阅读说明：本技术 超声波压力检测模组及其检测方法、电子设备 (Ultrasonic pressure detection module, detection method thereof and electronic equipment ) 是由 许春东 于 2020-04-22 设计创作，主要内容包括：本发明提供一种超声波压力检测模组,其包括用于供手指触控按压的盖板、设置于盖板下方的超声波传感器,及电连接于超声波传感器的处理器；超声波传感器用于向手指发射频率低于预设频率的第一超声波信号,并接收经手指与盖板的接触部分反射的第二超声波信号；处理器用于控制超声波传感器发射第一超声波信号,并获取第二超声波信号以根据第二超声波信号的强度得出手指按压盖板的压力值；其中,第二超声波信号的强度随手指与盖板的接触面积的变化而变化,二者呈正比；手指与盖板的接触面积随手指按压盖板的压力值的变化而变化,二者也呈正比。本发明还提一种所述超声波压力检测模组的检测方法及包括所述超声波压力检测模组的电子设备。(The invention provides an ultrasonic pressure detection module, which comprises a cover plate, an ultrasonic sensor and a processor, wherein the cover plate is used for being pressed by fingers in a touch manner; the ultrasonic sensor is used for transmitting a first ultrasonic signal with frequency lower than the preset frequency to the finger and receiving a second ultrasonic signal reflected by the contact part of the finger and the cover plate; the processor is used for controlling the ultrasonic sensor to emit a first ultrasonic signal and acquiring a second ultrasonic signal so as to obtain a pressure value of the finger pressing the cover plate according to the intensity of the second ultrasonic signal; the intensity of the second ultrasonic signal changes along with the change of the contact area of the finger and the cover plate, and the intensity of the second ultrasonic signal is in direct proportion to the contact area of the finger and the cover plate; the contact area of the finger and the cover plate changes along with the change of the pressure value of the finger pressing the cover plate, and the contact area of the finger and the cover plate is in direct proportion. The invention also provides a detection method of the ultrasonic pressure detection module and electronic equipment comprising the ultrasonic pressure detection module.)

1. The utility model provides an ultrasonic wave pressure detection module for pressure detection is pressed in touch-control of finger, its characterized in that includes:

the cover plate is used for being pressed by fingers in a touch manner;

the ultrasonic sensor is arranged below the cover plate and used for transmitting a first ultrasonic signal with the frequency lower than the preset frequency to a finger and receiving a second ultrasonic signal reflected by a contact part of the finger and the cover plate; and

the processor is electrically connected with the ultrasonic sensor and used for controlling the ultrasonic sensor to emit the first ultrasonic signal and acquiring the second ultrasonic signal so as to obtain a pressure value of pressing the cover plate by a finger according to the intensity of the second ultrasonic signal;

the intensity of the second ultrasonic signal changes along with the change of the contact area of the finger and the cover plate, and the intensity of the second ultrasonic signal is in direct proportion to the contact area of the finger and the cover plate; the contact area of the finger and the cover plate changes along with the change of the pressure value of the finger pressing the cover plate, and the contact area of the finger and the cover plate is in direct proportion.

2. The ultrasonic pressure detection module of claim 1, wherein the predetermined frequency is in a range of 1MHz to 2 MHz.

3. The ultrasonic pressure detection module of claim 1, wherein the intensity of the second ultrasonic signal and the contact area between the finger and the cover plate satisfy a corresponding relationship:

the contact area of the finger and the cover plate and the pressure value of the finger pressing the cover plate meet the corresponding relation:

A＝S(f,β)，

wherein, the V_iIs the intensity of the second ultrasonic signal, the V₀Is the intensity of the first ultrasonic signal, A is the contact area of the finger with the cover plate, and Z₁、Z₂The acoustic impedances of the finger and the cover plate are respectively, the S is a calculation function of A, the f is a pressure value of the cover plate pressed by the finger, and the β is a characteristic parameter of the finger.

4. The ultrasonic pressure detection module of claim 1, further comprising a fingerprint identification element electrically connected to the processor for collecting fingerprint information of a finger and converting the fingerprint information into an electrical signal when the finger presses the cover plate, wherein the processor identifies the fingerprint information according to the electrical signal;

when the fingerprint information is identified to be matched fingerprint information, the processor controls the ultrasonic pressure sensor to transmit the first ultrasonic signal to the finger so as to detect the pressure value of the cover plate pressed by the finger.

5. The ultrasonic pressure detection module of claim 4, wherein the fingerprint identification element is disposed between the cover plate and the ultrasonic sensor.

6. An ultrasonic pressure detection method for the ultrasonic pressure detection module according to claim 1, comprising:

when a finger presses the cover plate, the ultrasonic sensor is controlled to transmit a first ultrasonic signal with frequency lower than preset frequency to the finger;

receiving a second ultrasonic signal of the first ultrasonic signal reflected by a contact part of a finger and the cover plate; and

and obtaining the pressure value of the finger pressing the cover plate according to the strength of the second ultrasonic signal.

