CN102541327A - Touch control sensing circuit and related method thereof - Google Patents
Touch control sensing circuit and related method thereof Download PDFInfo
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- CN102541327A CN102541327A CN2010106146969A CN201010614696A CN102541327A CN 102541327 A CN102541327 A CN 102541327A CN 2010106146969 A CN2010106146969 A CN 2010106146969A CN 201010614696 A CN201010614696 A CN 201010614696A CN 102541327 A CN102541327 A CN 102541327A
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Abstract
The invention relates to a touch control sensing circuit and a related method, which are used on a touch control sensor of a touch control display panel to detect common voltage change during the coupling of the display panel to the touch control sensor. The touch control sensor has a plurality of sensing electrodes, a plurality of channel circuits are arranged in the touch control sensing circuit, and each channel circuit has a resetting switch and a sensing switch for connecting a pair of sensing electrodes to a resetting voltage and a charge collecting circuit. The channel circuits are divided into different groups, the channel circuits in different groups operate in a crossed time sequence in order to cover all possible common voltage changes.
Description
Technical field
The present invention refers to especially that about a kind of touch control sensing circuit and correlation technique a kind of common voltage for panel of display that can in touch-control display panel, detect changes touch control sensing circuit and correlation technique to get rid of its influence.
Background technology
Touch-control display panel has combined the touch-control sensing function of touch control sensor and the Presentation Function of display panel, can control interface friendly, intuition be provided for the user, has become one of most popular man-computer interface of modern society.
Summary of the invention
The objective of the invention is to reduce the realization cost of touch-control sensing, and improve the degree of accuracy of touch-control sensing simultaneously.
The present invention provides a kind of touch control sensing circuit that applies to touch control sensor/touch-control display panel, is provided with a plurality of first channel circuits and second channel circuit.Each first channel circuit is provided with one first sense switch, one first and resets switch, one first charge circuit and an analog-to-digital converter.First resets switch is coupled to one first sensing electrode and one first and resets between the voltage, and first sense switch then is coupled between first sensing electrode and first charge circuit.First charge circuit is provided with a storage capacitors and an amplifier.Amplifier has positive input terminal, negative input end and output terminal, couples first sensing voltage in positive input terminal, is coupled to first sense switch in negative input end, and is coupled to analog-to-digital converter at output terminal.Storage capacitors is coupled between output terminal and the negative input end.The time point of first sense switch and the second sense switch conducting staggers each other.
Reset in the period first, the first not conducting of sense switch, first resets switch then resets voltage turn-on to the first sensing electrode with first.At first sensing in the period; First resets not conducting of switch; First sense switch is then with first sensing electrode conducting to the first charge circuit; First charge circuit can be coupled to first sensing electrode with first sensing voltage, with the charge-trapping of first sensing electrode in storage capacitors, the charge conversion that amplifier is collected according to storage capacitors goes out a corresponding simulating signal.
Each second channel circuit is provided with the analog-to-digital converter that one second sense switch, one second is reseted switch, one second charge circuit and a correspondence.Reset in the period second, the second not conducting of sense switch, second resets switch then resets voltage turn-on to the second sensing electrode with second.In period, second resets not conducting of switch at second sensing, and second sense switch then with second sensing electrode conducting to the second charge circuit, is coupled to second sensing electrode by second charge circuit with second sensing voltage.
Preferably, the first sensing period equated with the time length that the second sensing period kept, and beginning is then staggered with the opportunity that finishes each other, made second to reset the period and can covered in first sensing in the period, and first resets the period then betides second sensing in the period.
Preferably, first sensing voltage equals second and resets voltage, and second sensing voltage equals first and resets voltage, and first sensing voltage is not equal to first and resets voltage.The analog-to-digital converter of first channel circuit is reseted in the period (for example being to reset before the period will finish second) and is converted the analog sample of first charge circuit into corresponding digital signal second.In like manner, the analog-to-digital converter of second channel circuit converts corresponding digital signal at first analog sample reseted in the period second charge circuit.When the analog-to-digital converter of first channel circuit is taken a sample; Do not have voltage difference between first sensing electrode (conducting to the first sensing voltage) and second sensing electrode (voltage is reseted in conducting to the second), can avoid mutual coupling capacitive effect touch-control sensing and the detection of voltage change jointly between first, second sensing electrode.Likewise; When the analog-to-digital converter of second channel circuit is taken a sample; There is not voltage difference between second sensing electrode (conducting to the second sensing voltage) and first sensing electrode (voltage is reseted in conducting to the first), to get rid of the influence of mutual coupling electric capacity between sensing electrode yet.
