TW201007534A - Object detecting method of capacitive touch pad is disclosed - Google Patents

Abstract

An object detecting method of capacitive touch pad is disclosed, which is judged by a predetermined time to distinguish the interference or operation of multi-object, then the present invention can correctly make a decision which the induction occurred on the Touch Pad is being touched or left, or moved on the Touch Pad, and can precisely detect different operation gestures of a user.

Description

201007534 VII. Designated representative map: (1) The representative representative of the case is: (8). (2) Brief description of the symbol of the representative figure: 204 Detection signal 八 8. If there is a chemical formula in this case, please disclose the chemical formula that best shows the characteristics of the invention: Nine, invention description: 4 201007534 [Technical field of invention] The invention relates to a method for detecting a capacitive touch panel, and more particularly to a method for detecting an anti-noise touch object. [Prior Art] A capacitive touch panel is an input device that is controlled by a finger (difficult) (four) electrical characteristic. When the touch object touches the touch panel or slides on the touch panel, the capacitance on the touch panel will change. By simply measuring the change of the capacitance, the representative touch can be calculated. The amount of cursor movement of the object. Because the thickness of the capacitive touch panel is so wide, it can be designed in (4) notebook computers, keyboards, digital players, etc. 1 is a conventional two-dimensional capacitive touch panel 1A, comprising: a panel 102, a 感应-axis sensing layer 〇4, an insulating layer 〇6, a χ-axis sensing layer 〇8, and a bottom plate 110. . When the finger 112 touches the panel 1〇2, the touched position thereof will have a corresponding capacitance change 'that is, the sensing amount is formed, and the control circuit connecting the touch panel 100 can be used on the touch panel. The change in capacitance is converted to the amount of induction. As shown in the second ®, the position of the finger, the amount of displacement, and the direction of movement can be determined by the side of the field. In the prior art, it is necessary to confirm whether the touch object touches the capacitive touch panel 100 with the magnitude of the side sensing amount as a basis for judging, as shown in Fig. 3. When the sensing amount is greater than the threshold value th, it indicates that the touch object touches the touch panel 100, and vice versa. 'When the sensing amount is less than the critical value, the touch object leaves the touch 201007534 panel 100 or the touch panel 100 does not touch. The object exists. ❹

However, the touch panel 100 may be disturbed by a signal of a wireless device such as a mobile phone to generate noise, so that the touch panel delays the touch, click, move or other gesture operation on the touch object. FIG. 4A is an example of noise generated on the touch panel 100. The noise is converted by an analog digital conversion (eight senses are obtained as shown in FIG. 4B, and finally sampled to obtain a 4C map. Such a waveform _like the waveform generated when two fingers touch the touch panel 1QQ is as shown in Fig. 5. Therefore, the noise of the 4A figure may be misjudged as two fingers touching the touch panel 1QQ. Therefore, the wrong operation is caused. Therefore, how to develop a detection method capable of preventing noise interference has become the focus of the development of the touch panel technology. _ [Summary of the Invention] In view of the above technical problems, the bribe supply capacitor The touch panel of the touch panel is used for the purpose of achieving the above object. The present invention provides a capacitive touch panel touch object. The method of measuring, by slaves at least - the preset time to distinguish the inductive change on the touch panel is that the miscellaneous touch touches the surface of the panel, and determines whether the touch object touches or leaves the control panel, thereby accurately Fine various gestures of exercise 201007534 field touch When the object is controlled by the panel, there will be a change in the amount of the secret. By changing the amount of the touch of the touch object, the gamma of the touch object can be performed; and the 'change of the field by the amount of the field can be changed (4) This is a true touch touch, not caused by noise. The present invention will explain the method of the present month for the following cases, including: Α. Confirm the detection method of touch touch; Confirm the touch gesture (Touch (3 lang _ method; c confirm the side method of the touch object leaving; D. confirm the touch object leaving gesture (Uft Gesture) detection ❹ &; E. From the stationary to the shift_side method; F. Moving Gesture detection method; G touch object click gesture (Ding Gest (four) side method; κ touch object drag gesture (Drag to fine (four) Debt measurement method; ι. Touch double-click gesture (DoubleTap) fine method below, respectively explain: A. Confirm the touch object touch detection method touch object touch touch for the touch surface wire, most will not Suddenly appears, or the 忽 suddenly disappears; that is, 'the sensing of the touch panel suddenly appears or disappears on the touch panel. Change, there will be some established trend, and there is a certain numerical stability. In the noise of Figure 4A, generally speaking, there is no trend. 