CN103902971A - Fingerprint detection circuit and fingerprint detection device - Google Patents
Fingerprint detection circuit and fingerprint detection device Download PDFInfo
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- CN103902971A CN103902971A CN201410089028.7A CN201410089028A CN103902971A CN 103902971 A CN103902971 A CN 103902971A CN 201410089028 A CN201410089028 A CN 201410089028A CN 103902971 A CN103902971 A CN 103902971A
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- fingerprint detection
- signal
- circuit
- emitting electrode
- sensing unit
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
Abstract
The invention discloses a fingerprint detection circuit and a fingerprint detection device. The fingerprint detection circuit comprises a signal generation circuit, an emitting electrode, an induction unit and a signal processing circuit, wherein the signal generation circuit is used for generating an alternating-current signal, the emitting electrode is used for transmitting the alternating-current signal to fingers, the induction unit is used for collecting fingerprint information of the fingers, the signal processing circuit is used for processing the fingerprint information, and the signal generation circuit is electrically connected with the emitting electrode and the induction unit respectively. In this way, the alternating-current signal with a certain amplitude is coupled to the fingers by the emitting electrode so that a voltage division signal can be formed by the alternating-current signal through a first capacitor formed between the fingers and the induction unit and a second capacitor formed between the induction unit and the ground, output data including fingerprint information are generated after the voltage division signal is processed through the signal processing circuit, and finally fingerprint detection can be completed. Because an open-loop structure is adopted in the whole circuit and any feedback circuit is not adopted, the circuit is low in cost, high in reliability and high in fingerprint detection speed.
Description
Technical field
The present invention relates to fingerprint detection technical field, especially relate to a kind of fingerprint detection circuit and the finger print detection device with this fingerprint detection circuit.
Background technology
In finger print detection device, fingerprint detection circuit is converted into the nucleus module of electric signal for fingerprint being comprised to the image information at " peak " and " paddy ".Chinese patent 200710129193.0 has disclosed a kind of fingerprint detection circuit, it comprises that outer electrode 10, detecting unit 20, resistance 30 and signal produce source 40, outer electrode 10 produces source 40 with signal and is coupled to respectively datum Vcmb and Vcma, detecting unit 20 is coupled to signal by resistance 30 and produces source 40, testing circuit also comprises that an output terminal OUT is coupled between detecting unit 20 and resistance 30, output terminal OUT connection judgment circuit and analog to digital converter.Between different detecting units 20 and the finger 50 different lines in surface, equivalence forms many capacitance components with different capacitances, signal is produced to source 40, resistance 30 and capacitance component form a filtering circuit, therefore on output terminal OUT, can produce the reference signal that source 40 provides according to signal, along with the different detection signal of the different and corresponding generations of the resistance value of resistance 30 and the capacitance of capacitance component, thereby realize fingerprint detection.
But there is following defect in this technical scheme: first, because the electric capacity of capacitance component is very little, obtain suitable cutoff frequency and just require resistance 30 very large, be integrated on chip and can consume very large cost; Secondly, in the time detecting single fingerprint pixel, need to experience multiple " adjusting of comparer detection-> input signal " cycles and determine final DC level, the accuracy of detection more sense cycle of high request is longer, has caused these two important indicators of detection speed and accuracy of detection to get both; Finally, the signal of this patent produces source 40 and has formed a closed loop with analog to digital converter, makes circuit have the unsettled risk of loop.
In sum, existing fingerprint detection circuit, circuit cost is higher, and circuit stability is poor, and fingerprint detection speed is slower.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of fingerprint detection circuit and finger print detection device, is intended to reduce circuit cost, improves circuit stability and fingerprint detection speed.
To achieve these objectives, the present invention proposes a kind of fingerprint detection circuit, comprising:
Signal generating circuit, for generation of AC signal;
Emitting electrode, for transmitting described AC signal to finger;
Sensing unit, for gathering the finger print information of finger;
Signal processing circuit, for the treatment of described finger print information;
Described signal generating circuit is electrically connected with described emitting electrode, and described sensing unit is electrically connected with described signal processing circuit; Between described sensing unit and described finger, there is the first electric capacity, between described sensing unit and GND, have the second electric capacity.
Preferably, described signal generating circuit comprises digital to analog converter, driver and DC booster, described driver is electrically connected with described digital to analog converter, DC booster and emitting electrode respectively, the input end of wherein said driver is electrically connected with the output terminal of described digital to analog converter, and the output terminal of described driver is electrically connected with described emitting electrode.
