CN103810479A - Fingerprint collection system and fingerprint information collection method - Google Patents
Fingerprint collection system and fingerprint information collection method Download PDFInfo
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- CN103810479A CN103810479A CN201410072586.2A CN201410072586A CN103810479A CN 103810479 A CN103810479 A CN 103810479A CN 201410072586 A CN201410072586 A CN 201410072586A CN 103810479 A CN103810479 A CN 103810479A
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Abstract
The invention relates to a fingerprint collection system comprising a fingerprint sensor, a scanning controller, a sensing unit driving circuit, an image output unit and a mode control circuit. The fingerprint sensor comprises a fingerprint sensing unit array, an antenna metal frame and a radiofrequency driving circuit; the fingerprint sensing unit array includes multiple sensing units, and the radiofrequency driving circuit drives the antenna metal frame to transmit radiofrequency signals. The scanning controller is used for selecting at least part of the sensing units of the fingerprint sensing unit array to serve as effective sensing units for sensing fingerprints and converting the same into electric signals. The sensing unit driving circuit is used for providing time-sequence signals needed for work of the effective sensing units. The image output unit is used for converting electric signals into digital fingerprint image information and outputting the information. The mode control circuit is used for controlling the sensing unit driving circuit to send different time-sequence signals to change working modes of the fingerprint collection system. The working modes at least include a capacitive collection mode and a radiofrequency collection mode. The fingerprint collection system has wide application range and has good collection and recognition effects in various application fields.
Description
Technical field
The present invention relates to fingerprint collecting technical field.Especially, the present invention relates to a kind of fingerprint acquisition system and finger print information acquisition method.
Background technology
Along with people are more and more higher to the requirement of information security, the authentication of living body biological feature and identification more and more apply in daily life.Finger print identifying, as have very high reliability and cost performance in biological characteristic authentication, has become the main flow of current biological identification.Meanwhile, also high speed development of fingerprint collecting technology, more low cost, more the fingerprint sensor of small size, more low-power consumption and high dynamic range will capture huge market, the fingerprint sensor therefore with above-mentioned advantage becomes the emphasis of current research, and wherein capacitive fingerprint sensing device becomes one of current main product.
Along with the maturation gradually of fingerprint sensing technology, advanced fingerprint sensing technology is applied in cell phone and other electronic products gradually, and Chinese third generation I.D. need to be registered finger print information, fingerprint identification technology can be applied to our daily life very soon and widely, meanwhile, more and more higher to the requirement of fingerprint sensor.A good fingerprint recognition decorum, not only should solve the deficiency that software in fingerprint sensor or hardware aspect exist, more should in the time being applied to special occasions or in the time that special finger occurs, fingerprint image clearly can both be collected, and the deception of prosthetic finger can be effectively refused.
Existing fingerprint sensor adopts pure capacitive fingerprint sensor mostly, and the residual impact comparatively speaking of its fingerprint residues and other pollutions is very large, has a strong impact on the identification to fingerprint.As a kind of technical scheme in prior art provides a kind of capacitance type fingerprint reading manner, wherein the direct contact surface of finger is only to have the mineral compound of several um to form by thickness to the insulation course between the sensing electrode of sensing array, thereby causes its hydrophobicity, anti-residual, crushing resistance and antistatic property extreme difference.In existing external fingerprint sensor, only AUTHENTEC and FPC Liang Ge company have realized RF-type fingerprint collecting, and the basic homology of RF-type acquisition principle of Gai Liangge company, RF-type fingerprint collecting can good anti-fingerprint residues and other pollutions residual, but in the stronger application scenario of some radio-frequency radiation, its antijamming capability is poor, thereby range of application is limited.
As shown in Figure 1, a kind of fingerprint acquisition system of the prior art, its sensing cell 10 comprises: a sense capacitance 11, is formed with sensing electrode by finger 1, one edge capacitance 12, is formed by the output electrode of sensing electrode and amplifier 13, one amplifier 13, one input ends are connected between sense capacitance 11 and edge capacitance 12, an input end grounding, and output terminal connects edge capacitance 12 other ends, this sensing cell 10 by detect sent by radiofrequency signal 14 through pointing the radiofrequency signal of 1 reflection, this signal after capacitance integral amplifying circuit by the processing of subsequent conditioning circuit (not shown), the radiofrequency signal of different amplitudes detected according to the difference of sense capacitance value, thereby realize fingerprint collecting, this system is because each sensing cell 10 uses an amplifier 13, process deviation between each amplifier is difficult to proofread and correct, increase the complicacy that circuit is realized, and the corresponding pixel of a radio-frequency (RF) pulse signal or multiple Pixel Information of this system, disturb stronger place to be easier to be interfered in radio-frequency radiation.
