CN115328384A - Touch sensing method and device based on PVDF piezoelectric film - Google Patents
Touch sensing method and device based on PVDF piezoelectric film Download PDFInfo
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- CN115328384A CN115328384A CN202211027209.8A CN202211027209A CN115328384A CN 115328384 A CN115328384 A CN 115328384A CN 202211027209 A CN202211027209 A CN 202211027209A CN 115328384 A CN115328384 A CN 115328384A
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- 239000002033 PVDF binder Substances 0.000 title claims abstract description 125
- 229920002981 polyvinylidene fluoride Polymers 0.000 title claims abstract description 125
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000008447 perception Effects 0.000 claims abstract description 17
- 230000008859 change Effects 0.000 claims abstract description 11
- 239000010408 film Substances 0.000 claims description 108
- 230000000875 corresponding effect Effects 0.000 claims description 10
- 230000035807 sensation Effects 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 7
- 230000003068 static effect Effects 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 4
- 230000002596 correlated effect Effects 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 239000010409 thin film Substances 0.000 claims description 2
- 230000003993 interaction Effects 0.000 abstract description 7
- 241000282414 Homo sapiens Species 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 235000001968 nicotinic acid Nutrition 0.000 description 1
- 230000002688 persistence Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
- G06F3/0487—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
- G06F3/0488—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures
- G06F3/04883—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures for inputting data by handwriting, e.g. gesture or text
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- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
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- Electronic Switches (AREA)
Abstract
The invention discloses a touch perception method and a touch perception device based on a PVDF piezoelectric film, wherein the PVDF piezoelectric film is arranged in the touch perception device; when a finger touches the device, the PVDF piezoelectric film working in a resonance state is acted by the finger force, and the resonance frequency of the PVDF piezoelectric film changes; the change of the resonant frequency of the PVDF piezoelectric film is measured and analyzed, so that the touch state of the finger is sensed. By adopting the technical scheme, the moment when the finger just touches the device can be identified, and two states of the device which is not touched by the finger and the device which is touched by the finger can also be identified; and through arraying the PVDF piezoelectric films, the resonance frequency of each PVDF piezoelectric film is respectively measured and analyzed, so that the finger sliding can be sensed, and the device is novel, convenient and comfortable man-machine interaction equipment.
Description
Technical Field
The invention belongs to the technical field of piezoelectric material sensor application. More specifically, the invention relates to a method for tactile perception based on a PVDF piezoelectric film, and a device using the method.
Background
In recent years, the rapid development of information technology has widely and profoundly influenced the production and life of human beings; as an important component, the human-computer interaction technology gradually transitions from a stage of adapting to a computer to a stage of centering on human beings in an information technology updating trend, and the novel human-computer interaction technology can bring better experience to users.
PVDF is a high polymer material, and since Kawai discovered by Japan scholars in 1969 that PVDF has a strong piezoelectric effect, PVDF has been developed into an indispensable piezoelectric material and has wide application prospects in the fields of vibration detection, nondestructive detection and the like.
In recent years, due to the characteristics of good matching performance of the PVDF piezoelectric film and the like with a human body, the PVDF piezoelectric film is generally applied to the fields of robot bionics, biomedical engineering, physiological signal measurement and the like. But PVDF as a passive sensing unit has a drawback that PVDF outputs a signal only at a moment when the force load increases, and PVDF does not output a signal when the force load on PVDF exists and continues.
Disclosure of Invention
The invention provides a touch perception method based on a PVDF piezoelectric film, which aims to realize the perception of the existence and the continuity of finger load and the sliding of fingers.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention relates to a touch perception method based on a PVDF piezoelectric film, wherein the PVDF piezoelectric film is arranged in a touch perception device; when a finger touches the device, the PVDF piezoelectric film working in a resonance state is acted by the finger force, and the resonance frequency of the PVDF piezoelectric film is changed; the change of the resonant frequency of the PVDF piezoelectric film is measured and analyzed, so that the touch state of the finger is sensed.
Arraying the PVDF piezoelectric films; by respectively measuring and analyzing the resonance frequency of each PVDF piezoelectric film, the finger sliding can be sensed.
The method comprises the following steps:
step S1: a finger makes a static touch or slide on the device;
step S2: the device transmits the pressure to the PVDF piezoelectric film (5) under the pressure load of the finger, and the resonance frequency of the PVDF piezoelectric film (5) is changed under the pressure load;
and step S3: comparing the detected resonant frequency with a resonant frequency recorded in advance when the touch is not made; if the resonant frequency of one PVDF piezoelectric film changes obviously, the PVDF piezoelectric film is touched at the moment;
and step S4: returning the state of each PVDF piezoelectric film according to the step S3;
step S5: and judging whether the finger slides according to the steps S3 and S4.
