CN204537158U - A kind of finger print detection device - Google Patents
A kind of finger print detection device Download PDFInfo
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- CN204537158U CN204537158U CN201520053427.8U CN201520053427U CN204537158U CN 204537158 U CN204537158 U CN 204537158U CN 201520053427 U CN201520053427 U CN 201520053427U CN 204537158 U CN204537158 U CN 204537158U
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Abstract
The utility model provides a kind of finger print detection device, and this device comprises: array of detection units, comprises M detecting unit of arranging according to predetermined arranging rule; Each detecting unit in described array of detection units comprises: identification module, for detecting finger print information; Shading ring, surrounds described identification module, for shielding the signal cross-talk between described identification module; Drive layer, described driving layer is connected with described shading ring, for driving described identification module.Finger print detection device arranges driving layer around each identification module, drive layer only need drive its identification module surrounded, and whole array of detection units need not be driven as driving ring of the prior art, therefore, drive singal is loaded on the driving layer that arranges around single identification module by the finger print detection device that the embodiment of the present application provides, thus reduce the load of drive singal needs driving, reduce the power consumption of finger print detection device.
Description
Technical field
The utility model relates to electronic technology field, particularly relates to a kind of finger print detection device.
Background technology
Along with electronic technology development, various portable electric appts also gets more and more, such as the portable electric appts such as mobile phone, panel computer.
At present, portions of electronics equipment can arrange finger print detection device, be illustrated in figure 1 the structural representation of a kind of finger print detection device of the prior art, array of detection units and driving ring is contained in Fig. 1, the drive singal (such as: sinusoidal signal, square-wave signal etc.) that driving circuit provides is loaded on driving ring, during detecting unit in the finger contact array of detection units of user electronic equipment being detected, driving ring drives array of detection units, and then drive singal is emitted to the skin corium of finger of user.Operationally, drive singal will be loaded on whole driving ring driving ring, and drive singal needs the load driven to be whole array of detection units, increases the power consumption of electronic equipment.
Utility model content
The embodiment of the present application provides a kind of finger print detection device and method, is loaded on driving ring in order to solve finger print detection device in prior art by drive singal, and drive singal needs the load of driving comparatively large, the problem that power consumption is larger.
The embodiment of the present application provides a kind of finger print detection device, comprising:
Array of detection units, comprises the detecting unit that M arranges according to predetermined arranging rule, M be more than or equal to 1 positive integer;
Wherein, each detecting unit in described array of detection units comprises:
Identification module, for detecting finger print information;
Shading ring, surrounds described identification module, for shielding the signal cross-talk between described identification module;
Drive layer, described driving layer is connected with described shading ring, for driving described identification module.
Optionally, described driving layer surround described shading ring or
Described identification module is arranged at the ground floor of described array of detection units, and described driving layer is arranged at the second layer of described array of detection units, and wherein, described ground floor is positioned at the top of the described second layer.
Optionally, described finger print detection device also comprises:
Fingerprint sensing element, is connected with described array of detection units;
Described fingerprint sensing element comprises:
Unity gain amplifier module, a detecting unit in a corresponding described array of detection units of unity gain amplifier module, being connected with described identification module and described shading ring, for driving described shading ring, changing to make described shading ring with described identification module;
Multiple input single output switch, an input cutter head of described multiple input single output switch connects a unity gain amplifier module;
Correlated-double-sampling detuner, is connected with the output cutter head of described multiple input single output switch;
Variable gain amplifier, is connected with described correlated-double-sampling detuner;
Analog-to-digital conversion module, is connected with described variable gain amplifier.
Optionally, described identification module is rectangle, and the identification module of rectangle is circular or rectangular array according to predetermined arranging rule arrangement.
Optionally, there is between described identification module and described shading ring the first distance, between described shading ring and described driving layer, there is second distance, between adjacent described driving layer, there is the 3rd distance.
