CN110554797B - Sensing method and sensing module of touch control identification device - Google Patents
Sensing method and sensing module of touch control identification device Download PDFInfo
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- CN110554797B CN110554797B CN201910420394.9A CN201910420394A CN110554797B CN 110554797 B CN110554797 B CN 110554797B CN 201910420394 A CN201910420394 A CN 201910420394A CN 110554797 B CN110554797 B CN 110554797B
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- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
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- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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Abstract
The invention discloses a sensing method of a touch identification device, which comprises the following steps: selecting a first sensing electrode to be used for reverse measurement; driving more than one driving electrode, measuring the first sensing electrode to obtain a first measurement value, and measuring other sensing electrodes except the first sensing electrode to obtain other point measurement values; comparing each point measurement value on the same driving electrode with the variation value of the first measurement value; checking whether the variance is above or below a threshold value; if yes, judging that the sensing electrode on the point measurement value is abnormal; and stopping touch measurement when at least one variation value is higher or lower than the threshold value. The invention can judge whether the foreign matter is positioned on the touch control identification device or not when the touch control signal is read in the common periodic wave difference comparison operation of the sensing method by periodically or real-time alternately executing a judging program, and eliminate noise signals, thereby improving the overall sensing accuracy.
Description
[ field of technology ]
The present invention relates to a sensing method and a sensing module thereof for a touch recognition device, and more particularly to a sensing method and a sensing module thereof for determining whether a foreign object is located on a touch recognition device when a touch signal is read, so as to improve the overall sensing accuracy.
[ background Art ]
The touch panel or the touch screen is one of the main modern man-machine interfaces, and as a position identification device, the touch panel or the touch screen can be skillfully combined with an input interface and a display interface, so that the touch panel or the touch screen has the advantages of saving the space of the device and being humanized in operation, and is widely applied to various consumer or industrial electronic products at present. Examples: personal digital assistants (personal digital assistant, PDAs), palm-sized PCs, tablet computers (tablet computers), mobile phones (mobile phones), information appliances (Information Appliance), point-Of-Sale (POS) devices, and the like.
The conventional capacitive touch panel includes a data processing module, a driving electrode, a sensing electrode, and the like, wherein the driving electrode and the sensing electrode are respectively electrically connected with the data processing module through respective interfaces. The driving electrode is composed of a plurality of driving electrode strips parallel to each other, and the sensing electrode is composed of a plurality of sensing electrode strips parallel to each other, wherein each driving electrode strip and each sensing electrode strip are arranged perpendicular to each other to form a plurality of intersections. When the driving electrode is driven by the driving voltage, an electric field is formed between the driving electrode and the sensing electrode, so that the sensing electrode generates sensing charges and has an interaction capacitance, and a plurality of driving electrode strips and a plurality of sensing electrode strips form a plurality of electric fields, so that each intersection can be simulated to have an interaction capacitance, and a plurality of intersections form an interaction capacitance array. The interactive capacitor array has a stable capacitance (hereinafter referred to as substrate capacitance) under a steady-state environment, so that the sensing electrode generates a sensing voltage (the sensing voltage at this time is referred to as substrate voltage), and the data processing module reads the sensing voltage through its interface. When a finger or other conductive substance approaches the intersection, the electric field at that location will change, causing a change in the induced voltage. After the changed induction voltage is transmitted to the data processing module, the digital signal is converted by the analog-to-digital converter, and then whether the induction voltage is a touch signal or not is identified by an algorithm, whether the calculation of the touch position is carried out or not is determined, and further touch information input data output to a host end is processed and formed. The host side is a device with at least one Central Processing Unit (CPU) control, such as a computer, PDA, etc.
Since an electric field formed between the driving electrode and the sensing electrode is easily interfered by external electromagnetic waves or the like, a change in the amount of charge transferred by capacitive charging due to a conductive substance such as a finger cannot be accurately measured. Therefore, in the prior art, a method of subtracting the noise by using the signal subtraction method is provided, which repeatedly performs a measurement cycle to obtain more than two different sensing voltage signals for subtraction. More than two different sensing voltage signals are processed by a differential method (differential) to obtain a touch signal eliminating substrate noise (common mode noise). Although the common difference method can eliminate the substrate noise, the difference value is calculated by the sensing signals of every two pairs, and the accuracy or resolution may be reduced due to the touch of the foreign matter in the measuring process.
