CN202171792U - Detection electrode array control circuit and touch-control detection system with same - Google Patents
Detection electrode array control circuit and touch-control detection system with same Download PDFInfo
- Publication number
- CN202171792U CN202171792U CN2011202805172U CN201120280517U CN202171792U CN 202171792 U CN202171792 U CN 202171792U CN 2011202805172 U CN2011202805172 U CN 2011202805172U CN 201120280517 U CN201120280517 U CN 201120280517U CN 202171792 U CN202171792 U CN 202171792U
- Authority
- CN
- China
- Prior art keywords
- signal
- phase frequency
- intensity
- electrode array
- phase
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Landscapes
- Electronic Switches (AREA)
Abstract
The utility model discloses a detection electrode array control circuit and a touch-control detection system with the detection electrode array control circuit. The control circuit for the detection electrode array comprises a signal intensity analyzer, an intensity/phase frequency converter and a phase frequency analyzing unit. The signal intensity analyzer gains the corresponding intensity signal according to the detection signal of each detection line on the detection electrode array, and every intensity signal is a direct current signal. The intensity/phase frequency converter generates corresponding phase frequency signals according to each intensity signal, and at least one of the frequency and the phase position of every phase frequency signal is related to the level of the corresponding intensity signal. The phase frequency analyzing unit gains the corresponding semaphore of the detection line according to each phase frequency signal. The touch-control detection system with the detection electrode array control circuit has higher signal noise ratio and faster operating speed, and the detection electrode array control circuit can improve the operating speed and the signal noise ratio of the touch-control detection system on the premise of not increasing the manufacturing cost.
Description
Technical field
The utility model relates to a kind of touch detection system, and is particularly related to a kind of detecting electrode array control circuit and touch detection system thereof that is used for touch detection system.
Background technology
Touch detection system is widely used at present in various display devices, adopts the contact panel of which kind of size to come to light in daily life no matter wherein be.For instance, intelligent mobile phone uses undersized contact panel, the contact panel of size during Automatic Teller Machine then uses.
Contact panel mainly contains types such as resistance-type and capacitance type touch-control panel at present.Yet,, and need detecting electrode array control circuit to detect the touching zone that the user is touched on contact panel no matter be that the contact panel of that type all has the detecting electrode array.
Please with reference to Fig. 1, Fig. 1 is the functional structure chart of traditional touch detection system.Tradition touch detection system 1 comprises traditional detection electrode array control circuit 11, multiplexer 12,13, contact panel 14, pulse signal producer 15 and digital signal processing circuit 16.Pulse signal producer 15 connects multiplexer 13, and multiplexer 13 connects contact panel 14.Contact panel 14 connects multiplexer 12, and multiplexer 12 is connected traditional detection electrode array control circuit 11 with digital signal processing circuit 16.
A plurality of input ports of multiplexer 12 receive a plurality of detection signal Sensing_Sigs, and multiplexer 12 is also in order to receive control signal Control_Sig.Multiplexer is delivered to traditional detection electrode array control circuit 11 with each detection signal Sensing_Sig in order according to the control of control signal Control_Sig; In other words, each detection signal Sensing_Sig can be sent to traditional detection electrode array control circuit 11 in different time.
Traditional detection electrode array control circuit 11 receives a plurality of detection signal Sensing_Sigs, and obtains the semaphore of pairing detection line according to each detection signal Sensing_Sigs.In more detail; When the user touches contact panel 14; At least having part detection signal Sensing_Sigs can change; In view of the above, traditional detection electrode array control circuit 11 will be different according to the semaphore of each detection line that detection signal Sensing_Sigs is obtained, and then the digital signal processing circuit 16 of rear end is able to judge that the change amount signal of each detection line before and after touching comes successfully to obtain the touching zone.
Please with reference to Fig. 2, Fig. 2 is the structural representation of contact panel.Contact panel 14 also comprises panel 141, drive signal impact damper 142, drive electrode 143 and receiving electrode 144.Drive signal impact damper 142 receives a plurality of drive signal Driving_Sigs, and produces a plurality of driving pulse Drive_Pulse in view of the above.Driving pulse Drive_Pulse is sent to many drive wires respectively through drive electrode 143, and a plurality of detection signal Sensing_Sigs is sent to multiplexer 12 through receiving electrode 144.
When user's finger touches during to panel 14, the formed electric field of Partial Drive Pluse Drive_Pulses can be because the factor of a coupling, and is coupled to user's finger.Part detection signal Sensing_Sigs when the part detection signal Sensing_Sigs when in view of the above, user's finger touches is to panel 141 will not touch panel 141 with the finger the user is different.So, only to just can obtain the touching zone of user's finger through the variation of test section detection signal Sensing_Sigs in contact panel 14.
Please continue with reference to Fig. 1, traditional detection electrode array control circuit 11 comprises integrator 111, sample-and-hold circuit 112 and analog-digital converter 113.Integrator 111 is coupled to sample-and-hold circuit 112, and sample-and-hold circuit 112 is coupled to analog-digital converter 113.
The function of integrator 111 is as shown in Figure 3, and please with reference to Fig. 3, Fig. 3 is the input of integrator and the oscillogram of output signal.Integrator 111 is in order to will be to one section special time of detection signal Sensing_Sig integration of input, and the integrated signal Integrated_Sig behind the integration exported.Integrator 111 can be after special time finishes, and Integrated_Sig makes zero with integrated signal.
Once more with reference to Fig. 1; Sample-and-hold circuit 112 is in order to take a sample maintenance with output sampling holding signal to integrated signal Integrated_Sig when special time finishes; The holding signal of wherein taking a sample is the intensity level of integrated signal Integrated_Sig when special time finishes, and is d. c. voltage signal.
