Fingerprint acquisition device, signal processing method and electronic equipment

Abstract

The invention provides a fingerprint acquisition device, a signal processing method and electronic equipment, relates to the technical field of fingerprint identification, and aims to solve the problem of mistaken touch in fingerprint identification. The fingerprint acquisition device comprises a switch and a fingerprint module, the switch comprises a first switch and / or a second switch, the first switch is electrically connected between a pressure-sensitive device and the fingerprint module, and the second switch is electrically connected between the pressure-sensitive device and a processor of the electronic equipment. The capacitance of the pressure-sensitive device changes along with the magnitude of the pressure borne by the pressure-sensitive device; the fingerprint module is electrically connected with a processor of the electronic equipment, and the fingerprint module comprises a pressure detection module and a fingerprint acquisition module; the pressure detection module generates an electric signal corresponding to pressure when a finger touches the fingerprint module, and the fingerprint acquisition module is used for acquiring a fingerprint image.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to the Chinese patent application filed with the China Patent Office on July 26, 2024, with application number: 202411017749.7 and titled “A Fingerprint Recognition Device and Fingerprint Recognition Method,” the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of fingerprint recognition technology, and in particular to a fingerprint acquisition device, a signal processing method, and an electronic device. Background Art

[0003] With the widespread adoption of mobile internet and the mobile phone becoming an essential part of people's daily lives, people are increasingly concerned about mobile phone security. Fingerprint recognition technology has emerged as a result and has quickly become a crucial component of secure authentication for mobile phone unlocking, payment, and other functions. Side fingerprint recognition technology places the fingerprint sensor on the side of the phone, allowing users to quickly unlock or make payments while holding the phone.

[0004] As fingerprint recognition becomes increasingly widely used, the demand for it is becoming more refined. Compared to optical fingerprint recognition, side fingerprint recognition, due to its location on the side of the phone, is more prone to accidental touches when gripping the phone, leading to false triggering of fingerprint recognition, thus affecting the user experience. To address this issue, related technologies have mitigated some of the false triggering issues by collecting images to determine whether they are fingerprint images. However, this still cannot address unintentional hand or finger touches.

[0005] Therefore, how to identify false touches in fingerprint recognition and achieve accurate fingerprint recognition is a technical problem that needs to be solved urgently. Summary of the Invention

[0006] In view of the above problems, embodiments of the present application provide a fingerprint collection device, a signal processing method, and an electronic device to overcome the above problems or at least partially solve the above problems.

[0007] According to a first aspect of the present application, a fingerprint collection device is disclosed, comprising: The switch includes a first switch and / or a second switch, wherein the first switch is electrically connected between the pressure-sensitive device and the fingerprint module, and the second switch is electrically connected between the pressure-sensitive device and the processor of the electronic device, and the capacitance of the pressure-sensitive device changes with the pressure applied to the device; A fingerprint module is electrically connected to the processor of the electronic device. The fingerprint module includes a pressure detection module and a fingerprint acquisition module. The pressure detection module generates an electrical signal corresponding to the pressure when a finger contacts the fingerprint module. The fingerprint acquisition module is used to collect fingerprint images.

[0008] Optionally, the pressure sensing device includes: a detection capacitor composed of a first side electrode plate and a second side electrode plate; The pressure detection module generates an electrical signal corresponding to the pressure when a finger contacts the fingerprint module, including: The charge change of the detection capacitor when the finger touches the fingerprint module; According to the change in charge, an electrical signal corresponding to the pressure is generated.

[0009] Optionally, the first switch and / or the second switch switches states in response to a control signal generated by the processor; Wherein, in a case where the switch includes the first switch and the second switch, one of the first switch and the second switch is in a closed state, and the other is in an open state.

[0010] Optionally, when a finger contacts the surface of the fingerprint module, the first switch is in a closed state; In the default state and when fingerprint recognition fails, the second switch is in a closed state.

[0011] Optionally, the first end of the first switch is connected to the first side electrode plate of the detection capacitor, and the second end of the first switch is connected to the input end of the pressure detection module; A first end of the second switch is connected to the first side electrode plate of the detection capacitor, and a second end of the second switch is connected to the input end of the processor; The second side electrode plate of the detection capacitor is grounded.

[0012] Optionally, the pressure detection module includes: a third switch, a fourth switch, a fifth switch, an integrator, and a signal processing module; The second end of the first switch is connected to the input end of the pressure detection module, including: the second end of the first switch is respectively connected to the first end of the third switch and the first end of the fourth switch; The second end of the third switch is connected to the reference voltage; The fifth switch is connected in parallel with the integration capacitor of the integrator; The input end of the integrator is connected to the second end of the fourth switch, and the output end of the integrator is connected to the input end of the signal processing module.

[0013] Optionally, when the switch includes the first switch, the switch further includes a sixth switch, the fingerprint module further includes a driving voltage module, and the sixth switch is electrically connected between the driving voltage module and the pressure sensing device; In a case where the switch includes a second switch, the switch further includes a seventh switch, and the seventh switch is electrically connected between the pressure sensing device and a ground terminal.

[0014] Optionally, the first switch, the second switch, the sixth switch and the seventh switch switch states in response to a control signal generated by the processor; Among them, when the finger touches the surface of the fingerprint module, the first switch and the sixth switch are in a closed state; in the default state and when fingerprint recognition fails, the second switch and the seventh switch are in a closed state.

[0015] Optionally, the pressure sensing device includes: a detection capacitor composed of a first side electrode plate and a second side electrode plate; A first end of the sixth switch is connected to the output end of the driving voltage module, and a second end of the sixth switch is connected to the second side electrode plate of the detection capacitor; A first end of the seventh switch is grounded, and a second end of the seventh switch is connected to the second side electrode plate of the detection capacitor.

[0016] Optionally, the fingerprint module further includes: a first multi-way switch and a signal processing module; The output end of the pressure detection module is connected to the first input end of the first multi-way switch, the output end of the fingerprint collection module is connected to the second input end of the first multi-way switch, and the output end of the first multi-way switch is connected to the input end of the signal processing module; The processor controls the first multi-way switch to achieve multiplexing of the signal processing module by the pressure detection module and the fingerprint acquisition module.

[0017] Optionally, the pressure-sensitive device is a power button of the electronic device.

[0018] Optionally, the pressure sensing device is arranged between the fingerprint module and a power button of the electronic device, or the power button is arranged between the fingerprint module and the pressure sensing device.

[0019] Optionally, the switch includes the first switch and the second switch, the initial state of the first switch is an open state, and the initial state of the second switch is a closed state.

[0020] Optionally, it further includes: a first circuit board; The pressure sensing device and the fingerprint module are connected via a first circuit board; The switch is disposed on the first circuit board.

[0021] Optionally, it further includes: a second circuit board and a third circuit board; The pressure sensing device is disposed on the second circuit board, and the fingerprint module is disposed on the third circuit board; The first switch and the second switch are disposed on the second circuit board or the third circuit board, and the sixth switch and the seventh switch are disposed on the second circuit board or the third circuit board.

[0022] A second aspect of the embodiments of the present application discloses a signal processing method, which is applied to the fingerprint collection device described in the first aspect of the embodiments of the present application, comprising: When a finger is detected touching a corresponding fingerprint collection area of ​​the fingerprint module, an electrical signal corresponding to the pressure generated by the finger touching the fingerprint module is detected; A corresponding operation is performed according to a comparison result between the electrical signal and the threshold range.

[0023] Optionally, detecting an electrical signal corresponding to the pressure of the finger generated by the fingerprint module includes: Measuring the charge change of the detection capacitor in the pressure sensing device; According to the change in charge, an electrical signal corresponding to the pressure is generated.

[0024] Optionally, different operations are performed according to the comparison result between the electrical signal and the threshold range, including: When the electrical signal is less than a minimum value of the threshold range, determining that the fingerprint collection area is accidentally touched; When the electrical signal is within the threshold range, collecting a fingerprint image by a fingerprint collection module; When the electrical signal is greater than a maximum value of the threshold range, it is determined that the function of the power button is turned on.

