CN105404417A - Scanning signal frequency determining method and detecting method - Google Patents
Scanning signal frequency determining method and detecting method Download PDFInfo
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- CN105404417A CN105404417A CN201510717097.2A CN201510717097A CN105404417A CN 105404417 A CN105404417 A CN 105404417A CN 201510717097 A CN201510717097 A CN 201510717097A CN 105404417 A CN105404417 A CN 105404417A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
Abstract
The invention discloses a method for determining scanning signal frequency, which is suitable for a touch panel and comprises the following steps: a plurality of frequencies to be selected are selected from a preset signal frequency range. A plurality of touch characteristic points are selected from a touch area of the touch panel. And scanning the touch panel by a plurality of signals to be selected with the frequency to be selected. And respectively calculating a plurality of noise energy values corresponding to the touch characteristic points for each signal to be selected so as to obtain a noise characteristic quantity corresponding to each signal to be selected. And selecting one of the signals to be selected as a scanning signal of the touch panel according to the noise standard and the obtained noise characteristic quantities.
Description
Technical field
The present invention about a kind of sweep signal frequency determining method and detection method, especially in regard to sweep signal frequency determining method and its touch control detecting method of contactor control device.
Background technology
Contact panel, as one input media easily, is used in various electronic installation widely.And projected capacitive, condenser type or electric resistance touch-control panel normally send sweep signal with sweep trace, obtain corresponding Received signal strength with the line of induction, and whether certain is a bit touched so that Received signal strength judges on contact panel.
But the method for the frequency of existing decision sweep signal, is normally empirically directly determined by deviser.But the sweep signal of different frequency, it is different that it may to be subject in contact panel circuit noise effect, how systematic frequency of looking for good sweep signal, and the touch-control caused to avoid noise in contact panel is judged by accident, and being has problem to be solved.
Summary of the invention
Because above problem, the present invention proposes a kind of sweep signal frequency determining method and relevant touch control detecting method.The sweep signal frequency determining method proposed in one embodiment of the invention, decides the good sweep signal frequency of noise resisting ability with systematic step.Therefore, compared to the general method for designing determining sweep signal frequency with experience, the deviser of contact panel applies the method disclosed in the present and can obtain the lower sweep signal frequency of rate of false alarm.
Sweep signal frequency determining method disclosed in this invention, be suitable for a kind of contact panel, described method comprises the following step: select multiplely to treat selected frequency from preset signals frequency range.Multiple touch-control unique point is selected from the touch area of contact panel.Aforementionedly treat that the signal multiple to be selected of selected frequency scans contact panel to have.To each signal to be selected, calculate multiple noise power value of aforementioned touch-control Feature point correspondence respectively, to obtain a noise characteristic amount corresponding to each signal to be selected.According to noise criteria and the multiple noise characteristic amounts obtained, select one of them sweep signal as contact panel of signal to be selected.
Detection method disclosed in this invention, is applicable to the touch control detection of contact panel, and described method comprises the following step: to have the sweep signal scanning contact panel of the first signal frequency, to obtain multiple Received signal strength.When multiple energy values of aforementioned Received signal strength wherein one of are at least greater than touch-control threshold value, judge whether the energy value distribution of described Received signal strength meets noise profile.When energy distribution does not meet noise profile, produce at least one coordinate signal according to described Received signal strength.When energy distribution meets noise profile, perform sweep signal revision program, and get back to the step of sweep signal scanning contact panel, sweep signal revision program comprises the following step: select multiplely to treat selected frequency from predeterminated frequency scope.Aforementionedly treat that the signal multiple to be selected of selected frequency scans contact panel to have.To each signal to be selected, calculate multiple noise power value of the multiple touch-control unique points corresponding to contact panel respectively, to obtain noise characteristic amount corresponding to each signal to be selected.According to noise criteria and multiple noise characteristic amounts of obtaining, select aforementioned signal to be selected one of them as sweep signal.
Above about the explanation of content of the present invention and the explanation of following embodiment in order to demonstration with explain spirit of the present invention and principle, and provide scope of patent protection of the present invention further to explain.
Accompanying drawing explanation
Fig. 1 is the contact panel of foundation one embodiment of the invention and embedded controller schematic diagram thereof.
Fig. 2 is the sweep frequency determining method process flow diagram according to one embodiment of the invention.
Fig. 3 is the detection method process flow diagram according to one embodiment of the invention.
Wherein, Reference numeral:
1000 contact panels
1100 embedded controllers
Tx1 ~ TxM sweep trace
Rx1 ~ RxN line of induction
Embodiment
Below detailed features of the present invention and advantage is described in embodiments in detail; its content is enough to make any those skilled in the art understand technology contents of the present invention and implement according to this; and according to the content disclosed in this instructions, claims and accompanying drawing, any those skilled in the art can understand the object and advantage that the present invention is correlated with easily.Following embodiment system further describes viewpoint of the present invention, but non-to limit category of the present invention anyways.
Please refer to Fig. 1, it is the contact panel of foundation one embodiment of the invention and embedded controller schematic diagram thereof.As shown in Figure 1, contact panel 1000 has embedded controller 1100, M bar sweep trace Tx1 ~ TxM and N bar line of induction Rx1 ~ RxN.Wherein embedded controller 1100 sequentially sends sweep signal with sweep trace Tx1 to TxM, and responds to Received signal strength with line of induction Rx1 to RxN.
In an embodiment, when aforementioned contact panel 1000 will determine the frequency of its sweep signal, about the method that it determines, please with reference to Fig. 1 and Fig. 2, wherein Fig. 2 is the sweep frequency determining method process flow diagram according to one embodiment of the invention.As shown in Figure 2, the sweep frequency determining method of the present embodiment comprises the following step.First, as shown in step S2100, embedded controller 1100 is selected multiplely to treat selected frequency from preset signals frequency range.For example, so-called preset signals frequency range is a frequency range generally centered by the frequency that experience determines sweep signal.Suppose that general experience determines that the frequency of sweep signal is 100 kilo hertzs (kilo-hertz, kHz), then preset signals frequency range can be 50kHz to 150kHz.In following examples, in the scope of embedded controller 1100 from 50kHz to 150kHz, have selected 11 and treat selected frequency, be respectively 50kHz, 60kHz, 70kHz ... 140kHz and 150kHz.
As shown in step S2200, embedded controller 1100 selects multiple touch-control unique point from the touch area of contact panel 1000.In an embodiment, embedded controller 1100 select sweep trace Txi, sweep trace Txj and line of induction Rxx, line of induction Rxy plotted point totally four plotted points as touch-control unique point.Wherein i and j be less than or equal to M positive integer and x and y is the positive integer being less than or equal to N.I is not equal to j and x is not equal to y.
Then as shown in step S2300, embedded controller 1100 aforementionedly treats that the signal multiple to be selected of selected frequency scans contact panel 1000 to have.And as shown in step S2400, to each signal to be selected, embedded controller 1100 calculates multiple noise power value of multiple touch-control Feature point correspondence respectively, to obtain noise characteristic amount corresponding to each signal to be selected.Specifically, in a kind of embodiment, embedded controller 1100 at least aforementionedly treats that the signal to be selected of selected frequency scans sweep trace Txi and sweep trace Txj to have, and obtains Received signal strength from line of induction Rxx and line of induction Rxy.For example, embedded controller 1100 first scans sweep trace Txi and sweep trace Txj with the signal to be selected with 50kHz, then obtains Received signal strength from line of induction Rxx and line of induction Rxy.Then, embedded controller 1100 carries out lower column operations to four Received signal strength of four touch-control Feature point correspondence respectively.
