Electronic device and detection method thereof

Abstract

The present application discloses an electronic device and a detection method thereof, wherein the electronic device has a pressure-sensing detection mode and a fingerprint recognition mode, and the electronic device includes: an ultrasonic fingerprint module having a first working surface and a second working surface; a display module, wherein the first working surface of the ultrasonic fingerprint module is arranged in contact with the display module; an elastic member and a support member, wherein the second working surface of the ultrasonic fingerprint module is arranged on the support member through the elastic member, and the elastic member and the support member have different acoustic impedances; the ultrasonic fingerprint module transmits and receives ultrasonic signals through the first working surface for fingerprint recognition; and the ultrasonic fingerprint module transmits and receives ultrasonic signals through the second working surface for pressure-sensing detection.

Description

Technical Field

[0001] The present application relates to the field of touch technology, and in particular to an electronic device and a detection method thereof. Background Art

[0002] With the rapid development of electronic device technology, under-screen fingerprint recognition has become a key development direction in fingerprint recognition technology. Under-screen optical fingerprint technology is becoming increasingly mature, and ultrasonic fingerprint technology is also gradually being adopted. Ultrasonic fingerprint technology offers advantages in fast entry and unlocking, security, and accuracy. At the same time, under-screen pressure button technology has been widely used in terminals, improving the user experience in scenarios such as gaming.

[0003] However, in current mobile phone designs, the pressure-sensing module is typically positioned away from the fingerprint module, limiting its layout space. Typically, when the pressure-sensing module and fingerprint module are placed together, the module is positioned at the edge, resulting in insufficient deformation detection and a decrease in detection sensitivity. Furthermore, overlapping the fingerprint and pressure-sensing modules creates structural and functional conflicts. Summary of the Invention

[0004] The present application aims to provide an electronic device and a detection method thereof, which at least solves the problem that the current layout of the pressure sensing module and the fingerprint module easily causes structural and functional conflicts between the two.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides an electronic device having a pressure detection mode and a fingerprint recognition mode, the electronic device comprising:

[0007] An ultrasonic fingerprint module having a first working surface and a second working surface;

[0008] A display module, wherein the first working surface of the ultrasonic fingerprint module is arranged in contact with the display module;

[0009] An elastic member and a support member, wherein the second working surface of the ultrasonic fingerprint module is arranged on the support member through the elastic member, and the elastic member and the support member have different acoustic impedances;

[0010] The ultrasonic fingerprint module transmits and receives ultrasonic signals through the first working surface to perform fingerprint recognition; the ultrasonic fingerprint module transmits and receives ultrasonic signals through the second working surface to perform pressure sensing detection.

[0011] In a second aspect, the embodiments of the present application further provide a detection method, which is applied to the above-mentioned electronic device. The detection method includes:

[0012] When the electronic device is in the fingerprint recognition mode, the ultrasonic fingerprint module transmits and receives ultrasonic signals through the first working surface, and determines the fingerprint pressed on the display module based on the transmitted and received ultrasonic signals;

[0013] When the electronic device is in the pressure sensing detection mode, the ultrasonic fingerprint module transmits and receives ultrasonic signals through the second working surface, and determines the pressure applied to the display module based on the time difference between transmitting and receiving the ultrasonic signals.

[0014] In a third aspect, the embodiments of the present application further provide another detection method, which is applied to the above-mentioned electronic device. The detection method includes:

[0015] When the electronic device is in the fingerprint recognition mode, the ultrasonic fingerprint module transmits and receives ultrasonic signals through the first working surface, and determines the fingerprint pressed on the display module based on the transmitted and received ultrasonic signals;

[0016] When the electronic device is in the pressure sensing detection mode, the ultrasonic fingerprint module transmits and receives ultrasonic signals through the second working surface, and determines the pressure applied to the display module based on the signal strength of the transmitted and received ultrasonic signals.

[0017] In an embodiment of the present application, a first working surface and a second working surface are set on the ultrasonic fingerprint module, a display module is set on the first working surface of the ultrasonic fingerprint module, and the second working surface of the ultrasonic fingerprint module is set on a support member through an elastic member, so that the ultrasonic fingerprint module can transmit and receive ultrasonic signals through the first working surface to realize ultrasonic fingerprint recognition, and can also transmit and receive ultrasonic signals through the second working surface to realize under-screen pressure detection, so that a single ultrasonic fingerprint module can replace the traditional pressure sensing module and the original ultrasonic fingerprint module, realize the reuse of the ultrasonic fingerprint module, and thereby optimize the structural design of the electronic device.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 This is one of the schematic diagrams of an ultrasonic fingerprint module in the prior art;

[0021] Figure 2 This is the second schematic diagram of an ultrasonic fingerprint module in the prior art;

[0022] Figure 3 is one of the schematic diagrams of an electronic device provided according to an embodiment of the present application;

[0023] Figure 4 is a schematic diagram of an elastic member in a free state in an electronic device provided according to an embodiment of the present application;

[0024] Figure 5 is a schematic diagram of an elastic member in a compressed state in an electronic device provided according to an embodiment of the present application;

[0025] Figure 6 is a schematic diagram of a metal electrode layer in an electronic device according to an embodiment of the present application;

[0026] Figure 7 One of the flow charts of the detection method provided in the embodiment of the present application;

[0027] Figure 8 The second flow chart of the detection method provided in the embodiment of the present application;

[0028] Figure 9 This is a schematic diagram of the structure of a control system of a detection method provided in one embodiment of the present application;

[0029] Figure 10 It is a structural diagram of the electronic device provided in this application.

