CN101847070A - Capacitance change detection module taking electric signal change time as detection target - Google Patents
Capacitance change detection module taking electric signal change time as detection target Download PDFInfo
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- RHZWSUVWRRXEJF-UHFFFAOYSA-N indium tin Chemical compound [In].[Sn] RHZWSUVWRRXEJF-UHFFFAOYSA-N 0.000 description 1
- MRNHPUHPBOKKQT-UHFFFAOYSA-N indium;tin;hydrate Chemical compound O.[In].[Sn] MRNHPUHPBOKKQT-UHFFFAOYSA-N 0.000 description 1
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- XOFYZVNMUHMLCC-ZPOLXVRWSA-N prednisone Chemical compound O=C1C=C[C@]2(C)[C@H]3C(=O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 XOFYZVNMUHMLCC-ZPOLXVRWSA-N 0.000 description 1
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Abstract
The invention provides a capacitance change detection module taking electric signal change time as a detection target, which is used for detecting touching actions on a mutual capacitance touch screen. In particular, the capacitance change detection module comprises a scan signal detection capacitor, a constant current charging module, a capacitance charging control switch, a charging detection module, a response time detection module and a charging feedback module electrically connected with both ends of a capacitor to be detected, wherein the response time detection module is used for outputting the time when the scan signal detection capacitor is charged to a charging threshold value to the output end of the capacitance change detection module. The capacitance change detection module takes the electric signal change time as the detection target and the change of the capacitance can be detected before the circuit is in a stable state, so the change of the capacitance can be detected as early as possible; and, the capacitance change detection module also has the advantages of lowering requirements on the trace resistance of the touch screen and the time for building the capacitance change detection module, simplifying circuit structure and saving chip area.
Description
Technical field
The present invention relates to the device for fast detecting of electric signal, particularly relate to and be used for the detection module that mutual capacitance touchscreens changes with the mutual capacitance that detects touch action and cause.
Background technology
It is the capacitance variation that the touch action to touch-screen is converted into that prior art is used for capacitive touch screen, determines the device of input information then.Described touch-screen all comprises the module that is used to detect capacitance variations, is used in time detecting the generation of touch action, and this is the precondition that touch-screen accurately and timely produces output data.Therefore, described capacitance change detection module has determined the response speed of touch-screen to touch action.The prior art mutual capacitance touchscreens, as shown in Figure 5, comprise electrode group, pumping signal module 20 ' and mutual capacitance data detection module 90 ', described electrode group comprise the drive electrode 70 that is electrically connected with described pumping signal module ' and sensing electrode 80 of being electrically connected with described mutual capacitance data detection module '.As shown in Figure 6, described pumping signal module 20 ' be used to send sweep signal to each drive electrode 70 ', thereby drive electrode 70 ' and sensing electrode 80 ' between form mutual capacitance C
MThe described mutual capacitance C of described mutual capacitance data detection module 90 ' be used to detect
MVariation, and timely and accurately the delta data and the position data of mutual capacitance are exported to corresponding data processing device.Described capacitance change detection module 10 ' be exactly mutual capacitance data detection module 90 ' a part, be used in time finding the variation of mutual capacitance, and with the capacitance variations data transmission that detects give data processing module 30 ', this data processing module 30 ' mutual capacitance delta data is treated as reflection touch action centre coordinate data.
