CN1797309A - Interpretation method for touch controlled induction system - Google Patents
Interpretation method for touch controlled induction system Download PDFInfo
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- CN1797309A CN1797309A CN 200410061576 CN200410061576A CN1797309A CN 1797309 A CN1797309 A CN 1797309A CN 200410061576 CN200410061576 CN 200410061576 CN 200410061576 A CN200410061576 A CN 200410061576A CN 1797309 A CN1797309 A CN 1797309A
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000035945 sensitivity Effects 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 abstract description 4
- 238000009434 installation Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000005381 potential energy Methods 0.000 description 3
- 238000000151 deposition Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
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- 230000005540 biological transmission Effects 0.000 description 1
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- 239000011889 copper foil Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Abstract
The invention is a determining method for a touch-controlled induction device, where the induction device comprises at least a key-press and a memory, and each key-press is connected with a capacitor and the determining method comprises the steps of: charging each capacitor to obtain at least a voltage reference value; storing each voltage reference value into the memory; touching at least a key-press; scanning each key-press to obtain a voltage varying value of each capacitor; and comparing with each voltage reference value to determine which key-presses are touched.
Description
Technical field
The present invention is meant a kind of interpretation method of touch control induction device, refers to a kind of interpretation method of capacitance touching control induction installation especially.
Background technology
General touch control induction device can be divided into two kinds of resistance-type and condenser types in system design, with capacitance touching control induction installation commonly used, in order to want which button on the judgment means that touched arriving arranged, usually can be when device starts, note down at the current potential energy that some buttons filled earlier, the numerical value that utilizes this current potential numerical value and other to have the current potential energy that keyswitch filled of equivalent capacity afterwards again compares; If be lower than this numerical value, system judges that promptly this button is pressed; If be greater than or equal to this numerical value, system will ignore.
Start with the circuit component of reality, at first, this induction installation can be sent the Trackpad (Pad) that a continuous pulse wave is given the capacity cell of some buttons or had an equivalent electric capacity, the other end of this capacity cell and this equivalence electric capacity then is to be connected in an integrator to carry out energy storage at this continuous pulse wave, after treating that this continuous pulse wave transmission finishes, the waveform of institute's integration promptly can be exaggerated and be converted to digital signal, this digital signal can be deposited in the storer at last, the numerical value that is deposited in is the accurate position of bias voltage (bias level), then, touch-control sensing district that need only this induction installation of continuous sweep, with the integration current potential of each point on the induction zone via amplify and convert digital signal to after carrying out numeric ratio with accurate of the previous bias voltage of noting down; And when the numerical value of each point in the touch-control sensing district was lower than the accurate position of original bias voltage, this induction installation can have been judged touched the arriving of which point.
Though the shared system storage of this kind classic method is very few, if but this touch control induction device is when needing the huge button of usage quantity, can be because the capacitance error of a plurality of coupling capacitances or the error of the equivalent capacity on the Trackpad cause the sensitivity of device and reconnaissance range to be had a strong impact on; Therefore, though being applied to the few system aspects of button amount, this method is difficult for exerting an influence, but if use in the system of touch control induction device with many buttons, then can be inhomogeneous because of the stored energy of the equivalent capacity of each point, and cause can't promoting of reconnaissance range and sensitivity.
In order to improve this defective, all be to improve traditionally, but still can't overcome right following two difficult problems so far at the equivalent capacity on coupling capacitance and the Trackpad:
(1) though the capacitance of each electric capacity mark is identical, each electric capacity can also have a little difference because of a little error causes capacitance in the process of making, and therefore the voltage that is filled under time and the certain condition of electric current maintenance will be different; Therefore, improved, then must be measured at each electric capacity earlier if will put thus.
(2) equivalent capacity that Trackpad had that is designed on the circuit board can be because in washing the process of plate, because the Copper Foil or the thickness of circuit board plate material is inhomogeneous, and causes the appearance value of equivalent capacity that Trackpad forms also different; Therefore, if will make the identical equivalent capacity that then will adjust Trackpad of the current potential energy that is filled, it is possible to make it reach the identical ability of capacitance.
Summary of the invention
Fundamental purpose of the present invention is for reconnaissance range that will promote the capacitance touching control induction installation and sensitivity.
Another object of the present invention is carried out the touch-control sensing detecting of many buttons for helping the capacitance touching control induction installation, and can not be affected because of the inhomogeneous of electrical undesirableization of outer member or the equivalent capacity of Trackpad.
Main conception of the present invention is that the energy that the equivalent capacity of each point button required on the touch control induction device is stored is all noted down in the storer; When this numerical value of depositing with last time different, then touch control induction device will learn that some button is pressed, and can must reach the degree what are lower than by the value that microcontroller is controlled each record and promptly produce movement response.
According to main conception of the present invention, a kind of interpretation method of touch control induction device is proposed, wherein this touch control induction device comprises a Trackpad (Pad) and a storer, and this Trackpad is connected at least one equivalent capacity, and this interpretation method comprises the following steps: that (a) should charge to obtain at least one potential reference value by equivalence electric capacity at each; (b) deposit each this potential reference value in this storer; (c) touch this Trackpad; (d) scan this Trackpad to obtain at least one potential variation value that each should equivalence electric capacity; And (e) each this potential reference value and with respect to each this potential variation value of each this potential reference value relatively, touched with on this Trackpad of interpretation which point.
According to main conception of the present invention, the interpretation method of another kind of touch control induction device is proposed, wherein this touch control induction device comprises an at least one button and a storer, and each this button is connected in an electric capacity, and this interpretation method comprises the following steps: that (a) charges to obtain at least one potential reference value at each this electric capacity; (b) deposit each this potential reference value in this storer; (c) at least one this button of touching; (d) scan each this button to obtain a potential variation value of each this electric capacity; And (e) each this potential reference value and with respect to each this potential variation value of each this potential reference value relatively, touched with which this button of interpretation.
The present invention is by following accompanying drawing and detailed description, can be by more deep understanding:
Description of drawings
Fig. 1 is the process flow diagram and the signal waveforms of embodiment of the present invention;
Fig. 2 is the structural representation of first kind of capacitance touching control induction installation of the present invention;
Fig. 3 is the structural representation of second kind of capacitance touching control induction installation of the present invention;
Fig. 4 is the signal waveforms that the present invention's first continuous pulse wave is sent to electric capacity;
Fig. 5 is the input/output signal oscillogram of integrator of the present invention;
Fig. 6 is the signal output waveform figure of operational amplifier of the present invention; And
Fig. 7 is the signal output waveform figure of analog/digital converter of the present invention.
Embodiment
Principle of the present invention is, at first the charge value that must deposit each button in is used as potential reference value, so that the comparison of each point button potential change after touching to be provided, energy of a charge when hand contacts on the button will be attracted by finger, and the charging potential value of button ought to be lower than original charging potential reference value at this moment, and that button that this moment, microcontroller just can be judged in the button is pressed.
Now process flow diagram and the signal waveforms with the embodiment of the present invention that cooperates Fig. 1 explains:
On the flow process of microprocessor controls system acting, be broadly divided into (1) and store two stages such as potential reference value and (2) key scan;
(1) stores the potential reference value stage
A. export on the equivalent capacity or the electric capacity of all buttons of one first continuous pulse wave to a Trackpad by the output terminal of microcontroller earlier.
B. this first pulse wave can induce one first energy by the other end after via the equivalent capacity electric capacity or the electric capacity of button, and deposits in the integrator.
C. one first waveform of integrator being exported inputs to operational amplifier and amplifies to carry out signal.
D. the output of operational amplifier is after converting one first digital signal to via A/D conversion circuit, and this on dutyly certain proportional numers (as 95% or 90%; Being multiplied by certain proportional numers herein, is in order freely to control the height of sensitivity; If it is low more that proportional numers is set, then the sensitivity meeting of touch-control descends; If that sets is too high, then may disturb because of any promptly causes the situation of microcontroller erroneous judgement to occur, therefore it can be adjusted at the mechanism of outside electrical equipment, to reach best touch-control scope) afterwards, restore in the storer, as potential reference value,, discharge the electric charge of this button on the integrator at last so that the usefulness of follow up scan each point to be provided.
E. after all depositing in the potential reference value of the electric capacity of all Trackpads or button in the storer, just can enter the next key scan stage, and wait for that the user touches button or Trackpad.
(2) the key scan stage
After the user touches button or Trackpad, promptly enter the key scan stage, action is identical to steps d with the step a that stores the potential reference value stage at the beginning;
F. earlier export one second continuous pulse wave to the equivalent capacity or the electric capacity of all buttons of this Trackpad by the output terminal of microcontroller.
G. this second pulse wave can induce one second energy by the other end after via the equivalent capacity electric capacity or the electric capacity of button, and deposits in the integrator.
H. one second waveform of integrator being exported inputs to operational amplifier and amplifies to carry out signal.
I. the output of operational amplifier is after converting one second digital signal to via A/D conversion circuit, and this second digital signal is this button or Trackpad is touched potential variation value afterwards by the user.
J. this potential reference value in this potential variation value and the storer is compared; When this potential variation value is lower than this potential reference value, expression has the people to touch this button or Trackpad, microcontroller is promptly sent coordinate values, and next button of continuation scanning, otherwise, if this potential variation value of this button or Trackpad, is represented the unmanned touching of this button more than or equal to this potential reference value, microcontroller is promptly ignored, and continues next button of scanning.
What deserves to be mentioned is, implement this storer used in the present invention and can be a random access memory, and if outage or reset switch take place in system when starting, microcontroller then must recomputate and store potential reference value.
The interpretation method of capacitance touching control induction installation of the present invention can be by Fig. 2 (a) and Fig. 2 two kinds of frameworks such as (b) to detect, it is all at present on the market the mode of the most normal use, as shown in the figure, Fig. 2 (a) be with capacitor design on the circuit board of Trackpad, make circuit board produce many equivalent capacitys, Fig. 2 (b) directly connects a last capacity cell to carry out the electric charge coupling in each button.Wherein, each equivalent capacity in Fig. 2 (a) can be designed to different shape, comb type as shown in Figure 3, snake type and helical type etc., but interpretation method of the present invention need not stick to the shape of equivalent capacity among the figure, and can reach needed sensitivity.
Signal waveforms with the reality of Fig. 4 to Fig. 7 explains orally; After starting, the capacitance touching control induction installation can be introduced into the potential reference value stage that stores, the purpose in this stage is to deposit in the rheobase energy of all buttons and offers the each point current potential to compare, can produce a series of pulse wave under stage in the storage potential reference value and give a capacity cell or equivalent capacity, as shown in Figure 4.The other end of capacity cell or equivalent capacity can induce the power of an energy of a charge under duration of charging zone and discharge time zone, and it is inputed to integrator, as shown in Figure 5.The integrator output class is similar to the waveform of sawtooth wave shape, wherein, because the signal amplitude of integrator output is too small, therefore must signal be strengthened via an operational amplifier, as shown in Figure 6.At last, after converting thereof into the digital signal of Fig. 7 through the analog/digital circuit, microcontroller again with this last proportional numers on duty to become a potential variation value (in the minimum initiate potential condition that enters key scan each button during the stage why this proportional numers is in order will clearly to know in the future), at last, this potential variation value can be deposited in the storer.
Storing after the potential reference value stage finishes, will enter the key scan stage, this stage equally can be via the handling procedure of integrator, operational amplifier and A/D conversion circuit behind each button of scanning; When changing into digital signal after obtaining potential variation value, the potential reference value of itself and this button can be compared, if this potential variation value is lower than this potential reference value, then microcontroller can judge that this button is pressed, at last by the coordinate output of I/O end (I/O) with button.
Though the microcontroller in the foregoing description is to reach purpose of the present invention in the mode that is arranged with storer and integrator branch, storer and integrator can also be integrated in the microcontroller to reach goal of the invention of the present invention on actual fabrication.
In sum, the interpretation method of touch control induction device of the present invention can increase the sensing range and the sensitivity of capacitance touching control induction installation significantly, simultaneously the pattern of touch controlled key with quantitatively can carry out various flexible designs and various variation, and can not be affected because of the inhomogeneous of electrical undesirableization of outer member or the equivalent capacity of Trackpad.
Claims (10)
1. the interpretation method of a touch control induction device, wherein this touch control induction device comprises a Trackpad and a storer, and this Trackpad is connected at least one equivalent capacity, this interpretation method comprises the following steps:
(a) should charge to obtain at least one potential reference value by equivalence electric capacity at each;
(b) deposit each this potential reference value in this storer;
(c) touch this Trackpad;
(d) scan this Trackpad to obtain at least one potential variation value that each should equivalence electric capacity; And
(e) each this potential reference value and relatively with respect to each this potential variation value of each this potential reference value, touched with on this Trackpad of interpretation which point.
2. interpretation method as claimed in claim 1 it is characterized in that this touch control induction device also comprises an integrator, and step (a) comprises that also step is as follows:
(a1) provide one first pulse wave to each should make it induce one first energy by equivalence electric capacity;
(a2) deposit this first energy in this integrator;
(a3) one first output waveform of this integrator is amplified and be converted into one first digital signal; And
(a4) this first digital signal be multiply by a proportional numers to become this potential reference value.
3. interpretation method as claimed in claim 2 is characterized in that this proportional numers of step (a4) can be specified by the user, freely to adjust the height of touch-control sensitivity.
4. interpretation method as claimed in claim 1 is characterized in that step (b) also comprises a step: remove this energy in this integrator.
5. interpretation method as claimed in claim 1, it is characterized in that step (c) and (d) between comprise that also step is as follows:
(c1) provide one second pulse wave to each should make it induce one second energy by equivalence electric capacity;
(c2) deposit this second energy in this integrator; And
(c3) one second output waveform of this integrator is amplified and be converted into one second digital signal, this second digital signal is this potential variation value.
6. as the arbitrary described interpretation method of claim 1-5, it is characterized in that this touch control induction device all comprises a microcontroller, in order to control each step.
7. as the arbitrary described interpretation method of claim 1-5, it is characterized in that this touch control induction device comprises this storer and this integrator is to be integrated in the microcontroller.
8. interpretation method as claimed in claim 1 is characterized in that this storer is to be a random access memory.
9. the interpretation method of a touch control induction device, wherein this touch control induction device comprises an at least one button and a storer, and each this button is connected in an electric capacity, this interpretation method comprises the following steps:
(a) charge to obtain at least one potential reference value at each this electric capacity;
(b) deposit each this potential reference value in this storer;
(c) at least one this button of touching;
(d) scan each this button to obtain a potential variation value of each this electric capacity; And
(e) each this potential reference value and relatively with respect to each this potential variation value of each this potential reference value, touched with which this button of interpretation.
10. interpretation method as claimed in claim 9 it is characterized in that this touch control induction device also comprises an integrator, and step (a) comprises that also step is as follows:
(a1) provide one first pulse wave to each this electric capacity to make it induce one first energy;
(a2) deposit this first energy in this integrator;
(a3) one first output waveform of this integrator is amplified and be converted into one first digital signal; And
(a4) this first digital signal be multiply by a proportional numers to become this potential reference value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100615765A CN100336005C (en) | 2004-12-27 | 2004-12-27 | Interpretation method for touch controlled induction system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100615765A CN100336005C (en) | 2004-12-27 | 2004-12-27 | Interpretation method for touch controlled induction system |
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| CN1797309A true CN1797309A (en) | 2006-07-05 |
| CN100336005C CN100336005C (en) | 2007-09-05 |
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| CNB2004100615765A Expired - Fee Related CN100336005C (en) | 2004-12-27 | 2004-12-27 | Interpretation method for touch controlled induction system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101963865A (en) * | 2010-09-30 | 2011-02-02 | 江苏惠通集团有限责任公司 | Touch identification method, touch key structure and touch device |
| CN102221946A (en) * | 2011-03-25 | 2011-10-19 | 苏州瀚瑞微电子有限公司 | Method for indentifying water proofing of capacitive touch panel |
| CN101957699B (en) * | 2009-07-15 | 2013-06-19 | 瑞鼎科技股份有限公司 | Touch input device and touch sensing circuit |
| TWI427511B (en) * | 2010-03-09 | 2014-02-21 | Innolux Corp | Method for determining location of touched point |
| TWI563441B (en) * | 2015-11-11 | 2016-12-21 | Focaltech Electronics Ltd | Touch apparatus, capacitive touch detecting circuit thereof and touch detecting method using the same |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI488098B (en) * | 2013-03-13 | 2015-06-11 | Tenx Shenzhen Technology Ltd | Capacitive touching controlling system, initialization method thereof, and touch control detection method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP0580833B1 (en) * | 1992-01-07 | 1996-09-04 | Signature Technologies, Inc. | Method and apparatus for controlling a press |
| JPH06236230A (en) * | 1993-02-10 | 1994-08-23 | Ricoh Co Ltd | Coordinate detecting device |
| JP3456261B2 (en) * | 1994-07-15 | 2003-10-14 | セイコーエプソン株式会社 | Touch panel device |
| JP2000250690A (en) * | 1999-02-26 | 2000-09-14 | Nec Shizuoka Ltd | Virtual keyboard system |
| JP2004078323A (en) * | 2002-08-09 | 2004-03-11 | Canon Inc | Coordinate input system and coordinate calculation method |
-
2004
- 2004-12-27 CN CNB2004100615765A patent/CN100336005C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101957699B (en) * | 2009-07-15 | 2013-06-19 | 瑞鼎科技股份有限公司 | Touch input device and touch sensing circuit |
| TWI427511B (en) * | 2010-03-09 | 2014-02-21 | Innolux Corp | Method for determining location of touched point |
| CN101963865A (en) * | 2010-09-30 | 2011-02-02 | 江苏惠通集团有限责任公司 | Touch identification method, touch key structure and touch device |
| CN101963865B (en) * | 2010-09-30 | 2012-07-25 | 江苏惠通集团有限责任公司 | Touch identification method, touch key structure and touch device |
| CN102221946A (en) * | 2011-03-25 | 2011-10-19 | 苏州瀚瑞微电子有限公司 | Method for indentifying water proofing of capacitive touch panel |
| TWI563441B (en) * | 2015-11-11 | 2016-12-21 | Focaltech Electronics Ltd | Touch apparatus, capacitive touch detecting circuit thereof and touch detecting method using the same |
| US20170131807A1 (en) * | 2015-11-11 | 2017-05-11 | Focaltech Electronics, Ltd | Touch apparatus, capacitive touch sensing circuit thereof, and touch sensing method using the same |
| US9836172B2 (en) * | 2015-11-11 | 2017-12-05 | Focaltech Electronics, Ltd. | Touch apparatus, capacitive touch sensing circuit thereof, and touch sensing method using the same |
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| Publication number | Publication date |
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| CN100336005C (en) | 2007-09-05 |
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