CN101393501A - Apparatus and method for judging contact position on touch control screen of capacitance touching control panel - Google Patents
Apparatus and method for judging contact position on touch control screen of capacitance touching control panel Download PDFInfo
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- CN101393501A CN101393501A CNA2007101542924A CN200710154292A CN101393501A CN 101393501 A CN101393501 A CN 101393501A CN A2007101542924 A CNA2007101542924 A CN A2007101542924A CN 200710154292 A CN200710154292 A CN 200710154292A CN 101393501 A CN101393501 A CN 101393501A
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Abstract
The invention relates to a device and a method for determining the position of a contact on a touch screen of a capacitance-type touch panel. The method comprises the following steps: an alternating-current scanning signal with a frequency is respectively arranged on four corners of the touch screen; the frequencies of corresponding alternating-current signals on the four corners are quickly switched respectively between a group of specific frequencies; the touch screen is respectively driven to correspond to the scanning signal and to sense current values of corresponding specific frequency groups on the four corners; the current values of the corresponding specific frequency groups are received respectively, and a group of selected frequencies are selected from the corresponding specific frequency groups on the four corners according to a noise dump program; the current values corresponding to frequencies in the corresponding specific frequency groups on the four corners are calculated respectively, so as to obtain the final current value; and a coordinate of the contact inputted on the touch screen is calculated according to the corresponding final current values on the four corners respectively.
Description
Technical field
The present invention relates to the field of contact panel, more especially about a kind of decision maker and method of judging the contact position on touch control screen of capacitance type touch-control panel.
Background technology
Traditionally, the input of electronic installation is with keyboard and mouse for it, and can not be with human intuitive manner for it.Afterwards, contact panel is gradually led and is used for all kinds of big compact electronic devices, the user is able to hand or pointer and touches the mode of the screen on it and carry out the contact input, and the position of the set sensing device senses contact input in screen below this moment is with the purpose of the operation of reaching the touch-control electronic device.Sensing mechanism with the input of sensing contact is divided, and contact panel can be categorized as contact panels such as resistance-type, condenser type, surface acoustic wave (SAW) formula and infrared ray (IR) formula.
Capacitance type touch-control panel based on capacitive touch control sensing mechanism is an example, its by sensing one contact input position each side electric current and determine the position that this contact is imported by the mutual relationship of described electric current.See also Fig. 1, it is the explanation synoptic diagram of the contact input position sensing of a capacitance type touch-control panel.As shown in the figure, one capacitance type touch-control panel 10 comprises a Touch Screen 11, this Touch Screen 11 logically comprises A, B, C and D district, and this A, B, the division in C and D district is as a sphere of movements for the elephants shape, and be coupled with an identical ac sweep signal AC1 respectively, AC2, AC3 and AC4, this moment is by this four scanning signal of sensing AC1, AC2, the size of current I1 of AC3 and AC4, I2, I3 and I4 can calculate the coordinate position (X of this input contact P, Y), this four electric current I 1 wherein, I2, the size of I3 and I4 because of input dissimilate former of contact P because input contact (as user's finger) P for can conduction person, it will change its position (X on the Touch Screen 11, Y) impedance of locating, and transverse axis coordinate X and the ordinate of orthogonal axes Y and the described electric current I 1 of being somebody's turn to do input contact P, I2, the relation of I3 and I4 is respectively:
Wherein Δ Ii (i=1,2,3 and 4) is the difference of the electric current I i before the electric current I i of contact P after being transfused to and the input.
Yet, Touch Screen 11 is different usually with the ground reference of user position, so user's finger can be with grass to Touch Screen 11, and the surrounding environment of Touch Screen 11 also may be brought noise into, electromagnetic radiation as LCD screen or cathode ray tube screen promptly constitutes a noise, so the contact input position that single sensing in this way gets often has error.
Therefore, the various technology that noise is removed are just proposed successively, can effectively make the judgement of contact position because of noise error not arranged with the Ji.
Summary of the invention
In view of the demand, the objective of the invention is to overcome the deficiencies in the prior art and defective, a kind of device and method of judging the contact position on touch control screen of capacitance type touch-control panel is proposed, with the position of more accurate judgement input contact.
