CN101587406B - Signal screening method of touch device - Google Patents
Signal screening method of touch device Download PDFInfo
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- CN101587406B CN101587406B CN2008101087350A CN200810108735A CN101587406B CN 101587406 B CN101587406 B CN 101587406B CN 2008101087350 A CN2008101087350 A CN 2008101087350A CN 200810108735 A CN200810108735 A CN 200810108735A CN 101587406 B CN101587406 B CN 101587406B
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Abstract
The invention discloses a signal screening method of a touch device. The method comprises the following steps: acquiring a touch signal; acquiring signal intensity values corresponding to a first induction area, a second induction area and a third induction area according to the touch signal, wherein the second induction area is positioned between the first induction area and the third induction area; and if the signal intensity value of the second induction area is less than the signal intensity values of the first induction area and the third induction area, removing the touch signal. The signal screening method can remove noise of the signal so as to improve the accuracy and the stability of a capacitance touch device.
Description
Technical field
The invention relates to a kind of signal screening method, and particularly relevant for removing the method for capacitive touch device because of the noise that source of radio-frequency interference or environmental factor produced.
Background technology
For making portable information products have more humane use interface, integrated touch panel (Touchpanel) or touch pad (Touch pad) are luxuriant to be trend.The relevant big factory of panel, IC design corporation all classify the technology of touch panel as main development project, relevant technology and product also have been applied in the electronic product of daily life, for example information products such as mobile phone, computer and individual action assistant.
The contactor control device of the most normal use at present mainly is divided into resistance-type (resistive) and condenser type (capacitive), and wherein capacitive touch device groundwork principle is a kind of electric characteristics that is called electric capacity of induction.When two-layer electrical conduction object is not touched and is adjacent to each other, their the electric field formation electric capacity that will interact.Levels surface in the touch pad structure is respectively the formed conductive layer of electrode circuit by alternate directions.Finger also is an electrical conductor, when finger is placed on the Trackpad, will form a minimum electric capacity between the electrode circuit of Trackpad and finger.Detect the position that the user touches by the capacitance change by microprocessor.
The influence that is subjected to environmental change owing to capacitive touch device easily produces noise, for example the change of high frequency interference source, temperature or static discharge etc.Therefore, capacitive touch device can produce abnormal induced signal (noise), makes electronic installation produce the waste of judging by accident and causing power supply.
Summary of the invention
The invention provides a kind of signal screening method, when the signal intensity of peripheral region during greater than the signal intensity of zone line, then it is considered as noise and removes, the noise that reduces source of radio-frequency interference or environmental factor whereby and produced, and improve the accuracy and the degree of stability of capacitive touch device.
Hold above-mentionedly, the present invention proposes a kind of signal screening method, is applicable to a contactor control device, and above-mentioned contactor control device comprises a plurality of induction regions, and above-mentioned signal screening method comprises the following steps: at first, obtains a touching signal; Obtain the signal strength values that corresponds to one first induction region, one second induction region and one the 3rd induction region according to above-mentioned touching signal, wherein above-mentioned second induction region is between above-mentioned first induction region and above-mentioned the 3rd induction region; And, if the signal strength values of above-mentioned second induction region then removes above-mentioned touching signal less than the signal strength values of above-mentioned first induction region and above-mentioned the 3rd induction region.
The present invention proposes a kind of signal screening method in addition, is applicable to a contactor control device, and above-mentioned contactor control device comprises a plurality of induction regions, and above-mentioned signal screening method comprises the following steps: at first, obtains the touching signal that above-mentioned contactor control device is exported; Obtain the signal strength values that corresponds to one first induction region, a plurality of second induction region and one the 3rd induction region according to above-mentioned touching signal, wherein above-mentioned second induction region is between above-mentioned first induction region and above-mentioned the 3rd induction region and separate above-mentioned first induction region and above-mentioned the 3rd induction region; And, if the signal strength values of above-mentioned second induction region then removes above-mentioned touching signal all less than the signal strength values of above-mentioned first induction region and above-mentioned the 3rd induction region.
