WO2021093384A1 - Dispositif de reconnaissance d'empreintes digitales et procédé de reconnaissance d'empreintes digitales - Google Patents

Dispositif de reconnaissance d'empreintes digitales et procédé de reconnaissance d'empreintes digitales Download PDF

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Publication number
WO2021093384A1
WO2021093384A1 PCT/CN2020/107448 CN2020107448W WO2021093384A1 WO 2021093384 A1 WO2021093384 A1 WO 2021093384A1 CN 2020107448 W CN2020107448 W CN 2020107448W WO 2021093384 A1 WO2021093384 A1 WO 2021093384A1
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WIPO (PCT)
Prior art keywords
electrode layer
fingerprint identification
signal
control circuit
fingerprint
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PCT/CN2020/107448
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English (en)
Chinese (zh)
Inventor
王地宝
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神盾股份有限公司
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Publication of WO2021093384A1 publication Critical patent/WO2021093384A1/fr

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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

Definitions

  • the invention relates to an identification device, in particular to a fingerprint identification device and a fingerprint identification method thereof.
  • the current common fingerprint recognition devices can be divided into optical, capacitive, ultrasonic, etc., of which capacitive fingerprint recognition devices are the mainstream.
  • the capacitive fingerprint recognition device cannot effectively identify fingerprints. For example, when the user’s finger or fingerprint recognition panel has water droplets or the finger is very wet, it will affect the capacitive fingerprint recognition device to obtain a clear fingerprint image. It cannot perform fingerprint recognition.
  • the recognition results of ultrasonic fingerprint recognition devices are less susceptible to environmental temperature and humidity, but it has the disadvantage of lower resolution than capacitive fingerprint recognition devices.
  • the invention provides a fingerprint identification device and a fingerprint identification method, which can obtain the clearest fingerprint image for fingerprint identification according to the environmental conditions where the fingerprint identification device is located, thereby improving the use quality of the fingerprint identification device.
  • the fingerprint identification device of the present invention includes a sensing unit and a control circuit.
  • the sensing unit includes a first electrode layer and a second electrode layer.
  • the control circuit is coupled to the first electrode layer and the second electrode layer.
  • the control circuit provides an actuation voltage to the sensing unit during the emission period, so that the sensing unit emits an ultrasonic signal to the finger to generate a reflected ultrasonic signal.
  • the first electrode layer During the receiving period, the reflected ultrasonic signal is received and the ultrasonic sensing signal is generated correspondingly.
  • the first electrode layer responds to the capacitance change between the first electrode layer and the finger during the capacitance sensing period to generate the capacitance sensing signal, and the control circuit corresponds to the ultrasonic sensing signal.
  • One of the first fingerprint image of the acoustic wave sensing signal and the second fingerprint image corresponding to the capacitive sensing signal is selected for fingerprint identification processing.
  • the invention also provides a fingerprint identification method of the fingerprint identification device.
  • the fingerprint identification device includes a sensing unit, and the sensing unit includes a first electrode layer and a second electrode layer.
  • the fingerprint identification method of the fingerprint identification device includes the following steps. During the transmission period, an actuation voltage is provided to the sensing unit, so that the sensing unit transmits an ultrasonic signal to the finger to generate a reflected ultrasonic signal. During the receiving period, the ultrasonic sensing signal generated by the reflection of the ultrasonic signal from the first electrode layer is received. During the capacitance sensing period, a capacitance sensing signal generated by the first electrode layer in response to the capacitance change between the first electrode layer and the finger is received. One of the first fingerprint image corresponding to the ultrasonic sensing signal and the second fingerprint image corresponding to the capacitance sensing signal is selected for fingerprint identification processing.
  • the control circuit of the embodiment of the present invention can select one of the first fingerprint image corresponding to the ultrasonic sensing signal and the second fingerprint image corresponding to the capacitance sensing signal to perform fingerprint identification processing. Since the first fingerprint image obtained by using the ultrasonic sensing signal is relatively unaffected by the environment, for example, it will not be affected by the water droplets on the finger or fingerprint recognition panel, the fingerprint recognition device can still obtain a clear fingerprint image for fingerprint recognition. The fingerprint cannot be recognized normally due to changes in environmental conditions, and when the second fingerprint image corresponding to the capacitive sensing signal is not affected by the environment, the fingerprint recognition device obtains the second fingerprint image with better clarity for fingerprint recognition. In this way, the clearest fingerprint image is adopted for fingerprint identification in response to the environmental conditions of the fingerprint identification device, which can effectively improve the quality of use of the fingerprint identification device.
