CN1885251A - Multi-object detection method for capacitive touch panel - Google Patents

Multi-object detection method for capacitive touch panel Download PDF

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CN1885251A
CN1885251A CN 200510077573 CN200510077573A CN1885251A CN 1885251 A CN1885251 A CN 1885251A CN 200510077573 CN200510077573 CN 200510077573 CN 200510077573 A CN200510077573 A CN 200510077573A CN 1885251 A CN1885251 A CN 1885251A
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objects
touch panel
touch
time
value
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CN100419657C (en
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李佳益
简永烈
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Elan Microelectronics Corp
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Elan Microelectronics Corp
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Abstract

The invention relates to a multi-object detection method of a capacitive touch pad, which distinguishes noise interference or operation of an object on the touch pad by at least one preset time so as to correctly judge whether the object touches or leaves the touch pad and further accurately detect various operations of different gestures.

Description

The multi-object detection method of capacitive touch control plate
Technical field
The detection method of the relevant a kind of capacitive touch control plate of the present invention is particularly about a kind of antinoise multi-object detection method.
Background technology
Capacitive touch control plate is a kind of for the finger input media that slip is moved with the control vernier on level and smooth panel.Because the thickness of capacitive touch control plate is extremely thin, thus can design among ultra-thin notebook computer, keyboard, digital player or other devices, and because it is not mechanical design, so very easy on safeguarding.
Fig. 1 is an existing two-dimensional capacitive touch control plate 100, and it comprises panel 102, Y-axis inductive layer 104, insulation course 106, X-axis inductive layer 108 and base plate 110.When finger 112 contact surface plates 102, the induction amount (electric capacity) of its touch position will produce change, and the control circuit that connects Trackpad 100 can be converted to the electric capacity on the Trackpad induction amount, as shown in Figure 2, and with position, the displacement of judging finger and the direction that moves.In the prior art, confirm whether touch capacitor type Trackpad 100 is as the foundation of judging with detected induction amount size to object, as shown in Figure 3, when induction amount during greater than critical value th, expression object touching Trackpad 100, otherwise when induction amount during less than critical value th, the expression object leaves does not have object to exist on Trackpad 100 or the Trackpad 100.
Yet Trackpad 100 may be subjected to producing noise as the interference of wireless device signals such as mobile phone, makes Trackpad 100 erroneous judgement have object to touch, click, move or other gesture operation thereon.Fig. 4 A is the noise example that is produced on Trackpad 100, this noise obtains the induction amount through analog digital conversion (ADC), shown in Fig. 4 B, the last waveform that obtains Fig. 4 C again through sampling, the waveform that is produced during similar two the finger touches Trackpads 100 of such waveform, as shown in Figure 5, so the noise of Fig. 4 A may be mistaken for two finger touches Trackpads 100, the operation that makes the mistake.
Therefore, a kind of detection method that can prevent noise jamming is to be the institute Ji.
Summary of the invention
The objective of the invention is to, a kind of multi-object detection method of capacitive touch control plate is provided, it can avoid the interference of noise.
According to the present invention, a kind of multi-object detection method of capacitive touch control plate is to distinguish that by setting at least one Preset Time the induction quantitative changeization on the Trackpad is that noise or object are operated on Trackpad, with the touching of correct judgement object or leave this Trackpad, and then detect the operation of various different gestures exactly.
The present invention realizes by the following technical solutions:
A kind of multi-object detection method of capacitive touch control plate comprises: detect the induction amount of this Trackpad, obtain one first peak value and one second peak value at least and during all greater than a critical value, calculate the variable quantity of this induction amount at this first and second peak value; Wherein, if this induction amount is kept the trend of increase in a Preset Time, expression has at least two objects to touch this Trackpad.
A kind of multi-object detection method of capacitive touch control plate comprises: affirmation at least two objects are touched this Trackpad; Detect the induction amount of this Trackpad, obtain one first peak value and one second peak value at least; And when at least one is less than a critical value in this first and second peak value, calculate the variable quantity of this induction amount; Wherein, as if the trend of in a Preset Time, keeping minimizing less than this first or second peak value of this critical value, represent that at least one leaves this Trackpad in this at least two object.
