CN108287638A - Touch detection circuit and its touch detecting method - Google Patents
Touch detection circuit and its touch detecting method Download PDFInfo
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- CN108287638A CN108287638A CN201810316822.9A CN201810316822A CN108287638A CN 108287638 A CN108287638 A CN 108287638A CN 201810316822 A CN201810316822 A CN 201810316822A CN 108287638 A CN108287638 A CN 108287638A
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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
- G06F3/0416—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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
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- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
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- Electronic Switches (AREA)
Abstract
The invention discloses a kind of touch detection circuits, including power module, induction detection unit and controller module；Power module is to power supply；The signal of induction detection unit detection touch sensible part upload simultaneously uploads controller module；Controller module is detected touch action according to the signal of upload.The invention also discloses the touch detecting methods of the touch detection circuit, and the influence for the frequency of oscillation that direct-to-ground capacitance exports oscillating circuit is formed by by detecting human body touch touch sensible part, complete touch detection.The touch action that the touch detection circuit and its touch detecting method of the present invention can touch induction part precisely detect and identify, and touch sensible part can be adjusted and extend as needed, use scope and the flexibility for considerably increasing the present invention, greatly improve the usage experience of user.
Description
Technical field
Present invention relates particularly to a kind of touch detection circuit and its touch detecting methods.
Background technology
With the development and the improvement of people's living standards of economic technology, touch operation has become people's daily life
In essential part, endless facility is brought to the production and life of people.
The core of touch operation is to be detected the touch action of people.Existing touch detection circuit and corresponding
There are many detection methods, as touch sensible part incudes the touch of user, or the electricity using human body using capacitance type sensor
Hold induction, the methods of the variable quantity for converting the variation of capacitance to voltage, charge and charge cycle judges.But no matter
Which kind of touch detection mode, once the circuit of touch detection determines, induction receiving portion cannot as a part for circuit
It is adjusted and extends.To extend its touch sensible position length, change touch size, position, or according to
Induction part is replaced with the conductive body (for example carrying out Touching controlling lamp using key) of itself needs by family demand, needs to join circuit
Number is readjusted, or even can not be worked.When induction part reaches certain length or area, due to the variation of external interference
And uncertainty, the sensitivity for receiving touch sensible on the one hand can be caused to decline, touch signal can not accurately be identified,
On the other hand the electrical interference received can be then made to increase so that the stability of touch sensible reduces, in this way its touch detection
Method has certain limitation, cannot well adapt to user demand.
Invention content
One of the objects of the present invention is to provide a kind of touch detection precision height, and can adjust suitable for touch sensible part
With the touch detection circuit of spread scenarios.
The second object of the present invention is to provide a kind of touch detecting method of the touch detection circuit.
This touch detection circuit provided by the invention, including power module, induction detection unit and controller module；Electricity
Source module is powered to the touch detection circuit；Controller module, induction detection unit and touch sensible part are sequentially connected in series；Sense
Detection unit is answered to be connect with touch sensible part, the data-signal for detecting the upload of touch sensible part simultaneously uploads controller mould
Block；Controller module is detected the touch action of touch sensible part according to the detection signal that induction detection unit uploads.
The induction detection unit is oscillating circuit.
The induction detection unit further includes input filter circuit；The input terminal string of input filter circuit and oscillating circuit
Connection, for filtering out the electrical interference signal being partly coupled into from touch sensible.
The induction detection unit further includes input protection circuit；Input protection circuit be serially connected in input filter circuit with
Between oscillating circuit, for carrying out electric protection to oscillating circuit.
The oscillating circuit is included the oscillating circuit being made of analog circuit device and is shaken using what integrated chip was constituted
Swing circuit.
The oscillating circuit being made of analog circuit device is the RC oscillating circuits built using circuit components, adopted
The LC oscillating circuits built with circuit components, the RL oscillating circuits built using circuit components are taken using circuit components
The RLC oscillating circuits built, the RC oscillating circuits integrated by circuit chip, the LC oscillating circuits integrated by circuit chip, by circuit
The RL oscillating circuits of integrated chip and the RLC oscillating circuits integrated by circuit chip, the voltage controlled oscillation built by circuit components
Circuit, the square-wave generator circuit built by circuit components, the crystal oscillator square-wave oscillator circuit built by circuit components.