For reaching above-mentioned purpose, the invention provides a kind of device of judging the contact position on touch control screen of capacitance type touch-control panel, it comprises a signal provides the selected unit of unit, a frequency switch unit, a driven and current sensing unit, an effective frequency, a watt current value to choose a unit and a position coordinates computing unit, and this signal provides the unit in order to four corners that this Touch Screen the is provided ac sweep signal with a tool one frequency; This frequency switch unit in order to the frequency of the frequencies of corresponding alternating-current signals of this four corner of quick switching between one group of characteristic frequency; This driven and current sensing unit scan signal in order to drive this Touch Screen respectively with this correspondence, and the current value of the correspondence group characteristic frequency of this four corner of difference sensing; The selected unit of this effective frequency is in order to the current value of the corresponding specific bin that receives this four corner respectively, and respectively each of the current value of the corresponding specific bin of this four corner selected one group of selected frequency according to a noise filtering program; This watt current value is chosen the unit in order to divide the current value to the frequency correspondence in the selected group of frequencies of the correspondence of this four corner of computing, to obtain a ultimate current value; This position coordinates computing unit is in order to calculate the coordinate of this contact input on this Touch Screen according to the ultimate current value of this four corners correspondence respectively.
In a preferred embodiment, this noise filtering program comprises the following step: judge the frequency of the tool of one or many corresponding current value in the specific bin of this four corners correspondence than great fluctuation process amount person, with as one or treat rejection frequency more; And one in the specific bin of this four corners correspondence of filtering or treat rejection frequency respectively, with as the selected frequency of this group; more And this calculation step is the step of the current value of the frequency correspondence in the selected frequency of this group of an addition.
In a preferred embodiment, this noise filtering program comprises the following step: judge one or many noise frequencies that surrounding environment and user cause four corners of this Touch Screen respectively, by the mode of the undulate quantity of the formed current value of frequency in the specific bin of this four corners correspondence of sensing for it; And respectively in the specific bin of this four corners correspondence of filtering be same as this one or the frequency of many noise frequencies, select frequency and this group characteristic frequency to organize, and this calculation step is the step of the current value of the frequency correspondence in the selected frequency of this group of an addition as this; And this noise filtering program only is performed a specific opportunity.
In a preferred embodiment, this noise filtering program comprises the following step: the undulate quantity of the formed current value of frequency in the specific bin of this four corners correspondence of difference sensing; Reach the respective frequencies of the tool one minimal ripple amount of current value corresponding in the specific bin of choosing this four corners correspondence respectively, and organize characteristic frequency with the frequency of this tool minimum current undulate quantity as the selected frequency of this group and this respectively.In addition, this calculation step is the step of the current value of the frequency correspondence in the selected frequency of this group of an addition, and this noise filtering program only is performed a specific opportunity.
The method of the contact position on touch control screen of judgement capacitance type touch-control panel of the present invention comprises the following step: the ac sweep signal of four corners of this Touch Screen with a tool one frequency is provided respectively; The frequency of the frequencies of corresponding alternating-current signals of quick respectively this four corner of switching is between one group of characteristic frequency; The current value of the correspondence group characteristic frequency of this four corner of difference sensing; Receive the current value of the corresponding specific bin of this four corner respectively, and respectively each of the current value of the corresponding specific bin of this four corner is selected one group of selected frequency according to a noise filtering program; Respectively to the current value of the frequency correspondence in the selected group of frequencies of the correspondence of this four corner in addition computing obtain a ultimate current value; And calculate the coordinate of this contact input on this Touch Screen according to the ultimate current value of this four corners correspondence respectively.
In a preferred embodiment, this noise filtering program comprises the following step: judge the frequency of the tool of one or many corresponding current value in the specific bin of this four corners correspondence than the great fluctuation process amount, with as one or treat rejection frequency more; And one in the specific bin of this four corners correspondence of filtering or treat rejection frequency respectively, with as the selected frequency of this group. moreIn addition, this calculation step is the step of the current value of the frequency correspondence in the selected frequency of this group of an addition.
