CN102541327B - Touch control sensing circuit and related method thereof - Google Patents
Touch control sensing circuit and related method thereof Download PDFInfo
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- CN102541327B CN102541327B CN201010614696.9A CN201010614696A CN102541327B CN 102541327 B CN102541327 B CN 102541327B CN 201010614696 A CN201010614696 A CN 201010614696A CN 102541327 B CN102541327 B CN 102541327B
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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 about a kind of touch control sensing circuit and correlation technique, espespecially a kind of can in touch-control display panel detection display panel common voltage change with get rid of its impact touch control sensing circuit and correlation technique.
Background technology
Touch-control display panel combines the touch-control sensing function of touch control sensor and the Presentation Function of display floater, can provide control interface that is friendly, intuition, become one of most popular man-computer interface of modern society for user.
Summary of the invention
What the object of the invention is to reduction touch-control sensing realizes cost, and improves the accuracy of touch-control sensing simultaneously.
The invention provides a kind of touch control sensing circuit applying to touch control sensor/touch-control display panel, be provided with multiple first channel circuit and the 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 voltage, and the first sense switch is then coupled between the first sensing electrode and the 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, couples the first sensing voltage in positive input terminal, is coupled to the first sense switch, and is coupled to analog-to-digital converter at output in negative input end.Storage capacitors is coupled between output and negative input end.The time point of the first sense switch and the second sense switch conducting offsets one from another.
Reset in the period first, the first sense switch not conducting, first resets switch then resets voltage turn-on to the first sensing electrode by first.In the first sensing period, first resets switch not conducting, first sense switch is then by the first sensing electrode conducting to the first charge circuit, first sensing voltage can be coupled to the first sensing electrode by the first charge circuit, with by the charge-trapping of the first sensing electrode in storage capacitors, make amplifier go out the analog signal of a correspondence according to the charge conversion that storage capacitors is collected.
Each second channel circuit is provided with the analog-to-digital converter that one second sense switch, one second resets switch, one second charge circuit and a correspondence.Reset in the period second, the second sense switch not conducting, second resets switch then resets voltage turn-on to the second sensing electrode by second.In the second sensing period, second resets switch not conducting, and the second sensing voltage then by the second sensing electrode conducting to the second charge circuit, is coupled to the second sensing electrode by the second charge circuit by the second sense switch.
Preferably, it is equal that the first sensing period and second sense the time length that the period maintains, and the opportunity of beginning and end then staggers mutually, makes second to reset the period and can covered in the first sensing period, and first resets the period then betided in the second sensing period.
Preferably, the first sensing voltage equals second and resets voltage, and the second sensing voltage equals first and resets voltage, and the first sensing voltage is not equal to first resets voltage.The sampling of the analog signal of the first charge circuit is converted to corresponding data signal by (being for example reset before the period will terminate second) second reseting in the period for the analog-to-digital converter of the first channel circuit.In like manner, the analog-to-digital converter of the second channel circuit is reseted in the period first and the sampling of the analog signal of the second charge circuit is converted to corresponding data signal.When the analog-to-digital converter of the first channel circuit samples, voltage difference is not had, the detection cross-coupling capacitance between first, second sensing electrode can being avoided to affect touch-control sensing and common voltage change between the first sensing electrode (conducting to the first sensing voltage) and the second sensing electrode (voltage is reseted in conducting to the second).Similarly, when the analog-to-digital converter of the second channel circuit samples, voltage difference is not had, to get rid of the impact of cross-coupling capacitance between sensing electrode between the second sensing electrode (conducting to the second sensing voltage) and the first sensing electrode (voltage is reseted in conducting to the first) yet.
The present invention also provides a kind of method applying to touch control sensor/touch-control display panel, can detect the voltage transition of common voltage.According to the first charge circuit and the second charge circuit respectively first sense the period and second sense the period collect electric charge the signal amplitude size changed out, to determine whether the voltage transition of common voltage betides the first sensing period and/or the second sensing period.