Preferably, described signal generating circuit comprises digital to analog converter and LC resonant circuit, and the input end of described LC resonant circuit is electrically connected with the output terminal of described digital to analog converter, and the output terminal of described LC resonant circuit is electrically connected with described emitting electrode.
Preferably, described signal processing circuit comprises amplifier and analog to digital converter, and the input end of described amplifier is electrically connected with described sensing unit, and the output terminal of described amplifier is electrically connected with the input end of described analog to digital converter.
Preferably, described sensing unit comprises multiple induction electrodes, and described amplifier has multiple, and each amplifier electric connects an induction electrode.
Preferably, described emitting electrode and sensing unit are integrated in an induction chip.
Preferably, described emitting electrode is annular emitting electrode, and it is surrounded on around described sensing unit.
Preferably, directly with finger contact or by an electric conductor, indirect and finger contact transmits described AC signal to described emitting electrode.
The present invention proposes a kind of finger print detection device simultaneously, comprises a fingerprint detection circuit, and described fingerprint detection circuit comprises: signal generating circuit, for generation of AC signal; Emitting electrode, for transmitting described AC signal to finger; Sensing unit, for gathering the finger print information of finger; Signal processing circuit, for the treatment of described finger print information; Described signal generating circuit is electrically connected with described emitting electrode, and described sensing unit is electrically connected with described signal processing circuit; Between described sensing unit and described finger, there is the first electric capacity, between described sensing unit and GND, have the second electric capacity.
A kind of fingerprint detection circuit provided by the present invention, by emitting electrode, the AC signal with certain amplitude is coupled to finger, make this AC signal by the second electric capacity generation voltage division signal of formation between the first electric capacity of forming between finger and sensing unit and sensing unit and ground (GND), this voltage division signal is fingerprint induced signal, it produces the output data that comprised finger print information after signal processing circuit is processed, and has realized the detection of fingerprint.Because whole circuit adopts open loop structure, do not comprise any feedback control loop, circuit cost is low, and does not have loop stability problem, and reliability is high; And fingerprint detection circuit of the present invention can only use the time of the change-over period of an analog to digital converter the soonest, the image information at " peak " and " paddy " can be converted into corresponding electric signal, therefore improve fingerprint detection speed.
Brief description of the drawings
Fig. 1 is the circuit diagram of the fingerprint detection circuit of prior art;
Fig. 2 is the structured flowchart of fingerprint detection circuit one embodiment of the present invention;
Fig. 3 is the equivalent circuit diagram of the fingerprint detection circuit in Fig. 2.
Realization, functional characteristics and the advantage of the object of the invention, in connection with embodiment, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Fingerprint detection circuit of the present invention, for capacitance-voltage-distributing type fingerprint detection circuit, utilize " peak " and " paddy " corresponding the first capacitor C 1(or the title inductance capacitance comprising on fingerprint) vary in size, so also different principle of the amplitude of output signal, is converted into corresponding electric signal by the image information at " peak " and " paddy " under the excitation of same AC signal.
Referring to Fig. 1, Fig. 2, fingerprint detection circuit one embodiment of the present invention is proposed, described fingerprint detection circuit comprises signal generating circuit 100, emitting electrode 200, sensing unit 300 and signal processing circuit 400, wherein, signal generating circuit 100 is electrically connected with emitting electrode 200, and sensing unit 300 is electrically connected with signal processing circuit 400.Signal generating circuit 100 is for generation of AC signal; Emitting electrode 200 is for transmitting AC signal to pointing 500, and it can directly contact with finger 500, or indirectly contacts with finger 500 by this electric conductor after connecting an electric conductor; Sensing unit 300, for gathering the finger print information of finger 500, produces the voltage signal of corresponding amplitude according to fingerprint, its surface coverage one insulation course is to completely cut off finger 500 and sensing unit 300; Signal processing circuit 400 is processed accordingly for the finger print information that sensing unit 300 is collected, thereby voltage signal is converted to finger print data.Concrete equivalent circuit diagram as shown in Figure 2, is elaborated below in conjunction with Fig. 2.
