CN1885248A - Object detection method for capacitive touch panel - Google Patents

Abstract

The present invention is an object detection method for a capacitive touch panel, which distinguishes whether it is noise interference or an operation of an object on the touch panel by at least a preset time, so as to correctly judge whether the object touches the touch panel, leaves the touch panel or moves on the touch panel, thereby accurately detecting operations of various different gestures.

Description

The 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 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, numerical digit 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 existing technology, whether touch capacitor type Trackpad 100 is with the foundation of detected induction amount size as judgement to confirm 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 (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 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 object detection method of capacitive touch control plate distinguishes that by setting at least one Preset Time the induction quantitative changeization on the Trackpad is that noise or object are operated on Trackpad, touch this Trackpad, leave this Trackpad or on this Trackpad, move with correct judgement object, and then detect the operation of various different gestures exactly.

Of the present invention specifically have following several technical scheme: a kind of object detection method of capacitive touch control plate comprises: the induction amount that detects this Trackpad; And during greater than a critical value, calculate the variable quantity of this induction amount in this induction amount; Wherein, if this induction amount is kept the trend of increase in a Preset Time, represent that an object touches this Trackpad.

A kind of object detection method of capacitive touch control plate comprises: confirm that an object touches this Trackpad; Detect the induction amount of this Trackpad; And during less than a critical value, calculate the variable quantity of this induction amount in this induction amount; Wherein, if this induction amount is kept the trend of minimizing in a Preset Time, represent that this object leaves this Trackpad.

A kind of object detection method of capacitive touch control plate comprises: confirm that an object touches this Trackpad; Detect the induction amount of this Trackpad; And the variable quantity that calculates this induction amount; Wherein, if in a Preset Time, this induction amount on one first direction of this object is kept the trend of increase, and this induction amount on the second direction opposite with this first direction represents that this object moves to this first direction by leaving standstill beginning when keeping the trend of minimizing.

A kind of object detection method of capacitive touch control plate comprises: (a) affirmation one object is touched this Trackpad; (b) detecting this object moves; (c) confirm that this object begins to move by leaving standstill; (d) position signalling is sent in the position of calculating this object; (e) detecting this object once more moves; And (f) calculate the time interval of once moving before this time reaching, if this time interval less than a Preset Time, get back to step (d), if should get back to step (c) interval greater than this Preset Time.

A kind of object detection method of capacitive touch control plate comprises: confirm that an object touches this Trackpad; Calculate this object and touch the touching time of this Trackpad; If this touching time less than one first Preset Time, confirms that then this object leaves this Trackpad; Calculate the time departure that this object leaves this Trackpad; And if this time departure greater than one second Preset Time, then send one and click signal.

A kind of object detection method of capacitive touch control plate comprises: confirm that an object touches this Trackpad; Calculate this object and touch the first touching time of this Trackpad; If this first touching time less than one first Preset Time, confirms that then this object leaves this Trackpad; Calculate the time departure that this object leaves this Trackpad; If this time departure, is then confirmed this object less than one second Preset Time and is touched this Trackpad; Calculate this object and touch the second touching time of this Trackpad; And if this second touching time greater than one the 3rd Preset Time, then send one the towing signal.

A kind of object detection method of capacitive touch control plate comprises: confirm that an object touches this Trackpad; Calculate this object and touch the first touching time of this Trackpad; If this first touching time less than one first Preset Time, confirms that then this object leaves this Trackpad; Calculate the time departure that this object leaves this Trackpad; If this time departure, is then confirmed this object less than one second Preset Time and is touched this Trackpad; Calculate this 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 object leaves this Trackpad; And send one and double-click signal.