[ invention ]
In order to overcome the disadvantages of the prior art, the present invention provides the following various embodiments to solve the above-mentioned problems.
The embodiment of the invention provides a sensing method and a sensing module of a touch control identification device, which can judge whether a foreign object is positioned on the touch control identification device and eliminate noise signals when touch control signals are read in a common periodic wave difference comparison operation of the sensing method by periodically or real-time alternately executing a judging program, thereby improving the overall sensing accuracy.
In order to achieve one or a part or all of the above or other objects, an embodiment of the present invention provides a sensing method of a touch recognition device, wherein the touch recognition device includes a plurality of sensing electrodes and a plurality of driving electrodes, and the plurality of sensing electrodes and the plurality of driving electrodes intersect to have a plurality of nodes, the sensing method includes the following steps: selecting a first sensing electrode of the plurality of sensing electrodes, and setting the first sensing electrode as reverse measurement, wherein the first sensing electrode intersects with the plurality of driving electrodes to have a plurality of first nodes; driving one or more driving electrodes, measuring the first sensing electrode to obtain a first measurement value of one or more first nodes, and measuring other sensing electrodes except the first sensing electrode to obtain a plurality of point measurement values of a plurality of nodes; comparing each point measurement value on the same driving electrode with a variation value of the first measurement value respectively; checking whether the variation value is higher or lower than a threshold value; if the variation value is higher or lower than the threshold value, judging that the sensing electrode on the point measurement value is abnormal; and stopping touch measurement when at least one variation value is higher or lower than the threshold value.
In an embodiment, the number of the sensing electrodes determined to be abnormal is at least two, and the touch measurement is stopped.
In one embodiment, the touch measurement is performed if the variance is not higher or lower than the threshold value, or if the number of abnormal sensing electrodes is not two.
In one embodiment, the step of obtaining the first measurement value and the plurality of point measurement values further comprises driving one or a portion of the plurality of driving electrodes; measuring the first sensing electrode to obtain a first measurement value of one or more first nodes, and simultaneously or sequentially measuring other sensing electrodes except the first sensing electrode to obtain one or a part of a plurality of point measurement values; stopping driving; driving another one or the rest of the plurality of driving electrodes; measuring the first sensing electrode to obtain a first measurement value of one or more first nodes, and simultaneously or sequentially measuring other sensing electrodes except the first sensing electrode to obtain another one or the rest of the plurality of point measurement values; and repeating the driving operation to obtain all of the plurality of point measurement values and the plurality of first measurement values.
In one embodiment, the step of obtaining the first measurement value and the plurality of point measurement values further comprises driving all of the plurality of driving electrodes simultaneously; and measuring the first sensing electrodes to obtain first measurement values of all the first nodes, and simultaneously measuring other sensing electrodes except the first sensing electrodes to obtain all the plurality of point measurement values.
In one embodiment, the method further comprises selecting another one of the plurality of sensing electrodes as the first sensing electrode to set the first sensing electrode to be a back measurement.
In one embodiment, the step of setting the first sensing electrode to be reversely measured includes electrically connecting the first sensing electrode to a reversely measuring circuit, or a processing unit reversely processes the signal received by the first sensing electrode during the measuring cycle. The touch measurement further comprises electrically connecting the rest of the plurality of sensing electrodes to a forward measurement circuit, and performing touch measurement to obtain a touch signal. The touch measurement comprises sequentially measuring with a forward measurement circuit by a reverse measurement circuit to obtain a reverse signal and a forward signal synchronously; and receiving the reverse signal and the forward signal through an analog-digital conversion circuit to obtain a touch signal, wherein the phase signals of the forward signal and the reverse signal are 180-degree offset.
In one embodiment, if the variance is higher than the threshold value, it is determined that a pointing object touches the first sensing electrode.
In one embodiment, if the variance is lower than the threshold value, it is determined that a non-pointing object touches the first sensing electrode.