The present invention also provides a kind of method that applies to touch control sensor/touch-control display panel, can detect the voltage transition of common voltage.Collect the signal amplitude size that electric charge is changed out in the first sensing period and the second sensing period respectively according to first charge circuit and second charge circuit, whether betide the first sensing period and/or the second sensing period with the voltage transition that determines common voltage.
For further understanding characteristic of the present invention and technology contents, see also following about detailed description of the present invention and accompanying drawing, yet accompanying drawing only provides reference and explanation, is not to be used for the present invention is limited.
Description of drawings
The present invention will obtain more deep understanding by attached drawings and explanation:
Fig. 1 has shown the touch control sensing circuit according to the embodiment of the invention.
Fig. 2 has shown that common voltage changes sequential.
Fig. 3 has shown the sequential according to the touch control sensing circuit running of the embodiment of the invention.
Fig. 4 has shown the sensing method of touch control flow process according to the embodiment of the invention.
The main element symbol description
10 touch control sensing circuits, 12 touch control sensors
14 display panels, 16 touch-control display panels
100 flow process 102-108 steps
SC1, SC2 channel circuit
CV1, CV2 capacitance voltage change-over circuit
ADC1, ADC2 analog-to-digital converter
OP1, OP2 amplifier N1a-N1c, N2a-N2c node
Ca, Cb, Cr1-Cr2, Cu electric capacity VH, VL, VA, VB voltage
SE1, SE2 sensing electrode SG common voltage electrode
Ra, Rb resistance S1-S4 switch
Vcom common voltage La-Lc, L1-L2 current potential
Ta1-ta8, ts1-ts2, t0-t9, t0 '-t5 ' time point
P1-P4, Ta-Td, Dt, Dd, Dt ', Dt " period
T1, T2, T3 cycle Vo1-Vo2, D1-D2 signal
Vcom1-Vcom3 waveform dV0-dV4 voltage difference
Embodiment
Please refer to the 1st figure, what it was illustrated is according to embodiment of the invention touch control sensing circuit 10, applies to touch-control display panel 16, and it has integrated a touch control sensor 12 and a display panel 14.Be provided with the sensing electrode of a plurality of mutually insulateds in the touch control sensor 12, in order to the sensing touch-control.In this embodiment, a plurality of sensing electrodes in the touch control sensor 12 are classified as array, in each group one or more sensing electrode are arranged.Come to represent respectively two not on the same group sensing electrodes with sensing electrode SE1 and SE2 among Fig. 1.For sensing electrode SE1, be provided with the channel circuit SC1 of a correspondence in the touch control sensing circuit 10; For sensing electrode SE2, a corresponding channel circuit SC2 is arranged also in the touch control sensing circuit 10.
In channel circuit SC1, be provided with a capacitance voltage change-over circuit CV1 and an analog-to-digital converter ADC1.Being provided with switch S 1 and S2, capacitor C r1 and amplifier OP1 among the capacitance voltage change-over circuit CV1, for example is operational amplifier.Switch S 1 is coupled between a voltage VH (it can be provided by the certain voltage source) and the node N1a, is coupled to sensing electrode SE1 via node N1a.2 of switch S are coupled between node N1a and the node N1b.Capacitor C r1 and amplifier OP1 provide a charge circuit; Amplifier OP1 has a positive input terminal and a negative input end, and at node N1c one output terminal is arranged.The positive input terminal of amplifier OP1 is coupled to a voltage VL (it can decide voltage source by another provides), and negative input end then is coupled to switch S 2 in node N1b.The two ends of capacitor C r1 are coupled to negative input end and the output terminal of amplifier OP1 respectively at node N1b and N1c, analog-to-digital converter ADC1 then is coupled to the output terminal of amplifier OP1 at node N1c.