For the touch-control unique point of sweep trace Txi and line of induction Rxx intersection, embedded controller 1100 first distributes (powerspectrum) for the Received signal strength of this touch-control unique point energy frequency spectrum that to carry out spectrum analysis to obtain about this touch-control unique point and frequency be the Received signal strength of the signal to be selected of 50kHz.Method such as fourier transform (fouriertransform), wavelet conversion (wavelettransform) or other similar methods (such as fast fourier transform) of spectrum analysis.Then, embedded controller 1100 is from the distribution of aforementioned energy frequency spectrum, and removing frequency is the energy of 50kHz, to obtain this touch-control Feature point correspondence in noise spectrum distribution (noisespectrum) of the frequency signal to be selected that is 50kHz.Then distribute according to this noise spectrum, calculated rate is the signal to be selected of 50kHz and the noise power value in this touch-control unique point.For example, noise spectrum is distributed in frequency domain upper integral, will noisy energy summation be obtained, namely aforesaid noise power value.So sequentially aforementioned processing is carried out to other three touch-control unique points, also just always meet together and obtain four noise power value.Then calculate noise characteristic amount corresponding to signal to be selected that frequency is 50kHz with these four noise power value.For example, noise characteristic amount can be defined as the maximum difference (difference) minimum with energy of energy in four noise power value or ratio (ratio), but not as limit.In other embodiments, the composition of Received signal strength medium frequency 50kHz first removed by embedded controller 1100 with wave filter, then carry out subsequent calculations with the noise characteristic amount obtained.
So, embedded controller 1100 also in the foregoing manner, calculates the noise characteristic amount of other signals to be selected respectively, the signal to be selected that the signal to be selected that such as frequency is 60kHz, frequency are 70kHz ... and even frequency is the signal to be selected of 150kHz.Then as shown in step S2500, embedded controller 1100, according to aforesaid noise characteristic amount and a noise criteria, selects one of them signal to be selected as the sweep signal of contact panel 1000.In an embodiment, so-called noise criteria is that the embedded controller 1100 of regulation selects the minimum signal to be selected corresponding to this noise characteristic amount, as sweep signal.If the noise characteristic amount that the signal to be selected of frequency 90kHz calculates according to aforesaid method is all less than the noise characteristic amount of the signal to be selected of all the other frequencies, then embedded controller 1100 can using the signal to be selected of frequency 90kHz as sweep signal.
Specifically, its frequency values and noise characteristic amount after with the signal scanning to be selected of frequency 50kHz, are first stored in the mnemon of embedded controller 1100 by embedded controller 1100.Be the signal scanning to be selected of 60kHz afterwards with frequency, and judge whether its noise characteristic amount is less than the noise characteristic amount being stored in mnemon, if judged result is no, then continuing take frequency as the signal scanning to be selected of 70kHz, if judged result is yes, then override frequency values in mnemon and noise characteristic amount by the frequency values of the signal to be selected of 60kHz and noise characteristic amount, and continue with the signal scanning to be selected of frequency 70kHz, and repeat mentioned above principle and optionally override frequency values in mnemon and noise characteristic amount.When embedded controller 1100 is with the signal scanning to be selected of frequency 150kHz and after completing aforementioned running, the frequency values of retention selected by embedded controller 1100 from mnemon, its noise characteristic amount will be in predeterminated frequency scope multiple treat selected frequency there is minimum noise characteristic amount.
In another embodiment, noise criteria is a noise characteristic threshold value, and embedded controller 1100 from noise characteristic amount lower than the signal to be selected of noise characteristic threshold value, choose one as sweep signal.For example, noise characteristic threshold value is 20, and noise characteristic amount lower than 20 signal to be selected have frequency is the signal to be selected of 70kHz, frequency is 110kHz signal to be selected and frequency to be the signal to be selected of 130kHz.Then embedded controller 1100 selects one (such as frequency is the signal to be selected of 110kHz) as sweep signal from aforementioned three signals to be selected.
Therefore, the touch control detecting method of the opener a kind of application of aforementioned sweep signal determining method of the present invention, please with reference to Fig. 1 and Fig. 3, wherein Fig. 3 is the detection method process flow diagram according to one embodiment of the invention.As shown in Figure 3, touch control detecting method disclosed in this invention has the following step:
As shown in step S3100, embedded controller 1100 is with all sweep traces of sweep signal scanning contact panel, and to obtain multiple Received signal strength from all lines of induction, sweep signal has the first signal frequency, such as 100kHz.And as shown in step S3200, judge whether one of them energy value of multiple Received signal strength is greater than touch-control threshold value.When judged result is no, get back to step S3100 to scan next time.When the result judged is yes, then as shown in step S3300, embedded controller 1100 judges whether the energy value distribution of aforementioned Received signal strength meets noise profile further.If judged result is no, then as shown in step S3400, embedded controller 1100 produces at least one coordinate signal according to aforesaid Received signal strength.If judged result is yes, then as shown in step S3500, perform sweep signal revision program, get back to step S3100 afterwards, scan with revised sweep signal.Wherein sweep signal revision program is exactly sweep signal frequency determining method as shown in Figure 2.And the frequency range of predeterminated frequency scope wherein centered by the first signal frequency, be such as 50kHz to 150kHz.
And the noise profile in step S3300, for example, if contact panel 1000 is general single-point touch, sweep trace corresponding to the Received signal strength being then greater than touch-control threshold value when energy value and line of induction plotted point not flock together, but be separated into multiple block, then judge it and improper touch-control result.Or the plotted point corresponding to Received signal strength being greater than touch-control threshold value when energy value flocks together, but its total quantity is greater than an amount threshold, that is judging by the area of touch-control excessive, then may be the erroneous judgement that causes of noise or the abnormal operation of user.
And if contact panel 1000 can support multi-point touch, then so-called noise profile can be aforementioned excessive by touch-control area, or energy value is greater than the plotted point corresponding to Received signal strength of touch-control threshold value at all plotted points (or most of plotted point) corresponding to same sweep trace (or line of induction).In other words, namely the touch-control figure (pattern) that the touch control operation of user can not occur can be used as a kind of possible noise profile.
In addition, when performing sweep signal revision program, the touch-control unique point selected, in an embodiment, because the preceding energy value plotted point be greater than corresponding to touch-control threshold value may be really touched by user, other plotted points that therefore must be not more than touch-control threshold value from energy value select touch-control unique point.In another embodiment, such as, when the energy value multiple plotted points be greater than corresponding to touch-control threshold value are corresponding same sweep traces, because should be the erroneous judgement that noise causes, so multiple plotted points that at least one touch-control unique point must be greater than corresponding to touch-control threshold value by energy value are selected.
Although the present invention with aforesaid embodiment openly as above, it is also not used to limit the present invention.Without departing from the spirit and scope of the present invention, the change of doing and amendment, all belong to scope of patent protection of the present invention.The protection domain defined about the present invention please refer to appended claims.
Claims (19)
1. a sweep signal frequency determining method, is suitable for a contact panel, it is characterized in that, described method comprises:
Select multiplely to treat selected frequency from a preset signals frequency range;
Multiple touch-control unique point is selected from the touch area of this contact panel;
Treat that the signal multiple to be selected of selected frequency scans this contact panel to have those;
This signal to be selected to each, calculates multiple noise power value of those touch-control Feature point correspondence respectively, to obtain a noise characteristic amount corresponding to this signal to be selected; And
According to those noise characteristic amounts and a noise criteria, select one of them one scan signal as this contact panel of those signals to be selected.
2. the method for claim 1, it is characterized in that, in this signal to be selected to each, calculate those noise power value of those touch-control Feature point correspondence respectively, to obtain the step of this noise characteristic amount corresponding to this signal to be selected, by in those noise power value, there is maximum noise energy value, deduct in those noise power value and there is minimal noise energy value, obtaining this noise characteristic amount.
3. the method for claim 1, it is characterized in that, in this signal to be selected to each, calculate those noise power value of those touch-control Feature point correspondence respectively, to obtain the step of this noise characteristic amount corresponding to this signal to be selected, by in those noise power value, there is maximum noise energy value, divided by having minimal noise energy value in those noise power value, obtaining this noise characteristic amount.
4. the method for claim 1, is characterized in that, in this signal to be selected to each, calculate those noise power value of those touch-control Feature point correspondence respectively, to obtain in the step of this noise characteristic amount corresponding to this signal to be selected, to each this touch-control unique point, comprise:
Carry out spectrum analysis to the Received signal strength being associated with this touch-control unique point and this signal to be selected to distribute to obtain an energy frequency spectrum;
From the distribution of this energy frequency spectrum, remove the energy corresponding to this signal to be selected, to obtain a noise spectrum distribution; And
Distribute according to this noise spectrum, calculate this noise power value about this signal to be selected and this touch-control unique point.
5. method as claimed in claim 4, is characterized in that, carrying out spectrum analysis to this Received signal strength is perform wavelet function conversion or a fast fourier transform to this Received signal strength.
6. the method for claim 1, is characterized in that, in this signal to be selected to each, calculate those noise power value of those touch-control Feature point correspondence respectively, to obtain in the step of this noise characteristic amount corresponding to this signal to be selected, to each this touch-control unique point, comprise:
Filtering is carried out to the Received signal strength being associated with this touch-control unique point and this signal to be selected, with this signal to be selected of filtering;
Spectrum analysis is carried out to obtain an energy frequency spectrum distribution to filtered Received signal strength; And
Distribute according to this energy frequency spectrum, calculate this noise power value about this signal to be selected and this touch-control unique point.
7. the method for claim 1, it is characterized in that, in according to those noise characteristic amounts and this noise criteria, select in one of them step as this sweep signal of this contact panel of those signals to be selected, this signal to be selected corresponding to this noise characteristic amount selecting those noise characteristic amounts minimum, as this sweep signal.
8. the method for claim 1, it is characterized in that, this noise criteria is a noise characteristic threshold value, and according to those noise characteristic amounts and this noise criteria, select in one of them step as this sweep signal of this contact panel of those signals to be selected, to comprise from this noise characteristic amount of correspondence lower than this signal to be selected at least one of this noise characteristic threshold value, select one of them as this sweep signal.
9. the method for claim 1, is characterized in that, those touch-control unique points are touch areas being distributed in this contact panel of array.
10. a detection method, be suitable for a contact panel, it is characterized in that, the method comprises:
With this contact panel of one scan signal scanning, to obtain multiple Received signal strength, this sweep signal has one first signal frequency;
When multiple energy values of those Received signal strength wherein one of are at least greater than a touch-control threshold value, judge whether an energy value distribution of those Received signal strength meets a noise profile;
When the distribution of this energy value does not meet this noise profile, produce at least one coordinate signal according to those Received signal strength; And
When this energy distribution meets this noise profile, perform one scan signal correction program, and get back to the step scanning this contact panel with this sweep signal, this sweep signal revision program comprises:
Select multiplely to treat selected frequency from a predeterminated frequency scope;
Treat that the signal multiple to be selected of selected frequency scans this contact panel to have those;
This signal to be selected to each, calculates multiple noise power value of the multiple touch-control unique points corresponding to this contact panel, respectively to obtain a noise characteristic amount corresponding to this signal to be selected; And
According to those noise characteristic amounts and a noise criteria, select those signals to be selected one of them as this sweep signal.
11. methods as claimed in claim 10, is characterized in that, this predeterminated frequency scope is centered by this first signal frequency.
12. methods as claimed in claim 10, it is characterized in that, in this signal to be selected to each, calculate those noise power value of those touch-control Feature point correspondence respectively, to obtain the step of this noise characteristic amount corresponding to this signal to be selected, by in those noise power value, there is maximum noise energy value, deduct in those noise power value and there is minimal noise energy value, obtaining this noise characteristic amount.
13. methods as claimed in claim 10, it is characterized in that, in this signal to be selected to each, calculate those noise power value of those touch-control Feature point correspondence respectively, to obtain the step of this noise characteristic amount corresponding to this signal to be selected, by in those noise power value, there is maximum noise energy value, divided by having minimal noise energy value in those noise power value, obtaining this noise characteristic amount.
14. methods as claimed in claim 10, is characterized in that, in this signal to be selected to each, calculate those noise power value of those touch-control Feature point correspondence respectively, to obtain in the step of this noise characteristic amount corresponding to this signal to be selected, to each this touch-control unique point, comprise:
Carry out spectrum analysis to this Received signal strength being associated with this touch-control unique point and this signal to be selected to distribute to obtain an energy frequency spectrum;
From the distribution of this energy frequency spectrum, remove the energy corresponding to this signal to be selected, to obtain a noise spectrum distribution; And
Distribute according to this noise spectrum, calculate this noise power value about this signal to be selected and this touch-control unique point.
15. methods as claimed in claim 14, is characterized in that, carrying out spectrum analysis to this Received signal strength is perform wavelet function conversion or a fast fourier transform to this Received signal strength.
16. methods as claimed in claim 10, is characterized in that, in this signal to be selected to each, calculate those noise power value of those touch-control Feature point correspondence respectively, to obtain in the step of this noise characteristic amount corresponding to this signal to be selected, to each this touch-control unique point, comprise:
Filtering is carried out to this Received signal strength being associated with this touch-control unique point and this signal to be selected, with this signal to be selected of filtering;
Spectrum analysis is carried out to obtain an energy frequency spectrum distribution to filtered Received signal strength; And
Distribute according to this energy frequency spectrum, calculate this noise power value about this signal to be selected and this touch-control unique point.
17. methods as claimed in claim 10, it is characterized in that, in according to those noise characteristic amounts and this noise criteria, select in one of them step as this sweep signal of this contact panel of those signals to be selected, this signal to be selected corresponding to this noise characteristic amount selecting those noise characteristic amounts minimum, as this sweep signal.
18. methods as claimed in claim 10, it is characterized in that, this noise criteria is a noise characteristic threshold value, and according to those noise characteristic amounts and this noise criteria, select in one of them step as this sweep signal of this contact panel of those signals to be selected, to comprise from this noise characteristic amount of correspondence lower than this signal to be selected at least one of this noise characteristic threshold value, select one of them as this sweep signal.
19. methods as claimed in claim 10, is characterized in that, those touch-control unique points are touch areas being distributed in this contact panel of array.
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| Application Number | Priority Date | Filing Date | Title |
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| TW104126231A TWI613575B (en) | 2015-08-12 | 2015-08-12 | Method for determining frequency of scanning signal and detecting method |
| TW104126231 | 2015-08-12 |
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| CN105404417B CN105404417B (en) | 2019-05-24 |
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| CN107506067A (en) * | 2017-07-24 | 2017-12-22 | 广东欧珀移动通信有限公司 | Working frequency adjustment method, device and the terminal device of touch-screen |
| CN109117020A (en) * | 2018-07-19 | 2019-01-01 | 北京集创北方科技股份有限公司 | Localization method and device, storage medium, the electronic device of position of touch |
| US10552993B2 (en) | 2017-01-09 | 2020-02-04 | Acer Incorporated | Detecting method and system for touch apparatus |
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| CN111610872B (en) * | 2019-02-26 | 2023-07-07 | 敦泰电子有限公司 | Touch control method, circuit system and touch device |
| TWI783456B (en) * | 2021-04-21 | 2022-11-11 | 大陸商北京集創北方科技股份有限公司 | Scanning frequency determination method of touch device and touch display device and information processing device using same |
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| Publication number | Publication date |
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| TWI613575B (en) | 2018-02-01 |
| CN105404417B (en) | 2019-05-24 |
| TW201706786A (en) | 2017-02-16 |
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