CN102243554A - Control method and control circuit for determining touch detection mode of touch panel - Google Patents
Control method and control circuit for determining touch detection mode of touch panel Download PDFInfo
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- CN102243554A CN102243554A CN201010180469XA CN201010180469A CN102243554A CN 102243554 A CN102243554 A CN 102243554A CN 201010180469X A CN201010180469X A CN 201010180469XA CN 201010180469 A CN201010180469 A CN 201010180469A CN 102243554 A CN102243554 A CN 102243554A
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- contact panel
- capacitance
- detection mode
- testing result
- sweep frequency
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Abstract
The invention provides a control method applied to a touch panel and used for determining the touch detection mode of the touch panel, and the method comprises the following steps: detecting a capacitance value corresponding to the touch panel by using a first scanning frequency so as to generate a first detection result; detecting a capacitance value corresponding to the touch panel by using a second scanning frequency so as to generate a second detection result, wherein the second scanning frequency is different from the first scanning frequency; and determining whether to adjust the touch detection mode of the touch panel according to the first detection result and the second detection result. The invention also provides a control circuit which is applied to a touch panel and used for determining the touch detection mode of the touch panel. By using the control method and control circuit provided by the invention, the touch detection mode of the touch panel can be adjusted to the optimal touch detection mode no matter whether a user and the touch panel have a shared ground potential, thereby further enhancing the accuracy and stability of touch detection.
Description
Technical field
The present invention relates to the controlling mechanism of contact panel, be specifically related to a kind of control method and relevant control circuit that is used to determine the touching detection mode of contact panel.
Background technology
The mode of operation of contact panel is because simple and easy use, thereby in hand-held device market now, have a wide range of applications, yet general hand-held device can have or not and contacts on the susceptibility of touch-control difference to some extent with the user in use because of installing body own.For instance, please refer to Fig. 1 and Fig. 2, Fig. 1 is the operation chart of user when handing contact panel 100, and Fig. 2 is the schematic equivalent circuit of user when handing contact panel 100.As shown in Figure 1, contact panel 100 can detect corresponding capacitance variation by touch-control electrode 110, and as shown in Figure 2, touch-control electrode 110 only detects capacitor C
2, and stray capacitance C
3Because on the common earthing potential (common ground) of user and contact panel 100, detect so can not have influence on the touching of contact panel 100.Yet, when the user does not contact with contact panel 100, stray capacitance C
3Then can cause inconvenience or the erroneous judgement of contact panel 100 on touching detects.
Please refer to Fig. 3 and Fig. 4, the operation chart when Fig. 3 does not contact with contact panel 100 for the user operates contact panel 100, and the schematic equivalent circuit of Fig. 4 when not contacting with contact panel 100 for the user operates contact panel 100.As shown in Figure 4, touch-control electrode 110 is except having detected capacitor C
2Outside, additionally detect stray capacitance C again
3And the stray capacitance C of corresponding contact panel 100
1, thereby touch-control electrode 110 detected equivalent capacitance value are 1/C1+1/C2+1/C3, rather than the capacitor C shown in Fig. 2
2
Therefore, the meeting of the touching testing mechanism of contact panel 100 touches the user because itself body has or not, and detects different equivalent capacitance value, and then has influence on the susceptibility of its touching testing mechanism.
Summary of the invention
Given this, the invention provides a kind of control method of contact panel and touching detection mode that control circuit decides this contact panel of being applied to, to solve the above problems.
According to one embodiment of the present of invention, it provides a kind of control method that is applied to contact panel with the touching detection mode that determines this contact panel, comprise: use first sweep frequency and detect the pairing capacitance of this contact panel, to produce first testing result; Use second sweep frequency and detect pairing this capacitance of this contact panel, to produce second testing result, wherein this second sweep frequency is different from this first sweep frequency; And this touching detection mode that determines whether adjusting this contact panel according to this first testing result and this second testing result.
According to control method of the present invention, in one embodiment, first testing result comprises uses detected first capacitance of first sweep frequency; Second testing result comprises uses detected second capacitance of second sweep frequency; And comprise: the difference of calculating first capacitance and second capacitance according to the step that first testing result and second testing result determine whether adjusting the touching detection mode of contact panel; And the touching detection mode that determines whether adjusting contact panel according to difference.