Described uses the oscillating circuit that integrated chip is constituted for using the oscillating circuit of voltage controlled oscillation module composition, use
The oscillating circuit that square-wave generator is constituted or the oscillating circuit constituted using integrated oscillation chip.
The touch sensible part is several conductiving points, and is connected by electric conductor between each conductiving point；It uses
Person directly touches any one conductiving point by human body or arbitrary electric conductor or connects the arbitrary portion of the electric conductor of conductiving point
Touch sensible can be achieved.
The invention also discloses the touch detecting methods of the touch detection circuit, by detecting human body touch touch sensible
Part is formed by the influence for the frequency of oscillation that direct-to-ground capacitance exports oscillating circuit, to complete the touch detection circuit
Touch detection.
The touch detecting method specially uses following steps to carry out touch detection：
S1. the square wave frequency of oscillating circuit output is sampled；
S2. the frequency of maximum harmonic wave is interfered in the sample sequence that obtaining step S1 is obtained；
S3. the square wave frequency that the frequency for using step S2 to obtain exports oscillating circuit samples；
S4. the step S3 sample sequences obtained are normalized into desired value, to allow the sequence of sampling near desired value
Shake；
S5. touch detection is carried out to the sample sequence that step S4 is obtained, to complete the process of touch detection.
The frequency that maximum harmonic wave is interfered in acquisition sample sequence described in step S2, is specially obtained using following steps
It takes：
A. controller module is with sampling period TsThe square wave frequency of sample oscillations circuit output, to form the square wave of sampling
Frequency x (n)；
B. FFT operations are carried out to the square wave frequency x (n) of sampling and obtains sequence X (k)；
C. amplitude spectrum positive correlation value A (k) is acquired according to the obtained sequence Xs (k) of step B；
D. the maximum value outside A (0) item is removed in the amplitude spectrum positive correlation value A (k) that obtaining step C is obtained；
E. the fundamental frequency f corresponding to maximum value that obtaining step D is obtaineda, and with fundamental frequency faFor sample frequency.
The sample sequence of acquisition is normalized into desired value described in step S4, specially following steps is used to carry out normalizing
Change：
A. the consequent difference value of sample sequence y (m) is calculated；
B. the consequent difference value obtained according to step a, after calculating accumulation backward difference maximum value and the accumulation in m sampling
To difference minimum value；
C. it judgment step b is obtained accumulation backward difference maximum value and accumulates the difference of backward difference minimum value and sets in advance
The size of fixed threshold value；
D. the average value for the sample sequence y (m) that step a is obtained is sought；
E. normalizing weighted value w=desired values/average value is calculated；
F. each single item of the obtained sample sequence y (m) of step a is multiplied by normalizing weighted value, to return sample sequence
One changes to desired value.
Touch detection is carried out to sample sequence described in step S5, specially following steps is used to carry out touch detection：
(1) difference between the obtained normalized desired values of obtaining step S4 and the peak value of the doubtful touch waveform detected
Value D；
(2) it obtains in set period of time Δ t, the rising of the drop-out value P1 and rising edge of the doubtful failing edge for touching waveform
Value P2；
(3) the time point t2 at the end of the time point t1 and rising edge when the doubtful failing edge for touching waveform starts is obtained,
And the area S1 surrounded between doubtful touch waveform and normalized desired value in t1~t2 periods；
(4) it obtains in t1~t2 periods, normalized desired value and doubtful the surrounded area S2 of peak value for touching waveform；
(5) it calculates and touches area accounting
(6) by D, P1, P2, | t2-t1|, the value of S1 and Ps be compared with the threshold value being previously set, to judge to detect
To doubtful touch waveform whether be effective touch signal.
This touch detection circuit and its touch detecting method provided by the invention touch the signal of part by that will incude
It is converted to the output signal of oscillating circuit and is detected, so that the touch detection circuit of the present invention can touch induction
Partial touch action precisely detect and identify, and the touch sensible part of the present invention can be adjusted as needed and
Extension considerably increases use scope and the flexibility of the present invention, greatly improves the usage experience of user.