A kind of multi-object detection method of capacitive touch control plate comprises: affirmation at least two objects are touched this Trackpad; Calculate the object number of this Trackpad of touching; Calculate this at least two object and touch the touching time of this Trackpad; If this touching time less than one first Preset Time, confirms that then all objects leave this Trackpad; Calculate the time departure that this all objects leaves this Trackpad; And if this time departure greater than one second Preset Time, then send one and click signal; Wherein, calculating this touching during the time, the object number on this Trackpad remains unchanged.
A kind of multi-object detection method of capacitive touch control plate comprises: affirmation at least two objects are touched this Trackpad; Calculate the object number of this Trackpad of touching; Calculate this at least two object and touch the first touching time of this Trackpad; If this first touching time less than one first Preset Time, confirm that then this at least two object leaves this Trackpad; Calculate the time departure that this at least two object leaves this Trackpad; If this time departure, is then confirmed this this Trackpad of at least two touchings less than one second Preset Time; Calculate this at least two object and touch the second touching time of this Trackpad; If this second touching time less than one the 3rd Preset Time, confirms that then this at least two object leaves this Trackpad; And send one and double-click signal;
Wherein, during the time, the object number of touching this Trackpad remains unchanged in calculating this first and second touching.
A kind of multi-object detection method of capacitive touch control plate comprises:
Affirmation at least two objects are touched this Trackpad; Calculate the object number of this Trackpad of touching; Calculate this at least two object and touch the touching time of this Trackpad; In this first touching time during, confirm that at least one leaves this Trackpad in this at least two object greater than a Preset Time; The object number on this Trackpad is stayed in calculating; And send one and pull signal; Wherein, calculating this touching during the time, the object number on this Trackpad remains unchanged, and after at least one object left this Trackpad, the object number of staying on this Trackpad must be greater than 1.
Description of drawings
Fig. 1 is the existing two-dimensional capacitive touch control plate;
Fig. 2 is the graph of a relation of induction amount and position on the Trackpad of Fig. 1;
Fig. 3 shows detected induction quantitative changeization behind two finger touches Trackpads;
Fig. 4 A shows a noise;
Fig. 4 B changes resulting induction amount for noise among Fig. 4 A through analog/digital;
Fig. 4 C is with the oscillogram after Fig. 4 B sampling;
Detected oscillogram when Fig. 5 is two finger touches Trackpads;
Fig. 6 for the induction amount greater than critical value th after detected induction quantitative changeization;
Fig. 7 is the difference of twice induction amount among Fig. 6;
Fig. 8 shows that a detection signal is in order to explanation the present invention;
Fig. 9 shows a detection signal and touching signal;
Figure 10 for the induction amount less than critical value th after detected induction quantitative changeization;
Figure 11 is the difference of twice induction amount among Figure 10;
Figure 12 shows a detection signal;
Figure 13 shows a detection signal and leaves signal;
Figure 14 shows that a detection signal and clicks signal;
Figure 15 shows a detection signal and a double-click signal; And
Figure 16 shows a detection signal and a towing signal.
Symbol description
100 capacitive touch control plates, 102 panels
104 Y-axis inductive layers, 106 insulation courses
108 X-axis inductive layers, 110 base plates
112 fingers, 200 current detected induction discharge curves
Once detected induction discharge curve before 202
204 detection signals, 206 detection signals
208 touching signals, 210 current detected induction discharge curves
Once detected induction discharge curve before 212
214 detection signals, 216 detection signals
218 leave signal 220 detection signals
222 click signal 224 detection signals
226 double-click signal 228 detection signals
230 towing signals
Embodiment
Detection method of the present invention does not need to rely on the improvement of hardware testing circuit, just can improve the resistivity of noise, and can distinguish multiple gesture.
Confirm the detection method of many object touchings
Fig. 6 for two peak values of induction amount all greater than detected induction quantitative changeization behind the critical value th, wherein curve 200 is current detected induction amounts, curve 202 is preceding once detected induction amounts.Fig. 7 is the difference of twice induction amount among Fig. 6.Fig. 8 shows a detection signal 204.With reference to Fig. 6,7 and 8, during induction amount on detecting Trackpad, when two peak values of detected induction amount all greater than critical value th, as shown in Figure 6, detection signal 204 transfers noble potential to by electronegative potential, as shown in Figure 8, then in time T DownDetectThe interior induction amount that continues to detect on this Trackpad, and detected induction amount 200 deducts previous sensed quantity 202 each time, obtains an induction amount difference dV, as shown in Figure 7, if in time T DownDetectIn, resulting induction amount difference dV be on the occasion of, expression has two objects touchings Trackpad.Each peak value of wherein induction amount is a corresponding object, and therefore in other embodiments, if when having plural object to touch this Trackpad, this induction amount plural peak value occurs with correspondence.
