CN110633020B - Sensing method of touch control identification device and sensing module thereof - Google Patents
Sensing method of touch control identification device and sensing module thereof Download PDFInfo
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- CN110633020B CN110633020B CN201910425718.8A CN201910425718A CN110633020B CN 110633020 B CN110633020 B CN 110633020B CN 201910425718 A CN201910425718 A CN 201910425718A CN 110633020 B CN110633020 B CN 110633020B
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- 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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- G06F3/01—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 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
[ technical field ] A method for producing a semiconductor device
The present invention relates to a sensing method and a sensing module of a touch recognition device, and more particularly, to a sensing method and a sensing module of a reference electrode for determining whether a finger or a foreign object is located on the touch recognition device when a touch signal is read, which can quickly correct the touch signal and improve the overall sensing accuracy.
[ background of the invention ]
A touch panel or a touch screen is one of the main modern human-machine interfaces, and as a position recognition 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 device space and humanizing the operation, and is widely applied to various consumer or industrial electronic products at present. Examples are as follows: personal Digital Assistants (PDAs), palm-sized PCs (personal computers), tablet computers (tablet computers), mobile phones (mobile phones), information appliances (Information appliances), point-Of-Sale (POS), and the like.
The conventional capacitive touch panel includes a data processing module, a driving electrode, and an induction electrode, wherein the driving electrode and the induction electrode are electrically connected to the data processing module through respective interfaces. The driving electrode is composed of a plurality of mutually parallel driving electrode strips, the sensing electrode is composed of a plurality of mutually parallel sensing electrode strips, and each driving electrode strip and each sensing electrode strip are mutually vertically arranged 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 induction electrode, so that the induction electrode generates induction charges and has an interaction capacitance, the plurality of driving electrode strips and the plurality of induction electrode strips form a plurality of electric fields, each intersection can be simulated to have an interaction capacitance, and the plurality of intersections form an interaction capacitance array. The interactive capacitor array has a stable capacitance (hereinafter referred to as a substrate capacitor) in a steady-state environment, so that the sensing electrode generates a sensing voltage (the sensing voltage at this time is referred to as a substrate voltage), and the data processing module reads the sensing voltage through the interface. When a finger or other conductive substance approaches the intersection, the electric field at that location will be altered, resulting in a change in induced voltage. After the changed induced voltage is transmitted to the data processing module, the analog-to-digital converter converts the changed induced voltage into a digital signal, and then the analog-to-digital converter identifies whether the signal is a touch signal through an algorithm, determines whether to carry out calculation of a touch position, and further processes the touch signal to form touch information input data output to a host terminal. The host is a device controlled by at least one Central Processing Unit (CPU), such as a computer, PDA, etc.
Since the electric field formed between the driving electrode and the sensing electrode is easily interfered by external electromagnetic waves, the change of the charge amount transferred by capacitive charging caused by conductive materials such as fingers cannot be accurately measured. Therefore, the prior art uses a signal subtraction method to subtract the noise, which repeats a measurement cycle to obtain more than two different sensing voltage signals for further subtraction. The differential method (differential) is used to process more than two different sensing voltage signals to obtain the touch signal for eliminating the substrate noise (common mode noise). Although the general difference method can eliminate the substrate noise, the difference value is calculated by the paired sensing signals, which may cause the touch of a finger or a foreign object in the measurement process, and affect the back-end operation, such as calculation by the difference method, thereby reducing the accuracy or resolution.
[ summary of the invention ]
In order to overcome the disadvantages of the prior art, the present invention provides the following embodiments to solve the above problems.
The embodiment of the invention provides a touch control identification device which adopts a reference electrode to carry out a sensing method and a sensing module thereof, wherein a judgment program is periodically or real-timely executed in a general periodic wave difference comparison operation for executing the sensing method, and a disturbed section of a first reference electrode are read, distinguished and judged; the second reference electrode is used to read the original disturbed area, and the disturbed area is compensated by operation, so as to complement the disturbed area as the correct read value, and the correct read value can be obtained by the full FRAME (FRAME). Therefore, the noise interference of the reference electrode is rapidly solved, and the overall sensing accuracy is improved.
