CN115661870B - Ultrasonic fingerprint identification method, ultrasonic fingerprint device and electronic equipment - Google Patents
Ultrasonic fingerprint identification method, ultrasonic fingerprint device and electronic equipment Download PDFInfo
- Publication number
- CN115661870B CN115661870B CN202211133200.5A CN202211133200A CN115661870B CN 115661870 B CN115661870 B CN 115661870B CN 202211133200 A CN202211133200 A CN 202211133200A CN 115661870 B CN115661870 B CN 115661870B
- Authority
- CN
- China
- Prior art keywords
- signal
- ultrasonic
- fingerprint
- ultrasonic fingerprint
- sampling windows
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000005070 sampling Methods 0.000 claims abstract description 88
- 238000002604 ultrasonography Methods 0.000 claims description 19
- 238000001514 detection method Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000002615 epidermis Anatomy 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 210000003491 skin Anatomy 0.000 description 1
- 239000004984 smart glass Substances 0.000 description 1
Landscapes
- Image Input (AREA)
Abstract
The application provides an ultrasonic fingerprint identification method, an ultrasonic fingerprint device and electronic equipment, which have better fingerprint identification performance. The method is performed by an ultrasonic fingerprint device disposed below a screen of an electronic device to enable off-screen ultrasonic fingerprint identification, the method comprising: when a finger presses the screen, transmitting ultrasonic signals to the finger, and sequentially collecting ultrasonic fingerprint signals carrying fingerprint information returned by the finger in N sampling windows, wherein the time difference between the initial positions of adjacent sampling windows in the N sampling windows is 1/(N multiplied by f), f is the frequency of the ultrasonic signals, and N is a positive integer greater than 1; and carrying out fingerprint identification according to the ultrasonic fingerprint signals acquired in the N sampling windows.
Description
Technical Field
The embodiment of the application relates to the field of ultrasonic fingerprint, and more particularly relates to an ultrasonic fingerprint identification method, an ultrasonic fingerprint device and electronic equipment.
Background
The ultrasonic fingerprint identification technology is becoming a mainstream fingerprint unlocking scheme gradually due to the advantages of high unlocking speed, high accuracy, simple input, wide application range and the like. In the process of ultrasonic fingerprint identification, the ultrasonic fingerprint device transmits an ultrasonic signal, and the ultrasonic signal reaches the surface of the screen after passing through the medium such as the laminating layer and the screen, is reflected by the finger on the surface of the screen, passes through the lamination of the screen and the like again, and returns to the ultrasonic fingerprint device. Because the reflectivity of the fingerprint valley and the fingerprint ridge of the finger to the ultrasonic signal is different, the ultrasonic fingerprint device collects portable fingerprint information in the echo signal. In addition, the ultrasonic fingerprint device also needs to collect the background signal returned when no finger presses the surface of the screen, and the echo signal carrying the fingerprint information is differed from the background signal not carrying the fingerprint information, so that a clear fingerprint image can be obtained.
Because the background signal cannot be acquired in real time and is usually stored in advance, there may be a difference in acquisition environment between the echo signal acquired during the current fingerprint identification and the stored background signal, for example, the environment temperature is different, so that the time for returning the signal is different, and the definition of the fingerprint image changes after the difference. Therefore, the problem of fingerprint image unclear caused by different signal return time needs to be solved, so as to improve the performance of ultrasonic fingerprint identification.
Disclosure of Invention
The embodiment of the application provides an ultrasonic fingerprint identification method, an ultrasonic fingerprint device and electronic equipment, which have better fingerprint identification performance.
In a first aspect, there is provided a method of ultrasonic fingerprinting, the method being performed by an ultrasonic fingerprinting device disposed below a screen of an electronic device to enable off-screen ultrasonic fingerprinting, the method comprising: when a finger presses the screen, transmitting ultrasonic signals to the finger, and sequentially collecting ultrasonic fingerprint signals carrying fingerprint information returned by the finger in N sampling windows, wherein the time difference between the initial positions of adjacent sampling windows in the N sampling windows is 1/(N×)f)，fN is a positive integer greater than 1 for the frequency of the ultrasonic signal; according to the ultrasonic fingerprint signals acquired in the N sampling windowsAnd (5) fingerprint identification is performed.
In one implementation, the fingerprint identification based on the ultrasonic fingerprint signals collected in the N sampling windows includes: determining an equivalent signal of the ultrasonic fingerprint signal according to the ultrasonic fingerprint signals acquired in the N sampling windows, wherein the equivalent signal of the ultrasonic fingerprint signal is a signal irrelevant to the return time of the ultrasonic fingerprint signal; and carrying out fingerprint identification according to the equivalent signal of the ultrasonic fingerprint signal.
In one implementation, the equivalent signal may be:，/>，/>wherein->Is the nth sampling windownAnd the signal values acquired in the sampling windows are P which is the value of the equivalent signal.