In a preferred embodiment, this noise filtering program comprises the following step: judge one or many noise frequencies that surrounding environment and user cause four corners of this Touch Screen respectively, by the mode of the undulate quantity of the formed current value of frequency in the specific bin of this four corners correspondence of sensing for it; And respectively in the specific bin of this four corners correspondence of filtering be same as this one or the frequency of many noise frequencies, with as the selected frequency of this group and this group characteristic frequency.In addition, this calculation step is the step of the current value of the frequency correspondence in the selected frequency of this group of an addition, and this noise filtering program only is performed a specific opportunity.
In a preferred embodiment, this noise filtering program comprises the following step: the undulate quantity of the formed current value of frequency in the specific bin of this four corners correspondence of difference sensing; Reach the respective frequencies of the tool one minimal ripple amount of current value corresponding in the specific bin of choosing this four corners correspondence respectively, and organize characteristic frequency with the frequency of this tool minimum current undulate quantity as the selected frequency of this group and this respectively.In addition, this calculation step is the step of the current value of the frequency correspondence in the selected frequency of this group of an addition, and this noise filtering program only is performed a specific opportunity.
The application of the invention is because the judgement of the contact position of Touch Screen is subjected to The noise lower on the capacitance type touch-control panel, so foot can improve the not good shortcoming of contact position judgement in the prior art.
Description of drawings
Fig. 1 is the explanation synoptic diagram of a conventional contact position decision method of capacitance touch control screen;
Fig. 2 is the basic explanation synoptic diagram of the contact position resolution principle of capacitance touch control screen of the present invention;
Fig. 3 is the explanation synoptic diagram of first embodiment of the contact position resolution principle of capacitance touch control screen of the present invention;
Fig. 4 is the explanation synoptic diagram of second and three embodiment of the contact position resolution principle of capacitance touch control screen of the present invention;
Fig. 5 is the basic flow sheet of the contact position decision method of capacitance touch control screen of the present invention;
Fig. 5 A to Fig. 5 C is the preferred embodiment process flow diagram of method shown in Figure 5;
Fig. 6 is the calcspar of the contact position decision maker of capacitance touch control screen of the present invention.
Symbol description among the figure
10 capacitance type touch-control panels, 11 Touch Screens
20 capacitance type touch-control panels, 21 Touch Screens
S501 step 501 S502 step 502
S503 step 503 S504 step 504
S505 step 505 S506 step 506
S511 step 511 S512 step 512
S521 step 521 S522 step 522
S531 step 531 S532 step 532
62 frequency switch units, 63 driven and current sensing unit
64 noise frequencies remove unit 65 watt current values and choose the unit
66 position coordinates computing units
Embodiment
The present invention is a kind of device and method of judging the contact position on touch control screen of capacitance type touch-control panel, and it will cooperate appended graphic being described in detail as follows by preferred embodiment.
Figure 2 shows that the ultimate principle explanation synoptic diagram of the contact position on touch control screen of reduction capacitance type touch-control panel of the present invention.As shown in the figure, one capacitance type touch-control panel 20 comprises a Touch Screen 21, this Touch Screen 21 logically comprises A, B, C and D district, and the picture in this A, B, C and D district divides as same sphere of movements for the elephants shape, and add identical AC system scanning signal AC1, AC2, AC3 and an AC4 at four corners of Touch Screen 21 respectively, with the position of the input contact P of sensing on Touch Screen 21, wherein said scanning signal AC1, AC2, AC3 and AC4 can be square wave or string ripple etc.At this moment, by current value I 1, I2, I3 and the I4 on this four scanning signal of sensing AC1, AC2, AC3 and the AC4, coordinate position (the X of this input contact P, Y) can be calculated, wherein the size of this four electric current I 1, I2, I3 and I4 because of input dissimilate former of contact P because input contact (as user's finger) P for can conduction person, it will change its position (X on the Touch Screen 11, Y) impedance of locating, and the relation of the transverse axis coordinate X of this input contact P and ordinate of orthogonal axes Y and described electric current I 1, I2, I3 and I4 is respectively:
Wherein Δ Ii (i=1,2,3 and 4) is the difference of the electric current I i before the electric current I i of contact P after being transfused to and the input.
For the noise effect of following that makes contact P when input effectively reduces, with unlikely with last P position, input contact (X, Y) erroneous judgement that does wrong is disconnected, this four AC signal I1 of the present invention, I2, I3 and I4 be provided respectively n frequency f 1, f2, f3 ..., fi ..., and fn, with switched in continuously this n frequency f 1, f2, f3 ..., fi ..., and fn between, its explanation synoptic diagram as shown in Figure 3.
