CN102945110B - The noise filtering method of capacitance type touch-control panel and system - Google Patents

Abstract

The invention provides a kind of noise filtering method and system of capacitance touching control, wherein said system is used for a capacitance type touch-control panel, and it has N bar second conductor lines of M bar first conductor lines and the second direction arrangement arranged according to a first direction.One controller setting one first switch and one second switch, this M bar first conductor lines is connected in order to allow multiple drivers of a drive unit, multiple sensors of one sensing apparatus are connected to this N bar second conductor lines, in order to carry out first direction driving and second direction sensing, this controller more sets this first and second switch, this N bar second conductor lines is connected to allow the plurality of driver, and the plurality of sensor is connected to this M bar first conductor lines, in order to carry out second direction driving and first direction sensing, and then be the problem that noise spreads along sense line directional spreding caused by the touching of solution finger.

Description

The noise filtering method of capacitance type touch-control panel and system

Technical field

The present invention about the technical field of contact panel, espespecially a kind of noise filtering method of capacitance touching control and system.

Background technology

The know-why of contact panel is when finger or other medium contacts are to screen, according to different induction mode, and detecting voltage, electric current, sound wave or infrared ray etc., and then measure the coordinate position of touch point.Such as electric resistance touch-control panel is and utilizes upper and lower interelectrode potential difference (PD), detects touch point place in order to calculate compression point position.Capacitance type touch-control panel is the capacitance variations utilizing the electrostatical binding between the transparency electrode of arrangement and human body to produce, and detects its coordinate from produced curtage.

According to capacitance touching control know-why, it can be divided into surface-type capacitance touching control to sense (SurfaceCapacitive) and these two kinds of technology of projecting type capacitor touch-control sensing (ProjectedCapacitive).Though surface-type capacitive sensing technology framework simple structure, but not easily realize multi-point touch and more difficultly overcome electromagnetic interference (EMI) (ElectromagneticDisturbance, EMI) and the problem of news of making an uproar, make mostly now to develop towards projected capacitive touch detection technology.

Projecting type capacitor touch-control sensing (ProjectedCapacitive) technology can be divided into again self-induction capacitor type (Selfcapacitance) and Inductance and Capacitance type (Mutualcapacitance).Self-induction capacitor type refers to and produces capacitive coupling between touch control object and conductor lines, and the capacitance variations measuring conductor lines determines that touching occurs, and Inductance and Capacitance type is then when touching occurs, and can produce capacitive coupling phenomenon between contiguous two-layer conductor lines.

Known self-induction electric capacity (selfcapacitance) detection technology is each strip conductor line ground capacitance of sensing, judge whether that object is near capacitance type touch-control panel by the change of ground capacitance value, wherein, self-induction electric capacity or ground capacitance are not entity capacitance, and it is parasitism and the stray capacitance of each strip conductor line.Fig. 1 is the schematic diagram that known self-induction electric capacity (selfcapacitance) senses, it is in the cycle very first time, first driven the conductor lines of first direction by the driving of first direction and sensor 110, in order to the self-induction capacitor charging of the conductor lines to first direction.Again in the second time cycle, driving and sensor 110 detect the voltage in the conductor lines of first direction, and then obtain m data.Again in the 3rd time cycle, driven the conductor lines of second direction by the driving of second direction and sensor 120, in order to the self-induction capacitor charging of the conductor lines to second direction.Again in the 4th time cycle, driving and sensor 120 detect the voltage in the conductor lines of second direction, and then obtain n data.Therefore, m+n data can altogether be obtained.

Simultaneously known self-induction electric capacity (selfcapacitance) method for sensing in Fig. 1 is connected with driving circuit and sensing circuit in same conductor lines, after first conductor lines being driven, again same conductor lines is sensed to the variable quantity of its signal, to determine self-induction capacitance size.Its benefit is:

(1) data quantity is less, and the single image (image) of contact panel only has m+n document, saves hardware cost;

(2) untreated data of image (imagerawdata) obtain fast, therefore the time of sensing needed for touch points is less.Because all first direction conductor lines can sense (certainly also can sense one by one) simultaneously, and then the conductor lines all to second direction drives and senses simultaneously, the different directions conductor lines sensor operation of twice just can finish a picture frame, therefore data quantity is less, simultaneously also few a lot of in the time that sensing signal is transferred to needed for digital signal by analog signal by execution; And

(3) amount due to data process is less, so have lower power consumption.

But the corresponding shortcoming of self-induction electric capacity (selfcapacitance) method for sensing is then:

(1) when contact panel there being suspension joint conductor (as water droplet, oil stain etc.), touch points is easily caused to judge by accident; And

(2) when contact panel there being multi-point touch simultaneously, have the phenomenon of ghost, cause self-induction electric capacity (selfcapacitance) method for sensing to be difficult to support the application of multi-point touch.

