CN104063097B - Touch device and touch detection method thereof - Google Patents

Abstract

The invention provides a touch device and a touch detection method thereof. The touch detection method comprises the following steps: and then, calculating the mutual capacitance type detection result and the self-capacitance type detection result to obtain the position information of at least one touch point on the touch panel.

Description

Touch device and touch detection method thereof

technical field

The present invention relates to a touch device and a touch detection method thereof, in particular to a touch device implementing a composite touch detection method.

Background technique

With the advancement of electronic technology, electronic products have become an indispensable and important tool in people's lives. In order to improve the convenience of controlling the electronic products, operating the electronic products through the touch panel has become the mainstream of the electronic products. Therefore, accurately and quickly detecting the touch operation performed by the user on the electronic product is an important issue of the current electronic product.

In an existing touch device, the controller scans each touch channel or each intersecting point between touch panels one by one when determining whether a touch event occurs or not. Today, the demand for multi-touch has become a necessary function, such a touch detection method must speed up the scanning frequency of the touch detection to a certain extent to complete. However, as the size of the touch panel is increasing day by day, the scanning frequency of the touch detection must be further increased. A phenomenon of missed detection of touch points may occur. Therefore, how to effectively improve the accuracy of touch detection with limited resources has become an important topic for designers in this field.

Contents of the invention

The invention provides a touch device and a touch detection method thereof, which can more effectively detect multi-point touches without increasing the scanning frequency.

The touch detection method of the present invention is suitable for a touch panel, wherein the touch panel has a plurality of touch columns and a plurality of touch rows. The steps of the touch detection method include: performing mutual-capacitance touch detection and self-capacitance touch detection for the touch panel alternately, and obtaining mutual-capacity detection results and self-capacity detection results respectively, and then, for mutual capacitance The position information of at least one touch point on the touch panel is obtained by performing calculations on the result of the type detection and the result of the self-capacity type detection.

In an embodiment of the present invention, in the above-mentioned touch detection method, the step of performing mutual capacitive touch detection includes setting multiple driving channels for the touch bar or touch behavior, and setting There are multiple detection channels for the touch column or touch behavior of the channel, and then respectively provide driving signals to the driving channels in sequence, and obtain multiple mutual capacitance changes through the detection channels in sequence, and then generate mutual capacitance changes according to the mutual capacitance changes. Capacitive test results. The capacitance changes of the touch column and the touch row are measured in sequence, and a plurality of self-capacitance changes are obtained, and a self-capacitance detection result is generated according to the self-capacitance changes.

In an embodiment of the present invention, the touch detection method further includes: after the execution of the mutual capacitive touch detection is completed, judging whether the absolute values of the multiple mutual capacitance changes included in the mutual capacitive detection result have not fallen. In the invalid detection interval, if the absolute value of the mutual capacitance change does not fall in the invalid detection interval, continue to perform mutual capacitance touch detection, if at least one of the absolute values of the mutual capacitance change falls within the invalid detection In the interval, self-capacitive touch detection is performed.

In an embodiment of the present invention, the touch detection method further includes: after the execution of the mutual capacitive touch detection is completed, judging whether the absolute values of the multiple mutual capacitance changes included in the mutual capacitive detection result fall in the invalid detection interval, and test whether the number of touch points on the touch panel is 1, if the absolute value of the mutual capacitance change does not fall in the invalid detection interval and the number of touch points is not 1, then continue to perform mutual capacitance touch detection, if at least one of the absolute values of mutual capacitance changes falls in the invalid detection interval and/or when the number of touch points is 1, then perform self-capacitance Touch detection.

In an embodiment of the present invention, the touch detection method further includes: after the execution of the self-capacitive touch detection is completed, detecting whether the number of touch points on the touch panel is 1, if the touch points on the touch panel When the number of touch points is 1, self-capacitive touch detection is continuously performed, and if the number of touch points on the touch panel is not 1, mutual-capacitive touch detection is performed.

