CN103294289A - Capacitive touch system and method with automatic correction function - Google Patents
Capacitive touch system and method with automatic correction function Download PDFInfo
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- CN103294289A CN103294289A CN2012100548229A CN201210054822A CN103294289A CN 103294289 A CN103294289 A CN 103294289A CN 2012100548229 A CN2012100548229 A CN 2012100548229A CN 201210054822 A CN201210054822 A CN 201210054822A CN 103294289 A CN103294289 A CN 103294289A
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Abstract
The invention provides a capacitive touch system and method with an automatic correction function. A drive signal generator provides drive signals to a first electrode in sequence, and generates a plurality of sensing signal on a second electrode. A sensing signal receiver receives and processes the sensing signal. The sensing signal of a plurality of touch points under an untouched state is measured and stored in advance in an initial value generator, at the starting point of every measuring period, and the initial value generator generates the initial value of the sensing signal of the second electrode according to the pre-stored sensing signal, and provides the initial value to the sensing signal receiver to conduct initialization.
Description
Technical field
The present invention is relevant a kind of touch technology, particularly about capacitance touch control system and the method for a kind of tool from normal moveout correction.
Background technology
Contact panel (touch panel) can become Touch Screen in conjunction with display screen, and it is generally as the input interface of electronic installation, in order to detect the input of touching in the viewing area.The employed touch technology of contact panel has multiple, for example condenser type, resistance-type or optical profile type, and wherein, the capacitive touch control techniques is the main flow of present touch technology.
Capacitance type touch-control panel generally is made up of horizontal electrode and vertical electrode, and the described electrode place of crossing one another namely defines touch point.When the operation contact panel, be formed with electric field between two electrodes at touch point place.When the finger touches panel, the electric field of meeting stop portions causes the reduction of this place's capacitance.Utilize the variation of this capacitance, can be in order to detect the position of touch points.
Yet because the otherness of technology or assembling, the electrical specification of each touch point of capacitance type touch-control panel is not identical.Described otherness is possibly at the follow-up signal that carries out when handling (for example signal amplification), and signal value enters the saturation region of electronic component, makes can't distinguish between the signal of each touch point, thereby causes the mistake of touch detection.
Therefore, need the capacitance touch control system and the method that propose a kind of novelty badly, in order to the otherness between the above-mentioned touch point of normal moveout correction, to promote the accuracy of touch detection.
This shows that above-mentioned existing contact panel obviously still has inconvenience and defective, and demands urgently further being improved in method, product structure and use.Therefore how to found a kind of new tool from capacitance touch control system and the method for normal moveout correction, also becoming the current industry utmost point needs improved target.
Summary of the invention
The objective of the invention is to, overcome the defective that existing contact panel exists, and provide capacitance touch control system and the method for a kind of new tool from normal moveout correction, technical matters to be solved is to make it before the reception of carrying out signal is handled, initial value with pre-storage carries out initialization earlier, induced signal after avoiding handling causes saturated, thereby is promoted the accuracy of detecting, is very suitable for practicality.
The object of the invention to solve the technical problems realizes by the following technical solutions.A kind of tool that proposes according to the present invention wherein comprises from the capacitance touch control system of normal moveout correction: a plurality of first electrodes and a plurality of second electrode, and the infall of described first electrode and second electrode defines a plurality of touch points; One driving signal generator, it provides in regular turn and drives signal to described first electrode, and driven this first electrode should drive signal and produce a plurality of induced signals by capacitance coupling effect and lay respectively at described second electrode; One induced signal receiver receives and handles described induced signal; One position detector, it according to driven this first electrode and described induced signal, determines to touch a little position with detecting during each is measured; An and initial value generator, this initial value generator is measured and be stored in to the induced signal of at least part of this touch point under the state that is not touched in advance, beginning during each is measured, this initial value generator is according to the initial value of the induced signal that prestores with the induced signal that produces described second electrode, and offer this induced signal receiver, in order to it is carried out initialization.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid tool is from the capacitance touch control system of normal moveout correction, and wherein said induced signal receiver comprises a plurality of integrators, and its input end is electrically coupled to described second electrode respectively, and its output is fed to this position detector.
