CN102467305A - Electronic device with capacitive induction circuit carrying phase information, and method for electronic device - Google Patents
Electronic device with capacitive induction circuit carrying phase information, and method for electronic device Download PDFInfo
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Abstract
The invention discloses an electronic device, which comprises a touch panel, a detector and a sensor, wherein the detector is used for transmitting a driving signal which has a default cycle and additional phase information; the touch panel comprises a plurality of induction units; when the induction units are touched, a sensing signal is generated; the sensor is used for receiving the sensing signal and determining a detection value according to the default cycle and phase information of the driving signal; a signal taking-out device of the sensor is used for generating a demodulation signal according to the pulse widths of the default cycle and phase information of the driving signal, and demodulating the sensing signal according to the demodulation signal to determine the detection value; and a phase detector of the sensor is used for starting the signal taking-out device when the amplitude of the sensing signal is greater than a default value. Without phase compensation, the electronic device can process an analog signal by using the demodulation signal to determine a touch position.
Description
Technical field
The present invention relates to a kind of method that has the electronic installation of contact panel and handle this electronic installation information, refer to especially a kind of do not need phase compensation can utilize the demodulation signal processing simulating signal with the decision position of touch electronic installation and method.
Background technology
The consideration of carrying for ease and using, the contact panel that the user can directly touch (touch-panel) becomes the direction of the market development gradually.The LCD that is used for personal digital assistant combines with contact panel to omit button or function button usually.Contact panel produces electric signal through touch-control and is used to control the image demonstration of LCD and realizes function control.
See also Fig. 1, Fig. 1 is the synoptic diagram that tradition has the electronic installation 10 of contact panel 11.The contact panel 11 of electronic installation 10 has position of touch and the power that a sensing unit array (sensor array) 12 is used for detecting finger or pen.When finger or style of writing control; The resistance value or the capacitance of the sensing unit array of being made up of resistance or electric capacity 12 can change; Such as; When finger is pressed in 11 last times of electric resistance touch-control panel of elastic material, can make the reduced distances of upper and lower two electrodes (electrode), and change the resistance value between two electrodes; Or be pressed on the capacitance type touch-control panel 11 when finger, the conductive characteristic of human body can influence two electrodes electric capacity, and change the capacitance between two electrodes.So utilize the variation of detecting resistance value or capacitance, detect the touch-control and the power of finger or pen.
See also Fig. 2, Fig. 2 shows the sequential chart the when sensing signal of contact panel has noiseless.Yet sensing unit receives interference of noise easily, and therefore can increase the change of judging capacitance is that Zhao Yin is in the finger touch or the difficulty of neighbourhood noise.For instance, as far as the electric capacity of a 50pF, the change that finger is caused is about 1pF.When being charged to the voltage quasi position of 2V; The voltage change that finger is caused is about 40mV, and interference of noise makes that also greatly about tens of mV signal noise ratio (SNR) is strong inadequately; Cause erroneous judgement easily, even cause and do not have touch-control but to judge into the glitch of ghost (ghost effect) by accident.
In addition; The function of the many radio communications of the most collocation of contact panel now (infrared transmission or blue bud (Bluetooth) transmission); Or arrange in pairs or groups liquid crystal panel backlight or the like; So the suffered noise source of contact panel is quite complicated, for example the communication microwave (communication microwave) that produces of flicker noise (1/f noise), white noise (white noise), power noise (power noise), 50/60Hz noise, infrared ray or blue bud wireless transmission, noise backlight (backlight noise) etc.Generally can use low-pass filter (Low Pass Filter) to filter high frequency noise; But for low-frequency noises such as flicker noise or 50/60Hz noises; If the low pass filter design of using is at lower cutoff frequency (cut off frequency); Though can filter low-frequency component, the reaction time also can be and then slack-off.For instance, in order to filter the 60Hz noise, and make the cutoff frequency of low-pass filter operate in 10Hz, will make reaction time delay about 0.1 second, the spinoff that it caused is equivalent to setting-out speed and postpones 0.1 second.That is to say, point the situation generation that the time that presses application program (such as towing photo) reaction has delay, the inconvenience that causes in the use.