[0030] Reference numerals:

[0031] 10. Ultrasonic fingerprint module; 101. First drive electrode; 102. Second drive electrode; 103. Piezoelectric body; 104. Metal electrode layer; 105. Opening area; 20. Display module; 201. Cover plate; 202. Display panel; 203. Pressure-sensitive adhesive layer; 30. Elastic member; 40. Support member; 901. First detection module; 902. Second detection module; 1010. Processor; 1020. Communication interface; 1030. Memory; 1040. Communication bus; 50. Transmission signal; 60. Reflection signal. DETAILED DESCRIPTION

[0032] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0033] The features of the terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0034] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0035] Currently, most under-display pressure sensing designs use the piezoresistive effect to detect pressure. Pressure causes a piezoresistor to change its resistance. This resistance change is then converted into an electrical signal via a Wheatstone bridge circuit. This electrical signal is then converted into a digital signal and fed into a processor for processing. The typical design of a sensing module is as follows: The sensing module is typically mounted below the display module. When the display module is pressed, it deforms, which is then transmitted through the display module to the pressure sensing module below. The pressure sensing module detects the deformation of the piezoresistor and infers the pressure applied to the display module. Each pressure sensing unit is a detection point. Arranging the pressure sensing units in a specific pattern under the display can detect pressure at various locations on the display module. When an object presses on the display module, the deformation is transmitted to nearby pressure sensing units. These units, upon receiving the deformation, send an electrical signal to the processor. The processor identifies which pressure sensing unit or units are pressed and, combined with the position information sensed by the touchscreen, infers the pressure applied at the pressed location.

[0036] The pressure sensing solution is mature, but it takes up a lot of space under the screen, which will cause a certain amount of space waste for other under-screen modules. Electronic devices will use under-screen ultrasonic fingerprint modules to occupy a considerable amount of under-screen space, such as Figure 1 As shown, this creates an awkward situation where the ultrasonic fingerprint module and the pressure-sensing module cannot coexist. In a traditional ultrasonic fingerprint module, as shown in Figure 2, the ultrasonic fingerprint module 10 needs to be placed close to the display module 20 to detect the weak ultrasonic signal reflected by the finger. At the same time, the pressure-sensing module must also be placed close to the display module 20 to detect subtle deformations of the display module 20. When a mobile terminal device is to be equipped with an under-screen ultrasonic fingerprint module 10, the under-screen pressure-sensing module is often placed away from the ultrasonic fingerprint module 10.

[0037] Taking reliability and assembly clearance into consideration, the pressure-sensing module needs to be placed under the screen in a certain arrangement and spacing, and the sensing signal needs to be calibrated accordingly based on the point position of the display module 20 and the sensor position. In current mobile phone structural designs, the pressure-sensing module usually avoids the ultrasonic fingerprint module 10, which limits the layout space of the pressure-sensing module. Generally, when the pressure-sensing module and the ultrasonic fingerprint module 10 are arranged together, the pressure-sensing module is placed at the edge. This results in insufficient deformation detection by the pressure-sensing module, resulting in reduced detection sensitivity.

[0038] To solve the above problems, the following Figure 3 The electronic device proposed in accordance with the embodiments of the present application is described. The electronic device may be a smartphone, a game console, a tablet computer, an e-book reader, or a wearable device. Of course, the electronic device may also be other devices, and the embodiments of the present application do not limit this.

[0039] Taking a smart phone as an example, the electronic device has a pressure sensing mode and a fingerprint recognition mode, and the electronic device includes: an ultrasonic fingerprint module 10 , a display module 20 , an elastic member 30 and a support member 40 .

[0040] In this embodiment, the ultrasonic fingerprint module 10 has a first working surface and a second working surface. The ultrasonic fingerprint module 10 can transmit and receive ultrasonic signals through the first working surface, and the ultrasonic fingerprint module 10 can also transmit and receive ultrasonic signals through the second working surface. The positions of the first working surface and the second working surface of the ultrasonic fingerprint module 10 can be adjusted as needed. For example, the first working surface and the second working surface can be arranged on the same side or opposite sides of the ultrasonic fingerprint module 10.