The touch identification device presets threshold values of correct touch, no touch and the like. Upon completion of the foregoing setup, conventional metrology can begin based on a set of read sensing values obtained using the first reference electrode; the former action is followed by a default threshold value checking program to mark the disturbed section, that is, the default threshold value checking program is used to determine whether the first sensing electrode (the first reference electrode) is abnormal; if no disturbance exists, the conventional reading is repeated, otherwise, other reference electrodes are selected for the disturbed section according to a threshold value, and each driving electrode in the section determines that a sensing electrode is suitable for the undisturbed condition and is a second reference electrode; the second reference electrode is used as a reference electrode for secondary reading; correcting in the first and second reading with pre-stored vector difference to obtain correct reading value of the whole frame; normal reading is resumed.
In order to achieve one or a part of or all of the above objectives or other objectives, an embodiment of the 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 driving electrodes, and a processing unit electrically connected to the plurality of driving electrodes and the plurality of sensing electrodes, and the plurality of sensing electrodes and the plurality of driving electrodes intersect to form a plurality of nodes.
The sensing module performs a sensing method including the steps of: selecting a first sensing electrode of the plurality of sensing electrodes through the processing unit and setting the first sensing electrode as a first reference electrode; performing a measurement cycle through the processing unit to obtain sensing readings of the plurality of nodes; judging whether the first sensing electrode is abnormal or not according to the plurality of sensing readings; and when the first sensing electrode is abnormal and one of the plurality of driving electrodes intersected with the first sensing electrode has a touched point, executing a new reference electrode selecting program through the processing unit to replace the first sensing electrode.
Wherein the processing unit executing the selected reference electrode program comprises: finding out a plurality of nodes where the driving electrodes on the touched points intersect with other plurality of sensing electrodes to define a plurality of candidate nodes, wherein the sensing readings of the defined plurality of candidate nodes need to accord with an ideal base value; judging whether the sensing reading value of the candidate node minus the sensing reading value of the touched point accords with a critical value or not, and defining the candidate node which accords with the critical value as a perfect node; and selecting the sensing electrode nearest to the first sensing electrode according to the sensing electrode where the perfect node is located so as to replace the first sensing electrode.
In one embodiment, the step of determining whether the first sensing electrode is abnormal, namely the default threshold checking procedure, includes: calculating a sensing reading value of each node on the same driving electrode, and respectively calculating 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; comparing whether the difference value is higher or lower than a threshold value; and if the difference value is higher or lower than a threshold limit value, judging that the first sensing electrode is 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 the measurement cycle, a substrate measurement is performed in an ideal environment where no pointing device is in contact with the touch recognition device to obtain sensing readings of all of the plurality of nodes, and the ideal substrate value is calculated.
In one embodiment, the condition of meeting the ideal substrate value is defined as being within plus or minus 10% of the ideal substrate value.
In an embodiment, the touch recognition device further includes a central processing module electrically connected to the processing unit. The central processing module comprises a plurality of buffers (registers), the central processing module correspondingly records the driving electrodes with touched points by using the plurality of buffers, wherein the unit of the plurality of buffers is a vector of n bits, the number of the plurality of buffers is related to the number of the plurality of driving electrodes, and when the difference of the sensing reading values of the candidate nodes does not accord with a critical value, the bit (bit) of the buffer is recorded as 1; when the difference of the sensing reading values of the candidate nodes meets the threshold value, the bit (bit) of the buffer is recorded as 0.
[ description of the drawings ]
Fig. 1 is a schematic diagram of a sensing module applied to a touch recognition device according to an embodiment of the invention.
Fig. 2 is a schematic diagram of a sensing module applied to a touch recognition device according to an embodiment of the invention.
Fig. 3 is a flowchart of a sensing method applied to a touch recognition device according to an embodiment of the present invention.
FIG. 4 is a flowchart illustrating a method for determining whether the first sensing electrode is abnormal according to an embodiment of the present invention.