Optionally, described finger print detection device also comprises:
Becket, surrounds described array of detection units, and described becket ground connection, for the protection of described array of detection units.
The one or more technical schemes provided in the embodiment of the present application, at least have following technique effect or advantage:
The embodiment of the present application provides a kind of finger print detection device, comprising: array of detection units, comprises the detecting unit that M arranges according to predetermined arranging rule, M be more than or equal to 1 positive integer; Wherein, each detecting unit in described array of detection units comprises: identification module, for detecting finger print information; Shading ring, surrounds described identification module, for shielding the signal cross-talk between described identification module; Drive layer, described driving layer is connected with described shading ring, for driving described identification module.
That is, there is not the driving ring in the finger print detection device shown in Fig. 1 in the finger print detection device that the embodiment of the present application provides, but driving layer is set around each identification module, drive layer only need drive its identification module surrounded, and whole array of detection units need not be driven as driving ring of the prior art, therefore, drive singal is loaded on the driving layer that arranges around single identification module by the finger print detection device that the embodiment of the present application provides, thus reduce the load of drive singal needs driving, reduce the power consumption of finger print detection device.
In addition, around each identification module in the finger print detection device that the embodiment of the present application provides, be provided with shading ring, therefore, between identification module, have separate shading ring, reduce the signal cross-talk between identification module, improve the quality of fingerprint image.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of a kind of finger print detection device in prior art;
Fig. 2 is the structural representation of a kind of finger print detection device in the embodiment of the present application;
Fig. 3 is the structural representation of fingerprint sensing element in the embodiment of the present application;
Fig. 4 is that of unity gain amplifier module in the embodiment of the present application realizes structural drawing;
Fig. 5 is the principle of work schematic diagram of unity gain amplifier in the embodiment of the present application;
Fig. 6 is the process flow diagram of the method for a kind of fingerprint detection in the embodiment of the present application.
Embodiment
The embodiment of the present application provides a kind of finger print detection device and method, is loaded on driving ring in order to solve finger print detection device in prior art by drive singal, and drive singal needs the load of driving comparatively large, the problem that power consumption is larger.
The embodiment of the present application provides a kind of finger print detection device, comprising: array of detection units, comprises the detecting unit that M arranges according to predetermined arranging rule, M be more than or equal to 1 positive integer; Wherein, each detecting unit in described array of detection units comprises: identification module, for detecting finger print information; Shading ring, surrounds described identification module, for shielding the signal cross-talk between described identification module; Drive layer, described driving layer is connected with described shading ring, for driving described identification module.
That is, there is not the driving ring in the finger print detection device shown in Fig. 1 in the finger print detection device that the embodiment of the present application provides, but driving layer is set around each identification module, drive layer only need drive its identification module surrounded, and whole array of detection units need not be driven as driving ring of the prior art, therefore, drive singal is loaded on the driving layer that arranges around single identification module by the finger print detection device that the embodiment of the present application provides, thus reduce the load of drive singal needs driving, reduce the power consumption of finger print detection device.
In addition, around each identification module in the finger print detection device that the embodiment of the present application provides, be provided with shading ring, therefore, between identification module, have separate shading ring, reduce the signal cross-talk between identification module, improve the quality of fingerprint image.
For making the object of the embodiment of the present application, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Term "and/or" herein, being only a kind of incidence relation describing affiliated partner, can there are three kinds of relations in expression, and such as, A and/or B, can represent: individualism A, exists A and B simultaneously, these three kinds of situations of individualism B.In addition, character "/" herein, general expression forward-backward correlation is to the relation liking a kind of "or".
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail.
Be illustrated in figure 2 the structural representation of a kind of fingerprint detection module in the embodiment of the present application, finger print detection device comprises: array of detection units 20, comprise M detecting unit of arranging according to predetermined arranging rule, M be more than or equal to 1 positive integer, the size of array of detection units 20 can be 128 be multiplied by 128, or other arbitrary values.