Analog-digital converter 113 is a digital signal in order to the analog signal conversion that sample-and-hold circuit 112 each signalling channel are exported.Analog-digital converter 113 is the important element of traditional detection electrode array control circuit 11, its can influence whole traditional touch detection system 1 signal noise ratio (Signal-to-Noise Ratio, SNR).
Thermonoise (thermal noise) in the tradition touch detection system 1 can influence the accurate position of d. c. voltage signal with flicker noise (flicker noise), and reduces signal noise ratio.In addition, when the supply voltage of traditional touch detection system 1 more and more hanged down, signal noise ratio also can be more and more littler.In view of the above, must adopt the comparatively good analog-digital converter 113 of usefulness can meet the predetermined requirement of signal noise ratio.Yet the cost of the analog-digital converter 113 that usefulness is good is higher, therefore may increase the manufacturing cost of traditional touch detection system 1.
In addition; In dead resistance and stray capacitance on the signal path of large touch panel all dead resistance and the stray capacitance on the signal path of the contact panel of reduced size is big; Therefore, the noise of traditional touch detection system of large touch panel and charge conversion loss (charge transfer loss) is also bigger in the employing.In other words, compared to the traditional touch detection system that adopts the small size contact panel, the signal noise of traditional touch detection system of large touch panel is lower in the employing.
Use the traditional detection electrode array control circuit regular meeting of analog-digital converter to comprise a digital analog converter, to promote whole signal noise ratio by this as baseline (baseline).Yet, because finger touches is little to the accurate position variation of the d. c. voltage signal of contact panel front and back, and receiving noise effect easily, the signal noise ratio that therefore can promote is limited.
In addition, integrator receives noise effect too easily, and causes the signal noise ratio of traditional touch detection system to be difficult for promoting.In addition, the computing of integrator is comparatively time-consuming, and integral operation each time all needs the special time of 24 microseconds (μ s)～40 microseconds, therefore also can cause the operating speed of traditional touch detection system to be difficult for promoting.
The utility model content
The utility model purpose provides a kind of detecting electrode array control circuit that is used for touch detection system, and it promotes the operating speed and the signal noise ratio of touch detection system in order to need not to increase under the prerequisite of manufacturing cost.
The utility model embodiment provides a kind of detecting electrode array control circuit, and this detecting electrode array control circuit comprises signal intensity resolver, intensity/phase frequency converter and phase frequency resolution unit.The signal intensity resolver obtains corresponding strength signal according to the detection signal of each the bar detection line on the detecting electrode array, and wherein each strength signal is a direct current signal.Intensity/phase frequency converter is connected in the signal intensity resolver, and produces corresponding phase frequency signal according to each strength signal, wherein the frequency of each phase frequency signal and phase place at least one of them be relevant to corresponding strength signal certainly.The phase frequency resolution unit is connected in intensity/phase frequency converter, and obtains the semaphore of corresponding said detection line according to each phase frequency signal.
In above-mentioned detecting electrode array control circuit, preferably, said signal intensity resolver is peak detctor or seals detecting device.
In above-mentioned detecting electrode array control circuit, preferably, said intensity/phase frequency converter is a voltage control oscillating circuit, and said phase frequency resolution unit is frequency counter or frequency discriminator.
In above-mentioned detecting electrode array control circuit; Preferably; Said intensity/phase frequency converter is phase modulator or phase place and frequency modulator, if said intensity/phase frequency converter is said phase modulator, then said phase frequency resolution unit is a phase demodulator; If said intensity/phase frequency converter is said phase place and frequency modulator, then said phase frequency resolution unit is phase place and frequency demodulator.
In above-mentioned detecting electrode array control circuit; Preferably; Said signal intensity resolver is the signal intensity resolver that can also obtain corresponding strength signal according to the drive wire signal of each the bar drive wire on the said detecting electrode array, and said phase frequency resolution unit is the phase frequency resolution unit that can also obtain a semaphore of corresponding said drive wire according to the phase frequency signal of each bar drive wire of said correspondence.
In above-mentioned detecting electrode array control circuit; Preferably; Also comprise: low noise amplifier, be connected in said signal intensity resolver, amplify in order to each said detection signal is carried out a low noise; Wherein said signal intensity resolver receives each the said detection signal after said low noise amplifies, and produces corresponding said strength signal in view of the above.
In above-mentioned detecting electrode array control circuit, preferably, also comprise: commutation circuit is connected between said signal intensity resolver and intensity/phase frequency converter, in order to a plurality of said strength signals are delivered to a plurality of signalling channels; And programmable gain amplifier, be connected in said commutation circuit, in order to adjusting the strength signal that each said signalling channel is transmitted, and said adjusted strength signal is passed to said intensity/phase frequency converting unit.
The utility model embodiment provides a kind of touch detection system, and this touch detection system comprises contact panel and the above-mentioned detecting electrode array control circuit with detecting electrode array.
In above-mentioned touch detection system, preferably, said signal intensity resolver is peak detctor or seals detecting device.
In above-mentioned touch detection system, preferably, said intensity/phase frequency converter is a voltage control oscillating circuit, and said phase frequency resolution unit is frequency counter or frequency discriminator.
In above-mentioned touch detection system; Preferably; Also comprise: micro-control unit; Be connected in said phase frequency resolution unit, judge the touching zone that the change amount signal of each said detection line is touched on said contact panel with the decision user according to the semaphore that said phase frequency resolution unit is produced.
In above-mentioned touch detection system; Preferably; Said detecting electrode array control circuit is the control circuit that is applicable to the touch detection system of plural mould operation, and it is finger or the passive type pointer that the active pointer of said drive signal, said user are provided that wherein said micro-control unit is judged in order to the instrument of touching said contact panel.