For can further understand feature of the present invention and technology contents, refer to following detailed description for the present invention and accompanying drawing, but accompanying drawing only provides reference and explanation, is not used for being limited the present invention.
Accompanying drawing explanation
The present invention by following accompanying drawing and explanation, will obtain more deep understanding:
Fig. 1 shows the touch control sensing circuit according to the embodiment of the present invention.
Fig. 2 shows common voltage and changes sequential.
Fig. 3 shows the sequential operated according to the touch control sensing circuit of the embodiment of the present invention.
Fig. 4 shows the sensing method of touch control flow process according to the embodiment of the present invention.
Main element symbol description
10 touch control sensing circuit 12 touch control sensors
14 display floater 16 touch-control display panels
100 flow process 102-108 steps
SC1, SC2 channel circuit
CV1, CV2 capacitance-voltage conversion 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
Detailed description of the invention
Please refer to the 1st figure, what it was illustrated is according to embodiment of the present invention touch control sensing circuit 10, applies to touch-control display panel 16, and it incorporates touch control sensor 12 and a display floater 14.The sensing electrode of multiple mutually insulated is provided with, in order to sense touch-control in touch control sensor 12.In this embodiment, the multiple sensing electrodes in touch control sensor 12 are classified as array, have one or more sensing electrode in each group.Represent the sensing electrode of two different groups respectively with sensing electrode SE1 and SE2 in Fig. 1.For sensing electrode SE1, in touch control sensing circuit 10, be provided with the channel circuit SC1 of a correspondence; For sensing electrode SE2, in touch control sensing circuit 10, also there is a corresponding channel circuit SC2.
An a capacitance-voltage conversion circuit CV1 and analog-to-digital converter ADC1 is provided with in channel circuit SC1.Being provided with switch S 1 and S2, electric capacity Cr1 and amplifier OP1 in capacitance-voltage conversion circuit CV1, such as, is operational amplifier.Switch S 1 is coupled between a voltage VH (it can be provided by certain voltage source) and node N1a, is coupled to sensing electrode SE1 via node N1a.Switch S 2 is coupled between node N1a and node N1b.Electric capacity Cr1 and amplifier OP1 provides a charge circuit; Amplifier OP1 has a positive input terminal and a negative input end, and has an output at node N1c.The positive input terminal of amplifier OP1 is coupled to a voltage VL (it can determine voltage source by another provides), and negative input end is then coupled to switch S 2 in node N1b.The two ends of electric capacity Cr1 are coupled to negative input end and the output of amplifier OP1 respectively at node N1b and N1c, analog-to-digital converter ADC1 is then coupled to the output of amplifier OP1 at node N1c.
Fig. 1 also illustrates the time sequences of switch S 1 and S2, and it periodically repeats the two period P1 overlapped and period P2 according to a cycle T 1.Fixed value voltage VH can be considered and resets voltage, therefore period P1 can be considered and resets the period; Reset in period P1 at this, switch S 2 not conducting, as the switch S 1 reseting switch by sensing electrode SE1 conducting to reseting voltage VH.At period P2, switch S 1 not conducting, as the switch S 2 of sense switch by sensing electrode SE1 conducting to charge circuit.Under the effect of amplifier OP1, the voltage of its two input can because of virtual ground (virtual ground) mutual convergence, make voltage VL be coupled to node N1b, and be coupled to sensing electrode SE1 via the switch S 2 of conducting.Under the effect of voltage VL, the capacitance change of sensing electrode SE1 can react on electric charge; These electric charges can be injected in electric capacity Cr1, the number of the quantity of electric charge are converted to the voltage swing of node N1c.In other words, for the analog signal Vo1 that amplifier OP1 exports at node N1c, its amplitude size just represents sensing electrode SE1 total electrical charge variable quantity accumulative in period P2, and period P2 just can be considered the sensing period in cycle T 1.The time point ts1 of analog-to-digital converter ADC1 in each cycle T 1 samples signal Vo1, to be converted into corresponding data signal D1.