Wherein, each detecting unit 201 in array of detection units 20 comprises: identification module 2011, shading ring 2012 and driving layer 2013, and shading ring 2012 surrounds identification module 2011, drives layer 2013 to be connected with shading ring 2012.
In the embodiment of the present application, drive layer 2013 to be connected with shading ring 2012, specifically have following two kinds of embodiments:
The first embodiment is: drive layer 2013 to surround described shading ring 2012;
The second embodiment is: described identification module 2011 is arranged at the ground floor of described array of detection units, and described driving layer 2013 is arranged at the second layer of described array of detection units, and wherein, described ground floor is positioned at the top of the described second layer.
Specifically, the schematic diagram of the first embodiment above-mentioned is illustrated in figure 2.Drive layer 2013 to surround shading ring 2012, because shading ring 2012 surrounds identification module 2011, so drive layer 2013 also to surround identification module 2011, now, drive layer 2013 and identification module 2011 to be positioned at same layer.
Certainly, drive layer 2013 should be not limited to the surrounding being enclosed in shading ring 2012, namely the surrounding being enclosed in identification module 2011 is not limited to, same layer is positioned at identification module 2011, in the second embodiment, drive layer 2013 can be positioned at the periphery of whole array of detection units, concrete, be positioned at the below of identification module 2011, that is, array of detection units is at ground floor, drive layer 2013 at the second layer, the second layer is positioned at below ground floor, now, layer 2013 is driven to be linked to be sheet, also the below just right with each identification module 2011 can be positioned at.
In the embodiment of the present application, identification module 2011 is for detecting finger print information, and shading ring 2012, for shielding the signal cross-talk between identification module 2011, drives layer 2013 for driving identification module.Wherein, in order to meet main flow fingerprint image 508PPI (Chinese: number of pixels; English: Pixels Per Inch), identification module 2011 is of a size of 50 microns.Identification module 2011 is specially capacitance type sensor.Identification module 2011 and shading ring 2012 all can adopt top metal to realize in semiconductor processing, the material of driving layer 2013 is: the second layer metal in semiconductor technology, or other layer of metal in semiconductor technology except described second layer metal, or the poly layer in semiconductor technology.
As shown in Figure 2, because each identification module 2011 conductively-closed ring 2012 surrounds, so shading ring 2012 eliminates the signal cross-talk between adjacent identification module 2011, improve the spatial resolution of fingerprint image.
In the embodiment of the present application, identification module 2011 is rectangle, and the identification module of rectangle is circular or rectangular array according to predetermined arranging rule arrangement.
Specifically, identification module 2011 can carry out orderly arrangement according to predetermined arranging rule, such as arrangement is the rectangular array shown in Fig. 2, or arrangement is circular array, also or arrangement for oval-shaped array, certainly also have other arrangement mode or arrangement, just do not enumerate in the embodiment of the present application.
Identification module 2011 can be arranged according to certain spacing, and spacing here can set, thus forms the structure shown in Fig. 2, this ensures that theres the regular arrangement of identification module.
In the embodiment of the present application, there is between identification module 2011 and shading ring 2,012 first distance, shading ring 2012 and drive between layer 2013 there is second distance, between adjacent driving layer 2013, there is the 3rd distance.
Specifically, single detecting unit comprises three parts: identification module 2011, shading ring 2012 and driving layer 2013, all at regular intervals each other between three parts: there is between identification module 2011 and shading ring 2,012 first distance, between shading ring 2012 and driving layer 2013, there is second distance, between adjacent driving layer 2013, there is the 3rd distance, accordingly, between adjacent identification module 2011, there is certain distance, can ensureing like this when carrying out fingerprint detection, between adjacent identification module 2011, larger impact can not be produced; Between adjacent driving layer 2013, there is certain distance, so also can ensureing, when carrying out fingerprint detection, between adjacent driven layer, larger impact can not be produced; Between identification module 2011 and driving layer 2013, there is certain distance, ensureing when carrying out fingerprint detection like this, drive between layer 2013 and identification module 2011 and can not influence each other.Certainly, the first distance, second distance and the 3rd distance can be identical.Finger print detection device can be made like this to generate comparatively simple, and easy to operate.
