CN113343800B - Fingerprint touch identification module, fingerprint touch identification method and electronic equipment - Google Patents
Fingerprint touch identification module, fingerprint touch identification method and electronic equipment Download PDFInfo
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- CN113343800B CN113343800B CN202110572962.4A CN202110572962A CN113343800B CN 113343800 B CN113343800 B CN 113343800B CN 202110572962 A CN202110572962 A CN 202110572962A CN 113343800 B CN113343800 B CN 113343800B
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Abstract
The invention relates to the technical field of ultrasonic fingerprint identification, which comprises a fingerprint touch identification module and a fingerprint touch identification method, wherein the fingerprint touch identification module can start a corresponding fingerprint touch identification area to perform fingerprint detection and obtain data based on a finger touch position after detecting the finger touch position, and further process the data based on the obtained data to obtain a corresponding finger fingerprint image. A plurality of fingerprint touch-control identification districts based on the subregion sets up need not additionally to dispose other detection module groups, can realize large tracts of land fingerprint identification signal, can also make the capacitance value of inserting in the circuit at every turn in resonance range to guarantee voltage stability and improve its emission efficiency in fingerprint identification. The invention also provides electronic equipment which can meet the requirements of miniaturization and large-area ultrasonic fingerprint identification.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of ultrasonic fingerprint identification, in particular to a fingerprint touch identification module, a fingerprint touch identification method and electronic equipment.
[ background of the invention ]
Along with the fingerprint touch-control identification module obtains more and more extensive application in electronic product, current fingerprint touch-control identification module is difficult to satisfy the drive demand of large tracts of land fingerprint touch-control identification module. As the ultrasonic transmitting circuit provided in fig. 1, in the prior art, the ultrasonic transmitting circuit employs a resonant circuit, and if the area of the fingerprint touch recognition module is increased too much, the capacitance C is increased, and meanwhile, the capacitance voltage is continuously decreased, and the transmitting efficiency is reduced. Therefore, it is desirable to provide a novel fingerprint touch recognition module structure capable of meeting large-area detection.
[ summary of the invention ]
In order to overcome the defect that the prior art cannot meet the content detected by a large-area fingerprint touch identification module, the invention provides the fingerprint touch identification module, a fingerprint touch identification method and electronic equipment.
In order to solve the technical problems, the invention provides the following technical scheme: a fingerprint touch control identification module comprises a plurality of fingerprint touch control identification areas based on an ultrasonic detection principle, a control unit and a plurality of switches, wherein the control unit is connected with the switches in parallel and is electrically connected with the switches at the same time and independently controls the fingerprint touch control identification areas to be started at the same time when touch control position detection is carried out, and controls the fingerprint touch control identification areas corresponding to touch positions to carry out fingerprint identification after the touch positions are determined;
the fingerprint touch control identification area comprises two electrode layers and a piezoelectric layer, the two electrode layers are arranged on two opposite surfaces of the piezoelectric layer respectively and are at least provided with a plurality of electrode blocks, one electrode block is led out to the control unit through one switch, and the switches connected with the electrode blocks of the same electrode layer are connected to the control unit in parallel.
Preferably, the switch comprises a TFT switching tube.
Preferably, the electrode layer close to the surface to be touched is a whole conductive layer, and the electrode layer far away from the surface to be touched is the electrode blocks distributed in an array.
In order to solve the technical problems, the invention also provides the following technical scheme: a fingerprint touch control identification method is carried out on the basis of the fingerprint touch control identification module, and comprises the following steps: the parallel switches control the multiple fingerprint touch control identification areas to be started simultaneously when the touch control positions are detected, and control the fingerprint touch control identification area corresponding to the touch position to perform fingerprint identification after the touch position is determined;
the fingerprint touch control identification area comprises two electrode layers and a piezoelectric layer, the two electrode layers are arranged on two opposite surfaces of the piezoelectric layer respectively and are at least provided with a plurality of electrode blocks, one electrode block is led out to the control unit through one switch, and the switches connected with the electrode blocks of the same electrode layer are connected to the control unit in parallel.
Preferably, the detecting the finger touch position includes detecting the finger touch position by capacitance, and includes: acquiring original static parameters corresponding to the fingerprint touch identification module in a non-working state; when detecting that a finger touches the fingerprint touch identification module, controlling each fingerprint touch identification area to start; static parameter scanning is carried out on all fingerprint touch identification areas; comparing the stored original static parameters based on a capacitance imaging principle, and outputting a comparison result; and determining the finger touch position based on the comparison result.
Preferably, the detecting the finger touch position includes detecting the finger touch position by ultrasonic waves, and includes: when the finger is not touched, the fingerprint touch control identification module sends out an ultrasonic signal, receives the reflected ultrasonic signal and generates a first electric signal; when a finger touches, the fingerprint touch control identification module sends out an ultrasonic signal, receives the reflected ultrasonic signal and generates a second electric signal; based on comparing the difference of the first electrical signal and the second electrical signal, a finger touch position may be determined.
Preferably, the finger touch position is detected, which includes the steps of: when the finger is detected to be controlled on the fingerprint touch control identification module, controlling each fingerprint touch control identification area to be started; based on the finger shape and the force difference of the touch fingerprint identification module, the finger force is normally distributed from the center to the periphery; and judging the center position of the finger pressing based on the peak ridge of the normal distribution, and generating a finger touch position signal.
In order to solve the technical problems, the invention also provides the following technical scheme: an electronic device comprises the fingerprint touch identification module.
