CN105404417B - Scanning signal frequency determining method and detecting method - Google Patents
Scanning signal frequency determining method and detecting method Download PDFInfo
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- CN105404417B CN105404417B CN201510717097.2A CN201510717097A CN105404417B CN 105404417 B CN105404417 B CN 105404417B CN 201510717097 A CN201510717097 A CN 201510717097A CN 105404417 B CN105404417 B CN 105404417B
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000001228 spectrum Methods 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 8
- 238000010183 spectrum analysis Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000006698 induction Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 2
- 244000144992 flock Species 0.000 description 2
- 230000009897 systematic effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- 239000004744 fabric Substances 0.000 description 1
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- 238000012545 processing Methods 0.000 description 1
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Classifications
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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 scanning signal frequency determining method and detection method, believe by the scanning especially in regard to touch device
Number frequency determining method and its touch control detecting method.
Background technique
Touch panel is widely used in various electronic devices as a kind of convenient input unit.And projected capacitive
Formula, condenser type or electric resistance touch-control panel are usually to issue scanning signal with scan line, obtain corresponding reception letter with the line of induction
Number, and judge whether the certain point on touch panel is touched to receive signal.
However, the method for the existing frequency for determining scanning signal, is usually empirically directly determined by designer.But
The scanning signal of different frequency, it is different to be touched in panel circuit noise effect, how systematic to look for
The frequency of preferable scanning signal is sought, is a problem to be solved to avoid the erroneous judgement of touch-control caused by noise in touch panel.
Summary of the invention
In view of above problem, the present invention proposes a kind of scanning signal frequency determining method and relevant touch control detection side
Method.Scanning signal frequency determining method proposed in one embodiment of the invention determines antinoise energy with systematic step
The preferable scanning signal frequency of power.Therefore, compared to the design method for generally determining scanning signal frequency with experience, touch panel
Designer apply the lower scanning signal frequency of the available rate of false alarm of the method disclosed in the present.
Scanning signal frequency determining method disclosed in this invention, is suitable for a kind of touch panel, and the method includes following
Step: it is selected from preset signals frequency range multiple to selected frequency.Multiple touch-controls are selected from the touch area of touch panel
Characteristic point.To be scanned with aforementioned multiple signals to be selected to selected frequency to touch panel.To each signal to be selected, divide
The corresponding multiple noise power values of aforementioned touch-control characteristic point are not calculated, to obtain the corresponding noise characteristic of each signal to be selected
Amount.According to noise criteria and obtained multiple noise characteristic amounts, one of signal to be selected sweeping as touch panel is selected
Retouch signal.
Detection method disclosed in this invention, suitable for the touch control detection of touch panel, the method is comprised the steps of
Touch panel is scanned with the scanning signal with the first signal frequency, to obtain multiple reception signals.When aforementioned reception signal
When multiple energy value at least one of them are greater than touch-control threshold value, judge whether the energy Distribution value for receiving signal meets noise
Distribution.When Energy distribution does not meet noise profile, at least one coordinate signal is generated according to the reception signal.When energy point
When cloth meets noise profile, scanning signal revision program is executed, and returns to the step of touch panel is scanned with scanning signal, scanning
Signal correction program comprise the steps of selected from predeterminated frequency range it is multiple to selected frequency.With with aforementioned to selected frequency
Multiple signals to be selected touch panel is scanned.To each signal to be selected, calculate separately corresponding to the more of touch panel
Multiple noise power values of a touch-control characteristic point, to obtain the corresponding noise characteristic amount of each signal to be selected.According to noise criteria
With obtained multiple noise characteristic amounts, select one of aforementioned signal to be selected as scanning signal.
The explanation of explanation and the following embodiments and the accompanying drawings above with respect to the content of present invention is of the invention with explanation to demonstrate
Spirit and principle, and scope of patent protection of the invention is provided and is further explained.
Detailed description of the invention
Fig. 1 is the touch panel of an embodiment and its embedded controller schematic diagram according to the present invention.
Fig. 2 is the scan frequency determining method flow chart of an embodiment according to the present invention.
Fig. 3 is the detection method flow chart of an embodiment according to the present invention.
Wherein, appended drawing reference:
1000 touch panels
1100 embedded controllers
Tx1~TxM scan line
Rx1~RxN line of induction
Specific embodiment
Describe detailed features and advantage of the invention in detail in embodiments below, content is enough to make any ability
The technical staff in domain understands technology contents of the invention and implements accordingly, and is wanted according to content disclosed in this specification, right
Protection scope and attached drawing are asked, any those skilled in the art can be readily understood upon the relevant purpose of the present invention and advantage.Below
The embodiment system viewpoint that present invention be described in more detail, but it is non-anyways to limit scope of the invention.
Fig. 1 is please referred to, for the touch panel of an embodiment and its embedded controller schematic diagram according to the present invention.Such as Fig. 1
Shown, touch panel 1000 has embedded controller 1100, M scan line Tx1~TxM and N line of induction Rx1~RxN.Wherein
Embedded controller 1100 sequentially sends out scanning signal with scan line Tx1 to TxM, and is incuded with line of induction Rx1 to RxN and receive letter
Number.
In an embodiment, when aforementioned touch panel 1000 will determine the frequency of its scanning signal, determined about it
Method, please with reference to Fig. 1 and Fig. 2, wherein Fig. 2 is the scan frequency determining method flow chart of an embodiment according to the present invention.
As shown in Fig. 2, the scan frequency determining method of the present embodiment comprises the steps of.First as shown in step S2100, control is embedded
Device 1100 selects multiple to selected frequency from preset signals frequency range.For example, so-called preset signals frequency range is
A frequency range generally centered on the frequency that experience determines scanning signal.Assuming that general experience determines scanning signal
Frequency is 100 kilo hertzs (kilo-hertz, kHz), then preset signals frequency range can be 50kHz to 150kHz.In following reality
Apply in example, embed controller 1100 from 50kHz to 150kHz in the range of, selected 11 to selected frequency, respectively
50kHz, 60kHz, 70kHz ... 140kHz and 150kHz.
As shown in step S2200, embedded controller 1100 selects multiple touch-controls from the touch area of touch panel 1000
Characteristic point.In an embodiment, embeds controller 1100 and select scan line Txi, scan line Txj and line of induction Rxx, the line of induction
The plotted point of Rxy totally four plotted points as touch-control characteristic point.Wherein i and j be positive integer less than or equal to M and x and y be less than
Positive integer equal to N.I is not equal to j and x is not equal to y.
Then as shown in step S2300, controller 1100 is embedded with aforementioned multiple signals pair to be selected to selected frequency
Touch panel 1000 is scanned.And as shown in step S2400, to each signal to be selected, embedded controller 1100 is calculated separately
The corresponding multiple noise power values of multiple touch-control characteristic points, to obtain the corresponding noise characteristic amount of each signal to be selected.It is specific next
Say, in a kind of embodiment, embed controller 1100 at least with the aforementioned signal to be selected to selected frequency to scan line Txi
It is scanned with scan line Txj, and is obtained from line of induction Rxx and line of induction Rxy and receive signal.For example, controller is embedded
1100 are first scanned scan line Txi and scan line Txj with the signal to be selected with 50kHz, then from line of induction Rxx and sense
It answers line Rxy to obtain and receives signal.Then, the four receptions signal corresponding to four touch-control characteristic points respectively of controller 1100 is embedded
Carry out lower column operations.
By taking the touch-control characteristic point that scan line Txi is intersected with line of induction Rxx as an example, controller 1100 is embedded first for this touch-control
The reception signal of characteristic point carries out spectrum analysis to obtain connecing about this touch-control characteristic point and frequency for the signal to be selected of 50kHz
The energy frequency spectrum of the collection of letters number is distributed (power spectrum).The method of spectrum analysis such as Fourier transform (fourier
Transform), wavelet conversion (wavelet transform) or other similar method (such as fast Fourier transform).
