CN102033667B - Touch sensing device and touch sensing method - Google Patents
Touch sensing device and touch sensing method Download PDFInfo
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- CN102033667B CN102033667B CN 200910176185 CN200910176185A CN102033667B CN 102033667 B CN102033667 B CN 102033667B CN 200910176185 CN200910176185 CN 200910176185 CN 200910176185 A CN200910176185 A CN 200910176185A CN 102033667 B CN102033667 B CN 102033667B
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- 230000003071 parasitic effect Effects 0.000 description 5
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Abstract
A touch sensing device applied to a capacitive touch panel comprises a sensing module, a signal generating module, a comparing module and a processing module. The sensing module generates a request signal when first and second touch points formed on the capacitive touch panel correspond to two first touch pad sets and two second touch pad sets of the capacitive touch panel. The signal generating module respectively outputs two testing signals with opposite phases to the two first touch pad groups according to the request signal. After the comparison module generates a comparison result according to the two voltage values corresponding to the two second touch pad groups, the processing module judges the positions of the first touch point and the second touch point according to the comparison result. When the touch points are more than two, the touch sensing device repeats the steps until the real positions of all the touch points are defined and the false touch points are removed.
Description
Technical field
The present invention relates to a kind of contact panel, especially, relate to a kind of touch sensing device and the sensing method of touch control that can effectively avoid judging by accident with the multi-point touch on the real realization capacitance type touch-control panel.
Background technology
Generally speaking, contact panel is according to the difference of its principle of induction, and it is dissimilar to be broadly divided into resistance-type, condenser type, ultrasonic type, optics (for example infrared ray) formula etc.Wherein, capacitance type touch-control panel is owing to only need touching gently to respond to, and contacting hardly between finger and the contact panel can produce wearing and tearing, stable performance and long service life, so than traditional electric resistance touch-control panel, capacitance type touch-control panel shows more excellent performance really.
Please refer to Figure 1A and Figure 1B, Figure 1A and Figure 1B show traditional touch sensing device 1 and signal input timing figure thereof.Shown in Figure 1A and Figure 1B, the mode that traditional touch-control sniffer 1 adopts timesharing by X-direction to Y direction (also can for by Y direction to X-direction) in proper order by each touch pad X of signal input module 12 input pulse square waves to the contact panel
1～X
6And Y
1～Y
6, the parasitic capacitor variations that produces when measuring objects (for example finger or touch-control nib etc.) touch panel by sensing module 14 again, and then survey user's touch-control action and the position of formed touch point on panel.
Yet, when the user when capacitance type touch-control panel carries out multi-point touch, above-mentioned traditional detection circuit framework and detection method thereof only can detect the scope of a plurality of touch points, and can't judge the position of touch that it is real.For example, when the user arrived capacitance type touch-control panel with two finger touches, traditional detection circuit will detect two parasitic capacitor variations maximal values in X-axis and Y-axis respectively.Yet because these two maximal values can produce by two kinds of different touching modes, the system that makes can't accurately judge, and these are not that really touched point namely is referred to as " false touch point " (ghost point).
Fig. 2 A and Fig. 2 B show the synoptic diagram that traditional touch control sensing circuit is surveyed two touch points.Shown in Fig. 2 A, suppose that user's formed two touch points on contact panel 10 lay respectively at A point and B point, detection circuit will detect two parasitic capacitor variations maximal values in X-axis, also can detect two parasitic capacitor variations maximal values in Y-axis simultaneously.At this moment, actually touch control sensing circuit can't judge that above-mentioned parasitic capacitor variations is produced by being positioned at two touch points that A point and B order, Hai Shi produced by being positioned at and B ' two touch points at A '.These two touch points that are positioned at and among Fig. 2 A at A ' at B ' namely are called false touch point.In like manner, shown in Fig. 2 B, when the user forms when being positioned at two touch points that C point and D order at contact panel 10, namely may produce two false touch points that are positioned at and at C ' at D '.
Therefore, the present invention proposes a kind of touch sensing device and a kind of sensing method of touch control, to address the above problem.