Description of the drawings
Fig. 1 is the functional block diagram of the touch detection circuit of the present invention.
Fig. 2 is the functional block diagram of the induction detection unit of the present invention.
Fig. 3 is a kind of circuit diagram of embodiment of the induction detection unit of the present invention.
Fig. 4 is circuit diagram when oscillating circuit of the invention uses RC oscillating circuits.
Fig. 5 is circuit diagram when oscillating circuit of the invention uses LC oscillating circuits.
Fig. 6 is circuit diagram when oscillating circuit of the invention uses voltage controlled oscillation module.
Fig. 7 is circuit diagram when oscillating circuit of the invention uses square-wave generator.
Fig. 8 is the oscillating circuit of the present invention using the circuit diagram integrated when vibrating chip.
Fig. 9 is that the induction of the present invention touches the schematic diagram of part.
Figure 10 is flow chart of the method for the present invention.
Specific implementation mode
It is as shown in Figure 1 the functional block diagram of the touch detection circuit of the present invention：This touch detection provided by the invention
Circuit, including power module, induction detection unit and controller module；Power module is powered to the touch detection circuit；Control
Device module, induction detection unit and touch sensible part processed are sequentially connected in series；Induction detection unit is connect with touch sensible part, is used
In the data-signal for detecting the upload of touch sensible part and upload controller module；Controller module is according in induction detection unit
The detection signal of biography is detected the touch action of touch sensible part.
It is illustrated in figure 2 the functional block diagram of the induction detection unit of the present invention：Incude detection unit and use oscillating circuit,
Input filter circuit and input protection circuit are also serially connected with before oscillating circuit；Input filter circuit is felt for filtering out from touch
The electrical interference signal that should be partly coupled into；Input protection circuit is used to carry out electric protection to oscillating circuit.
It is illustrated in figure 3 a kind of circuit diagram of embodiment of the induction detection unit of the present invention：Input filter circuit
Inductance L1 (can also be used other filter circuits such as magnetic bead) is used in this embodiment to filter out the major part of induction touch unit
High-frequency interferencing signal is coupled into the extraneous electrical interference of oscillating circuit by incuding touch unit；Input protection circuit is using guarantor
Diode D1 and D2 are protected, two diodes are for avoiding electrostatic damage oscillating circuit.And the capacitance CY in figure is then when human body touches
Touch or when human body by electric conductor indirectly touch induction touch unit when, generated equivalent electricity between human body and the earth
Hold, the addition of the equivalent capacity is so that the capacitance of the input terminal of oscillating circuit changes, to influence the defeated of oscillating circuit
Go out the frequency of square wave, to which human body to be converted to the variation of electric signal for incuding the touch action of touch unit.And controller
Module is then by detecting the variation of the electric signal, to reach the touch detection for touching part to induction.
The core devices of the touch sensing unit of the present invention are oscillating circuit.Oscillating circuit includes by analog circuit device structure
At oscillating circuit and using integrated chip constitute oscillating circuit.
The oscillating circuit being made of analog circuit device is the RC oscillating circuits built using circuit components, using circuit
LC oscillating circuits that component is built, the RL oscillating circuits built using circuit components, the RLC built using circuit components
Oscillating circuit, the LC oscillating circuits integrated by circuit chip, is integrated by circuit chip the RC oscillating circuits integrated by circuit chip
RL oscillating circuits and integrated by circuit chip RLC oscillating circuits, built by circuit components Voltage-Controlled oscillation circuit, by
Square-wave generator circuit that circuit components are built, the crystal oscillator square-wave oscillator circuit built by circuit components；The use
The definition that circuit components are built is：Not using the circuit that is made of integrated chip, but designer using resistance, capacitance,
The independent component such as inductance, integrated transporting discharging is voluntarily built or component and the circuit that is formed.