The method system sensing mutual induction electric capacity (mutualcapacitance that another capacitance type touch-control panel drives, Cm) size variation, to have judged whether that object is near contact panel, similarly, mutual induction electric capacity (Cm) is entity capacitance not, and it is mutual induction electric capacity (Cm) between the conductor lines 230 of first direction and the conductor lines 240 of second direction.Fig. 2 is the schematic diagram that known mutual induction electric capacity (Cm) senses, and as shown in Figure 2, driver 210 is configured on first direction (Y), and sensor 220 is configured in second direction (X).The conductor lines 230 of the first direction that contact panel is connected with driver 210 is also called driver circuit (drivingline), and the conductor lines 240 of the second direction be connected with sensor 220 is also called sense line (sensingline).

Before very first time cycle T 1 during the semiperiod, driven by the conductor lines 230 of driver 210 pairs of first directions, it uses voltage Vy_1 to charge to mutual induction electric capacity (Cm) 250, and when the very first time in the 1 later half cycle of cycle T, all sensors 220 sense the voltage (Vo_1 in the conductor lines 240 of all second directions, Vo_2, ..., Vo_n), in order to obtain n data, after m drive cycle, m × n data can be obtained.

The advantage of mutual induction electric capacity (Cm) method for sensing is:

(1) the signal different directions of suspension joint conductor and earth conductor, therefore can determine whether that human body is touched very easily; And

(2) owing to there being the true coordinate of each point, when multiple spot touches simultaneously, can tell each and put real position, mutual induction electric capacity (Cm) method for sensing is easier to the application supporting multi-point touch.

Its shortcoming is then:

(1) the untreated data of single image (imagerawdata) data quantity is nxm, and it is much larger than the data quantity of self-induction electric capacity (selfcapacitance) method for sensing;

(2) direction must be selected, scan one by one, such as: when first direction (Y) there being 20 strip conductor line, then need the action doing 20 sensings, just can obtain a untreated data of complete image (imagerawdata).Simultaneously because data quantity is large, then increase many in the time by sensing signal is transferred to needed for digital signal by analog signal that performs; And

(3) because data quantity is much larger, the power consumption of data process also can rise thereupon.

No matter be self-induction electric capacity (selfcapacitance) method for sensing or mutual induction electric capacity (mutualcapacitance, Cm) method for sensing, when it carries out touch sensing, the touching data obtained easily is subject to the impact of noise, and make the judgement of the touch position of capacitance type touch-control panel easily cause error, and then affect capacitance type touch-control panel sensing resolution.

For solving noise problem, known technology United States Patent (USP) US7,643, in No. 011 bulletin, the excitation waveform (stimuluswave) of three groups of different driving frequencies (driving-frequency) is first exported in mutual capacitance (Mutualcapacitance) mode, and respond to acquisition obtain three groups touching image (touchimage), the minimum touching image of noise is found out again by three groups of touchings image (touchimage), and be used as frequency of operation with the driving frequency corresponding with it, in order to acquisition touching image, and then calculate touch coordinate.

But, mutual induction electric capacity (mutualcapacitance, Cm) method for sensing is when practical application, when contact panel is touched, on touch location contain the signal of sense line (sensingline) except changing, also can be affected by the noise of human body, and then cause also may not being mistaken for finger touch by the position of finger touch.

Fig. 3 is the schematic diagram of noise on a known contact panel.When finger touch contact panel A place, the noise of touch can be produced, and affect sense line (sensingline) signal that touch location contains.That is, when period of time T x, driven by driver 210 pairs of driver circuits (drivingline), it uses voltage Vy_1 to charge to mutual induction electric capacity (Cm) 250, now, the voltage that sensor 220 senses includes voltage because producing during finger touch contact panel A place and the voltage of noise because producing during finger touch contact panel A place.Now, the voltage that sensor 220 senses, owing to comprising the voltage because producing during finger touch contact panel A place, therefore has certain resistivity to noise.

And as period of time T y, the voltage that sensor 220 senses include because of during finger touch contact panel A place produce the voltage of noise.Now, the voltage that sensor 220 senses is not owing to comprising the voltage because producing during finger touch contact panel B place, therefore the touching data obtained at B place is easily subject to the impact of noise, and make the touch position of capacitance type touch-control panel easily cause error, and then affect the sensing resolution of capacitance type touch-control panel, that is the noise caused by finger touching easily spreads along sense line (sensingline) directional spreding.

