Ultrasonic fingerprint collection module, ultrasonic fingerprint collection method and device

Abstract

This specification provides an ultrasonic fingerprint acquisition module, ultrasonic fingerprint acquisition method, and apparatus, applicable to the field of fingerprint recognition technology. A fingerprint acquisition area, including at least a lower electrode array and a piezoelectric layer, can be positioned above the chip circuit layer. Simultaneously, a touch sensing area is positioned outside the fingerprint acquisition area. Insulated upper electrode layers, an inner ring and an outer ring, are respectively positioned above the fingerprint acquisition area and the touch sensing area, serving as electrodes for the ultrasonic transducer array and the touch sensing area, respectively. A finger touch detection circuit is integrated within the chip circuit layer and connected to the outer ring electrode layer and the processing module. Based on this structure, the ultrasonic fingerprint acquisition module is well-suited for non-under-screen fingerprint acquisition scenarios such as side fingerprint acquisition and rear fingerprint acquisition. It does not rely on a screen touch control module and can achieve ultrasonic fingerprint data acquisition with low cost and low power consumption.

Description

Technical Field

[0001] This manual pertains to the field of fingerprint recognition technology, and particularly relates to ultrasonic fingerprint acquisition modules, ultrasonic fingerprint acquisition methods, and devices. Background Technology

[0002] Based on existing methods, when collecting fingerprint data using devices such as fingerprint sensors, it is mostly necessary to rely on and utilize the touch control module built into the screen to detect whether a finger is pressed on the fingerprint collection area. Only when the touch control module on the screen detects that a finger is pressed on the fingerprint collection area will it be activated and the corresponding fingerprint data will be collected.

[0003] On the one hand, the above method relies heavily on the screen's built-in touch control module, which cannot be well adapted to non-under-screen fingerprint collection scenarios such as side fingerprint collection (e.g., side fingerprint unlocking) and rear fingerprint collection, requiring additional costs to deploy a dedicated touch detection module. On the other hand, based on the above method, the fingerprint sensor will inevitably need to perform a lot of data interaction and data processing with external circuits, resulting in high overall power consumption and affecting overall processing efficiency.

[0004] There is currently no effective solution to the above problems. Summary of the Invention

[0005] This specification provides an ultrasonic fingerprint acquisition module, ultrasonic fingerprint acquisition method and device, which can be well adapted to non-under-screen fingerprint acquisition scenarios such as side fingerprint acquisition and rear fingerprint acquisition. It can achieve ultrasonic fingerprint data acquisition with low cost and low power consumption without relying on the touch control module built into the external screen of the device.

[0006] This specification provides an ultrasonic fingerprint acquisition module, which includes at least a chip circuit layer, and a fingerprint acquisition area is provided above the chip circuit layer; wherein, the fingerprint acquisition area includes at least: a lower electrode array and a piezoelectric layer; a touch sensing area is also provided on the outside of the fingerprint acquisition area; An inner upper electrode layer is disposed above the piezoelectric layer; an outer upper electrode layer is disposed above the touch sensing area; and the inner upper electrode layer and the outer upper electrode layer are insulated from each other. The chip circuit layer also integrates a finger touch detection circuit; the finger touch detection circuit is connected to the outer upper electrode layer and the processing module.

[0007] In one embodiment, the touch sensing area includes: a capacitive touch sensing layer; The touch sensing area is arranged around the outside of the fingerprint collection area; the touch sensing area and the fingerprint collection area are located in the same horizontal plane.

[0008] In one embodiment, the length of the outer upper electrode layer and the perimeter of the fingerprint acquisition area satisfy a preset numerical relationship.

[0009] In one embodiment, the chip circuit layer is further provided with a first contact pad; the first contact pad is electrically connected to the outer upper electrode layer and the input terminal of the finger touch detection circuit.

[0010] In one embodiment, the chip circuit layer is further provided with a PAD array; the PAD array is electrically connected to the output terminal of the finger touch detection circuit and the processing module.

[0011] In one embodiment, the chip circuit layer is further provided with a second contact pad; the second contact pad is electrically connected to the inner upper electrode layer and the ultrasonic transmitting end; The ultrasonic transmitter is also connected to the processing module.

[0012] In one embodiment, a protective layer is provided on the outer side of the outer upper electrode layer and the inner upper electrode layer.

[0013] This specification also provides an ultrasonic fingerprint acquisition method based on the ultrasonic fingerprint acquisition module, including: When the touch sensor area detects a finger touching the fingerprint collection area, it generates a matching target sensing signal using the touch sensor area; The target sensing signal is transmitted to the finger touch detection circuit using the outer upper electrode layer; The finger touch detection circuit uses the target sensing signal to determine whether a finger is touching the fingerprint collection area, and the proportion of the contact area between the finger and the fingerprint collection area is greater than a preset threshold. When it is determined that a finger is touching the fingerprint collection area, and the contact area between the finger and the fingerprint collection area is greater than a preset threshold, an enable signal is generated by the finger touch detection circuit and transmitted to the processing module. The processing module responds to the enable signal by generating a corresponding voltage in the upper electrode layer within the ring, triggering the fingerprint acquisition area to emit an ultrasonic signal and acquiring the corresponding first echo signal to generate ultrasonic fingerprint data.

[0014] In one embodiment, the method further includes: When the current sensing signal determines that a finger has left the fingerprint acquisition area, a delayed signal is generated using the finger touch detection circuit; and this delayed signal is transmitted to the processing module. The processing module responds to the delayed signal by causing the upper electrode layer inside the coil to continue generating a corresponding voltage during the delayed time period, thereby acquiring the corresponding second echo signal.

[0015] In one embodiment, the method further includes: The ultrasonic receiver and digital-to-analog converter in the ultrasonic fingerprint acquisition module are calibrated using the second echo signal. And / or, The ultrasonic fingerprint data generated based on the first echo signal is corrected according to the second echo signal.

[0016] In one embodiment, the method further includes: User authentication is performed using ultrasonic fingerprint data, and the authentication result is obtained; Based on the verification results, perform the corresponding unlocking operation.

[0017] This specification also provides an ultrasonic fingerprint acquisition device, including: The sensing module is used to generate a matching target sensing signal when the touch sensing area detects a finger touching the fingerprint collection area. The first transmission module is used to transmit the target sensing signal to the finger touch detection circuit using the outer upper electrode layer; The determination module is used to determine, based on the target sensing signal, whether a finger is touching the fingerprint collection area and whether the contact area between the finger and the fingerprint collection area is greater than a preset threshold, using the finger touch detection circuit. The second transmission module is used to generate an enable signal using a finger touch detection circuit when it is determined that a finger is touching the fingerprint collection area and the contact area between the finger and the fingerprint collection area is greater than a preset ratio threshold; and to transmit the enable signal to the processing module. The acquisition module is used to respond to the enable signal by the processing module, generate a corresponding voltage in the upper electrode layer of the ring, trigger the fingerprint acquisition area to emit an ultrasonic signal, and acquire the corresponding first echo signal to generate ultrasonic fingerprint data.

[0018] This specification also provides an electronic device, including a processor and a memory for storing processor-executable instructions, wherein the processor executes the instructions to implement the steps of the ultrasonic fingerprint acquisition method.

[0019] This specification also provides a computer-readable storage medium having computer instructions stored thereon, which, when executed by a processor, implement the steps of the ultrasonic fingerprint acquisition method.

[0020] This specification also provides a computer program product comprising a computer program that, when executed by a processor, implements the steps of the ultrasonic fingerprint acquisition method.