Aforesaid tool is from the capacitance touch control system of normal moveout correction, and wherein said integrator comprises: an amplifier; One integrating condenser controllably is electrically coupled between this amplifier input terminal and the output terminal; And at least one integral restrictor and at least one initial switch, when carrying out integration, this integral restrictor makes this integrating condenser be electrically coupled between this amplifier input terminal and the output terminal, in order to obtain the integration induced signal; When carrying out initialization, this initial switch makes this integrating condenser electric property coupling between this initial value generator and a reference potential, in order to this integrator is carried out precharge (pre-charge) to carry out initialization.
Aforesaid tool is from the capacitance touch control system of normal moveout correction, and wherein said amplifier comprises an operational amplifier, and its reverse input end and output terminal controllably are coupled to the two ends of this integrating condenser.
Aforesaid tool is from the capacitance touch control system of normal moveout correction, and wherein said initial value generator comprises: an initial value form, and it stores the initial value of the described touch point of at least a portion; One digital to analog converter (DAC), this initial value is converted to the simulation pattern after, be fed to the described integrator of this induced signal receiver successively, to carry out the initialization of described integrator; And a controller, in order to this initial value is fed to this digital to analog converter.
Aforesaid tool is from the capacitance touch control system of normal moveout correction, and the wherein said initial value that is not stored in the touch point of this initial value form is obtained through interpolative operation by the initial value of this controller according to this storage.
Aforesaid tool is from the capacitance touch control system of normal moveout correction, and wherein said initial value form is stored in a Nonvolatile memory.
Aforesaid tool is from the capacitance touch control system of normal moveout correction, and wherein said induced signal receiver more comprises a circuit, in order to obtain the induced signal difference of adjacent this second electrode, to be fed to this integrator.
The object of the invention to solve the technical problems also realizes by the following technical solutions.A kind of tool that proposes according to the present invention is from the capacitive touch control method of normal moveout correction, and wherein comprise: a plurality of first electrodes and a plurality of second electrode (a) are provided, and the infall of described first electrode and second electrode defines a plurality of touch points; (b) provide in regular turn and drive signal to described first electrode, driven this first electrode should drive signal and produce a plurality of induced signals by capacitance coupling effect and lay respectively at described second electrode; (c) receive and handle described induced signal; (d) during each is measured, according to driven this first electrode and described induced signal, to detect the position that determines to touch a little; (e) measure and be stored to the induced signal of this touch point of small part under the state that is not touched in advance; And (f) beginning during each is measured, according to the initial value of the induced signal that prestores with the induced signal that produces described second electrode, in order to carry out the initialization of integration.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid tool is from the capacitive touch control method of normal moveout correction, and wherein said step (c) comprises a plurality of integration steps, its respectively described second electrode of electric property coupling behind integration, integral result offered step (d) importing this induced signal.
Aforesaid tool is from the capacitive touch control method of normal moveout correction, and wherein said integration step more comprises: when carrying out initialization, carry out precharge (pre-charge) to carry out the initialization of integration.
Aforesaid tool is from the capacitive touch control method of normal moveout correction, and wherein said step (e) comprises: use an initial value form, to store the initial value of the described touch point of at least a portion.
Aforesaid tool is from the capacitive touch control method of normal moveout correction, and wherein said step (f) comprises: after this initial value is converted to the simulation pattern, carry out the initialization of integration successively.
Aforesaid tool is from the capacitive touch control method of normal moveout correction, wherein saidly more comprises: according to the initial value of this storage, behind interpolative operation, with the initial value of the touch point that is not stored in this initial value form.
Aforesaid tool is from the capacitive touch control method of normal moveout correction, and wherein said initial value form is stored in a Nonvolatile memory.
Aforesaid tool is from the capacitive touch control method of normal moveout correction, and the wherein said step that more comprises is in order to obtain the induced signal difference of adjacent this second electrode, to offer this integration step.