In order to improve this problem; Traditional demodulation technology (modulation and demodulation) can load the input signal (modulation) that voltage that a certain frequency is f1 or current signal are used as modulating on sensing cell; Then measure corresponding voltage of sensing cell or current signal; Utilize the signal demodulation (demodulation) of frequency f 2, produce frequency and be (f1+f2) and (f1-f2) signal, pass through low-pass filter again its cutoff frequency is operated in (f1+f2)/below 2; To filter radio-frequency component, measure low-frequency component.When selecting f1=f2, its low-frequency component is exactly a dc terms, just wants signal.As long as measure the change of dc terms, the electric capacity when being equivalent to measure finger touches changes.Because demodulation techniques are operable in the wave band of high frequency, so can avoid low noise interference.But conventional modulated and demodulation techniques need that the high analog form of complexity is real to be done, and simulation extra buffer circuit of needs during with the digital circuit coexistence, and this can increase cost of developing.
Please consult Fig. 1 and Fig. 3 in the lump, Fig. 3 is the functional block diagram of the control module 14 of Fig. 1.Measure path (trace) A and path B and inequality that A point and B are ordered, so the signal after the demodulation can have different demodulation amplitudes because of different path delays, make path delay big more, the demodulation amplitude is more little, reduces the dynamic range of induction.At large-sized sensing unit array, the problem in path delay can be more serious.So can adopt a phase corrector (Phase Calibration) 22 to measure all path delays traditionally and each node is carried out phase compensation (phase compensation).At first when sensing unit array 12 places isolation (un-touched), signal generator 24 can export in regular turn a square wave as drive signal to each sensing unit.During isolation, each sensing unit produces interdependent sensing signal to sensor 26 through after path delay.And phase corrector 22 can produce same frequency square wave and institute's acknowledge(ment) signal demodulation of various phase places, with the autocorrelogram (autocorrelation) that draws various phase places, and selects the pairing phase place of maximal value as the needed phase compensation value of this node.Then producing the phase compensation value of all nodes in regular turn, to produce a question blank (Look Up Table).When measuring afterwards, integrating instrument 28 can table look-at as phase compensation, also can only do several points and measure, such as 4 in corner etc. on every side, produce phase compensation value with the mode of linear interpolation.The calculating that yet above-mentioned phase correction and phase compensation are too complicated and need be a lot.
Summary of the invention
According to characteristics of the present invention, electronic installation comprises a contact panel, and it comprises a plurality of sensing units; One detector is used for transmitting drive signal, and this drive signal has a default cycles (T1) and an additional phase information; And a sensor, be used for receiving a sensing signal and determine a detecting value according to this default cycles and this phase information of this drive signal.
In one embodiment of this invention, this detector comprises a signal generator, is used for producing this drive signal; And a phase place carrier, be coupled to this signal generator, be used for producing this phase information, and additional this phase information is on this drive signal.This drive signal that this signal generator produces is a square wave; This phase place carrier is used for this phase information tag1 is additional to the rising edge of this drive signal; Or phase information tag2 is additional to the falling edge of this drive signal; Make the rising edge amplitude of this drive signal of additional this phase information be lower than the lowest amplitude of this square wave, or the falling edge amplitude of this drive signal of additional this phase information is higher than the crest amplitude of this square wave.Postpone " Ttag1+ (T1/2-Ttag2) " than first phase information time delay of the rising edge of this restituted signal; Postpone " Ttag1+ T1/2+ (T/2-Ttag2)/2 " than this first phase information the time delay of the falling edge of restituted signal, and wherein the pulsewidth of phase information tag1 is that the pulsewidth of Ttag1 and phase information tag2 is Ttag2.
In one embodiment of this invention, each sensing unit is a self-capacitance formula sensing unit or a mutual capacitance type sensing unit or a resistance-type sensing unit.