The touch device of the present invention includes a touch panel and a controller. The touch panel has multiple touch columns and multiple touch rows. The controller is coupled to the touch control surface, and the controller alternately performs mutual-capacitance touch detection and self-capacitance touch detection for the touch panel, and obtains the mutual-capacitance detection results and self-capacity detection results respectively, and then performs the mutual-capacitance The detection result and the self-capacity detection result are calculated to obtain position information of at least one touch point on the touch panel.

Based on the above, the present invention performs cross-type detection on the touch points on the touch panel by exchanging mutual-capacitance touch detection and self-capacity touch detection. In this way, the states of various possible touch points on the touch panel can be best detected in the way of hybrid mutual-capacitive touch detection and self-capacitive touch detection, so that the touch device The provided touch action can be more precise, and the efficiency of the associated system can be improved.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail with reference to the accompanying drawings.

Description of drawings

FIG. 1 shows a schematic flow diagram of a touch detection method according to an embodiment of the present invention;

2A to 2C show schematic diagrams of implementations of mutual capacitive touch detection in an embodiment of the present invention;

3A to 3C are schematic diagrams illustrating the implementation of self-capacitive touch detection according to the embodiment of the present invention;

4A and 4B are schematic diagrams showing capacitance changes according to an embodiment of the present invention;

FIG. 5 shows a flowchart of a touch detection method according to another embodiment of the present invention;

FIG. 6 shows a flowchart of a touch detection method according to another embodiment of the present invention;

FIG. 7 shows a schematic diagram of a touch device 700 according to an embodiment of the present invention.

Explanation of reference signs:

S110～S130, S510～S530, S610～S640: steps of touch detection;

200, 300, 710: touch panel;

X1～X3: touch bar;

Y1～Y3: Touch row;

210, 310: area;

CM1, CM2: Mutual capacitance;

CS1, CS2: self-capacitance capacitor;

Chmg, CFD, CFS, CF, CSX: capacitance;

FING: finger;

GND: ground terminal;

T1: touchpad;

ZD: invalid detection interval;

410, 420, 430, 440: Curve;

720: Controller.

detailed description

Please refer to FIG. 1 , which shows a schematic flowchart of a touch detection method according to an embodiment of the present invention. The touch detection method of this embodiment is applicable to a touch panel. The steps of the touch detection method include: in step S110, performing mutual capacitive touch detection on the touch panel, and then, in step S120, performing self-capacitive touch detection on the touch panel. The mutual-capacitive touch detection and the self-capacitive touch detection performed in step S110 and step S120 are respectively the mutual-capacitive detection results and the self-capacitive detection results. In step S130, calculations are performed on the mutual-capacitance detection results and self-capacity detection results respectively generated in steps S110 and S120 to obtain position information of one or more touch points on the touch panel .

It should be noted that the mutual capacitive touch detection and self mutual capacitive touch detection performed in steps S110 and S120 are interleaved and continuously performed. The continuously generated mutual-capacity detection results and self-capacity detection results are provided in real time to execute step S130 , and to judge the state of the latest touch point on the touch panel in real time.

To be specific, the touch detection method proposed in this embodiment first performs mutual capacitive touch detection on the touch panel to obtain the position information of most touch points, and focuses on the position information of the touch points that are difficult to interpret. , the self-capacitive touch detection is used to accurately detect the position information of the touch point that is difficult to interpret. The aforementioned difficult-to-determine position information of the touch points may be caused by poor common ground conditions between the user and the touch panel.

