CN107808112A - Dermatoglyph identification device and its recognition methods - Google Patents
Dermatoglyph identification device and its recognition methods Download PDFInfo
- Publication number
- CN107808112A CN107808112A CN201610812696.7A CN201610812696A CN107808112A CN 107808112 A CN107808112 A CN 107808112A CN 201610812696 A CN201610812696 A CN 201610812696A CN 107808112 A CN107808112 A CN 107808112A
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- Prior art keywords
- sensor
- dermatoglyph
- impedor
- identification device
- sensing
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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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
- G06V10/12—Details of acquisition arrangements; Constructional details thereof
- G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
- G06V10/147—Details of sensors, e.g. sensor lenses
Abstract
A kind of dermatoglyph identification device and its recognition methods.Dermatoglyph identification device includes switching circuit, signal source and multiple sensors, signal source and is selectively connected sensor by impedor.Switching circuit switches at least one sensor and is connected to impedor, and remaining sensor is connected to the earth terminal of signal source.Dermatoglyph identification device identifies dermatoglyph according to sensing signal caused by the reference signal in the sensor response signal source for being connected to impedor.
Description
Technical field
The invention relates to a kind of identification device, and in particular to a kind of dermatoglyph identification device and its identification side
Method.
Background technology
In present electronic product, increasing device has the function of fingerprint recognition, such as mobile phone, flat board calculate
Machine.The application of fingerprint recognition is more and more extensive, such as can be used to identify user's identity.When detecting fingerprint bumps change, its
Caused capacitance very little, therefore when with the presence of parasitic capacitance, or human body is with fingerprint detection chip not altogether in the case of ground,
The fingerprint capacitor value deep fades to be detected will be caused, and cause fingerprint recognition difficult.In general, asked to solve this
Topic, a copper ring with earthing potential identical with internal fingerprint detection chip can be configured on mobile phone, when user is referred to
When line identifies, sensor and copper ring can be touched simultaneously, and make one end of sense capacitance and internal fingerprint detection chip that there is phase
Same earthing potential, the situation that avoiding sense capacitance has one end suspension joint occurs, and then increases fingerprint recognition degree.
The content of the invention
The present invention provides a kind of dermatoglyph identification device and its recognition methods, still can be accurate in the case of being not necessary to configure copper ring
Really carry out fingerprint recognition.
The dermatoglyph identification device of the present invention includes multiple sensors, switching circuit and signal source.Sensor is detecting
Dermatoglyph.Switching circuit couples sensor and the earth terminal of signal source.Signal source is coupled to switching circuit, signal by impedor
Source produces reference signal.Switching circuit switches at least one sensor and is connected to impedor, and switches remaining sensor company
Earth terminal is connected to, above-mentioned at least one sensor produces sensing signal in response to reference signal, and dermatoglyph identification device is according to sensing
Signal identifies dermatoglyph.
In an embodiment of the present invention, sensor switching is alternately connected to impedor by above-mentioned switching circuit, and
By be not switched be connected to impedor remaining sensor switching be connected to earth terminal.
In an embodiment of the present invention, wherein when sensing the object above-mentioned multiple sensors of touching, above-mentioned at least one biography
Sense capacitance corresponding to sensor is serially connected with impedor by sensing object with the sense capacitance corresponding to remaining sensor
Between the earth terminal.
In an embodiment of the present invention, above-mentioned sensing object is finger.
In an embodiment of the present invention, above-mentioned dermatoglyph identification device also includes process circuit, its couple impedor with
Switching circuit, sensing signal is converted into sensitive information.
In an embodiment of the present invention, above-mentioned process circuit includes amplifier and analog to digital converter.Amplifier
Impedor is coupled, amplifies sensing signal.Analog to digital converter couples amplifier, and the sensing signal after amplification is turned
Change sensitive information into.
In an embodiment of the present invention, above-mentioned each sensor includes sensing electrode.
