Fingerprint anti-fake detection control circuit and device

Abstract

The utility model relates to a fingerprint anti-fake detection control circuit and device. The fingerprint anti-fake detection control circuit comprises a fingerprint sampling module, a living fingerprint identification module and a fingerprint lock control module. The fingerprint sampling module comprises a metal ring and a sampling unit, and the metal ring is provided with a positive electrode contact and a negative electrode contact; the metal ring is electrically connected with the sampling unit; the living body fingerprint identification module comprises a voltage detection unit and a living body fingerprint identification unit, the voltage detection unit is electrically connected with the sampling unit, and the sampling unit is electrically connected with the living body fingerprint identification unit; and the living body fingerprint identification unit is electrically connected with the fingerprint lock control module. The device can effectively prevent fingerprints from being counterfeited, improves the accuracy of living fingerprint identification, and is low in cost and high in reliability.

Description

Technical Field

[0001] The present application relates to the field of fingerprint recognition, and in particular to a fingerprint anti-counterfeiting detection control circuit and device. Background Art

[0002] With the development of society and advancements in technology, biometric recognition technology has gained widespread application in security authentication. Fingerprint recognition, as a mature biometric technology, is widely used in access control systems, security authentication, personal information protection, and other fields due to its uniqueness, irreproducibility, and convenience. However, traditional fingerprint recognition systems have certain security risks, especially their weak defense against forged fingerprints, making them vulnerable to counterfeit fingerprint attacks.

[0003] Most existing fingerprint recognition systems rely solely on matching fingerprint images, ignoring the question of whether the fingerprint is from a live individual. This allows some criminals to easily deceive fingerprint recognition systems by creating fake fingerprint molds, posing a security risk. Therefore, how to effectively distinguish between live and fake fingerprints and improve the security and reliability of fingerprint recognition systems has become a pressing issue in the field of fingerprint recognition technology. Utility Model Content

[0004] The purpose of this application is to provide a fingerprint anti-fake detection control circuit and device to solve the problem that the existing fingerprint detection cannot distinguish between live fingerprints and fake fingerprints, resulting in low security and reliability of the fingerprint recognition system.

[0005] In order to solve the above problems, this application adopts the following technical solutions:

[0006] A first aspect of the present application provides a fingerprint anti-counterfeiting detection control circuit, the fingerprint anti-counterfeiting detection control circuit comprising a fingerprint module and a lock control circuit; the fingerprint module comprising a fingerprint sampling module and a live fingerprint recognition module;

[0007] The fingerprint sampling module includes a fingerprint contact unit and a sampling unit; the fingerprint contact unit is electrically connected to the sampling unit; wherein the fingerprint contact unit is used to contact the fingerprint component to form a closed loop circuit;

[0008] The live fingerprint recognition module includes a voltage detection unit and a live fingerprint recognition unit, the voltage detection unit is electrically connected to the sampling unit, and the sampling unit is electrically connected to the live fingerprint recognition unit;

[0009] The live fingerprint recognition unit is electrically connected to the lock control circuit.

[0010] A second aspect of the present application provides a fingerprint anti-counterfeiting detection control circuit, the fingerprint anti-counterfeiting detection control circuit comprising a fingerprint module and a lock control circuit; the fingerprint module comprising a fingerprint sampling module and a live fingerprint recognition module;

[0011] The fingerprint sampling module includes a fingerprint contact unit and a sampling unit; the fingerprint contact unit is electrically connected to the sampling unit;

[0012] The lock control circuit includes a lock control module and a switch module; the lock control module includes a voltage detection unit and a lock control unit; the voltage detection unit is electrically connected to the sampling unit, the lock control unit is electrically connected to the voltage detection unit, the switch module is electrically connected to the lock control unit, and the live fingerprint recognition module is electrically connected to the switch module.

[0013] Preferably, the fingerprint contact unit is configured as a metal ring; the metal ring is provided with a positive contact and a negative contact and comprises two or more metal ring segments; the metal ring is electrically connected to the sampling unit.

[0014] Preferably, the fingerprint module further includes a voltage comparison module; the lock control circuit includes a lock control module and a switch module;

[0015] The sampling unit is electrically connected to the voltage comparison module and the voltage detection unit respectively, the lock control module is electrically connected to the voltage comparison module, the switch module is electrically connected to the lock control module, and the live fingerprint recognition unit is electrically connected to the switch module.

