KR20210106068A - Panel for biometric authentication and biometric authentication device using the same - Google Patents

Abstract

The present invention relates to a panel for biometric authentication and a biometric authentication device having the same. The present invention discloses a panel for biometric authentication, which includes: a first fingerprint sensing electrode unit having a rectangular shape having a planar shape with a vertical side longer than a horizontal side; a second fingerprint sensing electrode unit placed at a distance spaced apart by a first distance from the vertical side of the first fingerprint sensing electrode unit, and having a planar shape having a rectangular shape with a vertical side longer than a horizontal side; and a first bio-electrode and a second bio-electrode installed to be electrically spaced apart from each other in the space between the first fingerprint sensing electrode unit and the second fingerprint sensing electrode unit. According to the panel for biometric authentication and the biometric authentication device having the same of the present invention, it is difficult to apply a scheme of locally attaching a formed counterfeit fingerprint to only a part of the fingers, so that counterfeit fingerprint is removed with a higher probability, thereby increasing the reliability of authentication.

Description

A panel unit for biometric authentication and a biometric authentication device having the same

The present invention relates to a biometric panel unit and a biometric authentication device having the same, and more particularly, to a biometric authentication panel unit in which two long-direction fingerprint sensors are positioned and an electrode for biometric authentication is formed in a space therebetween, and the same. It relates to a biometric authentication device provided.

As a method of securing security in a small information device, a method of performing personal authentication using a password or an ID (IDentification) card is used. However, a password or ID card has a relatively high risk of being stolen, and thus stronger personal authentication (authentication that the user of the device is the user who is registered in advance) is required in fields such as financial transactions. In order to respond to these demands, biometric information (biometric information) is increasingly used, and fingerprints are mainly used among biometric information for convenience.

However, in the case of fingerprints, there is a problem in that authentication is easily penetrated by counterfeit fingerprints made of silicon or gummi. In order to solve such a problem with fingerprints, there is a proposal to use various biometric information using iris, blood flow or impedance, etc. Some biometric information has been technically implemented, but has not yet been commercially distributed for economic reasons.

For example, to briefly summarize biometric authentication technology using impedance, biometric authentication is performed by applying a voltage to a living body while varying a frequency, and measuring the impedance magnitude and phase of the living body according to the frequency change. In order to authenticate the living body using the impedance as described above, (1) a circuit for applying input power having a plurality of frequencies should be provided, and (2) a circuit capable of measuring the magnitude and phase of the impedance of the living body according to each frequency. There was a problem that had to be provided. In particular, in order to measure the magnitude and phase of the impedance, the measurement signal is multiplied by a sine sine wave and a cosine sine wave, and then passed through a low-pass filter to obtain the real and imaginary parts of the impedance response. have to measure In order to build such a circuit at a reliable level, it was difficult to commercialize it because the hardware configuration became complicated.

The inventors of the present application have applied for and registered two patents as disclosed in the following prior art documents (patent documents) in order to solve the hardware problem. 1 and 2 show a circuit configuration diagram of a biometric authentication device proposed in the following patent documents and an embodiment of an electrode provided in a panel unit. The biometric authentication device presented in the patent document includes a driving unit 200 , a panel unit 100 , a biometric sensing unit 300 , a biometric control unit 510 , and a biometric signal processing unit 530 . The panel unit 100 includes first and second biometric electrodes 101 and 103 for biometric authentication and a fingerprint sensing electrode for recognizing a fingerprint, and includes a human finger (other body parts to be measured as well as other body parts to be measured). Possible, Z) is the element on which it is placed. In the panel part 100 shown in FIG. 1, the fingerprint sensing electrode part is omitted. In a state where an object for biometric authentication is placed between the first bioelectrode 101 and the second bioelectrode 103, a square wave having a single cycle is applied to the first bioelectrode 101, and the first bioelectrode ( 101), the measured voltage width, which is the difference between the maximum (measured voltage maximum) and the minimum (measured voltage minimum), and the voltage measured at the first bioelectrode 101 reach a specific range from the minimum measured voltage to the maximum measured voltage It is a method of performing biometric authentication using the arrival time required to do so. 2 is a plan view showing the arrangement of the first bioelectrode 101, the second bioelectrode 103, and the fingerprint sensing electrode unit 105 formed in the panel unit of the patent document. As shown in FIG. 2 , the panel unit has a structure in which the first biometric electrode 101 and the second biometric electrode 103 for biometric authentication are formed outside the fingerprint sensing electrode unit 105 . However, due to this electrode structure, a fake fingerprint made of silicon is attached only to the part where the fingerprint sensing electrode part 105 is in contact with the biological finger, and the biological finger that is in contact with the first biological electrode 101 and the second biological electrode 103 is If the biometric part is exposed and touched as it is, the problem of easily passing biometric authentication was exposed.