In one embodiment of this invention, this sensor comprises a signal extractor, be used for producing a restituted signal according to the pulsewidth of this default cycles of this drive signal and this phase information, and should the detecting value with decision according to this this sensing signal of restituted signal demodulation; And a phase detector, be coupled to this signal extractor, be used for amplitude in this sensing signal during greater than a default value, start this signal extractor.This electronic installation comprises an internal memory in addition, is used for storing the waveform of this sensing signal, when wherein this phase detector is used for according to this phase information this sensing signal being carried out auto-correlation and being calculated, starts this signal extractor.
In one embodiment of this invention, this electronic installation comprises an analog-digital converter in addition, is coupled between this sensing unit of this sensor and this contact panel, and this sensing signal is used for taking a sample.
In one embodiment of this invention, wherein this sensor and this detector are to realize with a digital signal processor to this electronic installation.
In one embodiment of this invention, this signal generator is a generator at random, and this drive signal is the square wave that produces at random.
In one embodiment of this invention, this detector is used for the drive signal to each sensing unit output different cycles of coupling.This sensor is used for each sensing unit that couples is produced a plurality of detecting values, and each detecting value is relevant with the variation of the default cycles of this drive signal of this phase information, the corresponding reception of each sensing unit and this sensing signal.
Another characteristics of the present invention are to provide a kind of method that is used to handle the sensing signal of an electronic installation; This electronic installation comprises a contact panel; It comprises a plurality of sensing units, and this method comprises the following step: produce the drive signal with a default cycles; An additional phase information is in this drive signal and be sent on these sensing units of this contact panel; When an object contacts a sensing unit of this contact panel, produce a sensing signal; Carry out a peak value and detect obtaining this sensing signal, and produce a demodulation starting point in view of the above corresponding to this phase information part; And produce a restituted signal, and utilize this this sensing signal of restituted signal demodulation to determine the touch position of this contact panel according to the default cycles of this phase information and this drive signal.
Compared to prior art, detector of the present invention utilizes the phase place carrier that phase information is additional on the drive signal to produce a modulated drive signal.Sensing unit produces corresponding sense signals according to modulated drive signal again.The phase detector of last sensor can directly can be read the cycle and the phase position of drive signal from sensing signal voluntarily, so do not need additional circuit to do phase compensation.Therefore can significantly reduce cost of developing.
For letting the foregoing of the present invention can be more obviously understandable, hereinafter is special lifts preferred embodiment, and cooperates appended graphicly, elaborates as follows.
Description of drawings
Fig. 1 is the synoptic diagram that tradition has the electronic installation of contact panel.
Fig. 2 is the sensing signal that the shows contact panel sequential chart when noiseless is arranged.
Fig. 3 is the functional block diagram of the control module of Fig. 1.
Fig. 4 is the functional block diagram of the electronic installation of the first embodiment of the present invention.
Fig. 5 is the sequential chart of the signal that produces of each unit of detector of Fig. 4.
Fig. 6 is sensing signal, the modulated drive signal of Fig. 4, the sequential chart of restituted signal.
Fig. 7 is that the frequency component that illustrates sensing signal is direct current, exceeds f, equals f and during less than f and the relation of restituted signal.
Fig. 8 is the functional block diagram of the electronic installation and the contact panel of second embodiment of the invention.
Fig. 9 is the method flow diagram that the present invention handles the information of electronic installation.
Embodiment
The present invention utilizes the characteristic of orthogonal vector.Each vector of supposing a vector group is for Vi, i=0 wherein, and 1 ..., n.(that is Vi * Vj=0, wherein i ≠ j), an and vector and the product of self are 1, and (that is Vi * Vj=1, wherein i=j), then this is the orthogonal vector crowd if a vector is 0 with the product of different vectors.When V1=(a1, b1, c1, d1) and V2=(a2, b2, c2, d2), then the product of V1 * V2 equals a1 * a2+b1 * b2+c1 * c2+d1 * d2.For example, if vector group comprises two vector: V1=(0,0,0,1) and V2=(0,0,1,0), then satisfy V1 * V1=1, V1 * V2=0, and V2 * V2=1.Therefore, V1 and V2 are quadrature.
