CN101414819A - Sensing method and apparatus for controlling current source and compensating touch control capacitance - Google Patents
Sensing method and apparatus for controlling current source and compensating touch control capacitance Download PDFInfo
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- CN101414819A CN101414819A CNA2007102020870A CN200710202087A CN101414819A CN 101414819 A CN101414819 A CN 101414819A CN A2007102020870 A CNA2007102020870 A CN A2007102020870A CN 200710202087 A CN200710202087 A CN 200710202087A CN 101414819 A CN101414819 A CN 101414819A
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Abstract
The invention relates to a current supply control and compensating touch-control capacitance sensing method and a device thereof. The device is composed of a capacity transducer which is connected with one or more touch-control input points and a sensing capacitor; each touch-control input point is connected with a touch-control capacitor; the method is as follows: clearing electric charges among the sensing capacitors and the touch-control capacitor firstly, then generating a variable current supply to charge the touch-control capacitor, after being charged, the charges of the touch-control capacitor are transferred to be accumulated on the sensing capacitor, thus generating an accumulating voltage (Vs), and counting an enumerated value, that is, N is equal to N plus 1; repeating the steps until the accumulating voltage (Vs) reaches a voltage reference (Vref), and when the enumerated value N is in accordance with the standard, the touch control of the touch-control input point is generated.
Description
Technical field:
The present invention relates to a kind of current source control and compensating touch control capacitance method for sensing and device thereof of utilizing, particularly about a kind of Touch Screen (Touch Screen), slide switch (Slider), matrix switch (Matrix), thumbwheel switch (Wheel) or style of writing screen contactor control devices such as (Pen-Pad) of being applied to, can utilize current source to control and the method and the device thereof of compensating touch control capacitance transducer.
Background technology:
Because the progress of science and technology, the application of touch technology general development for example in the jealous glass panel back of baking box and frying pan, promptly are to adopt the separate type touch controlled key to realize on many home appliances.These touch controlled keys have substituted mechanical key gradually, because the useful life of mechanical key is short, but also relevant cost that must button is installed in perforate on panel.
In addition, Touch Screen has become present most important applications technology, and the touch technology of Touch Screen has electric resistance touch-control and capacitance touching control etc., resistance touch screen swiped and generation can be very fast aging after hanging line, characteristics such as that so the capacitive touch control techniques has is durable, cost is low, and become the one preferred technique of touch-control gradually.
Industry usually has the idea of a mistake; think the capacitive touch control techniques; its human body must ground connection; finger could start touch-control; finger can sensed touch-control be because its surface has electric charge in fact, and therefore the sensing as receiving calls onboard only needs finger to wave gently in 10cm; might not run into, can detect very little capacitance and start touch-control.
Present Touch Screen mostly is multiplex touch control point (Multi-Pad) detecting, promptly simultaneously can detect a plurality of touch points by touch-control, and need the touch point capacitance of detecting usually is very close, and must design corresponding plural groups capacitance sensor and sense capacitance, could calculate in real time and reaction, but so also corresponding raising of design cost of capacity sensor circuit.
As shown in Figure 1, capacitance touching control sensor circuit configuration diagram for known 4 groups of touch points, general touch sensing 1 all is designed to integrated circuit, this touch sensing 1 is connected with the capacitor sensor (Cs1-Cs4) 3 of 4 groups 2 and 4 groups of touch-control input points (D1-D4), and each touch-control input point 2 also all is connected with a touch control capacitance device (Cx1-Cx4) 5, when each touch-control input point 2 of finger touches, this touch control capacitance device 5 all can induce a touch control capacitance value, the capacitance that touch control capacitance device 5 is responded to is transferred on the pairing capacitor sensor 3 again, therefore need constantly touch control capacitance device 5 to be discharged and recharged, so that the quantity of electric charge that shifts touch point capacitor 5 is to capacitor sensor 3, detect the capacitance of capacitor sensor 3 again and judge that whether the touch-control input point is by touch-control, therefore the touch-control input point is many more, and then Zhen Ce speed will be slow more.
