CN103970382A - Capacitive-type touch sensing device and detection method thereof - Google Patents
Capacitive-type touch sensing device and detection method thereof Download PDFInfo
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- CN103970382A CN103970382A CN201310047307.2A CN201310047307A CN103970382A CN 103970382 A CN103970382 A CN 103970382A CN 201310047307 A CN201310047307 A CN 201310047307A CN 103970382 A CN103970382 A CN 103970382A
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Abstract
A capacitive-type touch sensing device comprises a sensing unit, a driving unit, a detection circuit and a processing unit. The sensing unit comprises a first electrode and a second electrode which are used for forming a coupling capacitor, the driving unit inputs a driving signal to the sensing unit, the detection circuit is used for detecting a detection signal formed by the driving signal coupled by the coupling capacitor and utilizing two signals to respectively modulate the detection signal so as to generate a two-dimensional detection vector, and the processing unit judges a touch event according to the two-dimensional detection vector.
Description
Technical field
The invention relates to a kind of touch-control system, particularly about initiatively capacitance touching control sensing device of one.
Background technology
Capacitance type sensor (capacitive sensor) comprises the pair of electrodes in order to sensing finger conventionally.In the time that finger exists, can cause electric charge between described pair of electrodes transfer (charge transfer) amount to change, the existence that therefore can detect finger according to change in voltage whether.Multiple electrode pairs are arranged in to array and can form sensor array.
Figure 1A and Figure 1B show a kind of schematic diagram of known electric capacity sensor, and it comprises the first electrode 91, the second electrode 92, driving circuit 93 and testing circuit 94.Described driving circuit 93 is in order to extremely described the first electrode 91 of input drive signal, between described the first electrode 91 and described the second electrode 92, can produce electric field electric charge is transferred to described the second electrode 92,94 of described testing circuits can detect the charge transfer quantity of described the second electrode 92.
In the time that finger exists, for example with etc. school circuit 8 represent, described finger can be upset the electric field between described the first electrode 91 and described the second electrode 92 and reduce electric charge transfer amount, and 94 of described testing circuits can detect that magnitude of voltage changes, and so just can judge the existence of described finger whereby.
The principle of known active capacitance touching control sensor (active capacitive sensor) for example can disclose No. 2010/0096193 and United States Patent (USP) the 6th with reference to United States Patent (USP), 452, No. 514.
Shown in Fig. 1 C, the common inclusion test switch 941 of described testing circuit 94 and detecting unit 942, described detecting unit 942 can detect the magnitude of voltage on described the second electrode 92 in the open period of described detector switch 941.But, in different panels, on the signal wire of sensor array, can there are different capacitances, the relatively different sensor array of driving signal that described driving circuit 93 is inputted there will be different phase differential (phase shift).Therefore, the open period of described detector switch 941 must be proofreaied and correct for different panels, otherwise just cannot detect correct magnitude of voltage, and this aligning step has increased making complexity.
In view of this, the present invention proposes capacitance touching control sensing device and its detection method that a kind of phase differential that not produced by signal wire affects.
Summary of the invention
The object of the present invention is to provide a kind of capacitance touching control sensing device and its detection method, it utilizes the impact of two continuous signal modulation detection signals with the phase differential getting rid of sensor array signal wire and caused.
The invention provides a kind of capacitance touching control sensing device, comprise the first electrode, the second electrode, driver element, testing circuit and processing unit.Described the first electrode and described the second electrode are in order to form coupling capacitance.Described driver element drives signal to described the first electrode in order to send.Described testing circuit couples described the second electrode, is coupled to the detection signal of described the second electrode in order to detect described driving signal by described coupling capacitance, utilizes two signals detection signal produce two-dimensional detection vector described in modulation respectively.Described processing unit in order to calculate the vector norm of described two-dimensional detection vector more described vector norm with threshold value to judge the event of touching.
The present invention also provides a kind of detection method of capacitance touching control sensing device, and described capacitance touching control sensing device comprises sensing unit, and it comprises the first electrode and the second electrode in order to form coupling capacitance.Described detection method comprises: input drive signal is to described first electrode of described sensing unit; Drive described in modulation respectively signal is coupled to described the second electrode detection signal by described coupling capacitance to produce detection signal after a pair of modulation with two signals; And calculate the size (scale) of detection signal after described a pair of modulation and accordingly judgement touch event.
The present invention also provides a kind of capacitance touching control sensing device, comprises capacitance sensing array, multiple driver element, testing circuit and processing unit.Multiple sensing units that described capacitance sensing array comprises arrayed, each sensing unit comprises the first electrode and the second electrode in order to form coupling capacitance.Described driver element couples the first electrode of described sensing unit, in order to output drive signal successively to described the first electrode.Described testing circuit couples the second electrode of described sensing unit, be coupled to the detection signal of described the second electrode by described coupling capacitance in order to detect successively described driving signal, utilize two signals respectively described in modulation detection signal to produce detection signal after a pair of modulation.Described processing unit touches event and touch location according to detection signal judgement after described a pair of modulation.
In one embodiment, described vector norm (norm of vector) can utilize rotation of coordinate digital computer (CORDIC) to try to achieve.
In one embodiment, described two signals are continuous signal, for example, can be orthogonal or non-orthogonal two continuous signals.For example, described two signals can be sinusoidal signal and cosine signal, and phase differential therebetween can equal, be greater than or less than zero degree.
In one embodiment, described driving signal can be time varying signal, for example periodic signal.
In one embodiment, described testing circuit also comprises at least one integrator and at least one analog/digital converting unit.Described integrator passes through the described detection signal of modulation in order to integration.Described analog/digital converting unit in order to digitisation the described detection signal by modulation and integration to produce two components of described two-dimensional detection vector.
In the capacitance touching control sensing device of the embodiment of the present invention, when object is during near described sensing unit, described vector norm may become large or diminish.Therefore, by more described vector norm and threshold value, can judge whether described object exists near described sensing unit, and because described vector norm is only scale, judge degree of accuracy therefore can get rid of the impact that the phase shift (phase shift) of signal wire in sensor array causes to increase.
Brief description of the drawings
Figure 1A-1C shows the block schematic diagram of known active capacitance touching control sensor;
Fig. 2 shows the schematic diagram of the capacitance touching control sensing device of the embodiment of the present invention;
Fig. 3 A-3B shows another schematic diagram of the capacitance touching control sensing device of the embodiment of the present invention;
Fig. 4 shows in the capacitance touching control sensing device of the embodiment of the present invention, the schematic diagram of vector norm and threshold value;
Fig. 5 shows the schematic diagram of the capacitance touching control sensing device of another embodiment of the present invention;
Fig. 6 shows the operation workflow figure of the capacitance touching control sensing device of Fig. 5.
Description of reference numerals
10 sensing unit 101,91 first electrodes
102,92 second electrode 103 coupling capacitances
11 time schedule controllers 12,12
1-12
ndriver element
13,94 testing circuits 131,131 ' multiplier
132,132 ' integrator 133,133 ' analog/digital converting unit
14 processing unit 93 driving circuits
941 detector switch 942 detecting units
8 finger x(t) driving signal
Y(t) detection signal y
1(t), y
2(t) detection signal after modulation
SW
1-sWm on-off element S
1, S
2continuous signal
S
31-S
34step I, Q detect vectorial component.
Embodiment
In order to allow above and other object of the present invention, feature and the advantage can be more obvious, below will coordinate appended diagram, be described in detail below.In explanation of the present invention, identical member is to represent with identical symbol, illustrates in advance at this.
Please refer to shown in Fig. 2, it shows the schematic diagram of the capacitance touching control sensing device of the embodiment of the present invention.The capacitance touching control sensing device of the present embodiment comprises sensing unit 10, driver element 12, testing circuit 13 and processing unit 14.Described capacitance touching control sensing device is that the charge variation by judging described sensing unit 10 detects object (such as, but not limited to, finger or sheet metal) and whether approaches described sensing unit 10.
