CN106980411A - Induction installation and driving method - Google Patents
Induction installation and driving method Download PDFInfo
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- CN106980411A CN106980411A CN201710296085.6A CN201710296085A CN106980411A CN 106980411 A CN106980411 A CN 106980411A CN 201710296085 A CN201710296085 A CN 201710296085A CN 106980411 A CN106980411 A CN 106980411A
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- 230000006698 induction Effects 0.000 title claims abstract description 87
- 238000009434 installation Methods 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000001514 detection method Methods 0.000 claims abstract description 49
- 108010076504 Protein Sorting Signals Proteins 0.000 claims abstract description 23
- 238000001914 filtration Methods 0.000 claims abstract description 23
- 230000001186 cumulative effect Effects 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims abstract description 14
- 230000008859 change Effects 0.000 claims abstract description 10
- 238000004891 communication Methods 0.000 claims abstract description 7
- 230000001360 synchronised effect Effects 0.000 claims abstract description 5
- 238000004364 calculation method Methods 0.000 claims abstract description 3
- 239000003990 capacitor Substances 0.000 claims description 16
- 238000005070 sampling Methods 0.000 claims description 16
- 238000003780 insertion Methods 0.000 claims description 12
- 230000037431 insertion Effects 0.000 claims description 12
- 238000001228 spectrum Methods 0.000 claims description 7
- 230000005611 electricity Effects 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000002955 isolation Methods 0.000 description 5
- 230000003595 spectral effect Effects 0.000 description 5
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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
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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
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
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- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The invention discloses induction installation and driving method, it is possible to increase signal to noise ratio and antijamming capability.The induction installation includes：Sequence generator, for providing drive signal and offseting signal；Multiple driving electrodes and multiple sensing electrodes for forming multiple inductance capacitances；Front-end detection module, for the capacitance or capacitance change of multiple inductance capacitances to be converted into multiple first induced signals respectively；Computing module, for carrying out calculation process to multiple first induced signals to obtain multiple second induced signals respectively according to offseting signal；Cumulative filtration module, the 3rd induced signal is obtained for multiple second induced signals to be carried out with cumulative post filtering；And communication module, 3rd induced signal is converted to the data-signal for meeting specified data format, wherein, offseting signal is synchronous with drive signal and each sequence code for being rendered as respectively in one-dimensional sequence, drive signal sequence with the time with the product of corresponding sequence code in the offseting signal sequence is 1.
Description
Technical field
The present invention relates to electronic technology field, more particularly, to induction installation and driving method.
Background technology
It is widely used in using the induction technology of electric capacity in the induction installations such as touch-screen and fingerprint Identification sensor, it is main
If knowing testee by detecting the capacitance size of the electric capacity in various induction installations or the variable quantity of capacitance
The information such as position, shape or pressure.By taking capacitance type fingerprint identification sensor as an example, when finger touches induction installation surface
When, electric capacity can be formed with the electrode being located in induction installation below the touch-surface of induction installation, so as to directly or indirectly change
The capacitance size for becoming electric capacity in induction installation (in some induction installations, make use of self-capacitance technology, and sense at other
In device, mutual capacitance technology is used).Circuit in induction installation is to the capacitance of the electric capacity or the variable quantity of capacitance
Detected and obtained the data-signal of electrical signal form so that subsequent conditioning circuit can carry out further according to the data-signal
Data processing.
When capacitive induction installation is used for the fields such as Man Machine Interface, if human body and induction installation be not good
Commonly, then can be because do not introduce the interference signals such as common-mode noise altogether when human contact's induction installation.This feelings
Condition system where induction installation is connected constantly even more serious with charger because charger in itself can system power supply
With interference signal is introduced in reference ground.From spectral characteristic, the usual narrower interference signal meeting severe jamming of these bandwidth is arrived
Detection of the induction installation to electric capacity, and can reduce the signal to noise ratio of induction installation, or even make whole induction system normal
Work.
The content of the invention
In order to solve the problem of above-mentioned prior art is present, the present invention provides a kind of induction installation and driving method, can
Improve signal to noise ratio and antijamming capability, it is ensured that the normal work of induction installation.
There is provided a kind of induction installation according to an aspect of the present invention, it is characterised in that including：Sequence generator, is used for
Drive signal and offseting signal are provided；Multiple driving electrodes and multiple sensings electricity below the induction installation touch-surface
Pole, the multiple driving electrodes form multiple inductance capacitances with the multiple sensing electrode, and the multiple driving electrodes receive institute
State drive signal；Front-end detection module, is connected with the multiple sensing electrode, for respectively by the electricity of the multiple inductance capacitance
Capacity or capacitance change are converted into multiple first induced signals of electrical signal form；Computing module, for being offset according to described
Signal carries out calculation process to obtain multiple second induced signals to the multiple first induced signal respectively；Cumulative filtering mould
Block, the 3rd induced signal is obtained for carrying out cumulative post filtering to the multiple second induced signal；And communication module, by institute
State the 3rd induced signal and be converted to the data-signal output for meeting specified data format, wherein, the offseting signal drives with described
Dynamic signal is synchronous and is rendered as each sequence code in one-dimensional sequence, the drive signal sequence and the counteracting respectively with the time
The product of corresponding sequence code is 1 in signal sequence.
