CN102819369A - Method for calculating accuracy of touch coordinate of capacitance improved type multi-point touch control system - Google Patents
Method for calculating accuracy of touch coordinate of capacitance improved type multi-point touch control system Download PDFInfo
- Publication number
- CN102819369A CN102819369A CN2012102605616A CN201210260561A CN102819369A CN 102819369 A CN102819369 A CN 102819369A CN 2012102605616 A CN2012102605616 A CN 2012102605616A CN 201210260561 A CN201210260561 A CN 201210260561A CN 102819369 A CN102819369 A CN 102819369A
- Authority
- CN
- China
- Prior art keywords
- raw data
- image raw
- linearization
- row
- digitized video
- 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.)
- Granted
Links
Images
Landscapes
- Position Input By Displaying (AREA)
Abstract
The invention provides a method for calculating the accuracy of a touch coordinate of a capacitance improved type multi-point touch control panel system. The method orderly comprises the following steps that: after a drive detecting device and an analog digital conversion device are initialized, and a capacitive touch control panel is driven and detected to generate image raw data, the image raw data is transformed to digital image raw data through the analog digital conversion device; the digital image raw data is subjected to denoising and linearity operation increase orderly through a control device to generate linearized raw data; the linearized raw data is subjected to an integrated accumulation operation to generate integrated image raw data; the integrated image raw data is subjected to an accumulative error removal operation to generate accumulative error removal image raw data; and according to the clear accumulative error image raw data, a touch coordinate calculation is executed. The method provided by the invention efficiently improves the calculation accuracy of the touch coordinate of the capacitive multi-point touch control panel and promotes the signal noise ratio.
Description
Technical field
The present invention refers to a kind of method of promoting the touch coordinate accuracy in computation of condenser type multi-point touch system especially about the contact panel technical field.
Background technology
Modern consumption type electronic apparatus polygamy is equipped with Trackpad as one of its input media.For meeting demands such as light, thin, short, little, Trackpad is also many to become contact panel with the panel integration, imports in order to make things convenient for the user.Trackpad can be divided into resistance-type, condenser type, acoustic wave, and four kinds of optical profile types etc. according to the difference that detects principle, and is wherein, general with capacitance type touch-control panel again at present.
General capacitance type touch-control panel method of driving has judged whether that by the variation of ground capacitance value object is near capacitance type touch-control panel for detecting each strip conductor line ground capacitance.This is existing self-induction electric capacity (self capacitance) and detects, and wherein, self-induction electric capacity or ground capacitance are not entity capacitance, and it is the parasitism and the stray capacitance of each strip conductor line.The synoptic diagram that Fig. 1 detects for existing self-induction electric capacity (self capacitance), it is in the cycle very first time, and the conductor lines that drives first directions by the driving and the detecting device 110 of first direction earlier is in order to the self-induction electric capacity charging to the conductor lines of first direction.Again in second time cycle, drive and the conductor lines of detecting device 110 detecting first directions on voltage.Again in the 3rd time cycle, the conductor lines that drives second directions by the driving and the detecting device 120 of second direction is with the self-induction electric capacity charging to the conductor lines of second direction.Again in the 4th time cycle, drive and the conductor lines of detecting device 120 detecting second directions on voltage.
Existing self-induction electric capacity (self capacitance) detection method among Fig. 1 is connected with driving circuit and testing circuit simultaneously on same strip conductor line; After earlier conductor lines being driven; Again same conductor lines is detected the variable quantity of its signal, and then decision self-induction capacitance size.Its advantage is that data quantity is less, picture frame row data (frame row data) obtains fast, and lower power consumption, its shortcoming for easily because of the suspension joint conductor on the contact panel causes the touch points erroneous judgement, and the phenomenon etc. that has ghost during multi-point touch.If promptly actual position of touch is position A, position B shown in figure, can produce the position A ' and the position B ' of two other non-actual position of touch, position A ' and position B ' are " ghost " of position A, position B.
Be detection mutual induction electric capacity (mutual capacitance about the capacitance type touch-control panel method of driving; Cm) size variation; In order to have judged whether that object is near contact panel; Likewise, mutual induction electric capacity (Cm) is not entity capacitance, and it is a mutual induction electric capacity (Cm) between the conductor lines of conductor lines and second direction of first direction.The synoptic diagram that Fig. 2 detects for existing mutual induction electric capacity (Cm), as shown in Figure 2, driver 210 is disposed on the first direction (Y); Detecting device 220 is disposed on the second direction (X), before very first time cycle T 1 during the semiperiod, is driven by the conductor lines 230 of 210 pairs of first directions of driver; Its working voltage Vy_1 is to mutual induction electric capacity (Cm) 240 charging, and when later half cycle of very first time cycle T 1, all detecting devices 220 detect the voltage (Vo_1 on the conductor lines 250 of all second directions; Vo_2 ..., Vo_n); To obtain n data, behind m drive cycle, can obtain m * n data.In real system, these drivers 210 and detecting device 220 are in same IC, to save cost.
