CN1797308A - Interpretation method for touch controlled induction system - Google Patents
Interpretation method for touch controlled induction system Download PDFInfo
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- CN1797308A CN1797308A CN 200410060391 CN200410060391A CN1797308A CN 1797308 A CN1797308 A CN 1797308A CN 200410060391 CN200410060391 CN 200410060391 CN 200410060391 A CN200410060391 A CN 200410060391A CN 1797308 A CN1797308 A CN 1797308A
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- 230000006698 induction Effects 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000035945 sensitivity Effects 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 abstract description 11
- 238000009434 installation Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
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Abstract
The invention is a determining method for a touch control induction device comprising a touch control pad at least connected to m X n equivalent capacitors, where m is number of equivalent capacitors in the X-axis direction and n is that in the Y-axis direction, and the determining method comprises the steps of: charging m equivalent capacitors of a column to obtain m digital signals; comparing them with one another and using the smallest as a potential reference value; repeating the above two steps to obtain n potential reference values; touching the touch control pad; scanning the touch control pad to obtain at least a potential variation value relative to m equivalent capacitors of at least a column; and comparing the potential reference value with the potential variation value to determine which point in this column on the touch control pad is 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, present employed method for detecting has three kinds, outlines as follows now:
(1) compare with the charging potential of all buttons after writing down the current potential of one of them touch controlled key, microcontroller can learn that at last which button is pressed again:
At first microcontroller can enter the potential reference value stage that stores, system can send the equivalent capacity of a continuous pulse wave to Trackpad, the other end at electric capacity can induce an energy of a charge, this electric charge can be stored in via integrator in the electric capacity, relend by the charging potential of amplifier and amplify, deposit in the storer after being converted into digital signal through A/D conversion circuit at last electric capacity; Enter the key scan stage afterwards, it is that the analog/digital output signal of each button on the Trackpad and the signal in the storer are compared, and this button of signal interval scale in being lower than storer has touched arriving.
The shortcoming of the method be the ifs circuit plate in manufacturing process because of the thickness of sheet material when different with Copper Foil or inhomogeneous, can cause the capacitance of the equivalent capacity of each button also can be inhomogeneous, also relatively be easy to generate the error in the comparison.
(2) value that the charging potential of all buttons is averaged the back gained is compared with the charging potential of all buttons, and microcontroller learns that at last which button is pressed:
Store potential value that the potential reference value stage gets the equivalent capacity of all buttons earlier and again it is deposited in the storer after averaging entering, enter the key scan stage afterwards, the potential value and the reference potential value of all button integrating capacitors are compared, represent then that when the button potential value is lower than the reference potential value a button is pressed.
(3) compare individually behind the charging potential record with all buttons, if comparative result is lower than the button potential value of original record, then microcontroller will learn which button is pressed again:
The integrating capacitor potential value of all buttons is all stored under the stage in the storage potential reference value, when entering key scan after the stage, the integrating capacitor potential value of each button of scan is compared with the benchmark integrating capacitor potential value of this button, if scanning button pattern current potential represents that a button is pressed when being lower than benchmark integrating capacitor potential value.
In three kinds of above-mentioned methods, though the space of the employed storer of first and second kind method is very low, the scope of induction and sensitivity meeting are with the increase of the touch controlled key non-constant that becomes; This is different because the equivalent capacity of button can be with the uniformity coefficient of sheet material, thickness of slab and copper minimal thickness on the Trackpad; and make that the uniformity coefficient of equivalent capacity is had a strong impact on; cause current potential that the equivalent capacity of each button fills difference to some extent; so, also be easier to be subjected to the interference of external factor if regular meeting produces the phenomenon of erroneous judgement when comparing with original current potential that writes down.
Though the third method can improve the induction range and the sensitivity of touch control induction device very effectively, if shared space will become many significantly on storer but use when a large amount of buttons (for example: up to a hundred), at the same time if the bit of the analog/digital circuit in the touch control induction device is high more, then its shared storage space then can be bigger, and two additions are taken advantage of makes the processing speed of single unit system slack-off, arithmetic speed reduces.
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 purpose of the present invention improves the processing speed of microcontroller, and significantly promotes the induction range and the sensitivity of touch-control for by obtaining the usage space that the mode that has lowest total of points electric capacity current potential in the matrix in the X-axis line reduces storer.
Main conception of the present invention is when storing potential reference value, points all on every row's X-axis is compared, after getting minimum button potential value after relatively intacter it is deposited in the storer, entering key scan during the stage, with X-axis each row button current potential and this row's potential reference value make comparisons, when potential value be lower than reference value then decidable a button is pressed.
According to main conception of the present invention, a kind of interpretation method of touch control induction device is proposed, the interpretation method of touch control induction device, wherein this touch control induction device comprises a Trackpad (Pad), and this Trackpad is connected in m * n equivalent capacity at least, m is the equivalent capacity number on the X-direction, and n is the equivalent capacity number on the Y direction, and this interpretation method comprises the following steps: that (a) should charge to obtain m digital signal by equivalence electric capacity at wherein the m of row is individual on the X-direction; (b) this m digital signal relatively, and wherein reckling as a potential reference value; (c) repeating step (a)-(b) is with n this potential reference value that obtains all equivalent capacitys; (d) touch this Trackpad; (e) scan this Trackpad, with obtain with respect to the m of at least one row should equivalence electric capacity at least one potential variation value; And (f) relatively this potential reference value and this potential variation value, touched with in should row on this Trackpad of interpretation which point.
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 m * n button, and each this button is connected in an electric capacity, m is the number of keys on the X-direction, n is the number of keys on the Y direction, this interpretation method comprise the following steps: (a) on the X-direction wherein m this electric capacity of row charge to obtain m digital signal; (b) this m digital signal relatively, and wherein reckling as a potential reference value; (c) repeating step (a)-(b) is with n this potential reference value that obtains all electric capacity; (d) touch this Trackpad; (e) scan this Trackpad, to obtain at least one potential variation value with respect to m this electric capacity of at least one row; And (f) relatively this potential reference value and this potential variation value, touched with in should row on this Trackpad of interpretation which point.
The present invention is by following graphic and describe in detail, can obtained more deep understanding:
Description of drawings
Fig. 1 is the structural representation of capacitance touching control induction installation of the present invention;
Fig. 2 is the synoptic diagram of the interpretation method of capacitance touching control induction installation of the present invention.
Embodiment
Principle of the present invention is, at first must deposit on each X-axis the wherein worthwhile potential reference value of doing of the charging potential of a certain button in, the integrating capacitor potential value of this button must be minimum on coaxial, comparison with charging potential that each button is provided, energy of a charge when hand is touched on the button will be attracted by finger, and this moment button charging potential must be lower than the potential reference value of former button, this moment, microcontroller just can judge that button is pressed in the button.
Now structural drawing and the synoptic diagram with the embodiment of the present invention that cooperates Fig. 1 and Fig. 2 explains:
See also Fig. 1, it is for the structural representation of capacitance touching control induction installation of the present invention, as shown in the figure, touch control induction device of the present invention can by a Trackpad (Pad) (being connected in m * n equivalent capacity) or m * n button be constituted wherein, m is the electric capacity on the X-direction or the number of equivalent capacity, and n is the electric capacity on the Y direction or the number of equivalent capacity
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. earlier export one first continuous pulse wave to m electric capacity or equivalent capacity of row wherein by the output terminal of microcontroller.
B. this first pulse wave can induce one first energy by the other end after via the equivalent 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 value can be deposited in the storer.
E. continue scanning after the integrating capacitor current potential of last all buttons of these row (X-axis) all is converted to this first digital signal, it is deposited in the storer.
F. the digital signal that at last same row (X-axis) is gone up all buttons compares, and minimum the staying and depositing in the storer of current potential.
G. 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, in the random access memory of restoring, as potential reference value,, remove this first energy of this button on the integrator at last so that the usefulness of follow up scan each point to be provided.
H. after all depositing in the potential reference value of the electric capacity of each row (X-axis) in the storer (as shown in Figure 2), 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, this stage equally can be via the handling procedure of integrator, operational amplifier and A/D conversion circuit behind each button of scanning, and action is identical to step c with the step a that stores the potential reference value stage at the beginning;
I. earlier export one second continuous pulse wave to m equivalent electric of these row perhaps on the electric capacity by the output terminal of microcontroller.
J. 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.
K. one second waveform of integrator being exported inputs to operational amplifier and amplifies to carry out signal.
L. 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.
M. 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 continuation scanning next column (X-axis), 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 scanning next column (X-axis).
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.
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 this Trackpad is connected in mxn equivalent capacity at least, and m is the equivalent capacity number on the X-direction, n is the equivalent capacity number on the Y direction, and this interpretation method comprises the following steps:
(a) should charge to obtain m digital signal by equivalence electric capacity at wherein the m of row is individual on the X-direction;
(b) this m digital signal relatively, and wherein reckling as a potential reference value;
(c) repeating step (a)-(b) is with n this potential reference value that obtains all equivalent capacitys;
(d) touch this Trackpad;
(e) scan this Trackpad, with obtain with respect to the m of at least one row should equivalence electric capacity at least one potential variation value; And
(f) relatively this potential reference value and this potential variation value, touched with in should row 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 a storer, and step (a) comprises that also step is as follows:
(a1) provide one first pulse wave should make it induce one first energy by equivalence electric capacity to m is individual;
(a2) deposit this first energy in this integrator;
(a3) one first output waveform of this integrator is amplified and be converted into this first digital signal; And
(a4) deposit this first digital signal in this storer, wherein this storer can be a random access memory.
3. interpretation method as claimed in claim 1, it is characterized in that step (b) is that this first digital signal with minimum multiply by a proportional numers to become this potential reference value, and deposit this potential reference value in this storer, wherein this proportional numers 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 first energy in this integrator.
5. interpretation method as claimed in claim 1, it is characterized in that step (d) and (e) between comprise that also step is as follows:
(d1) provide one second pulse wave should make it induce one second energy by equivalence electric capacity to m is individual;
(d2) deposit this second energy in this integrator; And
(d3) 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 each 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; And/or
This touch control induction device comprises this storer and this integrator is to be integrated in the microcontroller.
7. the interpretation method of a touch control induction device, wherein this touch control induction device comprises a Trackpad, and this Trackpad is connected in a plurality of equivalent capacitys at least, this interpretation method comprises the following steps:
(a) should charge to obtain at least one digital signal by equivalence electric capacity at each;
(b) each this digital signal relatively, and wherein reckling as a potential reference value;
(c) touch this Trackpad;
(d) scan this Trackpad, to obtain at least one potential variation value that each should equivalence electric capacity; And
(e) relatively this potential reference value and each this potential variation value, touched with on this Trackpad of interpretation which point.
8. the interpretation method of a touch control induction device, wherein this touch control induction device comprises mxn button, and each this button is connected in an electric capacity, and m is the number of keys on the X-direction, and n is the number of keys on the Y direction, and this interpretation method comprises the following steps:
(a) on the X-direction wherein m this electric capacity of row charge to obtain m digital signal;
(b) this m digital signal relatively, and wherein reckling as a potential reference value;
(c) repeating step (a)-(b) is with n this potential reference value that obtains all electric capacity;
(d) touch this Trackpad;
(e) scan this Trackpad, to obtain at least one potential variation value with respect to m this electric capacity of at least one row; And
(f) relatively this potential reference value and this potential variation value, touched with in should row on this Trackpad of interpretation which point.
9. the interpretation method of a touch control induction device, wherein this touch control induction device comprises at least one button, and each this button is connected in an electric capacity, this interpretation method comprises the following steps:
(a) charge to obtain at least one digital signal at each this electric capacity;
(b) compare each this digital signal, and will it is characterized in that reckling is as a potential reference value;
(c) touch this Trackpad;
(d) scan this Trackpad, to obtain at least one potential variation value of each this electric capacity; And
(e) relatively this potential reference value and each this potential variation value, touched with on this Trackpad of interpretation which point.
10. interpretation method as claimed in claim 9 it is characterized in that this touch control induction device also comprises an integrator and a storer, 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 this first digital signal; And
(a4) deposit this first digital signal in this storer.
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| CNB2004100603912A CN100377055C (en) | 2004-12-22 | 2004-12-22 | Interpretation method for touch controlled induction system |
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| CNB2004100603912A CN100377055C (en) | 2004-12-22 | 2004-12-22 | Interpretation method for touch controlled induction system |
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| CN100377055C CN100377055C (en) | 2008-03-26 |
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