From another perspective, the present invention proposes a kind of signal screening method again, is applicable to a contactor control device, and above-mentioned contactor control device comprises a plurality of induction regions, above-mentioned signal screening method comprises the following steps: at first, obtains the touching signal that above-mentioned contactor control device is exported; Obtain the signal strength values that corresponds to a plurality of first induction regions and a plurality of second induction regions according to above-mentioned touching signal, wherein above-mentioned first induction region is positioned at the periphery of above-mentioned second induction region; And, if the signal strength values of above-mentioned second induction region then removes above-mentioned touching signal all less than the signal strength values of above-mentioned first induction region.
In an embodiment of the present invention, wherein judging whether to remove in the step of above-mentioned touching signal, comprise that also the signal strength values of above-mentioned second induction region and the signal strength values of above-mentioned first induction region need differ by more than a preset value, and above-mentioned preset value is a non-zero real.
In an embodiment of the present invention, wherein judging whether to remove in the step of above-mentioned touching signal, the signal strength values of the signal strength values of above-mentioned second induction region and above-mentioned the 3rd induction region need differ by more than a preset value, and above-mentioned preset value is a non-zero real.
In an embodiment of the present invention, the signal strength values of above-mentioned first induction region, above-mentioned second induction region and above-mentioned the 3rd induction region is respectively by a standardized numeric representation.
In an embodiment of the present invention, above-mentioned contactor control device comprises a contact panel or a touch pad.
In an embodiment of the present invention, above-mentioned contactor control device is a capacitive touch device.
In an embodiment of the present invention, each above-mentioned induction region comprises a capacitive touch control elements.
In an embodiment of the present invention, the position of above-mentioned induction region disposes in the mode of one or nine palace lattice.
In an embodiment of the present invention, the position of above-mentioned induction region is to dispose in honey comb like mode.
In an embodiment of the present invention, the shape of above-mentioned induction region is an arrow shaped.
The present invention is because of coming distinguishing noise and normal signal by the distribution of signal strength values, therefore can be directly realizes that in the mode of software or firmware its implementation cost is low, has commercial application value.In addition, the present invention can directly come mode to come distinguishing noise by identifications such as image, numerical value or look-up tables, and its noise removal effect is good, and can improve the accuracy and the degree of stability of capacitive touch device whereby, reduce the chance of system mistake action, and then reach raising workability and less electricity consumption.
Description of drawings
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated, wherein:
Fig. 1 is noise screening technique process flow diagram according to an embodiment of the invention.
Fig. 2 is noise and corresponding induction region distribution plan according to an embodiment of the invention.
Fig. 3 then is noise and corresponding induction region distribution plan according to another embodiment of the present invention.
Fig. 4 is noise and corresponding induction region distribution plan according to another embodiment of the present invention.
Fig. 5 is the induction region distribution plan of normal signal and noise according to another embodiment of the present invention.
The cellular according to another embodiment of the present invention and sagittate layout type synoptic diagram of Fig. 6.
The main element symbol description:
S110～S150: step
101～109: induction region
Embodiment
When capacitive touch device (for example touch screen or touch pad) produces noise because of source of radio-frequency interference or environmental factor; usually have a plurality of points (induction region) output signal simultaneously; and the phenomenon that induction region has stochastic distribution usually produces, and the variation of its signal intensity can be not regular yet.This is because noise or interference source are also non-linear to the influence of contactor control device, and has the relation of nonanticipating.On the other hand, the touching signal that produces if utilize conductors such as finger or pointer to touch contactor control device can form single-point usually or occurs in the adjacent areas, and the signal intensity of induction region is progressively successively decreased usually from inside to outside or along specific direction.The present invention promptly is an otherness of utilizing above-mentioned noise and the finger signal that produces, removes noise by the distribution of signal strength values.Signal strength values promptly is the signal intensity of the indivedual induction regions numerical value after via standardization, can be used to represent the relative size of the signal intensity of each induction region.
As above-mentioned, when receiving a touching signal, present embodiment can utilize the distribution of the pairing signal strength values of touching signal to judge whether this touching signal is a noise or the signal that the user imported.The touching signal then is to utilize the induction region of contactor control device obtained, is used for representing for example pointing the zone that is contacted.In the present embodiment, the signal strength values of the induction region in the middle of be positioned at is when less (representing that its signal intensity is weak), then its touching signal is considered as noise and removes.
