CN203366351U - Semiconductor fingerprint reading sensor device - Google Patents
Semiconductor fingerprint reading sensor device Download PDFInfo
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- CN203366351U CN203366351U CN 201320489863 CN201320489863U CN203366351U CN 203366351 U CN203366351 U CN 203366351U CN 201320489863 CN201320489863 CN 201320489863 CN 201320489863 U CN201320489863 U CN 201320489863U CN 203366351 U CN203366351 U CN 203366351U
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Abstract
The utility model discloses a semiconductor fingerprint reading sensor device. The semiconductor fingerprint reading sensor device comprises sensors for reading fingerprint undulations, another sensing area is set beside an area where the sensors are arranged, when a finger is placed on a fingerprint sensor device, two welding pads of an R sensor for detecting finger resistance value and a C sensor for detecting finger capacitance value are placed on a monolithic together with a grounding welding pad used for forming the two welding pads into a pair, the resistance value Rx of the finger in contact with one welding pad is measured through a circuit for detecting resistance, the capacitance value Cx of the finger in contact with the other welding pad is measured through a circuit for detecting capacitance, thus the authenticity of the finger can be judged and the state of the finger can be determined through the measured resistance value and capacitance value. The semiconductor fingerprint reading sensor device has the advantages of reading the fingerprint for authenticating whether the finger owner is just the register, determining whether the read finger is a living finger with high precision, and reading the fingerprint correctly by automatically adjusting sampling conditions according to the dry and wet states of the finger.
Description
Technical field
The utility model relates to a kind of fingerprint read sensor device, specifically a kind ofly can judge whether subject is live body, and can be according to finger wet or dry state automatically regulate acquisition condition, thereby sensor device that can accurately fetching finger mark.
Background technology
The perspiration situation of finger, temperature and humidity on every side, comprise and the reading conditions of detected person's the fingerprint patterns such as health the problem be fixed all the time under certain condition arranged with regard to the fingerprint read sensor.Reading conditions due to fingerprint pattern also is fixed in general finger situation in addition, thereby makes a part of examinee's fingerprint pattern be not easy to be read.The fingerprint read sensor device of optical profile type, be loaded into the shutter speed of CCD camera by control, control the light quantity that the prism surface reflection enters camera and regulates contrast.
Semiconductor transducer is convenient owing to loading, and by the fingerprint image to reading, is resolved, and utilizes the software that image processing techniques is modified to fingerprint pattern to be widely used.But the method for image being processed with software, not only increase the processing time, also can upset the thin section information of actual fingerprint pattern, hinder authentication result.
On the other hand, with fingerprint, come when confirming me, utilizing the simulation fingerprint to carry out the situation of crime is to need from now on the problem of facing.Japan has implemented fingerprint collecting and finger print identifying to foreign visitor in recent years, to be confirmed whether criminal history, after this system is imported into, occurred by other people fingerprint duplication in film and be pasted on oneself the finger on the women, passed through easily this fingerprint identification system and crossed the news of customs, this news also spreads wide in overseas.Proposed for this problem whether a lot of judgement fingers are the scheme of the living body detection method of live body.
Detect the device of live body with the heat conductor sensor, owing to being the method detected by the difference between body temperature and environment temperature, if prosthetic finger is adjusted to mild temperature, this live body detection method can't be penetrated.
Also once proposed by reading the scheme of pulse detection live body, but thought little thin semiconductor fingerprint sensor again for continuing, and be difficult to utilize.
To this, whether the electric capacity that utilizes finger to be with detects is the living body detection device of people's finger.This pick-up unit, from finger with capacitance and fixed resistance value, the CR oscillator by certain (frequency) generates rect.p., measures the frequency of pulse, with predefined threshold values, compares, whether detect finger is live body.
The method, just compare the value detected with predefined threshold values, if with and finger have the vacation that the material of same electric capacity is made to refer to, can't distinguish.That is to say, if can find and point the material of same electric capacity, making false finger and do not penetrated with it is to be relatively easy to, and this is a serious safety defect.
In addition, the method transmitting circuit that contains schmitt inverter, the variation of temperature is very large on its impact, and due to the setting of impressed voltage and resistance value, the situation of not posting a letter is more frequent, needs often to regulate.That is to say, be not only body temperature, and the impact be subject to when environment temperature is unstable is also larger.Therefore, be loaded on the fingerprint read sensor of monolithic unrealistic.