Be similar to the channel circuit SC1 of sensing electrode SE1, the channel circuit SC2 corresponding to sensing electrode SE2 is also provided with an a capacitance-voltage conversion circuit CV2 and analog-to-digital converter ADC2.Switch S 3 and S4 are respectively as reseting switch and sense switch, and amplifier OP2 and electric capacity Cr2 provides a charge circuit, output signal Vo2 at node N2c.Also illustrate the time sequences of switch S 3 and S4 in Fig. 1, it repeats period P3 and the P4 (be respectively and reset period and sensing period) of two linkings according to a cycle T 2.Concerning channel circuit SC2, voltage VL resets voltage for it; In period P3, switch S 4 not conducting, switch S 3 via node N2a by voltage VL conducting to sensing electrode SE2.In period P4, switch S 3 not conducting, switch S 4 by sensing electrode SE2 conducting to amplifier OP2, voltage VH (sensing voltage) is made to be coupled to sensing electrode SE2 via node N2b, by the charge storage of sensing electrode SE2 to electric capacity Cr2, make the total electrical charge variable quantity that the signal amplitude of node N2c large I reaction sensing electrode SE2 is accumulative in period P4.The time point ts2 of digital to analog converter ADC2 then in each cycle T 2 carries out sampling to signal Vo2 and changes, and produce signal D2, preferably, cycle T 1 is equal with T2 essence, and phase mutually synchronization.
In FIG, display floater 14 utilizes a common voltage electrode SG to transmit common voltage Vcom.Therefore, will form an equivalent capacity Ca between sensing electrode SE1 and common voltage electrode SG, resistance Ra then leads because of in the resistance of sensing electrode SE1 itself and associated parasitic resistance; Sensing electrode SE2 and common voltage electrode SG then forms another equivalent capacity Cb and resistance Rb.Via electric capacity Ca and Cb, common voltage Vcom will be coupled respectively to sensing electrode SE1 and SE2.In addition, the equivalent capacity Cu of mutual coupling can also be formed between sensing electrode SE1 and SE2.
Capacitance type touch control sensor 12 arranges multiple sensing electrode in the sensing region to respond to the capacitance variations because of caused by user's touch-control, and then analyze the position of touch by touch-control.When inductance capacitance changes, periodically reset the period with sensing the period in by each sensing electrode respectively conducting to preset reset voltage and charge circuit.Reseting in the period, the voltage potential of sensing electrode is being reset to and default resets voltage; Arrived the sensing period, sensing electrode is coupled to the sensing voltage that another is preset, the voltage difference reseted between voltage and sensing voltage can act on the capacitance change that sensing electrode is coupled to, and causes the change of electric charge.In the sensing period, collect the electric charge of each sensing electrode, the analog signal sampling representated by the quantity of electric charge is converted to corresponding data signal, just can according to these Digital Signal Analysis position of touch.
For show image, display floater 14 can be pixel switch on pixel driving voltage and common voltage Vcom, to drive pixel.Common voltage Vcom is the voltage that pixel shares, and the common voltage electrode SG of conduction common voltage Vcom can extend whole display floater 14 in common voltage conductor layer.When touch control sensor 12 is integrated into touch-control display panel 16 with display floater 14, sensing electrode (as SE1 or SE2) meeting and the common voltage conductor layer of mutually insulated form two electrodes of equivalent capacity (as Ca or Cb), 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 staircase waveform.Preferably, when carrying out touch-control sensing, reseting the period can be shorter than the cycle of common voltage Vcom with the cycle (as T1 or T2) of sensing period, and both also can not be synchronous.If common voltage Vcom reset the period with sensing the period in be all maintained same current potential, even if sensing electrode is coupled to common voltage Vcom, voltage difference intersegmental when reseting the period and sense still can meet the expection voltage difference reseted between voltage and sensing voltage, therefore the signal collecting electric charge gained correctly can react the capacitance variations of touch-control.On the contrary, if common voltage Vcom changes its current potential in the sensing period, sensing electrode changes reseting the current potential that period and intersegmental voltage difference during sensing will mix common voltage, and does not meet expection, and the respective signal that collection electric charge produces also cannot the result of correct response touch-control sensing.
For avoiding common voltage Vcom to change the touch-control sensing mistake 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 impact that common voltage Vcom changes.In the sensing period, the voltage difference changed when common voltage acts on the equivalent capacity of sensing electrode and common voltage conductor interlayer, the charge variation amount that it causes can be greater than the reasonable charge variation amount of touch-control sensing, thus the present invention can by the number of electric charge detect common voltage change whether betided this sensing period in.
Have the rise time that common voltage changes and fall time various variation (being for example because the processing procedure of display floater, temperature, operating voltage and/or structure cause), occur opportunity do not relate to mutually with the sensing period of touch-control sensing, common voltage Vcom change voltage difference not necessarily can complete reaction in the same sensing period.Preferably, in the sensing period that different sensing electrodes arranges sequential staggered, the change opportunity that common voltage Vcom is all can be observed.
Fig. 2 illustrates common voltage Vcom and periodically drives each pixel with staircase waveform, and transverse axis is the time, longitudinal axis representative voltage size.Common voltage Vcom repeats day part Ta to Td according to a cycle T 3.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 to maintain current potential Lb in period Tb.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, there is a trailing edge in common voltage Vcom, makes it drop to current potential Lb and maintain period Td, and drop to current potential La once again between time point ta7 to ta8.
Please also refer to Fig. 1; Because touch-control sensing is different from the demand of pixel driver, preferably, the cycle T 1 of touch-control sensing is shorter than driving the cycle T 3 of pixel with T2, and cycle T 1 also can not be synchronous with T2 and cycle T 3.In each period Ta to Td of cycle T 3, each period can contain multiple cycle T 1.When carrying out touch-control sensing, if common voltage Vcom reset the period with sensing the period in be all maintained same current potential, the common voltage even if sensing electrode has been coupled, voltage difference intersegmental when reseting the period and sense still can meet the expection voltage difference reseted between voltage and sensing voltage, therefore correctly can react the capacitance variations of touch-control sensing.For example, when two of cycle T 1 be connected period, P1 and P2 covered in period Tb time, the result of the signal of node N1c just energy correct response touch-control sensing.On the other hand, if common voltage Vcom changes its current potential in the sensing period, sensing electrode changes reseting the current potential that period and intersegmental voltage difference during sensing will mix common voltage Vcom, and does not meet expection, cannot the result of correct response touch-control sensing.For example, if a certain period P2 of cycle T 1 spans time point ta3 to ta4, the voltage of common voltage Vcom changes the touch-control sensing that (Lc-Lb) will affect this period P2.
For avoiding common voltage Vcom change to cause touch-control sensing mistake, whether touch control sensing circuit 10 can pick out common voltage Vcom and change when carrying out touch-control sensing, to get rid of the impact that common voltage changes.Illustrate for sensing electrode SE1 and channel circuit SC1, because the equivalent capacity Ca between sensing electrode SE1 and common voltage electrode SG can be several times as much as the capacitance change of touch-control sensing, and the voltage knots modification of common voltage Vcom is also greater than the voltage difference (difference namely between voltage VH and VL) under normal touch-control sensing, make in electric capacity Ca because common voltage changes the reasonable charge variation amount that the charge variation amount caused can be greater than touch-control sensing.In this embodiment, can change whether to betide sense in period P2 to detect common voltage by the electric charge number reacted in signal Vo1 and signal D1.Preferably, the charge variation amount that can change according to common voltage and the reasonable charge variation amount of touch-control sensing stipulate a threshold value; If in a certain period P2, the signal magnitude that signal Vo1 reacts in signal D1 surmounts threshold value, then represent common voltage Vcom and change current potential in this period P2, this period P2 the signal D1 that measures by common voltage change affect, preferably, should abandon this period P2 the signal D1 that measures, change to avoid common voltage the touch-control sensing mistake caused.
The opportunity occurred due to common voltage change and change speed have various variation, in this embodiment, the time sequences of channel circuit SC1 and SC2 are mutually staggered, and change to contain various possible common voltage.Please also refer to Fig. 3 and Fig. 1, Fig. 3 signal be the time sequences of touch control sensing circuit 10, its horizontal axis plots time.In this embodiment, the cycle T 1 of channel circuit SC1 is identical with cycle T 2 essence of channel circuit SC2, resets period P1 and P3, also essence is identical for the time length of sensing period P2 and P4, and have the time difference of a period Dt and Dd each other.That is, when channel circuit SC1 opens after the beginning one resets period P1, channel circuit SC2 just opens and begins that it resets period P3 after period Dt; Begin after it resets period P3 when channel circuit SC2 opens, channel circuit SC1 time one in time cycle that start again after waiting period Dd resets period P1, and period Dt and Dd can be equal or unequal.As shown in Figure 3, such scheduling can make the period P1 that resets of channel circuit SC1 betide in the sensing period P4 of channel circuit SC2, the period P3 that resets of channel circuit SC2 is made to covered in the sensing period P2 of channel circuit SC1, also the sensing period P2 of channel circuit SC1 and the sensing period P4 of channel circuit SC2 is made to have part overlapping to each other, period Dt ' and Dt " can be equal or unequal.When channel circuit SC1 and SC2 operate on respective reset the period time, all can not sense; If common voltage change occur during to reset the period overlapping with a certain channel circuit a certain, common voltage Vcom resets the voltage difference changed in the period would not be reacted to this channel circuit at this, affects the detection to common voltage change and discriminating.But, due to this reset the period can be overlapping with the sensing period of another channel circuit, therefore the change that common voltage is reseted in the period at this still can be reacted to another channel circuit, and channel circuit SC1 and the SC2 that sequential is interlocked just can operate to see that arbitrary common voltage changes.
In Fig. 3, when common voltage Vcom is as shown in waveform Vcom1, rise at time point t0 ' by current potential L1, arrive current potential L2 when time point t2 ', its voltage difference dV0 changed just equals (L2-L1).Relative to the operation period T1 of channel circuit SC1, because the change of common voltage Vcom is slow, a part of waveform Vcom1 can with time point t3 to t4 to reset period P1 overlapping.In the sensing period P2 of time point t0 to t3, the voltage difference dV1 of part is only had to be reacted to channel circuit SC1; And in a time sensing period P2 of time point t4 to t7, also only have the voltage difference dV2 of part 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 P4 of time point t2 to t5; Even if voltage difference dV1 and dV2 is not enough to be differentiated by channel circuit SC1, channel circuit SC2 still can detect the change of common voltage in the sensing period P4 of time point t2 to t5 according to voltage difference dV0.
In Fig. 3, when common voltage Vcom is as shown in waveform Vcom2, between time point t1 ' to t4 ', rise to current potential L2 by current potential L1.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, then has the voltage difference dV3 of part to be reacted to channel circuit SC1 at the sensing period P2 of time point t4 to t7.Similarly, concerning channel circuit SC2, the back segment of waveform Vcom2 can be covered and reset in period P3 at 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 P4 of time point t2 to t5.Because the equivalent capacity Ca/Cb between sensing electrode SE1/SE2 and common voltage electrode SG can be several times as much as the capacitance change of touch-control sensing, and voltage difference dV3 and dV4 is also greater than the voltage difference (difference namely between voltage VH and VL) under normal touch-control sensing, can detect that common voltage changes accordingly.
In Fig. 3, if common voltage Vcom follows waveform Vcom3 and changes between time point t3 ' to t5 ', although channel circuit SC2 between time point t5 to t6 reset period P3 can hide waveform Vcom3 in the middle of part, but channel circuit SC1 can detect that common voltage changes, to abandon the data be interfered at the sensing period P2 of time point t4 to t7.