Described sensing unit 10 comprises such as drive electrode of the first electrode 101() and such as receiving electrode of the second electrode 102(), in the time that voltage signal inputs to described the first electrode 101, between described the first electrode 101 and described the second electrode 102, can produce electric field and form coupling capacitance 103.Described the first electrode 101 can suitably configure with described the second electrode 102 and there is no specific limited, for example, as long as can form described coupling capacitance 103 (passing through dielectric layer); Wherein, the principle that produces electric field and coupling capacitance 103 between described the first electrode 101 and described the second electrode 102 has been known, therefore do not repeat in this.Spirit of the present invention is the impact on testing result of phase differential that on erasure signal line, electric capacity causes.
Described driver element 12 is for example signal generation unit, and it can send and drive signal x(t) to the first electrode 101 of described sensing unit 10.Described driving signal x(t) can be time varying signal, for example periodic signal.In other embodiment, described driving signal x(t) also can be pulse signal, such as square wave, triangular wave etc., but not as limit.Described driving signal x(t) by the described coupling capacitance 103 detection signal y(t that can be coupled) to the second electrode 102 of described sensing unit 10.
Described testing circuit 13 couples the second electrode 102 of described sensing unit 10, in order to detect described detection signal y(t), and utilize respectively detection signal y(t described in modulations of two signals) and produce a pair of modulation after detection signal using two component I, Q as two-dimensional detection vector; Wherein, described two signals can be continuous signal, for example orthogonal or non-orthogonal continuous signal or two vectors.In one embodiment, described two signals are sinusoidal signal and cosine signal; Wherein, the phase differential of described sinusoidal signal and cosine signal can be zero also can be non-vanishing.
Described processing unit 14 in order to the size (scale) of calculating detection signal after described a pair of modulation using as described two-dimensional detection vector (I, Q) vector norm (norm of vector), and more described vector norm and threshold value TH touch event (touch event) with judgement.In one embodiment, described processing unit 14 can utilize the mode of software to calculate described vector norm
in another embodiment, described processing unit 14 also can utilize the mode of hardware or firmware to calculate, for example adopt the rotation of coordinate digital computer shown in Fig. 4 (CORDIC, coordinate rotation digital computer) to calculate described vector norm
wherein, CORDIC is a kind of known rapid algorithm.For example, when without any described in object proximity when sensing unit 10, suppose that the described vector norm that described processing unit 14 calculates is R; When described in object proximity when sensing unit 10, described vector norm is reduced to R '; In the time that described vector norm R ' is less than described threshold value TH, 14 of described processing units can judge that object is positioned near described sensing unit 10 and causes the event of touching.Should be noted that, when other objects, for example sheet metal, while approaching described sensing unit 10, also likely causes described vector norm R to increase, and therefore described processing unit 14 also can be changed to and be judged to be the event of touching while being greater than predetermined threshold value at described vector norm.
In another embodiment, described processing unit 14 can utilize orthogonal amplitude Shift Keying (QASK) to encode two component I of two-dimensional detection vector and Q, for example 16-QASK.In described processing unit 14, the part coding in QASK coding is corresponded to the event of touching and another part coding corresponds to and do not touch in advance.In the time that described processing unit 14 calculates the QASK coding of current two component I and Q according to detection signal after modulation, can judge whether object approaches described sensing unit 10.
Fig. 3 A and 3B show another schematic diagram of the capacitance touching control sensing device of the embodiment of the present invention, and it demonstrates the embodiment of described testing circuit 13.
In Fig. 3 A, described testing circuit 13 comprise two multipliers 131 and 131 ', two integrators 132 and 132 ', two analog/digital converting units (ADC) 133 and 133 ', in order to process described detection signal y(t) to produce two-dimensional detection vector (I, Q).Described two multipliers 131 and 131 ' in order to respectively by two signals, for example, are now shown as
and
with described detection signal y(t) carry out modulation to produce detection signal y after a pair of modulation
1and y (t)
2(t).In order to sample detection signal y after described a pair of modulation
1and y (t)
2(t), utilize described two integrators 132 and 132 ' to detection signal y after described a pair of modulation
1and y (t)
2(t) carry out integration; In the present embodiment, described two integrators 132 and 132 ' form there is no specific limited, for example can be capacitor (capacitor).Described two analog/digital converting units 133 and 133 ' in order to digitisation detection signal y after the described a pair of modulation of integration
1and y (t)
2(t) to produce two numerical digit component I, the Q of described two-dimensional detection vector.Scrutable, described two analog/digital converting units 133 and 133 ' described two integrators 132 and 132 ' potential change start to obtain digital date while stablizing.Described two signals, except using two above-mentioned continuous signals, also can be two vectors, for example S
1=[10-10] and S
2=[0-101] is to simplify circuit framework.Described two signals as long as the suitable simplification vector that can simplify modulation and conciliate modulation process all can, there is no specific limited.