Summary of the invention
A kind of specific embodiment according to the present invention is a kind of touch sensing device.In actual applications, this touch sensing device can be applicable to capacitance type touch-control panel, is formed at the position of at least one touch point on this capacitance type touch-control panel with sensing.This capacitance type touch-control panel comprises along a plurality of first touch pad groups of first direction arrangement and a plurality of second touch pad groups of arranging along second direction.
In this embodiment, this touch sensing device comprises sensing module, signal generator module, comparison module and processing module.First touch point on being formed at this capacitance type touch-control panel and second touch point are during corresponding to two first touch pad groups in these a plurality of first touch pad groups and two second touch pad groups in this a plurality of second touch pad groups, and this sensing module produces request signal.
Then, this signal generator module will be according to this request signal two test signals that output phase is opposite respectively to these two the first touch pad groups.This comparison module measure corresponding to two magnitudes of voltage of these two the second touch pad groups and relatively these two magnitudes of voltage to produce comparative result.This processing module is judged this first touch point and primary importance and the second place of this second touch point on this capacitance type touch-control panel according to this comparative result.
According to this specific embodiment, in touch sensing device, this first direction is perpendicular to this second direction.
According to this specific embodiment, in touch sensing device, these two test signals comprise first test signal and second test signal, respectively by the first specific first touch pad group in these two the first touch pad groups and the second specific first touch pad group input.
Preferably, in this touch sensing device, under special time, if this first test signal is imported for negative edge and this second test signal is positive edge input, then this first test signal and this second test signal are defined as reverse input signal and forward input signal respectively.
Preferably, in this touch sensing device, these two the second touch pad groups comprise the first specific second touch pad group and the second specific second touch pad group, and this first specific second touch pad group is connected to the anode of this comparison module and the negative terminal that this second specific second touch pad group is connected to this comparison module.
Preferably, in this touch sensing device, if first magnitude of voltage in these two magnitudes of voltage for just and second magnitude of voltage for bearing, this comparative result is that first magnitude of voltage deducts second magnitude of voltage greater than zero, and this processing module judges that this first touch point and this second touch point are in first candidate's control mode touch mode.
Preferably, in this touch sensing device, under this first candidate control mode touch mode, this primary importance of this first touch point is corresponding to this first specific first touch pad group and this first specific second touch pad group, and this second place of this second touch point is corresponding to this second specific first touch pad group and this second specific second touch pad group.
Preferably, in this touch sensing device, if first magnitude of voltage in these two magnitudes of voltage for negative and second magnitude of voltage for just, this comparative result deducts second magnitude of voltage less than zero for first magnitude of voltage in these two magnitudes of voltage, and this processing module judges that this first touch point and this second touch point are in second candidate's control mode touch mode.
Preferably, in this touch sensing device, under this second candidate control mode touch mode, this primary importance of this first touch point is corresponding to this second specific first touch pad group and this first specific second touch pad group, and this second place of this second touch point is corresponding to this first specific first touch pad group and this second specific second touch pad group.
In fact, this touch sensing device also may extend to the judgement of multi-point touch, has more than to be confined to 2 points.When touch point number during greater than 2, this touch sensing device can be got wherein 2 judgements respectively, repeats to the actual position that defines all touch points and till removing false touch point.
Another kind of specific embodiment according to the present invention is a kind of sensing method of touch control.This sensing method of touch control is formed at the position of at least one touch point on the capacitance type touch-control panel in order to sensing.Wherein, this capacitance type touch-control panel comprises along a plurality of first touch pad groups of first direction arrangement and a plurality of second touch pad groups of arranging along second direction.
In this embodiment, this sensing method of touch control comprises the following step: (a) whether sensing is formed at first touch point on this capacitance type touch-control panel and second touch point corresponding to two first touch pad groups in these a plurality of first touch pad groups and two second touch pad groups in this a plurality of second touch pad groups; (b) if the sensing result of step (a) is for being to distinguish two opposite test signals of output phase to these two the first touch pad groups; (c) measure corresponding to two magnitudes of voltage of these two the second touch pad groups and relatively these two magnitudes of voltage to produce comparative result; (d) judge this first touch point and primary importance and the second place of this second touch point on this capacitance type touch-control panel according to this comparative result.