In above-mentioned touch detection system; Preferably; When in order to the instrument of touching said touch detection system being said user's finger or passive type pointer; Said micro-control unit provides the micro-control unit that a plurality of drive signals are given many drive wires of said contact panel; When said instrument for when the active pointer of said drive signal to be provided, said signal intensity resolver is the signal intensity resolver that can also obtain corresponding strength signal according to the drive wire signal of the said drive wire of each bar.
In sum; Compared to the traditional touch detection system that uses the traditional detection electrode array control circuit, use the touch detection system of the utility model creation detecting electrode array control circuit that embodiment provided to have than large-signal noise ratio and very fast operating speed.Simultaneously, also because the touch detection system of the utility model embodiment can have bigger signal noise ratio, large-sized contact panel during the contact panel of touch detection system can adopt.
For enabling further to understand the characteristic and the technology contents of the utility model; See also following about this novel detailed description and accompanying drawing; But these explanations are novel with the appended graphic explanation basis that only is used for, but not the interest field of the utility model is done any restriction.
Description of drawings
Fig. 1 is the functional structure chart of traditional touch detection system.
Fig. 2 is the structural representation of contact panel.
Fig. 3 is the input of integrator and the oscillogram of output signal.
Fig. 4 is the functional structure chart of the touch detection system that provides of the utility model embodiment.
Fig. 5 is the equivalent function structural drawing of detecting electrode array control circuit when the touch-control instrument is active pointer that the utility model embodiment provides.
Fig. 6 is the equivalent function structural drawing of touch detection system when the touch-control instrument is passive type pointer or finger that the utility model embodiment provides.
Fig. 7 is the process flow diagram of the detecting electrode array control method that provides of the utility model embodiment.
Fig. 8 is the process flow diagram of the step S92 of the detecting electrode array control method that provides of the utility model embodiment.
Fig. 9 is the process flow diagram of the step S93 of the detecting electrode array control method that provides of another embodiment of the utility model.
Figure 10 is the process flow diagram of the detecting electrode array control method that provides of another embodiment of the utility model.
Wherein, description of reference numerals is following:
1: traditional touch detection system
11: the traditional detection electrode array control circuit
111: integrator
112: sample-and-hold circuit
113: analog-digital converter
12: multiplexer
13: multiplexer
14: contact panel
141: panel
142: the drive signal impact damper
143: receiving electrode
144: drive electrode
15: pulse signal producer
16: digital signal processing circuit
4: touch detection system
41: detecting electrode array control circuit
411: low noise amplifier
412: the signal intensity resolver
413: commutation circuit
414: programmable gain amplifier
415: intensity/phase frequency converter
416: the phase frequency resolution unit
42: multiplexer
43: multiplexer
44: contact panel
45: driving signal generator
46: operation processing unit
48: active pointer
5: touch detection system
6: touch detection system
S71～S74: steps flow chart
S81～S84: steps flow chart
S91～S93: steps flow chart
S101～S106: steps flow chart
Embodiment
Please with reference to Fig. 4, Fig. 4 is the functional structure chart of the touch detection system that provides of the utility model embodiment.Touch detection system 4 is applicable to plural mould operation, and its instrument that is used for touching can be for user's finger, the passive type pointer of any drive signal can be provided or can be the active pointer that drive signal can be provided.Touch detection system 4 comprises detecting electrode array control circuit 41, multiplexer 42,43, contact panel 44, driving signal generator 45 and operation processing unit 46.Driving signal generator 45 connects multiplexer 43, and multiplexer 43 connects contact panel 44.Contact panel 44 connects multiplexer 42, and multiplexer 42 joint detection electrode array control circuit 41.Operation processing unit 46 is coupled to multiplexer 42,43, driving signal generator 45 and detecting electrode array control circuit 41.
Be noted that operation processing unit 46 can judge the type of touch-control instrument, activation or forbidden energy driving signal generator 45 are wanted in decision in view of the above, and control multiplexer 43 and whether receive the drive wire signal DrvLine_Sigs on each bar drive wire.Only have when the touch-control instrument is finger or passive type pointer, driving signal generator 45 just can be enabled, and when the touch-control instrument was active pointer, driving signal generator 45 can be by forbidden energy.Briefly, operation processing unit 46, driving signal generator 45 and multiplexer 42,43 can form a micro-control unit, and detecting electrode array control circuit 41 can also further be integrated in the control wafer with above-mentioned micro-control unit.In addition; Operation processing unit 46 judges the mode of touch-control tool types is whether manually to switch the touch-control tool types through detecting the user; Or automatically detect and use the touch-control tool types; For example, judge the touch-control tool types according to the operating frequency of drive signal and the difference of signal amplitude.
At the touch-control instrument for finger or during the passive type pointer, drivings generator 45 in order to summation signals that a plurality of drive signal Driving_Sigs are provided to multiplexer 43,43 receptions of multiplexer summation signals.In addition, multiplexer 43 receives clock signal Clock_Sig and reset signal Reset_Sig.Multiplexer 43 exports on a plurality of output ports of multiplexer 43 according to the triggering of the clock signal Clock_Sig a plurality of drive signal Driving_Sigs with received summation signals in regular turn.A plurality of output ports of multiplexer 43 are connected respectively to a plurality of drive wires of contact panel 44, and a plurality of drive signal Driving_Sigs is transferred into a plurality of drive wires of contact panel 44 respectively.In addition, reset signal Reset_Sig is then in order to replacement multiplexer 43, so that multiplexer 43 is again from first output port output drive signal Driving_Sig.
When the touch-control instrument is active pointer; 43 of multiplexers are in order to receive the drive wire signal DrvLine_Sigs on each bar drive wire; And through the control of operation processing unit 46, multiplexer 43 can be delivered to detecting electrode array control circuit 41 with the drive wire signal DrvLine_Sigs on each bar drive wire.In more detail; Through the control of operation processing unit 46, multiplexer 42 and 43 can be in regular turn with the drive wire signal DrvLine_Sigs timesharing on the detection signal Sensing_Sigs on each bar detection line and each the bar drive wire deliver to detecting electrode array control circuit 41.