[0025] Optionally, generating an electrical signal corresponding to the pressure according to the capacitance change value includes: charging the detection capacitor until the voltage of the detection capacitor is equal to the target voltage; Transferring the charge on the detection capacitor to an integrating capacitor in an integrator, so that the integrator outputs a voltage signal according to the charge transferred to the integrating capacitor; The voltage signal output by the integrator is processed by a signal processing module to obtain an electrical signal corresponding to the pressure.

[0026] A third aspect of the embodiments of the present application discloses an electronic device, comprising: the fingerprint acquisition device described in the first aspect of the embodiments of the present application and a processor, wherein the processor generates a control signal to switch the state of a switch in the fingerprint acquisition device and perform fingerprint recognition based on a fingerprint image.

[0027] The embodiments of the present application include the following advantages: The fingerprint collection device provided in an embodiment of the present application includes a switch and a fingerprint module. The switch includes a first switch and / or a second switch. The first switch is electrically connected between a pressure-sensitive device and a fingerprint module, and the second switch is electrically connected between the pressure-sensitive device and a processor of an electronic device. The capacitance of the pressure-sensitive device changes with the magnitude of the pressure it is subjected to. The fingerprint module is electrically connected to the processor of the electronic device. The fingerprint module includes a pressure detection module and a fingerprint collection module. The pressure detection module generates an electrical signal corresponding to the pressure when a finger contacts the fingerprint module. The fingerprint collection module is used to collect fingerprint images.

[0028] In this way, by controlling the state of the switch, an electrical signal corresponding to the pressure generated when a finger contacts the fingerprint module can be obtained, or the function of a pressure-sensitive device can be realized. The electrical signal corresponding to the pressure generated when a finger contacts the fingerprint module can reflect whether the finger is accidentally touching the fingerprint module or is actually unlocking the fingerprint recognition behavior. Therefore, the fingerprint collection device can only collect fingerprint images when the fingerprint recognition behavior is actually unlocking, avoiding unlocking fingerprint recognition due to accidental touch, thereby improving the user experience. In addition, a pressure detection module and a fingerprint collection module are set in the fingerprint module. The electrical signal corresponding to the pressure generated when the finger contacts the fingerprint module and the fingerprint image are collected by a single chip, thereby minimizing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0030] Figure 1 This is a structural diagram of an existing capacitive fingerprint recognition; Figure 2 This is a structural diagram of a fingerprint collection device provided in an embodiment of the present application; Figure 3 This is a schematic structural diagram of a pressure sensing device provided in an embodiment of the present application; Figure 4 This is a structural diagram of a pressure detection module provided in an embodiment of the present application; Figure 5 This is a structural diagram of another fingerprint collection device provided in an embodiment of the present application; Figure 6 is a structural diagram of another pressure detection module provided in an embodiment of the present application; Figure 7This is a structural diagram of a fingerprint collection device with a multiplexed signal processing module provided in an embodiment of the present application; Figure 8 This is a structural diagram of another fingerprint collection device with a multiplexed signal processing module provided in an embodiment of the present application; Figure 9 This is a schematic diagram of the module structure of a fingerprint collection device provided in an embodiment of the present application; Figure 10 This is a schematic diagram of the module structure of another fingerprint collection device provided in an embodiment of the present application; Figure 11 This is a flowchart of a signal processing method provided by an embodiment of the present application; Figure 12 This is a control timing diagram of a fingerprint collection device provided in an embodiment of the present application; Figure 13 This is a control timing diagram of another fingerprint collection device provided in an embodiment of the present application; Figure 14 This is a structural diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0031] To make the above-mentioned purposes, features, and advantages of this application more clearly understood, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of this application.

[0032] In related technologies, fingerprint recognition is achieved through the principle of capacitive fingerprint recognition, such as Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of an existing capacitive fingerprint recognition system. Specifically, the metal plate M1 and the finger fingerprint form a capacitor, and the signal U1 is applied to the capacitor to detect the fingerprint pattern.

[0033] However, as fingerprint recognition becomes increasingly widely used, the demand for it has become more refined. Compared to optical fingerprint recognition, capacitive fingerprint recognition, due to its location on the side of the phone, is more prone to accidental touches when gripping the phone, leading to false triggering of fingerprint recognition, which in turn affects the user experience. To address this issue, related technologies have mitigated some of the false triggering issues by determining whether the captured image is a fingerprint image. However, it remains difficult to address unintentional hand or finger touches.

[0034] Therefore, the embodiments of the present application provide a fingerprint collection device, a signal processing method and an electronic device. The fingerprint collection device can obtain an electrical signal corresponding to the pressure generated when the finger contacts the fingerprint module or realize the function of a pressure-sensitive device. The electrical signal corresponding to the pressure generated when the finger contacts the fingerprint module can reflect whether it is an accidental touch or a real unlocking fingerprint recognition behavior. Therefore, the fingerprint collection device can collect fingerprint images only when performing a real unlocking fingerprint recognition behavior; specifically, when the finger contacts the fingerprint module, the electrical signal corresponding to the pressure generated when the finger contacts the fingerprint module is first detected. If it is determined that it is a real unlocking fingerprint recognition behavior based on the electrical signal corresponding to the pressure generated when the finger contacts the fingerprint module, the fingerprint image is collected through the fingerprint collection module. In this way, unlocking fingerprint recognition due to accidental touch is avoided, thereby improving the user experience.

[0035] It is understandable that the technical solution of the embodiment of the present application is not limited to side fingerprint recognition. The fingerprint module in the fingerprint collection device of this embodiment can be set not only on the side of the electronic device (for example, a mobile phone), but also on the front or back.

[0036] The fingerprint collection device, signal processing method and electronic device provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0037] Reference Figure 2 As shown, Figure 2 This is a schematic diagram of the structure of a fingerprint collection device provided in an embodiment of the present application. Figure 2 As shown, the fingerprint collection device includes: The switch includes a first switch and / or a second switch, wherein the first switch is electrically connected between the pressure-sensitive device and the fingerprint module, and the second switch is electrically connected between the pressure-sensitive device and the processor of the electronic device, and the capacitance of the pressure-sensitive device changes with the pressure applied to the device; A fingerprint module is electrically connected to the processor of the electronic device. The fingerprint module includes a pressure detection module and a fingerprint acquisition module. The pressure detection module generates an electrical signal corresponding to the pressure when a finger contacts the fingerprint module. The fingerprint acquisition module is used to collect fingerprint images.

[0038] In the embodiments of the present application, the electronic device refers to a user terminal device, such as a mobile phone, a tablet computer, etc. The switch includes a first switch and / or a second switch, the first switch is used to control the on / off of the line between the pressure-sensitive device and the fingerprint module, and the second switch is used to control the on / off of the line between the pressure-sensitive device and the electronic device; the processor of the electronic device controls the state of the switch to obtain an electrical signal corresponding to the pressure generated when the finger contacts the fingerprint module, or inputs the signal generated by the pressure-sensitive device into the processor to realize the function of the pressure-sensitive device. For example, if the electronic device is a mobile phone, the state of the switch is controlled by the input and output ports (IO pins, such as control ports) of the mobile phone CPU (Central Processing Unit).

[0039] When the switch includes only the first switch, the pressure-sensing device is directly electrically connected to the processor of the electronic device to transmit the signal generated by the pressure-sensing device (for example, the power button) to the processor. The pressure-sensing device (for example, a membrane switch) and the processor of the electronic device may not be connected. When the switch includes only the second switch, the pressure-sensing device is directly electrically connected to the fingerprint module. By providing only the first or second switch in the fingerprint acquisition device, the cost and size of the fingerprint acquisition device are reduced. Compared to solutions that only include the first switch, solutions that only include the second switch have minimal noise impact. When both switches are provided, the two lines will not affect each other, and the noise impact is minimized.

[0040] The switch may include both a first switch and a second switch. The first switch controls the connection and disconnection of the line between the pressure-sensing device and the fingerprint module, while the second switch controls the connection and disconnection of the line between the pressure-sensing device and the electronic device, thereby enabling flexible switching between the pressure detection module function and the pressure-sensing device function (e.g., power button function) in the fingerprint collection device. The first and second switches may form a second multi-way switch, which enables switching between the two switches under the control of the processor.

