CN109144305A - Highly sensitive capacitance touch-control device and its operation method - Google Patents
Highly sensitive capacitance touch-control device and its operation method Download PDFInfo
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- CN109144305A CN109144305A CN201810155262.3A CN201810155262A CN109144305A CN 109144305 A CN109144305 A CN 109144305A CN 201810155262 A CN201810155262 A CN 201810155262A CN 109144305 A CN109144305 A CN 109144305A
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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
Abstract
A kind of capacitance touch-control device comprising touch panel and control chip.The touch panel includes detecting electrode to form self-induction and Inductance and Capacitance.The control chip includes artificial circuit and subtraction circuit.The artificial circuit is to export reference signal.The subtraction circuit couples the artificial circuit and the detecting electrode, the reference signal that the artificial circuit is exported and the detection signal of detecting electrode output carry out calculus of differences and detect signal with output difference, and contact event is identified according to the differential sense signal, so as to electric energy needed for saving contact detection.
Description
Technical field
Capacitance touch-control device and its running side of the present invention in relation to a kind of touch device, particularly in relation to a kind of high sensitivity
Method.
Background technique
Touch panel has been widely used in various electronic device due to that user can be allowed with intuitive operation.Touch-control
Panel generally can be divided into condenser type, resistance-type and optical touch control panel.
Capacitive touch device can be further discriminated between again as (the self-capacitive contact of self-tolerant touch device
Sensor) and mutual capacitance type touch device (mutual capacitive contact sensor), both touch devices have difference
Capacitance variations characteristic, thus be applicable to different function.For example, mutual capacitance type touch device is used for multiple spot detection
(multi- contact detection) and self-tolerant touch device to suspension procedure sensitivity with higher and to water droplet have compared with
Low sensitivity.However, how to improve contact sensitivity is an important topic in both capacitive touch devices.
Summary of the invention
In view of this, the present invention proposes a kind of capacitance touch-control device of high sensitivity.
The present invention provides a kind of capacitance touch-control device, and setting artificial circuit is to generate reference signal in control chip
Using the cancellation value (cancellation) as detection signal, so as to reducing the size of sensing capacitor in the control chip.
The present invention provides a kind of capacitance touch-control device, and setting artificial circuit is to generate reference signal in control chip
Using the cancellation value as detection signal, so as to increasing the sensitivity of contact detection.
The present invention provides a kind of capacitance touch-control device, includes touch panel, amplifying circuit, artificial circuit and subtraction electricity
Road.The touch panel includes detecting electrode.The amplifying circuit couples the detecting electrode, for working as the detecting electrode not
Output first detection signal and the second detection of output signal when the detecting electrode incudes and contacts when induction contact.The emulation
Circuit is for exporting reference signal.It is poor that the subtraction circuit is used to carry out for the reference signal and the first detection signal
Partite transport is calculated to generate the first differential sense signal, and carries out calculus of differences for the reference signal and the second detection signal
To generate the second differential sense signal, wherein first differential sense signal and the second differential sense signal reverse phase.
The present invention also provides a kind of capacitance touch-control device, comprising touch panel, detection capacitor, input resistance, amplifying circuit,
Artificial circuit and subtraction circuit.The touch panel includes detecting electrode, and the touch panel is for operating in from appearance detection
Mode or mutual tolerance detection pattern.The detection capacitor is used in the signal for being coupled to the detecting electrode from appearance detection pattern
Input terminal is simultaneously not coupled to the signal input part of the detecting electrode in the mutual tolerance detection pattern.The input resistance coupling
Connect the signal output end of the detecting electrode.The amplifying circuit couples the input resistance, and for exporting detection signal.Institute
Stating artificial circuit includes analog detection capacitor, simulation self-induction capacitor, simulation Inductance and Capacitance, simulation input resistance and Simulation scale-up electricity
Road, the artificial circuit be used for it is described from hold detection pattern under according to the analog detection capacitor, the simulation self-induction capacitor,
The simulation input resistance and first reference signal of Simulation scale-up circuit output or the basis under the mutual tolerance detection pattern
The simulation Inductance and Capacitance, the simulation input resistance and second reference signal of Simulation scale-up circuit output.The subtraction
Circuit be used for it is described from hold detection pattern under for the detection signal and first reference signal progress calculus of differences or
Calculus of differences is carried out to generate difference for the detection signal and second reference signal under the mutual tolerance detection pattern
Detect signal.
The present invention also provides a kind of capacitance touch-control devices, include touch panel, input resistance, amplifying circuit, flash memory, number
Analog converter and subtraction circuit.The touch panel includes detecting electrode.The input resistance couples the detecting electrode
Signal output end.The amplifying circuit couples the input resistance, and for exporting detection signal.The flash memory stores in advance
There is at least one numerical data.The digital analog converter is used to export at least one according at least one described numerical data
Reference signal.The subtraction circuit be used for for the detection signal and at least one described reference signal progress calculus of differences with
Generate differential sense signal.
The capacitance touch-control device that the present invention illustrates is applicable to be used only from the touch device for holding detection and use simultaneously
From the touch device for holding detection with the bimodulus detection (dual-mode detection) of mutual tolerance detection.
In order to which above and other objects, features and advantages of the invention can be become apparent from, will hereafter be illustrated appended by cooperation, in detail
Carefully it is described as follows.In addition, identical component is indicated in explanation of the invention with identical symbol, first state clearly herein.
Detailed description of the invention
Fig. 1 is the block schematic diagram of the capacitance touch-control device of one embodiment of the invention；
Fig. 2 is the block schematic diagram of the capacitance touch-control device of one embodiment of the invention；
Fig. 3 is another block schematic diagram of the capacitance touch-control device of one embodiment of the invention；
Fig. 4 A is the waveform that signal and reference signal are detected in the capacitance touch-control device of Fig. 2-3 embodiment；
The waveform of the differential sense signal of detection signal and reference signal that Fig. 4 B is Fig. 4 A；
Fig. 5 is the flow chart of the operation method of the capacitance touch-control device of one embodiment of the invention；
Fig. 6 is the frequency response of the filter circuit of the capacitance touch-control device of one embodiment of the invention；
Fig. 7 is the block diagram of the capacitance touch-control device of another embodiment of the present invention；
Fig. 8 A is the circuit diagram of the artificial circuit of the capacitance touch-control device of another embodiment of the present invention；
Fig. 8 B is the block diagram of the artificial circuit of the capacitance touch-control device of another embodiment of the present invention；
Fig. 9 A-9B is the circuit diagram of the phase reference circuit of the capacitance touch-control device of another embodiment of the present invention；And
Fig. 9 C-9D is the block diagram of the phase reference circuit of the capacitance touch-control device of another embodiment of the present invention.