[0021] Based on the ultrasonic fingerprint acquisition module, ultrasonic fingerprint acquisition method, and device provided in this specification, before implementation, a fingerprint acquisition area, including at least a lower electrode array and a piezoelectric layer, can be set above the chip circuit layer. Simultaneously, a corresponding touch sensing area is set around the fingerprint acquisition area. Above the fingerprint acquisition area and above the touch sensing area, mutually insulated upper electrode layers (inner and outer) are respectively set, serving as electrodes for the ultrasonic transducer array in the fingerprint acquisition area and electrodes for the touch sensing area. Furthermore, a finger touch detection circuit is integrated within the chip circuit layer, and this finger touch detection circuit is connected to the outer upper electrode layer and the processing module, respectively. In practical implementation, based on the above-described ultrasonic fingerprint acquisition module, when the touch sensing area detects a finger touching the fingerprint acquisition area, it first generates a matching target sensing signal. Then, using the outer upper electrode layer, the target sensing signal is transmitted to the internal finger touch detection circuit. Based on the target sensing signal, when it is determined that a finger is touching the fingerprint acquisition area and the contact area between the finger and the fingerprint acquisition area is greater than a preset threshold, the finger touch detection circuit generates an enable signal and transmits it to the processing module. The processing module responds to the enable signal by generating a corresponding voltage in the inner upper electrode layer, triggering the fingerprint acquisition area to emit an ultrasonic signal and acquiring the corresponding first echo signal to generate ultrasonic fingerprint data. This allows for better adaptation to non-under-screen fingerprint acquisition scenarios such as side fingerprint acquisition and rear fingerprint acquisition, without relying on an external touch control module built into the screen, achieving efficient acquisition of ultrasonic fingerprint data at a lower cost and with lower power consumption. Attached Figure Description

[0022] To more clearly illustrate the embodiments of this specification, the accompanying drawings used in the embodiments will be briefly introduced below. The drawings described below are only some embodiments recorded in this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structural composition of an ultrasonic fingerprint acquisition module provided in one embodiment of this specification; Figure 2 This is a schematic diagram illustrating one embodiment of the ultrasonic fingerprint acquisition module provided in this specification, applied in a scenario example. Figure 3 This is a schematic diagram illustrating one embodiment of the ultrasonic fingerprint acquisition module provided in this specification, applied in a scenario example. Figure 4This is a schematic diagram illustrating one embodiment of the ultrasonic fingerprint acquisition module provided in this specification, applied in a scenario example. Figure 5 This is a schematic diagram illustrating one embodiment of the ultrasonic fingerprint acquisition module provided in this specification, applied in a scenario example. Figure 6 This is a flowchart illustrating an embodiment of the ultrasonic fingerprint acquisition method provided in this specification. Figure 7 This is a schematic diagram illustrating an embodiment of the ultrasonic fingerprint acquisition method provided in this specification, applied in a scenario example. Figure 8 This is a schematic diagram illustrating an embodiment of the ultrasonic fingerprint acquisition method provided in this specification, applied in a scenario example. Figure 9 This is a schematic diagram illustrating an embodiment of the ultrasonic fingerprint acquisition method provided in this specification, applied in a scenario example. Figure 10 This is a schematic diagram illustrating an embodiment of the ultrasonic fingerprint acquisition method provided in this specification, applied in a scenario example. Figure 11 This is a schematic diagram illustrating an embodiment of the ultrasonic fingerprint acquisition method provided in this specification, applied in a scenario example. Figure 12 This is a schematic diagram illustrating an embodiment of the ultrasonic fingerprint acquisition method provided in this specification, applied in a scenario example. Figure 13 This is a schematic diagram of the structural composition of an electronic device provided in one embodiment of this specification; Figure 14 This is a schematic diagram of the structural composition of an ultrasonic fingerprint acquisition device provided in one embodiment of this specification; Figure 15 This is a schematic diagram illustrating one embodiment of the ultrasonic fingerprint acquisition module provided in this specification, applied in a scenario example. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this specification.

[0025] It should be noted that the information and data related to users involved in the embodiments of this specification are all information and data authorized by the user or fully authorized by the relevant parties. Furthermore, the collection, storage, use, processing, transmission, provision, disclosure, and application of the relevant data all comply with relevant laws, regulations, and standards, and necessary confidentiality measures have been taken. They do not violate public order and good morals, and corresponding operation entry points are provided for users or relevant parties to choose to authorize or refuse.

[0026] It should also be noted that in the embodiments of this specification, certain software, components, models and other existing solutions in the industry may be mentioned. These should be regarded as exemplary and are only intended to illustrate the feasibility of implementing the technical solution of this application. However, it does not mean that the applicant has used or necessarily used the solution.

[0027] See Figure 1 As shown in the figure, this specification provides an ultrasonic fingerprint acquisition module (or ultrasonic fingerprint module). It may include at least a chip circuit layer, with a fingerprint acquisition area disposed above the chip circuit layer; wherein the fingerprint acquisition area includes at least a lower electrode array and a piezoelectric layer; a touch sensing area is also disposed outside the fingerprint acquisition area; An inner upper electrode layer is disposed above the piezoelectric layer; an outer upper electrode layer is disposed above the touch sensing area; and the inner upper electrode layer and the outer upper electrode layer are insulated from each other. The chip circuit layer also integrates a finger touch detection circuit; the finger touch detection circuit is connected to the outer upper electrode layer and the processing module.

[0028] The fingerprint acquisition area (e.g., Active Area, which can be abbreviated as AA) can be used to acquire corresponding fingerprint data by emitting ultrasonic signals.

[0029] Specifically, the fingerprint acquisition area can be located above the chip circuit layer.

[0030] The aforementioned fingerprint acquisition area may include at least a lower electrode array and a piezoelectric layer; wherein the lower electrode array is specifically disposed below the piezoelectric layer. Furthermore, an inner-circle upper electrode layer may be disposed above the aforementioned piezoelectric layer, wherein the inner-circle upper electrode layer may cover the piezoelectric layer.

[0031] Furthermore, the aforementioned upper electrode layer, piezoelectric layer, and lower electrode array within the circle can constitute an ultrasonic transducer (or ultrasonic transducer array) in the fingerprint acquisition area; wherein, the aforementioned upper electrode layer within the circle can serve as the electrode of the ultrasonic transducer. Correspondingly, the aforementioned fingerprint acquisition area can emit ultrasonic signals externally through the aforementioned ultrasonic transducer to acquire corresponding ultrasonic fingerprint data.

[0032] Specifically, the aforementioned touch sensing area can surround the aforementioned fingerprint collection area and be located on the outside of the fingerprint collection area.

[0033] Specifically, the aforementioned touch-sensing area can be on the same plane as the fingerprint collection area and is arranged around the fingerprint collection area along its outline. The minimum proximity distance between the outline of the touch-sensing area and the outline of the fingerprint collection area is greater than a first distance threshold and less than a second distance threshold. The first distance threshold is less than the second distance threshold, and both the first and second distance thresholds are relatively small distance values. For example, the first distance threshold can be 0.1 mm, and the second distance threshold can be 0.2 mm, etc. This allows the ultrasonic fingerprint collection module to have a more compact overall structure and a thinner overall thickness, making it effectively applicable to complex and diverse application scenarios.

[0034] The aforementioned touch sensing area may specifically include at least one of the following: capacitive touch sensing layer, resistive touch sensing layer, infrared touch sensing layer, piezoelectric touch sensing layer, etc.