Confirm the detection method of many object touching gestures (Touch Gesture)
Fig. 9 shows a detection signal 206 and touching signal 208.When detecting at least two objects touching Trackpad, begin to calculate this residence time of at least two objects on Trackpad, after meeting aforementioned " confirming the detection method of many objects touching " and determining object touching Trackpad, calculate the object number of this Trackpad of touching, if this at least two object rests on time on the Trackpad continuously greater than preset time T Touch, send many objects touching signals 208, and a position signalling is sent in the position of calculating this at least two object.Wherein these many object touching signals 208 can comprise the information of object number.
Confirm the detection method that many objects leave
Figure 10 be two peak values of induction amount all less than detected induction quantitative changeization behind the critical value th, wherein curve 210 is current detected induction amounts, curve 212 is preceding once detected induction amounts.Figure 11 is the difference of twice induction amount among Figure 10, and Figure 12 shows a detection signal 214.With reference to Figure 10,11 and 12, behind object touching Trackpad, in case detect induction amount induction amount two peak values at least one less than critical value th, two peak values of induction amount in this embodiment are all less than critical value, as shown in figure 10, detection signal 214 transfers electronegative potential to by noble potential, as shown in figure 12, and then in time T LiftDetectInterior lasting this induction amount that detects, and detected induction amount 210 deducts previous sensed quantity 212 each time, obtains an induction amount difference dV, as shown in figure 11, if in time T LiftDetectIn, resulting induction amount difference dV is negative value, represents that at least one leaves Trackpad in this two object.
Confirm that many objects leave the detection method of gesture (Lift Gesture)
Figure 13 shows a detection signal 216 and leaves signal 218.Behind object touching Trackpad, in case when detecting at least one object and leaving Trackpad, begin to calculate the time that this at least one object leaves Trackpad, the object number on this Trackpad is stayed in calculating, if still have object to stay on the Trackpad, calculate its position and send a position signalling, leave the time of Trackpad greater than preset time T meeting aforementioned " confirming the detection method that many objects leave " and object LiftGestureThe time, send and leave signal 218.Similarly, this leaves the information that signal 208 can comprise the object number.
Many objects are clicked the detection method of gesture (Tap Gesture)
Figure 14 shows that a detection signal 220 and clicks signal 222.When detecting at least two objects touching Trackpad, detection signal 220 transfers noble potential to by electronegative potential, as shown in figure 14, and then calculating this object touches the touching time of this Trackpad and calculates the object number, determining to meet " detection method of confirming many objects touchings ", and this touching time less than a preset time T TapDownJust detect all objects and leave this Trackpad, then detection signal 220 transfers electronegative potential to by noble potential, and then calculate the time departure that this object leaves this Trackpad, determining to meet " confirming the detection method that many objects leave ", and this time departure is greater than preset time T TapLiftThe time, send one and click signal 222, calculate the position that this at least two object is clicked simultaneously, send a position signalling.
Many objects are double-clicked the detection method of gesture (Double Tap)
Figure 15 shows a detection signal 224 and a towing signal 226.When detecting at least two objects and touch Trackpad for the first time, detection signal 224 transfers noble potential to by electronegative potential, as shown in figure 15, and then calculating this object touches the first touching time of this Trackpad and calculates the object number, determining to meet " detection method of confirming many object touchings ", and under the situation of object invariable number, this first touching time is less than preset time T TapDownJust detect all objects and leave this Trackpad, detection signal 224 transfers electronegative potential to by noble potential, and then calculate the time departure that this at least two object leaves this Trackpad, determining to meet " confirming the detection method that many objects leave ", and at this time departure less than preset time T TapLiftDetect all objects again and touch this Trackpad for the second time, then detection signal 224 transfers noble potential to by electronegative potential once more, calculate the second touching time of touching this Trackpad for the second time, determining to meet " detection method of confirming many object touchings ", and under the situation of object invariable number, this second touching time is less than preset time T DoubleDownThe time, detect all objects and leave this Trackpad once more, then detection signal 224 transfers electronegative potential to by noble potential, determining to meet " confirming the detection method that many objects leave ", send one and double-click signal 226, a position signalling is sent in the position of calculating this at least two object simultaneously.