[0041] The display module 20 is used to display the screen of the electronic device. The first working surface of the ultrasonic fingerprint module 10 is placed in contact with the display module 20. The display module 20 is placed on the first working surface of the ultrasonic fingerprint module 10. The second working surface of the ultrasonic fingerprint module 10 is placed on the support member 40 via an elastic member 30. The elastic member 30 is made of a material that is easily compressed and deformed, such as foam or silicone. When squeezed, the elastic member 30 will deform and switch between a free state and a compressed state. The support member 40 is a hard material that supports the elastic member 30.

[0042] The elastic member 30 and the support member 40 have different acoustic impedances, also known as acoustic wave impedance or sound resistance. The essence of sound wave propagation is the propagation of small perturbations in a medium that deviate from its equilibrium state. Acoustic impedance is the resistance required to displace the medium. Acoustic impedance (Z) is a physical property of a medium. Each medium has a unique acoustic impedance, representing the medium's resistance to sound wave transmission. Its value is the product of the medium's density and velocity.

[0043] Since the elastic member 30 and the support member 40 have different acoustic impedances, reflection and transmission phenomena will occur at the interface between the elastic member 30 and the support member 40. If the difference in acoustic impedance between the two different media is large, strong ultrasonic reflection will occur. Figure 4 As shown, the transmission signal 50 passes through the elastic member 30 and the support member 40 , and a reflection signal 60 is generated at the interface between the elastic member 30 and the support member 40 .

[0044] When the electronic device is in fingerprint recognition mode, if the display module 20 is subjected to downward pressure from the finger, the elastic member 30 is squeezed and deformed, and the ultrasonic fingerprint module 10 transmits and receives ultrasonic signals through the first working surface. The ultrasonic signals pass through the display module 20, and part of the ultrasonic signals are reflected back to the ultrasonic fingerprint module 10 after passing through the fingerprint on the display module 20. Thus, the ultrasonic fingerprint module 10 can perform fingerprint recognition based on the transmitted and received ultrasonic signals and determine the fingerprint pressed on the display module 20.

[0045] When the electronic device is in the pressure detection mode, if the display module 20 is subjected to downward pressure from the finger, the elastic part 30 is squeezed and deformed, and the ultrasonic fingerprint module 10 transmits and receives ultrasonic signals through the second working surface. The ultrasonic signals pass through the elastic part 30, and part of the ultrasonic signals are reflected back to the ultrasonic fingerprint module 10 through the support part 40. In this way, the ultrasonic fingerprint module 10 can perform pressure detection based on the transmitted and received ultrasonic signals to determine the pressure pressed on the display module 20.

[0046] The use of the ultrasonic fingerprint module 10 to reuse the pressure sensing module function solves the problem that the pressure sensing module and the original ultrasonic fingerprint module 10 cannot be arranged at the same time, realizes the coexistence of ultrasonic fingerprint and pressure sensing functions, and optimizes the structural layout of the electronic device.

[0047] In an embodiment of the present application, a first working surface and a second working surface are set on the ultrasonic fingerprint module 10, the display module 20 is set on the first working surface of the ultrasonic fingerprint module 10, and the second working surface of the ultrasonic fingerprint module 10 is set on the support member 40 through the elastic member 30, so that the ultrasonic fingerprint module 10 can transmit and receive ultrasonic signals through the first working surface to realize ultrasonic fingerprint recognition, and can also transmit and receive ultrasonic signals through the second working surface to realize under-screen pressure detection, so that a single ultrasonic fingerprint module 10 can replace the traditional pressure sensing module and the original ultrasonic fingerprint module 10, thereby realizing the reuse of the ultrasonic fingerprint module 10, and is not limited to placing the pressure sensing unit at the edge of the display module 20 to increase the sensing area, thereby optimizing the structural design of the electronic device.

[0048] In one example, the first working surface and the second working surface are arranged on opposite sides of the ultrasonic fingerprint module 10. In this embodiment, the first working surface is arranged on the top surface of the ultrasonic fingerprint module 10, and the second working surface is arranged on the bottom surface of the ultrasonic fingerprint module 10. Accordingly, the electronic device has two control modes.

[0049] Control method 1: Calculate the pressure applied to the display module 20 based on the signal strength of the transmitted and received ultrasonic signals.

[0050] Z=d·c

[0051] Where Z is the acoustic impedance, d is the medium density, and c is the speed of the sound wave. When the elastic member 30 is subjected to pressure, its volume is compressed, thereby changing the density of the elastic member 30. When the density of the elastic member 30 changes, the acoustic impedance of the ultrasonic wave transmission is affected.

[0052] When the display module 20 is subjected to downward pressure from a finger, the display module 20 drives the ultrasonic fingerprint module 10 to deform and compresses the elastic member 30 to deform. When the elastic member 30 is squeezed, the density of the elastic member 30 changes.

