Power amplifier and fingerprint processing assembly, electronic device

Abstract

The application discloses a power amplifier and a fingerprint processing assembly, and electronic equipment, and belongs to the technical field of communication. The power amplifier and the fingerprint processing assembly comprise an audio control circuit, a fingerprint control circuit, a loudspeaker connected with the audio control circuit, and a fingerprint acquisition circuit connected with the fingerprint control circuit. The audio control circuit or the fingerprint control circuit comprises a boosting module, and the boosting module is used for boosting a signal input to a driving end of the fingerprint acquisition circuit and a signal input to the loudspeaker.

Description

Technical Field

[0001] This application belongs to the field of communication technology, specifically relating to a power amplifier and fingerprint processing component, and an electronic device. Background Technology

[0002] With the continuous development of science and technology, fingerprint recognition technology has gradually been applied to people's daily lives. Fingerprint recognition technology can identify individuals by comparing the detailed feature points of different fingerprints, thereby achieving the function of identity verification.

[0003] However, existing fingerprint recognition solutions are designed and deployed independently, while electronic devices often need to achieve diverse functions, requiring the internal deployment of various functional components such as cameras, antennas, and speakers. Thus, the independent design and deployment of fingerprint recognition solutions consumes internal space and increases manufacturing costs. Summary of the Invention

[0004] The purpose of this application is to provide a power amplifier and fingerprint processing component, and an electronic device, which can solve the space occupation problem of existing fingerprint recognition implementation schemes.

[0005] In a first aspect, embodiments of this application provide a power amplifier and fingerprint processing component, including:

[0006] An audio control circuit, a fingerprint control circuit, a speaker connected to the audio control circuit, and a fingerprint acquisition circuit connected to the fingerprint control circuit;

[0007] The audio control circuit or the fingerprint control circuit includes a boost module, which is used to boost the signal input to the drive terminal of the fingerprint acquisition circuit and the signal input to the speaker.

[0008] Secondly, embodiments of this application provide an electronic device, including: a central processing unit, and the power amplifier and fingerprint processing component described in the first aspect; wherein,

[0009] The central processing unit is connected to the power amplifier and fingerprint processing component.

[0010] In the power amplifier and fingerprint processing components of this application embodiment, a boost module capable of simultaneously boosting the signal input to the driving end of the fingerprint acquisition circuit and the signal input to the speaker is located in the audio control circuit connected to the speaker or the fingerprint control circuit connected to the fingerprint acquisition circuit. This enables the reuse of some components in the electronic device, avoids the space-consuming problem of independently designing a fingerprint recognition component, and saves costs. Attached Figure Description

[0011] Figure 1 This is one of the application diagrams of the power amplifier and fingerprint processing components according to an embodiment of this application;

[0012] Figure 2 This is a second schematic diagram illustrating the application of the power amplifier and fingerprint processing components in an embodiment of this application;

[0013] Figure 3 This is the third schematic diagram illustrating the application of the power amplifier and fingerprint processing components in this application embodiment;

[0014] Figure 4 This is the fourth schematic diagram illustrating the application of the power amplifier and fingerprint processing components in this application. Detailed Implementation

[0015] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0016] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0017] In this embodiment, the following needs to be understood:

[0018] I. Ultrasonic fingerprint recognition technology

[0019] Ultrasonic fingerprint recognition operates in two phases: ultrasonic transmission and reception. During the transmission phase, the receiving electrode is at a fixed voltage level (e.g., GND), while the driving electrode sends a high-voltage driving pulse at an ultrasonic frequency (on the order of MHz). During this phase, the piezoelectric material is excited by the voltage, generating an inverse piezoelectric effect and vibrating rhythmically, thus emitting ultrasonic waves. After transmission, the ultrasonic wave reception phase begins. At this stage, the driving electrode is at a fixed voltage level, and the receiving electrode is connected to the detection circuit via a switch. Simultaneously, the ultrasonic wave contacts the finger and is reflected back. The piezoelectric material is affected by the reflected ultrasonic wave, generating an electrical signal that is detected by the detection circuit of the ultrasonic receiving module. The ultrasonic waves reflected from the fingerprint's valleys and ridges have different energies, resulting in different electrical signal intensities and thus different detected voltages, allowing the acquisition of the corresponding fingerprint image.