Signal generating circuit 100 comprises digital to analog converter 110, driver 120 and DC booster 130, driver 120 is electrically connected with digital to analog converter 110, DC booster 130 and emitting electrode 200 respectively, wherein the input end of driver 120 is electrically connected with the output terminal of digital to analog converter 110, and the output terminal of driver 120 is electrically connected with emitting electrode 200.The AC signal source of enter drive 120 is the output voltage of digital to analog converter 110, and digital to analog converter 110 can be exported various AC wave shape according to different numerical codings, as sine wave, square wave, triangular wave etc.The working power voltage of driver 120 is provided by DC booster 130, DC booster 130 raises the low-tension supply voltage in system for exporting to driver 120 after high-voltage power voltage, exports the voltage magnitude of the AC signal of emitting electrode 200 to increase driver 120 to.In certain embodiments, described driver 120 also can be replaced by LC resonant circuit with DC booster 130, the input end of LC resonant circuit is electrically connected with digital to analog converter 110, the output terminal of LC resonant circuit is electrically connected with emitting electrode 200, thereby the voltage magnitude of the AC signal that LC resonant circuit is inputted digital to analog converter 110 exports emitting electrode 200 to after increasing.
Emitting electrode 200 and sensing unit 300 are integrated in an induction chip.Sensing unit 300 is made up of the induction electrode 310 of multiple array arrangements, and emitting electrode 200 is annular emitting electrode, and it is surrounded on around sensing unit 300.Described induction electrode 310 is pointed 500 fingerprint by detection and is produced different detected values and obtain finger print information, more particularly, between different induction electrodes 310 and the finger 500 different lines in surface, equivalence forms many capacitance components with different capacitances, this detected value is the capacitance of capacitance component, one of them electrode of this capacitance component is made up of induction electrode 310, another electrode is made up of surface and emitting electrode 200 equivalences of finger 500, and insulation course becomes the dielectric layer in capacitance component.When finger 500 presses on induction chip, direct or indirect contacts with emitting electrode 200, so that AC signal is coupled to finger 500 by emitting electrode 200; Point the insulation course on 300 surfaces, 500 contact induction unit simultaneously, cover multiple induction electrodes 310, under the excitation of AC signal, between finger 500 surfaces and induction electrode 310, form the first capacitor C 1(or claim inductance capacitance), known according to the computing formula of capacity plate antenna, distance on capacitance and electric capacity between bottom crown is inversely proportional to, and therefore points the first capacitor C 1 that in lines, " peak " and " paddy " is corresponding and varies in size.
Signal processing circuit 400 comprises amplifier 410 and analog to digital converter 420, and the input end of amplifier 410 is electrically connected with sensing unit 300, and the output terminal of amplifier 410 is electrically connected with the input end of analog to digital converter 420.The quantity of amplifier 410 is identical with the quantity of induction electrode 310, each amplifier 410 is electrically connected an induction electrode 310(for simplicity, in Fig. 2, only show the connection diagram of an induction electrode and an amplifier), each induction electrode 310 and ground (Ground, GND) between, all there is a second capacitor C 2(or claim stray capacitance), AC signal on finger 500 is the input voltage of amplifier 410 through the branch pressure voltage between the first capacitor C 1 and the second capacitor C 2, amplifier 410 exports analog to digital converter 420 to after input voltage is amplified, after the analog voltage signal receiving being converted to digital signal by analog to digital converter 420 again, export, the finger print information that data of output detect.By adopting the analog to digital converter 420 of suitable accuracy, can guarantee that the packet of output is containing enough half-tone informations.
The correlation parameter providing in fingerprint detection circuit of the present invention according to conventional circuit parameter below calculates:
Suppose that induction electrode 310 and the first capacitor C 1 that " peak " of fingerprint forms are 1fF to the maximum, the second capacitor C 2 is 20fF, the voltage magnitude of the AC signal that driver 120 is exported is 10V, and the enlargement factor of amplifier 410 is 3 times, can be regarded as to such an extent that the output voltage of amplifier 410 is:
V1=10V*[1fF/(1fF+20fF)]*3=1.428V
Suppose the first capacitor C 1 that induction electrode 310 and " paddy " of fingerprint forms minimum be 0.95fF, other parameter constant (being that other parameter is identical with " peak " of fingerprint), can be regarded as to such an extent that the output voltage of amplifier 410 is:
V2=10V*[0.95fF/(0.95fF+20fF)]*3=1.36V
Therefore the output voltage difference between " peak " and " paddy " of fingerprint is:
V1-V2=68mV
The resolution voltage of the 8 grade gray scales corresponding with this voltage difference is:
VLSB=68mV/8=8.5mV；
Suppose the reference voltage Vref=2V of analog to digital converter 420, according to formula: VLSB=Vref/2N(wherein N represents accuracy class) can be regarded as to such an extent that the precision N of analog to digital converter 420 is required as 8-bit(8 position).