Therefore, the space that is still improved of the noise filtering technology of known capacitance formula contact panel.

Summary of the invention

Object of the present invention is mainly providing a kind of noise filtering method and system of capacitance touching control, to solve the problem that finger touching noise causes sense line (sensingline) directional spreding to spread, with filtering noise information and the sensing resolution promoting capacitance type touch-control panel.

According to a characteristic of the present invention, the present invention proposes a kind of noise filtering appts of capacitance type touch-control panel, it is for a capacitance type touch-control panel, this capacitance type touch-control panel has according to M bar first conductor lines of a first direction arrangement and N bar second conductor lines according to a second direction arrangement, wherein, M and N is respectively the integer being greater than 1, and this noise filtering appts comprises: a drive unit, there is multiple driver, drive signal in order to touch-control when producing touch-control sensing; Whether one sensing apparatus, has multiple sensor, drives signal according to this touch-control, have an external object close, and produce touch-control sensing signal in order to induction; One first switch, is connected to this drive unit, this sensing apparatus and this capacitance type touch-control panel, in order to multiple drivers of this drive unit, multiple sensors of this sensing apparatus are electrically connected to this capacitance type touch-control panel; One second switch, is connected to this drive unit, this sensing apparatus and this capacitance type touch-control panel, in order to multiple drivers of this drive unit, multiple sensors of this sensing apparatus are electrically connected to this capacitance type touch-control panel; And a controller, be connected to this drive unit, this sensing apparatus, this first switch and this second switch, carry out a first direction driving and second direction sensing and set this second switch carrying out a second direction driving and first direction sensing in order to set this first switch.

According to another characteristic of the present invention, the present invention proposes a kind of noise filtering method of capacitance type touch-control panel, it is for a capacitance type touch-control panel, this capacitance type touch-control panel has according to M bar first conductor lines of a first direction arrangement and N bar second conductor lines according to a second direction arrangement, wherein, M and N is respectively the integer being greater than 1, and this noise filtering method comprises: (A) captures an initialization sensing image data of this capacitance type touch-control panel; (B) in very first time interval, controller setting one first switch, one second switch, to carry out a first direction driving and second direction sensing, and obtains one first sensing image data; (C) in second time interval, this controller sets this first switch, this second switch, to carry out a second direction driving and first direction sensing, and obtains one second sensing image data; And (D) this controller is according to this initialization sensing image data, this first sensing image data, and this second sensing image data, to determine the sensing image data of this capacitance type touch-control panel.

When being touched for known mutual induction electric capacity (Cm) method for sensing, sense line (sensingline) is by the impact of noise, embodiment provided by the invention is premised on the structure not changing contact panel, utilize the function mode exchanging drive unit and sensing apparatus, reach the sensing resolution of filtering noise information and lifting capacitance type touch-control panel.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of known self-induction capacitance sensing;

Fig. 2 is the schematic diagram of known mutual induction capacitance sensing;

Fig. 3 is the schematic diagram of noise on a known contact panel;

Fig. 4 is capacitance type multi-point touch-control of the present invention is the calcspar of uniting;

Fig. 5 is capacitance type multi-point touch-control of the present invention is another schematic diagram that system operates;

Fig. 6 is the schematic diagram that the present invention operated in second time interval;

Fig. 7 is the schematic diagram of the noise of the present invention when the second time interval running;

Fig. 8 is the schematic diagram that this controller of the present invention determines the sensing image data of capacitance type touch-control panel;

Fig. 9 is the process flow diagram of the noise filtering method of capacitance type touch-control panel of the present invention.

Embodiment

The noise filtering appts of capacitance type touch-control panel of the present invention is used for a capacitance type touch-control panel.Fig. 4 is the calcspar of the noise filtering appts 400 of this capacitance type touch-control panel, and the noise filtering appts 400 of this capacitance type touch-control panel comprises capacitance type touch-control panel 410, drive unit 420, sensing apparatus 430,1 first switch 440,1 second switch 450 and a controller 460.

This capacitance type touch-control panel 410 has M bar first conductor lines 411 and N bar second conductor lines 413, M and N is respectively the integer being greater than 1, this M bar first conductor lines 411 arranges according to a first direction (Y), N bar second conductor lines 413 arranges according to a second direction (X), wherein, this first direction is vertical with second direction.

This drive unit 420 has multiple driver 421, drives signal in order to touch-control when producing touch-control sensing.

Whether this sensing apparatus 430 has multiple sensor 431, and the plurality of sensor 431 drives signal according to this touch-control, have an external object close, and produce touch-control sensing signal in order to induction.

This first switch 440 is connected to this drive unit 420, this sensing apparatus 430 and this capacitance type touch-control panel 410, so that multiple drivers 421 of this drive unit 420, multiple sensors 431 of this sensing apparatus 430 are electrically connected to this capacitance type touch-control panel 410.

This second switch 450 is connected to this drive unit 420, this sensing apparatus 430 and this capacitance type touch-control panel 410, so that multiple drivers 421 of this drive unit 420, multiple sensors 431 of this sensing apparatus 430 are electrically connected to this capacitance type touch-control panel 410.

This controller 460 is connected to this drive unit 420, this sensing apparatus 430, this first switch 440 and this second switch 450, to control the electrical connection of multiple drivers 421 of this drive unit 420, multiple sensors 431 of this sensing apparatus 430 and this capacitance type touch-control panel 410.

This controller 460 sets this first switch 440 and this second switch 450, and in order to carry out a first direction driving and second direction sensing respectively, and a second direction drives and first direction sensing.

So-called first direction drives and second direction sensing, can see Fig. 3, multiple drivers 421 of this drive unit 420 sequentially export along first direction (Y) and drive signal, and multiple sensors 431 of this sensing apparatus 430 also can receive sensor signal along second direction (X) simultaneously.Multiple sensors 431 of this sensing apparatus 430 can along second direction (X) received in sequence sensor signal.

As shown in Figure 4, when very first time interval, this controller 460 sets this first switch 440, in order to M bar first conductor lines 411 allowing multiple drivers 421 of this drive unit 420 be electrically connected to this capacitance type touch-control panel 410, set this second switch 450, in order to N bar second conductor lines 413 allowing multiple sensors 431 of this sensing apparatus 430 be electrically connected to this capacitance type touch-control panel 410, and then carry out this first direction driving and second direction sensing.

Fig. 5 is another schematic diagram of this capacitance type multi-point touch-control system 400 running, when second time interval, this controller 460 sets this first switch 440, in order to N bar second conductor lines 413 allowing multiple drivers 421 of this drive unit 420 be electrically connected to this capacitance type touch-control panel 410, set this second switch 450, in order to M bar first conductor lines 411 allowing multiple sensors 431 of this sensing apparatus 430 be electrically connected to this capacitance type touch-control panel 410, and then carry out this second direction driving and first direction sensing.

The present invention first uses this first direction as shown in Figure 4 to drive and second direction sensing, can obtain the one first sensing image data at this very first time interval by this.Now when second time interval, the present invention utilizes this first switch 440 and this second switch 450, in order to exchange the position of this drive unit 420 and this sensing apparatus 430, as shown in Figure 5, itself and Fig. 4 essential difference are that the sensing circuit of Fig. 4 switches to driving circuit, and driving circuit switches to sensing circuit.That is, be connected to the drive unit 420 of M bar first conductor lines 411 of this capacitance type touch-control panel 410 in Fig. 4, be then connected to N bar second conductor lines 413 of this capacitance type touch-control panel 410 in Figure 5.Be connected to this sensing apparatus 430 of N bar second conductor lines 413 of this capacitance type touch-control panel 410 in Fig. 4, be then connected to M bar first conductor lines 411 of this capacitance type touch-control panel 410 in Figure 5.

Fig. 6 is the schematic diagram that the present invention operated in second time interval.Its function mode is equally produced by drive unit 420 specifically to drive signal, and drive signal to enter contact panel via the circuit of this capacitance type touch-control panel 410, this sensing apparatus 430 receives sensing signal and variable quantity.When finger touch is on contact panel, this sensing apparatus 430 can receive the change of sensing signal.

Fig. 7 is the schematic diagram of the noise of the present invention when the second time interval running, the difference of itself and Fig. 3 is that being affected by human body noise in Fig. 3 is along the Y direction, and be along the X direction by the impact of human body noise in Fig. 7, and obtain the one second sensing image data in this second time interval.

So-called second direction drives and first direction sensing, can see Fig. 7, multiple drivers 421 of this drive unit 420 sequentially export along second direction (X) and drive signal, and multiple sensors 431 of this sensing apparatus 430 also can receive sensor signal along first direction (Y) simultaneously.Multiple sensors 431 of this sensing apparatus 430 can along first direction (Y) received in sequence sensor signal.

By shown in Fig. 3 and Fig. 7, the noise image capturing range difference touching and produce can being found out, so by comparing this first sensing image data and this second sensing image data, and then real touch location can be judged.

This controller 460 has a temporary storage location 461, and this temporary storage location 461 has one first and stores block 465,1 second storage block 466 and one the 3rd storage block 467.

