CN107239171B - The method of capacitance touch screen system and respective handling pressure detecting based on piezoelectric - Google Patents
The method of capacitance touch screen system and respective handling pressure detecting based on piezoelectric Download PDFInfo
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- CN107239171B CN107239171B CN201710440018.7A CN201710440018A CN107239171B CN 107239171 B CN107239171 B CN 107239171B CN 201710440018 A CN201710440018 A CN 201710440018A CN 107239171 B CN107239171 B CN 107239171B
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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 capacitance 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 detection realized using above-mentioned capacitance touch screen system, using the method for inserting pressure value proportionality factor form in storage unit 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 used method can effectively improve the touch screen accuracy of touch screen system, improve user experience.The present invention suitable for the capacitance touch screen system based on piezoelectric processing pressure detect.
Description
Technical field
It is specifically a kind of for improving the user experience of touch screen system the invention belongs to technical field of electronic equipment
Capacitance 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 become using the capacitance touch screen system based on piezoelectric
The trend of development.
The self property of piezoelectric, and the mechanical features of capacitive touch screen board are limited to, when the power of onesize dynamics
When being applied to the diverse location of touch screen version, the charge number produced on electrode plate is different, as shown in Figure 1, being 1mm touching radius
When, with the diverse location of the force touch screen of 1N, the pressure values measured are different；Apply formed objects even in same position
Power, when different with touch screen plate contact area, the pressure acted on the piezoelectric materials can be different, therefore is produced on electrode 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, this directly affects user experience, long and
Long can give raw manufacturer to cause immeasurable loss.
The content of the invention
The present invention is intended to provide a kind of capacitance touch screen system based on piezoelectric and using at the capacitance touch screen system
The method for managing pressure detecting, to which the above problem present in the prior art can be solved.
To achieve the above object, used technical solution is as follows by the present invention：
A kind of capacitance touch screen system based on piezoelectric, it includes front end touch Panel and back-end circuit, the front end
Touch Panel includes capacitance detecting part and pressure detecting part；
Signal input part phase of the signal output part of the capacitance detecting part and pressure detecting part with back-end circuit
Even.
As restriction：The front end touch Panel includes excitation electrode layer, the piezoelectric material layer set gradually from top to bottom
With ground electrode layer；
The piezoelectric material layer forms electricity as dielectric layer together with the excitation electrode layer and ground electrode layer as electrode plate
Hold detection part；Piezoelectric material layer is as pressure detecting layer, the decomposition pressure test section together with excitation electrode layer and ground electrode layer
Point.
As second of restriction：The front end touch Panel includes piezoelectric material layer, the excitation set gradually from top to bottom
Electrode layer, insulating layer and ground electrode layer；
Excitation electrode layer, insulating layer and the ground electrode layer form capacitance detecting part together；
The piezoelectric material layer and excitation electrode layer form pressure detecting part together.
As the third restriction：The back-end circuit includes the first reading circuit, signal processing circuit, the storage of the first data
Unit and the first control unit；Wherein,
The signal input part of first reading circuit and the capacitance detecting part, the signal output of pressure detecting part
End is connected, and the signal output part of the first reading circuit is connected with the signal input part of signal processing circuit, signal processing circuit
Storage signal output port is connected with the storage signal input port of the first data storage cell, the control of the first data storage cell
Signal input part processed is connected with the inquiry signal output part of the first control unit, the signal output part of the first data storage cell with
The historical signal input terminal of first control unit is connected.
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 capacitance detecting part, the signal output of pressure detecting part
End is connected, and the signal output part of the second reading circuit is connected with the reading signal input part of the second control unit, and the second data are deposited
The signal output part of storage unit is connected with the historical signal input terminal of the second control unit, the control letter of the second data storage cell
Number input terminal is connected with the inquiry signal output part of the second control unit.
Further as the third restriction limits：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 low-pass filtering 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, amplify with electric charge
The signal input part of device/voltage amplifier is connected；The signal input part of low-pass filter unit and the signal of bandpass filtering unit are defeated
Enter end, the signal output part with charge amplifier/voltage amplifier is connected, the signal output part of low-pass filter unit and first
The input end of analog signal of AD conversion unit is connected, the signal output part of bandpass filtering unit and the second AD conversion unit
Input end of analog signal is connected；The numeral letter of the digital signal output end of first AD conversion unit and the second AD conversion unit
Number output terminal, is connected with the signal input part of data selector, the signal output part and signal processing circuit of data selector
Signal input part be connected.