In one implementation, the fingerprint identification based on the equivalent signal of the ultrasonic fingerprint signal includes: acquiring ultrasonic background signals which are acquired in the N sampling windows in sequence and do not carry fingerprint information when no finger presses the screen; and carrying out fingerprint identification according to the difference value between the equivalent signal of the ultrasonic fingerprint signal and the equivalent signal of the ultrasonic background signal.
In one implementation, when n=4, the difference P between the equivalent signal of the ultrasonic background signal and the equivalent signal of the ultrasonic fingerprint signal d The method comprises the following steps: p (P) d =2(A v -A r ) Wherein A is v Maximum amplitude of an ultrasonic fingerprint signal returned for a fingerprint valley of the finger, A r The maximum amplitude of the ultrasonic fingerprint signal returned for the fingerprint ridge of the finger.
In a second aspect, there is provided an ultrasonic fingerprint device disposed below a screen of an electronic apparatus to enable off-screen ultrasonic fingerprint identification, the ultrasonic fingerprint device comprising: the detection module is used for transmitting ultrasonic signals to the finger when the finger presses the screen, and sequentially collecting ultrasonic fingerprint signals carrying fingerprint information returned by the finger in N sampling windows, wherein the time difference between the initial positions of adjacent sampling windows in the N sampling windows is 1/(N×)f)，fN is a positive integer greater than 1 for the frequency of the ultrasonic signal; and the processing module is used for carrying out fingerprint identification according to the ultrasonic fingerprint signals acquired in the N sampling windows.
In one implementation, the processing module is specifically configured to: determining an equivalent signal of the ultrasonic fingerprint signal according to the ultrasonic fingerprint signals acquired in the N sampling windows, wherein the equivalent signal of the ultrasonic fingerprint signal is a signal irrelevant to the return time of the ultrasonic fingerprint signal; and carrying out fingerprint identification according to the equivalent signal of the ultrasonic fingerprint signal.
In one implementation, the equivalent signal of the ultrasonic fingerprint signal is:，，/>wherein->Is the nth sampling windownAnd the signal values acquired in the sampling windows are P which is the value of the equivalent signal.
In one implementation, the processing module is specifically configured to: acquiring ultrasonic background signals which are acquired in the N sampling windows in sequence and do not carry fingerprint information when no finger presses the screen; and carrying out fingerprint identification according to the difference value between the equivalent signal of the ultrasonic fingerprint signal and the equivalent signal of the ultrasonic background signal.
In one implementation, n=4, the difference P between the equivalent signal of the ultrasound background signal and the equivalent signal of the ultrasound fingerprint signal d The method comprises the following steps: p (P) d =2(A v -A r ) Wherein A is v Maximum amplitude of an ultrasonic fingerprint signal returned for a fingerprint valley of the finger, A r The maximum amplitude of the ultrasonic fingerprint signal returned for the fingerprint ridge of the finger.
In a third aspect, an electronic device is provided, comprising: a screen; and an ultrasound fingerprint apparatus as described in the second aspect or any possible implementation manner of the second aspect, the ultrasound fingerprint apparatus being disposed below a screen of the electronic device to enable off-screen ultrasound fingerprint identification.
Based on the technical scheme, the problem that fingerprint images are not clear due to different signal return time is solved by collecting signals in different sampling windows. Compared with the method that only one sampling window is arranged, after the plurality of sampling windows are arranged for signal acquisition, the signals acquired in the plurality of sampling windows can be processed, variables related to the signal return time are eliminated, and therefore the change of the definition of the fingerprint image caused by different signal return times is avoided, and the performance of ultrasonic fingerprint identification is improved.
Drawings
Fig. 1 is a schematic diagram of the principle of ultrasonic fingerprinting.
Fig. 2 is a schematic flow chart of a method of ultrasonic fingerprinting in an embodiment of the present application.
Fig. 3 is a schematic illustration of the difference between finger ridges and finger valleys with and without the present application.
Fig. 4 is a schematic block diagram of an ultrasonic fingerprint apparatus of an embodiment of the present application.
Fig. 5 is a schematic block diagram of an electronic device of an embodiment of the present application.
Detailed Description
The technical solutions in the present application will be described below with reference to the accompanying drawings.
The ultrasonic fingerprint device acquires a fingerprint image of a finger by transmitting and receiving an ultrasonic signal returned from the finger. The ultrasonic signal can penetrate through the skin epidermis layer and is less influenced by the details of the fingerprint surface, so that the ultrasonic fingerprint device has better recognition rate under the scenes of stains, wet hands and the like, and has stronger anti-counterfeiting characteristic.
Fig. 1 is a schematic diagram of the principle of ultrasonic fingerprint recognition. As shown in fig. 1, an ultrasonic signal P (a 0 ) Passes through the screen 200 to the upper surface thereof, and the ultrasonic signal P (a) is generated due to the difference in acoustic impedance between the skin and the screen 200 and between the air and the screen 200 0 ) Will be reflected to form echo signal P (A 1 ). The finger 100 includes fingerprint ridges (hereinafter also referred to simply as ridges) 110 and fingerprint valleys (hereinafter also referred to simply as valleys) 120, when the finger 100 presses the screen 200, the ridges 110 and the screen 200 are in contact with each other, and an air gap exists between the valleys 120 and the screen 200, so that the signal intensity returned from the positions of the ridges 110 is different from the signal intensity returned from the positions of the valleys 120, and a fingerprint image of the finger 100 can be obtained by using the difference, thereby realizing ultrasonic fingerprint recognition.