What deserves to be mentioned is that drive signal Driving_Sig can be pulse signal with recurrent pulses, periodic square wave signal, periodically sawtooth signal, string ripple signal, the cyclical signal of triangular signal or other types periodically.Generally speaking, the type of drive signal is not originally novel in order to restriction.
A plurality of input ports of multiplexer 42 receive a plurality of detection signal Sensing_Sigs, and multiplexer 42 is also in order to receive control signal Control_Sig.Multiplexer is delivered to detecting electrode array control circuit 41 with each detection signal Sensing_Sig in order according to the control of control signal Control_Sig; In other words, each detection signal Sensing_Sig can be sent to detecting electrode array control circuit 41 in different time.In addition, need to prove that in order to promote the operating speed of whole touch detection system 4, above-mentioned multiplexer 42 and 43 can adopt high speed multiplexer, for example can handle the high speed multiplexer of direct current to the broadband signal of 500MHz.
Be different from the traditional detection electrode array control circuit, detecting electrode array control circuit 41 and without any need for integrator and analog-digital converter, and detecting electrode array control circuit 41 also has the higher signal noise ratio.When if the touch-control instrument is passive type pointer or finger; Detecting electrode array control circuit 41 is the strength signals that the detection signal Sensing_Sig that belonged to medium-high frequency originally converted into a low frequency (direct current); For example; Obtain peak signal through peak detctor (peak detector), perhaps obtain to seal signal through sealing detecting device (envelope detector).When if the touch-control instrument is active pointer; Then detecting electrode array control circuit 41 also can convert the drive wire signal DrvLine_Sigs that belonged to medium-high frequency originally into the strength signal of a low frequency (direct current) except the detection signal Sensing_Sig that will belong to medium-high frequency originally converts the strength signal of a low frequency (direct current) into.Then, detecting electrode array control circuit 41 is accordinged to strength signal generation phase place, frequency or phase place of low frequency (direct current) and the phase frequency signal that frequency can change according to the accurate position of strength signal.
Afterwards; When if the touch-control instrument is passive type pointer or finger; Detecting electrode array control circuit 41 is resolved the phase frequency signal; To obtain the semaphore of corresponding said detection line, wherein the operation processing unit 46 of rear end is judged the touching zone that the change amount signal of said each detection line is touched on said contact panel 44 with the decision user according to each semaphore.When if the touch-control instrument is active pointer; Detecting electrode array control circuit 41 is resolved the phase frequency signal of corresponding detection line; Obtaining the semaphore of corresponding said detection line, and the phase frequency signal of resolving corresponding drive wire, to obtain the semaphore of corresponding said drive wire.
Each element of detecting electrode array control circuit 41 then, is described further.Detecting electrode array control circuit 41 comprises low noise amplifier (Low Noise Amplifier; LNA) 411, signal intensity resolver 412, commutation circuit 413, programmable gain amplifier (Programmable Gain Amplifier, PGA) 414, intensity/phase frequency converter 415 and phase frequency resolution unit 416.Low noise amplifier 411 is coupled to signal intensity resolver 412, and signal intensity resolver 412 is coupled to commutation circuit 413.Commutation circuit 413 is coupled to programmable gain amplifier 414, and programmable gain amplifier 414 is coupled to intensity/phase frequency converter 415.Intensity/phase frequency converter 415 is coupled to phase frequency resolution unit 416.Each element explanation of following related detection electrode array control circuit 41 is to be that passive type pointer or finger are example with the touch-control instrument, and the explanation under the situation that relevant touch-control instrument is active pointer then can be learnt according to following content, so repeat no more.
In addition, if the noise that detection signal Sensing_Sig receives is little, and the resolution that intensity/phase frequency converter 415 phase frequencies are resolved is enough accurate, and then this low noise amplifier 411 can use the amplifier of general type to replace.In addition, if noise and attenuation amplitude that detection signal Sensing_Sig receives are little, then can also low noise amplifier 411 be removed from detecting electrode array control circuit 41.
The strength signal that signal intensity resolver 412 is exported is similar to the signal of being exported behind detection signal process integrating circuit and the sample-and-hold circuit, and it is all d. c. voltage signal equally.Yet compared to integrator, the operating speed of signal intensity resolver 412 is very fast, therefore can promote the operating speed of touch detection system 4 effectively.
For instance, if signal intensity resolver 412 be peak detctor, then understand less than 1 microsecond usually from multiplexer 42 to the processing time that peak detctor spent.Example can be learnt thus, and the processing time (1 microsecond) is carried out the needed special time of integral operation (24 microseconds～40 microseconds) much smaller than integrator.In view of the above, compared to traditional touch detection system, the operating speed of touch detection system 4 is very fast.In addition, need to prove that signal intensity resolver 412 can also comprise wave filter or amplifier, so that strength signal is carried out filtering and amplification.
Intensity/phase frequency converter 415 converts the strength signal of each signalling channel into phase place, frequency or a phase place and frequency can be according to the phase frequency signal of the accurate position change of strength signal.For instance; Intensity/phase frequency converter 415 can be a voltage-controlled oscillator (Voltage Controlled Oscillator; VCO), when the accurate position of strength signal is big, the higher phase frequency signal of output frequency then; When the intensity of strength signal hour, the less phase frequency signal of output frequency then.
Yet, need to prove that intensity/phase frequency converter 415 does not exceed with voltage-controlled oscillator.For instance, intensity/phase frequency converter 415 can also be a phase modulator, when the accurate position of strength signal is big, the phase frequency signal that then output phase is bigger, when the accurate position of strength signal hour, the less phase frequency signal of output phase then.Intensity/phase frequency converter 415 even can be a phase frequency modulator that simultaneously phase place and frequency is carried out modulation; When the accurate position of strength signal is big; The phase frequency signal that then output phase and frequency are bigger; When the accurate position of strength signal hour, the less phase frequency signal of output phase and frequency then.