According to this specific embodiment, in the method, this first direction is perpendicular to this second direction.
According to this specific embodiment, in the method, these two test signals comprise first test signal and second test signal, respectively by the first specific first touch pad group in these two the first touch pad groups and the second specific first touch pad group input.
Preferably, in the method, under special time, if this first test signal is imported for negative edge and this second test signal is positive edge input, then this first test signal and this second test signal are defined as reverse input signal and forward input signal respectively.
Preferably, in the method, these two the second touch pad groups comprise the first specific second touch pad group and the second specific second touch pad group, and this first specific second touch pad group is connected to the anode of this comparison module and the negative terminal that this second specific second touch pad group is connected to this comparison module.
Preferably, in the method, if first magnitude of voltage in these two magnitudes of voltage for just and second magnitude of voltage for bearing, this comparative result is that first magnitude of voltage deducts second magnitude of voltage greater than zero, and step (d) comprises the following step: judge that this first touch point and this second touch point are in first candidate's control mode touch mode; And determine this primary importance of this first touch point and this second place of this second touch point according to this first candidate control mode touch mode; Wherein this primary importance is corresponding to this first specific first touch pad group and this first specific second touch pad group, and this second place is corresponding to this second specific first touch pad group and this second specific second touch pad group.
Preferably, in the method, if first magnitude of voltage in these two magnitudes of voltage for negative and second magnitude of voltage for just, this comparative result deducts second magnitude of voltage less than zero for first magnitude of voltage in these two magnitudes of voltage, and step (d) comprises the following step: judge that this first touch point and this second touch point are in second candidate's control mode touch mode; And determine this primary importance of this first touch point and this second place of this second touch point according to this second candidate control mode touch mode;
Wherein this primary importance is corresponding to this second specific first touch pad group and this first specific second touch pad group, and this second place is corresponding to this first specific first touch pad group and this second specific second touch pad group.
In fact, this sensing method of touch control also may extend to the judgement of multi-point touch, when touch point number during greater than 2, can get wherein respectively at 2 and repeat to judge with said method, until the actual position that defines all touch points and till removing false touch point.
Can be further understood by the following detailed description and accompanying drawings about the advantages and spirit of the present invention.
Description of drawings
Figure 1A shows traditional capacitive touch sensing device.
Figure 1B shows the control signal input timing figure of traditional capacitive touch sensing device.
Fig. 2 A and Fig. 2 B show the synoptic diagram that traditional touch sensing device is surveyed two touch points.
Fig. 3 shows the functional block diagram according to the touch sensing device of a kind of specific embodiment of the present invention.
Fig. 4 A and B show the synoptic diagram that touch sensing device is surveyed different two touch points respectively.
Fig. 5 shows the process flow diagram according to the sensing method of touch control of a kind of specific embodiment of the present invention.
Embodiment
A kind of specific embodiment of the present invention is a kind of touch sensing device.In this embodiment, this touch sensing device is applied to capacitance type touch-control panel, is formed at the position of at least one touch point on this capacitance type touch-control panel with sensing.In fact, form finger or the touch-control nib that the object of touch point can the person of being to use at capacitance type touch-control panel, but not as limit.
See also Fig. 3, Fig. 3 shows the functional block diagram of touch sensing device in the present embodiment.As shown in Figure 3, touch sensing device 2 comprises sensing module 20, signal generator module 22, comparison module 24 and processing module 26.Wherein, sensing module 20 is connected to signal generator module 22; Comparison module 24 is connected to processing module 26; Signal generator module 22 will produce and export the first test signal S1 and the second test signal S2; Comparison module 24 will receive the first magnitude of voltage Vp and the second magnitude of voltage Vn.