In general, the intensity variation of the ultrasonic signal satisfies a sine rule or a cosine rule, which may be a sine wave signal, a cosine wave signal, or a combination of a sine wave signal and a cosine wave signal, and hereinafter, the ultrasonic signal is taken as an example of the cosine signal.
The ultrasonic signal emitted by the ultrasonic fingerprint apparatus 300 is expressed as formula (1):
（1）；
where a is the maximum amplitude of the ultrasonic signal, B is the fixed offset caused by the ultrasonic fingerprint device 300 itself, P is the amplitude of the ultrasonic signal at time t,fis the frequency of the ultrasonic signal.
From equation (1), echo signals of the ridges 110 and valleys 120 can be obtained, which are expressed as equation (2) and equation (3), respectively:
（2）；
（3）；
wherein,amplitude of echo signal for ridge 110 at time t, +.>Amplitude of echo signal at time t for valley 120, +.>Is the maximum amplitude of the echo signal of ridge 110, < >>Is the maximum amplitude of the echo signal at the valley 120.
Both the echo signal of the ridge 110 and the echo signal of the valley 120 pass through the screen 200 of the same thickness, so the time t is the same.
In the embodiment of the present application, the echo signal acquired by the ultrasonic fingerprint device 300 when the finger is not pressing the screen 200 is referred to as an ultrasonic background signal; the echo signal acquired by the ultrasonic fingerprint device 300 when the finger 100 presses the screen 200 is referred to as an ultrasonic fingerprint signal.
The ultrasound fingerprint apparatus 300 acquires echo signals within a certain sampling window, assuming that the starting moment of the sampling window is to increase the time t based on the signal return time t 0 I.e. the starting moment of the sampling window is，/>I.e. the time that the ultrasonic signal takes from transmission to being received, alsoKnown as time of flight (flight). The length of the sampling window is set to be infinitely small, the +.>Amplitude of echo signal at time. Because the ultrasonic background signal cannot be acquired in real time, the ultrasonic background signal is usually stored in advance or acquired after the last fingerprint identification is finished. In fingerprint recognition, the ultrasonic fingerprint signal returned by the finger 100 is acquired in the sampling window when the finger 100 presses the screen 200, and then a difference between the ultrasonic fingerprint signal and the stored ultrasonic background signal is required, so as to obtain the difference between the ridges 110 and the valleys 120. Wherein, the subtraction of the portion of the ultrasonic background signal and the ultrasonic fingerprint signal corresponding to the valley 120 is 0, and the subtraction of the portion of the ultrasonic background signal and the ultrasonic fingerprint signal corresponding to the ridge 110 is equivalent to the subtraction of the ridge 110 from the valley 120, for example, as shown in formula (4):
（4）；
wherein,representing the difference between ridges 110 and valleys 120.
When (when)When it is, it can get +.>Maximum value of (i.e.)>Thereby obtaining a clearer fingerprint image.
Because the ultrasonic background signals are usually stored in advance, there may be a difference in acquisition environment between the ultrasonic fingerprint signals acquired during the current fingerprint identification and the stored ultrasonic background signals, for example, the environment temperature is different, and the sound velocity is affected by the temperature change, so that the signal return time is different; in addition, the thickness of the patch film on the screen 200 may be different, and the like, which may also cause the signal return time to be different.
Based on the formula (2) and the formula (3), whenAt this time, the ultrasonic background signal acquired by the ultrasonic fingerprint apparatus 300 is +.>The ultrasonic fingerprint signal acquired by the ultrasonic fingerprint device 300 corresponds to the ridge 110 in the form ofThe valley 120 corresponds to +.>，/>Is the time offset caused by the change of the temperature when the ultrasonic fingerprint signal is acquired at present relative to the temperature when the ultrasonic background signal is acquired at present. Thus, based on equation (4), the difference between the ridges 110 and valleys 120. It can be seen that the sharpness of the fingerprint image changes with temperature.
The application aims at providing an ultrasonic fingerprint identification scheme, which solves the problem of fingerprint image unclear caused by different signal return time by collecting signals in different sampling windows.
Fig. 2 shows a schematic flow chart of a method of ultrasound fingerprinting according to an embodiment of the present application. As shown in fig. 2, the method 400 may be performed by an ultrasonic fingerprint device 300, the ultrasonic fingerprint device 300 being disposed below the screen 200 of the electronic device to enable off-screen ultrasonic fingerprint recognition. As shown in fig. 2, method 400 includes some or all of the following steps.
In step 410, when the finger 100 presses the screen 200, an ultrasonic signal is transmitted to the finger 100, and the ultrasonic fingerprint signal carrying fingerprint information returned by the finger 100 is collected in N sampling windows in sequence, where N is a positive integer greater than 1.
