CN100435078C - Object detection method for capacitance type touch panel - Google Patents

Object detection method for capacitance type touch panel Download PDF

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Publication number
CN100435078C
CN100435078C CNB2005100775720A CN200510077572A CN100435078C CN 100435078 C CN100435078 C CN 100435078C CN B2005100775720 A CNB2005100775720 A CN B2005100775720A CN 200510077572 A CN200510077572 A CN 200510077572A CN 100435078 C CN100435078 C CN 100435078C
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CN
China
Prior art keywords
object
trackpad
induction amount
time
calculate
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CNB2005100775720A
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Chinese (zh)
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CN1885248A (en
Inventor
李佳益
汤冠群
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义隆电子股份有限公司
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Publication of CN1885248A publication Critical patent/CN1885248A/en
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Publication of CN100435078C publication Critical patent/CN100435078C/en

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Abstract

The present invention relates to an object checking method for a capacitance touch control board. At least one preset time is used for distinguishing noise interference or the operation of objects on a touch control board to correctly judge whether the objects touch the touch control board or leave the touch control board or move on the touch control board; further, the operation of various difference gestures are accurately checked.

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

104Y axle inductive layer 106 insulation courses

108X axle inductive layer 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 LiftDetectIn, 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, a kind of object detection method of capacitive touch control plate is characterized in that, comprising:
Detect the induction amount of this Trackpad; And
During greater than a critical value, calculate the variable quantity of this induction amount in this induction amount;
Wherein, if, representing an object in the trend of keeping increase in a described Preset Time that begins greater than a critical value, this induction amount touches this Trackpad.
2, the method for claim 1 is characterized in that, more comprises:
Calculate this object and touch the touching time of this Trackpad; And
When this touching time reaches one second Preset Time, send a touching signal.
3, method as claimed in claim 2 is characterized in that, more comprises the position of calculating this object, sends a position signalling.
4, 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 in the trend of keeping minimizing in a described Preset Time that begins less than a critical value, represents that this object leaves this Trackpad.
5, method as claimed in claim 4 is characterized in that, this confirms that an object touches the step of this Trackpad and comprise:
Detect this object and touch the second induction amount of this Trackpad; And
During greater than this critical value, calculate the variable quantity of this second induction amount in this second induction amount;
Wherein, if, representing this object in the trend of keeping increase in described one second Preset Time that begins greater than this critical value, this second induction amount touches this Trackpad.
6, method as claimed in claim 4 is characterized in that, more comprises:
Calculate the time departure that this object leaves this Trackpad; And
When this time departure surpasses one second Preset Time, send one and leave signal.
7, a kind of object detection method of capacitive touch control plate is characterized in that, comprising:
Confirm that an object touches this Trackpad;
Detect the induction amount of this Trackpad; And
Calculate the variable quantity of this induction amount;
Wherein, if in a Preset Time that begins greater than a critical value, 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.
8, method as claimed in claim 7 is characterized in that, this confirms that an object touches the step of this Trackpad and comprise:
Detect this object and touch the second induction amount of this Trackpad; And
During greater than this critical value, calculate the variable quantity of this second induction amount in this second induction amount;
Wherein, if, representing this object in the trend of keeping increase in described one second Preset Time that begins greater than this critical value, this second induction amount touches this Trackpad.
9, 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
In the time interval of once moving before (f) calculating this time reaches,,, get back to step (c) if be somebody's turn to do interval greater than this Preset Time if this time interval less than a Preset Time, is got back to step (d).
10, method as claimed in claim 9 is characterized in that, step (a) comprising:
Detect the induction amount of this Trackpad; And
During greater than a critical value, calculate the variable quantity of this induction amount in this induction amount;
Wherein, if, representing this object in the trend of keeping increase in described one second Preset Time that begins greater than a critical value, this induction amount touches this Trackpad.
11, method as claimed in claim 9 is characterized in that, step (c) comprising:
Detect the induction amount of this Trackpad; And
Calculate the variable quantity of this induction amount;
Wherein, if in one second Preset Time, this induction amount on the 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 begins to move when keeping the trend of minimizing.
12, 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, is then left this Trackpad to this object and confirms operation;
Calculate the time departure that this object leaves this Trackpad; And
If this time departure greater than one second Preset Time, is then sent one and is clicked signal.
13, method as claimed in claim 12 is characterized in that, the step that this affirmation object is touched this Trackpad comprises:
Detect the induction amount of this Trackpad; And
During greater than a critical value, calculate the variable quantity of this induction amount in this induction amount;
Wherein, if, representing this object in the trend of keeping increase in described one the 3rd Preset Time that begins greater than a critical value, this induction amount touches this Trackpad.
14, method as claimed in claim 12 is characterized in that, the step that this affirmation object leaves this Trackpad comprises:
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 in the trend of keeping minimizing in described one the 3rd Preset Time that begins less than a critical value, represents that this object leaves this Trackpad.
15, method as claimed in claim 12 is characterized in that, comprises that more the position of calculating this object sends a position signalling.
16, 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, is then left this Trackpad to this object and confirms operation;
Calculate the time departure that this object leaves this Trackpad;
If this time departure less than one second Preset Time, is then touched this Trackpad to this object and is confirmed operation;
Calculate this object and touch the second touching time of this Trackpad; And
If this second touching time, is then sent a towing signal greater than one the 3rd Preset Time.
17, method as claimed in claim 16 is characterized in that, the step that described affirmation object is touched this Trackpad comprises:
Detect the induction amount of this Trackpad; And
During greater than a critical value, calculate the variable quantity of this induction amount in this induction amount;
Wherein, if, representing this object in the trend of keeping increase in described one the 4th Preset Time that begins greater than a critical value, this induction amount touches this Trackpad.
18, method as claimed in claim 16 is characterized in that, this step of confirming that this object leaves this Trackpad comprises:
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 in the trend of keeping minimizing in described one the 4th Preset Time that begins less than a critical value, represents that this object leaves this Trackpad.
19, method as claimed in claim 16 is characterized in that, comprises that more the position of calculating this object sends a position signalling.
20, 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, is then left this Trackpad to this object and confirms operation;
Calculate the time departure that this object leaves this Trackpad;
If this time departure less than one second Preset Time, is then touched this Trackpad to this object and is confirmed operation;
Calculate this object and touch the second touching time of this Trackpad;
If this second touching time less than one the 3rd Preset Time, is then left this Trackpad to this object and confirms operation; And
Send one and double-click signal.
21, method as claimed in claim 20 is characterized in that, the step that this object of described affirmation is touched this Trackpad comprises:
Detect the induction amount of this Trackpad; And
During greater than a critical value, calculate the variable quantity of this induction amount in this induction amount;
Wherein, if, representing this object in the trend of keeping increase in described one the 4th Preset Time that begins greater than a critical value, this induction amount touches this Trackpad.
22, method as claimed in claim 20 is characterized in that, this step of confirming that this object leaves this Trackpad comprises:
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 in the trend of keeping minimizing in described one the 4th Preset Time that begins less than a critical value, represents that this object leaves this Trackpad.
23, method as claimed in claim 20 is characterized in that, comprises that more the position of calculating this object sends a position signalling.
CNB2005100775720A 2005-06-20 2005-06-20 Object detection method for capacitance type touch panel CN100435078C (en)

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