In Fig. 3 B, described testing circuit 13 comprises multiplier 131, integrator 132 and analog/digital converting unit 133, and two signal S
1and S
2through multiplexer 130 input described multiplier 131 with described detection signal y(t) carry out modulation and produce detection signal y after two modulations
1and y (t)
2(t).In addition, the function of described multiplier 131, described integrator 132 and described analog/digital converting unit 133 is identical with Fig. 3 A, therefore repeat no more in this.
In sum, the detection method of the capacitance touching control sensing device of the embodiment of the present invention comprises the following step: input drive signal is to the first electrode of sensing unit; Drive described in modulation respectively signal is coupled to the second electrode detection signal by coupling capacitance to produce detection signal after a pair of modulation with two signals; And calculate the size of detection signal after described a pair of modulation and event is touched in judgement according to this.
For example, with reference to shown in Fig. 3 A and 3B, described driver element 12 input drive signal x(t) to after the first electrode 101 of described sensing unit 10, described driving signal x(t) by the described coupling capacitance 103 detection signal y(t that is coupled) to the second electrode 102 of described sensing unit 10.Then, described testing circuit 13 is with two signal S
1and S
2respectively detection signal y(t described in modulation) to produce detection signal y after a pair of modulation
1and y (t)
2(t).Described processing unit 14 calculates detection signal y after described a pair of modulation
1and y (t)
2(t) event is touched in size accordingly judgement; Wherein, calculate detection signal y after described a pair of modulation
1and y (t)
2(t) big or small mode for example can be with reference to Fig. 4 and its related description.In addition, calculating detection signal y after described a pair of modulation
1and y (t)
2(t), before size, can utilize described in described integrator 132 and/or 132 ' integration detection signal y after a pair of modulation
1and y (t)
2(t) after, by described analog/digital converting unit 133 and/or 133 ' carry out digitisation to export two numerical digit component I, the Q of described two-dimensional detection vector (I, Q).
Please refer to shown in Fig. 5, it shows the schematic diagram of the capacitance touching control sensing device of another embodiment of the present invention.Multiple sensing units 10 of arrayed can form capacitance sensing array, and each row sensing unit 10 is by driver element 12
1-12
ndriving and described testing circuit 13 are by multiple on-off element SW
1-sW
mdetect the output signal of every a line sensing unit 10.As shown in Figure 5, driver element 12
1in order to drive first row sensing unit 10
11-10
1m; Driver element 12
2in order to drive secondary series sensing unit 10
21-10
2m; Driver element 12
nin order to drive n row sensing unit 10
n1-10
nm; Wherein, n and m are that positive integer and its numerical value can determine according to the size of capacitance sensing array and resolution, there is no specific limited.
In the present embodiment, this sentences each sensing unit 10(circle and represents) all comprise the first electrode and the second electrode in order to form coupling capacitance, as shown in Fig. 2,3A and 3B.Described driver element 12
1-12
nbe coupled to respectively the first electrode of a row sensing unit 10.11 of time schedule controllers are in order to control described driver element 12
1-12
noutput drive signal x(t successively) to the first electrode of described sensing unit 10.
Described testing circuit 13 is by multiple on-off element SW
1-sW
mcouple respectively the second electrode of a line sensing unit 10, in order to detect successively described driving signal x(t) be coupled to the detection signal y(t of described the second electrode by the coupling capacitance of described sensing unit 10), and utilize two signals detection signal y(t described in modulations respectively) to produce detection signal after a pair of modulation; Wherein, the mode of detection signal after described a pair of modulation that produces has been specified in Fig. 3 A and 3B and its related description, therefore do not repeat in this.
14 of described processing units touch event and touch location according to detection signal judgement after described a pair of modulation.As previously mentioned, described processing unit 14 can calculate the vector norm of the two-dimensional detection vector that detection signal forms after described a pair of modulation, touches event, as shown in Figure 4 in the time that described vector norm is less than or equal to or is more than or equal to threshold value TH described in judging.
