CN208538148U - A kind of encapsulating structure of ultra-thin fingerprint recognition chip - Google Patents
A kind of encapsulating structure of ultra-thin fingerprint recognition chip Download PDFInfo
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- CN208538148U CN208538148U CN201821204848.6U CN201821204848U CN208538148U CN 208538148 U CN208538148 U CN 208538148U CN 201821204848 U CN201821204848 U CN 201821204848U CN 208538148 U CN208538148 U CN 208538148U
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- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
The utility model discloses a kind of encapsulating structures of ultra-thin fingerprint recognition chip, belong to fingerprint recognition chip package field.The front of its fingerprint Identification sensor chip (1) is equipped with fingerprint induction identification region (12) and is set to several chip electrodes (14) of side, the positive interconnection metal layer (6) again is distributed in the side of the chip electrode (14) except the positive vertical area of fingerprint induction identification region (12), and it is connect with chip electrode (14), metal connecting piece (5) is set to the side of fingerprint Identification sensor chip (1) and is set to chip electrode (14) side nearby, its top passes through the lower surface of insulating layer (31) through positive interconnection metal layer (6) again, expose encapsulated member (4) in its bottom, the back side again interconnection metal layer (7) one end be arranged soldered ball (71), its other end is connect with the bottom of metal connecting piece (5), the front of fingerprint Identification sensor chip (1) First setting dielectric layer I (35) again on dielectric layer I (35) bonding and wafer thinning composite membrane (9).It is bad that the utility model solves product appearance, improves product yield.
Description
Technical Field
The utility model relates to an ultra-thin fingerprint identification chip's packaging structure belongs to fingerprint identification chip encapsulation field.
Background
Fingerprints are unique characteristics of human bodies, and the fingerprint identification technology is the key of the current biological identification technology. Nowadays, mobile phones become an indispensable part in daily life of people, and due to frequent use times, people feel very inconvenient by repeatedly inputting passwords, and users feel more convenient, faster and safer due to the fingerprint identification system.
However, the reliability performance of the fingerprint identification chip cannot meet the test requirement, and the fingerprint identification chip needs to be packaged for the second time and a composite film is attached to the surface of a fingerprint identification product, so that the fingerprint identification chip can meet the requirements of reliability, ultra-thinness, screen underscreen performance and the like which meet the current mobile phone development trend. Currently, fingerprint packaging is generally adopted in the field of fingerprint identification, but in the actual production process, a large amount of appearance defects, such as Die Mark and Dent (concave-convex points) shown in fig. 1, are found when a composite film is directly pasted on the surface of a fingerprint identification product.
Disclosure of Invention
The utility model discloses mainly not enough to current packaging technology, provided an improve the packaging structure of the bad ultra-thin fingerprint identification chip of outward appearance.
The purpose of the utility model is realized like this:
the utility model relates to an encapsulation structure of an ultrathin fingerprint identification chip, which comprises a fingerprint identification sensor chip and an encapsulation body, wherein the front side of the fingerprint identification sensor chip is provided with a fingerprint induction identification area and a plurality of chip electrodes, the chip electrodes are arranged on one side of the fingerprint induction identification area,
the encapsulation body encapsulates the fingerprint identification sensor chip and the metal connecting pieces, the front surface of the fingerprint identification sensor chip is exposed on the upper surface of the encapsulation body, the front surface of the fingerprint identification sensor chip and the upper surface of the encapsulation body are covered with patterned insulating layers, an insulating layer opening is arranged at the position of the chip electrode, a front surface rewiring metal layer is selectively arranged on the upper surface of the insulating layer, the front surface rewiring metal layer is distributed on one side of the chip electrode outside the vertical area of the front surface of the fingerprint induction identification area and is connected with the chip electrode through the insulating layer opening, the front surface of the fingerprint identification sensor chip is coated with a dielectric layer I, the dielectric layer I covers the front surface rewiring metal layer and the insulating layer, the metal connecting pieces are arranged on one side of the fingerprint identification sensor chip and are arranged nearby the chip electrode and correspond to the number of, the top of the metal layer penetrates through the insulating layer to reach the front surface and then the lower surface of the wiring metal layer is arranged, the bottom of the metal layer is exposed out of the packaging body,
the lower surface of the encapsulating body is provided with a back rewiring metal layer and a back plastic packaging layer, one end of the back rewiring metal layer is provided with a solder ball, the other end of the back rewiring metal layer is connected with the bottom of the metal connecting piece, the metal connecting piece and the back rewiring metal layer are of an integral structure, the back plastic packaging layer covers the back rewiring metal layer, the encapsulating body and the four walls of the dielectric layer I, only the welding surface of the solder ball is exposed, and the front surface of the back plastic packaging layer is flush with the upper surface of the dielectric layer I,
the composite film is arranged on the dielectric layer I, the composite film is in bonding connection with the dielectric layer I and the front side of the back plastic package layer, the composite film comprises a dielectric layer II, a matte base layer and a wear-resistant layer, and the haze of the matte base layer is as follows: 3-5%, transmittance: 95-98%, and the thickness of the composite film is reduced to 20 micrometers +/-2 micrometers.
The metal connecting piece of the utility model is a solid or hollow cylindrical metal object.
The metal connecting piece is a rewiring metal layer.
The material of dielectric layer II is the high dielectric colloid that epoxy, silica and titanium dioxide mix, its thickness 15 microns ~25 microns.
The material of mute light basic unit is PET, its thickness 20 microns ~30 microns.
The hardness of the wear-resistant layer is 2H or 3H.
Fingerprint identification sensor chip is rectangle.
Advantageous effects
The packaging structure of the ultra-thin fingerprint identification chip of the utility model obtains reliable bonding force between the composite film and the plastic package material and between the composite film and the dielectric layer, and the matte base layer solves the problem of bad appearance of the product and improves the yield of the product; the composite film after thinning realizes the ultrathin packaging structure of the fingerprint identification chip, and is combined with the outer wear-resistant layer, so that the reliability and the wear resistance of the packaging structure are enhanced.
Drawings
FIG. 1 is a poor diagram of the package appearance of a prior art fingerprint identification chip;
fig. 2 is a schematic diagram of an embodiment of an ultra-thin fingerprint identification chip package structure according to the present invention;
FIG. 3 is a schematic front view of the metal connector of FIG. 2, illustrating the position relationship between the chip electrode and the sensing element region;
FIG. 4 is a schematic bottom view of the metal connector and the back redistribution metal layer of FIG. 2;
fig. 5 is an appearance effect diagram of the packaging structure of the ultra-thin fingerprint identification chip of the present invention;
wherein,
fingerprint identification sensor chip 1
Chip body 10
Fingerprint sensing identification area 12
Chip electrode 14
Insulating layer 31
Dielectric layer I35
Envelope 4
Metal connecting piece 5
Front surface rewiring metal layer 6
Back surface rewiring metal layer 7
Solder ball 71
Back plastic-sealed layer 78
Composite membrane 9
Dielectric layer II 91
Matte base layer 92
An abrasion resistant layer 93.
Detailed Description
In order to explain the spirit of the present invention in detail and to assist those skilled in the art to understand the technical solution of the present invention practically and completely, the following embodiments and drawings will be used to explain the technical solution of the present invention in detail.
Examples
The utility model relates to an ultra-thin fingerprint identification chip's packaging structure, its fingerprint identification sensor chip 1 is rectangle, its section schematic diagram is shown in fig. 2, the front of fingerprint identification sensor chip 1's chip body 10 is equipped with fingerprint response identification region 12 and a plurality of chip electrode 14, chip electrode 14 sets up in one side of fingerprint response identification region 12, so that fingerprint response identification region 12's effective detection area is big as far as, in the picture with set up in 6 chip electrode 14 of fingerprint response identification region 12 one side and signal, sensing element sets up in fingerprint response identification region 12, its circuit sets up in fingerprint identification sensor chip 1's inside with chip electrode 14's circuit.
The fingerprint sensor chip 1 and the metal connecting piece 5 are encapsulated by an encapsulating material, and the material of the encapsulating material is most commonly epoxy resin, phenolic resin, organic silicon resin and unsaturated polyester resin at present. After the encapsulation and curing of the encapsulating material are completed, the solid encapsulating body 4 can play a role in water resistance, moisture resistance, shock resistance, dust prevention, heat dissipation, insulation and the like. Meanwhile, in order to reduce the problem of the thermal expansion coefficient of the encapsulating material and improve the thermo-mechanical reliability of the structure, fillers such as silicon oxide and silicon nitride are added into the encapsulating material.
The upper surface of the encapsulation 4 exposes the front side of the fingerprint sensor chip 1. The front surface of the fingerprint sensor chip 1 and the upper surface of the encapsulating body 4 are covered with the patterned insulating layer 31, and an insulating layer opening 311 is opened at the chip electrode 14. The insulating layer 31 is made of silicon oxide, silicon nitride, or the like. The front redistribution metal layer 6 is selectively disposed on the upper surface of the insulating layer 31, the front redistribution metal layer 6 is disposed on one side of the chip electrode 14 outside the vertical region of the front surface of the fingerprint sensing identification region 12, and is connected to the chip electrode 14 through the insulating layer opening 311, and the front redistribution metal layer 6 is generally made of copper Cu, iron Fe, nickel Ni, or other materials with good electrical conductivity. The specific number of layers can be set to one or more layers according to the product requirements, and usually, the front rewiring metal layer 6 is a high-density wiring layer, that is, the line width/line distance is below 5 um. The front surface of the fingerprint identification sensor chip 1 is coated with a dielectric layer I35, and the dielectric layer I35 covers the front surface rewiring metal layer 6 and the insulating layer 31.
The metal connecting member 5 is disposed beside the fingerprint sensor chip 1, and the metal connecting member 5 is preferably disposed on the same side of the chip electrode 14 of the fingerprint sensor chip 1. The metal connecting piece 5 is solid or hollow column-shaped and is made of copper Cu, nickel Ni, vanadium V, titanium Ti, palladium Pd, gold Au, silver Ag and the like. Alternatively, the metal connector 5 is a rewiring metal layer and is integrally formed with the back-surface rewiring metal layer 7. The top of the metal connecting piece 5 penetrates through the insulating layer 31 to reach the lower surface of the front rewiring metal layer 6, and is connected with the front rewiring metal layer 6. The number of the metal connecting pieces 5 has no absolute corresponding relation with the number of the chip electrodes 14, and is designed according to actual requirements. In fig. 3, in order to clearly illustrate the connection relationship between the metal connectors 5 and the chip electrodes 14, the number of the metal connectors 5 and the number of the chip electrodes 14 are illustrated in a one-to-one correspondence manner. The bottom of the metal connector 5 is exposed from the enclosure 4.
The lower surface of the package body 4 is provided with a back surface rewiring metal layer 7. The back rewiring metal layer 7 is generally made of metal with good conductivity, such as copper Cu, iron Fe, nickel Ni, and the like. The specific number of layers can be set to one or more layers according to the product requirements, and usually, the back rewiring metal layer 7 is a high-density wiring layer, namely, the line width/line distance is less than 5um, so that the reliability of electricity is improved. One end of the back surface rewiring metal layer 7 is provided with a solder ball 71, and the other end thereof is connected to the bottom of the metal connector 5. The chip electrode on the front side of the fingerprint sensor chip 1 is led to the back side of the fingerprint sensor chip 1 to be conducted with the substrate. Therefore, compare with fingerprint identification sensor packaging structure's prior art, the utility model discloses a this scheme has reduced the vertical space volume that fingerprint identification sensor needs equally to fingerprint identification sensor design has promoted the sensitivity of fingerprint identification sensor contact effectively in the position that is closer to user's finger.
The front coating dielectric layer I35 of above-mentioned fingerprint identification sensor chip 1, the material of dielectric layer I35 is epoxy, the high dielectric colloid of silica and titanium dioxide mixture, its dielectric constant (dielectric constant) DK value requires at 3~8, it has viscidity, can react the solidification after the cooling, it can fill fingerprint identification sensor chip 1 openly, protect fingerprint chip's response sensor face effectively, with the parasitic resistance that reduces circuit structure, electric capacity and inductance, guarantee simultaneously that the circuit has good insulating properties.
And a composite film 9 is arranged on the surface of the dielectric layer I35. Through, the composite film 9 is in bonding connection with the front side of the dielectric layer I35 and the back side plastic package layer 78, and the composite film 9 comprises a dielectric layer II 91, a matte base layer 92 and a wear-resistant layer 93. Dielectric layer II 91's material also is epoxy, the high dielectric colloid of silicon dioxide and titanium dioxide mixture, it can soften under the heating pressurization, have viscidity, can react the solidification after the cooling, its thickness 5 microns ~15 microns, its dielectric constant (dielectric constant) DK value requires 3~8, it can be mutually soluble with dielectric layer I35, make complex film 9 closely laminate, together protect fingerprint chip's response sensor face effectively, with the parasitic resistance that reduces circuit structure, electric capacity and inductance, guarantee simultaneously that the circuit has good insulating properties. The matte base layer 92 is made of PET, the thickness of the PET is 10-15 micrometers, and the PET is a supporting layer of the composite film. The PET material contains atomized particles, and the haze: 3-5%, transmittance: 95-98%, and the diffuse reflection of the light in the matte base material is uniform, so that defects such as concave and convex points, die marks and the like existing in the packaging structure of the whole ultrathin fingerprint identification chip can be shielded. The wear-resistant layer 93 is formed of a wear-resistant polyurethane layer, generally having a thickness of about 5 μm and a hardness of 2H or 3H, and can prevent the composite film 9 from being scratched.
The total thickness of the composite film 9 is controlled within 20 micrometers +/-2 micrometers so as to obtain ultrathin packaging thickness, and meanwhile, the sensitivity and quick response speed of the fingerprint chip are improved.
The back surface plastic package layer 78 covers the back surface rewiring metal layer 7, the package body 4 and the four walls of the dielectric layer I35, only exposes the solder balls 71, and the front surface of the back surface plastic package layer is flush with the upper surface of the dielectric layer I35. After the back surface is polished, the solder balls 71 are exposed out of the soldering surface for connecting with a PCB or a substrate when in use. The material of the back molding layer 78 typically comprises silicon oxide, silicon nitride or resin-based dielectric materials. The positions of the solder balls 71 can be flexibly arranged corresponding to different substrates, and the shapes of the solder balls 71 can also be flexibly designed, generally, the solder balls 71 are arranged in an array shape, the larger the solder balls are, the better the solder balls are, on one hand, convenient for connection, and on the other hand, the solder balls are also one of heat dissipation channels of the packaging structure. According to different solder ball 71 layouts, as shown in fig. 4, the solder balls 71 are shown in a 3 × 2 array arrangement, and the re-wiring metal layer 7 realizes the electrical connection between the solder balls 71 and the metal connecting piece 5 in the most convenient wiring scheme, so as to save the production cost.
The packaging thickness of the under-screen ultrathin fingerprint identification packaging structure is less than 300um, and the packaging structure completely conforms to the development trend.
Above-mentioned packaging structure of ultra-thin fingerprint identification chip can obtain reliable cohesion between the plastic envelope layer of complex film 9 and product, has solved the product outward appearance and has bad, has improved the encapsulation yield of product. As shown in fig. 5, the appearance of the package structure of the ultra-thin fingerprint identification chip was observed without Dent (concave-convex point) and Die Mark (chip print).
The above-mentioned embodiments further describe the objects, technical solutions and advantages of the present invention in detail, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A packaging structure of an ultrathin fingerprint identification chip comprises a fingerprint identification sensor chip (1) and an encapsulating body (4), wherein the front surface of the fingerprint identification sensor chip (1) is provided with a fingerprint induction identification area (12) and a plurality of chip electrodes (14), the chip electrodes (14) are arranged on one side of the fingerprint induction identification area (12),
the method is characterized in that: the fingerprint identification sensor chip comprises an encapsulation body (4), a fingerprint identification sensor chip (1) and a metal connecting piece (5) are encapsulated by the encapsulation body (4), the front surface of the fingerprint identification sensor chip (1) is exposed on the upper surface of the encapsulation body (4), a patterned insulating layer (31) covers the front surface of the fingerprint identification sensor chip (1), an insulating layer opening (311) is formed in the position of a chip electrode (14), a front surface rewiring metal layer (6) is selectively arranged on the upper surface of the insulating layer (31), the front surface rewiring metal layer (6) is distributed on one side of the chip electrode (14) outside a vertical area of the front surface of a fingerprint induction identification area (12) and is connected with the chip electrode (14) through the insulating layer opening (311), a dielectric layer I (35) is coated on the front surface of the fingerprint identification sensor chip (1), and the dielectric layer I (35) covers the front surface rewiring metal layer (6) and the insulating layer, the metal connecting pieces (5) are arranged on one side of the fingerprint identification sensor chip (1) and are arranged nearby the chip electrodes (14), the number of the metal connecting pieces corresponds to that of the chip electrodes (14), the top of the metal connecting pieces penetrates through the insulating layer (31) to reach the lower surface of the front surface of the fingerprint identification sensor chip and then the metal connecting pieces are wired on the metal layer (6), the bottom of the metal connecting pieces is exposed out of the encapsulating body (4),
the lower surface of the encapsulating body (4) is provided with a back rewiring metal layer (7) and a back plastic packaging layer (78), one end of the back rewiring metal layer (7) is provided with a solder ball (71), the other end of the back rewiring metal layer is connected with the bottom of the metal connecting piece (5), the metal connecting piece (5) and the back rewiring metal layer (7) are of an integral structure, the back plastic packaging layer (78) covers the back rewiring metal layer (7), the encapsulating body (4) and the four walls of the dielectric layer I (35) and only exposes the welding surface of the solder ball (71), and the front surface of the back plastic packaging layer is flush with the upper surface of the dielectric layer I (35),
still including setting up complex film (9) on dielectric layer I (35), complex film (9) and dielectric layer I (35), the positive bonding of back plastic envelope layer (78) are connected, complex film (9) include dielectric layer II (91), mute light basic unit (92), wearing layer (93), the haze of mute light basic unit (92): 3-5%, transmittance: 95-98%, and thinning the composite film (9) to 20 microns +/-2 microns.
2. The package structure of the ultra-thin fingerprint identification chip of claim 1, wherein: the metal connecting piece (5) is a solid or hollow cylindrical metal object.
3. The package structure of the ultra-thin fingerprint identification chip of claim 1, wherein: the metal connecting piece (5) is a rewiring metal layer.
4. The package structure of the ultra-thin fingerprint identification chip of claim 1, wherein: the thickness of the dielectric layer II (91) is 15-25 micrometers.
5. The package structure of the ultra-thin fingerprint identification chip of claim 1, wherein: the matte base layer (92) is made of PET, and the thickness of the matte base layer is 20-30 micrometers.
6. The package structure of the ultra-thin fingerprint identification chip of claim 1, wherein: the hardness of the wear-resistant layer (93) is 2H or 3H.
7. The ultra-thin fingerprint identification chip packaging structure of any one of claims 1 to 6, wherein: the fingerprint identification sensor chip (1) is rectangular.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821204848.6U CN208538148U (en) | 2018-07-27 | 2018-07-27 | A kind of encapsulating structure of ultra-thin fingerprint recognition chip |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821204848.6U CN208538148U (en) | 2018-07-27 | 2018-07-27 | A kind of encapsulating structure of ultra-thin fingerprint recognition chip |
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| CN208538148U true CN208538148U (en) | 2019-02-22 |
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| CN201821204848.6U Active CN208538148U (en) | 2018-07-27 | 2018-07-27 | A kind of encapsulating structure of ultra-thin fingerprint recognition chip |
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