Any signal all can be expressed as the orthogonal vector crowd, like S=c1V1+c2V2+c3V3+ ... + cnVn, c1 wherein, c2 ..., cn is a coefficient.If neighbourhood noise is expressed as N=100V1+50V2+20V3+10V4+2V5+4V6+10V7 ..., each vectorial V1 wherein, V2 ... Represent the component of a special frequency band.For a known signal A, if selected V5 is a modulation vector, then modulated signal that is input signal Si=AV5.Can know this signal meeting coupled noise, therefore export signal So=AV5+100V1+50V2+20V3+10V4+2V5+4V6+10V7 ... V5+4V6+the 10V7 of=100V1+50V2+20V3+10V4+(A+2) ...If use identical vectorial V5 as demodulation vector, then signal Sr=So * V5=100 * 0+50 * 0+20 * 0+10 * 0+(A+2) * 1+4 * 0+10 * 0 of reduction ...=A+2.
Like finding person, the signal of reduction only can stay a little noise.Yet, as above mentioned, in order to reduce noise, should select low noise component < for example above-mentioned V5>as the modulation and demodulation vector.
See also Fig. 4, Fig. 4 is the functional block diagram of the electronic installation 100 of the first embodiment of the present invention.Electronic installation 100 comprises control module 101 and contact panel 102.101 of control modules comprise detector 104, sensor 106, analog-digital converter (Analog-to-digital converter, ADC) 108, current source 110, output go into passage 112.Contact panel 102 comprises a plurality of mutual arrangement sensing units 1026 (that is row) and sensing unit 1028 (also at once), preferably, and sensing unit the 1026, the 1028th, arranged.Sensing unit the 1026, the 1028th, electric conductor can be used to transmit electrical signals.Detector 104 is used for output drive signal, and sensor 106 is used for receiving sensing signal.Control module 101 be with digital signal processor (Digital signal processor, DSP) or software program code realize.Each self-capacitance (self capacitance) is to be formed on sensing unit 1026 or the sensing unit 1028, representes position of touch in order to form a binary axis coordinate.Each self-capacitance can change its capacitance because of an object is approaching.When finger or other objects during near contact panel 102, near the capacitance of the sensing unit 1026,1028 the finger can change.This be because dV/V=-dC/C, so the variation of capacitance makes that also voltage changes, wherein V representes the voltage on the sensing unit 1026,1028, and C representes the capacitance of sensing unit 1026,1028.When touching takes place, the pairing sensing unit of contact point 1026, can produce the capacitive coupling phenomenon between 1028 and the voltage of sensing signal is changed, control module 101 can be judged the position of touch points according to the change in voltage that sensing signal takes place.
Please consult Fig. 4 and Fig. 5 in the lump, Fig. 5 is the sequential chart of the signal that produces of each unit of detector 104 of Fig. 4.Detector 104 comprises signal generator (signal generator) 142 and phase place carrier (tag generator) 144.This signal generator 142 is squarers, is used for producing the drive signal (driving signal) 146 (cycle T 1) that is one-period property square wave (periodical square waveform).This phase place carrier 144 is coupled to signal generator 142, is used for phase information (phase information) tag1, tag2 are additional to drive signal 146 with the usefulness as demodulation.
See also Fig. 5; Phase place carrier 144 is additional to the first phase information tag1 rising edge (rising edge) of drive signal 146; And the second phase information tag2 is additional to the falling edge (falling edge) of drive signal 146; Make the rising edge amplitude of the drive signal 146 of the additional first phase information tag1 be lower than the lowest amplitude of this square wave, the falling edge amplitude of the drive signal 146 of the additional second phase information tag2 is higher than the crest amplitude (maximum amplitude) of this square wave simultaneously.Preferably, the pulsewidth Ttag2 of the pulsewidth Ttag1 of the first phase information tag1 and the second phase information tag2 is all very of short duration and equal.Digital signal processor with 100MHz is an example, can set pulsewidth Ttag1=Ttag2=0.1us=100ns.At this moment, modulated drive signal (modulation driving signal) 148 promptly produces.