Preferably, the drive signal sequence includes pseudo-random code sequence or the sequence with class white noise spectrum characteristic.
Preferably, the front-end detection module includes multiple detection units, the input of the multiple detection unit and institute
State multiple sensing electrode correspondences to be connected, the output end of each detection unit provides first induced signal.
Preferably, each detection unit includes：Operational amplifier, with first input end, the second input and defeated
Go out end, the first input end receives reference voltage, and second input is connected with corresponding sensing electrode；Integrating capacitor,
The second input and the output end phase of the operational amplifier of the two ends of the integrating capacitor respectively with the operational amplifier
Connect to provide corresponding first induced signal；Reset switch, in parallel with the integrating capacitor, the reset switch is controlled by
Reset signal.
Preferably, the first input end of the operational amplifier is normal phase input end, and the second of the operational amplifier is defeated
It is inverting input to enter end.
Preferably, the computing module include multiple arithmetic elements, the input of the multiple arithmetic element with it is described many
The output end correspondence of individual detection unit is connected, and the output end of each arithmetic element provides second induced signal.
Preferably, each arithmetic element includes：Sampling switch, under the control of sampled signal to described first
Induced signal is sampled；Mlultiplying circuit, for the sampled result of the sampling switch and the offseting signal to be multiplied to
To second induced signal.
According to another aspect of the present invention, a kind of driving method for induction installation, the induction installation are additionally provided
Including the multiple driving electrodes and multiple sensing electrodes below the touch-surface of the induction installation, the multiple driving electricity
Pole forms multiple inductance capacitances with the multiple sensing electrode, wherein, the driving method includes：Produce drive signal and counteracting
Signal, the offseting signal is synchronous with the drive signal and is rendered as one-dimensional sequence, the drive signal sequence respectively with the time
Each sequence code in row is 1 with the product of corresponding sequence code in the offseting signal sequence；The drive signal is applied
In the multiple driving electrodes；The quantity of electric charge detected in the multiple sensing electrode is separately converted to electrical signal form
Multiple first induced signals；The multiple first induced signal is multiplied with the offseting signal respectively, to obtain multiple
Two induced signals；Cumulative post filtering is carried out to the multiple second induced signal and obtains the 3rd induced signal；And by described
Three induced signals are converted to the data-signal for meeting specified data format.
Preferably, the drive signal has high level and low level two states, the phase in the drive signal sequence
The state insertion code opposite with the state of two sequence codes is added between adjacent and state identical sequence code.
Preferably, the drive signal has high level, three kinds of states of low level and reset level, in the driving letter
Each sequence code of number sequence returns to the drive signal before starting the state of the reset level.
The beneficial effects of the invention are as follows the drive signal and offseting signal suppression common mode that can be generated using sequence generator
The interference signals such as noise, so as to improve the signal to noise ratio and anti-interference energy of induction installation on the premise of useful data is not influenceed
Power, while also achieving to the isolation between each sequence code in drive signal sequence to ensure the accuracy of induction installation.
Brief description of the drawings
By description referring to the drawings to the embodiment of the present invention, above-mentioned and other purposes of the invention, feature and
Advantage will be apparent from.
Fig. 1 shows the basic principle schematic of the induction installation of first embodiment of the invention.
Fig. 2 shows the section enlarged diagram of a-quadrant in Fig. 1.
Fig. 3 shows the structural representation of the induction installation of first embodiment of the invention.
Fig. 4 shows the connection of channel, front-end detection module and computing module in the induction installation of first embodiment of the invention
Schematic diagram.
Fig. 5 shows to correspond to the detection unit and fortune of same inductance capacitance in the induction installation of first embodiment of the invention
Calculate the structural representation of unit.
Fig. 6 shows the waveform signal of the drive signal that sequence generator is produced in the induction installation of first embodiment of the invention
Figure.
Fig. 7 shows another ripple of the drive signal that sequence generator is produced in the induction installation of first embodiment of the invention
Shape schematic diagram.
Fig. 8 shows the schematic flow sheet of the driving method for induction installation of second embodiment of the invention.
Embodiment
The present invention is more fully described hereinafter with reference to accompanying drawing.In various figures, identical element is using similar attached
Icon is remembered to represent.For the sake of clarity, the various pieces in accompanying drawing are not necessarily to scale.In addition, may not show in figure
Go out some known parts.