In Fig. 3, label f1, f2, f3 ..., fi ..., and fn be variant frequency, and a signal is arranged respectively thereafter, be corresponding described frequency f 1, f2, f3 ..., fi ..., and one of scanning signal AC1, AC2, AC3 and AC4 of fn.In the figure, the scanning signal of frequency f 1 (being assumed to be scanning signal AC1) is gone up observed as may to exist by some noise, observed as to have big noise to exist on the scanning signal of frequency f i, then several muting existence of other frequency f 2 and f3, expression has the noise of frequency f 1 and fi to exist at present on this Touch Screen, and the noise of fi frequency is especially big.Because various noises all belong to narrow frequency signal,, this noise frequency that scans signal AC1, AC2, AC3 and AC4 is removed in addition filtering of the person that has the noise in can current value I 1, I2, I3 and I4 with correspondence so have in a certain frequency at definite noise.
In first embodiment, the noise of frequency f i is added filtering, or can be simultaneously the noise of frequency f 1 be also added filtering, and end is decided according to the threshold value of a filtering, and this threshold value is determined by the deviser.At this moment, to each frequency f 1, f2, f3 ..., fi ..., and the fi of fn or f1 and fi in addition average with the formed current value I of the scanning signal AC1 of epigenesist 1, with electric current I 1, be of the influence of the noise of fi to the current value I 1 of equation (1) to reduce frequency as equation (1).Similarly, other scanning signal AC2, AC3 and AC4 also described frequency f 1, f2, f3 ..., fi ..., and fn between switch fast, its explanation and scanning signal AC1 person with.
In second embodiment as shown in Figure 4, frequency is that scanning signal AC1, AC2, AC3 and the AC4 of f1 and fi or fi is transfused to the back promptly earlier by filtering in one first contact on specific opportunity, and its scanning signal AC1, AC2, AC3 and AC4 no longer are switched to this frequency f i for follow-up input contact.Compare with first embodiment, present embodiment is effectively shortened required sweep time when judging contact position.See also Fig. 4, it is the explanation synoptic diagram in order to the explanation present embodiment, and is the signal size figure in the exhibition frequently.As shown in the figure, when first contact on a specific opportunity is input on the Touch Screen, the frequency of scanning signal (is example with AC1) for f1, f2, f3 ..., fi ..., and the current amplitude difference during fn, this noise (promptly on corresponding current I1 fluctuation being arranged) of promptly representing different frequency has appeared on the Touch Screen, the existence of little and big noise is respectively arranged on frequency f 1 and the fi as shown in Figure 4, and this is the noise that user and surrounding environment cause.Because the addition of user and ambient noise is measured, thus can on Touch Screen, occur the scanning signal AC1 of noise (frequency is fi or fi and f1) taken out and do not appear at f1, f2, f3 ..., fi ..., and the scanning signal AC1 of fn group of frequencies correspondence in.At this moment, when follow-up input contact appears on the Touch Screen, just there is not the existence of frequency f i in the sweep frequency of scanning signal AC1 correspondence, so can shorten the scanning required time that is scanned of signal AC1, certainly this technology also is used for other scanning signal AC2, AC3 and AC4 simultaneously, and its explanation with to the explanation of scanning signal AC1 with.
In the 3rd embodiment, its design is identical with the principle of second embodiment, but the chosen of scanning signal AC1 only is the tool minimal ripple person of a corresponding current value I1 with frequency, so it judges that contact position further is shortened required sweep time, the explanation of other scanning signal AC2, AC3 and AC4 also together.
Can be above-mentioned specific opportunity capacitance touch control screen be mounted in, capacitance touch control screen by in being started shooting, and a task on capacitance touch control screen carry out in the beginning.In addition, described frequency f 1, f2, f3 ..., fi ..., and the switch speed of fn be any, and described frequency f 1, f2, f3 ..., fi ..., and fn all smaller or equal to 200kHz.
In this way for it, because of current value 11, I2, I3 and I4 can reflect the true correspondence of importing the contact to flow valuve, so last possible contact P input position misjudgement degree can be lowered.