Compared with the prior art, the fingerprint touch identification module, the fingerprint touch identification method and the electronic equipment have the following beneficial effects:
the invention provides a fingerprint touch identification module which comprises a plurality of fingerprint touch identification areas based on an ultrasonic detection principle and a control unit, wherein the control unit is electrically connected with and independently controls the fingerprint touch identification areas; by arranging the fingerprint touch control identification areas which can be independently controlled by the control unit, all the fingerprint touch control identification areas can be controlled to be started and the detection of the finger touch position can be realized when the touch occurs; and then, after the touch position is detected, driving one or more fingerprint touch control identification areas corresponding to the touch position to perform fingerprint identification. The fingerprint touch control identification module that above-mentioned provided can be applicable to large tracts of land ultrasonic sensor fingerprint identification especially. Because ultrasonic wave transmitting circuit adopts resonant circuit, when adopting above-mentioned fingerprint touch-control identification module to carry out subregion transmission and drive to large tracts of land fingerprint identification region, make the capacitance value that inserts in the circuit at every turn all in resonance range, can guarantee like this voltage stability in the fingerprint touch-control identification module with have high emission efficiency to on need not additionally to dispose the basis of other detection modules, also can realize large tracts of land fingerprint identification.
Furthermore, the fingerprint touch identification area comprises two electrode layers and a piezoelectric layer, the two electrode layers are respectively arranged on two opposite surfaces of the piezoelectric layer, and a plurality of electrode blocks are arranged on at least one of the electrode layers; fingerprint touch-control discernment module includes a plurality of switches, because in a fingerprint touch-control discernment district one the electrode piece all draws forth extremely through independent switch the control unit, consequently, the electrode piece on an at least electrode layer can play the effect that detects finger touch position, and it can realize finger touch position detection and finger fingerprint detection based on the structure of two electrode layers and piezoelectric layer.
In particular, to achieve a better control of the electrode block, the switch comprises a TFT switching tube. In order to realize effective control of different fingerprint touch control identification areas, switches connected with electrode blocks on the same electrode layer can be connected to the control unit in parallel.
In the fingerprint touch identification module provided by the invention, the electrode layer close to the surface to be touched can be defined as a whole conductive layer, and the electrode layer far away from the surface to be touched is the electrode blocks distributed in an array.
The invention also provides a fingerprint touch identification method which is carried out based on the fingerprint touch identification module, and the fingerprint touch identification method can control a plurality of fingerprint touch identification areas to be started simultaneously when touch positions are detected, and control the fingerprint touch identification area corresponding to the touch position to carry out fingerprint identification after the touch position is determined. A plurality of fingerprint touch-control identification districts that set up based on the subregion can realize subregion transmission fingerprint identification signal to guarantee that the capacitance value in the access circuit at every turn is in resonance range, thereby effectively guarantee among the fingerprint identification voltage stability and improve its transmitting efficiency. The requirement of large-area ultrasonic sensor fingerprint identification can be met, other detection modules do not need to be additionally configured, and the light weight, the thinness and the miniaturization of the electronic equipment can be guaranteed.
In some embodiments, the fingerprint touch identification method provided by the invention detects the finger touch position by using the capacitor, can scan static parameters of all fingerprint touch identification areas, further compares the stored original static parameters based on a capacitive imaging principle, outputs a comparison result and determines the finger touch position based on the comparison result. Finger touch position is detected based on electric capacity, can realize need not additionally to set up under the prerequisite that electric capacity touch detected the module, through fingerprint touch control identification module realizes finger position detection to and realize the subregion emission control based on the finger touch position that detects, with the user demand who satisfies large tracts of land fingerprint identification.
In some embodiments, the fingerprint touch recognition method detects the touch position of the finger by using ultrasonic waves, and can generate different electric signals based on the difference of ultrasonic electric signals emitted and reflected under different states of no touch of the finger and touch of the finger, and further compare the different electric signals so as to judge the touch position of the finger. According to the method for detecting the finger touch position based on the ultrasonic waves, the finger position detection can be realized through the fingerprint touch control identification module on the premise that other touch position detection modules are not additionally arranged, and the subarea emission control is realized based on the detected finger touch position, so that the use requirement of large-area fingerprint identification is met.
In some embodiments, when a finger is detected to be controlled on the fingerprint touch identification module, each fingerprint touch identification area is controlled to be started, the finger force is normally distributed from the center to the periphery based on the finger shape and the force difference of contacting the fingerprint touch identification module, the center position of finger pressing is judged based on the peak ridge of the normal distribution, and a finger touch position signal is generated. Based on foretell finger touch position's detection, can realize need not additionally to set up under the prerequisite that other touch position detected the module, through fingerprint touch-control identification module realizes pointing the position detection to and realize the subregion emission control based on finger touch position that detects, in order to satisfy large tracts of land fingerprint identification's user demand.
The invention also provides electronic equipment which comprises the fingerprint touch identification module. It has the same beneficial effect with above-mentioned fingerprint touch-control identification module. The electronic equipment can also meet the requirement of large-area ultrasonic sensor fingerprint identification, and other detection modules do not need to be additionally configured, so that the lightness, thinness and miniaturization of the electronic equipment can be guaranteed.
[ description of the drawings ]
Fig. 1 is a schematic diagram of a circuit structure based on ultrasonic fingerprint preparation in the prior art.
Fig. 2 is a schematic block diagram of a fingerprint touch recognition module according to a first embodiment of the present invention.
Fig. 3 is a schematic diagram of a connection relationship module between the single fingerprint touch identification area and the circuit structure and the control unit shown in fig. 1.
Fig. 4 is a schematic diagram of a connection relationship module between a single fingerprint touch identification area and a switch.
Fig. 5 is a second schematic diagram of a connection relationship module between a single fingerprint touch identification area and a switch.
Fig. 6 is a schematic diagram of a fingerprint touch recognition module including a plurality of fingerprint touch recognition areas.
Fig. 7 is a schematic diagram illustrating a principle of the fingerprint touch recognition module shown in fig. 2 recognizing a touch position of a finger by ultrasonic detection.
Fig. 8 is a schematic diagram of the fingerprint touch recognition module shown in fig. 2 recognizing a touch position of a finger by detecting a static parameter variation wave.
Fig. 9 is a schematic diagram of the fingerprint touch recognition module.