In the present embodiment, when described time schedule controller 11 is controlled described driver element 12
1export described driving signal x(t) to first row sensing unit 10
11-10
1mtime, described on-off element SW
1-sW
mdescribed testing circuit 13 is unlocked successively so that can detect first row sensing unit 10 successively
11-10
1mthe detection signal y(t that exports of each sensing unit).Then, described time schedule controller 11 is controlled other driver elements 12 successively
2-12
nexport described driving signal x(t) to each row sensing unit.When described testing circuit 13 detected after all sensing units, complete a scan period (scan period).14 of described processing units are described touch location by the location determination that touches the sensing unit of event described in generation in the scan period.Scrutablely be, described touch location may not only betide a sensing unit 10, described processing unit 14 can all be regarded the position of multiple sensing units 10 as touch location, or regards the position of multiple sensing units 10 one of them (for example center or centers of gravity) as touch location.
Shown in Fig. 6, the operation workflow figure that it shows the capacitance touching control sensing device of the embodiment of the present invention, comprises the following step: input drive signal is to sensing unit (the step S of capacitance sensing array
31); With two signals respectively described in modulation the detection signal of sensing unit output to produce detection signal (step S after a pair of modulation
32); Detection signal (step S after a pair of modulation described in integration digitisation
33); And event and touch location (step S are touched in judgement
34).The function mode of the present embodiment has been specified in Fig. 5 and its related description, therefore repeat no more in this.
In another embodiment, in order to save the power consumption of capacitance touching control sensing device in Fig. 5, described time schedule controller 11 can be controlled multiple driver elements 12
1-12
nexport described driving signal x(t simultaneously) to the sensing unit of corresponding row.13 of described testing circuits are with two different continuous signal S
1, S
2each row detection signal y(t of modulation respectively) to distinguish.In addition, similar Fig. 5 of mode of event and touch location is touched in judgement, therefore repeat no more in this.
In the embodiment of the present invention, described testing circuit 13 can also comprise the element such as wave filter and/or amplifier, to increase signal quality.In addition, described processing unit 14 also can be merged into single element with described testing circuit 13.
In sum, known active capacitance touching control sensor must carry out adjustment with correct detectable voltage signals for different contact panels, thereby has higher making complexity.The present invention also proposes a kind of capacitance touching control sensing device (Fig. 2,3A and 3B) and its detection method (Fig. 6), its utilize two continuous signals respectively modulation detection signal the vector norm according to detection signal after modulation judge the event of touching (Fig. 4), get rid of whereby the impact of the phase differential that sensor array signal wire causes and simplify processing procedure.
Although the present invention is disclosed by previous embodiment, it is not in order to limit the present invention, any technician in the technical field of the invention with common knowledge, without departing from the spirit and scope of the present invention, when doing various changes and amendment.Therefore the scope that protection scope of the present invention ought define depending on accompanying claim is as the criterion.
Claims (20)
1. a capacitance touching control sensing device, this capacitance touching control sensing device comprises:
The first electrode and the second electrode, in order to form coupling capacitance;
Driver element, drives signal to described the first electrode in order to send;
Testing circuit, couples described the second electrode, is coupled to the detection signal of described the second electrode in order to detect described driving signal by described coupling capacitance, utilizes two signals detection signal produce two-dimensional detection vector described in modulation respectively; And
Processing unit, in order to calculate the vector norm of described two-dimensional detection vector and this vector norm and threshold value compared to judge the event of touching.
2. capacitance touching control sensing device according to claim 1, wherein said two signals are orthogonal continuous signal.
3. capacitance touching control sensing device according to claim 1, wherein said two signals are sinusoidal signal and cosine signal.
4. capacitance touching control sensing device according to claim 1, wherein said processing unit utilizes rotation of coordinate digital computer to calculate described vector norm.
5. capacitance touching control sensing device according to claim 1, wherein said driving signal is periodic signal.