The present invention also provides a kind of dermatoglyph recognition methods of dermatoglyph identification device, and wherein dermatoglyph identification device includes signal source
And multiple sensors, signal source are selectively connected sensor, the dermatoglyph identification side of dermatoglyph identification device by impedor
Method comprises the following steps.Switch at least one sensor and be connected to impedor.Switch remaining sensor and be connected to signal source
Earth terminal.Dermatoglyph is identified according to sensing signal caused by above-mentioned at least one sensor response reference signal.
In an embodiment of the present invention, the dermatoglyph recognition methods of above-mentioned dermatoglyph identification device includes, alternately will sensing
Device switching is connected to impedor.
In an embodiment of the present invention, the dermatoglyph recognition methods of above-mentioned dermatoglyph identification device includes, wherein when sensing pair
During as touching above-mentioned multiple sensors, the sense capacitance corresponding to above-mentioned at least one sensor is by sensing object and remaining
Sense capacitance corresponding to sensor is serially connected between impedor and earth terminal.
Based on above-mentioned, the dermatoglyph identification device of the embodiment of the present invention is connected to impedance element by switching at least one sensor
Part, and switch the earth terminal that remaining sensor is connected to signal source, so that the sensor being connected with impedor can respond letter
Reference signal that number source provides and sensing signal is produced on impedor, still can reach in the case of copper ring is not configured makes sense
Surveying electric capacity and signal source has the effect of common ground, so as to carry out fingerprint recognition exactly.
For features described above of the invention and advantage can be become apparent, special embodiment below, and coordinate accompanying drawing detailed
It is described as follows.
Brief description of the drawings
Fig. 1 is the schematic diagram of the dermatoglyph identification device according to the embodiment of the present invention.
Fig. 2 is the schematic equivalent circuit of the dermatoglyph identification device according to embodiments of the invention.
Fig. 3 is the schematic flow sheet of the recognition methods of the dermatoglyph identification device according to embodiments of the invention.
Reference numeral explanation
102：Sensor
104：Switching circuit
106：Signal source
108：Impedor
110：Process circuit
112：Sense object
202：Amplifier
204：Analog to digital converter
Cf、Cf0：Sense capacitance
S302~S306：The recognition methods step of dermatoglyph identification device
Embodiment
Fig. 1 is the schematic diagram of the dermatoglyph identification device according to embodiments of the invention, refer to Fig. 1.Dermatoglyph identification device
Including multiple sensors 102, switching circuit 104, signal source 106 and process circuit 110, wherein switching circuit 104 couples respectively
Individual sensor 102 and process circuit 110, signal source 106 couple switching circuit 104 and processing electricity by impedor 108
Road 110, wherein impedor 108 may be, for example, the equivalent resistance of resistive element or circuit lead, but be not limited.
Sensor 102 is not limited to detect sensing object 112, such as the fingerprint of finger, and it also can be such as
The dermatoglyph at other positions is detected, sensor 102 may include sensing electrode, and the sensing electrode of sensor 102 can form sensing array,
To define the sensing identification that sensing area carries out dermatoglyph.Signal source 106 can produce reference signal, so that the response ginseng of sensor 102
Examine signal and produce sensing signal.When sensing the progress dermatoglyph identification of the touch sensor 102 of object 112, switching circuit 104 can be cut
Change at least one sensor 102 and be connected to impedor 108, and switch the ground connection that remaining sensor is connected to signal source 106
End, wherein earth terminal is connected to ground voltage.In this case, the reference signal that signal source 106 provides can pass through impedor
108 are transferred into the sensor 102 being connected with impedor 108, and the sensor 102 for making to be connected with impedor 108 can respond
Reference signal and produce sensing signal so that dermatoglyph identification device can identify dermatoglyph according to sensing signal.Such as process circuit
Sensing signal can be converted into sensitive information by 110, to carry out dermatoglyph identification.