In order to achieve one or a part or all of the above or other objects, an embodiment of the invention provides a sensing module of a touch recognition device, including: a plurality of sensing electrodes including a first sensing electrode configured for reverse measurement; a plurality of driving electrodes intersecting the plurality of sensing electrodes and having a plurality of nodes, and intersecting the first sensing electrodes and having a plurality of first nodes; and a processing unit electrically connected with the plurality of driving electrodes and the plurality of sensing electrodes for driving one or more driving electrodes, measuring the first sensing electrode to obtain a first measurement value of one or more first nodes, and measuring the sensing electrodes except the first sensing electrode to obtain a plurality of point measurement values of a plurality of nodes; wherein the processing unit compares each point measurement value on the same driving electrode with a variation value of each first measurement value respectively; the processing unit checks whether the variation value is higher than or lower than a threshold value; if the variation value is higher or lower than the threshold value, the processing unit judges that the sensing electrode on the point measurement value is abnormal; and stopping a touch measurement by the processing unit when the at least one variant is higher or lower than the threshold value. And if the variation value is not higher than or lower than the threshold limit value or the number of abnormal sensing electrodes is not two, the processing unit performs touch measurement.
[ description of the drawings ]
Fig. 1 is a schematic diagram of a sensing module applied to a touch recognition device according to a first embodiment of the invention.
Fig. 2 is a flowchart of a sensing method applied to a touch recognition device in an embodiment of the invention.
Fig. 3 is a schematic diagram of a sensing module applied to a touch recognition device according to a first embodiment of the invention.
Fig. 4 is a schematic diagram of a sensing module applied to a touch recognition device according to a second embodiment of the invention.
Description of the reference numerals
100. 200 sense module
110. 210 processing unit
120 (D1-D7), 220 (225A-225D) drive electrodes
130 (S1-S4), 230 (S1-S7) sense electrodes
[ detailed description ] of the invention
It will be appreciated by those of ordinary skill in the art that the steps included in the method according to the embodiments of the present invention may not be performed in the order shown in the embodiments, and the present invention is not limited to the order in which the steps are performed, unless there is a dependency relationship between the steps specifically described. In addition, other steps may be inserted between the steps without affecting the spirit provided by the present invention. Such derived implementations are also within the scope of the present invention.
Referring to fig. 1, a sensing module 100 of a touch recognition device according to a first embodiment of the invention is shown. The sensing module 100 of the touch recognition device comprises a processing unit 110, a plurality of driving electrodes 120 and a plurality of sensing electrodes 130. In the present embodiment, the driving electrode 120 includes at least 7 driving electrodes D1-D7, and the sensing electrode 130 includes at least 4 sensing electrodes S1-S4. The plurality of driving electrodes 120 intersect the plurality of sensing electrodes 130 and have a plurality of nodes D1S1, D1S2, D1S3, D1S4, D2S1, D2S2 …, etc. The processing unit 110 is electrically connected to the sensing electrode 130 and the driving electrode 120, and is used for driving the driving electrode 120 and sensing the capacitance variation on the sensing electrode 130 to obtain a plurality of point measurement values of a plurality of nodes.
The above-mentioned sensing module 100 is used for executing a sensing method of a touch recognition device in the following embodiments of the present invention.
Fig. 2 is a flow chart of a sensing method of a touch recognition device according to an embodiment of the invention, and is described with reference to fig. 3 and fig. 4. The sensing method of the embodiment of the invention comprises the following steps S100-S700 to execute the judging procedure and cooperatively execute the touch measurement.
Step S100: a first one of the plurality of sense electrodes S1-S4 is selected. In this embodiment, the sensing electrode S1 is selected as the first sensing electrode in advance, and the sensing electrode S1 is set for use as the reverse measurement. The first sensing electrode S1 intersects with the plurality of driving electrodes D1-D7 to have a plurality of first nodes D1S1, D2S1, D3S1 …, etc. The step of setting the sensing electrode S1 as the inverse measurement includes electrically connecting the sensing electrode S1 to an inverse measurement circuit, so that the processing unit 110 can perform inverse processing, such as multiplying a negative sign, on the signal received by the first sensing electrode S1 in the measurement cycle, thereby saving the operation time.
Step S200: one or more driving electrodes are driven, the first sensing electrodes are measured to obtain measured values of one or more first nodes, and other sensing electrodes except the first sensing electrodes are measured to obtain a plurality of point measured values of a plurality of other nodes. In this embodiment, the point measurement values or the first node measurement value of the plurality of nodes is a variation value generated by the periodic wave driving.