Fig. 1 is signal screening method process flow diagram according to an embodiment of the invention, at first, obtain touching signal (step S110), wherein then for example contact panel, touch pad or touch module etc. of contactor control device, each contactor control device comprises a plurality of induction regions, is used for the touching of finger sensing or conductive body.Then, obtain the signal strength values (step S120) of corresponding induction region according to the touching signal.Under normal circumstances, the induction region of output signal being arranged promptly is that expression has finger or conductive body to touch this induction region.Next, whether the signal strength values of judging the peripheral region greater than the signal strength values of zone line, and differs by more than a preset value (step S130); If then remove this touching signal (step S140); If not, then export this touching signal (step S150).
In above-mentioned steps S130, the place that the distinguishing then of peripheral region and zone line can be taken place according to the layout and the noise of induction region and different.Whether be positioned at than the induction region of center section and the signal strength values that is positioned at peripheral induction region partly but the standard of its judgement all is comparison, differentiating by the distribution of signal strength values is noise.Further specify in step S130 with next several distributions that belong to noise of enumerating, for the mode of distinguishing of noise and normal signal.
Please refer to Fig. 2, Fig. 2 is noise and corresponding induction region distribution plan according to an embodiment of the invention, present embodiment with the contactor control device of endian format configuration be example as an illustration, wherein induction region 101～109 is respectively a capacitance touching control sensing element, its layout shape can change according to design requirement, for example cellular or arrowhead form does not add tired stating at this.At first, please refer to Fig. 2 (a), wherein induction region 101,107 belongs to partly peripheral, part in the middle of the induction region 104 between induction region 101,107 then belongs to.In the present embodiment, the induction region that oblique line is represented, its signal strength values is less, and the induction region of representing with imaginary point, and its signal strength values is bigger, and both differ and surpass a preset value.Shown in Fig. 2 (a), wherein the signal strength values of induction region 104 is less than the signal strength values of induction region 101,107, and differs by more than preset value.The size of preset value is viewable design demand and ordering then, and the little then susceptibility of healing is high more, can be set at non-zero real or preset value is made as zero.
With the example explanation, in Fig. 2 (a), making the signal strength values of the induction region 101,104,107 after the standardization is 70,60,70 in regular turn, if setting preset value is 5, then owing to differ 10 between the induction region 101 and 104, and also differ 10 between induction region 107 and 104, both phase phase differences are all greater than preset value (5).Therefore, promptly be regarded as noise corresponding to the touching signal of Fig. 2 (a) and removed.By another angle, if the signal strength values of induction region 101,104,107 is 70,68,70 in regular turn, then this touching signal is a normal signal.
Fig. 2 (a)～Fig. 2 (h) illustrates several signal distributions constitutional diagrams that is considered as noise, in the present embodiment, the induction region of oblique line part (as Fig. 2 (b) 102) signal strength values less, and be positioned at peripheral induction region (the imaginary point part, as Fig. 2 (b) 101 and 103) signal strength values bigger.Because under the normal condition, when using finger or pointer to touch contactor control device, the induction region that is positioned at center section should be able to be experienced stronger or bigger signal value, so Fig. 2 (a)～Fig. 2 (h) may be the touching signal that is caused by noise promptly, so removed.
Fig. 3 then is noise and corresponding induction region distribution plan according to another embodiment of the present invention.With Fig. 3 (a) is example, the pairing induction region of its touching signal is 101,102,105,106, wherein induction region 102,105 is between induction region 101,106, and its signal strength values (oblique line partly) is all less than induction region 101,106 (imaginary point part).Therefore, in the present embodiment, the touching signals of corresponding diagram 3 (a) type promptly is regarded as noise, is removed.Fig. 3 (b)～Fig. 3 (h) is similar to Fig. 3 (a), mainly is the induction region difference that is distributed, but the signal strength values of center section therefore in the present embodiment, all belongs to the category of noise all less than periphery signal strength values partly, is removed.
Fig. 4 is noise and corresponding induction region distribution plan according to another embodiment of the present invention.Fig. 4 (a)～Fig. 4 (d) illustrates the distribution of four kinds of noises respectively, with 4 (c) is example, induction region 102,104,106 and 108 (imaginary point part) is positioned at the periphery of induction region 105 (oblique line partly), and the signal strength values minimum of induction region 105 wherein.Therefore, in the present embodiment, the touching signals of corresponding diagram 4 (c) type promptly is regarded as noise, is removed.Yet, it should be noted that if induction region 102 and 104 signal strength values less than induction region 105 or differ less than preset value, this touches signal can be regarded as normal signal.Fig. 4 (a), Fig. 4 (b) and Fig. 4 (d) are similar to Fig. 4 (c), mainly are the induction region differences that is distributed, but the signal strength values of center section is all less than periphery signal strength values partly, therefore, in the present embodiment, all belong to the category of noise, removed.
Next, further specify the difference of normal signal and noise in the numerical value mode, Fig. 5 is the induction region distribution plan of normal signal and noise according to another embodiment of the present invention.The pairing induction region distribution plan of Fig. 5 (a) expression normal touching signal, Fig. 5 (b) then represents the pairing induction region distribution plan of noise.In Fig. 5 (a), near the induction region of zone line, as 105,104, its signal strength values is respectively 75,55, and is positioned at peripheral induction region, and as 101,107,109, its signal strength values is respectively 40,50,50.The signal strength values of induction region 105,104 is greater than the signal strength values of induction region 101,107,109.Therefore, in the present embodiment, Fig. 5 (a) belongs to the category of normal signal.Review Fig. 5 (b), the signal strength values of induction region 105,108 is respectively 30,40, all less than the signal strength values of the induction region 104,107,106,109 of its adjacent both sides.Therefore, in the present embodiment, Fig. 5 (b) belongs to the category of noise, can be removed.
In addition, it should be noted that in step S130, can be relatively the signal strength values of induction region and middle induction region around all, also can choose wantonly and be positioned at two peripheral induction regions and the induction region of its centre compares, present embodiment is not limited.Just comparison condition is more rigorous, and the effect of its noise removal is better, and comparison condition is looser, and its computing velocity is faster, and the expensive source of institute is less.As for mode relatively, present embodiment can adopt for example image identification, numerical analysis or mode such as table look-up, and present embodiment is not limited.In addition, if touch signal only corresponding to single induction region, or two adjacent induction regions, then in this enforcement, this touching signal can be regarded as normal signal.
Moreover, though above-mentioned Fig. 2～Fig. 5 enumerates the induction region distribution plan of several noises or normal signal, but present embodiment is not as limit, the present technique field has the induction region distribution plan of knowing that usually the knowledgeable should analogize all the other noises or normal signal easily via announcement of the present invention, does not add tired stating at this.Same, present embodiment also is not restricted to the induction region configuration mode of nine palace lattice, utilize the contactor control device of other layout type to be equally applicable to present embodiment, as shown in Figure 6, the cellular according to another embodiment of the present invention layout type of Fig. 6 (a), Fig. 6 (b) is the arrow shaped layout type according to another embodiment of the present invention.Utilize the contactor control device of other layout type to be equally applicable to present embodiment, do not add tired stating at this.
In sum, the change in signal strength that the present invention utilizes noise and normal signal to be produced removes noise, reduces the influence to electronic installation of source of radio-frequency interference, environmental factor.Whereby, not only can improve the accuracy and the degree of stability of capacitive touch device, more can reduce the chance of system's misoperation, and then reach raising workability and less electricity consumption.
Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little modification and perfect, so protection scope of the present invention is when with being as the criterion that claims were defined.
Claims (13)
1. a signal screening method is applicable to a contactor control device, and this contactor control device comprises a plurality of induction regions, and this method comprises:
Obtain a touching signal;
Obtain the signal strength values that corresponds to one first induction region, one second induction region and one the 3rd induction region according to above-mentioned touching signal, wherein this second induction region is between this first induction region and the 3rd induction region; And
If the signal strength values of this second induction region then removes this touching signal less than the signal strength values of this first induction region and the 3rd induction region.
2. signal screening method as claimed in claim 1, it is characterized in that, judging whether to remove in the step of this touching signal, if the signal strength values of this second induction region is less than the signal strength values of this first induction region, and the signal strength values of the signal strength values of this second induction region and this first induction region differs by more than a preset value, just remove this touching signal, this preset value is a non-zero real.
3. signal screening method as claimed in claim 1, it is characterized in that, judging whether to remove in the step of this touching signal, if the signal strength values of this second induction region is less than the signal strength values of the 3rd induction region, and the signal strength values of the signal strength values of this second induction region and the 3rd induction region differs by more than a preset value, just remove this touching signal, this preset value is a non-zero real.
4. signal screening method as claimed in claim 1 is characterized in that, respectively this signal strength values of this first induction region, this second induction region and the 3rd induction region is respectively with the numeric representation after the standardization.