[0041] The fingerprint acquisition module can be either a capacitive or ultrasonic fingerprint acquisition module. Specifically, the pressure detection module generates an electrical signal corresponding to the pressure when a finger contacts the fingerprint module. When the processor determines that a fingerprint image needs to be acquired based on the electrical signal, the fingerprint acquisition module acquires the fingerprint image.

[0042] In the embodiment of the present application, by controlling the state of the switch, an electrical signal corresponding to the pressure generated when a finger contacts the fingerprint module can be obtained, or the function of a pressure-sensitive device can be realized. The electrical signal corresponding to the pressure generated when the finger contacts the fingerprint module can reflect whether the finger is accidentally touching or actually unlocking the fingerprint recognition behavior. Therefore, the fingerprint acquisition device can only collect fingerprint images when the actual unlocking fingerprint recognition behavior is being performed, avoiding unlocking fingerprint recognition due to accidental touch, thereby improving the user experience. In addition, a pressure detection module and a fingerprint acquisition module are set in the fingerprint module, and a chip is used to measure the electrical signal corresponding to the pressure generated when the finger contacts the fingerprint module and collect fingerprint images, thereby minimizing costs.

[0043] In an optional embodiment, the first switch and / or the second switch switches state in response to a control signal generated by the processor; wherein, when the switch includes the first switch and the second switch, one of the first switch and the second switch is in a closed state and the other is in an open state.

[0044] In an embodiment of the present application, a processor of an electronic device controls the state of a first switch and / or a second switch. The first switch and / or the second switch switch in response to a control signal generated by the processor to switch between states, thereby implementing the functions of the pressure detection module and the fingerprint acquisition module in the fingerprint acquisition device. Specifically, when a finger contacts the fingerprint module, the pressure detection module generates an electrical signal corresponding to the pressure. Based on the electrical signal, the sensor determines whether a fingerprint image needs to be captured. If a fingerprint image needs to be captured, the fingerprint acquisition module captures the fingerprint image. In some embodiments, the pressure-sensitive device is a power button. The first switch and / or the second switch switch in response to a control signal generated by the processor to switch between states, thereby implementing flexible switching between the pressure detection module and the pressure-sensitive device in the fingerprint acquisition device. Specifically, when a finger contacts the fingerprint module, the pressure detection module generates an electrical signal corresponding to the pressure. Based on the electrical signal, the sensor determines the operation to be performed. If the operation to be performed is to enable the pressure-sensitive device function, the circuit between the pressure-sensitive device and the electronic device is connected, and the signal generated by the pressure-sensitive device is input to the processor to enable the pressure-sensitive device function. The first switch and the second switch can constitute a second multi-way switch, which can select one of the two switches under the control of the processor.

[0045] Specifically, when a finger contacts the surface of the fingerprint module, the first switch is in a closed state; in a default state or when fingerprint recognition fails, the second switch is in a closed state.

[0046] If the switch only includes the first switch, when the finger touches the surface of the fingerprint module, the first switch is in a closed state, and the pressure detection module generates an electrical signal corresponding to the pressure when the finger touches the fingerprint module. When it is determined based on the electrical signal that a fingerprint image needs to be collected, the fingerprint image is collected through the fingerprint collection module, and the first switch is still in a closed state.

[0047] If the switch only includes the second switch, when a finger contacts the surface of the fingerprint module, the second switch is in the open state. The pressure detection module generates an electrical signal corresponding to the pressure when the finger contacts the fingerprint module. When the electrical signal determines that a fingerprint image needs to be captured, the fingerprint capture module captures the fingerprint image, and the second switch remains in the open state. The second switch is in the closed state in the default state and if fingerprint recognition fails. That is, in the locked state, the second switch is closed to detect in real time whether the pressure-sensitive device (for example, the power button) is activated.

[0048] If the switch includes a first switch and a second switch, in the default state, the second switch is closed and the first switch is open. When the finger touches the surface of the fingerprint module, the first switch is in a closed state and the second switch is in an open state. The pressure detection module generates an electrical signal corresponding to the pressure when the finger touches the fingerprint module. When it is determined based on the electrical signal that a fingerprint image needs to be collected, the fingerprint image is collected through the fingerprint collection module. At this time, the first switch is still in a closed state and the second switch is still in an open state. When it is determined based on the electrical signal that the function of the pressure-sensitive device (power button) needs to be realized, the first switch is in an open state and the second switch is in a closed state, so as to connect the line between the pressure-sensitive device and the electronic device, input the signal generated by the pressure-sensitive device into the processor, and realize the function of the pressure-sensitive device.

[0049] In the default state and when fingerprint recognition fails, the second switch is in a closed state, and the pressure-sensitive device performs its own function. For example, if the pressure-sensitive device is a power button, it performs its function as a power button.

[0050] In an optional embodiment, the switch includes the first switch and the second switch, the initial state of the first switch is an open state, and the initial state of the second switch is a closed state.

[0051] In the embodiment of the present application, the initial state of the first switch is the open state, which means that the first switch is a normally open switch, and the initial state of the second switch is the closed state, which means that the second switch is a normally closed switch. In the initial state, the pressure sensing device realizes its own function. Figure 2 As shown, the initial state of the first switch is the open state, and the initial state of the second switch is the closed state, connecting the line between the pressure sensing device and the processor of the electronic device to realize the function of the pressure sensing device itself.

[0052] In an optional embodiment, the pressure-sensitive device is a power button of the electronic device.

[0053] In this way, the fingerprint collection device reuses the power button of the electronic device as a pressure-sensitive device, eliminating the need for additional components within the electronic device and reducing costs. Furthermore, the functions of the pressure-sensitive device and the fingerprint collection device are independent of each other, so if the fingerprint collection device is damaged, the function of the pressure-sensitive device will not be affected.

[0054] In an optional embodiment, the pressure sensing device is arranged between the fingerprint module and the power button of the electronic device, or the power button is arranged between the fingerprint module and the pressure sensing device.

[0055] In the embodiment of the present application, the pressure-sensing device is a device independent of the power button. For example, the pressure-sensing device can be a separate membrane switch or pot. By placing the pressure-sensing device between the fingerprint module and the power button of the electronic device, or placing the power button between the fingerprint module and the pressure-sensing device, when a finger touches the fingerprint module, the pressure-sensing device is subjected to corresponding pressure, so that the capacitance of the pressure-sensing device changes with the magnitude of the pressure, causing the pressure detection module to generate an electrical signal corresponding to the pressure.

[0056] For example, Figure 3 This is a structural schematic diagram of a pressure-sensitive device provided in an embodiment of the present application, wherein the pressure-sensitive device includes: a detection capacitor composed of a first side electrode plate and a second side electrode plate, and may also include a cover plate above the first side electrode plate and a base plate below the second side electrode plate; the pressure detection module generates an electrical signal corresponding to the pressure when the finger contacts the fingerprint module, including: a charge change of the detection capacitor when the finger contacts the fingerprint module; and an electrical signal corresponding to the pressure is generated according to the charge change.

[0057] In an embodiment of the present application, when a finger contacts the fingerprint module, the pressure causes the distance between the first and second electrode plates of the pressure-sensitive device to change, thereby detecting changes in the charge and capacitance of the capacitor. The pressure detection module generates an electrical signal corresponding to the pressure based on the charge change. The processor of the electronic device performs corresponding operations based on the electrical signal corresponding to the pressure. For example, if it is determined based on the electrical signal corresponding to the pressure that the user is performing a real unlocking fingerprint recognition behavior, the state of the switch can be controlled, and the fingerprint collection module in the fingerprint collection device can collect a fingerprint image.

[0058] Specifically, the first end of the first switch is connected to the first side electrode plate of the detection capacitor, and the second end of the first switch is connected to the input end of the pressure detection module; the first end of the second switch is connected to the first side electrode plate of the detection capacitor, and the second end of the second switch is connected to the input end of the processor; the second side electrode plate of the detection capacitor is grounded.

[0059] In this way, by controlling the state of the first switch and / or the second switch, independent switching of the pressure sensing device function and the pressure detection module function can be achieved, reducing the impact on the original design of the electronic device and increasing the cost less. In addition, if the fingerprint collection device is damaged, the function of the pressure sensing device will not be affected.