[0016] Preferably, the voltage detection unit is configured as an analog-to-digital converter independent of the live fingerprint recognition unit;

[0017] The analog-to-digital converter is electrically connected to the sampling unit and the living fingerprint recognition unit respectively.

[0018] Preferably, the voltage detection unit is configured as an analog-to-digital conversion circuit built into the live fingerprint recognition unit.

[0019] Preferably, the sampling unit includes a sampling resistor;

[0020] A first end of the sampling resistor is electrically connected to the metal ring and the voltage detection unit respectively, and a second end of the sampling resistor is grounded.

[0021] Preferably, the voltage comparison module includes a voltage comparison unit, a reference unit and a voltage output unit;

[0022] The reference unit is electrically connected to the voltage comparison unit, the voltage comparison unit is electrically connected to the sampling unit and the voltage output unit respectively, and the voltage output unit is electrically connected to the lock control module.

[0023] Preferably, the fingerprint anti-counterfeiting detection control circuit further includes a connection interface module;

[0024] The connection interface module is electrically connected to the voltage output unit and the lock control module respectively.

[0025] A third aspect of the present application provides a detection device for fingerprint anti-counterfeiting, including a shell having a receiving cavity formed therein, and the fingerprint anti-counterfeiting detection control circuit, which are arranged in the shell.

[0026] Compared with the existing technology, the present invention has the following advantages: when a user places a fingerprint component on the fingerprint contact unit, a voltage change is generated. The sampling unit is used to collect the voltage signal and output it to the voltage detection unit, which is used to detect the voltage signal. The live fingerprint recognition unit is used to determine whether the corresponding fingerprint is a live fingerprint. If the fingerprint is recognized as a live fingerprint, the live fingerprint recognition unit notifies the lock control circuit to unlock; if the fingerprint is not a live fingerprint, the lock control circuit remains locked. Therefore, the present invention can effectively prevent fingerprint forgery and improve the accuracy of live fingerprint recognition. It is low-cost and highly reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the principle of a fingerprint anti-counterfeiting detection control circuit provided in an embodiment of the present application;

[0028] Figure 2 A schematic diagram of another fingerprint anti-counterfeiting detection control circuit provided in an embodiment of the present application;

[0029] Figure 3 A schematic diagram illustrating an implementation principle of a voltage detection unit provided in an embodiment of the present application;

[0030] Figure 4 A schematic diagram illustrating another implementation principle of a voltage detection unit provided in an embodiment of the present application;

[0031] Figure 5 A schematic diagram illustrating the implementation of a fingerprint sampling module according to an embodiment of the present application;

[0032] Figure 6 A schematic diagram illustrating the connection between a fingerprint sampling module and a voltage comparison module provided in an embodiment of the present application;

[0033] Figure 7 This is the first embodiment provided in the embodiments of this application.

[0034] Figure 8This is the second embodiment provided in the embodiments of this application.

[0035] Figure 9 This is the third embodiment provided in the embodiments of the present application.

[0036] Figure 10 This is the fourth embodiment provided in the present application. DETAILED DESCRIPTION

[0037] The specific implementation methods of this application are described in detail below with reference to the accompanying drawings.

[0038] It should be noted that, unless there is a conflict, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of this application and should not be regarded as an improper restriction on this application.

[0039] It should be understood that the orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings. These orientation terms are only used to facilitate the description of this application and simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting this application.

[0040] See also Figure 1 , Figure 1 This is a schematic diagram of the principle of a fingerprint anti-counterfeiting detection control circuit provided in an embodiment of the present application. This embodiment of the present application provides a fingerprint anti-counterfeiting detection control circuit, which includes a fingerprint module 1 and a lock control circuit 2; the fingerprint module 1 includes a fingerprint sampling module 11 and a live fingerprint recognition module 12;

[0041] The fingerprint sampling module 11 includes a fingerprint contact unit 111 and a sampling unit 112; the fingerprint contact unit 111 is electrically connected to the sampling unit 112; wherein the fingerprint contact unit is used to contact the fingerprint component to form a closed loop circuit;

[0042] The live fingerprint recognition module 12 includes a voltage detection unit 121 and a live fingerprint recognition unit 122. The voltage detection unit 121 is electrically connected to the sampling unit 112, and the sampling unit 112 is electrically connected to the live fingerprint recognition unit 122.

[0043] The live fingerprint recognition unit 122 is electrically connected to the lock control circuit 2 .