The solution of the prosthetic finger of making of the material with the finger same capacitance, a plurality of external signals of different frequency are put on to above-mentioned subject, recall signal according to tested finger to a plurality of external signals, judge whether tested finger is live body, in order to give the voltage of 2 of finger transmission and more different frequency from impressed voltage section, need the oscillator more than 2 in impressed voltage section, and for the output voltage of corresponding different frequency, need to increase number of elements, in order to calculate the resistance of finger, and the calculating treatmenting time of the complexity needed increases greatly, so the feasibility of miniaturization and cost degradation is lower.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, a kind of small low-cost semiconductor fingerprint read sensor device is provided, when judging accurately whether subject is live body, regulate fingerprint collecting condition, high speed acquisition fingerprint image under top condition according to the fingerprint state of subject from moving.
The technical scheme provided according to the utility model, described semiconductor fingerprint read sensor device, comprise the sensor that fetching finger mark is concavo-convex, other another sensitive zones that arranges in the zone of concavo-convex sensor at described fetching finger mark, described sensitive zones comprises: detect the electric resistance sensor of finger resistance value and detect the capacitive transducer of pointing capacitance, described electric resistance sensor comprises the circuit of the first weld pad that is arranged on described sensitive zones surface and the detection resistance be connected with the first weld pad, described capacitive transducer comprises the circuit of the second weld pad that is arranged on described sensitive zones surface and the Detection capacitance be connected with the second weld pad, by described the first weld pad and the second weld pad with they are formed to a pair of ground connection weld pad be placed on monolithic, circuit measuring finger contact the first weld pad by described detection resistance resistance value Rx, circuit measuring finger contact the second weld pad by described Detection capacitance capacitor C x, judge by resistance value Rx and the capacitor C x measured whether subject is the dry and wet state of live finger and/or finger.Described sensitive zones is provided with the array of a plurality of described electric resistance sensors and capacitive transducer.
Further, the circuit of described detection resistance comprises the bleeder circuit of the measuring resistance Rs of the known value of setting with respect to subject resistance value Rx, resistance R s and the first weld pad all are connected to the input end of the first AD converter, resistance R s is applied to the impressed voltage of set frequency, measure the resistance value Rx of subject and the branch pressure voltage of resistance R s, by the first AD converter digitizing of input reference magnitude of voltage Vref1, as digital signal, export.
Further, the circuit of described Detection capacitance comprises the bleeder circuit of the standard capacitor Cs of the known capacity arranged with respect to the capacitor C x of subject, be specially: the end of capacitor Cs and the second weld pad are connected the input end of the second AD converter together, the end of capacitor Cs is also by snap switch element SW3 ground connection, the other end of capacitor Cs by capacitor Cc ground connection, by snap switch element SW1 connect the impressed voltage of set frequency, by snap switch element SW2 ground connection, the first step, open snap switch element SW1, close snap switch element SW2 and SW3, remove the capacity of capacitors all on circuit, second step, close snap switch element SW1, open snap switch element SW2 and SW3, give capacitor Cc charging, the 3rd step, open snap switch element SW1, SW2 and SW3, the electric charge of capacitor Cc after charging is moved to capacitor C s and Cx, the branch pressure voltage of the capacitor C x pointed by measurement and standard capacitor Cs, the second AD converter digitizing by input normal voltage Vref2, as digital signal, export, the 4th step, the electric charge of each capacitor of electric discharge replacement.
The utility model has the advantages that: when by fingerprint, carrying out the confirmation of people's identity, the subject that can confirm to be placed on the fingerprint read sensor is live body, perhaps judgement is that when after live finger, differentiating accurately the finger dry and wet state again, automatically regulating the fingerprint image reading conditions in conjunction with the state of finger all the time can be at the optimal conditions down-sampling with assurance.
The accompanying drawing explanation
Fingerprint collecting schematic diagram when Fig. 1 finger is placed on the semiconductor fingerprint read sensor.
Fig. 2 is the enlarged drawing of the element of C sensor in the zone 1 of Fig. 1 and R sensor.
