic packaging layer 203 is higher, therefore described plastic packaging layer 203 is difficult to occur deformation, even user's finger presses and described plastic packaging layer 203 surface, the thickness of described plastic packaging layer 203 is also difficult to change, thereby has guaranteed the testing result accuracy of induction zone 211.
The dielectric constant of described plastic packaging layer 203 is more than or equal to 7, and the electric isolating power of described plastic packaging layer 203 is stronger, and the protective capability of 203 pairs of described induction zone 211 of plastic packaging layer that is positioned at 211 surfaces, induction zone is stronger.
In the present embodiment, be positioned at plastic packaging layer 203 thinner thickness on 211 surfaces, induction zone, and capacitance between user finger and capacitor plate and the thickness of described plastic packaging layer 203 are inversely proportional to, be directly proportional to the dielectric constant of plastic packaging layer 203, therefore, when plastic packaging layer 203 thinner thickness on 211 surfaces, induction zone and dielectric constant are when larger, in the scope that capacitance between user finger and capacitor plate can detect in induction zone 211, avoid capacitance excessive or too small and the induction of induction zone 211 was lost efficacy.
And, plastic packaging layer 203 thickness on 211 surfaces, induction zone in 20 microns～100 micrometer ranges, dielectric constant is being more than or equal in 7 scope, the selected material dielectric constant of plastic packaging layer 203 is larger, the thickness that is positioned at the plastic packaging layer 203 on 211 surfaces, induction zone also should corresponding increase, so as user to be pointed and capacitor plate between capacitance can be in a stable and detectable scope in induction zone 211.
The material of described plastic packaging layer 203 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 the present embodiment, fingerprint recognition chip-packaging structure also comprises: conductor wire 208, described conductor wire 208 two ends are connected with the second link 205 with the first link 207 respectively, thereby chip circuit is electrically connected to the wiring layer on substrate 200 surfaces, and described wiring layer is electrically connected to connecting portion 204, thereby make the chip circuit on induction chip 201 surfaces and induction zone 211 carry out the transmission of the signal of telecommunication with external circuit or device.The material of described conductor wire 208 is metal, and described metal is copper, tungsten, aluminium, gold or silver-colored.
In the present embodiment, between the first link 207 and the second link 205, by conductor wire 208, connect, therefore the encapsulating structure of described fingerprint recognition chip also comprises: the first tack coat 301 between induction chip 201 and substrate 200, and for induction chip 201 being fixed on to the first surface 230 of substrate 200.
In the present embodiment, the encapsulating structure of described fingerprint recognition chip also comprises: be positioned at the guard ring 209 on substrate 200 surfaces, described guard ring 209 surrounds described induction chip 20 and plastic packaging layer 203.The material of described guard ring 209 is metal, and described guard ring 209 is by described substrate 200 ground connection, and described guard ring 209 is fixed on the first surface 230 of substrate 200.
In the present embodiment, described guard ring 209 is positioned at around induction chip 201 and plastic packaging layer 203, is covered in part plastic packaging layer 203 top, and exposes the plastic packaging layer 203 on 211 surfaces, induction zone.In another embodiment, guard ring is only positioned at induction chip 201 and plastic packaging layer 203 around, and exposes the surface of plastic packaging layer 203.
The material of described guard ring 209 is metal, and described metal is copper, tungsten, aluminium, silver or golden.Described guard ring 209 is for carrying out electrostatic defending to described induction chip; because described guard ring 209 is metal; described guard ring 209 can conduct electricity; when user's finger produces static when contacting plastic packaging layer 203; first electrostatic charge can reach substrate 200 from described guard ring 209; thereby avoid plastic packaging layer 203 to be punctured by excessive electrostatic potential; with this, protect induction chip 201; improve the accuracy of fingerprint detection; eliminate the signal noise of induction chip output, make the signal of induction chip output more accurate.
In one embodiment, please refer to Fig. 3, the encapsulating structure of fingerprint recognition chip also comprises: the conductive layer 303 that is positioned at induction chip 201 sidewall surfaces, substrate 200 first surfaces 210 and edge groove 206, described conductive layer 303 two ends are connected with the second link 205 with the first link 207 respectively, to realize being electrically connected between induction zone 211 and chip circuit and substrate 200 surface wiring layers.The encapsulating structure of described fingerprint recognition chip also comprises: the first tack coat 301 between induction chip 201 and substrate 200.