1. Korea Patent Publication No. 10-2018-0114364 (published on October 18, 2018) 2. Korean Patent No. 10-2009463 (Registered on Aug. 5, 2019)

An object of the present invention is to solve the above problems, and an object of the present invention is to provide a panel part formed of an electrode having a structure in which it is difficult to easily pass biometric authentication using a forged fingerprint and a biometric authentication device having the same.

The above object of the present invention is to provide a first fingerprint sensing electrode part having a rectangular shape with a planar shape having a longitudinal side longer than a horizontal side, and a first fingerprint sensing electrode unit placed at a distance spaced apart from the longitudinal side by a first distance, A second fingerprint sensing electrode part having a rectangular shape having a vertical side longer than a horizontal side, and a first installed to be electrically spaced apart from each other in a space between the first fingerprint sensing electrode part and the second fingerprint sensing electrode part This can be achieved by a panel unit for biometric authentication, characterized in that it includes a bio-electrode and a second bio-electrode.

The above object of the present invention is to provide a first fingerprint sensing electrode part having a rectangular shape with a planar shape having a longitudinal side longer than a horizontal side, and a first fingerprint sensing electrode unit placed at a distance spaced apart from the longitudinal side by a first distance, A second fingerprint sensing electrode part having a rectangular shape whose vertical side length is longer than the horizontal side, and the second fingerprint sensing electrode unit being placed at a distance from the vertical side of the second fingerprint sensing electrode unit by a second distance, the planar shape having a vertical side length than the horizontal side The third fingerprint sensing electrode unit having a longer rectangular shape, the first biometric electrode and the second fingerprint sensing electrode unit and the third provided in a space between the first fingerprint sensing electrode unit and the second fingerprint sensing electrode unit It can also be achieved by the panel unit for biometric authentication, characterized in that it includes a second bioelectrode installed in the space between the fingerprint sensing electrodes.

When a counterfeit fingerprint is attached to a part of a living body by forming the height of the first or second biological electrode to be lower than the height of the first or second biological electrode part, the living body uses the first biological electrode or the second biological electrode It is desirable to configure it so that it does not easily come into contact with it.

Another object of the present invention is the above-described panel unit, a driving unit for applying a square wave having a single cycle to the first bioelectrode, and a voltage detected at the first electrode in a state in which the voltage measured at the first bioelectrode is stabilized. The time it takes for the detected voltage to reach the specified range of the measured voltage width obtained by the difference between the highest measured voltage and the lowest measured voltage This can be achieved by a biometric authentication device comprising: a sensing unit that outputs an arrival time that is a time; and a signal processing unit that determines whether a body is a living body using the measured voltage width and the arrival time input from the sensing unit.

It is preferable that the biometric authentication device further includes an additional resistor Re connected at one end to the driving unit and the other end connected to the first bioelectrode.

According to the panel unit and the biometric authentication device having the same according to the present invention, it is difficult to locally attach the formed counterfeit fingerprint to only a part of the finger, and even if it is attached, the living body can easily contact the first and second biological electrodes due to the thickness of the fake fingerprint material. Since it is difficult to pass biometric authentication with a fake fingerprint attached, the reliability of authentication can be increased.

