CN102156562B - Object sensing device, touch sensing system and touch sensing method - Google Patents
Object sensing device, touch sensing system and touch sensing method Download PDFInfo
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Abstract
An object sensing device comprises an object sensing unit, a signal selection unit, at least one signal sensing unit and a control unit. The object sensing unit is used for outputting a plurality of sensing signals. The signal selection unit is used for selecting at least one of the sensing signals as a signal to be tested and selecting at least one of the unselected sensing signals as a reference signal. The signal sensing unit is used for outputting a difference signal according to the signal to be detected and the reference signal. The control unit is used for judging at least one object position relative to the object sensing unit according to the difference signal. In addition, a touch sensing device and a method thereof are also provided.
Description
Technical field
The present invention relates to a kind of sensing apparatus and method thereof, and be particularly related to a kind of object (object) sensing apparatus and method thereof.
Background technology
In the information age now, human dependence for electronic product grows with each passing day.Mobile computer, mobile phone, personal digital aid (PDA) (personal digital assistant, PDA), electronic product such as digital walkman all become indispensable application tool in modern's life and the work.Above-mentioned electronic product all has an input interface, must instruct in order to import user institute, so that the built-in system of electronic product automatically performs this instruction.Present most popular input interface unit comprises keyboard (keyboard) and mouse (mouse).
For the user, use traditional input interface such as keyboard, mouse can cause sizable inconvenience undoubtedly in the occasion of part.In order to solve such problem, it for example is the touch-control input interface of Trackpad (touch pad) or contact panel (touch panel) etc. that manufacturer just begins to dispose one on the electronic installation, and then replaces keyboard or mouse function by Trackpad or contact panel.With regard to the touch-control input interface, at present the user utilizes contacting of producing between finger or pointer and the touch-control input interface or the induction behavior clicks action.With the capacitance touching control input interface, but the characteristic of multi-point touch provides more humane operator scheme and make capacitance type touch-control panel be subjected to the favor in market gradually.
But, in the capacitance touching control input interface, if use the monofocal sensing circuit before the induction that measures testing capacitance changes, all must measure and store the capacitance of testing capacitance earlier, with as substrate (baseline).Afterwards, the testing capacitance value that actual amount is measured deducts substrate again, changes with the induction that obtains testing capacitance.Simultaneously, the measurement reference value of the testing capacitance of monofocal sensing circuit makes it can't effectively offset the noise that comes from the outside for fixing, and then makes that (Noise-to-Signal Ratio NSR) can't effectively promote for the jam-to-signal of monofocal sensing circuit.
Summary of the invention
The invention provides a kind of object sensing apparatus, it is adjustment amount survey reference value dynamically, effectively promotes its jam-to-signal.
The invention provides a kind of touch-control sensing system, its dynamically adjustment amount survey reference value, effectively promote its jam-to-signal.
The invention provides a kind of sensing method of touch control, it is adjustment amount survey reference value dynamically, effectively the jam-to-signal of promotion feeling examining system.
The invention provides a kind of object sensing apparatus, it comprises an object sensing cell, a signal selected cell, at least one signal sensing unit and a control module.The object sensing cell is in order to export a plurality of sensing signals.The signal selected cell is in order to selecting at least one of them as a measured signal from sensing signal, and selects at least one of them as a reference signal from non-selected sensing signal.A difference signal is exported in order to foundation measured signal and reference signal in the signal sensing unit.Control module is judged the object position with respect to the object sensing cell in order to the foundation difference signal.
In one embodiment of this invention, above-mentioned control module comprises an analog-digital converter and a controller.Analog-digital converter is a digital signal in order to change difference signal.Controller is judged the object's position with respect to the object sensing cell in order to the foundation digital signal.
In one embodiment of this invention, above-mentioned signal selected cell respectively at one first sensing during and during one second sensing in, from non-selected sensing signal, select sensing signals different more than at least two as the reference signal.
In one embodiment of this invention, above-mentioned sensing signal has P.The signal selected cell selects N sensing signal as measured signal, and selects (N+K) individual sensing signal and (N-K) individual sensing signal as the reference signal, and wherein P, N and K respectively are a positive integer, 1＜N＜P, and 3≤K+N≤P, 1≤K-N≤(P-2).