Description of the reference numerals
100 sensing module
110 processing unit
120. D1-D7 drive electrodes
130. S1-S4 sensing electrode
D1S1, D1S2, D1S3, D1S4, D2S1, D2S2 … nodes
[ detailed description ] embodiments
It will be understood by those of ordinary skill in the art that the method provided by the embodiments of the present invention includes steps which are not necessarily performed in the order shown in the embodiments, and the present invention does not limit the order of execution of the steps unless there is a particular dependency between the steps. In addition, other steps may be inserted between the various steps without affecting the spirit provided by the present invention. The embodiments thus derived are also intended to fall within the scope of the present invention.
Referring to fig. 1, a sensing module 100 of a touch recognition device in a first embodiment of the invention is shown. 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 the present embodiment, the driving electrodes 120 include at least 7 driving electrodes D1-D7, and the sensing electrodes 130 include at least 4 sensing electrodes S1-S4. The plurality of driving electrodes 120 and the plurality of sensing electrodes 130 intersect to 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 configured to drive the driving electrode 120 and sense a capacitance change on the sensing electrode 130 to obtain a plurality of point measurement values of a plurality of nodes.
The sensing module 100 is used for executing a sensing method of a touch recognition device in the following embodiments of the present invention.
Referring to fig. 3 and fig. 4, a flow chart of a sensing method of a touch recognition device according to an embodiment of the present invention is shown, and is described with reference to the first and second embodiments in fig. 1 and fig. 2. The sensing method of the embodiment of the invention includes the following steps S100 to S160 to execute the procedures of determining and selecting the reference electrode for touch measurement.
Step S100: before the measurement cycle, a substrate measurement is executed under an ideal environment where the non-directional component is contacted with the touch identification device, so as to obtain sensing reading values of all the plurality of nodes, and an ideal substrate value is obtained through calculation. The ideal base value calculated according to the sensing readings of all the plurality of nodes may be an average value of the sensing readings of all the nodes, but the present invention is not limited to the calculation method using the average value as the ideal base value.
Step S110: a first sensing electrode of the plurality of sensing electrodes S1-S4 is selected. In the present embodiment, the sensing electrode S1 is selected as the first sensing electrode in advance, 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 …, etc. 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 perform a reverse processing on the signal received by the first sensing electrode S1 in the measurement cycle, for example, multiplying the signal by a negative sign, to save the operation time.
Step S120: one or more driving electrodes are driven, and the sensing electrodes are measured to obtain sensing readings of one or more nodes. In this embodiment, the sensing readings of the plurality of nodes are variations generated by the periodic wave driving.
In one embodiment, the step of obtaining the sensing reading further comprises: driving one or a part of the plurality of driving electrodes; simultaneously or sequentially measuring one or a part of the sensing electrodes to obtain sensing reading values of one or more nodes; stopping driving; driving another or the rest of the plurality of driving electrodes; simultaneously or sequentially measuring another or another part of the sensing electrodes to obtain sensing reading values of another or other part of the nodes; and repeating the driving action to obtain the sensing read values of all the nodes. In another embodiment, the step of obtaining the sensing reading further comprises: simultaneously driving all of the plurality of driving electrodes; and measuring all the sensing electrodes to obtain sensing reading values of all the nodes.
In one embodiment, as shown by the hollow arrows in fig. 1, the driving electrode D1 is activated to obtain sensing readings of different nodes D1S1, D1S2, D1S3, and D1S4 in sequence. Then, the driving electrode D2 is sequentially driven along the arrow direction to obtain sensing read values of different nodes D2S1, D2S2, D2S3, and D2S 4. Then, the driving electrodes D3 and D4 are sequentially driven to obtain the sensing readings of the nodes D3S1, D3S2, D3S3, D3S4, D4S1, D4S2, D4S3, D4S4.
In another embodiment, as shown by the solid arrows in FIG. 1, the driving electrode D1 is activated for the first time, and the sensing readings of the different nodes D1S1, D1S2, D1S3, D1S4 are obtained sequentially. Then, the driving electrode D4 is directly selected and driven for the second time following the solid arrow direction, so as to obtain the sensing read values of the different nodes D4S1, D4S2, D4S3, D4S4. Then, the skip-select driving is continued to the other driving electrodes. The second driving can directly jump and select the driving electrode D4, namely the driving electrode D1 is driven for the first time, and 3 driving electrodes are separated; the present invention is not limited to this embodiment, and the driving electrodes D5 or D6 with 4-5 phase differences can be selected or skipped to speed up the response time of the sensing method.
The present invention is not limited to obtaining all the sensing readings in this step, one or a part of the driving electrodes may be driven first, and the sensing readings of a part of the nodes may be obtained, and then the next step S130 may be continued, and the step S120 may be performed again to obtain all the sensing readings.
Step S130: whether the first sensing electrode is abnormal or not is judged. Fig. 3 is a flow chart of the determination procedure, which includes steps S131 to S134.
Step S131: the difference between the sensing read value of each node on the same driving electrode and the sensing read value of the first node on the first sensing electrode S1 is calculated. As shown in fig. 1, after the driving electrode D1 is driven in step S120, the sensing readings of the first node D1S1 and the other nodes D1S2, D1S3, and D1S4 are sequentially obtained, and then step S132 is performed; or after the driving electrode D2 is driven again, the difference between the sensing read value of the first node D2S1 and the sensing read values of the other nodes D2S2, D2S3, and D2S4 is sequentially obtained, and the process is continued. The sensing reading value sensed by the sensing electrode is the variation generated by the periodic wave drive, and the difference between the sensing reading value and the variation is calculated and compared by utilizing the step.
Step S132: it is checked whether the difference obtained in step S131 is higher or lower than a threshold value set by the sensing module 100. When no pointing object, such as a finger or a touch pen, touches the sensing module, if the sensing module determines whether there is a touch of other foreign objects on the reference electrode, i.e., whether the sensing electrode has a disturbed section, the periodic wave driving variation attenuation comparison is performed, since the sensing reading value is attenuated by a non-pointing object (such as water stain, sweat stain, dirt) such as other foreign objects, the above steps are performed to observe and determine whether the attenuation is caused by the non-pointing object. If the difference value is higher than the threshold value, it is judged that the pointing object touches 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, the first sensing electrode S1 is determined to be 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, the first sensing electrode S1 is determined to be abnormal. The difference between the nodes D1S2, D1S3, and D1S4 and the first node D1S1 is higher or lower than the threshold, so that the first sensing electrode S1 is determined to be abnormal. As shown in fig. 2, except that the difference values between the nodes D1S2, D1S3, and D1S4 and the first node D1S1 are all higher or lower than the threshold, the difference values between the nodes D4S2, D4S3, and D4S4 and the first node D4S1 are also all higher or lower than the threshold, so as to determine that the first sensing electrode S1 is abnormal.
Step S134: meanwhile, 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 the reference electrode. When the first sensing electrode is touched by a finger or foreign matters are judged on the first sensing electrode, the sensing reading value signals of the nodes obtained previously are covered by the sensing reading value read newly; or the old sensing readings can be discarded directly for non-use.
In a preferred embodiment, the touch measurement cycle is stopped when at least one of the difference values is higher or lower than a threshold value. In another embodiment, on the same driving electrode, the number of sensing nodes with the difference value higher or lower than the threshold value is at least two, and the touch measurement cycle is stopped.
The above-mentioned determination procedure in step S130 may adopt periodic detection or real-time detection. If periodic detection is adopted, after a plurality of measurement cycles are executed, the judging program is executed once to scan the whole panel so as to confirm whether the sensing electrode selected as the reference electrode is proper or not; if real-time detection is adopted, the judgment procedure is carried out after the attenuation of the periodic wave variation of each time in the measurement cycle is compared. When the periodic wave variation attenuation comparison is performed on the obtained node signal, the difference value is firstly judged whether the first sensing electrode serving as the reference electrode is touched according to the set conditions of the sensing module, whether the following steps are executed to execute a selected reference electrode program is judged, and then other signal processing or judgment, such as point reporting, is performed.
Step S140: in the following step S130, when the first sensing electrode is determined to be abnormal, it is known that the driving electrode intersected with the first sensing electrode has at least one touched point. For example, as shown in the first embodiment of 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 two touched points on the first sensing electrode are D1S1 and D4S1 respectively.
Step S150: a selected reference electrode procedure is executed by the processing unit to replace the first sensing electrode to be the reference electrode. The processing unit executes the selected reference electrode program including steps S151 to S154.
