CN107239171A - The method of electric capacity touch screen system and respective handling pressure detecting based on piezoelectric - Google Patents
The method of electric capacity touch screen system and respective handling pressure detecting based on piezoelectric Download PDFInfo
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- CN107239171A CN107239171A CN201710440018.7A CN201710440018A CN107239171A CN 107239171 A CN107239171 A CN 107239171A CN 201710440018 A CN201710440018 A CN 201710440018A CN 107239171 A CN107239171 A CN 107239171A
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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
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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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
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
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Abstract
The invention discloses a kind of electric capacity touch screen system based on piezoelectric, it includes front end touch Panel and back-end circuit, and front end touch Panel includes capacitance detecting part and pressure detecting part；The signal output part of the capacitance detecting part and pressure detecting part is connected with the signal input part of back-end circuit.The invention also discloses the method for the processing pressure realized using above-mentioned electric capacity touch screen system detection, using the method for inserting pressure value proportionality factor form in memory cell in advance, in actual use to system detectio to pressure value calculated, revised.The hardware configuration of the present invention is simple, and the increase of energy consumption is reduced while system complexity is not increased, and the method used can effectively improve the touch screen accuracy of touch screen system, improves Consumer's Experience.The present invention suitable for the electric capacity touch screen system based on piezoelectric processing pressure detect.
Description
Technical field
The invention belongs to technical field of electronic equipment, the Consumer's Experience for improving touch screen system is specifically a kind of
Electric capacity touch screen system based on piezoelectric and the method for the processing pressure detection using its realization.
Background technology
With the development of science and technology electronic device field future will be turned into using the electric capacity touch screen system based on piezoelectric
The trend of development.
Be limited to the self property of piezoelectric, and capacitive touch screen board mechanical features, when the power of onesize dynamics
When being applied to the diverse location of touch screen version, the charge number produced on battery lead plate is different, as shown in figure 1, being 1mm touching radius
When, with the diverse location of 1N force touch screen, the pressure values measured are different；Apply formed objects even in same position
Power, when different with touch screen plate contact area, the pressure of effect on the piezoelectric materials can different, therefore generation on battery lead plate
Charge number it is also different.
In above-mentioned two situations, reading circuit can read out different size of dynamics, then the control list of touch screen system
Member can send different control commands, and touch Panel can show different feedback results, and this directly affects Consumer's Experience, long and
Long can cause immeasurable loss to raw manufacturer.
The content of the invention
The present invention is intended to provide a kind of electric capacity touch screen system based on piezoelectric and using at the electric capacity touch screen system
The method for managing pressure detecting, to can solve the problem that the above mentioned problem present in prior art.
To achieve the above object, the technical scheme used is as follows by the present invention：
A kind of electric capacity touch screen system based on piezoelectric, it includes front end touch Panel and back-end circuit, the front end touch screen
Panel includes capacitance detecting part and pressure detecting part；
The signal output part of the capacitance detecting part and pressure detecting part is connected with the signal input part of back-end circuit.
It is used as restriction：The front end touch Panel includes exciting electrode layer, the piezoelectric material layer set gradually from top to bottom
With ground electrode layer；
The piezoelectric material layer is as dielectric layer, the composition electric capacity inspection together with exciting electrode layer and ground electrode layer as battery lead plate
Survey part；Piezoelectric material layer is as pressure detecting layer, the decomposition pressure detection part together with exciting electrode layer and ground electrode layer.
It is used as second of restriction：The front end touch Panel includes piezoelectric material layer, the excitation set gradually from top to bottom
Electrode layer, insulating barrier and ground electrode layer；
The exciting electrode layer, insulating barrier and ground electrode layer constitute capacitance detecting part together；
Piezoelectric material layer and the exciting electrode layer constitutes pressure detecting part together.
It is used as the third restriction：The back-end circuit includes the first reading circuit, signal processing circuit, the first data storage
Unit and the first control unit；Wherein,
The signal input part of first reading circuit and the signal output part phase of the capacitance detecting part, pressure detecting part
Even, the signal output part of the first reading circuit is connected with the signal input part of signal processing circuit, the storage of signal processing circuit
Signal output port is connected with the storage signal input port of the first data storage cell, the control letter of the first data storage cell
Number input is connected with the inquiry signal output part of the first control unit, the signal output part of the first data storage cell and first
The historical signal input of control unit is connected.
It is used as the 4th kind of restriction：The back-end circuit is deposited including the second reading circuit, the second control unit and the second data
Storage unit；
The signal input part of second reading circuit and the signal output part phase of the capacitance detecting part, pressure detecting part
Even, the signal output part of the second reading circuit is connected with the reading signal input part of the second control unit, the second data storage list
The signal output part of member is connected with the historical signal input of the second control unit, and the control signal of the second data storage cell is defeated
Enter end with the inquiry signal output part of the second control unit to be connected.
It is used as the further restriction of the third restriction：First reading circuit include be sequentially connected in series charge amplifier/
Voltage amplifier, filter unit, AD conversion unit and data selector, wherein filter unit include LPF list in parallel
Member and bandpass filtering unit；AD conversion unit includes the first AD conversion unit and the second AD conversion unit in parallel,
The signal output part of the capacitance detecting part and the signal output part of pressure detecting part, with charge amplifier/electricity
The signal input part of amplifier is pressed to be connected；The signal input part of low-pass filter unit and the signal input part of bandpass filtering unit,
Signal output part with charge amplifier/voltage amplifier is connected, the signal output part of low-pass filter unit and the first modulus
The input end of analog signal of converting unit is connected, the simulation of the signal output part of bandpass filtering unit and the second AD conversion unit
Signal input part is connected；The data signal of the digital signal output end of first AD conversion unit and the second AD conversion unit is defeated
Go out end, be connected with the signal input part of data selector, the signal output part of data selector and the letter of signal processing circuit
Number input is connected.
It is used as the further restriction of the 4th kind of restriction：Second reading circuit includes charge amplifier/voltage of series connection
Amplifier and AD conversion unit；
The signal output part of the capacitance detecting part and the signal output part of pressure detecting part, with charge amplifier/electricity
The signal input part of amplifier is pressed to be connected, the signal output part of charge amplifier/voltage amplifier and the mould of AD conversion unit
Intend signal input part to be connected, the digital signal output end of AD conversion unit is connected with the signal input part of the second control unit.
A kind of method for the processing pressure detection realized in the electric capacity touch screen system based on piezoelectric, it uses above-mentioned base
Realized in the electric capacity touch screen system of piezoelectric, including the following steps carried out successively：
First, when there is touch action generation, back-end circuit collects the telecommunications for touching radius correlation that capacitance detecting part is detected
Number, the related electric signal of touch location, and the electric signal of pressure correlation that pressure detecting portion go-on-go is measured；
2nd, back-end circuit is by be collected into three kinds of electric signal working processes；
3rd, back-end circuit is searched according to the working process result of step 2 from the pressure value proportionality factor form of itself storage
Corresponding pressure value proportionality factor and working process result to step 2 are calculated, revision, form final pressure value；
4th, final pressure value is further processed control unit, exports corresponding control signal.
As restriction, the preparation method of the pressure value proportionality factor form is carried out successively according to following steps：
(1) in the case of radius identical is touched, an equal amount of dynamics is applied in the diverse location of front end touch Panel, point
The magnitude of voltage obtained in other tracer signal process circuit, a voltage is organized into by the magnitude of voltage of record according to touch location numbering
Value matrix；
(2) the voltage value matrix obtained in step (1) is done into normalized；
(3) touch radius, repeat step (one) and step (2) is varied multiple times, a series of electricity after normalizeds is obtained
Press value matrix；
(4) the voltage value matrix after a series of obtained normalizeds is made into form and is stored in data storage cell
In；
The form is pressure value proportionality factor form.
As further restriction, the step (1) includes the following steps carried out successively：
When (a) touch action occurs, produced on charge amplifier/voltage amplifier collection exciting electrode layer, piezoelectric material layer
Electric signal after zoom into analog voltage signal, and result is exported to low-pass filter unit and bandpass filtering unit；
The analog voltage signal received is processed as simulated pressure signal by (b) low-pass filter unit, and is exported to the first modulus
The analog voltage signal received is processed as artificial capacitor signal and exported to the second analog-to-digital conversion by converting unit, bandpass filter
Unit；
The simulated pressure signal received is converted into (c) the first AD conversion unit into data signal and output is selected to data are entered
Device, meanwhile, the artificial capacitor signal received is changed into data signal and exported to data selector by the second AD conversion unit；
(d) data selector to signal processing circuit, is handled the data signal received selection output by signal processing circuit
The magnitude of voltage of magnitude of voltage and corresponding touch location correlation for pressure correlation, the magnitude of voltage for touching radius correlation；
The result of (e) recording step (d), and correspond numbering and be organized into a voltage value matrix.
As second of restriction, the preparation method of the pressure value proportionality factor form is carried out according to following steps order：
1. in the case of radius identical is touched, an equal amount of dynamics is applied in the diverse location of front end touch Panel, respectively
The magnitude of voltage that record control unit is obtained, and it is organized into a voltage value matrix according to touch location numbering；
2. by step 1. in obtained voltage value matrix do normalized；
3. be varied multiple times touch radius, repeat step 1. with step 2., obtain a series of magnitude of voltage square after normalizeds
Battle array；
4., the voltage value matrix after a series of obtained normalizeds is made into form and is stored in the second data storage list
In member；
The form is pressure value proportionality factor form.
As the further restriction of second of restriction, 1. the step includes the following steps carried out successively：
1. a, when touch action occurs, is produced on charge amplifier/voltage amplifier collection exciting electrode layer, piezoelectric material layer
Analog voltage signal is zoomed into after electric signal and exports result to AD conversion unit；
The analog voltage signal received is converted into data signal and exports result to the second control by 1. b, AD conversion unit
Unit；
1. c, the second control unit utilizes the LPF algorithm itself stored, is pressure letter by the Digital Signal Processing received
Number, meanwhile, the bandpass filtering algorithm that the second control unit is stored using itself believes the Digital Signal Processing received for electric capacity
Number, the pressure signal is exactly the electric signal of pressure correlation, and the capacitance signal is exactly the voltage signal with the pressure correlation
The related electric signal of corresponding touch location, the electric signal for touching radius correlation；
1. d, recording step 1. c result, and correspond numbering and be organized into a voltage value matrix.
It is used as the third restriction：Calculated described in step 3, revise the completion in signal processing circuit.
It is used as the 4th kind of restriction：Calculated described in step 3, revise the completion in the second control unit.
The present invention as a result of above-mentioned technical scheme, its compared with prior art, acquired technological progress is：
(1) the invention provides the electric capacity touch screen system based on piezoelectric, on the one hand the characteristic by the use of piezoelectric is used as electricity
Hold the dielectric layer of detection part, on the other hand constitute pressure detecting part together with exciting electrode layer, do not increasing system complex
The increase of energy consumption is reduced while property；
(2) method that use of the invention inserts pressure value proportionality factor form in memory cell in advance, right in actual use
System detectio to pressure value calculated, revised, the counting accuracy of touch screen pressure value can be effectively improved, user's body is lifted
Test；(3) method of the invention is succinct, rigorous, it is easy to accomplish.
The present invention and lifts user suitable for processing pressure is detected the electric capacity touch screen system based on piezoelectric with this
Experience.
Brief description of the drawings
Accompanying drawing is used for providing a further understanding of the present invention, and constitutes a part for specification, the reality with the present invention
Applying example is used to explain the present invention together, is not construed as limiting the invention.
In the accompanying drawings：
When Fig. 1 is that touch radius is identical, the pressure values graphics that same dynamics is obtained is applied in screen diverse location；
Fig. 2 is the front end touch Panel partial structural diagram of the embodiment of the present invention 1；
Fig. 3 is the electrical schematic diagram of the embodiment of the present invention 1；
Fig. 4 is the front end touch Panel partial structural diagram of the embodiment of the present invention 2；
Fig. 5 is the electrical schematic diagram of the embodiment of the present invention 2；
Fig. 6 is touch sampling schematic diagram in the first step of the embodiment of the present invention 3 and 4；
In figure：1st, exciting electrode layer, 2, piezoelectric material layer, 3, ground electrode layer, 4, insulating barrier.
Embodiment
The preferred embodiments of the present invention are illustrated below in conjunction with accompanying drawing.It should be appreciated that preferred reality described herein
Apply example to be merely to illustrate and explain the present invention, be not intended to limit the present invention.
