CN103679163A - Novel capacitance type fingerprint image acquisition system - Google Patents
Novel capacitance type fingerprint image acquisition system Download PDFInfo
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- CN103679163A CN103679163A CN201210345176.1A CN201210345176A CN103679163A CN 103679163 A CN103679163 A CN 103679163A CN 201210345176 A CN201210345176 A CN 201210345176A CN 103679163 A CN103679163 A CN 103679163A
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Abstract
The invention provides a novel capacitance type fingerprint image acquisition system which comprises a sensing element array, a sensing element array driving circuit, an insulating surface, a comparator array, a programmable reference voltage source and a self-adaptive process algorithm logic circuit, wherein the sensing element array comprises a plurality of sensing elements; the sensing element array driving circuit is used for inputting voltage signals to the sensing element array; the insulating surface covers on the sensing element array and is used as a contact surface of fingers; the comparator array is configured beside the sensing element array and output of the sensing element array is used as the input of the comparator array; the programmable reference voltage source is used as input reference voltage of the comparator array; the self-adaptive process algorithm logic circuit is used for adjusting the programmable reference voltage source in a self-adaptive manner. By adopting the system provided by the invention, the sensitivity of a capacitance sensor can be improved, so that clear fingerprint images of dry, wet, oily and normal fingers can be acquired, and the system is applicable to acquisition of special fingerprint.
Description
Technical field
The present invention relates to integrated circuit (IC) design field, relate in particular to a kind of novel capacitance-type Fingerprint Vision Gathering System that is applicable to special finger collection.
Background technology
High speed development along with automatic electronic design, the authentication of living body biological feature and identification more and more apply in people's life, finger print identifying, as have high reliability and cost performance in biological characteristic authentication, has become the main flow of current biological identification.Meanwhile, fingerprint collecting technology is high speed development also, and one more low-cost, and more the sensor of small size will capture huge market, and the sensor therefore with above-mentioned advantage becomes the emphasis of current research.Wherein capacitance type sensor becomes one of current main-stream product.
Ripe gradually along with fingerprint technique, and cost is more and more lower, believes that fingerprint identification technology can be applied to our daily life widely.Meanwhile, also more and more higher to the requirement of sensor.A good fingerprint recognition system, is not only from algorithm and solves the deficiency existing in fingerprint recognition system, more should fundamentally solve the image quality issues that sensor collects, and makes some special finger can both collect fingerprint image clearly.Existing capacitance type sensor is by utilizing charge sharing principle to realize, utilize compared with the past capacitor charge and discharge principle to come the structure of sensing small electric capacitance to be significantly improved, as Chinese patent numbering ZL02105960.8, a kind of capacitance type fingerprint access chip is provided, comprise capacitance sensing element array and the class dynamic RAM DRAM peripheral circuit with two-dimensional approach, arranged, this type of sensing array utilizes the charge sharing principle of DRAM to detect line peak and the line paddy of fingerprint.The sensing element structure of this existing capacitance type sensor can not be eliminated background capacitance, and (sensing electrode is to the stray capacitance of its electrode, comprise that sensing electrode is to reference electrode, sensing electrode is to the stray capacitance of substrate etc., and may there is inconsistency in the stray capacitance of each sensing), the scale-of-two that its sensing output signal obtains by a comparer or A/D converter or the image information of gray level, only by changing the reference capacitance value of sensing or changing the quality that mask capacitor current potential big or small and that connect carrys out coarse adjustment fingerprint image, for finger too wet or too oil, there is collect image blurring unclear in the method, for finger dry and fracture, the too shallow or basic resolution of the image lines that can't collect fingerprint lines, cause special finger application to be restricted, if collect unsharp fingerprint image simultaneously, to subsequent fingerprint, process and identify and affect
Summary of the invention
The present invention, in order to address the above problem, provides a kind of follow-on capacitance type fingerprint image capturing system, and the reference voltage by the comparer that improves sensing circuit and sensing output signal is passed through carries out self-adaptation adjustment on the basis of existing technology.