5. With the change trend of the induction amount, the touch object can be used. Please confirm the touch detection. Please refer to Figure 6 for the change of the amount of the touch on the touch panel. It shows that the peak value of the sensor is less than the critical value and the 201007534 is detected. The amount of inductance changes, and its towel is a certain γ minus lining ^_χ axis value, which has eight points '', 幻, X2, χ3, X4, X5, χ6, χ7. Curve 202 is the The amount of induction detected in the second time, the curve 2〇〇 is the amount of induction detected last time.帛7® is the difference between each point of the 6th map of the towel ridge (the point X0 7 - the person's sensory amount minus the last sensory amount), that is, the point sensor difference dV' is shown in Figure 8. Detect the waveform of the signal 2〇4. Please refer to Figure 6, Figure 7, and 8 ® 'When the amount of money on the touch panel is less than the critical value th (as shown in Figure 6), the detection signal 2 〇4 is changed from low level to high level (as shown in Figure 8). Then, the sensing amount on the touch panel is continuously detected in the time TD_Detect, and the detected sensing amount 2〇2 is subtracted from the previous sensing measurement 200, and the point sensing difference value as shown in FIG. 7 is obtained. In the dV meter, if the point sensing difference dv obtained in the time TD〇wnDetect is a negative value, it means that the touch object touches the touch panel. This type of judgment is based on the detection of the amount of induction twice in a preset time. 'If there is a trend of decreasing the amount of induction, and the trend of reduction is consistent, that is, the touch object does touch the touch panel. . If it is the interference of noise, the amount of change in the amount of the first two times is not easy to be consistent. B_ Confirmation of the touch gesture (T〇uch Gesture) After confirming the touch of the touch object, you can start detecting the touch gesture and start calculating the position. Figure 9 shows a waveform diagram of the detection signal 206 and the touch signal 208. When it is detected that the touch object touches the touch panel, it starts to calculate the dwell time of the touch object on the touch panel 2010 201034, and conforms to the above “detecting the touch object touch detection method” and determines the touch object. After touching the touch panel, if the touch object continuously stays on the touch panel for more than the preset time TTouch, the touch object touch signal 208 is sent, and the position of the touch object is calculated, and the position signal is sent. C. Detection method for confirming the contact of the touch object The present invention can confirm the touch of the touch object by the above detection method of the touch of the touch object. The reverse of the touch, that is, the departure of the touch, must also be confirmed in an effective manner. The first 〇 diagram is the change in the amount of inductance detected after the peak value of the sense is greater than the threshold value th. Curve 212 is the measured amount of the measured value, and curve 2iq is the detected amount of the last detected ^Fig. 11 is the difference between each of the two sensing amounts in the first image (point X0~7) The current amount of induction minus the previous amount of inductance), that is, the 'point sensing difference dV' is shown in Fig. 12, which is a waveform diagram of the signal 214. Please refer to FIG. 10, FIG. 11 and FIG. 12, after the touch object touches the touch panel, once the detected amount is greater than the threshold th, as shown in FIG. 1, the detection signal 214 is high. The level is changed to the low level, as shown in Fig. 12, and then the sensing quantity is continuously detected in the time TuftDetect, and the detected sensing quantity 212 is subtracted from the previous sensing quantity 210' to get the point. The difference in sensing amount dv is as shown in Fig. 11. If in the time TuftDetect, the obtained point sensing difference dV is a positive value, indicating that the touch object leaves the touch panel. D. Confirm the touch Geometry (Lift Gesture) detection method 201007534 - Once you confirm that you touch the Detector, you can start to confirm the exit gesture of the touch object. FIG. 13 shows a waveform diagram of the detection signal 216 and the departure signal 218. After the touch object touches the touch panel, when the touch object leaves the touch panel, the calculation starts to calculate the departure of the touch object from the touch panel. The time is sent out of the signal 218 when the time of the "side method of confirming the touch object side" is met and the time when the touch object leaves the touch panel is greater than the preset time TuftGesture.