This first storage block 465 has initialization sensing image data during this capacitance type touch-control panel initialization, this the second storage block 466 has this first sensing image data at this very first time interval, and the 3rd stores this second sensing image data that block 467 has this second time interval.Wherein, this initialization sensing image data, this first sensing image data and this second sensing image data are all M × N number of data.

This controller 460 will carry out this second direction driving and first direction sensing institute acquisition data in order to perform transposition (transpose) computing during second time interval, and then obtains this second sensing image data.

This controller 460 according to this initialization sensing image data, this first sensing image data and this second sensing image data, in order to determine the sensing image data of this capacitance type touch-control panel 410.When the absolute value of the difference of a data of this first sensing image data and corresponding position one data of this initialization sensing image data is less than or equal to the absolute value of the difference of corresponding position one data of this second sensing image data and this data of this initialization sensing image data, the sensing image data that this controller sets this capacitance type touch-control panel corresponding position is this data of this first sensing image data, when the absolute value of the difference of this data of this first sensing image data and this data of corresponding position of this initialization sensing image data is greater than the absolute value of the difference of this data of corresponding position of this second sensing image data and this data of this initialization sensing image data, the sensing image data that this controller sets this capacitance type touch-control panel corresponding position is this data of this second sensing image data.

That is, this controller 460 according to following calculation expression, to determine the sensing image data of this capacitance type touch-control panel 410:

$\mathrm{Csigo}(x,y)=$

$\left\{\begin{array}{c}\mathrm{Csig}\_1(x,y),\mathrm{when}\left|\right|\mathrm{Csig}\_1(x,y)-\mathrm{Csig}\_b(x,y)\left|\right|\≤\left|\right|\mathrm{Csig}\_2(x,y)-\mathrm{Csig}\_b(x,y)\left|\right|\\ \mathrm{Csig}\_2(x,y),\mathrm{when}\left|\right|\mathrm{Csig}\_1(x,y)-\mathrm{Csig}\_b(x,y)\left|\right|>\left|\right|\mathrm{Csig}\_2(x,y)-\mathrm{Csig}\_b(x,y)\left|\right|\end{array}\right.,$

In the middle of, Csig_1 (x, y) be a data of this first sensing image data, Csig_2 (x, y) is a data of this second sensing image data, Csig_b (x, y) be a data of this initialization sensing image data, the sensing image data that Csig_o (x, y) is this capacitance type touch-control panel, 0≤x≤M-1,0≤y≤N-1.

This controller 460 of Fig. 8 system the present invention determines the schematic diagram of the sensing image data of this capacitance type touch-control panel 410.When very first time interval, carrying out this first direction (Y) drives second direction to sense (X), therefore noise easily distributes along the Y direction, therefore B point place easily affects by noise, when second time interval, carrying out this second direction (X) drives first direction (Y) to sense, and therefore noise easily distributes along the X direction, therefore B point place does not then have noise to affect.In like manner, when very first time interval, carrying out this first direction (Y) drives second direction (X) to sense, noise easily distributes but not X-direction distribution along the Y direction, therefore C point place does not then have noise to affect, and when second time interval, carrying out this second direction (X) drives first direction to sense (Y), therefore noise easily distributes along the X direction, therefore C point place easily affects by noise.

From above-mentioned calculation expression, this first sensing image data and this second sensing image data system and this initialization sensing image data get less value after subtracting each other.Such as, in Fig. 8, its initialization sensing image data of A, B, C, D tetra-points is $\left[\begin{array}{cc}A& C\\ B& D\end{array}\right]=\left[\begin{array}{cc}30& 30\\ 30& 30\end{array}\right],$ First sensing image data is $\left[\begin{array}{cc}A& C\\ B& D\end{array}\right]=\left[\begin{array}{cc}90& 40\\ 79& 10\end{array}\right],$ Second sensing image data is $\left[\begin{array}{cc}A& C\\ B& D\end{array}\right]=\left[\begin{array}{cc}100& 89\\ 20& 30\end{array}\right],$ That is carry out this first direction (Y) drive second direction sense (X), therefore noise easily distributes along the Y direction, though B point place do not point touching affect by noise, therefore its value is promoted to 79 by 30.Carrying out this second direction (X) drives first direction (Y) to sense, and therefore noise easily distributes along the X direction, and therefore B point place does not then have noise to affect, and its value is only changed to 20 by 30.In like manner, carrying out this first direction (Y) drives second direction to sense (X), because noise distributes along the Y direction, therefore C point place does not then have noise to affect, its value is only changed to 40 by 30, and carry out this second direction (X) and drive first direction (Y) to sense, therefore noise easily distributes along the X direction, though C point place does not point touching but affects by noise, therefore its value is promoted to 89 by 30.So via above-mentioned calculation expression, the sensing image data of this capacitance type touch-control panel is $\left[\begin{array}{cc}A& C\\ B& D\end{array}\right]=\left[\begin{array}{cc}90& 40\\ 20& 30\end{array}\right].$ By the sensing image data of this capacitance type touch-control panel, this controller 460 easily judges that A point place produces touching, simultaneously via the technology of the present invention, can eliminate the impact because of finger touch generation noise.

