WO2020259302A1 - Ultrasonic sensor module, display screen module and electronic device - Google Patents

Abstract

Disclosed are an ultrasonic sensor module, a display screen module and an electronic device. The ultrasonic sensor module comprises: a piezoelectric material layer comprising a first region and a second region, which are adjacent; and an electrode layer connected to the piezoelectric material layer, wherein the electrode layer is used for applying a driving signal to the piezoelectric material layer to drive the first region of the piezoelectric material layer to emit an ultrasonic signal with a first frequency and drive the second region of the piezoelectric material layer to emit an ultrasonic signal with a second frequency, and the first frequency is less than the second frequency.

Description

Ultrasonic sensor module, display module and electronic equipment

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office, the application number is 201910551281.2, and the invention title is "Ultrasonic Sensor Module, Display Module and Electronic Equipment" on June 24, 2019, the entire content of which is by reference Incorporated in this application.

Technical field

This application relates to the field of electronic technology, in particular to an ultrasonic sensor module, a display screen module and electronic equipment.

Background technique

With the development of electronic technology, electronic devices such as smart phones are used more and more frequently in users' lives. For example, users can implement call functions, shopping functions, payment functions, etc. through electronic devices.

Generally, during a call on an electronic device, the electronic device needs to detect the distance between the user’s face and the electronic device to control the display of the electronic device to turn on or off, so as to prevent the user’s face from touching the electronic device. Misoperation caused by the display. In scenarios where the user needs to verify the identity of the user, such as unlocking the electronic device, realizing the shopping function through the electronic device, and realizing the payment function through the electronic device, the electronic device needs to identify the user's fingerprint to determine whether the current user has operation authority.

In order to realize the above functions, an independent distance sensor needs to be provided in the electronic device to realize the distance detection function, and an independent fingerprint recognition sensor needs to be provided in the electronic device to realize the fingerprint recognition function.

Summary of the invention

The embodiments of the present application provide an ultrasonic sensor module, a display screen module, and an electronic device, which can increase the screen-to-body ratio of the electronic device display module.

In the first aspect, an embodiment of the present application provides an ultrasonic sensor module, including:

The piezoelectric material layer includes adjacent first and second regions;

An electrode layer connected to the piezoelectric material layer, the electrode layer being used to apply a driving signal to the piezoelectric material layer to drive the first region of the piezoelectric material layer to emit an ultrasonic signal of the first frequency, and The second region of the piezoelectric material layer is driven to emit an ultrasonic signal of a second frequency, the first frequency being lower than the second frequency.

In the second aspect, an embodiment of the present application also provides a display screen module, including:

First substrate layer;

The second substrate layer is arranged on one side of the first substrate layer;

A display layer, arranged between the first substrate layer and the second substrate layer, and the display layer is used to display information;

A piezoelectric material layer is disposed between the first substrate layer and the second substrate layer, and the piezoelectric material layer includes adjacent first and second regions;

An electrode layer is provided between the first substrate layer and the second substrate layer, the electrode layer is connected to the piezoelectric material layer, and the electrode layer is used to apply a driving signal to the piezoelectric material layer , To drive the first area of the piezoelectric material layer to emit an ultrasonic signal at a first frequency, and to drive the second area of the piezoelectric material layer to emit an ultrasonic signal at a second frequency; wherein

The first frequency is less than the second frequency, the ultrasonic signal of the first frequency is used to pass through at least the first substrate layer or the second substrate layer to achieve distance detection, and the ultrasonic signal of the second frequency The signal is used to pass through at least the first substrate layer or the second substrate layer to realize fingerprint recognition.

In the third aspect, an embodiment of the present application also provides an electronic device, including:

case;

The display screen module is installed on the housing;

The ultrasonic sensor module is installed in the housing, the ultrasonic sensor module is arranged on a side away from the display surface of the display screen module, and the ultrasonic sensor module includes:

The piezoelectric material layer includes adjacent first and second regions;

An electrode layer connected to the piezoelectric material layer, the electrode layer being used to apply a driving signal to the piezoelectric material layer to drive the first region of the piezoelectric material layer to emit an ultrasonic signal of the first frequency, and The second region of the piezoelectric material layer is driven to emit an ultrasonic signal of a second frequency, the first frequency being lower than the second frequency.

In a fourth aspect, an embodiment of the present application also provides an electronic device, including:

case;

The display screen module is installed on the housing, and the display screen module includes:

First substrate layer;

The second substrate layer is arranged on one side of the first substrate layer;

A display layer, arranged between the first substrate layer and the second substrate layer, and the display layer is used to display information;

A piezoelectric material layer is disposed between the first substrate layer and the second substrate layer, and the piezoelectric material layer includes adjacent first and second regions;

An electrode layer is provided between the first substrate layer and the second substrate layer, the electrode layer is connected to the piezoelectric material layer, and the electrode layer is used to apply a driving signal to the piezoelectric material layer , To drive the first area of the piezoelectric material layer to emit an ultrasonic signal at a first frequency, and to drive the second area of the piezoelectric material layer to emit an ultrasonic signal at a second frequency; wherein

The first frequency is less than the second frequency, the ultrasonic signal of the first frequency is used to pass through at least the first substrate layer or the second substrate layer to achieve distance detection, and the ultrasonic signal of the second frequency The signal is used to pass through at least the first substrate layer or the second substrate layer to realize fingerprint recognition.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings that need to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

FIG. 1 is a schematic diagram of the first structure of an electronic device provided by an embodiment of this application.

Fig. 2 is a cross-sectional view of the electronic device shown in Fig. 1 along the direction P1-P1.

FIG. 3 is a schematic diagram of the first structure of an ultrasonic sensor module provided by an embodiment of the application.