Fig. 2 is the schematic equivalent circuit of the dermatoglyph identification device according to embodiments of the invention, refer to Fig. 2.Enter one
For step, when sensing the progress dermatoglyph identification of object 112 (such as finger) touch sensor 102, each sensor 102 and sensing
Sense capacitance Cf is produced between object 112.In the present embodiment, only one sensor 102 is switched the switching of circuit 104 and is connected to resistance
Anti- element 108, and remaining sensor 102 is switched the earth terminal for being connected to signal source 106, and signal source is connected to wherein being switched
It is annexation in parallel between sense capacitance Cf corresponding to the sensor 102 of 106 earth terminal, it can be equivalent to shown in Fig. 2
Sense capacitance Cf0, that is to say, that sense capacitance Cf0 capacitance, which is equal to, is switched the earth terminal that is connected to signal source 106
The summation of sense capacitance Cf corresponding to sensor 102.
As shown in Fig. 2 being switched the sense capacitance Cf being connected to corresponding to the sensor 102 of impedor 108 will pass through
Sensing object 112 concatenates with the sense capacitance Cf0 corresponding to the sensor 102 for being switched the earth terminal for being connected to signal source 106
Between impedor 108 and ground connection, because sense capacitance Cf0 capacitance is much larger than sense capacitance Cf capacitance, therefore
The sense capacitance Cf0 and sense capacitance Cf of series connection capacitance are by the capacitance no better than sense capacitance Cf.Consequently, it is possible to
The sensing signal exported on impedor 108 and sense capacitance Cf common joint, which only will react to be switched, is connected to impedance element
The capacitance that the sensor 102 of part 108 is sensed, and because Fig. 2 sense capacitance Cf0 and sense capacitance Cf are serially connected with impedance
Between element 108 and ground connection, therefore the problem of do not have electric capacity one end suspension joint, it is connected to so as to reflect to be switched exactly
The capacitance that the sensor 102 of impedor 108 is sensed.In addition, process circuit 110 in the present embodiment can for example including
Amplifier 202 and analog to digital converter 204, wherein amplifier 202 couple impedor 108 and analog-digital conversion electricity
Road 204.Amplifier 202 can amplify sensing signal, and analog to digital converter 204 then changes the sensing signal after amplification
Into sensitive information, to carry out dermatoglyph identification.
The switching of each sensor 102 alternately can be connected to impedor 108 by switching circuit 104, and simultaneously will not by
Remaining sensor 102 switching that switching is connected to impedor 108 is connected to earth terminal, to obtain each sensor in order
Sensing signal caused by 102, and then obtain sensing the capacitance variation of each position on array, so as to learn sense exactly
Survey the skin grain character of object.
Fig. 3 is the schematic flow sheet of the recognition methods of the dermatoglyph identification device according to embodiments of the invention, refer to figure
3.From above-described embodiment, the recognition methods of dermatoglyph identification device may include the following steps.First, at least one sensing is switched
Device is connected to impedor, to pass through impedor connecting signal source (step S302).Then, the connection of remaining sensor is switched
To the earth terminal (step S304) of the signal source.Then produced again according to the sensor response reference signal for being connected to impedor
Raw sensing signal identifies dermatoglyph (step S306).Wherein when sensing object touch sensor, impedor is connected to
Sense capacitance corresponding to sensor is serially connected with impedance element by sensing object with the sense capacitance corresponding to remaining sensor
Between part and earth terminal, consequently, it is possible to which sensing signal only reaction will be switched and be connected to the sensor of impedor and be sensed
The capacitance arrived, and the problem of do not have electric capacity one end suspension joint, impedor is connected to so as to reflect to be switched exactly
The capacitance that is sensed of sensor.By the way that sensor switching alternately is connected into impedor, and will not cut simultaneously
Change be connected to impedor remaining sensor switching be connected to earth terminal, you can obtain in order caused by each sensor
Sensing signal, and then the skin grain character of sensing object is learnt exactly.
In summary, the dermatoglyph identification device of embodiments of the invention is connected to impedance by switching at least one sensor
Element, and switch the earth terminal that remaining sensor is connected to signal source, so that the sensor being connected with impedor can respond
Signal source provide reference signal and sensing signal is produced on impedor.It is still reachable so in the case of copper ring is not configured
To making sense capacitance and signal source that there is the effect of common ground, the problem of without having electric capacity one end suspension joint, therefore can be accurate
Ground carries out fingerprint recognition.