[0035] Of course, it should be noted that the touch sensing areas listed above are only illustrative. In actual implementation, depending on the specific circumstances and processing requirements, the touch sensing areas may include other types of touch sensing structures. This specification does not limit this.

[0036] An outer upper electrode layer may also be disposed above the aforementioned touch sensing area; wherein, the aforementioned outer upper electrode layer can serve as an electrode for the touch sensing area. Specifically, the aforementioned inner upper electrode layer and outer upper electrode layer can be two independent and insulated upper electrode layers.

[0037] Specifically, the aforementioned finger touch detection circuit can be integrated into the chip circuit layer.

[0038] The aforementioned finger touch detection circuit can be connected to the outer upper electrode layer and the processing module, respectively. Based on the sensing signal transmitted from the outer upper electrode layer and obtained from the touch sensing area, the finger touch detection circuit can automatically determine locally whether a finger is touching the fingerprint collection area; and when it is determined that a finger is touching the fingerprint collection area, it further calculates the percentage of the contact area between the finger and the fingerprint collection area, and detects whether this percentage is greater than a preset threshold (e.g., 60%).

[0039] The aforementioned finger touch detection circuit can also be connected to the outer upper electrode layer and the processing module, respectively.

[0040] The aforementioned processing module may specifically include processing circuitry within the chip, or a processor outside the chip.

[0041] The ultrasonic fingerprint acquisition module based on the above structure does not rely on external signals (e.g., the touch control module built into the screen) for activation, has a high degree of integration, can automatically wake up the fingerprint acquisition area to acquire ultrasonic fingerprint data, and has good adaptability, making it widely adaptable to diverse environmental scenarios.

[0042] Specifically, the aforementioned processing module can be connected to the ultrasonic transmitter (e.g., the TX module, Transmitter) in the ultrasonic fingerprint acquisition module, and the ultrasonic transmitter can also be connected to the upper electrode layer inside the ring. The ultrasonic transmitter is used to transmit ultrasonic signals externally.

[0043] In the implementation of the ultrasonic fingerprint acquisition module based on the above structure, the fingerprint acquisition area is in a dormant state by default to save energy.

[0044] When the touch sensing area detects a finger touching the fingerprint collection area, it can automatically collect the corresponding target sensing signal; and transmit the target sensing signal to the finger touch detection circuit through the outer upper electrode layer.

[0045] The aforementioned finger touch detection circuit can first determine whether a finger is touching the fingerprint collection area based on the target sensing signal; when it is determined that a finger is touching the fingerprint collection area, it can further calculate the contact area ratio between the finger and the fingerprint collection area based on the target sensing signal; and detect whether the contact area ratio between the finger and the fingerprint collection area is greater than a preset ratio threshold (e.g., 60%).

[0046] When a finger is detected touching the fingerprint acquisition area, and the contact area between the finger and the fingerprint acquisition area exceeds a preset threshold, the fingerprint touch detection circuit generates a corresponding enable signal and sends this enable signal to the processing module. Accordingly, the processing module responds to the enable signal by generating a voltage in the upper electrode layer within the ring. This voltage, combined with the upper electrode layer, piezoelectric layer, and lower electrode array, forms an ultrasonic transducer that emits ultrasonic signals to acquire corresponding ultrasonic fingerprint data.

[0047] The ultrasonic fingerprint acquisition module based on the above structure introduces and utilizes an inner upper electrode layer and an outer upper electrode layer that are arranged above the fingerprint acquisition area and the touch sensing area and are mutually isolated and insulated, as well as a finger touch detection circuit built into the chip circuit layer. It can be well adapted to non-under-screen fingerprint acquisition scenarios such as side fingerprint acquisition and rear fingerprint acquisition without relying on the touch control module of the screen, and achieves ultrasonic fingerprint data acquisition with low cost and low power consumption.

[0048] In some embodiments, the touch sensing area may specifically include: a capacitive touch sensing layer; The touch-sensing area is arranged around the outside of the fingerprint acquisition area; the touch-sensing area and the fingerprint acquisition area are located on the same horizontal plane. The touch-sensing area and the outer upper electrode layer are matched with the fingerprint acquisition area.

[0049] It should be noted that, compared to conventional ultrasonic fingerprint acquisition modules, the ultrasonic fingerprint acquisition module provided in this manual has the touch sensing area and the fingerprint acquisition area set on the same horizontal plane. On the one hand, the touch sensing area can be used to ground sense and detect the contact between the finger and the fingerprint acquisition area; on the other hand, since the touch sensing area and the fingerprint acquisition area are not arranged perpendicularly to each other, the overall thickness of the ultrasonic fingerprint acquisition device can be effectively reduced, making the ultrasonic fingerprint acquisition device relatively thinner and lighter, thus providing users with a relatively better user experience.

[0050] In some embodiments, the length of the outer upper electrode layer and the perimeter of the fingerprint acquisition area satisfy a preset numerical relationship.

[0051] Specifically, the difference between the length of the outer upper electrode layer and the perimeter of the fingerprint acquisition area is greater than or equal to 50% of the perimeter of the fingerprint acquisition area.

[0052] Based on the aforementioned length relationship, it can be ensured that the outer upper electrode layer can relatively completely and comprehensively surround and cover the area where the fingerprint collection area is located, so that the touch sensing area can accurately sense the contact of the finger with the fingerprint collection area.

[0053] In practice, for example, refer to Figure 2 As shown, the fingerprint collection area can be rectangular in shape on the plane. Accordingly, the outer rectangle of the fingerprint collection area can be determined first, and the midpoint of the short side of the outer rectangle closest to the PAD array can be determined; then, the starting point and ending point can be determined respectively, located on both sides of the midpoint along the short side of the outer rectangle, adjacent to the midpoint but not touching it; then, starting from the starting point, the corresponding touch sensing area and the outer upper electrode layer are arranged around the fingerprint collection area until the ending point, thereby obtaining the touch sensing area and the outer upper electrode layer that match the fingerprint collection area.

[0054] Specifically, the aforementioned PAD array can be understood as something originally deployed in the chip's circuit layer, used to connect the chip's internal circuitry and external circuitry through relevant interfaces (e.g., bumps).

[0055] In some embodiments, see Figure 1 and Figure 2 As shown, the chip circuit layer also has a first contact pad; the first contact pad is electrically connected to the outer upper electrode layer and the input terminal of the finger touch detection circuit. Wherein, Figure 1 It can be understood as Figure 2 The ultrasonic fingerprint device shown is cut along the center line of the first contact pad to obtain a cross-sectional view.

[0056] The aforementioned first contact pad can also be referred to as a capacitive touch-sensitive contact pad.

[0057] The aforementioned first contact pad can be specifically located on the side close to the PAD array in the ultrasonic fingerprint acquisition module. For example, see [link to relevant documentation]. Figure 2 As shown, the first contact pad can be located at the end point or near the end point. This allows full utilization of the existing circuit interface of the ultrasonic fingerprint acquisition module, facilitating the connection of new lines such as finger touch detection circuits, reducing modifications to the original circuit structure, and lowering wiring costs.

[0058] Specifically, the first contact pad can be electrically connected to the output of the finger touch detection circuit through metal traces in the chip circuit layer.

[0059] In some embodiments, the chip circuit layer may further include a PAD array; the PAD array is electrically connected to the output terminal of the finger touch detection circuit and the processing module.

[0060] Correspondingly, the signal output by the finger touch detection circuit, such as the enable signal, can be stably transmitted from the chip circuit layer to external structures such as processing modules through the PAD array.