FIG. 4 is a schematic diagram of a second structure of an ultrasonic sensor module provided by an embodiment of the application.

FIG. 5 is a schematic diagram of the structure of the second electrode layer in the ultrasonic sensor module provided by an embodiment of the application.

6 is a schematic diagram of the structure of the first electrode layer in the ultrasonic sensor module provided by an embodiment of the application.

FIG. 7 is a schematic diagram of the connection relationship between the control chip and the first electrode layer and the second electrode layer in the ultrasonic sensor module provided by an embodiment of the application.

FIG. 8 is a schematic diagram of a second structure of an electronic device provided by an embodiment of this application.

Fig. 9 is a cross-sectional view of the electronic device shown in Fig. 8 along the P2-P2 direction.

FIG. 10 is a schematic diagram of the first structure of a display screen module provided by an embodiment of the application.

FIG. 11 is a schematic diagram of a second structure of a display screen module provided by an embodiment of the application.

FIG. 12 is a schematic diagram of a third structure of a display screen module provided by an embodiment of the application.

FIG. 13 is a schematic diagram of an application scenario for distance detection of an electronic device provided by an embodiment of the application.

FIG. 14 is a schematic diagram of an application scenario of fingerprint recognition by an electronic device provided by an embodiment of the application.

FIG. 15 is a schematic diagram of the principle of fingerprint recognition performed by an electronic device according to an embodiment of the application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative work are within the protection scope of this application.

The embodiment of the application provides an electronic device. The electronic device may be a smart phone, a tablet computer, etc., or a game device, AR (Augmented Reality) device, automobile device, data storage device, audio playback device, video playback device, notebook computer, desktop computing Equipment etc.

1 and FIG. 2, FIG. 1 is a schematic diagram of the first structure of an electronic device provided by an embodiment of this application, and FIG. 2 is a cross-sectional view of the electronic device shown in FIG. 1 along the direction P1-P1.

The electronic device 100 includes a display screen module 10, an ultrasonic sensor module 20, a middle frame 30, a circuit board 40, a battery 50 and a back cover 60.

The display screen module 10 can be installed on the middle frame 30 and connected to the back cover 60 through the middle frame 30 to form a display surface of the electronic device 100 for displaying images, text and other information. The display module 10 may include a liquid crystal display (Liquid Crystal Display, LCD) or an organic light-emitting diode display (Organic Light-Emitting Diode, OLED).

It is understandable that a cover plate may also be provided on the display module 10. The cover plate covers the display screen module 10 to protect the display screen module 10 from being scratched or damaged by water. Wherein, the cover may be a transparent glass cover, so that the user can observe the information displayed by the display screen module 10 through the cover. For example, the cover plate may be a glass cover plate made of sapphire.

The ultrasonic sensor module 20 may be arranged at the bottom of the display screen module 10 and installed on the middle frame 30. That is, the ultrasonic sensor module 20 is arranged on a side away from the display surface of the display screen module 10. The display surface of the display screen module 10 is the side of the display screen module 10 facing the user when displaying information.

The ultrasonic sensor module 20 is used to realize the distance detection function of the electronic device 100 and realize the fingerprint recognition function of the electronic device 100. Wherein, the ultrasonic sensor module 20 can emit ultrasonic signals. The ultrasonic signal penetrates the display screen module 10 to contact an obstacle (such as a user's face) and generate a reflected signal. The ultrasonic sensor module 20 receives the reflected signal, and transmits ultrasonic waves according to the intensity of the reflected signal. The time difference between the signal and receiving the reflected signal can detect the distance between the obstacle and the electronic device 100. On the other hand, when the electronic device needs to perform fingerprint recognition, the ultrasonic signal penetrates the display screen module 10 to contact the user's finger, and different parts of the fingerprint pattern on the user's finger reflect different reflection signals. The ultrasonic sensor The module 20 receives the reflected signal and obtains the fingerprint image of the user's finger according to the reflected signal, so that fingerprint recognition can be performed.

The middle frame 30 may have a thin plate-like or sheet-like structure, or a hollow frame structure. The middle frame 30 is used to provide a supporting function for the electronic components or functional components in the electronic device 100 so as to install the electronic components and functional components in the electronic device 100 together.

Wherein, the middle frame 30 and the back cover 60 may jointly form a housing of the electronic device 100, which is used to accommodate or install electronic components, functional components, etc. of the electronic device. For example, the display screen module 10 may be installed on the housing, and the ultrasonic sensor module 20 may be installed in the housing. In addition, the camera, receiver, circuit board, battery and other functional components of the electronic device can be installed on the middle frame 30 for fixing. It is understandable that the material of the middle frame 30 may include metal or plastic.

The circuit board 40 may be installed on the middle frame 30. The circuit board 40 may be the main board of the electronic device 100. Wherein, the circuit board 40 may be integrated with one or more of functional components such as a microphone, a speaker, a receiver, an earphone interface, a camera, an acceleration sensor, a gyroscope, and a processor. At the same time, the display screen module 10 can be electrically connected to the circuit board 40 to control the display of the display screen module 10 through a processor on the circuit board 40.

The battery 50 may be installed on the middle frame 30. At the same time, the battery 50 is electrically connected to the circuit board 40 so that the battery 50 can supply power to the electronic device 100. Wherein, the circuit board 40 may be provided with a power management circuit. The power management circuit is used to distribute the voltage provided by the battery 50 to various electronic components in the electronic device 100.

The back cover 60 may be integrally formed. During the molding process of the back cover 60, a rear camera hole and other structures may be formed on the back cover 60.

Referring to FIG. 3, FIG. 3 is a schematic diagram of the first structure of the ultrasonic sensor module 20 according to an embodiment of the application.