Please also refer to Fig. 1 and Fig. 3, in Fig. 3, also illustrate the voltage VA of node N1b and the voltage VB of node N2b.Preferably, the analog signal Vo1 of node N1c sampling is converted to corresponding data signal D1 reseting in period P3 of channel circuit SC2 by the analog-to-digital converter ADC1 of channel circuit SC1; For example, analog-to-digital converter ADC1 can sample reseting the time point ts1 of period P3 by end.In like manner, signal Vo2 sampling is converted to corresponding data signal D2 reseting in period P1 of channel circuit SC1 by the analog-to-digital converter ADC2 of channel circuit SC2; For example, sample reseting the time point ts2 of period P1 by end.According to this scheduling, when analog-to-digital converter ADC1 samples in period P3, sensing electrode SE1 by switch S 2 conducting to the voltage VA of node N1b, and via amplifier OP1 virtual ground to voltage VL; Sensing electrode SE2 then by switch S 3 conducting to voltage VL.So, between sensing electrode SE1 and SE2, just there is no voltage difference, affect via signal D1 the detection that touch-control sensing and common voltage change to avoid the electric capacity Cu of mutual coupling between two sensing electrodes.Similarly, when the analog-to-digital converter ADC2 of channel circuit SC2 samples in period P1, sensing electrode SE1 by switch S 1 conducting to voltage VH, sensing electrode SE2 is then coupled to voltage VH via switch S 4 and amplifier OP2, the voltage difference of preventing between sensing electrode SE1 and SE2, to get rid of the impact of cross-coupling capacitance Cu between sensing electrode.
Fig. 4 display realizes the flow process 100 of touch control sensing circuit 10 in Fig. 1 according to the embodiment of the present invention, comprising:
Step 102: by each channel circuit grouping in touch control sensing circuit, and be the sequential that each group of channel circuit setting interlocks.
Step 104: make the channel circuit of different group according to the running of staggered sequential.For example, if there are 22 channel circuits in a touch control sensing circuit, two groups can be divided into, wherein 11 channel circuits operate according to the sequential of channel circuit SC1 (Fig. 1), other 11 channel circuits then operate according to the sequential of channel circuit SC2, to carry out touch-control sensing at respective sensing period P2 and P4.
Step 106: differentiate that the voltage of common voltage changes according to previously mentioned principle and whether occur.
Step 108: if the channel circuit of certain group changes at the touch-control sensing bearing reaction common voltage of certain sensing period, 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 all can be dropped.For Fig. 3, when the sensing period P4 of channel circuit SC2 between time point t2 to t5 detects that the common voltage of waveform Vcom1 changes, the signal D2 sampled in this sensing period P4 abandons by channel circuit SC2, the signal D1 obtained between time point t0 to t3, time point t4 to t7 also abandons by channel circuit SC1, that is, the numeral that the common voltage of adjacent waveforms Vcom1 changes exports all discardable.On the other hand, if the channel circuit of each group does not all detect that common voltage changes, represent these signals clean not disturb by common voltage, the signal of all channel circuits sensing gained just can be utilized to calculate the coordinate of position of touch.Step 104 can be pulled over to 108 in the cycle, and immediate reaction user is at the touch-control of touch control sensor 12.Step 108 and/or step 102 can be undertaken by the digital processing element (not being shown in figure) in touch control sensing circuit 10.
In summary, the present invention can the change of detection display panel common voltage in touch-control display panel, utilizes all common voltages of touch-control sensing identification of staggered sequential to change, avoids common voltage to change the result affecting touch-control sensing, make touch-control sensing more accurate, also can reduce production cost.
In sum, although the present invention with preferred embodiment disclose as above, so itself and be not used to limit the present invention; anyly be familiar with the art person; without departing from the spirit and scope of the present invention, when doing various change and retouching, therefore protection scope of the present invention should be defined by claims.