In the present embodiment, M and N is 7, ripely can change M and N into other numerical value according to instructions of the present invention in this operator, and the numerical value of M also can be not equal to the numerical value of N, and this can complete according to instructions of the present invention in this operator easily for ripe.

Fig. 9 is the process flow diagram of the noise filtering method of capacitance type touch-control panel of the present invention, it is for capacitance type touch-control panel 410 as the aforementioned, this capacitance type touch-control panel 410 has orthogonal M bar first conductor lines 411 and N bar second conductor lines 413, M and N is respectively the integer being greater than 1, this M bar first conductor lines is according to a first direction arrangement, and N bar second conductor lines is according to a second direction arrangement.

First this noise filtering method captures an initialization sensing image data of this capacitance type touch-control panel 410 in step (A);

In step (B), in very first time interval, this controller 460 sets this first switch 440, this second switch 450, in order to carry out a first direction driving and second direction sensing, and then the one first sensing image data of acquisition.

In step (B), this controller 460 sets this first switch 440, with M bar first conductor lines 411 allowing multiple drivers 421 of this drive unit 420 be electrically connected to this capacitance type touch-control panel 410, set this second switch 450, with N bar second conductor lines 413 allowing multiple sensors 431 of this sensing apparatus 430 be electrically connected to this capacitance type touch-control panel 410, to carry out this first direction driving and second direction sensing.

In step (C), in second time interval, this controller 460 sets this first switch 440, this second switch 450, in order to carry out a second direction driving and first direction sensing, and then the one second sensing image data of acquisition.

In step (C), this controller 460 sets this first switch 440, with N bar second conductor lines 413 allowing multiple drivers 421 of this drive unit 420 be electrically connected to this capacitance type touch-control panel 410, set this second switch 450, with M bar first conductor lines 411 allowing multiple sensors 431 of this sensing apparatus 430 be electrically connected to this capacitance type touch-control panel 410, to carry out this second direction driving and first direction sensing.Wherein, this initialization sensing image data, this first sensing image data and this second sensing image data are all M × N number of data.

In step (D), this controller 460 according to this initialization sensing image data, this first sensing image data and this second sensing image data, in order to determine the sensing image data of this capacitance type touch-control panel.When the absolute value of the difference of a data of this first sensing image data and corresponding position one data of this initialization sensing image data is less than or equal to the absolute value of the difference of corresponding position one data of this second sensing image data and this data of this initialization sensing image data, the sensing image data that this controller sets this capacitance type touch-control panel corresponding position is this data of this first sensing image data, when the absolute value of the difference of this data of this first sensing image data and this data of corresponding position of this initialization sensing image data is greater than the absolute value of the difference of this data of corresponding position of this second sensing image data and this data of this initialization sensing image data, the sensing image data that this controller sets this capacitance type touch-control panel corresponding position is this data of this second sensing image data.

That is via following calculation expression, to determine the sensing image data of this capacitance type touch-control panel 410:

$\mathrm{Csigo}(x,y)=$

$\left\{\begin{array}{c}\mathrm{Csig}\_1(x,y),\mathrm{when}\left|\right|\mathrm{Csig}\_1(x,y)-\mathrm{Csig}\_b(x,y)\left|\right|\≤\left|\right|\mathrm{Csig}\_2(x,y)-\mathrm{Csig}\_b(x,y)\left|\right|\\ \mathrm{Csig}\_2(x,y),\mathrm{when}\left|\right|\mathrm{Csig}\_1(x,y)-\mathrm{Csig}\_b(x,y)\left|\right|>\left|\right|\mathrm{Csig}\_2(x,y)-\mathrm{Csig}\_b(x,y)\left|\right|\end{array}\right.,$

In the middle of, Csig_1 (x, y) be a data of this first sensing image data, Csig_2 (x, y) is a data of this second sensing image data, Csig_b (x, y) be a data of this initialization sensing image data, the sensing image data that Csig_o (x, y) is this capacitance type touch-control panel, 0≤x≤M-1,0≤y≤N-1.