Among them, the ultrasonic sensor module 20 includes a piezoelectric material layer 21 and an electrode layer 22 that are stacked.

The piezoelectric material layer 21 can generate ultrasonic signals when a voltage is applied, and emit ultrasonic signals to the outside. The voltage applied to the piezoelectric material layer 21 may be, for example, a driving signal. It can be understood that the driving signal is a high-frequency alternating current signal. The material of the piezoelectric material layer 21 may include piezoelectric ceramics, for example. That is, the piezoelectric material layer 21 may be a layered structure formed of piezoelectric ceramics.

Wherein, the piezoelectric material layer 21 includes adjacent first area 21A and second area 21B. The first area 21A is used to transmit an ultrasonic signal of a first frequency. The second area 21B is used to transmit ultrasonic signals of the second frequency. Wherein, the first frequency is less than the second frequency. The ultrasonic signal of the first frequency is used to transmit the display module 10 of the electronic device 100 to realize the distance detection function of the electronic device 100, and the ultrasonic signal of the second frequency is used to transmit the display module of the electronic device 100. The group 10 thus realizes the fingerprint recognition function of the electronic device 100.

Therefore, the ultrasonic sensor module 20 provided by the embodiment of the present application can transmit ultrasonic signals of different frequencies through the first area 21A and the second area 21B of the piezoelectric material layer 21, so that it can pass through the first area 21A and the The second area 21B implements different functions, so as to realize the functional multiplexing of the ultrasonic sensor module 20.

In addition, the ultrasonic sensor module 20 provided by the embodiment of the present application can simultaneously realize the distance detection function and the fingerprint recognition function. In addition, when the ultrasonic sensor module 20 realizes distance detection and fingerprint recognition, it is detected and recognized by ultrasonic signals, which can pass through the display module, so that the display module does not need to be an ultrasonic sensor module The non-display area is set separately in 20, that is, the occupation of the non-display area of the display module by the ultrasonic sensor module 20 can be reduced, so the screen-to-body ratio of the display module can be increased.

It should be noted that the higher the frequency of the ultrasonic signal, the shorter the wavelength, the better the linear propagation, the less likely to be diffraction when it comes into contact with obstacles, and the greater the loss during transmission in the medium. Correspondingly, the smaller the frequency of the ultrasonic signal, the longer the wavelength, the worse the linear propagation, the relatively easy to diffract when it comes into contact with obstacles, and the relatively small loss during transmission in the medium.

When electronic equipment is performing distance detection, that is, when detecting the distance between an obstacle (such as a human face) and an electronic device, the obstacle and the electronic device are usually not in direct contact, that is, the distance between the obstacle and the electronic device is relatively short. far. After the ultrasonic signal emitted by the ultrasonic sensor module 20 passes through the display module 10, it needs to be transmitted in the air for a certain distance before it touches the obstacle. In order to reduce the loss caused when the ultrasonic signal is transmitted in the air, the frequency of the ultrasonic signal used for distance detection is set to be relatively small, that is, the first frequency is small.

Wherein, the range of the first frequency may be between 20KHz and 1MHz, that is, the first frequency is greater than 20KHz and less than 1MHz. For example, the first frequency may be 60KHz.

When the electronic device performs fingerprint recognition, usually the user's finger is in direct contact with the electronic device, for example, the user's finger touches or presses on the display module 10, that is, the distance between the user's finger and the electronic device is relatively close. After passing through the display module 10, the ultrasonic signal emitted by the ultrasonic sensor module 20 can directly touch the user's finger without being transmitted in the air. At this time, the loss of the ultrasonic signal during the entire transmission process is relatively small. of. In order to improve the accuracy of collecting user fingerprint images, that is, to improve the clarity of the collected fingerprint images, it is possible to minimize the diffraction of the ultrasonic signal when it touches the user’s finger. Therefore, the frequency setting of the ultrasonic signal used for fingerprint recognition is relatively Larger, that is, the second frequency is larger.

Wherein, the range of the second frequency may be greater than 10 MHz. For example, the second frequency may be 12MHz.

It can be understood that the scene where the electronic device 100 needs to perform distance detection is usually a call scene. For example, when the electronic device 100 is in a scene such as a phone call scene, a voice call scene, a voice broadcast message, etc., it is usually necessary to detect the distance between an obstacle and the electronic device 100 to prevent the electronic device 100 from being mistakenly touched by the obstacle. operating. In these call scenarios, it is necessary to transmit sound signals to the outside through the receiver or speaker of the electronic device 100. In electronic equipment, sound-producing components such as receivers and speakers are usually arranged at the end of the electronic equipment. For example, the receiver may be provided at the top end of the electronic device 100, and the speaker may be provided at the bottom end of the electronic device 100. That is, it can be understood that the part where the electronic device transmits the sound signal is relatively fixed, and is usually located at the end of the electronic device, and when the user listens to the sound signal transmitted from the electronic device, the ear or face is naturally also Will be near the end of the electronic device.

In order to accurately detect the distance between an obstacle (user's ear or face) and the electronic device 100 when the electronic device 100 is in a call scene, the detection part for distance detection may also be set at the end of the electronic device 100.

Therefore, in the ultrasonic sensor module 20, the first area 21A of the piezoelectric material layer 21 may be located at one end of the piezoelectric material layer 21. For example, as shown in FIG. 3, the first region 21A is located at the right end of the piezoelectric material layer 21. It is understandable that FIG. 3 is only a schematic diagram. If the position of the ultrasonic sensor module 20 in the electronic device 100 when the electronic device 100 is placed vertically, the first area 21A may be located on the piezoelectric material. The top or bottom of layer 21.