Step S151: according to step S140, a node where the driving electrode on the touched point intersects with other sensing electrodes is found to be defined as a plurality of candidate nodes, wherein the sensing readings of the defined plurality of candidate nodes should conform to an ideal substrate 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 and D3S1, the nodes where the driving electrode is located and the other sensing electrodes meet are D1S2, D1S3, D1S4, and D3S 2-4, and it can be known whether the sensing readings of the nodes D1S2, D1S3, and D1S4 meet the condition definition of the ideal base value according to step S100, for example, when the sensing readings are respectively located within a range of a difference of plus or minus 10% of the ideal base value, the condition definition of the ideal base value is met, but the definition of the invention is not limited thereto; if the sensing readings of the nodes D1S2, D1S3, and D1S4 all match the ideal base value, the nodes are defined as candidate nodes.
In the second embodiment of fig. 2, it can be known that two touched points on the first sensing electrode are D1S1 and D4S1, respectively, and the candidate nodes where the driving electrode meets other sensing electrodes may be D1S2, D1S3, D1S4, D4S2, D4S3 and D4S4. According to the step S100, whether the sensing reading values of the nodes D1S2, D1S3, D1S4, D4S2, D4S3 and D4S4 meet the condition definition of the ideal substrate value or not is known to be respectively located in the range of the difference of plus or minus 10% of the ideal substrate value; if the sensing readings of the nodes D1S2, D1S3, D1S4, D4S2, D4S3, and D4S4 all match the ideal base value, the nodes are defined as candidate nodes.
Step S152: and judging whether the sensing reading value of the candidate node minus the sensing reading value of the touched point accords with a critical value or not, and defining the candidate node which accords with the critical value as a perfect node. That is, in this step, it is determined that the candidate node is not touched by any finger or foreign object according to the condition that the candidate node meets the threshold value. In the embodiment, the threshold may be preset by the sensing module or converted from the ideal base value in step S100, but the invention is not limited thereto. For example, if all of the candidate nodes D1S2, D1S3, and D1S4 in fig. 1 meet the threshold, they can be defined as a perfect node; the candidate nodes D1S2, D1S3, D1S4, D4S2, D4S3, and D4S4 of fig. 2 are defined as perfect nodes if all meet the threshold.
The steps S140-S152 may be performed by a register (register) of a central processing module (not shown) to speed up the determination and instruction cycles. The central processing module is electrically connected to the processing unit 110, wherein the central processing module includes a plurality of registers (registers), and the central processing module retains and uses the plurality of registers as a load for driving the electrode to be abnormal; in other words, each buffer corresponds to at least one driving electrode, and the buffer records the driving electrode with the touched point first. The unit of the buffer is n-bit vector, and the number of the buffers is related to the number of the driving electrodes. That is, when the first sensing electrode is abnormal, one of the driving electrodes where the first sensing electrode meets the first sensing electrode has a touched point, so the cpu retains the register corresponding to the driving electrode, and records the driving electrode having the touched point 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 values of the candidate node does not meet the threshold value, the bit record of the register corresponding to the driving electrode on the candidate node is 0; when the difference of the sensing reading values of the candidate nodes meets the critical value, the bit record of the buffer corresponding to the driving electrode on the candidate nodes is 1; in other words, the driving electrode with bit record 1 of the corresponding buffer has a perfect node, so that only the driving electrode with bit record 1 needs to be operated subsequently, thereby accelerating the processing instruction cycle.
Step S153: and selecting the sensing electrode closest to the first sensing electrode as the reference electrode according to the sensing electrode where the perfect node is positioned. For example, the sensing electrodes of the perfect nodes D1S2, D1S3, D1S4 in fig. 1 are S2, S3 and S4, respectively, and the sensing electrode closest to the original first sensing electrode S1 is S2; the sensing electrodes of the perfect nodes D1S2, D1S3, D1S4, D4S2, D4S3, D4S4 of fig. 2 are S2, S3 and S4, respectively, and the sensing electrode closest to the original first sensing electrode S1 is S2. Thus, in both embodiments of fig. 1 and 2, the sensing electrode S2 is selected as the reference electrode.