Many specific details of the present invention are describe hereinafter to be more clearly understood that the present invention.But as ability
The technical staff in domain it will be appreciated that as, the present invention can not be realized according to these specific details.
Fig. 1 shows the basic principle schematic of the induction installation of first embodiment of the invention.Fig. 2 shows a-quadrant in Fig. 1
Section enlarged diagram.
As depicted in figs. 1 and 2, induction installation 100, which has, has multiple electrodes below touch-surface, touch-surface.
Induction installation 100 can be self-capacitance structure, mutual capacitance structure or other capacitance structures.Either using which kind of electricity
Hold structure to realize, the operation principle of induction installation 100 is mainly：Apply drive signal to induction electrode to accumulate electricity on electrode
Lotus, by changing drive signal so that the electric charge on electrode is shifted, i.e., is allocated, so as to cause induction installation 100 again
The middle change for voltage, electric current, frequency or other information occur includes the electric signal of the information such as fingerprint, touch to obtain.Example
Such as, when induction installation 100 is self-capacitance structure, drive signal is acted on each electrode, so as to accumulate on each electrode
Electric charge；When induction installation 100 is mutual capacitance structure, electrode is divided into driving electrodes 101 and sensing electrode 102 as shown in Figure 2,
Drive signal is applied in each driving electrodes, so that the stored charge in each driving electrodes and each sensing electrode.Wherein,
Drive signal is one or more different signal.
It is specifically described below by taking the induction installation 100 for the mutual capacitance structure realized using single drive signal as an example.
The induction installation 100 for the mutual capacitance structure realized using single drive signal can be used for fingerprint recognition, its principle
It is：The fingerprint of finger 200 has fingerprint ridge 210 and fingerprint valley 220, and fingerprint valley 220 is shallower due to skin dead skin tissue accumulation, because
There is air in the touch-surface of this and induction installation 100；And the skin dead skin tissue of fingerprint ridge 210 relative to fingerprint valley to external
Projection, is contacted so as to the touch-surface directly with induction installation 100.It follows that fingerprint valley 220 and corresponding driving electricity
Pole 101 and sensing electrode 102 form electric capacity Cv1 and Cv2 respectively, so as to have influence on corresponding driving electrodes 101 and sensing electrode
Inductance capacitance Cx between 102；Fingerprint ridge 210 forms electric capacity Cp1 respectively with corresponding driving electrodes 101 and sensing electrode 102
And Cp2, so as to have influence on the inductance capacitance Cx between corresponding driving electrodes 101 and sensing electrode 102.Due to fingerprint valley 220
The capacitance of the electric capacity formed between fingerprint ridge 210 and corresponding driving electrodes 101 or sensing electrode 102 has differences, because
This, the inductance capacitance Cx corresponding with fingerprint ridge 210 of fingerprint valley 220 capacitance is differed.Therefore induction installation 100 passes through detection
The variable quantity of inductance capacitance Cx capacitance or capacitance can know position of fingerprint valley 220 and fingerprint ridge 210 etc. everywhere
Information is to realize the identification of fingerprint recognition or touch.
Fig. 3 shows the structural representation of the induction installation of first embodiment of the invention.
As shown in figure 3, first embodiment of the invention induction installation 100 mainly include sequence generator 110, channel 120,
Front-end detection module 130, computing module 140, cumulative filtration module 150 and communication module 160.In certain embodiments, feel
Device 100 is answered for example with either simplex transmission and spread of spectrum technologies (Spread Spectrum, SS)；In further embodiments,
Induction installation 100 also makees accommodation with the system applied to duplex transmission.
Sequence generator 110 is used to generate all driving electrodes 101 (as shown in Figure 2) for being applied to induction installation 100
Drive signal Ap and offseting signal An.Drive signal Ap is the pseudo noise code (Pseudorandom with certain length
Noise, PN) one-dimensional sequence or the one-dimensional sequence with the spectral characteristic similar with pseudo noise code, the frequency with class white noise
Spectral property.Offseting signal An is the sequence in one-dimensional sequence, offseting signal An sequence code and corresponding drive signal Ap
The product of code is equal to 1.
The inductance capacitance structure formed in induction installation 100 by driving electrodes 101 and sensing electrode 102 (as shown in Figure 2)
Into channel 120.In the presence of drive signal Ap, touching caused inductance capacitance Cx capacitance Csense change will draw
Play change of the accumulation in inductance capacitance Cx quantity of electric charge Qsense.
Front-end detection module 130 is connected with each sensing electrode 102 respectively, for by the capacitance Csense of inductance capacitance
Change be converted into the first induced signal S1 of the electrical signal form that can be recognized by computing module 140.