In addition, since the part of the electronic device that transmits the sound signal to the outside is relatively fixed, and is usually located at the end of the electronic device, the area where the electronic device transmits the sound signal to the electronic device also occupies a relatively small area. When the electronic device performs fingerprint recognition, the position where the user touches or presses on the display module of the electronic device is not fixed, and the area on the display module that supports the user’s touch or press is large, so the electronic device The fingerprint recognition area needs to cover a larger area.

Therefore, in the ultrasonic sensor module 20, the area of the first region 21A of the piezoelectric material 21 is smaller than the area of the second region 21B. Therefore, the ultrasonic sensor module 20 can realize distance detection in a relatively fixed range through the first area 21A, and can realize fingerprint recognition in a larger range through the second area 21B.

Continue to refer to FIG. 3, wherein the electrode layer 22 is connected to the piezoelectric material layer 21. For example, the electrode layer 22 and the piezoelectric material layer 21 can be stacked and connected.

Wherein, the electrode layer 22 is used to apply a driving signal to the piezoelectric material layer 21 to drive the first region 21A of the piezoelectric material layer 21 to emit an ultrasonic signal of a first frequency, and to drive the piezoelectric material The second area 21B of the layer 21 emits an ultrasonic signal of the second frequency. Wherein, the driving signal may be a high-frequency alternating current signal, such as a high-frequency pulse signal. The first frequency is less than the second frequency.

It can be understood that the electrode layer 22 may include two electrode layers spaced apart from each other, for example, a positive electrode layer and a negative electrode layer.

Referring to FIG. 4, FIG. 4 is a schematic diagram of the second structure of the ultrasonic sensor module 20 provided by an embodiment of the application.

The electrode layer 22 includes a first electrode layer 221 and a second electrode layer 222 arranged at intervals. The first electrode layer 221 is disposed on one side of the piezoelectric material layer 21 and connected to the piezoelectric material layer 21. The second electrode layer 222 is disposed on the other side of the piezoelectric material layer 21 and connected to the piezoelectric material layer 21.

The first electrode layer 221 and the second electrode layer 222 constitute two electrodes of the piezoelectric material layer 21. For example, the first electrode layer 221 may be a positive electrode layer of the piezoelectric material layer 21, and the second electrode layer 222 may be a negative electrode layer of the piezoelectric material layer 21. It is understandable that the functions of the first electrode layer 221 and the second electrode layer 222 can also be interchanged, that is, the first electrode layer 221 is the negative electrode layer of the piezoelectric material layer 21, and the The second electrode layer 222 is the positive electrode layer of the piezoelectric material 21.

Wherein, the first electrode layer 221 and the second electrode layer 222 are used to jointly apply a driving signal to the piezoelectric material layer 21. For example, the first electrode layer 221 and the second electrode layer 222 may have different potentials to form a potential difference on the piezoelectric material layer 21 so that a driving signal can be applied to the piezoelectric material layer 21.

It should be noted that when the piezoelectric material layer 21 is driven by the drive signal to transmit an ultrasonic signal, the frequency of the transmitted ultrasonic signal is the same as the frequency of the drive signal. That is, what is the frequency of the driving signal applied to the piezoelectric material layer 21, and what is the frequency of the ultrasonic signal emitted by the piezoelectric material layer 21.

Therefore, in order to drive different regions of the piezoelectric material layer 21 to emit ultrasonic signals of different frequencies, driving signals of different frequencies may be applied to different regions of the piezoelectric material layer 21.

Wherein, the first electrode layer 221 may be set as an equipotential layer. That is, the potentials at any positions of the first electrode layer 221 are equal.

The second electrode layer 222 includes adjacent first electrode regions 222A and second electrode regions 222B.

Wherein, the first electrode area 222A is disposed opposite to the first area 21A of the piezoelectric material layer 21, and the first electrode area 222A is connected to the first area 21A of the piezoelectric material 21. The first electrode region 222A and the first electrode layer 221 are used to jointly apply a driving signal of a first frequency to the first region 21A of the piezoelectric material layer 21 to drive the first region 21A to emit the Ultrasonic signal of the first frequency. For example, the first electrode region 222A and the first electrode layer 221 may be used to jointly apply a driving signal of 60 KHz to the first region 21A of the piezoelectric material layer 21.

The second electrode area 222B is arranged opposite to the second area 21B of the piezoelectric material layer 21, and the second electrode area 222B is connected to the second area 21B of the piezoelectric material 21. The second electrode area 222B and the first electrode layer 221 are used to jointly apply a driving signal of a second frequency to the second area 21B of the piezoelectric material layer 21 to drive the second area 21B to emit the Ultrasonic signal of the second frequency. For example, the second electrode region 222B and the first electrode layer 221 may be used to jointly apply a 12 MHz driving signal to the second region 21B of the piezoelectric material layer 21.

Referring to FIG. 5, FIG. 5 is a schematic structural diagram of the second electrode layer in the ultrasonic sensor module provided by an embodiment of the application.

It can be understood that the second electrode layer 222 may include a plurality of electrodes electrically insulated from each other. Each electrode is connected to a point on the piezoelectric material layer 21 to drive the point connected to the electrode to vibrate to generate an ultrasonic signal.

Wherein, the first electrode region 222A of the second electrode layer 222 includes a plurality of first electrodes 2221 that are electrically insulated from each other. Each of the first electrodes 2221 is connected to the first region 21A of the piezoelectric material layer 21. For example, each of the first electrodes 2221 is connected to a point in the first area 21A to drive the connected points in the first area 21A to vibrate to generate an ultrasonic signal.

It should be noted that the first electrode region 222A including a plurality of first electrodes 2221 that are electrically insulated from each other is only a feasible implementation. It can be understood that, the first electrode area 222A may also include a whole electrode, instead of being divided into a plurality of first electrodes electrically insulated from each other. For example, the first electrode area 222A may be composed of a metal electrode plate.