The detection method of many object towing gestures (Drag Gesture)
Figure 16 shows a detection signal 228 and a towing signal 230.When detecting at least two objects and touching Trackpad for the first time, detection signal 228 transfers noble potential to by electronegative potential, as shown in figure 16, and then calculating this at least two object touches the first touching time of this Trackpad and calculates the object number, wherein the object number must be more than or equal to 2, determining to meet " detection method of confirming many object touchings ", and under the situation of object invariable number, this first touching time is greater than preset time T TapDownThe time, detect that at least one leaves this Trackpad in this at least two object, detection signal 228 transfers electronegative potential to by noble potential, meet " confirming the detection method that many objects leave " at the object of determining to leave, and stay object number on the Trackpad greater than 1 o'clock, send a towing signal 230, a position signalling is sent in the position of calculating this object simultaneously.
In each above-mentioned embodiment, utilize the variation of induction amount and default time ratio, can confirm various operations on Trackpad, avoid being subjected to noise jamming and judge by accident.

Claims (18)

1、一种电容式触控板的多物件检测方法，包括：1. A multi-object detection method for a capacitive touch panel, comprising: 检测该触控板的感应量，至少得到一第一峰值以及一第二峰值；以及Detecting the sensing value of the touch panel to obtain at least a first peak value and a second peak value; and 在该第一及第二峰值均大于一临界值时，计算该感应量的变化量；When the first and second peak values are both greater than a critical value, calculate the variation of the sensing quantity; 其中，若该感应量在一预设时间内维持增加的趋势，表示有至少二物件触碰该触控板。Wherein, if the sensing value maintains an increasing trend within a preset time, it means that at least two objects touch the touch panel. 2、如权利要求1所述的方法，其特征在于，更包括：2. The method of claim 1, further comprising: 计算触碰该触控板的物件数目；Count the number of objects touching the touchpad; 计算该至少二物件触碰该触控板的触碰时间；以及calculating the touch time of the at least two objects touching the touch panel; and 在该触碰时间达到一第二预设时间时，送出一触碰信号；sending a touch signal when the touch time reaches a second preset time; 其中，在计算该触碰时间时，在该触控板上的物件数目维持不变。Wherein, when calculating the touch time, the number of objects on the touch panel remains unchanged. 3、如权利要求2所述的方法，其特征在于，更包括计算该至少二物件的位置，送出一位置信号。3. The method of claim 2, further comprising calculating the positions of the at least two objects and sending a position signal. 4、一种电容式触控板的多物件检测方法，包括：4. A multi-object detection method for a capacitive touch panel, comprising: 确认至少二物件触碰该触控板；Confirm that at least two objects touch the touchpad; 检测该触控板的感应量，至少得到一第一峰值以及一第二峰值；以及Detecting the sensing value of the touch panel to obtain at least a first peak value and a second peak value; and 在该第一及第二峰值中至少一个小于一临界值时，计算该感应量的变化量；when at least one of the first and second peak values is less than a critical value, calculating the variation of the sensed quantity; 其中，若小于该临界值的该第一或第二峰值在一预设时间内维持减少的趋势，表示该至少二物件中至少一个离开该触控板。Wherein, if the first or second peak value less than the critical value maintains a decreasing trend within a preset time, it means that at least one of the at least two objects leaves the touch panel. 5、如权利要求4所述的方法，其特征在于，该确认至少二物件触碰该触控板的步骤包括：5. The method according to claim 4, wherein the step of confirming that at least two objects touch the touch panel comprises: 检测该感应量，至少得到该第一峰值以及第二峰值；以及Detecting the sensing quantity to obtain at least the first peak value and the second peak value; and 在该第一及第二峰值均大于该临界值时，计算该感应量的变化量；When the first and second peak values are both greater than the critical value, calculate the variation of the sensing quantity; 其中，若该感应量在一第二预设时间内维持增加的趋势，表示该至少二物件触碰该触控板。Wherein, if the sensing value maintains an increasing trend within a second preset time, it means that the at least two objects touch the touch panel. 