Detector 104 can modulated drive signal 148 of carrying phase information tag1, tag2 of output come the sensing unit 1026,1028 of 110 pairs of contact panels 102 of drive current source (current driver) to discharge and recharge.So the first phase information tag1 can let sensor 106 identify the primary importance of sensing signal, and replacement current source 110 makes its probe current reduce to minimum power supply voltage, VSS for the usefulness of charge path subsequently.The second phase information tag2 can let sensor 106 identify the second place of sensing signal, and set current source 110 make its probe current to maximum power supply voltage VDD for the usefulness of discharge path subsequently.
Note that detector 104 can be sent to sensor 106 with the cycle T 1 of drive signal 146, the pulsewidth Ttag1 of the first phase information tag1 and the information such as pulsewidth Ttag2 of the second phase information tag2, produce the usefulness of restituted signal W for sensor 106.
In addition, signal generator 142 also can produce drive signal 146 to the different sensing unit 1026,1028 of different cycles (that is different frequency).Such as, the drive signal 146 of life cycle T1 during the sensing unit E of detection sensor unit 1026, the drive signal 146 of life cycle T2 during the sensing unit D of detection sensor unit 1028.But survey a certain sensing unit 1026,1028 o'clock, the cycle of drive signal 146 must be identical with the cycle of being sent to signal extractor 164.Such as, the drive signal 146 of life cycle T1 during detection sensor unit E, and see off simultaneously periodic quantity T1 to signal extractor 164 to form restituted signal W so that take out the sensing signal of sensing unit E; The drive signal 146 of life cycle T2 during the detection sensor cells D, and see off simultaneously periodic quantity T2 to signal extractor 164 to form another restituted signal W so that take out the sensing signal of sensing unit D.
See also Fig. 4.In the present embodiment, (Analog-to-digital converter, ADC) 108 is to be used for taking a sample sensing signal Vin to analog-digital converter.The sampling frequency of ADC 108 can determine the sensitivity to phase information pulsewidth Ttag1, Ttag2, and to sensitivity and the error of sensing signal Vin.Analog-digital converter 108 can be an a/d converter successive approximation (Successive approximation ADC, SAR ADC).When a/d converter successive approximation 108 is made (implement) so that digital signal processor is real; Its sampling frequency is decided by the frequency of operation (operating frequency) of digital signal processor, and software program code is used to compare the working time that n bit (bit) is spent.In order to increase sampling frequency, can use a plurality of a/d converter successive approximations 108 to search simultaneously.For instance; Use single a/d converter successive approximation 108 only can carry out binary search; But use simultaneously such as forming with three a/d converter successive approximations 108; Just can carry out quaternary search, search speed will be more fast again than using single a/d converter successive approximation 108 thus.In addition, in order to increase the scope of a/d converter successive approximation 108 dynamic detections, the maximal value of its dynamic range and minimum value can be added estimation range decision by the detection threshold of previous moment gained.Such as the detecting voltage value of previous moment gained is 1.22V, and preset range is set at 40mv, and then the maximal value of a/d converter successive approximation 108 dynamic detections is 1.22V+40mV this moment.Minimum value is 1.22V – 40mv, can detect+/-the interior induced voltage Vin of 40mv scope.
Please consult Fig. 4 and Fig. 6 in the lump, Fig. 6 is sensing signal Vin, the modulated drive signal of Fig. 4, the sequential chart of restituted signal W.The electric current I that produces when modulated drive signal 148 is sent to sensing unit 1026,1028 when it is discharged and recharged, and a certain contact point is just in time pushed because of finger or other touch-control object and made the reduced distances of 1026,1028 of sensing units change capacitance C; Because in a set time T, the charge Q=I of sensing unit 1026,1028 * T=C * V is definite value (because the I definite value, T is the set time) again, thus dV/V=-dC/C.That is to say that when capacitor C changed, voltage V (sensing signal Vin just) also changed.So, just can judge according to the change in voltage of sensing signal Vin whether finger has contact according to aforesaid equation.