Then, please refer to Fig. 4 A, Fig. 4 A shows the synoptic diagram that touch sensing device 2 among Fig. 3 is applied to capacitance type touch-control panel 3.Shown in Fig. 4 A, capacitance type touch-control panel 3 comprises (6 * 6) individual touch point, six group of first touch pad group Y1～Y6 and six group of second touch pad group X1～X6.In this embodiment, first touch pad group Y1～Y6 of capacitance type touch-control panel 3 arranges along first direction (Y-direction) in regular turn, and second touch pad group X1～X6 arranges along second direction (directions X) in regular turn.Wherein, first direction can be vertical with second direction, but not as limit.Be noted that the touch pad group that capacitance type touch-control panel 3 comprises and the number of touch point are not limited with this example, decide on actual demand.Next, will be for touch sensing device 2 sensing and differentiate the two touch point P1 and the P2 that are formed at capacitance type touch-control panel 3 and be elaborated how.
Shown in Fig. 4 A, the sensing module 20 of touch sensing device 2 is connected to capacitance type touch-control panel 3, the first touch point P1 on being formed at capacitance type touch-control panel 3 and the second touch point P2 are during corresponding to two first touch pad groups among first touch pad group Y1～Y6 and two second touch pad groups among second touch pad group X1～X6, and sensing module 20 will produce request signal.With this embodiment, owing to be formed at the first touch point P1 on the capacitance type touch-control panel 3 corresponding to the first touch pad group Y2 and the second touch pad group X4, and the second touch point P2 is then corresponding to the first touch pad group Y4 and the second touch pad group X1, therefore, sensing module 20 will produce request signal to signal generator module 22.
In this embodiment, signal generator module 22 is connected to sensing module 20 and first touch pad group Y1～Y6.After signal generator module 22 self-inductance measurement modules 20 received request signal, signal generator module 22 was according to the opposite first test signal S1 and second test signal S2 to the first touch pad group Y2 and the Y4 of request signal difference output phase (phase).In fact, signal generator module 22 can be pulse generator, and the first test signal S1 and the second test signal S2 be 22 of the signal generator modules opposite signals of phase place of output synchronously, but not as limit.
In this embodiment, because the second touch pad group X4 is connected to the anode of comparison module 24 and the negative terminal that the second touch pad group X1 is connected to comparison module 24, therefore, comparison module 24 can be respectively receives the first magnitude of voltage Vp and the second magnitude of voltage Vn corresponding to the second touch pad group X4 and X1 from the second touch pad group X4 and X1, and relatively the first magnitude of voltage Vp and the second magnitude of voltage Vn to produce comparative result.In actual applications, comparison module 24 can be comparer, but not as limit.With this embodiment, comparison module 24 deducts the second magnitude of voltage Vn with the first magnitude of voltage Vp and obtains the comparative result of Vp-Vn＞0.
In this embodiment, the first test signal S1 and the second test signal S2 comprise forward input signal and reverse input signal.In fact, the first test signal S1 and the second test signal S2 are that the definition of forward input signal or reverse input signal is positive edge input with the first test signal S1 under special time and the second test signal S2 or bears edge and import relevant actually.
For example, by Fig. 4 A and Fig. 4 B as can be known, as time t=t
0Or t
2The time, because the first test signal S1 imports for negative edge and the second test signal S2 is positive edge input, so the first test signal S1 and the second test signal S2 are defined as reverse input signal and forward input signal respectively.Therefore, the Vp among Fig. 4 A＞0 and Vn＜0 is so comparison module 24 will obtain the comparative result of Vp-Vn＞0.Afterwards, processing module 26 can judge that the first touch point P1 and the second touch point P2 are in first candidate's control mode touch mode according to the comparative result of Vp-Vn＞0, namely the position of the first touch point P1 and the second touch point P2 is respectively (X4, Y2) reach (X1, Y4), but not false touch point (X4, Y4) and (X1, Y2), so can effectively avoid taking place as the situation of erroneous judgement touch point in the prior art.