Fig. 3 is the A-A cut-open view of Fig. 2.
Fig. 4 is the circuit diagram that detects resistance.
Fig. 5 is the circuit diagram of Detection capacitance.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.
As shown in Figure 1, when finger is placed on fingerprint sensor arrangement, detect the finger resistance value electric resistance sensor (hereinafter referred to as the R sensor) and, detect the capacitive transducer (hereinafter referred is the C sensor) of finger capacitance, this two weld pads and they are formed to a pair of ground connection weld pad be placed on monolithic, the circuit of the detection resistance by being attached to the R sensor, measure the resistance value Rx of the finger of contact R sensor weld pad, the circuit of the Detection capacitance by being attached to the C sensor, measure the capacitor C x of the finger of contact C sensor weld pad, the true and false that judges subject by the resistance value Rx that measures and capacitor C x, or the dry and wet state of finger etc., the sensitive zones 1 that possesses above-mentioned functions is arranged on 2 sides, zone of the concavo-convex sensor of fetching finger mark, the whole semiconductor fingerprint read sensor device 3 of common formation.This sensitive zones 1 is provided with the array of a plurality of R sensors and C sensor.Fig. 1 also comprises the control circuit part 4 of semiconductor fingerprint read sensor device 3 and sensor device and outside signal connecting terminal row 5.
Fig. 2 is the enlarged drawing that forms the sensor element 14 in sensitive zones 1.In the finger side of semiconductor fingerprint read sensor device 3, by the weld pad 12 of the C sensor of the weld pad 11 of the R sensor of detection resistance value and Detection capacitance and the ground connection weld pad 13 in the middle of being listed in form.
Finger touches weld pad 11(PAD/R simultaneously) and resistance value Rx during weld pad 13, finger touches weld pad 12(PAD/C simultaneously) and capacitor C x during weld pad 13, Here it is wants the value of mensuration.
Below, the principle that judges the true and false of subject finger or finger state etc. according to resistance value Rx and capacitor C x, describe.
(1) resistance value Rx and capacitor C x, at human body in intrinsic resistance (a few megaohm) and electric capacity (a few pico farad) allowed band, between (2) two values, less than the large electric capacity of the resistance value also large or also little un-reasonable phenomenon of the little electric capacity of resistance value, (3) resistance value Rx and capacitor C x have slow variation.(1), (2), (3) are confirmed, subject is judged as live body.
On the contrary, draw the result with (1), (2), (3) contradiction, for example also large the or also little situation of the little electric capacity of resistance value of the large electric capacity of resistance value, show that subject is that artificial material is made.
Sensor device of the present utility model, in the time of above the subject finger is placed on, read from the value of R sensor and the output of C sensor, detect the resistance of finger and electric capacity whether in the scope of human body eigenvalue, perhaps from two measured values of this two sensors output, see that finger surface is wet or the dry due value of state, whether between judgement mutually, noncontradictory is arranged, also have resistance value and the capacitance of finger to change, the above reason judges whether subject is live body.
The length L that the spacing of considering adult's crestal line of fingerprint and valley line is 600 microns, set each weld pad is several mm (can put one more than crestal line), and width H and the width between weld pad of weld pad are 200 microns.Yet this size is considered and is allowed the minimized restriction of stray capacitance and select.Element shown in Fig. 2 14 is arranged by most in sensitive zones 1.
The cut-open view of the element 14 of formation sensitive zones 1 as shown in Figure 3.In Fig. 2 and Fig. 3, for simple declaration, please note that the size of finger is exaggerated than actual.
As shown in Figure 3, connecting the circuit 21 that detects resistance in the bottom of the PAD/R of detection resistance value weld pad 11, the bottom of the PAD/C weld pad 12 of Detection capacitance is connecting the circuit 22 of Detection capacitance.In fact, between the circuit of PAD/R weld pad 11 and detection resistance, there is stray resistance, between the circuit 22 of PAD/C weld pad 12 and Detection capacitance, have stray capacitance Cp.In addition, in Fig. 3, each weld pad looks like the surface that is configured in chip passivation layer 20, in fact, also can be disposed at the passivation layer 20 lower several microns parts in surface.