  • Fig. 1 is a schematic diagram of a fingerprint identification device according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of a fingerprint identification device according to another embodiment of the present invention.
  • Fig. 3 is a schematic diagram of a switch signal according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a fingerprint identification device according to another embodiment of the present invention.
  • Fig. 5 is a schematic diagram of a switch signal according to another embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a fingerprint identification device according to another embodiment of the present invention.
  • FIG. 7 is a flowchart of a fingerprint identification method of a fingerprint identification device according to an embodiment of the present invention.
  • FIG. 8 is a flowchart of a fingerprint identification method of a fingerprint identification device according to another embodiment of the present invention.
  • FIG. 1 is a schematic diagram of a fingerprint identification device according to an embodiment of the present invention.
  • the fingerprint identification device may include an electrode layer 104, a sensing unit SU1 composed of an electrode layer 106, and a control circuit 108.
  • the electrode layer 104 is disposed between the cover plate 102 and the electrode layer 106, and the control circuit 108 is coupled to the electrode layer 104 and the electrode layer. 106.
  • the cover plate 102 can be implemented by, for example, glass, but is not limited to this. In other embodiments, the cover plate 102 can also be implemented by a transparent hard material such as resin.
  • the cover 102 can provide a detection surface for the user to place a finger for fingerprint recognition operation.
  • the control circuit 108 can control the electrode layer 106 to emit ultrasonic signals and receive fingerprint sensing signals from the receiving electrode layer 104.
  • the control circuit 108 can provide an actuation voltage to the sensing unit SU1 during the transmitting period, so that the sensing unit SU1 transmits ultrasonic signals to the user's finger F1.
  • the control circuit 108 can provide an actuation voltage to the electrode layer 106 during the emission period, and the electrode layer 106 can vibrate together with the electrode layer 104 by the electrostatic attraction force between the electrode layer 104 so that the sensing unit SU1 emits an ultrasonic signal.
  • the ultrasonic signal is reflected by the finger F1 to generate a reflected ultrasonic signal.
  • the electrode layer 104 receives the reflected ultrasonic signal during the receiving period and vibrates, which in turn causes the capacitance value between the electrode layer 104 and the electrode layer 106 to change.
  • the electrode layer 104 can convert the reflected ultrasonic signal into an electrical signal in response to the change in the capacitance value between the electrode layer 104 and the electrode layer 106 to generate an ultrasonic sensing signal.
  • the electrode layer 104 can react to changes in the capacitance value between the electrode layer 104 and the finger F1 during the capacitance sensing period, thereby generating a capacitance sensing signal.
  • the control circuit 108 can obtain the corresponding first fingerprint image according to the ultrasonic sensing signal, and obtain the corresponding second fingerprint image according to the capacitance sensing signal, and select one of the first fingerprint image and the second fingerprint image to proceed. Fingerprint recognition processing.
  • the ultrasonic sensing signal is not easily affected by environmental conditions (such as temperature and humidity).
  • environmental conditions such as temperature and humidity.
  • the clarity of the first fingerprint image obtained by using the ultrasonic sensing signal will not be affected, so the control circuit 108 can use the first fingerprint image to perform fingerprint identification processing.
  • the fingerprint identification device is in a normal operating environment, for example, the fingerprint identification device is in a dry environment, and there is no influence between the user's finger F1 and the cover 102 during the fingerprint identification operation.
  • the control circuit 108 can use the second fingerprint image with better clarity to perform fingerprint identification processing.
  • control circuit 108 can perform fingerprint identification normally, and can flexibly select the most suitable sensing mechanism according to the wet state of the user's finger or the environmental state, which can improve the use of the fingerprint identification device Quality to obtain the best fingerprint image.
  • the sensing signal is received through the same electrode layer (electrode layer 104) during the receiving period of the ultrasonic sensing and the capacitance sensing period, that is, the fingerprint identification device is in the ultrasonic sensing mode and the capacitance sensing mode.
  • the shared electrode layer 104 generates a sensing signal, which can avoid an additional increase in the area and thickness of the sensing chip, and can facilitate the miniaturization of the fingerprint identification device.
  • control circuit 108 is not limited to use the first fingerprint image or the second fingerprint image for fingerprint recognition in a specific environment.
  • the control circuit 108 can be based on the acquired first fingerprint image or the second fingerprint image.
  • the resolution determines the fingerprint image used in the fingerprint identification process.
  • the first fingerprint image or the second fingerprint image can be selected for fingerprinting according to at least one of the signal-to-noise ratio and contrast of the first fingerprint image and the second fingerprint image.
  • Recognition processing can also be changed to provide an actuation voltage to the electrode layer 104 during the emission period.
  • the electrode layer 104 can drive the electrode layer 106 to vibrate together by the electrostatic attraction between the electrode layer 106 and make the electrode layer 106 vibrate together.
  • the measurement unit transmits an ultrasonic signal to the user's finger F1.
  • FIG. 2 is a schematic diagram of a fingerprint identification device according to another embodiment of the present invention.
  • the control circuit 108 may include a transmission control circuit 202, a reception control circuit 204, a capacitance sensing control circuit 206, a switching circuit 208, and a processing circuit 210.
  • the switching circuit 208 is coupled to the transmission control circuit 202 and the reception control circuit 204.
  • the electrode layer 104 and the electrode layer 106, the processing circuit 210 is coupled to the receiving control circuit 204 and the capacitance sensing control circuit 206.
  • the switching circuit 208 can couple the transmission control circuit 202, the reception control circuit 204, and the capacitance sensing control circuit 206 to the electrode layer 104 or the electrode layer 106 in different periods.
  • the switch signals S1 to S3 are used to control the coupling state of the transmission control circuit 202, the reception control circuit 204, the capacitance sensing control circuit 206 and the electrode layer 104 and the electrode layer 106, respectively.
  • the switch circuit 208 couples the emission control circuit 202 to the electrode layer 106 according to the switch signal S1, so that the emission control circuit 202 can provide an actuation voltage to the electrode layer 106 through the switch circuit 208 to transmit ultrasonic signals.
  • the switching circuit 208 couples the receiving control circuit 204 to the electrode layer 104 according to the switching signal S2, so that the receiving control circuit 204 can receive the ultrasonic sensing signal output by the electrode layer 104 through the switching circuit 208, and generate a corresponding The first fingerprint image.
  • the switching circuit 208 couples the capacitance sensing control circuit 206 to the electrode layer 104 according to the switch signal S3, so that the capacitance sensing control circuit 206 can receive the capacitance sensing output from the electrode layer 104 through the switching circuit 208 Signal and generate the corresponding second fingerprint image.
  • the processing circuit 210 receives the first fingerprint image and the second fingerprint image from the receiving control circuit 204 and the capacitance sensing control circuit 206, and selects one of the first fingerprint image and the second fingerprint image for fingerprint identification processing, for example, you can select Fingerprint images with better clarity are processed for fingerprint recognition.
  • FIG. 4 is a schematic diagram of a fingerprint identification device according to another embodiment of the present invention.
  • the sensing unit SU1 of the fingerprint identification device includes an electrode layer 402 to an electrode layer 404, wherein the electrode layer 404 is disposed between the cover plate 102 and the electrode layer 406, and the electrode layer 402 is disposed on the cover plate 102 and the electrode layer. Between 408, the electrode layers 402, 404, and 406 are coupled to the switching circuit 208.
  • the electrode layer 404 and the electrode layer 406 are used to transmit an ultrasonic signal to the finger F1 by vibrating in response to the actuation voltage during the transmission period to generate a reflected ultrasonic signal.
  • the electrode layer 402 receives the reflected ultrasonic signal during the receiving period, and converts the reflected ultrasonic signal into an electrical signal in response to the change in capacitance between the electrode layer 402 and the electrode layer 408 to generate an ultrasonic sensing signal. In addition, the electrode layer 402 also reacts to changes in the capacitance between the electrode layer 402 and the finger F1 during the capacitance sensing period to generate a capacitance sensing signal.
  • the switching circuit 208 couples the emission control circuit 202 to the electrode layer 406 according to the switching signal S1, so that the emission control circuit 202 can provide the actuation voltage to the electrode layer 406 through the switching circuit 208
  • the electrode layer 404 or 406 is used to emit ultrasonic signals, for example, an actuation voltage can be provided to the electrode layer 404, so that the electrode layer 404 drives the electrode layer 406 to vibrate through electrostatic attraction.