The invention provides a kind of novel capacitance-type Fingerprint Vision Gathering System, comprise a sensing array, comprise a plurality of sensings; One sensing array drive circuit, for to sensing array input voltage signal; One insulating surface, is covered on this sensing array, as the surface of contact of a finger; One comparator array, is disposed at by this sensing array, and the output of sensing array is inputted as it; One programmable reference voltage source, as a comparison an input reference voltage of device array; One adaptive process algorithm logic circuit, regulates programmable reference voltage source for self-adaptation; It is characterized in that, sensing array connects and is transfused to one first voltage signal, makes reference capacitance two ends or sense capacitance two ends in this each sensing produce a voltage difference; Input afterwards a second voltage signal, make reference capacitance two ends and mask capacitor two ends no-voltage poor, or sense capacitance two ends and mask capacitor two ends no-voltage poor; Then input a tertiary voltage signal, make guarded electrode be linked to a voltage, make this sense capacitance, this mask capacitor and this reference capacitance carry out disconnecting after charge share linking of this reference capacitance and this sense capacitance and this mask capacitor again; Order repeat to input the second, tertiary voltage signal, until there is upset again by the energizing signal output of each comparer, as the gray level image information collecting in comparer.
Each sensing also comprises: a sensor construction, comprising: a sensing electrode, forms sense capacitance with finger, insulating surface;
Two reference electrodes; And an insulation course, be disposed between two reference electrodes, and can form reference capacitance between two reference electrodes and insulation course; One guarded electrode and be disposed at guarded electrode and sensing electrode between an insulation course, between guarded electrode, insulation course and sensing electrode, form mask capacitor; And a plurality of on-off circuits.
Adaptive process algorithm logic circuit real-time analysis comparator array input gray level fingermark image information wherein, exports a feedback signal afterwards for regulating the reference voltage level of comparator array.
The domain structure of a plurality of sensings is as follows:
Last layer of metal, as sensing electrode, to counting second layer metal as guarded electrode, thereby is eliminated background capacitance for isolated other circuit, between the insulation course between this double layer of metal and this double layer of metal, forms mask capacitor; The guarded electrode of each sensing is sequentially divided into polylith, and wherein two, edge connects constant voltage, makes the edge stray capacitance between each sensing identical, and remaining piece is connected on variable voltage source, by sensing driving circuit, is driven.
The present invention is according to charge sharing principle, by self-adaptation, adjust the reference voltage of the comparer that sensing output signal passes through, improve existing sensing array and carry out the detection of capacitance, this system can increase the sensitivity of capacitive transducer, can make to do, wet, oil, and normally finger can both collect fingerprint image clearly, is more applicable for the collection of some special finger.Adaptive process algorithm is realized by DLC (digital logic circuit).
The present invention separately provides a kind of domain structure of sensing, makes the charge share consistance (consistance of each sensing stray capacitance) of hundreds of thousands of sensings, further improves the quality of fingerprint output image.
Accompanying drawing explanation
Fig. 1 is capacitance type fingerprint acquisition system schematic diagram of the present invention;
Fig. 2 is the sensing element structure schematic diagram of the capacitance type fingerprint acquisition system of the embodiment of the present invention;
Fig. 3 is the sensing domain structure schematic diagram of the capacitance type fingerprint acquisition system of the embodiment of the present invention;
Fig. 4 is the dry finger print image that capacitance type fingerprint acquisition system of the present invention collects, and wherein Fig. 4 a does not adjust the image that comparator reference magnitude of voltage collects; Fig. 4 b adjusts the image that comparator reference magnitude of voltage collects.
Fig. 5 is the wet finger print image that capacitance type fingerprint acquisition system of the present invention collects, and wherein Fig. 5 a does not adjust the image that comparator reference magnitude of voltage collects; Fig. 5 b adjusts the image that comparator reference magnitude of voltage collects.