The described capacitance change detection module 10 of prior art ' all be to be detected object with the change in electric, as shown in Figure 7, described capacitance change detection module 10 ' comprise operational amplifier 11 ', detect capacitor C
S, and signal conversion module 12 '.The mutual capacitance C of touch-screen
MElectrical connection connect described operational amplifier 11 ' reverse input end-; Described detection C
SBe connected across operational amplifier 11 ' reverse input end-and output terminal; Described operational amplifier 11 ' input end in the same way+connect reference power source U
Ref, its output terminal receive described signal conversion module 12 ', this signal conversion module 12 ' effect be with detected signal quantization, give at last data processing module 30 ', described data processing module 30 ' normally miniature data processing unit MCU.Described capacitance change detection module 10 ' several important node be mutual capacitance C
MWith pumping signal module 20 ' be electrically connected part, promptly this pumping signal module 20 ' output terminals A ' point, described operational amplifier 11 ' reverse input end-, i.e. B ' point, and this operational amplifier 11 ' output terminal, i.e. C ' point.As shown in Figure 8, be respectively waveform WA ', WB ', the WC ' of above-mentioned three node correspondences when touch-screen is not touched, and the waveform WC of C ' when take place touching ".Described pumping signal module 20 ' send sweep signal from A ', waveform is a square wave, and high level is VDDH, and low level is 0.When rising edge arrived, because the existence of mutual capacitance CM, B ' point voltage can and then have a step to rise because described operational amplifier 11 ' the short characteristic of void, its output terminal can flow out electric current to detecting capacitor C
S, make B ' point voltage return to in-phase input end+reference power source U
RefEquate.By the series connection partial pressure properties of electric capacity, and stable back B ' point voltage is constant, has after voltage is stable,
Δ V
ABe A ' voltage variety, Δ V
CIt is C ' voltage variety.C ' point voltage V
CIntermediate value be U
Ref, therefore, V
COutput high level VOH is
Low level VOL is
This level again by described signal conversion module 12 ' quantification give data processing module 30 '.Because U
Ref, V
AAnd C
SAll be fixed value, compare by the result and the factory setting value of comparison signal modular converter 12 ' output, if variation has taken place in its value, i.e. decidable mutual capacitance C
MVariation has taken place, and touch event has taken place in touch-screen fully, can calculate the amplitude of variation by above formula, and can draw the coordinate of touch point according to the row of correspondence scanning, the row of detection.Shown in the waveform of C ' among Fig. 8, solid line is the waveform WC ' that touch does not take place, and dotted line is that the waveform WC that touches has taken place ".As can be seen, their central values equate that the voltage amplitude of the row that generation touches is littler than what do not touch.
Described capacitance change detection module 10 ' also exists following defective and weak point:
1. by above-mentioned detection scheme process as can be known, what it detected is a stationary value, i.e. the flat of C ' some waveform among Fig. 8.Therefore it is to requiring than higher the Time Created of touch-screen and capacitance change detection module 10 ' inside, wish A ' send sweep signal after, can respond C ' point as early as possible, and stable as early as possible, give the signal conversion module 12 of back ' do quantization operation to guarantee more time.As shown in Figure 6, the cabling of line scan signals on touch-screen be tin indium oxide IndiumTin Oxide normally, is called for short ITO, its conductivity is less, and it is bigger to walk line resistance, causes walking wire delay big, this point is more obvious on larger-size touch apparatus, sends from sweep signal and arrives C
MTherefore required time is long, adopts the prior art capacitance change detection module 10 ' line resistance of walking of touch-screen is required than higher; Same reason, to described capacitance change detection module 10 ' in operational amplifier 11 ' Time Created higher requirement also arranged;
2. in order to realize the higher detection precision, described signal conversion module 12 ' can adopt the ∑ structure usually, its inside comprises integrator, subsignal modular converter, sub-decoding scheme, and a large amount of digital modulation and demodulation circuit, area occupied is considerable.
Summary of the invention
The technical problem to be solved in the present invention is to avoid the deficiencies in the prior art part and proposes a kind of saving cost, reduction is to the requirement of the parasitic parameter of touch-screen, reduction is to the requirement of the Time Created of operational amplifier, and reduce the complicacy of testing circuit and chip area with the change in electric time be the capacitance change detection module of detected object.