7. The ultrasonic pressure detection method of claim 6, wherein the preset frequency is in a range of 1MHz to 2 MHz.

8. The ultrasonic pressure detection method according to claim 6, wherein the intensity of the second ultrasonic signal and the contact area between the finger and the cover plate satisfy a correspondence relationship:

the contact area of the finger and the cover plate and the pressure value of the finger pressing the cover plate meet the corresponding relation:

A＝S(f,β)，

wherein, the V_iIs the intensity of the second ultrasonic signal, the V₀Is the intensity of the first ultrasonic signal, A is the contact area of the finger with the cover plate, and Z₁、Z₂The acoustic impedances of the finger and the cover plate are respectively, the S is a calculation function of A, the f is a pressure value of the cover plate pressed by the finger, and the β is a characteristic parameter of the finger.

9. The ultrasonic pressure detection method of claim 6, wherein the ultrasonic pressure detection module further comprises a fingerprint recognition element electrically connected to the processor, and the step of controlling the ultrasonic sensor to emit the first ultrasonic signal having a frequency lower than a preset frequency to the finger when the finger presses the cover plate comprises:

when a finger presses the cover plate, the fingerprint identification element is controlled to collect fingerprint information of the finger and convert the fingerprint information into an electric signal;

and identifying the fingerprint information according to the electric signal, and controlling the ultrasonic pressure sensor to transmit the first ultrasonic signal to the finger when the fingerprint information is identified as matched fingerprint information.

10. An electronic device, comprising the ultrasonic pressure detection module according to any one of claims 1 to 5, wherein the ultrasonic pressure detection module is disposed on a front surface, a back surface or a side surface of the electronic device.

Technical Field

The invention belongs to the technical field of pressure detection, and particularly relates to an ultrasonic pressure detection module, a detection method thereof and electronic equipment comprising the ultrasonic pressure detection module.

Background

When the sound wave propagates in two media which are contacted with each other, the sound wave is reflected at the contact surface of the two media. If the contact area of the two media is large, generally, the reflection coefficient of the acoustic wave is considered to be a fixed value, and the magnitude of the reflection coefficient is only related to the acoustic impedances of the two media; however, if the contact area between the two media is limited, the reflection coefficient of the acoustic wave is related to the acoustic impedances of the two media and the contact area thereof, and the larger the contact area is, the larger the reflection coefficient is.

Disclosure of Invention

Based on the above, the invention provides an ultrasonic pressure detection module, a detection method thereof and an electronic device, which realize pressure detection of touch pressing according to a corresponding relationship between pressing force and pressing contact area and a corresponding relationship between reflection signal intensity and pressing contact area.

The invention provides an ultrasonic pressure detection module for detecting the touch pressing pressure of a finger, which comprises a cover plate for pressing the finger by touch, an ultrasonic sensor arranged below the cover plate and a processor electrically connected with the ultrasonic sensor; the ultrasonic sensor is used for transmitting a first ultrasonic signal with frequency lower than preset frequency to a finger and receiving a second ultrasonic signal reflected by a contact part of the finger and the cover plate; the processor is used for controlling the ultrasonic sensor to emit the first ultrasonic signal and acquiring the second ultrasonic signal so as to obtain a pressure value of pressing the cover plate by a finger according to the intensity of the second ultrasonic signal; the intensity of the second ultrasonic signal changes along with the change of the contact area of the finger and the cover plate, and the intensity of the second ultrasonic signal is in direct proportion to the contact area of the finger and the cover plate; the contact area of the finger and the cover plate changes along with the change of the pressure value of the finger pressing the cover plate, and the contact area of the finger and the cover plate is in direct proportion.

The intensity of the second ultrasonic signal and the contact area of the finger and the cover plate satisfy the corresponding relation:

the contact area of the finger and the cover plate and the pressure value of the finger pressing the cover plate meet the corresponding relation:

A＝S(f,β)，

the V is_iIs the intensity of the second ultrasonic signal, the V₀Is the intensity of the first ultrasonic signal, A is the contact area of the finger with the cover plate, and Z₁、Z₂The acoustic impedances of the finger and the cover plate are respectively, the S is a calculation function of A, the f is a pressure value of the cover plate pressed by the finger, and the β is a characteristic parameter of the finger.

In the ultrasonic pressure detection module, the first ultrasonic signal is transmitted to a finger through the ultrasonic sensor, the second ultrasonic signal reflected by the contact part of the finger and the cover plate is received, and the processor can reversely deduce the pressure value of the cover plate pressed by the finger according to the corresponding relation among the intensity of the second ultrasonic signal, the contact area of the finger and the cover plate and the pressure value of the cover plate pressed by the finger, so that the pressure detection function is realized.