According to Principle of Communication,,, and cause the information of carrying to receive noise easily and mistake then because accurate position receives noise effect easily if use the standard position of signal to represent the information of carrying.Yet if when using phase place or the frequency of signal to represent to carry information, because phase place or frequency are not easy to receive noise effect, so information is not vulnerable to noise and mistake.
Detecting electrode array control circuit 41 is that the accurate position according to strength signal produces frequency, phase place or a frequency and the phase frequency signal of phase place along with the accurate position variation of strength signal; Therefore, the information about the touching zone is to use frequency, phase place or frequency and the phase place of phase frequency signal to represent.Use the standard position of sampling holding signal to represent to touch the information in zone compared to traditional touch detection system, the signal noise ratio of touch detection system 4 is higher.
With intensity/phase frequency converter 415 is that a voltage-controlled oscillator is that example describes; Wherein highest frequency F2 and the difference between the low-limit frequency F1 exported of voltage-controlled oscillator is 8MHz, and is 12.3KHz by the frequency offset Delta_F that noise caused.
When the user did not touch contact surface plate 44, the direct current quasi-position of strength signal was higher, so the voltage-controlled oscillator output frequency is the phase frequency signal of F2.Yet when the user touched contact surface plate 44, the detection signal of touching area relative detection line will change to some extent, therefore will cause the direct current quasi-position of strength signal to reduce, so voltage-controlled oscillator can output frequency be the phase frequency signal of F1.Through simple calculation, can learn signal noise ratio even can be up to 650 (SNR=(F2-F1)/Delta_F).
In view of the above, compared to traditional touch detection system, the signal noise of the touch detection system 4 of use detecting electrode array control circuit 41 is bigger and operating speed is also very fast.Simultaneously, also because touch detection system 4 can have bigger signal noise ratio, the contact panel 44 of touch detection system can in large-sized contact panel.In brief, the frequency range of the phase frequency signal that the voltage-controlled oscillator of contact panel 44 before and after touching exported is big, is not subject to noise effect, so signal noise ratio can increase significantly.
Phase frequency resolution unit 416 can be resolved each phase frequency signal, to obtain the semaphore of corresponding said detection line.Operation processing unit 46 is in order to generation control signal Control_Sig or reset signal Reset etc., and operation processing unit 46 is judged the touching zone that the change amount signal of said each detection line is touched on said contact panel 44 with the decision user according to each semaphore.In addition, operation processing unit 46 also can be carried out corresponding control program according to the touching zone, for example chooses the object on the touching zone.
The embodiment of phase frequency resolution unit 416 is corresponding to the embodiment of intensity/phase frequency converter 415.If intensity/phase frequency converter is a voltage-controlled oscillator, then phase frequency resolution unit 416 can for example be the frequency discriminator of easy frequency counter or complicacy etc.If intensity/phase frequency converter is a phase modulator, then phase frequency resolution unit 416 can for example be a phase demodulator.If intensity/phase frequency converter is phase place and frequency modulator, then phase frequency resolution unit 416 can for example be phase place and frequency demodulator.
When phase frequency resolution unit 416 was easy frequency counter, it can be used for judging the frequency height of a plurality of phase frequency signals, so, just can be obtained the semaphore of corresponding said detection line by each phase frequency signal.In addition, need to prove that above-mentioned commutation circuit 413 also can detect electrode array control circuit 41 certainly and remove, and programmable gain amplifier 414, intensity/phase frequency converter 415 and phase frequency resolution unit 416 can only be handled the signal of single signalling channel.At this moment, phase frequency resolution unit 416 can be given operation processing unit 46 in regular turn with the semaphore on each bar detection line.
Total the above; Because intensity/phase noise of phase frequency converter 415 itself is low; And the signal noise ratio of touch detection system 4 is high, so touch detection system 4 is can not need auxiliary as the extra digital analog converter of baseline, and the size of contact panel 44 can be middle large scale.In addition, the hardware cost of above-mentioned intensity/phase frequency converter 415 is low, and can reduce manufacturing cost by this.
Please with reference to Fig. 5, Fig. 5 is the equivalent function structural drawing of detecting electrode array control circuit when the touch-control instrument is active pointer that this new embodiment provides.When the touch-control instrument was active pointer 48, touch detection system 4 can equivalence be the touch detection system 5 of Fig. 5.At this moment, the driving signal generator 45 of Fig. 4 can be by forbidden energy, so can not come across Fig. 5.The detecting electrode array of the contact panel 44 of the touch detection system 5 of Fig. 5 is to be example with detection line S1, S2 and drive wire D1, D2.
The drive signal Driving_Sig of contact panel 44 is provided by active pointer 48, and each drive wire on the touching zone can produce corresponding drive wire signal DrvLine_Sig and detection signal Sensing_Sig in view of the above with each detection line.Multiplexer 42 according to control signal Control_Sig in regular turn with detection signal Sensing_S1 and Sensing_S2 timesharing give detecting electrode array control circuit 41; And multiplexer 43 with a plurality of drive wire signal DrvLine_D1 on a plurality of drive wires of contact panel 44 and DrvLine_D2 timesharing deliver to detecting electrode array control circuit 41, wherein detecting electrode array control circuit 41 is that timesharing ground receives a plurality of drive wire signal DrvLine_D1 and DrvLine_D2 and detection signal Sensing_S1 and Sensing_S2.
When contact surface plate 44 when active pointer 48 is not touched, do not have any drive signal.When active pointer 48 was opened and touched contact panel 44, active pointer 48 can provide drive signal Driving_Sig to the drive wire on its touching zone, and detection line also can produce corresponding detection signal because of the factor of field coupling simultaneously.If drive signal Driving_Sig is a string ripple signal, then detection signal in fact also is a string ripple signal.In view of the above, the detection signal of the detection line on the touching zone and the drive wire signal of drive wire are behind process low noise amplifier 411, after meeting converted into a plurality of strength signals by signal intensity resolver 412.Then, these strength signals are behind process commutation circuit 413 and programmable gain amplifier 414, and intensity/phase frequency converter 415 can produce corresponding phase frequency signal according to each strength signal.
Phase frequency resolution unit 416 receives the phase frequency signal of being changed by detection signal and drive wire signal, and resolves these phase frequency signals, to obtain the semaphore on each bar detection line or the drive wire.Operation processing unit 46 can be judged the change amount signal of said each bar detection line or drive wire according to each semaphore.
If contact panel 44 do not touched, frequency, phase place or frequency and the phase place of the phase frequency signal that is then produced according to drive wire signal DrvLine_D1, the DrvLine_D2 of detection signal Sensing_S1, Sensing_S2 and the drive wire D1 of detection line S1, S2, D2 are bigger.
Yet; When the touching zone is the formed zone of detection line S2 and drive wire D2; Then drive signal Driving_Sig can induce the string ripple at detection line S2; And drive wire D2 can receive drive signal Driving_Sig and produce drive wire signal DrvLine_D2, and therefore, the drive wire signal DrvLine_D2 of drive wire D2 and the detection signal Sensing_S2 of detection line S2 are string ripple signal.Thus; Frequency, phase place or frequency and the phase place of the phase frequency signal that is produced according to drive wire signal DrvLine_D2 and detection signal Sensing_S2 are less, thus operation processing unit 46 can learn detection line S2 and the formed zone of drive wire D2 be touch regional.
Be noted that when the touch-control instrument is active pointer intensity/phase frequency converter 415 is just opposite according to the mode that strength signal produces the phase frequency signal.In more detail; When the touch-control instrument is active pointer; If strength signal is bigger; Then frequency, phase place or frequency and the phase place of intensity/phase frequency signal that phase frequency converter 415 is produced are less, if strength signal is less, then frequency, phase place or frequency and the phase place of intensity/phase frequency signal that phase frequency converter 415 is produced are bigger.Thus, just need not change the mode in the judgement touching zone of operation processing unit 46.Yet this embodiment is not novel in order to limit this.In another kind of embodiment; Also can make intensity/phase frequency converter 415 produce the mode of phase frequency signal according to strength signal can be different because of the touch-control instrument; And different, at this moment, the mode that only need change the judgement touching zone of operation processing unit 46 gets final product.
Please with reference to Fig. 6, Fig. 6 is the equivalent function structural drawing of touch detection system when the touch-control instrument is passive type pointer or finger that this new embodiment provides.When the touch-control instrument was passive type pointer or finger, touch detection system 4 can equivalence be the touch detection system 6 of Fig. 6.The detecting electrode array of the contact panel 44 of the touch detection system 6 of Fig. 6 is to be example with detection line S1, S2 and drive wire D1, D2; So multiplexer 43 meeting output drive signal Driving_D1 and Driving_D2; Wherein drive signal Driving_D1 is the string ripple in time T 1, and drive signal Driving_D2 is the string ripple in time T 2.
If contact panel 44 is not touched, then the detection signal Sensing_S1 of detection line S1, S2, Sensing_S2 are the string ripple when time T 1 and T2.At this moment, frequency, phase place or frequency and the phase place of two phase frequency signals that produced according to detection signal Sensing_S1, Sensing_S2 when time point T1 and T2 is bigger.
When the touching zone was the formed zone of detection line S1 and drive wire D2, then the detection signal Sensing_S2 of detection line S2 was the string ripple when time T 1 and T2, and the detection signal Sensing_S1 of detection line S1 is the string ripple when time T 1.At this moment; Frequency, phase place or frequency and the phase place of the phase frequency signal that is produced according to detection signal Sensing_S2 when time point T1 and T2 is bigger, and frequency, phase place or frequency and the phase place of the phase frequency signal that is produced according to detection signal Sensing_S1 when time point T1 is bigger.Phase frequency resolution unit 416 can know that frequency, phase place or frequency and the phase place of phase frequency signal when time point T2 that is produced according to detection signal Sensing_S1 diminishes; Therefore, operation processing unit 46 can judge that to touch detection line S1 regional for touching with the formed zone of drive wire D2.
Please with reference to Fig. 7, Fig. 7 is the process flow diagram of the detecting electrode array control method that provides of this new embodiment.The detecting electrode array control method of Fig. 7 is used in the touch detection system of dual mode operation, and the instrument that touch detection system is used for touching can be user's finger, passive type pointer or active pointer.
At first in step S91, judge the type of the instrument that touch detection system is used for touching.If the instrument that is used for touching can be user's finger or passive type pointer, then execution in step S92.If the instrument that is used for touching can be user's finger or passive type pointer, then execution in step S93.
In step S92, the institute of the detecting electrode array control method of execution graph 8 in steps.In step S93, the institute of the detecting electrode array control method of execution graph 9 in steps.Step S91 judges the touch-control tool types according to the physical button switching signal, and in other words, user manually application entity button is switched the touch-control tool types.Yet, be noted that novel being not limited thereto.
Please with reference to Fig. 8, Fig. 8 is the process flow diagram of the step S92 of the detecting electrode array control method that provides of this new embodiment.The instrument that is used for touching when touch detection system is for user's finger or when the passive type pointer of any drive signal can be provided, and the driving signal generator in the touch detection system can provide many drive wires of a plurality of drive signals to contact panel.