Fig. 10 is a flowchart illustrating steps of a fingerprint touch recognition method according to a second embodiment of the present invention.
Fig. 11 is a schematic flow chart illustrating the process of recognizing the touch position of the finger based on the fingerprint touch recognition module shown in step S1 of fig. 10.
Fig. 12 is a schematic flow chart of fingerprint identification data acquisition shown in step S2 in fig. 10.
Fig. 13 is a second schematic flow chart illustrating the process of recognizing the finger touch position based on the fingerprint touch recognition module shown in step S1 of fig. 10.
Fig. 14 is a third schematic flow chart illustrating the process of recognizing the finger touch position based on the fingerprint touch recognition module in step S1 of fig. 10.
The attached drawings indicate the following:
10. a fingerprint touch identification module; 100. a fingerprint touch identification area; 11. a circuit structure; 111. a circuit board; 12. a control unit; 109. an electrode layer; 1091. an electrode block; 101. a first electrode layer; 1011. a first electrode block; 103. a piezoelectric layer; 105. a second electrode layer; 1051. a second electrode block; 90. a finger or a touch object.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Reference in the specification to "one embodiment," "a preferred embodiment," "an embodiment," or "embodiments" means that a particular feature, structure, characteristic, or function described in connection with the embodiment is included in at least one embodiment of the invention and may be in more than one embodiment. The appearances of the phrases "in one embodiment," "in an embodiment," or "in various embodiments" in various places in the specification are not necessarily all referring to the same embodiment or embodiments.
Specific terminology is used throughout the description for illustration and is not to be construed as limiting. A service, function, or resource is not limited to a single service, function, or resource; use of these terms may refer to grouped related services, functions, or resources, which may be distributed or aggregated.
Referring to fig. 2, a fingerprint touch recognition module 10 suitable for large-area ultrasonic fingerprint touch recognition is provided in a first embodiment of the present invention. Fingerprint touch-control identification module 10 includes a plurality of fingerprint touch-control identification district 100 based on the ultrasonic detection principle, every fingerprint touch-control identification district 100 all independently is connected to a circuit structure 11 to realize the independent control in every fingerprint touch-control identification district 100. It can be understood that the fingerprint touch recognition areas 100 in the fingerprint touch recognition module 10 may be distributed in an array, and the number of the fingerprint touch recognition areas may be correspondingly adjusted based on the size of the area to be detected of the required fingerprint touch recognition.
It is understood that the circuit structure 11 may include a circuit board 111, and the circuit board 111 may be a printed circuit board, a flexible circuit board, or other circuit board having a conductive structure. The circuit structure 11 can also be used to electrically connect the fingerprint touch recognition area 100 to an external circuit structure.
As shown in fig. 2, the fingerprint touch recognition module 10 further includes a control unit 12, the control unit 12 is electrically connected to the fingerprint touch recognition area, and the control unit 12 independently controls the fingerprint touch recognition area 100; the control unit 12 controls all the fingerprint touch identification areas 100 to be started and detects finger touch positions; after detecting the finger touch position, the control unit 12 drives the fingerprint touch identification area 100 corresponding to the touch position to perform fingerprint identification. The control unit 12 may be at least one signal processing chip, and the signal processing chip may perform one or more functions of fingerprint recognition and touch recognition; alternatively, a plurality of processing chips may be disposed on the circuit board 111 at intervals, and each processing chip performs one or both of fingerprint recognition and touch recognition.
As shown in fig. 3, each fingerprint touch recognition area 100 includes two electrode layers 109 and a piezoelectric layer 103, the two electrode layers 109 are respectively disposed on two opposite surfaces of the piezoelectric layer 103, and at least one of the electrode layers 109 is provided with a plurality of electrode blocks 1091; the fingerprint touch recognition module 10 includes a plurality of switches 19 respectively corresponding to the plurality of electrode blocks 1091, that is, each electrode block 1091 is led out to the control unit 12 through a corresponding switch 19. The circuit board 111 is electrically connected to the two electrode layers 109, respectively. Specifically, the circuit board 111 is electrically connected to the electrode layer 109 through an electrical connection structure such as a wire. The circuit board 111 is preferably a flexible circuit board, so that the thickness of the entire fingerprint touch recognition module 10 can be reduced.
As shown in fig. 3, the switch 19 connected at the electrode block 1091 of the same electrode layer 109 may be connected in parallel to the control unit 12.
Specifically, as shown in fig. 3 and 4, two of the electrode layers 109 can be divided into a first electrode layer 101 and a second electrode layer 105, and the first electrode layer 101 and the second electrode layer 105 are respectively disposed on two opposite surfaces of the piezoelectric layer 103, wherein the first electrode layer 101 is close to one side touched by a finger.
As shown in fig. 4 in particular, the second electrode layer 105 includes a plurality of second electrode blocks 1051 distributed in an array, where the second electrode blocks 1051 are on a surface of the piezoelectric layer 103 away from the finger. The plurality of second electrode blocks 1051 are used for inducing an ultrasonic signal. The area size of the second electrode blocks 1051 and the gap between the second electrode blocks 1051 have an influence on the accuracy of fingerprint touch recognition, and generally, the smaller the area of the second electrode blocks 1051 is, the higher the recognition accuracy of the fingerprint touch recognition area 100 is, and the smaller the gap between the second electrode blocks 1051 is, the higher the recognition accuracy of the fingerprint touch recognition area 100 is. In order to obtain a better detection effect, the area of the second electrode block 1051 is 25um × 25um, 70um × 70um, further 30um × 30um, 50um × 50um, 60um × 60um; the gap between two adjacent second electrode blocks 1051 is 4um-12um, and further the gap is 5um-10um; since the width of one valley-ridge period of the finger is generally 300um, it is advantageous to ensure the definition of the recognized fingerprint by controlling the size of the second electrode block 1051, thereby ensuring the accuracy of fingerprint recognition. The second electrode block 1051 includes a transparent conductive material, such as indium tin oxide, indium gallium zinc oxide, or other transparent conductive metal oxides.
In some embodiments of the present invention, the first electrode layer 101 is a whole conductive layer. It is understood that the first electrode layer 101 may also be electrically connected to the circuit structure 11 by disposing a plurality of second electrode blocks 1051 arranged in an array. The size and the position of the second electrode block 1051 of the first electrode layer 101 are consistent with the size and the position of the second electrode block 1051 of the second electrode layer 105, and the sizes and the positions correspond to each other one by one.
As shown in fig. 5, when the first electrode layer 101 includes a plurality of second electrode blocks 1051 arranged in an array, the second electrode layer 105 may be a full-layer electrode. At least one of the first electrode layer 101 and the second electrode layer 105 is a plurality of first electrode blocks 1011 or second electrode blocks 1012 arranged in an array, so as to realize large-area fingerprint identification and/or touch identification. The first electrode layer 101 is made of a transparent conductive material, such as indium tin oxide, indium gallium zinc oxide, or other transparent conductive metal oxides. The first electrode layer 101 may also be made of Ag.
In this embodiment, the piezoelectric layer 103 may be a piezoelectric film, and specifically, the piezoelectric layer 103 is a ferroelectric polymer film, and in a specific embodiment, the ferroelectric polymer film is obtained by purchasing an existing finished ferroelectric polymer film and then polarizing the ferroelectric polymer film by adhering the film to a substrate. Generally, the ferroelectric polymer film of the finished product needs to be pulled up to have certain stress and then is adhered on a substrate for polarization, the thickness of the ferroelectric polymer film formed by the method is more than 30 μm, which is not suitable for the development trend of lightness and thinness of the existing electronic devices, and the fingerprint touch identification module adopting the polarization film has lower resolution because the piezoelectric sensing film is too thick. The polarization method of the ferroelectric polymer thin film in the above embodiment is mostly performed by directly setting a high voltage electric field between the upper and lower surfaces of the ferroelectric polymer thin film, but the ferroelectric polymer thin film itself has uneven thickness, so that the ferroelectric polymer thin film may be easily broken down by a high voltage electric field, the yield of the piezoelectric film is very low, which is not favorable for mass production, and the obtained piezoelectric film has poor piezoelectric effect and short service life.
In another specific embodiment, the piezoelectric layer 103 of the present invention may be a ferroelectric polymer thin film formed by in-situ polarization, and specifically, the piezoelectric layer 103 is a piezoelectric film (not shown) formed in-situ on a surface of the second electrode layer 105, the piezoelectric film includes a first surface and a second surface opposite to each other, the first surface is a surface close to the second electrode layer 105, and the second surface is a surface close to the first electrode layer 101. Making the first surface potential of the piezoelectric film zero during polarization; providing a first electric field and a second electric field at the side of the second surface of the piezoelectric film, wherein the potential of the first electric field is higher than that of the second electric field; and ionizing the ambient gas on the side where the second surface of the piezoelectric film is located under the action of the first electric field, wherein the ambient gas passes through the second electric field and is gathered on the second surface of the piezoelectric film, so that an intra-film electric field along the thickness direction of the film is formed in the piezoelectric film, and the piezoelectric film is polarized to form the piezoelectric layer 103. It can be understood that the ferroelectric polymer thin film is formed on the surface of the second electrode layer 105 by wet chemical methods such as chemical vapor deposition, coating, dip coating, etc., so that a ferroelectric polymer thin film with a very thin and uniform thickness can be formed, the thickness can be less than 30um, preferably, the thickness can be maintained below 9um, thereby reducing the transmission loss of signals, the formation process is simple, and the corresponding resolution of the fingerprint touch recognition area 100 using the in-situ formed polarization film is greatly improved. The thickness of piezoelectric layer 103 can further be less than 9um, and still further, its thickness can be 1.5um-7.4um, 1.9um-7.2um, 2.2um-8.6um, 2.8um-8.4um or 3.6um-6.6um, and further, can be specifically 1.8um, 2.4um, 2.6um, 3.7um, 3.9um, 4.2um, 4.6um, 5.6um, 5.8um, 6.7um, 8.6um, 8.7um.
Furthermore, compared to the polarization method in which electrodes are directly disposed on the upper and lower surfaces of the piezoelectric layer 103, the above-mentioned virtual polarization method does not make the piezoelectric layer 103 directly bear the applied high voltage electric field, and can prevent the piezoelectric layer 103 from being broken down. Specifically, the polarization may be plasma polarization (see, for example, chinese patent application No. 201710108374.9) or X-ray polarization (see, for example, chinese patent application No. 201622575.3) to form the piezoelectric layer, and the formed piezoelectric layer 113 may be very thin, and the piezoelectric effect and the long service life of the piezoelectric layer 103 of the present invention may be well applied to the fingerprint touch recognition module 11, so as to achieve a good recognition effect of the fingerprint touch recognition module 11. In this embodiment, the piezoelectric constant d33 of the piezoelectric layer 113 subjected to in-situ polarization is in the range of 20pC/N to 35pC/N, and more preferably in the range of 25pC/N to 29pC/N.
It is understood that the material of the piezoelectric layer 103 is a ferroelectric polymer material, and specifically, the materials can be selected from, but not limited to: polyvinylidene fluoride, polyvinyl chloride, poly-gamma-methyl-L-glutamate, polycarbonate, polyvinylidene fluoride PVDF, polyvinylidene fluoride trifluoroethylene PVDF-TrFE, polymethyl methacrylate PMMA, polytetrafluoroethylene TEFLON and other copolymers or a combination of a plurality of copolymers.
In some embodiments of the present invention, the polyvinylidene fluoride copolymer is polyvinylidene fluoride-trifluoroethylene copolymer, specifically polyvinylidene fluoride trifluoroethylene PVDF-TrFE, is selected as the material of the piezoelectric layer 103, and in order to obtain a piezoelectric layer with a better piezoelectric effect, the mass ratio of the polyvinylidene fluoride to the trifluoroethylene is (60-95): (5-30), preferably, the mass ratio thereof is in the range of (75-86): (15-25), further preferably, the mass ratio is 80:20 or 75:25 or 70:30, the polyvinylidene fluoride and trifluoroethylene copolymer can reduce cost compared with the polyvinylidene fluoride selected independently, and has better piezoelectric effect.
The piezoelectric film obtained after the ferroelectric polymer film is polarized has alpha-phase crystal grains, beta-phase crystal grains and amorphous substances, the content of the beta-phase corresponds to the piezoelectric effect of the piezoelectric film 113, when the content of the beta-phase crystal grains accounts for 60-70% of the total crystal grains, the polarized film has a better piezoelectric effect, and the piezoelectric effect of the polarized film is better when the content of the beta-phase is higher. However, excessive polarization can produce unwanted excess charges, etc., which can easily recombine with other charges on the polymer surface, thereby affecting the performance of the resulting piezoelectric film. In this embodiment, the β -phase crystal grains to the total crystal grains mass ratio of the ferroelectric polymer piezoelectric film is 60% to 70%.
As further shown in fig. 5, each second electrode pad 1051 in the second electrode layer 105 is connected to the circuit structure 11 by a separate switch 19. In particular, for better control, the switch 19 may preferably be a TFT switching tube 191. That is, each individual ITO electrode is connected to one TFT switch tube 191.
With reference to fig. 4 and fig. 6, in some embodiments, the fingerprint touch recognition module 10 includes four fingerprint touch recognition areas 100, where each fingerprint touch recognition area 100 implements a detection method: when a finger is placed on the fingerprint touch identification module 10, all the TFT switching tubes 191 connected to the second electrode block 1051 may be turned on, static parameter scanning may be performed on all the fingerprint touch identification areas 100, and pre-stored original static parameters may be compared based on a capacitive imaging principle, so that a touch position and a center point of the finger may be determined, and the TFT switching tubes 191 may be disconnected after the position is determined. Further, based on the determined finger touch position and the center point, the TFT switching tube 191 connected to the second electrode block 1051 in the fingerprint touch recognition area 100 corresponding to the finger touch position may be driven to be turned on, and perform fingerprint recognition scanning.
It is understood that the TFT switching tube 191 connected to the second electrode block 1051 in the fingerprint touch recognition area 100 that does not correspond to the finger touch position may be in an open state or a conductive state.
Further, it can be understood that the confirmation of the finger touch position can also be performed in a manner as shown in fig. 7. That is, the confirmation of the touch position can also be obtained by the fingerprint touch identification area 100 by means of ultrasonic signal transmission. The circuit structure 11 may be connected to the fingerprint touch recognition area 100, when no finger touch occurs in the fingerprint touch recognition area 100 in the display module 19, the ultrasonic signal emitted by the piezoelectric layer 103 is reflected by the surface of the display module 19, the piezoelectric layer 103 may detect the reflected ultrasonic signal and generate an electrical signal, and the second electrode block 1051 of the second electrode layer 105 may generate a certain amount of induced charges due to the electrostatic coupling; when the surface of the fingerprint touch recognition module 10 is touched, because the touch object 90 (for example, a finger of a user) and the surface of the fingerprint touch recognition area 100 in the display module 19 are in contact with each other, so that a part of the ultrasonic signal can penetrate through the display module 19 and enter the touch object 90, the ultrasonic signal reflected back from the touched position received by the piezoelectric layer 103 changes, and thus the electric signal generated by the piezoelectric layer 103 at the touched position changes, so that the number of induced charges generated by the second electrode block 1051 at the corresponding position also changes, while the ultrasonic signal reflected back from the position not touched does not change, so that the number of induced charges generated by the second electrode block 1051 at the position not touched does not change, and therefore, whether the number of induced charges at the touched position and the position not touched changes can be detected through the fingerprint touch recognition area 100 connected with the piezoelectric layer to determine the touched position, that is the touched position by the ultrasonic finger, that is the detection of the touched position by the ultrasonic finger is realized. After the finger touch position is determined, the TFT switch tube 191 is disconnected, and further, based on the determined finger touch position and the central point, the TFT switch tube 191 connected with the second electrode block 1051 corresponding to the finger touch position and the central point can be driven to be opened, and fingerprint identification scanning is performed.
Further, the confirmation of the finger touch position may also be performed in a manner as shown in fig. 8. Specifically, can obtain the position that the finger touched based on the difference of finger form and the dynamics difference of touching fingerprint touch-control identification module, its principle as follows: in the corresponding fingerprint touch identification areas 100, if a finger 90 (a touch object) is pressed on a certain fingerprint touch identification area 100 by a certain pressure, because the form of the finger and the force of a contact sensor are different, the force at the center of the finger is slightly greater than the force around the finger, and the normal distribution can be specifically referred to; in this way, the finger 90 presses the sensor, so that the static parameter of the fingerprint touch identification area 100 is changed, the change of the static parameter is reflected that the central position of the finger 90 and the difference of the signal quantity sensed by the fingerprint touch identification module 10 exist in the ridges of the finger 90, and the difference processes the finger signal into a signal of the touch position of the finger 90 through the IC processing circuits such as the circuit structure 11 and the amplifying circuit, and then the signal is transmitted out to determine the position of the finger touch.
It can be understood that, as shown in fig. 9, when the touch position of the finger 901 is located in the single fingerprint touch identification area 100, after the touch position of the finger 901 is determined, the fingerprint touch identification area 100 may be driven to perform fingerprint identification; when the touch position of the finger 902 is located in two or more fingerprint touch identification areas 100, for example, just across different fingerprint touch identification areas 100, a plurality of fingerprint touch identification areas 100 can be driven simultaneously for fingerprint identification.
Referring to fig. 10, a second embodiment of the present invention provides a fingerprint touch recognition method S10, which is performed based on the fingerprint touch recognition module provided in the first embodiment, and includes the following steps:
s1, controlling a plurality of fingerprint touch identification areas to be started simultaneously when touch positions are detected; and
s2, after the touch position is determined, controlling a fingerprint touch control identification area corresponding to the touch position to carry out fingerprint identification;
specifically, adopt the fingerprint touch-control identification module that above-mentioned embodiment provided, it includes first electrode layer, piezoelectric layer and the second electrode layer that the stack set up, wherein, first electrode layer and/or the second electrode layer includes a plurality of electrode blocks, and every electrode block is connected to through independent switch circuit structure to the realization is respectively to the independent control of a plurality of electrode blocks.
In particular, for better control, the switch may preferably be a TFT switching tube. That is, each individual ITO electrode (second electrode block) is connected to one TFT switching tube. In this embodiment, it is not necessary to additionally configure other position detection or capacitance detection modules, and based on the fingerprint touch recognition module including a plurality of independently arranged fingerprint touch recognition areas, the finger touch position detection and the finger fingerprint detection can be realized.
The method for detecting the finger touch position by adopting the fingerprint touch control identification area can comprise the steps of detecting the finger touch position based on capacitance, detecting the finger touch position based on ultrasonic waves, and obtaining finger touch position detection based on different finger shapes and different finger contact force of the finger in contact with the fingerprint touch control identification module.
Specifically, as the finger touch position is detected based on the capacitance, as shown in fig. 11, the step S1 may further include the steps of:
step S11a, acquiring original static parameters corresponding to the fingerprint touch control identification module in a non-working state;
and S12a, controlling each fingerprint touch identification area to start when the finger touch is detected on the fingerprint touch identification module. Specifically, it can be understood that the switches of all corresponding connection electrode blocks in the fingerprint touch identification area can be turned on; specifically, with the structure of the fingerprint touch recognition module 10 shown in fig. 4, all TFT switching tubes connected to the second electrode block can be turned on, and static parameter scanning is performed on all fingerprint touch recognition areas, comparing the stored original static parameters based on the capacitive imaging principle.
Step S13a, static parameter scanning is carried out on all fingerprint touch control identification areas;
s14a, comparing the stored original static parameters based on a capacitance imaging principle, and outputting a comparison result; and
and step S15a, determining the finger touch position based on the comparison result.
Further, after the step S15a is completed, the method may further include the following steps:
and step S16a, after the finger touch position is detected, disconnecting the TFT switch tube.
Further, based on the determined finger touch position and the center point, the TFT switching tube 191 connected to the second electrode block 1051 in the corresponding fingerprint touch recognition area 100 may be driven to be turned on, and perform fingerprint recognition scanning.
Specifically, referring to fig. 4 and 12, based on the determined finger touch position and the center point, the step S2 may include:
step S21, driving a TFT switch tube connected with a second electrode block in the corresponding fingerprint touch identification area to be opened;
step S22, driving the corresponding fingerprint touch control identification area and providing a transmitting signal Tx; and
step S23, driving the corresponding receiver Rx of the corresponding fingerprint touch identification area to perform fingerprint identification scanning.
In some other embodiments, specifically, as the detection of the finger touch position is realized based on ultrasonic detection, the TFT switch tube always handles the on state in the process of detecting the finger touch position by using ultrasonic waves. As shown in fig. 13, the above step S1 may further include the steps of:
and S11b, when the finger is not touched, the fingerprint touch control identification module sends out an ultrasonic signal, receives the reflected ultrasonic signal and generates a first electric signal. Specifically, it can be understood that an ultrasonic signal is emitted by the piezoelectric layer, and the electrode block of the lower electrode layer generates a first variation of induced charge based on the effect of electrostatic coupling;
and S12b, when the finger touches, the fingerprint touch control identification module sends out an ultrasonic signal and generates a second electric signal after receiving the reflected ultrasonic signal. Specifically, it can be understood that the piezoelectric layer sends out an ultrasonic signal, receives the reflected ultrasonic signal and generates a second electrical signal, and at this time, the electrical signal generated by the piezoelectric layer at the finger touch position is also changed, so as to change the second variation of the induced charge generated by the electrode block at the corresponding position; and
and S13b, judging the finger touch position based on the comparison of the difference between the first electric signal and the second electric signal, namely realizing ultrasonic touch detection. Specifically, the touch position can be determined based on comparing the first variation of the induced charge and the second variation of the induced charge in the two states, that is, the ultrasonic touch detection is realized.
Specifically, in the above step, the fingerprint touch recognition module may be disposed below the display module, the ultrasonic signal emitted by the piezoelectric layer is reflected by the display module disposed above the plurality of fingerprint touch recognition areas, and the piezoelectric layer may detect the ultrasonic signal reflected by the display module and generate the first electrical signal; when the finger touches, the finger can enable part of ultrasonic signals to enter the finger through the display module, the ultrasonic signals received by the piezoelectric layer change, the second electric signals generated at the finger touch position corresponding to the piezoelectric layer are generated, and the quantity of induced charges generated by the conductive block at the corresponding position also changes; the touch position can be judged by comparing whether the quantity of the induced charges at the touched position and the untouched position changes, namely, the ultrasonic touch detection is realized.
Further, after the step S13b is completed, the method may further include the following steps:
and S14b, disconnecting the TFT switch tube after the finger touch position is detected.
Further, after the determined finger touch position and the central point are based, a TFT switch tube connected with the second electrode block in the corresponding fingerprint touch identification area can be driven to be turned on, and fingerprint identification scanning is carried out.
In another embodiment, if the position touched by the finger is obtained based on the finger shape difference and the force difference of the finger contacting the fingerprint touch recognition module, as shown in fig. 8 and 14, the step S1 may further include:
and S11c, when the finger is detected to be controlled on the fingerprint touch control identification module, controlling each fingerprint touch control identification area to be started. Specifically, it can be understood that all the TFT switching tubes connected to the second electrode block corresponding to each fingerprint touch identification area are turned on;
step S12c, based on the finger shape and the force difference of the touch fingerprint identification module, the finger force is normally distributed from the center to the periphery; and
and S13c, judging the position of the center pressed by the finger based on the peak ridge of the normal distribution, and generating a finger touch position signal.
Specifically, in step S12c, the specific operation principle is as follows: if a finger (touch object) is pressed on a certain fingerprint touch identification area 100 by a certain pressure, the force at the center of the finger is slightly greater than the force around the finger due to the difference between the form of the finger and the force of the touch sensor, and the normal distribution can be referred to specifically; the mode that the sensor is pressed by the finger causes the change of the static parameters of the fingerprint touch control identification area, the change of the static parameters is reflected that the central position of the finger and the difference exist in the signal quantity sensed by the fingerprint touch control identification module, and the difference transmits the finger signal after processing the finger signal into a finger touch position signal through the circuit structure, the amplifying circuit and other IC processing circuits.
In step S13c, after the corresponding finger touch position signal is obtained, the fingerprint touch identification area corresponding to the finger touch position may be further driven to perform fingerprint identification.
Therefore, based on the structure of each fingerprint touch identification area in the fingerprint touch identification module, the fingerprint touch identification area in the finger touch area is selected for fingerprint image identification after the finger touch position is acquired. Therefore, accurate fingerprint identification of a large-area identification area can be achieved based on the fingerprint touch identification method, compared with the prior art, an identification chip or a sensor of a touch position does not need to be additionally arranged, the accurate fingerprint identification can be achieved based on the structure of the fingerprint touch identification area, the detectable range of the fingerprint touch identification module can be larger, and the size of the fingerprint touch identification module can be kept small.
A third embodiment of the present invention provides an electronic device comprising a fingerprint touch recognition module as described above, which may be a cell phone, a notebook computer, a tablet computer, a printer, a copier, a scanner, a facsimile device, a Global Positioning System (GPS) receiver/navigator, a camera, a digital media player, a Personal Data Assistant (PDA), a camcorder, a game console, a wrist watch, a clock, a calculator, a television monitor, a flat panel display, an electronic reading device (e.g., an electronic reader), a mobile health device, a computer monitor, an automotive display (including odometer and speedometer displays, etc.), a cockpit control and/or display, a camera view display (e.g., of a rear view camera in a vehicle), an electronic photograph, an electronic bulletin board or sign, a projector, a building structure, a refrigerator, a stereo system, a cassette recorder or player, a DVD player, a CD player, a VCR, a radio device, a portable memory chip, a washing machine, a dryer, a washing/drying machine, a parking meter, etc.
Particularly, the electronic equipment can be the electronic equipment that has the display screen, electronic equipment includes the display module assembly, fingerprint touch-control identification module assembly is located one side that the user was kept away from to the display module assembly. The display module can be an LCD screen, an OLED screen and the like.
Compared with the prior art, the fingerprint touch identification module, the fingerprint touch identification method and the electronic equipment have the following beneficial effects:
the invention provides a fingerprint touch identification module which comprises a plurality of fingerprint touch identification areas based on an ultrasonic detection principle and a control unit, wherein the control unit is electrically connected with and independently controls the fingerprint touch identification areas; by arranging the fingerprint touch control identification areas which can be independently controlled by the control unit, all the fingerprint touch control identification areas can be controlled to be started and the detection of the finger touch position can be realized when the touch occurs; and then, after the touch position is detected, driving the fingerprint touch control identification area corresponding to the touch position to perform fingerprint identification. The fingerprint touch control identification module that above-mentioned provided can be applicable to large tracts of land ultrasonic sensor fingerprint identification especially. Because ultrasonic emission circuit adopts resonant circuit, when adopting above-mentioned fingerprint touch-control identification module to carry out subregion transmission and drive to the fingerprint identification region of large tracts of land, make the capacitance value of access circuit in every turn all in resonance range, can guarantee like this voltage stability in the fingerprint touch-control identification module with have high emission efficiency to on the basis that need not additionally to dispose other detection modules, also can realize large tracts of land fingerprint identification.
Furthermore, the fingerprint touch identification area comprises two electrode layers and a piezoelectric layer, the two electrode layers are respectively arranged on two opposite surfaces of the piezoelectric layer, and a plurality of electrode blocks are arranged on at least one of the electrode layers; fingerprint touch-control discernment module includes a plurality of switches, because in a fingerprint touch-control discernment district one the electrode piece all draws forth extremely through independent switch the control unit, consequently, the electrode piece on an at least electrode layer can play the effect that detects finger touch position, and it can realize finger touch position detection and finger fingerprint detection based on the structure of two electrode layers and piezoelectric layer.
In particular, to achieve a better control of the electrode block, the switch comprises a TFT switching tube. In order to realize effective control of different fingerprint touch control identification areas, switches connected with electrode blocks on the same electrode layer can be connected to the control unit in parallel.
In the fingerprint touch identification module provided by the invention, the electrode layer close to the surface to be touched can be defined as a whole conductive layer, and the electrode layer far away from the surface to be touched is the electrode blocks distributed in an array.
The invention also provides a fingerprint touch identification method which is carried out based on the fingerprint touch identification module, and the fingerprint touch identification method can control a plurality of fingerprint touch identification areas to be simultaneously started when touch positions are detected, and control the fingerprint touch identification area corresponding to the touch position to carry out fingerprint identification after the touch position is definite. A plurality of fingerprint touch-control identification districts that set up based on the subregion can realize subregion transmission fingerprint identification signal to guarantee that the capacitance value in the access circuit at every turn is in resonance range, thereby effectively guarantee among the fingerprint identification voltage stability and improve its transmitting efficiency.