[0053] Because the elastic member 30 has different densities before and after compression, and thus different acoustic impedances to ultrasonic signals, the ultrasonic signal intensity reflected at the interface between the elastic member 30 and the support member 40 also varies. Therefore, the ultrasonic fingerprint module 10 can calculate the pressure applied to the display module 20 by measuring the intensity of the reflected ultrasonic signal.

[0054] When the electronic device is in the pressure detection mode, if the display module 20 is subjected to downward pressure from the finger, the elastic part 30 is squeezed and deformed, and the ultrasonic fingerprint module 10 transmits and receives ultrasonic signals through the second working surface. The ultrasonic signals pass through the elastic part 30, and part of the ultrasonic signals are reflected back to the ultrasonic fingerprint module 10 through the support part 40. In this way, the ultrasonic fingerprint module 10 can determine the pressure on the display module 20 based on the signal strength of the transmitted and received ultrasonic signals.

[0055] Control method 2: Calculate the pressure applied to the display module 20 based on the time difference between transmitting and receiving ultrasonic signals.

[0056] When the display module 20 is subjected to downward pressure from a finger, the display module 20 drives the ultrasonic fingerprint module 10 to deform and compresses the elastic member 30 to deform. The magnitude of the deformation is related to the pressure applied to the display module 20 .

[0057] like Figure 4 As shown, the elastic member 30 is in a free state and has no pre-tightening force. At this time, the length of the elastic member 30 is L1. Figure 5As shown, when the elastic member 30 is in a compressed state, it will deform due to the preload force. At this time, the length of the elastic member 30 is L2, so the deformation of the elastic member 30 is ΔL = L1 - L2. The preload force F is calculated based on the mathematical relationship between ΔL and the preload force F, which is as follows:

[0058] F=(E·S·ΔL) / L

[0059] Where F is the preload force of the elastic member 30; E is the elastic modulus of the elastic member 30; S is the cross-sectional area of ​​the elastic member 30; ΔL is the deformation of the elastic member 30; and L1 is the clamping length (uncompressed length) of the elastic member 30. Based on the formula, the ultrasonic fingerprint module 10 calculates the current preload force F of the elastic member 30 based on ΔL. The ultrasonic fingerprint module 10 can transmit and receive ultrasonic signals, measure and calculate the time of flight difference between the transmitted and echoed electrical signals, and determine the flight distance based on speed and time.

[0060] When the electronic device is in pressure-sensing detection mode, if the display module 20 is subjected to downward pressure from the finger, the elastic member 30 is squeezed and deformed, and the ultrasonic fingerprint module 10 transmits and receives ultrasonic signals through the second working surface. The ultrasonic signal passes through the elastic member 30, and part of the ultrasonic signal is reflected back to the ultrasonic fingerprint module 10 through the support member 40. By accurately measuring the time from the ultrasonic signal being emitted to the reflected wave returning from the other end, the path ΔL traveled by the ultrasonic signal during this period is calculated. When the elastic member 30 is compressed, the change in the path is the shortening of the elastic member 30, and the clamping force of the elastic member 30 can be converted from the shortened length ΔL. Determine the pressure pressing on the display module 20. Mapping the pressure magnitude according to the deformation of the elastic member 30 effectively increases the signal-to-noise ratio.

[0061] In one example, if Figures 3 to 5 As shown, the ultrasonic fingerprint module 10 includes a piezoelectric body 103 , a first driving electrode 101 and a second driving electrode 102 .

[0062] In this embodiment, the piezoelectric body 103 can be deformed under the action of an external force, causing the charged particles to undergo relative displacement. The piezoelectric body 103 is used to cooperate with the first driving electrode 101 and the second driving electrode 102 to transmit and receive ultrasonic signals.

[0063] The first driving electrode 101 is disposed between the piezoelectric body 103 and the display module 20 , that is, the first driving electrode 101 is disposed on the top surface of the piezoelectric body 103 . The first driving electrode 101 is used to cooperate with the piezoelectric body 103 to transmit and receive ultrasonic signals through the first working surface.

[0064] During operation, the first driving electrode 101 and the piezoelectric body 103 transmit and receive ultrasonic signals through the first working surface. The ultrasonic signals pass through the display module 20, and part of the ultrasonic signals are reflected back to the first driving electrode 101 and the piezoelectric body 103 through the fingerprint on the display module 20. Therefore, the first driving electrode 101 and the piezoelectric body 103 can determine the fingerprint pressed on the display module 20 based on the transmitted and received ultrasonic signals.

[0065] In order to increase the range of fingerprint detection, a plurality of first driving electrodes 101 may be provided, and the plurality of first driving electrodes 101 are used to cooperate with the piezoelectric body 103 to transmit and receive ultrasonic signals through the first working surface.

[0066] The second driving electrode 102 is disposed between the piezoelectric body 103 and the elastic member 30 , that is, the second driving electrode 102 is disposed on the bottom surface of the piezoelectric body 103 . The second driving electrode 102 is used to cooperate with the piezoelectric body 103 to transmit and receive ultrasonic signals through the second working surface.

[0067] During operation, the second driving electrode 102 and the piezoelectric body 103 transmit and receive ultrasonic signals through the second working surface. The ultrasonic signals pass through the elastic member 30, and part of the ultrasonic signals are reflected back to the second driving electrode 102 and the piezoelectric body 103 through the support member 40, so that the second driving electrode 102 and the piezoelectric body 103 can determine the pressure pressed on the display module 20 based on the transmitted and received ultrasonic signals.

[0068] To increase the sensitivity of pressure sensing, multiple second drive electrodes 102 can be provided. Accordingly, multiple elastic members 30 can also be provided. These multiple second drive electrodes 102 cooperate with the piezoelectric element 103 to transmit and receive ultrasonic signals through the second working surface. By providing multiple second drive electrodes 102, the ultrasonic fingerprint module 10 has a larger layout space. After the ultrasonic fingerprint module 10 reuses the pressure sensing module, the pressure sensing detection area is larger and more sensitive than traditional pressure sensing.

[0069] It should be noted that the first driving electrode 101 and the second driving electrode 102 are both thin film transistor (TFT) driving electrodes. The TFT driving electrodes include a thin film transistor (TFT) array, and voltage can be applied through the thin film transistor layer to enable the piezoelectric layer to emit ultrasonic signals.

[0070] The TFT driving electrode of the first driving electrode 101 is disposed between the piezoelectric body 103 and the display module 20, that is, the TFT driving electrode of the first driving electrode 101 is disposed on the top surface of the piezoelectric body 103. The TFT driving electrode of the first driving electrode 101 is used to cooperate with the piezoelectric body 103 to transmit and receive ultrasonic signals through the first working surface. The TFT driving electrode of the second driving electrode 102 is disposed between the piezoelectric body 103 and the elastic member 30, that is, the TFT driving electrode of the second driving electrode 102 is disposed on the bottom surface of the piezoelectric body 103. The TFT driving electrode of the second driving electrode 102 is used to cooperate with the piezoelectric body 103 to transmit and receive ultrasonic signals through the second working surface.

[0071] In one embodiment, Figures 3 to 5 As shown, the ultrasonic fingerprint module 10 also includes: a metal electrode layer 104, which is arranged between the piezoelectric body 103 and the elastic member 30, that is, the metal electrode layer 104 is arranged on the bottom surface of the piezoelectric body 103, and an opening area is provided in the metal electrode layer 104, and the second driving electrode 102 is arranged in the opening area.

[0072] Therefore, compared with the common pressure sensing module solution, the ultrasonic fingerprint module 10 reuses the pressure sensing module and does not need to open a hole on the middle frame to place the second driving electrode 102, which is beneficial to improving the structural strength and stress reliability of the device.

[0073] In order to increase the sensitivity of pressure detection, such as Figure 6 As shown, the metal electrode layer 104 is provided with a plurality of opening areas 105, and the plurality of opening areas 105 are arranged at intervals, and each opening area 105 is provided with a second driving electrode 102. Thus, each second driving electrode 102 is arranged between the piezoelectric body 103 and the elastic member 30, that is, each second driving electrode 102 is arranged on the bottom surface of the piezoelectric body 103, and each second driving electrode 102 can be used to cooperate with the piezoelectric body 103 to transmit and receive ultrasonic signals through the second working surface, that is, multiple pressure sensing detection points can be realized in the ultrasonic fingerprint module 10. By providing multiple second driving electrodes 102, the layout space of the ultrasonic fingerprint module 10 is larger. After the ultrasonic fingerprint module 10 reuses the pressure sensing module, the pressure sensing detection area is larger and more sensitive than the traditional pressure sensing.

[0074] It should be noted that there are generally multiple elastic members 30, and each second driving electrode 102 in the opening area 105 is disposed on the support member 40 via an elastic member 30. Thus, each second driving electrode 102 is provided with an independent elastic member 30 for cooperation when transmitting and receiving ultrasonic signals, which can greatly improve detection accuracy.

[0075] Based on the above embodiment, in one embodiment, the display module 20 includes: a pressure-sensitive adhesive layer 203, a display panel 202, and a cover plate 201. The pressure-sensitive adhesive layer 203, the display panel 202, and the cover plate 201 are sequentially stacked on the first working surface of the ultrasonic fingerprint module 10.

[0076] Among them, the display panel 202 can be an (Organic Light-Emitting Diode, OLED) display panel, also known as an organic electric laser display or organic light-emitting semiconductor. OLED display panels have the advantages of low power consumption, fast response speed, wide viewing angle, high-resolution display, and soft screen. The pressure-sensitive adhesive layer 203 uses a pressure-sensitive adhesive (PSA), which is a pressure-sensitive adhesive. The bottom surface of the display panel 202 is set on the ultrasonic fingerprint module 10 through the PSA pressure-sensitive adhesive. The cover plate 201 is a transparent screen cover plate used to protect the entire display panel 202.