Please refer to FIG. 2A to FIG. 2C for the detection method of the mutual capacitive touch detection in this embodiment. 2A to 2C are schematic diagrams illustrating implementation manners of mutual capacitive touch detection according to an embodiment of the present invention. In FIG. 2A , the touch panel 200 includes a plurality of touch panels T1 arranged in an array shape, and forms a plurality of touch columns X1 - X3 and touch rows Y1 - Y3 . When performing mutual capacitive touch detection, the touch columns X1 - X3 and the touch rows Y1 - Y3 can be respectively set as multiple driving channels and multiple detection channels. Alternatively, the touch columns X1 - X3 and the touch rows Y1 - Y3 can be respectively set as a plurality of detection channels and a plurality of driving channels. Taking the touch rows Y1 - Y3 as an example set as a plurality of driving channels, the touch columns X1 - X3 are set as a plurality of detection channels. The touch rows Y1~Y3 as the driving channels are provided with driving signals respectively, and the touch columns X1~X3 as the detection channels provide the mutual capacitance changes between the driving channels and the detection channels for obtaining the provided driving signals. pipeline.

Taking the driving signal provided to the touch row Y1 as an example, the change of the mutual capacitance in the region 210 can be obtained by using the touch row X1 as a detection channel. And through the change of the mutual capacitance acquired by the touch bar X1, it can be known whether the region 210 is touched.

Please refer to FIG. 2B and FIG. 2C below. In FIG. 2B, when the area 210 is not touched, there is a mutual capacitance CM1 between the touch row Y1 as the driving channel and the touch row X1 as the detection channel. There is a capacitor CSX between the touch bar X1 and the ground terminal GND. In FIG. 2C, when the finger FING touches the touch lines Y1 and X1 (area 210), the capacitance Chmg on the finger FING, the capacitance CFD generated between the finger FING and the touch line Y1, and the touch between the finger FING and the touch The capacitance CFS generated between the row Y1 will change the mutual capacitance CM2 between the touch row Y1 and the touch column X1 as a detection channel. Wherein, the capacitance value of the mutual capacitance capacitor CM2 is smaller than the capacitance value of the mutual capacitance capacitor CM1 .

In addition, the aforementioned so-called common ground phenomenon refers to whether the potential between the ground terminal GND connected to the capacitor Chmg in the finger FING and the ground terminal GND coupled to the touch column X1 through the capacitor CSX is consistent. For example, when the user places the touch panel on the table and the user stands on the ground, the ground terminal GND connected to the capacitor Chmg in the finger FING is coupled to the ground terminal through the user's body. The situation will cause a poor common ground between the finger FING and the touch panel. When the common ground between the finger FING and the touch panel is not good, the mutual capacitance change caused by the touch of the finger FING to the touch panel will be greatly reduced, making it difficult to effectively determine the touch point question.

For the detection method of the self-capacitive touch detection in this embodiment, please refer to FIGS. 3A-3C . 3A to 3C are schematic diagrams illustrating the implementation of the self-capacitive touch detection according to the embodiment of the present invention. In FIG. 3A , the touch panel 300 also includes a plurality of touch panels T1 arranged in an array shape, and forms a plurality of touch columns X1 - X3 and touch rows Y1 - Y3 . When performing self-capacitive touch detection on the touch panel 300 , the capacitance changes of the touch columns X1 - X3 and the touch rows Y1 - Y3 can be measured sequentially, so as to obtain a plurality of self-capacitance changes. Taking the capacitance change measurement of the touch bar X2 as an example, by measuring the capacitance change of the touch bar X2 , the touched state of the region 310 can be known. Please refer to FIG. 3B and FIG. 3C below. In FIG. 3B , when the area 310 is not touched, the touch column X2 is coupled to the ground terminal GND through the self-capacitance capacitor CS1 . In FIG. 3C , when the area 310 is touched by the finger FING, the capacitance CF between the finger FING and the touch row X2 and the capacitance Chmg of the finger FING make the touch row X2 change, and the self-capacitance capacitor CS2 is coupled to the ground terminal. GND.

It can be clearly known from the above description that the position information of the touch point can be obtained by detecting the change of the self-capacitance of each touch column and each touch row.