In the step S4, if the resonance frequency of the PVDF piezoelectric film is changed and then returns to the initial state, it indicates that the position corresponding to the PVDF piezoelectric film is touched; if the resonance frequency of the PVDF piezoelectric film is changed and the changed resonance frequency is maintained, the corresponding position of the PVDF piezoelectric film is touched and the finger does not leave.
In the step S5, if the touched position change corresponding to the PVDF piezoelectric film is correlated with time, it indicates that the finger is sliding at different positions.
In order to achieve the same purpose as the technical scheme, the invention also provides a device of the touch perception method based on the PVDF piezoelectric film, which has the technical scheme that:
the device is structurally characterized by comprising three layers, wherein the upper layer is a distribution array of a plurality of unconnected anode electrodes, the middle layer is the PVDF piezoelectric film, and the lower layer is a common cathode electrode.
Each anode electrode is connected with the outer end of the anode electrode through an anode electrode lead; and the common cathode electrode is connected with the outer end of the common cathode of the PVDF piezoelectric film through a cathode electrode lead.
And two ends of the PVDF piezoelectric film are respectively provided with a rapid frequency measuring circuit.
The rapid frequency measurement circuit adopts a Hilbert transform detection method or a Kalman filtering method to rapidly measure the change of the instantaneous frequency of the PVDF piezoelectric film.
The PVDF piezoelectric film is integrated on the inner side of the outer frame of an electronic product, and a key does not need to be arranged, so that the consistency of the overall appearance is better, and the hand feeling is more comfortable.
By adopting the technical scheme, the device can identify the moment when the finger just touches the device, and can also identify two states of the device when the finger does not touch the device and the device when the finger touches the device; and the PVDF piezoelectric film is arrayed, and the resonance frequency of each PVDF piezoelectric film is respectively measured and analyzed, so that the finger sliding can be sensed, and the device is novel, convenient and comfortable man-machine interaction equipment.
Drawings
The contents of the drawings and the reference numbers in the drawings are briefly described as follows:
FIG. 1 is a schematic view of the overall process flow of the present invention.
FIG. 2 is a schematic representation of a PVDF piezoelectric film array of the structure of the present invention.
Fig. 3 is an enlarged schematic view of a part of the PVDF piezoelectric thin film array structure in fig. 2.
Fig. 4 is a schematic diagram of an embodiment of the present invention.
Labeled as:
1. the anode electrode 2, an anode electrode lead 3, an anode electrode outer end, 4, a PVDF piezoelectric film common cathode outer end, 5, a PVDF piezoelectric film, 6 and an outer frame.
Detailed Description
The following detailed description of the embodiments of the present invention will be given in order to provide those skilled in the art with a more complete, accurate and thorough understanding of the inventive concept and technical solutions of the present invention.
As shown in fig. 2 and 3, the structure of the present invention is a device applied to a PVDF piezoelectric film-based tactile sensation method, and includes an anode electrode 1, a PVDF piezoelectric film 5, and a cathode electrode.
Aiming at the defects of the prior art, the invention provides a detection method according to the resonance frequency of the PVDF piezoelectric film, which can detect the moment when the force load is increased and can also detect the existence and the continuation of the force load. The invention takes the active sensing human-computer interaction equipment as a starting point, takes the PVDF piezoelectric film as a measuring unit, senses the static touch and the sliding of fingers by detecting the resonance frequency of the PVDF piezoelectric film, and is expected to provide novel, convenient and comfortable human-computer interaction equipment for the human-computer interaction technology.
Specifically, the method comprises the following steps: in order to solve the problems in the prior art, overcome the defects and realize the invention aim of sensing the existence and the persistence of finger load and the sliding of fingers, the invention adopts the technical scheme that:
as shown in fig. 2 to 3, the PVDF piezoelectric film-based tactile sensation method of the present invention includes disposing the PVDF piezoelectric film 5 in a tactile sensation device; when a finger touches the device, the PVDF piezoelectric film 5 working in a resonance state is acted by the finger force, and the resonance frequency of the PVDF piezoelectric film is changed; the change of the resonant frequency of the PVDF piezoelectric film is measured and analyzed, so that the touch state of the finger is sensed.
The method and the device are mainly used for sensing static touch and sliding of fingers, and are applied to mobile phones, game pads and the like. The main principle is as follows: when a finger touches the device, the PVDF piezoelectric film working in a resonance state is subjected to pressure load, and the resonance frequency of the PVDF piezoelectric film can be changed. The change of the resonant frequency of the PVDF piezoelectric film is measured and analyzed, so that the touch state of the finger is sensed. Compared with the traditional method for measuring the voltage output of the PVDF piezoelectric film, the method for measuring the resonant frequency of the PVDF piezoelectric film can sense the instant of finger touch and can also sense the static touch of the finger.
Arraying the PVDF piezoelectric films 5; by measuring and analyzing the resonance frequency of each PVDF piezoelectric film 5 respectively, the finger sliding can be sensed.
If the corresponding position of the PVDF piezoelectric film is touched and has correlation with time, for example, a touch is detected at the position A1 at the beginning, then a touch is detected at the adjacent position A2, and then a touch is detected at the adjacent position A3, which indicates that the finger slides from the position A1 to the position A3.
As shown in fig. 1, the PVDF piezoelectric film 5 is used to measure static touch and sliding of a finger, and the PVDF piezoelectric film-based tactile sensation method of the invention includes the steps of:
step S1: a finger makes a static touch or slide on the device;
step S2: the device transmits the pressure to the PVDF piezoelectric film (5) under the pressure load of the fingers, and the resonance frequency of the PVDF piezoelectric film (5) is changed under the pressure load;
and step S3: comparing the detected resonant frequency with a resonant frequency recorded in advance when the touch is not made; if the resonant frequency of one PVDF piezoelectric film 5 changes obviously, it indicates that the PVDF piezoelectric film 5 is touched at the moment;
and step S4: returning the state of each PVDF piezoelectric film 5 according to the step S3;
step S5: and judging whether the finger slides according to the steps S3 and S4.
In the step S4, if the resonance frequency of the PVDF piezoelectric film 5 is changed and then returns to the initial state, it indicates that the position corresponding to the PVDF piezoelectric film 5 is touched; if the resonance frequency of the PVDF piezoelectric film 5 is changed and the changed resonance frequency is maintained, the corresponding position of the PVDF piezoelectric film 5 is touched and the finger does not leave.
In the step S5, if the touched position change corresponding to the PVDF piezoelectric film 5 is correlated with time, it indicates that the finger is sliding at different positions.
The key device in the prior art can only identify the time when the key is pressed, but the invention can identify the time when the finger just touches the device, and can also identify two states of the device which is not touched by the finger and the device which is touched by the finger; and the PVDF piezoelectric films are arrayed, and the resonance frequency of each PVDF piezoelectric film is respectively measured and analyzed, so that the finger sliding can be sensed.
In order to achieve the same purpose as the technical scheme, the invention also provides a device of the touch perception method based on the PVDF piezoelectric film, which has the technical scheme that:
as shown in fig. 2, the structure of the device is three layers, the upper layer is a distribution array of a plurality of unconnected anode electrodes 1, the middle layer is the PVDF piezoelectric film 5, and the lower layer is a common cathode electrode.
The technical scheme adopts a special structure to install the PVDF piezoelectric film 5, and the tensile strength and the compressive strength of the structure are related to the section size of the structure; the smaller the cross-sectional area, the smaller the strength, and the more easily the deformation occurs. The structure can make the PVDF piezoelectric film 5 more sensitive to the response of pressing force, and improve the sensitivity of the device; and each PVDF piezoelectric film 5 can also have an isolation effect, so that interference is reduced.
Each anode electrode 1 is respectively connected with an anode electrode outer end 3 through an anode electrode lead 2; the common cathode electrode is connected with the outer end 4 of the common cathode of the PVDF piezoelectric film through a cathode electrode lead.
The outer end 3 of the anode electrode and the outer end 4 of the PVDF piezoelectric film common cathode are both used for connecting a signal circuit and a detection control unit.
Two ends of the PVDF piezoelectric film 5 are respectively provided with a rapid frequency measuring circuit.
The rapid frequency measurement circuit adopts a Hilbert transform detection method or a Kalman filtering method to rapidly measure the change of the instantaneous frequency of the PVDF piezoelectric film 5.
The PVDF piezoelectric film 5 is integrated on the inner side of the outer frame 6 of the electronic product, and a key does not need to be arranged, so that the consistency of the overall appearance is better, and the hand feeling is more comfortable.
According to the structure of the device, the PVDF piezoelectric film 5 can be integrated in related electronic products, for example, the inner side of a mobile phone frame, so that a key can be omitted, the consistency of the overall appearance is better, and the hand feeling is more comfortable.