In one embodiment of this invention, above-mentioned signal selected cell is selected two or more as measured signal at least from sensing signal, and from non-selected sensing signal, select two or more at least conducts with reference to signal, and each signal sensing unit receives corresponding measured signal and corresponding reference signal, to export corresponding difference signal.
In one embodiment of this invention, each signal sensing unit receives corresponding measured signal and other signal sensing unit to receive other corresponding measured signal different.
In one embodiment of this invention, each signal sensing unit is identical in receiving corresponding measured signal during one first sensing and during one second sensing.
In one embodiment of this invention, each signal sensing unit reference signal difference that receives during reaching second sensing during first sensing.
In one embodiment of this invention, above-mentioned control module receives a plurality of difference signals, and according to the object's position of a plurality of difference signals judgements that receive with respect to the object sensing cell.
In one embodiment of this invention, above-mentioned control module comprises a plurality of analog-digital converters and a controller.Each analog-digital converter is in order to receiving corresponding difference signal, and is converted to a corresponding digital signal.Controller is in order to receiving a plurality of digital signals, and judges object's position with respect to the object sensing cell according to a plurality of digital signals that receive.
In one embodiment of this invention, above-mentioned object sensing apparatus also comprises a driver element, and it is in order to driven object sensing cell output sensing signal.
The invention provides a kind of touch-control sensing system, it comprises a touch-control input interface, a signal selected cell, at least one signal sensing unit and a control module.The touch-control input interface comprises a plurality of touch sensings, in order to export a plurality of sensing signals according to a touch action.The signal selected cell is in order to selecting at least one of them as a measured signal from sensing signal, and selects at least one of them as a reference signal from non-selected sensing signal.A difference signal is exported in order to foundation measured signal and reference signal in the signal sensing unit.Control module judges that in order to the foundation difference signal touch action occurs in the position of touch-control input interface.
In one embodiment of this invention, above-mentioned control module comprises an analog-digital converter and a controller.Analog-digital converter is a digital signal in order to change difference signal.Controller judges that in order to the foundation digital signal touch action occurs in the position of touch-control input interface.
In one embodiment of this invention, above-mentioned signal selected cell respectively at one first sensing during and during one second sensing in, from non-selected sensing signal, select sensing signals different more than at least two as the reference signal.
In one embodiment of this invention, above-mentioned sensing signal has P.The signal selected cell selects N sensing signal as measured signal, and selects (N+K) individual sensing signal and (N-K) individual sensing signal as the reference signal, and wherein P, N and K respectively are a positive integer, 1＜N＜P, and 3≤K+N≤P, 1≤K-N≤(P-2).
In one embodiment of this invention, above-mentioned signal selected cell is selected two or more as measured signal at least from sensing signal, and from non-selected sensing signal, select two or more at least conducts with reference to signal, and each signal sensing unit receives corresponding measured signal and corresponding reference signal, to export corresponding difference signal.
In one embodiment of this invention, each signal sensing unit receives corresponding measured signal and other signal sensing unit to receive other corresponding measured signal different.
In one embodiment of this invention, each signal sensing unit is identical in receiving corresponding measured signal during one first sensing and during one second sensing.
In one embodiment of this invention, each signal sensing unit reference signal difference that receives during reaching second sensing during first sensing.
In one embodiment of this invention, above-mentioned control module receives a plurality of difference signals, and judges that according to a plurality of difference signals that receive touch action occurs in the position of touch-control input interface.
In one embodiment of this invention, above-mentioned control module comprises a plurality of analog-digital converters and a controller.Each analog-digital converter is in order to receiving corresponding difference signal, and is converted to a corresponding digital signal.Controller is in order to receiving a plurality of digital signals, and judges that according to a plurality of digital signals that receive touch action occur in the position of touch-control input interface.
In one embodiment of this invention, above-mentioned touch-control sensing system also comprises a driver element, and it is in order to drive touch sensing output sensing signal.
The invention provides a kind of sensing method of touch control, it is applicable to a kind of touch-control sensing system, and wherein the touch-control sensing system comprises a touch-control input interface.Sensing method of touch control comprises the steps.Produce a plurality of sensing signals according to a touch action.From a plurality of sensing signals, select at least one of them as a measured signal.From non-selected sensing signal, select at least one of them as a reference signal.Produce a difference signal according to measured signal and reference signal.Judge that according to difference signal touch action occurs in the position of touch-control input interface.
In one embodiment of this invention, above-mentioned sensing method of touch control also comprises the steps.The conversion difference signal is a digital signal.Judge that according to digital signal touch action occurs in the position of touch-control input interface.
In one embodiment of this invention, in the step of selecting reference signal, respectively at during one first sensing and in during one second sensing, from non-selected sensing signal, select sensing signals different more than at least two as the reference signal.
In one embodiment of this invention, above-mentioned sensing signal has P sensing signal, and in the step of selecting measured signal, selecting N sensing signal is measured signal.In the step of selecting reference signal, select (N+K) individual sensing signal and (N-K) individual sensing signal as the reference signal, wherein P, N and K respectively are a positive integer, 1＜N＜P, 3≤K+N≤P, 1≤K-N≤(P-2).
In one embodiment of this invention, above-mentioned touch-control sensing system also comprises a plurality of signal sensings unit.In the step of selecting measured signal, select two or more at least sensing signals as measured signal.In the step of selecting reference signal, from non-selected sensing signal, select two or more at least conducts with reference to signal.Produce in the step of difference signal at foundation measured signal and reference signal, receive corresponding measured signal and corresponding reference signal by each signal sensing unit, to export corresponding difference signal.
In one embodiment of this invention, each signal sensing unit receives corresponding measured signal and other signal sensing unit to receive other corresponding measured signal different.
In one embodiment of this invention, each signal sensing unit is identical in receiving corresponding measured signal during one first sensing and during one second sensing.
In one embodiment of this invention, each signal sensing unit reference signal difference that receives during reaching second sensing during first sensing.
In one embodiment of this invention, judging that touch action occurs in the step of position of touch-control input interface, judges that according to a plurality of difference signals touch action occur in the position of touch-control input interface.
In one embodiment of this invention, above-mentioned sensing method of touch control comprises that also producing one drives signal, to drive touch sensing after receiving the driving signal, the output sensing signal.
Based on above-mentioned, in an embodiment of the present invention, the signal selected cell selects at least one reference signal as the measurement reference value of measured signal from a plurality of sensing signals, can effectively offset the noise that comes from the outside, and then promote its jam-to-signal.In addition, during different sensings in, the signal selected cell is selected different reference signals, to reach the purpose that dynamic adjustment measures reference value.
For above-mentioned feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and cooperate appended graphic being described in detail below.
Description of drawings
Fig. 1 is the block schematic diagram of the touch-control sensing system of one embodiment of the invention.
Fig. 2 is the circuit diagram of the touch-control input interface of Fig. 1.
Fig. 3 is the block schematic diagram of the touch-control sensing system of another embodiment of the present invention.
Fig. 4 is the block schematic diagram of the touch-control sensing system of another embodiment of the present invention.
Fig. 5 illustrates the signal selected cell and selects different sensing signals to be sent to corresponding signal sensing unit as the reference signal during different sensings.
Fig. 6 illustrates the signal selected cell and selects different sensing signals to be sent to corresponding signal sensing unit as the reference signal during different sensings.
Fig. 7 is the flow chart of steps of the sensing method of touch control of one embodiment of the invention.
[primary clustering symbol description]
100,300,400: the touch-control sensing system
110,310,410: capacitance sensing apparatus
112,312,412: the signal selected cell
114,314,414 (1)～414 (k): signal sensing unit
120,320,420: the touch-control input interface
122: drive wire
124: sense wire
130,330,430: control module
132,332,432 (1)～432 (k): analog-digital converter
134,334,434: controller
S700, S702, S704,706: step
Y
1-Y
p: sensing signal
X
1-X
q: drive signal
S
1-S
k: measured signal
R
1-R
k: reference signal
T
1-T
k: during the sensing
C (1)-C (p): sense capacitance
Δ C: capacitance variations
Embodiment
In the capacitance touching control input interface, whether the capacitance of sense capacitance is touched and determine corresponding to the position on the touch-control input interface according to sense capacitance.When sense capacitance was touched corresponding to the position on the touch-control input interface, the touching object can produce the capacitance variations of a correspondence, and forms a testing capacitance with sense capacitance.
In an embodiment of the present invention, except testing capacitance, the capacitance of other sense capacitance can be used as the reference value when measuring testing capacitance.Therefore, after comparing testing capacitance value and reference capacitance value, just can determine to touch object corresponding to the touch position of touch-control input interface.
In the following embodiments, will have in any affiliated technical field and know that usually the knowledgeable is when knowing that contact panel is not in order to limit touch-control input interface of the present invention with the exemplary embodiment of contact panel as the touch-control input interface.Simultaneously, the present invention also is not limited to the input interface of touch, and any input interface in the capacitance sensing mode is all the category of institute of the present invention desire protection such as.
Fig. 1 is the block schematic diagram of the touch-control sensing system of one embodiment of the invention.Please refer to Fig. 1, in the present embodiment, touch-control sensing system 100 comprises a capacitance sensing apparatus 110, a touch-control input interface 120 and a control module 130, wherein touch-control input interface 120 for example is the contact panel of display or the Trackpad of other tool touch-control sensing function, it comprises a plurality of sense capacitance, in order to export a plurality of sensing signal Y
1-Y
p
Fig. 2 is the circuit diagram of the touch-control input interface 120 of Fig. 1.Please be simultaneously with reference to Fig. 1 and Fig. 2, in the present embodiment, whether the capacitance of sense capacitance is touched and determine corresponding to the position on the touch-control input interface according to sense capacitance.Be example with sense capacitance C (n), when sense capacitance C (n) was touched corresponding to the position on the touch-control input interface, the touching object can produce the capacitance variations Δ C of a correspondence.At this moment, sense capacitance C (n) and capacitance variations Δ C form testing capacitance C (n)+Δ C, and by corresponding sense wire 124 outputs one measured signal Y
nThen, the capacitance of testing capacitance C (n)+Δ C can be learnt its variation by capacitance sensing apparatus 110 sensings.Afterwards, control module 130 can determine testing capacitance corresponding to the touch position on the touch-control input interface according to this once changing.That is to say that control module 130 changes to judge that according to this touch action occurs in the position of object sensing cell 120.
It should be noted that in the present embodiment except testing capacitance C (n)+Δ C, the capacitance of other sense capacitance can be used as the reference signal when measuring testing capacitance, the noise that comes from the outside with effective payment, and then promote its jam-to-signal.
Specifically, be example with the touch-control sensing system of mutual capacitance type, during operation, the testing capacitance on the touch-control input interface 120 can receive the driving signal X from a driver element (not illustrating) by the drive wire of correspondence
1-X
q, and then at the online generation sensing signal of the sensing of correspondence Y
1-Y
pWherein, p, q respectively are a positive integer, and 1＜p, 1＜q.For example, when being driven, put on the driving signal X on the drive wire 122
mCan be coupled to and its sense wire that intersects 124 by sense capacitance C (n), and then produce sensing signal Y at sense wire 124
nWherein, n, m respectively are a positive integer, and 1≤n≤p, 1≤m≤q.
Therefore, during operation, drive signal X by applying
m On drive wire 122, capacitance sensing apparatus 110 can obtain the funtcional relationship of the distribution of capacitance values of sense capacitance C (1)-C (p).
So when touching object (for example be finger or pointer) approaches or touch sensing capacitor C (n) during corresponding to the position on the touch-control input interface 120, it can produce corresponding capacitance variations Δ C, and then changes this funtcional relationship.Afterwards, touch-control sensing system 100 just can determine testing capacitance C (n)+Δ C corresponding to the touch position on the touch-control input interface 120 by capacitance sensing apparatus 110 and control module 130.
Please continue with reference to Fig. 1, in the present embodiment, capacitance sensing apparatus 110 comprises a signal selected cell 112 and a signal sensing unit 114.Control module 130 comprises an analog-digital converter 132 and a controller 134.
Signal selected cell 112 is in order to receive sensing signal Y
1-Y
p, and from sensing signal Y
1-Y
pMiddle at least one measured signal and at least one reference signal selected.Afterwards, signal selected cell 112 is sent to selected measured signal and reference signal signal sensing unit 114 again and carries out a difference relatively.
For example, during one first sensing in, signal selected cell 112 is selected sensing signal Y
n, Y
N+kBe sent to signal sensing unit 114 and carry out difference relatively.At this, k is a positive integer, and 1≤n≤(p-1), 2≤(n+k)≤p.Be example with k=1, signal selected cell 112 is selected and sensing signal Y
nAdjacent sensing signal Y
N+1Reference signal when measuring testing capacitance, and export it to signal sensing unit 114 and sensing signal Y
nCarry out difference relatively.Then, signal sensing unit 114 finish difference relatively after, produce a difference signal, and export control module 130 to.That is to say that control module 130 judges that in order to the foundation difference signal touch action occurs in the position of object sensing cell 120.
Therefore, in the present embodiment, except measured signal Y
nIn addition, signal selected cell 112 is selected sensing signal Y from non-selected sensing signal
N+kReference signal during as the measurement testing capacitance can effectively be offseted from the noise on the touch-control input interface 120, and then promote its jam-to-signal.
That is to say, can be considered common-mode noise (commonmode noise) from the noise on the touch-control input interface 120, therefore by the reference signal of from non-selected sensing signal, selecting at least one sensing signal when measuring testing capacitance, can suppress the common-mode noise in the sensing circuit, to improve the jam-to-signal of sensing system.
It should be noted that present embodiment is to select sensing signal Y with signal selected cell 112
n, Y
N+kBe example, but the present invention is not limited to this.In other embodiments, signal selected cell 112 can be selected arbitrary sensing signal Y from non-selected sensing signal
m(not illustrating) reference signal when measuring testing capacitance, with effective payment from the noise on the touch- control input interface 120,1≤m≤p wherein.
Be with, during first sensing in, when sense capacitance C (n) because of touched when producing capacitance variations Δ C, but the difference signal that control module 130 basis signal sensing cells 114 produce calculates corresponding to the position on the touch-control input interface 120.
In addition, during one second sensing after during first sensing in, signal selected cell 112 can be selected sensing signal Y
n, Y
N-k(not illustrating) is sent to signal sensing unit 114 and carries out difference relatively.At this, 2≤n≤p, 1≤(n-k)≤(p-1).For example, when k=1, its representation signal selected cell 112 is selected and sensing signal Y
nAdjacent sensing signal Y
N-1Reference signal during as the measurement testing capacitance.
That is to say, to same sensing signal Y
n, signal selected cell 112 can be selected different sensing signals in during adjacent sensing from non-selected sensing signal (be Y
N+k, Y
N-k) reference signal when measuring testing capacitance, and then reach the purpose of Dynamic Selection reference signal.
It should be noted, during adjacent sensing in, signal selected cell 112 is not limited to select the sensing signal Y of symmetry
N+k, Y
N-kReference signal when measuring testing capacitance, the reference signal when it selects different sensing signals as the measurement testing capacitance in can be during adjacent sensing from non-selected sensing signal.
In addition, in other embodiments, to same sensing signal Y
n, signal selected cell 112 during adjacent sensing in, also can from non-selected sensing signal, select the reference signal of identical sensing signal when measuring testing capacitance.
In the present embodiment, signal sensing unit 114 for example is a comparer (not illustrating), in order to the measured signal and the reference signal that receive and comparison signal selected cell 112 transmits, producing corresponding difference signal to control module 130, but the present invention is not limited to this.In another embodiment, signal sensing unit 114 for example is a differential amplifier.When signal sensing unit 114 was differential amplifier, it can relatively and amplify the voltage difference of measured signal and reference signal, and exports control module 130 to, to promote the accuracy rate of judging touch position.In addition, in another embodiment, signal sensing unit 114 an also available integrator is implemented.At this moment, the integrator integrable amplifies the voltage difference of measured signal and reference signal, to export corresponding difference signal to control module 130.