According to control method of the present invention, in one embodiment, the step that determines whether adjusting the touching detection mode of contact panel according to described difference comprises: whether more described difference falls into preset range; And the touching detection mode that determines whether adjusting contact panel according to described difference.
According to control method of the present invention, in one embodiment, first testing result comprises uses detected first capacitance of first sweep frequency; Second testing result comprises uses detected second capacitance of second sweep frequency; And comprise: calculate the ratio between first capacitance and second capacitance according to the step that first testing result and second testing result determine whether adjusting the touching detection mode of contact panel; And the touching detection mode that determines whether adjusting contact panel according to described ratio.
According to control method of the present invention, in one embodiment, the step that determines whether adjusting the touching detection mode of contact panel according to ratio comprises: whether more described ratio falls into preset range; And when described ratio surpasses described preset range, adjust the touching detection mode of contact panel.
According to another embodiment of the present invention, it provides a kind of control circuit that is applied to contact panel with the touching detection mode that determines this contact panel, comprising: treatment circuit and decision-making circuit.First sweep frequency that is used to this treatment circuit use detects the pairing capacitance of this contact panel, to produce first testing result, and use second sweep frequency and detect the pairing capacitance of this contact panel, to produce second testing result, wherein this second sweep frequency is different from this first sweep frequency.This decision-making circuit is coupled to this treatment circuit, is used for determining whether adjusting according to this first testing result and this second testing result this touching detection mode of this contact panel.
According to control circuit of the present invention, in one embodiment, first testing result comprises uses detected first capacitance of first sweep frequency; Second testing result comprises uses detected second capacitance of second sweep frequency; And decision-making circuit comprises: computing unit is used to calculate the difference of first capacitance and second capacitance; And the decision unit, be coupled to computing unit, be used for determining whether adjusting the touching detection mode of contact panel according to difference.
According to control circuit of the present invention, in one embodiment, the decision unit is whether the described difference of decision falls into preset range, and determines whether adjusting the touching detection mode of contact panel according to described difference.
According to control circuit of the present invention, in one embodiment, first testing result comprises uses detected first capacitance of first sweep frequency; Described second testing result comprises uses detected second capacitance of second sweep frequency; And decision-making circuit comprises: computing unit is used to calculate the ratio between first capacitance and second capacitance; And the decision unit, be coupled to computing unit, be used for the touching detection mode that the described ratio of foundation determines whether adjusting contact panel.
According to control circuit of the present invention, in one embodiment, the decision unit is whether more described ratio falls into preset range, and determines whether adjusting the touching detection mode of contact panel according to described ratio.
Description of drawings
Fig. 1 is the operation chart of user when the handheld touch panel.
Fig. 2 is the schematic equivalent circuit of user when handing this contact panel.
Operation chart when Fig. 3 does not contact with this contact panel for the user operates contact panel.
Schematic equivalent circuit when Fig. 4 does not contact with this contact panel for the user operates contact panel.
Fig. 5 is the synoptic diagram according to the contact panel that comprises control circuit that one embodiment of the present of invention realized.
Fig. 6 is for being applied to the schematic flow sheet of the control method of contact panel according to one embodiment of the present of invention.
Fig. 7 is the control method detected correlation parameter table in test according to one embodiment of the present of invention.
Fig. 8 is the synoptic diagram of another embodiment of step 605 among Fig. 6.
Embodiment
Fig. 5 is the synoptic diagram according to the contact panel that comprises control circuit 501 500 that one embodiment of the present of invention realized.Control circuit 501 is the touching detection modes that are used to determine contact panel 500, and testing circuit 502 is generations of the touch event (touch event) that is used to detect contact panel 500.In present embodiment, control circuit 501 includes but is not limited to treatment circuit 510 and decision-making circuit 520, and wherein decision-making circuit 520 comprises computing unit 521 and decision unit 522; And Fig. 6 is for being applied to the schematic flow sheet of the control method of contact panel according to one embodiment of the present of invention.If can reach identical result substantially, the sequence of steps that does not need necessarily to shine in the flow process shown in Figure 6 is carried out, and step shown in Figure 6 not necessarily will carry out continuously, that is other step also can be inserted wherein; The detail operations step is as described below:
Step 601: with the first sweep frequency F
ADetection is to obtain capacitance C
A
Step 603: with the second sweep frequency F
BDetection is to obtain capacitance C
B
Step 605: detect capacitance C
AWith capacitance C
BRatio C
A/ C
BWhether drop on outside the preset range.If then execution in step 607, otherwise, get back to step 601.