The oscillating circuit that integrated chip is constituted is used to be sent out using the oscillating circuit of voltage controlled oscillation module composition, using square wave
The oscillating circuit that raw device is constituted or the oscillating circuit constituted using integrated oscillation chip
The type of oscillating circuit is more, will enumerate the exemplary of several oscillating circuits below：
It is illustrated in figure 4 circuit diagram of the oscillating circuit of the present invention using RC oscillating circuits when：In this embodiment,
Oscillating circuit uses the RC oscillating circuits being made of amplifier U1 and resistance R, capacitance C；In the circuit diagram, resistance R2 and capacitance C1
And resistance R4 and capacitance C2 constitute series-parallel frequency-selective network, form negative-feedback branch by R3 and R5, output voltage Vout passes through
Frequency-selective network positive feedback partial pressure input amplifier U1 positive feedbacks end, Vout input U1 negative-feedbacks end by introducing negative-feedback branch, from
And reach the output sinusoidal waveform of stable amplitude and frequency.If when R2=R4=R, C1=C2=C, which is not touching
When touching signal, the square wave frequency of output end (output end of amplifier U1) outputAnd when there is touch signal,
Equivalent capacity is equivalent in parallel with capacitance C2 at this time, and the capacitance of the oscillating capacitance of oscillating circuit is changed at this time, therefore this
When the square wave frequency that exports changed, the frequency of the square wave of output is changed.
It is illustrated in figure 5 circuit diagram of the oscillating circuit of the present invention using LC oscillating circuits when：In this embodiment,
Oscillating circuit uses triode VT, the LC oscillating circuits that capacitance C, inductance L and resistance R are constituted, wherein core frequency of oscillation by L,
C3, C determine that frequency is adjusted mainly by C, and C3 is trimmer, and active component function provides rational static work for oscillator
Make a little, to open oscillator and shake and stability provides safeguard, C2 is electronic feedback part, ensures the stabilization of oscillation amplitude.The oscillation
Circuit is not when having touch signal, the square wave frequency of output end (signal OUT in figure) output
And when there is touch signal, equivalent capacity is equivalent to load between A points and earth signal at this time, at this time the oscillation electricity of oscillating circuit
The capacitance of appearance is changed, and the frequency of the square wave exported at this time is then changed.
It is illustrated in figure 6 circuit diagram of the oscillating circuit of the present invention using voltage controlled oscillation module when：In the embodiment
In, using voltage controlled oscillation (VCO) module composition oscillating circuit；Wherein voltage controlled oscillation (VCO) module is using the mould of function containing VCO
The chip (the VCO funtion parts in the phase-locked loop PLL logic chips of such as HEF4046BPN) of block realizes that 6 feet of chip are direct
Connection induction touches part, and 7 feet are connect by oscillating capacitance C1 with 6 feet, and 11 feet connect oscillation resistance R1, and 12 feet connect R2, should
The other function modules of chip can not use, it is only necessary to provide power supply for chip and VCO modules may make to work；When the oscillating circuit exists
When not having touch signal, the square wave frequency of output end (4 feet of figure chips) output can be obtained according to the table in chip handbook
, according to handbook, its value is related to R1 and C1, and when there is touch signal, equivalent capacity is equivalent to load the 6 of chip at this time
Between foot and earth signal, the capacitance of the oscillating capacitance of oscillating circuit is changed at this time, and the frequency of the square wave exported at this time is then
Changed.
It is illustrated in figure 7 circuit diagram of the oscillating circuit of the present invention using square-wave generator when：In this embodiment,
Oscillating circuit uses the oscillating circuit that Schmidt's square-wave generator is constituted；The input terminal (2 foot) of Schmidt trigger passes through oscillation
Capacitance CT connection power supply signal VCC, simultaneously also by oscillation resistance R1 connections output end (4 foot), wherein CT serves as charge and discharge electricity
Hold, R1 provides charging and discharging circuit, and U1A provides oscillating condition, and there are two threshold values for Schmidt trigger input voltage, can disappear
Except input terminal is in the shaking interference of Near Threshold so that output is more stablized, when the oscillating circuit is not when having touch signal,
The square wave frequency of output end (2 feet of trigger in figure) output is related to R1 and C1, concrete numerical value can according to the value of R1 and C1 and
The threshold value of Schmidt trigger chip handbook obtains；And when there is touch signal, equivalent capacity is equivalent to load and is triggering at this time
Between 2 feet and ground and VCC of device, the capacitance of the oscillating capacitance of oscillating circuit is changed at this time, the square wave exported at this time
Frequency is then changed.