Channel 120 is multiplied obtained result etc. with the gain ga that front-end detection module 130 is produced jointly with drive signal Ap
The capacitance of the corresponding inductance capacitance of front-end detection module 130 is can be expressed as in the first induced signal S1, wherein gain ga
Csense and the constant B related to circuit parameter product, i.e.,：
S1=gaAp=CsenseBAp
Each the first induced signal S1 that computing module 140 exports front-end detection module 130 and offseting signal An sequence
Row are multiplied, and respectively obtain corresponding second induced signal S2, the second induced signal S2 expression formula is：
S2=S1An=gaApAn=CsenseB
As can be seen from the above equation, the capacitance Csense linear correlations of the second induced signal S2 and inductance capacitance, i.e., second
Induced signal S2 can characterize the capacitance Csense of inductance capacitance size.150 pair of second induced signal of cumulative filtration module
S2 carries out cumulative filtering and obtains the 3rd induced signal S3, and the 3rd induced signal S3 is further converted to data by communication module 160
Signal Ds simultaneously exports (for example to enter the 3rd induced signal S3 row format conversion, meet the communication interface specified to obtain having
The data-signal Ds of data format, the communication interface specified is, for example, Serial Peripheral Interface (SPI) (Serial Peripheral
Interface, SPI) or IC bus interface (Inter-Integrated Circuit, IIC) etc.), so that subsequently
Circuit can obtain touch information or finger print information that inductance capacitance is sensed from data-signal Ds.Generally, add up filtering mould
Block 150 is mainly used in filtering out the high-frequency noise in the second induced signal S2.In certain embodiments, add up filtration module 150 by
Digital circuit, such as when computing module 140 is exported using serial or parallel, the filtration module 150 that adds up is then using corresponding
Serial or parallel accumulator and digital filter realize, digital filter is, for example, recursive type digital filter
(Infinite Impulse Response, IIR), non-recursive type digital filter (Finite Impulse Response,
) and Butterworth digital filter etc. FIR.Certainly, in further embodiments, the filtration module 150 that adds up can also be used
Analog filtering technology.
In some cases, for example when induction installation 100 is connected with charger, common mode can be introduced in induction installation 100
The interference signal such as noise Nc.Interference signal Nc can be superimposed on the drive signal Ap of the offer of sequence generator 110 and via sensing
Electric capacity Cx enters front-end detection module 130 so that the first induced signal S1 expression formula is changed into：
S1=ga (Ap+Nc)=CsenseB (Ap+Nc)
Further, due to the interference signal such as common-mode noise Nc introducing, the first induced signal S1 and offseting signal An's
Sequence obtained the second induced signal S2 expression formula that is multiplied is：
S2=S1An=ga (Ap+Nc) An=CsenseB (1+NcAn)
Therefore the noise component(s) S2n=CsenseBNcAn brought in the second induced signal S2 by interference signal Nc.
Analyzed from frequency domain, because the drive signal Ap that sequence generator 110 is generated has the spectral characteristic of class white noise,
Drive signal Ap Energy distribution is in relatively wide frequency band.Due to the sequence code in offseting signal An and corresponding driving letter
The product of sequence code in number Ap is equal to 1, therefore offseting signal An equally has the spectral characteristic of class white noise, i.e. offseting signal
An energy is also distributed about relatively wide frequency band.And the interference signal Nc for being introduced to induction installation 100 by devices such as chargers leads to
Narrow-band noise often is shown as, i.e. the energy of interference signal Nc concentrates on a narrow frequency band.In the second induced signal S2
In the noise component(s) S2n brought by interference signal Nc expression formula, interference signal Nc and offseting signal An makees multiplying, quite
It is modulated in the wider offseting signal An of the frequency band interference signal Ncs narrower to frequency band, i.e. offseting signal An and interference signal
Nc carries out convolution algorithm on frequency domain, therefore interference signal Nc frequency spectrum is stretched in offseting signal An frequency band, that is, is disturbed
Signal Nc energy is disperseed.Then, the 150 couple of second induced signal S2 of filtration module that add up, which is filtered, obtains the 3rd sensing letter
Number S3, the 3rd induced signal S3 frequency band are located in the bandwidth of cumulative filtration module 150, and the second induced signal S2 is located at cumulative filter
Energy outside the bandwidth of ripple module 150 is filtered out.Because interference signal Nc frequency spectrum is stretched to offseting signal An frequency band,
In 3rd induced signal S3 by the interference signal Nc noise energies being introduced into be only the second induced signal S2 in interference signal Nc introduce
Noise energy a part, i.e. suppressed by the interference signal Nc noise energies introduced in the 3rd induced signal S3, from
And realize the lifting of system signal noise ratio.
Fig. 4 shows the connection of channel, front-end detection module and computing module in the induction installation of first embodiment of the invention
Schematic diagram.