Step 607: the touching detection mode of adjusting contact panel.
Please in the lump with reference to Fig. 5 and Fig. 6.In one embodiment of the present of invention, flow process shown in Figure 6 is carried out by control circuit shown in Figure 5 501.At first, treatment circuit 510 can be used the first sweep frequency F earlier
ADetect contact panel 500 pairing capacitance C
A, to produce the first testing result R
A, then use the second sweep frequency F again
BDetect contact panel 500 pairing capacitance C
B, to produce the second testing result R
B, the second sweep frequency F wherein
BBe different from the first sweep frequency F
AIn the middle of present embodiment, the second sweep frequency F
BBe to be higher than the first sweep frequency F
AA frequency (that is F
A＜F
B).Referring again to Fig. 7, it is the control method detected correlation parameter table in test according to one embodiment of the present of invention.As shown in Figure 7, with the first lower sweep frequency F
AWhen detecting, when user and contact panel 500 have common earthing potential (commonground), its detected capacitance C
A1Be 39, and be total to earthing potential, its detected capacitance C when 500 of user and contact panels
A2Be 37, capacitance does not have obvious variation, and this is that the difference of capacitance can be more not obvious because when scanning with low frequency, thereby reduces for the influence of earthing potential altogether.Yet lower sweep frequency is also being represented the minimizing of touching induction sensitivity simultaneously, therefore, only reduces sweep frequency and can't solve substantive issue effectively.
Referring again to Fig. 7, with the second higher sweep frequency F
BDuring detection, when the user operates in the mode of the body of handheld touch panel 500, that is user and contact panel 500 be when having common earthing potential, its detected capacitance C
B1Be 35, and be total to earthing potential, its detected capacitance C when 500 of user and contact panels
B2Be 24, compared to using the first lower sweep frequency F
AThe time resulting capacitance C
A, the second sweep frequency F
BDetected capacitance C
BCan have or not common earthing potential that bigger capacitance variation is arranged because of user and 500 of contact panels.Thereby spirit of the present invention just is to use the variation of the capacitance of different frequency scanning gained and confirms that user and 500 of contact panels have or not common earthing potential, further to adjust the touching detection mode of contact panel 500.
In this embodiment, treatment circuit 510 is at first used the first sweep frequency F
ADetect the first capacitance C
A1(that is first testing result), then, treatment circuit 510 is used the second sweep frequency F again
BSimilarly detect the second capacitance C
B1(that is second testing result).In the embodiment of Fig. 7, suppose that 500 of user and contact panels have common earthing potential, the first capacitance C
A1=39, and the second capacitance C
B1=35.Computing unit 521 can then calculate the first capacitance C
A1With the second capacitance C
B1Ratio C
A1/ C
B1(in this example, ratio C
A1/ C
B1Be about 1.11).Then, decision unit 522 can the decision ratio C
A1/ C
B1Whether fall into preset range, and judge ratio C
A1/ C
B1Whether surpass this preset range, whether adjust the touching detection mode of contact panel 500 with decision.For instance, in this embodiment, this preset range is 0.75～1.25, every ratio that drops in this preset range, promptly represent contact panel 500 detected capacitance variation amount in two different sweep frequencies little, therefore user and 500 of contact panels have common earthing potential as can be known, so contact panel 500 just can be adjusted to suitable touching detection mode in decision unit 522.