Detecting the circuit 21 of resistance and the concrete circuit diagram of circuit 22 of Detection capacitance distinguishes as shown in Figure 4 and Figure 5.As Fig. 4, the circuit 21 of detection resistance consists of the bleeder circuit of the measuring resistance Rs of the known value of setting with respect to subject resistance value Rx, resistance R s and PAD/R weld pad (the first weld pad) 11 all is connected to the input end of the first AD converter 23, finger is placed on PAD/R weld pad 11, resistance R s is applied to the impressed voltage of set frequency, measure the resistance value Rx of subject and the branch pressure voltage of resistance R s, by the first AD converter 23 digitizings of input reference magnitude of voltage Vref1, as digital signal, export.
Below according to Fig. 5, with regard to the principle of the circuit 22 of Detection capacitance, describe.
The circuit 22 of Detection capacitance, consist of the bleeder circuit of the standard capacitance Cs set with respect to subject capacitor C x.In addition, in this embodiment, be provided with the capacitor Cc that initial charge is used on circuit 22, and three snap switch element SW1, SW2, SW3.The end of capacitor Cs is connected the input end of the second AD converter 24 together with PAD/C weld pad (the second weld pad) 12, the end of capacitor Cs is also by snap switch element SW3 ground connection, the other end of capacitor Cs by capacitor Cc ground connection, by snap switch element SW1 connect the impressed voltage of set frequency, by snap switch element SW2 ground connection.
Table 1 is an embodiment of the circuit 22 of Detection capacitance, switches three snap switch element SW1, SW2, the variation of circuit 22 during the sequence of steps of SW3 switch.
Table 1
According to table 1, the first step, disconnect the snap switch element SW1 of (OFF) impressed voltage, remaining two snap switch element SW2 and SW3 by close (ON), the all condenser charges that reset on the circuit 22 of removing (electric discharge) Detection capacitance, second step (ON) SW1 that closes then, when driving electric charge, by disconnecting (OFF) SW2 and SW3, capacitor Cc is charged.The 3rd step, by disconnecting (OFF) three snap switch elements, in Cc, electric charge moves to Cs and Cx, according to they condenser capacity and electric power storage.Now be added in two voltage Vs and Vx on capacitor, also according to its capacity by dividing potential drop, determine magnitude of voltage, by AD converter 24 digitizings of input normal voltage Vref2, as digital signal, export.Electric charge after charging is reset (electric discharge) in the 4th step.
The switch step of the circuit that passes through the switch Detection capacitance 22 shown in Fig. 5 is measured the method for capacitor C x, uses on this aspect of capacitor Cc, note the difference with similar electric capacity assay method.That is to say, the small volume change produced in order to measure the concavo-convex of fingerprint, as the method for direct additional periodic voltage, obviously lack the precision of measuring, in this patent example, by the capacitor Cc that initial charge is used is set on the circuit 22 at Detection capacitance, improve the mensuration precision.In addition, in this patent, capacitor Cc has also born filtration.
In the circuit 22 of the Detection capacitance of Fig. 5, for simple declaration, omitted the control circuit of snap switch element.
Fig. 4 and Fig. 5 by circuit can understand, and this circuit is the simple structure only consisted of passive element, easily implement, and are not acted upon by temperature changes due to the relative value of use and normal voltage, guarantee stable operation and output.
The analog signal voltage value obtained from resistance value Rx and capacitor C x, to be judged after its digitizing and be compared, the utility model can have for this reason, input set command signal to from outside the register be arranged in sensor device, activate above-mentioned electric resistance sensor and capacitive transducer, and will carry out being stored in storer analog-digital conversion from the value of their output, require to read the function of detected value according to outside output.
Sensor device of the present utility model, even under the holding state of low-power consumption mode, also can keep the R sensor in state of activation, require to monitor the detection data of output according to outside output, when having confirmed that finger is placed on electric resistance sensor and, after causing the change that detects data, the start sensor device makes it the function in state of activation.
Simultaneously, the judgement subject is after live body, can also judge from the result of resistance value Rx and capacitor C x the wet or dry degree of finger.That is to say, resistance value Rx is little, and the words that capacitor C x is large wet, and can be judged as on the contrary dry.
Judge whether it is live body according to output valve Rx and Cx, carry out as follows.