As shown in figure 4, channel 120 is made up of multiple inductance capacitance Cx in induction installation 100, front-end detection module 130
Including multiple detection units 131 corresponding with multiple inductance capacitance Cx respectively, computing module 140 include respectively with front-end detection mould
The corresponding arithmetic element 141 of multiple detection units 131 in block 130.One end of each inductance capacitance Cx in induction installation 100
Drive signal Ap is received, other end detection unit 131 corresponding with front-end detection module is connected so that the detection unit 131
First induced signal S1, then, the computing being connected with the output end of the detection unit 131 are obtained according to corresponding inductance capacitance Cx
141 couple of first induced signal S1 of unit and offseting signal An carries out multiplying and obtains the second induced signal S2.
Below with corresponding with inductance capacitance Cx in an inductance capacitance Cx in induction installation 100, front-end detection module
Detection unit and computing module in illustrate exemplified by arithmetic element corresponding with the inductance capacitance.
Fig. 5 shows to correspond to the detection unit and fortune of same inductance capacitance in the induction installation of first embodiment of the invention
Calculate the structural representation of unit.
As shown in figure 5, one end of an inductance capacitance Cx in induction installation 100 receives drive signal Ap, the other end with
The input of detection unit 131 corresponding with inductance capacitance Cx is connected in leading portion detection module, the output of the detection unit 131
The input of end arithmetic element 141 corresponding with computing module 140 is connected.
Detection unit 131 includes operational amplifier OP, integrating capacitor Cf and the reset switch for being controlled by reset signal rst
K1.Arithmetic element 141 includes being controlled by sampled signal sh sampling switch K2 and mlultiplying circuit MU.
Operational amplifier OP first input end receives reference voltage Vcm, one end of the second input and inductance capacitance Cx
It is connected.Integrating capacitor Cf is connected between operational amplifier OP output end and the second input, is controlled by answering for reset signal rst
Bit switch K1 is in parallel with integrating capacitor Cf.Operational amplifier OP output end provides the first induced signal S1.Operational amplifier 131
First input end be, for example, normal phase input end, the second input for example, inverting input.
The course of work of induction installation 100 is divided into two stages：Sample phase and integration phase.In sample phase, sequence
The drive signal Ap that maker 110 is provided charges to inductance capacitance Cx, makes inductance capacitance Cx stored charges, due to touch objects (example
Such as finger tip, touch-control nib) inductance capacitance Cx capacitance Csense can be made to change, therefore inductance capacitance Cx believes in driving
Touch information or finger print information can be characterized by accumulating obtained quantity of electric charge Qsense in the presence of number Ap.Start in integration phase
When, reset signal rst controls reset switch K1 to be changed into shut-off from turning on so that the quantity of electric charge Qsense accumulated in inductance capacitance Cx
Start to be transferred in integrating capacitor Cf, so that quantity of electric charge Qsense of the voltage at integrating capacitor Cf two ends according to inductance capacitance Cx
And change.It is empty short according to operational amplifier because the first input end of operational amplifier 131 receives reference voltage Vcm
Characteristic, the integrating capacitor Cf other end be operational amplifier 131 the first induced signal S1 voltage that is exported of output end with
Inductance capacitance Cx quantity of electric charge Qsense changes.Inductance capacitance Cx quantity of electric charge Qsense and the capacitance of inductance capacitance
Csense linear correlations, therefore output end the first induced signal S1 voltage and induced electricity that are exported of operational amplifier 131
The capacitance Csense linear correlations of appearance, so that the first induced signal S1 can characterize inductance capacitance Cx capacitance Csense,
Realize the detection of inductance capacitance.
Mlultiplying circuit MU in arithmetic element 141 is by sampling switch K2 to corresponding detection in front-end detection module 130
The first induced signal S1 that the output end of unit 131 is provided is sampled, and sampled result is provided with sequence generator 110
Offseting signal An be multiplied to obtain the second sampled signal S2.
Can also (m is less than inspection only comprising 1 or m arithmetic element 141 to save circuit area, in computing module 140
The natural number of element number is surveyed, m is, for example, the factor of the quantity of detection unit 141, i.e., the quantity of detection unit 131 is arithmetic element
The integral multiple of 141 quantity), successively or group by group by each sampling switch K2 by multiple first induced signals by way of scanning
S1 is converted to multiple second sampled signal S2.
Fig. 6 shows the waveform signal of the drive signal that sequence generator is produced in the induction installation of first embodiment of the invention
Figure.
As shown in fig. 6, drive signal Ap have respectively with high level voltage Vh, low level voltage Vl and resetting voltage Vr
Corresponding three kinds of level states, wherein, magnitude of voltage Vh>Vr>Vl.(have with drive signal Ap as shown in Figure 6 sequence below
Pseudo-random code sequence characteristic) for exemplified by [+1 ,+1, -1, -1].Each sequence code in drive signal Ap sequence corresponds to one respectively
Individual data cycle T 1, each 1 point of data cycle T is reseting stage tr and data are kept for stage th.In reseting stage tr, driving
Signal Ap magnitude of voltage is equal to resetting voltage Vr；Keep in stage th, when drive signal Ap sequence code is+1, drive in data
Dynamic signal Ap magnitude of voltage is high level voltage Vh, when drive signal Ap sequence code is -1, drive signal Ap magnitude of voltage
For low level voltage Vl.So that each sequence code in drive signal Ap can make drive signal Ap voltage after being transmitted
Value revert to resetting voltage Vr to carry out the transmission of next sequence code.
Fig. 7 shows another ripple of the drive signal that sequence generator is produced in the induction installation of first embodiment of the invention
Shape schematic diagram.
As shown in fig. 7, as another embodiment of drive signal of the present invention, drive signal Ap only have respectively with height
The corresponding two kinds of level states of level voltage Vh and low level voltage Vl, wherein, magnitude of voltage Vh>Vr.Below still to drive letter
In case of number Ap sequence (having pseudo-random code sequence characteristic) is [+1 ,+1, -1, -1].Because drive signal Ap only has
Two kinds of level states, thus it is adjacent in drive signal Ap and two sequence codes of identical are easily caused carrying for the subsequent conditioning circuit bit error rate
Rise, so needing known drive signal Ap set in advance to system sequence to be handled to avoid this phenomenon.
As shown in fig. 7, for controlling the reset signal rst of the reset switch K1 in front-end detection circuit that there is cycle T 2.
When each cycle T 2 starts, reset signal rst is changed into effective status from disarmed state, (the tr after tr after a while<T2),
Reset signal rst is changed into disarmed state from effective status, and continues for some time T2-tr so that current sequence code can be kept
Time enough is to complete sampling processes of the sampling switch K2 to current sequence code, after the completion of sampling process, and sampling switch K2 is closed
Disconnected, next cycle T2 starts and repeats said process.
At the time of each reset signal rst is from being effectively changed into invalid, drive signal Ap's under reset condition works as preamble
Row code conversion is next sequence code of current sequence code.To realize adjacent in original drive signal Ap and two sequences of identical
Isolation between code, can insert opposite with the level state of two sequence codes between adjacent and two sequence codes of identical
Insertion code.Specifically, after reset signal rst is changed into effective status from disarmed state, drive signal Ap is by current sequence code
Being transformed to the next sequence code same and adjacent with current sequence code, current sequence code-phase has the insertion of opposite levels state
Code, in same period T2, before reset signal rst is changed into disarmed state from effective status, drive signal Ap is inserted by currently
Enter code conversion there is next sequence code of opposite levels state with being currently inserted into code.And adjacent two in the drive signal Ap
It is that flanking sequence can be achieved without adding insertion code between two sequence codes when individual sequence code has different level states
The separation of code, reset signal is changed into disarmed state from effective status in current period T2 finish time or next cycle T 2
At the time of be can be achieved sequence code switching.
For example in the figure 7, in drive signal Ap the continuous sequence code of 4 is respectively：Ap [1]=+ 1, Ap [2]=+ 1,
Ap [3]=- 1 and Ap [4]=- 1.Because sequence code Ap [1] therein is adjacent and identical with Ap [2], sequence code Ap [3] and Ap
[4] it is adjacent and identical, it is therefore desirable to an insertion code In [12]=- 1 to be inserted between Ap [1] and Ap [2], in Ap [3] and Ap
[4] an insertion code In [34]=+ 1 is inserted between, to realize the isolation between identical and adjacent sequence code.
At the t1 moment, sampling switch K2 completes sampling process of the cycle to the first induced signal S1, and in sampled signal
Turned off under sh control, reset signal rst is changed into effective status from disarmed state.After the t1 moment, before the t1+tr moment or
T1 moment, drive signal Ap magnitude of voltage is transformed to insert code In [12] low electricity by sequence code Ap [1] high level voltage Vh
Ordinary telegram presses Vl, and then, before t1+tr moment or t1+tr moment, drive signal Ap magnitude of voltage is by the low of insertion code In [12]
Level voltage Vl is transformed to sequence code Ap [2] high level voltage Vh.Because the duration for inserting code is very short, it is not enough to complete
The quantization and detection of inductance capacitance, and within the duration of insertion code, front-end detection circuit is in reset state, therefore drives
Move unaffected as the sequence code of valid data in signal Ap, still the characteristic with pseudo noise code.
Similarly, at the t2 moment, sampling switch K2 completes sampling process of the cycle to the first induced signal S1, and in sampling
Turned off under signal sh control, reset signal rst is changed into effective status from disarmed state.After the t2 moment, before the t2+tr moment or
Person is transformed to insert code In's [34] in t2 moment, drive signal Ap magnitude of voltage by sequence code Ap [3] low level voltage Vl
High level voltage Vh, then, before t2+tr moment or t2+tr moment, drive signal Ap magnitude of voltage is by insertion code In [12]
High level voltage Vh be transformed to sequence code Ap [2] low level voltage Vl.
Add because the level state of sequence code Ap [2] and the Ap [3] in drive signal Ap is differed, therefore between
Enter to insert code.Drive signal Ap sequence code Ap [2] resets in current period T2 finish time t3 or next cycle T 2
T4 is converted into sequence code Ap [3] at the time of signal rst is changed into disarmed state from effective status.
Induction installation according to embodiments of the present invention, the drive signal and offseting signal generated by using sequence generator
Inhibit the interference signals such as common-mode noise, thus improved on the premise of useful data is not influenceed induction installation signal to noise ratio and
Antijamming capability, while also achieving to the isolation between each sequence code in drive signal sequence to ensure the accurate of induction installation
Property.
Fig. 8 shows the schematic flow sheet of the driving method for induction installation of second embodiment of the invention.The present invention the
The driving method of two embodiments includes step S301 to S306.
In step S301, offseting signal and drive signal are produced.Drive signal and offseting signal are synchronously and with the time point
The product for each sequence code sequence code corresponding with offseting signal sequence not being rendered as in one-dimensional sequence, drive signal sequence
For 1.
As a kind of embodiment, as shown in fig. 6, drive signal have respectively with high level voltage Vh, low level voltage Vl
And the corresponding three kinds of level states of resetting voltage Vr, wherein, magnitude of voltage Vh>Vr>Vl.Each sequence in drive signal sequence
Code division not Dui Ying a data cycle, each data cycle is divided into reseting stage and data and kept for the stage.In reseting stage, drive
The magnitude of voltage of dynamic signal is equal to resetting voltage Vr；Within the data holding stage, when the sequence code of drive signal is+1, driving letter
Number magnitude of voltage be high level voltage Vh, when the sequence code of drive signal is -1, the magnitude of voltage of drive signal is low level electricity
Press Vl.So that after being transmitted the magnitude of voltage of drive signal can revert to again each sequence code in drive signal sequence
Position voltage Vr is to carry out the transmission of next sequence code.
As a kind of alternative embodiment, as shown in fig. 7, drive signal only have respectively with high level voltage Vh and low
The corresponding two kinds of level states of level voltage Vl, wherein, magnitude of voltage Vh>Vl.To avoid the bit error rate in follow-up signal processing procedure
Lifting, insertion code can be added between adjacent in drive signal sequence and two sequence codes of identical so that adjacent and identical
Two sequence codes it is separate.Wherein, insertion code appears in the reseting stage for the integrating capacitor being connected with inductance capacitance, therefore
The valid data in drive signal sequence are not interfered with.
In step s 302, drive signal is applied in each driving electrodes in induction installation.
In step S303, the quantity of electric charge detected in sensing electrode is converted into multiple first senses of electrical signal form
Induction signal.
It is two stages that step S303, which is divided to, in the first phase, inductance capacitance stored charge in the presence of drive signal,
In second stage, by inductance capacitance accumulate the integrating capacitor after obtained electric charge reassigns to inductance capacitance and resetted this
In two electric capacity, because the sensing electrode in inductance capacitance is connected with one end of integrating capacitor, and the voltage of sensing electrode is fixed,
It can be considered that inductance capacitance is in driving when the first induced signal that the integrating capacitor other end is provided is completed with the first stage
The quantity of electric charge accumulated in the presence of signal has linear relationship, so as to realize the quantity of electric charge detected in sensing electrode conversion
For the process of the first induced signal of electrical signal form.
In step s 304, multiple first induced signals will be multiplied with offseting signal respectively, to obtain multiple second senses
Induction signal.Not only comprising the useful signal that is produced according to drive signal in first induced signal, also comprising being introduced by charger etc.
The interference signal such as common-mode signal, interference signal carries out multiplying with useful signal with offseting signal, so that interference signal
The calculating process of convolution is completed on frequency band with offseting signal.Because the frequency band of offseting signal is wider, and the frequency band of interference signal
Narrower, therefore, the frequency spectrum of interference signal is shifted on the frequency band of offseting signal, and the energy of interference signal is disperseed.
In step S305, multiple second induced signals are carried out with cumulative post filtering and obtains the 3rd induced signal.By right
It is located at the part outside filtering bandwidth in the process of the cumulative filtering of second induced signal, interference signal to be filtered out, so that dry
Disturb the energy being dispersed in signal outside filtering bandwidth to be suppressed, and then improve the signal to noise ratio of the 3rd induced signal.
In step S306, the 3rd induced signal is converted to the data-signal that can be recognized by subsequent module.
Driving method for induction installation according to embodiments of the present invention, the driving generated by using sequence generator
Signal inhibits the interference signals such as common-mode noise with offseting signal, so as to improve sensing on the premise of useful data is not influenceed
The signal to noise ratio and antijamming capability of device, while also achieving to the isolation between each sequence code in drive signal sequence to ensure
The accuracy of induction installation.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or deposited between operating
In any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Nonexcludability is included, so that process, method, article or equipment including a series of key elements not only will including those
Element, but also other key elements including being not expressly set out, or also include being this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Also there is other identical element in process, method, article or equipment including the key element.
According to embodiments of the invention as described above, these embodiments do not have all details of detailed descriptionthe, not yet
It is only described specific embodiment to limit the invention.Obviously, as described above, it can make many modifications and variations.This explanation
Book is chosen and specifically describes these embodiments, is in order to preferably explain the principle and practical application of the present invention, so that affiliated
Technical field technical staff can be used using modification of the invention and on the basis of the present invention well.
Claims (10)
1. a kind of induction installation, it is characterised in that including：
Sequence generator, for providing drive signal and offseting signal；
Multiple driving electrodes and multiple sensing electrodes below the induction installation touch-surface, the multiple driving electrodes
Multiple inductance capacitances are formed with the multiple sensing electrode, the multiple driving electrodes receive the drive signal；
Front-end detection module, is connected with the multiple sensing electrode, for respectively by the capacitance of the multiple inductance capacitance or
Capacitance change is converted into multiple first induced signals of electrical signal form；
Computing module, for carrying out calculation process to the multiple first induced signal to obtain respectively according to the offseting signal
Multiple second induced signals；
Cumulative filtration module, the 3rd induced signal is obtained for carrying out cumulative post filtering to the multiple second induced signal；With
And
Communication module, the 3rd induced signal is converted to the data-signal output for meeting specified data format,
Wherein, the offseting signal is synchronous with the drive signal and is rendered as one-dimensional sequence, the driving letter respectively with the time
Each sequence code in number sequence is 1 with the product of corresponding sequence code in the offseting signal sequence.
2. induction installation according to claim 1, wherein, the drive signal sequence includes pseudo-random code sequence or had
The sequence of class white noise spectrum characteristic.
3. induction installation according to claim 1, wherein, the front-end detection module includes multiple detection units, described
The input of multiple detection units is corresponding with the multiple sensing electrode to be connected, and the output end of each detection unit provides one
Individual first induced signal.
4. induction installation according to claim 3, wherein, each detection unit includes：
Operational amplifier, with first input end, the second input and output end, the first input end receives reference voltage,
Second input is connected with corresponding sensing electrode；
Integrating capacitor, the second input and the operation amplifier of the two ends of the integrating capacitor respectively with the operational amplifier
The output end of device is connected to provide corresponding first induced signal；
Reset switch, in parallel with the integrating capacitor, the reset switch is controlled by reset signal.
5. induction installation according to claim 4, wherein, the first input end of the operational amplifier inputs for positive
End, the second input of the operational amplifier is inverting input.
6. induction installation according to claim 3, wherein, the computing module includes multiple arithmetic elements, the multiple
The input of arithmetic element is corresponding with the output end of the multiple detection unit to be connected, and the output end of each arithmetic element is carried
For second induced signal.
7. induction installation according to claim 4, wherein, each arithmetic element includes：
Sampling switch, for being sampled under the control of sampled signal to first induced signal；
Mlultiplying circuit, for being multiplied to the sampled result of the sampling switch and the offseting signal to obtain second sensing
Signal.
8. a kind of driving method for induction installation, the induction installation is included under the touch-surface of the induction installation
The multiple driving electrodes and multiple sensing electrodes of side, the multiple driving electrodes form multiple sensings with the multiple sensing electrode
Electric capacity, wherein, the driving method includes：
Drive signal and offseting signal are produced, the offseting signal is synchronous with the drive signal and is rendered as one respectively with the time
Sequence is tieed up, each sequence code in the drive signal sequence is with the product of corresponding sequence code in the offseting signal sequence
1；
The drive signal is applied in the multiple driving electrodes；
The quantity of electric charge detected in the multiple sensing electrode is separately converted to multiple first sensing letters of electrical signal form
Number；
The multiple first induced signal is multiplied with the offseting signal respectively, to obtain multiple second induced signals；
Cumulative post filtering is carried out to the multiple second induced signal and obtains the 3rd induced signal；And believe the described 3rd sensing
Number be converted to the data-signal for meeting specified data format.
9. driving method according to claim 8, wherein, the drive signal has two kinds of shapes of high level and low level
The state of state and two sequence codes is added between state, adjacent in the drive signal sequence and state identical sequence code
Opposite insertion code.
10. driving method according to claim 8, wherein, the drive signal has high level, low level and reset
Three kinds of states of level, the reset is returned to before each sequence code of the drive signal sequence starts by the drive signal
The state of level.
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