Description of symbols
1 capacitance touch-control device
11 driving circuits
13 touch panels
131 detecting electrodes
15 AFE(analog front end)s
150 ' artificial circuits
15A amplifying circuit
152 subtraction circuits
155 detection circuits
156 phase reference circuits
16 digital back-ends
CinDetect capacitor
CmInductance and Capacitance
CSSelf-induction capacitor
RinInput resistance
So1Detect signal
Sref' reference signal
SdiffDifferential sense signal
SprefPhase reference signal.
Specific embodiment
It please refers to shown in Fig. 1, is the block schematic diagram of the capacitance touch-control device of one embodiment of the invention.Capacitance touching control dress
It sets 1 and includes control chip 100 and touch panel 13；Wherein, the capacitance touch-control device 1 is preferably using appearance detection pattern certainly
(self-capacitive mode) is detected.In some embodiments, the capacitance touch-control device 1 can utilize appearance certainly to timesharing
Detection pattern and mutual tolerance detection pattern (mutual capacitive mode) detection close to object and judge position of touch.Example
Such as, in some embodiments, due to described from shorter during the scanning for holding detection pattern, the capacitance touch-control device 1 can be first with
It is described to identify whether to have that object is close from holding detection pattern, when determining close to object, then recycle the mutual tolerance detection mould
Formula identifies position of touch；In other embodiments, the capacitance touch-control device 1 can be first with described close from detection pattern judgement is held
The rough position (rough position) of object simultaneously determines desire detection range (window of interest, WOI), then again
The exact position (fine position) in the desire detection range is identified using the mutual tolerance detection pattern, so as to reducing institute
State the data volume of required processing in mutual tolerance detection pattern.It should be noted that above-mentioned from appearance detection pattern and mutual tolerance detection pattern
Embodiment be only to illustrate, but be not intended to limit the invention explanation.
The touch panel 13 includes multiple detecting electrodes 131 to be respectively formed self-induction capacitor Cs；Wherein, the detection
Electrode 131 includes that multiple driving electrodes and multiple receiving electrodes extend different directions, such as are mutually orthogonal to one another, the driving
Inductance and Capacitance C can be formed between electrode and the receiving electrodem(referring to Fig. 2 and 3).In capacitance touching control panel formed self-induction capacitor with
The principle of Inductance and Capacitance be it is known that and the theme that illustrates of itself and non-present invention, therefore repeated no more in this.
The control chip 100 includes multiple driving circuits 11, multiple detection capacitor CinAnd artificial circuit 150；Wherein,
The artificial circuit 15 is to simulate from the circuit characteristic for holding the detection route under detection pattern (after citing is specified in).It is described from
Hold under detection pattern, the driving circuit 11 and detection capacitor CinThe detection electricity is electrically coupled to by pin (pin)
The signal input part of pole 131.The driving circuit 11 to output drive signal Sd, such as sine wave, cosine wave, square wave etc. extremely
The detecting electrode 131.Under mutual tolerance detection pattern, the only 11 output drive signal Sd of driving circuit of corresponding driving electrodes, and
The driving circuit 11 of corresponding receiving electrode is open.
Shown in referring to figure 2., for the block schematic diagram of the capacitance touch-control device of the present invention one embodiment of explanation.Such as preceding institute
It states, the capacitance touch-control device 1 includes touch panel 13 and control chip 100.The control chip 100 includes multiple drivings
Circuit 11, multiple detection capacitor Cin, AFE(analog front end) 15 and digital back-end 16；Wherein, the digital back-end 16 and non-present invention
The theme of explanation, therefore repeated no more in this.In present invention explanation, the driving circuit 11 can pass through the detection capacitor CinElectrically
It is coupled to the signal input part (such as under appearance detection pattern) of detecting electrode 131, or can bypass (bypass) described detection electricity
Hold CinIt is electrically coupled to the signal input part (such as under mutual tolerance detection pattern) of the detecting electrode 131；Wherein, setting can be passed through
Multiple switching switch SW1It is realized between the driving circuit 11 and the touch panel 13.
The AFE(analog front end) 15 includes artificial circuit 150, multiple programmable filters 151, subtraction circuit 52, gain circuitry
153 and anti-noise acoustic filter (AAF) 154.The programmable filter 151 and detection capacitor CinAnd the detecting electrode
131 self-induction capacitor CsForm the first filter circuit；Wherein, first filter circuit be, for example, bandpass filter (BPF) or
High-pass filter (HPF), first filter circuit can and then be formed by low-pass filter with the anti-noise acoustic filter 154
Form the bandpass filter with default bandwidth.In one embodiment, the signal output end of each detecting electrode 131 is all connected with (example
Such as pass through switch element) programmable filter 151.It should be noted that although Fig. 2 and 3 only shows the detection electricity of landscape configuration
Pole 131 connects programmable filter 151, and in other embodiments, programmable filter 151 is also connected to the detection electricity longitudinally configured
Pole 131, however it is not limited to shown in Fig. 2-3.The connection type of programmable filtering device 151 can be according to the behaviour of capacitance touch-control device 1
Depending on operation mode.
The artificial circuit 150 forms the second filter circuit, and to export reference signal Sref；Wherein, second filter
Wave circuit is, for example, bandwidth-limited circuit or high-pass filtering circuit, and second filter circuit can and then be filtered with the antinoise
Device 154 is formed by low-pass filter and forms the bandpass filter with default bandwidth.The subtraction circuit 152 couples described imitative
True circuit 150, to pass through switching switch SW under appearance detection pattern certainly2Successively programmable filter 151 described in electric property coupling,
To be electrically coupled to the detecting electrode 131 in turn.The subtraction circuit 152 is to the institute that exports the artificial circuit 150
State reference signal SrefWith the detection signal S of the programmable filter 151 output coupledo1Calculus of differences is carried out to export
Differential sense signal Sdiff.In more detail, in present invention explanation, the detection capacitor CinBy multiple switchings switch (such as
SW1) it is electrically coupled to the signal input part of the detecting electrode 131 respectively, and the subtraction circuit 152 passes through multiple switchings
Switch (such as SW2) it is electrically coupled to the programmable filter 151 and detecting electrode 131 respectively.