For simple declaration, suppose from the AD converter 23 of two testing circuits and 24 outputs be 4bit, i.e. 0-15 discrete value, the scope of this value is divided into 3 types as follows, and: 0-2 is " low-down value ", 13-15 is " very high value ", and 3-12 is " normal value ".The scope of this " normal value " according to the presumable variation of environmental baseline by adjust parameter make it to meet general known to the characteristic value of live body.
Output valve Rx in this scope and Cx, within a certain period of time, such as changing to some extent between second at hundreds of μ: in the time of " words that the value of Rx increases; the value of Cx just reduces " or contrary " words of the value minimizing of Rx; the value of Cx just increases " suchlike generation inverse variation, can judge that subject is live body.
It is after live body that subject is identified, and further segments the scope of these three output valves, according to the state of finger, automatically regulates the fingerprint sampling condition.
After showing that subject is the conclusion of live body, by " range of normal value " of the value of measured value Rx and Cx minute [3-5], [6-10], [10-12] triphasic words, Rx is [3-5], Cx is that the scope finger of [10-12] is the state of " wet ", and Rx is that [10-12] Cx be that the scope of [3-5] points is the state of " doing ".
By the light source reflection of finger, see through and fingerprint image that the electric capacity of the so-called optical fingerprint read sensor of scattering or finger and fingerprint read sensor that formula is detected on electric boundary gather, deep or light information according to its image, finger is the words of the state of " wetting ", fingerprint image can shade, and finger is the tendency that the words fingerprint image of the state of " doing " can be thin out.Can regulate according to resistance value Rx and capacitor C x the deep or light condition of sample finger images.When regulating, part or all of desirable sampling fingerprint, the deep or light informix judgement of combining image.
The concavo-convex sensor of detection fingerprint with fingerprint image perceptional function, by regulating its sensitivity, can adjust the deep or light degree of fingerprint image.Specifically, the optical fingerprint read sensor, by the switching of adjustment light accepting part or the speed of shutter, and capacitance detecting formula fingerprint read sensor is to regulate the sensor sensitivity by the gain of adjustment amplifying circuit and the side-play amount of electric capacity.
Table 2 has shown that Rx is at [3-5], and Cx is at [10-12], and Rx is at [10-12], the deep or light degree of Cx fingerprint image when [3-5], and the corresponding method of capacitance detecting formula fingerprint read sensor now.
Table 2
In other words, if measurement result as the first row in table 2, is judged as " wet finger ".In this case, the deep or light degree of the image of collected actual fingerprint becomes " secretly ".For to improve the quality of image, to turn down the gain that is arranged on the signal amplification circuit in each pixel that forms the concavo-convex sensor of fetching finger mark, enlarge the ultimate value of the offset control circuit of control simulation-digital conversion circuit, can improve overall image quality.
Now, in order accurately to examine self-regulating process, all or part of of the fingerprint image data of use actual acquisition, and the deep or light degree of image, data mean value and standard deviation value come together automatically to regulate.The example of the concrete grammar of automatically regulating, for the standard deviation value by the deep or light degree of fingerprint image minimizes, can will gain with off-set value optimization, make fingerprint image in optimum condition by linear programming technique (linear programming).
As described above, the utlity model has, after subject finger is placed on sensor and is judged as live body, read the dry and wet state that judges finger surface from the size of the value of R sensor and C sensor output, and feedback result, deep or light situation according to the fingerprint image of taking, obviously when too dark (point wet time) or too light (finger is dry), the concavo-convex information amplifying circuit gain of fingerprint in the pixel that forms the concavo-convex sensor of fetching finger mark and the upper limit of analog to digital converter will be arranged on, the characteristic value of lower limit (skew) control circuit is adjusted to the function of an optimum value automatically.The utility model is, while carrying out finger print identifying, when can high-precision differentiation being put in subject on the fingerprint read sensor and whether being live body, according to the state of the finger of subject, automatically regulate small-sized, fingerprint read sensor cheaply that the fingerprint image reading conditions guarantees to gather under top condition all the time fingerprint image.