As shown in Figure 2, in the embodiment of the present application, finger print detection device also comprises:
Becket 21, surrounds array of detection units 20, and becket 21 ground connection, for the protection of array of detection units 20.
Specifically, because becket 21 surrounds array of detection units 20, and becket 21 ground connection, as shown in Figure 2, so becket 21 can protect array of detection units 20 not by the interference of outer signals, improve accuracy and the precision of fingerprint detection.
In the embodiment of the present application, finger print detection device also comprises: fingerprint sensing element 23, is connected with array of detection units 21.
As shown in Figure 3, Fig. 3 is the structural representation of fingerprint sensing element in the embodiment of the present application.Fingerprint sensing element 23 comprises: unity gain amplifier module 231, multiple input single output switch 232, correlated-double-sampling detuner 233, variable gain amplifier 234 and analog-to-digital conversion module 235.
Wherein, a detecting unit 201 in a corresponding array of detection units 20 of unity gain amplifier module 231, be connected with the identification module 2011 in the detecting unit 201 corresponding to it and shading ring 2012, an input cutter head of multiple input single output switch 232 connects a unity gain amplifier module 231, because multiple input single output switch 232 has multiple input cutter head, so the identification module 2011 that can connect in multiple detecting unit 201 and shading ring 2012, and then connect array of detection units 20, the two sampling detuner 233 of output cutter head join dependency of multiple input single output switch 232, correlated-double-sampling detuner 233 connects variable gain amplifier 234, variable gain amplifier 234 connects analog-to-digital conversion module 235.
The shading ring 2012 of unity gain amplifier module 231 for driving it to connect, changes with identification module 2011 to make shading ring 2012.
Specifically, please refer to Fig. 4, Fig. 4 is that of unity gain amplifier module in the embodiment of the present application realizes structural drawing.In the embodiment of the present application, by source-electrode degradation technology, reduce the thermonoise of first order load, achieve low noise and read.Figure 4 shows that the structural representation of low-noise operational amplifier.Should be noted that, the structure that realizes of the unity gain amplifier module 231 in the embodiment of the present application is not limited to Fig. 4, Fig. 4 is only and illustrates, in actual application, every have the circuit structure reducing noise, all can be used as the unity gain amplifier module 231 in the embodiment of the present application, just repeat no longer one by one at this.
Please refer to Fig. 5, Fig. 5 is the principle of work schematic diagram of unity gain amplifier in the embodiment of the present application.In Fig. 4, G is the finger of the user of electronic equipment.When the finger contact of user being detected to the M in array of detection units 20 detecting unit, concrete, when the finger contact of user being detected to detecting unit A in array of detection units 20, accordingly, the finger contact of user is to the identification module A of detecting unit A, the drive singal (such as: sinusoidal signal, square-wave signal etc.) that then driving circuit provides can be loaded into the driving layer D of detecting unit A, and then drive singal is emitted to the skin corium of finger of user.
In order to reduce the impact that between the identification module A of detecting unit A and shading ring B, electric capacity is introduced, unity gain amplifier E is by driven shield ring B, shading ring B is changed with identification module A, eliminates the impact of stray capacitance between identification module A and shading ring B, improve the resolution of fingerprint image.Drive singal F is loaded into and drives on layer D, then the voltage at identification module A place is Capacitive Voltage Divider:
Wherein, VF is the amplitude of drive singal, Cad drives the electric capacity between layer D and identification module A, Cag is the electric capacity between identification module A and finger, Cag along with finger skin corium ridge or paddy be changed to change, such as: the electric capacity Cag between identification module A and finger ridge is 1.1f, the electric capacity Cag between identification module A and finger paddy is 1f, f is constant.