In the present embodiment, the difference signal that produces of signal sensing unit 114 for example is a simulating signal.Therefore after receiving this simulating signal, analog-digital converter 132 can be converted into a digital signal.Then, controller 134 carries out a digital operation to this digital signal again, to obtain on the touch-control input interface 120 touch position corresponding to this testing capacitance C (n)+Δ C.That is to say that controller 134 can judge that touch action occurs in the position of object sensing cell 120 according to difference signal.
It should be noted that in the present embodiment, touch-control sensing system 100 is that the touch-control system with the mutual capacitance type is example, but the present invention is not limited to this.In other embodiments, touch-control sensing system 100 also can be the touch-control system of self-capacitance type or the touch-control system of any other form.
In addition, in the present embodiment, signal selected cell 112 is the reference signals when selecting one of them sensing signal as the measurement testing capacitance from non-selected sensing signal.In another embodiment, the signal selected cell also can be from non-selected sensing signal be selected the reference signal of two sensing signals when measuring testing capacitance wherein simultaneously.
Fig. 3 is the block schematic diagram of the touch-control sensing system of another embodiment of the present invention.Please refer to Fig. 3, in the present embodiment, signal selected cell 312 is selected the reference signal of two sensing signals when measuring testing capacitance wherein simultaneously from non-selected sensing signal during one the 3rd sensing.For example, signal selected cell 312 is selected sensing signal Y simultaneously during the 3rd sensing
N+k, Y
N-kReference signal during as the measurement testing capacitance.Be example during with k=1, its representation signal selected cell 312 is selected and sensing signal Y
nAdjacent sensing signal Y
N+1, Y
N-1Reference signal during as the measurement testing capacitance.
It should be noted, during same sensing in, signal selected cell 312 is not limited to select the sensing signal Y of symmetry
N+k, Y
N-kReference signal during as the measurement testing capacitance, the reference signal when it can select any two different sensing signals as the measurement testing capacitance from non-selected sensing signal.
Fig. 4 is the block schematic diagram of the touch-control sensing system of another embodiment of the present invention.Please refer to Fig. 4, in the present embodiment, capacitance sensing apparatus 410 comprises a signal selected cell 412 and a plurality of signal sensings unit 414 (1)～414 (k).Control module 430 comprises a plurality of analog-digital converters 432 (1)～432 (k) and a controller 434.Wherein, when p is even number, k=p/2.
In the present embodiment, signal selected cell 412 is from different sensing signal Y
1-Y
pThe a plurality of signals of middle selection are as measured signal S
1-S
k, and from non-selected sensing signal, select a plurality of signals as reference signal R
1-R
k, and each signal sensing unit receives a measured signal and a reference signal, to export a difference signal to the corresponding simulating digital quantizer.
Fig. 5 illustrates signal selected cell 412 T during different sensings
1-T
kSelect different sensing signals to be sent to corresponding signal sensing unit as the reference signal.Please refer to Fig. 5, in Fig. 5, T during the sensing that first hurdle representative was carried out along with the time
1-T
k, and first row represent the corresponding measured signal in each hurdle or reference signal.For example, second hurdle representative T during sensing
1-T
k, signal selected cell 412 is selected sensing signal Y
1As measured signal S
1, and be sent to signal sensing unit 414 (1).Third column representation signal selected cell 412 is selected sensing signal Y respectively during different sensings
2, Y
4..., Y
pAs reference signal R
1, and be sent to signal sensing unit 414 (1).
By Fig. 4 and Fig. 5 as can be known, in the present embodiment, with regard to measured signal S
1-S
k, each signal sensing measured signal that the unit receives is also inequality.For example, T during sensing
1-T
k, the measured signal S that signal sensing unit 414 (1) receives
1Be sensing signal Y
1, and the measured signal S that signal sensing unit 414 (2) receives
2Be sensing signal Y
3In addition, during different sensings, the measured signal that same signal sensing unit receives is identical.For example, the measured signal S that during different sensings, receives of signal sensing unit 414 (1)
1All be sensing signal Y
1
In addition, in the present embodiment, with regard to reference signal R
1-R
k, same signal sensing unit reference signal difference that receives during different sensings.For example, the reference signal R that during different sensings, receives of signal sensing unit 414 (1)
1Be Y in regular turn
2, Y
4..., Y
p, and the reference signal R that signal sensing unit 414 (2) receives during different sensings
2Be Y in regular turn
4, Y
6..., Y
p, Y
2
Therefore, T during sensing
1-T
k, signal sensing unit 414 (1) compares sensing signal Y respectively
1With sensing signal Y
2, Y
4..., Y
pBetween difference, with the corresponding difference signal of output in regular turn to analog-digital converter 432 (1).Similarly, T during sensing
1-T
k, signal sensing unit 414 (2) compares sensing signal Y respectively
3With sensing signal Y
4, Y
6..., Y
p, Y
2Between difference, with the corresponding difference signal of output in regular turn to analog-digital converter 432 (2).
Therefore, controller 434 carries out a digital operation to a plurality of digital signals that receive during each sensing, to obtain the touch position of testing capacitance corresponding on the touch-control input interface 420.That is to say that controller 434 can judge that touch action occurs in the position of object sensing cell 420 according to difference signal.
Accordingly, each signal sensing unit of the touch-control sensing system 400 of present embodiment receives a measured signal and a reference signal, can effectively offset from the noise on the touch-control input interface 420, and then promote the jam-to-signal of its difference signal.Simultaneously, for each signal sensing unit, signal selected cell 412 selects different sensing signals to be sent to corresponding signal sensing unit as the reference signal, to reach the purpose of Dynamic Selection reference signal during different sensings.
It should be noted that the measured signal that Fig. 5 illustrates and the selection mode of reference signal are one example of the present invention embodiment, not in order to limit the present invention.Fig. 6 is another example of the present invention embodiment, and it illustrates signal selected cell 412 T during different sensings
1-T
kDifferent selection modes.
Fig. 7 is the flow chart of steps of the sensing method of touch control of one embodiment of the invention.Please be simultaneously with reference to Fig. 1 and Fig. 7, the sensing method of touch control of present embodiment comprises the steps.At first, in step S700, from a plurality of sensing signals, select at least one measured signal, for example from sensing signal Y
1-Y
pMiddle at least one measured signal Y that selects
nThen, in step S702, from non-selected sensing signal, select at least one reference signal, for example from non-selected sensing signal, select at least one reference signal Y
mAfterwards, in step S704, according to measured signal Y
nWith reference signal Y
mProduce a difference signal.Continue it, in step S706, judge that according to difference signal touch action occurs in the position of touch-control input interface.
In addition, the sensing method of touch control of embodiments of the invention can be obtained enough teachings, suggestion and implementation in the narration by Fig. 1～Fig. 6 embodiment, therefore repeats no more.
In addition, in an embodiment of the present invention, though the object sensing apparatus is to be example with the touch-control sensing system, the present invention is not limited to this.Any category that can be all institute of the present invention desire protection in order to the object sensing apparatus of sensing and decision objects position and contain.
In sum, in an embodiment of the present invention, the signal selected cell is selected at least one reference signal from a plurality of sensing signals be the measurement reference value of measured signal, can effectively offset the noise that comes from the outside, and then promote its jam-to-signal.In addition, during different sensings in, the signal selected cell is selected different reference signals, to reach the purpose that dynamic adjustment measures reference value.
Though the present invention discloses as above with embodiment; so it is not in order to limit the present invention; have in the technical field under any and know the knowledgeable usually; without departing from the spirit and scope of the present invention; when doing a little change and retouching, so protection scope of the present invention is as the criterion when looking the accompanying Claim scope person of defining.
Claims (29)
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| CN 201010115768 CN102156562B (en) | 2010-02-12 | 2010-02-12 | Object sensing device, touch sensing system and touch sensing method |
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| CN103677453B (en) * | 2012-08-30 | 2017-10-24 | 禾瑞亚科技股份有限公司 | Capacitive sensor and detection method thereof |
| US8970546B2 (en) * | 2012-08-31 | 2015-03-03 | Synaptics Incorporated | Method and apparatus for improved input sensing using a display processor reference signal |
| CN103049158B (en) * | 2012-12-31 | 2016-03-16 | 深圳市汇顶科技股份有限公司 | A kind of touch detecting method of capacitive touch screen and system |
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