Claims (4)
1. semiconductor fingerprint read sensor device, comprise the sensor that fetching finger mark is concavo-convex, it is characterized in that: other another sensitive zones that arranges in the zone of concavo-convex sensor at described fetching finger mark, described sensitive zones comprises: detect the electric resistance sensor of finger resistance value and detect the capacitive transducer of pointing capacitance, described electric resistance sensor comprises the circuit of the first weld pad that is arranged on described sensitive zones surface and the detection resistance be connected with the first weld pad, described capacitive transducer comprises the circuit of the second weld pad that is arranged on described sensitive zones surface and the Detection capacitance be connected with the second weld pad, by described the first weld pad and the second weld pad with they are formed to a pair of ground connection weld pad be placed on monolithic, circuit measuring finger contact the first weld pad by described detection resistance resistance value Rx, circuit measuring finger contact the second weld pad by described Detection capacitance capacitor C x.
2. semiconductor fingerprint read sensor device as claimed in claim 1, is characterized in that, described sensitive zones is provided with the array of a plurality of described electric resistance sensors and capacitive transducer.
3. semiconductor fingerprint read sensor device as claimed in claim 1, it is characterized in that, the circuit of described detection resistance comprises the bleeder circuit of the measuring resistance Rs of the known value of setting with respect to subject resistance value Rx, resistance R s and the first weld pad all are connected to the input end of the first AD converter, resistance R s is applied to the impressed voltage of set frequency, measure the resistance value Rx of subject and the branch pressure voltage of resistance R s, by the first AD converter digitizing of input reference magnitude of voltage Vref1, as digital signal, export.
4. semiconductor fingerprint read sensor device as claimed in claim 1, it is characterized in that, the circuit of described Detection capacitance comprises the bleeder circuit of the standard capacitor Cs of the known capacity arranged with respect to the capacitor C x of subject, be specially: the end of capacitor Cs and the second weld pad are connected the input end of the second AD converter together, the end of capacitor Cs is also by snap switch element SW3 ground connection, the other end of capacitor Cs by capacitor Cc ground connection, by snap switch element SW1 connect the impressed voltage of set frequency, by snap switch element SW2 ground connection, the first step, open snap switch element SW1, close snap switch element SW2 and SW3, remove the capacity of capacitors all on circuit, second step, close snap switch element SW1, open snap switch element SW2 and SW3, give capacitor Cc charging, the 3rd step, open snap switch element SW1, SW2 and SW3, the electric charge of capacitor Cc after charging is moved to capacitor C s and Cx, the branch pressure voltage of the capacitor C x pointed by measurement and standard capacitor Cs, the second AD converter digitizing by input normal voltage Vref2, as digital signal, export, the 4th step, the electric charge of each capacitor of electric discharge replacement.
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| CN 201320489863 CN203366351U (en) | 2013-08-12 | 2013-08-12 | Semiconductor fingerprint reading sensor device |
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| CN 201320489863 CN203366351U (en) | 2013-08-12 | 2013-08-12 | Semiconductor fingerprint reading sensor device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103870817A (en) * | 2014-03-27 | 2014-06-18 | 成都费恩格尔微电子技术有限公司 | Radio-frequency micro-capacitance fingerprint acquisition chip and method |
| CN105930704A (en) * | 2016-04-01 | 2016-09-07 | 乐视控股（北京）有限公司 | Fingerprint identification method and apparatus, and intelligent terminal |
| CN110956084A (en) * | 2019-10-21 | 2020-04-03 | Oppo广东移动通信有限公司 | Drive circuit, control method, electronic device, apparatus, and storage medium |
-
2013
- 2013-08-12 CN CN 201320489863 patent/CN203366351U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103870817A (en) * | 2014-03-27 | 2014-06-18 | 成都费恩格尔微电子技术有限公司 | Radio-frequency micro-capacitance fingerprint acquisition chip and method |
| CN103870817B (en) * | 2014-03-27 | 2019-04-05 | 成都费恩格尔微电子技术有限公司 | Radio frequency type micro-capacitor fingerprint acquisition chip and acquisition method |
| CN105930704A (en) * | 2016-04-01 | 2016-09-07 | 乐视控股（北京）有限公司 | Fingerprint identification method and apparatus, and intelligent terminal |
| CN110956084A (en) * | 2019-10-21 | 2020-04-03 | Oppo广东移动通信有限公司 | Drive circuit, control method, electronic device, apparatus, and storage medium |
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