Limited as the 4th kind of the further 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, amplify with electric charge
The signal input part of device/voltage amplifier is connected, the signal output part and AD conversion unit of charge amplifier/voltage amplifier
Input end of analog signal be connected, the digital signal output end of AD conversion unit and the signal input part phase of the second control unit
Even.
A kind of method for the processing pressure detection realized in the capacitance touch screen system based on piezoelectric, it uses above-mentioned base
Realized in the capacitance touch screen system of piezoelectric, including the following steps carried out successively：
First, when there is touch action generation, it is relevant that back-end circuit collects the touch radius that capacitance detecting part detects
The relevant electric signal of electric signal, touch location, and the electric signal of pressure correlation that pressure detecting portion sorting measures；
2nd, back-end circuit is by be collected into three kinds of electric signal working processes；
3rd, back-end circuit according to the working process of step 2 as a result, from the pressure value proportionality factor form that itself is stored
Search corresponding pressure value proportionality factor and the working process result to step 2 is calculated, revised, form final pressure value；
4th, final pressure value is further processed in control unit, exports corresponding control signal.
As restriction, the production method of the pressure value proportionality factor form carries out successively according to following steps：
(1) in the case where touch radius is identical, an equal amount of power is applied in the diverse location of front end touch Panel
Degree, the magnitude of voltage obtained respectively in tracer signal process circuit, one is organized into by the magnitude of voltage of record according to touch location numbering
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, after obtaining a series of normalizeds
Voltage value matrix；
(4) the voltage value matrix after a series of obtained normalizeds is made into form and is stored in data storage
In unit；
The form, that is, pressure value proportionality factor form.
Limited as further, the step (1) includes the following steps carried out successively：
When (a) touch action occurs, on charge amplifier/voltage amplifier collection excitation electrode layer, piezoelectric material layer
Analog voltage signal is zoomed into after the electric signal of generation, and result is exported to low-pass filter unit and bandpass filtering unit；
The processing of received analog voltage signal is simulated pressure signal by (b) low-pass filter unit, and is exported to first
AD conversion unit, bandpass filter for artificial capacitor signal and export the processing of received analog voltage signal to the second modulus
Converting unit；
Received simulated pressure signal is converted into digital signal and exported to entering data by (c) the first AD conversion unit
Selector, meanwhile, received artificial capacitor signal is changed into digital signal and exported to data and selected by the second AD conversion unit
Select device；
(d) data selector exports the selection of received digital signal to signal processing circuit, by signal processing circuit
Handle magnitude of voltage and the relevant magnitude of voltage of corresponding touch location for pressure correlation, touch the relevant magnitude of voltage of radius；
(e) recording step (d) as a result, and corresponding numbering and being organized into a voltage value matrix.
As second of restriction, the production method of the pressure value proportionality factor form is carried out according to following steps order：
1. in the case where touch radius is identical, apply an equal amount of dynamics in the diverse location of front end touch Panel,
The magnitude of voltage that record control unit obtains respectively, 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. touch radius is varied multiple times, repeat step 1. with step 2., obtain a series of voltage after normalizeds
Value matrix；
Deposited 4. making form and being stored in the second data the voltage value matrix after a series of obtained normalizeds
In storage unit；
The form, that is, pressure value proportionality factor form.
Further as second of restriction limits, 1. the step includes the following steps carried out successively：
1. a, when touch action occurs, is produced on charge amplifier/voltage amplifier collection excitation electrode layer, piezoelectric material layer
Analog voltage signal is zoomed into after raw electric signal and exports result to AD conversion unit；
1. b, received analog voltage signal is converted into digital signal and exports result to second by AD conversion unit
Control unit；
1. c, the second control unit utilizes the low-pass filtering algorithm itself stored, is pressure by received Digital Signal Processing
Force signal, meanwhile, received Digital Signal Processing is electricity using the bandpass filtering algorithm itself stored by the second control unit
Hold signal, the pressure signal is exactly the electric signal of pressure correlation, and the capacitance signal is exactly the voltage with the pressure correlation
The relevant electric signal of the corresponding touch location of signal, touch the relevant electric signal of radius；
1. d, recording step 1. c's as a result, and corresponding numbering and being organized into a voltage value matrix.
As the third restriction：Calculated described in step 3, revise and completed in signal processing circuit.
As the 4th kind of restriction：Calculated described in step 3, revise and completed in the second control unit.