As for the Vp among Fig. 4 B＜0 and Vn＞0, so comparison module 24 obtains the comparative result of Vp-Vn＜0.Afterwards, processing module 26 can judge that the 3rd touch point P3 and the 4th touch point P4 are in second candidate's control mode touch mode according to the comparative result of Vp-Vn＜0, namely the position of the 3rd touch point P3 and the 4th touch point P4 be respectively (X4, Y4) and (X1, Y2).
The principle of operation of aforesaid way is: signal generator module 22 produces the opposite pulse wave of phase place and imports known two first touch pad group Y2 and the Y4 that the finger contact is arranged respectively, behind finger touch mode capacitive contact panel 3, the first touch pad group of different directions will reduce with phase mutual capacitance between the second touch pad group, therefore, the voltage signal that is coupled to the second touch pad group X4 and X1 will be different, so can tell the actual location of real two touch points thus.
Though it should be noted that above-described embodiment the judgement of 2 pairs of two point touch-controls of touch sensing device only is described, touch sensing device 2 in fact proposed by the invention also may extend to the judgement of multi-point touch, has more than to be confined to 2 points.When the number of touch point during greater than 2, touch sensing device 2 can get respectively wherein that 2 modes with above-described embodiment repeat to judge, until the actual position that defines all touch points and till removing false touch point.
Another kind of specific embodiment according to the present invention is a kind of sensing method of touch control.In this embodiment, this sensing method of touch control is applied to capacitance type touch-control panel, is formed at the position of at least one touch point on this capacitance type touch-control panel with sensing.This capacitance type touch-control panel comprises along a plurality of first touch pad groups of first direction arrangement and a plurality of second touch pad groups of arranging along second direction.In fact, this first direction is perpendicular to this second direction, but not as limit.
See also Fig. 5, Fig. 5 shows the process flow diagram of the sensing method of touch control of present embodiment.As shown in Figure 5, at first, whether this method execution in step S10, sensing are formed at first touch point on this capacitance type touch-control panel and second touch point corresponding to two first touch pad groups in these a plurality of first touch pad groups and two second touch pad groups in this a plurality of second touch pad groups.If the judged result of step S10 is for being that this method execution in step S12 distinguishes two opposite test signals of output phase to these two the first touch pad groups.In fact, these two test signals are the opposite synchronous input signal of phase place.If the judged result of step S10 is that then this method does not re-execute step S10.
Then, this method execution in step S14, measure corresponding to two magnitudes of voltage of these two the second touch pad groups and relatively these two magnitudes of voltage to produce comparative result.Afterwards, this method execution in step S16 judges this first touch point and primary importance and the second place of this second touch point on this capacitance type touch-control panel according to this comparative result.
In this embodiment, these two test signals comprise first test signal and second test signal, respectively by the first specific first touch pad group in these two the first touch pad groups and the second specific first touch pad group input.In fact, this first test signal and this second test signal be actually the forward input signal or oppositely the definition of input signal be positive edge input with this first test signal under special time and this second test signal or bear edge and import relevant, its detailed situation please refer to Fig. 4 A to B and related description, does not give unnecessary details separately at this.
In actual applications, above-mentioned steps S16 may have two kinds of different situations to produce.If this comparative result deducts second magnitude of voltage greater than zero for first magnitude of voltage in these two magnitudes of voltage, step S16 will judge earlier that this first touch point and this second touch point are in first candidate's control mode touch mode, and determines this primary importance of this first touch point and this second place of this second touch point according to this first candidate control mode touch mode.Wherein, this primary importance is corresponding to the first specific second touch pad group in this first specific first touch pad group and these two the second touch pad groups, and this second place is corresponding to the second specific second touch pad group in this second specific first touch pad group and these two the second touch pad groups.
On the contrary, if this comparative result deducts second magnitude of voltage less than zero for first magnitude of voltage in these two magnitudes of voltage, then step S16 judges that earlier this first touch point and this second touch point are in second candidate's control mode touch mode, and determines this primary importance of this first touch point and this second place of this second touch point according to this second candidate control mode touch mode.Wherein, this primary importance is corresponding to the first specific second touch pad group in this second specific first touch pad group and these two the second touch pad groups, and this second place is corresponding to the second specific second touch pad group in this first specific first touch pad group and these two the second touch pad groups.