Step S154: the first sensing electrode is replaced according to the sensing electrode selected in step S153. In the present embodiment, the sensing read value signal of the node obtained by the previous cycle measurement through the first sensing electrode is used to overwrite the sensing read value of the old read with the sensing read value of the new read; or the old sensing readings can be discarded directly for non-use.
Step S160: continuing to step S130 or S154, if the first sensing electrode is not abnormal, or another sensing electrode is additionally selected as the reference electrode, performing the touch measurement. In this embodiment, the sensing electrode is used as a reference electrode, and in addition to electrically connecting to a reference electrode circuit, the touch measurement further includes: the rest of the sensing electrodes are electrically connected to a positive vector circuit, and touch measurement is performed to obtain a touch signal. The touch measurement step comprises: the reference electrode circuit will measure with the positive vector measurement circuit in sequence, and synchronously obtain a reverse signal and a forward signal respectively; and receiving the reverse signal and the forward signal through an analog-digital conversion circuit to obtain a touch signal through conversion, 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 identification device, wherein a judging program is periodically or real-timely executed in a general periodic wave difference comparison operation of the sensing method, and a disturbed section of a first reference electrode are read, distinguished and judged; the second reference electrode is used to read the original disturbed area, and the disturbed area is compensated by operation, so as to complement the disturbed area as the correct read value, and the correct read value can be obtained by the full FRAME (FRAME). Therefore, the noise interference of the reference electrode is rapidly solved, and the overall sensing accuracy is improved.
Claims (12)
1. A sensing method of a touch recognition device, wherein the touch recognition device comprises a plurality of sensing electrodes, a plurality of driving electrodes and a processing unit electrically connected with the plurality of driving electrodes and the plurality of sensing electrodes, the plurality of sensing electrodes and the plurality of driving electrodes intersect to form a plurality of nodes, the sensing method comprises:
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 measurement cycle through the processing unit to obtain sensing readings of the plurality of nodes;
judging whether the first sensing electrode is abnormal or not according to the plurality of sensing readings; and
when the first sensing electrode is abnormal and one of the plurality of driving electrodes intersected with the first sensing electrode has a touched point, executing a selected reference electrode program through the processing unit to replace the first sensing electrode;
wherein the processing unit executing the selected reference electrode procedure comprises:
finding out a plurality of nodes where the driving electrode on the touched point meets other sensing electrodes to define a plurality of candidate nodes, wherein the sensing reading values of the defined candidate nodes need to meet an ideal base value;
judging whether the sensing reading value of the candidate node is in accordance with a critical value after subtracting the sensing reading value of the touched point, and defining the candidate node in accordance with the critical value as a perfect node; and
and selecting the sensing electrode nearest to the first sensing electrode according to the sensing electrode where the perfect node is located so as to replace the first sensing electrode.
2. The sensing method of claim 1, wherein the step of determining whether the first sensing electrode is abnormal comprises:
calculating a difference value between the sensing read value of each node on the same driving electrode and the sensing read value of the node on the first sensing electrode;
comparing whether the difference value is higher or lower than a threshold value; and the number of the first and second groups,
if the difference value is higher or lower than the threshold value, the first sensing electrode is judged to be abnormal.
3. The sensing method of claim 1, wherein the measurement cycle performed with the first sensing electrode as a reference electrode is stopped when the first sensing electrode is determined to be abnormal.
4. The sensing method as claimed in claim 1, wherein before the measurement cycle, a substrate measurement is performed under an ideal environment without the pointing device contacting the touch recognition device to obtain sensing readings of all of the plurality of nodes, and the ideal substrate value is calculated.
5. The sensing method of claim 1, wherein the condition that the ideal substrate value is met is defined as being within plus or minus 10% of the ideal substrate value.