[0044] In existing technologies, most fingerprint recognition systems rely solely on matching fingerprint images, ignoring whether the fingerprints are from living individuals. This allows some criminals to easily deceive fingerprint recognition systems by creating fake fingerprint molds, posing a security risk.

[0045] In view of the above shortcomings, the present application realizes accurate detection and differentiation of live fingerprints and fake fingerprints through the cooperation of the fingerprint module 1 and the lock control circuit 2, which can effectively prevent fingerprint forgery.

[0046] Specifically, in this embodiment, the fingerprint module 1 includes a fingerprint sampling module 11 and a live fingerprint recognition module 12. The fingerprint module 1 has a touch function. When a fingerprint component is placed on the fingerprint contact unit 111, the fingerprint component and the fingerprint contact unit 111 come into contact, forming a closed circuit. This closed circuit causes a change in the voltage signal. The structure of the fingerprint contact unit 111 is not specifically limited herein.

[0047] Specifically, in this embodiment, the fingerprint contact unit 111 generates a voltage change after contacting the fingerprint component, and the sampling unit 112 is used to collect the voltage signal and output it to the voltage detection unit 121, and the voltage detection unit 121 is used to detect the voltage signal; the live fingerprint recognition unit 122 is used to determine whether the corresponding fingerprint is a live fingerprint; if it is recognized as a live fingerprint, the live fingerprint recognition unit 122 notifies the lock control circuit to unlock; if it is not a live fingerprint, the lock control circuit remains locked.

[0048] Specifically, in this embodiment, if the fingerprint in contact with the fingerprint contact unit 111 is a live fingerprint, the voltage value of the voltage signal detected by the voltage detection unit 121 is within a first preset range; if the fingerprint in contact with the fingerprint contact unit 111 is a fake fingerprint, the voltage value of the voltage signal detected by the voltage detection unit 121 is within a second preset range.

[0049] Specifically, the live fingerprint recognition unit 122 determines whether the voltage value of the voltage signal is within the first preset range or the second preset range, thereby determining whether the fingerprint component contact is a live fingerprint or a fake fingerprint.

[0050] Specifically, the live fingerprint recognition module 12 and the lock control circuit 2 are implemented using an MCU (Microcontroller Unit; MCU, also known as a single-chip microcomputer or single-chip microcomputer, is a chip-level computer that integrates memory, counters, USB, A / D conversion, UART, PLC, DMA and other peripheral interfaces, and even LCD driver circuits on a single chip with appropriately reduced frequency and specifications of the central processing unit (CPU), forming a chip-level computer. Alternatively, they can be implemented using a PLC or FPGA. The models of the live fingerprint recognition module 12 and the lock control circuit 2 are not specifically limited.

[0051] Specifically, the fingerprint module of the present application is an integrated setting with strong compatibility. The fingerprint module of the present application can be applied to fingerprint collection devices such as active fingerprint sensors or passive fingerprint sensors, and is not specifically limited here.

[0052] In summary, the present application provides a fingerprint anti-counterfeiting detection control circuit. In this solution, the fingerprint anti-counterfeiting detection control circuit includes a fingerprint sampling module, a live fingerprint recognition module, and a fingerprint lock control module. The fingerprint sampling module includes a metal ring and a sampling unit, the metal ring having a positive contact and a negative contact; the metal ring is electrically connected to the sampling unit; the live fingerprint recognition module includes a voltage detection unit and a live fingerprint recognition unit, the voltage detection unit is electrically connected to the sampling unit, and the sampling unit is electrically connected to the live fingerprint recognition unit; the live fingerprint recognition unit is electrically connected to the fingerprint lock control module. Therefore, the present invention can effectively prevent fingerprint counterfeiting and improve the accuracy of live fingerprint recognition, with low cost and high reliability.

[0053] Based on the above embodiment:

[0054] As a preferred embodiment, the fingerprint contact unit 111 is configured as a metal ring; the metal ring is provided with a positive contact and a negative contact and includes two or more metal ring segments; the metal ring is electrically connected to the sampling unit.

[0055] Specifically, in one embodiment, the fingerprint contact unit 111 is configured as a metal ring, the metal ring is provided with a positive contact and a negative contact, and the metal ring includes two metal ring segments.

[0056] Specifically, when a fingerprint component such as a live fingerprint or a fake fingerprint contacts the positive and negative poles of the metal ring, a capacitor is formed between the fingerprint component and the metal ring. The size of the capacitor depends on the contact area between the fingerprint component and the metal ring, the distance between the two, and the dielectric constant of the medium. Since there is a dielectric (usually air) between the fingerprint component and the metal ring, when a closed circuit is formed, the charge will be redistributed between the metal ring, the fingerprint component and the contact medium, and the charge will flow between the positive and negative poles of the metal ring to form an electric field. Therefore, the redistribution of charge will cause a voltage difference to be generated between the positive and negative poles of the metal ring, thereby causing a change in the voltage signal when the fingerprint component is placed on the fingerprint contact unit 111. In this embodiment, the difference in dielectric constant between the live fingerprint or fake fingerprint and the metal ring leads to a difference in voltage difference. Therefore, the present application distinguishes between true and false fingerprints by voltage difference recognition, which can effectively prevent fingerprint forgery and improve the accuracy of live fingerprint recognition.

[0057] It is worth noting that the metal ring can also be provided with 3, 4, 5, or 6 segments, etc., which is not specifically limited here. In addition, the metal ring of the present application is annular, and in another embodiment, it can also be provided with a square shape, an elliptical shape, or a special-shaped column, etc., which is not specifically limited here.

[0058] It can be understood that in the present application, the metal ring is divided into two metal segments, which effectively improves the accuracy of fingerprint recognition without changing the existing process, and the process is simple and the cost is low.

[0059] See also Figure 2 , Figure 2 A schematic diagram of the principle of a fingerprint anti-counterfeiting detection control circuit provided in an embodiment of the present application.

[0060] As a preferred embodiment, the fingerprint module 1 further includes a voltage comparison module 13; the lock control circuit 2 includes a lock control module 21 and a switch module 22;

[0061] The sampling unit 112 is electrically connected to the voltage comparison module 13 and the voltage detection unit 121 respectively. The lock control module 21 is electrically connected to the voltage comparison module 13 . The switch module 22 is electrically connected to the lock control module 21 . The live fingerprint recognition unit 122 is electrically connected to the switch module 22 .

[0062] Specifically, in this embodiment, the fingerprint module 1 includes a fingerprint sampling module 11 , a live fingerprint recognition module 12 , and a voltage comparison module 13 . The fingerprint module 1 does not have a touch function.

[0063] Specifically, in this embodiment, the fingerprint contact unit 111 generates a voltage change after contacting the fingerprint component. The sampling unit 112 is used to collect the voltage signal and output it to the voltage comparison module 13. The voltage comparison module 13 compares the sampled voltage signal with the reference voltage. If the sampled voltage signal is greater than the reference voltage signal, it outputs a high level to enable the lock control module 21 to control the switch module 22 to turn on, thereby waking up the live fingerprint recognition module 12. After the live fingerprint recognition module 12 is powered on, the voltage detection unit 121 is used to detect the voltage signal. The live fingerprint recognition unit 122 is used to determine whether the corresponding fingerprint is a live fingerprint.

[0064] See also Figure 3 , Figure 3 This is a schematic diagram of the implementation principle of a voltage detection unit provided in an embodiment of the present application.

[0065] As a preferred embodiment, the voltage detection unit 121 is configured as an analog-to-digital converter independent of the live fingerprint recognition unit 122;

[0066] The analog-to-digital converter is electrically connected to the sampling unit 112 and the live fingerprint recognition unit 122 respectively.

[0067] See also Figure 4 , Figure 4 This is a schematic diagram of another implementation principle of a voltage detection unit provided in an embodiment of the present application.

[0068] As a preferred embodiment, the voltage detection unit 121 is configured as an analog-to-digital conversion circuit built into the live fingerprint recognition unit 122 .

[0069] Specifically, in this embodiment, the voltage detection unit 121 is used to receive the voltage signal collected by the sampling unit to detect the voltage value of the voltage signal. It is understood that the voltage detection unit 121 in this application is implemented by an analog-to-digital conversion circuit. The analog-to-digital conversion circuit can be configured as an independent analog-to-digital conversion IC or an analog-to-digital conversion circuit or software built into the MCU. The model of the analog-to-digital conversion IC and the structure of the analog-to-digital conversion circuit are not specifically limited here.