E. Confirm the detection method of the touch object from rest to movement. When the touch object is stationary or moving, it must be confirmed. Otherwise, the noise or the touch object may be slightly shaken, which may cause misjudgment of the position of the touch object. The cursor has a malfunction. When the U __thing is moved from the stationary to the right, the change: 'where the curve 222 is the amount of the gamma touch, and the curve 22 〇 is the amount of the _ to _. Figure 15 is the difference between each point of the two sensing quantities in Figure 14 (point X (this amount of induction of W minus the amount of previous sensing)', that is, the point sensing difference dV. After the touch object touches the touch panel, the amount of the touch on the side touch panel calculates the difference dV between the sensor 22 and the last detected touch point, if the touch amount is to the left (D-Button) _ The difference in the amount of dV maintains a trend of 3 additions in the Tm__, while the point DV of the inductive amount to the right (the second direction) maintains a decreasing trend, indicating a touch. From the standstill to the right to move; the opposite should be 1: when the left point sensed difference dV maintains a decreasing trend, and the sensed amount to the right of the point sensed difference dv, indicating that the touch is left stationary 201007534 Start moving to the left. As shown in Figure 14 and Figure 15. F. Moving Gesture detection method determines the change of the sensing quantity when the touch object touches the touch panel. That is to say, "Confirm the method of detecting the touch of a touch object", and judge whether there is a touch according to "Detecting the method of detecting the movement of the touch object" The touch object is activated on the touch south panel. If the touch object moves on the touch panel, it is determined to be a moving gesture, and at the same time, the position of the touch object is calculated to send the position signal β. Next, if the touch is detected again When the touch object moves, the time interval between this time and the previous movement is calculated. If the time interval obtained is less than the preset time Tm〇ving, then the position of the scale object is calculated, and the position signal of the generation is: , that is, if the obtained time interval is greater than the preset time, it is determined again whether there is a touch object moving on the touch panel. G. Touch Geometry (Tap Gesture) debt measurement method touches the bill The characteristic of the hit is that the touch time is shorter, so the gesture of detecting is different from the touch object. Figure 16 shows the waveform of the detection signal 224 and the click signal 226. The touch object is detected. When the touch panel is touched, the detection signal 224 is changed from the low level to the 咼 level, as shown in Fig. 16. Then, the touch time of the touch object touching the touch panel is calculated, and the touch object is determined to be touched. The touch panel, that is, the "detection method for confirming the touch of a touch object", and The touch time is less than the pre-S history time TTapDown detects that the touch object leaves the touch panel, and the detection signal 224 is changed from the standard position to the low level. Then, the departure time of the touch object leaving the touch panel is calculated. When it is determined that the "detection method for confirming the departure of the touch object" is satisfied, and the time of leaving 11 201007534 is greater than the preset time TTapLift, it can be judged as a click gesture, and the signal 226' simultaneously calculates the position of the click of the touch object, and sends the position. The number H. Touch Geometry (Drag Gesture) detection method thief gesture time is longer than the previous example. Figure 17 shows the detection of the number 228 and the destruction of the ship 230 waveform, detected When the touch object touches the touch panel for the first time, the detection signal 228 is changed from the low level to the high level, such as the 17th.