Suppose that after a period of time the user no longer operates in the mode of the body of handheld touch panel 500, that is as 500 of user and contact panels altogether during earthing potential, the first capacitance C
A2=37, and the second capacitance C
B2=24.Computing unit 521 can then calculate the first capacitance C
A2With the second capacitance C
B2Ratio C
A2/ C
B2(in this example, ratio C
A2/ C
B2Be about 1.54).In this example, ratio C can be judged in decision unit 522
A1/ C
B1Surpassed this preset range (that is 0.75～1.25), thereby its touching detection mode is adjusted in decision.For instance, the gain that contact panel 500 can be selected temporarily to downgrade its sweep frequency, strengthen testing circuit 502 in the contact panel 500, or the accurate position of the judgement that downgrades testing circuit 502, to improve when the user is total to earthing potential with 500 of contact panels testing circuit 502 detected signal intensities.
Yet the foregoing description only is the usefulness of explanation, is not to be used as to limit the scope of the invention, and for instance, computing unit 521 also can change into and calculate the first capacitance C
AWith the second capacitance C
BDifference C
A-C
B, and difference C also can be judged in decision unit 522
A-C
BWhether fall into and decide touching detection mode how to adjust contact panel 500 in the preset range, shown in the step 805 of Fig. 8, it, and the variation in this design also falls within the scope of the present invention if being the synoptic diagram of another embodiment of step 605 among Fig. 6.
In sum, the invention provides a kind of simple and easy and accurate control method decides the touching detection mode of contact panel, no matter it can be when user and contact panel have or not common earthing potential, all contact panel can be adjusted to best touching detection mode, and then promote accuracy and degree of stability that touching detects.
The above only is preferred embodiment of the present invention, and all equivalent variations and modifications of doing according to claim of the present invention all should belong to covering scope of the present invention.
The main element symbol description
100,500 contact panels, 110 touch-control electrodes
501 control circuits, 502 testing circuits
510 treatment circuits, 520 decision-making circuits
521 computing units, 522 decision unit
C
1, C
2, C
3Electric capacity.
Claims (10)
1. control method that is applied to contact panel with the touching detection mode that determines described contact panel comprises:
Use first sweep frequency and detect the pairing capacitance of described contact panel, to produce first testing result;
Use second sweep frequency and detect the pairing described capacitance of described contact panel, to produce second testing result, wherein said second sweep frequency is different from described first sweep frequency; And
Determine whether adjusting the described touching detection mode of described contact panel according to described first testing result and described second testing result.
2. control method according to claim 1, wherein, described first testing result comprises uses detected first capacitance of described first sweep frequency; Described second testing result comprises uses detected second capacitance of described second sweep frequency; And comprise according to the step that described first testing result and described second testing result determine whether adjusting the described touching detection mode of described contact panel:
Calculate the difference of described first capacitance and described second capacitance; And
Determine whether adjusting the described touching detection mode of described contact panel according to described difference.
3. control method according to claim 2, wherein, the step that determines whether adjusting the described touching detection mode of described contact panel according to described difference comprises:
Whether more described difference falls into preset range; And
Determine whether adjusting the described touching detection mode of described contact panel according to described difference.
4. control method according to claim 1, wherein, described first testing result comprises uses detected first capacitance of described first sweep frequency; Described second testing result comprises uses detected second capacitance of described second sweep frequency; And comprise according to the step that described first testing result and described second testing result determine whether adjusting the described touching detection mode of described contact panel:
Calculate the ratio between described first capacitance and described second capacitance; And
Determine whether adjusting the described touching detection mode of described contact panel according to described ratio.
5. control method according to claim 4, wherein, the step that determines whether adjusting the described touching detection mode of described contact panel according to described ratio comprises:
Whether more described ratio falls into preset range; And
When described ratio surpasses described preset range, adjust the described touching detection mode of described contact panel.
6. control circuit that is applied to contact panel with the touching detection mode that determines described contact panel comprises:
Treatment circuit, be used to use first sweep frequency and detect the pairing capacitance of described contact panel, to produce first testing result, and use second sweep frequency and detect the pairing capacitance of described contact panel, to produce second testing result, wherein said second sweep frequency is different from described first sweep frequency; And
Decision-making circuit is coupled to described treatment circuit, is used for the described touching detection mode that described first testing result of foundation and described second testing result determine whether adjusting described contact panel.