The present invention as a result of above-mentioned technical solution, its compared with prior art, acquired technological progress is：
(1) the present invention provides the capacitance touch screen system based on piezoelectric, on the one hand made using the characteristic of piezoelectric
For the dielectric layer of capacitance detecting part, pressure detecting part on the other hand is formed with together with excitation electrode layer, is not increasing system
Reduce the increase of energy consumption while complexity；
(2) method that use of the invention inserts pressure value proportionality factor form in storage unit in advance, is actually using
In to system detectio to pressure value calculated, revised, the counting accuracy of touch screen pressure value can be effectively improved, lifting is used
Experience at family；(3) method of the invention is succinct, rigorous, it is easy to accomplish.
The present invention suitable for the capacitance touch screen system based on piezoelectric processing pressure detect, and user is lifted with this
Experience.
Brief description of the drawings
Attached drawing is used for providing a further understanding of the present invention, and a part for constitution instruction, the reality with the present invention
Apply example to be used to explain the present invention together, be not construed as limiting the invention.
In the accompanying drawings：
When Fig. 1 is that touch radius is identical, in the pressure values graphics that the same dynamics of screen diverse location application obtains；
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 that sampling schematic diagram is touched in 3 and 4 first step of the embodiment of the present invention；
In figure：1st, electrode layer is encouraged, 2, piezoelectric material layer, 3, ground electrode layer, 4, insulating layer.
Embodiment
The preferred embodiment of the present invention is illustrated below in conjunction with attached drawing.It is it should be appreciated that described herein preferred real
Apply example to be merely to illustrate and explain the present invention, be not intended to limit the present invention.
Capacitance touch screen system of the embodiment 1 based on piezoelectric
The present embodiment includes front end touch Panel and the first back-end circuit；
With reference to Fig. 2, front end touch Panel includes excitation electrode layer 1, piezoelectric material layer 2 and the ground set gradually from top to bottom
Electrode layer 3 is formed；Piezoelectric material layer 2 is used as dielectric layer, the group together with the excitation electrode layer 1 and ground electrode layer 3 as electrode plate
Into capacitance detecting part；Piezoelectric material layer 2 is used as pressure detecting layer, the decomposition pressure together with excitation electrode layer 1 and ground electrode layer 3
Detection part；
With reference to Fig. 3, the first back-end circuit include the first reading circuit, signal processing circuit, the first data storage cell and
First control unit；Wherein, the first reading circuit includes charge amplifier/voltage amplifier, filter unit, the mould being sequentially connected in series
Number converting unit and data selector, filter unit include low-pass filter unit and bandpass filtering unit in parallel；Analog-to-digital conversion
Unit includes 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, with charge amplifier/electricity
The signal input part of pressure amplifier is 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 digital signal of the digital signal output end of first AD conversion unit and the second AD conversion unit is defeated
Outlet, is 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 terminal is connected；The storage signal output port of signal processing circuit and the storage signal input part of the first data storage cell
Mouth is connected, and the control signal input of the first data storage cell is connected with the inquiry signal output part of the first control unit, the
The signal output part of one data storage cell is connected with the historical signal input terminal of the first control unit.
In the present embodiment, front end touch Panel also exploit with structure as shown in Figure 4 come form capacitance detecting part and
Pressure detecting part, front end touch Panel includes piezoelectric material layer 2, the excitation electrode set gradually from top to bottom in this structure
Layer 1, insulating layer 4 and ground electrode layer 3, excitation electrode layer 1, insulating layer 4 and ground electrode layer 3 form capacitance detecting part, press together
Material layer 2 and excitation electrode layer 1 form pressure detecting part together.
In the present embodiment, the first control unit is realized using hardware configuration same as the prior art.
Capacitance touch screen system of the embodiment 2 based on piezoelectric
The present embodiment includes front end touch Panel and the second back-end circuit；
With reference to Fig. 4, piezoelectric material layer 2 that front end touch Panel includes setting gradually from top to bottom, excitation electrode layer 1, absolutely
Edge layer 4 and ground electrode layer 3；Excitation electrode layer 1, insulating layer 4 and ground electrode layer 3 form capacitance detecting part together；Piezoelectric
Layer 2 and excitation electrode layer 1 form pressure detecting part together；
With reference to Fig. 5, the second back-end circuit includes the second reading circuit, the second control unit and the second data storage cell；
Wherein, the 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, with charge amplifier/electricity
The signal input part of pressure amplifier is 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；
The signal output part of second data storage cell is connected with the historical signal input terminal of the second control unit, and the storage of the second data is single
The control signal input of member 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 low-pass filtering 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 also can using structure as shown in Figure 2 come form capacitance detecting part and
Pressure detecting part, front end touch Panel includes excitation electrode layer 1, the piezoelectric set gradually from top to bottom in this structure
Layer 2 and ground electrode layer 3, excitation electrode layer 1 and ground electrode of 2 one side of piezoelectric material layer as dielectric layer and as electrode plate
Layer 3 forms capacitance detecting part together, and another aspect piezoelectric material layer 2 is as pressure detecting layer and excitation electrode layer 1 and ground electricity
3 decomposition pressure detection part together of pole layer.