Above-mentioned existing fingerprint sensor, no matter be capacitive or the fingerprint sensor of RF-type is all the fingerprint detection mode of single-mode, all can not be applied in neatly different places, and can not well refuse the deception of special prosthetic finger model.If prosthetic finger model is plated to layer of conductive material or semiconductive material and assurance to be plated Fingerprint Model fingerprint valley line degree of depth of model in the time being subject to pressing after material and is greater than the concrete numerical value of 2um(and is determined by the sensitivity of sensor), this special prosthetic finger model be can out-trick existing fingerprint sensor detection (although this its manufacturing process of prosthetic finger model is quite complicated, its cost is very high, utilizes the checking of out-tricking of this special prosthetic finger model but do not get rid of unique people).
Therefore, those skilled in the art expect to obtain one can resisting remaining fingerprint or other pollutions residual, anti-electromagnetic-radiation, thereby and the deception of refusal prosthetic finger improve the fingerprint acquisition system of security of system.
Summary of the invention
The object of the present invention is to provide a kind of fingerprint acquisition system, it has wider range of application, and security is better.
For achieving the above object, the invention provides a kind of technical scheme as follows:
A kind of fingerprint acquisition system, comprising: fingerprint sensor, and it comprises fingerprint sensing cell array, antenna metal frame and radio-frequency (RF) driver circuit, fingerprint sensing cell array comprises multiple sensing cells, radio-frequency (RF) driver circuit driven antenna metal frame emitting radio frequency signal, scanning monitor, for selecting at least a portion sensing cell of fingerprint sensing cell array as effective feeling measurement unit, for sensing finger fingerprint and be converted to electric signal, one sensing cell driving circuit, for providing the work of each effective feeling measurement unit required clock signal, one image output unit, for converting the electrical signal to digital information in fingerprint output, one mode control circuit, sends different clock signals and changes the mode of operation of fingerprint acquisition system for controlling sensing cell driving circuit, wherein, mode of operation at least comprises: condenser type drainage pattern and RF-type drainage pattern, wherein, RF-type drainage pattern is: mode control circuit is opened radio-frequency (RF) driver circuit, radio-frequency (RF) driver circuit makes antenna metal frame to collected finger emitting radio frequency signal, finger skin corium reflected radio signal, sensing cell driving circuit is exported a series of charge/discharge clock signal to effective feeling measurement unit simultaneously, make effective feeling measurement unit realize the conversion of finger print to electric signal under the excitation of the radiofrequency signal of a series of charge/discharge clock signals and the reflection of finger skin corium, condenser type drainage pattern is: mode control circuit is closed radio-frequency (RF) driver circuit, antenna metal frame is connected to ground or ESD circuit, sensing cell driving circuit is exported a series of charge/discharge clock signal to effective feeling measurement unit, makes effective feeling measurement unit under the excitation of a series of charge/discharge clock signals, realize the conversion of finger print to electric signal.
Preferably, image output unit comprises an ADC array and a shift register, fingerprint sensor detects the capacitance between each effective feeling measurement unit and finger line by line, ADC array converts the electrical signal to digital signal line by line, and the shift register line by line digital signal of buffer memory ADC array output also exports external data interface line by line to.
Preferably, each sensing cell at least comprises: a sensing electrode, at least one gain electrode, at least one reference electrode are to, on-off circuit and sensing cell control circuit, at least one reference electrode is to being formed as respectively the two poles of the earth of at least one reference capacitance, sensing electrode with press on finger type on sensing electrode and become the two poles of the earth of a sense capacitance, sensing electrode and at least one gain electrode are formed as respectively the two poles of the earth of at least one gain capacitances, and sensing cell control circuit is by the charge/discharge state of the following multiple electric capacity of on-off circuit control: sense capacitance; At least one reference capacitance; And, at least one gain capacitances.
Preferably, fingerprint sensor also comprises a prosthetic finger detecting electrode, prosthetic finger detecting electrode detects the current value that flows through this detecting electrode, and calculate the phase differential of the radiofrequency signal that the radiofrequency signal that senses and antenna metal frame send on this detecting electrode, whether be prosthetic finger for definite object pressing on finger contact face.