The present invention solve the technical problem can be by realizing by the following technical solutions:
Designing, making a kind of is the capacitance change detection module of detected object with the change in electric time, be used to detect the touch action that mutual capacitance touchscreens takes place, the input end of described capacitance change detection module is electrically connected one of two battery lead plates that form the touch-screen mutual capacitance, and another battery lead plate of this mutual capacitance is electrically connected the sweep signal output terminal of pumping signal module; The output terminal of described capacitance change detection module is electrically connected data processing module.Especially, described capacitance change detection module comprises that sweep signal detects electric capacity, constant-current charge module, electric capacity charging control switch, charging detection module and response time detection module, and is connected electrically in the charging feedback module that detects the electric capacity two ends.Described sweep signal detects electric capacity and is connected electrically between the input end and constant-current charge module of described capacitance change detection module.Described charging feedback module is used for when the step electric signal of the input end that detects described capacitance change detection module, control described electric capacity charging control switch and connect described charging detection module, and the change in electric that sweep signal detects electric capacity shifted export this charging detection module to, the sweep signal that described step electric signal is exported by the pumping signal module causes.Described constant-current charge module is used for that described sweep signal is detected electric capacity and carries out constant-current charge.Described charging detection module is used to detect the charge condition that sweep signal detects electric capacity, and when reaching charge threshold, the timing that outputs signal to described response time detection module finishes input end.The timing of described response time detection module begins the sweep signal output terminal that input end is electrically connected the pumping signal module, is used for described sweep signal is detected the output terminal that time that the electric capacity charging reaches charge threshold exports described capacitance change detection module to.Whether described data processing module compares the time data of capacitance change detection module output with the time data of presetting, touched to judge mutual capacitance touchscreens.
Described electric capacity charging control switch is an insulating gate type field effect tube, or triode.
Scheme more specifically, described charging feedback module is first comparator/operational amplifier, and described constant-current charge module is a current source, and described electric capacity charging control switch is the P-channel enhancement type insulating gate type field effect tube; Described charging detection module is second comparator/operational amplifier.The input end in the same way of described first comparator/operational amplifier is electrically connected the input end of described capacitance change detection module, the reverse input end of this first comparator/operational amplifier is electrically connected first reference power source, and the output terminal of described first comparator/operational amplifier is electrically connected the grid of described P-channel enhancement type insulating gate type field effect tube.Described sweep signal detects the input end that electric capacity one end is electrically connected described capacitance change detection module, and the other end is electrically connected the reverse input end of the drain electrode of described P-channel enhancement type insulating gate type field effect tube, described second comparator/operational amplifier and the current output terminal of described current source.The source electrode of described P-channel enhancement type insulating gate type field effect tube and substrate are electrically connected the power supply of described capacitance change detection module.The input end in the same way of described second comparator/operational amplifier is electrically connected second reference power source, and the timing that its output terminal is electrically connected described response time detection module finishes input end.
In addition, described response time detection module comprises more than one d type flip flop, parallel-to-serial converter, latch and two not gates.Begin the input end input signal inputs to all d type flip flops through two not gates clear terminal from the timing of described response time detection module.The inverse output terminal of each d type flip flop is electrically connected the input end of self, all d type flip flops are electrically connected by the mode serial that output terminal is electrically connected next d type flip flop clock end, the clock end of first d type flip flop is electrically connected the clock that described capacitance change detection module provides, and d type flip flop output terminal separately is not electrically connected the parallel data input end of described parallel-to-serial converter.Described parallel-to-serial converter output data is to described latch; The latch instruction of this latch finishes input end from the timing of described response time detection module and obtains, described latch output be latched the output data that data are exactly described response time detection module.
Compare with prior art, the present invention's's " is the capacitance change detection module of detected object with the change in electric time " technique effect is:
1. the present invention is a detected object with the change in electric time, need after entering stable state, circuit just not detect capacitance variations, make capacitance variations be detected as early as possible, simultaneously, reduced requirement the Time Created of walking line resistance and capacitance change detection module of touch-screen.
2. the present invention has simplified circuit structure, has saved chip area.