Fig. 1 has also illustrated the time sequences of switch S 1 and S2, and it periodically repeats the two period P1 and the period P2 that overlap according to one-period T1.Fixed value voltage VH can be considered and resets voltage, resets the period so period P1 can be considered; Reset among the period P1 at this, switch S 2 not conductings, as 1 of the switch S of reseting switch with sensing electrode SE1 conducting to reseting voltage VH.At period P2, switch S 1 not conducting, as 2 of the switch S of sense switch with sensing electrode SE1 conducting to charge circuit.Under the effect of amplifier OP1, the voltage of its two input end can make voltage VL be coupled to node N1b, and be coupled to sensing electrode SE1 via the switch S 2 of conducting because of the mutual convergence of virtual ground (virtual ground).Under the effect of voltage VL, the capacitance change of sensing electrode SE1 can react on electric charge; These electric charges can be injected among the capacitor C r1, the number of the quantity of electric charge are converted to the voltage swing of node N1c.In other words, the simulating signal Vo1 that pair amplifier OP1 is exported at node N1c, its amplitude size is just represented the total electrical charge variable quantity of sensing electrode SE1 accumulative total in period P2, and period P2 just can be considered the sensing period in the cycle T 1.The time point ts1 of analog-to-digital converter ADC1 in each cycle T 1 takes a sample to signal Vo1, to be converted into corresponding digital signal D1.
Be similar to the channel circuit SC1 of sensing electrode SE1, the pairing channel circuit SC2 of sensing electrode SE2 also is provided with a capacitance voltage change-over circuit CV2 and an analog-to-digital converter ADC2.As reseting switch and sense switch, amplifier OP2 and capacitor C r2 provide a charge circuit respectively for switch S 3 and S4, at node N2c output signal Vo2.Also illustrated the time sequences of switch S 3 and S4 among Fig. 1, it repeats the two period P3 and the P4 (be respectively and reset period and sensing period) that are connected according to one-period T2.Concerning channel circuit SC2, voltage VL resets voltage for it; In period P3, switch S 4 not conductings, switch S 3 via node N2a with voltage VL conducting to sensing electrode SE2.In period P4; Switch S 3 not conductings; 4 of switch S with sensing electrode SE2 conducting to amplifier OP2; Make voltage VH (sensing voltage) be coupled to sensing electrode SE2, the Charge Storage of sensing electrode SE2 to capacitor C r2, is made the total electrical charge variable quantity of the big I reaction of signal amplitude sensing electrode SE2 accumulative total in period P4 of node N2c via node N2b.The digital to analog converter ADC2 then time point ts2 in each cycle T 2 takes a sample to signal Vo2 and changes, and produces signal D2, and preferably, cycle T 1 equates with T2 essence, and the phase mutually synchronization.
In Fig. 1, display panel 14 utilizes a common voltage electrode SG transmission common voltage Vcom.Therefore, between sensing electrode SE1 and common voltage electrode SG, will form an equivalent capacitor C a, resistance R a then leads because of in the resistance and relevant dead resistance of sensing electrode SE1 itself; Sensing electrode SE2 and common voltage electrode SG then form another equivalent capacity Cb and resistance R b.Via capacitor C a and Cb, common voltage Vcom will be coupled respectively to sensing electrode SE1 and SE2.In addition, also can form the equivalent capacity Cu of mutual coupling between sensing electrode SE1 and the SE2.
Capacitance type touch control sensor 12 is a plurality of sensing electrodes to be set respond to because of the caused capacitance variations of user's touch-control in sensing region, and then analyzes the position of touch that receives touch-control.When inductance capacitance changes, periodically reset period and sensing in the period with each sensing electrode respectively conducting to preset voltage and the charge circuit reseted.Reseting in the period, the voltage potential of sensing electrode is being reset to the preset voltage of reseting; Arrived the sensing period, sensing electrode is coupled to another preset sensing voltage, the voltage difference of reseting between voltage and sensing voltage can act on the capacitance change that sensing electrode is coupled to, and causes the change of electric charge.Collect the electric charge of each sensing electrode in period at sensing, convert the analog sample of quantity of electric charge representative into corresponding digital signal, just can be according to these Digital Signal Analysis position of touch.