The present invention also provides a kind of finger print information acquisition method, comprises the following steps: sensing cell driving circuit is exported the first pulse signal to effective feeling measurement unit; This first pulse signal is the reference capacitance charging to effective feeling measurement unit during pulse width, makes reference capacitance two ends accumulate a fixing quantity of electric charge; Sensing cell driving circuit is exported the second pulse signal to effective feeling measurement unit; The second pulse signal discharges to the sense capacitance of effective feeling measurement unit with the radiofrequency signal of finger skin corium reflection, and the quantity of electric charge at its two ends is reduced; The second pulse signal drives the fractionated gain electrode of effective feeling measurement unit to reach the first current potential, drives all the other gain electrodes of effective feeling measurement unit to reach the second current potential simultaneously; Sensing cell driving circuit output the 3rd pulse signal is to effective feeling measurement unit; The 3rd pulse signal makes reference capacitance, sense capacitance and the gain capacitances generation equalizing charge in effective feeling measurement unit with the radiofrequency signal of finger skin corium reflection, thereby the quantity of electric charge at reference capacitance two ends is reduced; The second pulse signal and the 3rd pulse signal that sensing cell driving circuit is exported a fixed cycles number of times arrive effective feeling measurement unit, radio-frequency (RF) driver circuit is exported the radio-frequency (RF) pulse signal of identical fixed cycles number of times to antenna metal frame, and the second pulse signal of this fixed cycles number of times and the 3rd pulse signal make the voltage difference at the reference capacitance two ends of effective feeling measurement unit reduce gradually with the radiofrequency signal of the identical fixed cycles number of times of finger skin corium reflection jointly; After fixed cycles number of cycles finishes, the voltage difference at reference capacitance two ends is locked, and ADC array converts this voltage differential signal to fingerprint image gray-scale value, and this fingerprint image gray-scale value is input in shift register, forms digital information in fingerprint output.
Fingerprint acquisition system provided by the invention, for different application scenarios, change the mode of operation of fingerprint acquisition system with mode control circuit, for example comprise, carry out resisting remaining fingerprint or other pollutions are residual with radio-frequency (RF) acquisition mode of operation, resist the stronger application scenario of electromagnetic radiation with condenser type collecting work pattern, in addition, thereby above-mentioned fingerprint acquisition system can effectively be refused prosthetic finger, deception improves security of system.Thereby fingerprint acquisition system provided by the invention and finger print information acquisition method have wider range of application, and in each application scenario, gather with recognition effect good.
Accompanying drawing explanation
Fig. 1 illustrates the structural representation of the sensing cell of a fingerprint sensor in prior art;
Fig. 2 illustrates the fingerprint sensor chip structural representation of one embodiment of the invention;
Fig. 3 illustrates the sensing cell array peripheral circuit schematic diagram of above-mentioned fingerprint sensor chip;
Fig. 4 illustrates the structural representation of sensing cell in above-described embodiment;
Fig. 5 a illustrates the dry finger print image that in prior art, condenser type drainage pattern collects;
Fig. 5 b illustrates the dry finger print image that fingerprint acquisition system of the present invention collects;
Fig. 5 C illustrates the wet finger print image that in prior art, condenser type drainage pattern collects;
Fig. 5 D illustrates the wet finger print image that fingerprint acquisition system of the present invention collects.
Embodiment
In the following detailed description, the preferred embodiments of the present invention have only been described by reference to the accompanying drawings.But should be understood that in the situation that not departing from inventive concept and can make various deformation designs.
As shown in Figure 2, one embodiment of the invention provides a kind of fingerprint acquisition system, and it is formed on a chip structure, on this chip, comprises: fingerprint sensor, mode control circuit 21, scanning monitor 22, sensing cell driving circuit 23 and image output unit.Wherein, fingerprint sensor comprises fingerprint sensing cell array 20, antenna metal frame (not shown in Fig. 2) and radio-frequency (RF) driver circuit 29, fingerprint sensing cell array 20 comprises multiple sensing cells 201, radio-frequency (RF) driver circuit 29 driven antenna metal frame emitting radio frequency signals; Scanning monitor 22 selects at least a portion sensing cell 201 in fingerprint sensing cell array 20 as effective feeling measurement unit, for sensing finger fingerprint and be converted to electric signal; Sensing cell driving circuit 23 provides each effective feeling measurement unit 201 required clock signal of working; Image output unit is used for converting the electrical signal to digital information in fingerprint output; Mode control circuit 21 sends different clock signals and changes the mode of operation of fingerprint acquisition system for controlling sensing cell driving circuit 23.
Particularly, image output unit comprises an ADC array 24 and a shift register 25, ADC array 24 comprises multiple ADC unit 241, fingerprint sensor detects the capacitance between each effective feeling measurement unit 201 and finger line by line, ADC array 24 converts the electrical signal to digital signal line by line, shift register 25 digital signal that buffer memory ADC array 24 is exported line by line, exports external data interface subsequently line by line to.