[0020] II. Working principle of Class D amplifiers

[0021] The input audio signal has a frequency of 20–20 kHz, which is within the range audible to the human ear. High-frequency triangular waves are ultrasonic frequencies, typically in the MHz range, and are inaudible to the human ear. Comparing the ultrasonic triangular wave with the low-frequency audio signal yields a square wave with the same frequency as the high-frequency triangular wave and an amplitude of V1, which is generally lower. This square wave is then converted into a square wave OUTP with the same frequency and duty cycle and a high amplitude of V2, typically n times V1. Simultaneously, an inverted output can produce a square wave OUTN with the same frequency and a negative amplitude of -V2. OUTP and OUTN are output to the speaker. The speaker circuit itself acts as a low-pass filter, resulting in a waveform with the same frequency as the input audio signal but a higher amplitude. As the input audio signal changes, the duty cycle of the Class D amplifier's output square wave also changes, thus achieving output following input changes and ultimately amplifying the sound.

[0022] The power amplifier, fingerprint processing component, and electronic device provided in this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios. The shape and size of the printed resistors in the figures are for illustrative purposes only.

[0023] like Figure 1-4 As shown, an embodiment of this application provides a power amplifier and fingerprint processing component, comprising:

[0024] An audio control circuit, a fingerprint control circuit, a speaker connected to the audio control circuit, and a fingerprint acquisition circuit connected to the fingerprint control circuit;

[0025] The audio control circuit or the fingerprint control circuit includes a boost module, which is used to boost the signal input to the drive terminal of the fingerprint acquisition circuit and the signal input to the speaker.

[0026] Thus, in the power amplifier and fingerprint processing components of this application embodiment, the boost module, which can simultaneously boost the signal input to the driving end of the fingerprint acquisition circuit and the signal input to the speaker, is located in the audio control circuit connected to the speaker or the fingerprint control circuit connected to the fingerprint acquisition circuit. This enables the reuse of some components in the electronic device, avoids the problem of space occupation caused by independently designing the fingerprint recognition component, and saves costs.

[0027] In this embodiment, the audio control circuit is used for audio power amplifier processing, and the fingerprint control circuit is used for fingerprint recognition processing.

[0028] Optionally, the fingerprint acquisition circuit includes:

[0029] The components include a driving electrode, a piezoelectric material, at least one selector switch, and a receiving electrode.

[0030] The driving electrode, the piezoelectric material, and the receiving electrode are stacked in sequence, and the projection position is located in the first area of ​​the display panel.

[0031] The driving electrode is the driving end of the fingerprint acquisition circuit.

[0032] Optionally, when the at least one selection switch includes a first switch and a second switch, the fixed end of the first switch is connected to a piezoelectric material, the first switching end of the first switch is connected to a driving electrode, the second switching end of the first switch is grounded, the fixed end of the second switch is connected to a piezoelectric material, the first switching end of the second switch is connected to a receiving electrode, and the second switching end of the second switch is grounded or connected to the output terminal of the audio control circuit; or...

[0033] In the case where the at least one selection switch includes a third switch, the fixed end of the third switch is connected to a piezoelectric material, the first switching end of the third switch is connected to a receiving electrode, the second switching end of the third switch is grounded, the piezoelectric material is connected to the driving electrode, and the driving electrode is connected to the output end of the fingerprint control circuit.

[0034] Therefore, the power amplifier and fingerprint processing component of this application embodiment, the fingerprint acquisition circuit can ensure that the signal input to the driving end of the fingerprint acquisition circuit and the signal input to the speaker are boosted through the above circuit connection structure.

[0035] Optionally, if the first switching terminal of the first switch is connected to the driving electrode, the audio control circuit includes the boost module.

[0036] As one implementation method, the fingerprint acquisition circuit can be as follows: Figure 1 As shown, the system includes a first switch (i.e., switch 1) and a second switch (i.e., switch 2). Switch 1 has a fixed end connected to a piezoelectric material, a first switching end connected to a driving electrode, and a second switching end grounded. Switch 2 has a fixed end connected to a piezoelectric material, a first switching end connected to a receiving electrode, and a second switching end grounded. The ultrasonic receiving module controls the switching of switches 1 and 2.

[0037] As one implementation method, the fingerprint acquisition circuit can be as follows: Figure 2 , Figure 3As shown, the system includes a first switch (switch 1) and a second switch (switch 2). Switch 1 has a fixed end connected to a piezoelectric material, a first switching end connected to a driving electrode, and a second switching end grounded. Switch 2 has a fixed end connected to a piezoelectric material, a first switching end connected to a receiving electrode, and a second switching end connected to the output of an audio control circuit. The ultrasonic receiving module controls the switching of switches 1 and 2.

[0038] Optionally, when the piezoelectric material is connected to the driving electrode, the fingerprint control circuit includes the boost module, and the boost module is also connected to the output module of the audio control circuit.

[0039] As one implementation method, the fingerprint acquisition circuit can also be as follows: Figure 4 As shown, the circuit includes a third switch (i.e., switch 3). The fixed end of switch 3 is connected to a piezoelectric material, one switching end is connected to a receiving electrode, and the second switching end is grounded. The piezoelectric material is connected to a driving electrode, which is connected to the output end of the fingerprint control circuit, i.e., the output end of the ultrasonic output module. The ultrasonic output module controls the switching of switch 3.

[0040] Optionally, the audio control circuit includes an output module and a boost module connected to the output module; wherein the output terminal of the output module is connected to the speaker and the fingerprint acquisition circuit.

[0041] The fingerprint control circuit includes an ultrasonic receiving module, the input of which is connected to the fingerprint acquisition circuit.

[0042] In other words, if the aforementioned boost module is located within the audio control circuit, such as... Figure 1-4 As shown, the output signal of the audio control circuit is output from the output terminal of the output module to the speaker and the fingerprint acquisition circuit. The fingerprint control circuit only needs to be equipped with an ultrasonic receiving module, the input terminal of which is connected to the fingerprint acquisition circuit.

[0043] Optionally, the output terminal of the output module includes a first output and a second output;

[0044] Wherein, the first output is connected to the first input of the speaker and the driving electrode of the fingerprint acquisition circuit, and the second output is connected to the second input of the speaker; or,

[0045] The first output is connected to the first input of the speaker and the driving electrode of the fingerprint acquisition circuit, respectively, and the second output is connected to the second input of the speaker and the second switching terminal of the second switch of the fingerprint acquisition circuit.

[0046] Thus, the output module of the audio control circuit can be implemented in one way, such as... Figure 1As shown, only the first output is connected to the drive electrode of the fingerprint acquisition circuit, ensuring that the fingerprint acquisition circuit can be driven by the audio control circuit; another implementation can be as follows: Figure 2 As shown, while the first output is connected to the driving electrode of the fingerprint acquisition circuit, the second output is also connected to the second switching terminal of the second switch of the fingerprint acquisition circuit, which can provide higher ultrasonic emission energy while ensuring that the fingerprint acquisition circuit can be driven by the audio control circuit.

[0047] Optionally, the fingerprint control circuit includes an ultrasonic output module connected to the boost module and an ultrasonic receiving module; wherein the output terminal of the output module is connected to the speaker, or the output terminal of the output module is connected to the speaker and the fingerprint acquisition circuit.

[0048] Here, as Figure 4 As shown, the output module of the audio control circuit and the ultrasonic receiving module of the fingerprint control circuit are connected to the same boost module. The output terminal of the output module is connected to the speaker, or the output terminal of the output module is connected to the speaker and the fingerprint acquisition circuit, so that the audio control circuit and the fingerprint control circuit can complete audio processing and fingerprint recognition processing while reusing the boost module.

[0049] Specifically, when the output module of the audio control circuit and the ultrasonic receiving module of the fingerprint control circuit are connected to the same boost module, the fingerprint acquisition circuit can not only provide... Figure 4 The fingerprint acquisition circuit shown includes a third switch, but it can also be a fingerprint acquisition circuit including a first switch (i.e., switch 1) and a second switch (i.e., switch 2). In this fingerprint acquisition circuit, the fixed end of switch 1 is connected to a piezoelectric material, the first switching end is connected to a driving electrode (i.e., the first input of the speaker), and the second switching end is grounded; while the fixed end of switch 2 is connected to a piezoelectric material, the first switching end is connected to a receiving electrode, and the second switching end is grounded or connected to the second input of the speaker.

[0050] Optionally, the audio control circuit includes a digital audio interface module, which is connected to the central processing unit.

[0051] Of course, the audio control circuit may also exclude the digital audio interface module and include a preprocessing module. However, in this case, when the audio control circuit is applied to electronic devices, the preprocessing module needs to be connected to the central processing unit (CPU) via an audio codec (CODEC), such as... Figure 1 As shown.

[0052] It should be noted that the audio control circuit is used to achieve audio processing, such as... Figure 1-4 As shown, it may also include a Class D amplification module, a mode control module, etc. The fingerprint control circuit is used to achieve fingerprint recognition, such as... Figure 1-4As shown, it may also include a Serial Peripheral Interface (SPI), a microprocessor, and on-chip memory, etc.

[0053] It should also be noted that, in this embodiment, as Figures 1-4 As shown, the microprocessor and on-chip memory are used for controlling the ultrasonic wave transmission and reception, as well as for preliminary processing of the ultrasonic fingerprint information; the boost module is used to generate high voltage to produce ultrasonic waves with sufficient energy (the boost module generally also needs to be used with an external capacitor or inductor to achieve voltage boost, which is not shown in the figure); the ultrasonic transmission module is used to output a high-voltage pulse of an ultrasonic frequency at a specific frequency to drive the piezoelectric material to produce the inverse piezoelectric effect and vibrate regularly, thereby emitting ultrasonic waves outward; the ultrasonic receiving module is used to detect the voltage obtained by the piezoelectric effect of the piezoelectric material through the ultrasonic wave reflected from the finger, and after conversion by an ADC, a detailed fingerprint image can be obtained.

[0054] The communication between the CPU, microprocessor, and on-chip memory mainly uses the SPI interface, and the control signals include interrupts and resets.

[0055] Among them, the Class D amplifier module is an analog input.

[0056] The CPU and audio CODEC communicate via IIS to transmit audio information, along with other control signals such as reset and interrupt signals. The analog input to the audio amplifier comes from the audio CODEC, and after amplification, it drives external speakers. The control signals for the audio amplifier come from the CPU, typically using different pulse counts to control its operation in different modes, such as different amplification factors and power levels. The communication interfaces described above are not limited to SPI / IIS; other interfaces capable of achieving the same functionality, such as PCM and Soundwire, can also be used, but will not be listed in detail here.

[0057] The specific applications of the power amplifier and fingerprint processing components in the embodiments of this application are described below:

[0058] Application Example 1, such as Figure 1As shown, an electronic device is configured with an audio control circuit, a fingerprint control circuit, a speaker, a fingerprint acquisition circuit, and a power amplifier and fingerprint processing component. The audio control circuit includes a preprocessing module, a Class D amplification module, a mode control module, an output module, and a boost module, with connections between these modules as shown. The preprocessing module is connected to the CPU via a CODEC, and the mode control module is directly connected to the CPU. The fingerprint control circuit includes a microprocessor, on-chip memory, SPI, and an ultrasonic receiver module. The microprocessor, on-chip memory, and SPI are connected to the CPU. A power management integrated circuit (PMIC) provides power to the fingerprint control circuit.

[0059] exist Figure 1 In the fingerprint acquisition circuit, the first switch (switch 1) has a fixed end connected to a piezoelectric material, a first switching end connected to a driving electrode, and a second switching end grounded; the second switch (switch 2) has a fixed end connected to a piezoelectric material, a first switching end connected to a receiving electrode, and a second switching end grounded. The first output (OUTP) of the output module is connected to the driving electrode of the fingerprint acquisition circuit to input the output signal of the audio control circuit to the driving end of the fingerprint acquisition circuit.

[0060] Because the audio control circuit includes a boost module, it can increase the voltage of the output signal by n times (n is a number greater than 1); the frequency of its output signal (such as a square wave signal) is also on the order of MHz, which is ultrasonic.

[0061] Therefore, in a normal scenario where the speaker is playing sound, switch 1 is grounded, the fingerprint collection circuit does not work, and the speaker plays sound normally.

[0062] During the ultrasonic fingerprint emission phase, the audio amplifier input remains at a fixed level (e.g., 0V), and the output will be a high-frequency voltage pulse with a duty cycle of 50%, which becomes 0V after passing through a low-pass filter, so the speaker does not work. At this time, switch 1 is connected to OUTP, and switch 2 is connected to a fixed level (e.g., GND). Therefore, the piezoelectric material will generate an inverse piezoelectric effect and vibrate regularly under the high-frequency voltage pulse with a voltage of V2 at OUTP, thereby emitting ultrasonic waves.

[0063] In the ultrasonic fingerprint receiving stage, switch 1 is connected to a fixed voltage level (GND in this example diagram), and switch 2 is connected to the ADC detection circuit of the ultrasonic receiving module. During this stage, the ultrasonic waves contact the finger and are reflected back. The piezoelectric material is affected by the reflected ultrasonic waves, generating an electrical signal that is detected by the ADC detection circuit of the ultrasonic receiving module. The ultrasonic waves reflected from the fingerprint valleys and ridges have different energies, resulting in different electrical signal intensities and thus different detected voltages, thereby obtaining the corresponding fingerprint image.

[0064] so, Figure 1 The amplifier and fingerprint processing components shown have an audio control circuit whose output signal can be used as the TX driver for fingerprint acquisition. This eliminates the need to deploy a boost module and an ultrasonic transmitter module in the fingerprint control circuit, resulting in a simpler structure, reduced cost, and less space requirements for the fingerprint control circuit.

[0065] Application Example 2, such as Figure 2 As shown, an amplifier and fingerprint processing component, including an audio control circuit, a fingerprint control circuit, a speaker, and a fingerprint acquisition circuit, are configured in an electronic device. The audio control circuit includes a preprocessing module, a Class D amplification module, a mode control module, an output module, and a boost module, with connections between the modules as shown. The preprocessing module is connected to the CPU via a CODEC, and the mode control module is directly connected to the CPU. The fingerprint control circuit includes a microprocessor, on-chip memory, SPI, and an ultrasonic receiver module. The microprocessor, on-chip memory, and SPI are connected to the CPU. The PMIC provides power to the fingerprint control circuit.

[0066] exist Figure 2 In the fingerprint acquisition circuit, the first switch (switch 1) has its fixed end connected to a piezoelectric material, its first switching end connected to a driving electrode, and its second switching end grounded. The second switch (switch 2) has its fixed end connected to a piezoelectric material, its first switching end connected to a receiving electrode, and its second switching end connected to an audio control circuit. The first output (OUTP) of the output module is connected to the driving electrode of the fingerprint acquisition circuit to input the output signal of the audio control circuit to the driving end of the fingerprint acquisition circuit. The second output (OUTN) of the output module is connected to the second switching end of switch 2 in the fingerprint acquisition circuit.

[0067] In a normal scenario where the speaker is playing sound, switch 1 is grounded and switch 2 is connected to the ultrasonic receiving module. However, the fingerprint acquisition circuit is not working, the ultrasonic receiving module is not working, and the speaker is playing sound normally.

[0068] During the ultrasonic fingerprint emission phase, the audio amplifier input remains at a fixed level (e.g., 0V). The output will then be a high-frequency voltage pulse with a 50% duty cycle, consisting of positive and negative voltages. After passing through a low-pass filter, this becomes 0V, so the speaker does not operate. At this time, switch 1 is connected to OUTP, and switch 2 is connected to OUTN. Because OUTP and OUTN are differential voltages (positive and negative), the piezoelectric material will exhibit an inverse piezoelectric effect and vibrate regularly under the 2V / 2 high-frequency voltage pulse between OUTP and OUTN, thus emitting ultrasonic waves. Since the amplitude of the high-voltage pulse applied to the piezoelectric material is doubled, the energy of the emitted ultrasonic waves is also doubled.

[0069] In the ultrasonic fingerprint receiving stage, similar to application example one, switch 1 is connected to a fixed voltage level (GND in this example diagram), and switch 2 is connected to the ADC detection circuit of the ultrasonic receiving module. In this stage, after the ultrasonic waves come into contact with the finger, they are reflected back. The piezoelectric material is affected by the reflected ultrasonic waves, generating an electrical signal that is detected by the detection circuit of the ultrasonic receiving module. The ultrasonic waves reflected from the fingerprint valleys and ridges have different energies, resulting in different electrical signal intensities and thus different detected voltages, thereby obtaining the corresponding fingerprint image.

[0070] so, Figure 2 The power amplifier and fingerprint processing components shown not only allow the output signal of the audio control circuit to be used as the TX driver for fingerprint acquisition, as illustrated in Example 1, eliminating the need to deploy a boost module and an ultrasonic emission module in the fingerprint control circuit, thus simplifying the structure of the fingerprint control circuit, saving costs, and reducing space occupation; moreover, since the amplitude of the high-voltage pulse applied to the piezoelectric material is doubled, the energy of the ultrasonic emission is also doubled, enabling the acquisition of fingerprint images of better quality.