In present invention explanation, the detection capacitor CinBe set in the control chip 100, to self-induction capacitor CsShape
At partial pressure.Whereby, the capacitance touch-control device 1 can be according to the differential sense signal SdiffPeak to peak value (peak-to-
Peak values) variation judgement contact event；Wherein, the differential sense signal SdiffFor time-continuous signal；Wherein, exist
Before judging contact event, the differential sense signal SdiffIt can further be filtered, be digitized.For example, Fig. 2 display contact is poor
Sorting surveys signal SContactAnd not in contact with differential sense signal SNot in contact with.However, due to the self-induction capacitor CsIt is usually quite big, because
This is to reach effective partial pressure, it is also desirable to very big detection capacitor Cin, thus opposite installation space is needed in chip, therefore nothing
Method reduces the overall dimensions of the control chip 100.
Therefore, in present invention explanation, by the way that the artificial circuit 150 is arranged with analog detection route (for example, from the drive
Dynamic circuit 11 passes through the detection capacitor Cin, the detecting electrode 131 and the programmable filter 151) circuit characteristic with
Export the reference signal SrefUsing as the detection signal So1Cancellation value, as shown in Figure 4 A.By from the detection signal
So1It deducts the cancellation value and reduces direct current signal level, the detection capacitor C can be reducedinValue.For example, the detection
Capacitor CinCapacitance be preferably less than the self-induction capacitor CsCapacitance 10%.Therefore, it is brilliant to can effectively reduce the control
The overall dimensions of piece 100.
In order to make the contact differential sense signal SContactWith described not in contact with differential sense signal SNot in contact withBetween difference more
Obviously, in some embodiments, gain circuitry 153 can be used to amplify the differential sense signal Sdiff；Wherein, the gain circuitry
153 yield value (gain) can determine according to the analytical range of the analog digital converting unit (ADC) in the digital back-end 16
It is fixed, have no specific limitation.As shown in Fig. 2, in the output signal (differential sense signal after amplifying) of the gain circuitry 153,
The contact differential sense signal SContactWith described not in contact with differential sense signal SNot in contact withBetween difference increase, therefore can be lighter
It changes places and identifies whether to be in contact event.Then, the anti-noise acoustic filter 154 is to differential sense signal after the amplification
It is filtered, as previously mentioned, the anti-noise acoustic filter 154 is, for example, low-pass filter.
Shown in referring to figure 3., for another block schematic diagram of the capacitance touch-control device of the present invention one embodiment of explanation；Its
In, Fig. 3 also shows the embodiment of the artificial circuit 150 and the programmable filter 151.
In some embodiments, the programmable filter 151 includes input resistance RinAnd amplifying circuit 15A；Wherein, described
Detect capacitor Cin, the self-induction capacitor Cs, the input resistance RinAnd the amplifying circuit 15A forms the first filter circuit and institute
It states artificial circuit 150 and forms the second filter circuit.As previously mentioned, the subtraction circuit 152 is to by first filter circuit
The detection signal S of outputo1With the reference signal S of second filter circuit outputrefCalculus of differences is carried out to detect with output difference
Signal Sdiff, referring to Fig. 4 A-4B；Wherein, Fig. 4 B is the detection signal S of Fig. 4 Ao1With reference signal SrefDifferential sense signal
SdiffWaveform.
In one embodiment, the amplifying circuit 15A is integral programmed gain amplifying circuit (IPGA).For example, described
Amplifying circuit 15A includes operational amplifier OP, feedback resistance Rf and compensating electric capacity Cf.The feedback resistance Rf and compensation electricity
Hold Cf to be connected across between the negative input end and output end of the operational amplifier OP, the input resistance RinIt is coupled to the detection electricity
Between the second end (i.e. signal output end) of pole 131 and the negative input end of the operational amplifier OP, the of the detecting electrode 131
One end (i.e. signal input part) couples the detection capacitor Cin.In the present embodiment, the frequency response of first filter circuit can
It is indicated with the Bode diagram (Bode diagram) of equation (1) and Fig. 6, first filter circuit has two poles (pole)
And zero point (zero) is located at 0
(Vout/Vin)=- (Rf/Rin)×(s·Cin·Rin)/(1+s·Rf·Cf)×(1+s·Rin·Cs+s·Rin·
Cin) (1)
As previously described, because cancellation value of the output of the artificial circuit 150 as first filter circuit, described imitative
The frequency response of true circuit 150 is preferably similar to first filter circuit, that is, the frequency response of the artificial circuit 150
It is determined according to the frequency response of first filter circuit.In some embodiments, two frequency response it is similar for example comprising, but
It is not limited to, two poles of two poles of the artificial circuit 150 close to first filter circuit.For example, the emulation electricity
Two poles on road 150 can determine according to two poles of first filter circuit, and since zero point at this time does not influence, therefore only need
Consider pole frequency.For example, the pole frequency (pole frequency) and described second of two poles of the artificial circuit 150
The difference on the frequency of the corresponding pole of filter circuit is designed as 35% lower than the pole frequency, preferably shorter than 20%.Although reason
It is closer better by two poles of the upper artificial circuit 150 and two poles of first filter circuit, however due to reality
The self-induction capacitor C of upper each detecting electrode 131sIt is not easy accurately to learn in advance, therefore is designed in a manner of estimating described
Artificial circuit 150.
In one embodiment, the artificial circuit 150 includes analog detection capacitor Cref_in, simulation self-induction capacitor Cref_s, simulation
Input resistance Rref_inAnd Simulation scale-up circuit 15B, and the analog detection capacitor Cref_in, the simulation self-induction capacitor
Cref_s, the simulation input resistance Rref_inThe detection capacitor is identical to the connection type of the Simulation scale-up circuit 15B
Cin, the self-induction capacitor Cs, the input resistance RinWith the connection type of the amplifying circuit 15A, to obtain similar frequency
Response.That is, the simulation self-induction capacitor Cref_sSelf-induction capacitor C to analog detection electrode 131s, the analog detection electricity
Hold Cref_inCorresponding analog detection capacitor Cin, the simulation input resistance Rref_inCorresponding input resistance Rin, the simulation puts
The corresponding amplifying circuit 15A of big circuit 15B.It should be noted that the circuit parameter (pole RC value) of the artificial circuit 150 can not
It is entirely identical to the circuit parameter of the first filter circuit, as long as the artificial circuit 150 has phase with first filter circuit
As frequency response and the detection capacitor C can be reduceds, have no specific limitation.
