CN104516569B - Touch device, multi-point touch detection method thereof and coordinate calculation method thereof - Google Patents
Touch device, multi-point touch detection method thereof and coordinate calculation method thereof Download PDFInfo
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- CN104516569B CN104516569B CN201310499964.0A CN201310499964A CN104516569B CN 104516569 B CN104516569 B CN 104516569B CN 201310499964 A CN201310499964 A CN 201310499964A CN 104516569 B CN104516569 B CN 104516569B
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- 238000004364 calculation method Methods 0.000 title claims abstract description 20
- 238000001514 detection method Methods 0.000 title abstract description 6
- 230000006698 induction Effects 0.000 claims abstract description 103
- 238000000034 method Methods 0.000 claims abstract description 15
- 230000004069 differentiation Effects 0.000 description 4
- 241001269238 Data Species 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
-
- 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 relates to a touch device, a multi-point touch detection method and a coordinate calculation method thereof, wherein the detection method comprises the following steps: the method comprises the steps of scanning a sensing line to obtain analog data, converting the analog data into digital data, carrying out differential calculation on the digital data to obtain differential data, judging at least one touch point corresponding to the sensing line according to a threshold value and the differential data, and calculating coordinate values of the touch points according to the digital data corresponding to the touch points. The invention judges the number of fingers and/or calculates the coordinates by the difference mode among a plurality of induction points so as to improve the tolerance to noise and further improve the calculation precision of the coordinates of the touch points.
Description
Technical field
The present invention be on a kind of touch technology, especially with regard to a kind of contactor control device with multi-point touch function, its
The method for detecting and its Coordinate calculation method of multi-point touch.
Background technology
Contact panel is common a kind of user interface in current electronic product.More typical touch technology includes resistance
Formula, condenser type and optical profile type etc..Wherein, capacitance type touch-control panel has high-accuracy, multi-point touch, high durability and height
The features such as touch-control resolution ratio.
It is first, fixed to scan electric capacity biographies whole on contact panel within a cycle in well known touch detection method
Sensor simultaneously records its capacitance.Then, within a scheduled time, the capacitance of each point is compared with a critical value.Also, work as
Capacitance is continued above critical value in the given time, then judges there is an effective single-point touch.Conversely, not having among capacitance
There is any capacitance to be continued above critical value, then judge effective single-point touch is not present.However, on multi-point touch, with hardware
Angle for, hardware is successively to detect the touchings of two fingers, can so cause hardware to perform the instruction of mistake.For example,
When the touching that hardware detection to first refers to, corresponding touch command is immediately performed, but actually user is but intended to perform
Multi-point touch.Therefore, the method for detecting of multi-point touch is developed therewith, to avoid multi-point touch erroneous judgement as single-point touch,
Cause misoperation.
The method for detecting of multi-point touch is with shaft staggered formula known to a kind of（Axis intersect）Technology realizes that it is
The number of finger is judged to detect Wave crest and wave trough and with barycenter formula coordinates computed.In touch detection, controller meeting is sensed
Horizontal scan axle and vertical axis, and by the capacitance variation of each axle via analog-digital converter respectively（ADC）Be converted to number
Judged again after word signal.In this, the crest of rising occurs in the horizontally or vertically induction point for producing capacitively coupled
（peak）, and the confluce of this two axle is to be judged as effective touch point.Judge after touch point, then correspondence is calculated with barycenter formula
Coordinate value.However, because the output valve of analog-digital converter is subject to the pollution of noise, thus cause the touch-control that calculates
The coordinate of point is incorrect.
The content of the invention
It is a primary object of the present invention to provide a kind of method for detecting of multi-point touch, turn for solving current simulation numeral
The output valve of parallel operation is subject to the pollution of noise, causes the incorrect problem of coordinate of touch point calculated.
Another main purpose of the present invention is to provide a kind of Coordinate calculation method, for according between multiple induction points
Difference value calculates the coordinate of touch point.
The present invention another main purpose be to provide a kind of contactor control device, the device has multi-point touch function, can use
In the above-mentioned method for detecting of execution and Coordinate calculation method.
In one embodiment, a kind of method for detecting of multi-point touch includes：Scan a line of induction with obtain an analogue data,
By analogue data be converted into numerical data, to numerical data carry out differential calculation with obtain a differentiated data, according to a threshold values with
And differentiated data judges that at least touch point and the numerical data according to corresponding to each touch point of the correspondence line of induction are calculated and touched
Control the coordinate value of point.
In one embodiment, a kind of Coordinate calculation method includes：A line of induction is scanned to obtain an analogue data, will simulate
Data conversion carries out differential calculation into numerical data, to numerical data to obtain a differentiated data, according to a threshold values and differential
Data judge an at least touch point for the correspondence line of induction and multiple induction points for being closed on according to each touch point between difference
Value calculates the coordinate value of touch point.Wherein, the coordinate value of each induction point is integer.
In one embodiment, a kind of contactor control device with multi-point touch function includes：A plurality of first line of induction, a plurality of
Two lines of induction, one first driver element, one second driver element and a control unit.
A plurality of first line of induction is parallel to each other configuration.A plurality of second line of induction be parallel to each other configuration and with first line of induction
Staggeredly.First driver element is electrically connected with first line of induction, and the second driver element is electrically connected with second line of induction.
Control unit enables the first driver element and the second driver element, to cause the first driver element sequentially to scan first
The line of induction and the first analogue data for producing each first line of induction of correspondence, and the second driver element sequentially scan second line of induction
And produce the second analogue data of each second line of induction of correspondence.First driver element and the second driver element are respectively by the first simulation
Data are converted into the first numerical data and the second numerical data with the second analogue data.Control unit is according to an at least threshold values, each
The differentiated data of the differentiated data of first numerical data and each second numerical data judges at least one effective position of touch.Wherein,
Each effective position of touch is the coordinate value and another touch-control in one second line of induction by the touch point in one first line of induction
The coordinate value of point is constituted.
To sum up, according to the present invention the contactor control device with multi-point touch function, the method for detecting of its multi-point touch and its
Coordinate calculation method judges the number and/or coordinates computed of finger with the differential mode between multiple induction points, with lifting pair
The tolerance of noise, so as to improve the computational accuracy of the coordinate of touch point.
Brief description of the drawings
Fig. 1 is the schematic diagram of the contactor control device according to an embodiment of the invention with multi-point touch function.
Fig. 2 is the flow chart of the method for detecting of multi-point touch according to an embodiment of the invention.
Fig. 3 is the schematic diagram of an embodiment of the control unit of the 1st figure.
Fig. 4 is the waveform diagram of an embodiment of numerical data.
Fig. 5 is digital sense value-coordinate graph of a relation of an embodiment of once differentiation data.
Fig. 6 is differential numerical value-coordinate graph of a relation of an embodiment of second differential data.
Fig. 7 is digital sense value-coordinate graph of a relation of another embodiment of numerical data.
Wherein, description of reference numerals is as follows：
110 contact panels
112 first lines of induction
114 second lines of induction
130 first driver elements
150 second driver elements
170 control units
171 derivative modules
173 identification modules
175 comparison modules
177 computing modules
210 scan each lines of induction to obtain corresponding analogue data
This analogue data is converted into numerical data by 230
250 pairs of this numerical datas carry out differential calculation to obtain a differentiated data
270 numerical data according to corresponding to each touch point calculates corresponding coordinate value
S1 numerical datas
S2 numerical datas
F (x) functions
(x-1) coordinate value of induction point
The coordinate value of x induction points
(x+1) coordinate value of induction point
The coordinate value of (x+ δ) touch point
Embodiment
For above and other objects of the present invention, feature and advantage can be become apparent, it is cited below particularly go out the present invention
Specific embodiment, and coordinate accompanying drawing, it is described in detail below.
A kind of reference picture 1, contactor control device with multi-point touch function includes a contact panel 110, one first and drives list
First 130, one second driver element 150 and a control unit 170.
Contact panel 110 includes a plurality of line of induction.In this, these lines of induction are mainly distinguished into a plurality of first line of induction 112
And a plurality of second line of induction 114.First line of induction 112 is extended with first direction, parallel to each other and interval is configured.Second sense
Line 114 is answered to extend with second direction, parallel to each other and interval is configured.First direction interlocks with second direction.It is preferred that first
Direction is to be generally perpendicular to second direction.In other words, these first lines of induction 112 interlock with these second lines of induction 114, and
First line of induction 112 is generally perpendicular to second line of induction 114.Wherein, the phase of first line of induction 112 and second line of induction 114
It is indivedual insulation gaps at friendship.
First driver element 130 is electrically connected with first line of induction 112, and the second driver element 150 is electrically connected with second and felt
Answer line 114.Control unit 170 is electrically connected with the first driver element 130 and the second driver element 150.
Collocation reference picture 2, control unit 170 enables the first driver element 130 and the second driver element 150, to cause
First driver element 130 driving scan signal sequentially scans first line of induction 112, and the second driver element 150 drive it is another
Scanning signal sequentially scans second line of induction 114（Step 210）.
In scanning, the first driver element 130 can detect an analogue data from first line of induction 112 scanned（Below
Referred to as the first analogue data）（Step 210）.First analogue data has multiple on this corresponding first line of induction 112 respectively
The sensing value of induction point.There is an analog-digital converter in first driver element 130.This analog-digital converter is by the first mould
Intend data conversion into numerical data S1（Hereinafter referred to as the first numerical data S1）, and the first numerical data S1 is exported to control
Unit 170（Step 230）.
In scanning, the second driver element 150 can detect an analogue data from second line of induction 114 scanned（Below
Referred to as the second analogue data）（Step 210）.Second analogue data has multiple on this corresponding second line of induction 114 respectively
The sensing value of induction point.There is an analog-digital converter in second driver element 150.This analog-digital converter is by the second mould
Intend data conversion into numerical data S2（Hereinafter referred to as the second numerical data S2）Afterwards, and by the second numerical data S2 export to control
Unit 170 processed（Step 230）.
Control unit 170 then judges whether one or many according to the first numerical data S1 and the second numerical data S2
Individual effective position of touch, the instruction so as to producing the effective position of touch of correspondence.In this, each group that 170 pairs of control unit is received
Numerical data（First numerical data S1 or the second numerical data S2）Differential calculation is carried out to obtain a differentiated data, further according to one
Threshold values and differentiated data judge at least touch point for occurring in the line of induction（Step 250）.In this, in first line of induction 112
On the coordinate value of a touch point can constitute an effective touch-control position with the coordinate value of another touch point on second line of induction 114
Put.
In the presence of touch point is found, numerical data of the control unit 170 according to corresponding to each touch point calculates corresponding
Coordinate value（Step 270）.
Reference picture 3, in certain embodiments, control unit 170 include a derivative module 171, one recognize module 173 and
One comparison module 175.
Input the first driver element 130 of electric connection of derivative module 171 and the second driver element 150, and module of differentials
The output electric property connection identification module 173 of block 171.Identification module 173 is electrically connected at derivative module 171 and comparison module 175
Between.
So that first direction is X-direction and second direction is Y direction as an example, control unit 170 is in this X-axis coordinate
（First line of induction 112 of correspondence）With Y-axis coordinate（Second line of induction 114 of correspondence）Processing mode it is identical, therefore only sat below with X-axis
Mark is described in detail.
In this, analog-digital converter exports numerical data such as Fig. 4 institutes to the line of induction of correspondence one of derivative module 171
Show.
Shown numerical data has a crest in reference picture 4, figure（peak）.In general, when the numeral of this crest
Sensing value represents that a touch point is present when exceeding threshold values.
In this, control unit 170 can be judged with differentiated data, to improve the tolerance to noise.
In certain embodiments, derivative module 171 is by the numerical data received（The numerals of first numerical data S1 or second
Data S2）Second differential is carried out to obtain one group of second differential data.
By taking the numerical data that Fig. 4 is shown as an example, numerical data is subjected to differential, that is, performs f (x)-f (x-1), to obtain once
Differentiated data（As shown in Figure 5）.As seen from Figure 5, show in Fig. 4 crest correspondence position have one from positive values to negative value intersection
Point.
Fig. 5 once differentiation data are subjected to differential again, that is, perform f " (x)=(f (x+1)-f (x))-(f (x)-f (x-
1)), with second differential data（As shown in Figure 6）.As seen from Figure 6, the correspondence position of crest is shown in Fig. 4 an extreme value.
Therefore, identification module 173 receives the second differential data from derivative module 171, and detects second differential number
According to extreme value.Comparison module 175 will recognize the obtained extreme value of module 173 and takes absolute value again, and by this absolute value and threshold values ratio
Compared with.When this absolute value is more than threshold values, comparison module 175 judges that this extreme value position has a touch-control, i.e. touch point to deposit
.When this absolute value is not more than threshold values, comparison module 175 then judges that this extreme value position occurs without touch-control, i.e. non-touch-control
Point is present.
In this, control unit 170 also includes a computing module 177.Comparison module 175 is electrically connected at identification module 173
Between computing module 177.In the presence of comparison module 175 judges touch point, computing module 177 is then right according to this touch point institute
The numerical data answered calculates the coordinate value of touch point.
In this, the Computing Principle of computing module 177 is as follows.
Assuming that the numerical data of one first line of induction 112 of correspondence is as shown in Figure 7.Wherein, function f (x) is represented by any
Continuous coordinate value is the digital sense value curve of 3 induction points such as (x-1), x, (x+1), wherein, the coordinate value of each induction point
For integer, touch point betides coordinate value (x+ δ).
For f'(x+ δ) Taylor expansion is performed, as shown in following formula 1：
F ' (x+ δ)=f ' (x)+δ f " (x)+... formula 1
Because the slope of peak is 0, i.e. f ' (x+ δ)=0, and ignore the high-order term that Taylor opens up the formula, thus it is available
Following formula 2：
The formula 2 of f ' (x)+δ f " (x)=0
And following formula 3 can be derived from by formula 2：
Formula 3
Therefore, by once differentiation f ' (x) and second differential f " (x) of the coordinate value for the function f (x) of x induction point
Try to achieve the coordinate value (x+ δ) of peak.
Wherein, once differentiation f'(x) with second differential f " (x) be respectively following formula 4 and formula 5：
Formula 4
F " (x)=f (x+1) -2f (x)+f (x-1) formula 5
Formula 4 and the substitution formula 3 of formula 5 be can obtain into following formula 6：
Formula 6
From formula 6, function f (x) and the coordinate value of the induction point that computing module 177 can be x using coordinate value are (x+1)
Induction point function f (x+1) difference value（f(x+1)-f(x)）And coordinate value is the function f (x- of the induction point of (x-1)
1) with difference value of the coordinate value for the function f (x) of x induction point（f(x)-f(x-1)）Calculate the coordinate value (x+ of touch point
δ)。
Again by taking the numerical data that Fig. 4 is shown as an example, the coordinate value for the induction point of crest occur is x=9（Its numerical data
Digital sense value is 24）, and the coordinate value of the proximity induction point of peak both sides is respectively x-1=8（Its digital sense value is 22）
And x+1=10（Its digital sense value is 21）.Computing module 177 calculates the seat of touch point according to formula 6 and corresponding numerical data
Scale value (x+ δ), can obtain x+ δ=8.9.It can be seen that, although occur in that crest at coordinate value x=9, but actual touch point and differ
Fixed and to occur from 8~10 any one position just on the position, that is, the induction point for the crest occur is simply and actual
The immediate induction point of touch point, and the position of actual touch point can be just more precisely computed out by above-mentioned formula,
It is exactly that the center-of-mass coordinate of touch point is located at 8.9.
To sum up, according to the present invention the contactor control device with multi-point touch function, the method for detecting of its multi-point touch and its
Coordinate calculation method judges the number and/or coordinates computed of finger with the differential mode between multiple induction points, with lifting pair
The tolerance of noise, so as to improve the computational accuracy of the coordinate of touch point.
To sum up institute is old, and no matter the present invention shows its totally different feature in prior art with regard to purpose, means and effect, but
It should be noted that above-mentioned many embodiments are illustrated only for the purposes of explanation, the interest field that the present invention is advocated certainly should
To be defined described in claims, rather than it is only limitted to above-described embodiment.
Claims (10)
1. a kind of method for detecting of multi-point touch, including：
First line of induction and second line of induction is scanned to respectively obtain corresponding first analogue data and the second analogue data；
First analogue data and second analogue data are converted into the first numerical data and the second numerical data respectively；
First numerical data and second numerical data are carried out differential calculation to obtain differentiated data；
According to a threshold values and respectively the differentiated data judges at least one effective position of touch, wherein effective position of touch be by
The coordinate value of the coordinate value of a touch point on first line of induction and another touch point on second line of induction is constituted；
And
The numerical data according to corresponding to the respectively touch point calculates the coordinate value of touch point,
Wherein first line of induction interlocks with second line of induction, and first line of induction is generally perpendicular to second sensing
Line.
2. the method for detecting of multi-point touch as claimed in claim 1, the wherein differential calculation are to carry out two to the numerical data
Subdifferential.
3. the method for detecting of multi-point touch as claimed in claim 1, wherein judging occur in the corresponding line of induction at least
One touch point also includes：
Compare the absolute value and the threshold values of each extreme value in the differentiated data；And
When the absolute value is more than the threshold values, touch point presence is determined with.
4. the coordinate value of the method for detecting of multi-point touch as claimed in claim 1, the wherein touch point is according to following equation meter
Calculate：
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Wherein, it is the coordinate value with the immediate induction point of the touch point, the f that the x+ δ, which represent the coordinate value of the touch point, the x,
() is by the correspondingly function of the digital sense value curve of induction point and respectively the coordinate value of the induction point is integer.
5. a kind of Coordinate calculation method, including：
First line of induction and second line of induction is scanned to respectively obtain corresponding first analogue data and the second analogue data；
First analogue data and second analogue data are converted into the first numerical data and the second numerical data respectively；
First numerical data and second numerical data are carried out differential calculation to obtain differentiated data；
According to a threshold values and respectively the differentiated data judges at least one effective position of touch for occurring in the corresponding line of induction, its
In effective position of touch be by the touch point on first line of induction coordinate value with it is another on second line of induction
The coordinate value of one touch point is constituted；And
Multiple difference values between the multiple induction points closed on according to the respectively touch point calculate the coordinate value of touch point, wherein respectively
The coordinate value of the induction point is integer.
6. the coordinate value of Coordinate calculation method as claimed in claim 5, the wherein touch point is calculated according to following equation：
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Wherein, it is the coordinate value with the immediate induction point of the touch point, the f that the x+ δ, which represent the coordinate value of the touch point, the x,
() is by the correspondingly function of the digital sense value curve of induction point and respectively the coordinate value of the induction point is integer.
7. a kind of contactor control device with multi-point touch function, including：
A plurality of first line of induction, be parallel to each other configuration；
A plurality of second line of induction, is parallel to each other and configures and interlock with those first lines of induction；
One first driver element, is electrically connected with above-mentioned a plurality of first line of induction, is produced with sequentially scanning first line of induction pair
Should each first line of induction one first analogue data, and respectively first analogue data is converted into one first numerical data；
One second driver element, is electrically connected with above-mentioned a plurality of second line of induction, is produced with sequentially scanning second line of induction pair
Should each second line of induction one second analogue data, and respectively second analogue data is converted into one second numerical data；With
And
One control unit, to enable first driver element and second driver element, and according to an at least threshold values, respectively this
The differentiated data of the differentiated data of one numerical data and respectively second numerical data judges at least one effective position of touch, wherein respectively
Effective position of touch be by the touch point on one of above-mentioned a plurality of first line of induction coordinate value with above-mentioned a plurality of
The coordinate value of another touch point on one of second line of induction is constituted.
8. there is the contactor control device of multi-point touch function as claimed in claim 7, wherein respectively the differentiated data is micro- one or two times
Divided data.
9. having the contactor control device of multi-point touch function as claimed in claim 7, wherein the control unit was respectively should
The absolute value of each extreme value in differentiated data and the threshold values, and when the absolute value is more than the threshold values, it is determined with the touch-control
Point is present.
10. having the contactor control device of multi-point touch function as claimed in claim 7, the wherein control unit is used to according to following
Formula calculates the coordinate value of the respectively touch point：
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<mo>-</mo>
<mo>(</mo>
<mn>2</mn>
<mi>x</mi>
<mo>+</mo>
<mn>1</mn>
<mo>)</mo>
<mo>(</mo>
<mi>f</mi>
<mo>(</mo>
<mi>x</mi>
<mo>)</mo>
<mo>-</mo>
<mi>f</mi>
<mo>(</mo>
<mrow>
<mi>x</mi>
<mo>-</mo>
<mn>1</mn>
</mrow>
<mo>)</mo>
<mo>)</mo>
</mrow>
<mrow>
<mn>2</mn>
<mo>&lsqb;</mo>
<mrow>
<mo>(</mo>
<mo>(</mo>
<mrow>
<mi>f</mi>
<mrow>
<mo>(</mo>
<mrow>
<mi>x</mi>
<mo>+</mo>
<mn>1</mn>
</mrow>
<mo>)</mo>
</mrow>
<mo>-</mo>
<mi>f</mi>
<mrow>
<mo>(</mo>
<mi>x</mi>
<mo>)</mo>
</mrow>
</mrow>
<mo>)</mo>
<mo>-</mo>
<mo>(</mo>
<mi>f</mi>
<mo>(</mo>
<mi>x</mi>
<mo>)</mo>
<mo>-</mo>
<mi>f</mi>
<mo>(</mo>
<mrow>
<mi>x</mi>
<mo>-</mo>
<mn>1</mn>
</mrow>
<mo>)</mo>
<mo>)</mo>
</mrow>
<mo>&rsqb;</mo>
</mrow>
</mfrac>
</mrow>
Wherein, it is the coordinate value with the immediate induction point of the touch point, the f that the x+ δ, which represent the coordinate value of the touch point, the x,
() is by the correspondingly function of the digital sense value curve of induction point and respectively the coordinate value of the induction point is integer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW102136096A TWI493424B (en) | 2013-10-04 | 2013-10-04 | Multi-touch device, method for detecting multi-touch thereof and method for calculating coordinate |
| TW102136096 | 2013-10-04 |
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| CN108021260B (en) * | 2016-10-28 | 2021-06-11 | 矽统科技股份有限公司 | Touch detection method |
| CN108958565B (en) * | 2018-09-26 | 2021-05-04 | 深圳市德明利技术股份有限公司 | Coordinate calculation method for multi-point capacitive touch, touch device and mobile terminal |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1942853A (en) * | 2004-05-06 | 2007-04-04 | 苹果电脑有限公司 | Multipoint touchscreen |
| CN102460357A (en) * | 2009-05-29 | 2012-05-16 | 3M创新有限公司 | High speed multi-touch touch device and controller therefor |
| CN103186304A (en) * | 2013-01-21 | 2013-07-03 | 敦泰科技有限公司 | Single-layered self-capacitance touch screen for realizing multi-point touch identification and data processing method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2005022372A1 (en) * | 2003-08-29 | 2005-03-10 | Nokia Corporation | Method and device for recognizing a dual point user input on a touch based user input device |
| TWI387914B (en) * | 2008-08-13 | 2013-03-01 | Au Optronics Corp | Projective capacitive touch apparatus, and method for identifying multi-touched positions |
| CN100594475C (en) * | 2008-08-26 | 2010-03-17 | 友达光电股份有限公司 | Projection type capacitance touch control device and method for recognizing different contact position |
| KR101398238B1 (en) * | 2010-10-01 | 2014-05-22 | 엘지디스플레이 주식회사 | Display device having touch screen panel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1942853A (en) * | 2004-05-06 | 2007-04-04 | 苹果电脑有限公司 | Multipoint touchscreen |
| CN102460357A (en) * | 2009-05-29 | 2012-05-16 | 3M创新有限公司 | High speed multi-touch touch device and controller therefor |
| CN103186304A (en) * | 2013-01-21 | 2013-07-03 | 敦泰科技有限公司 | Single-layered self-capacitance touch screen for realizing multi-point touch identification and data processing method thereof |
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| TWI493424B (en) | 2015-07-21 |
| CN104516569A (en) | 2015-04-15 |
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