Fig. 4 shows the outer frame 6 of the electronic product, and fig. 5 shows a part a of fig. 4, which is a position where the PVDF piezoelectric film array is mounted.
The PVDF piezoelectric film material is used as a measuring unit, and has good chemical resistance, processability, fatigue resistance and creep resistance.
The present invention has been described in detail with reference to the accompanying drawings, and it is to be understood that the invention is not limited to the specific embodiments described above, and that various insubstantial modifications of the inventive concepts and solutions, or their direct application to other applications without modification, are intended to be covered by the scope of the invention.
Claims (10)
1. A method for tactile perception based on a PVDF piezoelectric film, the PVDF piezoelectric film (5) being disposed in a tactile perception device, the method comprising: when a finger touches the device, the PVDF piezoelectric film (5) working in a resonance state is acted by the finger force, and the resonance frequency of the PVDF piezoelectric film changes; the change of the resonant frequency of the PVDF piezoelectric film is measured and analyzed, so that the touch state of the finger is sensed.
2. The PVDF-based piezoelectric film tactile sensation method according to claim 1, wherein: arraying the PVDF piezoelectric films (5); by respectively measuring and analyzing the resonance frequency of each PVDF piezoelectric film (5), the finger sliding can be sensed.
3. The PVDF-based piezoelectric film tactile sensation method according to claim 1, wherein: the method comprises the following steps:
step S1: a finger makes a static touch or slide on the device;
step S2: the device transmits the pressure to the PVDF piezoelectric film (5) under the pressure load of the finger, and the resonance frequency of the PVDF piezoelectric film (5) is changed under the pressure load;
and step S3: comparing the detected resonant frequency with a resonant frequency recorded in advance when the touch is not made; if the resonant frequency of one PVDF piezoelectric film (5) is obviously changed, the PVDF piezoelectric film (5) is touched at the moment;
and step S4: returning the state of each PVDF piezoelectric film (5) according to the step S3;
step S5: and judging whether the finger slides according to the steps S3 and S4.
4. The PVDF-based piezoelectric film tactile sensation method according to claim 3, wherein: in the step S4, if the resonance frequency of the PVDF piezoelectric film (5) is changed and then returns to the initial state, it indicates that the position corresponding to the PVDF piezoelectric film (5) is touched; if the resonance frequency of the PVDF piezoelectric film (5) is changed and the changed resonance frequency is maintained, the corresponding position of the PVDF piezoelectric film (5) is touched and the finger does not leave.
5. The PVDF-based piezoelectric film tactile sensation method according to claim 3, wherein: in the step S5, if the change of the touched position corresponding to the PVDF piezoelectric film (5) is correlated with the time, the finger slides at different positions.
6. Device using the PVDF piezoelectric film-based haptic perception method according to any of the claims from 1 to 5, characterized in that: the device is structurally characterized by comprising three layers, wherein the upper layer is a distribution array of a plurality of unconnected anode electrodes (1), the middle layer is the PVDF piezoelectric film (5), and the lower layer is a common cathode electrode.
7. The device for tactile perception using PVDF-based piezoelectric films according to claim 6, wherein: each anode electrode (1) is respectively connected with the outer end (3) of the anode electrode through an anode electrode lead (2); the common cathode electrode is connected with the outer end (4) of the common cathode of the PVDF piezoelectric film through a cathode electrode lead.
8. The device for tactile perception using PVDF-based piezoelectric films according to claim 6, wherein: and two ends of the PVDF piezoelectric film (5) are respectively provided with a quick frequency measuring circuit.
9. The device for tactile perception using PVDF-based piezoelectric thin film according to claim 8, wherein: the quick frequency measurement circuit adopts a Hilbert transform detection method or a Kalman filtering method to quickly measure the change of the instantaneous frequency of the PVDF piezoelectric film (5).
10. The device for tactile perception using PVDF-based piezoelectric films according to claim 6, wherein: the PVDF piezoelectric film (5) is integrated on the inner side of an outer frame (6) of an electronic product, and a key does not need to be arranged, so that the consistency of the overall appearance is better, and the hand feeling is more comfortable.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211027209.8A CN115328384A (en) | 2022-08-25 | 2022-08-25 | Touch sensing method and device based on PVDF piezoelectric film |
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| CN202211027209.8A CN115328384A (en) | 2022-08-25 | 2022-08-25 | Touch sensing method and device based on PVDF piezoelectric film |
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