In another embodiment, control module 104 comprises an internal memory 122 in addition, is used for storing the waveform of sensing signal Vin.Phase detector 162 is used for when utilizing phase information tag1, tag2 that sensing signal Vin is carried out auto-correlation (autocorrelation) and calculates the reference position with the decision demodulation, enabling signal extractor 164.
The first pulsewidth Ttag1 of the cycle T 1 of the drive signal 146 that signal extractor 164 transmits according to detector 104, the first phase information tag1 of phase place carrier 144 and the second pulsewidth Ttag2 of the second phase information tag2 produce a restituted signal (demodulation signal) W.Restituted signal W is a square wave (or string ripple); Its cycle meets the cycle T 1 of drive signal 146; And the time delay of the rising edge of this restituted signal W (t1 ') postpone " Ttag1+ (T1/2-Ttag2) " than the first phase information tag1, the time delay of the falling edge of restituted signal W (t2 ') postpone " Ttag1+ T1/2+ (T/2-Ttag2)/2 " than this first phase information.The digital value of restituted signal square wave (1 ,-1).
See also Fig. 7.Fig. 7 illustrates the demodulation principle of signal extractor 164, and signal extractor 164 utilizes restituted signal W that sensing signal Vin is carried out orthogonal operation to take out the frequency component identical with restituted signal W among the sensing signal Vin.In dsp code, can above-mentioned computing be denoted as, wherein Vin representes sensing signal, and W representes restituted signal, and M representes the sum and measurement number of times of measurement point.As shown in Figure 7, when the frequency component of sensing signal Vin exceeds f, be all the orthogonal operation of restituted signal W of T1 through periodic quantity after, just positive and negative counteracting; When a certain frequency component of sensing signal Vin is lower than f, be all the orthogonal operation of restituted signal W of T1 through periodic quantity after, just positive negative disappears; When the frequency component of sensing signal is D. C. value (DC), be all the orthogonal operation of restituted signal W of T1 through periodic quantity after, just positive negative disappears; When having only frequency component f among the sensing signal Vin just in time to meet 1/T1, the frequency component that is all through periodic quantity behind the multiply-add operation of restituted signal W of T1 just can be removed.
Please continue to consult Fig. 6, sensing signal Vin is divided into interchange (an AC term), relative displacement item (dummy term) and dc terms (DC term).Because the sensor 106 actual sensing signal Vin that received just are not triangular waveforms, but have the relative displacement item that carries phase information tag1, tag2, the hybrid waveform that exchanges item, dc terms and noise.As shown in Figure 6, the component of signal 176 of restituted signal W and the product of the component of signal 172 of relative displacement item, the component of signal 178 with restituted signal W is identical with the product of the component of signal 174 of relative displacement item just, the filtering so both repeal by implication.Same, the item that exchanges of dc terms and other frequencies that do not belong to frequency f also can be by filtering, has only in the relative displacement item pulse 170 corresponding to phase information tag1, tag2, has the interchange item of frequency f and near be positioned at the frequency f noise still exists.Clearly, most noise is by filtering, and is positioned near the noise less (because selected frequency f can be chosen in the less frequency of relative noise originally) the frequency f.No matter whether the capacitance of sensing unit 1026,1028 changes (whether contact is just arranged), in the relative displacement item corresponding to the pulse of phase information tag1, tag2 170 because very of short duration and be definite value, so can ignore.
In such event, signal extractor 164 can judge whether the capacitance of sensing unit 1026,1028 changes by restituted signal W demodulation sensing signal Vin.When sensing unit 1026,1028 during because of finger or the contact of other touch-control object, its capacitance (detecting value) will change.Last control module 101 just can obtain the coordinate and the application of force size of the sensing unit 1026,1028 that quilt is touched on the contact panel 102.
See also Fig. 8, Fig. 8 is the functional block diagram of the electronic installation 200 and the contact panel 202 of second embodiment of the invention.For the purpose of simplifying the description, unit every with shown in Figure 4 has identical numbering person and has identical functions in Fig. 8.Sensing unit comprises 2 layers of electric conductor; Wherein one deck is a plurality of detecting conductors (driving conductor) 1022 (that is each row of contact panel 202), and another layer is a plurality of sensor conductors (sensing conductor) 1024 (that is each row of contact panel 202).And the intersection point part of the detecting conductor of contact panel 202 1022 and sensor conductor 1024 forms mutual capacitance (mutual capacitance), but both to be not entity electrically contact.Detector 104 is coupled to a voltage controller 110 with output drive signal.Voltage controller 110 can the converting digital modulated drive signal be a simulating signal.The analog-modulated drive signal is gone into channel 114 via output and is sent to each bar detecting conductor 1022, and sensor 106 is coupled to each bar sensor conductor 1024 through exporting passage 112, is used for receiving sensing signal.Control module 201 be with digital signal processor (Digital signal processor, DSP) or software program code realize.The detector 104 of control module 101 can take turns output drive signal to drive each bar detecting conductor 1022; When finger, pointer or other objects when multiple spot contact (multi-touch) is to contact panel 202 simultaneously, with certain point of the staggered sensor conductor 1024 of detecting conductor 1022 sensing signal that the capacitive coupling phenomenon makes sensor conductor 1024 produce can take place change in voltage can take place.After scanning each bar detecting conductor 1022 one by one, can know definite contact position.For instance; Touch object (for example finger) is when contact self-capacitance formula contact panel 102; 1020 in finger and lead produce capacitive coupling and the voltage of sensing signal are changed, and control module 101 can be judged the position of touch points according to the change in voltage that sensing signal takes place.For the purpose of simplifying the description, detector 104 is consistent with the running same unit that Fig. 4 illustrated with the function of sensor 106, does not give unnecessary details in addition at this.
See also Fig. 9, Fig. 9 is the method flow diagram that the present invention handles the information of electronic installation.The method includes the steps of:
Step 900: utilize signal generator 142 to produce and have the drive signal 146 of default cycles T1.
Step 902: utilize phase generator 144 additive phase information tag1, tag2 in this drive signal 146, and be sent on the sensing unit 1026,1028 of contact panel.
Step 904:, produce a sensing signal Vin in a sensing unit of this contact panel 102 of object contact 1026,1028 o'clock.
Step 906: utilize phase detector 162 to carry out a peak value and detect obtaining this sensing signal Vin, and produce a demodulation starting point in view of the above corresponding to phase information tag1, tag2 part.
Step 908: the default cycles T1 according to phase information tag1, tag2 and drive signal 146 produces a restituted signal W, and utilizes this restituted signal tag1, tag2 demodulation sensing signal Vin to determine the touch position of contact panel 102.
The self-capacitance formula sensing unit 1026,1028 of the contact panel 102 of above embodiment is as explanation; Be familiar with that this art can be understood mutual capacitance type sensing unit or the principle of operation of resistance-type sensing unit and it is approximate; In another embodiment; Signal generator 104 also can be a Pseudo-Random Noise Code (Pseudorandom noise code, a PN code) generator, and drive signal 146 is the square waves that produce at random.
In sum; Though the present invention discloses as above with preferred embodiment; But this preferred embodiment is not that the those of ordinary skill in this field is not breaking away from the spirit and scope of the present invention in order to restriction the present invention; All can do various changes and retouching, so protection scope of the present invention is as the criterion with the scope that claim defines.
Claims (19)
1. electronic installation, it comprises a contact panel, and it comprises several sensing units, it is characterized in that, and said electronic installation comprises in addition:
One detector is used for transmitting a drive signal, and said drive signal has a default cycles and additive phase information; And
One sensor is used for receiving a sensing signal and determines a detecting value according to the said default cycles and the said phase information of said drive signal.
2. electronic installation as claimed in claim 1 is characterized in that: said detector comprises:
One signal generator is used for producing said drive signal; And
One phase place carrier is coupled to said signal generator, is used for producing said phase information, and additional said phase information is on said drive signal.