The advantage of mutual induction electric capacity (Cm) detection method is the signal different directions of suspension joint conductor and earth conductor, so can judge whether to be the human body touching very easily.Simultaneously, because the true coordinate of each point is arranged, when multiple spot touches simultaneously, can tell the actual position of each point, mutual induction electric capacity (Cm) detection method is supported the application of multi-point touch easily.
Yet; When object comes close to or in contact with contact panel; Because the voltage signal that the noise that produces on human body, environment, the panel will make detecting device 220 detected produces serious shake; Cause the instability of the touch coordinate that is calculated, so significantly reduce whole touching system signal noise ratio (Signal to Noise Ratio, SNR).Simultaneously, in the touch-control system of reality, be commonly referred to as on the detection line direction (being the Y direction),, be easy to generate noise as when touching, and the accuracy when influence touch coordinate calculating.Therefore, the real space that still has improvement of the technology of existing detecting capacitance type touch control panel.
Summary of the invention
The object of the invention mainly provides a kind of method of promoting the touch coordinate accuracy in computation of condenser type multi-point touch system, with increase touch coordinate accuracy in computation, and the signal noise ratio of elevator system (SNR).
According to a characteristic of the present invention; The present invention proposes a kind of method of promoting the touch coordinate accuracy in computation of condenser type multi-point touch system; This system includes a capacitance type touch-control panel, and drives pick-up unit, an analog-digital commutator, reaches a control device; Capacitance type touch-control panel comprises the n row line of induction and m row drive wire; Said driving pick-up unit comprises m driver and n detecting device, drives and detects in order to carry out electric capacity respectively, and this said analog-digital commutator is connected to this said driving pick-up unit; To carry out the analog digital conversion, this said method comprises: (A) this said control device to this said driving pick-up unit, and should said analog-digital commutator execution initialization; (B) driver and the detecting device in this said driving pick-up unit drives and detects this said capacitance type touch-control panel respectively, to produce image raw data (image raw data); (C) this said analog-digital commutator should said image raw data (image raw data) convert digitized video raw data (digital image raw data) into; (D) this said control device is carried out denoising and is increased linearity computing this said digitized video raw data (digital image raw data), to produce linearization image raw data (linearized image raw data); (E) this said control device is carried out the integration accumulating operation to said linearization image raw data (linearized image raw data), to produce integration image raw data (integrated image raw data); (F) said control device is carried out said integration image raw data (integrated image raw data) and is removed the add up error computing; To remove the add up error in the said integration image raw data (integrated image raw data), go add up error image raw data with generation; And (G) the said add up error image raw data execution of said control device foundation touch coordinate calculating, to produce the touch coordinate value on the said capacitance type touch-control panel.
According to another characteristic of the present invention, the present invention proposes a kind of condenser type multi-point touch system, and said condenser type multi-point touch system comprises a capacitance type touch-control panel, and drives pick-up unit, an analog-digital commutator and a control device.Said capacitance type touch-control panel has the m row drive wire and reaches in the n row line of induction.Said driving pick-up unit comprises m driver and n detecting device, is connected to said capacitance type touch-control panel, drives and detects in order to carry out electric capacity respectively, to produce the image raw data.Said analog-digital commutator is connected to said driving pick-up unit, in order to said image raw data is carried out the analog digital conversion, to produce the digitized video raw data.Said control device is in order to the step in the manner of execution (D)-(E).
Method of the present invention is because consideration of noise and increase problem such as the linearity and because of reducing common noise (common noise) problems such as the add up error that produces, the touch coordinate accuracy in computation that can promote condenser type multi-point touch panel effectively.
Description of drawings
Fig. 1 is the synoptic diagram of existing self-induction capacitance detecting;
Fig. 2 is the synoptic diagram of existing mutual induction capacitance detecting;
Fig. 3 is the calcspar of condenser type multi-point touch of the present invention system;
Fig. 4 promotes the process flow diagram of method of the touch coordinate accuracy in computation of condenser type multi-point touch panel for the present invention;
Fig. 5 carries out denoising for the present invention and increases the detail flowchart of linearity computing;
Fig. 6 carries out denoising for the present invention and increases the synoptic diagram of linearity computing;
Fig. 7 drives the running synoptic diagram of first detecting device in the pick-up unit 320 for the present invention;
Fig. 8 carries out the synoptic diagram of integration accumulating operation for the present invention;
Fig. 9 carries out the detail flowchart of removing the add up error computing for the present invention.
