CN107808112B - Dermatoglyph recognition device and method - Google Patents
Dermatoglyph recognition device and method Download PDFInfo
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- CN107808112B CN107808112B CN201610812696.7A CN201610812696A CN107808112B CN 107808112 B CN107808112 B CN 107808112B CN 201610812696 A CN201610812696 A CN 201610812696A CN 107808112 B CN107808112 B CN 107808112B
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- sensing
- dermatoglyph
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- impedance element
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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
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- 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 dermatoglyph identification device and an identification method thereof. The dermatoglyph identification device comprises a switching circuit, a signal source and a plurality of sensors, wherein the signal source is selectively connected with the sensors through impedance elements. The switching circuit switches at least one of the sensors to be connected to the impedance element and connects the remaining sensors to the ground of the signal source. The dermatoglyph identification device identifies dermatoglyphs according to sensing signals generated by a sensor connected to an impedance element responding to a reference signal of a signal source.
Description
Technical Field
The present invention relates to an identification device, and more particularly, to a dermatoglyph identification device and an identification method thereof.
Background
In the present electronic products, more and more devices have a fingerprint recognition function, such as a mobile phone and a tablet computer. Fingerprint recognition is becoming more widely used, for example, to identify a user. When detecting the concave-convex change of the fingerprint, the capacitance value generated by the fingerprint sensor is very small, so that the fingerprint capacitance value to be detected is seriously attenuated when a parasitic capacitor exists or a human body is not grounded with the fingerprint detection chip, and the fingerprint identification is difficult. Generally, to solve this problem, a copper ring having the same ground potential as that of the internal fingerprint detection chip is disposed on the mobile phone, and when a user performs fingerprint identification, the user simultaneously contacts the sensor and the copper ring, so that one end of the sensing capacitor and the internal fingerprint detection chip have the same ground potential, thereby preventing the floating connection of one end of the sensing capacitor and further increasing the fingerprint identification degree.
Disclosure of Invention
The invention provides a dermatoglyph identification device and an identification method thereof, which can accurately identify fingerprints without arranging a copper ring.
The dermatoglyph recognition device comprises a plurality of sensors, a switching circuit and a signal source. The sensor is used for detecting dermatoglyph. The switching circuit is coupled with the grounding ends of the sensor and the signal source. The signal source is coupled to the switching circuit through the impedance element, and the signal source generates a reference signal. The switching circuit switches at least one sensor to be connected to the impedance element and switches the rest of the sensors to be connected to the ground, the at least one sensor responds to the reference signal to generate a sensing signal, and the dermatoglyph identification device identifies dermatoglyphs according to the sensing signal.
In an embodiment of the invention, the switching circuit alternately switches the sensors to be connected to the impedance element and switches the remaining sensors that are not switched to be connected to the impedance element to be connected to the ground terminal.
In an embodiment of the invention, when the sensing object touches the plurality of sensors, the sensing capacitor corresponding to the at least one sensor is connected in series between the impedance element and the ground terminal through the sensing object and the sensing capacitors corresponding to the other sensors.
In an embodiment of the invention, the sensing object is a finger.
In an embodiment of the invention, the dermatoglyph identification apparatus further includes a processing circuit, coupled to the impedance element and the switching circuit, for converting the sensing signal into the sensing information.
In an embodiment of the invention, the processing circuit includes an amplifier and an analog-to-digital conversion circuit. The amplifier is coupled to the impedance element and amplifies the sensing signal. The analog-to-digital conversion circuit is coupled to the amplifier and converts the amplified sensing signal into sensing information.
In an embodiment of the present invention, each of the sensors includes a sensing electrode.
The invention also provides a dermatoglyph identification method of the dermatoglyph identification device, wherein the dermatoglyph identification device comprises a signal source and a plurality of sensors, the signal source is selectively connected with the sensors through impedance elements, and the dermatoglyph identification method of the dermatoglyph identification device comprises the following steps. Switching the at least one sensor to be connected to the impedance element. And switching the rest sensors to be connected to the grounding end of the signal source. And identifying the dermatoglyph according to the sensing signal generated by the at least one sensor responding to the reference signal.
In an embodiment of the invention, the dermatoglyph identification method of the dermatoglyph identification device includes alternately switching and connecting the sensor to the impedance element.
In an embodiment of the invention, the dermatoglyph identification method of the dermatoglyph identification device includes that when a sensing object touches the plurality of sensors, a sensing capacitor corresponding to the at least one sensor is connected in series between the impedance element and a ground terminal through the sensing object and sensing capacitors corresponding to the other sensors.
Based on the above, the dermatoglyph identification apparatus according to the embodiment of the invention switches at least one sensor to be connected to the impedance element and switches the other sensors to be connected to the ground terminal of the signal source, so that the sensor connected to the impedance element can generate the sensing signal on the impedance element in response to the reference signal provided by the signal source, and the effect of grounding the sensing capacitor and the signal source together can be achieved without disposing a copper ring, thereby accurately performing fingerprint identification.