6. The sensing method as claimed in claim 1, further comprising providing a central processing module electrically connected to the processing unit, wherein the central processing module comprises a plurality of registers, and the central processing module uses the plurality of registers to record the driving electrodes with the touched point, wherein the unit of the plurality of registers is n-bit vector, and the number of the plurality of registers is related to the number of the plurality of driving electrodes, and when the difference of the sensing readings of the candidate nodes does not meet the threshold, the bit of the register is recorded as 1; when the difference of the sensing readings of the candidate nodes meets the threshold, the bit of the register is recorded as 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;
wherein the processing unit selects a first sensing electrode of the plurality of sensing electrodes and sets the first sensing electrode as a reference electrode; performing a measurement cycle through the processing unit to obtain sensing readings of the plurality of nodes; judging whether the first sensing electrode is abnormal or not according to the plurality of sensing readings;
and when the first sensing electrode is abnormal and one of the plurality of driving electrodes intersected with the first sensing electrode has a touched point, executing a selected reference electrode program through the processing unit to replace the first sensing electrode;
wherein the processing unit executing the selected reference electrode procedure comprises: finding out a plurality of nodes where the driving electrode on the touched point meets other sensing electrodes to define a plurality of candidate nodes, wherein the sensing reading values of the defined candidate nodes need to meet an ideal base value; judging whether the sensing reading value of the candidate node is in accordance with a critical value after subtracting the sensing reading value of the touched point, and defining the candidate node in accordance with the critical value as a perfect node; and selecting the sensing electrode nearest to the first sensing electrode according to the sensing electrode where the perfect node is located so as to replace the first sensing electrode.
8. The sensing module of claim 7, wherein the step of the processing unit determining whether the first sensing electrode is abnormal comprises:
the processing unit calculates the sensing reading value of each node on the same driving electrode and a difference value between the sensing reading value of each node on the same driving electrode and the sensing reading value of each node on the first sensing electrode;
the processing unit compares 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, the processing unit judges that the first sensing electrode is abnormal.
9. The sensing module of claim 7, wherein the processing unit stops the measurement cycle performed by the first sensing electrode as a reference electrode when the first sensing electrode is determined to be abnormal.
10. The sensor module of claim 7, wherein before the processing unit performs the measurement cycle, the processing unit performs a substrate measurement under an ideal environment where no pointing device contacts the touch recognition device to obtain the sensing readings of all of the plurality of nodes, and calculates the ideal substrate value.
11. The sensing module of claim 7, wherein the condition for meeting the ideal substrate value is defined as being within plus or minus 10% of the ideal substrate value.
12. The sensing module of claim 8, further comprising a CPU electrically connected to the processing unit, wherein the CPU comprises a plurality of registers, the CPU uses the plurality of registers to record the driving electrodes with the touched point, wherein the unit of the plurality of registers is n-bit vector, and the number of the plurality of registers is related to the number of the plurality of driving electrodes, when the difference of the sensing readings of the candidate nodes does not meet the threshold, the bit of the register is recorded as 1; when the difference of the sensing readings of the candidate nodes meets the threshold, the bit of the register is recorded as 0.
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| TW201317871A (en) * | 2011-10-27 | 2013-05-01 | Novatek Microelectronics Corp | Touch sensing method |
| TWI530856B (en) * | 2014-12-19 | 2016-04-21 | 創為精密材料股份有限公司 | Capacitive sensor device and capacitive sensor method |
| CN107015684A (en) * | 2015-11-13 | 2017-08-04 | 意象无限股份有限公司 | Sensing method and sensing circuit of touch panel |
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| KR101444548B1 (en) * | 2012-12-12 | 2014-09-24 | 삼성전기주식회사 | Method and apparatus for sensing touch input |
| KR102114488B1 (en) * | 2013-11-05 | 2020-05-25 | 엘지디스플레이 주식회사 | Touch sensing system and display device |
| TWI537807B (en) * | 2014-12-19 | 2016-06-11 | 創為精密材料股份有限公司 | Capacitive sensor device and capacitive sensor method |
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| TW201317871A (en) * | 2011-10-27 | 2013-05-01 | Novatek Microelectronics Corp | Touch sensing method |
| TWI530856B (en) * | 2014-12-19 | 2016-04-21 | 創為精密材料股份有限公司 | Capacitive sensor device and capacitive sensor method |
| CN107015684A (en) * | 2015-11-13 | 2017-08-04 | 意象无限股份有限公司 | Sensing method and sensing circuit of touch panel |
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