At first, in step S71, receive the detection signal on many detection lines.Then, in step S72, convert a plurality of detection signals into be essentially d. c. voltage signal a plurality of strength signals, for example a plurality of detection signals are carried out the peak value detection or seal to detect obtaining a plurality of strength signals.What deserves to be mentioned is, before step S72, can also a plurality of detection signals carried out converting the detection signal after low noise amplifies into strength signal again after low noise amplifies.
Then, in step S73, produce a plurality of phase frequency signals according to a plurality of strength signals, wherein the phase place of each phase frequency signal, frequency or frequency can change along with the direct current quasi-position of its corresponding strength signal with phase place.Before step S73, can also a plurality of strength signals be amplified respectively, with a plurality of strength signals of generation after amplifying, and in step S73, can also produce a plurality of phase frequency signals according to a plurality of strength signals after amplifying.
Then, in step S74, resolve each phase frequency signal, to obtain the semaphore on the corresponding detection line.
Please with reference to Fig. 9, Fig. 9 is the process flow diagram of the step S93 of the detecting electrode array control method that provides of this novel another embodiment.The instrument that is used for touching when touch detection system is that active pointer can provide the contact panel of drive signal to touch detection system when the active pointer of drive signal can be provided.
At first, in step S81, receive a plurality of detection signals and a plurality of drive wire signals on many drive wires on many detection lines.Then; In step S82; With a plurality of detection signals and a plurality of drive wire conversion of signals is a plurality of strength signals that are essentially d. c. voltage signal, for example a plurality of detection signals and a plurality of drive wire signal is carried out the peak value detection or seal to detect obtaining a plurality of strength signals.What deserves to be mentioned is, before step S82, can also a plurality of detection signals and a plurality of drive wire signal be carried out after low noise amplifies, again the detection signal after low noise amplifies is changeed and the drive wire signal being changed to strength signal.
Then, in step S83, produce a plurality of phase frequency signals according to a plurality of strength signals, wherein the phase place of each phase frequency signal, frequency or frequency can change along with the direct current quasi-position of its corresponding strength signal with phase place.Before step S83, can also a plurality of strength signals be amplified respectively, with a plurality of strength signals of generation after amplifying, and in step S83, can also produce a plurality of phase frequency signals according to a plurality of strength signals after amplifying.Then, in step S84, resolve each phase frequency signal, to obtain corresponding detection line or the semaphore on the drive wire.
Please with reference to Figure 10, Figure 10 is the process flow diagram of the detecting electrode array control method that provides of this novel another embodiment.The detecting electrode array control method of Figure 10 is used in the touch detection system of dual mode operation, and the instrument that touch detection system is used for touching can be user's finger, passive type pointer or active pointer.
At first, in step S101, a plurality of detection signals that receive on many detection lines are followed, and in step S102, judge the type of the instrument that touch detection system is used for touching.If the instrument that is used for touching can be user's finger or passive type pointer, then execution in step S103.If the instrument that is used for touching can be user's finger or passive type pointer, then execution in step S104.Step S102 comes automatically to judge the touch-control tool types according to the difference of the operating frequency of drive signal and signal amplitude; For example; The frequency of the drive signal that active pointer provided is 1MHz, and the frequency of the drive signal that driving signal generator produced is 250KHz.Yet, be noted that the utility model is not limited thereto.
In step S103, receive the drive wire signal on many drive wires, and be other a plurality of strength signal the drive wire conversion of signals on many drive wires.What deserves to be mentioned is, before step S103, can also a plurality of drive wire signals carried out converting the detection signal after low noise amplifies into strength signal again after low noise amplifies.
In step S104, a plurality of detection signals are converted into a plurality of strength signals that are essentially d. c. voltage signal.In step S105, produce a plurality of phase frequency signals according to a plurality of strength signals, wherein the phase place of each phase frequency signal, frequency or frequency can change along with the direct current quasi-position of its corresponding strength signal with phase place.Before step S105, can also a plurality of strength signals be amplified respectively, with a plurality of strength signals of generation after amplifying, and in step S105, can also produce a plurality of phase frequency signals according to a plurality of strength signals after amplifying.Then, in step S106, resolve each phase frequency signal, to obtain corresponding detection line (or the semaphore on the drive wire).
Comprehensive above-mentioned explanation; Compared to traditional touch detection system, the signal noise of the touch detection system of the detecting electrode array control circuit that use the utility model embodiment is provided is bigger, and can not need use integrator; Therefore, its operating speed is also very fast.In addition; Use the touch detection system of the detecting electrode array control circuit that this new embodiment provides can not need to use digital analog converter as baseline; Just can effectively promote signal noise ratio, and the size of its contact panel can also be middle large scale.
The above is merely the embodiment of the utility model, and it is not the claim in order to limitation the utility model.
Claims (13)
1. a detecting electrode array control circuit is characterized in that, said detecting electrode array control circuit comprises:
The signal intensity resolver is according to the corresponding direct current signal as strength signal of detection signal acquisition of each the bar detection line on the detecting electrode array;
Intensity/phase frequency converter; Be connected in said signal intensity resolver; Produce corresponding phase frequency signal according to each said strength signal, wherein the frequency of each said phase frequency signal and phase place at least one of them be relevant to corresponding said strength signal certainly; And
The phase frequency resolution unit is connected in said intensity/phase frequency converter, obtains a semaphore of corresponding said detection line according to each said phase frequency signal.
2. detecting electrode array control circuit according to claim 1 is characterized in that said signal intensity resolver is peak detctor or seals detecting device.
3. detecting electrode array control circuit according to claim 1 is characterized in that said intensity/phase frequency converter is a voltage control oscillating circuit, and said phase frequency resolution unit is frequency counter or frequency discriminator.