[0060] In an alternative embodiment, referring to Figure 4 As shown, Figure 4 is a structural diagram of a pressure detection module provided in an embodiment of the present application, wherein the pressure detection module includes: a third switch, a fourth switch, a fifth switch, an integrator, and a signal processing module; Specifically, the second end of the first switch is connected to the first end of the third switch and the first end of the fourth switch respectively; the second end of the third switch is connected to a reference voltage; the fifth switch is connected in parallel with the integration capacitor of the integrator; the input end of the integrator is connected to the second end of the fourth switch, and the output end of the integrator is connected to the input end of the signal processing module.

[0061] In an embodiment of the present application, when a finger touches the surface of the fingerprint module, the first switch is closed, and the processor of the electronic device controls the states of the third switch, the fourth switch, and the fifth switch so that the pressure detection module generates an electrical signal corresponding to the pressure when the finger touches the fingerprint module.

[0062] The third switch is used to control the connection between the reference voltage and the detection capacitor. When the third switch is closed, the line between the reference voltage and the detection capacitor is connected, and the detection capacitor in the pressure-sensitive device is charged by controlling the reference voltage. The fourth switch is used to control the connection between the detection capacitor and the integrator input. When the fourth switch is closed, the charge on the detection capacitor is transferred to the integrating capacitor in the integrator, so that the integrator outputs a voltage signal based on the charge transferred to the integrating capacitor. The fifth switch is connected in parallel with the integrating capacitor of the integrator and is used to reset the integrating capacitor. That is, when the fifth switch is closed, the potential of the integrating capacitor is reset to 0.

[0063] The signal processing module includes an amplifier and an analog-to-digital converter. In a specific implementation, the third, fourth, and fifth switches are controlled to transfer the charge on the detection capacitor in the pressure-sensing device to the integrating capacitor in the integrator, so that the integrator outputs a voltage signal based on the charge transferred to the integrating capacitor. The voltage signal output by the integrator is then processed by the signal processing module to obtain an electrical signal corresponding to the pressure. Finally, the fingerprint module transmits the electrical signal corresponding to the pressure to the processor of the electronic device through an electrical connection (for example, an ISP bus) with the processor, so that the processor can subsequently perform corresponding operations based on the electrical signal corresponding to the pressure.

[0064] In an alternative embodiment, referring to Figure 5 As shown, Figure 5 : This is a schematic diagram of the structure of another fingerprint collection device provided in an embodiment of the present application. Specifically, the fingerprint collection device includes: A fingerprint module is electrically connected to the processor of the electronic device. The fingerprint module includes a pressure detection module and a fingerprint acquisition module. The pressure detection module generates an electrical signal corresponding to the pressure when a finger contacts the fingerprint module. The fingerprint acquisition module is used to collect fingerprint images.

[0065] Switch, when the switch includes a first switch, the switch also includes a sixth switch, the fingerprint module also includes a driving voltage module, and the sixth switch is electrically connected between the driving voltage module and the pressure sensing device; when the switch includes a second switch, the switch also includes a seventh switch, and the seventh switch is electrically connected between the pressure sensing device and the ground terminal.

[0066] In an embodiment of the present application, the driving voltage module is used to output a driving voltage to the pressure-sensitive device to control the charging of the detection capacitor of the pressure-sensitive device. The first switch is used to control the on-off of the line between the pressure-sensitive device and the fingerprint module, the second switch is used to control the on-off of the line between the pressure-sensitive device and the electronic device, the sixth switch is used to control the on-off of the line between the driving voltage module and the pressure-sensitive device, and the seventh switch is used to control the on-off of the line between the pressure-sensitive device and the ground terminal. Among them, the sixth switch and the seventh switch can constitute a third multi-way switch, which realizes the selection of two switches according to the control of the processor. The processor of the electronic device controls the state of the switch to obtain the electrical signal corresponding to the pressure generated when the finger contacts the fingerprint module, or inputs the signal generated by the pressure-sensitive device into the processor to realize the function of the pressure-sensitive device.

[0067] When the switch includes only the first and sixth switches, the pressure-sensing device is directly electrically connected to the processor of the electronic device or is not connected, and the other end of the pressure-sensing device is directly grounded. When the switch includes only the second and seventh switches, the pressure-sensing device is directly electrically connected to the fingerprint module. By providing only the first and sixth switches, or only the second and seventh switches, the fingerprint collection device can be reduced in cost and size, and the impact of noise can be minimized.

[0068] The switch can include a first switch, a second switch, a sixth switch and a seventh switch at the same time. The first switch and the sixth switch are used to control the on / off of the line between the pressure sensing device and the fingerprint module, and the second switch and the seventh switch are used to control the on / off of the line between the pressure sensing device and the electronic device. In this way, flexible switching of the pressure detection module function and the pressure sensing device function (for example, the power button function) in the fingerprint collection device is achieved.

[0069] In the embodiment of the present application, by controlling the state of the switch, an electrical signal corresponding to the pressure generated when a finger contacts the fingerprint module can be obtained, or the function of a pressure-sensitive device can be realized. The electrical signal corresponding to the pressure generated when the finger contacts the fingerprint module can reflect whether the finger is accidentally touching or actually unlocking the fingerprint recognition behavior. Therefore, the fingerprint acquisition device can only collect fingerprint images when the actual unlocking fingerprint recognition behavior is being performed, avoiding unlocking fingerprint recognition due to accidental touch, thereby improving the user experience. In addition, a pressure detection module and a fingerprint acquisition module are set in the fingerprint module, and a chip is used to measure the electrical signal corresponding to the pressure generated when the finger contacts the fingerprint module and collect fingerprint images, thereby minimizing costs.

[0070] In an optional embodiment, the first switch, the second switch, the sixth switch, and the seventh switch switch states in response to a control signal generated by the processor; Among them, when the finger touches the surface of the fingerprint module, the first switch and the sixth switch are in a closed state; in the default state and when fingerprint recognition fails, the second switch and the seventh switch are in a closed state.

[0071] In an embodiment of the present application, the states of the first, second, sixth, and seventh switches are controlled by a processor of an electronic device. The first, second, sixth, and seventh switches switch states in response to control signals generated by the processor to implement the pressure detection module and fingerprint acquisition module functions in the fingerprint acquisition device. Specifically, the pressure detection module generates an electrical signal corresponding to pressure when a finger contacts the fingerprint module, and then determines whether to capture a fingerprint image based on the electrical signal. If fingerprint image capture is required, the fingerprint acquisition module captures the fingerprint image. In some embodiments, the pressure-sensitive device is a power button, and the first and / or second switches switch states in response to control signals generated by the processor, enabling flexible switching between the pressure detection module and pressure-sensitive device functions in the fingerprint acquisition device. Specifically, the pressure detection module generates an electrical signal corresponding to pressure when a finger contacts the fingerprint module, and then determines the operation to be performed based on the electrical signal. If the operation to be performed is to enable the pressure-sensitive device function, the circuit between the pressure-sensitive device and the electronic device is connected, and the signal generated by the pressure-sensitive device is input to the processor to implement the pressure-sensitive device function.

[0072] If the switch only includes the first switch and the sixth switch, when the finger contacts the surface of the fingerprint module, the first switch and the sixth switch are in a closed state, and the pressure detection module generates an electrical signal corresponding to the pressure when the finger contacts the fingerprint module. When it is determined based on the electrical signal that a fingerprint image needs to be collected, the fingerprint image is collected by the fingerprint collection module. At this time, the first switch and the sixth switch are still in a closed state.

[0073] If the switch only includes the second switch and the seventh switch, when a finger contacts the surface of the fingerprint module, the second switch and the seventh switch are in the disconnected state, and the pressure detection module generates an electrical signal corresponding to the pressure when the finger contacts the fingerprint module. When it is determined based on the electrical signal that a fingerprint image needs to be collected, the fingerprint collection module collects the fingerprint image, and at this time the second switch and the seventh switch are still in the disconnected state.