The Simulation scale-up circuit 15B equally includes operational amplifier OP', analog feedback resistance Rref_fAnd analog compensation
Capacitor Cref_f；Wherein, the connection type of element is identical to the amplifying circuit 15A in the Simulation scale-up circuit 15B.Therefore,
The second filter circuit that the artificial circuit 150 is formed equally has similar equation (1) and the frequency response of Fig. 6, difference
Being in all component parameters in the artificial circuit 150 is prior design.Therefore, by changing the artificial circuit
The position of two extreme values can be adjusted in component parameters in 150, i.e. resistance value and capacitance.
Shown in referring to figure 5., the flow chart of the operation method of the capacitance touch-control device of embodiment is illustrated for the present invention,
Comprising holding detection pattern (step S certainly51) and mutual tolerance detection pattern (step S52).In the present embodiment, it is described from hold detection pattern with
It operates to the mutual tolerance detection pattern timesharing, such as first with described from detection pattern judgement is held close to object and/or model to be detected
(WOI) is enclosed, position of touch and/or gesture are then judged with the mutual tolerance detection pattern again.
Under the detection pattern from appearance, the driving circuit 11 is passed through into the detection capacitor CinIt is electrically coupled to institute respectively
The first end of driving electrodes 131 is stated, and the subtraction circuit 152 is successively electrically coupled to the second of the driving electrodes 131
End.Simultaneously as the subtraction circuit 152 receives the reference signal S that the artificial circuit 150 exportsrefAnd the subtraction circuit
152 are electrically coupled to the second end of the driving electrodes 131, therefore the subtraction circuit by programmable filter 151
The 152 detection signal S that the programmable filter 151 can be exportedo1With the reference signal of the artificial circuit 150 output
SrefIt carries out calculus of differences and signal S is detected with output differencediff, as shown in fig. 4 a and 4b.Then, gain circuitry 153 can be used to put
The big differential sense signal SdiffSo that contact differential sense signal SContactWith not in contact with differential sense signal SNot in contact withBetween difference
It is different to become apparent, as shown in Figure 2.In addition, only detecting the inspection of multiple driving electrodes or the output of multiple receiving electrodes in an embodiment
Signal is surveyed, it, so can be to be operated during shorter scanning to judge whether there is the generation of contact event.
In another embodiment, the detection signal of multiple driving electrodes and the output of multiple receiving electrodes can detect, in mutual
Hold and substantially identifies desire detection range (WOI) under detection pattern.Therefore, described from holding under detection pattern, also by the driving circuit
11 pass through the detection capacitor CinIt is electrically coupled to the first end (i.e. signal input part) of the receiving electrode 131 respectively, and will
The subtraction circuit 152 is successively electrically coupled to the second end (i.e. signal output end) of the receiving electrode 131.Felt by judgement
It measures close to after the driving electrodes of object and receiving electrode, can determine the desire detection range.As described above, the present invention is said
In bright, the driving electrodes and the receiving electrode belong to detecting electrode 131, therebetween to generate Inductance and Capacitance Cm。
Under the mutual tolerance detection pattern, the driving circuit 11 does not pass through the detection capacitor CinIt is electrically coupled to respectively
The first end of the driving electrodes 131；Such as in Fig. 2-3, the driving circuit 11 utilizes switching switch SW1Bypass
(bypass) the detection capacitor CinAnd directly by driving signal SdIt is input to detecting electrode 131.In addition, the antinoise filtering
Device 154 is not electrically coupled to the second end of the driving electrodes 131 successively by the subtraction circuit 152, such as schemes
In 2-3, the anti-noise acoustic filter 154 utilizes another switching switch SW2Bypass (and the gain electricity of the subtraction circuit 152
Road 153) so that the detection signal S of the programmable filter 151 outputo1It is directly output to the anti-noise acoustic filter 154.
The filtering parameter of the anti-noise acoustic filter 154 can be determined according to practical application, have no specific limitation.
In present invention explanation, under holding detection pattern, the signal of route is detected and without panel due to being sent to
Resistance and capacitor, therefore the phase difference between reference line (i.e. artificial circuit) and detection route is unobvious, therefore reference signal SrefIt can
As the cancellation value deducted in detection signal.
It should be noted that although display is not in contact with differential sense signal S in Fig. 2Not in contact withAmplitude (or peak to peak value) it is big
In contact differential sense signal SContactAmplitude (or peak to peak value), so its be only to illustrate and be not intended to limit the invention
It is bright.According to the parameter setting (i.e. RC value) of the artificial circuit 150, the contact differential sense signal SContactAmplitude may be big
In described not in contact with differential sense signal SNot in contact with。
It should be noted that although showing detection signal S in Fig. 4 Ao1Amplitude (or peak to peak value) be greater than reference signal
SrefAmplitude (or peak to peak value), so its be only to illustrate and be not intended to limit the invention explanation.According to the artificial circuit
150 parameter setting (i.e. RC value), the reference signal SrefAmplitude may also be greater than the detection signal So1Amplitude.
In other embodiments, by changing the circuit parameter of artificial circuit 150, it can be used for waking up capacitance touch-control device 1
Suspend mode.Under this suspend mode, the movement for contacting detection is largely completed by AFE(analog front end) 15, can reduce digital back-end
16 complicated post processing operations amount and whole energy consumption can be reduced.
It please refers to shown in Fig. 7, is the block diagram of the capacitance touch-control device 1 of another embodiment of the present invention.The present embodiment
AFE(analog front end) 15 additionally comprises wake operation in the mechanism of the capacitance touch-control device 1 of suspend mode.In other words, the capacitive touch of Fig. 7
Control device 1 can be combined in Fig. 3, such as AFE(analog front end) 15 additionally comprises multiplexer or switching switch and (such as switches on subtraction circuit
Between 152 and gain circuitry 153 and detection circuit 155), to switch to the circuit connection of Fig. 7 under suspend mode and in normal
The circuit connection of Fig. 3 is switched under mode (non-sleep mode), wherein the normal mode be, for example, calculate position of touch and/
Or the mode of gesture, the suspend mode do not calculate the mode of position of touch and gesture e.g..Whereby, it is detected using Fig. 7
After contact event, then it can be operated with the function mode of Fig. 2-3 and 5.
As previously mentioned, capacitance touch-control device 1 includes touch panel 13, driving end and test side.The test side includes mould
Quasi- front end 15 and digital back-end 16.Driving circuit 11, the multiple switching switch SW that the driving end is included1And detection capacitor
Cin, the touch panel 13 detecting electrode 131 and the digital back-end 16 that are included related content it is stated that in preceding implementation
Example.For example, the touch panel 13 is operable in from appearance detection pattern or mutual tolerance detection pattern.The detection capacitor CinFor
It is described to be coupled to the signal input part of the detecting electrode 131 and in the mutual tolerance detection pattern from the inspection from holding detection pattern
The signal input part for surveying electrode 131 is switched switch SW1It bypasses and is not attached to detecting electrode 131.