In step 420, fingerprint identification is performed based on the ultrasonic fingerprint signals collected in the N sampling windows.
Wherein the time difference between the initial positions of adjacent sampling windows in the N sampling windows can be according to the number N of the sampling windows and the frequency of the ultrasonic signalfAnd (5) determining. For example, the time difference between the start positions of adjacent sampling windows among the N sampling windows is 1/(N×)f) Correspondingly, the phase difference of the ultrasonic fingerprint signals collected in the adjacent sampling windows in the N sampling windows is 2 pi/N.
The duration of the N sampling windows should be the same and should be as small as possible.
Compared with the method that only one sampling window is arranged, after the plurality of sampling windows are arranged for signal acquisition, the signals acquired in the plurality of sampling windows can be processed, variables related to the signal return time are eliminated, accordingly, the change of definition of fingerprint images caused by different signal return times is avoided, and the performance of ultrasonic fingerprint identification is improved.
For example, in step 420, an equivalent signal of the ultrasonic fingerprint signal may be determined based on the ultrasonic fingerprint signals collected in the N sampling windows, and fingerprint identification may be performed based on the equivalent signal. Wherein the equivalent signal of the ultrasonic fingerprint signal is a signal that is uncorrelated with the return time of the ultrasonic fingerprint signal.
Let the starting time of the first sampling window of the N sampling windows be t 0 The starting time of the N sampling windows is t in turn 0 、t 0 +1/(N×f)、t 0 +2/(N×f)、t 0 +3/(N×f)、……、t 0 +(N-1)/(N×f) Here for t 0 And are not limited. The equivalent signal of the ultrasonic fingerprint signal may be obtained by performing corresponding data processing on the ultrasonic fingerprint signals collected in the N sampling windows, for example, as shown in the formulas (5) to (7):
（5）；
（6）；
（7）；
wherein,is the N sampling windowsnThe value of the ultrasonic fingerprint signal collected in the sampling window, and P is the value of the equivalent signal of the ultrasonic fingerprint signal.
Similarly, when the finger 100 does not press the screen 200, the ultrasonic background signal is acquired in the above manner, that is, the ultrasonic background signal which does not carry fingerprint information is sequentially acquired in N sampling windows, and the ultrasonic background signal acquired in the N sampling windows is stored, or an equivalent signal of the ultrasonic background signal is stored.
The equivalent signal of the ultrasonic background signal can be determined based on the above formulas (5) to (7) as well, in which case, in formulas (5) to (7), the acquired signal is obtainedIs the N sampling windowsnThe value of the ultrasonic background signal acquired in each sampling window is obtainedPIs the value of the equivalent signal of the ultrasound background signal. The process of calculating the equivalent signal of the ultrasonic background signal is similar to that of the ultrasonic fingerprint signal, and for brevity, the description is omitted here.
Thus, in step 420, fingerprint identification may be performed based on the difference between the equivalent signal of the ultrasonic fingerprint signal and the equivalent signal of the ultrasonic background signal.
In the following, taking n=4 as an example, how to cancel the variable related to the signal return time in the ultrasonic fingerprint signal is described in detail.
Let n=4 and the start time of the first sampling window be t 0 Then the second sampling windowThe starting time of the port, the third sampling window and the fourth sampling window is t respectively 0 +1/(4f)、t 0 +1/(2f) And t 0 +3/(4f). Substituting the starting moments of the 4 sampling windows into the formula (1) to obtain ultrasonic fingerprint signals acquired by the 4 sampling windows as shown in the formulas (8) to (11) respectively:
（8）；
（9）；
（10）；
（11）；
substituting the formulas (8) to (11) into the formulas (6) and (7) can result in:
（12）；
（13）；
substituting equation (12) and equation (13) into equation (5) can result in an equivalent signal:
（14）。
from equation (14), it can be seen that the equivalent signal P is twice the amplitude a, which is only related to the amplitude a, and not to time.
Thus, after the equivalent signal of the ultrasonic fingerprint signal and the equivalent signal of the ultrasonic background signal are obtained based on the above process, the equivalent signal of the ultrasonic fingerprint signal and the equivalent signal of the ultrasonic background signal are subjected to difference, and the obtained difference is:
（15）。
it can be seen that when fingerprint identification is performed using the ultrasonic fingerprint signals collected in the 4 sampling windows, the difference between the equivalent signal of the ultrasonic background signal and the equivalent signal of the ultrasonic fingerprint signalIs P d =2(A v -A r ) Wherein A is v Maximum amplitude, a, of the ultrasonic fingerprint signal returned for valley 120 r The maximum amplitude of the ultrasonic fingerprint signal returned for the ridge 110.
Corresponding to each pixelAll can be obtained by the above-mentioned method. By the above method, the difference between ridge 110 and valley 120 ∈>Is an amount independent of the signal return time, so that the problem of unclear fingerprint images caused by different signal return times can be solved.
According to the method and the device for acquiring the multi-frame data of the echo signals, the multi-frame data of the echo signals are acquired through configuration of different sampling windows, the multi-frame data are processed by adopting corresponding data tools, and the maximum amplitude of the echo signals is obtained, so that the influence caused by the return time change of the echo signals is avoided, and the definition of fingerprint images is improved.
