CN108958543A - A kind of array sweeping method that self-capacitance touch screen signal-to-noise ratio can be improved - Google Patents
A kind of array sweeping method that self-capacitance touch screen signal-to-noise ratio can be improved Download PDFInfo
- Publication number
- CN108958543A CN108958543A CN201810693491.0A CN201810693491A CN108958543A CN 108958543 A CN108958543 A CN 108958543A CN 201810693491 A CN201810693491 A CN 201810693491A CN 108958543 A CN108958543 A CN 108958543A
- Authority
- CN
- China
- Prior art keywords
- electrode
- touch screen
- self
- group
- induction electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- G06F3/0412—Digitisers structurally integrated in a display
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Input By Displaying (AREA)
Abstract
The invention belongs to touch screen technology fields, provide a kind of array sweeping method that self-capacitance touch screen signal-to-noise ratio can be improved.Described method includes following steps: step 1, and the N on self-capacitance touch screen is divided into M group to left and right complementary induction electrode, every group of K to left and right electrode, wherein N >=3, M >=1, K >=3；Step 2 chooses that wherein K-1 is left and right to electrode point to connect together while being scanned for every group of electrode every time, and every group of electrode can scan K times, obtain K to data, all groupings, which amount to, can be obtained N to scan data；Step 3, for the N obtained according to step 2 to scan data, N is calculated to the actual signal of each self-scanning of left and right electrode in chip program by the way of solving algebraic equation.Self-capacitance touch screen array sweeping mode of the present invention can be effectively reduced the noise in scan data, improve signal strength, and then effectively improve signal-to-noise ratio, enhance the anti-interference ability of system.
Description
Technical field
The invention belongs to touch screen technology fields, and self-capacitance touch screen signal-to-noise ratio can be improved more specifically to one kind
Array sweeping method.
Background technique
In current capacitance-type touch screen technology in human-computer interaction class consumer electronics sector using more and more extensive, according to
Capacitive touch screen can be divided into mutual capacitance touchscreens and self-capacitance touch screen, mutually by the difference of measurement method and implementation
Capacitance touch screen is mainly used in the case where can supporting multifingered manipulation, and self-capacitance touch screen, which is then mainly used in, singly to be referred to or two refer to
The case where operation.Since self-capacitance touch screen has, cost of manufacture relatively low advantage simpler than mutual capacitance touchscreens structure,
Thus it is also widely applied in touch-control field.Self-capacitance touch screen scanning survey is to shield upper induction electrode relatively
Capacitance, when the surface of the finger touch screen of people, finger is equivalent to ground, therefore the self-capacitance value measured will increase, according to this change
Change, finger touch position can be calculated in touch chip.The measurement of self-capacitance noise very sensitive to the variation of environment, extraneous
Interference can seriously affect the measurement of touch signal, and then influence to calculate the precision of touch location.The prior art is certainly electric in scanning
When holding touch screen, typically a line a line is scanned, and the sensing area of every a line is relatively small, for those chargers and LCD
The more severe situation of noise, the tiny signal that finger touches may be by these noise severe jammings, it is difficult to accurately sense
To finger touch position, the user experience effect of product is finally seriously affected.
Summary of the invention
In order in the case where not increasing hardware cost, promote the signal-to-noise ratio of self-capacitance touch screen, its anti-interference energy is improved
Power, the present invention provides a kind of array sweeping methods that self-capacitance touch screen signal-to-noise ratio can be improved.
The method of the invention is as follows:
Step 1, by comprising N to the electrode on the self-capacitance touch screen of left and right complementary induction electrode to be divided into M group to as unit of,
Every group of K is to electrode；
Step 2, entire touch screen are divided into after M group, for any one group of induction electrode, with K to induction electrode, every time
It therefrom chooses K-1 to be scanned electrode, scanning mode of this K-1 to electrode are as follows: K-1, left side induction electrode is connected to touch-control
K-1 measurement pin of chip, touch chip are linked together its whole by process control, the K-1 induced electricity on the right
Pole is obtained left and right in this way, touch chip to the left and right induction electrode to connect together respectively while being scanned this K-1
Each scan data, by permutation and combination knowledge it is found that having K kind to the selection of induction electrode to selection K-1 in induction electrode from K
Mode, therefore any one group of induction electrode i can obtain K to scan data, and all Grouping scans finally obtain N pairs after the completion
Scan data；
Step 3, according to the N of step 2 scanning to data, touch chip program is by the way of solving algebraic equation by N to left and right
The actual signal of electrode scanning calculates.For any one group of electrode, by taking the induction electrode on certain one side as an example, it includes K
Induction electrode, corresponding K scan data is respectively V1、V2To VK, corresponding K induction electrode actual signal to be solved point
It Wei not S1、S2To SK, calculating process is as follows:
There are following relationships with actual signal S to be solved by scan data V:
S1 + S2 +S3 + …+SK-2 + SK-1 = VK
S1 + S2 +S3 + …+SK-2 + SK = VK-1
S1 + S3 +S4 + …+SK-1 + SK = V2
S2 + S3 +S4 + …+SK-1 + SK = V1
Solution above equation group can obtain the actual signal S of each induction electrodej:
Sj = - Vj
Wherein, i, j, K be integer, K >=3,1≤i≤K, 1≤j≤K.
The invention has the benefit that
1) self-capacitance touch screen multiple electrodes are connected together while is scanned, the induction region at scanning moment can be increased, thus
The finger touch signal intensity sensed can be improved；
2) since multiple electrodes connect together while scanning, common-mode noise having the same in each electrode scan signal, this is to rear
Phase is considered by way of common mode filtering except noise is helpful；
3) it since multiple electrodes connect together while scanning, makes an uproar for some random noises and due to caused by Electric Manufacture error
Sound, the scanning mode have the effect of cancelling out each other；
4) actual signal of each electrode solves calculating process and is apparent clear, not complicated operation；
5) this method be change self-capacitance touch screen scanning mode, changed without from hardware, do not increase it is any at
The signal-to-noise ratio of self-capacitance touch screen is effectively improved in the case where this, to improve the user experience of touch-control product.
Detailed description of the invention
Fig. 1 is a kind of array sweeping method flow signal that self-capacitance touch screen signal-to-noise ratio can be improved disclosed by the invention
Figure.
Fig. 2 is that a kind of self-capacitance touch screen disclosed by the embodiments of the present invention is grouped schematic diagram.
Fig. 3 is a kind of self-capacitance touch screen scanning circuit schematic diagram disclosed by the embodiments of the present invention.
Specific embodiment
In order to which the method for the invention is more clearly understood, the present invention is done further with reference to the accompanying drawings and embodiments
It is described in detail.It should be appreciated that specific embodiment described herein is served only for explaining the present invention, and do not limit the present invention.
The present embodiment is illustrated by taking the smartwatch touch screen comprising 5 pairs of induction electrodes as an example, with reference to Fig. 1, the present invention
A kind of array sweeping method that self-capacitance touch screen signal-to-noise ratio can be improved that embodiment provides, key step are as follows:
All induction electrodes of self-capacitance touch screen are grouped by step 1.Since the self-capacitance touch screen of the embodiment only has 5
To electrode, number of electrodes is relatively fewer, therefore this 5 pairs of electrodes to be divided into 1 group convenient for calculating；
Step 2 is scanned the induction electrode of each grouping by the way of array sweeping, obtains scan data.With reference to Fig. 2,
The present embodiment only has 1 group of 5 pairs of induction electrode in total, therefore following scanning mode can be taken to be scanned:
Touch chip is connected together ch1, ch2, ch3, ch4 by process control, and ch10, ch9, ch8, ch7 are connected together,
It is scanned simultaneously, obtains left and right each scan data VL5And VR5；
Touch chip is connected together ch1, ch2, ch3, ch5 by process control, and ch10, ch9, ch8, ch6 are connected together,
It is scanned simultaneously, obtains left and right each scan data VL4And VR4；
Touch chip is connected together ch1, ch2, ch4, ch5 by process control, and ch10, ch9, ch7, ch6 are connected together,
It is scanned simultaneously, obtains left and right each scan data VL3And VR3；
Touch chip is connected together ch1, ch3, ch4, ch5 by process control, and ch10, ch8, ch7, ch6 are connected together,
It is scanned simultaneously, obtains left and right each scan data VL2And VR2；
Touch chip is connected together ch2, ch3, ch4, ch5 by process control, and ch9, ch8, ch7, ch6 are connected together,
It is scanned simultaneously, obtains left and right each scan data VL1And VR1；
To the reference circuit that each electrode scans above as shown in figure 3, it mainly includes two stages:
Stage one: the S2 of circuit being switched and is disconnected, and S1 switch connection, will be tested electrode Cs at this time will be reset to GND；
Stage two: the S1 of circuit being switched and is disconnected, and S2 switch connection, constant-current source IDAC will charge to Cs at this time, until
The output end of integrator reaches VRef voltage, so that comparator is overturn, counter then to entire charging until the process of overturning into
Row counts, one scan values of final output；
Step 3 passes through according to scan data and solves equation the actual signal that each induction electrode is calculated.If each induction electrode in the left side
Actual signal be followed successively by SL1、SL2、SL3、SL4、SL5If the actual signal of each induction electrode in the right is followed successively by SR1、SR2、SR3、
SR4、SR5, then there are following relationships for the obtained signal of the actual signal of each induction electrode and array sweeping:
The induction electrode on the left side: the induction electrode on the right:
SL1 + SL2 + SL3 + SL4 = VL5 SR1+ SR2 + SR3 + SR4 = VR5
SL1 + SL2 + SL3 + SL5 = VL4 SR1+ SR2 + SR3 + SR5 = VR4
SL1 + SL2 + SL4 + SL5 = VL3 SR1 + SR2 + SR4 + SR5 = VR3
SL1 + SL3 + SL4 + SL5 = VL2 SR1 + SR3 + SR4 + SR5 = VR2
SL2 + SL3 + SL4 + SL5 = VL1 SR2 + SR3 + SR4 + SR5 = VR1
Solution above equation group can obtain the actual signal S of left and right each induction electrodeLiAnd SRi:
SLi = (VL1+ VL2+ VL3+ VL4+ VL5)/4 - VLi(1≤i≤5)
SRi = (VR1+ VR2+ VR3+ VR4+ VR5)/4 - VRi(1≤i≤5)
The present invention is creatively scanned self-capacitance touch screen by the way of array sweeping, strong to improve its signal
Degree, reduces the influence of ambient noise, to reach raising signal-to-noise ratio, promotes the purpose of product user experience.
Embodiment provided by the invention is a kind of explanatory embodiment, is not used to limit the application.For ability
For the technical staff in domain, various changes and changes are possible in this application.Within the spirit and principles of this application, it is done
Any modification, replacement, improvement etc., should be included within the scope of protection of this application.
Claims (5)
1. a kind of array sweeping method that self-capacitance touch screen signal-to-noise ratio can be improved, which comprises the steps of: the 1st
N on self-capacitance touch screen is divided into M group to left and right complementary induction electrode by step, every group of K to left and right electrode, wherein N >=3, M >
=1, K >=3；Step 2 chooses that wherein K-1 is left and right to electrode point to connect together while being scanned for every group of electrode every time,
Every group of electrode can scan K times, obtain K to data, N can be obtained to scan data in all grouping totals；Step 3 is obtained according to step 2
For the N arrived to scan data, N is calculated to each self-scanning of left and right electrode in chip program by the way of solving algebraic equation
Actual signal.
2. a kind of array sweeping method that self-capacitance touch screen signal-to-noise ratio can be improved according to claim 1, feature exist
In the electrode packet mode in the method step 1 does not have particular/special requirement, can be divided into M group, can also be according to other sides
Formula is grouped, and every group must be more than or equal to 3 pairs of electrodes.
3. a kind of array sweeping method that self-capacitance touch screen signal-to-noise ratio can be improved according to claim 1, feature exist
In specific step is as follows for the step 2: after entire touch screen is divided into M group, for any one group of induction electrode, tool
There is K to induction electrode, therefrom chooses K-1 every time and electrode is scanned, scanning mode of this K-1 to electrode are as follows: left side K-1
Induction electrode is connected to K-1 measurement pin of chip, and chip interior is linked together its whole by process control, the right
K-1 induction electrode be also in this way, chip to the left and right induction electrode to connect together respectively while being scanned this K-1,
Left and right each scan data is obtained, by permutation and combination knowledge it is found that from K to selection K-1 in induction electrode to induction electrode
Selection has a K kind mode, therefore any one group of induction electrode i, can obtain K to scan data, after the completion of all Grouping scans most
N is obtained eventually to scan data.
4. a kind of array sweeping method that self-capacitance touch screen signal-to-noise ratio can be improved according to claim 3, feature exist
In, the chip to the left and right induction electrode to connect together respectively while being scanned this K-1, scanning process mainly by
Two stage compositions: all induction electrodes to connect together are grounded, it are allowed to be reset to original state by the first stage；Second-order
Section disconnects the connection of induction electrode and ground, is charged by a constant-current source to tested induction electrode, until comparison circuit turns over
Turn to stop charging, counter can count entire charging process, obtain one-shot measurement data；The scanning process can repeat
Repeatedly, count value will increase tired increasing with scanning times.
5. a kind of array sweeping method that self-capacitance touch screen signal-to-noise ratio can be improved according to claim 1, feature exist
In the step 3 chip program is calculated the N actual signal scanned to left and right electrode by the way of solving algebraic equation
Come, for any one group of electrode, by taking the induction electrode on the left side as an example, it includes the induction electrode on the K left side, corresponding K are swept
Retouching data is respectively V1、V2To VK, corresponding K induction electrode actual signal to be solved is respectively S1、S2To SK, calculated
Journey is as follows:
There are following relationships with actual signal S to be solved by scan data V:
S1 + S2 +S3 + …+SK-2 + SK-1 = VK
S1 + S2 +S3 + …+SK-2 + SK = VK-1
.
.
.
S1 + S3 +S4 + …+SK-1 + SK= V2
S2 + S3 +S4 + …+SK-1 + SK= V1
Solution above equation group can obtain the actual signal S of each induction electrodej:
Sj =-Vj
Wherein, i, j, K be integer, K >=3,1≤i≤K, 1≤j≤K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810693491.0A CN108958543A (en) | 2018-06-29 | 2018-06-29 | A kind of array sweeping method that self-capacitance touch screen signal-to-noise ratio can be improved |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810693491.0A CN108958543A (en) | 2018-06-29 | 2018-06-29 | A kind of array sweeping method that self-capacitance touch screen signal-to-noise ratio can be improved |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108958543A true CN108958543A (en) | 2018-12-07 |
Family
ID=64487789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810693491.0A Pending CN108958543A (en) | 2018-06-29 | 2018-06-29 | A kind of array sweeping method that self-capacitance touch screen signal-to-noise ratio can be improved |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108958543A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103902127A (en) * | 2014-04-09 | 2014-07-02 | 泰凌微电子（上海）有限公司 | Capacitive touch screen and touch position locating method thereof |
| CN105022539A (en) * | 2014-04-28 | 2015-11-04 | 乐金显示有限公司 | Display device |
| CN105760026A (en) * | 2014-09-26 | 2016-07-13 | 义隆电子股份有限公司 | scanning method and device of single-layer capacitive touch panel |
| CN105912179A (en) * | 2016-04-22 | 2016-08-31 | 苏州椒图电子有限公司 | Drive scanning method for capacitive sensing apparatus |
| CN106990880A (en) * | 2015-11-19 | 2017-07-28 | 辛纳普蒂克斯公司 | Method and apparatus for improving capacitive sensing detection |
-
2018
- 2018-06-29 CN CN201810693491.0A patent/CN108958543A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103902127A (en) * | 2014-04-09 | 2014-07-02 | 泰凌微电子（上海）有限公司 | Capacitive touch screen and touch position locating method thereof |
| CN105022539A (en) * | 2014-04-28 | 2015-11-04 | 乐金显示有限公司 | Display device |
| CN105760026A (en) * | 2014-09-26 | 2016-07-13 | 义隆电子股份有限公司 | scanning method and device of single-layer capacitive touch panel |
| CN106990880A (en) * | 2015-11-19 | 2017-07-28 | 辛纳普蒂克斯公司 | Method and apparatus for improving capacitive sensing detection |
| CN105912179A (en) * | 2016-04-22 | 2016-08-31 | 苏州椒图电子有限公司 | Drive scanning method for capacitive sensing apparatus |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8093914B2 (en) | Compensation circuit for a TX-RX capacitive sensor | |
| US10628651B2 (en) | Capacitive fingerprint sensor | |
| US8797049B2 (en) | Low power capacitive touch detector | |
| CN105138986A (en) | Fingerprint detection circuit, fingerprint detection device and touch panel | |
| US20190196654A1 (en) | Differential circuit, capacitance detection circuit, touch detection device and terminal device | |
| US10790822B2 (en) | Switching arrangement and method for a capacitive sensor | |
| WO2020047844A1 (en) | Capacitance detection circuit, touch chip and electronic device | |
| US20110068810A1 (en) | Sensing method and driving circuit of capacitive touch screen | |
| US9092100B2 (en) | Multitouch touch-sensitive device with multifrequency capacitive detection | |
| CN106716839A (en) | Analog elimination of ungrounded conductive objects in capacitive sensing | |
| CN102362186A (en) | Multi-functional capacitance sensing circuit with a current conveyor | |
| CN103713784A (en) | Capacitive touch detecting circuit, device and identification method capable of preventing mistakes caused by stains | |
| US11650696B2 (en) | Noise detection circuit, self-capacitance detection method, touch chip, and electronic device | |
| CN102193032A (en) | Self-capacitance change measuring circuit with high precision and high stability | |
| CN100566164C (en) | A kind of high precision capacitance touching induction control circuit framework | |
| US20160162075A1 (en) | Electronic device with touch control circuit powered by dedicated power source | |
| CN114487784A (en) | Capacitance detection circuit, touch chip and electronic equipment | |
| CN102253289B (en) | Electric capacity measuring device for touch control device | |
| CN103823598A (en) | Touch sensing circuit and method | |
| TWI444877B (en) | Capacitive touching apparatus | |
| CN104767512A (en) | Capacitive touch button signal measuring device and measuring method thereof | |
| CN108958543A (en) | A kind of array sweeping method that self-capacitance touch screen signal-to-noise ratio can be improved | |
| US12028062B2 (en) | Touch or proximity sensing system and method | |
| CN217085101U (en) | Capacitance detection circuit, touch control chip and electronic equipment | |
| KR20210012132A (en) | High sensitivity touch sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: Room 411, 4th floor, main building, No. 835 and 937, Dangui Road, China (Shanghai) pilot Free Trade Zone, Pudong New Area, Shanghai, 200131 Applicant after: Shanghai hailichuang Technology Co.,Ltd. Address before: Room 411, 4 / F, main building (1 building), Zhangjiang guochuang center, 899 Dangui Road, Pudong New Area, Shanghai 201210 Applicant before: SHANGHAI HYNITRON MICROELECTRONIC Co.,Ltd. |
|
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181207 |