5. signal screening method as claimed in claim 1 is characterized in that, this contactor control device comprises a contact panel, a touch pad or a capacitive touch device.
6. signal screening method as claimed in claim 1 is characterized in that, each those induction region comprises a capacitive touch control elements.
7. signal screening method as claimed in claim 1 is characterized in that, the position of those induction regions disposes with one or nine palace lattice or a honey comb like mode.
8. signal screening method as claimed in claim 1 is characterized in that, those induction regions be shaped as arrow shaped.
9. a signal screening method is applicable to a contactor control device, and this contactor control device comprises a plurality of induction regions, and this signal screening method comprises:
Obtain the touching signal that this contactor control device is exported;
Obtain the signal strength values that corresponds to one first induction region, a plurality of second induction region and one the 3rd induction region according to above-mentioned touching signal, wherein those second induction regions are between this first induction region and the 3rd induction region and separate this first induction region and the 3rd induction region; And
If the signal strength values of those second induction regions then removes this touching signal all less than the signal strength values of this first induction region and the 3rd induction region.
10. signal screening method as claimed in claim 9, it is characterized in that, judging whether to remove in the step of this touching signal, if the signal strength values of those second induction regions is all less than the signal strength values of this first induction region, and the signal strength values of the signal strength values of those second induction regions and this first induction region all differs by more than a preset value, just remove this touching signal, and this preset value is a non-zero real.
11. signal screening method as claimed in claim 9, it is characterized in that, judging whether to remove in the step of this touching signal, if the signal strength values of those second induction regions is all less than the signal strength values of the 3rd induction region, and the signal strength values of the signal strength values of those second induction regions and the 3rd induction region all differs by more than a preset value, just remove this touching signal, and this preset value is a non-zero real.
12. a signal screening method is applicable to a contactor control device, this contactor control device comprises a plurality of induction regions, and this signal screening method comprises:
Obtain the touching signal that this contactor control device is exported;
Obtain the signal strength values that corresponds to a plurality of first induction regions and a plurality of second induction regions according to above-mentioned touching signal, wherein those first induction regions are positioned at the periphery of those second induction regions; And
If the signal strength values of each second induction region then removes this touching signal all less than the signal strength values of each first induction region.
13. signal screening method as claimed in claim 12, it is characterized in that, judging whether to remove in the step of this touching signal, if the signal strength values of each second induction region is all less than the signal strength values of each first induction region, and the signal strength values of the signal strength values of each second induction region and each first induction region all differs by more than a preset value, just remove this touching signal, and this preset value is a non-zero real.
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| CN2008101087350A CN101587406B (en) | 2008-05-23 | 2008-05-23 | Signal screening method of touch device |
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| CN2008101087350A CN101587406B (en) | 2008-05-23 | 2008-05-23 | Signal screening method of touch device |
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| CN101587406B true CN101587406B (en) | 2011-06-29 |
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| TWI460632B (en) * | 2012-08-21 | 2014-11-11 | Au Optronics Corp | Method for detecting touch points |
| TWI494810B (en) * | 2013-02-08 | 2015-08-01 | Elan Microelectronics Corp | Touch device and metohd of indentifying touch objects on the touch device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4733222A (en) * | 1983-12-27 | 1988-03-22 | Integrated Touch Arrays, Inc. | Capacitance-variation-sensitive touch sensing array system |
| US5825352A (en) * | 1996-01-04 | 1998-10-20 | Logitech, Inc. | Multiple fingers contact sensing method for emulating mouse buttons and mouse operations on a touch sensor pad |
| CN1956335A (en) * | 2005-10-27 | 2007-05-02 | 盛群半导体股份有限公司 | Adjacent induction device and its induction method |
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- 2008-05-23 CN CN2008101087350A patent/CN101587406B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4733222A (en) * | 1983-12-27 | 1988-03-22 | Integrated Touch Arrays, Inc. | Capacitance-variation-sensitive touch sensing array system |
| US5825352A (en) * | 1996-01-04 | 1998-10-20 | Logitech, Inc. | Multiple fingers contact sensing method for emulating mouse buttons and mouse operations on a touch sensor pad |
| CN1956335A (en) * | 2005-10-27 | 2007-05-02 | 盛群半导体股份有限公司 | Adjacent induction device and its induction method |
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