It is illustrated in figure 8 circuit diagram of the oscillating circuit of the present invention using integrated oscillation chip when：In the embodiment
In, oscillating circuit is constituted using integrated oscillation chip (such as MIC1557)；1 foot and 2 feet of chip are all connected with power supply signal
VCC, the 3 feet ground connection of chip, 4 feet of chip are by 5 feet of output pin of oscillation resistance R1 connection chips, while 4 feet of chip
It is grounded also by oscillating capacitance CT；When the oscillating circuit is not when having touch signal, output end (5 feet of figure chips) exports
Square wave frequency beWherein k1Value can be obtained from the databook of chip；And working as has touch signal
When, equivalent capacity is equivalent to load between 4 feet and ground of chip at this time, and the capacitance of the oscillating capacitance of oscillating circuit occurs at this time
Change, the frequency of the square wave exported at this time is then changed.
The induction for being illustrated in figure 9 the present invention touches the schematic diagram of part：Touch sensible part is several conductiving points, and
It is connected by electric conductor (black heavy line in figure) between each conductiving point；User is directly touched by human body or arbitrary electric conductor
Touch sensible can be achieved in the arbitrary portion touched any one conductiving point or connect the electric conductor of conductiving point.
It is flow chart of the method for the present invention as shown in Figure 10：The touch detection side of touch detection circuit disclosed by the invention
Method is formed by the shadow for the frequency of oscillation that direct-to-ground capacitance exports oscillating circuit by detecting human body touch touch sensible part
It rings, to complete the touch detection of the touch detection circuit.
Touch detecting method then uses following steps to carry out touch detection：
S1. the square wave frequency of oscillating circuit output is sampled；
S2. the frequency of maximum harmonic wave is interfered in the sample sequence that obtaining step S1 is obtained；Specially use following steps
It obtains：
A. controller module is with sampling period TsThe square wave frequency of sample oscillations circuit output, to form the square wave of sampling
Frequency x (n)；
B. FFT operations are carried out to the square wave frequency x (n) of sampling and obtains sequence X (k)；
C. amplitude spectrum positive correlation value A (k) is acquired according to the obtained sequence Xs (k) of step B；
D. the maximum value outside A (0) item is removed in the amplitude spectrum positive correlation value A (k) that obtaining step C is obtained；
E. the fundamental frequency f corresponding to maximum value that obtaining step D is obtaineda, and with fundamental frequency faFor sample frequency；
S3. the square wave frequency that the frequency for using step S2 to obtain exports oscillating circuit samples；
S4. the step S3 sample sequences obtained are normalized into desired value, to allow the sequence of sampling near desired value
Shake；Specially it is normalized using following steps：
A. the consequent difference value of sample sequence y (m) is calculated；
B. the consequent difference value obtained according to step a, after calculating accumulation backward difference maximum value and the accumulation in m sampling
To difference minimum value；
C. it judgment step b is obtained accumulation backward difference maximum value and accumulates the difference of backward difference minimum value and sets in advance
The size of fixed threshold value；
D. the average value for the sample sequence y (m) that step a is obtained is sought；
E. normalizing weighted value w=desired values/average value is calculated；
F. each single item of the obtained sample sequence y (m) of step a is multiplied by normalizing weighted value, to return sample sequence
One changes to desired value；
S5. touch detection is carried out to the sample sequence that step S4 is obtained, to complete the process of touch detection；Specially adopt
Touch detection is carried out with following steps：
(1) difference between the obtained normalized desired values of obtaining step S4 and the peak value of the doubtful touch waveform detected
Value D；
(2) it obtains in set period of time Δ t, the rising of the drop-out value P1 and rising edge of the doubtful failing edge for touching waveform
Value P2；
(3) the time point t2 at the end of the time point t1 and rising edge when the doubtful failing edge for touching waveform starts is obtained,
And the area S1 surrounded between doubtful touch waveform and normalized desired value in t1~t2 periods；
(4) it obtains in t1~t2 periods, normalized desired value and doubtful the surrounded area S2 of peak value for touching waveform；
(5) it calculates and touches area accounting
(6) by D, P1, P2, | t2-t1|, the value of S1 and Ps be compared with the threshold value being previously set, to judge to detect
To doubtful touch waveform whether be effective touch signal；
Specially：Threshold value D is previously setmin, P1min, P2min, | t2-t1|min, S1minAnd PsminIf D>Dmin、P1>
P1min, P2>P2min, | t2-t1|>|t2-t1|min, S1>S1minAnd Ps>Psmin, then assert that the doubtful touch waveform detected is to have
Otherwise the touch signal of effect assert that the doubtful touch waveform is invalid touch signal.
Claims (13)
1. a kind of touch detection circuit, it is characterised in that including power module, induction detection unit and controller module；Power supply mould
Block is powered to the touch detection circuit；Controller module, induction detection unit and touch sensible part are sequentially connected in series；Induction inspection
It surveys unit to connect with touch sensible part, the data-signal for detecting the upload of touch sensible part simultaneously uploads controller module；
Controller module is detected the touch action of touch sensible part according to the detection signal that induction detection unit uploads.
2. touch detection circuit according to claim 1, it is characterised in that the induction detection unit is oscillating circuit.
3. touch detection circuit according to claim 1, it is characterised in that the induction detection unit further includes input
Filter circuit；Input filter circuit connects with the input terminal of oscillating circuit, is partly coupled into from touch sensible for filtering out
Electrical interference signal.
4. touch detection circuit according to claim 3, it is characterised in that the induction detection unit further includes input
Protect circuit；Input protection circuit is serially connected between input filter circuit and oscillating circuit, for carrying out electric guarantor to oscillating circuit
Shield.
5. the touch detection circuit according to one of claim 2~4, it is characterised in that the oscillating circuit includes by mould
The oscillating circuit that quasi- circuit devcie is constituted and the oscillating circuit constituted using integrated chip.
6. touch detection circuit according to claim 5, it is characterised in that described to be shaken by what analog circuit device was constituted
It is the RC oscillating circuits built using circuit components, the LC oscillating circuits built using circuit components, using electricity to swing circuit
RL oscillating circuits that road component is built, the RLC oscillating circuits built using circuit components are shaken by the RC that circuit chip integrates
It swings circuit, the LC oscillating circuits that are integrated by circuit chip, the RL oscillating circuits integrated by circuit chip and integrated by circuit chip
RLC oscillating circuits, the Voltage-Controlled oscillation circuit built by circuit components, the square-wave generator electricity built by circuit components
Road, the crystal oscillator square-wave oscillator circuit built by circuit components.
7. touch detection circuit according to claim 6, it is characterised in that the oscillation constituted using integrated chip
Circuit is the oscillating circuit using voltage controlled oscillation module composition, the oscillating circuit using square-wave generator composition or is shaken using integrated
Swing the oscillating circuit of chip composition.
8. the touch detection circuit according to one of claim 2~4, it is characterised in that if the touch sensible part is
Dry conductiving point, and connected by electric conductor between each conductiving point；User is directly touched by human body or arbitrary electric conductor
Touch sensible can be achieved in the arbitrary portion of the electric conductor of any one conductiving point or connection conductiving point.
9. the touch detecting method of the touch detection circuit described in a kind of one of claim 1~9, it is characterised in that pass through detection
Human body touch touch sensible part is formed by the influence for the frequency of oscillation that direct-to-ground capacitance exports oscillating circuit, to complete
State the touch detection of touch detection circuit.
10. touch detecting method according to claim 9, it is characterised in that specially carry out touch inspection using following steps
It surveys：
S1. the square wave frequency of oscillating circuit output is sampled；
S2. the frequency of maximum harmonic wave is interfered in the sample sequence that obtaining step S1 is obtained；
S3. the square wave frequency that the frequency for using step S2 to obtain exports oscillating circuit samples；
S4. the step S3 sample sequences obtained are normalized into desired value, to allow the sequence of sampling to be shaken near desired value；
S5. touch detection is carried out to the sample sequence that step S4 is obtained, to complete the process of touch detection.
11. touch detecting method according to claim 10, it is characterised in that in the acquisition sample sequence described in step S2
The frequency of maximum harmonic wave is interfered, specially following steps is used to obtain：
A. controller module is with sampling period TsThe square wave frequency of sample oscillations circuit output, to form the square wave frequency x of sampling
(n)；
B. FFT operations are carried out to the square wave frequency x (n) of sampling and obtains sequence X (k)；
C. amplitude spectrum positive correlation value A (k) is acquired according to the obtained sequence Xs (k) of step B；
D. the maximum value outside A (0) item is removed in the amplitude spectrum positive correlation value A (k) that obtaining step C is obtained；
E. the fundamental frequency f corresponding to maximum value that obtaining step D is obtaineda, and with fundamental frequency faFor sample frequency.
12. touch detecting method according to claim 10, it is characterised in that the sampling sequence by acquisition described in step S4
Row normalization is specially normalized using following steps to desired value：
A. the consequent difference value of sample sequence y (m) is calculated；
B. the consequent difference value obtained according to step a, to difference after calculating the accumulation backward difference maximum value in m sampling and accumulating
Divide minimum value；
C. it judgment step b is obtained accumulation backward difference maximum value and accumulates the difference of backward difference minimum value and is previously set
The size of threshold value；
D. the average value for the sample sequence y (m) that step a is obtained is sought；
E. normalizing weighted value w=desired values/average value is calculated；
F. each single item of the obtained sample sequence y (m) of step a is multiplied by normalizing weighted value, to normalize sample sequence
To desired value.
13. touch detecting method according to claim 10, it is characterised in that carried out to sample sequence described in step S5
Touch detection specially uses following steps to carry out touch detection：
(1) the difference D between the obtained normalized desired values of obtaining step S4 and the peak value of the doubtful touch waveform detected；
(2) it obtains in set period of time Δ t, the rising value of the drop-out value P1 and rising edge of the doubtful failing edge for touching waveform
P2；
(3) the time point t2 at the end of the time point t1 and rising edge when the doubtful failing edge for touching waveform starts is obtained, and
It is doubtful in t1~t2 periods to touch the area S1 surrounded between waveform and normalized desired value；
(4) it obtains in t1~t2 periods, normalized desired value and doubtful the surrounded area S2 of peak value for touching waveform；
(5) it calculates and touches area accounting
(6) by D, P1, P2, | t2-t1|, the value of S1 and Ps be compared with the threshold value being previously set, to judging to detect
Whether doubtful touch waveform is effective touch signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810316822.9A CN108287638B (en) | 2018-04-10 | 2018-04-10 | Touch detection circuit and touch detection method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810316822.9A CN108287638B (en) | 2018-04-10 | 2018-04-10 | Touch detection circuit and touch detection method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108287638A true CN108287638A (en) | 2018-07-17 |
| CN108287638B CN108287638B (en) | 2023-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810316822.9A Active CN108287638B (en) | 2018-04-10 | 2018-04-10 | Touch detection circuit and touch detection method thereof |
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| CN (1) | CN108287638B (en) |
Cited By (4)
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| CN109117020A (en) * | 2018-07-19 | 2019-01-01 | 北京集创北方科技股份有限公司 | Localization method and device, storage medium, the electronic device of position of touch |
| CN112181213A (en) * | 2019-07-03 | 2021-01-05 | 三星电机株式会社 | Sensing device with fingerprint sensor and method for detecting touch |
| CN113137980A (en) * | 2021-04-02 | 2021-07-20 | 屈新苗 | Variable narrow-band differential capacitance sensing circuit, sensing method and application thereof |
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| CN101419522A (en) * | 2008-11-28 | 2009-04-29 | 深圳市汇顶科技有限公司 | Capacitance touch detection device and detection method thereof |
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| CN113137980A (en) * | 2021-04-02 | 2021-07-20 | 屈新苗 | Variable narrow-band differential capacitance sensing circuit, sensing method and application thereof |
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| CN108287638B (en) | 2023-08-11 |
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