1 is a circuit configuration diagram of a biometric authentication device proposed by the present inventors in prior patent documents.
2 is a configuration example of an electrode provided in a panel unit constituting a biometric authentication device proposed by the present inventors in prior patent documents.
3 is a circuit configuration diagram of a biometric authentication device according to an embodiment of the present invention.
4 is a rear view and a plan view of a fingerprint sensing electrode unit and an electrode for biometric authentication provided in the panel unit constituting the biometric authentication device according to the present invention.
5 is an explanatory view for explaining a situation in which it is difficult to form a forged fingerprint using the panel unit according to FIG. 4;
6 is a rear view of a panel unit having a bio-electrode and a fingerprint sensing electrode unit as an embodiment according to the present invention;
7 is a panel part of another embodiment according to the present invention.
8 is a flowchart for performing fingerprint and biometric authentication using a first fingerprint sensing electrode unit, a second fingerprint sensing electrode unit, and a bioelectrode according to the present invention.

The terms used in the present invention are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In this specification, terms such as "comprises" or "have" are intended to designate that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

In addition, in this specification, "on or on top of" means to be located above or below the target part, and does not necessarily mean to be located above the direction of gravity. Also, when a part of a region, plate, etc. is said to be “on or on” another part, it is not only when another part is in contact with or spaced “on or on” another part, but also when another part is in the middle. Including cases where there is

In addition, in this specification, when a component is referred to as "connected" or "connected" with another component, the component may be directly connected or directly connected to the other component, but in particular It should be understood that, unless there is a description to the contrary, it may be connected or connected through another element in the middle.

Also, in this specification, terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

3 is a circuit configuration diagram of a biometric authentication device according to an embodiment of the present invention. The biometric authentication device includes a driving unit 200 , a panel unit 100 , a biometric sensing unit 300a , a biometric control unit 510a , and a biometric signal processing unit 530a . The panel unit 100 is provided with a first biometric electrode 101 for biometric authentication, a second biometric electrode 103, and fingerprint sensing electrode units 105a and 105b for recognizing a fingerprint. is a small In FIG. 3, reference symbol 'Z' represents a human finger as an equivalent circuit, and 'Z-1' indicates that a human finger represents the first bioelectrode 101, the second bioelectrode 103, and the fingerprint sensing electrode part 105a. , 105b) is a reference symbol indicating an imaginary position placed on top.

A square wave having a single cycle is applied to the first bioelectrode 101 in a state where an object for biometric authentication is placed between the first bioelectrode 101 and the second bioelectrode 103, which are formed to be electrically spaced apart from each other. and the measured voltage width, which is the difference between the maximum (maximum measured voltage) and minimum (minimum measured voltage) of the voltage measured by the first biological electrode 101, and the voltage measured by the first biological electrode 101 are measured from the measured voltage minimum This is a method of performing biometric authentication using the arrival time required to reach a specific range of the maximum voltage.

In the circuit configuration diagram shown in FIG. 3, a fingerprint sensing unit sensing a signal output from the fingerprint sensing electrode units 105a and 105b, a fingerprint signal processing unit processing a signal output from the fingerprint sensing unit, and a device related to a fingerprint are controlled. The fingerprint control unit is omitted. Circuits and methods for processing fingerprints are commercially available in various ways and are outside the scope of the present invention, and thus descriptions are omitted. The circuit of the complex biometric authentication device includes a fingerprint sensing unit, a fingerprint control unit, and a fingerprint signal processing unit separately from the biometric sensing unit 300a, the biometric controller 510a, and the biosignal processing unit 530a. In contrast, when a simple biometric authentication device circuit is implemented, the biometric sensing unit 300a, the biometric control unit 510a, and the biosignal processing unit 530a perform similar functions to the corresponding fingerprint sensing unit, fingerprint control unit, and fingerprint signal processing unit, respectively. Of course, both devices can be integrated to implement biometric authentication and fingerprint authentication together.

