CN105610422A - Touch sensing system - Google Patents
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- CN105610422A CN105610422A CN201410657890.3A CN201410657890A CN105610422A CN 105610422 A CN105610422 A CN 105610422A CN 201410657890 A CN201410657890 A CN 201410657890A CN 105610422 A CN105610422 A CN 105610422A
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Abstract
A touch sensing system comprises a signal generator, a touch sensing signal generator, a reference signal generator and a processing module, wherein the touch sensing signal generator is composed of switches, a first constant current source, a first touch pad and a touch comparator, and the reference signal generator is composed of switches, a second constant current source, a second touch pad and a reference comparator. The signal generator transmits an input signal to the switches, the first and second constant current sources charge the first and second touch pads respectively when the switches are switched on, and the touch comparator and the reference comparator each transmit a high-level signal to the processing module when a reference voltage is achieved. When the first touch pad is touched or not touched, the touch comparator outputs a first high-level signal after a first delay time or a second delay time, and the reference comparator outputs a second high-level signal after a third delay time. The processing module outputs a touch result based on the delay time.
Description
Technical field
The present invention has about a kind of touch-control sensing system, and espespecially one utilizes constant current source to charge it to touch padTouch-control sensing system.
Background technology
Along with science and technology progress with rapid changepl. never-ending changes and improvements, the prosperity at networking has made various electronic installations be flooded with people's lifeLive, and electronic installation is now all taking touch as main, and all needs, through test, to make at touch circuitIn fact being applied on electronic installation can be comparatively smooth-going and be not easy to go wrong.
And existing touch circuit is as the patent document of No. 200701639th, patent publication No., refers to figure1, Fig. 1 shows the block schematic diagram of the touch-control sensing system of prior art, as shown in Figure 1, and existing touch-controlFormula circuit PA1 comprise an input signal generator PA11, multiple touch induced signal generator PA12,PA13 (only indicating one in figure), multiple variable delay element PA14 (only indicating in figure), multiple DType flip-flop PA15 and a controller PA16.
But, as shown in Figure 1, touch induced signal generator PA12, PA13 be mainly by resistance andElectric capacity (having electric capacity in touch pad) forms, but this design easily makes signal wave with temperature and voltageAnd cause the situation of shakiness, and then make easily to have the problem of erroneous judgement in the time that whether sensing has touch-control.
Summary of the invention
Because the signal of existing touch circuit easily waves and causes shakiness with temperature and voltageSituation, thereby generally there is the problem of touch-control erroneous judgement. Edge this, the present invention mainly provides a kind of touch-control sensingSystem, it mainly replaces original resistance with current source, and then solves the problem of prior art.
For achieving the above object, the application provides a kind of touch-control sensing system, comprises: a signal generator,In order to produce an input signal; At least one touch-control sensing signal generator, is electrically connected at this signal generator,And comprise: one first constant current source, in order to provide one first to determine electric current; One first switch, is electrically connected atThis first constant current source and this signal generator, in order to receive this input signal, so as to according to this input signalOpen or close; One second switch, is electrically connected at this first constant current source and this signal generator, in order toReceive this input signal, so as to opening or close according to this input signal; One first touch pad, is electrically connectedIn this first constant current source, this first switch and this second switch, and in order to touch-control; An and touch-control comparisonDevice, has one first input point and one second input point, and this first input point receives one first reference voltage,This second input point is electrically connected at this first constant current source, this first switch, this second switch and thisOne touch pad, in order to export one first electronegative potential output signal; Make this at this input signal in a very first timeThe first switch open also closes this second switch, and this first touch pad is during by touch-control, and this first determines electric currentTo the charging of this first touch pad, make this touch-control comparator through one first time delay and in one second time from shouldThe first electronegative potential output signal is converted to output one first high potential output signal; This input signal in thisFor the moment this first switch open of chien shih this second switch is closed, and this first touch pad is during by touch-control,This first determines electric current to the charging of this first touch pad, makes this touch-control comparator through one second time delay and in oneThe 3rd time was converted to this first high potential output signal of output from this first electronegative potential output signal; One referenceSignal generator, comprises: one second constant current source, in order to provide one second to determine electric current; One the 3rd switch,Be electrically connected at this second constant current source and this signal generator, in order to receive this input signal, so as to foundationThis input signal is opened or is closed; One the 4th switch, is electrically connected at this second constant current source and this signal and producesRaw device, in order to receive this input signal, so as to opening or cut out according to this input signal; One second touch pad,Be electrically connected at this second constant current source, the 3rd switch and the 4th switch, and second determine electric current and fill for thisElectricity; And a reference comparator, thering is one the 3rd input point and one the 4th input point, the 3rd input point connectsReceive one second reference voltage, the 4th input point be electrically connected at this second constant current source, the 3rd switch,The 4th switch and this second touch pad, in order to export one second electronegative potential output signal; At this input letterNumber in the time that this very first time makes the 3rd switch open and the 4th switch cuts out, this second determines electric current to thisThe second touch pad charging, make this reference comparator through one the 3rd time delay and in one the 4th time from this secondElectronegative potential output signal is converted to output one second high potential output signal; And a processing module, electrically connectBe connected to this touch-control comparator and this reference comparator, in order to receive this second high potential output signal, and useTo receive the one in this first electronegative potential output signal and this first high potential output signal, should so as to foundationOne and this second high potential in the first electronegative potential output signal and this first high potential output signal are defeatedGo out signal and export at least one touch-control result; Wherein, be greater than for the 3rd time delay this first time delay, shouldBe less than for the 3rd time delay the second time delay.