[0071] Application Example 3, such as Figure 3 As shown, an amplifier and fingerprint processing component, including an audio control circuit, a fingerprint control circuit, a speaker, and a fingerprint acquisition circuit, are configured in an electronic device. The audio control circuit includes a digital audio interface module, a Class D amplifier module, a mode control module, an output module, and a boost module; the connections between these modules are shown in the figure. The audio signal output from the CPU's IIS interface is digital information; the digital audio interface module can convert this audio signal using a DAC to obtain an analog audio signal. The CPU and the audio control circuit communicate via an I2C interface. The fingerprint control circuit includes a microprocessor, on-chip memory, SPI, and an ultrasonic receiver module; the microprocessor, on-chip memory, and SPI are connected to the CPU. The PMIC provides power to the fingerprint control circuit.

[0072] exist Figure 3 In the fingerprint acquisition circuit, the first switch (switch 1) has its fixed end connected to a piezoelectric material, its first switching end connected to a driving electrode, and its second switching end grounded. The second switch (switch 2) has its fixed end connected to a piezoelectric material, its first switching end connected to a receiving electrode, and its second switching end connected to an audio control circuit. The first output (OUTP) of the output module is connected to the driving electrode of the fingerprint acquisition circuit to input the output signal of the audio control circuit to the driving end of the fingerprint acquisition circuit. The second output (OUTN) of the output module is connected to the second switching end of switch 2 in the fingerprint acquisition circuit.

[0073] In a normal scenario where the speaker is playing sound, switch 1 is grounded and switch 2 is connected to the ultrasonic receiving module. However, the fingerprint acquisition circuit is not working, the ultrasonic receiving module is not working, and the speaker is playing sound normally.

[0074] During the ultrasonic fingerprint emission phase, the input of the audio amplifier can be disregarded. The CPU directly configures the digital audio amplifier via I2C to output a high-frequency positive and negative voltage pulse with a 50% duty cycle. After passing through a low-pass filter, this becomes 0V, so the speaker does not work. At this time, switch 1 is connected to OUTP, and switch 2 is connected to OUTN. The piezoelectric material will generate an inverse piezoelectric effect and vibrate regularly under the high-frequency voltage pulse with a voltage amplitude of 2V² between OUTP and OUTN, thereby emitting ultrasonic waves.

[0075] The ultrasonic fingerprint reception stage is the same as in Example 1 and Example 2, and will not be repeated here.

[0076] In this way, the output signal of the audio control circuit can be used as the TX driver for fingerprint acquisition, eliminating the need to deploy a boost module and an ultrasonic emission module in the fingerprint control circuit. This simplifies the structure of the fingerprint control circuit, saves costs, and reduces space occupation. Moreover, since the amplitude of the high-voltage pulse applied to the piezoelectric material is doubled, the energy of the ultrasonic emission is also doubled, resulting in a higher quality fingerprint image. Furthermore, there is no need to add a CODEC between the audio control circuit and the CPU.

[0077] Of course, if the quality requirements for fingerprint images are relatively low, the connection between the fingerprint acquisition circuit and the audio control circuit and the fingerprint control circuit can also be adopted. Figure 1 As shown.

[0078] Application Example 4, such as Figure 4 As shown, an amplifier and fingerprint processing component, including an audio control circuit, a fingerprint control circuit, a speaker, and a fingerprint acquisition circuit, are configured in an electronic device. The audio control circuit includes a digital audio interface module, a Class D amplifier module, and an output module. The fingerprint control circuit includes a boost module, a microprocessor, on-chip memory, SPI, an ultrasonic receiver module, and an ultrasonic output module. The connections between these modules are shown in the figure. The boost module is also connected to the output module of the audio control circuit. The audio signal output from the CPU's IIS interface is digital information; the digital audio interface module can convert this audio signal using a DAC to obtain an analog audio signal. In this case, fingerprint recognition processing and audio processing share the boost module and the SPI interface.

[0079] This power amplifier and fingerprint processing component can perform audio processing and fingerprint recognition simultaneously. For electronic devices that require both fingerprints and audio, such as fingerprint locks, it not only saves costs but also simplifies the circuit structure.

[0080] Of course, for electronic devices that do not require audio processing and fingerprint recognition processing, the fingerprint acquisition circuit of this power amplifier and fingerprint processing component can also be used. Figure 1-4The fingerprint acquisition circuit shown is driven by the audio processing output module, eliminating the need for an ultrasonic output module. The specific connection details are not described here, which can further reduce costs and space requirements.

[0081] This application provides an electronic device, including:

[0082] The central processing unit, and the power amplifier and fingerprint processing components as described above; wherein,

[0083] The central processing unit is connected to the power amplifier and fingerprint processing component.

[0084] It should be noted that the electronic device uses the aforementioned power amplifier and fingerprint processing components. The implementation method of connecting the aforementioned power amplifier and fingerprint processing components is applicable to the electronic device and can achieve the same technical effect.

[0085] The electronic device in this application embodiment can be a terminal or other devices besides a terminal. For example, the electronic device can be a mobile phone, tablet computer, laptop computer, handheld computer, in-vehicle electronic device, mobile internet device (MID), augmented reality (AR) / virtual reality (VR) device, robot, wearable device, ultra-mobile personal computer (UMPC), netbook, or personal digital assistant (PDA), etc. It can also be a server, network attached storage (NAS), personal computer (PC), television (TV), ATM, or self-service machine, etc. This application embodiment does not specifically limit the scope.

[0086] The electronic device in this application embodiment may have an operating system. This operating system may be Android, iOS, or other possible operating systems.

[0087] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0088] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0089] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A power amplifier and fingerprint processing component, characterized in that, include: An audio control circuit, a fingerprint control circuit, a speaker connected to the audio control circuit, and a fingerprint acquisition circuit connected to the fingerprint control circuit; The audio control circuit or the fingerprint control circuit includes a boost module, which is used to boost the signal input to the drive terminal of the fingerprint acquisition circuit and the signal input to the speaker. The fingerprint acquisition circuit includes: The components include a driving electrode, a piezoelectric material, at least one selector switch, and a receiving electrode. The driving electrode, the piezoelectric material, and the receiving electrode are stacked sequentially, and the projection position is located in the first area of ​​the display panel. In the case where the at least one selection switch includes a first switch and a second switch, the fixed end of the first switch is connected to a piezoelectric material, the first switching end of the first switch is connected to a driving electrode, the second switching end of the first switch is grounded, the fixed end of the second switch is connected to a piezoelectric material, the first switching end of the second switch is connected to a receiving electrode, and the second switching end of the second switch is grounded or connected to the output terminal of the audio control circuit; or... In the case where the at least one selection switch includes a third switch, the fixed end of the third switch is connected to a piezoelectric material, the first switching end of the third switch is connected to a receiving electrode, the second switching end of the third switch is grounded, the piezoelectric material is connected to the driving electrode, and the driving electrode is connected to the output end of the fingerprint control circuit.

2. The power amplifier and fingerprint processing component according to claim 1, characterized in that, When the first switching terminal of the first switch is connected to the driving electrode, the audio control circuit includes the boost module.

3. The power amplifier and fingerprint processing component according to claim 1, characterized in that, When the piezoelectric material is connected to the driving electrode, the fingerprint control circuit includes the boost module, and the boost module is also connected to the output module of the audio control circuit.

4. The power amplifier and fingerprint processing component according to claim 2, characterized in that, The audio control circuit includes an output module and a boost module connected to the output module; wherein the output terminal of the output module is connected to the speaker and the fingerprint acquisition circuit. The fingerprint control circuit includes an ultrasonic receiving module, the input of which is connected to the fingerprint acquisition circuit.

5. The power amplifier and fingerprint processing component according to claim 4, characterized in that, The output module includes a first output and a second output. Wherein, the first output is connected to the first input of the speaker and the driving electrode of the fingerprint acquisition circuit, and the second output is connected to the second input of the speaker; or, The first output is connected to the first input of the speaker and the driving electrode of the fingerprint acquisition circuit, respectively, and the second output is connected to the second input of the speaker and the second switching terminal of the second switch of the fingerprint acquisition circuit.

6. The power amplifier and fingerprint processing component according to claim 3, characterized in that, The fingerprint control circuit includes an ultrasonic output module connected to the boost module and an ultrasonic receiving module; wherein, the output terminal of the output module is connected to the speaker, or the output terminal of the output module is connected to the speaker and the fingerprint acquisition circuit.

7. The power amplifier and fingerprint processing component according to claim 1, characterized in that, The audio control circuit includes a digital audio interface module, which is connected to the central processing unit.

8. An electronic device, characterized in that, include: A central processing unit, and a power amplifier and fingerprint processing component as described in any one of claims 1 to 7; wherein, The central processing unit is connected to the power amplifier and fingerprint processing component.

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