CN106059558B - The method and its touch recognition system of touch action can not be identified by solving touch key-press - Google Patents
The method and its touch recognition system of touch action can not be identified by solving touch key-press Download PDFInfo
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- CN106059558B CN106059558B CN201610474173.6A CN201610474173A CN106059558B CN 106059558 B CN106059558 B CN 106059558B CN 201610474173 A CN201610474173 A CN 201610474173A CN 106059558 B CN106059558 B CN 106059558B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/96—Touch switches
- H03K17/962—Capacitive touch switches
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
- H03K2217/96—Touch switches
- H03K2217/9607—Capacitive touch switches
- H03K2217/960735—Capacitive touch switches characterised by circuit details
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- Input From Keyboards Or The Like (AREA)
Abstract
The invention discloses a kind of methods that solution touch key-press can not identify touch action, including 1) give system electrification, and system takes multiple scan touch key-press, set out suitable high threshold values VH and low valve valve VL；2) system enters low-power consumption mode, continues to test touch key-press to determine whether wake-up system；3) enter normal mode after system is waken up, make to be compared with high threshold values VH and low valve valve VL respectively by the capacitor conversion value for scanning touch key-press to judge in a manner of system wake-up；4) if system wakes up since finger touches, identifies which specific key is touched simultaneously comprehensive analysis and goes out the behavior touched, then execute specific touch behavior operation；5) if system wakes up since finger is taken away, touch key-press is taken multiple scan, new more suitable high threshold values and low valve valve is set out, enters step 2).
Description
Technical field
The present invention relates to capacitance type touch key fields, it particularly relates to which a kind of solution touch key-press can not identify touching
Touch the method and its touch recognition system of movement.
Background technique
Compared to traditional mechanical key, capacitance touch induced key is not only durable, long service life but also takes into account
The advantages that safety, beauty, it has changed the method for traditional mechanical key, only needs gently touch, so that it may very square
Just reach key control effect, and have more more flexible control methods, such as slip gesture control etc..It is wide
It is general to be applied to the multiple fields such as mobile phone, household electrical appliances, smart home even Industry Control.In user experience, capacitance touch sense
Answering the false triggering of key or triggering insensitive is most important problem, and normal initialization of the system when powering on rises among these
To important role, be otherwise likely to occur initialization after operation irregularity the case where, the power-up initializing for how reaching stable is
It has to consider the problems of.
Firstly, take off capacitance touch induced key basic functional principle, as shown in Figure 1, when no touch, on key
There is equivalent parasitic capacitance C0, when finger touches, it will introduce a capacitor C1 and be parallel on key, because of finger and the earth
Between equivalent capacity Cbody it is very big, corresponding capacitive reactance can be ignored, thus the potential of finger and the earth it is of substantially equal, this
Sample has been equivalent on key a capacitor C1 in parallel, and capacitor increases, and corresponding conversion value becomes larger, so there is no touch two
A suitable threshold value is chosen between conversion value in the case of kind, so that it may touch action is correctly identified, when capacitor conversion value is less than
When this threshold value, it is judged as key no touch, and when capacitor conversion value is greater than this threshold value, then it is judged as touch action；
The disturbed condition in view of ambient noise is wherein needed in given threshold, because the capacitor on key is about tens
Pico farad, the capacitance variations that finger introduces are smaller (within 10pf), so noise jamming cannot ignore, it is general corresponding
The situation of change of capacitor conversion value on to key is reflected in the value that continuous several times scan, and can change within the scope of one,
Change namely between peak and minimum, it is random when noise jamming, it is possible to by highest within the regular hour
The average value of value and minimum regards capacitor conversion value as, when finger touch, noise jamming it is also the same follow presence,
Average value can follow finger to touch and become larger.
In being normally applied system, currently used recognition methods is: upon power-up of the system, first sweeping one for touch key-press
Group conversion value chooses suitable threshold value according to the class value, then sets good threshold, at this time in order to meet the needs of low-power consumption, one
As require system to enter low-power consumption mode, while the detection work of touch key-press carries out always, when having detected touch behavior
It is normal since waking up system under low-power consumption mode when (touch key-press conversion value is higher than given threshold), one group is then swept again
The capacitor conversion values of membrane keyboard identify which specific key is touched according to this class value, then execute corresponding operating.
In above-mentioned application scenarios, it requires to be the behavior that cannot have touch when system electrification, otherwise just will appear
System cannot be waken up after entering low-power consumption by touch action, and subsequent touch action also cannot identified situation.Cause
Touch behavior when to power on, will lead to the threshold value set for the first time is the value that key is under touch condition, is entered in system low
After power consumption, it is difficult the behavior (threshold value is capacitor conversion values when touching at this time) that key range again is touched, such system is just
It can be constantly in low-power consumption mode, the meaning of its application cannot be lost by the touch behavioral arousal of key.
For the problems in the relevant technologies, currently no effective solution has been proposed.
Summary of the invention
For above-mentioned technical problem in the related technology, the present invention proposes that a kind of solution touch key-press can not identify that touch is dynamic
The method and its touch recognition system of work, when can reach even under touch condition, the touch behavior after powering on also can quilt
The effect normally identified.
To realize the above-mentioned technical purpose, the technical scheme of the present invention is realized as follows:
A method of touch action can not be identified by solving touch key-press, comprising the following steps:
S1 gives system electrification, and system takes multiple scan touch key-press, sets out suitable high threshold VH and Low threshold
VL；
S2, system enter low-power consumption mode, continue to test touch key-press to determine whether wake-up system；
S3, system enter normal mode after being waken up, and distinguish the capacitor conversion value by scanning to touch key-press
It is compared with high threshold VH and Low threshold VL to judge in a manner of system wake-up；
S4 identifies which specific key is touched and comprehensive analysis goes out to touch if system wakes up since finger touches
Behavior, then execute and specific touch behavior operation；
S5 takes multiple scan touch key-press if system wakes up since finger is taken away, and sets out new more suitable
High threshold and Low threshold, enter step S2.
Preferably, step S1 further comprises:
S11 gives system electrification；
S12, Multiple-Scan touch key-press is corresponding to obtain multiple groups conversion value, takes maximum value Vhigh therein and minimum value
VH and VL is calculated according to certain algorithm in Vlow；
S13 sets VH as high threshold, and VL is Low threshold.
Preferably, when being under touch condition, then the larger conversion value when threshold value set is touches is non-tactile when being in
Smaller conversion value under state, then when the threshold value set is no touch.
Preferably, step S3 further comprises:
S31, system enter normal mode of operation after being waken up, and scan to obtain one group of capacitor conversion first to touch key-press
Value, it is assumed that be VA；
S32 compares VA and the high-low threshold value of setting, and when VA is greater than VH, explanation is waken up since finger touches
System；And when VA is less than VL, explanation is to have waken up system since finger is taken away.
Preferably, step S4 further comprises:
S41 needs after being judged as has finger touch key-press for each key scan, for identify it is specific which
Key is touched；
S42, after recognizing the touch of specific key, comprehensive analysis goes out the behavior type touched；
S43 executes specific touch behavior operation.
Preferably, the behavior type of the touch includes short-press, long-pressing and sliding.
Preferably, it when identifying in the normal mode less than the behavior of touch, to meet low-power consumption demand, then to enter step
S2, into low power mode of operation.
Preferably, step S5 further comprises:
S51 has waken up system because finger takes away when being judged as, in the state of no touch, continuous several times has been needed to scan
Touch key-press, obtains enough capacitor conversion values, chooses peak and minimum, and be calculated new more suitable VH with
VL；
High-low threshold value is respectively set as new VH and VL, enters step S2 by S52.
It is a kind of to identify the touch recognition system of touch action, including control chip, touch for solving touch key-press
Circuit, ADC conversion circuit, high threshold decision circuitry, Low threshold decision circuitry and the logic sum gate for exporting touch signal；The touching
Circuit is touched to be connected with the ADC conversion circuit, the ADC conversion circuit respectively with the high threshold decision circuitry and Low threshold
Decision circuitry is connected, and the high threshold decision circuitry and Low threshold decision circuitry are connected with the logic sum gate, described
Logic sum gate is connected by conducting wire with the control chip, wherein the ADC conversion circuit is to by the mould on touch key-press
Quasi- signal is converted to digital signal, is further processed convenient for digital circuit；The high threshold decision circuitry is to convert electricity for ADC
The digital value of road conversion is compared judgement with the high threshold set, when the digital value of ADC conversion circuit conversion is higher than high threshold
When value, touch recognition signal is generated；The Low threshold decision circuitry to the digital value of converting ADC conversion circuit with set
Low threshold be compared judgement, when ADC conversion circuit conversion digital value be lower than Low threshold when, generate touch recognition signal.
Further, the high threshold decision circuitry and Low threshold decision circuitry include that numerical value comparison module and threshold value are posted
Storing module.
Beneficial effects of the present invention: by realizing the arousal function of two kinds of threshold values when realizing touch detection control circuit,
Respectively high threshold wakes up and Low threshold wakes up, meet be greater than high threshold or lower than Low threshold condition when can wake up and be
System, in this way after powering under key is in touch condition, is arranged suitable Low threshold, and then system enters low-power consumption mode, when
After key finger unclamps, the conversion value of scanning is lower than the Low threshold set, so that it may which then normal wakeup system starts normal
Identification operates, to solve the problems, such as that touch-control identifying system is constantly in low power consumpting state and cannot be waken up.
Touch recognition system of the present invention, the identification of touch action is realized using the judgment method of two threshold values,
Touch signal is generated when capacitor conversion value is greater than high threshold or lower than Low threshold, the capacitor on such touch key-press increases
Or capacitor becomes smaller and can be correctly validated out.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is touch key-press working principle diagram described in background technique according to the present invention；
Fig. 2 is described according to embodiments of the present invention can not to identify the touch recognition of touch action for solving touch key-press
The structural schematic diagram of system；
Fig. 3 is that the key of the embodiment of the present invention is in the scene figure that works on power of touch condition；
Fig. 4 is that the key of the embodiment of the present invention is in the scene figure that works on power of non-tactile state；
Fig. 5 is the stream for the method that a kind of solution touch key-press described according to embodiments of the present invention can not identify touch action
Cheng Tu.
In figure: 1, touch circuit；2, chip is controlled；3, ADC conversion circuit；4, Low threshold decision circuitry；5, high threshold is sentenced
Deenergizing；6, logic sum gate.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art's every other embodiment obtained belong to what the present invention protected
Range.
As shown in Figs. 1-5, a kind of solution touch key-press according to embodiments of the present invention can not identify touch action
Method, comprising the following steps:
S1 gives system electrification, and system takes multiple scan touch key-press, sets out suitable high threshold VH and Low threshold
VL；
S2, system enter low-power consumption mode, continue to test touch key-press to determine whether wake-up system；
S3, system enter normal mode after being waken up, and distinguish the capacitor conversion value by scanning to touch key-press
It is compared with high threshold VH and Low threshold VL to judge in a manner of system wake-up；
S4 identifies which specific key is touched and comprehensive analysis goes out to touch if system wakes up since finger touches
Behavior, then execute and specific touch behavior operation；
S5 takes multiple scan touch key-press if system wakes up since finger is taken away, and sets out new more suitable
High threshold and Low threshold, enter step S2.
Preferably, step S1 further comprises:
S11 gives system electrification；
S12, Multiple-Scan touch key-press is corresponding to obtain multiple groups conversion value, takes maximum value Vhigh therein and minimum value
VH and VL is calculated according to certain algorithm in Vlow；
S13 sets VH as high threshold, and VL is Low threshold.
Preferably, when being under touch condition, then the larger conversion value when threshold value set is touches is non-tactile when being in
Smaller conversion value under state, then when the threshold value set is no touch.
Preferably, step S3 further comprises:
S31, system enter normal mode of operation after being waken up, and scan to obtain one group of capacitor conversion first to touch key-press
Value, it is assumed that be VA；
S32 compares VA and the high-low threshold value of setting, and when VA is greater than VH, explanation is waken up since finger touches
System；And when VA is less than VL, explanation is to have waken up system since finger is taken away.
Preferably, step S4 further comprises:
S41 needs after being judged as has finger touch key-press for each key scan, for identify it is specific which
Key is touched；
S42, after recognizing the touch of specific key, comprehensive analysis goes out the behavior type touched；
S43 executes specific touch behavior operation.
Preferably, the behavior type of the touch includes short-press, long-pressing and sliding.
Preferably, it when identifying in the normal mode less than the behavior of touch, to meet low-power consumption demand, then to enter step
S2, into low power mode of operation.
Preferably, step S5 further comprises:
S51 has waken up system because finger takes away when being judged as, in the state of no touch, continuous several times has been needed to scan
Touch key-press, obtains enough capacitor conversion values, chooses peak and minimum, and be calculated new more suitable VH with
VL；
High-low threshold value is respectively set as new VH and VL, enters step S2 by S52.
On the other hand, a kind of to identify the touch recognition system of touch action, including control for solving touch key-press
Chip 7, touch circuit 1, ADC conversion circuit 3, high threshold decision circuitry 5, Low threshold decision circuitry 4 and output touch signal
Logic sum gate 6；The touch circuit 1 is connected with the ADC conversion circuit 3, the ADC conversion circuit 3 respectively with the height
Threshold decision circuit 5 is connected with Low threshold decision circuitry 4, the high threshold decision circuitry 5 and Low threshold decision circuitry 4 with
The logic sum gate 6 is connected, and the logic sum gate 6 is connected by conducting wire with the control chip 2.
Wherein, the high threshold decision circuitry 5 and Low threshold decision circuitry 4 include that numerical value comparison module and threshold value are deposited
Module.
The ADC conversion circuit 3 is convenient for digital circuit the analog signal on touch key-press is converted to digital signal
It is further processed；The high threshold decision circuitry 5 is to the digital value for converting ADC conversion circuit 3 and the high threshold set
It is compared judgement, when the digital value that ADC conversion circuit 3 is converted is higher than high threshold, generates touch recognition signal；The low threshold
Value decision circuitry 4 is compared judgement with the Low threshold set to the digital value for converting ADC conversion circuit 3, when ADC turns
When changing the digital value of the conversion of circuit 3 lower than Low threshold, touch recognition signal is generated；The logic sum gate 6 is to by the high threshold
The touch recognition signal or get up that the touch recognition signal that value decision circuitry 5 generates is generated with Low threshold decision circuitry 4, two kinds of feelings
Condition is effective touch recognition signal.
In conclusion by means of above-mentioned technical proposal of the invention, by realizing when realizing touch detection control circuit
The arousal function of two kinds of threshold values, respectively high threshold wake up and Low threshold wakes up, and meet greater than high threshold or are lower than Low threshold
Condition when can wake up system, in this way after powering under key is in touch condition, suitable Low threshold is set, then system
Into low-power consumption mode, after key finger unclamps, the conversion value of scanning is lower than the Low threshold set, so that it may normal wakeup system
Then system starts normally identification and operates, cannot be called out to solve touch-control identifying system and be constantly in low power consumpting state
Awake problem.
Touch controller of the present invention with high-low threshold value judgement, the identification applied to capacitance touch induced key
System realizes the identification of touch action using the judgment method of two threshold values, when capacitor conversion value is greater than high threshold or low
Touch signal is generated when Low threshold, the capacitor on such touch key-press increases or capacitor becomes smaller and can be correctly validated
Out.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of method for solving touch key-press and can not identifying touch action, which comprises the following steps:
S1 gives system electrification, and system takes multiple scan touch key-press, sets out high threshold VH and Low threshold VL；
S2, system enter low-power consumption mode, continue to test touch key-press to determine whether wake-up system；
S3, system enter normal mode after being waken up, make by capacitor conversion value that touch key-press is scanned respectively with height
Threshold value VH and Low threshold VL is compared to judge in a manner of system wake-up；
S4 identifies which specific key is touched and comprehensive analysis goes out the row touched if system wakes up since finger touches
Then to execute specific touch behavior operation；
S5 takes multiple scan touch key-press if system wakes up since finger is taken away, and sets out new high threshold and low threshold
Value, enters step S2.
2. the method according to claim 1 for solving touch key-press and can not identifying touch action, which is characterized in that step S1
Further comprise:
S11 gives system electrification；
S12, Multiple-Scan touch key-press is corresponding to obtain multiple groups conversion value, takes maximum value Vhigh therein and minimum value
Vlow, by the way that VH and VL is calculated；
S13 sets VH as high threshold, and VL is Low threshold.
3. according to claim 2 solve the touch key-press method that can not identify touch action, which is characterized in that when being in
Under touch condition, then larger conversion value when the threshold value that sets is touches, under non-tactile state, then the threshold value that sets as
Smaller conversion value when no touch.
4. the method according to claim 1 for solving touch key-press and can not identifying touch action, which is characterized in that step S3
Further comprise:
S31, system enters normal mode of operation after being waken up, scans to obtain one group of capacitor conversion value first to touch key-press, false
It is set as VA；
S32 compares VA and the high-low threshold value of setting, and when VA is greater than VH, explanation is to have waken up since finger touches and be
System；And when VA is less than VL, explanation is to have waken up system since finger is taken away.
5. the method according to claim 1 for solving touch key-press and can not identifying touch action, which is characterized in that step S4
Further comprise:
S41 is needed for each key scan, after being judged as has finger touch key-press for which specific key identified
It is touched；
S42, after recognizing the touch of specific key, comprehensive analysis goes out the behavior type touched；
S43 executes specific touch behavior operation.
6. the method according to claim 5 for solving touch key-press and can not identifying touch action, which is characterized in that the touching
The behavior type touched includes short-press, long-pressing and sliding.
7. the method according to claim 5 that certainly touch key-press can not identify touch action, which is characterized in that in normal mode
When identification is less than the behavior of touch under formula, to meet low-power consumption demand, then S2 is entered step, into low power mode of operation.
8. the method according to claim 1 for solving touch key-press and can not identifying touch action, which is characterized in that step S5
Further comprise:
S51 has waken up system because finger takes away when being judged as, in the state of no touch, continuous several times scanning is needed to touch
Key obtains enough capacitor conversion values, chooses peak and minimum, and new VH and VL is calculated；
High-low threshold value is respectively set as new VH and VL, enters step S2 by S52.
9. a kind of can not identify the touch recognition system of touch action for solving touch key-press, which is characterized in that including control
Chip, touch circuit, ADC conversion circuit, high threshold decision circuitry, Low threshold decision circuitry and export touch signal logic or
Door；The touch circuit is connected with the ADC conversion circuit, and the ADC conversion circuit judges electricity with the high threshold respectively
Road is connected with Low threshold decision circuitry, the high threshold decision circuitry and Low threshold decision circuitry with the logic sum gate phase
Connection, the logic sum gate are connected by conducting wire with the control chip, wherein the ADC conversion circuit will be will touch
Analog signal on key is converted to digital signal, is further processed convenient for digital circuit；The high threshold decision circuitry to
The digital value that ADC conversion circuit is converted is compared judgement with the high threshold set, when the number of ADC conversion circuit conversion
When value is higher than high threshold, touch recognition signal is generated；The Low threshold decision circuitry is to the number of converting ADC conversion circuit
It is worth and is compared judgement with the Low threshold set, when the digital value of ADC conversion circuit conversion is lower than Low threshold, generates touch
Identification signal.
10. according to claim 9 can not identify the touch recognition system of touch action for solving touch key-press, special
Sign is that the high threshold decision circuitry and Low threshold decision circuitry include numerical value comparison module and threshold value registration module.
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| US10121053B2 (en) * | 2016-11-28 | 2018-11-06 | Himax Technologies Limited | Touch device and waking up method thereof |
| CN115009185A (en) * | 2022-06-10 | 2022-09-06 | 中国第一汽车股份有限公司 | A safety belt, method, device and vehicle with touch button function |
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| FR2927710B1 (en) * | 2008-02-18 | 2011-04-15 | Legrand France | TOUCH INTERFACING METHOD AND DEVICE |
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| CN103116424A (en) * | 2011-11-16 | 2013-05-22 | 飞思卡尔半导体公司 | Touch tablet capacitance-type sensor circuit |
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