The amplitude proportional of finger ridge voltage and finger valley voltage and drive singal.For example, when drive singal is 5 volts, finger ridge voltage
volt, finger valley voltage
volt; When drive singal is 10 volts, finger ridge voltage
Volt, finger valley voltage
Volt.
Accordingly, after acquisition finger ridge voltage and finger valley voltage, the voltage differential signal that finger can obtain finger ridge voltage and point between valley voltage can be obtained.Such as: when the amplitude of drive singal is 5 volts, the voltage differential signal between finger ridge voltage and finger valley voltage is 12 millivolts.
In the embodiment of the present application, due to unity gain amplifier E also with multiple input single output switch 232, correlated-double-sampling detuner 233, variable gain amplifier 234 is connected with analog-to-digital conversion module 235, so voltage differential signal can transfer to multiple input single output switch, and then transfer to correlated-double-sampling detuner 233, correlated-double-sampling detuner 233 effectively can eliminate offset voltage and the low-frequency noise of front-end circuit, the quality of further raising fingerprint image, voltage differential signal transfers to variable gain amplifier 234 after correlated-double-sampling detuner 233 adjusts, such as: PGA variable gain amplifier, voltage differential signal after adjustment amplifies by variable gain amplifier 234, adjustment is about to the amplitude of the voltage differential signal being input to analog-to-digital conversion module, that reduces analog-to-digital conversion module realizes difficulty.Voltage differential signal after amplification is transferred to analog-to-digital conversion module 235 by variable gain amplifier 234, and the voltage differential signal after amplification is converted to digital signal by analog-to-digital conversion module 235, by analyzing digital signal, can obtain finger print information.
In sum, the finger print detection device that the embodiment of the present application provides is compared with finger print detection device of the prior art, no longer drive singal is loaded into around on the becket of array of detection units setting, but drive singal is loaded on the driving layer that arranges around single identification module, reduce the load that drive singal needs to drive, reduce the power consumption of finger print detection device.Each identification module is surrounded by a shading ring simultaneously, namely has separate screen layer between each identification module, reduces the signal cross-talk between identification module, improve the quality of fingerprint image.Fingerprint sensing element adopts Correlated Double Sampling, eliminates low-frequency noise, further increases the quality of fingerprint image.
Based on same inventive concept, a kind of finger print detection device in corresponding the embodiment of the present application, present invention also provides a kind of method of fingerprint detection, the method is applied in above-mentioned finger print detection device, be illustrated in figure 6 the process flow diagram of the method for a kind of fingerprint detection in the embodiment of the present application, the method comprises:
Step 61: during M detecting unit in array of detection units described in finger contact user being detected, according to preset rules, obtain the first finger print information of first identification module in a described M detecting unit, wherein, described preset rules is that first identification module in a described M detecting unit connects described correlated-double-sampling detuner, described variable gain amplifier and described analog-to-digital conversion module by described multiple input single output switch, surrounds first of described first identification module and drives layer to be connected to driving circuit.
First, finger print detection device comprises: array of detection units, comprises the detecting unit that M arranges according to predetermined arranging rule, M be more than or equal to 1 positive integer; Wherein, each detecting unit in described array of detection units comprises: identification module, for detecting finger print information; Shading ring, surrounds described identification module, for shielding the signal cross-talk between described identification module; Drive layer, described driving layer is connected with described shading ring, for driving described identification module.
In the embodiment of the present application, preset rules can connect described correlated-double-sampling detuner, described variable gain amplifier and described analog-to-digital conversion module for first identification module in M detecting unit by described multiple input single output switch, surrounds first of described first identification module and drives layer to be connected to driving circuit.
Step 62: according to described preset rules, obtains second finger print information that identification module detects to M identification module in a described M detecting unit successively.