[explanation of main element symbol unit]
Drive and detecting device 110 driving and detecting device 120 drivers 210 detecting devices 220
The conductor lines 240 of conductor lines 230 second directions of first direction
The low standby power loss drive system 300 of condenser type multi-point touch
Capacitance type touch-control panel 310 drives pick-up unit 320
Analog-digital commutator 330 control device 340
First conductor lines, 311 second conductor lines 312
Embodiment
Fig. 3 is the synoptic diagram of condenser type multi-point touch of the present invention system.This condenser type multi-point touch system 300 includes a capacitance type touch-control panel 310, and drives pick-up unit 320, an analog-digital commutator 330, an and control device 340.
This capacitance type touch-control panel 310 has m bar first conductor lines 311 (comprising Y1-Y6......) that distributes in first direction (Y) and reaches n bar second conductor lines 312 (comprising X1-X6.....) that distributes in second direction (X); First conductor lines 311 is as drive wire, and second conductor lines 312 is as the line of induction.This driving pick-up unit 320 is connected to this capacitance type touch-control panel 310; Drive and detect in order to carry out electric capacity; To produce the image raw data, this driving pick-up unit 320 comprises m driver and n detecting device (not shown), with respectively corresponding m bar first conductor lines 311 and n bar second conductor lines 312; Be that each strip conductor line 311 is connected with a driver, each second conductor lines 312 is connected with a detecting device.This analog-digital commutator 330 is connected to the detecting device in this driving pick-up unit 320, in order to this image raw data is carried out the analog digital conversion, to produce the digitized video raw data.This control device 340 can have a storage element 341, detects and by being produced data such as image raw data (image raw data) in the process of obtaining touch coordinate with temporary 320 pairs of these capacitance type touch-control panels 210 of this driving pick-up unit.This control device 340 calculates the touch coordinate on this capacitance type touch-control panel 210 according to image raw data (image raw data).
Fig. 4 promotes the process flow diagram of method of the touch coordinate accuracy in computation of condenser type multi-point touch panel for the present invention.At first in step (A), 340 pairs of this control device should drive pick-up unit 320, reach this analog-digital commutator 330 execution initialization.Wherein comprise this driving pick-up unit 320 of initializing set when Inductance and Capacitance (mutual capacitance) or self-capacitance (self capacitance) driving detection; Parameters such as the number of drive waveforms, frequency, kenel, and the frequency of operation of setting this analog-digital commutator 330.
In step (B), driver in this driving pick-up unit 320 and detecting device drive and detect this capacitance type touch-control panel 310 respectively, in order to produce an image raw data (image raw data).This driving pick-up unit 320 can be carried out Inductance and Capacitance (mutual capacitance) and drive and detect, and also can carry out self-capacitance (self capacitance) and drive and detect to produce this image raw data (image raw data).This capacitance type touch-control panel 310 is driven and detects; Promptly give connected every first conductor lines 311 load driver electric signal, detect because touch-control output electric signal on every second conductor lines 312 when causing mutual capacitance Cm or self-capacitance to send out changing of Cs through each detecting device through each driver that drives in the pick-up unit 320.
In step (C), this analog-digital commutator 330 converts this image raw data (image raw data) into digitized video raw data (digital image raw data); This digitized video raw data (digital image raw data) can be stored in this storage element 341, uses for this control device 340 subsequent treatment.Wherein, Owing to have capable first conductor lines 311 and n row second conductor lines 312 of m; Therefore, in all corresponding stroke numeral image raw data of first conductor lines 311 and second conductor lines, 312 infall positions, each 312 pairs of bar second conductor lines should have m stroke numeral image raw data; Therefore, the digitized video raw data that whole capacitor formula contact panel is corresponding has the capable n row of m and amounts to m * n pen.
In step (D), 340 pairs of these digitized video raw data of this control device (digital image raw data) are carried out denoising and are increased linearity computing, to produce linearization image raw data (linearized image raw data).
Fig. 5 carries out denoising for the present invention and increases the detail flowchart of linearity computing.Capacitance type touch-control panel has the n row line of induction; The common intersection with the m row drive wire of each row line of induction also has m position; Also just to m stroke numeral image raw data should be arranged; Therefore, can be that process object is carried out following steps with each corresponding stroke numeral image raw data of each position in each row line of induction, can obtain the corresponding linearization raw data of whole capacitor touch panel.In detail as follows:
In step (D1), this control device 340 is by the digitized video raw data that reads N position in the row line of induction (column) wherein in this storage element 341, wherein, N=1,2 ..., m.
In step (D2), judge whether the digitized video raw data of this N position surpasses a critical value Th.The large-scale statistical of the digitized video raw data that this critical value Th produces when touching having obtains.
In step (D3), if judging the digitized video raw data of this N position, step (D2) surpasses this critical value Th, then keep the digitized video raw data of this N position.
In step (D4), if the digitized video raw data that step (D2) is judged this N position surpasses this critical value Th, judge again should row in, with the digitized video raw data of this adjoining position, N position whether above this critical value Th.Wherein, with the adjoining digitized video raw data in this N position for example can be in these row the corresponding digitized video raw data in this N two position above the position or in following two data that the position is corresponding.That is, be arranged in this N-1 position of same row, the corresponding respectively digitized video raw data in a N-2 position, perhaps corresponding digitized video raw data is distinguished in N+1 position, a N+2 position.In another one embodiment of the present invention; Can select this N-1 position in the same row, a N-2 position, a N-3 position to distinguish corresponding digitized video raw data, perhaps corresponding digitized video raw data is distinguished in N+1 position, a N+2 position, a N+3 position.In other words, can select N several corresponding digitized video raw data in perhaps following several positions above the position according to the actual requirements.
If judging, step (D4) is somebody's turn to do in the row; Surpass this critical value Th with the digitized video raw data of this adjoining position of N, N position; The digitized video raw data that then in step (D3), keeps this N position; If not, then in step (D5), the digitized video raw data of this N position is removed and is made as 0 again; Afterwards, in step (D6), change next column, and execution in step (D2)-(D4).
Fig. 6 carries out denoising for the present invention and increases the synoptic diagram of linearity computing.In this synoptic diagram, this critical value Th is 200.As shown in Figure 6, in the 2nd row line of induction, intersect altogether m position with m bar drive wire, therefore, have m stroke numeral image raw data.There is the touching of generation phenomenon at the F place to position A to the position, so the value of digitized video raw data is than higher.In the 10th column drive wire, m stroke numeral image raw data is arranged equally.B ' has located to produce the touching phenomenon to position A ' to the position.Position C, D are because the digitized video raw data 250,250 that position A, B are corresponding respectively above it has one greater than this critical value 200, thus the digitized video original number of retention position C, D correspondence, 150,120.Position E is because in the corresponding digitized video raw data in two positions place one digitized video raw data to be arranged below it be 213; Greater than this critical value 200; Event is the corresponding digitized video raw data 110 of retention position E also, in like manner the corresponding digitized video raw data of retention position F.Position C ', D ' are owing to the digitized video raw data 250,250 of two positions A, B correspondence above it has one greater than this critical value Th, the digitized video raw data 150,120 of retention position C ', D '.Position E ' is not because corresponding digitized video raw data and the corresponding digitized video raw data of following two positions of top two positions all has one greater than this critical value 200, so the digitized video raw data that this position is corresponding is removed by 110 and is reset to 0.
In the prior art, when position C, D, C ', and the digitized video raw data of D ' during less than this critical value Th, then with this position C, D, C ', and the data of D ' be made as 0, so be easy to generate discontinuous phenomenon.Can know by Fig. 6, position C, D, C ', and D ' though its digitized video raw data less than this critical value Th, but still keeps its digitized video raw data, can increase the linearity by this, avoid producing discontinuous phenomenon.
In step (E); 340 pairs of these linearization image raw data of this control device (linearized image raw data) are carried out the integration accumulating operation; With generation integration image raw data (integrated image raw data), and be temporary in this storage element 341.
This driving pick-up unit 320 has n detecting device, and each detecting device can subtract each other two linearization image raw data (linearized image raw data) data of upper-lower position in the line of induction of its detection, to reduce common noise (common noise).Fig. 7 drives the running synoptic diagram of first detecting device in the pick-up unit 320 for the present invention.Shown in Figure 7, which is the second original document image data linearization D (2,1) linear image by subtracting the original first data D (1,1), the Third linearization raw image data D (3 , 1) minus the second tranche of linear image raw data D (2,1), ... m-document D (m, 1) minus the first m-1 document (s) D (m-1, 1), m is the number of drives, and so forth.So need in step (E), this linearization image raw data (linearized image raw data) to be carried out the integration accumulating operation.
This integration image raw data (integrated image raw data) has m * n pen.Fig. 8 carries out the synoptic diagram of integration accumulating operation for the present invention.That is; Detect by 320 pairs of these capacitance type touch-control panels 310 of this driving pick-up unit earlier at the beginning; The voltage that is detected changes into digitized video raw data (digital image raw data) via this analog-digital commutator 330; This digitized video raw data (digital image raw data) via denoising and the computing of the increase linearity, can obtain stable and preferable this linearization image raw data (linearized image raw data) of the linearity, again by the integration accumulating operation again; And then obtain the signal of each detecting device or the signal of each passage (channel).
In other embodiment, in step (E) afterwards, but execution in step (E1).Step (E1) is carried out sign counter-rotating computing for the integration image raw data that step (E) is generated, and then convenient follow-up computing.
