CN107272948A - Electric capacity touch screen system and corresponding pressure detection method based on piezoelectric - Google Patents
Electric capacity touch screen system and corresponding pressure detection method based on piezoelectric Download PDFInfo
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- CN107272948A CN107272948A CN201710438469.7A CN201710438469A CN107272948A CN 107272948 A CN107272948 A CN 107272948A CN 201710438469 A CN201710438469 A CN 201710438469A CN 107272948 A CN107272948 A CN 107272948A
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- 238000001514 detection method Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 claims abstract description 31
- 238000006243 chemical reaction Methods 0.000 claims description 51
- 238000001914 filtration Methods 0.000 claims description 41
- 230000005284 excitation Effects 0.000 claims description 34
- 230000008569 process Effects 0.000 claims description 13
- 230000009471 action Effects 0.000 claims description 6
- 238000004148 unit process Methods 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/14—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators
- G01L1/142—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators using capacitors
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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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- 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
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
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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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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Power Engineering (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Electronic Switches (AREA)
- Position Input By Displaying (AREA)
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 the capacitance detecting part and pressure detecting part that three layers or four layer signal acquisition layers are constituted；Back-end circuit includes reading circuit and signal processing circuit.The invention also discloses the pressure detection method realized using above-mentioned electric capacity touch screen system.The present invention does not increase system complexity while pressure detecting susceptibility is improved, and the method used is succinct, it is easy to accomplish.The present invention electric capacity touch screen system suitable for improving pressure detecting susceptibility.
Description
Technical Field
The invention belongs to the technical field of electronic equipment, and relates to a capacitive touch screen system based on a piezoelectric material and a corresponding pressure detection method.
Background
Pressure detection has become a new function of touch screen electronic products, and existing touch screen pressure detection cannot provide enough pressure detection sensitivity based on capacitance change generated by pressure detection, and also increases thickness and complexity of a touch screen and energy consumption of products.
No matter the pressure detection sensitivity is poor, the complexity of the touch screen structure is increased, and the energy consumption is increased, the user experience of the touch screen electronic product is reduced, and the market competitiveness is reduced.
Therefore, there is a need for a new technique that can ensure a highly sensitive pressure detection function without increasing the complexity of the system.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention aims to provide a capacitive touch screen system based on piezoelectric materials;
another object of the present invention is to provide a pressure detection method implemented by using the piezoelectric material-based capacitive touch screen system.
In order to achieve the purpose, the invention adopts the following technical scheme:
a capacitive touch screen system based on piezoelectric materials comprises a front-end touch screen panel and a back-end circuit;
touch panel of front end
The front-end touch screen panel comprises three signal acquisition layers or four signal acquisition layers; wherein,
1) three-layer signal acquisition layer
The three signal acquisition layers comprise an excitation electrode layer, a piezoelectric material layer and a ground electrode layer which are sequentially arranged from top to bottom, the piezoelectric material layer is used as a dielectric layer and forms a capacitance detection part together with the excitation electrode layer and the ground electrode layer which are used as electrode plates, and the piezoelectric material layer is used as a pressure detection layer and forms a pressure detection part together with the excitation electrode layer and the ground electrode layer;
2) four-layer signal acquisition layer
The four signal acquisition layers comprise a piezoelectric material layer, an excitation electrode layer, an insulating layer and a ground electrode layer which are sequentially arranged from top to bottom, the excitation electrode layer, the insulating layer and the ground electrode layer form a capacitance detection part together, and the piezoelectric material layer and the excitation electrode layer form a pressure detection part together;
② back end circuit
The back-end circuit is one of a first back-end circuit or a second back-end circuit, wherein:
A. first back-end circuit
The first back-end circuit comprises a first reading circuit and a first signal processing circuit;
the first reading circuit comprises a charge amplifier/voltage amplifier, a filtering unit, an analog-to-digital conversion unit and a data selector which are sequentially connected in series, wherein the filtering unit comprises a low-pass filtering unit and a band-pass filtering unit which are connected in parallel, and the analog-to-digital conversion unit comprises a first analog-to-digital conversion unit and a second analog-to-digital conversion unit which are connected in parallel;
the signal output ends of the capacitance detection part and the pressure detection part are connected with the signal input end of the charge amplifier/voltage amplifier, the signal input ends of the low-pass filter unit and the band-pass filter unit are connected with the signal output end of the charge amplifier/voltage amplifier, the signal output ends of the low-pass filter unit and the band-pass filter unit are respectively connected with the analog signal input ends of the first analog-to-digital conversion unit and the second analog-to-digital conversion unit, the digital signal output ends of the first analog-to-digital conversion unit and the second analog-to-digital conversion unit are connected with the signal input end of the data selector, and the signal output end of the data selector is connected with the signal input end of the first signal;
B. second back end circuit
The second back-end circuit comprises a second reading circuit and a second signal processing circuit;
the second reading circuit comprises a charge amplifier/voltage amplifier and an analog-to-digital conversion unit which are connected in series;
the signal output ends of the capacitance detection part and the pressure detection part are connected with the signal input end of the charge amplifier/voltage amplifier, the signal output end of the charge amplifier/voltage amplifier is connected with the analog signal input end of the analog-to-digital conversion unit, and the digital signal output end of the analog-to-digital conversion unit is connected with the signal input end of the second signal processing circuit.