The figure shows. Then, the first touch time of the touch object touched by the touch panel is calculated, and when the touch object is touched, the "touch copper method of touching the touch object" is met, and the first touch time is met. When the time is less than the time __, the touch is detected to leave the touch panel, and the signal 228 is changed from the high level to the low level. Then, the second touch time of touching the touch panel for the second time is calculated, and the determination is consistent with the “detection method for confirming the departure of the touch object”, the wire opening time is less than the preset time TTapUft and the touch object is detected for the second time. When the touch panel is touched, the detection signal 228 is again changed from the low level to the high level. Then, the second touch time of the touch panel is touched for the second time. When the touch object is touched, the foot is in accordance with the "confirmation touch object touch" [measurement method", and the second touch The touch time is greater than the preset time TDragD°Wn 'the drag signal 230 is sent, and the position of the touch object is calculated, and the position signal is sent. 1 Touch double click gesture (Double Tap) inspiration method Double click gesture is a click gesture that is performed twice in a short time. Figure 18 shows the detection of the wave paste of 彳5 232 and double-click signal 234. When the touch panel 12 201007534 touches the touch panel for the first time, the detection signal 232 is changed from the low level to the high level, as shown in FIG. 18, and then the touch object touches the touch panel. The first-touch time, when it is determined that the touch object touches the touch panel, that is, it conforms to the "confirmation touch touch detection method" and the touch time is less than the preset time. When the touch object leaves the touch panel, the detection signal 232 (four) is turned to the low level, and then the departure time of the touched object is separated from the touch panel, and the detection method of determining that the touch is away from the touch object is determined, and The departure time is less than the preset time Π TTapLrft and the _ touch object touches the touch panel for the second time, and the signal 232 is changed from the low level to the high level again, and the second touch panel is touched for the second time. Touch the time. When the touch object touches the touch panel, that is, it conforms to the "send method of confirming the touch of the touch object", and when the second _ is less than the preset time TDragDQWn, the touch object is detected to leave the touch panel again, then The detection signal 232 is changed from the same level to the low level. ^ In the determination of the "A method of detecting the departure of the touch object", the double-click signal 234 is sent, and the position of the touch object is calculated, and the P position signal is sent. In each of the above embodiments, the operation on the touch panel of each age can be effectively avoided by using the change of the sensing amount and the time of the sensing amount, so that noise interference can be effectively avoided. Misjudgment of the movement of the touch object. Although the preferred embodiments of the present invention are disclosed above, it is not intended to limit the present invention, and those skilled in the art can make some modifications and refinements without departing from the spirit of the present invention and the scope of the invention. Therefore, the scope of patent protection of the present invention is defined by the scope of the claims appended hereto. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a conventional two-dimensional capacitive touch panel; FIG. 2 is a diagram showing the relationship between sense # and position on the touch panel of FIG. 1; FIG. 3 is a view showing changes in the amount of induction; Figure 4A shows the signal diagram of a noise; & 帛® is the amount of inductance obtained by analog-to-digital conversion in Figure 4A; Figure 4C is the waveform after sampling Figure 4B; The waveform detected by two fingers touching the touch panel; Figure 6 shows the change of the detected amount after the sensing amount is less than the critical value th; Figure 7 is the two sensing quantities in Figure 6. Difference; Figure 8 shows the waveform of the detection signal 204; Figure 9 shows the waveform of the detection signal 206 and the touch signal 208; ® The first image is detected after the sensing value is greater than the critical value th Inductive amount change; Figure 11 is the difference between the two sensing quantities in Figure 10; Figure 12 shows the waveform of the detection signal 214; the figure shows the waveform of the detection signal 216 and the departure signal 218; Figure 14 Shows the change in the amount of the touch when the touch object moves from rest to the right; Figure 15 shows the difference between the two sensed quantities in Figure 14; The figure shows the waveforms of the detection signal 224 and the click signal 226; 14 201007534 FIG. 17 shows the waveforms of the detection signal 228 and the drag signal 230; and FIG. 18 shows the waveforms of the detection signal 232 and the double-click signal 234. [Main component symbol description]