Due in existing document, for the noise caused by finger touching easily along the problem of sense line (sensingline) directional spreding diffusion, can run into when being applied to capacitance type touch-control panel, therefore known technology does not have relevant technology to touch the solution of noise sense line (sensingline) directional spreding diffusion to solve finger.The present invention utilizes and exchanges drive unit 420 and the function mode of sensing apparatus 430, effectively can tell real touch location on contact panel 410, such as, A in Fig. 8 and the errors present affected by noise, such as, B, C in Fig. 8.

The present invention improves known mutual induction electric capacity (Cm) method for sensing when being touched, sense line (sensingline) is by the impact of noise, premised on the structure simultaneously not changing contact panel 410, utilize and exchange drive unit 420 and the function mode of sensing apparatus 430, reach the sensing resolution of filtering noise information and lifting capacitance type touch-control panel.

From the above, the present invention, no matter with regard to object, means and effect, it is totally different in the feature of known technology all showing, has practical value.Only it should be noted, above-mentioned many embodiments are citing for convenience of explanation only, and the interest field that the present invention advocates from should being as the criterion with described in claims, but not is only limitted to above-described embodiment.

Claims (12)

1. the noise filtering appts for capacitance type touch-control panel, this capacitance type touch-control panel has according to M bar first conductor lines of a first direction arrangement and N bar second conductor lines according to a second direction arrangement, wherein, M and N is respectively the integer being greater than 1, and this noise filtering appts comprises:

One drive unit, has multiple driver, drives signal in order to touch-control when producing touch-control sensing;

Whether one sensing apparatus, has multiple sensor, drives signal according to this touch-control, have an external object close, and produce touch-control sensing signal in order to induction;

One first switch, is connected to this drive unit, this sensing apparatus and this capacitance type touch-control panel, in order to multiple drivers of this drive unit, multiple sensors of this sensing apparatus are electrically connected to this capacitance type touch-control panel;

One second switch, is connected to this drive unit, this sensing apparatus and this capacitance type touch-control panel, in order to multiple drivers of this drive unit, multiple sensors of this sensing apparatus are electrically connected to this capacitance type touch-control panel; And

One controller, be connected to this drive unit, this sensing apparatus, this first switch and this second switch, carry out a first direction driving and second direction sensing and set this second switch carrying out a second direction driving and first direction sensing in order to set this first switch;

When a very first time interval, this controller sets this first switch, this M bar first conductor lines in this capacitance type touch-control panel is electrically connected in order to allow multiple drivers of this drive unit, and set this second switch, this N bar second conductor lines in this capacitance type touch-control panel is electrically connected in order to allow multiple sensors of this sensing apparatus, and then carry out this first direction driving and second direction sensing, and produce one first sensing image data;

When second time interval, this controller sets this first switch, this N bar second conductor lines in this capacitance type touch-control panel is electrically connected in order to allow multiple drivers of this drive unit, and set this second switch, this M bar first conductor lines in this capacitance type touch-control panel is electrically connected in order to allow multiple sensors of this sensing apparatus, and then carry out this second direction driving and first direction sensing, and produce one second sensing image data;

This controller has a temporary storage location, and this temporary storage location has one first and stores block;

This first storage block has initialization sensing image data during this capacitance type touch-control panel initialization,

When the absolute value of the difference of a data of this first sensing image data and corresponding position one data of this initialization sensing image data is less than or equal to the absolute value of the difference of corresponding position one data of this second sensing image data and this data of this initialization sensing image data, the sensing image data that this controller sets this capacitance type touch-control panel corresponding position is this data of this first sensing image data, and, when the absolute value of the difference of this data of this first sensing image data and this data of corresponding position of this initialization sensing image data is greater than the absolute value of the difference of this data of corresponding position of this second sensing image data and this data of this initialization sensing image data, the sensing image data that this controller sets this capacitance type touch-control panel corresponding position is this data of this second sensing image data.

2. the noise filtering appts of capacitance type touch-control panel as claimed in claim 1, wherein, this first direction is vertical with second direction.

3. the noise filtering appts of capacitance type touch-control panel as claimed in claim 1, wherein, this temporary storage location also has one second and stores block, and one the 3rd stores block.

4. the noise filtering appts of capacitance type touch-control panel as claimed in claim 3, wherein, this the second storage block has this first sensing image data, and the 3rd store block have this second sensing image data, wherein, this initialization sensing image data, this first sensing image data, and this second sensing image data is all M × N number of data.

5. the noise filtering appts of capacitance type touch-control panel as claimed in claim 1, wherein, this controller in order to will carry out this second direction driving and first direction sensing institute acquisition data execution transpose operation during this second time interval, and then obtains this second sensing image data.

6. the noise filtering appts of capacitance type touch-control panel as claimed in claim 4, wherein, this controller according to this initialization sensing image data, this first sensing image data and this second sensing image data, in order to determine the sensing image data of this capacitance type touch-control panel.

7. the noise filtering appts of capacitance type touch-control panel as claimed in claim 6, wherein, this controller according to following calculation expression, to determine the sensing image data of this capacitance type touch-control panel:

$\begin{array}{c}Csig\_o(x,y)=\\ \left\{\begin{array}{c}Csig\_1(x,y),when\left|\right|Csig\_1(x,y)-Csig\_b(x,y)\left|\right|\≤\left|\right|Csig\_2(x,y)-Csig\_b(x,y)\left|\right|\\ Csig\_2(x,y),when\left|\right|Csig\_1(x,y)-Csig\_b(x,y)\left|\right|>\left|\right|Csig\_2(x,y)-Csig\_b(x,y)\left|\right|\end{array}\right.\end{array},$

In the middle of, Csig_1 (x, y) be a data of this first sensing image data, Csig_2 (x, y) be a data of this second sensing image data, Csig_b (x, y) be a data of this initialization sensing image data, the sensing image data that Csig_o (x, y) is this capacitance type touch-control panel, 0≤x≤M-1,0≤y≤N-1, wherein x represents xth the first conductor lines according to a first direction arrangement, and y represents y the second conductor lines according to a second direction arrangement, wherein x, y are integer.

8. the noise filtering method for capacitance type touch-control panel, it is for a capacitance type touch-control panel, this capacitance type touch-control panel has according to M bar first conductor lines of a first direction arrangement and N bar second conductor lines according to a second direction arrangement, wherein, M and N is respectively the integer being greater than 1, and this noise filtering method comprises:

(A) an initialization sensing image data of this capacitance type touch-control panel is captured;

(B) in very first time interval, controller setting one first switch, one second switch, to carry out a first direction driving and second direction sensing, and obtains one first sensing image data;

(C) in second time interval, this controller sets this first switch, this second switch, to carry out a second direction driving and first direction sensing, and obtains one second sensing image data; And

(D) this controller is according to this initialization sensing image data, this first sensing image data, and this second sensing image data, to determine the sensing image data of this capacitance type touch-control panel;

When the absolute value of the difference of a data of this first sensing image data and corresponding position one data of this initialization sensing image data is less than or equal to the absolute value of the difference of corresponding position one data of this second sensing image data and this data of this initialization sensing image data, the sensing image data that this controller sets this capacitance type touch-control panel corresponding position is this data of this first sensing image data, otherwise the sensing image data that this controller sets this capacitance type touch-control panel corresponding position is this data of this second sensing image data.

9. noise filtering method as claimed in claim 8, wherein, in step (B), this controller setting one first switch, multiple drivers of a drive unit are allowed to be electrically connected to this M bar first conductor lines in this capacitance type touch-control panel by this first switch, and setting one second switch, be electrically connected to this N bar second conductor lines in this capacitance type touch-control panel by the second switch to allow multiple sensors of a sensing apparatus, and then carry out this first direction driving and second direction sensing.

10. noise filtering method as claimed in claim 9, wherein, in step (C), this controller sets this first switch, multiple drivers of this drive unit are allowed to be electrically connected to this N bar second conductor lines in this capacitance type touch-control panel by this first switch, and set this second switch, allow multiple sensors of this sensing apparatus be electrically connected to this M bar first conductor lines in this capacitance type touch-control panel by this second switch, and then carry out this second direction driving and first direction sensing.

11. noise filtering methods as claimed in claim 8, wherein, this initialization sensing image data, this first sensing image data and this second sensing image data are M × N number of data.

12. noise filtering methods as claimed in claim 10, wherein, this controller according to following calculation expression, to determine the sensing image data of this capacitance type touch-control panel:

$\begin{array}{c}Csig\_o(x,y)=\\ \left\{\begin{array}{c}Csig\_1(x,y),when\left|\right|Csig\_1(x,y)-Csig\_b(x,y)\left|\right|\≤\left|\right|Csig\_2(x,y)-Csig\_b(x,y)\left|\right|\\ Csig\_2(x,y),when\left|\right|Csig\_1(x,y)-Csig\_b(x,y)\left|\right|>\left|\right|Csig\_2(x,y)-Csig\_b(x,y)\left|\right|\end{array}\right.\end{array},$

In the middle of, Csig_1 (x, y) be a data of this first sensing image data, Csig_2 (x, y) is a data of this second sensing image data, Csig_b (x, y) be a data of this initialization sensing image data, the sensing image data that Csig_o (x, y) is this capacitance type touch-control panel, 0≤x≤M-1,0≤y≤N-1.