The method that processing pressure detects in the capacitance 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 half that capacitance detecting part detects
The relevant electric signal in footpath, the relevant electric signal of touch location, and the electric signal of pressure correlation that pressure detecting portion sorting measures；
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 according to the working process of step 2 as a result, from the pressure value ratio that itself is stored because
Corresponding pressure value proportionality factor is searched in number form and the working process result to step 2 is calculated, revised, is formed final
Pressure value；
The production method of above-mentioned pressure value proportionality factor form carries out successively according to following steps：
(1) with reference to Fig. 6, in the case where touch radius is identical, apply in the diverse location of front end touch Panel same big
Small dynamics, the magnitude of voltage obtained respectively in tracer signal process circuit are whole according to touch location numbering by the magnitude of voltage of record
Manage into a voltage value matrix；
The realization of this step includes the following steps carried out successively,
When (a) touch action occurs, charge amplifier/voltage amplifier collects excitation electrode layer 1, piezoelectric material layer 2
Hybrid analog-digital simulation voltage signal is zoomed into after the electric signal of upper generation, and result is exported to low-pass filter unit and bandpass filtering list
Member；
The processing of received hybrid analog-digital simulation voltage signal is simulated pressure signal by (b) low-pass filter unit, and is exported extremely
First AD conversion unit, bandpass filter for artificial capacitor signal and export the processing of received hybrid analog-digital simulation voltage signal extremely
Second AD conversion unit；
Received simulated pressure signal is converted into digital signal and exported to entering data by (c) the first AD conversion unit
Selector, meanwhile, received artificial capacitor signal is changed into digital signal and exported to data and selected by the second AD conversion unit
Select device；
(d) data selector exports the selection of received digital signal to signal processing circuit, by signal processing circuit
Handle magnitude of voltage and the relevant magnitude of voltage of corresponding touch location for pressure correlation, touch the relevant magnitude of voltage of radius；
(e) recording step (d) as a result, and corresponding numbering and being 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, after obtaining a series of normalizeds
Voltage value matrix；
(4) the voltage value matrix after a series of obtained normalizeds is made into form and is stored in the first data
In storage unit；
The form, that is, pressure value proportionality factor form；
Final pressure value is further processed in 4th step, the first control unit, exports corresponding control signal；
In this step, the first control unit judges the intention of user, Ran Houfa according to the final pressure value received
Go out control command and control corresponding unit response, this process is identical with the 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, the calculating in the 3rd step, revision are completed in signal processing circuit.
The method that processing pressure detects in the capacitance 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 half that capacitance detecting part detects
The relevant electric signal in footpath, the relevant electric signal of touch location, and the electric signal of pressure correlation that pressure detecting portion sorting measures；
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 according to the working process of step 2 as a result, from the pressure value ratio that itself is stored because
Corresponding pressure value proportionality factor is searched in number form and the working process result to step 2 is calculated, revised, is formed final
Pressure value；
The production method of above-mentioned pressure value proportionality factor form carries out successively according to following steps：
1. with reference to Fig. 6, in the case where touch radius is identical, apply in the diverse location of front end touch Panel onesize
Dynamics, the magnitude of voltage that record control unit obtains respectively, and according to touch location numbering be organized into a voltage value matrix；
This step includes the following steps carried out successively,
1. a, when touch action occurs, on charge amplifier/voltage amplifier collection excitation electrode layer 1, piezoelectric material layer 2
Analog voltage signal is zoomed into after the electric signal of generation and exports result to AD conversion unit；
1. b, received analog voltage signal is converted into digital signal and exports result to second by AD conversion unit
Control unit；1. c, the second control unit utilizes the low-pass filtering algorithm itself stored, is by received Digital Signal Processing
Pressure signal, meanwhile, received Digital Signal Processing is by the second control unit using the bandpass filtering algorithm itself stored
Capacitance signal, the pressure signal are exactly the electric signal of pressure correlation, and the capacitance signal is exactly the electricity with the pressure correlation
Press the relevant electric signal of the corresponding touch location of signal, touch the relevant electric signal of radius；
1. d, recording step 1. c's as a result, and corresponding numbering and being organized into a voltage value matrix；
2. by step 1. in obtained voltage value matrix do normalized；
3. touch radius is varied multiple times, repeat step 1. with step 2., obtain a series of voltage after normalizeds
Value matrix；
Deposited 4. making form and being stored in the second data the voltage value matrix after a series of obtained normalizeds
In storage unit；
The form, that is, pressure value proportionality factor form；
4th, final pressure value is further processed in the second control unit, exports corresponding control signal；
In this step, the second control unit judges the intention of user, Ran Houfa according to the final pressure value received
Go out control command and control corresponding unit response, this process is identical with the 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, the calculating in the 3rd step, revision are completed in the second control unit.
Finally it should be noted that：The foregoing is only a preferred embodiment of the present invention, is 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 modify to the technical solution 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 replacement, improvement and so on, should be included in power of the present invention
Within the scope of profit is claimed.
Claims (5)
- A kind of 1. method for the processing pressure detection realized in the capacitance touch screen system based on piezoelectric, using based on piezoresistive material The capacitance touch screen system of material realizes that the capacitance touch screen system based on piezoelectric includes front end touch Panel and rear end electricity Road, the front end touch Panel include capacitance detecting part and pressure detecting part；The capacitance detecting part and pressure detecting Partial signal output part is connected with the signal input part of back-end circuit；The front end touch Panel includes three layer signal acquisition layers or four layer signal acquisition layers；Wherein,One）Three layer signal acquisition layersThe three layer signals acquisition layer includes the excitation electrode layer set gradually from top to bottom（1）, piezoelectric material layer（2）With ground electricity Pole layer（3）,The piezoelectric material layer（2）As dielectric layer, with the excitation electrode layer as electrode plate（1）With ground electrode layer（3）Together Form capacitance detecting part；Piezoelectric material layer（2）As pressure detecting layer, with encouraging electrode layer（1）With ground electrode layer（3）Together Decomposition pressure detection part；Two）Four layer signal acquisition layersThe four layer signals acquisition layer includes the piezoelectric material layer set gradually from top to bottom（2）, excitation electrode layer（1）, insulation Layer（4）With ground electrode layer（3）,The excitation electrode layer（1）, insulating layer（4）With ground electrode layer（3）Capacitance detecting part is formed together；The piezoelectric material layer（2）With excitation electrode layer（1）Pressure detecting part is formed together；The back-end circuit is the first back-end circuit or the second back-end circuit, wherein,A）First back-end circuitFirst back-end circuit includes the first reading circuit, signal processing circuit, the first data storage cell and the first control unit； The signal input part of first reading circuit is connected with the signal output part of the capacitance detecting part, pressure detecting part, The signal output part of first reading circuit is connected with the signal input part of signal processing circuit, the storage signal of signal processing circuit Output port is connected with the storage signal input port of the first data storage cell, and the control signal of the first data storage cell is defeated Enter end with the inquiry signal output part of the first control unit to be connected, the signal output part of the first data storage cell and the first control The historical signal input terminal of unit is connected；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 low-pass filter unit in parallel and band logical filter Ripple unit；AD conversion unit includes the first AD conversion unit and the second AD conversion unit in parallel, the capacitance detecting Partial signal output part and the signal output part of pressure detecting part, it is defeated with the signal of charge amplifier/voltage amplifier Enter end to be connected；The signal input part of low-pass filter unit and the signal input part of bandpass filtering unit, with charge amplifier/electricity The signal output part of pressure amplifier is connected, the analog signal of the signal output part of low-pass filter unit and the first AD conversion unit Input terminal is connected, and the signal output part of bandpass filtering unit is connected with the input end of analog signal of the second AD conversion unit；The The digital signal output end of the digital signal output end of one AD conversion unit and the second AD conversion unit, selects with data The signal input part of device is connected, and the signal output part of data selector is connected with the signal input part of signal processing circuit；B) the second back-end circuitSecond back-end circuit includes the second reading circuit, the second control unit and the second data storage cell；Described second reads The signal input part of circuit is connected with the signal output part of the capacitance detecting part, pressure detecting part, the second reading circuit Signal output part be connected with the reading signal input part of the second control unit, the signal output part of the second data storage cell with The historical signal input terminal of second control unit is connected, and the control signal input of the second data storage cell and the second control are single The inquiry signal output part of member is connected；Second reading circuit includes the charge amplifier/voltage amplifier and modulus of series connection Converting unit, the signal output part of the capacitance detecting part and the signal output part of pressure detecting part, amplify with electric charge The signal input part of device/voltage amplifier is connected, the signal output part and AD conversion unit of charge amplifier/voltage amplifier Input end of analog signal be connected, the digital signal output end of AD conversion unit and the signal input part phase of the second control unit Even；In the method for the processing pressure detection that the capacitance touch screen system based on piezoelectric is realized, including the following step carried out successively Suddenly：First, when there is touch action generation, back-end circuit collects the relevant telecommunications of touch radius that capacitance detecting part detects Number, the relevant electric signal of touch location, and the electric signal of pressure correlation that pressure detecting portion sorting measures；2nd, back-end circuit is by be collected into three kinds of electric signal working processes；3rd, back-end circuit according to the working process of step 2 as a result, being searched from the pressure value proportionality factor form that itself is stored Corresponding pressure value proportionality factor simultaneously calculates the working process result of step 2, revision, forms final pressure value；4th, final pressure value is further processed in the control unit of the first control unit/second, exports corresponding control letter Number；The production method of the pressure value proportionality factor form carries out successively according to following steps：（One）In the case where touch radius is identical, apply an equal amount of dynamics 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；（Two）By step（One）In obtained voltage value matrix do normalized；（Three）Touch radius, repeat step is varied multiple times（One）And step（Two）, obtain a series of electricity after normalizeds Press value matrix；（Four）Voltage value matrix after a series of obtained normalizeds is made into form and is stored in the storage of the first data In the data storage cell of unit/second；The form, that is, pressure value proportionality factor form.
- 2. the side of the processing pressure detection according to claim 1 realized in the capacitance touch screen system based on piezoelectric Method, this method are realized using the first back-end circuit, it is characterised in that the step（One）Including the following steps carried out successively：When (a) touch action occurs, charge amplifier/voltage amplifier collects excitation 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 processing of received analog voltage signal is simulated pressure signal by (b) low-pass filter unit, and is exported to the first modulus Converting unit, bandpass filter for artificial capacitor signal and export the processing of received analog voltage signal to the second analog-to-digital conversion Unit；Received simulated pressure signal is converted into digital signal and exported to data to select by (c) the first AD conversion unit Device, meanwhile, received artificial capacitor signal is changed into digital signal and exported to data selector by the second AD conversion unit；(d) data selector to signal processing circuit, is handled the selection output of received digital signal by signal processing circuit Magnitude of voltage and the relevant magnitude of voltage of corresponding touch location, the touch relevant magnitude of voltage of radius for pressure correlation；(e) recording step (d) as a result, and corresponding numbering and being organized into a voltage value matrix.
- 3. the side of the processing pressure detection according to claim 1 realized in the capacitance touch screen system based on piezoelectric Method, this method are realized using the second back-end circuit, it is characterised in that the step（One）Including the following steps carried out successively：1. a, when touch action occurs, charge amplifier/voltage amplifier collects excitation electrode layer（1）, piezoelectric material layer（2）On Analog voltage signal is zoomed into after the electric signal of generation and exports result to AD conversion unit；1. b, received analog voltage signal is converted into digital signal and exports result to the second control by AD conversion unit Unit；1. c, the second control unit utilizes the low-pass filtering algorithm itself stored, and received Digital Signal Processing is believed for pressure Number, meanwhile, the second control unit utilizes the bandpass filtering algorithm itself stored to believe received Digital Signal Processing for capacitance 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 relevant electric signal of corresponding touch location, touch the relevant electric signal of radius；1. d, recording step 1. c's as a result, and corresponding numbering and being organized into a voltage value matrix.
- 4. the side of the processing pressure detection according to claim 1 realized in the capacitance touch screen system based on piezoelectric Method, it is characterised in that：Calculated described in step 3, revise and completed in signal processing circuit.
- 5. the side of the processing pressure detection according to claim 1 realized in the capacitance touch screen system based on piezoelectric Method, it is characterised in that：Calculated described in step 3, revise and completed in the second control unit.
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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 |
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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 |
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