Description of drawings
Fig. 1 is the electric schematic block diagram of the present invention's " is the capacitance change detection module of detected object with the change in electric time ";
Fig. 2 is the circuit theory synoptic diagram of first embodiment of the invention;
Fig. 3 is each node waveform synoptic diagram of described first embodiment;
Fig. 4 is the circuit theory synoptic diagram of the response time detection module 15 of second embodiment of the invention;
Fig. 5 is the synoptic diagram of prior art mutual capacitance touchscreens;
Fig. 6 is the mutual capacitance principle schematic of prior art mutual capacitance touchscreens;
Fig. 7 be prior art capacitance change detection module 10 ' the circuit theory synoptic diagram;
Fig. 8 is the oscillogram of each node among Fig. 7.
Embodiment
Be described in further detail below in conjunction with each embodiment shown in the accompanying drawing.
The present invention propose a kind of with the change in electric time be the capacitance change detection module of detected object, be used to detect the touch action that mutual capacitance touchscreens takes place, as shown in Figure 1, the input end B of described capacitance change detection module 10 is electrically connected and forms touch-screen mutual capacitance C
MOne of two battery lead plates, this mutual capacitance C
MAnother battery lead plate be electrically connected the sweep signal output terminals A of pumping signal module 20.The output terminal E of described capacitance change detection module 1 is electrically connected data processing module 30.
Described capacitance change detection module 10 comprises that sweep signal detects capacitor C
S, constant-current charge module 12, electric capacity charging control switch 13, charging detection module 14 and response time detection module 15, and be connected electrically in the detection capacitor C
SThe charging feedback module 11 at two ends.Described sweep signal detects capacitor C
SBe connected electrically between the input end B and constant-current charge module 12 of described capacitance change detection module 10.Described charging feedback module 11 is used for when the step electric signal of the input end B that detects described capacitance change detection module 10, controls described electric capacity charging control switch 13 and connects described charging detection module 14, and sweep signal is detected capacitor C
SChange in electric shift and to export this charging detection module 14 to, the sweep signal that described step electric signal is exported by pumping signal module 20 causes.Described constant-current charge module 12 is used for described sweep signal is detected capacitor C
SCarry out constant-current charge.Described charging detection module 14 is used to detect sweep signal and detects capacitor C
SCharge condition, when reaching charge threshold, the timing that outputs signal to described response time detection module 15 finishes input end T
EThe timing of described response time detection module 15 begins input end T
SBe electrically connected the sweep signal output terminals A of pumping signal module 20, be used for described sweep signal is detected capacitor C
SThe time that charging reaches charge threshold exports the output terminal E of described capacitance change detection module 10 to.Whether described data processing module 30 compares the time data of capacitance change detection module 10 outputs with the time data of presetting, touched to judge mutual capacitance touchscreens.The present invention is a detected object with the change in electric time, need just not detect capacitance variations after circuit enters stable state, makes capacitance variations be detected as early as possible.
Described electric capacity charging control switch 13 can be an insulating gate type field effect tube, can also be triode.
First embodiment of the invention proposes a kind of concrete scheme, as shown in Figure 2, described charging feedback module 11 is first comparator/operational amplifier OP, and described constant-current charge module 12 is current source SC, and described electric capacity charging control switch 13 is P-channel enhancement type insulating gate type field effect tube M; Described charging detection module 14 is second comparator/operational amplifier CMP.The input end B of the described capacitance change detection module 10 of input end+electrical connection in the same way of the described first comparator/operational amplifier OP, the reverse input end of this first comparator/operational amplifier OP-electrical connection first reference power source U
Ref1, the output terminal of the described first comparator/operational amplifier OP is electrically connected the grid g of described P-channel enhancement type insulating gate type field effect tube M.Described sweep signal detects capacitor C
SOne end is electrically connected the input end B of described capacitance change detection module 10, and the other end is electrically connected the drain electrode d of described P-channel enhancement type insulating gate type field effect tube M, the reverse input end of the described second comparator/operational amplifier CMP-and current output terminal of described current source SC.The source electrode s of described P-channel enhancement type insulating gate type field effect tube M and substrate B are electrically connected the power supply V of described capacitance change detection module 10
DDThe input end in the same way of the described second comparator/operational amplifier CMP+electrical connection second reference power source U
Ref2, the timing that its output terminal is electrically connected described response time detection module 15 finishes input end T
E
Described response time detection module 15 is used for detecting the A point and sends sweep signal, surpasses the required time of (or being lower than) Uref2 to the C point voltage.Typical case and simple time detection circuit be, counts by the system clock of a high frequency, by calculating A point and rise (or decline) when arriving, up to D point the required clock number that overturns takes place, and can obtain detecting the time delay that electric capacity charges and causes.