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 the variation of induction amount;

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 a detection signal;

Fig. 9 shows a detection signal and touching signal;

Figure 10 be 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 object is by the static variation of induction amount when being moved to the left;

Figure 15 is the difference of twice induction amount among Figure 14;

Figure 16 shows that a detection signal and clicks signal;

Figure 17 shows a detection signal and a towing signal; And

Figure 18 shows a detection signal and a double-click 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 current detected induction discharge curves

Once detected induction discharge curve before 222

224 detection signals 226 are clicked signal

228 detection signals, 230 towing signals

232 detection signals 234 are double-clicked signal

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 object touching

Fig. 6 shows detected induction quantitative changeization after the induction amount is greater than critical value th, and wherein curve 200 is current detected induction amount, and curve 202 is preceding once detected induction amount.Fig. 7 is the difference of twice induction amount among Fig. 6, and Fig. 8 shows a detection signal 204.With reference to Fig. 6,7 and 8, during induction amount on detecting Trackpad, when detected induction amount 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 object touching Trackpad.

Confirm the detection method of touching gesture (Touch Gesture)

Fig. 9 shows a detection signal 206 and touching signal 208.When detecting object touching Trackpad, begin to calculate the residence time of object on Trackpad, after meeting aforementioned " confirming the detection method of object touching " and determining object touching Trackpad, if object rests on time on the Trackpad continuously greater than preset time T _Touch, send touching signal 208, and a position signalling is sent in the position of calculating this object.

Confirm the detection method that object leaves

Figure 10 shows detected induction quantitative changeization after the induction amount is less than critical value th, and wherein curve 210 is current detected induction amounts, and curve 212 is preceding once detected induction amounts.Figure 11 is the difference of twice induction amount among Figure 10.Figure 12 shows a detection signal 214.With reference to Figure 10,11 and 12, behind object touching Trackpad, in case detect the induction amount less than critical value th, 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 _LittDetectIn, resulting induction amount difference dV is negative value, and the expression object leaves Trackpad.

Confirm to leave the detection method of gesture (Lift Gesture)

Figure 13 shows a detection signal 216 and leaves signal 218.When detecting object and leave Trackpad, begin to calculate the time departure that object leaves Trackpad, meeting aforementioned " confirming the detection method that object leaves " and this time departure greater than preset time T _LiftGestureThe time, send and leave signal 218.

Confirm that object is by leaving standstill the detection method that moves

When object by static must be through confirming to moving, otherwise noise or object have slight shake, might cause the erroneous judgement of object position, influences vernier generation misoperation.Figure 14 shows object by the static variation of induction amount when being moved to the left, and wherein curve 220 is current detected induction amounts, and curve 222 is preceding once detected induction amounts.Figure 15 is the difference of twice induction amount among Figure 14.After confirming object touching Trackpad, the difference dV of the induction amount on the detection Trackpad and detected each time induction amount 220 of calculating and preceding once detected induction amount is if the induction amount difference dV of this object left is in preset time T _MovingdetectIn keep the trend of increase, and keep the trend of minimizing at right-hand induction amount difference dV, shown in Figure 14 and 15, the expression object moves to left by leaving standstill beginning, otherwise, when the induction amount difference dV of this object left in preset time T _MovingdetectIn keep the trend of minimizing, and when right-hand induction amount difference dV kept the trend of increase, the expression object moved to right-hand by leaving standstill beginning.

The detection method of mobile gesture (Moving Gesture)

(a) affirmation one object is touched this Trackpad;

(b) detecting this object moves;

(c) carry out aforesaid " confirming that object is by leaving standstill the detection method that moves ";

(d) position signalling is sent in the position of calculating this object;

(e) detecting this object once more moves; And

The time interval of once moving before (f) calculating this time reaches is if this time interval is less than a preset time T _Moving, get back to step (d), otherwise, then get back to step (c).

Click the detection method of gesture (Tap Gesture)

Figure 16 shows that a detection signal 224 and clicks signal 226.When detecting object touching Trackpad, detection signal 224 transfers noble potential to by electronegative potential, as shown in figure 16, and then calculates the touching time that this object is touched this Trackpad, determining to meet " detection method of confirming the object touching ", and this touching time less than a preset time T _TapDownJust detect this object and leave this Trackpad, then detection signal 224 transfers electronegative potential to by noble potential, and then calculates the time departure that this object leaves this Trackpad, determining to meet " confirming the detection method that object leaves ", and this time departure is greater than preset time T _TapLiftThe time, send one and click signal 226, calculate the position that this object is clicked simultaneously, send a position signalling.