[0077] When the electronic device is in fingerprint recognition mode, if the cover 201 is subjected to downward pressure from the finger, the elastic member 30 is squeezed and deformed, and the ultrasonic fingerprint module 10 transmits and receives ultrasonic signals through the first working surface. The ultrasonic signals pass through the pressure-sensitive adhesive layer 203, the display panel 202 and the cover 201, and part of the ultrasonic signals are reflected back to the ultrasonic fingerprint module 10 through the fingerprint on the cover 201, so that the ultrasonic fingerprint module 10 can determine the fingerprint pressed on the cover 201 based on the transmitted and received ultrasonic signals.

[0078] When the electronic device is in the pressure detection mode, if the display module 20 is subjected to downward pressure from the finger, the elastic part 30 is squeezed and deformed, and the ultrasonic fingerprint module 10 transmits and receives ultrasonic signals through the second working surface. The ultrasonic signals pass through the elastic part 30, and part of the ultrasonic signals are reflected back to the ultrasonic fingerprint module 10 through the support part 40, so that the ultrasonic fingerprint module 10 can determine the pressure on the cover 201 based on the transmitted and received ultrasonic signals.

[0079] Please refer to Figure 7 , Figure 7 This is one of the flow charts of the detection method provided in the embodiment of the present application. Figure 6 As shown, another embodiment of the present application further provides a detection method, which is applied to the electronic device described in the above embodiment, and the detection method includes the following steps:

[0080] Step S701: When the electronic device is in fingerprint recognition mode, the ultrasonic fingerprint module transmits and receives ultrasonic signals through the first working surface, and determines the fingerprint pressed on the display module according to the transmitted and received ultrasonic signals.

[0081] When the electronic device is in fingerprint recognition mode, if the display module is subjected to downward pressure from the finger, the elastic part is squeezed and deformed, and the ultrasonic fingerprint module transmits and receives ultrasonic signals through the first working surface. The ultrasonic signals pass through the display module, and part of the ultrasonic signals are reflected back to the ultrasonic fingerprint module after passing through the fingerprint on the display module. The ultrasonic fingerprint module can then determine the fingerprint pressed on the display module based on the transmitted and received ultrasonic signals.

[0082] Step S702: When the electronic device is in the pressure sensing detection mode, the ultrasonic fingerprint module transmits and receives ultrasonic signals through the second working surface, and determines the pressure on the display module based on the time difference between transmitting and receiving the ultrasonic signals.

[0083] When the electronic device is in pressure-sensing detection mode, if the display module is subjected to downward pressure from the finger, the elastic member is squeezed and deformed, and the ultrasonic fingerprint module transmits and receives ultrasonic signals through the second working surface. The ultrasonic signal passes through the elastic member, and part of the ultrasonic signal is reflected back to the ultrasonic fingerprint module through the support member. By accurately measuring the time from the ultrasonic signal being emitted to the reflected wave returning from the other end, the path ΔL traveled by the ultrasonic signal during this period is calculated. When the elastic member is compressed, the change in the path is the shortening of the elastic member, and the clamping force of the elastic member can be converted from the shortened length ΔL. Determine the pressure pressing on the display module. Mapping the pressure magnitude according to the deformation of the elastic member effectively increases the signal-to-noise ratio.

[0084] Optionally, whether the electronic device is in fingerprint recognition mode or pressure detection mode can be determined based on the state of the electronic device and the type of application currently running on the electronic device. For example, when the electronic device is in the power-on and unlocked state, fingerprint recognition is required, and the electronic device is in fingerprint recognition mode; or, when the electronic device is in the identity authentication, payment verification, etc. state, fingerprint recognition is required, and the electronic device is in fingerprint recognition mode; for example, when the electronic device is currently running a game application, pressure detection is required to enhance the gaming experience, and therefore the electronic device is in pressure detection mode at this time. In some embodiments, the above-mentioned fingerprint recognition mode or pressure detection mode can also be set through a setting item, that is, it can be set by the user.

[0085] Please refer to Figure 8 , Figure 8 This is the second flow chart of the detection method provided in the embodiment of the present application. Figure 7 As shown, in some embodiments of the present application, the above detection method is specifically described by taking the electronic device as a mobile phone as an example. The detection method is as follows:

[0086] Step S801: When the electronic device is in fingerprint recognition mode, the ultrasonic fingerprint module transmits and receives ultrasonic signals through the first working surface, and determines the fingerprint pressed on the display module according to the transmitted and received ultrasonic signals.

[0087] When the electronic device is in fingerprint recognition mode, if the display module is subjected to downward pressure from the finger, the elastic part is squeezed and deformed, and the ultrasonic fingerprint module transmits and receives ultrasonic signals through the first working surface. The ultrasonic signals pass through the display module, and part of the ultrasonic signals are reflected back to the ultrasonic fingerprint module after passing through the fingerprint on the display module. The ultrasonic fingerprint module can then determine the fingerprint pressed on the display module based on the transmitted and received ultrasonic signals.

[0088] Step S802: When the electronic device is in the pressure sensing detection mode, the ultrasonic fingerprint module transmits and receives ultrasonic signals through the second working surface, and determines the pressure on the display module based on the signal strength of the transmitted and received ultrasonic signals.

[0089] When the electronic device is in pressure detection mode, if the display module is subjected to downward pressure from the finger, the elastic part is squeezed and deformed, and the ultrasonic fingerprint module transmits and receives ultrasonic signals through the second working surface. The ultrasonic signal passes through the elastic part, and part of the ultrasonic signal is reflected back to the ultrasonic fingerprint module through the support part. The ultrasonic fingerprint module can thus determine the pressure on the display module based on the signal strength of the transmitted and received ultrasonic signals.

[0090] The control system of the detection method provided in the present application is described below. The control system of the detection method described below can be referenced to the detection method described above.

[0091] In this embodiment, Figure 9 As shown, the control system of the detection method includes: a first detection module 901 and a second detection module 902.

[0092] Among them, the first detection module 901 is used to, when the electronic device is in the fingerprint recognition mode, the ultrasonic fingerprint module transmits and receives ultrasonic signals through the first working surface, and determines the fingerprint pressed on the display module based on the transmitted and received ultrasonic signals.

[0093] The second detection module 902 is configured to, when the electronic device is in the pressure-sensing detection mode, cause the ultrasonic fingerprint module to transmit and receive ultrasonic signals through the second working surface, and determine the pressure applied to the display module based on the signal strength of the transmitted and received ultrasonic signals. Alternatively, the second detection module 902 is configured to, when the electronic device is in the pressure-sensing detection mode, cause the ultrasonic fingerprint module to transmit and receive ultrasonic signals through the second working surface, and determine the pressure applied to the display module based on the time difference between transmitting and receiving ultrasonic signals.

[0094] The control system in the embodiment of the present application can be an electronic device or a component in the electronic device, such as an integrated circuit or a chip. The electronic device can be a terminal or other devices other than a terminal. For example, the electronic device can be a mobile phone, a tablet computer, a laptop computer, a PDA, an in-vehicle electronic device, a mobile Internet device (MID), an augmented reality (AR) / virtual reality (VR) device, a robot, a wearable device, an ultra-mobile personal computer (UMPC), a netbook or a personal digital assistant (PDA), etc. It can also be a personal computer (PC), a television (TV), a teller machine or a self-service machine, etc., and the embodiment of the present application does not specifically limit it.

[0095] Figure 10 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 10As shown, the electronic device may include: a processor 1010, a communication interface 1020, a memory 1030, and a communication bus 1040, wherein the processor 1010, the communication interface 1020, and the memory 1030 communicate with each other via the communication bus 1040. The processor 1010 may call the logic instructions in the memory 1030 to execute a detection method, which includes: when the electronic device is in the fingerprint recognition mode, the ultrasonic fingerprint module transmits and receives ultrasonic signals through the first working surface, and determines the fingerprint pressed on the display module based on the transmitted and received ultrasonic signals; when the electronic device is in the pressure detection mode, the ultrasonic fingerprint module transmits and receives ultrasonic signals through the second working surface, and determines the pressure pressed on the display module based on the signal strength of the transmitted and received ultrasonic signals. Alternatively, the detection method includes: when the electronic device is in the fingerprint recognition mode, the ultrasonic fingerprint module transmits and receives ultrasonic signals through the first working surface, and determines the fingerprint pressed on the display module based on the transmitted and received ultrasonic signals; when the electronic device is in the pressure detection mode, the ultrasonic fingerprint module transmits and receives ultrasonic signals through the second working surface, and determines the pressure pressed on the display module based on the time difference between transmitting and receiving the ultrasonic signals.

[0096] In addition, the logic instructions in the above-mentioned memory 1030 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0097] On the other hand, the present application also provides a computer program product, which includes a computer program that can be stored on a computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the detection method provided by the above methods. The control method includes: when the electronic device is in the fingerprint recognition mode, the ultrasonic fingerprint module transmits and receives ultrasonic signals through the first working surface, and determines the fingerprint pressed on the display module based on the transmitted and received ultrasonic signals; when the electronic device is in the pressure detection mode, the ultrasonic fingerprint module transmits and receives ultrasonic signals through the second working surface, and determines the pressure pressed on the display module based on the signal strength of the transmitted and received ultrasonic signals. Alternatively, the detection method includes: when the electronic device is in the fingerprint recognition mode, the ultrasonic fingerprint module transmits and receives ultrasonic signals through the first working surface, and determines the fingerprint pressed on the display module based on the transmitted and received ultrasonic signals; when the electronic device is in the pressure detection mode, the ultrasonic fingerprint module transmits and receives ultrasonic signals through the second working surface, and determines the pressure pressed on the display module based on the time difference between the transmitted and received ultrasonic signals.

[0098] In another aspect, the present application also provides a computer-readable storage medium, the computer-readable storage medium including a stored program, wherein when the program is executed, the detection method provided by the above methods is executed, and the control method includes: when the electronic device is in the fingerprint recognition mode, the ultrasonic fingerprint module transmits and receives ultrasonic signals through the first working surface, and determines the fingerprint pressed on the display module based on the transmitted and received ultrasonic signals; when the electronic device is in the pressure detection mode, the ultrasonic fingerprint module transmits and receives ultrasonic signals through the second working surface, and determines the pressure pressed on the display module based on the signal strength of the transmitted and received ultrasonic signals. Alternatively, the detection method includes: when the electronic device is in the fingerprint recognition mode, the ultrasonic fingerprint module transmits and receives ultrasonic signals through the first working surface, and determines the fingerprint pressed on the display module based on the transmitted and received ultrasonic signals; when the electronic device is in the pressure detection mode, the ultrasonic fingerprint module transmits and receives ultrasonic signals through the second working surface, and determines the pressure pressed on the display module based on the time difference between the transmitted and received ultrasonic signals.

[0099] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0100] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, or of course, by hardware. Based on this understanding, the essence of the above technical solution or the part that contributes to the existing technology can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and includes a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or certain parts of the embodiments.

[0101] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0102] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An electronic device, characterized in that: The electronic device comprises: An ultrasonic fingerprint module having a first working surface and a second working surface; A display module, wherein the first working surface of the ultrasonic fingerprint module is arranged in contact with the display module; An elastic member and a support member, wherein the second working surface of the ultrasonic fingerprint module is arranged on the support member through the elastic member, and the elastic member and the support member have different acoustic impedances; The ultrasonic fingerprint module transmits and receives ultrasonic signals through the first working surface to perform fingerprint recognition; the ultrasonic fingerprint module transmits and receives ultrasonic signals through the second working surface to perform pressure sensing detection.

2. The electronic device according to claim 1, wherein The first working surface and the second working surface are arranged on two opposite sides of the ultrasonic fingerprint module.

3. The electronic device according to claim 2, wherein: The ultrasonic fingerprint module includes: Piezoelectric body; a first driving electrode, the first driving electrode being disposed between the piezoelectric body and the display module and being configured to cooperate with the piezoelectric body to transmit and receive ultrasonic signals through the first working surface; A second driving electrode is provided between the piezoelectric body and the elastic member, and is used to cooperate with the piezoelectric body to transmit and receive ultrasonic signals through the second working surface.

4. The electronic device according to claim 3, wherein: The ultrasonic fingerprint module further includes a metal electrode layer, which is arranged between the piezoelectric body and the elastic member. An opening area is provided in the metal electrode layer, and the second driving electrode is arranged in the opening area.

5. The electronic device according to claim 4, characterized in that A plurality of opening areas are provided in the metal electrode layer, and the second driving electrode is provided in each of the opening areas.

6. The electronic device according to claim 3, wherein: The first driving electrode and the second driving electrode are both TFT driving electrodes.

7. The electronic device according to claim 5, wherein: There are a plurality of elastic members, and the second driving electrode in each of the opening areas is arranged on the supporting member via an elastic member.

8. The electronic device according to claim 1, wherein: The display module includes: a pressure-sensitive adhesive layer, a display panel and a cover plate; the pressure-sensitive adhesive layer, the display panel and the cover plate are sequentially stacked on the first working surface of the ultrasonic fingerprint module.

9. A detection method, characterized in that: Applied to the electronic device according to any one of claims 1 to 8, the detection method comprises: When the electronic device is in the fingerprint recognition mode, the ultrasonic fingerprint module transmits and receives ultrasonic signals through the first working surface, and determines the fingerprint pressed on the display module based on the transmitted and received ultrasonic signals; When the electronic device is in the pressure sensing detection mode, the ultrasonic fingerprint module transmits and receives ultrasonic signals through the second working surface, and determines the pressure applied to the display module based on the time difference between transmitting and receiving the ultrasonic signals.

10. A detection method, characterized in that: Applied to the electronic device according to any one of claims 1 to 8, the detection method comprises: When the electronic device is in the fingerprint recognition mode, the ultrasonic fingerprint module transmits and receives ultrasonic signals through the first working surface, and determines the fingerprint pressed on the display module based on the transmitted and received ultrasonic signals; When the electronic device is in the pressure sensing detection mode, the ultrasonic fingerprint module transmits and receives ultrasonic signals through the second working surface, and determines the pressure applied to the display module based on the signal strength of the transmitted and received ultrasonic signals.

Images