[0074] If the switch includes a first switch, a second switch, a sixth switch, and a seventh switch, in a default state, the second switch and the seventh switch are closed, and the first switch and the sixth switch are opened. When a finger contacts the surface of the fingerprint module, the first switch and the sixth switch are closed, and the second switch and the seventh switch are opened. The pressure detection module generates an electrical signal corresponding to the pressure when the finger contacts the fingerprint module. When it is determined based on the electrical signal that a fingerprint image needs to be collected, the fingerprint image is collected by the fingerprint collection module. At this time, the first switch and the sixth switch are still closed, and the second switch and the seventh switch are still opened. When it is determined based on the electrical signal that the function of the pressure-sensitive device (power button) needs to be implemented, the first switch and the sixth switch are opened, and the second switch and the seventh switch are closed, so as to connect the line between the pressure-sensitive device and the electronic device, input the signal generated by the pressure-sensitive device into the processor, and implement the function of the pressure-sensitive device.

[0075] In the default state and when fingerprint recognition fails, the second switch and the seventh switch are in a closed state, and the pressure-sensitive device performs its own function. For example, if the pressure-sensitive device is a power button, it performs its function as a power button.

[0076] In an optional embodiment, the pressure sensing device includes: a detection capacitor composed of a first side electrode plate and a second side electrode plate; the first end of the sixth switch is connected to the output end of the driving voltage module, and the second end of the sixth switch is connected to the second side electrode plate of the detection capacitor; the first end of the seventh switch is grounded, and the second end of the seventh switch is connected to the second side electrode plate of the detection capacitor.

[0077] In this way, by controlling the states of the first, second, sixth, and seventh switches, the pressure sensing device and the pressure detection module functions can be independently switched, minimizing the impact on the original design of the electronic device and increasing costs. Damage to the fingerprint collection device does not affect the function of the pressure sensing device. Furthermore, the driving voltage module outputs a driving voltage to the pressure sensing device to control the charging of the detection capacitor of the pressure sensing device, thereby improving the anti-interference performance of the fingerprint collection device.

[0078] Reference Figure 6 As shown, Figure 6 is a structural diagram of another pressure detection module provided in an embodiment of the present application, wherein the pressure detection module includes: a third switch, a fourth switch, a fifth switch, an integrator, and a signal processing module; Specifically, the first end of the sixth switch is connected to the output end of the driving voltage module, and the second end of the sixth switch is connected to the second side electrode plate of the detection capacitor; the second end of the first switch is respectively connected to the first end of the third switch and the first end of the fourth switch; the second end of the third switch is connected to the reference voltage; the fifth switch is connected in parallel with the integration capacitor of the integrator; the input end of the integrator is connected to the second end of the fourth switch, and the output end of the integrator is connected to the input end of the signal processing module.

[0079] In an embodiment of the present application, when a finger contacts the surface of the fingerprint module, the first and sixth switches are closed, and the second and seventh switches are opened. The processor of the electronic device controls the states of the third, fourth, and fifth switches so that the pressure detection module generates an electrical signal corresponding to the pressure when the finger contacts the fingerprint module. The third switch is used to control the connection and disconnection of the circuit between the reference voltage and the detection capacitor. When the third switch is closed, the circuit between the reference voltage and the detection capacitor is connected, and the reference voltage is used to charge the detection capacitor in the pressure-sensitive device. When the third switch is open, the drive voltage module is controlled to produce a square wave signal to drive the second electrode plate of the detection capacitor to achieve charging control of the detection capacitor. The fourth switch is used to control the connection and disconnection of the circuit from the detection capacitor to the input of the integrator. When the fourth switch is closed, the charge on the detection capacitor is transferred to the integrating capacitor of the integrator, so that the integrator outputs a voltage signal based on the charge transferred to the integrating capacitor. The fifth switch is connected in parallel with the integrating capacitor of the integrator and is used to reset the integrating capacitor. When the fifth switch is closed, the potential of the integrating capacitor is reset to 0.

[0080] The signal processing module includes an amplifier and an analog-to-digital converter. In a specific implementation, the third switch, the fourth switch, and the fifth switch are controlled to transfer the charge on the detection capacitor in the pressure-sensitive device to the integrating capacitor in the integrator, so that the integrator outputs a voltage signal according to the charge transferred to the integrating capacitor. The voltage signal output by the integrator is then processed by the signal processing module to obtain an electrical signal corresponding to the pressure. Finally, the fingerprint module transmits the electrical signal corresponding to the pressure to the processor of the electronic device through an electrical connection with the processor of the electronic device (for example, an ISP bus), so that the processor can subsequently perform corresponding operations based on the electrical signal corresponding to the pressure.

[0081] In an alternative embodiment, referring to Figure 7 As shown, Figure 7 This is a schematic diagram of the structure of a fingerprint collection device with a multiplexed signal processing module provided in an embodiment of the present application. Figure 7 As shown, the fingerprint collection device includes: The switch includes a first switch and / or a second switch, wherein the first switch is electrically connected between the pressure-sensitive device and the fingerprint module, and the second switch is electrically connected between the pressure-sensitive device and the processor of the electronic device, and the capacitance of the pressure-sensitive device changes with the magnitude of the pressure it is subjected to.

[0082] A fingerprint module is electrically connected to the processor of the electronic device. The fingerprint module includes a pressure detection module and a fingerprint acquisition module. The pressure detection module generates an electrical signal corresponding to the pressure when a finger contacts the fingerprint module. The fingerprint acquisition module is used to collect fingerprint images.

[0083] a first multi-way switch and a signal processing module; the output end of the pressure detection module is connected to the first input end of the first multi-way switch, the output end of the fingerprint acquisition module is connected to the second input end of the first multi-way switch, and the output end of the first multi-way switch is connected to the input end of the signal processing module; the processor realizes the multiplexing of the pressure detection module and the fingerprint acquisition module to the signal processing module by controlling the first multi-way switch.

[0084] In the embodiment of the present application, when a finger contacts the surface of the fingerprint module, the processor of the electronic device controls the first input terminal and the output terminal of the first multi-way switch to connect, so that an electrical signal corresponding to the pressure is obtained through the pressure detection module and the signal processing module. When a fingerprint image needs to be captured, the processing unit of the electronic device controls the second input terminal and the output terminal of the first multi-way switch to connect, so that the fingerprint capture module and the signal processing module can obtain the captured fingerprint image.

[0085] In the case of a multiplexed signal processing module, the pressure detection module does not include a signal processing module consisting of an amplifier and a digital-to-analog converter. In this case, the pressure detection module includes: a third switch, a fourth switch, a fifth switch, and an integrator. In addition, the second end of the first switch is connected to the first end of the third switch and the first end of the fourth switch respectively; the second end of the third switch is connected to a reference voltage; the fifth switch is connected in parallel with the integrating capacitor of the integrator; the input end of the integrator is connected to the second end of the fourth switch, and the output end of the integrator is connected to the first input end of the first multiplexer. Specifically, when a finger touches the surface of the fingerprint module, the first switch is closed and the second switch is opened, and the states of the third, fourth, and fifth switches in the pressure detection module are controlled to transfer the charge on the detection capacitor in the pressure sensing device to the integrating capacitor in the integrator, so that the integrator outputs a voltage signal based on the charge transferred to the integrating capacitor. The voltage signal output by the integrator is then input into the signal processing module through the first multiplexer for signal processing to obtain an electrical signal corresponding to the pressure.

[0086] In the case of a multiplexed signal processing module, the fingerprint acquisition module includes a fingerprint pixel array and a fingerprint acquisition analog front end. When a fingerprint image needs to be acquired, the fingerprint pixel array and fingerprint acquisition analog front end in the fingerprint acquisition module collect the fingerprint pattern signal of the finger, and the collected fingerprint pattern signal is input to the signal processing module through the first multiplexer for processing, thereby obtaining a fingerprint image.

[0087] In this way, by controlling the first multi-way switch, the pressure detection module and the fingerprint acquisition module can reuse the signal processing module, thereby eliminating the need to configure separate signal processing modules for the pressure detection module and the fingerprint acquisition module, thereby reducing the cost of the fingerprint acquisition device.

[0088] Reference Figure 8 As shown, Figure 8 This is a schematic diagram of the structure of another fingerprint collection device with multiplexed signal processing module provided in an embodiment of the present application. Figure 8 As shown, the fingerprint collection device includes: The switch includes a first switch, a second switch, a sixth switch, and a seventh switch, wherein the first switch is electrically connected between the pressure-sensitive device and the fingerprint module, the second switch is electrically connected between the pressure-sensitive device and the processor of the electronic device, the sixth switch is electrically connected between the driving voltage module and the pressure-sensitive device, and the seventh switch is electrically connected between the pressure-sensitive device and the ground terminal.

[0089] A fingerprint module is electrically connected to the processor of the electronic device. The fingerprint module includes a pressure detection module, a fingerprint acquisition module and a driving voltage module. The pressure detection module generates an electrical signal corresponding to the pressure when a finger contacts the fingerprint module. The fingerprint acquisition module is used to collect fingerprint images.

[0090] a first multi-way switch and a signal processing module; the output end of the pressure detection module is connected to the first input end of the first multi-way switch, the output end of the fingerprint acquisition module is connected to the second input end of the first multi-way switch, and the output end of the first multi-way switch is connected to the input end of the signal processing module; the processor realizes the multiplexing of the pressure detection module and the fingerprint acquisition module to the signal processing module by controlling the first multi-way switch.

[0091] In an embodiment of the present application, when a finger contacts the surface of the fingerprint module, the processing unit of the electronic device controls the first and sixth switches to close, and the second and seventh switches to open, thereby connecting the first input and output terminals of the first multi-way switch to obtain an electrical signal corresponding to the pressure through the pressure detection module and the signal processing module. When a fingerprint image needs to be captured, the processing unit of the electronic device controls the second input and output terminals of the first multi-way switch to connect to obtain the captured fingerprint image through the fingerprint capture module and the signal processing module.

[0092] In this way, by controlling the first multi-way switch, the pressure detection module and the fingerprint acquisition module can reuse the signal processing module, thereby eliminating the need to configure separate signal processing modules for the pressure detection module and the fingerprint acquisition module, thereby reducing the cost of the fingerprint acquisition device.

[0093] In an optional embodiment, the fingerprint collection device further includes: a first circuit board; the pressure-sensing device and the fingerprint module are connected via the first circuit board; and the switch is disposed on the first circuit board. The fingerprint module and the pressure-sensing device are disposed on the same module and connected via a circuit board (the first circuit board).

[0094] For example, Figure 9 This is a schematic diagram of the module structure of a fingerprint collection device provided in an embodiment of the present application. The first circuit board includes a first FPC and a first PCB board above it. The first FPC is fixed in shape by a steel plate structure. The first PCB board is an LGA PCB substrate (Land Grid Array, Printed Circuit Board). The chip (i.e., die, which integrates a pressure detection module and a fingerprint collection module) is fixed to the first PCB board by die bond (wherein die bond is a chip fixing method). DAF glue (DAF is a film material used for electronic packaging) is used between the die and the first PCB board. The chip is connected to the circuit board pad (PCB pad) through a gold wire bonding process through the surface pad of the chip. The EMC (Electromagnetic Compatibility) is encapsulated on the chip surface through a molding process (the encapsulated chip is a fingerprint module). Finally, a coating is covered on the top of the EMC. The color of the coating is generally consistent with the appearance of the electronic device.

[0095] In an optional embodiment, the fingerprint collection device also includes: a second circuit board and a third circuit board; the pressure sensing device is deployed on the second circuit board, and the fingerprint module is deployed on the third circuit board; the first switch and the second switch are deployed on the second circuit board or the third circuit board, and the sixth switch and the seventh switch are deployed on the second circuit board or the third circuit board.

[0096] For example, Figure 10 This is a schematic diagram of the module structure of another fingerprint collection device provided in an embodiment of the present application. The second circuit board and the third circuit board are connected to the processor of the same electronic device through a connector. Similarly, the second circuit board includes a second FPC and a second PCB board above it. The second PCB board is an LGA PCB substrate. The chip (i.e., the die, which integrates the pressure detection module and the fingerprint collection module) is fixed on the second PCB board by die bond. DAF glue is used between the die and the second PCB board. The chip is connected to the PCB pad through the surface pad through a gold wire bonding process. The EMC is encapsulated on the chip surface through a molding process (the encapsulated chip is a fingerprint module). Finally, a layer of coating is covered on the top of the EMC. The color of the coating is generally consistent with the appearance of the electronic device.

[0097] In the embodiments of the present application, two deployment methods for fingerprint collection devices are provided. Based on the current pressure-sensitive device and fingerprint collection module, only a small number of switches need to be added to the flexible printed circuit board (FPC). This deployment method is easy to implement and has a low cost increase.

[0098] The present application also provides a signal processing method, referring to Figure 11 As shown, Figure 11 1 is a flowchart of a signal processing method provided in an embodiment of the present application. The method is applied to the fingerprint collection device in an embodiment of the present application, including steps S1110 to S1120: Step S1110: When it is detected that a finger contacts the corresponding fingerprint collection area of ​​the fingerprint module, an electrical signal corresponding to the pressure generated by the finger contacting the fingerprint module is detected.

[0099] Step S1120: performing a corresponding operation according to the comparison result between the electrical signal and the threshold range.

[0100] In the embodiments of the present application, if a finger is detected contacting the fingerprint module's corresponding fingerprint collection area, it indicates that the user is performing fingerprint unlocking, or that the user's finger has accidentally touched the fingerprint collection area, or is activating the function of the pressure-sensitive device itself. Because different operations generate different pressures, the user's true intention can be identified based on the electrical signal corresponding to the pressure generated by the finger contacting the fingerprint module, and the corresponding operation can be performed. In particular, this avoids unlocking fingerprint recognition due to accidental touch, thereby improving the user experience.

[0101] In an optional embodiment, the step of “performing different operations according to the comparison result between the electrical signal and the threshold range” in step S1120 specifically includes steps S1120-1 to S1120-3: Step S1120-1: When the electrical signal is smaller than the minimum value of the threshold range, determine that the fingerprint collection area is accidentally touched.

[0102] Step S1120 - 2 : When the electrical signal is within the threshold range, a fingerprint image is collected by a fingerprint collection module.

[0103] Step S1120 - 3 : When the electrical signal is greater than the maximum value of the threshold range, determine to turn on the power button function.

[0104] In this embodiment of the present application, the threshold range is set based on the pressure generated by the actual unlocking behavior. Because different operations generate different pressures, the corresponding electrical signals are also different. When the user accidentally touches the fingerprint collection area, the pressure generated is smaller, and the corresponding electrical signal is also smaller. Therefore, when the electrical signal is less than the minimum value of the threshold range, it is determined that the user accidentally touched the fingerprint collection area.

[0105] When the user needs to enable the function of the power button (pressure-sensitive device), the pressure generated is greater, and the electrical signal corresponding to the pressure is also greater. Therefore, when the electrical signal is greater than the maximum value of the threshold range, it is determined that the power button function is enabled.

[0106] When the user needs to unlock the phone, the pressure generated is between a false touch and enabling the power button function. Therefore, when the electrical signal is within the threshold range, it is determined that the user's true intention is to unlock the phone. At this time, the fingerprint image is collected by the fingerprint collection module.

[0107] In this way, the user's true intention is identified based on the comparison result of the electrical signal corresponding to the pressure generated by the finger contacting the fingerprint module with the threshold range, thereby improving the user experience.

[0108] In an optional embodiment, the "detecting the electrical signal corresponding to the pressure generated by the fingerprint module according to the finger" in step S1110 specifically includes: measuring the charge change of the detection capacitor in the pressure-sensitive device; and generating an electrical signal corresponding to the pressure based on the charge change.

[0109] In an embodiment of the present application, the pressure-sensing device includes a detection capacitor composed of a first side electrode plate and a second side electrode plate. When a finger touches the fingerprint module, the charge between the first side electrode plate and the second side electrode plate of the pressure-sensing device changes, and then the pressure detection module generates an electrical signal corresponding to the pressure based on the charge change.

[0110] Specifically, according to the charge change, an electrical signal corresponding to the pressure is generated, including steps A1 to A3: Step A1: charging the detection capacitor until the voltage of the detection capacitor is equal to the target voltage.