Above-mentioned touch-control sensing system, this first switch and the 3rd switch are a PMOS switch, this is second years oldSwitch and the 4th switch are a nmos switch.
Above-mentioned touch-control sensing system, this second touch pad is one of in a fixed capacity and a tunable capacitorPerson.
Above-mentioned touch-control sensing system, this second current value of determining electric current is greater than this first electric current of determining electric currentValue, and be this first multiple of determining the current value of electric current.
Above-mentioned touch-control sensing system, this processing module comprises:
One first latch unit, is electrically connected at this touch-control comparator and this reference comparator, in order to receive thisOne in one electronegative potential output signal and this first high potential output signal, and according to this reference comparator instituteThis this first electronegative potential output signal of the second high potential output signal control and this first high potential of output are defeatedGo out signal output; And
One controller, is electrically connected at this first latch unit and this reference comparator, first low in order to receive thisOne in current potential output signal and this first high potential output signal and this second high potential output signal,And according to the one in this first electronegative potential output signal and this first high potential output signal and this secondHigh potential output signal is exported at least one touch-control result.
Above-mentioned touch-control sensing system, this controller is one of in a microprocessing unit and digital signal processorPerson.
Above-mentioned touch-control sensing system, this processing module more comprises a digital delay, this digital delay electricityProperty is connected between this reference comparator, this first latch unit and this controller, in order to receive this second heightCurrent potential output signal, so as to trigger according to this second high potential output signal this first latch unit export this firstOne in electronegative potential output signal and this first high potential output signal, and by this second high potential output letterNumber export this controller to.
Above-mentioned touch-control sensing system, this digital delay comprises:
At least one the second latch unit, is electrically connected at this reference comparator and this controller, in order to receive thisTwo high potential output signals and this controller one of send out delayed control signal, so as to making this controller controlMake this second latch unit and export a delay output signal according to this second high potential output signal; And
One multiplexer, is electrically connected at this reference comparator, this first latch unit, this second latch unit and is somebody's turn to doController, this second high potential output signal and this second door bolt that transmit in order to receive this reference comparatorLock this delay output signal that device sent out, so as to comprising work more than this second high potential output signal by oneProcessing signals is sent to this first latch unit and this controller.
Above-mentioned touch-control sensing system, this first latch unit and this second latch unit are D type flip-flop.
After technical way by the touch-control sensing system that the present invention adopted, owing to adopting constant current sourceTo touch pad charging, therefore, can't cause along with the variation of temperature or voltage the situation of swinging of signal,Therefore the judgement of touch-control be not easy the wrong situation of sentencing and promote the stability of judgement in practice.
Specific embodiment of the present invention, will do further saying by following embodiment and accompanying drawingBright.
Brief description of the drawings
Fig. 1 is the block schematic diagram of the touch-control sensing system of demonstration prior art;
Fig. 2 is the block schematic diagram of the touch-control sensing system of demonstration preferred embodiment of the present invention;
The first touch pad that Fig. 3 is the touch-control sensing system of demonstration preferred embodiment of the present invention is by the waveform of touch-controlSchematic diagram; And
The first touch pad that Fig. 4 is the touch-control sensing system of demonstration preferred embodiment of the present invention is not by the ripple of touch-controlShape schematic diagram.