Be show image, display panel 14 can be for pixel switch on pixel driving voltage and common voltage Vcom, with driving pixels.Common voltage Vcom is the shared voltage of pixel, and the common voltage electrode SG of conduction common voltage Vcom can extend whole display panel 14 in the common voltage conductor layer.When touch control sensor 12 and display panel 14 are integrated into touch-control display panel 16; The sensing electrode of mutually insulated (like SE1 or SE2) can form two electrodes of equivalent capacity (like Ca or Cb) with common voltage conductor layer, and the common voltage Vcom of common voltage conductor layer also will be capacitively coupled to sensing electrode via this equivalence.
For driving each pixel, common voltage Vcom can present periodically stepped waveform.Preferably, when carrying out touch-control sensing, the cycle (like T1 or T2) of reseting period and sensing period can be shorter than the cycle of common voltage Vcom, and both can be not synchronous yet.If common voltage Vcom all is maintained same current potential reseting period and sensing in the period; Even sensing electrode is coupled to common voltage Vcom; Voltage difference intersegmental when reseting period and sensing still can meet the expection voltage difference of reseting between voltage and sensing voltage, so collect the capacitance variations that the signal of electric charge gained can correctly react touch-control.On the contrary; If common voltage Vcom changes its current potential at sensing in the period; The current potential that sensing electrode intersegmental voltage difference when reseting period and sensing will be mixed common voltage changes, and does not meet expection, collects the result that respective signal that electric charge produced also can't the correct response touch-control sensing.
For avoiding common voltage Vcom to change the touch-control sensing mistake that is caused, the present invention can detect the change of common voltage Vcom in the lump when carrying out touch-control sensing, to get rid of the influence that common voltage Vcom changes.At sensing in the period; When voltage difference that common voltage changes acts on sensing electrode and the equivalent capacity between the voltage conductor layer jointly; The change in electrical charge amount that it caused can change whether betided this sensing in the period so the present invention can detect common voltage by the number of electric charge greater than the reasonable change in electrical charge amount of touch-control sensing.
Have rise time that common voltage changes and fall time various variations (for example be because of display panel processing procedure, temperature, WV and/or structure cause); Mutually do not relate to the sensing period of touch-control sensing the opportunity of taking place, the voltage difference of common voltage Vcom change not necessarily can complete reaction at same sensing in the period.Preferably, arrange the staggered sensing period of sequential, can observe all change opportunitys of common voltage Vcom at different sensing electrodes.
Fig. 2 illustration common voltage Vcom is periodically with each pixel of stepped drive waveform, and transverse axis is the time, longitudinal axis representative voltage size.Common voltage Vcom repeats day part Ta to Td according to one-period T3.In period Ta, common voltage Vcom can be maintained at current potential La.Between time point ta1 to ta2, common voltage Vcom rises to another current potential Lb with one liter of edge, continues in period Tb, to keep current potential Lb.Between time point ta3 to ta4, common voltage Vcom rises to current potential Lc, and sustained periods of time Tc.Between time point ta5 to ta6, a negative edge takes place in common voltage Vcom, makes it drop to current potential Lb and keeps period Td, and between time point ta7 to ta8, drop to current potential La once again.
Please be simultaneously with reference to figure 1; Because touch-control sensing is different with the demand of pixel drive, preferably, the cycle T 1 of touch-control sensing is shorter than the cycle T 3 of driving pixels with T2, and cycle T 1 can be not synchronous with T2 and cycle T 3 yet.In Td, each period all can be contained a plurality of cycle T 1 at each period Ta of cycle T 3.When carrying out touch-control sensing; If common voltage Vcom all is maintained same current potential reseting period and sensing in the period; The common voltage even sensing electrode has been coupled; Voltage difference intersegmental when reseting period and sensing still can meet the expection voltage difference of reseting between voltage and sensing voltage, so can correctly react the capacitance variations of touch-control sensing.For example, when the period P1 that is connected when two of cycle T 1 covered among the period Tb with P2, the signal of node N1c is the result of ability correct response touch-control sensing just.On the other hand, if common voltage Vcom changes its current potential at sensing in the period, sensing electrode intersegmental voltage difference when reseting period and sensing will be mixed the current potential change of common voltage Vcom, and does not meet expection, result that can't the correct response touch-control sensing.For example, if a certain period P2 of cycle T 1 has crossed over time point ta3 to ta4, the voltage of common voltage Vcom changes the touch-control sensing that (Lc-Lb) will influence this period P2.
Whether change for avoiding common voltage Vcom change to cause touch-control sensing mistake, touch control sensing circuit 10 when carrying out touch-control sensing, to pick out common voltage Vcom, to get rid of the influence that common voltage changes.With sensing electrode SE1 and channel circuit SC1 is that example is explained; Because the equivalent capacity Ca between sensing electrode SE1 and the common voltage electrode SG can be several times as much as the capacitance change of touch-control sensing; And the voltage change amount of common voltage Vcom is also greater than normal touch-control sensing voltage difference (being the difference between voltage VH and VL) down, makes that the change in electrical charge amount that is caused because of the common voltage change among the capacitor C a can be greater than the reasonable change in electrical charge amount of touch-control sensing.In this embodiment, can detect the common voltage change by the electric charge number that reacts among signal Vo1 and the signal D1 and whether betide among the sensing period P2.Preferably, can stipulate a threshold value according to the change in electrical charge amount of common voltage change and the reasonable change in electrical charge amount of touch-control sensing; If in a certain period P2; The signal magnitude that signal Vo1 is reflected among the signal D1 surmounts threshold value; Then represent common voltage Vcom in this period P2, to change current potential, the signal D1 that this period P2 is measured is influenced by the common voltage change, preferably; Should abandon the signal D1 that this period P2 is measured, change the touch-control sensing mistake that causes to avoid common voltage.
Because opportunity and change speed that common voltage change to take place have various variations, in this embodiment, the time sequences of channel circuit SC1 and SC2 is staggered each other, to contain various possible common voltages changes.Please be simultaneously with reference to figure 3 and Fig. 1, what Fig. 3 illustrated is the time sequences of touch control sensing circuit 10, its transverse axis is represented the time.In this embodiment, the cycle T 1 of channel circuit SC1 is identical with cycle T 2 essence of channel circuit SC2, and also essence is identical to reset the time length of period P1 and P3, sensing period P2 and P4, and the mistiming of a period Dt and Dd is arranged each other.That is to say that when channel circuit SC1 opens after the beginning one resets period P1, channel circuit SC2 just opens and begins that it resets period P3 behind period Dt; When channel circuit SC2 opens after the beginning, it reseted period P3, channel circuit SC1 can wait and begin for time one in time one-period after the period Dd again and reset period P1, and period Dt can equate with Dd or be unequal.As shown in Figure 3; Such scheduling meeting makes reseting in the sensing period P4 that period P1 betides channel circuit SC2 of channel circuit SC1; Make reseting among the sensing period P2 that period P3 covered in channel circuit SC1 of channel circuit SC2; It is partly overlapping that the sensing period P4 of sensing period P2 and the channel circuit SC2 of channel circuit SC1 is had to each other, period Dt ' and Dt " can equate or unequal.When channel circuit SC1 and SC2 operate on separately reset the period time, all can not carry out sensing; If common voltage change to take place during to reset the period overlapping with a certain channel circuit a certain, common voltage Vcom resets the voltage difference that changes in the period at this just can not be reacted to this channel circuit, detection and discriminating that influence changes common voltage.But; Because this resets the period can be overlapping with the sensing period of another channel circuit; So common voltage still can react to another channel circuit in this change of reseting in the period, and staggered channel circuit SC1 and the SC2 of sequential just can operate to see that arbitrary common voltage changes.
In Fig. 3, when common voltage Vcom shown in waveform Vcom1, begin to rise by current potential L1 at time point t0 ', when time point t2 ', arrive current potential L2, the voltage difference dV0 of its change just equals (L2-L1).With respect to the operation period T1 of channel circuit SC1 because the change of common voltage Vcom is slow, the part of waveform Vcom1 can with time point t3 to t4 to reset period P1 overlapping.In the sensing period of time point t0 to t3 P2, have only voltage difference dV1 partly can be reacted to channel circuit SC1; And in time sensing period P2 of time point t4 to t7, also have only voltage difference dV2 partly to be reacted to channel circuit SC1.Preferably, by staggered scheduling, channel circuit SC2 can detect the voltage difference dV0 that common voltage changes in the sensing period of time point t2 to t5 P4; Even voltage difference dV1 and dV2 be not enough to differentiated by channel circuit SC1, channel circuit SC2 still can be in the sensing period of time point t2 to t5 P4 detects the change of common voltage according to voltage difference dV0.
In Fig. 3, when common voltage Vcom shown in waveform Vcom2, at time point t1 ' to rising to current potential L2 by current potential L1 between t4 '.Concerning channel circuit SC1, the leading portion of waveform Vcom2 is hidden from view by the period P1 that resets of time point t3 to t4, and then has voltage difference dV3 partly to be reacted to channel circuit SC1 at the sensing period of time point t4 to t7 P2.Similarly, concerning channel circuit SC2, the back segment of waveform Vcom2 can be covered the reseting among the period P3 of time point t5 to t6, and the part voltage difference dV4 of leading portion then can be reacted to channel circuit SC2 in the sensing period of time point t2 to t5 P4.Because the equivalent capacity Ca/Cb between sensing electrode SE1/SE2 and the common voltage electrode SG can be several times as much as the capacitance change of touch-control sensing; And voltage difference dV3 and dV4 can detect common voltage in view of the above and change also greater than the voltage difference (being the difference between voltage VH and VL) under the normal touch-control sensing.
In Fig. 3; If common voltage Vcom follows waveform Vcom3 at time point t3 ' to changing between t5 '; Though channel circuit SC2 between time point t5 to t6 reset period P3 can hide waveform Vcom3 in the middle of partly; But channel circuit SC1 can detect common voltage at the sensing period of time point t4 to t7 P2 to be changed, to abandon the data that is interfered.
Please be simultaneously with reference to figure 1 and Fig. 3, also illustrated the voltage VA of node N1b and the voltage VB of node N2b among Fig. 3.Preferably, the analog-to-digital converter ADC1 of channel circuit SC1 is that the simulating signal Vo1 sampling of reseting among the period P3 node N1c at channel circuit SC2 converts corresponding digital signal D1 into; For example, analog-to-digital converter ADC1 can take a sample the time point ts1 that finishes reseting period P3.In like manner, the analog-to-digital converter ADC2 of channel circuit SC2 converts signal Vo2 sampling into corresponding digital signal D2 reseting among the period P1 of channel circuit SC1; For example, the time point ts2 that finishes is taken a sample reseting period P1.Arrange according to this sequential, when analog-to-digital converter ADC1 took a sample in period P3, sensing electrode SE1 was by the voltage VA of switch S 2 conductings to node N1b, and via amplifier OP1 virtual ground to voltage VL; Sensing electrode SE2 then by switch S 3 conductings to voltage VL.So, between sensing electrode SE1 and SE2, just do not have voltage difference, influence touch-control sensing and the detection of voltage change jointly via signal D1 with the capacitor C u that avoids mutual coupling between two sensing electrodes.Likewise; When the analog-to-digital converter ADC2 of channel circuit SC2 takes a sample in period P1; Sensing electrode SE1 by switch S 1 conducting to voltage VH; Sensing electrode SE2 then is coupled to voltage VH via switch S 4 with amplifier OP2, and the voltage difference between sensing electrode SE1 and the SE2 of preventing is to get rid of the influence of mutual coupling capacitor C u between sensing electrode.
Fig. 4 shows the flow process 100 that realizes touch control sensing circuit 10 among Fig. 1 according to the embodiment of the invention, comprising:
Step 102: each channel circuit in the touch control sensing circuit is divided into groups, and be the staggered sequential of each group channel circuit setting.
Step 104: make not on the same group channel circuit according to staggered sequential running.For example; If in the touch control sensing circuit 22 channel circuits are arranged; Can it be divided into two groups; Wherein 11 channel circuits are according to the sequential running of channel circuit SC1 (Fig. 1), and other 11 channel circuits are then according to the sequential running of channel circuit SC2, to carry out touch-control sensing at separately sensing period P2 and P4.
Step 106: whether the voltage change of differentiating common voltage according to the principle of before having mentioned takes place.
Step 108: if the touch-control sensing bearing reaction common voltage of the channel circuit of certain group in certain sensing period changes, then abandon the touch-control sensing result of this period, not in order to calculate the coordinate of position of touch.Preferably, the relevant touch-control sensing result of all channel circuits before and after this sensing period can be dropped.With Fig. 3 is example; The common voltage that detects waveform Vcom1 as the sensing period P4 of channel circuit SC2 between time point t2 to t5 changes; Channel circuit SC2 abandons the signal D2 that takes a sample among this sensing period P4; Channel circuit SC1 also abandons the signal D1 that obtains between time point t0 to t3, time point t4 to t7, that is to say, the numeral output that the common voltage of adjacent waveforms Vcom1 changes is all discardable.On the other hand, do not change, represent that these signals are not totally disturbed by common voltage, calculate the coordinate of position of touch with regard to the signal of all channel circuit sensing gained capable of using if the channel circuit of each group all detects common voltage.But step 104 was pulled over to 108 cycles, and the immediate reaction user is at the touch-control of touch control sensor 12.Step 108 and/or step 102 can not undertaken by the digital processing element in the touch control sensing circuit 10 (being shown in figure).
In summary; The present invention can detect the change of common voltage for panel of display in touch-control display panel, utilize all common voltages of touch-control sensing identification of staggered sequential to change, and avoids the result that common voltage changes influences touch-control sensing; Make touch-control sensing more accurate, also can reduce production costs.
In sum, though the present invention discloses as above with preferred embodiment, so it is not in order to limit the present invention; Anyly be familiar with present technique field person; Do not breaking away from the spirit and scope of the present invention, when can doing various changes and retouching, so protection scope of the present invention should be defined by claims.
Claims (15)
1. touch control sensing circuit includes:
A plurality of first channel circuits, each first channel circuit includes:
One first charge circuit; And
One first sense switch is coupled between one first sensing electrode and this first charge circuit; Can be when this first sense switch conducting with this first sensing electrode conducting to this first charge circuit; And
A plurality of second channel circuits, each second channel circuit includes:
One second charge circuit; And
One second sense switch is coupled between one second sensing electrode and this second charge circuit; Can be during this second sense switch conducting with this second sensing electrode conducting to this second charge circuit, and the ON time point of this first sense switch and this second sense switch staggers each other.
2. touch control sensing circuit as claimed in claim 1 is characterized in that, each first channel circuit also includes:
One first resets switch, is coupled to this first sensing electrode and one first and resets between the voltage; This first is reseted switch and this first is not reseted voltage turn-on to this first sensing electrode during conducting at this first sense switch.
3. touch control sensing circuit as claimed in claim 2 is characterized in that, each second channel circuit also includes:
One second resets switch, is coupled to this second sensing electrode and one second and resets between the voltage; This second is reseted switch and this second is not reseted voltage turn-on to this second sensing electrode during conducting at this second sense switch.
4. touch control sensing circuit as claimed in claim 3 is characterized in that, this first is reseted voltage and this second to reset voltage different.
5. touch control sensing circuit as claimed in claim 3 is characterized in that, when this first sense switch conducting, this first charge circuit can be coupled to this first sensing electrode with one first sensing voltage; When this second sense switch conducting, this second charge circuit can be coupled to this second sensing electrode with one second sensing voltage; Wherein, this first sensing voltage equals this and second resets voltage, and this first is reseted voltage and equal this second sensing voltage.
6. touch control sensing circuit as claimed in claim 5 is characterized in that, this first charge circuit includes a storage capacitors and an amplifier; This amplifier has a positive input terminal, a negative input end and an output terminal; This storage capacitors is coupled between this output terminal and this negative input end; This first sense switch is coupled to this amplifier in this negative input end, and this first sensing voltage is coupled to this amplifier in this positive input terminal.