In the biometric authentication device shown in FIG. 3, the fingerprint sensing electrode part and the biometric authentication electrode (the first biometric electrode and the second biometric electrode) are shown in a planar direction. In the biometric authentication device shown in FIG. 3, the fingerprint sensing electrode unit is divided into a first fingerprint sensing electrode unit 105a and a second fingerprint sensing electrode unit 105b, and the divided first fingerprint sensing electrode unit 105a and the second fingerprint sensing electrode unit 105b are divided. It is characterized in that the first biological electrode 101a and the second biological electrode 101b are provided in the space between the fingerprint sensing electrode parts 105b.

The fingerprint sensing electrode unit can be implemented in various ways such as a capacitive method, a resistive method, an ultrasonic method, etc. However, most recently, a capacitive method is applied. The fingerprint sensing electrode unit implemented in the capacitive method includes a plurality of electrodes, and by sensing the capacitance value induced by the valleys and ridges of the finger on the plurality of electrodes, a feature point of the fingerprint is extracted.

4 is a rear view and a plan view of a fingerprint sensing electrode unit and an electrode for biometric authentication provided in the panel unit constituting the biometric authentication device according to the present invention. 4(a) is a rear view of the panel part, and FIG. 4(b) is a plan view of the panel part. The fingerprint sensing electrode part is formed to be divided into a first fingerprint sensing electrode part 105a and a second fingerprint sensing electrode part 105b having a rectangular shape with a narrow width and a long length (planar) in contact with the skin of the finger, The first biometric electrode 101 and the second biometric electrode 103, which are electrodes for biometric authentication, are electrically connected to each other in the space formed between the first fingerprint sensing electrode unit 105a and the second fingerprint sensing electrode unit 105b. It is characterized in that it is arranged vertically so as to be spaced apart. In this case, it is preferable that the first fingerprint sensing electrode part 105a and the second fingerprint sensing electrode part 105b have the same shape.

5 is an explanatory view for explaining a situation in which it is difficult to form a forged fingerprint using the panel unit according to FIG. 4 . In FIG. 5 , Z2 denotes a finger skin in contact with the panel part, and f1 and f2 indicate a fake fingerprint formed of silicone, guar gum, or clay adhered to the finger skin. In FIG. 5, in an actual situation, the forged fingerprints f1 and f2 will be provided to be in close contact with the finger skin Z2, but for convenience of explanation, they are illustrated to be spaced apart from each other in the drawing. In order to pass biometric authentication using the panel unit of the present invention shown in FIG. 4 , as shown in FIG. 5 , a person's finger must directly touch the upper part of the bioelectrodes 101 and 103 , so only the skin of the fingers except for the corresponding area is made of silicone. Forged fingerprints (f1, f2) formed of , guar gum or clay must be precisely divided and attached. Since it is not easy to substantially form the forged fingerprints f1 and f2 in the form shown in FIG. 5 , there is an effect that biometric authentication can be performed more precisely according to the present invention.

FIG. 6 is a rear view of a panel unit including a bio-electrode and a fingerprint sensing electrode unit as an embodiment according to the present invention. Compared with FIG. 5 , there is a difference in configuration in that the height of the bioelectrode formed in the space between the two fingerprint sensing electrode units is lower than the height of the fingerprint sensing electrode unit. When a biometric fingerprint is placed on the upper part of the panel shown in FIG. 6 , when a slightly high pressure is applied, the finger skin protrudes into the interspace so that it can easily touch the bioelectrodes 101 and 103 . On the other hand, when the fake fingerprints f1 and f2 as shown in FIG. 5 are interposed on the biometric fingerprint by attachment, etc., even if pressure is applied to the finger while wearing the fake fingerprint on the top of the panel unit, silicon, guar gum Alternatively, due to the thickness of the fake fingerprint formed of clay, the fingerprint cannot reach the top of the bioelectrodes 101 and 103, so that authentication can be performed more strictly. According to various experiments of the present inventors, the width (dL) of the interspace caused by the separation between the fingerprint sensing electrodes is preferably formed to be 2 mm or less, and the height difference (dt) between the bio-electrode and the fingerprint sensing electrode is about 0.3 mm or less. It was nice to form.

7 is a panel part according to another embodiment according to the present invention. In the panel unit, the fingerprint sensing electrode units 105a, 105b, and 105c are divided into three, and the first bioelectrode 101 is disposed between the first fingerprint sensing electrode unit 105a and the second fingerprint sensing electrode unit 105b. and a second biological electrode 103 was formed between the second fingerprint sensing electrode unit 05b) and the third fingerprint sensing electrode unit 105c. As shown in FIGS. 7A and 7B , the bioelectrodes may be formed to be electrically spaced apart from each other, so that the horizontal positions may be variously arranged.

Hereinafter, the flow of performing fingerprint and biometric authentication using the first fingerprint sensing electrode unit 105a, the second fingerprint sensing electrode unit 105b, and the bioelectrodes 101 and 103 shown in FIG. It will be briefly described. Since the present invention uses the fingerprint sensing electrode divided into two, the user's finger contact may appear in various ways. For example, most of the user's fingerprints may contact only the first fingerprint sensing electrode unit 105a and hardly contact the second fingerprint sensing electrode unit 105b, or vice versa. Alternatively, the fingerprint of the user's finger may be placed to such an extent that it occupies almost the same area over both the first fingerprint sensing electrode unit 105a and the second fingerprint sensing electrode unit 105b.

In consideration of these various circumstances, when registering the user's fingerprint for the first time (1), the fingerprint is placed so as to span both the first fingerprint sensing electrode unit 105a and the second fingerprint sensing electrode unit 105b, but the first fingerprint sensing electrode The user's fingerprint is registered in a state in which the user's fingerprint is placed in contact with the portion 105a, and (2) the fingerprint is placed so that the fingerprint is placed on both sides of the first fingerprint sensing electrode unit 105a and the second fingerprint sensing electrode unit 105b. The user's fingerprint is registered in a state in which the user's fingerprint is placed in more contact with the second fingerprint sensing electrode unit 105b, and (3) the fingerprint is applied to both sides of the first fingerprint sensing electrode unit 105a and the second fingerprint sensing electrode unit 105b. However, it is preferable to store the fingerprint recognition state in various possible states, such as registering a fingerprint placed evenly on the fingerprint sensing electrode unit in two possible places.

A fingerprint is sensed using the first fingerprint sensing electrode unit 105a (S10), and a first matching score is calculated by comparing it with previously registered fingerprint data (S20). A fingerprint is sensed using the second fingerprint sensing electrode unit 105b (S30), and a second matching score is calculated by comparing it with the previously registered fingerprint data (S40). Of course, steps S20 and S40 may be performed in any order as long as the conditions to be performed before steps S10 and S30 are satisfied, respectively. For example, it may be performed in the order of S10, S30, S40, and S20, and it is also possible to be performed in the order of S10, S30, S20 and S40.

It is determined whether the fingerprint is authenticated using the first matching score and the second matching score (S50). Fingerprint authentication can be performed by various algorithms. The first method is a method of authenticating the fingerprint when a high matching score among the first matching score and the second matching score is greater than the first threshold and the low matching score is greater than the second threshold. Another second method is to authenticate the fingerprint when both the first matching score and the second matching score are greater than the third threshold. Finally, the third method is a method of authenticating the fingerprint when the matching score of the highest value among the first matching score and the second matching score is greater than the fourth threshold value. As a specific example, it is assumed that the first threshold value, the second threshold value, the third threshold value, and the fourth threshold value are 80%, 50%, 70%, and 88%, respectively. A case in which the first matching score and the second matching score are calculated to be 85% and 61% will be described under this assumption. It will be explained that the matching score and threshold are calculated as 100% when the registered fingerprint and the fingerprint sensed by the fingerprint sensing electrode completely match, and 0% when they do not match at all. Under this assumption, how a fingerprint is authenticated according to the first to third methods presented above will be described.

According to the first method, the higher matching score (first matching score, 85%) among the first matching score (85%) and the second matching score (61%) is greater than and lower than the first threshold value (80%). Since the value matching score (second matching score, 61%) has a value greater than the second threshold value (50%), it will be authenticated that the fingerprint is matched. According to the second method, the first matching score (85%) is greater than the third threshold value (70%), but the second matching score (61%) is smaller than the third threshold value (70%), so the fingerprint is It is determined that it does not match and the authentication cannot be passed. According to the third method, the highest matching score (first matching score, 85%) among the first matching score (85%) and the second matching score (61%) is smaller than the fourth threshold value (88%). It is determined that the fingerprints do not match, and authentication cannot be passed.

It can be seen that, depending on the authentication method applied in this way, whether the authentication passes or not varies even if the fingerprint is detected in the same situation. In addition, if all methods 1 to 3 are applied and loose authentication is adopted during fingerprint authentication, it can be determined that the fingerprint authentication has passed even if only one of them passes, and when strict authentication is adopted, If all three methods match, it may be determined that the fingerprint authentication has been passed, and it is of course also possible to determine whether the authentication of the two methods is passed as an intermediate level between the two methods.

In FIG. 8 , biometric authentication is performed after fingerprint authentication, but it is of course possible to perform biometric authentication first and then perform fingerprint authentication.

Although preferred embodiments of the present invention have been described above using specific terms, such terms are only for clearly describing the present invention, and the embodiments and described terms of the present invention depart from the spirit and scope of the following claims. It is self-evident that various changes and changes can be made without being performed. Such modified embodiments should not be individually understood from the spirit and scope of the present invention, but should be considered to fall within the scope of the claims of the present invention.

100: panel unit 101: first bioelectrode
103: second bioelectrode 105: fingerprint sensing electrode part
105a: first fingerprint sensing electrode 105b: second fingerprint sensing electrode
105c: third fingerprint sensing electrode
200: driving unit 300, 300a: biometric sensing unit
510a: bio-control unit 530a: bio-signal processing unit

Claims (5)

A first fingerprint sensing electrode unit having a rectangular shape in which a planar shape has a vertical side longer than a horizontal side;
a second fingerprint sensing electrode unit disposed at a distance spaced apart by a first distance from the longitudinal side of the first fingerprint sensing electrode unit, and having a rectangular shape with a planar shape having a vertical side longer than a horizontal side;
and a first biometric electrode and a second biometric electrode installed to be electrically spaced apart from each other in a space between the first fingerprint sensing electrode unit and the second fingerprint sensing electrode unit.
A first fingerprint sensing electrode unit having a rectangular shape in which a planar shape has a vertical side longer than a horizontal side;
a second fingerprint sensing electrode unit disposed at a distance spaced apart by a first distance from the longitudinal side of the first fingerprint sensing electrode unit, and having a rectangular shape with a planar shape having a vertical side longer than a horizontal side;
a third fingerprint sensing electrode unit disposed at a distance spaced apart by a second distance from the longitudinal side of the second fingerprint sensing electrode unit and having a rectangular shape with a planar shape having a vertical side longer than a horizontal side;
a first bioelectrode installed in a space between the first fingerprint sensing electrode unit and the second fingerprint sensing electrode unit; and
and a second biometric electrode installed in a space between the second fingerprint sensing electrode unit and the third fingerprint sensing electrode unit.
3. The method of claim 1 or 2,
The panel unit for biometric authentication, characterized in that the height of the first biological electrode or the second biological electrode is formed to be lower than the height of the first fingerprint sensing electrode part or the second fingerprint sensing electrode part.
The panel unit of claim 1 or 2,
a driving unit for applying a square wave having a single period to the first bioelectrode;
In a state in which the voltage measured by the first biological electrode is stabilized, a maximum measured voltage that is the highest value of the voltage detected by the first electrode and a lowest measured voltage that is the lowest value of the detected voltage are detected, and the detected voltage is the measured voltage A sensing unit for outputting an arrival time, which is the time required to reach a specific range of the measured voltage width obtained by the difference between the measured voltage maximum value and the measured voltage minimum value from the minimum value; and
and a signal processing unit for determining whether a body is a living body using the measured voltage width and the arrival time input from the sensing unit.
5. The method of claim 4,
The biometric authentication device according to claim 1, wherein one end is connected to the driving unit and the other end further comprises an additional resistor (Re) connected to the first bioelectrode.

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