[0111] Step A2: transferring the charge on the detection capacitor to an integrating capacitor in an integrator, so that the integrator outputs a voltage signal according to the charge transferred to the integrating capacitor.

[0112] Step A3: performing signal processing on the voltage signal output by the integrator through a signal processing module to obtain an electrical signal corresponding to the pressure.

[0113] In an embodiment of the present application, when a finger touches the fingerprint module, the capacitance of the detection capacitor in the pressure-sensing device changes with the magnitude of the pressure it is subjected to. At this time, by charging the detection capacitor in the pressure-sensing device, the change in capacitance will cause the charge on the detection capacitor to change. Therefore, the electrical signal corresponding to the pressure can be determined based on the charge on the detection capacitor, that is, the charge on the detection capacitor is transferred to the integrating capacitor in the integrator, so that the integrator outputs a voltage signal based on the charge transferred to the integrating capacitor, and obtains an electrical signal corresponding to the pressure based on the voltage signal.

[0114] Specifically, the signal processing module includes an amplifier and an analog-to-digital converter; the signal processing module performs signal processing on the voltage signal output by the integrator to obtain an electrical signal corresponding to the pressure, including: using the amplifier to amplify the voltage signal output by the integrator to a certain amplitude, and converting the amplified voltage signal into a digital signal through the analog-to-digital converter, and finally obtaining an electrical signal corresponding to the pressure based on the digital signal.

[0115] The present application provides a variety of fingerprint collection devices. Figure 2 Neutralization Figure 5 The process of obtaining the electrical signal corresponding to the pressure of the two fingerprint collection devices shown in the figure is explained.

[0116] (1) Based on Figure 2 The fingerprint acquisition device shown in obtains an electrical signal corresponding to the pressure: Specifically, charging the detection capacitor includes steps B1 to B2: Step B1: close the first switch and open the second switch; Step B2: After the first time interval, the third switch is closed to connect the line between the reference voltage and the detection capacitor, and the detection capacitor is charged by the reference voltage.

[0117] For example, Figure 2 The pressure detection module of the fingerprint collection device shown in FIG. Figure 4 As shown, when a finger touches the fingerprint module, the first switch is closed and the second switch is opened to connect the line between the detection capacitor of the pressure sensing device and the pressure detection module. After a first time interval after the connection, the third switch is closed to charge the detection capacitor through the reference voltage.

[0118] Specifically, transferring the charge on the detection capacitor to the integration capacitor in the integrator includes steps C1 to C2: Step C1: opening the third switch and closing the fourth switch to connect the line between the detection capacitor and the integrating capacitor in the integrator, and transferring the charge on the detection capacitor to the integrating capacitor in the integrator; Step C2: alternately closing the third switch and the fourth switch to transfer the charge on the detection capacitor to the integration capacitor in the integrator multiple times.

[0119] like Figure 4 As shown, after the detection capacitor is fully charged, the third switch is opened and the fourth switch is closed to transfer the charge on the detection capacitor to the integrating capacitor in the integrator. Furthermore, by alternately closing the third and fourth switches, the charge on the detection capacitor is transferred multiple times to the integrating capacitor in the integrator. This multiple charge accumulation increases the pressure of the voltage signal, reduces driving noise, and thus improves the accuracy and signal-to-noise ratio of the voltage signal.

[0120] Furthermore, in order to obtain accurate pressure information, before transferring the charge on the detection capacitor to the integration capacitor in the integrator, the method further includes: closing the fifth switch to reset the integration capacitor in the integrator, so as to reset the potential of the integration capacitor to 0. For example, Figure 4 The pressure detection module shown in FIG. resets the integration capacitor by closing the fifth switch. After the reset is completed, the fifth switch needs to be opened to subsequently transfer the charge on the detection capacitor to the integration capacitor in the integrator.

[0121] In the embodiment of the present application, the processor of the electronic device controls the on / off of the switch by outputting the voltage (IOVDD) of the output pin. For example, Figure 12 This is a control timing diagram of a fingerprint collection device provided by an embodiment of the present application, such as Figure 12 As shown, when a finger touches the fingerprint module, first, a high-level signal is output to control the first switch and the fifth switch to be closed to reset the integrating capacitor in the integrator, and after a first time interval, a high-level signal is used to close the third switch to connect the line between the reference voltage and the detection capacitor, and the detection capacitor is charged by the reference voltage.

[0122] Next, a low-level signal (i.e., voltage = 0) opens the third and fifth switches, and a high-level signal closes the fourth switch, connecting the detection capacitor to the integrating capacitor in the integrator and transferring the charge on the detection capacitor to the integrating capacitor. Next, the third and fourth switches are alternately closed, repeatedly transferring the charge on the detection capacitor to the integrating capacitor in the integrator. Ultimately, an electrical signal corresponding to the pressure is obtained based on the voltage signal output by the integrator.

[0123] (2) Based on Figure 5 The fingerprint acquisition device shown in obtains an electrical signal corresponding to the pressure: Specifically, charging the detection capacitor includes steps D1 to D2: Step D1: closing the first switch and the sixth switch, and opening the second switch and the seventh switch; Step D2: After the first time interval, the third switch is closed to connect the line between the reference voltage and the detection capacitor, and the detection capacitor is charged by the reference voltage.

[0124] For example, Figure 5 The pressure detection module of the fingerprint collection device shown in FIG. Figure 6 As shown, when a finger touches the fingerprint module, the first switch and the sixth switch are closed, and the second switch and the seventh switch are opened, so that the line between the detection capacitor of the pressure-sensitive device and the pressure detection module is connected, and the line between the detection capacitor of the pressure-sensitive device and the driving voltage module is connected; after a first time interval after connection, the third switch is closed to charge the detection capacitor through the reference voltage.

[0125] Specifically, transferring the charge on the detection capacitor to the integrator includes steps E1 to E3: Step E1: turning off the third switch and controlling the driving voltage module to generate a square wave signal to drive the second side electrode plate of the detection capacitor; Step E2: closing the fourth switch to connect the line between the detection capacitor and the integration capacitor in the integrator, and transferring the charge of the detection capacitor to the integration capacitor in the integrator; Step E3: Alternately closing the third switch and the fourth switch to transfer the charge on the detection capacitor to the integration capacitor in the integrator multiple times.

[0126] like Figure 5 As shown, after the detection capacitor is fully charged, the third switch is opened, and the driving voltage module is controlled to generate a square wave signal to drive the second-side electrode plate of the detection capacitor. At this time, the voltage of the first-side electrode plate of the detection capacitor is raised. The fourth switch is then closed to transfer the charge on the detection capacitor to the integrating capacitor in the integrator. Furthermore, by alternately closing the third and fourth switches, the charge on the detection capacitor is transferred to the integrating capacitor in the integrator multiple times. This multiple charge accumulation increases the pressure of the voltage signal, reduces the driving noise, and thus improves the accuracy and signal-to-noise ratio of the voltage signal.

[0127] In the embodiment of the present application, the processor of the electronic device controls the on / off of the switch by outputting the voltage (IOVDD) of the output pin. For example, Figure 13 This is a control timing diagram of another fingerprint collection device provided by an embodiment of the present application, such as Figure 13 As shown, when a finger touches the fingerprint module, first, the first switch and the sixth switch are closed, and the fifth switch is closed by a high-level signal to reset the integrating capacitor in the integrator; after the first time interval, the third switch is closed by a high-level signal to connect the line between the reference voltage and the detection capacitor, and the detection capacitor is charged by the reference voltage.

[0128] Afterwards, the third and fifth switches are disconnected by a low-level signal, and the fourth switch is controlled to close by a high-level signal to connect the line between the detection capacitor and the integrating capacitor in the integrator, transferring the charge on the detection capacitor to the integrating capacitor in the integrator. Next, the third and fourth switches are alternately closed to transfer the charge on the detection capacitor to the integrating capacitor in the integrator multiple times. In a preferred embodiment, after the third switch is disconnected, a short delay is added before closing the fourth switch to ensure that the two switches are not turned on at the same time. Finally, an electrical signal corresponding to the pressure is obtained based on the voltage signal output by the integrator.