The detection method of towing gesture (Drag Gesture)

Figure 17 shows a detection signal 228 and a towing signal 230.When detecting an object and touch Trackpad for the first time, detection signal 228 transfers noble potential to by electronegative potential, as shown in figure 17, and then calculate this object and touch the first touching time of this Trackpad, determining to meet " detection method of confirming the object touching ", and this first touching time less than preset time T _TapDownJust detect this object and leave this Trackpad, then detection signal 228 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 object leaves ", and at this time departure less than preset time T _TapLiftDetect this object again and touch this Trackpad for the second time, detection signal 228 transfers noble potential to by electronegative potential once more, and then calculate the second touching time of touching this Trackpad for the second time, determining to meet " detection method of confirming the object touching ", and this second touching time is greater than preset time T _DragDown, send a towing signal 230, a position signalling is sent in the position of calculating this object simultaneously.

Double-click the detection method of gesture (Double Tap)

Figure 18 shows a detection signal 232 and a double-click signal 234.When detecting an object and touch Trackpad for the first time, detection signal 232 transfers noble potential to by electronegative potential, as shown in figure 18, calculate this object and touch the first touching time of this Trackpad, determining to meet " detection method of confirming the object touching ", and this first touching time less than preset time T _TapDownJust detect this object and leave this Trackpad, then detection signal 232 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 object leaves ", and at this time departure less than preset time T _TapLiftDetect this object again and touch this Trackpad for the second time, cut off the feet detection signal 232 and transfer 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 the object touching ", and this second touching time less than preset time T _DragDownDetect this object again and leave this Trackpad once more, then detection signal 232 transfers electronegative potential to by noble potential, determining to meet " confirming the detection method that object leaves ", sends one and double-clicks signal 234, and 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 (23)