In step (F); 340 pairs of these integration image raw data of this control device (integrated image raw data) are carried out and are removed the add up error computing; In order to remove the add up error in this integration image raw data (integrated image raw data), go add up error image raw data (cumulative error image raw data) with generation.
Fig. 9 carries out the detail flowchart of removing the add up error computing for the present invention.In step (F1), this control device 340 amounts to the m pen by the linearization image raw data that this storage element 341 reads in row (column) line of induction.
In step (F2), this control device 340 judges in these row whether finishing touch linearization image raw data and this are listed as the second last reciprocal linearization image raw data similar.This step can realize by means of one first threshold value Threshold1.The absolute value of difference that is listed as the second last reciprocal linearization image raw data when finishing touch linearization image raw data and this is during less than one first threshold value Threshold1, and it is similar to judge that then this row finishing touch linearization image raw data and this are listed as the second last reciprocal linearization image raw data.
In step (F3), if it is similar to judge that this row finishing touch linearization image raw data and this are listed as the second last reciprocal linearization image raw data, removing this row finishing touch linearization image raw data also is 0 again.
In step (F4), if it is dissimilar to judge that this row finishing touch linearization image raw data and this are listed as the second last reciprocal linearization image raw data, then read the linearization image raw data that this is listed as M position, wherein, and M=1,2 ..., m.Because this driving pick-up unit 320 has m driver, so each bar detection line or each are shown m linearization image raw data.
In step (F5), judge whether the linearization image raw data of this M position is finishing touch linearization image raw data in these row.If the linearization image raw data of M position is the corresponding linearization image raw data of corresponding m driver, then just confirm as finishing touch linearization image raw data.M＝1、2......m。
In step (F6), if the linearization image raw data of judging this M position reads the linearization image raw data of M+1 position of these row not for the finishing touch linearization image raw data in these row.
In step (F7), judge whether the linearization image raw data of this M position is similar with the linearization image raw data of this M+1 position.This step can specifically realize by means of the second threshold value Threshold2; When the absolute value of the difference of the linearization image raw data of the linearization image raw data of this M position and this M+1 position during, judge that then the linearization image raw data of this M position is similar with the linearization image raw data of this M+1 position less than one second threshold value Threshold2.
In step (F8), if judge that the linearization image raw data of this M position is similar with the linearization image raw data of this M+1 position, with the linearization image raw data removing of this M position and be reset to 0; And
In step (F9), read the linearization image raw data of M+1 position of these row, the execution in step of laying equal stress on (F4)-(F8).
In step (F7), if judge the linearization image raw data of this M position and the linearization image raw data dissmilarity of this M+1 position, then execution in step (F9).
In step (F5); If judge that the linearization image raw data of this M position is the finishing touch linearization image raw data of these row; Then in step (F10), change next column, and in execution in step (F1), to read the original m pen of linearization image in the next column line of induction.
In step (G), this control device 340 goes add up error image raw data (cumulative error image raw data) to carry out touch coordinate calculating according to this, to produce the coordinate figure on this capacitance type touch-control panel.
Existing self-induction electric capacity (self capacitance) detection method or mutual induction electric capacity (Cm) detection method all is by driver 210 input signals; And by capacitance variations; Make detecting device 220 detect different charge generation voltage signals, the variation according to voltage signal has judged whether that object comes close to or in contact with contact panel again.But noise owing to the generation of the driver on human body, environment, the liquid crystal panel; With making the voltage of being detected produce serious variation; After the magnitude of voltage that changed this moment converts the numerical digit signal to via analog-digital commutator; As do not pass through the processing of computing and filtering noise, and will make on coordinate is judged, to produce error and unsettled situation, cause the signal noise ratio (SNR) of system significantly to reduce.
The method of the touch coordinate accuracy in computation of enhancement condenser type multi-point touch of the present invention system; With the image raw data (image raw data) that originally produced shake; After removing noise and increasing linearity computing, pass through the integration accumulating operation again, can obtain the signal of each detecting device or claim the signal of each passage (channel); Behind the error amount that is produced when then data dump being added up; Handle via the coordinate Calculation method again,, can judge more accurately whether conductor or finger touches panel are arranged on the capacitance type touch-control panel 310 in order to produce the touch point coordinate position.
Because prior art is not considered noise and linearity problems; Also reckoning without detecting device can subtract each other two data in front and back; In order to reduce common noise (common noise); Therefore can't the filter out power noise or the noise that produced of first conductor lines 311 (Y1-Y6) that distributes of first direction (Y) and second conductor lines 312 (X1-X6) that distributes in second direction (X) changes, and then produce the wrong and unsettled situation of coordinate on judging and take place, make the SNR of system significantly reduce.Yet method of the present invention is because consideration of noise and increase linearity problems and because of reducing the problem of common noise (common noise) add up error that produces, so can promote the touch coordinate accuracy in computation of condenser type multi-point touch panel effectively.
From the above, no matter the present invention all show it totally different in the characteristic of prior art, has practical value with regard to purpose, means and effect.Only it should be noted that above-mentioned many embodiment have been merely to be convenient to explanation and to give an example, the interest field that the present invention advocated is from should being as the criterion so that claim is said, but not only limits to the foregoing description.
Claims (14)
1. method of promoting the touch coordinate accuracy in computation of condenser type multi-point touch system; It is characterized in that said condenser type multi-point touch system includes a capacitance type touch-control panel, and drives pick-up unit, an analog-digital commutator, and a control device; Wherein, Said capacitance type touch-control panel comprises the n row line of induction and m row drive wire, and said driving pick-up unit comprises m driver and n detecting device, drives and detects in order to carry out electric capacity respectively; Said analog-digital commutator is connected to said driving pick-up unit in order to carry out the analog digital conversion, and said method comprises:
(A) said control device is carried out initialization to said driving pick-up unit and said analog-digital commutator;
(B) driver and the detecting device in the said driving pick-up unit drives and detects said capacitance type touch-control panel respectively, to produce the image raw data;
(C) said analog-digital commutator converts said image raw data into the digitized video raw data, and said digitized video raw data has the capable n row of m and amounts to m * n pen;
(D) said control device is carried out denoising and is increased linearity computing said digitized video raw data, to produce the linearization raw data;
(E) said control device is carried out the integration accumulating operation to said linearization image raw data, to produce integration image raw data;
(F) said control device is carried out said integration image raw data and is removed the add up error computing, to remove the add up error in the said integration image raw data, goes add up error image raw data with generation; And
(G) said control device is carried out touch coordinate calculating according to the said add up error image raw data of going, and then produces the touch coordinate value on the said capacitance type touch-control panel.
2. method according to claim 1 is characterized in that, said step (D) comprising:
(D1) read the digitized video raw data of N position in the row line of induction wherein, wherein, N=1,2 ..., m;
Whether the digitized video raw data of (D2) judging said N position is above a critical value;
(D3) surpass said critical value if step (D2) is judged the digitized video raw data of said N position, then keep the digitized video raw data of said N position; And
(D4) if judging the digitized video raw data of said N position, step (D2) do not surpass said critical value; Judge again in the said row; Whether surpass said critical value with the digitized video raw data of adjoining position, said N position, if then keep the digitized video raw data of said N position; If not, the digitized video raw data removing with said N position also is made as 0 again;
(D5) read the digitized video raw data of N position in the next column line of induction wherein, wherein, N=1,2 ..., m, execution in step (D2)-(D4).
3. method according to claim 2; It is characterized in that; With the digitized video raw data of adjoining position, said N position is to be positioned at N-1 position, a N-2 position described in the same row to distinguish corresponding digitized video raw data, and perhaps corresponding digitized video raw data is distinguished in N+1 position, a N+2 position.
4. method according to claim 1 is characterized in that, step (F) comprising:
(F1) the linearization image raw data that reads in the row line of induction wherein amounts to the m pen;
(F2) judge in the said row whether the said linearization image of the second last pen reciprocal raw data is similar in the finishing touch linearization image raw data and said row;
(F3) if judge in the said row that the second last reciprocal linearization image raw data is similar in the finishing touch linearization image raw data and said row, with finishing touch linearization image raw data removing in the said row and be reset to 0;
(F4) read the linearization image raw data of M position of said row, wherein, M=1,2 ..., m;
Whether the linearization image raw data of (F5) judging said M position is finishing touch linearization image raw data in the said row;
(F6) if judge that the linearization image raw data of said M position is not a finishing touch linearization image raw data in the said row, read the linearization image raw data of the M+1 position of said row;
(F7) judge whether the linearization image raw data of said M position is similar with the linearization image raw data of said M+1 position;
(F8) if judge that the linearization image raw data of said M position is similar with the linearization image raw data of said M+1 position, with the linearization image raw data removing of said M position and be reset to 0; And
(F9) read the linearization image raw data of M+1 position of said row, the execution in step of laying equal stress on (F4)-(F8).
5. method according to claim 4 is characterized in that, in the said step (F7), if judge the linearization image raw data of said M position and the linearization image raw data dissmilarity of said M+1 position, then execution in step (F9).
6. method according to claim 4; It is characterized in that; In the said step (F5); If judge that the linearization image raw data of said M position is the finishing touch linearization image raw data of said row, execution in step (F1) then is to read the linearization image raw data in the next column line of induction.
7. method according to claim 4; It is characterized in that; In the said step (F2); When the absolute value of the difference of the linearization image raw data of the second last reciprocal described in image raw data of finishing touch linearization described in the said row and the said row during, judge that then the image of finishing touch linearization described in said row raw data is similar with said the second last reciprocal linearization image raw data less than one first threshold value.
8. method according to claim 4; It is characterized in that; In the said step (F7); When the absolute value of the difference of the linearization image raw data of the linearization image raw data of said M position and said M+1 position during less than one second threshold value, the linearization image raw data of then judging said M position is similar with the linearization image raw data of said M+1 position.
9. a condenser type multi-point touch system is characterized in that, comprises:
One capacitance type touch-control panel, it has in the m row drive wire and the n row line of induction;
One drives pick-up unit, comprises m driver and n detecting device, is connected to said capacitance type touch-control panel, drives and detects in order to carry out electric capacity respectively, to produce the image raw data;
One analog-digital commutator is connected to said driving pick-up unit, in order to said image raw data is carried out the analog digital conversion, to produce the digitized video raw data; And
One control device; In order to this said driving pick-up unit and said this analog-digital commutator being carried out initialization, said this digitized video raw data is carried out denoising and increased linearity computing producing a linearization image picture raw data, more said this linearization image raw data to be carried out integration accumulating operation producing an integration image raw data, said this integration image raw data to be carried out removed add up error computing and go add up error image raw data, go add up error image raw data to carry out touch coordinate according to said this to calculate with generation with the add up error of removing in said this integration image raw data, and then produce the coordinate figure on said this capacitance type touch-control panel.
10. system according to claim 9 is characterized in that, said control device is carried out denoising and increased linearity computing said digitized video raw data and draws together to produce a linearization image picture raw data packets:
(D1) read the digitized video raw data of N position in the row line of induction wherein, wherein, N=1,2 ..., m;
Whether the digitized video raw data of (D2) judging said N position is above a critical value;
(D3) surpass said critical value if step (D2) is judged the digitized video raw data of said N position, then keep the digitized video raw data of said N position; And
(D4) if judging the digitized video raw data of said N position, step (D2) do not surpass said critical value; Judge again in the said row; Whether surpass said critical value with the digitized video raw data of adjoining position, said N position, if then keep the digitized video raw data of said N position; If not, the digitized video raw data removing with said N position also is made as 0 again;
(D5) read the digitized video raw data of N position in the next column line of induction wherein, wherein, N=1,2 ..., m, execution in step (D2)-(D4).
11. system according to claim 10; It is characterized in that; With the digitized video raw data of adjoining position, said N position is to be positioned at N-1 position, a N-2 position described in the same row to distinguish corresponding digitized video raw data, and perhaps corresponding digitized video raw data is distinguished in N+1 position, a N+2 position.
12. system according to claim 9; It is characterized in that said control device is carried out the computing of removing add up error to said integration image raw data and gone add up error image raw data to comprise with the add up error of removing in this integration image raw data with generation:
(F1) the linearization image raw data that reads in the row line of induction wherein amounts to the m pen;
(F2) judge in the said row whether the said linearization image of the second last pen reciprocal raw data is similar in the finishing touch linearization image raw data and said row;
(F3) if judge in the said row that the second last reciprocal linearization image raw data is similar in the finishing touch linearization image raw data and said row, with finishing touch linearization image raw data removing in the said row and be reset to 0;
(F4) read the linearization image raw data of M position of said row, wherein, M=1,2 ..., m;
Whether the linearization image raw data of (F5) judging said M position is finishing touch linearization image raw data in the said row;
(F6) if judge that the linearization image raw data of said M position is not a finishing touch linearization image raw data in the said row, read the linearization image raw data of the M+1 position of said row;
(F7) judge whether the linearization image raw data of said M position is similar with the linearization image raw data of said M+1 position;
(F8) if judge that the linearization image raw data of said M position is similar with the linearization image raw data of said M+1 position, with the linearization image raw data removing of said M position and be reset to 0; And
(F9) read the linearization image raw data of M+1 position of said row, the execution in step of laying equal stress on (F4)-(F8).
13. system according to claim 12; It is characterized in that; In the said step (F2); When the absolute value of the difference of the linearization image raw data of the second last reciprocal described in image raw data of finishing touch linearization described in the said row and the said row during, judge that then the image of finishing touch linearization described in said row raw data is similar with said the second last reciprocal linearization image raw data less than one first threshold value.
14. system according to claim 12; It is characterized in that; In the said step (F7); When the absolute value of the difference of the linearization image raw data of the linearization image raw data of said M position and said M+1 position during less than one second threshold value, the linearization image raw data of then judging said M position is similar with the linearization image raw data of said M+1 position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210260561.6A CN102819369B (en) | 2012-07-26 | 2012-07-26 | Promote the method for the touch coordinate accuracy in computation of capacitance type multi-point touch-control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210260561.6A CN102819369B (en) | 2012-07-26 | 2012-07-26 | Promote the method for the touch coordinate accuracy in computation of capacitance type multi-point touch-control system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102819369A true CN102819369A (en) | 2012-12-12 |
| CN102819369B CN102819369B (en) | 2015-08-19 |
Family
ID=47303504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210260561.6A Active CN102819369B (en) | 2012-07-26 | 2012-07-26 | Promote the method for the touch coordinate accuracy in computation of capacitance type multi-point touch-control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102819369B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103019495A (en) * | 2012-12-26 | 2013-04-03 | 深圳贝特莱电子科技有限公司 | Method and device for noise control in capacitive touch screen |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2120135A1 (en) * | 2008-05-16 | 2009-11-18 | HTC Corporation | Method for filtering signals of touch sensitive device |
| CN101706698A (en) * | 2009-11-23 | 2010-05-12 | 深圳市汇顶科技有限公司 | Touch-sensitive scanning detection method and system, as well as capacitive touch sensor |
| CN101833406A (en) * | 2010-03-30 | 2010-09-15 | 福建华映显示科技有限公司 | Touch panel detection circuit |
| CN102138121A (en) * | 2009-06-29 | 2011-07-27 | 索尼公司 | Electrostatic capacitive type touch panel and display device equipped with a touch detection function |
| CN102207804A (en) * | 2010-03-31 | 2011-10-05 | 意法半导体亚太私人有限公司 | Capacitive sensing analog front end |
-
2012
- 2012-07-26 CN CN201210260561.6A patent/CN102819369B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2120135A1 (en) * | 2008-05-16 | 2009-11-18 | HTC Corporation | Method for filtering signals of touch sensitive device |
| CN102138121A (en) * | 2009-06-29 | 2011-07-27 | 索尼公司 | Electrostatic capacitive type touch panel and display device equipped with a touch detection function |
| CN101706698A (en) * | 2009-11-23 | 2010-05-12 | 深圳市汇顶科技有限公司 | Touch-sensitive scanning detection method and system, as well as capacitive touch sensor |
| CN101833406A (en) * | 2010-03-30 | 2010-09-15 | 福建华映显示科技有限公司 | Touch panel detection circuit |
| CN102207804A (en) * | 2010-03-31 | 2011-10-05 | 意法半导体亚太私人有限公司 | Capacitive sensing analog front end |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103019495A (en) * | 2012-12-26 | 2013-04-03 | 深圳贝特莱电子科技有限公司 | Method and device for noise control in capacitive touch screen |
| CN103019495B (en) * | 2012-12-26 | 2015-10-21 | 深圳贝特莱电子科技有限公司 | A kind of method for Noise measarement in capacitive touch screen and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102819369B (en) | 2015-08-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10282026B2 (en) | Measuring body capacitance effect in touch sensitive device | |
| US9170681B2 (en) | Noise reduction method and system of capacitive multi-touch panel | |
| CN102096498B (en) | Method and device for analyzing position | |
| CN102043557B (en) | Method and device of position detection | |
| CN102043508B (en) | Method and device for signal detection | |
| CN102043525B (en) | Method and apparatus for converting sensing information | |
| US20200142532A1 (en) | Suppressing noise in touch panels using a shield layer | |
| CN103324367A (en) | Touch sensing device and double sampling method thereof | |
| US20130234985A1 (en) | Driving frequency selection method for capacitive multi-touch system | |
| CN103019434A (en) | Touch screen driver and method for driving the same | |
| CN104750301A (en) | Touch sensing system | |
| US8836669B1 (en) | High resolution capacitance to code converter | |
| CN102522975B (en) | Adaptive-environmental touch key circuit and key touch detection method | |
| CN102981685A (en) | Touch screen apparatus and driving method thereof | |
| CN102622144A (en) | Demodulation method and system for low-power differential detection capacitive touch control | |
| CN104423765A (en) | Electronic device with touch sensor and driving method thereof | |
| US20140118297A1 (en) | Method for improving linearity of touch system coordinates | |
| CN104898907A (en) | Semiconductor device and electronic apparatus | |
| CN102662540A (en) | Driving frequency selection method for capacitive multipoint touch system | |
| CN106462310B (en) | The method of the touch point of touch chip and touch chip detection touch screen | |
| CN102135828A (en) | Method and device for signal detection | |
| US9513740B2 (en) | Chip architecture in improve the sensing latency time in projected capacitance touch | |
| CN102819369A (en) | Method for calculating accuracy of touch coordinate of capacitance improved type multi-point touch control system | |
| CN102043509B (en) | Method and apparatus for analyzing location | |
| US9195355B2 (en) | Method for increasing accuracy of touch coordinate calculation in a capacitive multi-touch system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |