CN110633020B - Sensing method of touch control identification device and sensing module thereof - Google Patents

Abstract

The invention discloses a sensing method of a touch identification device, which comprises the following steps: selecting a first sensing electrode of the plurality of sensing electrodes by the processing unit and setting the first sensing electrode as a reference electrode; performing a conventional measurement cycle by the processing unit to obtain a sensing reading value; judging whether the first sensing electrode is abnormal or not according to the sensing reading value; and when the first sensing electrode is abnormal and a touched point is arranged on the driving electrode intersected with the first sensing electrode, executing a selected reference electrode program through the processing unit to replace the first sensing electrode. The invention executes the judgment program in the general periodic wave difference comparison operation of the sensing method through the periodicity or the real-time alternation, and in addition, the new reference electrode selection method of the invention is used for carrying out operation compensation on the disturbed section, complementing the disturbed section as a correct read value, and obtaining the correct original read value through a full FRAME (FRAME). Therefore, the noise interference of the reference electrode is quickly solved, and the overall sensing accuracy is improved.

Description

Sensing method and sensing module of touch recognition device

【Technical field】

The present invention relates to a sensing method of a touch recognition device and a sensing module thereof, in particular to a sensing method for judging whether a finger or a foreign object is located on a reference electrode on a touch recognition device when a touch signal is read. And its sensing module, how to quickly correct and improve the overall sensing accuracy.

【Background technique】

Touch panel or touch screen is one of the main modern human-machine interfaces. As a position recognition device, it can skillfully combine input and display interfaces, so it has the advantages of saving device space and humanized operation, and has been widely used at present. On various consumer or industrial electronic products. Examples: personal digital assistant (personal digital assistant, PDA), palm-sized PC (palm-sized PC), tablet computer (tablet computer), mobile phone (mobile phone), information appliance (Information Appliance), sales teller machine (Point-Of-Sale) , POS) and other devices.

The existing capacitive touch panel includes a data processing module, a driving electrode and a sensing electrode, etc., wherein the driving electrode and the sensing electrode are electrically connected to 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 parallel sensing electrode strips, 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 an induced charge and has an alternating capacitance, and a plurality of driving electrode strips and a plurality of sensing electrode strips form a plurality of electric fields, so It can be simulated that each intersection has an interaction capacitance, and a plurality of intersections forms an array of interaction capacitance. In a steady-state environment, the interactive capacitance array has a stable capacitance (hereinafter referred to as the base capacitance), so that the sensing electrode generates an induced voltage (the induced voltage at this time is called the base voltage), and the data processing module reads it through its interface. inductive voltage. When a finger or other conductive substance approaches the intersection, it will change the electric field there, resulting in a change in the induced voltage. After the changed induced voltage is transmitted to the data processing module, it is converted into a digital signal by the analog-to-digital converter, and then the algorithm is used to identify whether it is a touch signal, to determine whether to perform the calculation of the touch position, and then process it to form a signal to the host The touch information input data output by the terminal. Wherein, the host end is a device controlled by at least one central processing unit (CPU), such as a computer, a PDA, and the like.

Since the electric field formed between the driving electrode and the sensing electrode is easily disturbed by external electromagnetic waves, etc., it is impossible to accurately measure the change in the amount of charge transferred by capacitive charging caused by conductive substances such as fingers. Therefore, in the prior art, there is a method of subtracting the noise by signal subtraction, which repeats a measurement cycle to obtain more than two different sensing voltage signals and then subtracts them. The differential method (deferential) is used to process two or more different sensing voltage signals to obtain a touch signal that eliminates common mode noise. Although the general difference method can eliminate the background noise, it needs two pairs of sensing signals to calculate the difference value. There may be fingers or foreign objects in the measurement process, which will affect the back-end calculation. For example, the difference method is used to calculate. Decrease in accuracy or resolution.

【Content of invention】

In order to overcome the above-mentioned shortcomings of the prior art, the present invention provides the following various embodiments to solve the above-mentioned problems.

An embodiment of the present invention provides a touch recognition device using a reference electrode for sensing method and its sensing module. A judging program is executed periodically or in real time in the general periodic wave difference comparison operation of the sensing method. Read Take and distinguish the disturbed and disturbed section of a first reference electrode, and find a second sensing electrode that is disturbed in the aforementioned disturbed section through the new reference electrode selection method in the present invention, and supply Continue as the second reference electrode for replacement; use the second reference electrode to read the original disturbed area, do calculation compensation for the disturbed area, and make up for the correct read value of the disturbed area, and the whole frame (FRAME ) to get the correct reset reading. Therefore, the noise interference of the reference electrode is quickly resolved, thereby improving the overall sensing accuracy.

The touch recognition device presets thresholds for correct touch and no touch. After the setting of the previous item is completed, the routine measurement can be started, which is based on a set of read sensing values obtained by using the first reference electrode; the continuation of the previous item is a default threshold value inspection procedure to mark the disturbed section, That is to say, use this default threshold value inspection program to judge whether the first sensing electrode (first reference electrode) is abnormal; Limit value, select other reference electrodes, each driving electrode in this section determines a sensing electrode which is in line with the undisturbed condition, and makes it a second reference electrode; and with this second reference electrode, as The reference electrode for the second reading; use the pre-stored vector difference to make corrections in the first and second readings to obtain the correct reading value of the full frame return; return to normal reading.

In order to achieve one or part or all of the above objectives or other objectives, an embodiment of the present invention provides a sensing method of a touch recognition device and a sensing module thereof, wherein the touch recognition device includes a plurality of sensing electrodes, a plurality of There are a plurality of driving electrodes and a processing unit electrically connected to the plurality of driving electrodes and the plurality of sensing electrodes. The plurality of sensing electrodes intersect with the plurality of driving electrodes to have a plurality of nodes.

The steps of executing the sensing method by the sensing module include: selecting a first sensing electrode among the plurality of sensing electrodes through the processing unit and setting it as a first reference electrode; performing a measurement cycle through the processing unit to Obtaining sensing readings of a plurality of nodes; judging whether the first sensing electrode is abnormal according to the plurality of sensing readings; If there is a touched point, the processing unit executes a process of selecting a new reference electrode to replace the first sensing electrode.

Wherein, the processing unit executes the program of selecting the reference electrode including: finding a plurality of nodes where the driving electrode on the touched point intersects with other plurality of sensing electrodes to define as a plurality of candidate nodes, wherein the plurality of defined The sensing reading value of the candidate node must meet an ideal base value; determine whether the sensing reading value of the candidate node minus the sensing reading value of the touched point meets a critical value, and define the candidate node meeting the critical value as a a perfect node; and selecting a sensing electrode closest to the first sensing electrode to replace the first sensing electrode according to the sensing electrode where the perfect node is located.

In one embodiment, the step of judging whether the first sensing electrode is abnormal, that is, the default threshold value inspection program includes: calculating the sensing reading value of each node on the same driving electrode, which is respectively compared with the first sensing electrode A difference value between the sensing reading values of the nodes on the measuring electrodes; comparing whether the difference value is higher or lower than a threshold value; and, if the difference value is higher or lower than the threshold value, then judge the first sensing Electrodes are abnormal.

In one embodiment, when the first sensing electrode is determined to be abnormal, the measurement cycle performed by setting the first sensing electrode as the reference electrode is stopped.

In one embodiment, before performing the measurement cycle, a base measurement is performed in an ideal environment where the non-directional component touches the touch recognition device, so as to obtain the sensing reading values of all the plurality of nodes, and calculate the ideal base value.

In one embodiment, the condition of meeting the ideal base value is defined as being within plus or minus 10% of the ideal base value.

In one embodiment, the touch recognition device further includes providing a central processing module electrically connected to the processing unit. The central processing module includes a plurality of registers, and the central processing module uses the plurality of registers to record the corresponding driving electrodes with touched points, wherein the unit of the plurality of registers is a vector of n bits (bits) , and the number of multiple registers is related to the number of multiple driving electrodes, when the difference of the sensing reading value of the candidate node does not meet the critical value, the bit (bit) of the register is recorded as 1; when the sensing value of the candidate node If the difference of the reading value meets the critical value, the bit (bit) record of the register is 0.

【Description of drawings】

FIG. 1 is a schematic diagram of a sensing module applied to a touch recognition device in an embodiment of the present invention.

FIG. 2 is a schematic diagram of a sensing module applied to a touch recognition device in an embodiment of the present invention.

FIG. 3 is a flow chart of a sensing method applied to a touch recognition device in an embodiment of the present invention.

FIG. 4 is a flowchart of a method for judging whether a first sensing electrode is abnormal in an embodiment of the present invention.

Explanation of reference numbers

100 sensing modules

110 processing units

120. D1-D7 driving electrodes

130. S1-S4 sensing electrodes

D1S1, D1S2, D1S3, D1S4, D2S1, D2S2… nodes

【Detailed ways】

Those of ordinary skill in the art can understand that the execution order of the various steps included in the method provided by the embodiment of the present invention does not necessarily follow the order shown in the embodiment, unless there is a specifically stated dependency between the various steps, otherwise the The invention does not limit the execution order of the various steps. Besides, other steps may be inserted between each step without affecting the spirit provided by the present invention. Implementation examples derived in this way also fall within the scope of the present invention.

Please refer to FIG. 1 , which is a sensing module 100 of a touch recognition device in a first embodiment of the present invention. A sensing module 100 of a touch recognition device includes a processing unit 110 , a plurality of driving electrodes 120 and a plurality of sensing electrodes 130 . In this embodiment, the driving electrodes 120 include at least seven driving electrodes D1-D7, and the sensing electrodes 130 include at least four sensing electrodes S1-S4. The plurality of driving electrodes 120 intersect with the plurality of sensing electrodes 130 to have a plurality of nodes D1S1 , D1S2 , D1S3 , D1S4 , D2S1 , D2S2 . . . and so on. The processing unit 110 is electrically connected to the sensing electrode 130 and the driving electrode 120 for driving the driving electrode 120 and sensing the capacitance change 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 to implement a sensing method of a touch recognition device in the following embodiments of the present invention.

Please refer to FIG. 3 and FIG. 4 , which are schematic flow charts of a sensing method of a touch recognition device in an embodiment of the present invention, and are described in conjunction with the first and second embodiments in FIG. 1 and FIG. 2 . The sensing method of the embodiment of the present invention includes the following steps S100-S160 to execute the process of determining and selecting the reference electrode for touch measurement.

Step S100 : Before performing the measurement cycle, perform a base measurement in an ideal environment where the non-directional component touches the touch recognition device, so as to obtain the sensing reading values of all the plurality of nodes, and calculate an ideal base value. According to the sensing readings of all the plurality of nodes, the ideal base value calculated may be the average value of the sensing readings of all nodes, but the present invention is not limited to the calculation method of using the average value as the ideal base value.

Step S110: Select a first sensing electrode among the plurality of sensing electrodes S1-S4. In this embodiment, the sensing electrode S1 is preselected as the first sensing electrode, and the sensing electrode S1 is set as the reference electrode for use. The first sensing electrode S1 intersects with the plurality of driving electrodes D1-D7 to have a plurality of first nodes D1S1, D2S1, D3S1, . . . and so on. In one embodiment, the step of setting the sensing electrode S1 as the reference electrode includes electrically connecting the sensing electrode S1 to a reference electrode circuit, so that the processing unit 110 can use the first The signal received by the sensing electrode S1 is reversely processed, such as multiplied by a negative sign, to save computing time.

Step S120: Driving one or more driving electrodes, and measuring the sensing electrodes to obtain sensing reading values of one or more nodes. In this embodiment, the sensing readings of the plurality of nodes are variation values generated by periodic wave driving.

In one embodiment, the step of obtaining the sensing reading value further includes: driving one or a part of the plurality of driving electrodes; measuring one or a part of the sensing electrodes simultaneously or sequentially to obtain one or one Sensing reading values of the above nodes; stop driving; drive another or other part of a plurality of driving electrodes; simultaneously or sequentially measure another or another part of the sensing electrodes to obtain another or other part of the node Sensing read values; and repeating the above driving action to obtain the sense read values of all nodes. In another embodiment, the step of obtaining sensing readings further includes: simultaneously driving all of the plurality of driving electrodes; and measuring all sensing electrodes to obtain sensing readings of all nodes.

In one embodiment, as shown by the hollow arrow in FIG. 1 , the driving electrode D1 is driven first, and the sensing reading values of different nodes D1S1 , D1S2 , D1S3 , and D1S4 are sequentially obtained. Next, drive the driving electrode D2 sequentially in the direction of the arrow to obtain sensing reading values of different nodes D2S1 , D2S2 , D2S3 , and D2S4 . Then, the driving electrodes D3 and D4 are sequentially driven to obtain sensing reading values of the nodes D3S1 , D3S2 , D3S3 , D3S4 , D4S1 , D4S2 , D4S3 , and D4S4 .

In another embodiment, as shown by the solid arrow in FIG. 1 , the driving electrode D1 is first driven to sequentially obtain sensing reading values of different nodes D1S1 , D1S2 , D1S3 , and D1S4 . Next, following the direction of the large solid arrow, the driving electrode D4 is directly skipped for the second time to obtain the sensing reading values of different nodes D4S1 , D4S2 , D4S3 , and D4S4 . Then, continue to skip and drive other driving electrodes. Wherein, the second driving can directly skip the driving electrode D4, that is, the distance from the driving electrode D1 of the first driving is separated by 3 driving electrodes; 4-5 driving electrodes D5 or D6 are provided to speed up the response time of the sensing method.

The present invention is not limited to obtaining all the sensing reading values in this step, one or a part of the driving electrodes can be driven first, and the sensing reading values of some nodes can be obtained, and then the next step S130 can be continued , and return to step S120 to obtain all sensing readings.

Step S130: Determine whether the first sensing electrode is abnormal. As shown in FIG. 3 , the flow chart of the judging program includes steps S131 to S134.

Step S131: Calculate the difference between the sensing reading value of each node on the same driving electrode and the sensing reading value of the first node on the first sensing electrode S1. As shown in FIG. 1 , in step S120, after driving the driving electrode D1, the difference values between the sensing reading values of the first node D1S1 and the sensing reading values of other nodes D1S2, D1S3, and D1S4 are sequentially obtained, Then proceed to step S132; or after driving the driving electrode D2 again, sequentially obtain the difference values between the sensing reading values of the first node D2S1 and the sensing reading values of other nodes D2S2, D2S3, and D2S4, and then continue . The sensing readings induced by the above-mentioned sensing electrodes are variations generated by periodic wave driving, and this step is used to calculate and compare the difference between the two.

Step S132 : Check whether the difference obtained in step S131 is higher or lower than a threshold set by the sensing module 100 . When a non-pointing object such as a finger or a stylus touches the sensing module, if the sensing module wants to determine whether there are other foreign objects touching the reference electrode, it is to determine whether the sensing electrode is disturbed and its disturbed section , it is to compare the attenuation of periodic wave drive variation, because the sensing reading value will be attenuated by other foreign objects and other non-pointing objects (such as water stains, sweat stains, dirt), so the above steps are to observe and judge whether the attenuation is caused by non-pointing objects. caused by pointing to the object. If the difference value is higher than the threshold value, it is determined that there is a pointing object touching the first sensing electrode. If the difference value is lower than the threshold value, it is determined that a non-pointing object touches the first sensing electrode.

Step S133: When the difference value is higher or lower than the threshold value, it is determined that the first sensing electrode S1 is abnormal. As shown in FIG. 1 , since the difference between the node D3S2 and the first node D3S1 is higher or lower than the threshold value, it is determined that the first sensing electrode S1 is abnormal. As for the difference values between the nodes D1S2 , D1S3 , D1S4 and the first node D1S1 respectively are higher or lower than the threshold value, it is also determined that the first sensing electrode S1 is abnormal. As shown in Figure 2, except that the difference values between nodes D1S2, D1S3, D1S4 and the first node D1S1 are all higher or lower than the threshold value, the difference values between nodes D4S2, D4S3, D4S4 and the first node D4S1 are also high It is at or below the threshold value, so it is judged that the first sensing electrode S1 is abnormal.

Step S134: At the same time, when the first sensing electrode is determined to be abnormal, the sensing module may selectively stop the touch measurement cycle performed by setting the first sensing electrode as a reference electrode. When it is judged that the first sensing electrode is touched by a finger or there is a foreign object on it, the sensing reading signal of the previously obtained node is overwritten with the new sensing reading value to the old sensing reading value ; Or the old sensing reading can be directly discarded and not used.

In a preferred embodiment, when at least one difference value is higher or lower than a threshold value, the touch measurement cycle is stopped. In another embodiment, on the same driving electrode, if the number of sensing nodes whose difference value is higher or lower than the threshold is at least two, then the touch measurement cycle is stopped.

The judging procedure in the above step S130 may adopt periodic detection or real-time detection. If periodic testing is used, after performing several measurement cycles, execute this judgment procedure once to scan the entire panel to confirm whether the sensing electrodes selected as reference electrodes are appropriate; if real-time testing is used, measure The judgment procedure is carried out after the attenuation comparison of each periodic wave variation under the cycle. Every time the node signal is obtained for periodic wave variation and attenuation comparison, the difference value is first judged according to the conditions set by the sensing module whether the first sensing electrode as the reference electrode has been touched, and whether to perform the following steps to perform a selected reference Electrode program, and then perform other signal processing or judgment, such as point reporting.

Step S140 : continue with step S130 , because when the first sensing electrode is judged to be abnormal, it is known that there is at least one touched point on the driving electrode intersected by the first sensing electrode. For example, in the first embodiment shown in FIG. 1, it can be known that the touched points on the first sensing electrode are D1S1 and D3S1; in the second embodiment of FIG. 2, it can be known that the touched points on the first sensing electrode are There are two touched points, namely D1S1 and D4S1.

Step S150 : Execute a process of selecting a reference electrode by the processing unit to replace the first sensing electrode as a reference electrode. Wherein, the processing unit executes the procedure of selecting the reference electrode including steps S151 to S154.

Step S151: According to step S140, find out the node where the driving electrode on the touched point intersects with other sensing electrodes to define as a plurality of candidate nodes, wherein the sensing reading values of the defined plurality of candidate nodes must meet a certain Ideal base value. For example, in the first embodiment shown in FIG. 1 , it can be known that the touched points on the first sensing electrode are D1S1, D3S1, and the nodes where the driving electrode where it is located intersects with other sensing electrodes are D1S2, D1S3, D1S4, D3S2-4, according to step S100, it can be known whether the sensing reading values of nodes D1S2, D1S3, and D1S4 meet the conditional definition of the ideal base value, for example, when the sensing reading values are respectively within the range of plus or minus 10% of the ideal base value, It meets the conditional definition of the ideal base value, but the definition of the present invention is not limited thereto; if the sensing reading values of the above-mentioned nodes D1S2, D1S3, and D1S4 all meet the ideal base value, they are defined as candidate nodes.

As for the second embodiment in FIG. 2, it can be known that there are two touched points on the first sensing electrode, which are D1S1 and D4S1 respectively, and the candidate node where the driving electrode where it is located may intersect with other sensing electrodes may be D1S2, D1S3, D1S4, D4S2, D4S3, D4S4. According to step S100, it can be known whether the sensing reading values of nodes D1S2, D1S3, D1S4, D4S2, D4S3, and D4S4 meet the conditional definition of the ideal base value, and are respectively located within the range of plus or minus 10% of the ideal base value; if the above nodes D1S2, If the sensing readings of D1S3, D1S4, D4S2, D4S3, and D4S4 all meet the ideal base value, they are defined as candidate nodes.

Step S152: Determine whether the sensing reading value of the candidate node minus the sensing reading value of the touched point meets a threshold value, and define the candidate node meeting the threshold value as a perfect node. That is to say, in this step, it is confirmed that the candidate node is not touched by any finger or foreign object through the condition that the candidate node meets the critical value. In this embodiment, the threshold value may be preset by the sensing module, or converted from the ideal base value in step S100 , but the present invention is not limited thereto. For example, if the candidate nodes D1S2, D1S3, and D1S4 in Figure 1 all meet the critical value, they can be defined as a perfect node; if the candidate nodes D1S2, D1S3, D1S4, D4S2, D4S3, and D4S4 in Figure 2 all meet the critical value , which can be defined as a perfect node.

The above steps S140-S152 can speed up the judgment and instruction cycle through the register of the central processing module (not shown). The central processing module is electrically connected to the processing unit 110, wherein the central processing module includes a plurality of registers, and the central processing module retains and utilizes the plurality of registers as a record of the abnormality of the driving electrodes; in other words, each register Corresponding to at least one driving electrode, the buffer first records the driving electrode with the touched point. The unit of the buffer is n bit vector, and the number of the buffer is related to the number of the driving electrodes. That is to say, when the first sensing electrode is abnormal, there is a touched point on one of the driving electrodes where the first sensing electrode intersects with it, so the central processing unit retains a buffer corresponding to the driving electrode, which has the touched point. The driving electrode of the touch point is recorded as abnormal.