AFE(analog front end) 15 includes multiple input resistance Rin, multiple amplifying circuit 15A (referring to shown in Fig. 3), artificial circuit
150 ', subtraction circuit 152, detection circuit 155 and phase reference circuit 156；Wherein the detection circuit 155 is phase-detection
Circuit.As previously mentioned, driving end and test side are set in control chip 100.
As previously mentioned, the multiple input resistance RinIt is respectively coupled to the signal output end of detecting electrode 131.It is the multiple
Amplifying circuit 15A passes through the multiple input resistance RinThe detecting electrode 131 is coupled, and for exporting detection signal So1.When
When conductor contact or close touch panel 13, detection signal S will lead too1It changes.For example, Fig. 7 is shown when detecting electrode 131
When not incuding contact, amplifying circuit 15A exports first detection signal So11；When detecting electrode 131, which incudes, to be contacted, amplifying circuit
The second detection of 15A output signal So12.In present invention explanation, unless otherwise specified, detection signal So1It can be first detection signal
So11And second detection signal So12One of them.As previously mentioned, according to different application, first detection signal So11And second detection
Signal So12Sizes values it is interchangeable.
One difference of the present embodiment and previous embodiment is the reference signal S that the artificial circuit 150 ' of Fig. 7 exportsref’
The reference signal S exported different from the artificial circuit 150 of Fig. 2ref.In previous embodiment, the reference that artificial circuit 150 exports is believed
Number SrefTo be similar to detect signal S as far as possibleo1；In the present embodiment, the reference signal S of the output of artificial circuit 150 'ref' waveform be situated between
In the first detection signal So11With the second detection signal So12Waveform between, as shown in Figure 7.
Subtraction circuit 152 is equally used for calculating detection signal So1It (can be first detection signal So11Or second detection signal
So12, whether have conductor close to decision according to touch panel 13) and reference signal Sref' difference, with output difference detect signal
Sdiff。
For example, subtraction circuit 152 is directed to the reference signal Sref' and the first detection signal So11Carry out calculus of differences
To generate the first differential sense signal Sdiff1=So11-Sref' (as shown in Figure 7), and it is directed to the reference signal Sref' with it is described
Second detection signal So12Calculus of differences is carried out to generate the second differential sense signal Sdiff2=So12-Sref' (as shown in Figure 7).Root
According to reference signal Sref' wave setting, the first differential sense signal Sdiff1With the second differential sense signal Sdiff2
It with 180 degree phase difference or is reversed.The present embodiment recognizes whether touch panel 13 is in contact using this phase difference
Event.
In a kind of embodiment, the artificial circuit 150 ' of Fig. 8 A is similar to Fig. 3, includes analog detection capacitor Cref_in, simulation from
Electrification holds Cref_s, simulation input resistance Rref_inAnd Simulation scale-up circuit 15B.In addition, the artificial circuit 150 ' of the present embodiment also wraps
The Inductance and Capacitance C containing simulationref_m, simulation Inductance and Capacitance Cref_mThe mutual inductance between detecting electrode 131 to emulate touch panel 13
Capacitor Cm。
In addition, as shown in Figure 8 A, the artificial circuit 150 ' of the present embodiment is also comprising switching switch SWref_1、SWref_2And
SWref_3To cooperate touch panel 13 to operate in from appearance detection pattern or mutual tolerance detection pattern.
From holding under detection pattern, switch switch SWref_2Bypass simulation Inductance and Capacitance Cref_mAnd switch switch SWref_1And
SWref_3Conducting is to connect analog detection capacitor Cref_inAnd simulation self-induction capacitor Cref_sAnd form the artificial circuit 150 such as Fig. 3.
Also that is, from artificial circuit 150 ' under appearance detection pattern according to the analog detection capacitor Cref_in, the simulation self-induction capacitor
Cref_s, the simulation input resistance Rref_inAnd the first reference signal of the Simulation scale-up circuit 15B output (or believe from reference is held
Number).
However, in order to make the waveform of the first reference signal between the first detection signal So11(equally in appearance detection mould certainly
Formula detection) and the second detection signal So12It is described to simulate from electrification between the waveform of (equally being detected in from appearance detection pattern)
Hold Cref_sCapacitance can according to contact caused by detection signal So1Variation select.In a kind of embodiment, the mould
Quasi- self-induction capacitor Cref_sIt is selected as the self-induction capacitor C of the detecting electrode 131 of the touch panel 13S0.92 to 0.98
Times, this is because in general contacting caused detection signal So1Knots modification be about 10%.It will be appreciated that when contact
Caused detection signal So1Knots modification difference when, the range of the multiple can be adjusted.
Subtraction circuit 152 is directed to the detection signal S under holding detection pattern describedo1It is poor to carry out with the first reference signal
Partite transport is calculated and generates differential sense signal Sdiff。
Under mutual tolerance detection pattern, switch switch SWref_1And SWref_3Analog detection capacitor C is bypassed respectivelyref_inAnd simulation is certainly
Electrification holds Cref_sAnd switch switch SWref_2Conducting is to connect simulation Inductance and Capacitance Cref_m, that is, connected shown in Fig. 8 A.Also that is,
Artificial circuit 150 ' is according to the simulation Inductance and Capacitance C under mutual tolerance detection patternref_m, the simulation input resistance Rref_inAnd institute
State Simulation scale-up circuit 15B output the second reference signal (or mutual tolerance reference signal).In the present embodiment, due to generating the first reference
Signal and the circuit unit of the second reference signal are different, and the first reference signal may differ from the second reference signal.
Likewise, in order to make the waveform of the second reference signal between the first detection signal So11It (is equally detected in mutual tolerance
Mode generates) signal S is detected with described secondo12Between the waveform of (equally being generated in mutual tolerance detection pattern), the simulation mutual inductance
Capacitor Cref_mIt is selected as the Inductance and Capacitance C of the detecting electrode 131 of the touch panel 13m0.92 to 0.98 times；Wherein,
The setting of the multiple is it is stated that as above.