In the described capacitance change detection module 10, the voltage relationship after 3 of A, B, C are stable and the consistent A ' of prior art scheme, B ', C ' are basic identical.The edge that difference is, i.e. change procedure, as shown in Figure 3.Wherein in the waveform that C, D are ordered, solid line is waveform WC and the WD that touch does not take place, and dotted line is that the waveform WC that touches has taken place
CAnd WD
C, as can be seen, having or not to touch, the required time delay of D point upset is different.
When the rising edge of ordering as A arrived, described response time detection module 15 picked up counting.Because capacitance voltage stabilizing, the B point is drawn high, described first comparator/operational amplifier output high level, and current source SC is with electric current I
CBegin to C
SDischarge returns to the in-phase end voltage U until the B point
Ref1Equate.In this process, the C point voltage is linear to descend, as the turnover voltage U that is lower than the second comparator/operational amplifier CMP
Ref2The time, its output terminal D overturns, and time detection circuit stops timing, and gives data processing module 30 with timing result.In fact, the time course of detection is: the C point is reduced to U from high level
Ref2The required time.Because charging current I
CConstant, and have or not the level reference position that touch takes place different, the therefore required duration of charging is different.
As mentioned above, the voltage after the C point is stable is basic identical with the prior art scheme, so high level is
And the upset level is U
Ref2, therefore the required duration of charging is,
In the following formula, has only the mutual capacitance C on the touch apparatus
MBe variable, therefore,, can judge whether touch event takes place by detecting the time delay that D is ordered.According to the scanning frame frequency, by regulating C
S, I
CAnd Vref2, the changes delta t of time delay after t and the touch can be set in a rational value, both can guarantee that t and Δ t maintained a bigger value and be more conducive to measure, can guarantee again that comparer necessarily reversed before the sweep signal negative edge arrives, guarantee to finish a sense cycle.In addition,, increase the shared ratio of high level, can further increase the value of t and Δ t, be more convenient for measuring by regulating the dutycycle of A spot scan signal.
Said process is an example with the rising edge that detection A is ordered just, in fact also can detect negative edge, as long as current source SC is changed into the PMOS current source, the output stage of the first comparator/operational amplifier OP is received N type isolated gate FET (or NPN type triode) get final product, and higher the getting final product that the low level dutycycle of sweep signal is established.
Second embodiment of the invention as shown in Figure 4, proposes the physical circuit example of described response time detection module 15.Described response time detection module 15 comprise more than one d type flip flop DT1 ..., DTm, parallel-to-serial converter 151, latch 152 and two not gates 153,154, m is a natural number.Begin input end T from the timing of described response time detection module 15
SInput signal inputs to the clear terminal CLR of all d type flip flops through two not gates 153,154.The inverse output terminal of each d type flip flop
Be electrically connected the input end D of self, all d type flip flops are electrically connected by the mode serial that output terminal Q is electrically connected next d type flip flop clock end CLK, the clock end CLK of first d type flip flop is electrically connected the clock ck that described capacitance change detection module 10 provides, and d type flip flop output terminal Q separately is electrically connected the parallel data input end of described parallel-to-serial converter 151 respectively.Described parallel-to-serial converter 151 output datas are to described latch 152; The latch instruction of this latch 152 finishes input end TE from the timing of described response time detection module 15 and obtains, described latch 152 outputs be latched the output data that data are exactly described response time detection module 15.Described response time detection module 15 is to use the High Speed System clock that it is counted, and from rising edge, finishes to negative edge.Detection begins input end T from timing
SThe input significant level begins to finishing input end T from timing
ECover what (scale-of-two) ck cycles in the input significant level terminal procedure.When timing begins input end T
SDuring the input significant level, the counter O reset that d type flip flop constitutes begins counting when its rising edge arrives, obtain S
0,, S
1..., S
N-1, S
n, transfer it to serial output, finish input end T up to timing
EDuring the input significant level, latches data and output, the detection of one-period is finished in the counter zero clearing again that d type flip flop constitutes.Described data processing module 30 compares the result of count results and generation touch, can learn whether electric capacity changes.