The invention also provides a pressure detection method implemented by using the piezoelectric material-based capacitive touch screen system, wherein the method is a first method when a first back-end circuit is adopted by the back-end circuit, and the method is a second method when a second back-end circuit is adopted by the back-end circuit, wherein,
I. method 1
The first method comprises the following steps of:
firstly, when a touch screen action occurs, a charge amplifier/voltage amplifier collects mixed electric signals generated on an excitation electrode layer and a piezoelectric material layer, amplifies the mixed electric signals into mixed analog voltage signals and outputs the mixed analog voltage signals to a low-pass filtering unit and a band-pass filtering unit;
secondly, the low-pass filtering unit processes the received mixed analog voltage signal to obtain an analog pressure signal and outputs the result to the first analog-to-digital conversion unit, and the band-pass filter processes the received mixed analog voltage signal to obtain an analog capacitance signal and outputs the result to the second analog-to-digital conversion unit;
thirdly, the first analog-to-digital conversion unit converts the received analog pressure signal into a digital signal and outputs the result to the data selector, and meanwhile, the second analog-to-digital conversion unit converts the received analog capacitance signal into a digital signal and outputs the result to the data selector;
fourthly, the data selector selectively outputs the received digital signals to the first signal processing circuit;
fifthly, the first signal processing circuit further judges and processes the received electric signals and outputs the electric signals to the control unit, and the control unit outputs corresponding control signals according to the received electric signals;
II. method II
The second method comprises the following steps of:
firstly, when a touch screen action occurs, a charge amplifier/voltage amplifier collects mixed electric signals generated on an excitation electrode layer and a piezoelectric material layer, amplifies the mixed electric signals into mixed analog voltage signals and outputs the mixed analog voltage signals to an analog-to-digital conversion unit;
secondly, the analog-to-digital conversion unit converts the received mixed analog voltage signal into a mixed digital signal and outputs the result to a second signal processing circuit;
thirdly, the second signal processing circuit processes the received mixed digital signal by utilizing a low-pass filtering algorithm stored by the second signal processing circuit to obtain a pressure signal and processes the received mixed digital signal by utilizing a band-pass filtering algorithm stored by the second signal processing circuit to obtain a capacitance signal;
and fourthly, the control unit outputs a corresponding control signal after further processing according to the processing result of the third step.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the technical progress that:
(1) the invention provides a capacitance touch screen system based on piezoelectric materials, which utilizes the characteristics of the piezoelectric materials to serve as a dielectric layer of a capacitance detection part on one hand and form a pressure detection part together with an excitation electrode layer on the other hand, thereby reducing the increase of energy consumption while not increasing the complexity of the system;
(2) the capacitance signal and the pressure signal are separated by the filtering unit, so that the pressure detection sensitivity is improved, and the system complexity is not increased;
(3) the method adopted by the invention is simple and easy to realize.
The method is suitable for improving the pressure detection sensitivity in the capacitive touch screen system.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
In the drawings:
fig. 1 is a schematic partial structure diagram of a front-end touch screen panel according to embodiments 1 and 2 of the present invention;
fig. 2 is a schematic partial structure view of a front touch screen panel according to embodiments 1 and 2 of the present invention;
FIG. 3 is an electrical schematic diagram of embodiment 1 of the present invention;
fig. 4 is an electrical schematic diagram of embodiment 2 of the present invention.
In the figure: 1. excitation electrode layer, 2, piezoelectric material layer, 3, ground electrode layer, 4, insulating layer.
Detailed Description
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for purposes of illustration and explanation only and are not intended to limit the present invention.
Embodiment 1 capacitive touch screen system based on piezoelectric material
A capacitive touch screen system based on piezoelectric materials comprises a front-end touch screen panel and a first back-end circuit.
Referring to fig. 1, the front-end touch screen panel includes three signal acquisition layers, where the three signal acquisition layers include an excitation electrode layer 1, a piezoelectric material layer 2, and a ground electrode layer 3, which are sequentially disposed from top to bottom; among them, the piezoelectric material layer 2 constitutes a capacitance detecting portion together with the excitation electrode layer 1 and the ground electrode layer 3 as electrode plates as a dielectric layer on the one hand, and the piezoelectric material layer 2 constitutes a pressure detecting portion together with the excitation electrode layer 1 and the ground electrode layer 3 as a pressure detecting layer on the other hand.
Referring to fig. 3, the first back-end circuit includes a first read circuit and a first signal processing circuit; the first reading circuit comprises a charge amplifier/voltage amplifier, a filtering unit, an analog-to-digital conversion unit and a data selector which are sequentially connected in series, wherein the filtering unit comprises a low-pass filtering unit and a band-pass filtering unit which are connected in parallel, and the analog-to-digital conversion unit comprises a first analog-to-digital conversion unit and a second analog-to-digital conversion unit which are connected in parallel;
the signal output ends of the capacitance detection part and the pressure detection part are connected with the signal input end of the charge amplifier/voltage amplifier, the signal input ends of the low-pass filtering unit and the band-pass filtering unit are connected with the signal output end of the charge amplifier/voltage amplifier, the signal output ends of the low-pass filtering unit and the band-pass filtering unit are respectively connected with the analog signal input ends of the first analog-to-digital conversion unit and the second analog-to-digital conversion unit, the digital signal output ends of the first analog-to-digital conversion unit and the second analog-to-digital conversion unit are connected with the signal input end of the data selector, and the signal output end of the data selector is connected with the signal input end of the first.
In this embodiment, another front-end touch panel including a four-layer signal acquisition layer structure may also be adopted, and referring to fig. 2, the four-layer signal acquisition layer includes a piezoelectric material layer 2, an excitation electrode layer 1, an insulating layer 4, and a ground electrode layer 3, which are sequentially disposed from top to bottom; wherein, the exciting electrode layer 1, the insulating layer 4 and the ground electrode layer 3 together constitute a capacitance detecting portion; the piezoelectric material layer 2 and the excitation electrode layer 1 together constitute a piezoelectric measuring portion.
In the present embodiment, the cut-off frequency of the low-pass filter in the low-pass filter unit is 10kHz, and the bandwidth of the band-pass filter is designed according to the capacitive excitation signal, for example, when the capacitive excitation signal is a sinusoidal signal of 100kHz, the band-pass filter is a butterworth band-pass filter centered at 100kHz, and the cut-off frequency is 90kHz and 110 kHz.
In this embodiment, the first signal processing circuit may have the same structure as that of the related art.
Embodiment 2 capacitive touch screen system based on piezoelectric material
A capacitive touch screen system based on piezoelectric materials comprises a front-end touch screen panel and a second back-end circuit.
Referring to fig. 1, the front-end touch screen panel includes three signal acquisition layers, where the three signal acquisition layers include an excitation electrode layer 1, a piezoelectric material layer 2, and a ground electrode layer 3, which are sequentially disposed from top to bottom; among them, the piezoelectric material layer 2 constitutes a capacitance detecting portion together with the excitation electrode layer 1 and the ground electrode layer 3 as electrode plates as a dielectric layer on the one hand, and the piezoelectric material layer 2 constitutes a pressure detecting portion together with the excitation electrode layer 1 and the ground electrode layer 3 as a pressure detecting layer on the other hand.
Referring to fig. 4, the second back-end circuit includes a second read circuit and a second signal processing circuit; the second reading circuit comprises a charge amplifier/voltage amplifier and an analog-to-digital conversion unit which are connected in series; the signal output ends of the capacitance detection part and the pressure detection part are connected with the signal input end of the charge amplifier/voltage amplifier, the signal output end of the charge amplifier/voltage amplifier is connected with the analog signal input end of the analog-to-digital conversion unit, and the digital signal output end of the analog-to-digital conversion unit is connected with the signal input end of the second signal processing circuit;
the second signal processing circuit comprises a control unit which stores a low-pass filtering algorithm and a band-pass filtering algorithm; the hardware structure of the control unit is the same as that of the prior art, and one part of the control unit, the low-pass filtering algorithm and the band-pass filtering algorithm form the low-pass filtering unit and the band-pass filtering unit.
In this embodiment, another front-end touch panel including a four-layer signal acquisition layer structure may also be adopted, and referring to fig. 2, the four-layer signal acquisition layer includes a piezoelectric material layer 2, an excitation electrode layer 1, an insulating layer 4, and a ground electrode layer 3, which are sequentially disposed from top to bottom; wherein, the exciting electrode layer 1, the insulating layer 4 and the ground electrode layer 3 together constitute a capacitance detecting portion; the piezoelectric material layer 2 and the excitation electrode layer 1 together constitute a piezoelectric measuring portion.
Embodiment 3 a pressure detection method implemented in a capacitive touch screen system based on piezoelectric materials
This embodiment is a pressure detection method implemented by embodiment 1, and includes the following steps performed in sequence:
firstly, when a touch screen action occurs, a charge amplifier/voltage amplifier collects mixed electric signals generated on an excitation electrode layer 1 and a piezoelectric material layer 2, amplifies the mixed electric signals into mixed analog voltage signals and outputs the mixed analog voltage signals to a low-pass filtering unit and a band-pass filtering unit;
secondly, the low-pass filtering unit processes the received mixed analog voltage signal to obtain an analog pressure signal and outputs the result to the first analog-to-digital conversion unit, and the band-pass filter processes the received mixed analog voltage signal to obtain an analog capacitance signal and outputs the result to the second analog-to-digital conversion unit;
thirdly, the first analog-to-digital conversion unit converts the received analog pressure signal into a digital signal and outputs the result to the data selector, and meanwhile, the second analog-to-digital conversion unit converts the received analog capacitance signal into a digital signal and outputs the result to the data selector;
fourthly, the data selector selectively outputs the received digital signals to the first signal processing circuit;
fifthly, the first signal processing circuit further judges and processes the received electric signals, then a control unit contained in the first signal processing circuit outputs corresponding control signals according to the further processing result, and the corresponding units respond after receiving the control signals;
in this step, the control unit may adopt an existing hardware structure, and the signal processing circuit and the control unit included therein may process the received electrical signal in the same manner as in the prior art.
Embodiment 4 a pressure detection method implemented in a capacitive touch screen system based on piezoelectric materials
This embodiment is implemented using embodiment 2, which comprises the following steps performed in sequence:
firstly, when a touch screen action occurs, a charge amplifier/voltage amplifier collects mixed electric signals generated on an excitation electrode layer and a piezoelectric material layer, amplifies the mixed electric signals into mixed analog voltage signals and outputs the mixed analog voltage signals to an analog-to-digital conversion unit;
secondly, the analog-to-digital conversion unit converts the received mixed analog voltage signal into a mixed digital signal and outputs the result to a second signal processing circuit;
thirdly, the second signal processing circuit processes the received mixed digital signal by utilizing a low-pass filtering algorithm stored by the second signal processing circuit to obtain a pressure signal and processes the received mixed digital signal by utilizing a band-pass filtering algorithm stored by the second signal processing circuit to obtain a capacitance signal;
fourthly, the control unit outputs a corresponding control signal after further processing according to the processing result of the third step;
in this step, the processing method of the control unit is the same as that of the prior art.
The control unit belongs to a part of the second signal processing circuit, and the control unit only needs to adopt a hardware structure the same as that of the prior art.
In the present embodiment, the cutoff frequency in the low-pass filtering algorithm is 10kHz, and the bandwidth of the band-pass filtering is designed according to the capacitive excitation signal, for example, when the capacitive excitation signal is a sinusoidal signal of 100kHz, the band-pass filtering algorithm sets the frequency band center at 100kHz, and the cutoff frequencies at 90kHz and 110 kHz.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (2)
1. The utility model provides a capacitive touch screen system based on piezoelectric material, it includes front end touch screen panel and back end circuit, its characterized in that:
touch panel of front end
The front-end touch screen panel comprises three signal acquisition layers or four signal acquisition layers; wherein,
1) three-layer signal acquisition layer
The three signal acquisition layers comprise an excitation electrode layer (1), a piezoelectric material layer (2) and a ground electrode layer (3) which are sequentially arranged from top to bottom, the piezoelectric material layer (2) is used as a dielectric layer and forms a capacitance detection part together with the excitation electrode layer (1) and the ground electrode layer (3) which are used as electrode plates, and the piezoelectric material layer (2) is used as a pressure detection layer and forms a pressure detection part together with the excitation electrode layer (1) and the ground electrode layer (3);
2) four-layer signal acquisition layer
The four signal acquisition layers comprise a piezoelectric material layer (2), an excitation electrode layer (1), an insulating layer (4) and a ground electrode layer (3) which are sequentially arranged from top to bottom, the excitation electrode layer (1), the insulating layer (4) and the ground electrode layer (3) form a capacitance detection part, and the piezoelectric material layer (2) and the excitation electrode layer (1) form a pressure detection part;
② back end circuit
The back-end circuit is one of a first back-end circuit or a second back-end circuit, wherein:
first back-end circuit
The first back-end circuit comprises a first reading circuit and a first signal processing circuit;
the first reading circuit comprises a charge amplifier/voltage amplifier, a filtering unit, an analog-to-digital conversion unit and a data selector which are sequentially connected in series, wherein the filtering unit comprises a low-pass filtering unit and a band-pass filtering unit which are connected in parallel, and the analog-to-digital conversion unit comprises a first analog-to-digital conversion unit and a second analog-to-digital conversion unit which are connected in parallel;
the signal output ends of the capacitance detection part and the pressure detection part are connected with the signal input end of the charge amplifier/voltage amplifier, the signal input ends of the low-pass filter unit and the band-pass filter unit are connected with the signal output end of the charge amplifier/voltage amplifier, the signal output ends of the low-pass filter unit and the band-pass filter unit are respectively connected with the analog signal input ends of the first analog-to-digital conversion unit and the second analog-to-digital conversion unit, the digital signal output ends of the first analog-to-digital conversion unit and the second analog-to-digital conversion unit are connected with the signal input end of the data selector, and the signal output end of the data selector is connected with the signal input end of the first signal;
second back end circuit
The second back-end circuit comprises a second reading circuit and a second signal processing circuit;
the second reading circuit comprises a charge amplifier/voltage amplifier and an analog-to-digital conversion unit which are connected in series;
the signal output ends of the capacitance detection part and the pressure detection part are connected with the signal input end of the charge amplifier/voltage amplifier, the signal output end of the charge amplifier/voltage amplifier is connected with the analog signal input end of the analog-to-digital conversion unit, and the digital signal output end of the analog-to-digital conversion unit is connected with the signal input end of the second signal processing circuit.
2. A pressure detection method is characterized in that: this is achieved with the piezoelectric material based capacitive touch screen system of claim 1, which is method one when the back-end circuit employs a first back-end circuit, and method two when the back-end circuit employs a second back-end circuit, wherein,
I. method 1
The first method comprises the following steps of:
firstly, when a touch screen action occurs, a charge amplifier/voltage amplifier collects mixed electric signals generated on an excitation electrode layer (1) and a piezoelectric material layer (2) and amplifies the mixed electric signals into mixed analog voltage signals, and the results are output to a low-pass filtering unit and a band-pass filtering unit;
secondly, the low-pass filtering unit processes the received mixed analog voltage signal to obtain an analog pressure signal and outputs the result to the first analog-to-digital conversion unit, and the band-pass filter processes the received mixed analog voltage signal to obtain an analog capacitance signal and outputs the result to the second analog-to-digital conversion unit;
thirdly, the first analog-to-digital conversion unit converts the received analog pressure signal into a digital signal and outputs the result to the data selector, and meanwhile, the second analog-to-digital conversion unit converts the received analog capacitance signal into a digital signal and outputs the result to the data selector;
fourthly, the data selector selectively outputs the received digital signals to the first signal processing circuit;
fifthly, the first signal processing circuit further judges and processes the received electric signals and outputs the electric signals to the control unit, and the control unit outputs corresponding control signals according to the received electric signals;
II. method II
The second method comprises the following steps of:
firstly, when a touch screen action occurs, a charge amplifier/voltage amplifier collects mixed electric signals generated on an excitation electrode layer (1) and a piezoelectric material layer (2) and amplifies the mixed electric signals into mixed analog voltage signals, and the result is output to an analog-to-digital conversion unit;
secondly, the analog-to-digital conversion unit converts the received mixed analog voltage signal into a mixed digital signal and outputs the result to a second signal processing circuit;
thirdly, the second signal processing circuit processes the received mixed digital signal by utilizing a low-pass filtering algorithm stored by the second signal processing circuit to obtain a pressure signal and processes the received mixed digital signal by utilizing a band-pass filtering algorithm stored by the second signal processing circuit to obtain a capacitance signal;
and fourthly, the control unit outputs a corresponding control signal after further processing according to the processing result of the third step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710438469.7A CN107272948A (en) | 2017-06-12 | 2017-06-12 | Electric capacity touch screen system and corresponding pressure detection method based on piezoelectric |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710438469.7A CN107272948A (en) | 2017-06-12 | 2017-06-12 | Electric capacity touch screen system and corresponding pressure detection method based on piezoelectric |
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| CN201710438469.7A Pending CN107272948A (en) | 2017-06-12 | 2017-06-12 | Electric capacity touch screen system and corresponding pressure detection method based on piezoelectric |
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Application publication date: 20171020 |