Electric capacity touch screen system of the embodiment 1 based on piezoelectric
The present embodiment includes front end touch Panel and the first back-end circuit；
Reference picture 2, front end touch Panel includes exciting electrode layer 1, piezoelectric material layer 2 and the ground electrode set gradually from top to bottom
Layer 3 is constituted；Piezoelectric material layer 2 constitutes electricity as dielectric layer together with exciting electrode layer 1 and ground electrode layer 3 as battery lead plate
Hold detection part；Piezoelectric material layer 2 is as pressure detecting layer, and decomposition pressure is detected together with exciting electrode layer 1 and ground electrode layer 3
Part；
Reference picture 3, the first back-end circuit includes the first reading circuit, signal processing circuit, the first data storage cell and first
Control unit；Wherein, the charge amplifier/voltage amplifier, filter unit, modulus that the first reading circuit includes being sequentially connected in series turn
Unit and data selector are changed, filter unit includes low-pass filter unit and bandpass filtering unit in parallel；AD conversion unit
Including the first AD conversion unit and the second AD conversion unit in parallel；
The signal output part of capacitance detecting part and the signal output part of pressure detecting part, put with charge amplifier/voltage
The signal input part of big device is connected；The signal input part of low-pass filter unit and the signal input part of bandpass filtering unit, with
The signal output part of charge amplifier/voltage amplifier is connected, the signal output part of low-pass filter unit and the first analog-to-digital conversion
The input end of analog signal of unit is connected, the analog signal of the signal output part of bandpass filtering unit and the second AD conversion unit
Input is connected；The data signal output of the digital signal output end of first AD conversion unit and the second AD conversion unit
End, is connected with the signal input part of data selector, the signal output part of data selector and the signal of signal processing circuit
Input is connected；The storage signal output port and the storage signal input port of the first data storage cell of signal processing circuit
It is connected, the control signal input of the first data storage cell is connected with the inquiry signal output part of the first control unit, first
The signal output part of data storage cell is connected with the historical signal input of the first control unit.
In the present embodiment, front end touch Panel also exploit with structure as shown in Figure 4 constitute capacitance detecting part and
Front end touch Panel includes piezoelectric material layer 2, the exciting electrode set gradually from top to bottom in pressure detecting part, this structure
Layer 1, insulating barrier 4 and ground electrode layer 3, exciting electrode layer 1, insulating barrier 4 and ground electrode layer 3 constitute capacitance detecting part, pressure together
Material layer 2 and exciting electrode layer 1 constitute pressure detecting part together.
In the present embodiment, the first control unit is realized using hardware configuration same as the prior art.
Electric capacity touch screen system of the embodiment 2 based on piezoelectric
The present embodiment includes front end touch Panel and the second back-end circuit；
Reference picture 4, front end touch Panel includes the piezoelectric material layer 2, exciting electrode layer 1, insulating barrier 4 set gradually from top to bottom
With ground electrode layer 3；Exciting electrode layer 1, insulating barrier 4 and ground electrode layer 3 constitute capacitance detecting part together；The He of piezoelectric material layer 2
Exciting electrode layer 1 constitutes pressure detecting part together；
Reference picture 5, the second back-end circuit includes the second reading circuit, the second control unit and the second data storage cell；Wherein,
Second reading circuit includes the charge amplifier/voltage amplifier and AD conversion unit of series connection；
The signal output part of capacitance detecting part and the signal output part of pressure detecting part, put with charge amplifier/voltage
The signal input part of big device is connected, and the simulation of the signal output part and AD conversion unit of charge amplifier/voltage amplifier is believed
Number input is connected, and the digital signal output end of AD conversion unit is connected with the signal input part of the second control unit；Second
The signal output part of data storage cell is connected with the historical signal input of the second control unit, the second data storage cell
Control signal input is connected with the inquiry signal output part of the second control unit.
In the present embodiment, the second control unit is realized using hardware configuration same as the prior art, while in advance
Write LPF algorithm and bandpass filtering algorithm in the second control unit, the fractional hardware structure of the second control unit with it is low
Pass filter algorithm, bandpass filtering algorithm form low-pass filter unit and bandpass filtering unit together.
In the present embodiment, front end touch Panel can also be constituted using structure as shown in Figure 2 capacitance detecting part and
Front end touch Panel includes exciting electrode layer 1, the piezoelectric set gradually from top to bottom in pressure detecting part, this structure
Layer 2 and ground electrode layer 3, exciting electrode layer 1 and ground electrode of the one side of piezoelectric material layer 2 as dielectric layer, with being used as battery lead plate
Layer 3 constitutes capacitance detecting part together, and another aspect piezoelectric material layer 2 is used as pressure detecting layer and exciting electrode layer 1 and ground electricity
The decomposition pressure detection part together of pole layer 3.
The method that processing pressure is detected in the electric capacity touch screen system based on piezoelectric of embodiment 3
The present embodiment is realized using embodiment 1, including four carried out successively step：
The first step, when there is touch action generation, the first back-end circuit collects the touch radius phase that capacitance detecting part is detected
The related electric signal of the electric signal of pass, touch location, and the electric signal of pressure correlation that pressure detecting portion go-on-go is measured；
Second step, the first back-end circuit are by be collected into three kinds of electric signal working processes；
3rd step, the first back-end circuit are according to the working process result of step 2, the pressure value proportionality factor table stored from itself
Corresponding pressure value proportionality factor is searched in lattice and the working process result to step 2 is calculated, revised, final pressure is formed
Value；
The preparation method of above-mentioned pressure value proportionality factor form is carried out successively according to following steps：
(1) reference picture 6, in the case of radius identical is touched, apply an equal amount of in the diverse location of front end touch Panel
The magnitude of voltage of record is organized into by dynamics, the magnitude of voltage obtained respectively in tracer signal process circuit according to touch location numbering
One voltage value matrix；
The realization of this step includes the following steps carried out successively,
When (a) touch action occurs, produced on charge amplifier/voltage amplifier collection exciting electrode layer 1, piezoelectric material layer 2
Hybrid analog-digital simulation voltage signal is zoomed into after raw electric signal, and result is exported to low-pass filter unit and bandpass filtering unit；
The hybrid analog-digital simulation voltage signal received is processed as simulated pressure signal by (b) low-pass filter unit, and is exported to first
The hybrid analog-digital simulation voltage signal received is processed as artificial capacitor signal and exported to second by AD conversion unit, bandpass filter
AD conversion unit；
The simulated pressure signal received is converted into (c) the first AD conversion unit into data signal and output is selected to data are entered
Device, meanwhile, the artificial capacitor signal received is changed into data signal and exported to data selector by the second AD conversion unit；
(d) data selector to signal processing circuit, is handled the data signal received selection output by signal processing circuit
The magnitude of voltage of magnitude of voltage and corresponding touch location correlation for pressure correlation, the magnitude of voltage for touching radius correlation；
The result of (e) recording step (d), and correspond numbering and be organized into a voltage value matrix；
(2) the voltage value matrix obtained in step (1) is done into normalized；
(3) touch radius, repeat step (one) and step (2) is varied multiple times, a series of electricity after normalizeds is obtained
Press value matrix；
(4) the voltage value matrix after a series of obtained normalizeds is made into form and is stored in the first data storage
In unit；
The form is pressure value proportionality factor form；
Final pressure value is further processed 4th step, the first control unit, exports corresponding control signal；
In this step, the first control unit judges the intention of user according to the final pressure value received, then sends control
The corresponding unit response of system order control, this process is identical with prior art.
The number of repetition of step (3) is decided according to the actual requirements, and number of repetition is more, and obtained final pressure value is more smart
Really.
In the present embodiment, in the 3rd step calculating, revision is completed in signal processing circuit.
The method that processing pressure is detected in the electric capacity touch screen system based on piezoelectric of embodiment 4
The present embodiment is realized using embodiment 2, including four carried out successively step：
The first step, when there is touch action generation, the second back-end circuit collects the touch radius phase that capacitance detecting part is detected
The related electric signal of the electric signal of pass, touch location, and the electric signal of pressure correlation that pressure detecting portion go-on-go is measured；
Second step, the second back-end circuit are by be collected into three kinds of electric signal working processes；
3rd step, the second back-end circuit are according to the working process result of step 2, the pressure value proportionality factor table stored from itself
Corresponding pressure value proportionality factor is searched in lattice and the working process result to step 2 is calculated, revised, final pressure is formed
Value；
The preparation method of above-mentioned pressure value proportionality factor form is carried out successively according to following steps：
1. reference picture 6, in the case of radius identical is touched, an equal amount of power is applied in the diverse location of front end touch Panel
Degree, the magnitude of voltage that record control unit is obtained respectively, and it is organized into a voltage value matrix according to touch location numbering；
This step includes the following steps carried out successively,
1. a, when touch action occurs, is produced on charge amplifier/voltage amplifier collection exciting electrode layer 1, piezoelectric material layer 2
Electric signal after zoom into analog voltage signal and export result to AD conversion unit；
The analog voltage signal received is converted into data signal and exports result to the second control by 1. b, AD conversion unit
Unit；1. c, the second control unit utilizes the LPF algorithm itself stored, is pressure by the Digital Signal Processing received
Signal, meanwhile, the Digital Signal Processing received is electric capacity by the bandpass filtering algorithm that the second control unit is stored using itself
Signal, the pressure signal is exactly the electric signal of pressure correlation, and the capacitance signal is exactly the voltage letter with the pressure correlation
The related electric signal of number corresponding touch location, touch the related electric signal of radius；
1. d, recording step 1. c result, and correspond numbering and be organized into a voltage value matrix；
2. by step 1. in obtained voltage value matrix do normalized；
3. be varied multiple times touch radius, repeat step 1. with step 2., obtain a series of magnitude of voltage square after normalizeds
Battle array；
4., the voltage value matrix after a series of obtained normalizeds is made into form and is stored in the second data storage list
In member；
The form is pressure value proportionality factor form；
4th, final pressure value is further processed the second control unit, exports corresponding control signal；
In this step, the second control unit judges the intention of user according to the final pressure value received, then sends control
The corresponding unit response of system order control, this process is identical with prior art.
The number of repetition of step (3) is decided according to the actual requirements, and number of repetition is more, and obtained final pressure value is more smart
Really.
In the present embodiment, in the 3rd step calculating, revision is completed in the second control unit.
Finally it should be noted that：The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention,
Although the present invention is described in detail with reference to the foregoing embodiments, for those skilled in the art, it still may be used
To be modified to the technical scheme described in foregoing embodiments, or equivalent substitution is carried out to which part technical characteristic.
Within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc., should be included in power of the present invention
Within the scope of profit is claimed.
Claims (14)
1. a kind of electric capacity touch screen system based on piezoelectric, it includes front end touch Panel and back-end circuit, it is characterised in that：
The front end touch Panel includes capacitance detecting part and pressure detecting part；
The signal output part of the capacitance detecting part and pressure detecting part is connected with the signal input part of back-end circuit.
2. the electric capacity touch screen system according to claim 1 based on piezoelectric, it is characterised in that：The front end touch screen face
Plate includes the exciting electrode layer (1), piezoelectric material layer (2) and ground electrode layer (3) set gradually from top to bottom；
The piezoelectric material layer (2) is as dielectric layer, together with exciting electrode layer (1) and ground electrode layer (3) as battery lead plate
Constitute capacitance detecting part；Piezoelectric material layer (2) is as pressure detecting layer, together with exciting electrode layer (1) and ground electrode layer (3)
Decomposition pressure detection part.
3. the electric capacity touch screen system according to claim 1 based on piezoelectric, it is characterised in that：The front end touch screen face
Plate includes piezoelectric material layer (2), exciting electrode layer (1), insulating barrier (4) and the ground electrode layer (3) set gradually from top to bottom；
The exciting electrode layer (1), insulating barrier (4) and ground electrode layer (3) constitute capacitance detecting part together；
The piezoelectric material layer (2) and exciting electrode layer (1) constitute pressure detecting part together.
4. the electric capacity touch screen system based on piezoelectric according to claim 1-3 any one, it is characterised in that：It is described
Back-end circuit includes the first reading circuit, signal processing circuit, the first data storage cell and the first control unit；Wherein,
The signal input part of first reading circuit and the signal output part phase of the capacitance detecting part, pressure detecting part
Even, the signal output part of the first reading circuit is connected with the signal input part of signal processing circuit, the storage of signal processing circuit
Signal output port is connected with the storage signal input port of the first data storage cell, the control letter of the first data storage cell
Number input is connected with the inquiry signal output part of the first control unit, the signal output part of the first data storage cell and first
The historical signal input of control unit is connected.
5. the electric capacity touch screen system based on piezoelectric according to claim 1-3 any one, it is characterised in that：It is described
Back-end circuit includes the second reading circuit, the second control unit and the second data storage cell；
The signal input part of second reading circuit and the signal output part phase of the capacitance detecting part, pressure detecting part
Even, the signal output part of the second reading circuit is connected with the reading signal input part of the second control unit, the second data storage list
The signal output part of member is connected with the historical signal input of the second control unit, and the control signal of the second data storage cell is defeated
Enter end with the inquiry signal output part of the second control unit to be connected.
6. the electric capacity touch screen system according to claim 4 based on piezoelectric, it is characterised in that：Described first reads electricity
Road includes charge amplifier/voltage amplifier, filter unit, AD conversion unit and the data selector being sequentially connected in series, wherein
Filter unit includes low-pass filter unit and bandpass filtering unit in parallel；AD conversion unit includes the first modulus in parallel and turned
Unit and the second AD conversion unit are changed,
The signal output part of the capacitance detecting part and the signal output part of pressure detecting part, with charge amplifier/electricity
The signal input part of amplifier is pressed to be connected；The signal input part of low-pass filter unit and the signal input part of bandpass filtering unit,
Signal output part with charge amplifier/voltage amplifier is connected, the signal output part of low-pass filter unit and the first modulus
The input end of analog signal of converting unit is connected, the simulation of the signal output part of bandpass filtering unit and the second AD conversion unit
Signal input part is connected；The data signal of the digital signal output end of first AD conversion unit and the second AD conversion unit is defeated
Go out end, be connected with the signal input part of data selector, the signal output part of data selector and the letter of signal processing circuit
Number input is connected.
7. the electric capacity touch screen system according to claim 5 based on piezoelectric, it is characterised in that：The reading circuit bag
Include the charge amplifier/voltage amplifier and AD conversion unit of series connection；
The signal output part of the capacitance detecting part and the signal output part of pressure detecting part, with charge amplifier/electricity
The signal input part of amplifier is pressed to be connected, the signal output part of charge amplifier/voltage amplifier and the mould of AD conversion unit
Intend signal input part to be connected, the digital signal output end of AD conversion unit is connected with the signal input part of the second control unit.
8. a kind of method for the processing pressure detection realized in the electric capacity touch screen system based on piezoelectric, it uses claim
The electric capacity touch screen system based on piezoelectric described in 1-7 any one is realized, it is characterised in that it includes what is carried out successively
Following steps：
First, when there is touch action generation, back-end circuit collects the telecommunications for touching radius correlation that capacitance detecting part is detected
Number, the related electric signal of touch location, and the electric signal of pressure correlation that pressure detecting portion go-on-go is measured；
2nd, back-end circuit is by be collected into three kinds of electric signal working processes；
3rd, back-end circuit is searched according to the working process result of step 2 from the pressure value proportionality factor form of itself storage
Corresponding pressure value proportionality factor and working process result to step 2 are calculated, revision, form final pressure value；
4th, final pressure value is further processed control unit, exports corresponding control signal.
9. the method for the detection of the processing pressure in the electric capacity touch screen system based on piezoelectric according to claim 8, its
It is characterised by that the preparation method of the pressure value proportionality factor form is carried out successively according to following steps：
(1) in the case of radius identical is touched, an equal amount of dynamics is applied in the diverse location of front end touch Panel, point
The magnitude of voltage obtained in other tracer signal process circuit, a voltage is organized into by the magnitude of voltage of record according to touch location numbering
Value matrix；
(2) the voltage value matrix obtained in step (1) is done into normalized；
(3) touch radius, repeat step (one) and step (2) is varied multiple times, a series of electricity after normalizeds is obtained
Press value matrix；
(4) the voltage value matrix after a series of obtained normalizeds is made into form and is stored in data storage cell
In；
The form is pressure value proportionality factor form.
10. the method for the detection of the processing pressure in the electric capacity touch screen system based on piezoelectric according to claim 9, its
It is characterised by that the step (1) includes the following steps carried out successively：
When (a) touch action occurs, charge amplifier/voltage amplifier collects exciting electrode layer (1), piezoelectric material layer (2)
Analog voltage signal is zoomed into after the electric signal of upper generation, and result is exported to low-pass filter unit and bandpass filtering unit；
The analog voltage signal received is processed as simulated pressure signal by (b) low-pass filter unit, and is exported to the first modulus
The analog voltage signal received is processed as artificial capacitor signal and exported to the second analog-to-digital conversion by converting unit, bandpass filter
Unit；
The simulated pressure signal received is converted into data signal and exported to data to select by (c) the first AD conversion unit
Device, meanwhile, the artificial capacitor signal received is changed into data signal and exported to data selector by the second AD conversion unit；
(d) data selector to signal processing circuit, is handled the data signal received selection output by signal processing circuit
The magnitude of voltage of magnitude of voltage and corresponding touch location correlation for pressure correlation, the magnitude of voltage for touching radius correlation；
The result of (e) recording step (d), and correspond numbering and be organized into a voltage value matrix；
11. the method for the detection of the processing pressure in the electric capacity touch screen system based on piezoelectric according to claim 8, its
It is characterised by that the preparation method of the pressure value proportionality factor form is carried out successively according to following steps：
1. in the case of radius identical is touched, an equal amount of dynamics is applied in the diverse location of front end touch Panel, respectively
The magnitude of voltage that record control unit is obtained, and it is organized into a voltage value matrix according to touch location numbering；
2. by step 1. in obtained voltage value matrix do normalized；
3. be varied multiple times touch radius, repeat step 1. with step 2., obtain a series of magnitude of voltage square after normalizeds
Battle array；
4., the voltage value matrix after a series of obtained normalizeds is made into form and is stored in data storage cell
In；
The form is pressure value proportionality factor form；
12. the method for the detection of the processing pressure in the electric capacity touch screen system based on piezoelectric according to claim 11,
It is characterized in that 1. the step includes the following steps carried out successively：
1. a, when touch action occurs, charge amplifier/voltage amplifier collects exciting electrode layer (1), on piezoelectric material layer (2)
Analog voltage signal is zoomed into after the electric signal of generation and exports result to AD conversion unit；
The analog voltage signal received is converted into data signal and exports result to control unit by 1. b, AD conversion unit；
1. c, the second control unit utilizes the LPF algorithm itself stored, is pressure letter by the Digital Signal Processing received
Number, meanwhile, the bandpass filtering algorithm that the second control unit is stored using itself believes the Digital Signal Processing received for electric capacity
Number, the pressure signal is exactly the electric signal of pressure correlation, and the capacitance signal is exactly the voltage signal with the pressure correlation
The related electric signal of corresponding touch location, the electric signal for touching radius correlation；
1. d, recording step 1. c result, and correspond numbering and be organized into a voltage value matrix；
13. the method for the detection of the processing pressure in the electric capacity touch screen system based on piezoelectric according to claim 8, its
It is characterised by：Calculated described in step 3, revise the completion in signal processing circuit；
14. the method for the detection of the processing pressure in the electric capacity touch screen system based on piezoelectric according to claim 8, its
It is characterised by：Calculated described in step 3, revise the completion in the second control unit.
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| CN111682871A (en) * | 2020-06-04 | 2020-09-18 | 西南大学 | Touch key capable of preventing false triggering |
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| US20160179276A1 (en) * | 2014-12-23 | 2016-06-23 | Cambridge Touch Technologies Ltd. | Pressure-Sensitive Touch Panel |
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| CN1826576A (en) * | 2003-07-21 | 2006-08-30 | 皇家飞利浦电子股份有限公司 | Touch sensitive display for a portable device |
| CN101782826A (en) * | 2009-01-19 | 2010-07-21 | 义隆电子股份有限公司 | Capacitance type touch pad and module thereof |
| CN104953977A (en) * | 2014-03-27 | 2015-09-30 | 精工爱普生株式会社 | Method of adjusting frequency of resonation device and method of manufacturing resonation device |
| US20160179276A1 (en) * | 2014-12-23 | 2016-06-23 | Cambridge Touch Technologies Ltd. | Pressure-Sensitive Touch Panel |
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