Please refer to FIGS. 4A and 4B below. FIGS. 4A and 4B are schematic diagrams of capacitance changes according to an embodiment of the present invention. In FIG. 4A , the maximum value of the capacitance change of the curve 410 exceeds the invalid detection interval ZD, indicating that the detected touch point at this time is a touch point that can be effectively detected. In contrast, the maximum value of the capacitance change in the curve 420 falls within the invalid detection interval ZD, which indicates that the detected touch point is a touch point that is not easy to be detected. In contrast, in FIG. 4B, the capacitance change can always be less than 0, wherein, the maximum value of the capacitance change of the curve 430 is less than 0, and its absolute value exceeds the invalid detection interval ZD, indicating that the touch detected at this time A point is a touch point that can be effectively detected. In contrast, the capacitance change of the curve 440 is less than 0, and its maximum value falls in the invalid detection interval ZD, indicating that the detected touch point at this time is a touch point that is difficult to be detected.

It is worth noting that the above-mentioned detection method for the change of self-capacitance and mutual capacitance is a technology well known to those skilled in the art, that is to say, the capacitance detection method of the touch panel in the prior art can be applied. to the present invention.

Please refer to FIG. 5 below. FIG. 5 shows a flowchart of a touch detection method according to another embodiment of the present invention. In this embodiment, the touch detection method performs mutual capacitive touch detection on the touch panel in step S510, and determines in step S520 whether the mutual capacitive touch detection performed in step S510 is difficult to touch. detected state. That is to say, whether it is detected that at least one mutual capacitance change falls within the invalid detection interval. Once it is detected that the touch point is difficult to be detected, step S530 is executed to perform self-capacitive touch detection on the touch panel. If step S520 does not detect the state that the touch point is difficult to be detected, Then continue to execute step S510 to perform mutual capacitive touch detection.

It can be known from the above description that in this embodiment, the touch detection method can be selected and switched in real time, and a more suitable touch detection method can be selected corresponding to the actual state, so as to improve the accuracy of touch detection.

Please refer to FIG. 6 below. FIG. 6 shows a flowchart of a touch detection method according to another embodiment of the present invention. In this embodiment, the touch detection method performs mutual capacitive touch detection on the touch panel in step S610, and determines in step S620 whether the mutual capacitive touch detection performed in step S610 is difficult to touch. The state is detected, and the detection action of whether a single-point touch occurs on the touch panel at the current stage is performed. When it is determined in step S620 that the touch point is difficult to be detected, step S630 is executed to perform self-capacitive touch detection on the touch panel. Alternatively, if step S620 determines that the number of touch points on the touch panel is equal to 1 (that is, a single-touch detection action occurs), step S630 can also be executed to self-capacitate the touch panel. type touch detection. In contrast, if step S620 does not determine that a single-touch detection action has occurred on the touch panel, and the mutual capacitive touch detection performed in step S610 does not have a state where the touch point is not easily detected, the detection step S610 is continued. .

In addition, after step S630 is completed, this embodiment also performs a detection action of whether a single-point touch occurs on the touch panel in step S640. Once step S640 detects the state of a single-point touch on the touch panel, then Continue to execute step S630 to perform self-capacitive touch detection on the touch panel.

In this embodiment, when the mutual-capacitive touch detection is performed, if the touch points are not easily detected, the self-capacitive touch detection is used instead to detect the touch points. In addition, when a single-point touch occurs on the touch panel, the touch point is also detected by using a self-capacitive touch detection method that is more suitable for detecting a single-point touch. That is to say, in this embodiment, the mutual-capacitance touch detection or the self-capacitance touch detection can be selected according to the actual touch state of the touch panel, so as to effectively improve the accuracy of touch point detection.

Please refer to FIG. 7 below. FIG. 7 shows a schematic diagram of a touch device 700 according to an embodiment of the present invention. The touch device 700 includes a touch panel 710 and a controller 720 . The touch panel 710 has a plurality of touch columns and a plurality of touch rows, and the controller 720 is coupled to the touch panel 710 . The controller 720 alternately performs mutual-capacity touch detection and self-capacity touch detection on the touch panel 710 , and obtains mutual-capacity detection results and self-capacity detection results respectively. The controller 720 performs calculations on the mutual-capacity detection results and the self-capacity detection results to obtain position information of at least one touch point on the touch panel 710 .