[0070] A second aspect of the present application provides a fingerprint anti-counterfeiting detection control circuit, a fingerprint anti-counterfeiting detection control circuit comprising a fingerprint module 1 and a lock control circuit 2; the fingerprint module 1 comprises a fingerprint sampling module 11 and a live fingerprint recognition module 12;

[0071] The fingerprint sampling module 11 includes a metal ring 111 and a sampling unit 112. The metal ring 111 is provided with a positive contact and a negative contact and includes two or more metal ring 111 segments. The metal ring 111 is electrically connected to the sampling unit 112.

[0072] The lock control circuit 2 includes a lock control module and a switch module; the lock control module includes a voltage detection unit 121 and a lock control unit; the voltage detection unit 121 is electrically connected to the sampling unit 112, the lock control unit is electrically connected to the voltage detection unit 121, the switch module is electrically connected to the lock control unit, and the live fingerprint recognition module 12 is electrically connected to the switch module.

[0073] Specifically, the fingerprint anti-counterfeiting detection principle of this embodiment is the same as the fingerprint anti-counterfeiting detection principle of the fingerprint anti-counterfeiting detection control circuit provided in the first aspect, except that the voltage detection unit 121 is set in the lock control module instead of the live fingerprint recognition module 12. The fingerprint anti-counterfeiting detection principle of this embodiment will not be repeated.

[0074] See also Figure 5 , Figure 5 A circuit schematic diagram of a fingerprint sampling module provided in an embodiment of the present application.

[0075] As a preferred embodiment, the sampling unit 112 includes a sampling resistor R17;

[0076] A first end of the sampling resistor R17 is electrically connected to the metal ring 111 and the voltage detection unit 121 , respectively, and a second end of the sampling resistor R17 is grounded.

[0077] Specifically, in this embodiment, when a fingerprint component such as a live fingerprint or a fake fingerprint contacts the positive and negative electrodes of the metal ring, a voltage difference is caused. The sampling resistor R17 is connected in parallel with the metal ring. When a voltage change is caused between the fingerprint component and the metal ring, the voltage across the sampling resistor also changes accordingly. The sampling resistor transmits the collected voltage change value to the voltage detection unit 121 so that the live fingerprint recognition module 12 can perform fingerprint recognition.

[0078] See also Figure 6 , Figure 6 A circuit schematic diagram of the connection between a fingerprint sampling module and a voltage comparison module provided in an embodiment of the present application.

[0079] As a preferred embodiment, the voltage comparison module includes a voltage comparison unit, a reference unit and a voltage output unit;

[0080] The reference unit is electrically connected to the voltage comparison unit, the voltage comparison unit is electrically connected to the sampling unit 112 and the voltage output unit respectively, and the voltage output unit is electrically connected to the lock control module.

[0081] Specifically, the reference unit is used to provide a reference voltage, and the voltage comparison unit compares the sampled voltage signal with the reference voltage. If the sampled voltage signal is greater than the reference voltage signal, a high level is output to enable the lock control module 21 to control the switch module 22 to be turned on.

[0082] Specifically, in this embodiment, the model of the voltage comparator is not specifically limited.

[0083] As a preferred embodiment, the fingerprint anti-counterfeiting detection control circuit further includes a connection interface module;

[0084] The connection interface module is electrically connected to the voltage output unit and the lock control module respectively.

[0085] In another embodiment, the voltage output unit and the lock control module can be directly connected without providing a connection interface module.

[0086] A third aspect of the present application provides a detection device for fingerprint anti-counterfeiting, including a shell having a receiving cavity formed therein, and the fingerprint anti-counterfeiting detection control circuit, which are arranged in the shell.

[0087] Example 1

[0088] See also Figure 7 , Figure 7 This is an implementation of a fingerprint anti-counterfeiting detection control circuit of the present application.

[0089] Specifically, in this embodiment, when a live finger touches the two contacts M+M- of the metal ring at the same time, the voltage change value is collected by the sampling resistor connected to the metal ring and then transmitted to the ADC port of the fingerprint MCU. The ADC port of the fingerprint MCU detects the ADC level. If the ADC level is in the range of 0.18V-0.76V, the fingerprint MCU determines it as a live fingerprint and continues to perform the fingerprint recognition action; if the ADC level is not in the range of 0.18V-0.76V, the fingerprint MCU determines it as a fake fingerprint and stops performing the fingerprint recognition action.

[0090] Specifically, the live fingerprint voltage value range of 0.18V-0.76V in this application is the voltage range of the live finger in contact with the metal contact. This voltage range can be set according to the structure of the fingerprint contact unit and is not specifically limited here.