In addition, the temperature of external environment condition, humidity and interference source (Noise) also can have influence on the detecting of capacitance sensor to the touch point capacitance.Therefore at known capacitance touching control transducer, for the touch point capacitance of detecting too hour, when the stray capacitance value during detecting is too big, and contiguous multiplex touch control point capacitance is when too close, all be not easy to be detected out, can't touch-control or the problem of false touch control and cause.
So, this case inventor is the disappearance and inconvenience that solves above-mentioned existing capacitance touching control detection technology, be that the spy concentrates on studies and cooperates the utilization of scientific principle, the increase or the minimizing in a kind of Control current source are proposed, so that outside touch point capacitor charging or capacitor sensor discharge in advance to touch sensing, detecting voltage with similar raising or reduction touch control capacitance value, and can quicken detecting to the touch point capacitance, therefore can effectively improve because of the too close situation in environmental interference or multiple contact or capacitance situation too hour.
Summary of the invention:
Technical problem to be solved by this invention is: at above-mentioned the deficiencies in the prior art, a kind of current source control and compensating touch control capacitance method for sensing and device thereof are provided, can solve when requiring to detect touch control capacitance when very little, perhaps under the very big environment of stray capacitance, when the touch control capacitance value of perhaps adjacent touch-control input point is very close, all can detects to distinguish whether to have and produce by finger touch.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of current source control and compensating touch control capacitance method for sensing, formed by one an or above touch-control input point of capacitance sensor connection and a capacitor sensor, each touch-control input point connects a touch control capacitance device again, and this method comprises the following steps: that a. removes the electric charge of this capacitor sensor; B. remove this touch control capacitance device; C. produce a variable current source to this touch control capacitance device charging; D. shift the electric charge on this touch control capacitance device, be accumulate on this capacitor sensor, produce an accumulation voltage; E. count the count value of a N=N+1; F. judge that whether this accumulation voltage reaches a reference voltage, then repeats the b step if not to the f step; And g. judges whether conformance with standard of count value N, represents that promptly this touch-control input point has the touch-control generation if meet.
The present invention realizes current source control and the compensating touch control capacitance sensing apparatus that said method adopts, it comprises that a capacitance sensor connects one an or above touch-control input point and a capacitor sensor, each touch-control input point respectively connects a touch control capacitance device again, be characterized in: comprise in the described capacitance sensor: a control unit, can be by the action of software control associated component; The unit of merit more than, it connects this control unit, is subjected to control arbitrary this touch-control input point of selection of this control unit and the touch control capacitance device of connection thereof; Control of one current source and compensating unit, it connects this control unit and this many merits unit, is subjected to the control of this control unit to produce a variable current source, can be to the selected touch control capacitance device charging in this many merits unit; One electric capacity detecting unit, it connects this control unit, this many merits unit, this current source control and compensating unit and this capacitor sensor, be accumulate on this capacitor sensor in order to the electric charge of transferring on the selected touch control capacitance device in this many merits unit by the control of this control unit, maybe can cooperate this variable current source this capacitor sensor discharge; And the accurate position of electric capacity measuration meter counting unit, it connects this control unit and this capacitor sensor, be subjected to the control of this control unit, transfer electric charge on this touch control capacitance device and be accumulate to number of times on this capacitor sensor, produce to have judged whether finger touch in order to count this electric capacity detecting unit.
For reaching above-mentioned purpose, another technical characterictic of the present invention is to provide above-mentioned current source control and compensating touch control capacitance method for sensing and device thereof, the variable current source system that wherein this current source is controlled and compensating unit produced can be according to requiring, under the very little detecting environment of touch control capacitance value, increase variable current source to this touch control capacitance device charge volume, this touch control capacitance still can be detected.
For reaching above-mentioned purpose, another technical characterictic of the present invention ties up in above-mentioned current source control and compensating touch control capacitance method for sensing and device thereof are provided, the variable current source system that wherein this current source is controlled and compensating unit produced can be according to requiring, under the very big circuit environment of stray capacitance, produce negative variable current source to this capacitor sensor discharge, this stray capacitance that flows away with electric charge, the electric charge that the only remaining touch control capacitance device of this capacitor sensor is transferred.