[0061] Specifically, the aforementioned processing module can be a processor located outside the chip circuit layer. Specifically, the processing module can be the built-in processing circuit of the ultrasonic fingerprint acquisition module; or it can be a processor located outside the ultrasonic fingerprint acquisition module but connected to other electronic devices managed by the ultrasonic fingerprint acquisition module, such as the built-in processor of a tablet computer equipped with the aforementioned ultrasonic fingerprint acquisition module.

[0062] In some embodiments, the chip circuit layer may further be provided with a second contact pad; the second contact pad is electrically connected to the inner upper electrode layer and the ultrasonic transmitting end; The ultrasonic transmitter is also connected to the processing module.

[0063] The aforementioned second contact pad can also be referred to as the upper electrode contact pad.

[0064] The aforementioned second contact pad can be specifically located on the side close to the PAD array in the ultrasonic fingerprint acquisition module. For example, see [link to relevant documentation]. Figure 2 and Figure 3As shown, the second contact pad can be located on the side of the fingerprint acquisition area near the PAD array, and at a point connected to the upper electrode layer within the fingerprint acquisition area. This allows full utilization of the existing circuit interface of the ultrasonic fingerprint acquisition module, facilitating connections involving structures such as the ultrasonic transmitter and the upper electrode layer within the circle, reducing modifications to the original circuit structure, and lowering wiring costs. Figure 3 It can be understood as Figure 2 The ultrasonic fingerprint device shown is cut along the center line of the second contact pad to obtain a cross-sectional view.

[0065] Specifically, the upper electrode layer within the aforementioned circle may cover part or all of the second contact pad to be electrically connected to the second contact pad.

[0066] To ensure a stable electrical connection between the upper electrode layer within the ring and the second contact pad, the area of ​​the upper electrode layer within the ring covering the second base pad must be greater than a preset percentage threshold (e.g., 20%).

[0067] In some embodiments, a protective layer may be provided on the outer layer of the outer upper electrode layer and the outer layer of the inner upper electrode layer. This protective layer may be made of an electromagnetically resistant insulating material.

[0068] This effectively reduces the interference and influence of the external environment on the signals transmitted by the outer and inner upper electrode layers, enabling accurate triggering and acquisition of ultrasonic fingerprint data.

[0069] In some embodiments, see Figure 4 As shown, the ultrasonic fingerprint acquisition module may further include an ultrasonic receiver (e.g., an RX module, Receiver); wherein the ultrasonic receiver is used to receive the echo signal of the ultrasonic signal emitted by the ultrasonic transmitter.

[0070] In addition, the aforementioned ultrasonic fingerprint acquisition module may specifically include a digital-to-analog conversion module (e.g., an ADC module).

[0071] Specifically, the aforementioned ultrasonic receiver can be mounted on the chip circuit layer and connected to the digital-to-analog converter module. This digital-to-analog converter module can be connected to the processing module via a synchronous serial communication protocol interface or an integrated circuit bus communication interface (SPI / IIC).

[0072] Accordingly, in specific implementation, after the ultrasonic receiver receives the echo signal, it can first transmit the echo signal to the digital-to-analog converter module; the digital-to-analog converter module can convert the echo signal from the original analog signal into the corresponding digital signal; then the digital signal is transmitted to the processing module; the processing module can then generate the corresponding ultrasonic fingerprint data based on the above digital signal.

[0073] In some embodiments, see Figure 4 As shown, the aforementioned ultrasonic fingerprint acquisition module may further include a logic control module. Specifically, the logic control module may include the built-in processor of the ultrasonic fingerprint acquisition device.

[0074] The aforementioned logic control module can be connected to the finger touch detection circuit, ultrasonic transmitter, ultrasonic receiver, and digital-to-analog converter in the ultrasonic fingerprint acquisition module. Accordingly, the logic control module can control these components to perform the specific operations described above.

[0075] The ultrasonic fingerprint acquisition module based on the above structure does not require a built-in touch control module like existing conventional ultrasonic fingerprint acquisition modules, nor does it require a separate external touch control module. It can be easily connected and installed on electronic devices that need to collect fingerprint data at a lower cost. For example, see [reference needed]. Figure 5 As shown, this allows it to be well adapted to non-under-display fingerprint collection scenarios such as side fingerprint collection and rear fingerprint collection.

[0076] The electronic devices required to collect fingerprint data can include any of the following: tablets, mobile phones, smartwatches, smart glasses, etc. It should be noted that the electronic devices listed above are merely illustrative. In practice, depending on the specific circumstances and processing requirements, the ultrasonic fingerprint acquisition module can be applied to other suitable types of electronic devices. This specification does not limit its application in this regard.

[0077] In the implementation of the ultrasonic fingerprint acquisition module based on the above structure, under normal circumstances, the ultrasonic fingerprint acquisition area is in a dormant or standby state to save energy; while the touch sensing area is in a working state to detect in real time whether a finger touches or presses the ultrasonic fingerprint acquisition area.

[0078] When the touch sensing area detects a finger touching the fingerprint collection area, it can automatically collect the corresponding target sensing signal; and use the outer upper electrode layer to transmit the target sensing signal to the finger touch detection circuit through the first contact pad.

[0079] The finger touch detection circuit first determines whether a finger is touching the fingerprint collection area based on the target sensing signal. When it is determined that a finger is touching the fingerprint collection area, it calculates the contact area ratio between the finger and the fingerprint collection area based on the target sensing signal. Then, it determines whether the contact area ratio between the finger and the fingerprint collection area is greater than a preset ratio threshold by detecting whether the contact is valid or invalid (e.g., accidental contact).

[0080] When the contact area between the finger and the fingerprint acquisition area is determined to be greater than a preset threshold, the finger touch detection circuit can identify it as valid contact and generate a corresponding enable signal, which is then transmitted to the processing module. The processing module responds to the enable signal by generating a compliant ultrasonic excitation signal and sending it to the ultrasonic transmitter. The ultrasonic transmitter responds to the ultrasonic excitation signal, generating a voltage on the upper electrode layer within the ring through the second contact pad, automatically switching the fingerprint acquisition area from its dormant state to the active state.

[0081] When the fingerprint acquisition area is in operation, it can use the above-mentioned upper electrode layer, piezoelectric layer and lower electrode array in combination to emit ultrasonic signals to the outside through the ultrasonic transducer array in order to acquire corresponding ultrasonic fingerprint data.

[0082] Simultaneously, the finger touch detection circuit can continue to monitor the contact between the finger and the fingerprint collection area through the touch sensing area. When the touch sensing area detects that the finger has left the fingerprint collection area, the finger touch detection circuit can generate a corresponding end signal and transmit this end signal to the processing module. The processing module can respond to this end signal by stopping the transmission of ultrasonic excitation signals to the outer upper electrode layer, causing the fingerprint collection area to switch back to the sleep state.

[0083] Conversely, when the contact area between the finger and the fingerprint acquisition area is less than or equal to a preset threshold, the finger touch detection circuit can determine it as invalid contact. In this case, the finger touch detection circuit will not generate a corresponding enable signal, and the fingerprint acquisition area will remain in a dormant state.

[0084] In some embodiments, the finger touch detection circuit described above can also be connected to an audio-visual prompter. Specifically, when it is determined that a finger is touching the fingerprint acquisition area, and the contact area between the finger and the fingerprint acquisition area is less than or equal to a preset threshold, the finger touch detection circuit can generate a corresponding prompt signal and transmit this signal to the audio-visual prompter. The audio-visual prompter can respond to the prompt signal by emitting a prompt sound and / or flashing a light, promptly reminding the user to align the center of their finger with the center of the fingerprint acquisition area to successfully acquire the required ultrasonic fingerprint data.