Preferably, in one embodiment, the preset frequency ranges from 1MHz to 2 MHz. Because the frequency of first ultrasonic signal is not higher than 2MHz, and the penetrating power is strong, the decay is few and resolution ratio is low, is favorable to obtaining accurate reliable second ultrasonic signal, the finger that the backstepping obtained presses the pressure value of apron is also more accurate.

Further, in one of them embodiment, the ultrasonic pressure detection module group still includes the fingerprint identification component that the electricity is connected in the treater, the fingerprint identification component is used for gathering the fingerprint information of this finger and will the fingerprint information converts the electrical signal when the finger presses the apron, the treater is according to the electrical signal discernment the fingerprint information; when the fingerprint information is identified to be matched fingerprint information, the processor controls the ultrasonic pressure sensor to transmit the first ultrasonic signal to the finger so as to detect the pressure value of the cover plate pressed by the finger. By arranging the fingerprint elements, the ultrasonic pressure detection module can realize a fingerprint identification function so as to execute operations such as unlocking, awakening and the like, and can meet various application requirements when the fingerprint identification function and the pressure detection function are combined together, so that the ultrasonic pressure detection module has stronger practicability; in addition, fingerprint information discernment is during the fingerprint information of matching, ultrasonic pressure detection module just is used for the touch-control of finger to press pressure measurement, can prevent the apron carries out pressure measurement when being touched by non-matched finger or other things mistake, is favorable to energy saving.

Preferably, in one embodiment, the fingerprint identification element is disposed between the cover plate and the ultrasonic sensor. The finger is close to the fingerprint identification element, which is beneficial to acquiring accurate fingerprint information.

In another aspect, the present invention further provides an ultrasonic pressure detection method for an ultrasonic pressure detection module, where the ultrasonic pressure detection module includes a cover plate, an ultrasonic sensor disposed below the cover plate, and a processor electrically connected to the ultrasonic sensor, and the ultrasonic pressure detection method includes: when a finger presses the cover plate, the ultrasonic sensor is controlled to transmit a first ultrasonic signal with frequency lower than preset frequency to the finger; receiving a second ultrasonic signal of the first ultrasonic signal reflected by a contact part of a finger and the cover plate; and obtaining the pressure value of the finger pressing the cover plate according to the strength of the second ultrasonic signal.

The intensity of the second ultrasonic signal and the contact area of the finger and the cover plate satisfy the corresponding relation:

the contact area of the finger and the cover plate and the pressure value of the finger pressing the cover plate meet the corresponding relation:

A＝S(f,β)，

the V is_iIs the intensity of the second ultrasonic signal, the V₀Is the intensity of the first ultrasonic signal, A is the contact area of the finger with the cover plate, and Z₁、Z₂Respectively the acoustic impedances of the finger and the cover plate, S is a calculation function of A, and f is the pressing of the finger on the cover plateβ is a finger characteristic parameter.

In the ultrasonic pressure detection method, the first ultrasonic signal is transmitted to a finger through the ultrasonic sensor, the second ultrasonic signal reflected by a contact part of the finger and the cover plate is received, and the processor can reversely deduce a pressure value of the finger pressing the cover plate according to a corresponding relation among the intensity of the second ultrasonic signal, the contact area of the finger and the cover plate and a pressure value of the finger pressing the cover plate, so that the pressure detection is realized.

Preferably, in one embodiment, the preset frequency ranges from 1MHz to 2 MHz. Because the frequency of first ultrasonic signal is not higher than 2MHz, and the penetrating power is strong, the decay is few and resolution ratio is low, is favorable to obtaining accurate reliable second ultrasonic signal, the finger that the backstepping obtained presses the pressure value of apron is also more accurate.

Further, in one embodiment, the ultrasonic pressure detection module further includes a fingerprint identification element electrically connected to the processor, and the step of controlling the ultrasonic sensor to emit a first ultrasonic signal with a frequency lower than a preset frequency to the finger when the finger presses the cover plate includes: when a finger presses the cover plate, the fingerprint identification element is controlled to collect fingerprint information of the finger and convert the fingerprint information into an electric signal; and identifying the fingerprint information according to the electric signal, and controlling the ultrasonic pressure sensor to transmit the first ultrasonic signal to the finger when the fingerprint information is identified as matched fingerprint information.

Among the above-mentioned ultrasonic pressure detection method, when fingerprint information discernment is the fingerprint information of matching, the touch-control that ultrasonic pressure detection module just was used for the finger is pressed pressure and is detected, can prevent the apron carries out pressure detection when being touched by non-matched finger or other things mistake, is favorable to energy saving.

In another aspect, the present invention further provides an electronic device, including the ultrasonic pressure detection module in any of the above embodiments, where the ultrasonic pressure detection module is disposed on a front surface, a back surface, or a side surface of the electronic device. Electronic equipment can pass through ultrasonic wave pressure detection module realizes that the touch-control of finger presses pressure detection, moreover, when ultrasonic wave pressure detection module was provided with the other component of fingerprint, can also realize the fingerprint identification function, combines fingerprint identification and pressure detection function, can satisfy multiple application demand, and the practicality is strong.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Fig. 2 is a schematic cross-sectional view of an ultrasonic pressure detection module according to an embodiment of the present invention.