6、如权利要求4所述的方法，其特征在于，更包括：6. The method of claim 4, further comprising: 计算该至少一物件离开该触控板的离开时间；calculating a departure time of the at least one object from the touch panel; 在该离开时间超过一第二预设时间时，送出一离开信号；以及sending a departure signal when the departure time exceeds a second preset time; and 计算留在该触控板上的物件数目；count the number of objects left on the touchpad; 其中，若留在该触控板上的物件数目不为零时，计算留在该触控板上物件的位置，送出一位置信号。Wherein, if the number of objects left on the touch panel is not zero, calculate the position of the objects left on the touch panel, and send a position signal. 7、一种电容式触控板的多物件检测方法，包括：7. A multi-object detection method for a capacitive touch panel, comprising: 确认至少二物件触碰该触控板；Confirm that at least two objects touch the touchpad; 计算触碰该触控板的物件数目；Count the number of objects touching the touchpad; 计算该至少二物件触碰该触控板的触碰时间；calculating the touch time of the at least two objects touching the touch panel; 若该触碰时间小于一第一预设时间，则确认所有物件离开该触控板；If the touch time is less than a first preset time, confirm that all objects leave the touch panel; 计算所有的该物件离开该触控板的离开时间；以及calculate all leave times of the object leaving the touchpad; and 若该离开时间大于一第二预设时间，则送出一单击信号；If the leaving time is greater than a second preset time, then send a click signal; 其中，在计算该触碰时间时，在该触控板上的物件数目维持不变。Wherein, when calculating the touch time, the number of objects on the touch panel remains unchanged. 8、如权利要求7所述的方法，其特征在于，该确认至少二物件触碰该触控板的步骤包括：8. The method according to claim 7, wherein the step of confirming that at least two objects touch the touch panel comprises: 检测该触控板的感应量，至少得到一第一峰值以及一第二峰值；以及Detecting the sensing value of the touch panel to obtain at least a first peak value and a second peak value; and 在该第一及第二峰值均大于一临界值时，计算该感应量的变化量；When the first and second peak values are both greater than a critical value, calculate the variation of the sensing quantity; 其中，若该感应量在一第二预设时间内维持增加的趋势，表示该至少二物件触碰该触控板。Wherein, if the sensing value maintains an increasing trend within a second preset time, it means that the at least two objects touch the touch panel. 9、如权利要求8所述的方法，其特征在于，更包括计算该至少二物件在该触控板上的位置送出一位置信号。9. The method of claim 8, further comprising calculating the positions of the at least two objects on the touch panel and sending a position signal. 10、如权利要求7所述的方法，其特征在于，该确认所有物件离开该触控板的步骤包括：10. The method of claim 7, wherein the step of confirming that all objects leave the touch panel comprises: 检测该触控板的感应量，至少得到一第一峰值以及一第二峰值；以及Detecting the sensing value of the touch panel to obtain at least a first peak value and a second peak value; and 在该第一及第二峰值均小于一临界值时，计算该感应量的变化量；When the first and second peak values are both less than a critical value, calculating the variation of the sensing quantity; 其中，若该感应量在一第二预设时间内维持减少的趋势，表示该至少二物件离开该触控板。Wherein, if the sensing quantity maintains a decreasing trend within a second preset time, it means that the at least two objects leave the touch panel. 11、一种电容式触控板的多物件检测方法，包括：11. A multi-object detection method for a capacitive touch panel, comprising: 确认至少二物件触碰该触控板；Confirm that at least two objects touch the touchpad; 计算触碰该触控板的物件数目；Count the number of objects touching the touchpad; 计算该至少二物件触碰该触控板的第一触碰时间；calculating a first touch time when the at least two objects touch the touchpad; 若在该第一触碰时间小于一第一预设时间，则确认该至少二物件离开该触控板；If the first touch time is less than a first preset time, confirming that the at least two objects leave the touch panel; 计算该至少二物件离开该触控板的离开时间；calculating the departure time of the at least two objects from the touch panel; 若该离开时间小于一第二预设时间，则确认该至少二触碰该触控板；If the leaving time is less than a second preset time, confirming that at least two people touch the touch panel; 计算该至少二物件触碰该触控板的第二触碰时间；calculating a second touch time when the at least two objects touch the touchpad; 若该第二触碰时间小于一第三预设时间，则确认该至少二物件离开该触控板；以及If the second touch time is less than a third preset time, confirming that the at least two objects leave the touch panel; and 送出一双击信号；Send a double-click signal; 其中，在计算该第一及第二触碰时间时，触碰该触控板的物件数目维持不变。Wherein, when calculating the first and second touch times, the number of objects touching the touch panel remains unchanged. 