Wherein, Reference numeral:
PA1 touch circuit PA11 input signal generator
PA12, PA13 touch induced signal generator
PA14 variable delay element PA15D type flip-flop
PA16 controller 1 touch-control sensing system
11 signal generator 12 touch-control sensing signal generators
121 first constant current source 122 first switches
123 second switch 124 first touch pads
125 touch-control comparator 1,251 first input points
1252 second input point 13 reference signal generators
131 second constant current source 132 the 3rd switches
133 the 4th switch 134 second touch pads
135 reference comparator 1351 the 3rd input point
1352 the 4th input point 14 processing modules
141 first latch unit 142 controllers
143 digital delay 1,431 second latch units
1432 multiplexer I1 first determine electric current
I2 second determines electric current S1 input signal
S2 first electronegative potential output signal S3 the first high potential output signal
S4 second electronegative potential output signal S5 the second high potential output signal
S6 delayed control signal S7 delay output signal
S8 multiplex's processing signals S9 touch-control result
V1 first reference voltage V2 the second reference voltage
The second time delay of T1 T2 the first time delay
The 3rd t1 very first time time delay of T3
The 4th time of t2 the second time t3
The 3rd time of t4 t5 time delay
Detailed description of the invention
Due to touch-control sensing system provided by the present invention, its combination embodiment is too numerous to enumerate, therefore at this notRepeat one by one again, only enumerate a preferred embodiment and illustrated.
Refer to Fig. 2, Fig. 2 shows the block schematic diagram of the touch-control sensing system of preferred embodiment of the present invention. AsShown in Fig. 2, the touch-control sensing system of preferred embodiment of the present invention comprises a signal generator 11, a touch-control senseInduction signal generator 12 (can be multiplely, for example, in Fig. 2, represents to have many with three stains in other embodimentIndividual touch-control sensing signal generator 12), a reference signal generator 13 and a processing module 14.
Signal generator 11 can be has the signal generator that produces clock signal or AC signal, and above-mentionedClock signal can be 0 and 1 signal, or voltage valley is 0 and voltage cutting edge of a knife or a sword value is the signal of a fixed voltage.
Touch-control sensing signal generator 12 comprises one first constant current source 121, one first switch 122, one secondSwitch 123, one first touch pad 124 and a touch-control comparator 125. The first constant current source 121 can provide oneFirst determines electric current I 1, the first switch 122 is electrically connected at the first constant current source 121 and letter with second switch 123Number generator 11, and the first switch 122 is PMOS switch, second switch 123 is nmos switch.
The first touch pad 124 is electrically connected at the first constant current source 121, the first switch 122 and second switch123, and use for operating personnel and utilize a touch control object (for example finger, pointer etc. have the thing of electric capacity)Carry out touch-control, in addition, generally speaking the first touch pad 124 has electric capacity, and the first touch pad 124 is viaOne constant current source 121 is electrically connected at the first switch 122.
Touch-control comparator 125 has one first input point 1251 and one second input point 1252, the first input points1251 receive one first reference voltage V1, and the first reference voltage V1 is depending on the design in practice, and secondInput point 1252 is electrically connected at the first constant current source 121, the first switch 122, second switch 123 andOne touch pad 124, specifically, the second input point 1252 is electrically connected at via the first constant current source 121One switch 122.
Reference signal generator 13 comprises one second constant current source 131, one the 3rd switch 132, one the 4th switch133, one second touch pad 134 and a reference comparator 135. The second constant current source 131 is in order to provide oneTwo determine electric current I 2, determine the current value of electric current I 1, and be and the second current value of determining electric current I 2 is generally greater than firstFirst determines the multiple of the current value of electric current I 1, and specifically, above-mentioned multiple can produce according to touch-control sensing signalGive birth to the quantity of device 12 and determine, for example, ought have two touch-control sensing signal generators 12 can be set as 2 times, threeBe 3 times, and above-mentioned multiple can be determined according to the capacitance size of the second touch pad 134 and the first touch padFixed, but be not limited to this, also can be 1.5 times of equimultiple relations, it is depending on the design of practice. In addition, itsIn he embodiment, also can make the second current value of determining electric current I 2 be less than first and determine the current value of electric current I 1, it looks realityThe design of business and determining.
The 3rd switch 132 and the 4th switch 133 are electrically connected at the second constant current source 131 and signal generator11, the three switches 132 are PMOS switch, and the 4th switch 133 is nmos switch. The second touch pad 134Be electrically connected at the second constant current source 131, the 3rd switch 132 (is via the second constant current source 131 specificallyBe electrically connected at the 3rd switch 132) with the 4th switch 133, and determine electric current I 2 and charge for second, and second is tactileControl pad 134 is the one in a fixed capacity and a tunable capacitor, that is to say the second touch pad 134Be actually electric capacity, but preferably can be for adjusting capacitance, to take mutually with the second current value of determining electric current I 2Join.
Reference comparator 135 has one the 3rd input point 1351 and one the 4th input point 1352, the three input points1351 receive one second reference voltage V2, and the second reference voltage V2 is depending on the design in practice, for exampleCan be more than or equal to the first reference voltage V1. The 4th input point 1352 is electrically connected at the second constant current source131, the 3rd switch 132, the 4th switch 133 and the second touch pad 134, and the 4th input point 1352 viaThe second constant current source 131 is electrically connected at the 3rd switch 132.
Processing module 14 is electrically connected at touch-control comparator 125 and reference comparator 135, specifically, locatesReason module 14 comprises one first latch unit 141, a controller 142 and digital delay 143, the first breech locksDevice 141 is electrically connected at touch-control comparator 125 and reference comparator 135, and the first latch unit 141 be D type just(the D end of the first latch unit 141 is electrically connected at touch-control comparator 125 to anti-device, and CLK holds through digital delay143 are electrically connected at reference comparator 135, and Q end is electrically connected at controller 142).
Controller 142 is microprocessing unit (MicroControlUnit, MCU) and a digital signal processorOne in (DigitalSignalProcessor, DSP), is electrically connected at the first latch unit 141, and electricityProperty is connected in reference comparator 135.
Specifically, controller 142 is electrically connected at reference comparator 135 via digital delay 143,Digital delay 143 comprises at least one the second latch unit 1431 (other embodiment can be multiple) and more than oneMultiplexer 1432. The second latch unit 1431 is D type flip-flop, and is electrically connected at reference comparator 135 and control(D end is electrically connected at reference comparator 135 to device 142 processed, and CLK end is electrically connected at controller 142, Q endBe electrically connected at multiplexer 1432). Multiplexer 1432 is electrically connected at reference comparator 135, the first latch unit141, the second latch unit 1431 and controller 142, that is receive reference comparator 135 and the second breech lock simultaneouslyThe input of device 1431, so as to exporting the first latch unit 141 (exporting the CLK end of the first latch unit 141 to) toWith controller 142.
In addition, need one to carry at this, when digital delay 143 includes multiple the second latch units 1431Time, the Q end of the second latch unit 1431 is all the D end input that is electrically connected to another latch unit, and controller142 connect the CLK end that is electrically connected at latch unit, so as to the time of control lag.
Below will illustrate respectively the first touch pad 124 by touch-control with not by the situation of touch-control, below first illustrate theOne touch pad 124, by the situation of touch-control, sees also Fig. 2 and Fig. 3, and Fig. 3 shows the better enforcement of the present inventionThe first touch pad of the touch-control sensing system of example is by the waveform schematic diagram of touch-control. As shown in the figure, signal generator11 send out one for the input signal S1 (as the waveform of Fig. 3 the top) of clock signal, and touch-control sensing signal producesThe first switch 122 and the second switch 123 of raw device 12 are opened or are closed and (that is lead according to input signal S1Lead to or not conducting).
Wherein, in the moment of very first time t1, touch-control comparator 125 continues output one first electronegative potential outputSignal S2, and input signal S1 is down to electronegative potential (High drops to Low) from high potential, makes the first switch122 unlatchings (conducting) and second switch 123 are closed (ending and not conducting), and at the first touch pad 124During by touch-control, first determine electric current I 1 to the electric capacity in the first touch pad 124 and touch-control in the first touch pad 124On touch control object (be assumed to be finger, can be considered electric capacity) charging, and then make the of touch-control comparator 125The voltage of two input points 1252 gradually rise (as in Fig. 3 by as shown in upper several lower second oscillogram), and when theWhen the voltage of two input points 1252 reaches the first reference voltage V1, can make touch-control comparator 125 export one firstHigh potential output signal S3 (as in Fig. 3 by as shown in upper several lower the 3rd oscillograms), and in the better reality of the present inventionExecute in example, the voltage of the second input point 1252 just arrives the first reference voltage V1 in the time of one second time t2, because ofThis touch-control comparator 125 through one first time delay T1 be converted to output from the first electronegative potential output signal S2The first high potential output signal S3, and this value that the first time delay, T1 was t2-t1.
In addition, input signal S1 can be sent to the 3rd switch 132 and of reference signal generator 13 equallyFour switches 133, similarly, in the moment of very first time t1, it is low that reference comparator 135 continues output one secondCurrent potential output signal S4, and input signal S1 is down to electronegative potential (High drops to Low) from high potential, makesThe 3rd switch 132 is opened (conducting) and the 4th switch 133 cuts out (ending and not conducting), and second determines electric currentI2 is to the capacitor charging in the second touch pad 134, and then makes the 4th input point 1352 of reference comparator 135Voltage gradually rise (as in Fig. 3 by as shown in upper several lower the 4th oscillograms), and when the 4th input point 1352Voltage while reaching the second reference voltage V2, can make reference comparator 135 export one second high potential output letterNumber S5 (as in Fig. 3 as shown in the oscillogram of below), and in preferred embodiment of the present invention, the 4th input point1352 voltage just arrives the second reference voltage V2 in the time of the 4th time t3, and therefore reference comparator 135 is through oneThe 3rd time delay T3 be converted to output the second high potential output letter from output the second electronegative potential output signal S4Number S5, and this 3rd value that time delay, T3 was t3-t1.
In addition, can be well understood to by Fig. 3, because the first touch pad 124 has by touch-control, therefore first is fixedElectric current I 1 is slower to the charging of the first touch pad 124, make first time delay T1 be greater than for the 3rd time delayT3, and in preferred embodiment of the present invention, must make the 3rd time delay T3 be less than first time delay T1,It can determine electric current I 2 and second by second of the second constant current source 131 of adjustment reference signal generator 13The capacitance of touch pad 134 reaches this object.
Wherein, in preferred embodiment of the present invention, processing module 14 is receiving the first high potential output signal S3And second after high potential output signal S5, can according to first time delay T1 and the 3rd time delay T3 itOne first difference, exports at least one touch-control result S9.
Specifically, the first high potential output signal S3 is exporting to after the first latch unit 141, the first breech lockThe first breech lock of device 141 lives in the first high potential output signal S3 and is not sent out, defeated to wait for reception the second high potentialGo out signal S5 or include the signal of the second high potential output signal S5.
Furthermore, the second high potential output signal S5 is sent to after the second latch unit 1431, the second breech lockDevice 1431 receives the second high potential output signal S5 and controller 142 and one of sends out delayed control signalS6, so as to making controller 142 control the second latch unit 1431 according to the second high potential output signal S5 output one(the in general instantaneous trigger output to high potential by electronegative potential, therefore only needs control to delay output signal S7Clock pulse processed), and above-mentioned delayed control signal S6 can make the second latch unit 1431 lingeringly export above-mentionedDelay output signal S7. The second high potential output that multiplexer 1432 is transmitted in reception reference comparator 135The delay output signal S7 that signal S5 and the second latch unit 1431 are sent out, so as to processing and comprising oneMore than the second high potential output signal S5, work processing signals S8 is sent to the first latch unit 141 and controller 142.
Receive after multiplex's processing signals S8 at the first latch unit 141 (equally can be as Fig. 3 as shown in below itThe signal to high potential from electronegative potential of oscillogram, that is to say, multiplex's processing signals S8 can be second actuallyHigh potential output signal S5, difference be to postpone output), directly by straight the first high potential output signal S3Connect and export controller 142 to, make controller 142 can according to first time delay T1 and the 3rd time delayThe first difference of T3 is exported at least one touch-control result S9, and in this explanation, touch-control result S9 is expressed as" there is touch-control ", and in the time having multiple touch-control sensing signal generator 12, just have multiple touch-control result S9.
In addition, need one to carry at this, in the above description, while making multiplexer 1432 be delayed to a delayBetween t4 just multiplex's processing signals S8 is sent to the first latch unit 141 and controller 142, just make controller142 can direct basis T1 the first time delay and the 3rd time delay T3 the first difference be confirmed whetherTouch-control. And in other embodiments, owing to can not thering is digital delay 143, therefore reference comparator 135In the time of the 4th time t3, directly export the second high potential output signal S3 to first latch unit 141, and then makeThe first latch unit 141 directly by the first electronegative potential output signal S2 (due to the electricity of the second input point 1252 nowPress and also do not reach the first reference voltage V1, therefore the first electronegative potential output signal S2 is electronegative potential) export toController 142, and known the first electronegative potential output signal S2 of controller 142 is electronegative potential, the second high potential is defeatedGoing out signal S3 is high potential, and then can judge now represent it is to have touch-control.
See also Fig. 2 and Fig. 4, Fig. 4 show preferred embodiment of the present invention touch-control sensing systemOne touch pad is not by the waveform schematic diagram of touch-control. As shown in the figure, signal generator 11 sends out input letter equallyNumber S1 (as the waveform of Fig. 4 the top), and in the moment of very first time t1, touch-control comparator 125 continues defeatedGo out one first electronegative potential output signal S2, input signal S1 is down to electronegative potential from high potential, and (High drops toLow), make the first switch 122 open (conducting) and second switch 123 is closed (cut-off and not conducting),And during not by touch-control, first determines electric current I 1 directly to the electric capacity in the first touch pad 124 at the first touch pad 124Charging, so make the voltage of the second input point 1252 of touch-control comparator 125 gradually increase (as in Fig. 4 byShown in upper several lower second oscillogram, and rate of voltage rise when by touch-control soon), and when theWhen the voltage of two input points 1252 reaches the first reference voltage V1, can make touch-control comparator 125 export the first heightCurrent potential output signal S3 (as in Fig. 4 by as shown in upper several lower the 3rd oscillograms), and in the better enforcement of the present inventionIn example, the voltage of the second input point 1252 just arrives the first reference voltage V1 in the time of the 3rd time t5, therefore touchesControl comparator 125 through one second time delay T2 export the first high potential output signal S3, and this second postponeThe value that time T 2 is t5-t1.
In addition, input signal S1 can be sent to the 3rd switch 132 and of reference signal generator 13 equallyFour switches 133, similarly, in the moment of very first time t1, it is low that reference comparator 135 continues output one secondCurrent potential output signal S4, and the 3rd switch 132 is opened (conducting) and the 4th switch 133 close (cut-off and notConducting), second determines electric current I 2 to the capacitor charging in the second touch pad 134, and then makes reference comparator 135The voltage of the 4th input point 1352 gradually rise (as in Fig. 3 by as shown in upper several lower the 4th oscillograms), andIn the time that the voltage of the 4th input point 1352 reaches the second reference voltage V2, can make touch-control comparator 125 export oneThe second high potential output signal S3 (as in Fig. 3 as shown in the oscillogram of below), and in the better enforcement of the present inventionIn example, the voltage of the 4th input point 1352 equally in the time of the 4th time t3 (identical with the situation of Fig. 3) just arriveReach the second reference voltage V2, therefore reference comparator 135 through the 3rd time delay T3 to export the second high potential defeatedGo out signal S5, and this 3rd value that time delay, T3 was t3-t1.
In addition, can be well understood to by Fig. 4, because the first touch pad 124 is not by touch-control, therefore first is fixedElectric current I 1 is very fast to the charging of the first touch pad 124, make second time delay T2 be less than for the 3rd time delayT3, and be less than Fig. 3 first time delay T1, and in preferred embodiment of the present invention, must make the 3rd delayTime T 3 be greater than second time delay T2, and the 3rd time delay T3 be also less than first time delay T1, itsCan determine electric current I 2 and second by second of the second constant current source 131 of adjustment reference signal generator 13 touchesThe capacitance of control pad 134 reaches this object.
Processing module 14 is receiving the first electronegative potential output signal S2 and the second high potential output signal S5After, can according to second time delay T2 and the 3rd time delay one of T3 the second difference, export at least one touchingControl result S9.
Specifically, the first high potential output signal S3 is exporting to after the first latch unit 141, the first breech lockThe first breech lock of device 141 lives in the first high potential output signal S3 and is not sent out, defeated to wait for reception the second high potentialGo out signal S5 or include the signal of the second high potential output signal S5.
Furthermore, the second high potential output signal S5 is sent to after the second latch unit 1431, the second breech lockDevice 1431 receives the second high potential output signal S5 and controller 142 and one of sends out delayed control signalS6, so as to making controller 142 control the second latch unit 1431 according to the second high potential output signal S5 output one(the in general instantaneous trigger output to high potential by electronegative potential, therefore only needs control to delay output signal S7Clock pulse processed), and above-mentioned delayed control signal S6 can make the second latch unit 1431 lingeringly export above-mentionedDelay output signal S7. The second high potential output that multiplexer 1432 is transmitted in reception reference comparator 135The delay output signal S7 that signal S5 and the second latch unit 1431 are sent out, so as to processing and comprising oneMore than the second high potential output signal S5, work processing signals S8 is sent to the first latch unit 141 and controller 142.
Receive after multiplex's processing signals S8 at the first latch unit 141, directly by the first high potential output signalS2 directly exports controller 142 to, make controller 142 can according to second time delay T2 and the 3rd delayThe second difference of time T 3 is exported at least one touch-control result S9, and in this explanation, touch-control result S9 tableBe shown " not by touch-control ", and in the time having multiple touch-control sensing signal generator 12, just have multiple touch-control knotsFruit S9.
In addition, need one to carry at this, in the above description, make multiplexer 1432 be delayed to time delayT4 is just sent to multiplex's processing signals S8 the first latch unit 141 and controller 142, just makes controller 142Can direct basis T2 the second time delay and the 3rd time delay T3 the second difference be confirmed whether tactileControl. And in other embodiments, owing to can not thering is digital delay 143, therefore reference comparator 135In the time of the 4th time t3, directly export the second high potential output signal S5 to first latch unit 141, and then makeThe first latch unit 141 directly by the first high potential output signal S3 (due to the electricity of the second input point 1252 nowPress and reached the first reference voltage V1) export controller 142 to, and known the first high potential of controller 142Output signal S2 is high potential, and the first high potential output signal S3 is high potential, and then can judge now tableShow it is not by touch-control.
In addition, close and second switch 123 is opened and the 3rd switch 132 cuts out and at the first switch 122Under the situation that four switches 133 are opened, make respectively the first touch pad 124 and the second touch pad 134 discharge respectively.
Comprehensively the above, adopting after touch-control sensing system provided by the present invention, owing to adopting constant current sourceTo touch pad charging, therefore, can't cause along with the variation of temperature or voltage the situation of swinging of signal,Therefore the judgement of touch-control be not easy the wrong situation of sentencing and promote the stability of judgement in practice.
By the detailed description of above preferred embodiment, hope can be known the feature and essence of describing the present invention moreGod, and not with above-mentioned disclosed preferred embodiment, the present invention's category is limited. On the contraryGround, its objective is that hope can contain the patent of being arranged in of various changes and tool equality institute of the present invention wish applicationIn the category of scope.
Claims (9)
1. a touch-control sensing system, is characterized in that, comprises:
One signal generator, in order to produce an input signal;
At least one touch-control sensing signal generator, is electrically connected at this signal generator, and comprises:
One first constant current source, in order to provide one first to determine electric current;
One first switch, is electrically connected at this first constant current source and this signal generator, in order to receiveThis input signal, so as to opening or close according to this input signal;
One second switch, is electrically connected at this first constant current source and this signal generator, in order to receiveThis input signal, so as to opening or close according to this input signal;
One first touch pad, is electrically connected at this first constant current source, this first switch and this second and opensClose, and in order to touch-control; And
One touch-control comparator, has one first input point and one second input point, and this first input point connectsReceive one first reference voltage, this second input point be electrically connected at this first constant current source, this first switch,This second switch and this first touch pad, in order to export one first electronegative potential output signal; At this input letterNumber make this first switch open and this second switch is closed in a very first time, and this first touch pad is touchedWhen control, this first determines electric current to the charging of this first touch pad, makes this touch-control comparator through one first time delayAnd be converted to output one first high potential output signal in one second time from this first electronegative potential output signal;Make this first switch open and this second switch closed in this very first time at this input signal, and this firstTouch pad is during by touch-control, and this first determines electric current to this first touch pad charging, makes this touch-control comparator through oneThe second time delay and in one the 3rd time from this first electronegative potential output signal be converted to output this first heightCurrent potential output signal;
One reference signal generator, comprises:
One second constant current source, in order to provide one second to determine electric current;
One the 3rd switch, is electrically connected at this second constant current source and this signal generator, in order to receiveThis input signal, so as to opening or close according to this input signal;
One the 4th switch, is electrically connected at this second constant current source and this signal generator, in order to receiveThis input signal, so as to opening or close according to this input signal;
One second touch pad, is electrically connected at this second constant current source, the 3rd switch and the 4th is openedClose, and for this second constant-current charge; And
One reference comparator, has one the 3rd input point and one the 4th input point, and the 3rd input point connectsReceive one second reference voltage, the 4th input point be electrically connected at this second constant current source, the 3rd switch,The 4th switch and this second touch pad, in order to export one second electronegative potential output signal; At this input letterNumber in the time that this very first time makes the 3rd switch open and the 4th switch cuts out, this second determines electric current to thisThe second touch pad charging, make this reference comparator through one the 3rd time delay and in one the 4th time from this secondElectronegative potential output signal is converted to output one second high potential output signal; And
One processing module, is electrically connected at this touch-control comparator and this reference comparator, in order to receive thisTwo high potential output signals, and in order to receive this first electronegative potential output signal and this first high potential output letterOne in number, so as to according to one of in this first electronegative potential output signal and this first high potential output signalPerson and this second high potential output signal are exported at least one touch-control result;
Wherein, be greater than for the 3rd time delay this first time delay, be less than the 3rd this second time delayTime delay.
2. touch-control sensing system as claimed in claim 1, is characterized in that this first switch and the 3rdSwitch is a PMOS switch, and this second switch and the 4th switch are a nmos switch.
3. touch-control sensing system as claimed in claim 1, is characterized in that, this second touch pad is one solidDetermine the one in electric capacity and a tunable capacitor.
4. touch-control sensing system as claimed in claim 1, is characterized in that, this second electric current of determining electric currentValue is greater than this and first determines the current value of electric current, and is this first multiple of determining the current value of electric current.
5. touch-control sensing system as claimed in claim 1, is characterized in that, this processing module comprises:
One first latch unit, is electrically connected at this touch-control comparator and this reference comparator, in order to receive thisOne in one electronegative potential output signal and this first high potential output signal, and according to this reference comparator instituteThis this first electronegative potential output signal of the second high potential output signal control and this first high potential of output are defeatedGo out signal output; And
One controller, is electrically connected at this first latch unit and this reference comparator, first low in order to receive thisOne in current potential output signal and this first high potential output signal and this second high potential output signal,And according to the one in this first electronegative potential output signal and this first high potential output signal and this secondHigh potential output signal is exported at least one touch-control result.
6. touch-control sensing system as claimed in claim 5, is characterized in that, this controller is a micro-processingOne in unit and digital signal processor.
7. touch-control sensing system as claimed in claim 5, is characterized in that, this processing module more comprises oneDigital delay, this digital delay is electrically connected at this reference comparator, this first latch unit and this controlBetween device processed, in order to receive this second high potential output signal, so as to according to this second high potential output signalTrigger this first latch unit and export in this first electronegative potential output signal and this first high potential output signal itOne, and export this second high potential output signal to this controller.
8. touch-control sensing system as claimed in claim 7, is characterized in that, this digital delay comprises:
At least one the second latch unit, is electrically connected at this reference comparator and this controller, in order to receive thisTwo high potential output signals and this controller one of send out delayed control signal, so as to making this controller controlMake this second latch unit and export a delay output signal according to this second high potential output signal; And
One multiplexer, is electrically connected at this reference comparator, this first latch unit, this second latch unit and is somebody's turn to doController, this second high potential output signal and this second door bolt that transmit in order to receive this reference comparatorLock this delay output signal that device sent out, so as to comprising work more than this second high potential output signal by oneProcessing signals is sent to this first latch unit and this controller.
9. touch-control sensing system as claimed in claim 8, is characterized in that, this first latch unit and thisTwo latch units are D type flip-flop.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101076771A (en) * | 2005-04-30 | 2007-11-21 | 埃派克森微电子有限公司 | Circuit and method for managing power supply |
| CN101194172A (en) * | 2005-06-16 | 2008-06-04 | 艾勒博科技股份有限公司 | Touch sensor and signal generation method thereof |
| CN101414819A (en) * | 2007-10-16 | 2009-04-22 | 通泰积体电路股份有限公司 | Sensing method and apparatus for controlling current source and compensating touch control capacitance |
| CN101689855A (en) * | 2007-06-28 | 2010-03-31 | 艾勒博科技股份有限公司 | Automatic impedance adjuster and control method thereof |
| US20110279131A1 (en) * | 2010-05-13 | 2011-11-17 | Silicon Works Co., Ltd | Circuit and method for measuring capacitance value of touch screen |
| US8159462B1 (en) * | 2006-11-15 | 2012-04-17 | Cypress Semiconductor Corporation | Reference voltage offset for capacitive touch-sensor measurement |
| CN102782625A (en) * | 2010-04-30 | 2012-11-14 | 密克罗奇普技术公司 | Mutual capacitance measurement in a multi-touch input device |
| CN102968236A (en) * | 2012-11-28 | 2013-03-13 | 旭曜科技股份有限公司 | Sensing circuit and sensing method of capacitive touch panel |
| CN103902119A (en) * | 2012-12-24 | 2014-07-02 | 乐金显示有限公司 | Touch sensing device |
-
2014
- 2014-11-18 CN CN201410657890.3A patent/CN105610422B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101076771A (en) * | 2005-04-30 | 2007-11-21 | 埃派克森微电子有限公司 | Circuit and method for managing power supply |
| CN101194172A (en) * | 2005-06-16 | 2008-06-04 | 艾勒博科技股份有限公司 | Touch sensor and signal generation method thereof |
| US8159462B1 (en) * | 2006-11-15 | 2012-04-17 | Cypress Semiconductor Corporation | Reference voltage offset for capacitive touch-sensor measurement |
| CN101689855A (en) * | 2007-06-28 | 2010-03-31 | 艾勒博科技股份有限公司 | Automatic impedance adjuster and control method thereof |
| CN101414819A (en) * | 2007-10-16 | 2009-04-22 | 通泰积体电路股份有限公司 | Sensing method and apparatus for controlling current source and compensating touch control capacitance |
| CN102782625A (en) * | 2010-04-30 | 2012-11-14 | 密克罗奇普技术公司 | Mutual capacitance measurement in a multi-touch input device |
| US20110279131A1 (en) * | 2010-05-13 | 2011-11-17 | Silicon Works Co., Ltd | Circuit and method for measuring capacitance value of touch screen |
| CN102968236A (en) * | 2012-11-28 | 2013-03-13 | 旭曜科技股份有限公司 | Sensing circuit and sensing method of capacitive touch panel |
| CN103902119A (en) * | 2012-12-24 | 2014-07-02 | 乐金显示有限公司 | Touch sensing device |
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|---|---|
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Effective date of registration: 20180820 Address after: 1, 7 yuan, 2 yuan 1 Street, Hsinchu, Taiwan, China Patentee after: Advanced Analog Technology, Inc. Address before: Taiwan Hsinchu County Tai Yuan Street China jhubei City, No. 38 3 floor 8 Patentee before: Yuanxiang Technology Co., Ltd. |