Fig. 3 is a flowchart of an ultrasonic pressure detection method according to an embodiment of the present invention.

Fig. 4 is a sub-flowchart of step S1 in fig. 3.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Referring to fig. 1, an embodiment of the invention provides an electronic apparatus 1000, which includes a housing 100, a display 200, a controller 300, a memory 400, and an ultrasonic pressure detection module 500. The display screen 200 is mounted on the housing 100, the housing 100 and the display screen 200 together enclose to form a containing cavity, the electronic components such as the controller 300, the memory 400, the ultrasonic pressure detection module 500 and the like are contained in the containing cavity, and the controller 300 is electrically connected with the memory 400 and the ultrasonic pressure detection module 500. It should be noted that the electronic device 1000 further includes other electronic components such as a speaker, a camera, an antenna, and a circuit board, which are not described herein since they are not related to the improvement and creation of the present invention.

The electronic device 1000 includes but is not limited to smart devices such as a mobile phone, a tablet computer, a Web browser, and a wearable device; the controller 300 includes but is not limited to a central processing unit, a digital signal processor, a microprocessor, a microcontroller, a single chip, and other control elements; the memory 400 includes, but is not limited to, high speed random access memory, memory banks, solid state memory, and like storage elements. In this embodiment, the electronic device 1000 is a mobile phone, the controller 300 is a central processing unit, and the memory 400 is a solid-state memory.

Referring to fig. 2, the ultrasonic pressure detection module 500 is used for detecting the touch pressing pressure of a finger, and includes a cover plate 10, an ultrasonic sensor 20 disposed below the cover plate 10, and a processor (not shown) electrically connected to the ultrasonic sensor 20. It is understood that the processor may be a processor separate from the controller 300, or the controller 300 itself. In this embodiment, the processor is the controller 300 of the electronic device 1000.

The cover plate 10 is exposed to be pressed by fingers of a user in a touch mode; the ultrasonic sensor 20 is used for transmitting a first ultrasonic signal with a frequency lower than a preset frequency to a finger and receiving a second ultrasonic signal reflected by a contact part of the finger and the cover plate 10; the processor is used for controlling the ultrasonic sensor 20 to emit the first ultrasonic signal, and acquiring the second ultrasonic signal so as to obtain a pressure value of pressing the cover plate 10 by a finger according to the intensity of the second ultrasonic signal, so as to realize a pressure detection function.

Specifically, the analysis process of the processor obtaining the pressure value of the finger pressing the cover plate 10 according to the intensity of the second ultrasonic signal is as follows:

according to the reflection characteristics of the sound wave, when the contact surface of two sound-transmitting media is infinite, the reflection coefficient r of the sound wave at the interface of the two sound-transmitting media can be expressed as:

wherein Z is₁And Z₂Respectively, representing the acoustic impedances of the two sound-transmitting media. According to the formula (1), when the contact surface between two sound transmission media is infinite, the reflection coefficient r of the sound wave at the contact surface between the two sound transmission media is only related to the acoustic impedances of the two sound transmission media, and the acoustic impedances of the sound transmission media are generally fixed, so that the reflection coefficient r is a constant value.

However, when the contact surface of two sound-transmitting media is limited, the reflection coefficient R of the sound wave at the contact surface of the two sound-transmitting media needs to consider the influence of the contact area a of the two sound-transmitting media, and the reflection coefficient R can be expressed as:

according to the formula (2), when the contact surfaces of the two sound transmission media are infinite, the reflection coefficient R of the sound wave at the contact surfaces of the two sound transmission media is related to the acoustic impedances of the two sound transmission media and the contact area a of the two sound transmission media; the acoustic impedances of the two sound transmission media are fixed, and the larger the contact area A of the two sound transmission media is, the larger the reflection coefficient R of the sound wave at the interface of the two sound transmission media is, namely, the two sound transmission media are in direct proportion.

In the present invention, the finger of the user and the cover plate 10 can be regarded as two sound-transmitting media, and the contact surfaces of the two sound-transmitting media are limited, so that the reflection coefficient R of the ultrasonic signal at the contact portion of the finger and the cover plate 10 changes with the change of the contact area a of the finger and the cover plate 10, that is, the reflection coefficient R and the contact area a are in direct proportion. In general, when a finger presses the cover 10, a contact area a between the finger and the cover 10 is related to a pressure value f when the finger presses the cover 10 and a finger characteristic β of a user (for example, a fat layer content of the finger, a difference between male and female fingers, etc.), and therefore, the contact area a may be expressed as:

A＝S(f,β) (3)

wherein, S is a calculation function of the contact area A and can be obtained by multiple times of test sampling and then curve fitting. It can be understood that the finger characteristic β of the same person is fixed, and the difference between the finger characteristics β of different persons is small, so that in the test sampling and fitting process of the function S, the finger characteristic parameter β can be regarded as a fixed value, and the contact area a when the user' S finger presses the cover plate 10 changes with the change of the pressure value f when the user presses the cover plate 10, and the two are in a direct proportional relationship, that is, the larger the pressure value f of the pressing force is, the larger the contact area a when the user presses the cover plate 10 is.

Furthermore, the reflection coefficient R can also be defined as the intensity V of the reflected acoustic signal at the interface of two sound-transmitting media_iWith the intensity V of the incident acoustic signal₀The ratio of (a) to (b), namely:

the intensity V of the reflected sound wave signal can be obtained by combining the formulas (2) to (4)_iThe formula of (2):

it can be understood that, in the present invention, the first ultrasonic signal emitted by the ultrasonic sensor 20 to the finger is the incident sound wave signal of the contact portion between the finger and the cover plate 10, and the second ultrasonic signal reflected by the contact portion between the finger and the cover plate 10 is the corresponding reflected sound wave signal, so that, as can be seen from equation (5), when the intensity V of the incident sound wave signal is greater than the threshold value V, the intensity V of the incident sound wave signal is greater than the threshold value V₀At a certain time, the intensity V of the reflected sound wave signal_iThe intensity of the second ultrasonic signal is proportional to the contact area a of the reflection interface, that is, the contact area a of the finger and the cover plate 10 is proportional to the intensity of the second ultrasonic signal; further, the intensity V of the reflected acoustic signal_iProportional to the pressure f of the finger pressing the cover plate 10, i.e. the intensity V of the reflected sound wave signal_iThere is a corresponding relationship with the pressing force f of the finger pressing the cover plate 10, that is, there is a corresponding relationship between the intensity of the second ultrasonic signal and the pressure value of the finger pressing the cover plate 10. It should be noted that, in the present invention, the memory 400 stores corresponding information between the intensity of the second ultrasonic signal and the pressure value f when the finger presses the cover plate 10, so that after the processor obtains the second ultrasonic signal, the processor can compare the intensity of the second ultrasonic signal with the corresponding information, and according to the comparison result, the pressure value f when the finger presses the cover plate 10 can be obtained by reverse extrapolation.

As described above, in the present invention, the processor can obtain the pressure value f of the finger pressing the cover plate 10 according to the strength of the second ultrasonic signal.

The frequency of the first ultrasonic signal is lower than a preset frequency, specifically, a value range of the preset frequency is preferably 1MHz-2MHz, and more preferably, in this embodiment, the preset frequency is 1 MHz. In other words, the first ultrasonic signal is a low frequency ultrasonic signal below 1 MHz.

It can be understood that, compared to the high-frequency ultrasonic signal, the first ultrasonic signal with the low frequency has a strong penetrating power, and the attenuation of the first ultrasonic signal with the low frequency is reduced in the process of penetrating the substance between the cover plate 10 and the ultrasonic sensor 20 and the cover plate 10, so that the intensity of the incident sound wave signal of the contact part of the finger and the cover plate 10 is strong, and the reflected sound wave signal reflected by the contact part of the finger and the cover plate 10 is also strong; furthermore, the reflected sound wave signals reflected by the contact portion between the finger and the cover plate 10 actually include two sound wave signals reflected by the fingerprint ridge portion and the fingerprint valley portion, when the fingerprint valley has air, the sound wave signals reflected by the fingerprint valley are reflected by the air, and the sound wave signals reflected by the fingerprint ridge are reflected by the finger, the two sound wave signals are different, if the first high-frequency ultrasonic signal is adopted, the resolution is high, the two different sound wave signals can be distinguished obviously, but the finger presses the cover plate 10 to cause the number of the fingerprint valley portions having air to be uncontrollable, so the intensity of the obtained reflected sound wave signals is unreliable, and the difference is that the first low-frequency ultrasonic signal has low resolution, the two reflected sound wave signals cannot be distinguished, but the sound wave signals reflected by the contact portion between the finger and the cover plate 10 are identified as the same reflected sound wave signal, the intensity reliability of the obtained reflected sound wave signal (namely the second ultrasonic wave signal) is high; in summary, the first ultrasonic signal with a low frequency is more favorable for obtaining an accurate and reliable second ultrasonic signal, and then the more accurate pressure value of the cover plate 10 pressed by the finger is obtained by reverse thrust.

Further, as shown in fig. 2, in this embodiment, the ultrasonic pressure detection module 500 further includes a fingerprint identification element 30 electrically connected to the processor, the fingerprint identification element 30 is used for collecting fingerprint information of a finger and converting the fingerprint information into an electrical signal when the cover plate 10 is pressed by the finger, and the processor identifies the fingerprint information according to the electrical signal. The fingerprint identification element 30 is at least one of an optical fingerprint sensor, a capacitive fingerprint sensor, an ultrasonic fingerprint sensor, an inductive fingerprint sensor, or a radio frequency fingerprint sensor. In this embodiment, the fingerprint identification element 30 is a capacitive fingerprint sensor. It should be noted that, in other embodiments, when the fingerprint identification component 30 adopts an ultrasonic sensor to collect fingerprint information, the ultrasonic sensor emits a high-frequency ultrasonic signal to obtain complete and clear fingerprint information.

Preferably, the fingerprint identification element 30 is disposed between the cover plate 10 and the ultrasonic sensor 20, and when the cover plate 10 is pressed by a finger, the finger is close to the fingerprint identification element 30, which is beneficial to acquiring accurate fingerprint information.

It can be understood that a plurality of preset fingerprint information may be stored in the memory 400 of the electronic device 1000, the processor compares the identified fingerprint information with the preset fingerprint information, and when the fingerprint information matches the preset fingerprint information, the processor may control the electronic device 1000 to perform operations such as unlocking and waking up.

Preferably, in this embodiment, when the fingerprint information is identified as matched fingerprint information, the processor controls the ultrasonic pressure sensor 20 to transmit the first ultrasonic signal to the finger to detect a pressure value when the finger presses the cover plate 10, so as to prevent the cover plate 10 from being erroneously touched by a non-matched finger or other objects for pressure detection, thereby saving operation energy consumption of the electronic device 1000.

As shown in fig. 2, in this embodiment, the ultrasonic pressure detecting module 500 further includes a reinforcing plate 40, and the fingerprint identification element 30 and the ultrasonic sensor 20 are respectively located on two opposite sides of the reinforcing plate 40. Specifically, the fingerprint identification element 30 is soldered to a first flexible circuit board 61 through a plurality of solder balls 50 arranged in an array, and the first flexible circuit board 61 is fixed to one side of the reinforcing plate 40 facing the cover plate 10 by means of adhesion; the ultrasonic sensor 20 is disposed on a side of a second flexible circuit board 62 facing the reinforcing plate 40, and a side of the ultrasonic sensor 20 facing away from the second flexible circuit board 62 is fixed to a side of the reinforcing plate 40 facing away from the cover plate 10 by bonding, so that the fingerprint identification element 30 and the ultrasonic sensor 20 are respectively fixed to two opposite sides of the reinforcing plate 40. The first flexible circuit board 61 and the second flexible circuit board 62 are electrically connected to the processor (not shown), so that the fingerprint identification element 30 and the ultrasonic sensor 20 are electrically connected to the processor, respectively.

In other embodiments, the second flexible circuit board 62 may not be provided, and the fingerprint identification element 30 and the ultrasonic sensor 20 are led out through the same first flexible circuit board 61 to be electrically connected to the processor, so that signals generated by the fingerprint identification element 30 and the ultrasonic sensor 20 can be better processed by the processor synchronously. Specifically, the reinforcing plate 40 may be provided with at least one through hole, the ultrasonic sensor 20 is electrically connected to the first flexible circuit board 61 through at least one connection line passing through the at least one through hole, and the fingerprint identification element 30 and the ultrasonic sensor 20 are still respectively located on two opposite sides of the reinforcing plate 40.

The reinforcing plate 40 can prevent the first flexible circuit board 61 from generating defects such as curling and the like, so that connection failure of the fingerprint identification element 30 and the first flexible circuit board 61 is avoided, and the reliability of normal operation of the fingerprint identification element 30 is higher; furthermore, the ultrasonic sensor 20 is disposed on the side of the reinforcing plate 40 opposite to the cover plate 10, and the installation space of the ultrasonic sensor 20 is large, which is beneficial to the installation of the ultrasonic sensor 20. The reinforcing plate 40 is made of a hard material, such as stainless steel, so that the reinforcing plate 40 has a good supporting function.

In addition, as shown in fig. 2, in this embodiment, the ultrasonic pressure detection module 500 further includes a filling layer 70 covering the fingerprint identification element 30, and the filling layer 70 can protect and stabilize the fingerprint identification element 30. In this embodiment, the filling layer 70 may be specifically an epoxy molding compound.

The apron 10 is fixed in through the mode that bonds on the filling layer 70, the apron 10 fingerprint identification component 30 reaches ultrasonic sensor 20 top-down sets up, preferably, fingerprint identification component 30 reaches ultrasonic sensor 20 all is located under the apron 10 for user's finger is pressing when apron 10, comparatively complete fingerprint information can accurately be gathered to fingerprint identification component 30, ultrasonic sensor 20 can be perpendicularly to the finger transmission first ultrasonic signal is in order to do benefit to the detection finger and press the pressure value of apron 10.

The cover plate 10 may be made of ceramic, glass, coating or sapphire. In this embodiment, the cover plate 10 is made of a coating material, and the coating is thin, which is beneficial to improving the sensitivity of the fingerprint identification element 30 for collecting fingerprint information.

It should be noted that the ultrasonic pressure detection module 500 further includes a fixing structure for fixing the ultrasonic pressure detection module 500 on the electronic device 1000, for example, in some embodiments, the fixing structure may be a decorative ring, and the decorative ring is fixedly connected to a side of the first flexible circuit board 61, which faces away from the reinforcing plate 40, by means of adhesion. The cover plate 10, the filling layer 70 and the fingerprint identification element 30 are all accommodated in the central hole of the decoration ring, the cover plate 10 and the end face of one end of the decoration ring far away from the first flexible circuit board 61 are approximately parallel and level, the decoration ring can be embedded in the electronic device 1000, and therefore the ultrasonic pressure detection module 500 is fixed on the front face, the back face or the side face of the electronic device 1000.

Specifically, as shown in fig. 1, in this embodiment, the ultrasonic pressure detection module 500 is disposed on the right side surface of the electronic device 1000, a slot communicated with the accommodating cavity is formed in an area of the right frame of the housing 100 corresponding to the ultrasonic pressure detection module 500, the ultrasonic pressure detection module 500 may be fixed to the slot through a fixing structure such as a decorative ring, the ultrasonic pressure detection module 500 is accommodated in the accommodating cavity and a part of the ultrasonic pressure detection module is accommodated in the slot, and the cover plate 10 is exposed through the slot for a user to press with a finger. In other embodiments, the ultrasonic pressure detection module 500 may be disposed on a left side surface of the electronic device 1000, and a left frame of the housing 100 is correspondingly provided with a slot for exposing the cover plate 10.

In other embodiments, the ultrasonic pressure detection module 500 may also be disposed on the front or back of the electronic device 1000, and the display screen 200 or the housing 100 is correspondingly provided with a slot for exposing the cover plate 10. Of course, when fingerprint identification component 30 of ultrasonic pressure detection module 500 adopts the fingerprint identification technology under the screen, promptly fingerprint identification component 30 is ultrasonic fingerprint sensor or optical fingerprint sensor, the fluting can not be seted up to display screen 200, display screen 200 is the full face screen.

In this embodiment, the ultrasonic pressure detection module 500 is disposed on a side surface of the electronic device 1000, which is not only beneficial to improving the screen occupation ratio of the electronic device 1000, but also beneficial to a user pressing the ultrasonic pressure detection module 500 to execute a corresponding touch operation when holding the electronic device 1000.

Specifically, in some embodiments of the present invention, the processor may further determine a target operation instruction from the plurality of touch operation instructions according to a pressure value of the finger pressing the cover plate 10, and the processor controls the electronic device 1000 to perform different operations according to different target operation instructions. For example, in some specific embodiments, when a pressure value is greater than a first pressure threshold, the processor determines a first operating instruction according to the pressure value; and when the pressure value is larger than a second pressure threshold value, the processor determines a second operation instruction according to the pressure value. Wherein the first pressure threshold is less than the second pressure threshold, and a plurality of preset pressure thresholds can be stored in the memory 400; the touch operation instructions comprise at least two of operation instructions of determining, canceling, entering a preset application program, entering a split screen interface, cleaning a background application program, returning to a home page and the like, and the first operation instruction and the second operation instruction are two different instructions. Of course, in other embodiments, a third pressure threshold or more pressure thresholds may also be preset to correspond to the determination of a third operation command or more operation commands. It can be understood that, when the processor determines the target operation instruction according to the pressure value of the finger pressing the cover plate 10, the user may press the cover plate 10 with any matched finger as long as the pressure value exceeds the preset pressure threshold.

Preferably, in the present invention, the display screen 200 is electrically connected to the processor, and the processor can control the display screen 200 to display a pressure value of the finger pressing the cover plate 10 in real time, for example, the pressure value is displayed in a digital manner to remind a user of the real-time pressing force of the finger pressing the cover plate 10, so that the user can control the pressing force of the finger to determine a target operation instruction.

In other embodiments, the processor is further configured to determine a target operation instruction from a plurality of touch operation instructions according to the identified fingerprint information and the pressure value of the finger pressing the cover plate 10, that is, the processor needs to determine the target operation instruction by combining the fingerprint information and the pressure value. For example, in some specific embodiments, when the fingerprint information is identified as first fingerprint information and a pressure value is greater than a first pressure threshold, the processor determines a first operation instruction according to the first fingerprint information and the pressure value; and when the fingerprint information is identified as second fingerprint information and the pressure value is greater than a second pressure threshold value, the processor determines a second operation instruction according to the second fingerprint information and the pressure value. The first fingerprint information and the second fingerprint information are fingerprint information of different fingers, for example, an index finger and a middle finger of a user, respectively, and a plurality of preset fingerprint information of different fingers may be stored in the memory 400.

In other embodiments, the processor may further determine a target operation instruction from the plurality of touch operation instructions according to the identified fingerprint information, and the user sets one target operation instruction corresponding to each identifiable finger.