100 Capacitive Touch Panel 102 Panel 104 丫 Axis Sensing Layer 106 Insulation Layer 108 X-Axis Sensing Layer 110 Base Plate 112 Finger 200 Last Measured Inductance Curve 202 This time the measured inductance curve 204 Detected Detecting signal 206 Detecting signal 208 Touching signal 210 The last measured sensation curve 212 The measured sensation curve 214 of this time Detecting signal 216 Detecting signal 218 leaving signal 220 Last time Measured Inductance Curve 15 201007534 222 Detected Measured Curve 224 Detected Signal 226 Clicked Signal 228 Detected Signal 230 Dragged Signal 232 Detected Signal 234 Double-clicked Signal

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Claims (1)

201007534 X. Patent application scope: 1. A method for detecting a touch object of a capacitive touch panel, comprising: detecting a sensing amount of the touch panel; and calculating the sensing amount when the sensing amount is less than a critical value The amount of change; wherein if the amount of sensing maintains a decreasing trend for a predetermined period of time, indicating that a touch object touches the touch panel. 2. The method of applying for the first item, further includes: calculating a touch time of the touch object touching the touch panel; and sending a touch when the touch time reaches a second preset time Touch the signal. The method of claim 2, further comprising calculating the position of the touch object and sending a position signal. The method for detecting a touch object of a capacitive touch panel includes: confirming that a touch object touches the touch panel; detecting a sensing amount of the touch panel; and detecting that the sensing amount is greater than a threshold value Calculating the amount of change of the sensing amount; wherein 'if the sensing amount maintains an increasing trend within a preset time period, indicating that the touch object leaves the touch panel. 5. The method of claim 4, wherein the step of confirming that a touch object touches the touch panel comprises: detecting the amount of sensing; and when the amount of sensing is less than the threshold, calculating a field The amount of change; 17 201007534 where 'if the amount of the sensor is maintained decreasing for a second predetermined time, indicating that the touch object touches the touch panel. 6. The method of claim 4, further comprising: calculating a departure time of the touch object from the touch panel; and when the time is longer than the second thief time. 7_—a method for detecting a touch object of a capacitive touch panel, comprising: confirming that a touch object touches the touch panel; © detecting an amount of the touch panel; and calculating the amount of the touch a point-sensing change amount of one time; wherein, if it is turned off at i, the amount of the sense in the -direction of the touch object maintains an increasing tendency, and a _ square on the opposite side of the first direction When the amount of the sensing is maintained to decrease, the touch object is moved from the first direction to the first direction; wherein the step of touching the touch panel by the touch object includes: 侦测 detecting the sensing amount; And when the sensing amount is less than a threshold value, calculating the amount of change of the sensing amount; wherein 'if the sensing amount maintains a decreasing trend during the second predetermined time, indicating that the touch object touches the touch panel. 8_—A method for detecting a touch object of a capacitive touch panel, comprising: (a) confirming that a touch object touches the touch panel; (b) detecting the movement of the touch object; 18 201007534 (c) Confirm that the touch object moves from the standstill, (d) calculate the position of the touch object, send a position signal; (e) detect the movement of the touch object again; and count the team ten times and above If the time interval is less than the preset time, return to step (9), and if the time interval is greater than the preset time, return to step (c); wherein step (a) comprises the following steps: detecting the a sensing amount of the touch panel; and when the sensing amount is less than a threshold value, calculating a variation amount of the sensing amount; wherein, if the sensing amount maintains a decreasing trend during the second predetermined time, indicating the touch object Touch the touch panel. 