Symbol description in figure:
1 fingerprint acquisition system
10 sensing arrays
11 sensing array drive circuits
The programmable comparator array of 12 input reference voltage
The programmable comparer of 121 input reference voltage
13 adaptive process algorithm logic circuit
14 programmable reference voltage sources
2 fingers
20 sensing electrodes
201 sense capacitance
202 reference capacitances
203a, 203b, 203c, 203d, 203e, 203e mask capacitor
301302303304a 304b 305a 305b 306a 306b switch
401402403404a 404b 405a 405b 406a 406b voltage source
5 nodes
Embodiment
The invention provides a kind of capacitance type fingerprint image capturing system, comprise: a sensing array, comprises a plurality of sensings; One sensing array drive circuit; One insulating surface, is covered on this sensing array, as the surface of contact of a finger; One comparator array, is disposed at by this capacitance sensing element array, and the output of sensing array is inputted as it; One programmable reference voltage source, as a comparison an input reference voltage of device array; One adaptive process algorithm logic circuit, regulates programmable reference voltage source for self-adaptation.This sensing array is transfused to one first voltage signal, makes the reference capacitance two ends in this each sensing produce a voltage difference; Input afterwards a second voltage signal, make sense capacitance two ends and mask capacitor two ends no-voltage poor; Then input a tertiary voltage signal, make guarded electrode be linked to a certain voltage, make this sense capacitance, this mask capacitor and this reference capacitance carry out disconnecting again after charge share linking of this reference capacitance and this sense capacitance and this mask capacitor; Order repeat to input the second, tertiary voltage signal, until there is upset again using the energizing signal output of each comparer as the gray level image information collecting in comparer.
This output signal feeds back to a signal for regulating programmable reference voltage source after being input to adaptive process algorithm logic processing of circuit, and this process of iterative cycles, until export pair fingerprint image clearly.
According to one embodiment of the invention, this capacitance type fingerprint image capturing system, comprises: a sensing array, a sensing array drive circuit, an insulating surface, a comparator array, a programmable reference voltage source and an adaptive process algorithm logic circuit; Wherein sensing array comprises a plurality of sensings, each sensing: also comprise a sensor construction, comprise a sensing electrode, two reference electrodes and be disposed at an insulation course, the guarded electrode between reference electrode and be disposed at guarded electrode and sensing electrode between an insulation course, a plurality of on-off circuit.
Wherein, insulating surface is covered on sensing array, as a finger contact face; Finger, insulating surface and sensing electrode can form sense capacitance, between two reference electrodes and insulation course, can form reference capacitance, between guarded electrode, insulation course and sensing electrode, can form mask capacitor; A plurality of switches complete the charge share of capacitance sensing unit under the effect of sensing array drive circuit; Wherein sensing array drive circuit input one first voltage signal, makes the reference capacitance two ends in this each sensing produce a voltage difference (or sense capacitance two ends produce voltage difference); Input afterwards a second voltage signal, make sense capacitance two ends (or reference capacitance two ends) and mask capacitor two ends no-voltage poor; Then input a tertiary voltage signal, make guarded electrode be linked to a certain voltage, make this sense capacitance, this mask capacitor and this reference capacitance carry out disconnecting after charge share linking of this reference capacitance and this sense capacitance and this mask capacitor again; Order repeat to input the second, tertiary voltage signal, until there is upset again using the energizing signal output of each comparer as the gray level image information collecting in comparer.
According to another embodiment of the present invention, the domain structure of this sensing is as follows:
Last layer of metal, as sensing electrode, to counting second layer metal as guarded electrode, thereby is eliminated background capacitance for isolated other circuit, and the insulation course between this double layer of metal and this double layer of metal forms mask capacitor.The guarded electrode of each sensing is sequentially divided into polylith, and wherein two, edge connects constant voltage, makes the edge stray capacitance between each sensing identical, and remaining piece is connected on variable voltage source, by sensing driving circuit, is driven.
Originally be in embodiment, each sensing guarded electrode is divided into 5 fritter A, B, C, D, E, and wherein A, E connect constant voltage, make the edge stray capacitance between each sensing roughly the same, B, C, D are connected on variable voltage source, by sensing driving circuit, are driven.By the variable voltage source that regulates B, C, D to link, can obtain a kind of sensing of best sensitivity.Reference capacitance and on-off circuit are placed under this double layer of metal.This domain structure makes the charge share consistance (consistance of each sensing stray capacitance) of hundreds of thousands of sensings, further improves the quality of fingerprint output image.
Be different from other capacitance type fingerprint image capturing systems, the present invention improves collection image quality by improving circuit structure and the domain structure thereof of sensing, regulates a programmable comparer of input reference voltage to realize the collection to special finger by an adaptive algorithm process simultaneously.No matter be gather normal fingerprint or gather special fingerprint, by the programmable comparer of adjustment input reference voltage of real-time adaptive, thereby the output fingermark image quality of adjustment comparer can both collect fingerprint image more clearly.
Referring to Fig. 1, it is capacitance type fingerprint acquisition system schematic diagram of the present invention.This fingerprint acquisition system 1 comprises: a sensing array 10, comprises a plurality of sensings 101, for detection of finger surface and the formed sense capacitance of sensing electrode; Sensing array drive circuit 11, for to sensing array input voltage signal; The programmable comparator array 12 of one input reference voltage, comprises a plurality of comparers 121, and the output of sensing is converted to scale-of-two gray level fingermark image information; One adaptive process algorithm logic circuit 13, for real-time analysis input scale-of-two gray level fingermark image information wherein, exports a feedback signal afterwards for regulating the reference voltage level of comparator array 12; One programmable reference voltage source 14, the as a comparison input of device array 12.
Referring to Fig. 2, it is the structural representation of one of them sensing of embodiment of the present invention capacitance type fingerprint acquisition system.This sensing comprises: a sense capacitance 201, by finger 2, sensing electrode 20 and the formed electric capacity of insulating surface 21; One reference capacitance 202; A plurality of mask capacitor 203a, 203b, 203c, 203d, 203e; A plurality of switches 301,302,303,304a, 304b, 305a, 305b, 306a, 306b; A plurality of voltage sources 401,402,403,404a, 404b, 405a, 405b, 406a, 406b; When finger 2 contact sensings unit surperficial 21, sensing array drive circuit 11 can input one first voltages, and switch 303 cuts out, and reference capacitance 202 is charged to a certain magnitude of voltage, as VDD, and rear cut-off switch 303.Sensing array drive circuit 11 is inputted second voltages afterwards, make switch 301,304a, 305a, 306a closes, switch 304b, 305b, 306b disconnects, making the electric charge on sensing electrode is to disconnect and close 301 after zero (if the both end voltage of sense capacitance and mask capacitor is zero), 304a, 305a, 306a.Then input a tertiary voltage, switch 302,304b, 305b, 306b are closed, electric capacity 203b, 203c, 203d are linked on a certain voltage, as VDD, and cut-off switch 302,304b, 305b, 306b after sense capacitance, reference capacitance and mask capacitor generation charge share.Repeat to input after second, third voltage several, until the voltage drop of reference capacitance 202, to the reference voltage level of comparer, reverses comparer.Finally the output of comparer is imported into real-time adaptive process algorithm logic circuit 13, adaptive process algorithm logic circuit 13 feeds back to a digital signal for regulating programmable reference voltage source 14.No matter be normal finger or special finger, after this fingerprint acquisition system, can export width fingerprint image clearly.
In addition, repeat to input after the certain number of times of second, third voltage, the net charge that can make mask capacitor 203a, 203b, 203c, 203d, 203e contribute to node 5 is zero, thereby eliminates the impact of background capacitance.
Referring to Fig. 3, it is the domain of the sensing of embodiment of the present invention capacitance type fingerprint acquisition system, by double layer of metal, formed, last layer of metal (102) is as sensing electrode, to counting second layer metal (101) as guarded electrode, thereby for isolated other circuit, eliminate background capacitance, 101,102 and this double layer of metal between insulation course form mask capacitor.Each sensing guarded electrode is divided into 5 (101a, 101b, 101c, 101d, 101e), 101a wherein, 101e connects constant voltage, makes the edge stray capacitance between each sensing roughly the same, 101b, 101c, 101d is connected on variable voltage, by sensing driving circuit, is driven.By regulating 101b, 101c, the variable voltage that 101d links can obtain a kind of sensing of best sensitivity.Reference capacitance and on-off circuit are placed under this double layer of metal.This domain structure makes the charge share consistance (consistance of each sensing stray capacitance) of hundreds of thousands of sensings, further improves the quality of fingerprint output image.