In one embodiment, the step of obtaining the first measurement value and the plurality of point measurement values further comprises: driving one or a portion of the drive electrodes; measuring the first sensing electrode to obtain a first measurement value of one or more first nodes, and simultaneously or sequentially measuring other sensing electrodes except the first sensing electrode to obtain one or a part of a plurality of point measurement values; stopping driving; driving another one or the rest of the plurality of driving electrodes; measuring the first sensing electrode to obtain a first measurement value of one or more first nodes, and simultaneously or sequentially measuring other sensing electrodes except the first sensing electrode to obtain another one or the rest of the plurality of point measurement values; and repeating the driving operation to obtain all the point measurement values and the first measurement values.
In the first embodiment, as shown in fig. 3, the driving electrode D1 is driven by the precursor to sequentially obtain the measured values of the nodes D1S1, D1S2, D1S3, and D1S4, which include a first measured value of the first node D1S 1. Then, the driving electrode D2 is sequentially driven along the arrow direction to obtain the point measurement values of the different nodes D2S1, D2S2, D2S3, D2S4, including the first measurement value of the first node D2S 1. Then, the driving electrodes D3 and D4 are sequentially driven to obtain the point measurement values of all the nodes D3S1, D3S2, D3S3, D3S4, D4S1, D4S2, D4S3, and D4S 4.
Fig. 4 is a schematic diagram of a sensing module 200 of a touch recognition device according to a second embodiment of the invention. The sensing module 200 includes a processing unit 210, a plurality of driving electrodes 220, and a plurality of sensing electrodes 230. The processing unit 210 is electrically connected to the sensing electrode 230 and the driving electrode 220. In the present embodiment, the driving electrode 220 is divided into four parts, namely the first part driving electrodes 225A-225D, and the sensing electrode 230 comprises at least 7 sensing electrodes S1-S7. The plurality of driving electrodes 220 intersect the plurality of sensing electrodes 230 to have a plurality of nodes, and the selected sensing electrode S1 is still the first sensing electrode. In the second embodiment, the first portion of the driving electrode 225A is driven to sequentially obtain the point measurement values of the different nodes 225AS1, 225AS2, 225AS3 and …, which includes a first measurement value of the first node D1S 1. Then, the second part of driving electrode 225B is sequentially driven along the arrow direction, and the third part of driving electrode 225C and the fourth part of driving electrode 225D are driven, so as to obtain the point measurement values of all the nodes.
In the above embodiment of the step S200, the present invention is not limited to obtaining all the point measurement values and the first measurement values in the step S200, and may first perform one or a part of driving the driving electrodes and obtain the first measurement values of the first sensing electrodes and the point measurement values of the plurality of nodes of one or a part of the sensing electrodes, and then go to the next steps S300-S400, and return to the step S200 to obtain all the point measurement values and the first measurement values.
In one embodiment, referring to fig. 3 again, the driving electrode D1 is driven first, and the measured values of the points of the different nodes D1S1, D1S2, D1S3, and D1S4 are sequentially obtained, which includes a first measured value of the first node D1S 1. Then, the driving electrode D4 is directly jumped and selected for the second time along the direction of the large black arrow to obtain the measured values of the different nodes D4S1, D4S2, D4S3, and D4S4, wherein the measured values include the first measured value of the first node D4S 1. Then, the other driving electrodes are sequentially driven by skipping. The second driving can directly jump and select the driving electrode D4, namely, the distance from the driving electrode D1 of the first driving is 3 driving electrodes apart; the invention is not limited to this embodiment, but can alternatively skip the driving electrodes D5 or D6 separated by 4-5 to speed up the response time of the sensing method.
In another embodiment, the step of obtaining the first measurement value and the plurality of point measurement values further comprises: simultaneously driving all of the plurality of driving electrodes; and measuring the first sensing electrodes to obtain first measurement values of all the first nodes, and simultaneously measuring other sensing electrodes except the first sensing electrodes to obtain all the plurality of point measurement values.
Step S300: and comparing each point measurement value on the same driving electrode with a variation value of the first measurement value. In the first embodiment shown in fig. 2, in step S200, after driving the driving electrode D1, the first measurement value of the first node D1S1 and the variation values of the other nodes D1S2, D1S3, D1S4 are sequentially obtained, and then step S400 is performed; or after driving the driving electrode D2, the first measurement value of the first node D2S1 and the variation values of the other nodes D2S2, D2S3, D2S4 are sequentially obtained, and then step S400 is performed.