Then, controller 1100 is embedded from the distribution of aforementioned energy frequency spectrum, the energy that removal frequency is 50kHz, to obtain this touch-control spy
The noise spectrum that sign point corresponds to the signal to be selected that frequency is 50kHz is distributed (noise spectrum).Then according to this noise
Spectrum distribution calculates signal to be selected and the noise power value in this touch-control characteristic point that frequency is 50kHz.For example, it will make an uproar
Audio spectrum is distributed in frequency domain upper integral, will obtain the noisy energy summation of institute, that is, noise power value above-mentioned.So
Aforementioned processing sequentially is carried out to other three touch-control characteristic points, also just always meets together to obtain four noise power values.Then with this four
A noise power value calculates the corresponding noise characteristic amount of signal to be selected that frequency is 50kHz.For example, noise characteristic amount can
It is maximum with the smallest difference of energy (difference) or ratio (ratio) to be defined as energy in four noise power values,
However it is not limited thereto.In other embodiments, embeds controller 1100 and reception signal intermediate frequency rate is first removed with filter
The ingredient of 50kHz then carries out noise characteristic amount of the subsequent calculating to obtain.
In this way, embedded controller 1100 also in the foregoing manner, calculates separately out the noise characteristic amount of other signals to be selected, example
As frequency be 60kHz signal to be selected, frequency be 70kHz signal ... to be selected or even frequency be 150kHz signal to be selected.
Then as shown in step S2500, controller 1100 is embedded according to noise characteristic amount above-mentioned and a noise criteria, selection is wherein
Scanning signal of one signal to be selected as touch panel 1000.In an embodiment, so-called noise criteria is provided embedded
Controller 1100 selects signal to be selected corresponding to the smallest noise characteristic amount, as scanning signal.If frequency 90kHz's
The noise characteristic amount that signal to be selected is calculated according to method above-mentioned than the signal to be selected of remaining frequency noise characteristic amount all
Small, then embedding controller 1100 can be using the signal to be selected of frequency 90kHz as scanning signal.
Specifically, embed controller 1100 after the signal scanning to be selected with frequency 50kHz, first by its frequency values with make an uproar
Acoustic signature amount is stored in the memory unit of embedded controller 1100.It is later the signal scanning to be selected of 60kHz with frequency, and
Judge whether its noise characteristic amount is less than the noise characteristic amount for being stored in memory unit, if it is judged that be it is no, then continue with
Frequency be 70kHz signal scanning to be selected, if it is judged that be it is yes, then use 60kHz signal to be selected frequency values and noise
Characteristic quantity overrides frequency values and noise characteristic amount in memory unit, and continues to lay equal stress on the signal scanning to be selected of frequency 70kHz
Mentioned above principle is answered selectively to override the frequency values in memory unit and noise characteristic amount.When embedded controller 1100 uses frequency
The signal scanning to be selected of 150kHz and after completing aforementioned running, embedded controller 1100 selects the frequency of retention from memory unit
Value, noise characteristic amount will multiple in predeterminated frequency range have minimum noise characteristic amount to selected frequency.
In another embodiment, noise criteria is a noise characteristic threshold value, and embedded controller 1100 is special from noise
Sign amount chooses one as scanning signal lower than in the signal to be selected of noise characteristic threshold value.For example, noise characteristic threshold value is 20,
And to be selected signal of the noise characteristic amount lower than 20 has the signal to be selected that signal to be selected, frequency that frequency is 70kHz are 110kHz
The signal to be selected for being 130kHz with frequency.Controller 1100 is then embedded to select one from aforementioned three signals to be selected (such as frequency is
The signal to be selected of 110kHz) it is used as scanning signal.
Therefore, the present invention more discloses a kind of touch control detecting method using aforementioned scanning signal determining method, please joins together
According to Fig. 1 and Fig. 3, wherein Fig. 3 is the detection method flow chart of an embodiment according to the present invention.As shown in figure 3, presently disclosed
Touch control detecting method have the following steps:
As shown in step S3100, embed controller 1100 with scanning signal scanning touch panel all scan lines, with from
All lines of induction obtain multiple reception signals, and scanning signal has the first signal frequency, such as 100kHz.And such as step
Shown in S3200, judge whether the energy value of one of multiple reception signals is greater than touch-control threshold value.When judging result be it is no, return
To step S3100 to be scanned next time.When the result judged be it is yes, then as shown in step S3300, embed controller 1100
Further judge whether the aforementioned energy Distribution value for receiving signal meets noise profile.If it is judged that be it is no, then such as step
Shown in S3400, embedded controller 1100 generates at least one coordinate signal according to reception signal above-mentioned.If it is judged that being
It is then as shown in step S3500, to execute scanning signal revision program, return to step S3100 later, with revised scanning letter
It number is scanned.Wherein scanning signal revision program is exactly scanning signal frequency determining method as shown in Figure 2.And it is therein pre-
If a frequency range of the frequency range centered on the first signal frequency, for example, 50kHz to 150kHz.
And the noise profile in step S3300, for example, if touch panel 1000 is general single-point touch, when
Energy value is greater than scan line corresponding to the reception signal of touch-control threshold value and not flocks together with line of induction plotted point, but point
It dissipates for multiple blocks, then judges itself and improper touch-control result.Or when energy value is greater than the reception signal institute of touch-control threshold value
Corresponding plotted point flocks together, but its total quantity is greater than an amount threshold, that is to say, that judges by the area of touch-control
It is excessive, then it may be erroneous judgement caused by noise or the abnormal operation of user.
And if touch panel 1000 can support multi-point touch, so-called noise profile can be aforementioned by touch-control area mistake
Greatly or energy value be greater than touch-control threshold value receptions signal corresponding to plotted point correspond to same scan line (or incude
Line) all plotted points (or most of plotted points).In other words, the touch-control that the touch control operation of user can not occur
Figure (pattern) can be used as a kind of possible noise profile.
In addition, when executing scanning signal revision program, the touch-control characteristic point to be selected, in one embodiment, due to
It may be really to be touched by user that preceding energy value, which is greater than plotted point corresponding to touch-control threshold value, it is therefore necessary to not from energy value
Other plotted points greater than touch-control threshold value select touch-control characteristic point.In another embodiment, such as energy value is greater than touch-control threshold
When the corresponding multiple plotted points of value are corresponding same scan lines, because should be erroneous judgement caused by noise, at least
One touch-control characteristic point must be greater than multiple plotted points corresponding to touch-control threshold value as energy value and select.
Although the present invention is disclosed as above with embodiment above-mentioned, it is not intended to limit the invention.This hair is not being departed from
In bright spirit and scope, carried out by change and modification, belong to scope of patent protection of the invention.It is defined about the present invention
Protection scope please refers to the attached claims protection scope.
Claims (10)
1. a kind of detection method is suitable for a touch panel, which is characterized in that this method includes:
The touch panel is scanned with scan signal, to obtain multiple reception signals, which has one first signal frequency
Rate；
When multiple energy value at least one of them that those receive signal are greater than a touch-control threshold value, judge that those receive signal
Whether one energy Distribution value meets a noise profile；
When the energy Distribution value does not meet the noise profile, signal is received according to those and generates an at least coordinate signal；And
When the Energy distribution meets the noise profile, scan signal revision program is executed, and return to and sweep with the scanning signal
The step of retouching the touch panel, which includes:
It is selected from a predeterminated frequency range multiple to selected frequency；
To have those to wait for that multiple signals to be selected of selected frequency are scanned the touch panel；
To each signal to be selected, multiple noise energies of multiple touch-control characteristic points corresponding to the touch panel are calculated separately
Value, to obtain the corresponding noise characteristic amount of the signal to be selected；And
According to those noise characteristic amounts and a noise criteria, select one of those signals to be selected as the scanning signal.
2. the method as described in claim 1, which is characterized in that the predeterminated frequency range, which is with first signal frequency, is
The heart.
3. the method as described in claim 1, which is characterized in that in each signal to be selected, calculate separately those touch-controls spy
Corresponding those noise power values of sign point are that those are made an uproar the step of to obtain the signal to be selected corresponding noise characteristic amount
With maximum noise energy value in acoustic energy value, subtracting has minimal noise energy value in those noise power values, with
To the noise characteristic amount.
4. the method as described in claim 1, which is characterized in that in each signal to be selected, calculate separately those touch-controls spy
Corresponding those noise power values of sign point are that those are made an uproar the step of to obtain the signal to be selected corresponding noise characteristic amount
With maximum noise energy value in acoustic energy value, divided by having minimal noise energy value in those noise power values, to obtain
To the noise characteristic amount.
5. the method as described in claim 1, which is characterized in that in each signal to be selected, calculate separately those touch-controls spy
Corresponding those noise power values of sign point, the step of to obtain the signal to be selected corresponding noise characteristic amount in, to it is each should
Touch-control characteristic point includes:
Spectrum analysis is carried out to obtain an energy frequency spectrum to the reception signal for being associated with the touch-control characteristic point and the signal to be selected
Distribution；
From energy frequency spectrum distribution, removal corresponds to the energy of the signal to be selected, to obtain noise spectrum distribution；And
It is distributed according to the noise spectrum, calculates the noise power value about the signal to be selected and the touch-control characteristic point.
6. method as claimed in claim 5, which is characterized in that carrying out spectrum analysis to the reception signal is to the reception signal
Execute wavelet function conversion or a fast Fourier transform.
7. the method as described in claim 1, which is characterized in that in each signal to be selected, calculate separately those touch-controls spy
Corresponding those noise power values of sign point, the step of to obtain the signal to be selected corresponding noise characteristic amount in, to it is each should
Touch-control characteristic point includes:
To the touch-control characteristic point is associated with and the reception signal of the signal to be selected is filtered, to filter out the signal to be selected；
Spectrum analysis is carried out to the reception signal filtered to obtain energy frequency spectrum distribution；And
It is distributed according to the energy frequency spectrum, calculates the noise power value about the signal to be selected and the touch-control characteristic point.
8. the method as described in claim 1, which is characterized in that according to those noise characteristic amounts and the noise criteria, selection
It is to select those noise characteristic amounts most in the step of scanning signal as the touch panel of one of those signals to be selected
Signal to be selected corresponding to the small noise characteristic amount, as the scanning signal.
9. the method as described in claim 1, which is characterized in that the noise criteria is a noise characteristic threshold value, and in foundation
Those noise characteristic amounts and the noise criteria, select the scanning signal of one of those signals to be selected as the touch panel
The step of in, comprising from the corresponding noise characteristic amount lower than at least the one of the noise characteristic threshold value signal to be selected, selection
One of them is used as the scanning signal.
10. the method as described in claim 1, which is characterized in that those touch-control characteristic points are that array is distributed in the touch-control
The touch area of panel.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| CN105404417A CN105404417A (en) | 2016-03-16 |
| CN105404417B true CN105404417B (en) | 2019-05-24 |
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| CN201510717097.2A Active CN105404417B (en) | 2015-08-12 | 2015-10-29 | Scanning signal frequency determining method and detecting method |
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| TW (1) | TWI613575B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI601967B (en) | 2017-01-09 | 2017-10-11 | Acer Inc | Detecting method and system for touch apparatus |
| CN107506067B (en) * | 2017-07-24 | 2020-02-21 | Oppo广东移动通信有限公司 | Method and device for debugging working frequency of touch screen and terminal equipment |
| CN109117020B (en) * | 2018-07-19 | 2022-09-20 | 北京集创北方科技股份有限公司 | Positioning method and device of touch position, storage medium and electronic device |
| 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 |
|---|---|
| TWI613575B (en) | 2018-02-01 |
| CN105404417A (en) | 2016-03-16 |
| TW201706786A (en) | 2017-02-16 |
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