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a schematic diagram of a dermatoglyph identification apparatus according to an embodiment of the invention.
Fig. 2 is an equivalent circuit diagram of a dermatoglyph identification apparatus according to an embodiment of the invention.
Fig. 3 is a flowchart illustrating an identification method of a dermatoglyph identification apparatus according to an embodiment of the invention.
Description of the figures
102: sensor with a sensor element
104: switching circuit
106: signal source
108: impedance element
110: processing circuit
112: sensing an object
202: amplifier with a high-frequency amplifier
204: analog-to-digital conversion circuit
Cf. Cf 0: sensing capacitance
S302 to S306: identification method steps of dermatoglyph identification device
Detailed Description
Fig. 1 is a schematic diagram of a dermatoglyph identification apparatus according to an embodiment of the invention, please refer to fig. 1. The dermatoglyph identification apparatus includes a plurality of sensors 102, a switching circuit 104, a signal source 106 and a processing circuit 110, wherein the switching circuit 104 is coupled to each of the sensors 102 and the processing circuit 110, the signal source 106 is coupled to the switching circuit 104 and the processing circuit 110 through an impedance element 108, wherein the impedance element 108 may be, for example, a resistance element or an equivalent resistance of a circuit wire, but not limited thereto.
The sensor 102 is used to detect a sensing object 112, such as a fingerprint of a finger, but not limited thereto, and may also detect other portions of a skin pattern, for example, the sensor 102 may include sensing electrodes, and the sensing electrodes of the sensor 102 may form a sensing array to define a sensing region for performing sensing identification of the skin pattern. The signal source 106 may generate a reference signal such that the sensor 102 generates a sensing signal in response to the reference signal. When the sensing object 112 touches the sensors 102 for identifying the dermatoglyph, the switching circuit 104 can switch at least one of the sensors 102 to be connected to the impedance element 108 and switch the remaining sensors to be connected to the ground of the signal source 106, wherein the ground is connected to the ground. In this case, the reference signal provided by the signal source 106 can be transmitted to the sensor 102 connected to the impedance element 108 through the impedance element 108, so that the sensor 102 connected to the impedance element 108 can generate the sensing signal in response to the reference signal, so that the dermatoglyph identification apparatus can identify the dermatoglyph according to the sensing signal. For example, the processing circuit 110 may convert the sensing signal into sensing information for dermatoglyph identification.
Fig. 2 is a schematic diagram of an equivalent circuit of a dermatoglyph identification apparatus according to an embodiment of the invention, please refer to fig. 2. Further, when the sensing object 112 (e.g., a finger) touches the sensor 102 for identifying the dermatoglyph, a sensing capacitance Cf is generated between each sensor 102 and the sensing object 112. In the present embodiment, only one sensor 102 is switched by the switching circuit 104 to be connected to the impedance element 108, and the other sensors 102 are switched to be connected to the ground terminal of the signal source 106, wherein the sensing capacitances Cf corresponding to the sensors 102 switched to be connected to the ground terminal of the signal source 106 are connected in parallel, which can be equivalent to the sensing capacitance Cf0 shown in fig. 2, that is, the capacitance value of the sensing capacitance Cf0 is equal to the sum of the sensing capacitances Cf corresponding to the sensors 102 switched to be connected to the ground terminal of the signal source 106.
As shown in fig. 2, the sensing capacitor Cf corresponding to the sensor 102 switched to be connected to the impedance element 108 is connected in series between the impedance element 108 and the ground through the sensing object 112 and the sensing capacitor Cf0 corresponding to the sensor 102 switched to be connected to the ground of the signal source 106, and since the capacitance value of the sensing capacitor Cf0 is much larger than that of the sensing capacitor Cf, the capacitance value of the sensing capacitor Cf0 and the sensing capacitor Cf connected in series is almost equal to that of the sensing capacitor Cf. In this way, the sensing signal outputted at the common junction of the impedance element 108 and the sensing capacitor Cf only reflects the capacitance value sensed by the sensor 102 switched to be connected to the impedance element 108, and since the sensing capacitor Cf0 and the sensing capacitor Cf of fig. 2 are connected in series between the impedance element 108 and the ground, there is no problem of floating of one end of the capacitor, so that the capacitance value sensed by the sensor 102 switched to be connected to the impedance element 108 can be accurately reflected. In addition, the processing circuit 110 in this embodiment may include, for example, an amplifier 202 and an analog-to-digital conversion circuit 204, wherein the amplifier 202 is coupled to the impedance element 108 and the analog-to-digital conversion circuit 204. The amplifier 202 amplifies the sensing signal, and the analog-to-digital conversion circuit 204 converts the amplified sensing signal into sensing information for identifying the dermatoglyph.
The switching circuit 104 can alternately switch and connect each sensor 102 to the impedance element 108, and simultaneously switch and connect the other sensors 102 that are not switched and connected to the impedance element 108 to the ground, so as to sequentially obtain the sensing signals generated by each sensor 102, and further obtain the capacitance value change of each position on the sensing array, thereby accurately obtaining the dermatoglyph characteristics of the sensing object.
Fig. 3 is a flowchart illustrating an identification method of a dermatoglyph identification apparatus according to an embodiment of the invention, please refer to fig. 3. As can be seen from the above embodiments, the identification method of the dermatoglyph identification device may include the following steps. First, at least one sensor is switched to be connected to an impedance element to connect a signal source through the impedance element (step S302). Then, the remaining sensors are switched to be connected to the ground of the signal source (step S304). Then, the dermatoglyph is identified according to the sensing signal generated by the sensor connected to the impedance element responding to the reference signal (step S306). When the sensing object touches the sensor, the sensing capacitance corresponding to the sensor connected to the impedance element is connected in series between the impedance element and the ground terminal through the sensing object and the sensing capacitances corresponding to the other sensors, so that the sensing signal only reflects the capacitance value sensed by the sensor switched to be connected to the impedance element, and the problem of floating of one end of the capacitance is avoided, thereby accurately reflecting the capacitance value sensed by the sensor switched to be connected to the impedance element. By alternately switching and connecting the sensors to the impedance elements and simultaneously switching and connecting the other sensors which are not switched and connected to the impedance elements to the grounding end, the sensing signals generated by the sensors can be sequentially obtained, and the dermatoglyph characteristics of the sensing object can be accurately obtained.
In summary, in the dermatoglyph identification apparatus according to the embodiment of the invention, at least one sensor is switched to be connected to the impedance element, and the other sensors are switched to be connected to the ground terminal of the signal source, so that the sensor connected to the impedance element can generate the sensing signal on the impedance element in response to the reference signal provided by the signal source. Therefore, the effect of common grounding of the sensing capacitor and the signal source can be achieved without the copper ring, and the problem of floating connection of one end of the capacitor is solved, so that the fingerprint identification can be accurately carried out.
Although the present invention has been described with reference to the above embodiments, it should be understood that the invention is not limited thereto, and various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (8)
1. A dermatoglyph identification device comprising:
a plurality of sensors that detect dermatoglyphs;
a switching circuit coupled to the plurality of sensors,
the signal source is coupled to the switching circuit through an impedance element, the grounding end of the signal source is coupled to the switching circuit, the signal source generates a reference signal, the switching circuit switches at least one sensor to be connected to the impedance element and switches the rest sensors to be connected to the grounding end, the at least one sensor responds to the reference signal to generate a sensing signal, and the dermatoglyph identification device identifies the dermatoglyph according to the sensing signal.
2. The dermatoglyph apparatus of claim 1 wherein the switching circuit alternately switches the plurality of sensors to the impedance element and switches the remaining sensors that are not switched to the impedance element to the ground.
3. The dermatoglyph identification device of claim 1, wherein when a sensing object touches the plurality of sensors, the sensing capacitor corresponding to the at least one sensor is connected in series between the impedance element and the ground terminal through the sensing object and the sensing capacitors corresponding to the remaining sensors.
4. The dermatoglyph identification device of claim 3 wherein the sensing object is a finger.
5. The dermatoglyph identification device of claim 1 further comprising:
the processing circuit is coupled with the impedance element and the switching circuit and converts the sensing signal into sensing information.
6. The dermatoglyph identification device of claim 5 wherein the processing circuit comprises:
the amplifier is coupled with the impedance element and amplifies the sensing signal; and
an analog-to-digital conversion circuit coupled to the amplifier and converting the amplified sensing signal into the sensing information.
7. A dermatoglyph identification device as recited in claim 1, wherein each of the sensors includes a sensing electrode.
8. A dermatoglyph identification method of a dermatoglyph identification device, wherein the dermatoglyph identification device comprises a signal source and a plurality of sensors, the signal source is selectively connected with the sensors through impedance elements, the signal source generates a reference signal, and the dermatoglyph identification method of the dermatoglyph identification device comprises the following steps:
switching at least one sensor to be connected to the impedance element;
switching the rest sensors to be connected to the grounding end of the signal source;
the dermatoglyph is identified according to a sensing signal generated by the at least one sensor responding to the reference signal.
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| CN201610812696.7A CN107808112B (en) | 2016-09-09 | 2016-09-09 | Dermatoglyph recognition device and method |
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| CN201610812696.7A CN107808112B (en) | 2016-09-09 | 2016-09-09 | Dermatoglyph recognition device and method |
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| US11450132B2 (en) * | 2020-05-15 | 2022-09-20 | Novatek Microelectronics Corp. | Fingerprint driving circuit, fingerprint sensing device, electronic apparatus and operation method |
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