Subtraction circuit 152 is directed to the detection signal S under the mutual tolerance detection patterno1It is poor to carry out with the second reference signal
Partite transport is calculated to generate differential sense signal Sdiff。
It will be appreciated that although Fig. 8 A shows that artificial circuit 150 ' includes three switching switch SW simultaneouslyref_1、
SWref_2、SWref_3And analog detection capacitor Cref_in, simulation self-induction capacitor Cref_s, simulation Inductance and Capacitance Cref_mTo cooperate two kinds of moulds
The running of formula, so it is only to illustrate and is not intended to limit the invention explanation.In some embodiments, capacitance touch-control device 1 can
Terminate suspend mode to carry out contact detection from appearance one of detection pattern and mutual tolerance detection pattern, does not need to adopt simultaneously
Use both of which.
For example, when carrying out contact detection using mutual tolerance detection pattern for capacitance touch-control device 1, the artificial circuit of Fig. 8 A
150 ' can not include switching switch SWref_1、SWref_2、SWref_3And analog detection capacitor Cref_in, simulation self-induction capacitor Cref_s。
For example, the artificial circuit 150 ' of Fig. 8 A can not wrap when capacitance touch-control device 1 using contact detection is carried out from appearance detection pattern
The switch SW containing switchingref_1、SWref_2、SWref_3And simulation Inductance and Capacitance Cref_m。
In another embodiment, artificial circuit 150 ' can not be realized with the circuit of Fig. 8 A, but include the flash memory 81 of Fig. 8 B
And digital analog converter (DAC) 83, the digital analog converter 83 is according at least one number stored in the flash memory 81
Data generate the reference signal Sref'.After stored by flash memory 81 is numerical data, therefore flash memory 81 is for example contained in number
In end 16.
As previously mentioned, capacitance touch-control device 1 using from hold detection pattern or mutual tolerance detection pattern at least one
Contact detection is carried out under suspend mode.Therefore, the first digital number being used in from detection pattern is held preferably is stored in flash memory 81
According to and be used in mutual tolerance detection pattern the second numerical data at least one.
First numerical data is in advance according to emulating when touch panel 13 is contacted under appearance detection pattern certainly
The first detection signal S that amplifying circuit 15A is exportedo11And the second detection that the amplifying circuit 15A is exported when not contacted
Signal So12It acquires and is stored in the flash memory 81.Emulation contact mode be, for example, touch panel 13 detecting electrode 131 simultaneously
Join built-in selftest (build-in selftest, BIST) circuit, such as the equivalent capacity electricity of simulated humanbody or finger
Road.It indicates to contact when the built-in self-test circuit connection (such as by switching switch conduction) to detecting electrode 131
Indicated when the built-in self-test circuit not connected (such as passing through switching switch open) to detecting electrode 131 not in contact with,
Use emulation touch operation.
First numerical data is the waveform (S of similar Fig. 7 for making first reference signalref') between described first
Detect signal So11With the second detection signal So12Waveform between.The mode for generating first numerical data for example makes to touch
Control panel 13 operates in from appearance detection pattern and connects and be not connected to built-in self-test circuit sequentially to obtain two groups of numbers respectively
According to (such as sampling S shown in Fig. 7o11、So12The resulting data of waveform), then first number is calculated according to two groups of data
Digital data, such as the data of two groups of corresponding sample points of data are averaged, but it is not limited to this.
Similarly, second numerical data is to be connect under mutual tolerance detection pattern according to the emulation touch panel 13 in advance
Third detection signal (the similar S that the amplifying circuit 15A is exported when touchingo11) and while not contacted amplifying circuit 15A institute
4th detection signal (similar S of outputo12) acquire and be stored in the flash memory 81.Second numerical data is to make described
Waveform (the S of similar Fig. 7 of two reference signalsref') between the third detection signal and it is described 4th detection signal waveform it
Between；Wherein, the mode for generating second numerical data, which is similar to, generates first numerical data, only capacitance touch-control device 1
Operating mode it is different.
When contact detection, digital analog converter 83 is defeated according to first numerical data under the detection pattern from appearance
Out the first reference signal or under the mutual tolerance detection pattern according to second numerical data export the second reference signal.It can be with
It is appreciated that, as sample detection signal So11、So12Sampling frequency be more than 2 times of nyquist frequency (Nyquist
When frequency), then reference signal can be restored according to numerical data.As previously mentioned, flash memory 81 can be stored only in some embodiments
One of first numerical data and second numerical data, therefore the digital analog converter 83 may only generate
One of one reference signal and the second reference signal.
The running of subtraction circuit 152 is directed to the detection signal S under holding detection pattern then as above-mentioned, describedo1With institute
It states the first reference signal and carries out calculus of differences or under the mutual tolerance detection pattern for the detection signal So1With described second
Reference signal carries out calculus of differences to generate differential sense signal Sdiff。
Capacitance touch-control device 1 is also comprising phase reference circuit 156 for generating phase reference signal SprefIt and include detection
Circuit 155 is to the differential sense signal SdiffWith phase reference signal SprefPhase to determine capacitance touch-control device 1
Whether contacted.The detection circuit 155 is electrically connected the subtraction circuit 152 and the phase reference circuit 156.One implements
In example, detection circuit 155 for example can be real with the big device of calculus of differences method (differential operational amplifier)
It is existing.
As shown in Figure 7, it is assumed that subtraction circuit 152 exports the first differential sense signal S when not touchingdiff1And it touches
Subtraction circuit 152 exports the second differential sense signal S when touchingdiff2.First differential sense signal of detection circuit 155
Sdiff1And/or the second differential sense signal Sdiff2With the phase reference signal SprefPhase, to export activation signal
St or non-contact signal Snt.
For example, it is assumed that the phase reference signal SprefIt is selected as and not in contact with differential sense signal (i.e. Sdiff1) have together
Phase.When detection circuit 155 judges differential sense signal SdiffWith phase reference signal SprefWhen substantially same phase (in phase),
Then can determine that be not in contact that event and generating indicates that the touch panel 13 do not contacted not in contact with signal Snt to numerical digit after
End 16.The numerical digit rear end 16 then makes capacitance touch-control device 1 maintain suspend mode or low power consuming mode.When detection circuit 155 judges difference
Detect signal SdiffWith phase reference signal SprefReverse phase (180 degree phase difference), then can determine that the event of being in contact and generate expression
The activation signal St that the touch panel 13 is contacted then wakes up capacitance touch-control device 1 to numerical digit rear end 16, the numerical digit rear end 16.
Capacitance touch-control device 1 is waken up then with the running of previous embodiment, as shown in Fig. 2 to 3 and 5.
In another embodiment, detection circuit 155 only just generates control signal St to number when touch event occurs for judgement
Otherwise position rear end 16 does not generate control signal to wake up capacitance touch-control device 1.