The object of the invention to solve the technical problems also realizes in addition by the following technical solutions.A kind of tool that proposes according to the present invention wherein comprises from the circuit for detecting of normal moveout correction: a signal receiver, have at least one detector, and each detector is detecting one signal during during at least one measurement each is measured; One initial value generator, measure and be stored to the initial value of small part detector during each measurement during at least one measurement in advance, beginning during each is measured, this initial value generator offers this signal receiver according to the initial value that prestores, in order to it is carried out initialization.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid tool is from the circuit for detecting of normal moveout correction, and wherein said each initial value that prestores is to store in digital form, and offers this signal receiver with simulating signal.
Aforesaid tool is from the circuit for detecting of normal moveout correction, and the initial value that wherein said at least part of detector prestores during each measurement during at least one measurement is to produce according to this signal that corresponding detector is detected during corresponding the measurement.
Aforesaid tool is from the circuit for detecting of normal moveout correction, wherein said initial value generator is the initial value of pre-nonresident portion detector during each measurement during at least one measurement, and be the initial value that interpolative operation is not stored in the touch point of this initial value form, to offer this induced signal receiver.
The present invention compared with prior art has tangible advantage and beneficial effect.By above technical scheme as can be known, major technique of the present invention thes contents are as follows: according to the embodiment of the invention, capacitance touch control system comprises a plurality of first electrodes and a plurality of second electrode, driving signal generator, induced signal receiver, position detector and initial value generator.The infall of described first electrode and second electrode defines a plurality of touch points.Driving signal generator provides in regular turn and drives signal to described first electrode, and driven first electrode will drive signal and produce a plurality of induced signals by capacitance coupling effect and lay respectively at described second electrode.The induced signal receiver receives and handles described induced signal.Position detector is during each is measured, according to driven first electrode and described induced signal, to detect the position that determines to touch a little.The initial value generator is measured and be stored in to the induced signal of at least part of touch point under the state that is not touched in advance, beginning during each is measured, this initial value generator is according to the initial value of the induced signal that prestores with the induced signal that produces described second electrode, and offer the induced signal receiver, in order to it is carried out initialization.Tool provided by the invention comprises a signal receiver and an initial value generator from the circuit for detecting of normal moveout correction.Signal receiver has at least one detector, and each detector is detecting one signal during each measurement during at least one measurement.In addition, the initial value of small part detector during each measurement during at least one measurement measured and be stored to the initial value generator in advance, beginning during each is measured, the initial value generator offers signal receiver according to the initial value that prestores, in order to it is carried out initialization.Tool provided by the invention can be to store initial value in digital form from the circuit for detecting of normal moveout correction, and offers signal receiver with simulating signal, to carry out initialization.Therefore can carry out initialization to signal receiver in the mode of programmable, the initialization during dynamically adjusting each and measuring.
By technique scheme, tool of the present invention has following advantage and beneficial effect at least from capacitance touch control system and the method for normal moveout correction: before carrying out the reception processing of signal, initial value with pre-storage carries out initialization earlier, induced signal after avoiding handling causes saturated, thereby is promoted the accuracy of detecting.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of instructions, and for above and other objects of the present invention, feature and advantage can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 shows that the tool of the embodiment of the invention is from the functional-block diagram of the capacitance touch control system of normal moveout correction.
Fig. 2 shows the induced signal receiver of Fig. 1 and thin portion circuit and the block scheme of initial value generator.
Fig. 3 A figure shows the thin portion circuit diagram of the induced signal receiver of another embodiment of the present invention.
Fig. 3 B shows the correlation timing figure of Fig. 3 A.
11: driving signal generator
12: the induced signal receiver
121: integrator
1211: amplifier
1211A: first amplifier
1211B: second amplifier
13: position detector
14: the initial value generator
141: the initial value form
142: controller
143: digital to analog converter (DAC)
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, the tool that foundation the present invention is proposed is from capacitance touch control system and its embodiment of method, method, step, structure, feature and the effect thereof of normal moveout correction, describe in detail as after.
Fig. 1 shows that the tool of the embodiment of the invention is from the functional-block diagram of the capacitance touch control system of normal moveout correction.In the present embodiment, tool comprises a plurality of first horizontal electrode Tx0-Txn and the second electrode Rx0-Rxn of a plurality of homeotropic alignments from the capacitance touch control system (hereinafter to be referred as touch-control system) of normal moveout correction, wherein the first electrode Tx0-Txn and the second electrode Rx0-Rxn be at a distance of a predeterminable range, thereby the touch point of each intersection forms an electric capacity.Touch-control system also comprises a driving signal generator 11, and it provides in regular turn and drives signal to the described first electrode Tx0-Txn, and described driving signal is generally AC signal, and for example pulse wave signal can be square wave or string ripple.During a certain, driven first electrode Tx can produce induced signal at the described second electrode Rx0-Rxn by capacitance coupling effect with driving signal, and described induced signal is received and handled by an induced signal receiver 12 again.At this moment, if pointed on driven first electrode Tx or the touching of conductive body (for example pointer), namely can have influence on the electric field of corresponding touch point, thereby produce unusual induced signal on the second electrode Rx of relevant position.The above-mentioned a certain first electrode Tx is activated and the described second electrode Rx0-Rxn produces induced signal, constitutes during the measurement.During each was measured, touch-control system used a position detector 13, microprocessing unit (MCU) for example, and it is according to the driven first electrode Tx and the unusual corresponding second electrode Rx of induced signal, determines to touch a little position with detecting.For example, look comparison before not touched induced signal and the variable quantity of the unusual induced signal when touched decide the position of touching a little, as obtain barycenter (centroid) position.
According to one of feature of the embodiment of the invention, consider each touch point because of technology or assemble the different capacitive coupling that otherness causes, can form inconsistent influence to the induced signal of each touch point, therefore, present embodiment (before for example dispatching from the factory) is in advance measured the induced signal of each touch point under the state that is not touched, and measured induced signal is stored (for example being stored in a Nonvolatile memory).When touch-control system during in practical operation, beginning during each is measured, initial value generator 14 is according to the initial value of signal with the induced signal that produces each second electrode Rx0-Rxn that prestore, and offers induced signal receiver 12, in order to induced signal receiver 12 is carried out initialization.After the second electrode Rx0-Rxn produced induced signal, this induced signal namely was subjected to the compensation of this initial value, thereby made that each touch point obtains proofreading and correct.For example, before dispatching from the factory, a certain touch point measures induced signal under the state that is not touched be 1 volt through the initial value of integration.When touch-control system during in practical operation, initial value generator 14 provides-1 volt to induced signal receiver 12.After the corresponding second electrode Rx of this touch point produced induced signal, this induced signal namely can be subjected to the compensation correction of this initial value (1 volt).Aforementioned initial value can be on the occasion of or negative value.
Fig. 2 shows the induced signal receiver 12 of Fig. 1 and thin portion circuit and the block scheme of initial value generator 14.In the present embodiment, induced signal receiver 12 comprises a plurality of integrators 121, and electric property coupling is from a plurality of second electrode Rx0-Rxn (or being called passage) respectively in its input, and its output then is fed to position detector 13 (not being shown among Fig. 2).Know clearly it, integrator 121 mainly is made up of amplifier 1211 and integrating condenser C.Amplifier 1211 can be operational amplifier, but is not limited to this.Integrating condenser C controllably (controllably) is electrically coupled between (oppositely) input end and output terminal of amplifier 1211.Integrator 121 also comprises a plurality of integral restrictor w and initial switch c.As shown in the figure, when carrying out integration, integral restrictor w can closure and initial switch c for disconnecting (for example being controlled by a microprocessing unit), make integrating condenser C be electrically coupled between (oppositely) input end and output terminal of amplifier 121, in order to obtain the integration induced signal; When carrying out initialization, integral restrictor w can disconnect and initial switch c for closed, make integrating condenser C be electrically coupled between initial value generator 14 and the reference potential (for example ground connection), in order to integrator 121 is carried out precharge (pre-charge) to carry out initialization.It should be noted that when carrying out initialization electric charge charges near the electrode of amplifier 121 output terminals from integrating condenser C, and when carrying out integration, electric charge then is to charge near the electrode of amplifier 121 (oppositely) input end from integrating condenser C.Whereby, for the integration induced signal that integrator 121 produces, when the initial value that integrator 121 provides according to initial value generator 14 carries out initialization, the negative value of this initial value will be produced in fact.In addition, before carrying out initialization, generally also can use replacement switch (be not shown in graphic in), in order to the charge discharge in the integrating condenser C (discharge).
In the present embodiment, initial value generator 14 mainly comprises an initial value form 141, can be stored in the internal memory, for example Nonvolatile memory.In an example, initial value form 141 stores the initial value of all touch points of touch-control system.In another example, for each second electrode Rx (or passage) the touch point of the corresponding first electrode Tx0-Txn, initial value form 141 is the initial value of storage compartment touch point only, at least one touch point of for example being separated by between the touch point of Chu Cuning, as the odd number first electrode (Tx1, Tx3 ...) touch point.As for the initial value of the touch point that is not stored in initial value form 141, then can carry out before the initialization, obtained with the interpositioning computing according to the initial value that stores by controller 142 (for example microprocessing unit).Whereby, can save memory headroom in a large number and can materially affect not arrive the touch-control accuracy again.
Then, controller 142 is fed to digital to analog converter (DAC) 143 with the initial value of initial value form 141 (or interpolative operation obtain initial value), behind the initial value through being converted to the simulation pattern, be fed to the described integrator 121 of induced signal receiver 12 successively, to carry out the initialization of integrator 121.
As previously mentioned, induced signal receiver 12 is electrically coupled to the second electrode Rx0-Rxn (or being called passage), to handle the induced signal of the described second electrode Rx0-Rxn.With embodiment illustrated in fig. 2, described integrator 121 directly receives the induced signal of the described second electrode Rx0-Rxn, but is not limited to this.Fig. 3 A shows the thin portion circuit diagram of the induced signal receiver 12 of another embodiment of the present invention, and Fig. 3 B shows the correlation timing figure of Fig. 3 A.For simplicity, only illustration two channel C H0 and CH1 wherein.Present embodiment receives and handles the induced signal of the described second electrode Rx0-Rxn indirectly, and in other words, present embodiment receives and handle derivation (derived) induced signal of the described second electrode Rx0-Rxn.The details of present embodiment can be with reference to the temporary transient application case of the present patent application people's United States Patent (USP), application case number the 61/564th, No. 995, and its content is considered as the part of instructions of the present invention.
The integrator 121 of present embodiment uses integral restrictor k0w0/k0w1 and initial switch k0c0/k0c1 to switch between integration and the initialization, and its operation is same as previous embodiment, therefore will not narrate.Different with last embodiment is that the integration of present embodiment is divided into the two-stage execution.The first integral stage, that is when switch p1 is closed (switch p2 is for disconnecting), the first amplifier 1211A of first passage CH0 and the first capacitor C1A carry out repeatedly (for example three times) integration by K switch 1, and relending by K switch 2 for the first time, integral result is fed to the second amplifier 1211B to carry out the integration second time.Meanwhile, the first amplifier 1211A and the second capacitor C1B of second channel CH1 carry out repeatedly integration by K switch 1, relend by K switch 2 for the first time the negative value of integral result and are fed to the second amplifier 1211B and carry out the integration second time.Whereby, be fed to the second amplifier 1211B person and be the induced signal difference of this two channel.In like manner, in the second integral stage, that is when switch p2 is closed (switch p1 is for disconnecting), be fed to the induced signal difference that the second amplifier 1211B person also is this two channel.The induced signal receiver 12 of present embodiment is handled the induced signal difference of adjacent channels, but not single channel induced signal itself, thereby is reduced the influence of outside noise (for example noise that display panel produces).In addition, also can therefore omit the screen layer between contact panel and the display panel, thereby be minimized thickness and the cost of touch-control system.
Comprehensively above-mentioned, the invention provides a kind of tool from the circuit for detecting of normal moveout correction, comprise a signal receiver and an initial value generator.Signal receiver has at least one detector, and each detector is detecting one induced signal during each measurement during at least one measurement.Described detector can be aforesaid integrator or other electrical signals metering circuit, the signal that receives with detecting.Signal receiver can be the aforesaid induced signal of detecting, also can be other electrical signals to be measured of detecting.In addition, detector can be during the different measurement electrical couplings in identical or different circuit.For example when the detector lazy weight when once having detected all circuit to be detected, detector can be that the gradation circuit detecting that all are to be detected finishes during different measurements.Again for example, detector be the different measuring cycle to identical circuit to be detected detecting.For example be provided when driving signal at the first different electrodes, i.e. different measuring period is to identical second electrode detecting induced signal.
The initial value generator is as discussed previously, measure and be stored to the initial value of small part detector during each measurement during at least one measurement in advance, and the beginning during each is measured offers signal receiver according to the initial value that prestores, in order to it is carried out initialization.Each initial value that prestores is to store in digital form, and offers signal receiver with simulating signal.In addition, the initial value that prestores during during at least one measurement each is measured of aforesaid at least part of detector is that this signal according to the detecting during corresponding measurement of corresponding detector produces.For example, when the first different electrodes is provided the driving letter, namely during the corresponding different measurement, according to the induced signal generation of each detector detecting.
In addition, the initial value generator is the initial value of pre-nonresident portion detector during each measurement during at least one measurement, and is the initial value that interpolative operation is not stored in the touch point of this initial value form, to offer this induced signal receiver.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be not break away from the technical solution of the present invention content, any simple modification that foundation technical spirit of the present invention is done above embodiment, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (20)
1. a tool is characterized in that comprising from the capacitance touch control system of normal moveout correction:
A plurality of first electrodes and a plurality of second electrode, the infall of described first electrode and second electrode defines a plurality of touch points;
One driving signal generator, it provides in regular turn and drives signal to described first electrode, and driven this first electrode should drive signal and produce a plurality of induced signals by capacitance coupling effect and lay respectively at described second electrode;
One induced signal receiver receives and handles described induced signal;
One position detector, it according to driven this first electrode and described induced signal, determines to touch a little position with detecting during each is measured; And
One initial value generator, this initial value generator is measured and be stored in to the induced signal of at least part of this touch point under the state that is not touched in advance, beginning during each is measured, this initial value generator is according to the initial value of the induced signal that prestores with the induced signal that produces described second electrode, and offer this induced signal receiver, in order to it is carried out initialization.
2. tool as claimed in claim 1 is characterized in that from the capacitance touch control system of normal moveout correction wherein said induced signal receiver comprises a plurality of integrators, and its input end is electrically coupled to described second electrode respectively, and its output is fed to this position detector.
3. tool as claimed in claim 2 is characterized in that from the capacitance touch control system of normal moveout correction wherein said integrator comprises:
One amplifier;
One integrating condenser controllably is electrically coupled between this amplifier input terminal and the output terminal; And
At least one integral restrictor and at least one initial switch, when carrying out integration, this integral restrictor makes this integrating condenser be electrically coupled between this amplifier input terminal and the output terminal, in order to obtain the integration induced signal; When carrying out initialization, this initial switch makes this integrating condenser electric property coupling between this initial value generator and a reference potential, in order to this integrator is carried out precharge to carry out initialization.
4. tool as claimed in claim 3 is characterized in that from the capacitance touch control system of normal moveout correction wherein said amplifier comprises an operational amplifier, and its reverse input end and output terminal controllably are coupled to the two ends of this integrating condenser.
5. tool as claimed in claim 2 is characterized in that from the capacitance touch control system of normal moveout correction wherein said initial value generator comprises:
One initial value form, it stores the initial value of the described touch point of at least a portion;
One digital to analog converter, this initial value is converted to the simulation pattern after, be fed to the described integrator of this induced signal receiver successively, to carry out the initialization of described integrator; And
One controller is in order to be fed to this digital to analog converter with this initial value.
6. tool as claimed in claim 5 is characterized in that from the capacitance touch control system of normal moveout correction the wherein said initial value that is not stored in the touch point of this initial value form is obtained through interpolative operation by the initial value of this controller according to this storage.
7. tool as claimed in claim 5 is characterized in that from the capacitance touch control system of normal moveout correction wherein said initial value form is stored in a Nonvolatile memory.
8. tool as claimed in claim 2 is characterized in that wherein said induced signal receiver more comprises a circuit, in order to obtain the induced signal difference of adjacent this second electrode, to be fed to this integrator from the capacitance touch control system of normal moveout correction.
9. a tool is characterized in that comprising from the capacitive touch control method of normal moveout correction:
(a) provide a plurality of first electrodes and a plurality of second electrode, the infall of described first electrode and second electrode defines a plurality of touch points;
(b) provide in regular turn and drive signal to described first electrode, driven this first electrode should drive signal and produce a plurality of induced signals by capacitance coupling effect and lay respectively at described second electrode;
(c) receive and handle described induced signal;
(d) during each is measured, according to driven this first electrode and described induced signal, to detect the position that determines to touch a little;
(e) measure and be stored to the induced signal of this touch point of small part under the state that is not touched in advance; And
(f) beginning during each is measured is according to the initial value of the induced signal that prestores with the induced signal that produces described second electrode, in order to carry out the initialization of integration.
10. tool as claimed in claim 9 is from the capacitive touch control method of normal moveout correction, it is characterized in that wherein said step (c) comprises a plurality of integration steps, its respectively described second electrode of electric property coupling behind integration, integral result offered step (d) importing this induced signal.
11. tool as claimed in claim 10, is characterized in that wherein said integration step more comprises from the capacitive touch control method of normal moveout correction:
When carrying out initialization, carry out precharge to carry out the initialization of integration.
12. tool as claimed in claim 10, is characterized in that wherein said step (e) comprises from the capacitive touch control method of normal moveout correction:
Use an initial value form, to store the initial value of the described touch point of at least a portion.
13. tool as claimed in claim 12, is characterized in that wherein said step (f) comprises from the capacitive touch control method of normal moveout correction:
With this initial value be converted to the simulation pattern after, carry out the initialization of integration successively.
14. tool as claimed in claim 12 is characterized in that more comprising from the capacitive touch control method of normal moveout correction:
According to the initial value of this storage, behind interpolative operation, with the initial value of the touch point that is not stored in this initial value form.
15. tool as claimed in claim 12, is characterized in that wherein said initial value form is stored in a Nonvolatile memory from the capacitive touch control method of normal moveout correction.
16. tool as claimed in claim 10 from the capacitive touch control method of normal moveout correction, is characterized in that more comprising a step, in order to obtain the induced signal difference of adjacent this second electrode, to offer this integration step.
17. a tool is characterized in that comprising from the circuit for detecting of normal moveout correction:
One signal receiver has at least one detector, and each detector is detecting one signal during each measurement during at least one measurement;
One initial value generator, measure and be stored to the initial value of small part detector during each measurement during at least one measurement in advance, beginning during each is measured, this initial value generator offers this signal receiver according to the initial value that prestores, in order to it is carried out initialization.
18. tool as claimed in claim 17, is characterized in that wherein said each initial value that prestores is to store in digital form from the circuit for detecting of normal moveout correction, and offers this signal receiver with simulating signal.
19. tool as claimed in claim 17, is characterized in that the initial value that wherein said at least part of detector prestores is to produce according to this signal that corresponding detector is detected from the circuit for detecting of normal moveout correction during corresponding the measurement during each measurement during at least one measurement.
20. tool as claimed in claim 17 is from the circuit for detecting of normal moveout correction, it is characterized in that wherein said initial value generator is the initial value of pre-nonresident portion detector during each measurement during at least one measurement, and be the initial value that interpolative operation is not stored in the touch point of this initial value form, to offer this induced signal receiver.
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| CN201210054822.9A CN103294289B (en) | 2012-03-02 | 2012-03-02 | The capacitance touch control system of tool automatic calibration and method |
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| CN201210054822.9A CN103294289B (en) | 2012-03-02 | 2012-03-02 | The capacitance touch control system of tool automatic calibration and method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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