It should be noted that first candidate's control mode touch mode and second candidate's control mode touch mode that step S16 judges also can be exchanged thereupon when the forward of this first test signal and this second test signal and oppositely each other to timing.
In sum, import known two first touch pad groups that the capacitance type touch-control panel of finger contact is arranged according to touch sensing device of the present invention and sensing method of touch control respectively by producing the opposite pulse wave of phase place, behind finger touch mode capacitive contact panel, the first touch pad group of first direction will reduce with phase mutual capacitance between the second touch pad group of second direction, therefore, being coupled to the voltage signal of the second corresponding touch pad group will be different.
In addition, touch sensing device proposed by the invention and method also may extend to the judgement of multi-point touch, have more than to be confined to 2 points.When the number of touch point during greater than 2, can get wherein respectively at 2 and judge with the same procedure in above-described embodiment, repeat to the actual position that defines all touch points and till removing false touch point.Thus, this touch sensing device and method can be under the multi-point touch states, whether the difference by magnitude of voltage is distinguish real touch point and false touch point just effectively different, and then orients the actual location that is formed at a plurality of touch points on the capacitance type touch-control panel.
By the detailed description of above preferred specific embodiment, hope can be known description feature of the present invention and spirit more, and is not to come protection scope of the present invention is limited with above-mentioned disclosed preferred specific embodiment.On the contrary, its objective is that hope can contain the arrangement of various changes and tool equality in the protection domain of the claim of institute of the present invention desire application.
The primary clustering symbol description
S10～S16: process step t
0, t
1, t
2, t
3: time point
1,2: touch sensing device 10,3: capacitance type touch-control panel
12: signal input module 14,20: sensing module
Y1～Y6: first touch pad group X1～X6: the second touch pad group
22: signal generator module 24: comparison module
A ', B ', C ', D ': false touch point 26: processing module
S1: the first test signal S2: second test signal
Vp: the first magnitude of voltage Vn: second magnitude of voltage
A, B, C, D, P1～P4: touch point X
1～X
6, Y
1～Y
6: touch pad.
Claims (12)
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| CN 200910176185 CN102033667B (en) | 2009-09-24 | 2009-09-24 | Touch sensing device and touch sensing method |
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| CN 200910176185 CN102033667B (en) | 2009-09-24 | 2009-09-24 | Touch sensing device and touch sensing method |
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| CN102033667B true CN102033667B (en) | 2013-09-04 |
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| GB2499242A (en) | 2012-02-10 | 2013-08-14 | Alterix Ltd | methods of operating excitation circuitry and/or measurement circuitry in a digitiser and a method of manufacturing a transducer for a digitiser |
| TWI601037B (en) * | 2012-08-09 | 2017-10-01 | 晨星半導體股份有限公司 | Testing system and testing method for touch-control apparatus |
| US9798372B2 (en) * | 2013-06-03 | 2017-10-24 | Qualcomm Incorporated | Devices and methods of sensing combined ultrasonic and infrared signal |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200638248A (en) * | 2005-04-19 | 2006-11-01 | Elan Microelectronics Corp | Capacitive touchpad with a physical key function |
| CN101101525A (en) * | 2007-08-08 | 2008-01-09 | 友达光电股份有限公司 | Touch control panel |
| CN101339480A (en) * | 2008-08-26 | 2009-01-07 | 友达光电股份有限公司 | Projection type capacitive touch device and method for identifying different contact positions |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7812827B2 (en) * | 2007-01-03 | 2010-10-12 | Apple Inc. | Simultaneous sensing arrangement |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200638248A (en) * | 2005-04-19 | 2006-11-01 | Elan Microelectronics Corp | Capacitive touchpad with a physical key function |
| CN101101525A (en) * | 2007-08-08 | 2008-01-09 | 友达光电股份有限公司 | Touch control panel |
| CN101339480A (en) * | 2008-08-26 | 2009-01-07 | 友达光电股份有限公司 | Projection type capacitive touch device and method for identifying different contact positions |
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