Phase reference circuit 156 can make in a suitable manner, have no specific limitation, as long as phase reference signal can be generated
SprefPhase reference is used as to detection circuit 155.Phase reference signal SprefPhase may be selected to be and Sdiff1、Sdiff2Or
The same phase of a combination thereof, as long as detection circuit 155 can recognize.
In one embodiment, touch panel 13 may include at least one ceases to be busy (null line) to generate glitch
So1_dummy, which, which is arranged to not will receive, contacts and makes capacitance (CS、Cm) be changed, such as shielded layer is set thereon.
In other words, the glitch So1_dummyIt always shows not in contact with detection signal.The phase reference circuit 156 include it is described extremely
A few ceases to be busy, artificial circuit 150 ' and subtraction circuit 152.In more detail, phase reference circuit 156 can be in capacitance touching control
In addition it is arranged other than the practical circuit to detect contact of device 1 and is identical to for generating phase reference signal SprefElectricity
Road.
For example, Fig. 9 A shows the circuit diagram of the phase reference circuit 156 of opposite mutual tolerance detection pattern, it includes driving circuits
11, the Inductance and Capacitance C that ceases to be busy (i.e. empty detecting electrode 131) is formedm, input resistance Rin, amplifying circuit 15A, artificial circuit 150 '
And subtraction circuit 152.Artificial circuit 150 ' include at least Fig. 8 A in respect to mutual tolerance detection pattern component (as previously mentioned,
It may include all components of Fig. 8 A and connection type changed by switching switch).The subtraction circuit 152 is then exported such as Fig. 7
Sdiff1Phase reference signal Spref, as judgement contact or non-contacting benchmark.
For example, Fig. 9 B shows the opposite circuit diagram from the phase reference circuit 156 for holding detection pattern, it includes driving circuits
11, capacitor C is detectedin, the self-induction capacitor C that is formed of ceases to be busy (i.e. empty detecting electrode 131)S, input resistance Rin, it is amplifying circuit 15A, imitative
True circuit 150 ' and subtraction circuit 152.Artificial circuit 150 ' includes at least (same with respect to from the component for holding detection pattern in Fig. 8 A
Reason may include all components of Fig. 8 A and change connection type by switching switch).The subtraction circuit 152 then exports such as Fig. 7
Sdiff1Phase reference signal Spref, as judgement contact or non-contacting benchmark.
In another embodiment, as shown in Figure 9 C, the phase reference circuit 156 includes phase-lock loop (phase
Lock loop) 157, which is used to lock the reference signal S of the output of artificial circuit 150 'ref' phase.
As previously described, because artificial circuit 150 ' is to be set in control chip 100 without being influenced by external conductor, therefore reference signal
Sref' phase be with not in contact with the same phase of differential sense signal.
Similarly, according to different operating modes, the connected capacitor of artificial circuit 150 ' is not identical, therefore exports different ginsengs
Examine signal Sref'.Assuming that artificial circuit 150 ' exports the first reference signal in the case where holding detection pattern certainly and under mutual tolerance detection pattern
The second reference signal is exported, therefore phase-lock loop 157 locks first reference signal under holding detection pattern described
Phase and the phase of second reference signal is locked under the mutual tolerance detection pattern.
In another embodiment, as shown in fig. 9d, the phase reference circuit 156 includes phase-lock loop 157, the phase
Position locked loop 157 is used to lock the phase for being located at the driving signal Sd of the output of driving circuit 11 at driving end.Although driving letter
The differential sense signal S that number Sd is not also influenced by external conductor, however compareddiffDue to being still from by touch panel 13
Signal obtained by and generate phase shift, thus differential sense signal SdiffWith the phase of driving signal Sd can't just with mutually or
Reverse phase.In the present embodiment, detection circuit 155 can detect differential sense signal SdiffPhase difference with the phase of driving signal Sd is
It is no between preset range.For example, be determined as when the phase difference is spent between 0 to 45 it is non-contact and when the phase difference between
135 to 180 degree when be determined as it is non-contact.It will be appreciated that the range of the phase difference is not limited to this, it can be according to factory
Preceding prior measurement is simultaneously set, and has no specific limitation.
In certain embodiments, whether the capacitance touch-control device 1 that the present invention illustrates can be used as detecting merely and be in contact
The triggering key (touch button) of event, and the calculating without position of touch, for example, not comprising in Fig. 3 not be contained in Fig. 7
Component.
The present invention illustrates the switching switch for example, semiconductor switch of embodiment.
In conclusion the whole energy consumption for how reducing capacitance touch-control device is important topic.Therefore, the present invention provides one kind
Capacitance touch-control device (Fig. 7), by the way that artificial circuit is arranged to generate reference signal, the detection of touch panel in control chip
Contact differential signal obtained from signal and the reference signal are subtracted each other afterwards and non-contact differential signal have the phase of 180 degree
Difference can judge contact event according to the phase difference.Meanwhile the judgement of the contact event can be completed by AFE(analog front end), therefore can drop
The electric energy of low digital back-end consumption.
Although the present invention is disclosed by previous examples, it is not intended to limit the invention, belonging to any present invention
In technical field with usual knowledge technical staff, without departing from the spirit and scope of the present invention, when can make it is various more
Dynamic and modification.Therefore protection scope of the present invention is subject to the range defined depending on appended claims.
Claims (20)
1. a kind of capacitance touch-control device, which includes:
Touch panel, the touch panel include detecting electrode；
Amplifying circuit, the amplifying circuit couple the detecting electrode, for exporting the when the detecting electrode does not incude contact
One detection signal and the second detection of output signal when the detecting electrode incudes and contacts；
Artificial circuit, the artificial circuit is for exporting reference signal；And
Subtraction circuit, the subtraction circuit are used to carry out calculus of differences for the reference signal and the first detection signal to produce
Raw first differential sense signal, and calculus of differences is carried out for the reference signal and the second detection signal to generate second
Differential sense signal, wherein first differential sense signal and the second differential sense signal reverse phase.
2. capacitance touch-control device according to claim 1, wherein the waveform of the reference signal is between first detection
Between signal and the waveform of the second detection signal.
3. capacitance touch-control device according to claim 1, wherein the artificial circuit includes flash memory and digital-to-analogue conversion
Device, the digital analog converter generate the reference signal according to the numerical data that the flash memory stores up.