The details of the actions of the controller 720 performing and judging the execution of the mutual-capacitive touch detection and the self-capacitive touch detection have been described in detail in the above-mentioned multiple embodiments and implementations, and will not be described in detail below.

To sum up, the present invention responds to various possibilities of touch points generated on the touch panel by hybrid mutual-capacitive touch detection and self-capacitive touch detection. In this way, regardless of single-point or multi-point touch, the detection action of the touch point can be completed through the detection method of the embodiment of the present invention. In addition, the difficult-to-detect detection points generated in the mutual capacitive touch detection method can also be detected by the self-capacitive touch detection method, which effectively reduces the possibility of missing touch points.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (10)

1. there is a kind of touch control detecting method a, it is adaptable to contact panel, the contact panel a plurality of touch-control to arrange and a plurality of touch-control OK, it is characterised in that include：

Staggeredly perform a mutual capacitance type touch control detection and a self-tolerant touch control detection for the contact panel, and obtain one respectively Mutual capacitance type testing result and a self-tolerant testing result；

Carry out computing to obtain on the contact panel at least for the mutual capacitance type testing result and the self-tolerant testing result The positional information of one touch point；

After the mutual capacitance type touch control detection is performed to be terminated, judge that multiple mutual tolerance electric capacity included in the mutual capacitance type testing result become Whether the absolute value of change is not all fallen within invalid detection interval；

If the absolute value of those mutual tolerance capacitance variations is not all fallen within the invalid detection interval, the mutual capacitance type touch-control is continued executing with Detection；And

If at least one of the absolute value of those mutual tolerance capacitance variations falls in the invalid detection interval, performing should be from appearance Formula touch control detection.

2. touch control detecting method according to claim 1, it is characterised in that the step of performing the mutual capacitance type touch control detection is wrapped Include：

Those touch-control row or a plurality of driving passage of those touch-control behaviors are set, and setting is not set to those of those driving passages Touch-control is arranged or those a plurality of sense channels of touch-control behavior；

Difference sequentially provides those driving passages a drive signal, and sequentially multiple mutually by those sense channels acquisitions respectively Hold capacitance variations；And

The mutual capacitance type testing result is produced according to those mutual tolerance capacitance variations.

3. touch control detecting method according to claim 1, it is characterised in that the step of performing the self-tolerant touch control detection is wrapped Include：

Sequentially measured for the capacitance variations of those touch-control row and those touch-control rows, and it is multiple from appearance electric capacity to use acquisition Change；And

The self-tolerant testing result is produced according to those from capacitance variations are held.

4. a kind of contactor control device, it is characterised in that include：

One contact panel, with a plurality of touch-control row and a plurality of touch-control row；And

One controller, couples the contact panel, and what the controller interlocked performs a mutual capacitance type touch control detection for the contact panel And a self-tolerant touch control detection, and a mutual capacitance type testing result and a self-tolerant testing result are obtained respectively, then for this Mutual capacitance type testing result and the self-tolerant testing result carry out computing to obtain at least touch point on the contact panel Positional information,

Wherein, the controller also judges to be wrapped in the mutual capacitance type testing result after terminating when mutual capacitance type touch control detection execution Whether the absolute value of the multiple mutual tolerance capacitance variations for including all is not fallen within invalid detection interval, if those mutual tolerance capacitance variations Absolute value is not all fallen within the invalid detection interval, and the controller then continues executing with the mutual capacitance type touch control detection, if those mutual tolerances At least one of the absolute value of capacitance variations falls in the invalid detection interval, and the controller then performs the self-tolerant touch-control Detection.