The method of the contact position on touch control screen of reduction capacitance type touch-control panel of the present invention has illustrated as above, and has been organized simultaneously in a process flow diagram, as shown in Figure 5.
See also Fig. 5, when the method for the contact position on touch control screen that carries out reduction capacitance type touch-control panel of the present invention, provide the ac sweep signal of four corners of this Touch Screen at first respectively with a tool one frequency; (S501).Then, the frequency of the frequencies of corresponding alternating-current signals of quick respectively this four corner of switching is between one group of characteristic frequency; (S502)., respectively drive this Touch Screen scanning signal with this correspondence thereafter, and the current value (S503) of the correspondence group characteristic frequency of this four corner of difference sensing.Then, receive the current value of the corresponding specific bin of this four corner respectively, and respectively the corresponding specific bin of this four corner is selected one group of selected frequency (S504) according to a noise filtering program.Continue it, the correspondence of this four corner of computing is selected the current value of the frequency correspondence in the group of frequencies respectively, to obtain a ultimate current value (S505).Then, calculate the coordinate (S506) of this contact input on this Touch Screen according to the ultimate current value of this four corners correspondence respectively.
In first preferred embodiment of this method (shown in Fig. 5 A), this noise filtering program comprises the following step: judge the frequency of the tool of one or many corresponding current value in the specific bin of this four corners correspondence than the great fluctuation process amount, with as one or treat rejection frequency (S511) more; And one in the specific bin of this four corners correspondence of filtering or treat rejection frequency respectively, with as the selected frequency (S512) of this group. moreIn addition, step S505 is the step (not shown) of the current value of the frequency correspondence in the selected frequency of this group of an addition.
In second preferred embodiment of this method (shown in Fig. 5 B), this noise filtering program comprises the following step: judge one or many noise frequencies that surrounding environment and user cause four corners of this Touch Screen respectively, by the mode of the undulate quantity of the formed current value of frequency in the specific bin of this four corners correspondence of sensing (S521) for it; And respectively in the specific bin of this four corners correspondence of filtering be same as this one or the frequency of many noise frequencies, with as the selected frequency of this group and this group characteristic frequency (S522).In addition, step S505 is the step (not shown) of the current value of the frequency correspondence in the selected frequency of this group of an addition, and this noise filtering program only is performed a specific opportunity.
In the 3rd embodiment of this method (shown in Fig. 5 C), the undulate quantity (S531) of the formed current value of frequency in the specific bin of this four corners correspondence of difference sensing; Reach the tool one minimal ripple amount person's of current value corresponding in the specific bin of choosing this four corners correspondence respectively respective frequencies, and organize characteristic frequency (S532) with the frequency of this tool minimum current undulate quantity as the selected frequency of this group and this respectively.In addition, step S505 is the calculation step (not shown) of the current value of the frequency correspondence in the selected frequency of this group of an addition, and wherein this noise filtering program only is performed a specific opportunity.
Below will cooperate Fig. 6 to introduce the device of the contact position on touch control screen of reduction capacitance type touch-control panel of the present invention, it also can be used as the platform that above-mentioned method is performed.
See also Fig. 6, the device 60 of the contact position on touch control screen of reduction capacitance type touch-control panel of the present invention comprises a signal provides unit 61, a frequency switch unit 62, a driven and current sensing unit 63, the selected unit 64 of an effective frequency, a watt current value to choose a unit 65 and a position coordinates computing unit 66.
This signal provides unit 61 in order to four corners that this Touch Screen is provided the respectively ac sweep signal with a tool one frequency.
This frequency switch unit 62 scans the frequency of signal between one group of characteristic frequency in order to the correspondence of switching this four corner respectively fast.
This driven and current sensing unit 63 be in order to driving this Touch Screen respectively with this correspondence scanning signal, and in order to the current value of the correspondence group characteristic frequency of this four corner of sensing respectively.
The selected unit 64 of this effective frequency is in order to the current value of the corresponding specific bin that receives this four corner respectively, and respectively the corresponding specific bin of this four corner selected one group of selected frequency according to a noise filtering program.
This watt current value is chosen the current value of unit 65 in order to the corresponding specific bin that receives this four corner respectively, and choose a current value from each of the current value of the corresponding specific bin of this four corner according to a particular procedure mode respectively, with as a ultimate current value.
This position coordinates computing unit 66 is in order to calculate the coordinate of this contact input on this Touch Screen according to the ultimate current value of this four corners correspondence.
The device and method of the application of the invention, contact input noise and ambient noise effect on the Touch Screen of capacitance type touch-control panel are lowered really, so the correct judgment of contact input is enhanced, are enough to improve the shortcoming of prior art.
The present invention by the specific embodiment explanation as above, those skilled in the art can derive out other possibility embodiment by the principle of described embodiment, the embodiment that so derives out all belongs to spiritual scope of the present invention, so actual range of the present invention is when the scope definition by claims.
Claims (14)
1. a device of judging the contact position on touch control screen of capacitance type touch-control panel is characterized in that, comprises:
One signal provides the unit, in order to four corners that this Touch Screen the is provided ac sweep signal with a tool one frequency;
One frequency switch unit, in order to the frequency of the frequencies of corresponding alternating-current signals of this four corner of quick switching between one group of characteristic frequency;
One driven and current sensing unit drive this Touch Screen in order to utilize this frequencies of corresponding alternating-current signals respectively, and the corresponding current value of the correspondence group characteristic frequency of this four corner of sensing;
One effective frequency is selected the unit, in order to the current value of the corresponding specific bin that receives this four corner respectively, and respectively the corresponding specific bin of this four corner is selected one group of selected frequency according to a noise filtering program;
One watt current value is chosen the unit, in order to the current value of the frequency correspondence in the selected group of frequencies of correspondence of this four corner of difference computing, to obtain a ultimate current value; And
One position coordinates computing unit is in order to calculate the coordinate of this contact position on this Touch Screen according to the ultimate current value of this four corners correspondence respectively.
2. the device of the contact position on touch control screen of judgement capacitance type touch-control panel as claimed in claim 1 is characterized in that, described noise filtering program comprises the following step:
Judge the frequency of the tool of one or many corresponding current value in the specific bin of this four corners correspondence, with as one or treat rejection frequency than the great fluctuation process amount more; And
In the specific bin of this four corners correspondence of filtering one or treat rejection frequency respectively with as the selected frequency of this group more; And
This calculation step is the step of the current value of the frequency correspondence in the selected frequency of this group of an addition.
3. the device of the contact position on touch control screen of judgement capacitance type touch-control panel as claimed in claim 1 is characterized in that, described noise filtering program comprises the following step:
Judge one or many noise frequencies that surrounding environment and user cause four corners of this Touch Screen respectively, for it by the mode of the undulate quantity of the formed current value of frequency in the specific bin of this four corners correspondence of sensing; And
Respectively in the specific bin of this four corners correspondence of filtering be same as this one or the frequency of many noise frequencies, with as the selected frequency of this group and this group characteristic frequency, and
This calculation step is the step of the current value of the frequency correspondence in the selected frequency of this group of an addition; And
This noise filtering program only is performed a specific opportunity.
4. the device of the contact position on touch control screen of judgement capacitance type touch-control panel as claimed in claim 3, it is characterized in that be one of following opportunity described specific opportunity: in this capacitance touch control screen is mounted, this capacitance touch control screen is by in starting shooting, and in a particular job task on capacitance touch control screen begins.
5. the device of the contact position on touch control screen of judgement capacitance type touch-control panel as claimed in claim 1 is characterized in that, described noise filtering program comprises the following step:
The undulate quantity of the formed current value of frequency in the specific bin of this four corners correspondence of difference sensing; And
Choose the respective frequencies of the tool one minimal ripple amount of current value corresponding in the specific bin of this four corners correspondence respectively, and organize characteristic frequency with the frequency of this tool minimum current undulate quantity as the selected frequency of this group and this respectively, and
This calculation step is the step of the current value of the frequency correspondence in the selected frequency of this group of an addition; And
This noise filtering program only is performed a specific opportunity.
6. the device of the contact position on touch control screen of judgement capacitance type touch-control panel as claimed in claim 5, it is characterized in that be one of following opportunity described specific opportunity: in this capacitance touch control screen is mounted, this capacitance touch control screen is by in starting shooting, and in a particular job task on capacitance touch control screen begins.
7. the device of the contact position on touch control screen of judgement capacitance type touch-control panel as claimed in claim 1 is characterized in that, the owner of described characteristic frequency is all less than 200kHz, and each of this four AC signal is all square wave or string ripple signal.
8. a method of judging the contact position on touch control screen of capacitance type touch-control panel is characterized in that, comprises the following step:
The ac sweep signal of four corners of this Touch Screen with a tool one frequency is provided respectively;
The frequency of the frequencies of corresponding alternating-current signals of quick respectively this four corner of switching is between one group of characteristic frequency;
The current value of the correspondence group characteristic frequency of this four corner of difference sensing;
Receive the current value of the corresponding specific bin of this four corner respectively, and respectively the corresponding specific bin of this four corner is selected one group of selected frequency according to a noise filtering program;
Drive this Touch Screen respectively with this frequencies of corresponding alternating-current signals, and the current value of the frequency correspondence in the selected group of frequencies of correspondence of this four corner of difference computing, to obtain a ultimate current value; And
Calculate the coordinate of this contact position on this Touch Screen according to the ultimate current value of this four corners correspondence respectively.
9. the method for the contact position on touch control screen of judgement capacitance type touch-control panel as claimed in claim 8 is characterized in that, described noise filtering program comprises the following step:
Judge the frequency of the tool of one or many corresponding current value in the specific bin of this four corners correspondence, with as one or treat rejection frequency than the great fluctuation process amount more; And
In the specific bin of this four corners correspondence of filtering one or treat rejection frequency respectively with as the selected frequency of this group more; And
This calculation step is the step of the current value of the frequency correspondence in the selected frequency of this group of an addition.
10. the method for the contact position on touch control screen of judgement capacitance type touch-control panel as claimed in claim 8 is characterized in that, described noise filtering program comprises the following step:
Judge one or many noise frequencies that surrounding environment and user cause four corners of this Touch Screen respectively, for it by the mode of the undulate quantity of the formed current value of frequency in the specific bin of this four corners correspondence of sensing; And
Respectively in the specific bin of this four corners correspondence of filtering be same as this one or the frequency of many noise frequencies, with as the selected frequency of this group and this group characteristic frequency, and
This calculation step is the step of the current value of the frequency correspondence in the selected frequency of this group of an addition; And
This noise filtering program only is performed a specific opportunity.
11. the method for the contact position on touch control screen of judgement capacitance type touch-control panel as claimed in claim 10, it is characterized in that be one of following opportunity described specific opportunity: in this capacitance touch control screen is mounted, this capacitance touch control screen is by in starting shooting, and in a particular job task on capacitance touch control screen begins.
12. the method for the contact position on touch control screen of judgement capacitance type touch-control panel as claimed in claim 8 is characterized in that, described noise filtering program comprises the following step:
The undulate quantity of the formed current value of frequency in the specific bin of this four corners correspondence of difference sensing; And
Choose the respective frequencies of the tool one minimal ripple amount of current value corresponding in the specific bin of this four corners correspondence respectively, and organize characteristic frequency with the frequency of this tool minimum current undulate quantity as the selected frequency of this group and this respectively, and
This calculation step is the step of the current value of the frequency correspondence in the selected frequency of this group of an addition; And
This noise filtering program only is performed a specific opportunity.
13. the method for the contact position on touch control screen of judgement capacitance type touch-control panel as claimed in claim 12, it is characterized in that be one of following opportunity described specific opportunity: in this capacitance touch control screen is mounted, this capacitance touch control screen is by in starting shooting, and in a particular job task on capacitance touch control screen begins.
14. the method for the contact position on touch control screen of judgement capacitance type touch-control panel as claimed in claim 8 is characterized in that, the owner of described characteristic frequency is all less than 200kHz, and each of this four AC signal is all square wave or string ripple signal.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101853099B (en) * | 2009-03-30 | 2012-03-28 | 盛群半导体股份有限公司 | Compensation method of touch system |
| CN101882036B (en) * | 2009-05-07 | 2012-08-22 | 联阳半导体股份有限公司 | Positioning device of touch device and positioning method thereof |
| CN101923410B (en) * | 2009-06-11 | 2012-08-22 | 联想(北京)有限公司 | Electronic equipment and touch positioning control method thereof |
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