For reaching above-mentioned purpose, a technical characterictic more of the present invention is to provide above-mentioned current source control and compensating touch control capacitance method for sensing and device thereof, the count value N of the accurate position of this electric capacity measuration meter counting unit wherein, can be according to requiring to increase to the m multiple, resolution with the touch control capacitance value that improves adjacent two touch-control input points when close increases the ability of differentiating.
So, can satisfy under the environmental impact of temperature or humidity, perhaps under the influence of layout, perhaps the specification change still can be detected the existence of finger touch electric capacity down fast.
Description of drawings:
Fig. 1 is the capacitance touching control sensor circuit configuration diagram of known 4 groups of touch points;
The touch sensing circuit framework schematic diagram that Fig. 2 is embodiment for the present invention with 4 groups of touch-control input points;
Fig. 3 is the touch sensing internal simulation calcspar of the embodiment of the invention;
Fig. 4 is the basic action flow chart of the embodiment of the invention;
Fig. 5 solves the in-problem action flow chart of stray capacitance for the present invention; And
Fig. 6 improves the motion flow schematic diagram of accuracy for the present invention.
Label declaration:
1 touch sensing, 2 touch-control input points
3 capacitor sensors, 5 touch control capacitance devices
10 touch control sensing circuits, 11 touch sensings
12 touch-control input points, 13 capacitor sensors
14 touch control capacitance devices, 20 control units
22 current sources control of the unit of merit more than 21 and compensating unit
The accurate position of 23 electric capacity detecting units, 24 electric capacity measuration meter counting unit
Embodiment:
Reach technology, means and the effect that predetermined purpose is taked for further understanding the present invention, see also following about detailed description of the present invention and accompanying drawing, believe purpose of the present invention, feature and characteristics, go deep into and concrete understanding when getting one thus, yet appended graphic reference and the explanation usefulness of only providing not is to be used for the present invention is limited.
See also shown in Figure 2ly, be the present invention's touch sensing circuit framework schematic diagram that is embodiment with 4 groups of touch-control input points.Touch control sensing circuit 10 of the present invention mainly includes at least one touch sensing 11, one or an above touch-control input point 12 and a capacitor sensor 13, embodiment explanation with Fig. 2, this touch sensing 11 is connected with 4 groups of touch-control input points (D1-D4) 12 and a capacitor sensor (Cs) 13, this touch-control input point 12 can be distributed on the Touch Screen or the number Trackpad on, each this touch-control input point 12 also all correspondence be connected with a touch control capacitance device (Cx1-Cx4) 14.
At first be noted that the capacitor-type touch technology be utilize touch-control input point (D1-D4) 12 have when being touched and not being touched with electric charge be different, and accurately this quantity of electric charge is detected out, can judge then that this touch-control input point does not have is touched, but exist owing to having parasitic capacitance arround the touch-control input point, and the capacitance of those parasitic capacitances is big than touch control capacitance device 14 sometimes, so can allow touch sensing 11 detect.
And touch sensing 11 needs the very little touch control capacitance value of detecting sometimes, therefore need very high sensitivity, if but this touch sensing 11 is in a zone that electric charge is very heavy, when needing to detect the very high electric charge of sensitivity again, how to offer an explanation? solution of the present invention is the resolution that increases this touch sensing 11.
For instance, the electric charge of a touch control capacitance device 14 is passed to capacitor sensor 13, need the resolution of 10bit could resolve the little electric charge of detecting, but the hardware cost of 10bitA/D transducer (AnalogtoDigital Converter) is very expensive, but once transfer the method for the little electric charge of 1bit if use tradition, need again to spend the long software detecting time, so how to increase the problem that resolution usually needs to consider hardware cost and software execution speed, therefore the present invention utilizes the control of current source and compensation to solve this problem, utilizing wherein, 4bit is controllable electric current, go to inject touch-control input point 12, so can't consume the time more, also can not influence actual detecting, be described as follows with embodiments of the invention.
See also shown in Figure 3ly, be the touch sensing internal simulation calcspar of the embodiment of the invention.Touch sensing 11 of the present invention is designed to an integrated circuit, but its internal circuit emulation becomes a control unit (Controller) 20, the unit of merit more than (Multiplexer) 21, control of one current source and compensating unit (Current Source for Control andCompensation) 22, one electric capacity detecting unit (Capacitor Detector), 23 and one electric capacity accurate position measuration meter counting unit (CapacitorLevelMeasure Counter) 24, as shown in Figure 2, touch sensing 11 of the present invention except that connect one or more than one touch-control input point 12, and only connect a capacitor sensor 13.