6. capacitance touching control sensing device according to claim 1, wherein said testing circuit also comprises at least one integrator and at least one analog/digital converting unit, and described integrator is the described detection signal through modulation in order to integration; The described detection signal that described analog/digital converting unit is passed through modulation and integration in order to digitisation is to produce two components of described two-dimensional detection vector.
7. a detection method for capacitance touching control sensing device, described capacitance touching control sensing device comprises sensing unit, and this sensing unit comprises to form the first electrode and second electrode of coupling capacitance, and described detection method comprises:
Input drive signal is to described first electrode of described sensing unit;
Drive described in modulation respectively signal is coupled to described the second electrode detection signal by described coupling capacitance to produce detection signal after a pair of modulation with two signals; And
Calculate the size of detection signal after described a pair of modulation and accordingly judgement touch event.
8. detection method according to claim 7, after wherein said a pair of modulation the size of detection signal for described a pair of modulation after the vector norm of the bivector that forms of detection signal.
9. detection method according to claim 8, wherein said vector norm is to utilize rotation of coordinate digital computer to try to achieve.
10. detection method according to claim 7, wherein said two signals are sinusoidal signal and cosine signal.
11. detection methods according to claim 7, wherein said two signals are orthogonal continuous signal.
12. detection methods according to claim 7, wherein said driving signal is periodic signal.
13. detection methods according to claim 7 wherein also comprised before the size of calculating detection signal after described a pair of modulation:
Detection signal after a pair of modulation described in integration digitisation.
14. 1 kinds of capacitance touching control sensing devices, this capacitance touching control sensing device comprises:
Capacitance sensing array, the multiple sensing units that comprise arrayed, each sensing unit comprises to form the first electrode and second electrode of coupling capacitance;
Multiple driver elements, couple the first electrode of described sensing unit, in order to output drive signal successively to described the first electrode;
Testing circuit, couple the second electrode of described sensing unit, be coupled to the detection signal of described the second electrode by described coupling capacitance in order to detect successively described driving signal, utilize two signals respectively described in modulation detection signal to produce detection signal after a pair of modulation; And
Processing unit, touches event and touch location according to detection signal judgement after described a pair of modulation.
15. capacitance touching control sensing devices according to claim 14, wherein said two signals are orthogonal continuous signal.
16. capacitance touching control sensing devices according to claim 14, wherein said two signals are sinusoidal signal and cosine signal.
17. capacitance touching control sensing devices according to claim 14, wherein said driving signal is periodic signal.
18. capacitance touching control sensing devices according to claim 14, the vector norm of the two-dimensional detection vector that after the described a pair of modulation of wherein said processing unit calculating, detection signal forms, described in judging in the time that described vector norm is less than or greater than threshold value, the event of touching occurs.
19. capacitance touching control sensing devices according to claim 18, wherein said processing unit utilizes rotation of coordinate digital computer to calculate described vector norm.
20. capacitance touching control sensing devices according to claim 14, wherein said processing unit is described touch location by touching the location determination of sensing unit described at least one of event described in occurring in the scan period.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106201129A (en) * | 2014-12-10 | 2016-12-07 | 原相科技股份有限公司 | Capacitance touch-control device, capacitive communication device and communication system |
| CN110567494A (en) * | 2018-06-06 | 2019-12-13 | 苹果公司 | Capacitive position sensing for capacitively driven MEMS devices |
-
2013
- 2013-02-06 CN CN201310047307.2A patent/CN103970382A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106201129A (en) * | 2014-12-10 | 2016-12-07 | 原相科技股份有限公司 | Capacitance touch-control device, capacitive communication device and communication system |
| CN106201129B (en) * | 2014-12-10 | 2019-04-05 | 原相科技股份有限公司 | Capacitive communication device and communication system |
| CN110032301A (en) * | 2014-12-10 | 2019-07-19 | 原相科技股份有限公司 | Capacitance touch-control device |
| CN110032301B (en) * | 2014-12-10 | 2022-10-25 | 原相科技股份有限公司 | Capacitive touch device |
| CN110567494A (en) * | 2018-06-06 | 2019-12-13 | 苹果公司 | Capacitive position sensing for capacitively driven MEMS devices |
| CN110567494B (en) * | 2018-06-06 | 2021-12-07 | 苹果公司 | Capacitive position sensing for capacitively driven MEMS devices |
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