Accordingly, fingerprint detection circuit of the present invention, by emitting electrode 200, the AC signal with certain amplitude is coupled to finger 500, make this AC signal by point 500 and sensing unit 300 between between the first capacitor C 1 of forming and sensing unit 300 and ground the second capacitor C 2 of forming produce voltage division signal, this voltage division signal is fingerprint induced signal, it produces the output data that comprised finger print information after signal processing circuit 400 is processed, and has realized the detection of fingerprint.Because whole circuit adopts open loop structure, do not comprise any feedback control loop, circuit cost is low, and does not have loop stability problem, and reliability is high; And fingerprint detection circuit of the present invention can only use the time of the change-over period of an analog to digital converter the soonest, the image information at " peak " and " paddy " can be converted into corresponding electric signal, therefore fingerprint detection speed is fast.
Simultaneously, in view of supply voltage conventional in mobile terminal system lower (being generally 2.8V), cause digital to analog converter 110 to produce the amplitude of AC signal lower, can cause accordingly the useful signal amplitude of the fingerprint induction producing lower, after adopting DC booster 130 that the voltage in mobile terminal system is raise in the present invention, export driver 120 to, make AC signal that digital to analog converter 110 produces by enough large AC signal of formation amplitude after driver 120, the last fingerprint induced signal by amplifier 410, sensing unit 300 being produced again amplifies processing.Thereby, make to export packet and contained gradation of image that precision is enough differentiating finger print information, possess the voltage accuracy of corresponding 8 grades of gradation of images, therefore fingerprint detection precision is higher.
The present invention proposes a kind of finger print detection device simultaneously, comprises a fingerprint detection circuit, and described fingerprint detection circuit comprises: signal generating circuit, for generation of AC signal; Emitting electrode, for transmitting described AC signal to finger; Sensing unit, for gathering the finger print information of finger; Signal processing circuit, for the treatment of described finger print information; Described signal generating circuit is electrically connected with described emitting electrode, and described sensing unit is electrically connected with described signal processing circuit; Between described sensing unit and described finger, there is the first electric capacity, between described sensing unit and GND, have the second electric capacity.Fingerprint detection circuit described in the present embodiment is the related fingerprint detection circuit of above-described embodiment in the present invention, does not repeat them here.
Finger print detection device of the present invention, has adopted after above-mentioned fingerprint detection circuit, has reduced cost, has improved reliability, has improved fingerprint detection speed and accuracy of detection simultaneously.
Should be understood that; these are only the preferred embodiments of the present invention; can not therefore limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes instructions of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. a fingerprint detection circuit, is characterized in that, comprising:
Signal generating circuit, for generation of AC signal;
Emitting electrode, for transmitting described AC signal to finger;
Sensing unit, for gathering the finger print information of finger;
Signal processing circuit, for the treatment of described finger print information;
Described signal generating circuit is electrically connected with described emitting electrode, and described sensing unit is electrically connected with described signal processing circuit; Between described sensing unit and described finger, there is the first electric capacity, between described sensing unit and GND, have the second electric capacity.
2. fingerprint detection circuit according to claim 1, it is characterized in that, described signal generating circuit comprises digital to analog converter, driver and DC booster, described driver is electrically connected with described digital to analog converter, DC booster and emitting electrode respectively, the input end of wherein said driver is electrically connected with the output terminal of described digital to analog converter, and the output terminal of described driver is electrically connected with described emitting electrode.
3. fingerprint detection circuit according to claim 1, it is characterized in that, described signal generating circuit comprises digital to analog converter and LC resonant circuit, the input end of described LC resonant circuit is electrically connected with the output terminal of described digital to analog converter, and the output terminal of described LC resonant circuit is electrically connected with described emitting electrode.
4. according to the fingerprint detection circuit described in claim 1-3 any one, it is characterized in that, described signal processing circuit comprises amplifier and analog to digital converter, the input end of described amplifier is electrically connected with described sensing unit, and the output terminal of described amplifier is electrically connected with the input end of described analog to digital converter.
5. fingerprint detection circuit according to claim 4, is characterized in that, described sensing unit comprises multiple induction electrodes, and described amplifier has multiple, and each amplifier electric connects an induction electrode.
6. according to the fingerprint detection circuit described in claim 1-3 any one, it is characterized in that, described emitting electrode and sensing unit are integrated in an induction chip.
7. fingerprint detection circuit according to claim 6, is characterized in that, described emitting electrode is annular emitting electrode, and it is surrounded on around described sensing unit.
8. fingerprint detection circuit according to claim 6, is characterized in that, described sensing unit is made up of the induction electrode of multiple array arrangements.
9. according to the fingerprint detection circuit described in claim 1-3 any one, it is characterized in that, directly with finger contact or by an electric conductor, indirect and finger contact transmits described AC signal to described emitting electrode.
10. a finger print detection device, is characterized in that, comprises the fingerprint detection circuit as described in claim 1-9 any one.
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| CN201410089028.7A CN103902971A (en) | 2014-03-12 | 2014-03-12 | Fingerprint detection circuit and fingerprint detection device |
| PCT/CN2014/088392 WO2015135318A1 (en) | 2014-03-12 | 2014-10-11 | Fingerprint detection circuit and fingerprint detection apparatus |
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| CN201410089028.7A CN103902971A (en) | 2014-03-12 | 2014-03-12 | Fingerprint detection circuit and fingerprint detection device |
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| CN104331202A (en) * | 2014-11-07 | 2015-02-04 | 深圳市汇顶科技股份有限公司 | Fingerprint detection circuit, sensor and touch screen |
| WO2015135318A1 (en) * | 2014-03-12 | 2015-09-17 | 深圳市汇顶科技股份有限公司 | Fingerprint detection circuit and fingerprint detection apparatus |
| CN105117684A (en) * | 2015-07-27 | 2015-12-02 | 深圳市汇顶科技股份有限公司 | Fingerprint detection circuit and fingerprint recognition system |
| CN105138957A (en) * | 2015-07-24 | 2015-12-09 | 深圳市汇顶科技股份有限公司 | Fingerprint detection circuit and fingerprint identification system |
| CN105335737A (en) * | 2015-12-02 | 2016-02-17 | 苏州迈瑞微电子有限公司 | Capacitive fingerprint sensor |
| WO2016055007A1 (en) * | 2014-10-06 | 2016-04-14 | Shenzhen Huiding Technology Co., Ltd. | Self-capacitive fingerprint sensor with active amplified pixels |
| WO2016127738A1 (en) * | 2015-02-13 | 2016-08-18 | Byd Company Limited | Fingerprint detection circuit and method, electronic device |
| CN105893918A (en) * | 2015-01-26 | 2016-08-24 | 胡家安 | Fingerprint detection device and method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1564189A (en) * | 2004-04-22 | 2005-01-12 | 叶军 | Semiconductor acquisition element for fingerprint |
| CN101344917A (en) * | 2007-07-13 | 2009-01-14 | 晨星半导体股份有限公司 | Fingerprint detection circuit |
| US20110032077A1 (en) * | 2009-08-07 | 2011-02-10 | Authen Tec, Inc, State of Incorporated: Delaware | Finger biometric sensor including laterally adjacent piezoelectric transducer layer and associated methods |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101727571B (en) * | 2008-10-24 | 2012-09-19 | 宏碁股份有限公司 | Fingerprint sensing device and fingerprint sensing touch device |
| CN103902971A (en) * | 2014-03-12 | 2014-07-02 | 深圳市汇顶科技股份有限公司 | Fingerprint detection circuit and fingerprint detection device |
-
2014
- 2014-03-12 CN CN201410089028.7A patent/CN103902971A/en active Pending
- 2014-10-11 WO PCT/CN2014/088392 patent/WO2015135318A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1564189A (en) * | 2004-04-22 | 2005-01-12 | 叶军 | Semiconductor acquisition element for fingerprint |
| CN101344917A (en) * | 2007-07-13 | 2009-01-14 | 晨星半导体股份有限公司 | Fingerprint detection circuit |
| US20110032077A1 (en) * | 2009-08-07 | 2011-02-10 | Authen Tec, Inc, State of Incorporated: Delaware | Finger biometric sensor including laterally adjacent piezoelectric transducer layer and associated methods |
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| WO2016055007A1 (en) * | 2014-10-06 | 2016-04-14 | Shenzhen Huiding Technology Co., Ltd. | Self-capacitive fingerprint sensor with active amplified pixels |
| US9990533B2 (en) | 2014-10-06 | 2018-06-05 | Shenzhen GOODIX Technology Co., Ltd. | Self-capacitive fingerprint sensor with active amplified pixels |
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Application publication date: 20140702 |