Step S400: check whether the variation value obtained in step S300 is higher or lower than a threshold value set by the sensing module. The measured value sensed by the sensing electrode is the variation generated by the periodic wave driving, and the difference between the two is compared by steps S300-S400. When there is no touch sensing module such as a finger or a stylus, if the sensing module is to determine whether there is any other foreign object touching, the periodic wave driving variation attenuation comparison is performed, and the sensing measurement value is attenuated by touching or other non-pointing objects such as foreign objects (e.g. water stains), so the above steps are performed to observe and determine whether the attenuation is caused by the non-pointing objects. If the variation value is higher than the threshold value, the first sensing electrode is judged to be touched by the pointing object. If the variation value is lower than the threshold value, judging that a non-pointing object touches the first sensing electrode.
Step S500: if the variation value is higher or lower than the threshold value, the sensing electrode on the point measurement value is judged to be abnormal. As shown in fig. 3, since the variation values of the nodes D1S2 and D4S3 and the first nodes D1S1 and D4S1 are higher or lower than the threshold value, respectively, it is determined that the sensing electrodes S2 and S3 are abnormal. AS shown in fig. 4, since the variation values of the node areas 225AS2 and 225CS4 and the first nodes 225AS1 and 225CS1 are higher or lower than the threshold value, respectively, it is determined that the sensing electrodes S2 and S4 are abnormal.
Step S600: step S500 is continued, and when at least one variation value is higher or lower than the threshold value, touch measurement is stopped. In a preferred embodiment, the number of the sensing electrodes determined to be abnormal is at least two, and the touch measurement is stopped.
When the first sensing electrode is judged to be touched by a finger or has foreign matters on the first sensing electrode, the measurement value signal of the node obtained previously is used for covering the old point measurement value by the newly read point measurement value; or the old point measurement value can be directly discarded and not used.
Step S700: in step S600, another one of the plurality of sensing electrodes is selected as the first sensing electrode and is set as the reverse measurement. The above steps S100 to S600 are repeated to re-execute the judgment procedure.
The above-mentioned sensing method may be used for determining the program by periodic detection or real-time detection. If periodic detection is adopted, after a plurality of touch measurements are performed, the judging procedure is performed once to scan the full panel so as to confirm whether the sensing electrode selected as the reverse measurement is proper or not; if the real-time detection is adopted, judging is carried out after each periodic wave variation attenuation comparison under touch measurement. When the node signals are obtained to carry out periodic wave variation attenuation comparison, the variation value is firstly judged according to the conditions set by the touch control system to judge whether the first sensing electrode which is reversely measured is touched or not, and then other signal processing or judgment, such as point reporting, is carried out.
Step S510: in step S400, if the variance is not higher than or lower than the threshold value, or the number of abnormal sensing electrodes is not two, touch measurement is performed. In this embodiment, in addition to electrically connecting the sensing electrode S1 to a reverse measurement circuit, the touch measurement further includes: the rest of the plurality of sensing electrodes are electrically connected to a forward measuring circuit, and touch measurement is performed to obtain a touch signal. The step of performing touch measurement comprises the following steps: the reverse measurement circuit sequentially measures with the forward measurement circuit to obtain a reverse signal and a forward signal synchronously; and receiving the reverse signal and the forward signal through an analog-digital conversion circuit to obtain a touch signal, wherein the phase signals of the forward signal and the reverse signal are 180-degree offset.
The embodiment of the invention provides a sensing method and a sensing module of a touch control identification device, which can judge whether a foreign object is positioned on the touch control identification device or not when a touch control signal is read in a periodic wave variation attenuation comparison operation of executing the sensing method by periodically or real-time alternately executing a judging program, thereby improving the overall sensing accuracy.
The foregoing description is only of the preferred embodiments of the invention and is not intended to limit the scope of the invention; all equivalent changes or modifications that come within the spirit of the disclosure are to be understood as being embraced within the scope of the following claims.