Automatic gain control circuit 26 can be controlled the programmable reference voltage source 27 of input control ADC array 24 and the gain of each effective feeling measurement unit 201, so that fingerprint acquisition system can be applicable to multiple occasion, and promotes fingerprint collecting effect.Gather timing sequence generating and image data read control circuit 28 and be connected with mode control circuit 21, ADC array 24, automatic gain control circuit 26 and radio-frequency (RF) driver circuit respectively, provide chip operation required clock signal to them; Gather the output that timing sequence generating and image data read control circuit 28 also receive shift register 25 and prosthetic finger testing circuit 291, to transfer to external data interface.
Wherein, mode control circuit 21(is directly or through scanning monitor 22 transfers) control sensing cell driving circuit 23 and send different clock signals and change the mode of operation of fingerprint acquisition system, mode of operation at least comprises: condenser type drainage pattern and RF-type drainage pattern, RF-type drainage pattern at least comprise rely on finger skin corium the reflection of radiofrequency signal is controlled to effective feeling measurement unit 201, so that finger print is converted to electric signal; In condenser type drainage pattern, sensing cell driving circuit 23 is exported a series of charge/discharge clock signals and is encouraged effective feeling measurement unit 2-1, so that finger print is converted to electric signal.
Particularly, under RF-type drainage pattern: mode control circuit 21 is opened radio-frequency (RF) driver circuit 29, radio-frequency (RF) driver circuit 29 makes antenna metal frame to finger emitting radio frequency signal to be collected, finger skin corium reflects this radiofrequency signal, sensing cell driving circuit 23 is exported a series of charge/discharge clock signal to effective feeling measurement unit 201 simultaneously, makes to realize the conversion of finger print to electric signal under the excitation of radiofrequency signal of a series of charge/discharge clock signals that each effective feeling measurement unit 201 exports at sensing cell driving circuit 23 and the reflection of finger skin corium.
Under condenser type drainage pattern, mode control circuit 21 is closed radio-frequency (RF) driver circuit 29, antenna metal frame is connected to ground or ESD circuit, sensing cell driving circuit 23 is exported a series of charge/discharge clock signal to effective feeling measurement unit 201, and effective feeling measurement unit 201 is realized the conversion of finger print to electric signal under the excitation of this series of charge/discharge clock signal.
Further, according to above-described embodiment, a kind of hybrid drainage pattern also can be provided, under hybrid drainage pattern, first mode control circuit 21 sends the first control signal to sensing cell driving circuit 23, control sensing cell driving circuit 23 and send the first clock signal so that fingerprint acquisition system works under RF-type drainage pattern, fingerprint sensor has judged whether finger contact fingerprint sensor, if, mode control circuit 21 sends the second control signal to sensing cell driving circuit 23, control sensing cell driving circuit 23 and send the second clock signal so that fingerprint acquisition system works under condenser type drainage pattern, at this moment, fingerprint acquisition system detects finger print according to the variation of electric capacity between sensing cell 201 and finger.
As shown in Figure 3, according to a kind of embodiment of above-described embodiment, prosthetic finger testing circuit 291 shown in Fig. 2, can be connected with prosthetic finger detecting electrode 321, prosthetic finger detecting electrode 321 detects the current value that flows through this detecting electrode 321, and calculate the phase differential of the radiofrequency signal 33 that the radiofrequency signal that senses and antenna metal frame 32 send on this detecting electrode 321, be prosthetic finger or the finger of fingerprint to be collected 30 for definite object pressing on finger contact face 31.Wherein, one passivation insulation is directly covered on the fingerprint sensing cell array 20 shown in Fig. 2, on passivation insulation, also cover a polyester complexes insulation course, it is formed as finger contact face 31, between antenna metal frame 32 and prosthetic finger detecting electrode 321, is also provided with megohmite insulant 322.
The prosthetic finger detection mode realizing with this prosthetic finger testing circuit 291 and detecting electrode 321 can effectively prevent the deception of the prosthetic finger that fidelity is higher, thereby improves the security performance of system.
As shown in Figure 4, in above-described embodiment, in fingerprint sensing cell array 20, each sensing cell 201 comprises: the sensing electrode 401 that formed by the top-level metallic of integrated circuit technology, by the layer of metal of other level of integrated circuit technology or multiple gain electrodes 41 that multiple layer metal forms, a reference electrode to, multiple on-off circuit 421,422,423,424 and sensing cell control circuit 45 and radio-frequency (RF) driver circuit.Wherein, reference electrode to and electrode pair in the middle of insulation course be formed as reference capacitance 43; Sensing electrode 401 tops are equipped with sense capacitance insulation course, passivation insulation on its top-level metallic that comprises integrated circuit technology and polyester complexes insulation course, sensing electrode 401 is formed as sense capacitance 40 with finger and the sense capacitance insulation course pressed thereon; Gain electrode 41 is multiple, a part of gain electrode is connected with a set potential, all the other gain electrodes connect respectively the sensing cell control circuit 45 of each sensing cell 201, part switch in on-off circuit 421,422,423,424 under radio-frequency (RF) acquisition pattern in controllable state, under electric capacity drainage pattern in off state.The transmitting of radio-frequency (RF) driver circuit control radiofrequency signal 33.
Further, gain electrode 41 is five, be respectively first, second, third, fourth and fifth gain electrode, first, second, third, fourth and fifth gain electrode is formed as respectively two electrodes of first, second, third, fourth and fifth gain capacitances with sensing electrode, wherein, the first gain electrode is connected with direct voltage source 441 positive poles, the second gain electrode is connected with these direct voltage source 441 negative poles, and the 3rd, the 4th is connected with sensing cell control circuit 45 respectively with the 5th gain electrode.On-off circuit 422,424 is also connected with direct voltage source 442,443 respectively.Thereby sensing cell control circuit 45 is controlled the charge/discharge of each sense capacitance, each reference capacitance and each gain capacitances by on-off circuit 421,422,423,424.
According to embodiments of the invention, the mode of operation of fingerprint acquisition system at least comprises: condenser type drainage pattern and RF-type drainage pattern.
In RF-type drainage pattern, finger print specifically comprises to the conversion of electric signal: sensing cell driving circuit 23 is exported the first pulse signal to effective feeling measurement unit 201, this first pulse signal reference capacitance 43 to effective feeling measurement unit 201 during pulse width charges, make reference capacitance 43 two ends accumulate a fixing quantity of electric charge, sensing cell driving circuit 23 is exported the second pulse signal to effective feeling measurement unit 201 afterwards, the radiofrequency signal that this second pulse signal and finger (skin corium) reflect reduces the quantity of electric charge at sense capacitance 40 two ends of effective feeling measurement unit 201, these the second pulse signal drive part gain electrode 41 to first current potentials, drive all the other gain electrode 41 to second current potentials simultaneously, sensing cell driving circuit 23 is exported the 3rd pulse signal to effective feeling measurement unit 201 afterwards, meanwhile the 3rd pulse signal makes the reference capacitance 43 in effective feeling measurement unit 201 with the radiofrequency signal that finger reflects, sense capacitance 40 and gain capacitances are carried out equalizing charge, the quantity of electric charge at reference capacitance 43 two ends is reduced, sensing cell driving circuit 23 is exported the second pulse signal of a fixed cycles number of times and the 3rd pulse signal to effective feeling measurement unit 201 afterwards, radio-frequency (RF) driver circuit is exported the radio-frequency (RF) pulse signal of identical fixed cycles number of times to antenna metal frame, the second pulse signal of this fixed cycles number of times and the 3rd pulse signal make the voltage difference at reference capacitance 43 two ends of effective feeling measurement unit 201 successively reduce with the radiofrequency signal of the identical fixed cycles number of times of finger skin corium reflection jointly, it is locked that circulation finishes the voltage difference at rear reference capacitance 43 two ends, meanwhile ADC array 24 converts this voltage differential signal to fingerprint image gray-scale value, this fingerprint image gray-scale value is input to shift register 25, complete effective feeling measurement unit 201 conversion to electric signal to finger print.
Wherein, above-mentioned fixed cycles number of times is a fuzzy amount, and in actual applications according to the difference of the figure place of ADC array, this fixed cycles number of times is just different, and it can be 2 n power conventionally, and wherein n is more than or equal to 4 positive integer.
For example, when ADC is 8 in actual applications, when this fixed cycles number of times just equals 256, ADC and is 9, this fixed cycles number of times just equals 512.