Claims (10)
1. a touch control sensing circuit, includes:
Multiple first channel circuit, each first channel circuit includes:
One first charge circuit;
One first sense switch, is coupled between one first sensing electrode and this first charge circuit; Can by this first sensing electrode conducting to this first charge circuit when this first sense switch conducting; And
One first resets switch, is coupled to this first sensing electrode and one first and resets between voltage; This first is reseted switch, when the non-conducting of this first sense switch, this first is reseted voltage turn-on to this first sensing electrode; And
Multiple second channel circuit, each second channel circuit includes:
One second charge circuit;
One second sense switch, is coupled between one second sensing electrode and this second charge circuit; Can by this second sensing electrode conducting to this second charge circuit during this second sense switch conducting, and the ON time point of this first sense switch and this second sense switch offsets one from another; And
One second resets switch, is coupled to this second sensing electrode and one second and resets between voltage; This second is reseted switch, when the non-conducting of this second sense switch, this second is reseted voltage turn-on to this second sensing electrode;
When this first sense switch conducting, one first sensing voltage can be coupled to this first sensing electrode by this first charge circuit; When this second sense switch conducting, one second sensing voltage can be coupled to this second sensing electrode by this second charge circuit; Wherein, this first sensing voltage equals this and second resets voltage, and this first is reseted voltage and equal this second sensing voltage;
Wherein this first reset voltage and this second to reset voltage different.
2. touch control sensing circuit as claimed in claim 1, it 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, this storage capacitors is coupled between this output 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.
3. touch control sensing circuit as claimed in claim 2, it is characterized in that, each first channel circuit also comprises an analog-to-digital converter, is coupled to this output; This analog-to-digital converter this second reset switch conduction time the sample of signal of this output is converted to corresponding data signal.
4. touch control sensing circuit as claimed in claim 1, it 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 start conducting simultaneously.
5. a sensing method of touch control, is applied to a touch-control display panel, is provided with multiple first sensing electrode, common voltage electrode that multiple second sensing electrode and has a common voltage, and the method includes:
In one first sensing period, collect the electric charge respectively in this first sensing electrode, and the charge conversion of collection is gone out the first signal of a correspondence;
In one second sensing period, collect the electric charge respectively in this second sensing electrode, and the charge conversion of collection is gone out the secondary signal of a correspondence; And
Determine whether the change of this common voltage betides this and first to sense in the period according to the amplitude size of those the first signals and those secondary signals and a predetermined threshold value.
6. method as claimed in claim 5, is characterized in that, also include:
Set this first sensing period and this second senses the period and can not start simultaneously; And
Determine whether the change of this common voltage betides this and second to sense in the period according to the amplitude size of those the first signals and those secondary signals and this predetermined threshold value.
7. method as claimed in claim 6, is characterized in that, also comprise: when setting this second sensing period, and second to sense the time length that the period maintains equal with this to make this first sensing period.
8. method as claimed in claim 6, is characterized in that, also comprise:
Reset in the period one first, reset voltage turn-on by one first to those the first sensing electrodes;
Reset in the period one second, reset voltage turn-on by one second to those the second sensing electrodes;
In this first sensing period, those first sensing electrodes are coupled to one first sensing voltage; And
In this second sensing period, those second sensing electrodes are coupled to one second sensing voltage.
9. method as claimed in claim 8, 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.
10. method as claimed in claim 9, is characterized in that, also comprise:
Second reset in the period in this, those samples of signal are converted to the first corresponding data signal; And
First reset in the period in this, the sampling of those secondary signals is converted to the second corresponding data signal.
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| US9256332B2 (en) * | 2014-03-19 | 2016-02-09 | Pixart Imaging Inc. | Concurrent driving capacitive touch sensing device capable of resending drive signals |
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| JP4433035B2 (en) * | 2007-11-05 | 2010-03-17 | エプソンイメージングデバイス株式会社 | Display device and electronic device |
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