1. An object detection method for a capacitive touch panel, comprising: detecting the sensory value of the touchpad; and When the sensing amount is greater than a critical value, calculating the variation of the sensing amount; Wherein, if the sensing value maintains an increasing trend within a preset time, it means that an object touches the touch panel. 2. The method of claim 1, further comprising: counting the touch time of the object touching the trackpad; and When the touch time reaches a second preset time, a touch signal is sent. 3. The method of claim 2, further comprising calculating the position of the object and sending a position signal. 4. An object detection method for a capacitive touch panel, comprising: Confirm that an object touches the touchpad; detecting the sensory value of the touchpad; and When the sensing amount is less than a critical value, calculating the variation of the sensing amount; Wherein, if the sensing amount maintains a decreasing trend within a preset time, it means that the object leaves the touch panel. 5. The method according to claim 4, wherein the step of confirming that an object touches the touch panel comprises: detecting the sensing quantity; and When the sensing amount is greater than the critical value, calculate the variation of the sensing amount; Wherein, if the sensing value maintains an increasing trend within a second preset time, it means that the object touches the touch panel. 6. The method of claim 4, further comprising: calculate the departure time of the object from the touchpad; and When the leaving time exceeds a second preset time, a leaving signal is sent. 7. An object detection method for a capacitive touch panel, comprising: Confirm that an object touches the touchpad; detecting the sensory value of the touchpad; and Calculate the variation of the sensing quantity; Wherein, if within a preset time, the sensing amount in a first direction of the object maintains an increasing trend, while the sensing amount in a second direction opposite to the first direction maintains a decreasing trend, Indicates that the object starts to move toward the first direction from rest. 8. The method of claim 7, wherein the step of confirming that an object touches the touchpad comprises: detecting the sensing quantity; and When the sensing amount is greater than a critical value, calculating the variation of the sensing amount; Wherein, if the sensing value maintains an increasing trend within a second preset time, it means that the object touches the touch panel. 9. An object detection method for a capacitive touch panel, comprising: (a) confirming that an object touches the touch panel; (b) detecting movement of the object; (c) confirm that the object begins to move from rest; (d) calculate the position of the object and send a position signal; (e) movement of the object is detected again; and (f) Calculate the time interval between this time and the previous movement, if the time interval is less than a preset time, return to step (d), if the time interval is greater than the preset time, return to step (c). 10. The method of claim 9, wherein step (a) comprises: detecting the sensory value of the touchpad; and When the sensing amount is greater than a critical value, calculating the variation of the sensing amount; Wherein, if the sensing value maintains an increasing trend within a second preset time, it means that the object touches the touch panel. 11. The method of claim 9, wherein step (c) comprises: detecting the sensory value of the touchpad; and Calculate the variation of the sensing quantity; Wherein, if within a second preset time, the sensing amount in a first direction of the object maintains an increasing trend, while the sensing amount in a second direction opposite to the first direction maintains a decreasing trend , it means that the object starts to move. 12. An object detection method for a capacitive touch panel, comprising: Confirm that an object touches the touchpad; Calculate the touch time of the object touching the touchpad; If the touch time is less than a first preset time, confirming that the object leaves the touch panel; calculate the departure time of the object from the touchpad; and If the leaving time is greater than a second preset time, a click signal is sent. 13. The method according to claim 12, wherein the step of confirming that the object touches the touchpad comprises: detecting the sensory value of the touchpad; and When the sensing amount is greater than a critical value, calculating the variation of the sensing amount; Wherein, if the sensing value maintains an increasing trend within a third preset time, it means that the object touches the touch panel. 14. The method according to claim 12, wherein the step of confirming that the object leaves the touch panel comprises: detecting the sensory value of the touchpad; and When the sensing amount is less than a critical value, calculating the variation of the sensing amount; Wherein, if the sensing amount maintains a decreasing trend within a third preset time, it means that the object leaves the touch panel. 15. The method of claim 12, further comprising calculating the position of the object and sending a position signal. 16. An object detection method for a capacitive touch panel, comprising: Confirm that an object touches the touchpad; Calculate the first touch time when the object touches the touchpad; If the first touch time is less than a first preset time, confirming that the object leaves the touch panel; calculate the departure time of the object from the touchpad; If the leaving time is less than a second preset time, confirming that the object touches the touch panel; calculating a second touch time when the object touches the touchpad; and If the second touch time is longer than a third preset time, a dragging signal is sent. 17. The method according to claim 16, wherein the step of confirming that the object touches the touchpad comprises: Detecting the sensing value of the touch panel; and When the sensing amount is greater than a critical value, calculating the variation of the sensing amount; Wherein, if the sensing value maintains an increasing trend within a fourth preset time, it means that the object touches the touch panel. 18. The method of claim 16, wherein the step of confirming that the object leaves the touch panel comprises: Detecting the sensing value of the touch panel; and When the sensing amount is less than a critical value, calculating the variation of the sensing amount; Wherein, if the sensing amount maintains a decreasing trend within a fourth preset time, it means that the object leaves the touch panel. 19. The method of claim 16, further comprising calculating the position of the object and sending a position signal. 20. An object detection method for a capacitive touch panel, comprising: Confirm that an object touches the touchpad; Calculate the first touch time when the object touches the touchpad; If the first touch time is less than a first preset time, confirming that the object leaves the touch panel; calculate the departure time of the object from the touchpad; If the leaving time is less than a second preset time, confirming that the object touches the touch panel; calculating a second touch time when the object touches the touchpad; If the second touch time is less than a third preset time, confirming that the object leaves the touch panel; and Send a double-tap signal. 21. The method according to claim 20, wherein the step of confirming that the object touches the touch panel comprises: Detecting the sensing value of the touch panel; and When the sensing amount is greater than a critical value, calculating the variation of the sensing amount; Wherein, if the sensing value maintains an increasing trend within a fourth preset time, it means that the object touches the touch panel. 22. The method of claim 20, wherein the step of confirming that the object leaves the touch panel comprises: Detecting the sensing value of the touch panel; and When the sensing amount is less than a critical value, calculating the variation of the sensing amount; Wherein, if the sensing amount maintains a decreasing trend within a fourth preset time, it means that the object leaves the touch panel. 23. The method of claim 20, further comprising calculating the position of the object and sending a position signal.

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