In another embodiment, please refer to Fig. 4, in described induction chip 201, also have the conductive plunger 304 that runs through described induction chip 201, the second surface 220 of described induction chip 201 exposes described conductive plunger 304, and one end of described conductive plunger 304 is connected with the first link 207; The solder layer 305 that is positioned at conductive plunger 304 tops that induction chip 201 second surfaces 220 expose, described solder layer 305 is welded in the second link 205 surfaces, make to realize induction zone 211 and chip circuit, with substrate 200 surface wiring layers between be electrically connected to.Because described induction chip 201 is welded in substrate 200 first surfaces 230 by solder layer 305, make described induction chip 201 fixing with respect to substrate 200.
In the present embodiment; please refer to Fig. 5; the encapsulating structure of described fingerprint recognition chip also comprises: the shell 400 that surrounds described plastic packaging layer 203, induction chip 201 and guard ring 209; described shell 400 exposes plastic packaging layer 203 surface on described induction zone 211; user is pointed can touch the plastic packaging layer 203 on 211 surfaces, described induction zone, to carry out fingerprint detection.The solid colour of the color of described plastic packaging layer 203 and described shell 400, for example, when shell 400 colors are black, the color of described plastic packaging layer 203 is black, when shell 400 colors are white, described plastic packaging layer 203 color are white, and the encapsulating structure overall appearance of fingerprint recognition chip is coordinated.
In another embodiment; please refer to Fig. 6; the encapsulating structure of described fingerprint recognition chip does not comprise above-mentioned guard ring 209; the encapsulating structure of described fingerprint recognition chip comprises: the shell that surrounds described plastic packaging layer 203 and induction chip 201; described shell 400 exposes the plastic packaging layer 203 on 211 surfaces, induction zone, the solid colour of the color of described plastic packaging layer 203 and described shell 400.
In the present embodiment, the second surface of described induction chip is coupled in substrate surface, and the first surface of described induction chip has induction zone, and described induction zone is used for extracting user fingerprints.The plastic packaging layer that is positioned at substrate and induction chip surface is covered in the surface, induction zone of described induction chip, and the plastic packaging layer that is positioned at surface, induction zone can be protected described induction zone.When user's finger is placed in the plastic packaging layer surface on induction zone, can make induction zone extract user fingerprints, and induction chip can be converted to described user fingerprints signal of telecommunication output.Because the material of described plastic packaging layer is polymer, and polymeric material has good ductility and pliability, and covering power is good, therefore, the described thinner thickness that can make plastic packaging layer, and hardness is higher, thus make described plastic packaging layer there is enough large hardness with protection induction chip; Simultaneously, described plastic packaging layer surface reduces to the distance of induction chip, makes induction chip be easy to detect user fingerprints, correspondingly, described encapsulating structure can reduce the requirement to induction chip sensitivity, makes the application of encapsulating structure of fingerprint recognition chip more extensive.And the material of described plastic packaging layer is polymer, adopt described plastic packaging layer protection induction zone can reduce the manufacturing cost of encapsulating structure.In addition; described plastic packaging layer is also positioned at substrate and the area surfaces of induction chip except induction zone; described plastic packaging layer is used for encapsulating described induction chip; described induction chip is fixed on to substrate surface; described plastic packaging layer can also be protected induction zone simultaneously; for direct and user's finger contacts, therefore described fingerprint recognition chip-packaging structure is simple.
Accordingly, the utility model embodiment also provides a kind of method for packing that forms above-mentioned fingerprint recognition chip-packaging structure, as shown in Figure 7 to 10.
Please refer to Fig. 7, substrate 200 is provided.
Described substrate 200 is rigid substrate or flexible base plate, and device or terminal that described induction chip 201 can be set are as required adjusted; 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.
Described substrate 200 has first surface 230, and described first surface 230 is for the follow-up induction chip that is coupled.First surface 230 at described substrate 200 forms wiring layer and the second link 205, and described wiring layer is connected with described the second link 205.
In the present embodiment, form connecting portion 204 in one end of substrate 200, the material of described connecting portion 204 comprises electric conducting material, and described wiring layer is connected to described connecting portion 204, thereby wiring layer and the second link 205 can be electrically connected to external circuit or device.
Please refer to Fig. 8, at the fixing induction chip 201 of the first surface 230 of described substrate 200, described induction chip 201 has first surface 210 and the second surface 220 relative with first surface 210, the first surface 210 of described induction chip 201 has induction zone 211, and the second surface 220 of described induction chip 201 is positioned at substrate 200 surfaces.
Described induction chip 201 is for identifying user fingerprints.The induction zone 211 of described induction chip 201 is for responding to user's finger print information, in described induction zone 211, can there is capacitance structure or there is induction structure, for detection of and obtain user fingerprints information, and be converted to signal of telecommunication output.
In the present embodiment, in described induction zone 211, be formed with at least one capacitor plate, when user's finger is placed in plastic packaging layer 203 surface on induction zone 211, described capacitor plate, plastic packaging layer 203 and user point formation capacitance structure, and described induction zone 211 can obtain the capacitance difference between user's finger surface ridge and paddy and capacitor plate, and output after described capacitance difference is processed by chip circuit, with this, obtain user fingerprints data.
Described induction chip 201 also comprises: the external zones 212 that surrounds described induction zone 211.In the external zones 212 of described induction chip 201, be formed with edge groove 206, the sidewall of described induction chip 201 exposes described groove 206; In described groove 206 bottoms, form the first link 207; First surface 210 at induction chip 201 forms chip circuits, and described chip circuit extends in described groove 206, and is connected the output that described the first link 207 is chip circuit with the first link 207.
In one embodiment, described edge groove 206, for surrounding the continuous groove of induction zone 211, forms one or several the first links 207 in described continuous edge groove 206 lower surface.In another embodiment, the some discrete groove that described edge groove 206 is encirclement induction zone 211, and in each edge groove 206, be formed with one or several the first links 207.
In the present embodiment, the sidewall of described edge groove 206 is with respect to the surface tilt of induction chip 201, and the sidewall of described edge groove 206 and the angle between bottom are in obtuse angle.When described edge groove 206 interior formation chip circuit, be easy to carry out photoetching and etching technics to being formed at the chip circuit material on described sloped sidewall surface, with this, form the wiring of chip circuit.
In the present embodiment, described induction chip 201 is fixed on the first surface 230 of substrate 200 by the first tack coat 301, follow-up during by conductor wire or conductive layer the first link 207 be connected with the second articulamentum 205.
In another embodiment, please refer to Fig. 4, the conductive plunger 304 that runs through described induction chip 201 in the interior formation of induction chip 201, the second surface 220 of described induction chip 201 exposes described conductive plunger 304, and one end of described conductive plunger 304 is connected with the first link 207; The solder layer 305 at conductive plunger 304 tops that expose at induction chip 201 second surfaces 220; Described solder layer 305 is welded in to the second link 205 surfaces, makes to interfix between described induction chip 201 and substrate 200.
Please refer to Fig. 9, after induction chip 201 is fixed on to the first surface 210 of substrate 200, make described substrate 200 and induction chip 201 couplings.
In the present embodiment, induction chip 201 is fixed on substrate 200 surfaces by the first tack coat 301, substrate 200 and induction chip 201 couplings in the time of therefore can passing through conductor wire or conductive layer.
In the present embodiment, the method at the surperficial inductive coupling chip 201 of described substrate 200 comprises: conductor wire 208 is provided; Described conductor wire 208 two ends are connected with the second link 205 with the first link 207 respectively by welding procedure.The material of described conductor wire 208 is metal, and described metal is copper, tungsten, aluminium, gold or silver-colored.
In another embodiment, please refer to Fig. 3, method at the surperficial inductive coupling chip 201 of described substrate 200 comprises: the conductive layer 303 in induction chip 201 sidewall surfaces, substrate 200 first surfaces 230 and edge groove 206, described conductive layer 303 two ends are connected with the second link 205 with the first link 207 respectively.The formation technique of described conductive layer 303 comprises: with depositing operation, electroplating technology or chemical plating process, form conducting film; Described in etched portions, conducting film is to form conductive layer 303.The material of described conductive layer 303 is metal, and described metal is one or more in copper, tungsten, aluminium, silver, gold, titanium, tantalum, nickel, titanium nitride, tantalum nitride.
Please refer to Figure 10, at substrate 200 and induction chip 201 surfaces, form plastic packaging layer 203, described plastic packaging layer 203 is covered in 211 surfaces, induction zone of induction chip 201, the plastic packaging layer 203 being positioned on induction zone 211 has an even surface, and the part plastic packaging layer 203 that is positioned at 211 surfaces, induction zone has preset thickness.
The material of described plastic packaging layer 203 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.
The formation technique of described plastic packaging layer 203 is Shooting Technique (injection molding), turns and mould technique (transfer molding) or silk-screen printing technique.The described envelope bed of material 400 can also adopt other suitable technique to form.Described plastic packaging layer 203 is formed at substrate 200 surfaces, surrounds described induction chip 201, and is covered in 211 surfaces, induction zone.Described plastic packaging layer 203 is not only for being fixed on induction chip on substrate 200 surfaces; protect and isolate described induction chip 201; can also be for the protection of described induction zone 211, and user's finger can directly contact with the plastic packaging layer 203 on 211 surfaces, described induction zone.Therefore, the technique of the encapsulating structure of the fingerprint recognition chip of formation the present embodiment is simple, can reduce process time and manufacturing cost.
The preset thickness that is formed at the plastic packaging layer 203 on 211 surfaces, induction zone is 20 microns～100 microns, described preset thickness is thinner, when user's finger is placed in plastic packaging layer 203 surface on described induction zone 211, described finger is less to the distance of induction zone 211, therefore, induction zone 211 more easily detects the fingerprint of user's finger, thereby has reduced the highly sensitive requirement of induction chip 201.And the tolerance of described preset thickness need to be controlled in-10%～+ 10% scope, to guarantee to be positioned at plastic packaging layer 203 even thickness on 211 surfaces, induction zone, has then guaranteed that the result that user's finger print is detected is accurate.
The Mohs' hardness of described plastic packaging layer 203 is more than or equal to 8H.The hardness of described plastic packaging layer 203 is higher; even if be positioned at plastic packaging layer 203 thinner thickness on 211 surfaces, induction zone; described plastic packaging layer 203 is also enough to protect the induction zone 211 of induction chip 201; when move on plastic packaging layer 203 surface of user's finger on described induction zone 211, can not cause damage to induction chip 201.
The dielectric constant of described plastic packaging layer 203 is more than or equal to 7, and the electric isolating power of described plastic packaging layer 203 is stronger, and the protective capability of 203 pairs of described induction zone 211 of plastic packaging layer that is positioned at 211 surfaces, induction zone is stronger.
In the present embodiment, after forming encapsulated layer 203, can also form guard ring 209 on substrate 200 surfaces, described guard ring 209 surrounds described induction chip 201 and plastic packaging layer 203.The material of described guard ring 209 is metal, and described guard ring 209 is by described substrate 200 ground connection.The material of described guard ring 209 is metal, and described metal is copper, tungsten, aluminium, silver or golden.
In the present embodiment, be formed at the plastic packaging layer on substrate and induction chip surface for encapsulating described induction chip.Because the material of described plastic packaging layer is polymer, polymeric material has good ductility and pliability, and covering power is good, can make to be formed at that the plastic packaging layer thickness on surface, induction zone is thin and hardness is high, formed plastic packaging layer has enough large hardness with protection induction chip; And described plastic packaging layer surface reduces to the distance of induction chip, makes induction zone more easily obtain user fingerprints data, formed encapsulating structure reduces the requirement of induction chip sensitivity, and the scope of application of described method for packing is more extensive.And, because described plastic packaging layer can be protected induction zone in encapsulation induction chip, the method that encapsulates induction chip is simplified.
Although the utility model discloses as above, the utility model is not defined in this.Any those skilled in the art, within 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 (16)
1. a fingerprint recognition chip-packaging structure, is characterized in that, comprising:
Substrate;
Be coupled in the induction chip of substrate surface, described induction chip has first surface and the second surface relative with first surface, and the first surface of described induction chip has induction zone, and the second surface of described induction chip is positioned at substrate surface;
Be positioned at the plastic packaging layer on substrate and induction chip surface, described plastic packaging layer is covered in the surface, induction zone of induction chip, the plastic packaging layer being positioned on induction zone has an even surface, and the part plastic packaging layer that is positioned at surface, induction zone has preset thickness, and the material of described plastic packaging layer is polymer.
2. fingerprint recognition chip-packaging structure as claimed in claim 1, is characterized in that, the preset thickness that described plastic packaging layer is positioned at surface, induction zone is 20 microns～100 microns.
3. fingerprint recognition chip-packaging structure as claimed in claim 2, is characterized in that, the margin of tolerance of described preset thickness is in-10%～+ 10%.
4. fingerprint recognition chip-packaging structure as claimed in claim 1, is characterized in that, the first surface of described induction chip also comprises: the external zones that surrounds described induction zone.
5. fingerprint recognition chip-packaging structure as claimed in claim 4, is characterized in that, described induction chip also comprises: be positioned at the edge groove of described external zones, the sidewall of described induction chip exposes described groove; Be positioned at the chip circuit of induction chip external zones, described chip circuit is positioned at the external zones surface of induction chip and sidewall and the lower surface of groove, and is positioned at bottom portion of groove and has the first link, and described chip circuit is connected with the first link.
6. fingerprint recognition chip-packaging structure as claimed in claim 5, is characterized in that, described edge groove is for surrounding the continuous groove of induction zone; Or described edge groove is for surrounding the some discrete groove of induction zone.