4. capacitance touch-control device according to claim 1, wherein the artificial circuit includes analog detection capacitor, simulates certainly
Electrification holds, simulation input resistance and Simulation scale-up circuit, the simulation self-induction capacitor are the detection electricity of the touch panel
0.92~0.98 times of the self-induction capacitor of pole.
5. capacitance touch-control device according to claim 1, wherein the artificial circuit is defeated comprising simulation Inductance and Capacitance, simulation
Enter resistance and Simulation scale-up circuit, the simulation Inductance and Capacitance is the Inductance and Capacitance of the detecting electrode of the touch panel
0.92~0.98 times.
6. capacitance touch-control device according to claim 1, also includes
Phase reference circuit, the phase reference circuit is for generating phase reference signal；And
Detection circuit, the detection circuit are electrically connected the subtraction circuit and the phase reference circuit, for more described the
The phase of one differential sense signal or second differential sense signal and the phase reference signal, with export activation signal or
Non-contact signal.
7. capacitance touch-control device according to claim 6, wherein the phase reference circuit includes phase-lock loop, it should
Phase-lock loop is used to lock the phase of the reference signal of the artificial circuit output.
8. capacitance touch-control device according to claim 6, wherein the phase reference circuit includes phase-lock loop, it should
Phase-lock loop is used to lock the phase of the driving signal of driving circuit output.
9. a kind of capacitance touch-control device, which includes:
Touch panel, the touch panel include detecting electrode, for operating in from appearance detection pattern or mutual tolerance detection pattern；
Detect capacitor, the detection capacitor be used for it is described from hold detection pattern couple the detecting electrode signal input part and in
The mutual tolerance detection pattern does not couple the signal input part of the detecting electrode；
Input resistance, the input resistance couple the signal output end of the detecting electrode；
Amplifying circuit, the amplifying circuit couple the input resistance, and for exporting detection signal；
Artificial circuit, the artificial circuit include analog detection capacitor, simulation self-induction capacitor, simulation Inductance and Capacitance, simulation input electricity
Resistance and Simulation scale-up circuit, for it is described under holding detection pattern according to the analog detection capacitor, the simulation from electrification
Appearance, the simulation input resistance and first reference signal of Simulation scale-up circuit output or the root under the mutual tolerance detection pattern
According to the simulation Inductance and Capacitance, the simulation input resistance and second reference signal of Simulation scale-up circuit output；And
Subtraction circuit, the subtraction circuit are used to be directed to the detection signal and first reference under holding detection pattern described
Signal carries out calculus of differences or carries out under the mutual tolerance detection pattern for the detection signal and second reference signal
Calculus of differences is to generate differential sense signal.
10. capacitance touch-control device according to claim 9, wherein institute of the simulation self-induction capacitor for the touch panel
0.92~0.98 times for stating the self-induction capacitor of detecting electrode.
11. capacitance touch-control device according to claim 9, wherein institute of the simulation Inductance and Capacitance for the touch panel
0.92~0.98 times for stating the Inductance and Capacitance of detecting electrode.
12. capacitance touch-control device according to claim 9, wherein the artificial circuit also includes switching switch, the switching
Switch is for connecting or bypassing the analog detection capacitor, the simulation self-induction capacitor and the simulation Inductance and Capacitance.
13. capacitance touch-control device according to claim 9, also includes
Phase reference circuit, the phase reference circuit is for generating phase reference signal；And
Detection circuit, which is used for the phase of the differential sense signal and the phase reference signal, with defeated
Indicate activation signal that the touch panel is contacted out or indicate that the touch panel do not contacted not in contact with signal.
14. capacitance touch-control device according to claim 13, wherein the phase reference circuit includes phase-lock loop,
The phase-lock loop is used to lock first reference signal of the artificial circuit output under holding detection pattern described
Phase or locked under the mutual tolerance detection pattern artificial circuit output second reference signal phase.
15. capacitance touch-control device according to claim 13, wherein the phase reference circuit includes phase-lock loop,
The phase-lock loop is used to lock the phase of the driving signal of driving circuit output.
16. a kind of capacitance touch-control device, which includes:
Touch panel, the touch panel include detecting electrode；
Input resistance, the input resistance couple the signal output end of the detecting electrode；
Amplifying circuit, the amplifying circuit couple the input resistance, and for exporting detection signal；
Flash memory, the flash memory store at least one numerical data in advance；
Digital analog converter, the digital analog converter are used to export at least one ginseng according at least one described numerical data
Examine signal；And
Subtraction circuit, the subtraction circuit are used to carry out calculus of differences for the detection signal and at least one described reference signal
To generate differential sense signal.
17. capacitance touch-control device according to claim 16, wherein
At least one described numerical data includes the first numerical data and the second numerical data,
The digital analog converter is used to believed under holding detection pattern according to the first reference of first numerical data output
Number, and for exporting the second reference signal according to second numerical data under mutual tolerance detection pattern,
First numerical data is in advance according to emulating when the touch panel is contacted under the detection pattern from appearance
First detection signal that amplifying circuit is exported and the second detection signal that while not contacted amplifying circuit is exported acquire
And it is stored in the flash memory,
First numerical data is to make the waveform of first reference signal between the first detection signal and described second
Between the waveform for detecting signal,
Second numerical data is in advance according to emulating when the touch panel is contacted under the mutual tolerance detection pattern
The third that amplifying circuit is exported the 4th detection signal that the amplifying circuit is exported when detecting signal and not contacted acquires
And it is stored in the flash memory, and
Second numerical data is to make the waveform of second reference signal between third detection signal and the described 4th
Between the waveform for detecting signal.
18. capacitance touch-control device according to claim 17, also includes
Phase reference circuit, the phase reference circuit is for generating phase reference signal；And
Detection circuit, which is used for the phase of the differential sense signal and the phase reference signal, with defeated
Indicate activation signal that the touch panel is contacted out or indicate that the touch panel do not contacted not in contact with signal.
19. capacitance touch-control device according to claim 18, wherein the phase reference circuit includes phase-lock loop,
The phase-lock loop is used to lock first ginseng of the digital analog converter output under holding detection pattern described
It examines the phase of signal and locks the second reference letter of the digital analog converter output under the mutual tolerance detection pattern
Number phase.
20. capacitance touch-control device according to claim 18, wherein the phase reference circuit includes phase-lock loop,
The phase-lock loop is used to lock the phase of the driving signal of driving circuit output.
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| US15/635,010 | 2017-06-27 | ||
| US15/635,010 US10831304B2 (en) | 2015-03-26 | 2017-06-27 | Control chip for capacitive touch device with high sensitivity and low power consumption |
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