5. contactor control device according to claim 4, it is characterised in that when the controller performs the mutual capacitance type touch control detection, Those touch-control row or a plurality of driving passage of those touch-control behaviors are set, and setting is not set to those touch-controls that those drive passage Row or those a plurality of sense channels of touch-control behavior, controller difference sequentially provides a drive signal to those driving passages, and Respectively sequentially by those multiple mutual tolerance capacitance variations of sense channels acquisition, the controller comes again according to those mutual tolerance capacitance variations Produce the mutual capacitance type testing result.

6. contactor control device according to claim 4, it is characterised in that when performing the self-tolerant touch control detection, the controller Sequentially measured for the capacitance variations of those touch-control row and those touch-control rows, and used the multiple electric capacity that hold certainly of acquisition and become Change, the controller and according to those from holding capacitance variations producing the self-tolerant testing result.

7. there is a kind of touch control detecting method a, it is adaptable to contact panel, the contact panel a plurality of touch-control to arrange and a plurality of touch-control OK, it is characterised in that include：

Staggeredly perform a mutual capacitance type touch control detection and a self-tolerant touch control detection for the contact panel, and obtain one respectively Mutual capacitance type testing result and a self-tolerant testing result；

Carry out computing to obtain on the contact panel at least for the mutual capacitance type testing result and the self-tolerant testing result The positional information of one touch point；

After the mutual capacitance type touch control detection is performed to be terminated, judge that multiple mutual tolerance electric capacity included in the mutual capacitance type testing result become Whether the absolute value of change is not all fallen within invalid detection interval, and detects the individual of at least touch point on the contact panel Whether number is 1；

If the absolute value of those mutual tolerance capacitance variations is not all fallen within the invalid detection interval, and the number of an at least touch point The mutual capacitance type touch control detection is then continued executing with when not being 1；And

If at least one of the absolute value of those mutual tolerance capacitance variations fall in invalid detection interval and/or this at least one When the number of touch point is 1, then the self-tolerant touch control detection is performed.

8. touch control detecting method according to claim 7, it is characterised in that also include：

After the self-tolerant touch control detection is performed to be terminated, whether the number for detecting at least touch point on the contact panel is 1；

If the number of at least touch point on the contact panel is 1, the self-tolerant touch control detection is persistently carried out；And

If the number of at least touch point on the contact panel is not 1, the mutual capacitance type touch control detection is carried out.

9. a kind of contactor control device, it is characterised in that include：

One contact panel, with a plurality of touch-control row and a plurality of touch-control row；And

One controller, couples the contact panel, and what the controller interlocked performs a mutual capacitance type touch control detection for the contact panel And a self-tolerant touch control detection, and a mutual capacitance type testing result and a self-tolerant testing result are obtained respectively, then for this Mutual capacitance type testing result and the self-tolerant testing result carry out computing to obtain at least touch point on the contact panel Positional information,

Wherein, after terminating when mutual capacitance type touch control detection execution, the controller judges the mutual capacitance type testing result to the controller In the absolute value of included multiple mutual tolerance capacitance variations whether all do not fall within invalid detection interval, the controller is simultaneously detected Whether the number of at least touch point on the contact panel is 1, if the absolute value of those mutual tolerance capacitance variations does not all fall within In invalid detection interval, and the number of an at least touch point then the controller continues executing with the mutual capacitance type touch-control when not being 1 Detection, if at least one of the absolute value of those mutual tolerance capacitance variations fall in invalid detection interval and/or this at least When the number of one touch point is 1, the controller then performs the self-tolerant touch control detection.

10. contactor control device according to claim 9, it is characterised in that after the self-tolerant touch control detection is performed to be terminated, should Controller detects whether the number of at least touch point on the contact panel is 1, if on the contact panel this at least one The number of touch point be 1 when, the controller persistently carries out the self-tolerant touch control detection, if on the contact panel this at least one touch When the number of control point is not 1, the controller carries out the mutual capacitance type touch control detection.