[0091] Specifically, in this embodiment, when a fake fingerprint contacts the two contacts M+M- of the metal ring at the same time, the voltage change value is collected by the sampling resistor connected to the metal ring and then transmitted to the ADC port of the fingerprint MCU. The ADC port of the fingerprint MCU detects the ADC level. If the ADC level is between 1.5V and 3V, the fingerprint MCU determines it as a fake fingerprint and stops executing the fingerprint recognition action.

[0092] Specifically, the voltage value range of 1.5V-3V in this application is the voltage range when the fake fingerprint made of silicone material contacts the metal contact. This voltage range can be set according to the material of the fake fingerprint and the structure of the fingerprint contact unit, and is not specifically limited here.

[0093] Example 2

[0094] See also Figure 8 , Figure 8 This is an implementation of a fingerprint anti-counterfeiting detection control circuit of the present application.

[0095] Specifically, in this embodiment, when a live finger simultaneously touches the two contacts M+M- of the metal ring, the voltage change value is collected by the sampling resistor connected to the metal ring and transmitted to the voltage comparator. If the voltage change value is greater than the reference level of voltage comparator B, voltage comparator B outputs a high level to wake up the lock MCU and power on the fingerprint MCU. The ADC port of the fingerprint MCU detects the ADC level. If the ADC level is in the range of 0.18V-0.76V, the fingerprint MCU determines that it is a live fingerprint and continues to perform fingerprint recognition. Otherwise, if the ADC level is not in the range of 0.18V-0.76V, the fingerprint MCU determines that it is a fake fingerprint and stops performing fingerprint recognition.

[0096] Specifically, the live fingerprint voltage value range of 0.18V-0.76V in this application is the voltage range of the live finger in contact with the metal contact. This voltage range can be set according to the structure of the fingerprint contact unit and is not specifically limited here.

[0097] Specifically, in this embodiment, when a fake fingerprint simultaneously contacts the two contacts M+ and M- of the metal ring, the voltage change value is collected by a sampling resistor connected to the metal ring and transmitted to the voltage comparator. If the voltage change value is greater than the reference level of voltage comparator B, voltage comparator B outputs a high level to wake up the lock MCU and power on the fingerprint MCU. The ADC port of the fingerprint MCU detects the ADC level. If the ADC level is in the range of 1.5V-3V, the fingerprint MCU determines that the fingerprint is fake and stops performing fingerprint recognition.

[0098] Specifically, the voltage value range of 1.5V-3V in this application is the voltage range when the fake fingerprint made of silicone material contacts the metal contact. This voltage range can be set according to the material of the fake fingerprint and the structure of the fingerprint contact unit, and is not specifically limited here.

[0099] Example 3

[0100] See also Figure 9 , Figure 9 This is an implementation of a fingerprint anti-counterfeiting detection control circuit of the present application.

[0101] Specifically, in this embodiment, when a live finger touches the two contacts M+M- of the metal ring at the same time, the voltage change value is collected by the sampling resistor connected to the metal ring and then transmitted to the analog-to-digital conversion IC. The analog-to-digital conversion IC detects the ADC level. If the ADC level is in the range of 0.18V-0.76V, the fingerprint MCU determines it as a live fingerprint and continues to perform the fingerprint recognition action. Otherwise, if the ADC level is not in the range of 0.18V-0.76V, the fingerprint MCU determines it as a fake fingerprint and stops performing the fingerprint recognition action.

[0102] Specifically, the live fingerprint voltage value range of 0.18V-0.76V in this application is the voltage range of the live finger in contact with the metal contact. This voltage range can be set according to the structure of the fingerprint contact unit and is not specifically limited here.

[0103] Specifically, in this embodiment, when a fake fingerprint contacts the two contacts M+M- of the metal ring at the same time, the voltage change value is collected by the sampling resistor connected to the metal ring and transmitted to the analog-to-digital conversion IC. The analog-to-digital conversion IC detects the ADC level. If the ADC level is in the range of 1.5V-3V, the fingerprint MCU determines it as a fake fingerprint, and the fingerprint MCU stops executing the fingerprint recognition action.

[0104] Specifically, the voltage value range of 1.5V-3V in this application is the voltage range when the fake fingerprint made of silicone material contacts the metal contact. This voltage range can be set according to the material of the fake fingerprint and the structure of the fingerprint contact unit, and is not specifically limited here.