It should be noted that the above embodiment is only a partial example, and different target operation instructions may also be freely set according to various combinations of different fingerprint information, different pressure values, and different pressing times, so as to implement more rapid operations, and meet more application requirements of users.

Fig. 3 is a flowchart illustrating an ultrasonic pressure detection method according to an embodiment of the present invention. The ultrasonic pressure detection method can be applied to the ultrasonic pressure detection module 500, and the ultrasonic pressure detection module 500 is used for detecting the touch pressing pressure of a finger and comprises a cover plate 10, an ultrasonic sensor 20 arranged below the cover plate 10 and a processor electrically connected to the ultrasonic sensor 20. As shown in fig. 3, the ultrasonic pressure detection method specifically includes the following steps:

when the finger presses the cover plate 10, the ultrasonic sensor 20 is controlled to emit a first ultrasonic signal having a frequency lower than a preset frequency to the finger (S1).

A second ultrasonic signal of the first ultrasonic signal reflected by the contact portion of the finger with the cover plate 10 is received (S2).

And obtaining the pressure value of the finger pressing the cover plate 10 according to the strength of the second ultrasonic signal.

The value range of the preset frequency is preferably 1MHz-2MHz, and more preferably, the preset frequency is 1 MHz. That is, in this embodiment, the first ultrasonic signal is a low-frequency ultrasonic signal lower than 1MHz, and compared with the high-frequency ultrasonic signal, the low-frequency first ultrasonic signal is reflected by the contact portion between the finger and the cover plate 10, which is beneficial to obtaining a stronger and more accurate second ultrasonic signal.

The intensity of the second ultrasonic signal is in direct proportion to the contact area of the finger and the cover plate 10, and the contact area of the finger and the cover plate 10 is in direct proportion to the pressure value of the finger and the cover plate 10.

Specifically, the intensity of the second ultrasonic signal and the contact area of the finger and the cover plate 10 satisfy the corresponding relationship:

the contact area of the finger and the cover plate 10 and the pressure value of the finger pressing the cover plate satisfy the corresponding relation:

A＝S(f,β)，

wherein, the V_iIs the intensity of the second ultrasonic signal, the V₀Is the intensity of the first ultrasonic signal, A is the contact area of the finger with the cover plate, and Z₁、Z₂The acoustic impedances of the finger and the cover plate are respectively, the S is a calculation function of A, the f is a pressure value of the cover plate pressed by the finger, and the β is a characteristic parameter of the finger.

According to the two relations, when the intensity V of the second ultrasonic signal is obtained_iAccording to the intensity V of the second ultrasonic signal when known_iAnd the corresponding relation between the finger and the contact area A of the cover plate 10, the relation between the finger and the contact area A of the cover plate 10 and the pressure value f when the finger presses the cover plate 10 can be reversely deduced to obtain the pressure value f when the finger presses the cover plate 10, so that the pressure detection of pressing the cover plate 10 by the finger touch is realized.

Further, please refer to fig. 4, which is a sub-flowchart of step S1 in fig. 3. In this embodiment, the ultrasonic pressure detecting module 500 further includes a fingerprint identification element 30 electrically connected to the processor, and the step of controlling the ultrasonic sensor 20 to emit a first ultrasonic signal with a frequency lower than a preset frequency to the finger when the finger presses the cover plate 10 specifically includes:

when a finger presses the cover plate 10, the fingerprint recognition element 30 is controlled to capture fingerprint information of the finger and convert the fingerprint information into an electrical signal (S11).

The fingerprint information is recognized according to the electrical signal, and the ultrasonic pressure sensor 20 is controlled to emit the first ultrasonic signal to the finger when the fingerprint information is recognized as matching fingerprint information (S12).

Wherein the matched fingerprint information is one of a plurality of preset fingerprint information stored in a memory 400 electrically connected to the processor. In this embodiment, after fingerprint identification matches, it controls again ultrasonic pressure sensor 20 launches to the finger first ultrasonic signal is in order to detect the finger and press the pressure value of apron 10 can prevent electronic equipment 1000 from placing in the pocket apron 10 carries out pressure detection when touched by the mistake, is favorable to saving electronic equipment 1000's operation energy consumption.

The fingerprint identification element 30 is at least one of an optical fingerprint sensor, a capacitive fingerprint sensor, an ultrasonic fingerprint sensor, an inductive fingerprint sensor, or a radio frequency fingerprint sensor.

It should be noted that, the ultrasonic pressure detection method provided by the present invention is applied to the ultrasonic pressure detection module 500, the steps of the method executed by the method correspond to the functions executed by the ultrasonic pressure detection module 500, and for a more detailed description, reference may be made to the related contents of the ultrasonic pressure detection module 500.

The foregoing is illustrative of embodiments of the present invention, and it should be noted that various modifications and adaptations can be made by those skilled in the art without departing from the principle of the embodiments of the present invention, and are intended to be within the scope of the present invention.