Wherein this control unit 20 connects this many merits unit 21, current source control and the accurate position of compensating unit 22, electric capacity detecting unit 23 and electric capacity measuration meter counting unit 24, it can be by the action of all interlock circuit assemblies of software control, this many merits unit 21 connects those touch-control input points 12, current source control and compensating unit 22 and electric capacity detecting unit 23 again, this current source control and compensating unit 22 are connected to this electric capacity detecting unit 23 again, and the accurate position of this electric capacity detecting unit 23 and electric capacity measuration meter counting unit 24 connects the two ends of this capacitor sensor 13 respectively.
These many merits unit 21 emulation become a multi-function device, can be subjected to these control unit 20 controls to select the touch control capacitance device of arbitrary this touch-control input point and connection thereof, mainly contain two kinds of operate conditions, the first produces variable current source by this current source control and compensating unit 22 arbitrary this touch-control input point 12 is carried out pre-charge, whether it two is to be accumulate on this capacitor sensor 13 by the electric charge that this electric capacity detecting unit 23 shifts on these touch control capacitance devices 14, have touch-control to produce with detecting.
Control of this current source and compensating unit 22 also can be sent to variable current source this electric capacity detecting unit 23 except producing the pre-charge of variable current source to those touch control capacitance devices 14, this sense capacitance 15 is done in advance discharging action.Therefore this electric capacity detecting unit 23 can be by controller 20 controls, transfer on the one hand and accumulate electric charge on this touch control capacitance device 14, can cooperate current source control and compensating unit 22 on the other hand, allow this capacitor sensor 15 do the effect that voltage compensation increases or reduces, cooperate the accurate position of this electric capacity measuration meter counting unit 24 again, count electric charge on this electric capacity detecting unit 23 these touch control capacitance devices 14 of transfer and be accumulate to number of times on this capacitor sensor 13, produce to have judged whether finger touch.
See also Fig. 3 and shown in Figure 4, basic action flow chart for the embodiment of the invention, be the step that initializes at the beginning, it is zero (S401) that this control unit 20 can be removed the accurate position of this electric capacity measuration meter counting unit 24, and the electric charge of this capacitor sensor 13 removed (S402), and the electric charge removing (S403) of touch control capacitance device 14 that will this many merits unit 21 selected these touch-control input points 12.
Then carry out precharge step, this control unit 20 can control this current source control and compensating unit 22 generations one variable current source carries out pre-charge (S404) to the touch control capacitance device 14 of this touch-control input point 12 one by one through this many merits unit 21.
After finishing, charging carries out the transfer accumulation step of touch control capacitance electric charge, this control unit 20 can see through the electric charge that this many merits unit 21 shifts on this touch control capacitance device 14 by this electric capacity detecting unit 23 of control, be accumulate on this capacitor sensor 13 (S405), and revolution moves the accurate position of this electric capacity of an electric charge measuration meter counting unit 24 and can count once, make count value N=N+1 (S406), and judge whether less than a reference voltage (Vref) (S407) accumulation voltage (Vs) that this capacitor sensor 13 accumulated, if this capacitor sensor 13 is because of accumulation voltage (Vs) that stored charge produced, in a set time, reach a reference voltage (Vref), and the count value N of the accurate position of this electric capacity measuration meter counting unit 24 is again during conformance with standard, between 90 to 110, may all represent that finger touches touch-control input point 12 (S408) as this count value N.
If accumulation voltage (Vs) still then judges whether to surpass this set time (S409) earlier less than this reference voltage (Vref), then get back to step S403 if not and continue stored charge, if then the expression finger does not touch touch-control input point 12, and carries out the touch control capacitance detecting of next touch-control input point 12.
For instance, suppose that its touch control capacitance value is 10p when a certain touch-control input point 12 is touched, then this variable current source can produce the elementary charge amount of 1 unit to these touch control capacitance device 14 required chargings, and the time of charging is supposed about 4 μ Sec.If the accumulation voltage (Vs) that these capacitor sensor 13 stored charges are produced reaches reference voltage (Vref) in this set time (supposing 400 μ Sec), and during the count value N conformance with standard (suppose 100 times) of the accurate position of this electric capacity measuration meter counting unit 25, expression finger generation touch-control then.