Referring to Fig. 4 and Fig. 5, wherein Fig. 4 a figure is that conventional condenser acquisition system collects the resulting fingerprint image of dry finger, look the too shallow very difficult identification of fingerprint lines, Fig. 4 b is the fingerprint image that capacitance type fingerprint acquisition system of the present invention regulates the programmable comparator array of input reference voltage to obtain by real-time adaptive process algorithm circuit, looks high-visible.Fig. 5 a figure is that conventional condenser acquisition system collects the resulting fingerprint image of wet finger, look the smudgy very difficult identification of fingerprint lines, Fig. 5 b figure is the fingerprint image that capacitance type fingerprint acquisition system of the present invention regulates the programmable comparator array of input reference voltage to obtain by real-time adaptive process algorithm circuit, looks high-visible.
Those skilled in the art is not departing under the condition of the definite the spirit and scope of the present invention of claims, can also carry out various modifications to above content.Therefore scope of the present invention is not limited in above explanation, but determined by the scope of claims.
Claims (4)
1. novel capacitance-type Fingerprint Vision Gathering System, comprises
One sensing array, comprises a plurality of sensings;
One sensing array drive circuit, for to sensing array input voltage signal;
One insulating surface, is covered on this sensing array, as the surface of contact of a finger;
One comparator array, is disposed at by this sensing array, and the output of sensing array is inputted as it;
One programmable reference voltage source, as a comparison an input reference voltage of device array;
One adaptive process algorithm logic circuit, regulates programmable reference voltage source for self-adaptation;
It is characterized in that, sensing array connects and is transfused to one first voltage signal, makes reference capacitance two ends or sense capacitance two ends in this each sensing produce a voltage difference; Input afterwards a second voltage signal, make reference capacitance two ends and mask capacitor two ends no-voltage poor, or sense capacitance two ends and mask capacitor two ends no-voltage poor; Then input a tertiary voltage signal, make guarded electrode be linked to a voltage, make this sense capacitance, this mask capacitor and this reference capacitance carry out disconnecting after charge share linking of this reference capacitance and this sense capacitance and this mask capacitor again; Order repeat to input the second, tertiary voltage signal, until there is upset again by the energizing signal output of each comparer, as the gray level image information collecting in comparer.
2. novel capacitance-type Fingerprint Vision Gathering System according to claim 1, is characterized in that, each sensing also comprises:
One sensor construction, comprising:
One sensing electrode, forms sense capacitance with finger, insulating surface;
Two reference electrodes; And
One insulation course, is disposed between two reference electrodes, and can form reference capacitance between two reference electrodes and insulation course;
One guarded electrode and be disposed at guarded electrode and sensing electrode between an insulation course, between guarded electrode, insulation course and sensing electrode, form mask capacitor; And
A plurality of on-off circuits.
3. novel capacitance-type Fingerprint Vision Gathering System according to claim 1, it is characterized in that, adaptive process algorithm logic circuit real-time analysis comparator array input gray level fingermark image information wherein, exports a feedback signal afterwards for regulating the reference voltage level of comparator array.
4. novel capacitance-type Fingerprint Vision Gathering System according to claim 2, is characterized in that, the domain structure of a plurality of sensings is as follows:
Last layer of metal is as sensing electrode, and layer metal second from the bottom be as guarded electrode, thereby eliminates background capacitance for isolated other circuit, between the insulation course between this double layer of metal and this double layer of metal, forms mask capacitor; The guarded electrode of each sensing is sequentially divided into polylith, and wherein two, edge connects constant voltage, makes the edge stray capacitance between each sensing identical, and remaining piece is connected on variable voltage source, by sensing driving circuit, is driven.
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| CN108256407B (en) * | 2017-01-05 | 2023-08-04 | 广州市晶密电子有限公司 | Method and device for jointly collecting and identifying fingerprints by using multiple sensors |
| CN108256407A (en) * | 2017-01-05 | 2018-07-06 | 广州市晶密电子有限公司 | A kind of method and its device with multiple sensors Collect jointly and identification fingerprint |
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| CN108985136B (en) * | 2017-06-02 | 2021-08-24 | 旭景科技有限公司 | Noise reduction capacitive image sensor and operation method thereof |
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| CN107832706A (en) * | 2017-11-09 | 2018-03-23 | 深圳市晓控通信科技有限公司 | A kind of identification with functions/drying accurately capacitance type fingerprint identification equipment |
| CN107832706B (en) * | 2017-11-09 | 2021-10-22 | 深圳市蓝海经略科技有限公司 | Accurate capacitanc fingerprint identification equipment of discernment with drying function |
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