The second electrode region 222B of the second electrode layer 222 includes a plurality of second electrodes 2222 electrically insulated from each other. Each of the second electrodes 2222 is connected to the second region 21B of the piezoelectric material layer 21. For example, each of the second electrodes 2222 is connected to a point in the second area 21B to drive the connected points in the second area 21B to vibrate to generate an ultrasonic signal.

It should be noted that the second electrode region 222B including a plurality of second electrodes 2222 electrically insulated from each other is only a feasible implementation. It can be understood that the second electrode area 222B may also include a whole electrode, and is not divided into a plurality of second electrodes electrically insulated from each other. For example, the second electrode area 222B may also be composed of a metal electrode plate.

Referring to FIG. 6, FIG. 6 is a schematic diagram of the structure of the first electrode layer in the ultrasonic sensor module provided by an embodiment of the application.

It can be understood that the first electrode layer 221 may also include a plurality of electrodes electrically insulated from each other. For example, as shown in FIG. 6, the first electrode layer 221 includes a plurality of third electrodes 2211 that are electrically insulated from each other. Each of the third electrodes 2211 is connected to the piezoelectric material layer 21. Wherein, the potentials of the plurality of third electrodes 2211 are equal, so that the first electrode layer 221 can be formed as an equipotential layer.

Wherein, in the ultrasonic sensor module 20, each third electrode 2211 on the first electrode layer 221 is opposite to a position of a first electrode 2221 on the second electrode layer 222, or opposite to a position of a second electrode 2222 . Each third electrode 2211 and one first electrode 2221 and the portion of the piezoelectric material layer 21 between the third electrode 2211 and the first electrode 2221 can be understood as an ultrasonic sensor pixel. Each third electrode 2211 and a second electrode 2222 and the portion of the piezoelectric material layer 21 between the third electrode 2211 and the second electrode 2222 can also be understood as an ultrasonic sensor pixel. That is, each pixel of the ultrasonic sensor includes a part of the piezoelectric material layer 21, the third electrode 2211 connected to the part, the first electrode 2221 or the second electrode 2222 connected to the part. Therefore, by controlling the potential of each third electrode 2211, each first electrode 2221, and each second electrode 2222, each pixel of the ultrasonic sensor can be controlled.

It can be understood that the ultrasonic sensor module 20 may also include a control chip. The control chip is connected to the electrode layer 22 of the ultrasonic sensor module 20. The control chip is used to control the driving signal applied by the electrode layer 22 to the piezoelectric material layer 21.

Referring to FIG. 7, FIG. 7 is a schematic diagram of the connection relationship between the control chip and the first electrode layer and the second electrode layer in the ultrasonic sensor module provided by an embodiment of the application.

Among them, the ultrasonic sensor module 20 includes a control chip 23. The control chip 23 is respectively connected to the first electrode layer 221 and the second electrode layer 222 in the electrode layer 22.

For example, as shown in FIG. 7, the control chip 23 through _{x 1, x 2, x 3} , ......, x i line with each other a third electrode on the first electrode layer 2212211 connected to each The potential of the third electrode 2211 is controlled. Among them, it can be understood that each of the lines x ₁ , x ₂ , x ₃ ,..., x _i can be connected to a plurality of third electrodes 2211 at the same time, thereby reducing the control chip 23 and the first electrode layer 221 The number of lines between. The circuit may be a printed wire, for example.

Similarly, the control chip 23 is connected to each first electrode 2221 and each second electrode 2222 on the second electrode layer 222 through lines y ₁ , y ₂ , y ₃ ,..., y _j, etc. The potential of each of the first electrodes 2221 and each of the second electrodes 2222 is controlled. Among them, it can be understood that each of the lines y ₁ , y ₂ , y ₃ , ..., y _j can be connected to multiple first electrodes 2221 at the same time, or connected to multiple second electrodes 2222 at the same time, thereby The number of lines between the control chip 23 and the second electrode layer 222 can be reduced. The circuit can also be a printed wire.

It can be understood that, in the above electronic device 100, the display screen module 10 and the ultrasonic sensor module 20 may be integrated together. That is, the ultrasonic sensor module 20 can be integrated in the display screen module 10.

Referring to FIGS. 8 and 9, FIG. 8 is a schematic diagram of a second structure of an electronic device provided by an embodiment of this application, and FIG. 9 is a cross-sectional view of the electronic device shown in FIG. 8 along the P2-P2 direction.

The electronic device 100 includes a display screen module 10, a middle frame 30, a circuit board 40, a battery 50 and a back cover 60. The display screen module 10 is integrated with an ultrasonic sensor module.

In the following, only the differences between the display screen module 10 and the display screen module 10 of the electronic device 100 shown in FIG. 1 will be described. For the similarities, reference may be made to the above description, which will not be repeated here. The middle frame 30, the circuit board 40, the battery 50, and the back cover 60 can also refer to the above description, which will not be repeated here.

Referring to FIG. 10, FIG. 10 is a schematic diagram of the first structure of the display screen module 10 according to an embodiment of the application.

Among them, the display screen module 10 includes a first substrate layer 11, a display layer 12, a piezoelectric material layer 13, an electrode layer 14 and a second substrate layer 15 that are stacked.

The second substrate layer 15 is disposed on one side of the first substrate layer 11. The second substrate layer 15 and the first substrate layer 11 form two substrates of the display screen module 10, such as an upper substrate and a lower substrate. The second substrate layer 15 and the first substrate layer 11 provide support and protection for the display layer 12, the piezoelectric material layer 13, and the electrode layer 14.

Wherein, the first substrate layer 11 may be, for example, a glass substrate, and the second substrate layer 15 may also be, for example, a glass substrate.

The display layer 12 is disposed between the first substrate layer 11 and the second substrate layer 15. The display layer 12 is used for displaying information, such as displaying images, texts and other information, so as to realize the display function of the display screen module 10.

Wherein, the display screen module 10 may be a liquid crystal display screen. At this time, the display layer 12 includes liquid crystal, or it is understood that the display layer 12 is a liquid crystal layer. The display screen module 10 may also be an organic light emitting diode display screen. At this time, the display layer 12 includes an organic light-emitting layer, or it is understood that the display layer 12 is an organic light-emitting layer.

The piezoelectric material layer 13 is disposed between the first substrate layer 11 and the second substrate layer 15. The piezoelectric material layer 13 is used to emit an ultrasonic signal of a first frequency and an ultrasonic signal of a second frequency. The ultrasonic signal of the first frequency is used to pass through at least the first substrate layer 11 or the second substrate layer 15 to realize distance detection. The second frequency ultrasonic signal is used to pass through at least the first substrate layer 11 or the second substrate layer 15 to realize fingerprint recognition.

For example, when the display screen module 10 displays information, if the first substrate layer 11 is the side facing the user, the ultrasonic signal of the first frequency passes through the first substrate layer 11 to realize distance detection , The ultrasonic signal of the second frequency passes through the first substrate layer 11 to realize fingerprint recognition; if the second substrate layer 15 is the side facing the user, the ultrasonic signal of the first frequency passes through the The second substrate layer 15 realizes distance detection, and the ultrasonic signal of the second frequency passes through the second substrate layer 15 to realize fingerprint identification.

The specific structure and function of the piezoelectric material layer 13 can refer to the description of the piezoelectric material layer 21 in the ultrasonic sensor module 20 above, and will not be repeated here.

Wherein, when the first area of the piezoelectric material layer 13 is located at one end of the piezoelectric material layer 13, the orthographic projection of the first area on the display layer 12 is located at one end of the display layer 12. unit.

The electrode layer 14 is disposed between the first substrate layer 11 and the second substrate layer 15. The specific structure and function of the electrode layer 14 and the relationship with the piezoelectric material layer 13 can refer to the above description of the electrode layer 22 in the ultrasonic sensor module 20, which will not be repeated here.

Referring to FIG. 11, FIG. 11 is a schematic diagram of a second structure of the display screen module 10 according to an embodiment of the application.

It can be understood that the electrode layer 14 may include a first electrode layer 141 and a second electrode layer 142. Wherein, the first electrode layer 141 is disposed between the first substrate layer 11 and the display layer 12, the second electrode layer 142 is disposed between the display layer 12 and the second substrate layer 15, and the piezoelectric material layer 13 is provided between the display layer 12 and the second electrode layer 142.

When the display screen module 10 displays information, if the first substrate layer 11 is the side facing the user, the ultrasonic signal of the first frequency passes through the display layer 12 and the first electrode layer 141 And the first substrate layer 11 is to realize distance detection, and the ultrasonic signal of the second frequency is transmitted through the display layer 12, the first electrode layer 141 and the first substrate layer 11 to realize fingerprint recognition.

When the display screen module 10 displays information, if the second substrate layer 15 is the side facing the user, the ultrasonic signal of the first frequency passes through the second electrode layer 142 and the second substrate The layer 15 is used to realize distance detection, and the ultrasonic signal of the second frequency passes through the second electrode layer 142 and the second substrate layer 15 to realize fingerprint recognition.

Wherein, the first electrode layer 141 can refer to the above description of the first electrode layer 221 in the ultrasonic sensor module 20, and the second electrode layer 142 can refer to the above description of the second electrode layer in the ultrasonic sensor module 20. The description of the electrode layer 222 will not be repeated here.

It is understandable that the arrangement positions of the display layer 12 and the piezoelectric material layer 13 in the display screen module 10 can also be exchanged.

Referring to FIG. 12, FIG. 12 is a schematic diagram of a third structure of the display screen module 10 according to an embodiment of the application.

Wherein, the first electrode layer 141 is disposed between the first substrate layer 11 and the display layer 12, the second electrode layer 142 is disposed between the display layer 12 and the second substrate layer 15, and the piezoelectric material layer 13 is provided between the first electrode layer 141 and the display layer 12.

When the display screen module 10 displays information, if the first substrate layer 11 is the side facing the user, the ultrasonic signal of the first frequency passes through the first electrode layer 141, the first substrate The layer 11 is used to realize distance detection, and the ultrasonic signal of the second frequency passes through the first electrode layer 141 and the first substrate layer 11 to realize fingerprint recognition.

When the display screen module 10 displays information, if the second substrate layer 15 is the side facing the user, the ultrasonic signal of the first frequency passes through the display layer 12 and the second electrode layer 142 And the second substrate layer 15 can realize distance detection, and the ultrasonic signal of the second frequency can pass through the display layer 12, the second electrode layer 142 and the second substrate layer 15 to realize fingerprint recognition.

The display module 10 provided by the embodiment of the present application can simultaneously realize the distance detection function and the fingerprint recognition function. In addition, when the display module 10 realizes distance detection and fingerprint recognition, it is detected and recognized by ultrasonic signals, which can pass through the display module 10, so that there is no need to separately set a non-display area on the display module 10 , That is, the area of the non-display area on the display module 10 can be reduced, so the screen-to-body ratio of the display module can be increased.

Referring to FIG. 13, FIG. 13 is a schematic diagram of an application scenario for distance detection of an electronic device provided by an embodiment of the application.

Wherein, when the electronic device needs to perform distance detection, for example, when the electronic device is in a scene of making a call, a voice call, or a voice message, the electronic device controls the piezoelectric material layer 21 in the ultrasonic sensor module 20 or the display screen. The piezoelectric material layer 13 in the module 10 emits an ultrasonic signal of the first frequency. When the ultrasonic signal contacts an obstacle (such as a user's face), a reflected signal is generated, and the reflected signal is transmitted to the electronic device and received by the piezoelectric material layer. The electronic device can detect the distance between the obstacle and the electronic device according to the intensity of the received reflected signal. Alternatively, the electronic device may also obtain the distance between the obstacle and the electronic device according to the time interval between the first time when the ultrasonic signal is transmitted and the second time when the reflected signal is received and the transmission speed of the ultrasonic signal.

14 and 15, FIG. 14 is a schematic diagram of an application scenario of fingerprint recognition by an electronic device according to an embodiment of the application, and FIG. 15 is a schematic diagram of a principle of fingerprint recognition by an electronic device according to an embodiment of the application.

Wherein, when the user's finger touches or presses on the surface of the electronic device (such as the surface of the display module), the electronic device controls the piezoelectric material layer 21 in the ultrasonic sensor module 20 or the piezoelectric material in the display module 10 Layer 13 emits an ultrasonic signal of the second frequency. When the ultrasonic signal touches the finger, it produces a reflected signal. The reflected signal is received by the piezoelectric material layer. Subsequently, the electronic device converts the received reflected signal into a corresponding electrical signal, and the fingerprint image of the user's finger can be obtained.

It is understandable that there are fingerprint patterns on the surface of the finger, and the fingerprint patterns are formed by uneven areas. Therefore, when different areas of the fingerprint pattern reflect ultrasonic signals to form a reflected signal, the intensity of the reflected signal is different, and the intensity of the reflected signal from different parts of the finger received by the piezoelectric material layer is also different. Therefore, the electronic device can obtain the concavity and convexity of different parts of the finger according to the reflected signal intensity of different parts of the finger, which can form a three-dimensional fingerprint image of the user's finger.

For example, the deepest concave part in the fingerprint pattern can be called the fingerprint valley, and the highest convex part in the fingerprint pattern can be called the fingerprint ridge. When the user's finger reflects the ultrasonic signal to generate the reflected signal, the reflected signal intensity generated by the fingerprint valley is the weakest, and the reflected signal intensity generated by the fingerprint ridge is the strongest. The electronic device can identify the fingerprint valley and fingerprint ridge on the finger according to the intensity of the reflected signal generated by the received different parts of the finger.

In the description of this application, it should be understood that terms such as "first" and "second" are only used to distinguish similar objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the indicated technology The number of features.

The ultrasonic sensor module, display screen module, and electronic equipment provided in the embodiments of the present application are described in detail above. Specific examples are used in this article to illustrate the principles and implementations of the application, and the description of the above examples is only used to help understand the application. At the same time, for those skilled in the art, according to the idea of the application, there will be changes in the specific implementation and the scope of application. In summary, the content of this specification should not be construed as a limitation of the application.

Claims (20)

1. An ultrasonic sensor module, including:

   The piezoelectric material layer includes adjacent first and second regions;

   An electrode layer connected to the piezoelectric material layer, the electrode layer being used to apply a driving signal to the piezoelectric material layer to drive the first region of the piezoelectric material layer to emit an ultrasonic signal of the first frequency, and The second region of the piezoelectric material layer is driven to emit an ultrasonic signal of a second frequency, the first frequency being lower than the second frequency.
2. The ultrasonic sensor module of claim 1, wherein the electrode layer comprises:

   The first electrode layer is arranged on one side of the piezoelectric material layer and connected to the piezoelectric material layer;

   The second electrode layer is arranged on the other side of the piezoelectric material layer and connected to the piezoelectric material layer;

   Wherein, the first electrode layer and the second electrode layer are used to jointly apply a driving signal to the piezoelectric material layer.
3. The ultrasonic sensor module according to claim 2, wherein the first electrode layer is an equipotential layer, and the second electrode layer comprises:

   The first electrode area is connected to the first area of the piezoelectric material layer, and the first electrode area and the first electrode layer are used to jointly apply a driving signal of a first frequency to the first area to drive The first area emits an ultrasonic signal of the first frequency;

   The second electrode area is connected to the second area of the piezoelectric material layer, and the second electrode area and the first electrode layer are used to jointly apply a driving signal of a second frequency to the second area to drive The second area emits an ultrasonic signal of the second frequency.
4. 4. The ultrasonic sensor module of claim 3, wherein:

   The first electrode area includes a plurality of first electrodes electrically insulated from each other, and each of the first electrodes is connected to the first area of the piezoelectric material layer;

   The second electrode area includes a plurality of second electrodes electrically insulated from each other, and each of the second electrodes is connected to the second area of the piezoelectric material layer.
5. The ultrasonic sensor module according to claim 1, further comprising:

   The control chip is connected to the electrode layer, and the control chip is used to control the driving signal applied by the electrode layer to the piezoelectric material layer.
6. 3. The ultrasonic sensor module of claim 1, wherein the first area is located at one end of the piezoelectric material layer, and the area of the first area is smaller than the area of the second area.
7. 3. The ultrasonic sensor module of claim 1, wherein the first frequency is greater than 20 KHz and less than 1 MHz, and the second frequency is greater than 10 MHz.
8. A display screen module includes:

   First substrate layer;

   The second substrate layer is arranged on one side of the first substrate layer;

   A display layer, arranged between the first substrate layer and the second substrate layer, and the display layer is used to display information;

   A piezoelectric material layer is disposed between the first substrate layer and the second substrate layer, and the piezoelectric material layer includes adjacent first and second regions;

   An electrode layer is provided between the first substrate layer and the second substrate layer, the electrode layer is connected to the piezoelectric material layer, and the electrode layer is used to apply a driving signal to the piezoelectric material layer , To drive the first area of the piezoelectric material layer to emit an ultrasonic signal at a first frequency, and to drive the second area of the piezoelectric material layer to emit an ultrasonic signal at a second frequency; wherein

   The first frequency is less than the second frequency, the ultrasonic signal of the first frequency is used to pass through at least the first substrate layer or the second substrate layer to achieve distance detection, and the ultrasonic signal of the second frequency The signal is used to pass through at least the first substrate layer or the second substrate layer to realize fingerprint recognition.
9. 8. The display screen module of claim 8, wherein the electrode layer comprises:

   The first electrode layer is arranged on one side of the piezoelectric material layer and connected to the piezoelectric material layer;

   The second electrode layer is arranged on the other side of the piezoelectric material layer and connected to the piezoelectric material layer;

   Wherein, the first electrode layer and the second electrode layer are used to jointly apply a driving signal to the piezoelectric material layer.
10. 11. The display screen module of claim 9, wherein the first electrode layer is an equipotential layer, and the second electrode layer comprises:

    The first electrode area is connected to the first area of the piezoelectric material layer, and the first electrode area and the first electrode layer are used to jointly apply a driving signal of a first frequency to the first area to drive The first region emits an ultrasonic signal of the first frequency;

    The second electrode area is connected to the second area of the piezoelectric material layer, and the second electrode area and the first electrode layer are used to jointly apply a driving signal of a second frequency to the second area to drive The second area emits an ultrasonic signal of the second frequency.
11. The display screen module according to claim 10, wherein:

    The first electrode area includes a plurality of first electrodes electrically insulated from each other, and each of the first electrodes is connected to the first area of the piezoelectric material layer;

    The second electrode area includes a plurality of second electrodes electrically insulated from each other, and each of the second electrodes is connected to the second area of the piezoelectric material layer.
12. 8. The display screen module of claim 8, further comprising:

    The control chip is connected to the electrode layer, and the control chip is used to control the driving signal applied by the electrode layer to the piezoelectric material layer.
13. 8. The display screen module of claim 8, wherein the orthographic projection of the first area on the display layer is located at one end of the display layer, and the area of the first area is smaller than that of the second area The area.
14. 8. The display screen module of claim 8, wherein the first frequency is greater than 20 KHz and less than 1 MHz, and the second frequency is greater than 10 MHz.
15. 8. The display screen module of claim 8, wherein the display layer comprises a liquid crystal layer or an organic light emitting layer.
16. An electronic device including:

    case;

    The display screen module is installed on the housing;

    The ultrasonic sensor module is installed in the housing, the ultrasonic sensor module is arranged on a side away from the display surface of the display screen module, and the ultrasonic sensor module includes:

    The piezoelectric material layer includes adjacent first and second regions;

    An electrode layer connected to the piezoelectric material layer, the electrode layer being used to apply a driving signal to the piezoelectric material layer to drive the first region of the piezoelectric material layer to emit an ultrasonic signal of the first frequency, and The second region of the piezoelectric material layer is driven to emit an ultrasonic signal of a second frequency, the first frequency being lower than the second frequency.
17. The electronic device according to claim 16, wherein the electrode layer comprises:

    The first electrode layer is arranged on one side of the piezoelectric material layer and connected to the piezoelectric material layer;

    The second electrode layer is arranged on the other side of the piezoelectric material layer and connected to the piezoelectric material layer;

    Wherein, the first electrode layer and the second electrode layer are used to jointly apply a driving signal to the piezoelectric material layer.
18. The electronic device according to claim 17, wherein the first electrode layer is an equipotential layer, and the second electrode layer comprises:

    The first electrode area is connected to the first area of the piezoelectric material layer, and the first electrode area and the first electrode layer are used to jointly apply a driving signal of a first frequency to the first area to drive The first area emits an ultrasonic signal of the first frequency;

    The second electrode area is connected to the second area of the piezoelectric material layer, and the second electrode area and the first electrode layer are used to jointly apply a driving signal of a second frequency to the second area to drive The second area emits an ultrasonic signal of the second frequency.
19. The electronic device according to claim 18, wherein the first electrode area comprises a plurality of first electrodes electrically insulated from each other, and each of the first electrodes is connected to the first area of the piezoelectric material layer;

    The second electrode area includes a plurality of second electrodes electrically insulated from each other, and each of the second electrodes is connected to the second area of the piezoelectric material layer.
20. An electronic device including:

    case;

    The display screen module is installed on the housing, and the display screen module includes:

    First substrate layer;

    The second substrate layer is arranged on one side of the first substrate layer;

    A display layer, arranged between the first substrate layer and the second substrate layer, and the display layer is used to display information;

    A piezoelectric material layer is disposed between the first substrate layer and the second substrate layer, and the piezoelectric material layer includes adjacent first and second regions;

    An electrode layer is provided between the first substrate layer and the second substrate layer, the electrode layer is connected to the piezoelectric material layer, and the electrode layer is used to apply a driving signal to the piezoelectric material layer , To drive the first area of the piezoelectric material layer to emit an ultrasonic signal at a first frequency, and to drive the second area of the piezoelectric material layer to emit an ultrasonic signal at a second frequency; wherein

    The first frequency is less than the second frequency, the ultrasonic signal of the first frequency is used to pass through at least the first substrate layer or the second substrate layer to achieve distance detection, and the ultrasonic signal of the second frequency The signal is used to pass through at least the first substrate layer or the second substrate layer to realize fingerprint recognition.

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