Then the present invention with the motion flow explanation of three kinds of states with variable current source solve the one touch control capacitance too hour, problem when its two stray capacitance is too big, when its three touch points electric capacity is too close.Suppose that under general environment when finger touches, the touch control capacitance value that this touch control capacitance device 14 is produced is 10p, but in first environment, still can be detected when requiring touch control capacitance value 1p; When in second environment, the touch control capacitance value during this finger touches is 10p, and the stray capacitance of 100p is arranged in the circuit; When in the 3rd environment, requirement can detect at least two close touch-control input points 12 when simultaneously touched, and these two close touch control capacitances all can be differentiated.
In the embodiment of first environment, when requiring finger may leave touch-control input point 10cm when still requirement can be detected, at this moment the touch control capacitance value of this touch-control input point 12 may be 1p, its motion flow is still the same with the elemental motion of figure four, just at every turn when step S404, this variable current source need be spent more 10 times of times of expense to these touch control capacitance device 14 chargings, could produce the elementary charge amount of 1 unit, therefore the present invention can increase this current source control and compensating unit 22 produce can 10 times variable current source to these touch control capacitance device 14 chargings, whether the touch-control input point that so still can judge in the detecting standard of identical time has to declare touches.Under general environment, this mode also can be used aspect the calculating of quickening finger translational speed, in order to quicken detecting whether finger touches is arranged.
In the embodiment of second environment, the electric capacity of touch control capacitance value is 10p, and stray capacitance is the situation of 100p, sees also Fig. 3 and shown in Figure 5, for the present invention solves the in-problem action flow chart of stray capacitance.Similarly be the step that initializes at the beginning, it is zero (S501) that this control unit 20 can be removed the accurate position of this electric capacity measuration meter counting unit 24, and the electric charge of this capacitor sensor 13 removed (S502), and the electric charge removing (S503) of touch control capacitance device 14 that will this many merits unit 21 selected these touch-control input points 12.
Then carry out precharge step, this control unit 20 can be controlled this current source control and compensating unit 22 produces a variable current source through one by one this touch control capacitance device 14 being carried out pre-charge (S504).
Carry out the transfer accumulation step of touch control capacitance electric charge after charging finishes, this control unit 20 can be controlled the electric charge that this electric capacity detecting unit 23 shifts on these touch control capacitance devices 14, is accumulate on this capacitor sensor 13 (S505).But owing to have the 100p stray capacitance to exist in the entire circuit,, the stray capacitance of this 100p can be transferred to simultaneously on this capacitor sensor 13 and cause the mistake detecting therefore if directly the electric charge on this touch control capacitance device 14 is accumulate on this capacitor sensor 13.
Therefore at every turn when shifting touch control capacitance device 14 electric charges, this control unit 20 can be controlled the variable current source of the negative elementary charge amount of this current source control and 10 units of compensating unit 22 generations, see through 13 discharges (S506) of 23 pairs of these capacitor sensors of this electric capacity detecting unit simultaneously, so stray capacitance with electric charge can flow away the electric charge that the touch control capacitance device 14 of the only remaining finger contact of the electric charge of being transferred in this capacitor sensor 13 this moment is transferred earlier.
Revolution moves electric charge one time, the accurate position of this electric capacity measuration meter counting unit 25 can be counted once, make count value N=N+1 (S507), and less than a reference voltage (Vref) (S508) whether the accumulation voltage (Vs) of judging 13 of this capacitor sensors, if accumulation voltage (Vs) is equal to or greater than this reference voltage (Vref), and the count value of the accurate position of this electric capacity measuration meter counting unit 24 is again during conformance with standard, promptly the expression finger touches touch-control input point 12 (S509), if accumulation voltage (Vs) still then judges whether to surpass this set time (S510) earlier less than this reference voltage (Vref), then get back to step S503 if not and continue stored charge, if then the expression finger does not touch touch-control input point 12, and carries out the touch control capacitance detecting of next touch-control input point 12.
Wherein control variable current source except removing the stray capacitance, in the time of need be differentiated touching more accurately at close touch-control input point 12 more than 2, also need to control this capacitor sensor 13 and bleed off electric charge, the electric charge that reaches standard detecting voltage reduces, can provide the count value cumulative frequency of the accurate position of this electric capacity measuration meter counting unit 24 to increase, to reach standard detecting voltage.
Because the voltage (Vs) that these capacitor sensor 13 stored charges are produced is fixed, impossible endless stored charge is on this capacitor sensor 13, but to bleed off this capacitor sensor 13 how many electric charges on earth, and then charging again, these all can be through overwriting and calculating, so use the size of this capacitor sensor 13 also to become more flexible.
When general in addition capacitance touching control is measured, resolution has the phenomenon of successively decreasing gradually, because the electric charge of general capacitor transfer, no matter be serial or parallel connection, institute's stored charge phenomenon less and less all can take place, present the saturated situation of index shape (exponential), at this moment resolution and widely different when just having begun, utilize the present invention to control the detecting mode of variable current source, can write down the quantity of electric charge that this capacitor sensor 13 is bled off, do not have too big difference with what keep resolution, that is the accumulation voltage (Vs) that this sense capacitance is accumulated reaches reference voltage (Vref) value, do not need too high, and because of the discharge very fast, do not influence the operating time fully.
See also Fig. 3 and shown in Figure 6, improve the motion flow schematic diagram of accuracy for the present invention.Similarly be the step that initializes at the beginning, it is zero (S601) that this control unit 20 can be removed the accurate position of this electric capacity measuration meter counting unit 24, and the electric charge of this capacitor sensor 13 removed (S602), and the electric charge removing (S603) of touch control capacitance device 14 that will this selected this touch-control input point 12 in many merits unit.
Then carry out precharge step, this control unit 20 can be controlled this current source control and compensating unit 22 produces a variable current source through one by one this touch control capacitance device 14 being carried out pre-charge (S604).Carry out the transfer accumulation step of touch control capacitance electric charge after charging finishes, this control unit 20 can be controlled the electric charge that this electric capacity detecting unit 23 shifts on these touch control capacitance devices 14, is accumulate on this capacitor sensor 13 (S605).
Revolution moves electric charge one time, the accurate position of this electric capacity measuration meter counting unit 24 can be counted once (S606), and judge whether less than a reference voltage (Vref) (S607) accumulation voltage (Vs) that this capacitor sensor 13 accumulated, if the accumulation voltage (Vs) that these capacitor sensor 13 stored charges are produced, in the set time, reach this reference voltage (Vref), and during conformance with standard, promptly the expression finger touches touch-control input point 12 (S608) to the count value of the accurate position of this electric capacity measuration meter counting unit 24 again.
The number of times that increases these capacitor sensor 13 stored charges for the present invention of raising resolution is m times, therefore if accumulation voltage (Vs) still earlier judges then less than reference voltage (Vref) whether the count value N of the accurate position of this electric capacity measuration meter counting unit 24 is the multiple (S609) of m, then gets back to step S603 if not and continues stored charge.If N is the multiple of m, then this control unit 20 can be controlled the variable current source of this current source control and compensating unit 22 generations one negative elementary charge amount, see through 13 discharges (S610) of 23 pairs of these capacitor sensors of this electric capacity detecting unit, and the quantity of electric charge of record discharge, return step S603 stored charge again.
Illustrate, when supposing that two adjacent touch-control input points 12 are touched, one is 10p, and another is 9.5p, cause bad resolution because capacitance is close, with regard to the touch point of 10p, suppose that variable current source produces the elementary charge amount of 1 unit, the m parameter is 25, and N is that the multiple of m is 25,50,75,100,125,150 or the like, and this current source control and variable current source that compensating unit produces are the elementary charge amount of 10 negative units, when so N is the m multiple each time, the elementary charge amount of 10 units that can discharge, so 10p has the quantity of electric charge of 1000 units when supposing originally to count 100 times (N=100), again because of the quantity of electric charge of 500 units that run off through 5 times discharge, be 1500 unit charge amounts altogether, when the accumulation voltage of being accumulated when capacitor sensor 13 (Vs) surpassed this reference voltage (Vref) at last, this N value was 1500/10=150.
With regard to the touch point of 9.5p, when counting 100 times (N=100) equally, the quantity of electric charge that 1000 units are arranged, but 9.5p is the quantity of electric charge of meeting through 600 units of discharge loss of 6 times, be 1600 elementary charge amounts altogether, when the accumulation voltage (Vs) of this capacitor sensor 13 surpasses this reference voltage (Vref) at last, this N value is 1600/9.5=169, so 12 stored counts values of two touch-control input points are 150 and 169, gap is 19, originally be 100 and 106, gap is 6, and therefore increasing the stored charge number of times is to improve resolution, makes the capacitance phase time of adjacent touch-control input point, hold very much and distinguish, so the present invention utilizes the method for control variable current source to control the discharge of capacitor sensor 13 electric charges, except removing the stray capacitance, adjacent touch-control input point is because capacitance is close, and when causing bad resolution, just can increase the ability of resolution.
At last, the present invention utilizes variable current source control and building-out capacitor method for sensing, for speed calculation also is helpful, because the multiplex touch control input point usually needs to detect mobile speed, remove to measure electric capacity if all use known high resolution method, and go to understand mobile speed and direction from the variation of capacitance, really lose time very much, the present invention can increase the charging that variable current source injects 12 pairs of touch control capacitance devices 14 of touch-control input point, to reduce the accumulative total N value of the accurate position of this electric capacity measuration meter counting unit 24, estimate capacitance with heterodyne method, just can know mobile speed and direction, for example point linearly when mobile,, utilize heterodyne method just can estimate mobile speed and method as long as when detecting any 2 touch points, and needn't detect the capacitance that calculates each touch control capacitance device one by one, so can save unnecessary computing time, the speed of CPU also can reduce, and relatively power saving.
Duty is that the present invention is the above-mentioned technology that discloses of energy mat really, and the capacitance sensing method and the device of a kind of current source control and compensation is provided, can satisfy under the environmental impact of temperature or humidity, perhaps under the influence of layout, perhaps the specification change still can be detected the existence of finger touch electric capacity down fast.
Claims (13)
- [claim 1] a kind of current source control and compensating touch control capacitance method for sensing, formed by one an or above touch-control input point of capacitance sensor connection and a capacitor sensor, each touch-control input point connects a touch control capacitance device again, it is characterized in that: this method comprises the following steps:A. remove the electric charge of this capacitor sensor;B. remove this touch control capacitance device;C. produce a variable current source to this touch control capacitance device charging;D. shift the electric charge on this touch control capacitance device, be accumulate on this capacitor sensor, produce an accumulation voltage;E. count the count value of a N=N+1;F. judge that whether this accumulation voltage reaches a reference voltage, then repeats the b step if not to the f step; AndG. judge whether conformance with standard of count value N, represent that promptly this touch-control input point has touch-control to produce if meet.
- [claim 2] current source control as claimed in claim 1 and compensating touch control capacitance method for sensing is characterized in that: more comprise before the described a step:Removing this count value N is 0; And this touch control capacitance device of selecting arbitrary this touch-control input point and being connected.
- [claim 3] current source control as claimed in claim 1 and compensating touch control capacitance method for sensing, it is characterized in that: in the described f step, judge that accumulation voltage reaches reference voltage and ties up in the set time and finish, represent that then this touch-control input point control do not have touch-control and produce if surpass this set time, carry out the detecting of other touch-control input point.
- [claim 4] current source control as claimed in claim 1 and compensating touch control capacitance method for sensing, it is characterized in that: in the described g step, judge count value N if do not meet standard, represent that then this touch-control input point control do not have touch-control and produce, carry out the detecting of other touch-control input point.
- [claim 5] current source control as claimed in claim 1 and compensating touch control capacitance method for sensing, it is characterized in that: in the described c step, producing variable current source can be according to requiring under the very little detecting environment of touch control capacitance value, or accelerate the finger translational speed and calculate, increase variable current source to this touch control capacitance device charge volume, this touch control capacitance still can be detected, or add and detect.
- [claim 6] current source control as claimed in claim 1 and compensating touch control capacitance method for sensing, it is characterized in that: more comprise the following steps: to produce a negative variable current source in the described d step this capacitor sensor is discharged, make under the very big environment of stray capacitance, this stray capacitance that flows away with electric charge, the electric charge that only remaining this touch control capacitance device of this capacitor sensor is transferred.
- [claim 7] current source control as claimed in claim 1 and compensating touch control capacitance method for sensing is characterized in that: more comprise the following steps: after the described f stepJudge whether this count value N meets a m multiple, if do not meet the m multiple, then repeat the b step, when count value N meets the m multiple to the f step;Produce a negative variable current source to this capacitor sensor discharge, with on this capacitor sensor that flows away with electric charge, and behind the quantity of electric charge of record discharge, repeat the b step again to the f step.
- [claim 8] a kind of current source control and compensating touch control capacitance sensing apparatus of realizing the described method of claim 1, it comprises that a capacitance sensor connects one an or above touch-control input point and a capacitor sensor, each touch-control input point respectively connects a touch control capacitance device again, it is characterized in that: comprise in the described capacitance sensor:One control unit can be by the action of software control associated component;The unit of merit more than, it connects this control unit, is subjected to control arbitrary this touch-control input point of selection of this control unit and the touch control capacitance device of connection thereof;Control of one current source and compensating unit, it connects this control unit and this many merits unit, is subjected to the control of this control unit to produce a variable current source, can be to the selected touch control capacitance device charging in this many merits unit;One electric capacity detecting unit, it connects this control unit, this many merits unit, this current source control and compensating unit and this capacitor sensor, be accumulate on this capacitor sensor in order to the electric charge of transferring on the selected touch control capacitance device in this many merits unit by the control of this control unit, maybe can cooperate this variable current source this capacitor sensor discharge; AndThe accurate position of one electric capacity measuration meter counting unit, it connects this control unit and this capacitor sensor, be subjected to the control of this control unit, transfer electric charge on this touch control capacitance device and be accumulate to number of times on this capacitor sensor, produce to have judged whether finger touch in order to count this electric capacity detecting unit.
- [claim 9] current source control as claimed in claim 8 and compensating touch control capacitance sensing apparatus, it is characterized in that: described capacitance sensor is designed to an integrated circuit.[claim 10] current source control as claimed in claim 8 and compensating touch control capacitance sensing apparatus, it is characterized in that: the count value of the accurate position of described electric capacity measuration meter counting unit, be when in a set time, reaching a reference voltage according to the accumulation voltage that this capacitor sensor is accumulated this touch control capacitance device electric charge, when this count value met a standard again, promptly judging had finger touch to produce.
- [claim 11] current source control as claimed in claim 10 and compensating touch control capacitance sensing apparatus, it is characterized in that: described accumulation voltage is surpassing this set time during still less than this reference voltage, then the expression finger does not touch the touch-control input point, and carries out the touch control capacitance detecting of other touch-control input point.
- [claim 12] current source control as claimed in claim 8 and compensating touch control capacitance sensing apparatus, it is characterized in that: described current source control and the variable current source that compensating unit produced can be according to requiring, under the very little detecting environment of touch control capacitance value, or accelerate the finger translational speed and calculate, increase variable current source to this touch control capacitance device charge volume, this touch control capacitance still can be detected, or quicken to detect.
- [claim 13] current source control as claimed in claim 8 and compensating touch control capacitance sensing apparatus, it is characterized in that: described current source control and the variable current source that compensating unit produced can be according to requiring, under the very big circuit environment of stray capacitance, produce negative variable current source to this capacitor sensor discharge, this stray capacitance that flows away with electric charge, the electric charge that the only remaining touch control capacitance device of this capacitor sensor is transferred.
- [claim 14] current source control as claimed in claim 8 and compensating touch control capacitance sensing apparatus, it is characterized in that: the count value N of the accurate position of described electric capacity measuration meter counting unit, can be according to requiring to increase to the m multiple, the resolution with the touch control capacitance value that improves adjacent two touch-control input points when close.
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| CN2007102020870A CN101414819B (en) | 2007-10-16 | 2007-10-16 | Sensing method and apparatus for controlling current source and compensating touch control capacitance |
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