12、权利要求11所述的方法，其特征在于，该确认至少二物件触碰该触控板的步骤包括：12. The method of claim 11, wherein the step of confirming that at least two objects touch the touch panel comprises: 检测该触控板的感应量，至少得到一第一峰值以及一第二峰值；以及Detecting the sensing value of the touch panel to obtain at least a first peak value and a second peak value; and 在该第一及第二峰值均大于一临界值时，计算该感应量的变化量；When the first and second peak values are both greater than a critical value, calculate the variation of the sensing quantity; 其中，若该感应量在一第四预设时间内维持增加的趋势，表示该至少二物件触碰该触控板。Wherein, if the sensing value maintains an increasing trend within a fourth preset time, it means that the at least two objects touch the touch panel. 13、权利要求11所述的方法，其特征在于，该确认该至少二物件离开该触控板的步骤包括：13. The method of claim 11, wherein the step of confirming that the at least two objects leave the touch panel comprises: 检测该触控板的感应量，至少得到一第一峰值以及一第二峰值；以及Detecting the sensing value of the touch panel to obtain at least a first peak value and a second peak value; and 在该第一及第二峰值均小于一临界值时，计算该感应量的变化量；When the first and second peak values are both less than a critical value, calculating the variation of the sensing quantity; 其中，若该感应量在一第四预设时间内维持减少的趋势，表示该至少二物件离开该触控板。Wherein, if the sensing quantity maintains a decreasing trend within a fourth preset time, it means that the at least two objects leave the touch panel. 14、如权利要求11所述的方法，其特征在于，更包括计算该至少二物件在触控板上的位置送出一位置信号。14. The method of claim 11, further comprising calculating the positions of the at least two objects on the touch panel and sending a position signal. 15、一种电容式触控板的多物件检测方法，包括：15. A multi-object detection method for a capacitive touch panel, comprising: 确认至少二物件触碰该触控板；Confirm that at least two objects touch the touchpad; 计算触碰该触控板的物件数目；Count the number of objects touching the touchpad; 计算该至少二物件触碰该触控板的触碰时间；calculating the touch time of the at least two objects touching the touch panel; 在该第一触碰时间大于一预设时间时，确认该至少二物件中至少一个离开该触控板；confirming that at least one of the at least two objects leaves the touch panel when the first touch time is greater than a preset time; 计算留在该触控板上的物件数目；以及count the number of objects left on the touchpad; and 送出一拖曳信号；send a tow signal; 其中，在计算该触碰时间时，在该触控板上的物件数目维持不变，而在至少一物件离开该触控板后，留在该触控板上的物件数目必须大于1。Wherein, when calculating the touch time, the number of objects on the touch panel remains unchanged, and after at least one object leaves the touch panel, the number of objects remaining on the touch panel must be greater than 1. 16、如权利要求15所述的方法，其特征在于，该确认至少二物件触碰该触控板的步骤包括：16. The method according to claim 15, wherein the step of confirming that at least two objects touch the touch panel comprises: 检测该触控板的感应量，至少得到一第一峰值以及一第二峰值；以及Detecting the sensing value of the touch panel to obtain at least a first peak value and a second peak value; and 在该第一及第二峰值均大于一临界值时，计算该感应量的变化量；When the first and second peak values are both greater than a critical value, calculate the variation of the sensing quantity; 其中，若该感应量在一第二预设时间内维持增加的趋势，表示该至少二物件触碰该触控板。Wherein, if the sensing value maintains an increasing trend within a second preset time, it means that the at least two objects touch the touch panel. 17、如权利要求15所述的方法，其特征在于，该确认该至少二物件中至少一个离开该触控板的步骤包括：17. The method of claim 15, wherein the step of confirming that at least one of the at least two objects leaves the touch panel comprises: 检测该触控板的感应量，至少得到一第一峰值以及一第二峰值；以及Detecting the sensing value of the touch panel to obtain at least a first peak value and a second peak value; and 在该第一及第二峰值中至少一个小于一临界值时，计算该感应量的变化量；when at least one of the first and second peak values is less than a critical value, calculating the variation of the sensed quantity; 其中，若该小于该临界值的第一或第二峰值在一第二预设时间内维持减少的趋势，表示该至少二物件中至少一个离开该触控板。Wherein, if the first or second peak value less than the critical value maintains a decreasing trend within a second preset time, it means that at least one of the at least two objects leaves the touch panel. 18、如权利要求15所述的方法，其特征在于，更包括计算留在该触控板上所有物件的位置送出一位置信号。18. The method of claim 15, further comprising calculating the positions of all objects left on the touch panel and sending a position signal.
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