[0085] As can be seen from the above, the ultrasonic fingerprint acquisition module provided in the embodiments of this specification, before specific implementation, can have a fingerprint acquisition area including at least a lower electrode array and a piezoelectric layer disposed above the chip circuit layer; at the same time, a corresponding touch sensing area is disposed around the fingerprint acquisition area on the outside of the fingerprint acquisition area; and an inner upper electrode layer and an outer upper electrode layer, which are mutually insulated and isolated, are disposed above the fingerprint acquisition area and above the touch sensing area, respectively, serving as the electrodes of the ultrasonic transducer array and the electrodes of the touch sensing area. Meanwhile, a finger touch detection circuit is also integrated within the chip circuit layer, and this finger touch detection circuit is connected to the outer upper electrode layer and the processing module respectively. In practical implementation, based on the above-described ultrasonic fingerprint acquisition module, when the touch sensing area detects a finger touching the fingerprint acquisition area, it first generates a matching target sensing signal. Then, using the outer upper electrode layer, the target sensing signal is transmitted to the internal finger touch detection circuit. Based on the target sensing signal, when it is determined that a finger is touching the fingerprint acquisition area and the contact area between the finger and the fingerprint acquisition area is greater than a preset threshold, the finger touch detection circuit generates an enable signal and transmits it to the processing module. The processing module responds to the enable signal by generating a corresponding voltage in the inner upper electrode layer, triggering the fingerprint acquisition area to emit an ultrasonic signal and acquiring the corresponding first echo signal to generate ultrasonic fingerprint data. This allows for better adaptation to non-under-screen fingerprint acquisition scenarios such as side fingerprint acquisition and rear fingerprint acquisition, eliminating the need for a screen-based touch control module and enabling accurate ultrasonic fingerprint data acquisition at a lower cost and with lower power consumption.

[0086] See Figure 6 As shown, based on the above-described ultrasonic fingerprint acquisition module, this specification also provides an ultrasonic fingerprint acquisition method using the ultrasonic fingerprint acquisition module. In specific implementation, this method may include the following: S601: When the touch sensing area detects a finger touching the fingerprint collection area, it generates a matching target sensing signal using the touch sensing area; S602: The target sensing signal is transmitted to the finger touch detection circuit using the outer upper electrode layer; S603: Using the finger touch detection circuit, determine whether a finger touches the fingerprint collection area based on the target sensing signal, and the proportion of the contact area between the finger and the fingerprint collection area is greater than a preset ratio threshold. S604: When it is determined that a finger is touching the fingerprint collection area and the contact area between the finger and the fingerprint collection area is greater than a preset ratio threshold, an enable signal is generated by the finger touch detection circuit and the enable signal is transmitted to the processing module. S605: The processing module responds to the enable signal by generating a corresponding voltage in the upper electrode layer within the ring, triggering the fingerprint acquisition area to emit an ultrasonic signal and acquiring the corresponding first echo signal to generate ultrasonic fingerprint data.

[0087] In practice, the touch sensing area can be set to the default working state, and the fingerprint collection area can be set to the default sleep state.

[0088] When the touch sensing area detects a finger touching the fingerprint collection area, it can generate a target sensing signal that matches the finger touching the fingerprint collection area. This target sensing signal is then transmitted to the finger touch detection circuit in the chip circuit layer via the outer electrode layer located above the touch sensing area.

[0089] Specifically, the target sensing signal can be transmitted to the finger touch detection circuit via the first contact pad through the outer electrode layer.

[0090] After the target sensing signal is transmitted to the finger touch detection circuit, the finger touch detection circuit can determine whether a finger is touching the fingerprint collection area based on the target sensing signal, and whether the contact area between the finger and the fingerprint collection area is greater than a preset ratio threshold.

[0091] Specifically, a finger touch detection circuit can be used to detect whether the target sensing signal is greater than a preset signal threshold. If it is greater than the preset signal threshold, it can be determined that a finger has touched the fingerprint collection area. Further, according to a preset mapping rule, the contact area ratio between the finger and the fingerprint collection area can be mapped based on the target sensing signal. It can then be detected whether this contact area ratio is greater than a preset ratio threshold. If it is determined that the contact area ratio between the finger and the fingerprint collection area is greater than the preset ratio threshold, it can be determined that the contact between the finger and the fingerprint collection area is valid. For example, see [reference needed]. Figure 7 and Figure 8 As shown in the diagram, it can then respond to the aforementioned finger touch operation, triggering the activation of the fingerprint acquisition area to collect ultrasonic fingerprint data.

[0092] Conversely, if the detected target sensing signal is less than or equal to a preset signal threshold, it can be determined that no finger is touching the fingerprint collection area, and no response is made. If the detected contact area between the finger and the fingerprint collection area is less than or equal to a preset proportion threshold, it can be determined that the contact between the finger and the fingerprint collection area is not considered valid contact. For example, see [reference needed]. Figure 9 , Figure 10 , Figure 11 As shown in the image, even if a finger is detected touching the fingerprint collection area, the system will not respond to the finger touch operation to avoid accidental triggering.

[0093] When it is determined that a finger is touching the fingerprint acquisition area, and the contact area between the finger and the fingerprint acquisition area is greater than a preset threshold, the fingerprint acquisition area is awakened in response to the finger touch operation. A corresponding enable signal can be generated by the finger touch detection circuit and transmitted to the processing module. The processing module then responds to the enable signal by generating a corresponding voltage in the upper electrode layer of the ring, thereby waking up the fingerprint acquisition area and automatically switching it from a dormant state to a working state. In the working state, the fingerprint acquisition area can emit ultrasonic signals and acquire the first echo signal corresponding to the ultrasonic signal to generate corresponding ultrasonic fingerprint data.

[0094] Specifically, a finger touch detection circuit can first generate an enable signal, which is then transmitted to the processing module. The processing module, based on a fixed clock signal, responds to this enable signal and generates a corresponding ultrasonic excitation signal. For details, please refer to [link to relevant documentation]. Figure 12 As shown, the ultrasonic excitation signal is sent to the ultrasonic transmitter. In response to the ultrasonic excitation signal, the ultrasonic transmitter generates a voltage on the upper electrode layer within the ring via the second contact pad, creating a voltage difference with the lower electrode array, thus waking up the fingerprint acquisition area and automatically switching it to the working state.

[0095] Based on the above embodiments, the ultrasonic fingerprint acquisition module with the above structure can be well adapted to non-under-screen fingerprint acquisition scenarios such as side fingerprint acquisition and rear fingerprint acquisition. It can acquire ultrasonic fingerprint data with low cost and low power consumption without relying on the touch control module of the screen.

[0096] In some embodiments, after determining, based on the target sensing signal, that a finger is touching the fingerprint acquisition area and the contact area between the finger and the fingerprint acquisition area accounts for a proportion greater than a preset threshold, the finger touch detection circuit can further determine the position coordinates of the contact position between the finger and the fingerprint acquisition area based on the target sensing signal; and based on these position coordinates, detect whether the offset distance between the contact position of the finger and the fingerprint acquisition area and the center position of the fingerprint acquisition area is less than a preset distance threshold. If the offset distance is less than the preset distance threshold, it can be determined that high-quality ultrasonic fingerprint data can be successfully acquired, and the fingerprint acquisition area can be automatically activated.

[0097] Conversely, if the offset distance is greater than or equal to a preset distance threshold, for example, see [link to relevant documentation] Figure 9 , Figure 10 , Figure 11As shown, even if the fingerprint sensor is activated and ultrasonic fingerprint data is collected, the collected ultrasonic fingerprint data is often incomplete and of poor quality. Therefore, it is possible to either not respond or actively prompt the user to align the center of their finger with the center of the fingerprint sensor to successfully collect the required ultrasonic fingerprint data.

[0098] In some embodiments, the method may further include the following: S1: When it is determined that a finger has left the fingerprint acquisition area based on the current sensing signal, a delayed signal is generated using the finger touch detection circuit; and the delayed signal is transmitted to the processing module. S2: The processing module responds to the delayed signal by causing the upper electrode layer inside the coil to continue generating a corresponding voltage during the delayed time period in order to acquire the corresponding second echo signal.

[0099] In practical implementation, when it is determined based on the current sensing signal that a finger has left the fingerprint acquisition area, the finger touch detection circuit can continue to generate a delayed signal within the delay period. Correspondingly, the processing module can respond to this delayed signal and continue to generate an ultrasonic excitation signal within the delay period, so that the upper electrode layer continues to generate a corresponding voltage during the delay period. The fingerprint acquisition area remains operational to acquire an echo signal that does not contain fingerprint information, which serves as the second echo signal. See details in [link to documentation]. Figure 12 As shown.

[0100] When the current sensing signal determines that a finger has left the fingerprint acquisition area, the finger touch detection circuit can generate and transmit an end signal to the processing module. External processing can, according to preset logic rules, continue to generate an ultrasonic excitation signal within a delay period upon receiving the end signal, so that the upper electrode layer continues to generate a corresponding voltage within the delay period to continue acquiring the second echo signal during the delay period.

[0101] The second echo signal contains fingerprint signals, but also contains environmental noise and / or circuit noise.

[0102] In some embodiments, the method may further include the following: The ultrasonic receiver and digital-to-analog converter in the ultrasonic fingerprint acquisition module are calibrated using the second echo signal. And / or, The ultrasonic fingerprint data generated based on the first echo signal is corrected according to the second echo signal.

[0103] In practice, the second echo signal can be used to extract and, based on the corresponding environmental noise and / or circuit noise, to specifically calibrate the ultrasonic receiver and digital-to-analog converter in the ultrasonic fingerprint acquisition module. This will enable the subsequent acquisition of ultrasonic fingerprint data based on the calibrated ultrasonic receiver and digital-to-analog converter, effectively eliminating the relevant environmental noise and / or circuit noise, and obtaining ultrasonic fingerprint data with high accuracy and small error.

[0104] In practice, the second echo signal can be used to denoise and correct the ultrasonic fingerprint data generated based on the first echo signal, so as to selectively remove environmental noise and / or circuit noise and obtain corrected ultrasonic fingerprint data with higher accuracy and smaller error.

[0105] In some embodiments, the method may further include the following: S1: Use ultrasonic fingerprint data to verify user identity and obtain the verification result; S2: Based on the verification result, perform the matching unlocking operation.

[0106] In practice, user authentication can be performed by querying and matching user fingerprint templates in the user database based on ultrasonic fingerprint data, and obtaining the corresponding authentication result. Based on the authentication result, when user authentication is confirmed to be successful, a finger touch operation can be initiated, sending an unlock command to the electronic device associated with the ultrasonic fingerprint acquisition module; the electronic device then responds to the unlock command and automatically executes the corresponding unlocking operation.

[0107] Conversely, based on the verification results, if it is determined that the user's authentication has failed, the system will refuse to respond to finger touch operations and can provide error messages to the user through the built-in audio-visual prompts.

[0108] As can be seen from the above, the ultrasonic fingerprint acquisition method provided in the embodiments of this specification can make full use of the relevant circuit structure in the ultrasonic fingerprint acquisition module, and is well adapted to non-under-screen fingerprint acquisition scenarios such as side fingerprint acquisition and rear fingerprint acquisition. It can acquire ultrasonic fingerprint data at a lower cost and with lower power consumption without relying on the touch control module of the screen.

[0109] This specification provides an electronic device through its embodiments. (See attached document.) Figure 13 As shown. The electronic device includes a network communication port 1301, a processor 1302, and a memory 1303. These structures are connected by internal cables so that they can perform specific data interaction.

[0110] Specifically, the network communication port 1301 can be used to receive startup commands.

[0111] The processor 1302 can specifically be used to respond to a startup command, control the fingerprint acquisition area to be in a sleep state, and simultaneously enable the touch sensing area to be in an active state; when the touch sensing area detects a finger touching the fingerprint acquisition area, it generates a matching target sensing signal; the target sensing signal is transmitted to the finger touch detection circuit using the outer upper electrode layer; the finger touch detection circuit determines whether a finger is touching the fingerprint acquisition area based on the target sensing signal, and the contact area ratio between the finger and the fingerprint acquisition area is greater than a preset ratio threshold; when it is determined that a finger is touching the fingerprint acquisition area, and the contact area ratio between the finger and the fingerprint acquisition area is greater than the preset ratio threshold, the finger touch detection circuit generates an enable signal; and transmits the enable signal to the processing module; the processing module responds to the enable signal by generating a corresponding voltage in the inner upper electrode layer, triggering the fingerprint acquisition area to emit an ultrasonic signal, and acquiring the corresponding first echo signal to generate ultrasonic fingerprint data.

[0112] The memory 1303 can be used to store the corresponding instruction program and related intermediate data.

[0113] Based on the above method, the relevant structural performance of electronic devices can be effectively utilized to improve the data processing speed of electronic devices and efficiently realize the data processing of ultrasonic fingerprint acquisition.

[0114] In this embodiment, the network communication port 1301 can be a virtual port bound to different communication protocols, thereby enabling the sending or receiving of different data. For example, the network communication port can be a port responsible for web data communication, a port responsible for FTP data communication, or a port responsible for email data communication. Furthermore, the network communication port can also be a physical communication interface or communication chip. For example, it can be a wireless mobile network communication chip, such as GSM or CDMA; it can also be a Wi-Fi chip; or it can be a Bluetooth chip.

[0115] In this embodiment, the processor 1302 can be implemented in any suitable manner. For example, the processor can take the form of a microprocessor or processor and a computer-readable medium storing computer-readable program code (e.g., software or firmware) executable by the (micro)processor, logic gates, switches, application-specific integrated circuits (ASICs), programmable logic controllers, and embedded microcontrollers, etc. This specification is not limiting.

[0116] In this embodiment, the memory 1303 may include multiple layers. In a digital system, anything that can store binary data can be a memory. In an integrated circuit, a circuit with storage function but no physical form is also called a memory, such as RAM, FIFO, etc. In a system, a storage device with a physical form is also called a memory, such as a memory stick, TF card, etc.

[0117] This specification also provides a computer-readable storage medium based on the above-described ultrasonic fingerprint acquisition method. The computer-readable storage medium stores computer program instructions that, when executed, implement the following: when a touch sensing area detects a finger touching the fingerprint acquisition area, a matching target sensing signal is generated using the touch sensing area; the target sensing signal is transmitted to a finger touch detection circuit using an outer upper electrode layer; the finger touch detection circuit determines, based on the target sensing signal, whether a finger is touching the fingerprint acquisition area, and whether the contact area between the finger and the fingerprint acquisition area is greater than a preset threshold ratio; when it is determined that a finger is touching the fingerprint acquisition area, and the contact area between the finger and the fingerprint acquisition area is greater than the preset threshold ratio, an enable signal is generated using the finger touch detection circuit; and the enable signal is transmitted to a processing module; the processing module responds to the enable signal by generating a corresponding voltage in the inner upper electrode layer, triggering the fingerprint acquisition area to emit an ultrasonic signal, and acquiring the corresponding first echo signal to generate ultrasonic fingerprint data.

[0118] In this embodiment, the storage medium includes, but is not limited to, Random Access Memory (RAM), Read-Only Memory (ROM), Cache, Hard Disk Drive (HDD), or Memory Card. The memory can be used to store computer program instructions. The network communication unit can be an interface configured according to standards specified in the communication protocol for network connection communication.

[0119] In this embodiment, the specific functions and effects implemented by the program instructions stored in the computer-readable storage medium can be explained in comparison with other embodiments, and will not be repeated here.

[0120] This specification also provides a computer program product, comprising at least a computer program, which, when executed by a processor, implements the following method steps: when a touch sensing area detects a finger touching the fingerprint collection area, a matching target sensing signal is generated using the touch sensing area; the target sensing signal is transmitted to a finger touch detection circuit using an outer upper electrode layer; the finger touch detection circuit determines, based on the target sensing signal, whether a finger is touching the fingerprint collection area, and the contact area ratio between the finger and the fingerprint collection area is greater than a preset ratio threshold; when it is determined that a finger is touching the fingerprint collection area, and the contact area ratio between the finger and the fingerprint collection area is greater than the preset ratio threshold, an enable signal is generated using the finger touch detection circuit; and the enable signal is transmitted to a processing module; the processing module responds to the enable signal by generating a corresponding voltage in the inner upper electrode layer, triggering the fingerprint collection area to emit an ultrasonic signal, and acquiring a corresponding first echo signal to generate ultrasonic fingerprint data.

[0121] See Figure 14 As shown in the embodiments of this specification, an ultrasonic fingerprint acquisition device is also provided, which may specifically include the following structural modules: The sensing module 1401 can be used to generate a matching target sensing signal when the touch sensing area senses that a finger is touching the fingerprint collection area. The first transmission module 1402 can be used to transmit the target sensing signal to the finger touch detection circuit using the outer upper electrode layer; The determination module 1403 can be specifically used to determine, based on the target sensing signal, whether a finger touches the fingerprint collection area and the proportion of the contact area between the finger and the fingerprint collection area is greater than a preset ratio threshold. The second transmission module 1404 is specifically used to generate an enable signal using a finger touch detection circuit when it is determined that a finger is touching the fingerprint collection area and the contact area between the finger and the fingerprint collection area is greater than a preset ratio threshold; and to transmit the enable signal to the processing module. The acquisition module 1405 can be used to respond to the enable signal by the processing module, generate a corresponding voltage in the upper electrode layer of the circle, trigger the fingerprint acquisition area to emit an ultrasonic signal, and acquire the corresponding first echo signal to generate ultrasonic fingerprint data.

[0122] In some embodiments, the above-described device can also be used to: when it is determined from the fingerprint collection area that a finger has left the fingerprint collection area based on the current sensing signal, generate a delayed signal using a finger touch detection circuit; transmit the delayed signal to a processing module; and use the processing module to respond to the delayed signal by causing the upper electrode layer inside the ring to continue generating a corresponding voltage during the delayed time period in order to collect the corresponding second echo signal.

[0123] In some embodiments, the above-described apparatus may also be used to: calibrate the ultrasonic receiver and digital-to-analog converter in the ultrasonic fingerprint acquisition module using the second echo signal; and / or, correct the ultrasonic fingerprint data generated based on the first echo signal according to the second echo signal.

[0124] In some embodiments, the above-described device can also be used to: perform user authentication using ultrasonic fingerprint data to obtain an authentication result; and perform a matching unlocking operation based on the authentication result.

[0125] It should be noted that the units, devices, or modules described in the above embodiments can be implemented by computer chips or physical entities, or by products with certain functions. For ease of description, the above devices are described by dividing them into various modules according to their functions. Of course, in implementing this specification, the functions of each module can be implemented in one or more software and / or hardware, or the module that implements the same function can be implemented by a combination of multiple sub-modules or sub-units, etc. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection between the devices or units shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be electrical, mechanical, or other forms.

[0126] As can be seen from the above, the ultrasonic fingerprint acquisition device provided in the embodiments of this specification can make full use of the relevant circuit structure in the ultrasonic fingerprint acquisition module, and is well adapted to non-under-screen fingerprint acquisition scenarios such as side fingerprint acquisition and rear fingerprint acquisition. It can acquire ultrasonic fingerprint data at a lower cost and with lower power consumption without relying on the touch control module of the screen.

[0127] In a specific scenario example, see Figure 5 As shown, the ultrasonic fingerprint acquisition module provided in this manual can be applied to the side fingerprint unlocking of a tablet computer. The specific implementation process may include the following:

[0128] In this scenario example, considering that existing ultrasonic fingerprint technology is mostly used under-display, its working mode is as follows: first, the screen's touch control module detects that a finger is pressing on the ultrasonic fingerprint area, and then wakes up the ultrasonic fingerprint module (e.g., the fingerprint acquisition area) to start fingerprint detection. This application mode inevitably requires the use of an external electronic device's touch control module to randomly wake up the ultrasonic fingerprint module, which limits the application scenarios of ultrasonic fingerprint technology.

[0129] In response to the above problems, and considering their root causes, please refer to... Figure 1 As shown, this scenario example provides an ultrasonic fingerprint sensor (e.g., an ultrasonic fingerprint device) with a built-in finger touch detection module, which can be used for ultrasonic fingerprint unlocking on mobile phones, tablets, laptops, etc., without a screen.

[0130] The aforementioned ultrasonic fingerprint sensor integrates a finger touch detection module (e.g., a finger touch detection circuit and a touch sensing area). Based on this structure, ultrasonic fingerprint acquisition is only activated when a finger touches the module. Normally, the ultrasonic fingerprint acquisition function is off, helping to reduce power consumption.

[0131] based on Figure 1 The ultrasonic fingerprint sensor shown is designed for... Figure 5 For the side-mounted fingerprint unlocking scenario shown in the diagram, please refer to the following for specific implementation details. Figure 15 As shown, the process can include the following: First, the touch detection module is activated, and then the touch detection module is used to monitor the finger pressing state. If finger pressing is detected, the ultrasonic fingerprint detection module is activated to collect the fingerprint; otherwise, the touch detection module continues to monitor the finger pressing state. After the fingerprint is collected, it is compared with the fingerprint database to determine whether the user has been successfully authenticated. If authentication is successful, other operations such as device unlocking can be performed. If user authentication fails, the device is illuminated to indicate unlocking failure.

[0132] Specifically, normally, all chip modules of the sensor are in a low-power standby state (or sleep state). When the finger touch detection module detects a finger press, it generates an enable signal in the next clock cycle. This enable signal wakes up other modules within the chip. After these modules enter their working mode, the logic control module first controls the TX module to excite the ultrasonic transducer array to emit ultrasonic waves. The ultrasonic RX module receives the ultrasonic echo signal, and the ADC module converts the ultrasonic echo signal from the RX module into a digital signal. Data communication is then established with the processing unit of the upper-level electronic device through a communication interface. When the finger is removed, the logic control unit continues to control the TX module to emit ultrasonic waves, collecting several echo signals from the fingerless state for calibration of the RX and ADC modules.

[0133] The above scenario examples demonstrate that the ultrasonic fingerprint device provided in this manual is, on the one hand, highly integrated and capable of automatically activating ultrasonic fingerprint recognition without requiring external signals; on the other hand, it has good adaptability and can be widely used in consumer electronics, automotive electronics, home and other environments.