The present invention has reduced the requirement to the Time Created of walking line resistance and capacitance change detection module of touch-screen; And simplified circuit structure, saved chip area.
Claims (4)
1. one kind is the capacitance change detection module of detected object with the change in electric time, is used to detect the touch action that mutual capacitance touchscreens takes place, and the input end (B) of described capacitance change detection module (10) is electrically connected and forms touch-screen mutual capacitance (C
M) one of two battery lead plates, this mutual capacitance (C
M) another battery lead plate be electrically connected the sweep signal output terminal (A) of pumping signal module (20); The output terminal (E) of described capacitance change detection module (10) is electrically connected data processing module (30); It is characterized in that:
Described capacitance change detection module (10) comprises that sweep signal detects electric capacity (C
S), constant-current charge module (12), electric capacity charging control switch (13), charging detection module (14) and response time detection module (15), and be connected electrically in detection electric capacity (C
S) the charging feedback module (11) at two ends;
Described sweep signal detects electric capacity (C
S) be connected electrically between the input end (B) and constant-current charge module (12) of described capacitance change detection module (10);
Described charging feedback module (11) is used for when the step electric signal of the input end that detects described capacitance change detection module (10) (B), control described electric capacity charging control switch (13) and connect described charging detection module (14), and sweep signal is detected electric capacity (C
S) change in electric shift and to export this charging detection module (14) to, the sweep signal that described step electric signal is exported by pumping signal module (20) causes;
Described constant-current charge module (12) is used for described sweep signal is detected electric capacity (C
S) carry out constant-current charge;
Described charging detection module (14) is used to detect sweep signal and detects electric capacity (C
S) charge condition, when reaching charge threshold, the timing that outputs signal to described response time detection module (15) finishes input end (T
E);
The timing of described response time detection module (15) begins input end (T
S) be electrically connected the sweep signal output terminal (A) of pumping signal module (20), be used for described sweep signal is detected electric capacity (C
S) charging time of reaching charge threshold exports the output terminal (E) of described capacitance change detection module (10) to;
Whether described data processing module (30) compares the time data of capacitance change detection module (10) output with the time data of presetting, touched to judge mutual capacitance touchscreens.
2. according to claim 1 with the change in electric time be the capacitance change detection module of detected object, it is characterized in that:
Described electric capacity charging control switch charging control switch (13) is an insulating gate type field effect tube, or triode.
3. according to claim 1 is the capacitance change detection module of detected object with the change in electric time
Described charging feedback module (11) is first comparator/operational amplifier (OP), and described constant-current charge module (12) is current source (SC), and described electric capacity charging control switch charging control switch (13) is P-channel enhancement type insulating gate type field effect tube (M); Described charging detection module (14) is second comparator/operational amplifier (CMP);
The input end in the same way (+) of described first comparator/operational amplifier (OP) is electrically connected the input end (B) of described capacitance change detection module (10), and the reverse input end (-) of this first comparator/operational amplifier (OP) is electrically connected the first reference power source (U
Ref1), the output terminal of described first comparator/operational amplifier (OP) is electrically connected the grid (g) of described P-channel enhancement type insulating gate type field effect tube (M);
Described sweep signal detects electric capacity (C
S) end is electrically connected the input end (B) of described capacitance change detection module (10), the other end is electrically connected the drain electrode (d) of described P-channel enhancement type insulating gate type field effect tube (M), the reverse input end (-) of described second comparator/operational amplifier (CMP) and the current output terminal of described current source (SC);
The source electrode (S) of described P-channel enhancement type insulating gate type field effect tube (M) and substrate (B) are electrically connected the power supply (V of described capacitance change detection module (10)
DD);
The input end in the same way (+) of described second comparator/operational amplifier (CMP) is electrically connected the second reference power source (U
Ref2),
The timing that its output terminal is electrically connected described response time detection module (15) finishes input end (T
E).