3. electronic installation as claimed in claim 2; It is characterized in that: the said drive signal that said signal generator produces is a square wave; Said phase place carrier is used for said phase information is additional to the rising edge of said drive signal; Or be additional to the falling edge of said drive signal; Make the rising edge amplitude of the said drive signal of additional said phase information be lower than the lowest amplitude of said square wave, or the falling edge amplitude of the said drive signal of additional said phase information is higher than the crest amplitude of said square wave.
4. electronic installation as claimed in claim 1 is characterized in that: each sensing unit is a self-capacitance formula sensing unit.
5. electronic installation as claimed in claim 6 is characterized in that: each sensing unit is a mutual capacitance type sensing unit.
6. electronic installation as claimed in claim 1 is characterized in that: said sensor comprises:
One signal extractor is used for producing a restituted signal according to the said default cycles of said drive signal and the pulsewidth of said phase information, and the said sensing signal of the said restituted signal demodulation of foundation is to determine said detecting value; And
One phase detector is coupled to said signal extractor, is used for amplitude in said sensing signal during greater than a default value, starts said signal extractor.
7. electronic installation as claimed in claim 6; It is characterized in that: other comprises an internal memory; Be used for storing the waveform of said sensing signal, when wherein said phase detector is used for according to said phase information said sensing signal being carried out auto-correlation and being calculated, start said signal extractor.
8. electronic installation as claimed in claim 1 is characterized in that: said electronic installation comprises an analog-digital converter in addition, is coupled between the said sensing unit of said sensor and said contact panel, and said sensing signal is used for taking a sample.
9. electronic installation as claimed in claim 1 is characterized in that: said sensor and said detector are to realize with a digital signal processor.
10. electronic installation as claimed in claim 1 is characterized in that: said signal generator is a Pseudo-Random Noise Code, and said drive signal is the square wave that produces at random.
11. electronic installation as claimed in claim 1 is characterized in that: each sensing unit is a resistance-type sensing unit.
12. electronic installation as claimed in claim 1 is characterized in that: said detector is used for to the drive signal of each the sensing unit output different cycles that couples;
Said sensor is used for each sensing unit that couples is produced several detecting values, and the default cycles of each detecting value and the said drive signal of said phase information, the corresponding reception of each sensing unit and the variation of said sensing signal are relevant.
13. a method that is used to handle the sensing signal of an electronic installation, said electronic installation comprises a contact panel, and it comprises several sensing units, and said method comprises:
Generation has a drive signal of a default cycles;
Additive phase information is in said drive signal and be sent on the sensing unit such as said of said contact panel;
When an object contacts a sensing unit of said contact panel, produce a sensing signal;
Carry out a peak value and detect obtaining said sensing signal, and produce a demodulation starting point in view of the above corresponding to said phase information part; And
Default cycles according to said phase information and said drive signal produces a restituted signal, and utilizes the said sensing signal of said restituted signal demodulation to determine the touch position of said contact panel.
14. method as claimed in claim 13; It is characterized in that: said drive signal is a square wave; Said phase information is additional to the rising edge or the falling edge of said drive signal; Make the rising edge amplitude of the said drive signal of additional said phase information be lower than the lowest amplitude of said square wave, the falling edge amplitude of the said drive signal of additional said phase information is higher than the crest amplitude of said square wave simultaneously.
15. method as claimed in claim 13 is characterized in that: each sensing unit is a self-capacitance formula sensing unit.
16. method as claimed in claim 13 is characterized in that: each sensing unit is a mutual capacitance type sensing unit.
17. method as claimed in claim 13 is characterized in that: said drive signal is the square wave that produces at random.
18. method as claimed in claim 13 is characterized in that: each sensing unit is a resistance-type sensing unit.
19. method as claimed in claim 13 is characterized in that: said method comprises in addition:
When the amplitude of said sensing signal during, produce a restituted signal according to the cycle of said drive signal and the pulsewidth of said phase information greater than a default value; And
The said sensing signal of the said restituted signal demodulation of foundation is to determine said detecting value.
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