FIG. 3 shows the difference between ridges 110 and valleys 120 with and without the present applicationIn contrast, fig. 3 is shown with n=4, +.>=10，/>=6, phase of ultrasound fingerprint signal +.>As an example. Curve 301 is the difference between ridge 110 and valley 120 without applying the scheme of the present application +.>Along with->The change of (i.e.)>Over time->Is a change in conditions of (2); curve 302 is the difference between ridge 110 and valley 120 when the scheme of the present application is applied +.>Along with->The change of (i.e.)>Over time->Is a variation of (2).
When the scheme of the present application is not adopted, it can be seen from the curve 301 that in some cases it may lead toA value of 0, i.e., the difference between the ultrasonic fingerprint signals returned by ridges 110 and valleys 120 is 0, indicates that no fingerprint is present. Whereas, with the solution according to the present application, it can be seen from curve 302 that +>The variation of (a) does not affect the difference in the ultrasound fingerprint signals returned by the ridges 110 and valleys 120,the difference value is always kept at a fixed level, and the definition of the fingerprint image is ensured. Furthermore, as can be seen from fig. 3, due to P d =2(A v -A r ) I.e. +.>Is the amplitude difference (A v -A r ) And thus increases the difference between the ridges 110 and the valleys 120, further improving the sharpness of the fingerprint image.
The present application further provides an ultrasonic fingerprint device 300, as shown in fig. 4, where the ultrasonic fingerprint device 300 is disposed below the screen 200 of the electronic device to implement an under-screen ultrasonic fingerprint identification, and the ultrasonic fingerprint device 300 includes a detection module 310 and a processing module 320. The detection module 310 may include a signal transmitting unit for transmitting an ultrasonic signal and a signal collecting unit for collecting a returned echo signal.
The detection module 310 is configured to transmit an ultrasonic signal to the finger 100 when the finger 100 presses the screen 200, and sequentially collect the ultrasonic fingerprint signals carrying fingerprint information returned by the finger 100 in N sampling windows, where a time difference between initial positions of adjacent sampling windows in the N sampling windows is 1/(n×)f)，fN is a positive integer greater than 1 for the frequency of the ultrasonic signal;
the processing module 320 is configured to perform fingerprint identification according to the ultrasonic fingerprint signals collected in the N sampling windows.
In one implementation, the processing module 320 is specifically configured to: determining an equivalent signal of the ultrasonic fingerprint signal according to the ultrasonic fingerprint signals collected in the N sampling windows, wherein the equivalent signal of the ultrasonic fingerprint signal is a signal irrelevant to the return time of the ultrasonic fingerprint signal; fingerprint identification is performed according to the equivalent signal of the ultrasonic fingerprint signal.
In one implementation, the equivalent signal of the ultrasonic fingerprint signal is:，，/>wherein->Is the N sampling windowsnAnd the signal values acquired in the sampling windows are P equivalent signal values.
In one implementation, the processing module 320 is specifically configured to: acquiring ultrasonic background signals which are acquired in N sampling windows in sequence and do not carry fingerprint information when no finger 100 presses the screen 200; and carrying out fingerprint identification according to the difference value between the equivalent signal of the ultrasonic fingerprint signal and the equivalent signal of the ultrasonic background signal.
In one implementation, n=4, the difference P between the equivalent signal of the ultrasound background signal and the equivalent signal of the ultrasound fingerprint signal d The method comprises the following steps: p (P) d =2(A v -A r ) Wherein A is v Maximum amplitude of an ultrasonic fingerprint signal returned for a fingerprint valley of the finger, A r The maximum amplitude of the ultrasonic fingerprint signal returned for the fingerprint ridge of the finger.
It should be appreciated that the specific details of the ultrasound fingerprint apparatus 300 may be referred to the foregoing description of the ultrasound fingerprint identification method 400, and for brevity, will not be repeated here.
As shown in fig. 5, the present application further provides an electronic device 500, where the electronic device 500 includes a screen 200; and the ultrasonic fingerprint apparatus 300 described above. The ultrasonic fingerprint device 300 is disposed below the screen 200, thereby implementing the under-screen ultrasonic fingerprint recognition.
By way of example, and not limitation, the electronic device in the embodiments of the present application may be a portable or mobile computing device such as a terminal device, a mobile phone, a tablet computer, a notebook computer, a desktop computer, a game device, an in-vehicle electronic device, or a wearable smart device, and other electronic devices such as an electronic database, an automobile, and a bank automated teller machine (Automated Teller Machine, ATM). The wearable intelligent device comprises devices which are full in function, large in size and capable of achieving complete or partial functions independently of a smart phone, such as a smart watch or smart glasses, and devices which are only focused on certain application functions and are required to be matched with other devices such as the smart phone, such as various types of smart bracelets, smart jewelry and the like for physical sign monitoring.
It should be noted that, on the premise of no conflict, the embodiments described in the present application and/or the technical features in the embodiments may be arbitrarily combined with each other, and the technical solutions obtained after the combination should also fall into the protection scope of the present application.
The system, apparatus and method disclosed in the embodiments of the present application may be implemented in other manners. For example, some features of the method embodiments described above may be omitted or not performed. The above-described apparatus embodiments are merely illustrative, and the division of units is merely one logical function division, and there may be another division manner in actual implementation, and a plurality of units or components may be combined or may be integrated into another system. In addition, the coupling between the elements or the coupling between the elements may be direct or indirect, including electrical, mechanical, or other forms of connection.
It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working processes and technical effects of the apparatus and device described above may refer to corresponding processes and technical effects in the foregoing method embodiments, which are not described in detail herein.
It should be understood that the specific examples in the embodiments of the present application are only for helping those skilled in the art to better understand the embodiments of the present application, and not limit the scope of the embodiments of the present application, and those skilled in the art may make various improvements and modifications based on the above embodiments, and these improvements or modifications fall within the protection scope of the present application.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (5)
1. A method of ultrasonic fingerprinting, the method being performed by an ultrasonic fingerprinting device disposed below a screen of an electronic device to enable off-screen ultrasonic fingerprinting, the method comprising:
when a finger presses the screen, transmitting ultrasonic signals to the finger, and sequentially collecting ultrasonic fingerprint signals carrying fingerprint information returned by the finger in N sampling windows, wherein the time difference between the initial positions of adjacent sampling windows in the N sampling windows is 1/(N×)f)，fN is a positive integer greater than 1 for the frequency of the ultrasonic signal;
fingerprint identification is carried out according to the ultrasonic fingerprint signals collected in the N sampling windows;
wherein, fingerprint identification is carried out according to the ultrasonic fingerprint signals collected in the N sampling windows, and the method comprises the following steps:
determining an equivalent signal of the ultrasonic fingerprint signal according to the ultrasonic fingerprint signals acquired in the N sampling windows, wherein the equivalent signal of the ultrasonic fingerprint signal is a signal irrelevant to the return time of the ultrasonic fingerprint signal;
fingerprint identification is carried out according to the equivalent signal of the ultrasonic fingerprint signal;
wherein, the equivalent signal is:
，/>，/>，
wherein,is the nth sampling windownThe signal values collected in the sampling windows, P is the value of the equivalent signal,
the fingerprint identification according to the equivalent signal of the ultrasonic fingerprint signal comprises the following steps:
acquiring ultrasonic background signals which are acquired in the N sampling windows in sequence and do not carry fingerprint information when no finger presses the screen;
and carrying out fingerprint identification according to the difference value between the equivalent signal of the ultrasonic fingerprint signal and the equivalent signal of the ultrasonic background signal.
2. The method according to claim 1, characterized in that N = 4, the difference P between the equivalent signal of the ultrasound background signal and the equivalent signal of the ultrasound fingerprint signal d The method comprises the following steps:
P d =2(A v -A r ) Wherein A is v Maximum amplitude of the ultrasonic fingerprint signal returned for the fingerprint valley of the finger, A r The maximum amplitude of the ultrasonic fingerprint signal returned for the fingerprint ridge of the finger.
3. An ultrasonic fingerprint device, characterized in that the ultrasonic fingerprint device is arranged below a screen of an electronic device to realize an under-screen ultrasonic fingerprint identification, the ultrasonic fingerprint device comprising:
the detection module is used for transmitting ultrasonic signals to the finger when the finger presses the screen, and sequentially collecting ultrasonic fingerprint signals carrying fingerprint information returned by the finger in N sampling windows, wherein the time difference between the initial positions of adjacent sampling windows in the N sampling windows is 1/(N×)f)，fN is a positive integer greater than 1 for the frequency of the ultrasonic signal;
the processing module is used for carrying out fingerprint identification according to the ultrasonic fingerprint signals collected in the N sampling windows,
the processing module is specifically configured to:
determining an equivalent signal of the ultrasonic fingerprint signal according to the ultrasonic fingerprint signals acquired in the N sampling windows, wherein the equivalent signal of the ultrasonic fingerprint signal is a signal irrelevant to the return time of the ultrasonic fingerprint signal;
fingerprint identification is carried out according to the equivalent signal of the ultrasonic fingerprint signal;
wherein, the equivalent signal of the ultrasonic fingerprint signal is:
，/>，/>，
wherein,is the nth sampling windownThe signal values collected in the sampling windows, P is the value of the equivalent signal,
the processing module is specifically configured to:
acquiring ultrasonic background signals which are acquired in the N sampling windows in sequence and do not carry fingerprint information when no finger presses the screen;
and carrying out fingerprint identification according to the difference value between the equivalent signal of the ultrasonic fingerprint signal and the equivalent signal of the ultrasonic background signal.
4. An ultrasound fingerprint apparatus as claimed in claim 3, wherein N = 4, the difference P between the equivalent signal of the ultrasound background signal and the equivalent signal of the ultrasound fingerprint signal d The method comprises the following steps:
P d =2(A v -A r ) Wherein A is v Maximum amplitude of ultrasonic fingerprint signal returned for fingerprint valleys of the fingerValue, A r The maximum amplitude of the ultrasonic fingerprint signal returned for the fingerprint ridge of the finger.
5. An electronic device, comprising:
a screen; the method comprises the steps of,
the ultrasonic fingerprint device of claim 3 or 4, disposed below the screen to enable off-screen ultrasonic fingerprint identification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211133200.5A CN115661870B (en) | 2022-09-16 | 2022-09-16 | Ultrasonic fingerprint identification method, ultrasonic fingerprint device and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211133200.5A CN115661870B (en) | 2022-09-16 | 2022-09-16 | Ultrasonic fingerprint identification method, ultrasonic fingerprint device and electronic equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115661870A CN115661870A (en) | 2023-01-31 |
| CN115661870B true CN115661870B (en) | 2024-03-15 |
Family
ID=84984208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211133200.5A Active CN115661870B (en) | 2022-09-16 | 2022-09-16 | Ultrasonic fingerprint identification method, ultrasonic fingerprint device and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115661870B (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102549451A (en) * | 2009-07-20 | 2012-07-04 | 罗伯特·博世有限公司 | Ultrasonic measurement apparatus and method for evaluating an ultrasonic signal |
| CN110287919A (en) * | 2019-06-28 | 2019-09-27 | Oppo广东移动通信有限公司 | Ultrasonic fingerprint recognition methods and relevant device |
| CN110579271A (en) * | 2019-09-24 | 2019-12-17 | 成都大超科技有限公司 | Acoustic impedance calibration method based on ultrasonic waves, ultrasonic sensor, ultrasonic fingerprint identification module and electronic equipment |
| CN111680663A (en) * | 2020-06-19 | 2020-09-18 | 京东方科技集团股份有限公司 | Signal detection circuit, signal detection method, fingerprint identification device and display equipment |
| CN111738227A (en) * | 2020-07-31 | 2020-10-02 | 深圳市汇顶科技股份有限公司 | Ultrasonic fingerprint identification device and electronic equipment |
| CN112070017A (en) * | 2020-09-08 | 2020-12-11 | 深圳市汇顶科技股份有限公司 | Ultrasonic fingerprint identification method, device, equipment and storage medium |
| WO2020253588A1 (en) * | 2019-06-20 | 2020-12-24 | 京东方科技集团股份有限公司 | Fingerprint recognition device, display panel, display device, and fingerprint recognition method |
| CN112131905A (en) * | 2019-06-24 | 2020-12-25 | Oppo广东移动通信有限公司 | Ultrasonic fingerprint identification method and device, storage medium and electronic equipment |
| WO2021071146A1 (en) * | 2019-10-07 | 2021-04-15 | 삼성전자 주식회사 | Electronic device comprising ultrasonic sensor and operation method therefor |
| WO2022051907A1 (en) * | 2020-09-08 | 2022-03-17 | 深圳市汇顶科技股份有限公司 | Ultrasonic fingerprint recognition method, apparatus and device, and storage medium |
| CN114758367A (en) * | 2022-04-29 | 2022-07-15 | 深圳市汇顶科技股份有限公司 | Fingerprint identification device and electronic equipment |
| CN114926867A (en) * | 2022-05-10 | 2022-08-19 | 维沃移动通信有限公司 | Detection method and electronic equipment |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10067229B2 (en) * | 2015-09-24 | 2018-09-04 | Qualcomm Incorporated | Receive-side beam forming for an ultrasonic image sensor |
| WO2017091663A1 (en) * | 2015-11-23 | 2017-06-01 | Jensen Eric Dean | Fingerprint reader |
| CN106446817B (en) * | 2016-09-18 | 2018-03-20 | 京东方科技集团股份有限公司 | Fingerprint recognition device, touch display panel and fingerprint recognition device driving method |
| US10489627B2 (en) * | 2017-04-28 | 2019-11-26 | The Board Of Trustees Of The Leland Stanford Junior University | Acoustic biometric touch scanner |
| US11151355B2 (en) * | 2018-01-24 | 2021-10-19 | Invensense, Inc. | Generation of an estimated fingerprint |
| CN108537179B (en) * | 2018-04-12 | 2021-01-26 | 京东方科技集团股份有限公司 | Fingerprint identification unit, fingerprint identification method and fingerprint identification device |
-
2022
- 2022-09-16 CN CN202211133200.5A patent/CN115661870B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102549451A (en) * | 2009-07-20 | 2012-07-04 | 罗伯特·博世有限公司 | Ultrasonic measurement apparatus and method for evaluating an ultrasonic signal |
| WO2020253588A1 (en) * | 2019-06-20 | 2020-12-24 | 京东方科技集团股份有限公司 | Fingerprint recognition device, display panel, display device, and fingerprint recognition method |
| WO2020259304A1 (en) * | 2019-06-24 | 2020-12-30 | Oppo广东移动通信有限公司 | Ultrasonic fingerprint recognition method and apparatus, storage medium and electronic device |
| CN112131905A (en) * | 2019-06-24 | 2020-12-25 | Oppo广东移动通信有限公司 | Ultrasonic fingerprint identification method and device, storage medium and electronic equipment |
| CN110287919A (en) * | 2019-06-28 | 2019-09-27 | Oppo广东移动通信有限公司 | Ultrasonic fingerprint recognition methods and relevant device |
| CN110579271A (en) * | 2019-09-24 | 2019-12-17 | 成都大超科技有限公司 | Acoustic impedance calibration method based on ultrasonic waves, ultrasonic sensor, ultrasonic fingerprint identification module and electronic equipment |
| WO2021071146A1 (en) * | 2019-10-07 | 2021-04-15 | 삼성전자 주식회사 | Electronic device comprising ultrasonic sensor and operation method therefor |
| CN111680663A (en) * | 2020-06-19 | 2020-09-18 | 京东方科技集团股份有限公司 | Signal detection circuit, signal detection method, fingerprint identification device and display equipment |
| CN111738227A (en) * | 2020-07-31 | 2020-10-02 | 深圳市汇顶科技股份有限公司 | Ultrasonic fingerprint identification device and electronic equipment |
| CN112070017A (en) * | 2020-09-08 | 2020-12-11 | 深圳市汇顶科技股份有限公司 | Ultrasonic fingerprint identification method, device, equipment and storage medium |
| WO2022051907A1 (en) * | 2020-09-08 | 2022-03-17 | 深圳市汇顶科技股份有限公司 | Ultrasonic fingerprint recognition method, apparatus and device, and storage medium |
| CN114758367A (en) * | 2022-04-29 | 2022-07-15 | 深圳市汇顶科技股份有限公司 | Fingerprint identification device and electronic equipment |
| CN114926867A (en) * | 2022-05-10 | 2022-08-19 | 维沃移动通信有限公司 | Detection method and electronic equipment |
Non-Patent Citations (4)
| Title |
|---|
| "基于TFT薄膜晶体管的超声波指纹识别技术研究";尚飞;中国博士学位论文全文数据库（工程科技Ⅰ辑）(第2022年第01期);B020-387 * |
| "超声检测进行气体绝缘组合电器典型绝缘缺陷识别";司文荣;黄华;傅晨钊;李彦明;;高压电器(第12期);第11-18页 * |
| 基于邻域相关性进行指纹判别的方法;裴育;;电脑知识与技术(2013年第10期);第2434-2437页 * |
| 手机操作系统中智能化技术运用研究;陈帅;;自动化与仪器仪表(2016年第04期);第27-28页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115661870A (en) | 2023-01-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Sami et al. | Spying with your robot vacuum cleaner: eavesdropping via lidar sensors | |
| US10410034B2 (en) | Ultrasonic biometric system with harmonic detection | |
| CN106068515B (en) | Multi-spectral ultrasound imaging | |
| US10503948B2 (en) | Multi-spectral ultrasonic imaging | |
| CN115311695B (en) | Ultrasonic fingerprint identification method, ultrasonic fingerprint device and electronic equipment | |
| US11182587B2 (en) | Ultrasonic fingerprint sensor with low-frequency vibration source | |
| US11087109B1 (en) | Apparatus and method for ultrasonic fingerprint and force sensing | |
| US11281881B2 (en) | Device including an ultrasonic fingerprint sensor and a coulomb force apparatus | |
| CN114758367A (en) | Fingerprint identification device and electronic equipment | |
| WO2024045500A1 (en) | Ultrasonic fingerprint identification method, ultrasonic fingerprint apparatus and electronic device | |
| TW202309519A (en) | Ultrasonic sensor system with higher-frequency and lower-frequency areas | |
| CN115661870B (en) | Ultrasonic fingerprint identification method, ultrasonic fingerprint device and electronic equipment | |
| US11062010B2 (en) | Liveness sensing and authentication with an ultrasonic sensor system | |
| EP4357947A2 (en) | Fingerprint sensor configured for avoidance of latent fingerprints | |
| US20220004728A1 (en) | Multiple-frequency ultrasonic sensor system | |
| CN112070017B (en) | Ultrasonic fingerprint identification method, device, equipment and storage medium | |
| Maltoni et al. | Fingerprint Sensing | |
| US11625955B1 (en) | Fingerprint sensor with force or pressure feedback | |
| US11087107B2 (en) | Ultrasonic sensor with bi-poled or uni-poled transmitter/receiver | |
| WO2024163057A1 (en) | Ultrasonic sensor system and multi-layer stiffener for foldable display | |
| CN115239934A (en) | Material class detection method, electronic device and computer readable medium | |
| CN114429768A (en) | Training method, device, equipment and storage medium for speaker log model |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240826 Address after: 51 Science Park Road, Aries Tower # 04-22, Singapore Patentee after: Huike (Singapore) Holdings Private Ltd. Country or region after: Singapore Address before: 13 / F, block B, Tengfei Industrial Building, Futian Free Trade Zone, Shenzhen, Guangdong 518045 Patentee before: SHENZHEN GOODIX TECHNOLOGY Co.,Ltd. Country or region before: China |