After driving and measuring the signal to obtain the sensing reading value, as a result of steps S151-S152, when the difference of the sensing reading value of the candidate node does not meet the critical value, the register corresponding to the driving electrode on the candidate node The bit record of the candidate node is 0; when the difference of the sensing read value of the candidate node meets the critical value, the bit record of the register corresponding to the driving electrode on the candidate node is 1; in other words, the corresponding register There is a perfect node on the driving electrode whose bit record is 1, so only the driving electrode whose bit record is 1 needs to be acted on later, so the cycle of processing instructions can be accelerated.

Step S153: According to the sensing electrode where the perfect node is located, select the sensing electrode closest to the first sensing electrode as the reference electrode. For example, the sensing electrodes where the perfect nodes D1S2, D1S3, and D1S4 in FIG. 1 are respectively located are S2, S3, and S4, and the sensing electrode closest to the original first sensing electrode S1 is S2; The sensing electrodes where D1S3, D1S4, D4S2, D4S3, and D4S4 are respectively located are S2, S3, and S4, and the sensing electrode closest to the original first sensing electrode S1 is S2. Therefore, in the two embodiments shown in FIG. 1 and FIG. 2 , the sensing electrode S2 is selected as the reference electrode.

Step S154: replace the first sensing electrode with the sensing electrode selected in step S153. In this embodiment, the sensing reading signal of the node previously obtained through the cycle measurement of the first sensing electrode is used to cover the old sensing reading value with the newly read sensing reading value; or it can be directly Old sense readings are discarded and not used.

Step S160 : Continuing from step S130 or S154 , if there is no abnormality in the first sensing electrode, or after another sensing electrode is selected as a reference electrode, touch measurement is performed. In this embodiment, the sensing electrodes are used as reference electrodes. In addition to being electrically connected to a reference electrode circuit, the touch measurement further includes: electrically connecting the rest of the plurality of sensing electrodes to a positive measurement circuit, and perform touch measurement to obtain a touch signal. The steps of performing touch measurement include: the reference electrode circuit is sequentially measured 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-to-digital conversion circuit The forward signal is converted to obtain a touch signal, wherein the phase signals of the forward signal and the reverse signal are offset by 180 degrees.

An embodiment of the present invention provides a sensing method of a touch recognition device and a sensing module thereof. A judging program is interspersed with periodic or real-time execution in the general periodic wave difference comparison operation of the sensing method to read the resolution judgment. A disturbed and disturbed section of the first reference electrode, and through the new reference electrode selection method in the present invention, find a second sensing electrode which is disturbed in the aforementioned disturbed section, and supply the connection as a replacement The second reference electrode; with this second reference electrode, the original disturbed area is read, the disturbed area is calculated and compensated, and the disturbed area is supplemented to the correct read value, and the full frame (FRAME) can be obtained Correctly return to original reading value. Therefore, the noise interference of the reference electrode is quickly resolved, thereby improving the overall sensing accuracy.

Claims (12)

1. A sensing method for a touch recognition device, wherein the touch recognition device includes a plurality of sensing electrodes, a plurality of driving electrodes, and a processing unit electrically connected to the plurality of driving electrodes and the plurality of sensing electrodes , the plurality of sensing electrodes intersect with the plurality of driving electrodes to have a plurality of nodes, the sensing method includes: selecting a first sensing electrode among the plurality of sensing electrodes by the processing unit and setting it as a reference electrode; performing a measurement cycle through the processing unit to obtain sensing reading values of the plurality of nodes; judging whether the first sensing electrode is abnormal according to the plurality of sensing readings; and When the first sensing electrode is abnormal, and there is a touched point on one of the plurality of driving electrodes intersected by the first sensing electrode, the processing unit executes a process of selecting a reference electrode to replace the first sensing electrode; Wherein, the processing unit executing the selected reference electrode program includes: Finding out the plurality of nodes where the drive electrode intersects with the other plurality of sensing electrodes on the touched point is defined as a plurality of candidate nodes, wherein the sensing reading values of the defined plurality of candidate nodes need to be conform to an ideal base value; judging whether the sensing reading value of the candidate node minus the sensing reading value of the touched point meets a critical value, and defining the candidate node meeting the critical value as a perfect node; and According to the sensing electrode where the perfect node is located, the sensing electrode closest to the first sensing electrode is selected to replace the first sensing electrode. 2. The sensing method according to claim 1, wherein the step of judging whether the first sensing electrode is abnormal comprises: calculating a difference between the sensing reading value of each node on the same driving electrode and the sensing reading value of the node on the first sensing electrode; comparing whether the difference is above or below a threshold; and, If the difference value is higher or lower than the threshold value, it is determined that the first sensing electrode is abnormal. 3. The sensing method according to claim 1, characterized in that: when the first sensing electrode is judged to be abnormal, the measurement cycle performed by setting the first sensing electrode as a reference electrode is stopped . 4. The sensing method according to claim 1, wherein before performing the measurement cycle, a base measurement is performed under an ideal environment where the non-directional component contacts the touch recognition device, so as to obtain all the plurality of The sensing reading of the node, and calculate the ideal base value. 5. The sensing method as claimed in claim 1, wherein the condition for meeting the ideal base value is defined as being within a range of plus or minus 10% of the ideal base value. 6. The sensing method according to claim 1, further comprising providing a central processing module electrically connected to the processing unit, wherein the central processing module includes a plurality of registers, and the central processing module utilizes the plurality of registers a register, the drive electrode with the touched point is correspondingly recorded, wherein the unit of the plurality of registers is a vector of n bits, and the number of the plurality of registers is related to the number of the plurality of drive electrodes Relevant, when the difference of the sensing reading value of the candidate node does not meet the critical value, the bit record of the register is 1; when the difference of the sensing reading value of the candidate node meets the critical value, the register The bit record of is 0. 7. A sensing module of a touch recognition device, comprising: a plurality of sensing electrodes; a plurality of driving electrodes, the plurality of sensing electrodes intersecting the plurality of driving electrodes to have a plurality of nodes; and a processing unit electrically connected to the plurality of driving electrodes and the plurality of sensing electrodes; It is characterized in that: the processing unit selects a first sensing electrode among the plurality of sensing electrodes and sets it as a reference electrode; a measurement cycle is performed by the processing unit to obtain sensing reading values of the plurality of nodes ; Judging whether the first sensing electrode is abnormal according to the plurality of sensing readings; and when the first sensing electrode is abnormal, and one of the plurality of driving electrodes intersected by the first sensing electrode has a touched point, then a process of selecting a reference electrode is executed by the processing unit, so as to replacing the first sensing electrode; Wherein, the processing unit executing the program of selecting the reference electrode includes: finding the plurality of nodes where the driving electrode on the touched point intersects with the plurality of other sensing electrodes, to define as a plurality of candidate nodes, wherein The defined sensing readings of the plurality of candidate nodes need to meet an ideal base value; determine whether the sensing readings of the candidate nodes minus the sensing readings of the touched point meet a critical value, and define The candidate node meeting the critical value is a perfect node; and according to the sensing electrode where the perfect node is located, selecting the sensing electrode closest to the first sensing electrode to replace the first sensing electrode . 8. The sensing module as claimed in claim 7, wherein the step of judging whether the first sensing electrode is abnormal by the processing unit comprises: The processing unit calculates a difference value between the sensing reading value of each node on the same driving electrode and the sensing reading value of the node on the first sensing electrode; The processing unit compares whether the difference is higher or lower than a threshold; and if the difference is higher or lower than the threshold, the processing unit determines that the first sensing electrode is abnormal. 9. The sensing module according to claim 7, wherein when the first sensing electrode is judged to be abnormal, the processing unit stops the process of setting the first sensing electrode as a reference electrode. Measurement cycle. 10. The sensing module according to claim 7, wherein before the processing unit performs the measurement cycle, the processing unit performs a base measurement under an ideal environment where the non-directional component contacts the touch recognition device, The sensing reading values of all the plurality of nodes are obtained, and the ideal base value is calculated. 11. The sensing module as claimed in claim 7, wherein the condition of meeting the ideal base value is defined as being within a range of plus or minus 10% of the ideal base value. 12. The sensing module according to claim 8, further comprising a central processing module electrically connected to the processing unit, wherein the central processing module includes a plurality of registers, and the central processing module utilizes the plurality of registers A buffer, which records the corresponding driving electrode with the touched point, wherein the unit of the plurality of buffers is an n-bit vector, and the number of the plurality of buffers is related to the number of the plurality of driving electrodes , when the difference of the sensing reading value of the candidate node does not meet the critical value, the bit record of the register is 1; when the difference of the sensing reading value of the candidate node meets the critical value, the register’s The bit record is 0.

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