[0134] While this specification provides the steps of operation for the methods described in the embodiments or flowcharts, more or fewer steps may be included based on conventional or non-inventive means. The order of steps listed in the embodiments is merely one possible order of execution among many steps and does not represent the only possible order. In actual device or client product execution, the methods shown in the embodiments or drawings may be executed sequentially or in parallel (e.g., in a parallel processor or multi-threaded processing environment, or even a distributed data processing environment). The terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, product, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, product, or apparatus. Without further limitations, the presence of other identical or equivalent elements in a process, method, product, or apparatus that includes said elements is not excluded. The terms "first," "second," etc., are used to denote names and do not indicate any particular order.

[0135] Those skilled in the art will also know that, besides implementing the controller using purely computer-readable program code, the same functions can be achieved by logically programming the method steps, making the controller function as logic gates, switches, application-specific integrated circuits (ASICs), programmable logic controllers (PLCs), and embedded microcontrollers. Therefore, such a controller can be considered a hardware component, and the devices within it used to implement various functions can also be considered structures within that hardware component. Alternatively, the devices used to implement various functions can be considered as both software modules implementing the method and structures within a hardware component.

[0136] This specification can be described in the general context of computer-executable instructions that are executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, classes, etc., that perform a specific task or implement a specific abstract data type. This specification can also be practiced in distributed computing environments, where tasks are performed by remote processing devices connected via a communication network. In distributed computing environments, program modules can reside in local and remote computer-readable storage media, including storage devices.

[0137] As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that this specification can be implemented by means of software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solutions of this specification can essentially be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, mobile terminal, electronic device, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments of this specification.

[0138] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on its differences from other embodiments. This specification can be used in numerous general-purpose or special-purpose computer system environments or configurations. Examples include: personal computers, electronic computer, handheld or portable devices, tablet devices, multiprocessor systems, microprocessor-based systems, set-top boxes, programmable electronic devices, network PCs, minicomputers, mainframe computers, and distributed computing environments including any of the above systems or devices, etc.

[0139] Although this specification has been described by way of examples, those skilled in the art will know that this application has many variations and modifications, and it is intended that the text described herein include these variations and modifications without departing from the spirit of this specification.

Claims

1. An ultrasonic fingerprint acquisition module, comprising: It includes at least a chip circuit layer, and a fingerprint acquisition area is provided above the chip circuit layer; wherein, the fingerprint acquisition area includes at least: a lower electrode array and a piezoelectric layer; a touch sensing area is also provided outside the fingerprint acquisition area; An inner upper electrode layer is disposed above the piezoelectric layer; an outer upper electrode layer is disposed above the touch sensing area; and the inner upper electrode layer and the outer upper electrode layer are insulated from each other. The chip circuit layer also integrates a finger touch detection circuit; the finger touch detection circuit is connected to the outer upper electrode layer and the processing module. 2.The ultrasonic fingerprint collection module according to claim 1, characterized in that, The touch sensing area includes: a capacitive touch sensing layer; The touch sensing area is arranged around the outside of the fingerprint collection area; the touch sensing area and the fingerprint collection area are located in the same horizontal plane. 3.The ultrasonic fingerprint collection module of claim 1, wherein, The length of the outer upper electrode layer and the perimeter of the fingerprint acquisition area satisfy a preset numerical relationship. 4.The ultrasonic fingerprint collection module of claim 1, wherein, The chip circuit layer is also provided with a first contact pad; the first contact pad is electrically connected to the outer upper electrode layer and the input terminal of the finger touch detection circuit. 5.The ultrasonic fingerprint collection module of claim 1, wherein, The chip circuit layer is also provided with a PAD array; the PAD array is electrically connected to the output terminal of the finger touch detection circuit and the processing module. 6.The ultrasonic fingerprint collection module of claim 1, wherein, The chip circuit layer is also provided with a second contact pad; the second contact pad is electrically connected to the inner upper electrode layer and the ultrasonic transmitting end; The ultrasonic transmitter is also connected to the processing module. 7.The ultrasonic fingerprint collection module according to claim 1, characterized in that, A protective layer is also provided on the outer side of the outer upper electrode layer and the inner upper electrode layer.

8. An ultrasonic fingerprint acquisition method based on the ultrasonic fingerprint acquisition module according to any one of claims 1 to 7, characterized in that, include: When the touch sensor area detects a finger touching the fingerprint collection area, it generates a matching target sensing signal using the touch sensor area; The target sensing signal is transmitted to the finger touch detection circuit using the outer upper electrode layer; The finger touch detection circuit uses the target sensing signal to determine whether a finger is touching the fingerprint collection area, and the proportion of the contact area between the finger and the fingerprint collection area is greater than a preset threshold. When it is determined that a finger is touching the fingerprint collection area, and the contact area between the finger and the fingerprint collection area is greater than a preset threshold, an enable signal is generated by the finger touch detection circuit and transmitted to the processing module. The processing module responds to the enable signal by generating a corresponding voltage in the upper electrode layer within the ring, triggering the fingerprint acquisition area to emit an ultrasonic signal and acquiring the corresponding first echo signal to generate ultrasonic fingerprint data.

9. The method of claim 8, wherein, The method further includes: When the current sensing signal determines that a finger has left the fingerprint acquisition area, a delayed signal is generated using the finger touch detection circuit; and this delayed signal is transmitted to the processing module. The processing module responds to the delayed signal by causing the upper electrode layer inside the coil to continue generating a corresponding voltage during the delayed time period, thereby acquiring the corresponding second echo signal.

10. The method of claim 9, wherein, The method further includes: The ultrasonic receiver and digital-to-analog converter in the ultrasonic fingerprint acquisition module are calibrated using the second echo signal. And / or, The ultrasonic fingerprint data generated based on the first echo signal is corrected according to the second echo signal.

11. The method of claim 8, wherein, The method further includes: User authentication is performed using ultrasonic fingerprint data, and the authentication result is obtained; Based on the verification results, perform the corresponding unlocking operation.

12. An ultrasonic fingerprint acquisition device, characterized by include: The sensing module is used to generate a matching target sensing signal when the touch sensing area detects a finger touching the fingerprint collection area. The first transmission module is used to transmit the target sensing signal to the finger touch detection circuit using the outer upper electrode layer; The determination module is used to determine, based on the target sensing signal, whether a finger is touching the fingerprint collection area and whether the contact area between the finger and the fingerprint collection area is greater than a preset threshold, using the finger touch detection circuit. The second transmission module is used to generate an enable signal using a finger touch detection circuit when it is determined that a finger is touching the fingerprint collection area and the contact area between the finger and the fingerprint collection area is greater than a preset ratio threshold; and to transmit the enable signal to the processing module. The acquisition module is used to respond to the enable signal by the processing module, generate a corresponding voltage in the upper electrode layer of the ring, trigger the fingerprint acquisition area to emit an ultrasonic signal, and acquire the corresponding first echo signal to generate ultrasonic fingerprint data.

13. An electronic device, characterized in that, It includes a processor and a memory for storing processor-executable instructions, wherein the processor, when executing the instructions, implements the steps of the method according to any one of claims 8 to 11.

14. A computer-readable storage medium, characterized in that, It stores computer instructions that, when executed by a processor, implement the steps of the method according to any one of claims 8 to 11.

15. A computer program product, characterized in that, It includes a computer program that, when executed by a processor, implements the steps of the method according to any one of claims 8 to 11.

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