7. touch control sensing circuit as claimed in claim 6 is characterized in that, each first channel circuit also comprises an analog-to-digital converter, is coupled to this output terminal; This analog-to-digital converter second converts the sample of signal of this output terminal into corresponding digital signal when reseting switch conduction at this.
8. touch control sensing circuit as claimed in claim 1 is characterized in that, this first sense switch is identical with the time length of this second sense switch conducting, and this first sense switch and this second sense switch can not begin conducting simultaneously.
9. a sensing method of touch control is applied to a touch-control display panel, is provided with the common voltage electrode that a plurality of sensing electrodes and have a common voltage, and this method includes:
In period, collect the electric charge in each sensing electrode at a sensing, and the charge conversion of collecting the signal of a correspondence; And
Amplitude size according to those signals determines whether the change of this common voltage betides this sensing in the period.
10. method as claimed in claim 9 is characterized in that, those sensing electrodes comprise a plurality of first sensing electrodes and a plurality of second sensing electrode, collects the electric charge of those first sensing electrodes in the period and those signals according to the charge conversion of collecting at this sensing.
11. method as claimed in claim 10 is characterized in that, also includes:
Set another sensing period, this sensing period and this another sensing period can not begun simultaneously;
In period, collect the electric charge of those second sensing electrodes at this another sensing, and the secondary signal of a plurality of correspondences according to the charge conversion of collecting; And
Amplitude size according to those secondary signals determines whether the change of this common voltage betides this another sensing in the period.
12. method as claimed in claim 11 is characterized in that, also comprises: when setting this another sensing during the period, the time length that another sensing period of this sensing period and this is kept equates.
13. method as claimed in claim 11 is characterized in that, also comprises:
Reset in the period one first, reset voltage turn-on to those first sensing electrodes one first;
Reset in the period one second, reset voltage turn-on to those second sensing electrodes one second;
In period, those first sensing electrodes are coupled to one first sensing voltage at this sensing; And
In period, those second sensing electrodes are coupled to one second sensing voltage at this another sensing.
14. method as claimed in claim 13 is characterized in that, this first sensing voltage equals this and second resets voltage, and this second sensing voltage equals this and first resets voltage.
15. method as claimed in claim 14 is characterized in that, also comprises:
Second reset in the period in this, convert those samples of signal into corresponding first digital signal; And
First reset in the period in this, convert those secondary signals samplings into corresponding second digital signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010614696.9A CN102541327B (en) | 2010-12-20 | 2010-12-20 | Touch control sensing circuit and related method thereof |
Applications Claiming Priority (1)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108170315A (en) * | 2014-03-19 | 2018-06-15 | 原相科技股份有限公司 | The sensing device further of drive signal can be resend |
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| US20070091013A1 (en) * | 2005-10-26 | 2007-04-26 | Samsung Electronics Co., Ltd. | Liquid crystal display and method thereof |
| US20090115737A1 (en) * | 2007-11-05 | 2009-05-07 | Epson Imaging Devices Corporation | Display device and electronic apparatus |
| CN101470556A (en) * | 2007-12-26 | 2009-07-01 | 三星电子株式会社 | Display device and method of driving the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070091013A1 (en) * | 2005-10-26 | 2007-04-26 | Samsung Electronics Co., Ltd. | Liquid crystal display and method thereof |
| US20090115737A1 (en) * | 2007-11-05 | 2009-05-07 | Epson Imaging Devices Corporation | Display device and electronic apparatus |
| CN101470556A (en) * | 2007-12-26 | 2009-07-01 | 三星电子株式会社 | Display device and method of driving the same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108170315A (en) * | 2014-03-19 | 2018-06-15 | 原相科技股份有限公司 | The sensing device further of drive signal can be resend |
| CN108170315B (en) * | 2014-03-19 | 2021-01-05 | 原相科技股份有限公司 | Sensing device capable of resending driving signal |
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| CN102541327B (en) | 2015-04-29 |
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