[0129] In the embodiments of this application, a signal processing method is implemented based on a fingerprint acquisition device. This method determines the user's true intention based on the electrical signal corresponding to the pressure generated when the finger contacts the fingerprint module. Only when the fingerprint recognition behavior is actually unlocked is the fingerprint acquisition device used to capture the fingerprint image, avoiding unlocking fingerprint recognition due to accidental touch, thereby improving the user experience.

[0130] The present application also provides an electronic device, Figure 14 As shown, Figure 14 1 is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. The electronic device 1400 includes: a fingerprint collection device 1401 as described in an embodiment of the present application and a processor 1402. The processor 1402 generates a control signal to switch the state of a switch in the fingerprint collection device 1401 and perform fingerprint recognition based on a fingerprint image.

[0131] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0132] The embodiments of the present application are described with reference to the flowcharts and / or block diagrams of the fingerprint collection device, signal processing method, and electronic device according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device generate instructions for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0133] Although preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they become aware of the basic inventive concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0134] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or terminal device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or terminal device that includes the element.

[0135] The above is a detailed introduction to a fingerprint collection device, signal processing method and electronic device provided by the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, according to the idea of ​​the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present application.

Claims

1. A fingerprint collection device, characterized in that: include: The switch includes a first switch and / or a second switch, wherein the first switch is electrically connected between the pressure-sensitive device and the fingerprint module, and the second switch is electrically connected between the pressure-sensitive device and the processor of the electronic device, and the capacitance of the pressure-sensitive device changes with the pressure applied to the device; A fingerprint module is electrically connected to the processor of the electronic device. The fingerprint module includes a pressure detection module and a fingerprint acquisition module. The pressure detection module generates an electrical signal corresponding to the pressure when a finger contacts the fingerprint module. The fingerprint acquisition module is used to collect fingerprint images.

2. The fingerprint collection device according to claim 1, characterized in that: The pressure sensing device includes: a detection capacitor composed of a first side electrode plate and a second side electrode plate; The pressure detection module generates an electrical signal corresponding to the pressure when a finger contacts the fingerprint module, including: The charge change of the detection capacitor when the finger touches the fingerprint module; According to the change in charge, an electrical signal corresponding to the pressure is generated.

3. The fingerprint collection device according to claim 1, characterized in that: The first switch and / or the second switch switches states in response to a control signal generated by the processor; Wherein, in a case where the switch includes the first switch and the second switch, one of the first switch and the second switch is in a closed state, and the other is in an open state.

4. The fingerprint collection device according to claim 3, characterized in that: When a finger touches the surface of the fingerprint module, the first switch is in a closed state; In the default state and when fingerprint recognition fails, the second switch is in a closed state.

5. The fingerprint collection device according to claim 3, characterized in that: A first end of the first switch is connected to the first side electrode plate of the detection capacitor, and a second end of the first switch is connected to the input end of the pressure detection module; A first end of the second switch is connected to the first side electrode plate of the detection capacitor, and a second end of the second switch is connected to the input end of the processor; The second side electrode plate of the detection capacitor is grounded.

6. The fingerprint collection device according to claim 5, characterized in that: The pressure detection module includes: a third switch, a fourth switch, a fifth switch, an integrator, and a signal processing module; The second end of the first switch is connected to the input end of the pressure detection module, including: the second end of the first switch is respectively connected to the first end of the third switch and the first end of the fourth switch; The second end of the third switch is connected to the reference voltage; The fifth switch is connected in parallel with the integration capacitor of the integrator; The input end of the integrator is connected to the second end of the fourth switch, and the output end of the integrator is connected to the input end of the signal processing module.

7. The fingerprint collection device according to claim 1, characterized in that: In the case where the switch includes the first switch, the switch further includes a sixth switch, the fingerprint module further includes a driving voltage module, and the sixth switch is electrically connected between the driving voltage module and the pressure sensing device; In a case where the switch includes a second switch, the switch further includes a seventh switch, and the seventh switch is electrically connected between the pressure sensing device and a ground terminal.

8. The fingerprint collection device according to claim 7, characterized in that: The first switch, the second switch, the sixth switch, and the seventh switch switch states in response to a control signal generated by the processor; Among them, when the finger touches the surface of the fingerprint module, the first switch and the sixth switch are in a closed state; in the default state and when fingerprint recognition fails, the second switch and the seventh switch are in a closed state.

9. The fingerprint collection device according to claim 8, characterized in that: The pressure sensing device includes: a detection capacitor composed of a first side electrode plate and a second side electrode plate; A first end of the sixth switch is connected to the output end of the driving voltage module, and a second end of the sixth switch is connected to the second side electrode plate of the detection capacitor; A first end of the seventh switch is grounded, and a second end of the seventh switch is connected to the second side electrode plate of the detection capacitor.

10. The fingerprint collection device according to any one of claims 1 to 9, characterized in that: The fingerprint module further includes: a first multi-way switch and a signal processing module; The output end of the pressure detection module is connected to the first input end of the first multi-way switch, the output end of the fingerprint collection module is connected to the second input end of the first multi-way switch, and the output end of the first multi-way switch is connected to the input end of the signal processing module; The processor controls the first multi-way switch to achieve multiplexing of the signal processing module by the pressure detection module and the fingerprint acquisition module.

11. The fingerprint collection device according to any one of claims 1 to 9, characterized in that: The pressure-sensitive device is a power button of the electronic device.

12. The fingerprint collection device according to any one of claims 1 to 9, characterized in that: The pressure sensing device is arranged between the fingerprint module and the power button of the electronic device, or the power button is arranged between the fingerprint module and the pressure sensing device.

13. The fingerprint collection device according to any one of claims 1 to 9, characterized in that: The switch includes a first switch and a second switch, wherein an initial state of the first switch is an open state, and an initial state of the second switch is a closed state.

14. The fingerprint collection device according to any one of claims 1 to 9, characterized in that: Also includes: a first circuit board; The pressure sensing device and the fingerprint module are connected via a first circuit board; The switch is disposed on the first circuit board.

15. The fingerprint collection device according to claim 8, characterized in that: Also includes: a second circuit board and a third circuit board; The pressure sensing device is disposed on the second circuit board, and the fingerprint module is disposed on the third circuit board; The first switch and the second switch are disposed on the second circuit board or the third circuit board, and the sixth switch and the seventh switch are disposed on the second circuit board or the third circuit board.

16. A signal processing method, characterized in that: Applied to the fingerprint collection device according to any one of claims 1 to 15, the method comprises: When a finger is detected touching a corresponding fingerprint collection area of ​​the fingerprint module, an electrical signal corresponding to the pressure generated by the finger touching the fingerprint module is detected; A corresponding operation is performed according to a comparison result between the electrical signal and the threshold range.

17. The signal processing method according to claim 16, characterized in that: Detecting the electrical signal corresponding to the pressure generated by the fingerprint module, including: Measuring the charge change of the detection capacitor in the pressure sensing device; According to the change in charge, an electrical signal corresponding to the pressure is generated.

18. The signal processing method according to claim 16 or 17, characterized in that: Based on the comparison result of the electrical signal with the threshold range, different operations are performed, including: When the electrical signal is less than a minimum value of the threshold range, determining that the fingerprint collection area is accidentally touched; When the electrical signal is within the threshold range, collecting a fingerprint image by a fingerprint collection module; When the electrical signal is greater than a maximum value of the threshold range, it is determined that the function of the power button is turned on.

19. The signal processing method according to claim 17, wherein: Generating an electrical signal corresponding to the pressure according to the capacitance change value, including: charging the detection capacitor until the voltage of the detection capacitor is equal to the target voltage; Transferring the charge on the detection capacitor to an integrating capacitor in an integrator, so that the integrator outputs a voltage signal according to the charge transferred to the integrating capacitor; The voltage signal output by the integrator is processed by a signal processing module to obtain an electrical signal corresponding to the pressure.

20. An electronic device, characterized in that: include: The fingerprint collection device and processor according to any one of claims 1 to 15, wherein the processor generates a control signal to switch the state of a switch in the fingerprint collection device and perform fingerprint recognition based on the fingerprint image.

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