In condenser type drainage pattern, finger print specifically comprises to the conversion of electric signal: sensing cell driving circuit 23 is exported the first pulse signal to effective feeling measurement unit 201, this first pulse signal reference capacitance 43 to effective feeling measurement unit 201 during pulse width charges, make reference capacitance 43 two ends accumulate a fixing quantity of electric charge, sensing cell driving circuit 23 is exported the second pulse signal to effective feeling measurement unit 201 afterwards, the quantity of electric charge at sense capacitance 40 two ends of this second pulse enable signal effective feeling measurement unit 201 reduces, this the second pulse signal drive part gain electrode 41 is to a certain current potential, drive all the other gain electrode 41 to second current potentials simultaneously, sensing cell driving circuit 23 is exported the 3rd pulse signal to effective feeling measurement unit 201 afterwards, the meanwhile reference capacitance 43 in the 3rd pulse enable signal effective feeling measurement unit 201, sense capacitance 40 and gain capacitances are carried out equalizing charge, the quantity of electric charge at reference capacitance 43 two ends is reduced, sensing cell driving circuit 23 is exported the second pulse signal of fixed cycles number of times and the 3rd pulse signal to effective feeling measurement unit 201 afterwards, the voltage difference at reference capacitance 43 two ends of effective feeling measurement unit 201 is successively reduced, it is locked that circulation finishes the voltage difference at rear reference capacitance 43 two ends, meanwhile ADC array 24 converts this voltage differential signal to fingerprint image gray-scale value, this fingerprint image gray-scale value is input to shift register 25, complete effective feeling measurement unit 201 conversion to electric signal to finger print.
The fingerprint acquisition system that above-described embodiment provides, for different application scenarios, change the mode of operation of fingerprint acquisition system with mode control circuit, carry out resisting remaining fingerprint or other pollutions are residual with radio-frequency (RF) acquisition mode of operation, resist the stronger application scenario of electromagnetic radiation with condenser type collecting work pattern, thereby there is wider range of application, and in each application scenario, gather with recognition effect good.
Fig. 5 A, Fig. 5 B illustrate respectively the dry finger print image collecting under condenser type drainage pattern, with the dry finger print image collecting with fingerprint acquisition system of the present invention; Fig. 5 C, Fig. 5 D illustrate respectively the wet finger print image collecting under condenser type drainage pattern, with the wet finger print image collecting with fingerprint acquisition system of the present invention.
Another embodiment of the present invention provides a kind of finger print information acquisition method, and it can be realized based on above fingerprint acquisition system, and this acquisition method comprises the steps:
A), mode of operation configuration step, be used to fingerprint acquisition system configuration effort pattern;
B), detect and have or not finger contact in the fingerprint sensor of fingerprint acquisition system;
If c) have, detect the variation of electric capacity between each effective feeling measurement unit and finger and be output as electric signal;
D), convert electrical signals to digital signal;
E), digital signal is consisted of to digital fingerprint image output;
Wherein, mode of operation at least comprises condenser type drainage pattern and RF-type drainage pattern, and their definition, working mechanism are identical with previous embodiment.
Further, mode of operation also comprises hybrid drainage pattern, under this pattern, under this pattern, first send the first control signal to sensing cell driving circuit, control sensing cell driving circuit and send the first clock signal so that above-mentioned fingerprint acquisition system works under RF-type drainage pattern, fingerprint sensor has judged whether finger contact, if, send the second control signal to sensing cell driving circuit, control sensing cell driving circuit and send the second clock signal so that above-mentioned fingerprint acquisition system works under condenser type drainage pattern, fingerprint acquisition system detects finger print according to the variation of electric capacity between sensing cell and finger.
Further, step c) specifically comprises: detect from top to bottom or from top to bottom line by line the variation of electric capacity between each effective feeling measurement unit and finger, and the electric capacity detecting is converted to analog electrical signal; Steps d) specifically comprise: convert the electrical signal to line by line digital signal; Step e) specifically comprises: buffer memory digital signal line by line, after a complete fingerprint image of composition, export.
Further embodiment of this invention provides a kind of finger print information acquisition method, realizes equally based on above fingerprint acquisition system, and particularly, it comprises the following steps:
Sensing cell driving circuit is exported the first pulse signal to effective feeling measurement unit;
This first pulse signal is the reference capacitance charging to effective feeling measurement unit during pulse width, makes reference capacitance two ends accumulate a fixing quantity of electric charge;
Sensing cell driving circuit is exported the second pulse signal to effective feeling measurement unit;
The second pulse signal discharges to the sense capacitance of effective feeling measurement unit with the radiofrequency signal of finger skin corium reflection, and the quantity of electric charge at its two ends is reduced;
The gain electrode of the second pulse signal drive part sensing cell reaches the first current potential, and drives the gain electrode of remaining sensing cell to reach the second current potential;
Sensing cell driving circuit output the 3rd pulse signal is to effective feeling measurement unit;
The 3rd pulse signal makes reference capacitance, sense capacitance and the gain capacitances generation equalizing charge in effective feeling measurement unit with the radiofrequency signal of finger skin corium reflection, thereby the quantity of electric charge at reference capacitance two ends is reduced; That is to say that voltage difference reduces;
The second pulse signal and the 3rd pulse signal that sensing cell driving circuit is exported a fixed cycles number of times arrive effective feeling measurement unit, radio-frequency (RF) driver circuit is exported the radio-frequency (RF) pulse signal of identical fixed cycles number of times to antenna metal frame, and the second pulse signal of this fixed cycles number of times and the 3rd pulse signal make the voltage difference at the reference capacitance two ends of effective feeling measurement unit reduce gradually with the radiofrequency signal of the identical fixed cycles number of times of finger skin corium reflection jointly;
After fixed cycles number of cycles finishes, the voltage difference at reference capacitance two ends is locked, and ADC array converts this voltage differential signal to fingerprint image gray-scale value, and this fingerprint image gray-scale value is input in shift register, forms digital information in fingerprint output.
Further, the n power that wherein fixed cycles number of times is 2, wherein n is more than or equal to 4 positive integer.
Above-mentioned fingerprint collecting method has wider range of application, and in each application scenario, gathers with recognition effect good.
Although shown in the present invention preferred embodiment, those of ordinary skill in the art can understand, and based on thought of the present invention, can make various interchangeable and/or equivalent deformation designs, and not deviate from scope of the present invention.
Claims (8)
1. a fingerprint acquisition system, comprising:
Fingerprint sensor, it comprises fingerprint sensing cell array, antenna metal frame and radio-frequency (RF) driver circuit, and described fingerprint sensing cell array comprises multiple sensing cells, and described radio-frequency (RF) driver circuit drives described antenna metal frame emitting radio frequency signal;
Scanning monitor, for selecting at least a portion sensing cell of described fingerprint sensing cell array as effective feeling measurement unit, for finger print described in sensing and be converted to electric signal;
One sensing cell driving circuit, for providing the work of each described effective feeling measurement unit required clock signal;
One image output unit, for converting described electric signal to digital information in fingerprint output;
One mode control circuit, sends different clock signals and changes the mode of operation of described fingerprint acquisition system for controlling described sensing cell driving circuit;
Wherein, described mode of operation at least comprises: condenser type drainage pattern and RF-type drainage pattern, wherein,
Described RF-type drainage pattern is:
Described mode control circuit is opened described radio-frequency (RF) driver circuit, described radio-frequency (RF) driver circuit makes described antenna metal frame to collected finger emitting radio frequency signal, finger skin corium reflects described radiofrequency signal, described sensing cell driving circuit is exported a series of charge/discharge clock signal to described effective feeling measurement unit simultaneously, makes described effective feeling measurement unit realize the conversion of described finger print to electric signal under the excitation of the radiofrequency signal of described a series of charge/discharge clock signals and the reflection of described finger skin corium;
Described condenser type drainage pattern is:
Described mode control circuit is closed described radio-frequency (RF) driver circuit, described antenna metal frame is connected to ground or ESD circuit, described sensing cell driving circuit is exported a series of charge/discharge clock signal to described effective feeling measurement unit, makes described effective feeling measurement unit under the excitation of described a series of charge/discharge clock signals, realize the conversion of described finger print to electric signal.
2. fingerprint acquisition system according to claim 1, it is characterized in that, described image output unit comprises an ADC array and a shift register, described fingerprint sensor detects the capacitance between each described effective feeling measurement unit and described finger line by line, described ADC array converts described electric signal to digital signal line by line, and described shift register is the described digital signal of ADC array output export line by line external data interface to described in buffer memory line by line.
3. fingerprint acquisition system according to claim 2, it is characterized in that, described each sensing cell at least comprises: a sensing electrode, at least one gain electrode, at least one reference electrode pair, on-off circuit and sensing cell control circuit, described at least one reference electrode is to being formed as respectively the two poles of the earth of at least one reference capacitance, described sensing electrode with press on finger type on described sensing electrode and become the two poles of the earth of a sense capacitance, described sensing electrode and at least one gain electrode are formed as respectively the two poles of the earth of at least one gain capacitances, described sensing cell control circuit is by the charge/discharge state of the following multiple electric capacity of described on-off circuit control:
Described sense capacitance;
At least one described reference capacitance; And,
At least one described gain capacitances.
4. fingerprint acquisition system according to claim 3, it is characterized in that, described RF-type drainage pattern specifically comprises: described sensing cell driving circuit is exported the first pulse signal to described effective feeling measurement unit, this first pulse signal is the reference capacitance charging to described effective feeling measurement unit during pulse width, make described reference capacitance two ends accumulate a fixing quantity of electric charge, described sensing cell driving circuit is exported the second pulse signal to described effective feeling measurement unit afterwards, the radiofrequency signal of described the second pulse signal and the reflection of described finger skin corium reduces the quantity of electric charge at the sense capacitance two ends of described effective feeling measurement unit, described the second pulse signal drives the fractionated gain electrode of described effective feeling measurement unit to the first current potential, drive remaining gain electrode of described effective feeling measurement unit to the second current potential simultaneously, described sensing cell driving circuit output the 3rd pulse signal is to described effective feeling measurement unit afterwards, the radiofrequency signal of described the 3rd pulse signal and the reflection of described finger skin corium makes the reference capacitance in described effective feeling measurement unit, sense capacitance and gain capacitances are carried out equalizing charge, reduce with the quantity of electric charge that makes described reference capacitance two ends, described sensing cell driving circuit is exported described second pulse signal of a fixed cycles number of times and described the 3rd pulse signal to described effective feeling measurement unit subsequently, the radio-frequency (RF) pulse signal of the identical described fixed cycles number of times of described radio-frequency (RF) driver circuit output is to described antenna metal frame, the second pulse signal of this fixed cycles number of times and the 3rd pulse signal make the voltage difference at the reference capacitance two ends of described effective feeling measurement unit successively reduce with the radiofrequency signal of the identical described fixed cycles number of times of described finger skin corium reflection jointly, it is locked that circulation finishes the voltage difference at rear described reference capacitance two ends, meanwhile described ADC array converts this voltage differential signal to fingerprint image gray-scale value, this fingerprint image gray-scale value is input in described shift register, form described digital information in fingerprint output.
5. fingerprint acquisition system according to claim 3, is characterized in that, described fingerprint sensor also comprises:
One passivation insulation, is directly covered on described fingerprint sensing cell array;
One polyester complexes insulation course, is covered on this passivation insulation, is formed as the surface of contact of described finger, and the thickness of this polyester complexes insulation course reaches hundreds of microns so that described fingerprint sensor is not affected by ESD;
Wherein, described passivation insulation, polyester complexes insulation course are formed as the megohmite insulant between described sensing electrode and finger, and become described sense capacitance with described sensing electrode and finger type.
6. according to the fingerprint detection system described in any one in claim 1 to 5, it is characterized in that, described fingerprint sensor also comprises a prosthetic finger detecting electrode, described prosthetic finger detecting electrode detects the current value that flows through this detecting electrode, and calculate the phase differential of the radiofrequency signal that the radiofrequency signal that senses and described antenna metal frame send on this detecting electrode, whether be prosthetic finger for definite object pressing on described finger contact face.
7. a finger print information acquisition method, comprises the following steps:
Sensing cell driving circuit is exported the first pulse signal to effective feeling measurement unit;
This first pulse signal is the reference capacitance charging to described effective feeling measurement unit during pulse width, makes described reference capacitance two ends accumulate a fixing quantity of electric charge;
Described sensing cell driving circuit is exported the second pulse signal to described effective feeling measurement unit;
The radiofrequency signal of described the second pulse signal and the reflection of described finger skin corium is discharged to the sense capacitance of described effective feeling measurement unit, and the quantity of electric charge at its two ends is reduced;
Described the second pulse signal drives the fractionated gain electrode of described effective feeling measurement unit to reach the first current potential, drives all the other gain electrodes of described effective feeling measurement unit to reach the second current potential simultaneously; Described sensing cell driving circuit output the 3rd pulse signal is to described effective feeling measurement unit;
The radiofrequency signal of described the 3rd pulse signal and the reflection of described finger skin corium makes reference capacitance, sense capacitance and the gain capacitances generation equalizing charge in described effective feeling measurement unit, thereby the quantity of electric charge at described reference capacitance two ends is reduced;
Described the second pulse signal and described the 3rd pulse signal that described sensing cell driving circuit is exported a fixed cycles number of times arrive described effective feeling measurement unit, described radio-frequency (RF) driver circuit is exported the radio-frequency (RF) pulse signal of identical fixed cycles number of times to antenna metal frame, and described second pulse signal of this fixed cycles number of times and described the 3rd pulse signal make the voltage difference at the reference capacitance two ends of described effective feeling measurement unit reduce gradually with the radiofrequency signal of the identical fixed cycles number of times of described finger skin corium reflection jointly;
After described fixed cycles number of cycles finishes, the voltage difference at described reference capacitance two ends is locked, described ADC array converts this voltage differential signal to fingerprint image gray-scale value, and this fingerprint image gray-scale value is input in described shift register, forms described digital information in fingerprint output.
8. acquisition method as claimed in claim 7, is characterized in that, the n power that described fixed cycles number of times is 2, and wherein n is more than or equal to 4 positive integer.
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