Although the present invention is disclosed above with embodiment, but it is not limited to the present invention, any affiliated technology neck
Technical staff in domain, without departing from the spirit and scope of the present invention, it should can make a little change and retouching, therefore this hair
What bright protection domain should be defined by appended claims is defined.
Claims (10)
1. a kind of dermatoglyph identification device, including：
Multiple sensors, detect dermatoglyph；
Switching circuit, the plurality of sensor is coupled,
Signal source, the switching circuit is coupled to by impedor, there is earth terminal, the switching circuit couples the earth terminal, should
Signal source produces reference signal, and the switching circuit switches at least one sensor and is connected to the impedor, and switches remaining
Sensor is connected to the earth terminal, and at least one sensor responds the reference signal and produces sensing signal, dermatoglyph identification
Device identifies the dermatoglyph according to the sensing signal.
Connect 2. dermatoglyph identification device as claimed in claim 1, the wherein switching circuit alternately switch the plurality of sensor
It is connected to the impedor, and will not be switched remaining sensor switching for being connected to the impedor and be connected to the earth terminal.
3. dermatoglyph identification device as claimed in claim 1, wherein when sensing the object the plurality of sensor of touching, this at least one
Sense capacitance corresponding to individual sensor is serially connected with this by the sense capacitance corresponding to the sensing object and remaining sensor
Between impedor and the earth terminal.
4. dermatoglyph identification device as claimed in claim 3, wherein the sensing object are finger.
5. dermatoglyph identification device as claimed in claim 1, in addition to：
Process circuit, the impedor and the switching circuit are coupled, the sensing signal is converted into sensitive information.
6. dermatoglyph identification device as claimed in claim 5, the wherein process circuit include：
Amplifier, the impedor is coupled, amplify the sensing signal；And
Analog to digital converter, the amplifier is coupled, and the sensing signal after amplification is converted into the sensitive information.
7. dermatoglyph identification device as claimed in claim 1, wherein respectively the sensor includes sensing electrode.
8. a kind of dermatoglyph recognition methods of dermatoglyph identification device, wherein the dermatoglyph identification device include signal source and multiple sensings
Device, the signal source are selectively connected the plurality of sensor by impedor, the dermatoglyph recognition methods of the dermatoglyph identification device
Including：
Switch at least one sensor and be connected to the impedor；
Switch the earth terminal that remaining sensor is connected to the signal source；
Sensing signal caused by the reference signal is responded according at least one sensor to identify the dermatoglyph.
9. the dermatoglyph recognition methods of dermatoglyph identification device as claimed in claim 8, including：
The switching of the plurality of sensor is alternately connected to the impedor.
10. the dermatoglyph recognition methods of dermatoglyph identification device as claimed in claim 8, wherein when sensing object touches the plurality of biography
During sensor, sense of the sense capacitance corresponding to by the sensing object and remaining sensor corresponding at least one sensor
Capacitance series are surveyed between the impedor and the earth terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610812696.7A CN107808112B (en) | 2016-09-09 | 2016-09-09 | Dermatoglyph recognition device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610812696.7A CN107808112B (en) | 2016-09-09 | 2016-09-09 | Dermatoglyph recognition device and method |
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| Publication Number | Publication Date |
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| CN107808112A true CN107808112A (en) | 2018-03-16 |
| CN107808112B CN107808112B (en) | 2020-03-24 |
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| CN201610812696.7A Active CN107808112B (en) | 2016-09-09 | 2016-09-09 | Dermatoglyph recognition device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI776505B (en) * | 2020-05-15 | 2022-09-01 | 聯詠科技股份有限公司 | Fingerprint driving circuit, fingerprint sensing device, electronic apparatus and operation method |
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| CN107808112B (en) | 2020-03-24 |
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