[0105] Example 4

[0106] See also Figure 10 , Figure 10 This is an implementation of a fingerprint anti-counterfeiting detection control circuit of the present application.

[0107] Specifically, in this embodiment, the implementation is similar to that of Embodiment 1, except that the ADC of the fingerprint MCU is replaced with the ADC of the lock MCU. After the lock MCU determines whether the fingerprint is real or fake, if it is a real fingerprint, it will call the fingerprint module to perform subsequent work. Otherwise, the lock MCU will not call the fingerprint module, or directly provide interaction data and prompt a fake fingerprint warning.

[0108] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the above embodiments, or to replace some of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions claimed to be protected by the present application.

Claims

1. A fingerprint anti-counterfeiting detection control circuit, characterized in that: The fingerprint anti-counterfeiting detection control circuit includes a fingerprint module and a lock control circuit; the fingerprint module includes a fingerprint sampling module and a live fingerprint recognition module; The fingerprint sampling module includes a fingerprint contact unit and a sampling unit; the fingerprint contact unit is electrically connected to the sampling unit; wherein the fingerprint contact unit is used to contact the fingerprint component to form a closed loop circuit; The live fingerprint recognition module includes a voltage detection unit and a live fingerprint recognition unit, the voltage detection unit is electrically connected to the sampling unit, and the sampling unit is electrically connected to the live fingerprint recognition unit; The live fingerprint recognition unit is electrically connected to the lock control circuit.

2. A fingerprint anti-counterfeiting detection control circuit according to claim 1, characterized in that: The fingerprint contact unit is configured as a metal ring; the metal ring is provided with a positive contact and a negative contact and includes two or more metal ring segments; the metal ring is electrically connected to the sampling unit.

3. The fingerprint anti-counterfeiting detection control circuit according to claim 1, characterized in that: The fingerprint module also includes a voltage comparison module; the lock control circuit includes a lock control module and a switch module; The sampling unit is electrically connected to the voltage comparison module and the voltage detection unit respectively, the lock control module is electrically connected to the voltage comparison module, the switch module is electrically connected to the lock control module, and the live fingerprint recognition unit is electrically connected to the switch module.

4. The fingerprint anti-counterfeiting detection control circuit according to claim 1, characterized in that: The voltage detection unit is configured as an analog-to-digital converter independent of the live fingerprint recognition unit; The analog-to-digital converter is electrically connected to the sampling unit and the living fingerprint recognition unit respectively.

5. The fingerprint anti-counterfeiting detection control circuit according to claim 1, characterized in that: The voltage detection unit is configured as an analog-to-digital conversion circuit built into the live fingerprint recognition unit.

6. The fingerprint anti-counterfeiting detection control circuit according to claim 2, characterized in that: The sampling unit includes a sampling resistor; A first end of the sampling resistor is electrically connected to the metal ring and the voltage detection unit respectively, and a second end of the sampling resistor is grounded.

7. The fingerprint anti-counterfeiting detection control circuit according to claim 3, characterized in that: The voltage comparison module includes a voltage comparison unit, a reference unit and a voltage output unit; The reference unit is electrically connected to the voltage comparison unit, the voltage comparison unit is electrically connected to the sampling unit and the voltage output unit respectively, and the voltage output unit is electrically connected to the lock control module.

8. The fingerprint anti-counterfeiting detection control circuit according to claim 7, characterized in that: The fingerprint anti-counterfeiting detection control circuit further includes a connection interface module; The connection interface module is electrically connected to the voltage output unit and the lock control module respectively.

9. A fingerprint anti-counterfeiting detection control circuit, characterized in that: The fingerprint anti-counterfeiting detection control circuit includes a fingerprint module and a lock control circuit; the fingerprint module includes a fingerprint sampling module and a live fingerprint recognition module; The fingerprint sampling module includes a fingerprint contact unit and a sampling unit; the fingerprint contact unit is electrically connected to the sampling unit; The lock control circuit includes a lock control module and a switch module; the lock control module includes a voltage detection unit and a lock control unit; the voltage detection unit is electrically connected to the sampling unit, the lock control unit is electrically connected to the voltage detection unit, the switch module is electrically connected to the lock control unit, and the live fingerprint recognition module is electrically connected to the switch module.

10. A fingerprint anti-counterfeiting detection device, characterized in that: A housing with an accommodating cavity formed therein, and the fingerprint anti-counterfeiting detection control circuit according to any one of claims 1 to 9 are arranged in the housing.

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