Obtain finger print information corresponding to the first identification module by above-mentioned mode in a step 61, in the same way, second identification module also can be corresponding finger print information detected, then be the detection that the 3rd identification module carries out finger print information, last M identification module carries out the detection of finger print information.
Here it should be noted that, the testing process of finger print information is generally that first identification module of first row is as the identification module detected at first, then the horizontal detection carrying out finger print information successively one by one, can certainly be the vertical detection carrying out finger print information successively one by one, until last M identification module.
Step 63: based on second finger print information that identification module detects to M identification module in described first finger print information and described M detecting unit, obtain complete finger print information.
Last based on the first finger print information and all second finger print informations that identification module detects to M identification module detected, obtain the complete finger print information of the finger of user.
Further, in the embodiment of the present application, above-mentioned method is the mode that a kind of identification module carries out detecting fingerprint, can certainly be the detection being carried out finger print information by following mode:
Described in finger contact user being detected during first identification module, the ground floor surrounding described first identification module drives layer to be connected to driving circuit, and the drive singal that described driving circuit provides is loaded on described ground floor and drives layer;
Described ground floor drives layer to drive described first identification module, obtains the voltage differential signal between finger ridge voltage signal and finger valley voltage signal;
Described fingerprint sensing element processes described voltage differential signal, obtains described first finger print information.
Wherein, described fingerprint sensing element processes described voltage differential signal, obtains described first finger print information, specifically comprises:
The described unity gain amplifier module that described voltage differential signal transmission connects as described first identification module, described voltage differential signal is transferred to described multiple input single output switch by described unity gain amplifier module;
Described voltage differential signal transfers to described correlated-double-sampling detuner by described multiple input single output switch, voltage differential signal after being adjusted after described correlated-double-sampling detuner adjusts front-end circuit, transfers to described variable gain amplifier by the voltage differential signal after described adjustment;
Described variable gain amplifier amplifies the voltage differential signal after described adjustment, and the voltage differential signal after amplifying is sent to described analog-to-digital conversion module;
Described analog-to-digital conversion module carries out analog to digital conversion to the voltage differential signal after described amplification, obtains described first finger print information.
Such as: as shown in Figure 5, when the finger contact of user being detected to detecting unit A in array of detection units 20, accordingly, the finger contact of user is to the identification module A of detecting unit A, because identification module A is connected with unity gain amplifier E, and one of unity gain amplifier E and multiple input single output switch inputs cutter head and is connected, so by multiple input single output switch, identification module A and correlated-double-sampling detuner, variable gain amplifier and analog-to-digital conversion module can be coupled together.The driving layer D of encirclement identification module A can receive the drive singal (such as: sinusoidal signal, square-wave signal etc.) that driving circuit provides simultaneously, and then the driving layer D of detecting unit A can be loaded into, and then drive singal is emitted to the skin corium of finger of user, thus identification module A just can detect corresponding finger print information.
After identification module A has detected, the identification module B that identification module A is laterally adjacent has continued to detect finger print information, and then according to the rule laterally detected, carrying out successively detects each module, until last detection module.Certainly, in the embodiment of the present application, after identification module A has detected, the identification module S that identification module A is vertically adjacent has continued to detect finger print information, and then according to the vertical rule detected, carrying out successively detects each module, until last detection module.That is can be detected the finger print information of the finger of user in the embodiment of the present application by different detection modes, ensure that fingerprint detection module detects the accuracy of fingerprint like this.
Further, in the embodiment of the present application, when being detected by above-mentioned mode, drive singal F is loaded into and drives on layer D, then the voltage at identification module A place is Capacitive Voltage Divider:
Wherein, VF is the amplitude of drive singal, and Cad drives the electric capacity between layer D and identification module A, and Cag is the electric capacity between identification module A and finger.
Above-mentioned introduce finger print detection device time by the agency of, utilize above-mentioned formula can obtain finger ridge voltage V_
ridgewith finger valley voltage V_
valley, after acquisition finger ridge voltage and finger valley voltage, the voltage differential signal that finger can obtain finger ridge voltage and point between valley voltage can be obtained.
Voltage differential signal can transfer to multiple input single output switch, and then transfer to correlated-double-sampling detuner 233, correlated-double-sampling detuner 233 effectively can eliminate offset voltage and the low-frequency noise of front-end circuit, the quality of further raising fingerprint image, voltage differential signal transfers to variable gain amplifier 234 after correlated-double-sampling detuner 233 adjusts, such as: PGA variable gain amplifier, voltage differential signal after adjustment amplifies by variable gain amplifier 234, adjustment is about to the amplitude of the voltage differential signal being input to analog-to-digital conversion module, that reduces analog-to-digital conversion module realizes difficulty.Voltage differential signal after amplification is transferred to analog-to-digital conversion module 235 by variable gain amplifier 234, and the voltage differential signal after amplification is converted to digital signal by analog-to-digital conversion module 235, by analyzing digital signal, can obtain finger print information.
Although described the preferred embodiment of the application, one of ordinary skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the application's scope.
Obviously, those skilled in the art can carry out various change and modification to the application and not depart from the spirit and scope of the application.Like this, if these amendments of the application and modification belong within the scope of the application's claim and equivalent technologies thereof, then the application is also intended to comprise these change and modification.
Claims (6)
1. a finger print detection device, is characterized in that, comprising:
Array of detection units, comprises the detecting unit that M arranges according to predetermined arranging rule, M be more than or equal to 1 positive integer;
Wherein, each detecting unit in described array of detection units comprises:
Identification module, for detecting finger print information;
Shading ring, surrounds described identification module, for shielding the signal cross-talk between described identification module;
Drive layer, described driving layer is connected with described shading ring, for driving described identification module.
2. finger print detection device as claimed in claim 1, is characterized in that, described driving layer surround described shading ring or
Described identification module is arranged at the ground floor of described array of detection units, and described driving layer is arranged at the second layer of described array of detection units, and wherein, described ground floor is positioned at the top of the described second layer.
3. finger print detection device as claimed in claim 1, it is characterized in that, described finger print detection device also comprises:
Fingerprint sensing element, is connected with described array of detection units;
Described fingerprint sensing element comprises:
Unity gain amplifier module, a detecting unit in a corresponding described array of detection units of unity gain amplifier module, being connected with described identification module and described shading ring, for driving described shading ring, changing to make described shading ring with described identification module;
Multiple input single output switch, an input cutter head of described multiple input single output switch connects a unity gain amplifier module;
Correlated-double-sampling detuner, is connected with the output cutter head of described multiple input single output switch;
Variable gain amplifier, is connected with described correlated-double-sampling detuner;
Analog-to-digital conversion module, is connected with described variable gain amplifier.
4. finger print detection device as claimed in claim 1, it is characterized in that, described identification module is rectangle, and the identification module of rectangle is circular or rectangular array according to predetermined arranging rule arrangement.
5. the finger print detection device as described in claim arbitrary in claim 1-4, it is characterized in that, there is between described identification module and described shading ring the first distance, between described shading ring and described driving layer, there is second distance, between adjacent described driving layer, there is the 3rd distance.
6. the finger print detection device as described in claim arbitrary in claim 1-4, is characterized in that, described finger print detection device also comprises:
Becket, surrounds described array of detection units, and described becket ground connection, for the protection of described array of detection units.
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| CN201520053427.8U CN204537158U (en) | 2015-01-26 | 2015-01-26 | A kind of finger print detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105893921A (en) * | 2015-01-26 | 2016-08-24 | 胡家安 | Fingerprint detection device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105893921A (en) * | 2015-01-26 | 2016-08-24 | 胡家安 | Fingerprint detection device and method |
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