According to claim 1 to 3 described with the change in electric time be the capacitance change detection module of detected object, it is characterized in that:
Described response time detection module (15) comprise more than one d type flip flop (DT1 ..., DTm), parallel-to-serial converter (151), latch (152) and two not gates (153,154), m is a natural number;
Begin input end (T from the timing of described response time detection module (15)
S) input signal inputs to the clear terminal (CLR) of all d type flip flops through two not gates (153,154);
The inverse output terminal of each d type flip flop (
) be electrically connected self input end (D), all d type flip flops are electrically connected by the mode serial that output terminal (Q) is electrically connected next d type flip flop clock end (CLK), the clock end of first d type flip flop (CLK) is electrically connected the clock that described capacitance change detection module (10) provides, and d type flip flop output terminal (Q) separately is electrically connected the parallel data input end of described parallel-to-serial converter (151) respectively;
Described parallel-to-serial converter (151) output data is to described latch (152); The latch instruction of this latch (152) finishes input end (T from the timing of described response time detection module (15)
E) obtain, described latch (152) output be latched the output data that data are exactly described response time detection module (15).
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| CN102564474A (en) * | 2010-12-08 | 2012-07-11 | 富士通半导体股份有限公司 | Sampling Circuity |
| CN103323675A (en) * | 2012-03-23 | 2013-09-25 | 深圳市汇春科技有限公司 | Circuit and method for capacitance touch detection |
| CN105021973A (en) * | 2015-03-11 | 2015-11-04 | 葛洲坝易普力股份有限公司 | Digital display type capacitor discharger and detection method |
| CN107422896A (en) * | 2017-04-12 | 2017-12-01 | 京东方科技集团股份有限公司 | A kind of touch display panel and its driving method, display device |
| CN110095664A (en) * | 2018-01-29 | 2019-08-06 | 无锡华润矽科微电子有限公司 | High-precision touch detection circuit and high-precision touch detecting system |
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| CN101150309A (en) * | 2007-10-31 | 2008-03-26 | 启攀微电子（上海）有限公司 | A self-adapted capacitance touch sensing control circuit |
| CN101393502A (en) * | 2008-10-31 | 2009-03-25 | 敦泰科技有限公司 | Mutual capacitance touch screen and combined mutual capacitance touch screen |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102564474A (en) * | 2010-12-08 | 2012-07-11 | 富士通半导体股份有限公司 | Sampling Circuity |
| CN102564474B (en) * | 2010-12-08 | 2015-07-22 | 株式会社索思未来 | Sampling Circuity |
| CN103323675A (en) * | 2012-03-23 | 2013-09-25 | 深圳市汇春科技有限公司 | Circuit and method for capacitance touch detection |
| CN105021973A (en) * | 2015-03-11 | 2015-11-04 | 葛洲坝易普力股份有限公司 | Digital display type capacitor discharger and detection method |
| CN105021973B (en) * | 2015-03-11 | 2019-07-30 | 葛洲坝易普力股份有限公司 | A kind of digital display type capacitance discharger and detection method |
| CN107422896A (en) * | 2017-04-12 | 2017-12-01 | 京东方科技集团股份有限公司 | A kind of touch display panel and its driving method, display device |
| CN107422896B (en) * | 2017-04-12 | 2020-07-10 | 京东方科技集团股份有限公司 | Touch display panel, driving method thereof and display device |
| US10809834B2 (en) | 2017-04-12 | 2020-10-20 | Boe Technology Group Co., Ltd. | Touch display panel, method of driving touch display panel, and display apparatus |
| CN110095664A (en) * | 2018-01-29 | 2019-08-06 | 无锡华润矽科微电子有限公司 | High-precision touch detection circuit and high-precision touch detecting system |
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