7. fingerprint recognition chip-packaging structure as claimed in claim 5, is characterized in that, described substrate has first surface, and described induction chip is coupled in the first surface of substrate, and the first surface of described substrate has the second link.
8. fingerprint recognition chip-packaging structure as claimed in claim 7, is characterized in that, also comprises: conductor wire, described conductor wire two ends are connected with the second link with the first link respectively.
9. fingerprint recognition chip-packaging structure as claimed in claim 7, it is characterized in that, also comprise: be positioned at the conductive layer of induction chip sidewall surfaces, substrate first surface and edge groove, described conductive layer two ends are connected with the second link with the first link respectively.
10. fingerprint recognition chip-packaging structure as claimed in claim 8 or 9, is characterized in that, also comprises: the first tack coat between induction chip and substrate.
11. fingerprint recognition chip-packaging structures as claimed in claim 7, it is characterized in that, described induction chip also comprises: run through the conductive plunger of described induction chip, the second surface of described induction chip exposes described conductive plunger, and one end of described conductive plunger is connected with the first link; Be positioned at the solder layer at the conductive plunger top that induction chip second surface exposes, described solder layer is welded in the second link surface.
12. fingerprint recognition chip-packaging structures as claimed in claim 1, is characterized in that, also comprise: be positioned at the guard ring of substrate surface, described guard ring surrounds described induction chip and plastic packaging layer.
13. fingerprint recognition chip-packaging structures as claimed in claim 12, is characterized in that, the material of described guard ring is metal; Described guard ring is by described substrate ground connection.
14. fingerprint recognition chip-packaging structures as claimed in claim 12, is characterized in that, also comprise: surround the shell of described plastic packaging layer, induction chip and guard ring, described shell exposes the plastic packaging layer on surface, induction zone.
15. fingerprint recognition chip-packaging structures as claimed in claim 1, is characterized in that, also comprise: surround the shell of described plastic packaging layer and induction chip, described shell exposes the plastic packaging layer on surface, induction zone.
16. fingerprint recognition chip-packaging structures as claimed in claim 1, is characterized in that, one end of described substrate has connecting portion, and described connecting portion is used for making induction chip to be electrically connected to external circuit.
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| CN201420361487.1U CN204029789U (en) | 2014-07-01 | 2014-07-01 | Fingerprint recognition chip-packaging structure |
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| CN201420361487.1U CN204029789U (en) | 2014-07-01 | 2014-07-01 | Fingerprint recognition chip-packaging structure |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104051368A (en) * | 2014-07-01 | 2014-09-17 | 苏州晶方半导体科技股份有限公司 | Packaging structure and packaging method for fingerprint recognition chip |
| CN106158808A (en) * | 2015-03-25 | 2016-11-23 | 恒劲科技股份有限公司 | Electronic packing piece and preparation method thereof |
| WO2016183978A1 (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 |
| CN106897712A (en) * | 2017-03-13 | 2017-06-27 | 广东欧珀移动通信有限公司 | Fingerprint module, display screen and mobile terminal |
| CN111133444A (en) * | 2019-10-21 | 2020-05-08 | 深圳市汇顶科技股份有限公司 | Fingerprint identification device and electronic equipment |
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2014
- 2014-07-01 CN CN201420361487.1U patent/CN204029789U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104051368A (en) * | 2014-07-01 | 2014-09-17 | 苏州晶方半导体科技股份有限公司 | Packaging structure and packaging method for fingerprint recognition chip |
| WO2016000598A1 (en) * | 2014-07-01 | 2016-01-07 | 苏州晶方半导体科技股份有限公司 | Fingerprint recognition chip packaging structure and packaging method |
| US10108837B2 (en) | 2014-07-01 | 2018-10-23 | China Wafer Level Csp Co., Ltd. | Fingerprint recognition chip packaging structure and packaging method |
| CN106158808A (en) * | 2015-03-25 | 2016-11-23 | 恒劲科技股份有限公司 | Electronic packing piece and preparation method thereof |
| CN106158808B (en) * | 2015-03-25 | 2019-11-08 | 恒劲科技股份有限公司 | Electronic packing piece and its preparation method |
| WO2016183978A1 (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 |
| CN106897712A (en) * | 2017-03-13 | 2017-06-27 | 广东欧珀移动通信有限公司 | Fingerprint module, display screen and mobile terminal |
| CN111133444A (en) * | 2019-10-21 | 2020-05-08 | 深圳市汇顶科技股份有限公司 | Fingerprint identification device and electronic equipment |
| CN111133444B (en) * | 2019-10-21 | 2023-10-13 | 深圳市汇顶科技股份有限公司 | Fingerprint identification device and electronic equipment |
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