In some embodiments, the fingerprint touch identification method provided by the invention detects the finger touch position by using the capacitor, can scan static parameters of all fingerprint touch identification areas, further compares the stored original static parameters based on a capacitive imaging principle, outputs a comparison result and determines the finger touch position based on the comparison result. Finger touch position is detected based on electric capacity, can realize need not additionally to set up under the prerequisite that electric capacity touch detected the module, through fingerprint touch control identification module realizes finger position detection to and realize the subregion emission control based on the finger touch position that detects, with the user demand who satisfies large tracts of land fingerprint identification.
In some embodiments, the fingerprint touch recognition method provided by the invention detects the touch position of the finger by using ultrasonic waves, can generate different electric signals based on the difference of ultrasonic electric signals emitted and reflected under different states of no touch of the finger and touch of the finger, and can further compare the different electric signals so as to judge the touch position of the finger. According to the method for detecting the finger touch position based on the ultrasonic wave, the finger position detection can be realized through the fingerprint touch control identification module on the premise that other touch position detection modules are not additionally arranged, and the subarea emission control is realized based on the detected finger touch position, so that the use requirement of large-area fingerprint identification is met.
In some embodiments of the fingerprint touch identification method provided by the invention, when a finger is detected to be controlled on the fingerprint touch identification module, each fingerprint touch identification area is controlled to be started, the finger strength is normally distributed from the center to the periphery based on the finger form and the strength difference of contacting the fingerprint touch identification module, the center position of finger pressing is judged based on the peak ridge of the normal distribution, and a finger touch position signal is generated. Based on foretell finger touch position's detection, can realize need not additionally to set up under the prerequisite that other touch position detected the module, through fingerprint touch-control identification module realizes pointing the position detection to and realize the subregion emission control based on finger touch position that detects, in order to satisfy large tracts of land fingerprint identification's user demand.
The invention also provides electronic equipment which comprises the fingerprint touch identification module. It has the same beneficial effect with above-mentioned fingerprint touch-control identification module. The electronic equipment can also meet the requirement of large-area ultrasonic sensor fingerprint identification, and other detection modules do not need to be additionally configured, so that the lightness, thinness and miniaturization of the electronic equipment can be guaranteed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents and improvements made within the spirit of the present invention should be included in the scope of the present invention.
Claims (8)
1. The utility model provides a fingerprint touch-control discernment module which characterized in that: the fingerprint touch control device comprises a plurality of fingerprint touch control identification areas based on an ultrasonic detection principle, a control unit and a plurality of switches, wherein the control unit is connected with the switches in parallel and is electrically connected with the switches at the same time, controls the fingerprint touch control identification areas to be started at the same time when the touch control position detection is carried out, and controls the fingerprint touch control identification areas corresponding to the touch position to carry out fingerprint identification after the touch position is determined;
the fingerprint touch control identification area comprises two electrode layers and a piezoelectric layer, the two electrode layers are arranged on two opposite surfaces of the piezoelectric layer respectively, at least one electrode layer is provided with a plurality of electrode blocks, one electrode block is led out to the control unit through one switch, and the switch connected with the electrode blocks of the same electrode layer is connected to the control unit in parallel.
2. The fingerprint touch recognition module of claim 1, wherein: the switch comprises a TF T switch tube.
3. The fingerprint touch recognition module of claim 1, wherein: the electrode layer close to the surface to be touched is a whole conductive layer, and the electrode layer far away from the surface to be touched is the electrode blocks distributed in an array mode.
4. A fingerprint touch control identification method is characterized in that: it is performed on the basis of the fingerprint touch recognition module as defined in any one of claims 1 to 3, comprising the steps of: the parallel switches control the multiple fingerprint touch control identification areas to be started simultaneously when the touch control positions are detected, and control the fingerprint touch control identification area corresponding to the touch position to perform fingerprint identification after the touch position is determined;
the fingerprint touch control identification area comprises two electrode layers and a piezoelectric layer, the two electrode layers are arranged on two opposite surfaces of the piezoelectric layer respectively, at least one electrode layer is provided with a plurality of electrode blocks, one electrode block is led out to the control unit through one switch, and the switch connected with the electrode blocks of the same electrode layer is connected to the control unit in parallel.
5. The fingerprint touch recognition method of claim 4, wherein: the detecting the finger touch position includes detecting the finger touch position by capacitance, and includes the following steps: acquiring original static parameters corresponding to the fingerprint touch identification module in a non-working state; when detecting that a finger touches the fingerprint touch identification module, controlling each fingerprint touch identification area to start; static parameter scanning is carried out on all fingerprint touch identification areas; comparing the stored original static parameters based on a capacitance imaging principle, and outputting a comparison result; and determining the finger touch position based on the comparison result.
6. The fingerprint touch recognition method of claim 4, wherein: the detecting the finger touch position includes detecting the finger touch position with ultrasonic waves, and includes the steps of: when the finger is not touched, the fingerprint touch control identification module sends out an ultrasonic signal, receives the reflected ultrasonic signal and generates a first electric signal; when a finger touches, the fingerprint touch control identification module sends out an ultrasonic signal, receives the reflected ultrasonic signal and generates a second electric signal; based on comparing the difference of the first electrical signal and the second electrical signal, a finger touch position may be determined.
7. The fingerprint touch recognition method of claim 4, wherein: detecting a finger touch position, comprising the steps of: when the finger is detected to be controlled on the fingerprint touch control identification module, controlling each fingerprint touch control identification area to be started; based on the finger shape and the force difference of the touch fingerprint identification module, the finger force is normally distributed from the center to the periphery; and judging the position of the center of the finger pressing based on the peak ridge of the normal distribution, and generating a finger touch position signal.
8. An electronic device, characterized in that: comprising the fingerprint touch recognition module according to any one of claims 1-3.
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| CN115188034B (en) * | 2022-07-14 | 2023-10-20 | 深圳市汇顶科技股份有限公司 | Ultrasonic fingerprint detection device and electronic equipment |
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