  • the switching circuit 208 couples the receiving control circuit 204 to the electrode layer 402 according to the switching signal S2, so that the receiving control circuit 204 can receive the ultrasonic sensing signal output by the electrode layer 402 through the switching circuit 208, and generate a corresponding The first fingerprint image.
  • the switching circuit 208 couples the capacitance sensing control circuit 206 to the electrode layer 402 according to the switch signal S3, so that the capacitance sensing control circuit 206 can receive the capacitance sensing output from the electrode layer 402 through the switching circuit 208 Signal and generate the corresponding second fingerprint image.
  • the processing circuit 210 receives the first fingerprint image and the second fingerprint image from the receiving control circuit 204 and the capacitance sensing control circuit 206, and selects one of the first fingerprint image and the second fingerprint image to perform fingerprint identification processing.
  • the transmitting period T1 partially overlaps the receiving period T2, so that the receiving control circuit 204 can receive the ultrasonic sensing signal with better signal quality (for example, the ultrasonic wave with high signal-to-noise ratio). Sensing signal), but not limited to this.
  • the transmitting period T1 and the receiving period T2 may not overlap with the receiving period T2 according to actual requirements.
  • Fig. 6 is a schematic diagram of a fingerprint identification device according to another embodiment of the present invention.
  • the implementation of the sensing unit SU1 of the embodiment of FIG. 2 may be as shown in FIG. 6, a cavity H1 is formed between the electrode layer 104 and the electrode layer 106 to form a capacitive micromachined ultrasonic transducer (Capacitive Micromachined Ultrasonic Transducer). Transducer, CMUT) structure.
  • the transmission control circuit 202 can provide an actuation voltage to the electrode layer 104 or 106 through the switching circuit 208, so that the electrode layer 104 or 106 vibrates to transmit an ultrasonic signal to the finger F1, thereby generating a reflected ultrasonic signal.
  • the electrode layer 104 and the electrode layer 106 can receive the reflected ultrasonic signal and generate vibration, which changes the capacitance value between the electrode layer 104 and the electrode layer 106.
  • the electrode layer 104 can reflect the difference between the electrode layer 104 and the electrode layer 106.
  • the change in the capacitance value converts the reflected ultrasonic signal into an electrical signal, and generates an ultrasonic sensing signal to the receiving control circuit 204.
  • the electrode layer 104 can reflect the change of the capacitance value between the electrode layer 104 and the finger F1 to provide a capacitance sensing signal to the capacitance sensing control circuit 206.
  • the processing circuit 210 can select one of the first fingerprint image provided by the receiving control circuit 204 and the second fingerprint image provided by the capacitance sensing control circuit 206 for fingerprint identification processing.
  • the sensing unit of this embodiment may also have a cavity, that is, the sensing unit of the embodiment of FIG. 4 may also The structure of the capacitive miniature ultrasonic transducer is implemented.
  • FIG. 7 is a flowchart of a fingerprint identification method of a fingerprint identification device according to an embodiment of the present invention.
  • the fingerprint identification device includes a sensing unit, and the sensing unit includes a first electrode layer and a second electrode layer. It can be seen from the above embodiments that the fingerprint identification method of the fingerprint identification device may at least include the following steps. First, during the emission period, an actuation voltage is provided to the sensing unit, and the sensing unit transmits an ultrasonic signal to the finger to generate a reflected ultrasonic signal (step S702), for example, an actuation voltage may be provided to the first electrode layer or the second electrode layer.
  • Two electrode layers, the first electrode layer and the second electrode layer can respond to actuation voltage vibration, so that the sensing unit emits the ultrasonic signal. Then, during the receiving period, the ultrasonic sensing signal generated by the reflection of the ultrasonic signal from the first electrode layer is received (step S704).
  • the first electrode layer and the second electrode layer may receive the reflected ultrasonic signal to generate vibration, so that the first electrode layer and the second electrode layer
  • the capacitance value between the first electrode layer changes, and the first electrode layer can reflect the change of the capacitance value between the first electrode layer and the second electrode layer to convert the reflected ultrasonic signal into an electrical signal to generate an ultrasonic sensing signal.
  • step S706 a capacitance sensing signal generated by the first electrode layer in response to the capacitance change between the first electrode layer and the finger is received.
  • step S708 one of the first fingerprint image corresponding to the ultrasonic sensing signal and the second fingerprint image corresponding to the capacitive sensing signal is selected for fingerprint identification processing (step S708), for example, according to the first fingerprint image and the second fingerprint image At least one of the signal-to-noise ratio and the contrast ratio, the fingerprint image with higher image clarity is selected from the first fingerprint image and the second fingerprint image for fingerprint identification processing.
  • FIG. 8 is a flowchart of a fingerprint identification method of a fingerprint identification device according to another embodiment of the present invention.
  • the sensing unit may include a first electrode layer to a fourth electrode layer, wherein there may be cavities between the second electrode layer and the third electrode layer, and between the first electrode layer and the fourth electrode layer.
  • the second electrode layer and the third electrode layer are used for transmitting ultrasonic signals to the finger by vibrating in response to the actuation voltage during the transmitting period, so as to generate reflected ultrasonic signals.
  • the first electrode layer is used to receive the reflected ultrasonic signal during the receiving period, and reflect the change in capacitance between the first electrode layer and the fourth electrode layer to convert the reflected ultrasonic signal into an electrical signal to generate an ultrasonic sensing signal, and During the capacitance sensing period, a capacitance sensing signal generated by the first electrode layer in response to the capacitance change between the first electrode layer and the finger is received.
  • the fingerprint identification method of the fingerprint identification device may include the following steps. First, provide an actuation voltage to the second electrode layer or the third electrode layer during the emission period, so that the second electrode layer and the third electrode react with the actuation voltage to emit an ultrasonic signal to the finger to generate a reflected ultrasonic signal (step S802) .
  • the ultrasonic sensing signal generated by the first electrode layer in response to the change in capacitance between the first electrode layer and the fourth electrode layer is received during the receiving period (step S804).
  • the transmitting period may partially overlap the receiving period. During the period, it is not limited by this.
  • a capacitance sensing signal generated by the first electrode layer in response to the capacitance change between the first electrode layer and the finger is received (step S806).
  • select one of the first fingerprint image corresponding to the ultrasonic sensing signal and the second fingerprint image corresponding to the capacitance sensing signal for fingerprint identification processing for example, a fingerprint image with higher image clarity can be selected Perform fingerprint recognition processing.
  • the control circuit of this embodiment can select one of the first fingerprint image corresponding to the ultrasonic sensing signal and the second fingerprint image corresponding to the capacitance sensing signal to perform fingerprint identification processing. Since the first fingerprint image obtained by the ultrasonic sensing signal is less affected by the environment, for example, it will not be affected by the water droplets on the finger or the fingerprint recognition panel, the fingerprint recognition device can still obtain the fingerprint image with better clarity for fingerprint recognition , Instead of being unable to identify the fingerprint normally due to changes in environmental conditions, and when the second fingerprint image corresponding to the capacitive sensing signal is not affected by the environment, the fingerprint identification device obtains the second fingerprint image with better clarity for fingerprint identification.
  • the clearest fingerprint image is adopted for fingerprint identification in response to the environmental conditions of the fingerprint identification device, which can effectively improve the quality of use of the fingerprint identification device.
  • the electrode layer in the ultrasonic sensing mode and the capacitance sensing mode to generate the sensing signal (ultrasonic sensing signal and capacitance sensing signal)
  • the additional area and thickness of the sensing chip can be avoided, and the Conducive to the miniaturization of fingerprint identification devices.

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  • Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Image Input (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Abstract

La présente invention concerne un dispositif de reconnaissance d'empreintes digitales et son procédé de reconnaissance d'empreintes digitales. Pendant la période de réception, la réception d'un signal de détection à ultrasons généré par une première couche d'électrode en réponse à la réflexion du signal à ultrasons. Pendant la période de détection de capacité, la réception d'un signal de détection de capacité fourni par la première couche d'électrode en réponse à la variation de valeur de capacité entre la première couche d'électrode et le doigt. L'une de la première image d'empreinte digitale correspondant au signal de détection à ultrasons et de la seconde image d'empreinte digitale correspondant au signal de détection de capacité est sélectionnée pour un traitement de reconnaissance d'empreinte digitale.
PCT/CN2020/107448 2019-11-12 2020-08-06 Dispositif de reconnaissance d'empreintes digitales et procédé de reconnaissance d'empreintes digitales WO2021093384A1 (fr)

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