4. detecting electrode array control circuit according to claim 1; It is characterized in that; Said intensity/phase frequency converter is phase modulator or phase place and frequency modulator, if said intensity/phase frequency converter is said phase modulator, then said phase frequency resolution unit is a phase demodulator; If said intensity/phase frequency converter is said phase place and frequency modulator, then said phase frequency resolution unit is phase place and frequency demodulator.
5. detecting electrode array control circuit according to claim 1; It is characterized in that; Said signal intensity resolver is the signal intensity resolver that can also obtain corresponding strength signal according to the drive wire signal of each the bar drive wire on the said detecting electrode array, and said phase frequency resolution unit is the phase frequency resolution unit that can also obtain a semaphore of corresponding said drive wire according to the phase frequency signal of each bar drive wire of said correspondence.
6. detecting electrode array control circuit according to claim 1 is characterized in that, said detecting electrode array control circuit also comprises:
Low noise amplifier; Be connected in said signal intensity resolver; Amplify in order to each said detection signal is carried out a low noise, wherein said signal intensity resolver receives each the said detection signal after said low noise amplifies, and produces corresponding said strength signal in view of the above.
7. detecting electrode array control circuit according to claim 1 is characterized in that, said detecting electrode array control circuit also comprises:
Commutation circuit is connected between said signal intensity resolver and intensity/phase frequency converter, in order to a plurality of said strength signals are delivered to a plurality of signalling channels; And
Programmable gain amplifier is connected in said commutation circuit, in order to adjusting the strength signal that each said signalling channel is transmitted, and said adjusted strength signal is passed to said intensity/phase frequency converting unit.
8. a touch detection system is characterized in that, said touch detection system comprises:
Contact panel has the detecting electrode array; And
Detecting electrode array control circuit is connected in said contact panel, and it comprises:
The signal intensity resolver is according to the corresponding direct current signal as strength signal of detection signal acquisition of each the bar detection line on the said detecting electrode array;
Intensity/phase frequency converter; Be connected in said signal intensity resolver; Produce a corresponding phase frequency signal according to each said strength signal, wherein the frequency of each said phase frequency signal and phase place at least one of them be relevant to corresponding said strength signal certainly; And
The phase frequency resolution unit is connected in said intensity/phase frequency converter, obtains a semaphore of corresponding said detection line according to each said phase frequency signal.
9. touch detection system according to claim 8 is characterized in that, wherein said signal intensity resolver is peak detctor or seals detecting device.
10. touch detection system according to claim 8 is characterized in that, wherein said intensity/phase frequency converter is a voltage control oscillating circuit, and said phase frequency resolution unit is frequency counter or frequency discriminator.
11. touch detection system according to claim 8 is characterized in that, said touch detection system also comprises:
Micro-control unit is connected in said phase frequency resolution unit, judges the touching zone that the change amount signal of each said detection line is touched on said contact panel with the decision user according to the semaphore that said phase frequency resolution unit is produced.
12. touch detection system according to claim 11; It is characterized in that; Said detecting electrode array control circuit is the control circuit that is applicable to the touch detection system of plural mould operation, and it is finger or the passive type pointer that the active pointer of said drive signal, said user are provided that wherein said micro-control unit is judged in order to the instrument of touching said contact panel.
13. touch detection system according to claim 12; It is characterized in that; When in order to the instrument of touching said touch detection system being said user's finger or passive type pointer; Said micro-control unit provides the micro-control unit that a plurality of drive signals are given many drive wires of said contact panel; When said instrument for when the active pointer of said drive signal to be provided, said signal intensity resolver is the signal intensity resolver that can also obtain corresponding strength signal according to the drive wire signal of the said drive wire of each bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202805172U CN202171792U (en) | 2011-07-29 | 2011-07-29 | Detection electrode array control circuit and touch-control detection system with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202805172U CN202171792U (en) | 2011-07-29 | 2011-07-29 | Detection electrode array control circuit and touch-control detection system with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202171792U true CN202171792U (en) | 2012-03-21 |
Family
ID=45829985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202805172U Expired - Lifetime CN202171792U (en) | 2011-07-29 | 2011-07-29 | Detection electrode array control circuit and touch-control detection system with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202171792U (en) |
-
2011
- 2011-07-29 CN CN2011202805172U patent/CN202171792U/en not_active Expired - Lifetime
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102915138B (en) | Sensor electrode array control circuit, control method and touch-control sensing system thereof | |
| CN102902393B (en) | Detecting electrode Array Control Circuit, control method and touch detection system thereof | |
| US9933904B2 (en) | Capacitive touch system | |
| US10444892B2 (en) | Capacitance measurement device with reduced noise | |
| CN102844669B (en) | Noise suppression circuit and method for capacitive sensing system | |
| CN102622144B (en) | Demodulation method and system for low-power differential detection capacitive touch control | |
| CN101685364B (en) | Device and method for sensing touch panel | |
| CN202177879U (en) | Sensor electrode array control circuit and touch sensing system thereof | |
| CN202171792U (en) | Detection electrode array control circuit and touch-control detection system with same | |
| CN203535119U (en) | Capacitance detection circuit | |
| KR101421464B1 (en) | Control system of a touch panel and a control method thereof | |
| CN102760015A (en) | Noise filtering method for capacitive touch panel | |
| CN221529169U (en) | Capacitance detection circuit, electronic chip, electronic device and display device | |
| CN102857193A (en) | Multichannel integral circuit module, multichannel circuit module group and spectrometer | |
| CN109407867A (en) | Touch detection system and its detection method, touch device | |
| CN100403020C (en) | Chemical radar scanner and its electrochemical frequency amplitude response spectra analysis method | |
| CN202205179U (en) | Control system of touch control panel | |
| WO2019109750A1 (en) | Operation recognition apparatus, operation recognition method, and smart terminal having the apparatus | |
| CN117519518A (en) | Capacitance detection circuit, electronic chip, electronic device and display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120321 Effective date of abandoning: 20151125 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |