CN105677119A - Capacitive touch screen and detection circuit thereof, electronic equipment - Google Patents
Capacitive touch screen and detection circuit thereof, electronic equipment Download PDFInfo
- Publication number
- CN105677119A CN105677119A CN201410658791.7A CN201410658791A CN105677119A CN 105677119 A CN105677119 A CN 105677119A CN 201410658791 A CN201410658791 A CN 201410658791A CN 105677119 A CN105677119 A CN 105677119A
- Authority
- CN
- China
- Prior art keywords
- signal
- sensing
- compensating
- circuit
- touch
- 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.)
- Pending
Links
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
- Electronic Switches (AREA)
Abstract
The application discloses a capacitive touch screen and a detection circuit thereof, and electronic equipment; the detection circuit comprises the following structures: a touch sensing circuit comprising a mutual capacitance sensing element, the mutual capacitance sensing element is used for sensing touch operations, and one end of the mutual capacitance sensing element is the output end of the touch sensing circuit; a first compensating circuit comprising a compensation resistor and a first voltage source, wherein eh compensation resistor is connected between the first voltage source and the output end, and a node is defined between the output end of the compensation resistor; a conversion circuit comprising an operation amplifier and a feedback branch, the operation amplifier comprises a non inverting input end, a inverting input end, and an output end; the feedback branch is connected between the inverting input end and the output end of the operation amplifier, the inverting input end is further connected with the node, and the non-inverting input end is used for receiving reference voltage. The compensation circuit is used for compensating signals for the touch sensing circuit, thus improving touch detection precision.
Description
Technical field
The present invention relates to touch detection technical field, relate to more specifically a kind of capacitive touch screen and inspection thereofSlowdown monitoring circuit and electronic equipment.
Background technology
The touch electrode of capacitive touch screen comprises multiple drive electrodes along first direction and multiple alongThe sensing electrode of two directions. Wherein, described multiple drive electrode and the described multiple sensing electrode shape that is coupledBecome multiple mutual capacitance sensing elements. When described in writing pencil or user's finger touch when capacitive touch screen,Can affect the size of the coupling capacitance between near the drive electrode of touch location and corresponding sensing electrode, therebyJudge touch location according to the change amount of coupling capacitance.
But, for capacitive touch screen touch for, the sensing electrode that drive electrode is coupled with it itBetween the reference capacitance (not having the electric capacity that touches when operation) that forms in the time not having the operation of touch, can produce sensing letterNumber, if this sensing signal does not reduce or eliminates in the time having the operation of touch, can produce not touching to detectProfit impact. Therefore, correspondence provides touching of a kind of adverse effect that can reduce or eliminate described reference capacitanceTouch testing circuit necessary to become.
Summary of the invention
For addressing the above problem, the invention provides a kind of capacitive touch screen and testing circuit thereof and electronicsEquipment, is improved and is touched the precision detecting by compensating circuit.
For achieving the above object, the invention provides a kind of testing circuit of capacitive touch screen, this detectionCircuit comprises:
Touch-sensing circuit, described touch-sensing circuit comprises mutual capacitance sensing element, for touch sensitiveOperation, one end of described mutual capacitance sensing element is as the output of touch-sensing circuit;
The first compensating circuit, comprises compensating resistance and the first voltage source, described in described compensating resistance is connected inBetween the first voltage source and described output, between described output and described compensating resistance, define a node;
Change-over circuit, described change-over circuit comprises operational amplifier and feedback branch, described operational amplifierComprise in-phase input end, inverting input and output, described feedback branch is connected in described computing and putsBetween the inverting input and output of large device, described inverting input is further connected with described node,Described in-phase input end is used for receiving reference voltage.
Preferably, in above-mentioned testing circuit, described mutual capacitance sensing element for touch sensitive operation,Generate corresponding touch-sensing signal, and export described touch-sensing signal to described node, described firstVoltage source provides the first voltage to described compensating resistance, and the corresponding output corresponding first of described compensating resistance is mendedRepay signal to described node, described the first compensating signal is used for described touch-sensing signal to compensate,Wherein, described the first compensating signal and described touch-sensing signal are with same frequency and reversed-phase signal.
Preferably, in above-mentioned testing circuit, definition does not have when operation of touch, described mutual capacitance sensingThe touch-sensing signal generating when part work is the first sensing signal, and described the first compensating signal is used for subtractingLittle described the first sensing signal.
Preferably, in above-mentioned testing circuit, define described touch-sensing signal through described the first indemnity letterNumber compensation after signal be the second sensing signal, described node export described the second sensing signal to described in turnChange circuit, described change-over circuit is changed described the second sensing signal into corresponding the 3rd sensing signal, with rootDetermine the occurrence positions of described touch operation according to described the 3rd sensing signal.
Preferably, in above-mentioned testing circuit, described touch-sensing circuit comprises that multiple drive electrodes are with manyIndividual sensing electrode, described multiple drive electrodes and described multiple sensing electrode be used for being coupled form multiple mutual electricityHold sensing element, wherein, described the first compensating circuit connects each sensing electrode, and each sensing electrode is doneFor the output of described touch-sensing circuit.
Preferably, in above-mentioned testing circuit, described compensating resistance is variable resistor or fixed resistance, instituteStating the first voltage source is constant pressure source or variable voltage source.
Preferably, in above-mentioned testing circuit, when described the first sensing signal, described testing circuit enters oneStep comprises the second compensating circuit, and described the second compensating circuit comprises current source, described current source and described jointPoint connects, and described current source provides the second compensating signal to described node, described the second compensating signal and instituteState the signal that the first sensing signal is with same frequency and reversed-phase, described the second compensating signal is used for reducing described the first senseSurvey signal.
Preferably, in above-mentioned testing circuit, described testing circuit further comprises the 3rd compensating circuit,Described the 3rd compensating circuit comprises building-out capacitor and second voltage source, and described building-out capacitor is connected in describedBetween two voltage sources and described node, described second voltage source provides second voltage to described building-out capacitor,Described building-out capacitor receives described second voltage, and exports described the 3rd compensating signal to described node, itsIn, described the 3rd compensating signal and described the first sensing signal are with same frequency and reversed-phase signal, described the 3rd compensationSignal is used for reducing described the first sensing signal.
Preferably, in above-mentioned testing circuit, described negative-feedback circuit comprises: reset switch, resistance,Electric capacity;
Wherein, the output that described resistance and described Capacitance parallel connection are connected in described operational amplifier with described inBetween node, one end of described reset switch connects the output of described operational amplifier, and the other end connectsDescribed node, for described output is resetted, makes described output when described reset switch is closedTerminal voltage equals described reference voltage.
Preferably, in above-mentioned testing circuit, described the first compensating signal and described the first sensing signal areWith width with same frequency and reversed-phase signal, or described the first compensating signal and the first sensing signal be with same frequency and reversed-phase signal,And the difference of the amplitude of the amplitude of the first sensing signal and the first compensating signal is greater than 0 and be less than the first sensing letterNumber amplitude 30 percent.
Preferably, in above-mentioned testing circuit, described mutual capacitance sensing element is used for receiving touching to drive to be believedNumber, and the described touch-sensing signal of corresponding generation, wherein, described touch drives signal and described the first electricityPress as with same frequency and reversed-phase signal.
Preferably, in above-mentioned testing circuit, described mutual capacitance sensing element is used for receiving touching to drive to be believedNumber, and the described touch-sensing signal of corresponding generation, wherein, described touch drives signal and described the second electricityPress as with same frequency and reversed-phase signal.
The application also provides a kind of capacitive touch screen, and this capacitive touch screen comprises: above-mentioned any oneDescribed testing circuit.
The application also provides a kind of electronic equipment, and this electronic equipment comprises: above-mentioned capacitive touch screen.
Preferably, in above-mentioned electronic equipment, described electronic equipment is mobile phone, or PDA, or GPS,Or panel computer, or industrial control equipment, or household electrical appliance.
The application also provides a kind of testing circuit of capacitive touch screen, and this testing circuit comprises:
Touch-sensing circuit, described touch-sensing circuit is for touch sensitive operation, and generation is corresponding tactileTouch sensing signal, define described touch-sensing circuit and the touch-sensing generating while touching operation do not detectedSignal is the first sensing signal;
The first compensating circuit, described the first compensating circuit is used for generating the first compensating signal, and described first mendsRepay signal and compensate for the touch-sensing signal that described touch-sensing circuit is generated, wherein, instituteStating the first compensating signal and the first sensing signal is with same frequency and reversed-phase signal, and described the first compensating signal is used for disappearingRemove or reduce described the first sensing signal, defining described touch-sensing signal and mend through described the first compensating signalSignal after repaying is the second sensing signal; With
Change-over circuit, described change-over circuit is used for obtaining described the second sensing signal, and by described the second senseSurvey signal and be converted to corresponding the 3rd sensing signal, to determine described touch according to described the 3rd sensing signalThe occurrence positions of operation; Described touch-sensing circuit is connected with described change-over circuit, described touch-sensing electricityBetween road and described change-over circuit, define a node, described the first compensating circuit is connected in described node, instituteState the first compensating circuit and export described compensating signal to described node, described in described touch-sensing circuit is exportedTouch-sensing signal is given described node, and described node is exported described the second sensing signal to described change-over circuit;
Described the first compensating circuit comprises compensating resistance and the first voltage source, and described compensating resistance is connected in instituteState between the first voltage source and described node, described the first voltage source provides the first voltage to described compensation electricityResistance, described the first compensating signal of the corresponding output of described compensating resistance is given described node.
The application also provides a kind of testing circuit of capacitive touch screen, and this testing circuit comprises:
Touch-sensing circuit, described touch-sensing circuit is for touch sensitive operation, and generation is corresponding tactileTouch sensing signal, define described touch-sensing circuit and the touch-sensing generating while touching operation do not detectedSignal is the first sensing signal;
The first compensating circuit, described the first compensating circuit is used for generating the first compensating signal, and described first mendsRepay signal and compensate for the touch-sensing signal that described touch-sensing circuit is generated, wherein, instituteStating the first compensating signal and the first sensing signal is with same frequency and reversed-phase signal, and described the first compensating signal is used for disappearingRemove or reduce described the first sensing signal, defining described touch-sensing signal and mend through described the first compensating signalSignal after repaying is the second sensing signal; With
Change-over circuit, described change-over circuit is used for obtaining described the second sensing signal, and by described the second senseSurvey signal and be converted to corresponding the 3rd sensing signal, to determine described touch according to described the 3rd sensing signalThe occurrence positions of operation; Described touch-sensing circuit is connected with described change-over circuit, described touch-sensing electricityBetween road and described change-over circuit, define a node, described the first compensating circuit is connected in described node, instituteState the first compensating circuit and export described compensating signal to described node, described in described touch-sensing circuit is exportedTouch-sensing signal is given described node, and described node is exported described the second sensing signal to described change-over circuit;
Described the first compensating circuit comprises current source, and described current source is connected with described node, described electric currentSource provides the first compensating signal to described node.
Known by foregoing description, the testing circuit described in the application comprises: touch-sensing circuit, described inTouch-sensing circuit comprises mutual capacitance sensing element, for touch sensitive operation, described touch-sensing signalOne end as the output of touch-sensing circuit; The first compensating circuit, comprises compensating resistance and the first electricityPotential source, described compensating resistance is connected between described the first voltage source and described output, described outputAnd between described compensating resistance, define a node; Change-over circuit, described change-over circuit comprises operational amplifierAnd feedback branch, described operational amplifier comprises in-phase input end, inverting input and output, instituteState between the inverting input and output that feedback branch is connected in described operational amplifier, described anti-phase defeatedEnter end and be further connected with described node, described in-phase input end is used for receiving reference voltage.
Described testing circuit is provided with described compensating circuit, can carry out signal to described touch-sensing circuitCompensation, and then improve touch accuracy of detection. Simultaneously can be by described compensating resistance and/or described the be setThe size of one voltage source, adjusts the size that is used for the compensating signal that described touch-sensing circuit is compensated,To adjust compensation magnitude, further ensure to touch accuracy of detection. The electronic equipment that the embodiment of the present application providesAnd capacitive touch screen, there is above-mentioned testing circuit, therefore there is higher touch accuracy of detection.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will be to realityThe accompanying drawing of executing required use in example or description of the Prior Art is briefly described, apparently, belowAccompanying drawing in description is only embodiments of the invention, for those of ordinary skill in the art, notPay under the prerequisite of creative work, other accompanying drawing can also be provided according to the accompanying drawing providing.
The structural representation of the testing circuit of a kind of capacitive touch screen that Fig. 1 provides for the embodiment of the present application oneFigure;
Fig. 2 is a kind of embodiment schematic diagram of the first compensating circuit of testing circuit shown in Fig. 1;
Fig. 3 is the another kind of embodiment schematic diagram of the first compensating circuit of testing circuit shown in Fig. 1;
The structural representation of the testing circuit of a kind of capacitive touch screen that Fig. 4 provides for the embodiment of the present application twoFigure;
The structure of the testing circuit of the another kind of capacitive touch screen that Fig. 5 provides for the embodiment of the present application two is shownIntention;
The structure of the testing circuit of another capacitive touch screen that Fig. 6 provides for the embodiment of the present application two is shownIntention;
The structure of the testing circuit of another capacitive touch screen that Fig. 7 provides for the embodiment of the present application two is shownIntention;
A kind of embodiment schematic diagram of the change-over circuit that Fig. 8 provides for the embodiment of the present application two;
The another kind of embodiment schematic diagram of change-over circuit that Fig. 9 provides for the embodiment of the present application two;
The structural representation of a kind of capacitive touch screen that Figure 10 provides for the embodiment of the present application three;
The structural representation of a kind of electronic equipment that Figure 11 provides for the embodiment of the present application three.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried outDescribe clearly and completely, obviously, described embodiment is only the present invention's part embodiment, andNot whole embodiment. Based on the embodiment in the present invention, those of ordinary skill in the art are not doingGo out the every other embodiment obtaining under creative work prerequisite, all belong to the scope of protection of the invention.
Embodiment mono-
With reference to figure 1, the testing circuit of a kind of capacitive touch screen that Fig. 1 provides for the embodiment of the present application one10 structural representation, described testing circuit 10 comprises: touch-sensing circuit 11, the first compensating circuit12 and change-over circuit 13.
Described touch-sensing circuit 11 operates for touch sensitive, and generates corresponding touch-sensing signal,Define described touch-sensing circuit 11 and do not detect that the touch-sensing signal generating while touching operation is firstSensing signal.
Described the first compensating circuit 12 is for generating the first compensating signal, and described the first compensating signal is for rightThe touch-sensing signal that described touch-sensing circuit 11 generates compensates. Wherein, described the first compensationSignal and the first sensing signal are with same frequency and reversed-phase signal, and described the first compensating signal is for elimination or reduce instituteState the first sensing signal, define the signal of described touch-sensing signal after described the first compensating signal compensationIt is the second sensing signal.
Described change-over circuit 13 is for obtaining described the second sensing signal, and described the second sensing signal is turnedBe changed to corresponding the 3rd sensing signal, to determine sending out of described touch operation according to described the 3rd sensing signalRaw position. Described touch-sensing circuit 11 is connected with described change-over circuit 13, described touch-sensing circuit11 and described change-over circuit 13 between define a node P, described in described the first compensating circuit 12 is connected inNode P, described the first compensating circuit 12 is exported described compensating signal to described node P, described touch senseSlowdown monitoring circuit 11 is exported described touch-sensing signal to described node P, and described node P exports described the second senseSurvey signal to described change-over circuit 13.
With reference to figure 2, Fig. 2 is a kind of embodiment of the first compensating circuit 12 of testing circuit shown in Fig. 1Schematic diagram, now, described the first compensating circuit 12 comprises: compensating resistance R and the first voltage source Us1,Described compensating resistance R is serially connected with between described the first voltage source Us1 and described node P, described the first electricityPotential source Us1 provides the first voltage VB1 to described compensating resistance R, the corresponding output of described compensating resistance R instituteState the first compensating signal to described node P.
With reference to figure 3, Fig. 3 is the another kind enforcement side of the first compensating circuit 12 of testing circuit shown in Fig. 1Formula schematic diagram, now, described the first compensating circuit 12 comprises current source Is, described current source Is with described inNode P connects, and described current source Is provides the first compensating signal to described node P. Can be by being instituteStating current source Is connects electric current I B and provides the first compensating signal for described node P.
Known by foregoing description, testing circuit 10 is by arranging described the first compensation electricity described in the present embodimentTouch-sensing circuit 11 can be eliminated or reduce in road 12 the touch-sensing letter that touches when operation and existNumber, touch accuracy of detection thereby improve.
Embodiment bis-
The present embodiment provides a kind of testing circuit of capacitive touch screen, and with reference to figure 4, Fig. 4 is the applicationThe structural representation of the testing circuit 40 of a kind of capacitive touch screen that embodiment bis-provides, described detection electricityRoad 40 comprises: touch-sensing circuit 11, the first compensating circuit 12 and change-over circuit 13. Wherein, instituteStating touch-sensing circuit 11 is all connected with described change-over circuit 13 with described the first compensating circuit 12.
Described touch-sensing circuit 11 comprises mutual capacitance sensing element Cm, for touch sensitive operation, instituteState one end of mutual capacitance sensing element Cm as the output of touch-sensing circuit 11.
In the present embodiment, described the first compensating circuit 12 adopts Fig. 2 illustrated embodiment, comprising: mendRepay resistance R and the first voltage source Us1, described compensating resistance R be connected in described the first voltage source Us1 withBetween described output, between described output and described compensating resistance, define a node P.
Described change-over circuit 13 comprises: operational amplifier OP and feedback branch 14. Wherein, described computingAmplifier OP comprises: in-phase input end, inverting input and output VO. Described feedback branch 14Be connected between the inverting input and output VO of described operational amplifier OP described inverting inputFurther be connected with described node P, described in-phase input end is used for receiving reference voltage VREF.
Described mutual capacitance sensing element Cm operates, generates corresponding touch-sensing signal for touch sensitive,And exporting described touch-sensing signal to described node P, described the first voltage source Us1 provides the first voltageVB1 gives described compensating resistance R. Corresponding the first compensating signal of the corresponding output of described compensating resistance R is to instituteState node P, described the first compensating signal is for compensating described touch-sensing signal.
Wherein, described the first compensating signal and described touch-sensing signal are with same frequency and reversed-phase signal. Can lead toCross and control described the first voltage source Us1 and make described the first compensating signal so that described the first voltage VB1 to be setWith described touch-sensing signal be with same frequency and reversed-phase signal. When the first compensating signal and described touch-sensing signalDuring for same frequency and reversed-phase signal, can mend described touch-sensing signal by described the first compensating signalRepay, touch to improve the precision detecting.
In the present embodiment, when definition does not have when operation of touch, described mutual capacitance sensing element Cm workThe touch-sensing signal generating is the first sensing signal, and described the first compensating signal is used for reducing describedOne sensing signal.
Further, defining the signal of described touch-sensing signal after described the first compensating signal compensation isThe second sensing signal, described node P export described the second sensing signal give described change-over circuit 13, described in turnChange circuit 13 and change described the second sensing signal into corresponding the 3rd sensing signal, to feel according to the described the 3rdSurvey signal and determine the occurrence positions of described touch operation. Described change-over circuit 13 is by output VO output instituteState the 3rd sensing signal.
Described touch-sensing circuit 11 comprises multiple drive electrodes and multiple sensing electrode, described multiple drivingsElectrode and described multiple sensing electrode are used for being coupled and form multiple mutual capacitance sensing element Cm, wherein, described inThe first compensating circuit 12 connects each sensing electrode, and each sensing electrode is as described touch-sensing circuit 11Output.
Described mutual capacitance sensing element Cm is used for receiving touch and drives signal, and the described touch of corresponding generationSensing signal, wherein, it is with same frequency and reversed-phase signal that described touch drives signal and described the first voltage VB1.In Fig. 1 illustrated embodiment, show N mutual capacitance sensing element Cm, receive successively first and touchTouch and drive signal TX1-N mono-to touch driving signal TXN, each mutual capacitance sensing element Cm touches in correspondenceTouch to drive under signal and carry out touch-sensing. Wherein, N is positive integer.
Described compensating resistance R is variable resistor or fixed resistance, and described the first voltage source Us1 can be constant voltageSource or variable voltage source.
For the touch-sensing circuit 11 of setting, its corresponding compensating signal theoretical value is definite value, therefore described inCompensating resistance R and described the first voltage source Us1 can be all constant. But, for fear of needs to compensationThe measurement of signal theory value, in the present embodiment, preferably arranges described compensating resistance R and described the first voltageThe size of at least one in the Us1 of source is adjustable, by regulating described compensating resistance R and/or described the first electricityPotential source Us1 to be to regulate the size of described the first compensating signal, and then realizes and eliminate or reduce described touch-sensingThe object of the first sensing signal in signal, and then realize and improve the object that touches precision.
In view of resistance adjustment is comparatively simple, and constant voltage power supply circuit is simple, therefore, in the present embodiment, excellentThe described compensating resistance R that arranges of choosing is variable resistor, and described the first voltage source Us1 is constant pressure source.
Known by foregoing description, described testing circuit is provided with described the first compensating circuit 12, by establishingPut the size of described compensating resistance R and/or described the first voltage source Us1, control described the first compensating signalSize, and then eliminate or reduce first in described touch-sensing signal by described the first compensating signal and feelSurvey signal, do not have the touch-sensing while touching operation thereby can eliminate or reduce mutual capacitance sensing element CmSignal, to reduce or to eliminate it to touching the impact of accuracy of detection, has improved touch accuracy of detection.
Touch-sensing signal is ac current signal, is converted to ac voltage signal through change-over circuit 13,In the time of touch-sensing, determine the occurrence positions that touches operation according to described ac voltage signal. Described firstCompensating circuit 12 can provide one with described the first sensing signal with the first frequently reverse compensating signal with rightDescribed the first sensing signal carries out current compensation, and then improves touch precision.
With reference to figure 5, the testing circuit of the another kind of capacitive touch screen that Fig. 5 provides for the embodiment of the present application two50 structural representation. Fig. 5 illustrated embodiment and different being in Fig. 4, testing circuit 50 shown in Fig. 5 entersOne step comprises: the second compensating circuit 21.
Described the second compensating circuit 21 comprises current source Is, and described current source Is is connected with described node P, instituteStating current source provides the second compensating signal to described node P, described the second compensating signal and described the first sensingSignal is the signal of with same frequency and reversed-phase, and described the second compensating signal is used for reducing described the first sensing signal. InstituteStating the second compensating signal can be electric current I B. Described current source Is can be constant-current source or adjustable currentSource.
Described the second compensating circuit 21 can play the effect identical with above-mentioned the first compensating circuit 12, providesWith same the second frequently reverse compensating signal of described the first sensing signal. Described the second compensating signal can with instituteState the first compensating signal and act on simultaneously, for reducing or eliminating described the first sensing signal, or do separatelyWith, for reducing or eliminating described the first sensing signal.
With reference to figure 6, the testing circuit of another capacitive touch screen that Fig. 6 provides for the embodiment of the present application two60 structural representation. Fig. 6 illustrated embodiment and different being in Fig. 4, testing circuit 60 shown in Fig. 6 entersOne step comprises: the 3rd compensating circuit 31.
Described the 3rd compensating circuit 31 comprises: building-out capacitor Cb and second voltage source Us2. Described compensation electricityHold Cb and be connected between described second voltage source Us2 and described node P, described second voltage source Us2 providesSecond voltage VB2 gives described building-out capacitor Cb, and described building-out capacitor Cb receives described second voltage VB2,And export described the 3rd compensating signal to described node P. Wherein, described the 3rd compensating signal and described firstSensing signal is with same frequency and reversed-phase signal, and described the 3rd compensating signal is used for reducing described the first sensing signal.Described second voltage source Us2 can be constant pressure source or variable voltage source. Described building-out capacitor Cb can be variableElectric capacity or fixed capacity. Now, described mutual capacitance sensing element Cm is used for receiving touch and drives signal, andThe described touch-sensing signal of corresponding generation, wherein, described touch drives signal and described second voltage VB2For with same frequency and reversed-phase signal.
Described the 3rd compensating circuit 31 can play the effect identical with above-mentioned the first compensating circuit 12, providesWith same the 3rd frequently reverse compensating signal of described the first sensing signal. Described the 3rd compensating signal can with instituteState the first compensating signal and act on simultaneously, for reducing or eliminating described the first sensing signal, or do separatelyWith, for reducing or eliminating described the first sensing signal.
With reference to figure 7, the testing circuit of another capacitive touch screen that Fig. 7 provides for the embodiment of the present application two70 structural representation. Fig. 7 illustrated embodiment and different being in Fig. 4, testing circuit 70 shown in Fig. 7 is sameTime comprise described the first compensating circuit 12, the second compensating circuit 21 and the 3rd compensating circuit 31. DescribedOne compensating circuit 12, the second compensating circuit 21 and the 3rd compensating circuit 31 threes separately with described touch senseThe annexation of slowdown monitoring circuit 11 and change-over circuit 13 is identical with above-mentioned embodiment, does not repeat them here.
Fig. 7 illustrated embodiment has above-mentioned three kinds of compensating circuits simultaneously, and described the first sensing signal is being continuedContinuous while twisting compensation, can adopt one of them compensating circuit to compensate, also can adopt wherein arbitrarilyTwo compensating circuits compensate, and also can adopt above-mentioned three kinds of compensating circuits to compensate simultaneously, all canImprove to realize the object that touches accuracy of detection.
In Fig. 4-Fig. 7 illustrated embodiment, same by the size of each element in corresponding compensating circuit is setSize that can control and compensation signal, realizes and eliminates or reduce the first sensing in described touch-sensing signalThe object of signal, improves and touches accuracy of detection.
In this application, described touch-sensing signal is touch-sensing electric current, and described the 3rd sensing signal isVoltage signal. Known by foregoing description, in the time carrying out touch-sensing, the indemnity letter that compensating circuit generatesNumber be offset current, can be used for eliminating or reduce described the first sensing signal and cause the reference current existing,And then guarantee touches accuracy of detection.
With reference to figure 8, Fig. 8 shows for a kind of embodiment of the change-over circuit 13 that the embodiment of the present application two providesIntention. In change-over circuit 13 shown in Fig. 8, its feedback branch 14 comprises capacitor C f, described capacitor C fA pole plate connect described output VO, another pole plate connects described inverting input.
With reference to figure 9, Fig. 9 shows for the another kind of embodiment of change-over circuit 13 that the embodiment of the present application two providesIntention. In Fig. 9 illustrated embodiment, described change-over circuit 13 feedback branches 14 further comprise:Resistance R _ f and reset switch Rst. Wherein, described resistance R _ f and described capacitor C f are connected in parallel in instituteState between the output VO and described node P of operational amplifier OP one end of described reset switch RstConnect the output VO of described operational amplifier OP, the other end connects described node P, and described reset is openedClose Rst when closed for described output VO is resetted, make described in described output end voltage equalsReference voltage VREF.
Described feedback branch 14 is not limited to Fig. 8 and Fig. 9 illustrated embodiment, can also be only by described resistanceRf forms, or is only made up of described resistance R _ f and described reset switch Rst.
In above-mentioned testing circuit, in order to weaken or to eliminate described the first sensing signal, institute can be setStating the first compensating signal and described the first sensing signal is with width with same frequency and reversed-phase signal, or described first mendsRepaying signal and the first sensing signal is with same frequency and reversed-phase signal, and the amplitude of the first sensing signal and the first compensationThe difference of the amplitude of signal be greater than 0 and be less than the first sensing signal amplitude 30 percent.
Known by foregoing description, testing circuit is by arranging the compensation electricity of setting described in the embodiment of the present applicationTouch-sensing circuit 11 can be eliminated or reduce in road the touch-sensing letter that touches when operation and existNumber, touch accuracy of detection thereby improve.
Embodiment tri-
The present embodiment also provides a kind of capacitive touch screen, and with reference to Figure 10, Figure 10 is the embodiment of the present applicationThe structural representation of the three a kind of capacitive touch screens 71 that provide, described capacitive touch screen 71 comprises: inspectionSlowdown monitoring circuit 72. Described touch detection circuit 72 is the touch inspection described in any embodiment of above-described embodimentSlowdown monitoring circuit.
The present embodiment also provides a kind of electronic equipment, and with reference to Figure 11, Figure 11 provides for the embodiment of the present applicationThe structural representation of a kind of electronic equipment 81, described electronic equipment 81 comprises: above-mentioned capacitive touch screen71。
Described electronic equipment 81 can be mobile phone, or PDA, or GPS, or panel computer, or Industry ControlEquipment, or the electronic installation such as household electrical appliance.
Describe according to above-described embodiment institute testing circuit known, due to described capacitive touch screen 71 and electricitySubset 81 comprises testing circuit described in the embodiment of the present application, therefore, described capacitive touch screen 71 andElectronic equipment 81 has good touch-sensing precision.
It should be noted that, the above-mentioned explanation of the disclosed embodiments, makes professional and technical personnel in the field's energyEnough realization or use the present invention. The multiple amendment of these embodiment is come those skilled in the artSay it will will be apparent, General Principle as defined herein can do not depart from spirit of the present invention orIn the situation of scope, realize in other embodiments. Therefore, the present invention will can not be restricted to institute hereinThese embodiment that show, but to meet consistent with principle disclosed herein and features of novelty the widestScope.
Claims (17)
1. a testing circuit for capacitive touch screen, is characterized in that, comprising:
Touch-sensing circuit, described touch-sensing circuit comprises mutual capacitance sensing element, for touch sensitiveOperation, one end of described mutual capacitance sensing element is as the output of touch-sensing circuit;
The first compensating circuit, comprises compensating resistance and the first voltage source, described in described compensating resistance is connected inBetween the first voltage source and described output, between described output and described compensating resistance, define a node;
Change-over circuit, described change-over circuit comprises operational amplifier and feedback branch, described operational amplifierComprise in-phase input end, inverting input and output, described feedback branch is connected in described computing and putsBetween the inverting input and output of large device, described inverting input is further connected with described node,Described in-phase input end is used for receiving reference voltage.
2. testing circuit according to claim 1, is characterized in that, described mutual capacitance sensing elementFor touch sensitive operation, generate corresponding touch-sensing signal, and export described touch-sensing signal toDescribed node, described the first voltage source provides the first voltage to described compensating resistance, described compensating resistance pairShould export corresponding the first compensating signal to described node, described the first compensating signal is used for described touchSensing signal compensates, and wherein, described the first compensating signal and described touch-sensing signal are with frequently anti-Phase signals.
3. testing circuit according to claim 2, is characterized in that, when definition does not have the operation of touch,The touch-sensing signal generating when the work of described mutual capacitance sensing element is the first sensing signal, described theOne compensating signal is used for reducing described the first sensing signal.
4. testing circuit according to claim 3, is characterized in that, defines described touch-sensing letterSignal number after described the first compensating signal compensation is the second sensing signal, and described node exports described theTwo sensing signals are given described change-over circuit, and described change-over circuit is changed described the second sensing signal for correspondingThe 3rd sensing signal, to determine the occurrence positions of described touch operation according to described the 3rd sensing signal.
5. testing circuit according to claim 4, is characterized in that, described touch-sensing circuit bagDraw together multiple drive electrodes and multiple sensing electrode, described multiple drive electrodes and described multiple sensing electrode are usedForm multiple mutual capacitance sensing elements in coupling, wherein, described the first compensating circuit connects each sensing electricityThe utmost point, each sensing electrode is as the output of described touch-sensing circuit.
6. testing circuit according to claim 1, is characterized in that, described compensating resistance is variableResistance or fixed resistance, described the first voltage source is constant pressure source or variable voltage source.
7. testing circuit according to claim 4, is characterized in that, when described the first sensing signal,Described testing circuit further comprises the second compensating circuit, and described the second compensating circuit comprises current source, instituteState current source and be connected with described node, described current source provides the second compensating signal to described node, described inThe signal that the second compensating signal and described the first sensing signal are with same frequency and reversed-phase, described the second compensating signal is usedIn reducing described the first sensing signal.
8. according to the testing circuit described in claim 4 or 7, it is characterized in that, described testing circuit entersOne step comprises the 3rd compensating circuit, and described the 3rd compensating circuit comprises building-out capacitor and second voltage source, instituteState building-out capacitor and be connected between described second voltage source and described node, described second voltage source providesTwo voltages are given described building-out capacitor, and described building-out capacitor receives described second voltage, and exports the described the 3rdCompensating signal is given described node, and wherein, described the 3rd compensating signal and described the first sensing signal are with frequentlyInversion signal, described the 3rd compensating signal is used for reducing described the first sensing signal.
9. testing circuit according to claim 1, is characterized in that, described negative-feedback circuit comprises:Reset switch, resistance, electric capacity;
Wherein, the output that described resistance and described Capacitance parallel connection are connected in described operational amplifier with described inBetween node, one end of described reset switch connects the output of described operational amplifier, and the other end connectsDescribed node, for described output is resetted, makes described output when described reset switch is closedTerminal voltage equals described reference voltage.
10. testing circuit according to claim 3, is characterized in that, described the first compensating signalWith described the first sensing signal be same width with same frequency and reversed-phase signal, or described the first compensating signal and first senseSurveying signal is with same frequency and reversed-phase signal, and the amplitude of the amplitude of the first sensing signal and the first compensating signal is poorBe greater than 0 and be less than the first sensing signal amplitude 30 percent.
11. testing circuits according to claim 1, is characterized in that, described mutual capacitance sensingPart is used for receiving touch and drives signal, and the described touch-sensing signal of corresponding generation, wherein, and described touchDriving signal and described the first voltage is with same frequency and reversed-phase signal.
12. testing circuits according to claim 8, is characterized in that, described mutual capacitance sensingPart is used for receiving touch and drives signal, and the described touch-sensing signal of corresponding generation, wherein, and described touchDriving signal and described second voltage is with same frequency and reversed-phase signal.
13. 1 kinds of capacitive touch screens, is characterized in that, comprising: as claim 1-12 any one instituteThe testing circuit of stating.
14. 1 kinds of electronic equipments, is characterized in that, comprising: capacitive touch as claimed in claim 13Touch screen.
15. electronic equipments according to claim 14, is characterized in that, described electronic equipment is handMachine, or PDA, or GPS, or panel computer, or industrial control equipment, or household electrical appliance.
The testing circuit of 16. 1 kinds of capacitive touch screens, is characterized in that, comprising:
Touch-sensing circuit, described touch-sensing circuit is for touch sensitive operation, and generation is corresponding tactileTouch sensing signal, define described touch-sensing circuit and the touch-sensing generating while touching operation do not detectedSignal is the first sensing signal;
The first compensating circuit, described the first compensating circuit is used for generating the first compensating signal, and described first mendsRepay signal and compensate for the touch-sensing signal that described touch-sensing circuit is generated, wherein, instituteStating the first compensating signal and the first sensing signal is with same frequency and reversed-phase signal, and described the first compensating signal is used for disappearingRemove or reduce described the first sensing signal, defining described touch-sensing signal and mend through described the first compensating signalSignal after repaying is the second sensing signal; With
Change-over circuit, described change-over circuit is used for obtaining described the second sensing signal, and by described the second senseSurvey signal and be converted to corresponding the 3rd sensing signal, to determine described touch according to described the 3rd sensing signalThe occurrence positions of operation; Described touch-sensing circuit is connected with described change-over circuit, described touch-sensing electricityBetween road and described change-over circuit, define a node, described the first compensating circuit is connected in described node, instituteState the first compensating circuit and export described compensating signal to described node, described in described touch-sensing circuit is exportedTouch-sensing signal is given described node, and described node is exported described the second sensing signal to described change-over circuit;
Described the first compensating circuit comprises compensating resistance and the first voltage source, and described compensating resistance is connected in instituteState between the first voltage source and described node, described the first voltage source provides the first voltage to described compensation electricityResistance, described the first compensating signal of the corresponding output of described compensating resistance is given described node.
The testing circuit of 17. 1 kinds of capacitive touch screens, is characterized in that, comprising:
Touch-sensing circuit, described touch-sensing circuit is for touch sensitive operation, and generation is corresponding tactileTouch sensing signal, define described touch-sensing circuit and the touch-sensing generating while touching operation do not detectedSignal is the first sensing signal;
The first compensating circuit, described the first compensating circuit is used for generating the first compensating signal, and described first mendsRepay signal and compensate for the touch-sensing signal that described touch-sensing circuit is generated, wherein, instituteStating the first compensating signal and the first sensing signal is with same frequency and reversed-phase signal, and described the first compensating signal is used for disappearingRemove or reduce described the first sensing signal, defining described touch-sensing signal and mend through described the first compensating signalSignal after repaying is the second sensing signal; With
Change-over circuit, described change-over circuit is used for obtaining described the second sensing signal, and by described the second senseSurvey signal and be converted to corresponding the 3rd sensing signal, to determine described touch according to described the 3rd sensing signalThe occurrence positions of operation; Described touch-sensing circuit is connected with described change-over circuit, described touch-sensing electricityBetween road and described change-over circuit, define a node, described the first compensating circuit is connected in described node, instituteState the first compensating circuit and export described compensating signal to described node, described in described touch-sensing circuit is exportedTouch-sensing signal is given described node, and described node is exported described the second sensing signal to described change-over circuit;
Described the first compensating circuit comprises current source, and described current source is connected with described node, described electric currentSource provides the first compensating signal to described node.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410658791.7A CN105677119A (en) | 2014-11-18 | 2014-11-18 | Capacitive touch screen and detection circuit thereof, electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410658791.7A CN105677119A (en) | 2014-11-18 | 2014-11-18 | Capacitive touch screen and detection circuit thereof, electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105677119A true CN105677119A (en) | 2016-06-15 |
Family
ID=56944396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410658791.7A Pending CN105677119A (en) | 2014-11-18 | 2014-11-18 | Capacitive touch screen and detection circuit thereof, electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105677119A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020130543A1 (en) * | 2018-12-18 | 2020-06-25 | 삼성전자 주식회사 | Electronic device for controlling touch sensing |
| CN111819528A (en) * | 2019-12-26 | 2020-10-23 | 深圳市汇顶科技股份有限公司 | Capacitance detection circuit, touch chip and electronic equipment |
| CN116301423A (en) * | 2023-02-28 | 2023-06-23 | 湖南锐阳电子科技有限公司 | Touch array reading circuit and method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101384981A (en) * | 2006-02-10 | 2009-03-11 | 夏普株式会社 | Touch panel coordinate position detection device |
| CN101937662A (en) * | 2008-10-30 | 2011-01-05 | 三星电子株式会社 | Touch controller, and display driving circuit and display device and system having the touch controller |
| CN102147678A (en) * | 2010-02-05 | 2011-08-10 | 三星电子株式会社 | Method and apparatus compensating noise in touch panel |
| CN102193695A (en) * | 2010-03-05 | 2011-09-21 | 启迪科技股份有限公司 | Touch panel test equipment and detecting device thereof |
| CN103294297A (en) * | 2012-10-11 | 2013-09-11 | 上海天马微电子有限公司 | Signal processing and pre-amplification circuit and touch screen |
| US20140009432A1 (en) * | 2012-07-09 | 2014-01-09 | Samsung Electrio-Mechanics Co., Ltd. | Capacitance sensing apparatus and method, and touchscreen apparatus |
-
2014
- 2014-11-18 CN CN201410658791.7A patent/CN105677119A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101384981A (en) * | 2006-02-10 | 2009-03-11 | 夏普株式会社 | Touch panel coordinate position detection device |
| CN101937662A (en) * | 2008-10-30 | 2011-01-05 | 三星电子株式会社 | Touch controller, and display driving circuit and display device and system having the touch controller |
| CN102147678A (en) * | 2010-02-05 | 2011-08-10 | 三星电子株式会社 | Method and apparatus compensating noise in touch panel |
| CN102193695A (en) * | 2010-03-05 | 2011-09-21 | 启迪科技股份有限公司 | Touch panel test equipment and detecting device thereof |
| US20140009432A1 (en) * | 2012-07-09 | 2014-01-09 | Samsung Electrio-Mechanics Co., Ltd. | Capacitance sensing apparatus and method, and touchscreen apparatus |
| CN103294297A (en) * | 2012-10-11 | 2013-09-11 | 上海天马微电子有限公司 | Signal processing and pre-amplification circuit and touch screen |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020130543A1 (en) * | 2018-12-18 | 2020-06-25 | 삼성전자 주식회사 | Electronic device for controlling touch sensing |
| CN111819528A (en) * | 2019-12-26 | 2020-10-23 | 深圳市汇顶科技股份有限公司 | Capacitance detection circuit, touch chip and electronic equipment |
| WO2021128204A1 (en) * | 2019-12-26 | 2021-07-01 | 深圳市汇顶科技股份有限公司 | Capacitance measurement circuit, touch chip, and electronic device |
| US11275468B2 (en) | 2019-12-26 | 2022-03-15 | Shenzhen GOODIX Technology Co., Ltd. | Capacitance detection circuit, touch control chip and electronic device |
| CN111819528B (en) * | 2019-12-26 | 2024-05-31 | 深圳市汇顶科技股份有限公司 | Capacitance detection circuit, touch chip and electronic equipment |
| CN116301423A (en) * | 2023-02-28 | 2023-06-23 | 湖南锐阳电子科技有限公司 | Touch array reading circuit and method |
| CN116301423B (en) * | 2023-02-28 | 2024-02-09 | 湖南锐阳电子科技有限公司 | Touch array reading circuit and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3502855B1 (en) | Capacitance detection device, touch device and terminal device | |
| US8928622B2 (en) | Demodulation method and system with low common noise and high SNR for a low-power differential sensing capacitive touch panel | |
| KR101169253B1 (en) | integrator circuit with inverting integrator and non-inverting integrator | |
| US8854107B2 (en) | Integrator circuit with inverting integrator and non-inverting integrator | |
| KR102020998B1 (en) | Capacitive Detection Device, Method and Pressure Detection System | |
| KR101349665B1 (en) | Display device with integrated touch screen | |
| JP6235649B2 (en) | Pressure sensing device, pressure detector and device including them | |
| EP3543668B1 (en) | Capacitance detection circuit, touch detection apparatus and terminal device | |
| CN102681743B (en) | Micro impedance change detection device | |
| US20130314370A1 (en) | Detecting method and device for suppressing interference of low-frequency noise | |
| JP5160502B2 (en) | Capacitive touch panel | |
| CN103823590A (en) | Driving circuit, touch device and touch module thereof and manufacturing method | |
| CN103339860A (en) | Capacitive proximity sensor as well as method for capacitive approximation detection | |
| CN103324366A (en) | Capacitor detection device and capacitive touch system applying same | |
| CN103324334A (en) | Detection device, detection method, program and display apparatus | |
| CN105677119A (en) | Capacitive touch screen and detection circuit thereof, electronic equipment | |
| KR101397848B1 (en) | Apparatus and method for sensing capacitance, and touchscreen apparatus | |
| KR20140017327A (en) | Apparatus for sensing capacitance, and touchscreen apparatus | |
| CN104484070A (en) | Driving circuit and driving method of touch device, touch device and display device | |
| JP5426429B2 (en) | Input device and display device including the same | |
| CN103823598A (en) | Touch sensing circuit and touch sensing method | |
| CN111819528A (en) | Capacitance detection circuit, touch chip and electronic equipment | |
| CN104199581B (en) | One kind is based on big CTP, little CTPCapacitive detection circuit and capacitance detecting device | |
| CN117519513A (en) | Low-voltage current type capacitance detection circuit, electronic chip, electronic equipment and display device | |
| CN105242804A (en) | Touch compensation circuit, compensating method for touch compensation circuit, touch screen and display apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160615 |