CN114594880B - Correction method and identification judgment method of mutual capacitance signal and electronic device - Google Patents
Correction method and identification judgment method of mutual capacitance signal and electronic device Download PDFInfo
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- CN114594880B CN114594880B CN202210500184.2A CN202210500184A CN114594880B CN 114594880 B CN114594880 B CN 114594880B CN 202210500184 A CN202210500184 A CN 202210500184A CN 114594880 B CN114594880 B CN 114594880B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- 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
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
- G06F3/04186—Touch location disambiguation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- 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
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
- G06F3/041662—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving using alternate mutual and self-capacitive scanning
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- 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
Abstract
The invention discloses a mutual capacitance signal correction method, a mutual capacitance signal identification and judgment method and an electronic device, wherein the mutual capacitance signal correction method comprises the following steps: obtaining a real touch area; and correcting the mutual capacitance signal by using self-capacitance signals of a transmitting channel and a receiving channel of the real touch area. According to the invention, the mutual capacitance signal is corrected by using the self-capacitance signals of the transmitting channel and the receiving channel of the real touch area, so that the problem that the equipment of the capacitance detection technology is easily mistakenly identified as two-finger or multi-finger touch when being touched by a single large area is solved, the probability that the large area touch is identified as the multi-finger can be effectively reduced, and the user experience effect is improved.
Description
Technical Field
The invention relates to the field of touch screens, in particular to a mutual capacitance signal correction method, a mutual capacitance signal identification and judgment method and an electronic device.
Background
The capacitive touch screen has the advantages of high sensitivity, good light transmission, multi-finger touch support and the like, and based on the advantages, the capacitive touch screen technology is widely applied to various devices such as smart phones and watches. With the continuous development of science and technology, people have higher and higher requirements on the experience of touch technology, and higher requirements on the performance of intelligent equipment in various use scenes are also provided.
Capacitive touch screen technology generally adopts two detection modes, namely self capacitance and mutual capacitance. The detection technology based on the self-capacitance is applied to the fields of intelligent watches, touch keys, low-end mobile phones and the like. The mutual capacitance-based detection technology is widely applied to the fields of smart phones, smart watches, tablet computers, notebook touch pads and the like. Some manufacturers also adopt a self-capacitance and mutual-capacitance interactive scanning mode, and realize the functions of water resistance, noise resistance and the like by combining the self-capacitance and the mutual-capacitance.
However, the existing mutual capacitance detection technology equipment generally has a problem that when the equipment is placed on a common insulated desktop without being connected with a charger (referred to as a suspension test in the industry), a single-finger operation is performed on a touch screen of the equipment by using a thumb or a finger with a large area, and the touch operation is often easily recognized as two fingers or more fingers by mistake, so that misoperation is caused, and user experience is influenced.
The main reason for the above situation is that when a large area contacts the surface of the touch screen, the mutual capacitance signal scanned by the detection chip has a hollow phenomenon, that is, the signal value of the center area touched by the finger is small, even negative signals occur, while the signal value of the peripheral area is large, and this signal characteristic is likely to be mistakenly recognized as multi-finger touch for the finger touch recognition algorithm, thereby affecting the user experience.
When a single large-area touch screen is touched, the signal value of the touched central area is the largest ideally, and the signal is smaller towards the touch edge, so that the finger touch recognition algorithm can well recognize that the touch is a single large finger touch (usually, when the intelligent device is held in the hand or a charger is connected, the mutual capacitance signal is ideal when the touch is touched in a large area).
Therefore, in order to obtain a relatively ideal mutual capacitance signal when a large area of touch is made in the floating test state, a new identification and determination method is required to be provided, so that the device has a better touch performance in the floating state, and a better user experience effect is obtained.
Disclosure of Invention
The invention aims to provide a mutual capacitance signal correction method, a mutual capacitance signal identification and judgment method and an electronic device, so as to solve the problem that equipment is easily identified to be two-finger or multi-finger touch by mistake when being touched by a single large area in a suspension state based on a mutual capacitance detection technology.
In order to solve the above technical problem, the present invention provides a mutual capacitance signal correction method, for a mutual capacitance touch screen, including the following steps:
obtaining a real touch area;
and correcting the mutual capacitance signal by using self-capacitance signals of a transmitting channel and a receiving channel of the real touch area.
Preferably, in the mutual capacitance signal correction method, the correction of the mutual capacitance signal by using the self-capacitance signal includes the following steps:
normalizing the self-capacitance signals of the transmitting channel and the receiving channel to obtain a self-capacitance signal array of the transmitting channel and a self-capacitance signal array of the receiving channel;
multiplying the self-capacitance signal array of the transmitting channel and the self-capacitance signal array of the receiving channel to obtain an M x N self-capacitance signal matrix;
setting a signal correction value, and multiplying each signal in the self-capacitance signal matrix of M x N by the correction value to obtain a corrected self-capacitance signal matrix;
and superposing the mutual capacitance signals of the real touch area to correct a self-capacitance signal matrix to obtain a corrected mutual capacitance signal matrix.
Preferably, in the mutual capacitance signal correction method, the correction value is set according to an actually adjusted touch signal magnitude of the mutual capacitance touch screen.
Preferably, in the mutual capacitance signal correction method, the setting of the correction value includes:
enabling mutual capacitance touch screen equipment to be in a non-suspension state, and scanning data of mutual capacitance;
providing a first touch signal, acquiring the size of the first touch signal in a touch area of a mutual capacitance touch screen, and recording the first touch signal;
enabling the mutual capacitance touch screen equipment to be in a suspension state, and scanning data of mutual capacitance;
providing a second touch signal, acquiring the size of the second touch signal in a touch area of the mutual capacitance touch screen, and recording the second touch signal;
and obtaining an average value A1 of the first touch signal and an average value A2 of the second touch signal, dividing the average value A1 of the first touch signal by the average value A2 of the second touch signal to obtain a proportional coefficient, and multiplying the proportional coefficient by the correction value of the self-capacitance signal to obtain a correction value for correcting the mutual capacitance.
Preferably, in the mutual capacitance signal correction method, the normalization processing step includes: and dividing each data in the self-capacitance signal array by the maximum value of the data, and multiplying the data by a positive integer to ensure that the normalized self-capacitance data is in a preset range.
Preferably, in the method for correcting a mutual capacitance signal, the step of obtaining a real touch area is as follows:
scanning all self-capacitance original data in a mutual capacitance touch screen with M transmitting channels and N receiving channels, and acquiring self-capacitance signal values of the M transmitting channels and self-capacitance signal values of the N receiving channels;
scanning mutual capacitance original data of intersection nodes of all transmitting channels and receiving channels on a mutual capacitance touch screen to obtain M × N mutual capacitance signal values;
finding out self-capacitance signals with the self-capacitance signal values larger than a certain threshold value, and screening out possible touch areas;
and finding out an area with the capacitance signal value larger than a certain threshold value in the possible touch area to obtain a real touch area.
Preferably, in the method for correcting the mutual capacitance signal, the method for screening the real touch area includes:
screening all continuous areas with the self-capacitance signal values of the M transmitting channels larger than a certain threshold value, and finding out all continuous areas with the self-capacitance signal values of the N receiving channels larger than the certain threshold value; screening out the intersection position of the self-capacitance touch area of the transmitting channel and the self-capacitance touch area of the receiving channel; and finding out areas in the possible touch areas, wherein the self-capacitance signal value and the mutual capacitance signal value are both larger than a certain threshold value, and obtaining a real touch area.
In another aspect of the present invention, a method for identifying and determining a finger touch area is further provided, where the method for correcting a mutual capacitance signal as described above is used, and the method further includes: and performing subsequent finger touch area identification and judgment by using the corrected mutual capacitance signal matrix.
In another aspect of the present invention, an electronic device is further provided, including:
a mutual capacitance touch screen;
one or more processors;
a memory; and
one or more programs stored in the memory and executed by the one or more processors; the program comprising instructions for carrying out any of the methods as described above.
Compared with the prior art, the invention at least has the following beneficial effects:
according to the invention, the mutual capacitance signals are corrected by using the self-capacitance signals of the transmitting channel and the receiving channel of the real touch area, so that the probability that large-area touch is recognized as multi-finger can be effectively reduced, and the user experience effect is improved. By adopting the method for correcting the mutual capacitance signal by self capacitance, the probability that large-area touch is identified as multi-finger is reduced, the problem of touch coordinate jitter caused by unstable suspension mutual capacitance signal can be reduced, and the method has a good effect on improving user experience.
Drawings
Fig. 1 is a schematic flow chart illustrating a mutual capacitance signal correction method according to an embodiment of the present invention;
fig. 2 is a schematic flowchart illustrating a method for correcting a mutual capacitance signal by using a self-capacitance signal according to a second embodiment of the present invention;
FIG. 3 is a flowchart illustrating a method for obtaining a real touch area according to a second embodiment of the present invention;
fig. 4 is a schematic structural diagram of screening of real touch areas in the second embodiment and the third embodiment of the present invention.
Detailed Description
The method for correcting a mutual capacitance signal, the method for identifying and determining, and the electronic device of the present invention will be described in more detail with reference to the schematic drawings, in which preferred embodiments of the present invention are shown, it should be understood that those skilled in the art can modify the present invention described herein while still achieving the advantageous effects of the present invention. Accordingly, the following description should be construed as broadly as possible to those skilled in the art and not as limiting the invention.
The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
Example one
As shown in fig. 1, in this embodiment, the present invention provides a method for correcting a mutual capacitance signal, where the method includes the following steps:
obtaining a real touch area;
the mutual capacitance signal is modified using the self-capacitance signals of the Transmit (TX) and Receive (RX) channels of the real touch area.
In the embodiment, the mutual capacitance signals are corrected by using the self-capacitance signals of the transmitting channel and the receiving channel of the real touch area, so that the probability that large-area touch is identified as multi-finger can be effectively reduced, and the user experience effect is improved.
Example two
As shown in fig. 2, the method for correcting a mutual capacitance signal by using a self-capacitance signal according to this embodiment includes the following steps:
normalizing the self-capacitance signals of the transmitting channel (TX) and the receiving channel (RX) to obtain a self-capacitance signal array of the transmitting channel and a self-capacitance signal array of the receiving channel;
multiplying the self-capacitance signal array of the transmitting channel and the self-capacitance signal array of the receiving channel to obtain an M x N self-capacitance signal matrix;
setting a signal correction value S, multiplying each signal in the self-capacitance signal matrix of M x N by the correction value S to obtain a corrected self-capacitance signal matrix;
and superposing the mutual capacitance signals of the real touch area to correct a self-capacitance signal matrix to obtain a corrected mutual capacitance signal matrix.
Wherein the normalization processing step comprises: and dividing each data in the self-capacitance signal array by the maximum value of the data, and multiplying the data by a positive integer to ensure that the normalized self-capacitance data is in a preset range.
Specifically, each datum in the self-capacitance signal array is divided by the maximum value of the datum, and then the datum is multiplied by a positive integer, such as 100, so that the normalized self-capacitance data can be ensured to be between 0 and 100.
And setting the correction value S according to the actually adjusted touch signal size of the mutual capacitance touch screen.
The setting of the correction value includes:
enabling mutual capacitance touch screen equipment to be in a non-suspension state, and scanning data of mutual capacitance;
providing a first touch signal, acquiring the size of the first touch signal in a touch area of a mutual capacitance touch screen, and recording the first touch signal;
enabling the mutual capacitance touch screen equipment to be in a suspension state, and scanning data of mutual capacitance;
providing a second touch signal, acquiring the size of the second touch signal in a touch area of the mutual capacitance touch screen, and recording the second touch signal;
and obtaining an average value A1 of the first touch signal and an average value A2 of the second touch signal, dividing the average value A1 of the first touch signal by the average value A2 of the second touch signal to obtain a proportional coefficient, and multiplying the proportional coefficient by the correction value of the self-capacitance signal to obtain a correction value for correcting the mutual capacitance.
Specifically, the mutual capacitance touch screen device is connected with a charger (in a non-suspension state) to scan mutual capacitance data; placing a 30mm large copper bar on the surface of a mutual capacitance touch screen, obtaining the size of a touch signal of a copper bar touch area through a debugging tool, and recording the signal to S1[ 1-n ];
then disconnecting the charger of the equipment, placing the equipment on an insulating desktop to enable the equipment to be in a suspended state, placing a 30mm large copper bar on the surface of the screen again, obtaining the size of a touch signal of a copper bar touch area through a debugging tool, and recording the signal of the touch signal in S2[ 1-n ]; obtaining an average value A1 of S1[ 1-n ], obtaining an average value A2 of S2[ 1-n ], obtaining a proportionality coefficient K1 from A1/A2, multiplying the K1 by a correction value of the self-capacitance signal to obtain a correction signal for correcting mutual capacitance, and superposing the group of correction signals on the mutual capacitance signal.
As shown in fig. 3, in this embodiment, taking a mutual capacitance touch screen with M TX and N RX as an example, the method for obtaining the real touch area includes the following steps:
scanning all self-capacitance original data in a mutual capacitance touch screen with M transmitting channels and N receiving channels, and acquiring self-capacitance signal values of the M transmitting channels and self-capacitance signal values of the N receiving channels;
scanning mutual capacitance original data of intersection nodes of all transmitting channels and receiving channels on a mutual capacitance touch screen to obtain M × N mutual capacitance signal values;
finding out self-capacitance signals with the self-capacitance signal values larger than a certain threshold value, and screening out possible touch areas;
and finding out an area with the capacitance signal value larger than a certain threshold value in the possible touch area to obtain a real touch area.
The method for screening out the real touch area according to the possible touch area comprises the following steps:
screening all self-capacitance signal values of M transmitting channels (TX) which are larger than a certain threshold value and continuous areas T1-Tu, and finding all self-capacitance signal values of N receiving channels (RX) which are larger than a certain threshold value and continuous areas R1-Rv, wherein the found areas indicate that touch possibly exists; screening out the intersection positions of the self-capacitance touch areas of the transmitting channels and the self-capacitance touch areas of the receiving channels, namely finding out the intersection positions of all TX self-capacitance touch areas and RX self-capacitance touch areas, namely T1R1, T1R2.. T1 Rv-TuR 1, TuR2 and TuRv; and finding out areas in the possible touch areas, wherein the self-capacitance signal value and the mutual capacitance signal value are both larger than a certain threshold value, and obtaining a real touch area.
Specifically, as shown in fig. 4, for example, if two fingers touch the T1R1 and T2R2 areas on the touch screen, respectively, then the T1 area and the T2 area can be found out to be touched from the TX self-capacitance signal, and the R1 area and the R2 area can be found out to be touched from the RX self-capacitance signal, then the intersection area of the TX self-capacitance touch area and the RX self-capacitance touch area is: T1R1, T1R2, T2R1, T2R 2.
And selecting a real touch area by using the possible touch area found by the self-capacitance signal and combining the M-N mutual capacitance signals.
In this embodiment, the standard for finding out the real touch area is as follows: both the self-capacitance signal and the self-capacitance signal of the area have signals greater than the touch threshold.
Preferably, referring to fig. 4, the intersection areas with touch found according to the TX self-capacitance signal and the RX self-capacitance signal are T1R1, T1R2, T2R1 and T2R2, and the areas with touch found according to the mutual capacitance signal are T1R1 and T2R 2. Then the true touch areas are T1R1 and T2R2, i.e., both the self capacitance signal and the mutual capacitance signal need to be satisfied as being greater than the corresponding touch thresholds.
In the method for correcting the mutual capacitance signal by using the self-capacitance signal provided by the embodiment, the self-capacitance signal is used for correcting the mutual capacitance signal, so that the probability that a single large-area touch is recognized as a multi-finger when the device using the mutual capacitance screen is in a suspension state can be effectively reduced; in addition, the method provided by the embodiment can also reduce the problem of touch coordinate jitter caused by unstable floating mutual capacitance signals, so that the method has a good effect on improving the user experience of the equipment.
EXAMPLE III
In this embodiment, a method for identifying and determining a finger touch area is provided, where the method for correcting a mutual capacitance signal according to any one of the first embodiment and the second embodiment is used, and the method further includes: and performing subsequent finger touch area identification and judgment by using the corrected mutual capacitance signal matrix.
Specifically, for all real touch areas found in the first embodiment or the second embodiment, the TX self-capacitance signal and the RX self-capacitance signal of the corresponding areas are used to correct the mutual capacitance signal in the areas.
Referring to fig. 4, in the present embodiment, still taking the touch in the second embodiment as an example, since there are two real touch regions, i.e., T1R1 and T2R2, the mutual capacitance signal of the region T1R1 needs to be corrected by the TX self-capacitance signal T1 and the RX self-capacitance signal R1, and the mutual capacitance signal of the region T2R2 needs to be corrected by the TX self-capacitance signal T2 and the RX self-capacitance signal R2.
For a specific modification method, please refer to embodiment two, which is not described herein.
And performing subsequent finger touch area identification and judgment by using the corrected mutual capacitance signal matrix.
Example four
In this embodiment, an electronic apparatus is provided, including:
a mutual capacitance touch screen;
one or more processors;
a memory; and
one or more programs stored in the memory and executed by the one or more processors, the programs including instructions for performing the method of any of embodiments one, two, or three.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. A mutual capacitance signal correction method is used for a mutual capacitance touch screen, and is characterized by comprising the following steps:
obtaining a real touch area;
correcting the mutual capacitance signal by using self-capacitance signals of a transmitting channel and a receiving channel of the real touch area;
the method for correcting the mutual capacitance signal by using the self-capacitance signal comprises the following steps:
normalizing the self-capacitance signals of the transmitting channel and the receiving channel to obtain a self-capacitance signal array of the transmitting channel and a self-capacitance signal array of the receiving channel;
multiplying the self-capacitance signal array of the transmitting channel and the self-capacitance signal array of the receiving channel to obtain an M x N self-capacitance signal matrix;
setting a signal correction value, and multiplying each signal in the self-capacitance signal matrix of M x N by the correction value to obtain a corrected self-capacitance signal matrix;
superposing the mutual capacitance signals of the real touch area to correct a self-capacitance signal matrix to obtain a corrected mutual capacitance signal matrix;
and the correction value is set according to the actually adjusted touch signal size of the mutual capacitance touch screen.
2. The mutual capacitance signal correction method as claimed in claim 1, wherein the setting of the correction value comprises:
enabling mutual capacitance touch screen equipment to be in a non-suspension state, and scanning data of mutual capacitance;
providing a first touch signal, acquiring the size of the first touch signal in a touch area of a mutual capacitance touch screen, and recording the first touch signal;
enabling the mutual capacitance touch screen equipment to be in a suspension state, and scanning data of mutual capacitance;
providing a second touch signal, acquiring the size of the second touch signal in a touch area of the mutual capacitance touch screen, and recording the second touch signal;
and obtaining an average value A1 of the first touch signal and an average value A2 of the second touch signal, dividing the average value A1 of the first touch signal by the average value A2 of the second touch signal to obtain a proportional coefficient, and multiplying the proportional coefficient by the correction value of the self-capacitance signal to obtain a correction value for correcting the mutual capacitance.
3. The mutual capacitance signal correction method as claimed in claim 1, wherein the normalization processing step includes: and dividing each data in the self-capacitance signal array by the maximum value of the data, and multiplying the data by a positive integer to ensure that the normalized self-capacitance data is in a preset range.
4. The mutual capacitance signal correction method as claimed in claim 1, wherein the real touch area obtaining step is as follows:
scanning all self-capacitance original data in a mutual capacitance touch screen with M transmitting channels and N receiving channels, and acquiring self-capacitance signal values of the M transmitting channels and self-capacitance signal values of the N receiving channels;
scanning mutual capacitance original data of intersection nodes of all transmitting channels and receiving channels on a mutual capacitance touch screen to obtain M × N mutual capacitance signal values;
finding out self-capacitance signals with the self-capacitance signal values larger than a certain threshold value, and screening out possible touch areas;
and finding out an area with the capacitance signal value larger than a certain threshold value in the possible touch area to obtain a real touch area.
5. The mutual capacitance signal correction method according to claim 4, wherein the real touch area is screened by:
screening all continuous areas with the self-capacitance signal values of the M transmitting channels larger than a certain threshold value, and finding out all continuous areas with the self-capacitance signal values of the N receiving channels larger than the certain threshold value; screening out the intersection position of the self-capacitance touch area of the transmitting channel and the self-capacitance touch area of the receiving channel; and finding out areas in the possible touch areas, wherein the self-capacitance signal value and the mutual capacitance signal value are both larger than a certain threshold value, and obtaining a real touch area.
6. A method for identifying and determining a finger touch area, using the mutual capacitance signal correction method according to any one of claims 1 to 5, further comprising the steps of: and performing subsequent finger touch area identification and judgment by using the corrected mutual capacitance signal matrix.
7. An electronic device, comprising:
a mutual capacitance touch screen;
one or more processors;
a memory; and
one or more programs stored in the memory and executed by the one or more processors; the program comprising instructions for performing the method of any one of claims 1-5.
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| CN102968235B (en) * | 2012-11-27 | 2015-12-02 | 深圳市汇顶科技股份有限公司 | The touch detecting method of touch sensor, system and touch control terminal |
| TWI492134B (en) * | 2013-01-24 | 2015-07-11 | Orise Technology Co Ltd | Sensing method for using self-capacitance and mutual-capacitance alternatively to reduce touch noise |
| US10775927B2 (en) * | 2017-08-14 | 2020-09-15 | Stmicroelectronics Asia Pacific Pte Ltd | Calculation of touch coordinates using mixed processing of mutual capacitance sensing data and self capacitance sensing data |
| CN110134295B (en) * | 2018-02-09 | 2022-09-20 | 鹤壁天海电子信息系统有限公司 | Terminal device, capacitive touch screen and touch identification method thereof |
| CN111708457B (en) * | 2020-06-17 | 2023-11-10 | 北京集创北方科技股份有限公司 | Self-capacitance data processing method and device |
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