7. control circuit according to claim 6, wherein, described first testing result comprises uses detected first capacitance of described first sweep frequency; Described second testing result comprises uses detected second capacitance of described second sweep frequency; And described decision-making circuit comprises:
Computing unit is used to calculate the difference of described first capacitance and described second capacitance; And
The decision unit is coupled to described computing unit, is used for the described touching detection mode that the described difference of foundation determines whether adjusting described contact panel.
8. control circuit according to claim 7, wherein, described decision unit is whether the described difference of decision falls into preset range, and determines whether adjusting the described touching detection mode of described contact panel according to described difference.
9. control circuit according to claim 6, wherein, described first testing result comprises uses detected first capacitance of described first sweep frequency; Described second testing result comprises uses detected second capacitance of described second sweep frequency; And described decision-making circuit comprises:
Computing unit is used to calculate the ratio between described first capacitance and described second capacitance; And
The decision unit is coupled to described computing unit, is used for the described touching detection mode that the described ratio of foundation determines whether adjusting described contact panel.
10. control circuit according to claim 9, wherein, described decision unit is whether more described ratio falls into preset range, and determines whether adjusting according to described ratio
The described touching detection mode of described contact panel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010180469 CN102243554B (en) | 2010-05-14 | 2010-05-14 | Control method and control circuit for determining touch detection mode of touch panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010180469 CN102243554B (en) | 2010-05-14 | 2010-05-14 | Control method and control circuit for determining touch detection mode of touch panel |
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| Publication Number | Publication Date |
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| CN102243554A true CN102243554A (en) | 2011-11-16 |
| CN102243554B CN102243554B (en) | 2013-08-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010180469 Expired - Fee Related CN102243554B (en) | 2010-05-14 | 2010-05-14 | Control method and control circuit for determining touch detection mode of touch panel |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103197809A (en) * | 2012-01-06 | 2013-07-10 | 义隆电子股份有限公司 | Method for detecting non-common ground of touch panel |
| CN103309501A (en) * | 2013-01-11 | 2013-09-18 | 友达光电股份有限公司 | Method and system for controlling display driving chip by using touch sensing chip |
| CN103970381B (en) * | 2013-02-04 | 2017-12-29 | 联想(北京)有限公司 | Capacitive touch screen and the information processing method for it |
| CN111610872A (en) * | 2019-02-26 | 2020-09-01 | 敦泰电子有限公司 | Touch control method, circuit system and touch device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101339480A (en) * | 2008-08-26 | 2009-01-07 | 友达光电股份有限公司 | Projection type capacitance touch control device and method for recognizing different contact position |
| CN101661359A (en) * | 2009-10-10 | 2010-03-03 | 友达光电股份有限公司 | Capacitance type touch detection system and detection signal-receiving and waveform-shaping module thereof |
-
2010
- 2010-05-14 CN CN 201010180469 patent/CN102243554B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101339480A (en) * | 2008-08-26 | 2009-01-07 | 友达光电股份有限公司 | Projection type capacitance touch control device and method for recognizing different contact position |
| CN101661359A (en) * | 2009-10-10 | 2010-03-03 | 友达光电股份有限公司 | Capacitance type touch detection system and detection signal-receiving and waveform-shaping module thereof |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103197809A (en) * | 2012-01-06 | 2013-07-10 | 义隆电子股份有限公司 | Method for detecting non-common ground of touch panel |
| CN103197809B (en) * | 2012-01-06 | 2016-01-06 | 义隆电子股份有限公司 | Method for detecting non-common ground of touch panel |
| CN103309501A (en) * | 2013-01-11 | 2013-09-18 | 友达光电股份有限公司 | Method and system for controlling display driving chip by using touch sensing chip |
| CN103309501B (en) * | 2013-01-11 | 2016-02-10 | 友达光电股份有限公司 | Method and system for controlling display driving chip by using touch sensing chip |
| CN103970381B (en) * | 2013-02-04 | 2017-12-29 | 联想(北京)有限公司 | Capacitive touch screen and the information processing method for it |
| CN111610872A (en) * | 2019-02-26 | 2020-09-01 | 敦泰电子有限公司 | Touch control method, circuit system and touch 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 |
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| Publication number | Publication date |
|---|---|
| CN102243554B (en) | 2013-08-21 |
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