Claims (13)
1. A sensing method of a touch recognition device, wherein the touch recognition device includes a plurality of sensing electrodes and a plurality of driving electrodes, the plurality of sensing electrodes and the plurality of driving electrodes intersect and have a plurality of nodes, the sensing method comprising the steps of:
selecting a first sensing electrode of the plurality of sensing electrodes, and setting the first sensing electrode to be reversely measured, wherein the first sensing electrode intersects with the plurality of driving electrodes to have a plurality of first nodes;
driving one or more driving electrodes, measuring the first sensing electrode to obtain a first measurement value of one or more first nodes, and measuring the sensing electrodes except the first sensing electrode to obtain a plurality of point measurement values of the plurality of nodes;
comparing a variation value between each point measurement value and the first measurement value on the same driving electrode;
checking whether the variance is above or below a threshold value;
if the variation value is higher than or lower than the threshold value, judging that the sensing electrode on the point measurement value is abnormal; the method comprises the steps of,
and stopping touch measurement when at least one variation value is higher or lower than the threshold value.
2. The method of claim 1, wherein the touch measurement is stopped when the number of the sensing electrodes is at least two.
3. The method of claim 1, wherein the touch measurement is performed if the variance is not higher than or lower than the threshold value or the number of anomalies in the sensing electrode is less than two.
4. The method of claim 1, wherein the step of obtaining the first measurement value and the plurality of point measurements further comprises:
driving one or a portion of the plurality of drive electrodes;
measuring the first sensing electrode to obtain the first measurement value of one or more first nodes, and simultaneously or sequentially measuring the sensing electrodes except the first sensing electrode to obtain one or a part of the plurality of point measurement values;
stopping driving;
driving another or the remaining portion of the plurality of driving electrodes;
measuring the first sensing electrode to obtain the first measurement value of one or more first nodes, and simultaneously or sequentially measuring the other sensing electrodes except the first sensing electrode to obtain another one or the rest of the plurality of point measurement values; the method comprises the steps of,
repeating the driving operation to obtain all the plurality of point measurement values and the plurality of first measurement values.
5. The method of claim 1, wherein the step of obtaining the first measurement value and the plurality of point measurements further comprises:
simultaneously driving all of the plurality of driving electrodes;
measuring the first sensing electrode to obtain the first measurement value of all the first nodes; the method comprises the steps of,
simultaneously measuring the sensing electrodes except the first sensing electrode to obtain all the plurality of point measurement values.
6. The method of claim 1, further comprising selecting another one of the plurality of sense electrodes as the first sense electrode to set the first sense electrode to a reverse measurement.
7. The method of claim 1, wherein the step of providing the first sensing electrode as a reverse measurement comprises electrically connecting the first sensing electrode to a reverse measurement circuit or a processing unit reversing the signal received via the first sensing electrode during the measurement cycle.
8. The method of claim 7, further comprising electrically connecting the remaining ones of the plurality of sensing electrodes to a forward measuring circuit and performing the touch measurement to obtain a touch signal.
9. The method for sensing according to claim 8, wherein the step of touch measurement comprises:
the reverse measurement circuit sequentially measures with the forward measurement circuit to synchronously obtain a reverse signal and a forward signal respectively; the method comprises the steps of,
the reverse signal and the forward signal are received by an analog-digital conversion circuit to obtain a touch signal, wherein the phase signals of the forward signal and the reverse signal are 180-degree offset.
10. The method of claim 1, wherein if the variance is higher than the threshold value, determining that a pointing object touches the first sensing electrode.
11. The method of claim 1, wherein if the variance is less than the threshold value, determining that a non-pointing object touches the first sensing electrode.
12. A sensing module of a touch recognition device, comprising:
a plurality of sensing electrodes including a first sensing electrode configured for reverse measurement;
a plurality of driving electrodes intersecting the plurality of sensing electrodes to have a plurality of nodes, intersecting the first sensing electrodes to have a plurality of first nodes; the method comprises the steps of,
the processing unit is electrically connected with the plurality of driving electrodes and the plurality of sensing electrodes and is used for driving one or more driving electrodes, measuring the first sensing electrode to obtain a first measurement value of one or more first nodes, and measuring the sensing electrodes except the first sensing electrode to obtain a plurality of point measurement values of the plurality of nodes;
the method is characterized in that: the processing unit compares each point measurement value on the same driving electrode with a variation value of each first measurement value; the processing unit checks whether the variance is above or below a threshold value; if the variation value is higher than or lower than the threshold value, the processing unit judges that the sensing electrode on the point measurement value is abnormal; and stopping a touch measurement by the processing unit when at least one of the variants is higher or lower than the threshold value.
13. The sensing module of claim 12, wherein the processing unit performs the touch measurement if the variance is not higher than or lower than the threshold value or if the number of abnormal sensing electrodes is less than two.
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