9_ The method of claim 8, wherein the step (6) comprises: detecting the amount of sensing of the touch panel; and calculating the amount of the sensing and the last point sensing change; wherein, the right is in the second During the preset time, the amount of the sensing in the first direction of the touch object maintains an increasing trend, and the tendency of the sensing amount in the second direction opposite to the first direction decreases. Touch _ start moving. The touch object of the capacitive touch panel _ method includes: confirming that a touch object touches the touch panel; calculating a touch time of the touch object touching the touch panel; if the touch time is less than a first preset time, confirming that the touch object leaves the 19 201007534 touch panel; calculating a departure time of the touch object from the touch panel; and sending the departure time if the departure time is greater than a second preset time a click signal; wherein the step of the touch object touching the touch panel comprises: detecting a sensing amount of the touch panel; and calculating a change amount of the sensing amount when the sensing amount is less than a threshold value Wherein, if the sensing amount maintains a decreasing trend for a third preset time, it indicates that the touch object touches the touch panel. 11. The method of claim 10, wherein the step of confirming that the touch object leaves the touch panel comprises: detecting a sensing amount of the touch panel; and calculating when the sensing amount is greater than a threshold value The amount of change in the amount of sensing; wherein 'if the amount of sensing maintains an increasing trend during a third predetermined time period, indicating that the touch object leaves the touch panel. 12. The method of claim 2, further comprising calculating a position of the touch object and sending a position signal. 13. A method for detecting a touch object of a capacitive touch panel, comprising: confirming that a touch object touches the touch panel; calculating a touch time of the touch object touching the touch panel; If the touch time is less than - the first preset time, the disc recognizes the touch object to leave the touch panel; 20 201007534 calculates the departure time of the touch object leaving the touch panel; if the departure time is less than a second preset Time, confirming that the touch object touches the touch panel; calculating a second touch time of the touch object touching the touch panel; and if the second touch time is greater than a third preset time, Send a tow signal; The step of the touch panel touching the touch panel includes: measuring a sensing amount of the touch panel; and calculating a change amount of the sensing amount when the sensing amount is less than a threshold; wherein, if The sensing amount maintains a decreasing trend for a fourth preset time, indicating that the touch object touches the touch panel. The method of claim 13 , wherein the step of confirming that the touch object leaves the touch panel comprises: detecting a sensing amount of the touch panel; and calculating the sensing when the sensing amount is greater than a threshold value The amount of change; wherein, if the amount of induction maintains an increasing trend for a fourth predetermined time period, it indicates that the touch object leaves the touch panel. 15_ The method of claim 13 of the scope of the application further includes calculating the position of the object to send a position signal. 16_—A method for detecting a touch object of a capacitive touch panel, comprising: confirming that a touch object touches the touch panel; 21 201007534 calculating a first touch time of the touch object touching the touch panel; If the first touch time is less than a first preset time, confirm that the touch object leaves the touch panel; calculate a departure time of the touch object from the touch panel; if the departure time is less than a second pre- Setting a time, confirming that the touch object touches the touch panel; calculating a second touch time when the touch object touches the touch panel; if the second touch time is less than a third preset time, Confirming that the touch object leaves the touch panel; and sending a double-click signal; wherein the step of detecting the touch object touching the touch panel includes: detecting a sensing amount of the touch panel; When the sensing amount is less than a threshold value, the amount of change of the sensing amount is calculated; wherein if the sensing amount maintains a decreasing trend for a fourth preset time, it indicates that the touch object touches the touch panel. 17. The method of claim 16, wherein the step of confirming that the touch object leaves the touch panel comprises: detecting a sensing amount of the touch panel; and calculating when the sensing amount is greater than a threshold value The amount of change in the amount of sensing; wherein if the amount of sensing maintains an increasing trend for a fourth predetermined time period, indicating that the touch object leaves the touch panel. 22 201007534 18. The method of claim 16, further comprising calculating the position of the touch object and sending a position signal.