CN102968238A - Method for improving linearity of touch coordinate trajectory - Google Patents
Method for improving linearity of touch coordinate trajectory Download PDFInfo
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- CN102968238A CN102968238A CN2012105086758A CN201210508675A CN102968238A CN 102968238 A CN102968238 A CN 102968238A CN 2012105086758 A CN2012105086758 A CN 2012105086758A CN 201210508675 A CN201210508675 A CN 201210508675A CN 102968238 A CN102968238 A CN 102968238A
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Abstract
The invention provides a method for improving the linearity of a touch coordinate trajectory. The method comprises the following steps: reading unprocessed two-dimensional data of a capacitive touch panel, and then reading a pixel of the unprocessed two-dimensional data and adjacent domains of the pixel; judging whether a pixel value of the pixel is larger than a critical value or not, and judging whether the pixel values of the adjacent domains are larger than the critical value or not if the pixel value of the pixel is not larger than the critical value; setting the pixel value of the pixel as a first set value if none of the pixel values of the adjacent domains is larger than the critical value; and retaining the pixel value of the pixel if at least one of the pixel values of the adjacent domains is larger than the critical value, so as to increase the linearity of the unprocessed two-dimensional data, and further protect the two-dimensional data from noise interference.
Description
Technical field
The present invention relates to the technical field of contact panel, especially refer to a kind of method that improves the touch-control Grid Track linearity.
Background technology
The know-why of contact panel is when finger or other medium contact during to screen, according to different induction modes, detects voltage, electric current, sound wave or infrared ray etc., and then measures the coordinate position of touch point.For example electric resistance touch-control panel is and utilizes upper and lower interelectrode potential difference (PD), with calculating compression point position, and then detects the touch point place.Capacitance type touch-control panel is to utilize the transparency electrode of arrangement and the capacitance variations that the electrostatical binding between the human body produces, and detects its coordinate from the curtage that produces.
Inductance and Capacitance type (Mutual capacitance) touch detection is a kind of of projecting type capacitor touch-control sensing (ProjectedCapacitive) technology.When touching occured, Inductance and Capacitance type (Mutual capacitance) touch detection can produce the capacitive coupling phenomenon between contiguous two-layer conductor lines.
And the method that Inductance and Capacitance type (Mutual capacitance) contact panel drives is the size variation of sensing Inductance and Capacitance (mutualcapacitance, Cm), to have judged whether that object is near contact panel.Mutual induction electric capacity (Cm) is not entity capacitance, and it is Inductance and Capacitance (Cm) between the conductor lines of the conductor lines of first direction and second direction.Fig. 1 is the synoptic diagram of existing Inductance and Capacitance (Cm) sensing, as shown in Figure 1, driver 110 is disposed on the first direction (Y), sensor 120 is disposed on the second direction (X), in the very first time cycle T during 1 front semiperiod, conductor lines 130 by 110 pairs of first directions of driver drives, use voltage Vy_1 to mutual induction electric capacity (Cm) 140 chargings, in the very first time cycle T during 1 later half cycle, the voltage (Vo_1 on the conductor lines 150 of all the sensors 120 all second directions of sensing, Vo_2,, Vo_n), to obtain n data, through (Vy_1 behind m the drive cycle ... Vy_m), can obtain m * n data.
The advantage of mutual induction electric capacity (Cm) method for sensing is:
(1) sense of suspension joint conductor and earth conductor is different, so can determine whether very easily the human body touching; And
(2) owing to have the true coordinate of each point, when multiple spot is touched simultaneously, can tell the actual position of each point, mutual induction electric capacity (Cm) method for sensing is easier to support the application of multi-point touch.
The specific capacitor contact panel but Inductance and Capacitance type (Mutual capacitance) technology must be arranged in pairs or groups, driving and scanning detecting by X, Y two-dimensional space on the panel, obtain the capacitance touching control panel two-dimentional voltage variety relevant with electric capacity, these voltage varieties are called untreatment data (Raw Data).And these untreatment datas (Raw Data) may comprise the variable quantity that the impacts such as touching and neighbourhood noise cause.
These untreatment datas (Raw Data) need through some algorithms and interior difference method, with the calculating touch coordinate, and then judge the touch position of user on contact panel.In the prior art, for the processing mode of these untreatment datas (RawData), be to set a critical value (Threshold) to determine whether effectively to touch data mostly.Fig. 2 is the synoptic diagram that prior art is judged position of touch.
As shown in Figure 2, for judging the synoptic diagram of position of touch in the prior art, first width of cloth is the position of touch of finger on panel, second width of cloth is corresponding two-dimentional untreatment data, the 3rd width of cloth is judged for carry out the touch area according to critical value, its with untreatment data (Raw Data) whether greater than critical value (Threshold), judge the touch area, namely when the value of untreatment data (Raw Data) during greater than critical setting value 80, judge that this position data is effective touch area, in other words, namely when touching the sense value above critical setting value 80, be effective touch, otherwise be considered as noise.
Yet this prior art but can cause serious problems, and namely whether good the impact of linearity, the sense value of untreatment data (Raw Data) electrode pattern (Pattern) that is subject to capacitance touching control panel be very large.Fig. 3 is prior art shown nonlinear one simple synoptic diagram, when the electrode pattern characteristic of capacitance touching control panel is not good, may cause touch track sense value not good, break or become stair-stepping nonlinear situation, be to touch the not good situation of sense value such as the first width of cloth figure among Fig. 3, the second width of cloth figure is the situation that short-term occurs.
In addition, the electrode pattern of capacitance touching control panel (Pattern) design is very large to the value effect of untreatment data (Raw Data).Fig. 4 A to Fig. 4 C is that electrode pattern is to the synoptic diagram of the value effect of untreatment data, the first width of cloth figure is that the untreatment data that position of touch is corresponding when turning left touch-control from the right side changes among every width of cloth figure, and the second width of cloth figure is that the finger sense wire that position of touch is corresponding on the touch area changes.Wherein, hatched example areas is user's touch area, when the touch area moves left by the right side is past, can obviously see when pressing in the vertical direction sense wire and change (such as the S3/S4/S5--S3/S4/S5--S3/S4 among Fig. 4 A to Fig. 4 C) when upper, can obtain larger touch-control sense value, do not press then when having fully, then corresponding touch-control numerical reduction is a lot.When therefore each finger strode across sense wire, the numerical value change of untreatment data (Raw Data) was the most violent, so the numerical value of untreatment data (Raw Data) is subjected to the impact of electrode pattern (Pattern) quite large as can be known.If re-use aforementioned existing critical value (Threshold) judgment mode, determine whether that the mode of effective touch data is come coordinates computed, just cause easily the stair-stepping touch coordinate non-linear behavior of similar Fig. 5.
For addressing the above problem, a kind of prior art adopts the mode that reduces critical value, yet though the method can increase the linearity, causes easily assorted point.Fig. 6 A to Fig. 6 D is the synoptic diagram of existing reduction critical value, wherein, Fig. 6 A is shown as a finger touch position, Fig. 6 B is the numerical value of obtained untreatment data (Raw Data), and Fig. 6 C represents that the oblique line place can be judged as touch position when critical value (Threshold) when being set as 80, Fig. 6 D represents when reducing critical value (Threshold), being set is 30 o'clock, and the oblique line place is judged as touch position, also can increase assorted point simultaneously.
This shows, the setting difficult of critical value (Threshold), set too high, can cause touch-control to be difficult for judging, and then cause the subsequent coordinates conversion linearity not good, set too low, though energy retention wire sex expression, but affected by noise, and allow the former performance that should only have ad-hoc location to touch, many coordinate points within unexpected but shown in Fig. 6 D, occur.
Fig. 7 is the synoptic diagram that a certain continuous pixels of X-axis and Y-axis staggered place is observed the untreatment data (Raw Data) of a period of time on the contact panel.Transverse axis among Fig. 7 is time shaft, and the longitudinal axis is for touching sense value amount.Can decide effective touch sense value size by setting critical value, as shown in phantom in Figure 7 (lower), if the critical value (Threshold) of setting is less, though can keep more untreatment data (Raw Data) amount, and then can keep more detail data, effectively promote linear performance, but might be subject to easily because noise figure is higher noise effect (situation in the square frame), surpass the situation of setting lower critical value and producing the misidentification touch, so system might report the noise coordinate by mistake.Opposite, (Threshold) is larger if the set point setting-out is critical value, is not vulnerable to noise though can guarantee data, and neglecting details is of value to linear touch data, loses linearity performance.In Fig. 7, single only whether assert the data as being touched take critical value (Threshold), if critical value (Threshold) can obviously be sacrificed the linearity though can have higher removal noise effect function greatly.Otherwise use less critical value (Threshold) though can improve the linearity but reduced noise resisting ability.
Yet above-mentioned disposal route also can be because of the difference of the electrode pattern (Pattern) of contact panel, and shows the different linearities.The electrode pattern of some contact panel (Pattern) can increase the linearity and sensing value through special design.But not that each touch-control system commercial city can use the specially designed electrode pattern of this class (Pattern) after all.Therefore, the space that still is improved of the computing technique of the existing touch-control Grid Track linearity.
Summary of the invention
Purpose of the present invention mainly provides a kind of computing method that improve the touch-control Grid Track linearity, to increase the linearity of touching untreatment data, and avoid touching untreatment data and be subject to noise, can allow manufacturer use general electrode pattern, can obtain good touching usefulness.
The present invention proposes a kind of method that improves the touch-control Grid Track linearity, is used for a capacitance type multi-point touch-control system, and described capacitance type multi-point touch-control system comprises a capacitance type touch-control panel and a control device, said method comprising the steps of:
Steps A, described control device read the two-dimentional untreatment data of described capacitance type touch-control panel;
Step B, described control device read the adjacent domain of a pixel and this pixel from described two-dimentional untreatment data;
Step C, judge that whether the pixel value of described pixel is greater than a critical value;
If step D judges the pixel value of described pixel and be not more than described critical value, whether the pixel value of then judging again the adjacent domain of this pixel exists the pixel value greater than described critical value;
If step e judges the pixel value of described adjacent domain and all be not more than described critical value, the pixel value of described pixel is set as the first setting value;
If step F is judged the pixel value of described pixel greater than described critical value, perhaps, there is the pixel value greater than this critical value in the pixel value of judging the adjacent domain of described pixel, then keeps the pixel value of this pixel;
Step G, judge whether all pixels in the described two-dimentional untreatment data all carried out judgement, if not, overline execution in step B then;
Step H, in step G, all carried out judgement if judge all pixels in the described two-dimentional untreatment data, then described two-dimentional untreatment data is carried out the unique point acquisition, and according to described unique point, described two-dimentional untreatment data is divided at least one touch area, and described at least one touch area is compiled identification code.
Touch position is subject to touch panel structure provided and impact electrode pattern easily in the existing capacitance touch control system.But the electrode pattern of capacitance type touch-control panel is the core technology of each contact panel factory, can not allow general manufacturer freely adopt.Therefore based on cost consideration, many hand-held contactor control devices are forced to use performance not good capacitance type touch-control panel structure and electrode pattern.Yet these capacitance type touch-control panel structures and electrode pattern often now have flaw at linear kilsyth basalt, therefore by computing method of the present invention, and Effective Raise linearity performance in the time of allowing capacitance touch control system be applied to different contact panel.
Simultaneously, changing system manufacturer, to be forced to use the predicament of the not good capacitance type touch-control panel structure of performance and electrode pattern very difficult, yet the computing method of the raising touch-control Grid Track linearity of the present invention, can change existing capacitance touching control technical finesse from the method for the two-dimentional untreatment data of contact panel, can be not affected by noise and improve the linear performance of capacitance touching control system coordinates, thereby can reduce the restriction of using different capacitance touching control panel electrode patterns, for the manufacturer of exploitation capacitance touching control system, its system can unrestricted use Different electrodes pattern, and all can have good linearity performance, for whole product competitiveness and compatible performance Effective Raise.
The first-hand original two dimensional untreatment data that technology of the present invention obtains from capacitance type touch-control panel is set about.And in the prior art, then be directly to set a critical value to determine whether being effective touch, if not surpassing critical value then is considered as noise or is little change, and do not consider.Yet, even if reduce critical value setting, can effectively improve the performance of untreatment data aspect the linearity, but but easily in other non-touch area by noise effect, and the problem of the touch point (assorted point) in unexpected appears.The present invention considers the mode of proximity relations, except effective untreatment data that improves is showed nonlinear expression by the improper untreatment data that causes of critical value setting, also can avoid the assorted some impact of non-touch location simultaneously.
Description of drawings
Fig. 1 is the synoptic diagram of existing Inductance and Capacitance sensing;
Fig. 2 is the synoptic diagram that prior art is judged position of touch;
Fig. 3 is the shown nonlinear synoptic diagram of prior art;
Fig. 4 A is that electrode pattern is to the synoptic diagram one of the value effect of untreatment data;
Fig. 4 B is that electrode pattern is to the synoptic diagram two of the value effect of untreatment data;
Fig. 4 C is that electrode pattern is to the synoptic diagram three of the value effect of untreatment data;
Fig. 5 is the schematic diagram data that the actual amount of prior art gets;
Fig. 6 A is the synoptic diagram one of an existing reduction critical value;
Fig. 6 B is the synoptic diagram two of an existing reduction critical value;
Fig. 6 C is the synoptic diagram three of an existing reduction critical value;
Fig. 6 D is the synoptic diagram four of an existing reduction critical value;
Fig. 7 is the synoptic diagram that a certain continuous pixels of X-axis and Y-axis staggered place is observed the untreatment data of a period of time on the contact panel;
Fig. 8 is the process flow diagram of the computing method of the raising touch-control Grid Track linearity of the present invention;
Fig. 9 is the capacitance type multi-point touch-control system schematic of the computing method of the use raising touch-control Grid Track linearity of the present invention;
Figure 10 is the synoptic diagram of the present invention's two dimension untreatment data;
Figure 11 is the synoptic diagram that the present invention processes a pixel;
Figure 12 is the synoptic diagram that the present invention processes the adjacent domain of a pixel;
Figure 13 is the synoptic diagram that the present invention processes two-dimentional untreatment data and judges rear data according to predetermined value;
Figure 14 is that the present invention processes the unique point acquisition of two-dimentional untreatment data and the synoptic diagram that the touch area is divided;
Figure 15 utilizes two-dimensional table to process the synoptic diagram of the unique point acquisition of two-dimentional untreatment data in the embodiment of the invention;
Figure 16 utilizes 3-D histogram to process the synoptic diagram of the unique point acquisition of two-dimentional untreatment data in the embodiment of the invention;
Figure 17 is the synoptic diagram of the data that get of the actual amount of the technology of the present invention.
In the accompanying drawing, the title of each label representative is as follows:
110, driver, 120, sensor, 130, the conductor lines of first direction, 140, Inductance and Capacitance, 150, the conductor lines of second direction, 21, capacitance type touch-control panel, 22, control device, the 31, first conductor lines, the 32, second conductor lines
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, referring to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
Fig. 8 is a kind of process flow diagram that improves the method for the touch-control Grid Track linearity of the present invention, the method is used for as shown in Figure 9 a capacitance type multi-point touch-control system, this capacitance type multi-point touch-control system comprises a capacitance type touch-control panel 21 and a control device 22, wherein, this capacitance type touch-control panel 21 has M bar the first conductor lines 31 that distributes at first direction X and N bar the second conductor lines 32 that distributes at second direction Y, first direction is perpendicular to second direction, M, N is positive integer, the infall of each first conductor lines 31 and the second conductor lines 32 is a pixel p (i of the untreatment data (Raw Data) of corresponding capacitance type touch-control panel 21, j), wherein the scope of i is that the scope of 0 ~ (M-1), j is 0 ~ (N-1).
Method of the present invention is in steps A, and described control device 22 reads the two-dimentional untreatment data (Raw Data) of described capacitance type touch-control panel 21.Described control device 22 can be obtained from described capacitance type touch-control panel 21 numerical value of capacitance variations, this capacitance variations is the mutual 2-D data that forms of X-axis and Y-axis, Figure 10 is the synoptic diagram of the present invention's two dimension untreatment data (Raw Data), and among Figure 10, A and B are two touch locations.Wherein, this two dimension untreatment data (Raw Data) is obtained by the Inductance and Capacitance detection technology, and this two dimension untreatment data (Raw Data) has M * N pixel, and the scope of i is that the scope of 0 ~ (M-1), j is 0 ~ (N-1).
In step B, described control device 22 reads the adjacent domain of a pixel and this pixel from described two-dimentional untreatment data (Raw Data).Figure 11 is the synoptic diagram that the present invention processes a pixel p (i, j), and it is scanning element p (i, j) neighbor point sequentially, observes this pixel p (i, j) magnitude relationship on every side.As shown in figure 11, the location of pixels that the data representation that bold box is lived is considered at present, oblique line lattice data then represent the neighbor point of current pixel.For instance, do discussion with contiguous 8 pixel distribution situations first as shown in figure 11, can expand the neighbor point scope depending on demand, namely working as this pixel is p (i, j), and the pixel of this adjacent domain is p (i-1, j-1), p (i, j-1), p (i+1, j-1), p (i-1, j), p (i+1, j), p (i-1, j+1), p (i, j+1), p (i+1, j+1), i, j is index value, and the scope of i is that the scope of 0 ~ (M-1), j is 0 ~ (N-1).
In step C, judge that whether the pixel value of this pixel p (i, j) is greater than a critical value.It is to judge that whether the pixel value of pixel p (i, j) is greater than this critical value of setting.As shown in figure 11, suppose that this critical value is 80, can find the position of pixel value-1 with pixel value 82 these two pixel datas of pixel p (7,3) of pixel p among Figure 11 (1,1); Pixel value 82 is to surpass to set this critical value, and corresponding to the pixel p (7,3) of this pixel value 82, subsequent step is answered execution in step I; Pixel value-1 surpasses this critical value, and corresponding to the pixel p (1,1) of this pixel value-1, subsequent step is answered execution in step D, with the pixel value of this pixel p of identification (1,1) whether the necessity of existence is arranged.
In step D, be not more than this critical value if judge the pixel value of this pixel, judge again then whether the pixel value of the adjacent domain of this pixel has one at least greater than the pixel value of this critical value.In step D, if, execution in step I.
Figure 12 is the synoptic diagram that the present invention processes the adjacent domain of a pixel p (i, j).In step D, whether the adjacent domain of judging present this pixel p (i, j) of judging has the neighborhood pixels above this critical value, if having, then represent at present this pixel p (i of consideration, j) can affect the performance of coordinate linearity, thereby the necessity of existence, then execution in step I are arranged, for example pixel value is 32 pixel, its adjacent domain has the pixel value (150 and 91) of two pixels to surpass critical value 80, and therefore, pixel value is that 32 pixel need keep.Otherwise, if present this pixel p (i that assesses, j) this adjacent domain in is without any surpassing the pixel of setting this critical value, and then present this pixel p (i, j) considered of expression can not affect the performance of coordinate linearity, so do not exist necessary, execution in step E then, for example pixel value is 8 pixel, its adjacent domain has the pixel value of neither one pixel to surpass critical value 80, therefore, pixel value is that 8 pixel need not to keep.
In step e, if being judged to be of step D is no, judge that even the pixel value of described adjacent domain all is not more than described critical value, then the pixel value with this pixel is set as the first setting value, and for example this first setting value can be 0.
In step G, judge whether all pixels in this two dimension untreatment data (Raw Data) all carried out judgement, if not, overline execution in step B then.
Step G judges whether complete two-dimentional untreatment data (Raw Data) of complete scan, if complete scan is complete, can obtain the result such as Figure 12.Figure 13 be the present invention process two-dimentional untreatment data (Raw Data) and judge according to predetermined value after synoptic diagram, as shown in figure 13, the pixel of some mark backslash (for example wherein the pixel value of backslash is 14 pixel) is then in implementation of the present invention, keep its pixel value, in order to increase the linearity, the pixel (for example the pixel value of its bend is 91 pixel) of some mark oblique line represents that its pixel value surpasses this critical value, and is retained in addition.Should two dimension untreatment data (RawData) if step G judges not yet that been scanned is whole, then continue next pixel, continue the works of step B.
In step H, if step G judges all pixels in this two dimension untreatment data (Raw Data) and all carried out judgement, then this two dimension untreatment data (Raw Data) is carried out the unique point acquisition, namely capture the pixel that the pixel value on the Touch Screen is retained, and according to the unique point that captures, should be divided at least one touch area by two dimension untreatment data (Raw Data), and this few touch area will be compiled identification code.Figure 14 is the synoptic diagram that the present invention processes the unique point acquisition of two-dimentional untreatment data (Raw Data), as shown in figure 14, it should be divided into three touch areas by two dimension untreatment data (Raw Data), compile respectively identification code ID1, ID2, reach ID3, ID3 is in the intersection of ID1 and ID2.Can not carry out the acquisition with unique point of compiling of identification code for those pixels that are reset to 0.
In step I, according to identification code, corresponding this at least one touch area of this identification code is carried out coordinate transformation, and then export corresponding touch coordinate.As shown in figure 14, the first width of cloth representation feature point captures signal, and second width of cloth is that signal is divided in the touch area, and the ID3 zone is the total zone in ID1 zone and ID2 zone, must take into account in the lump when carrying out coordinate transformation.It can use single order momentum (first order momentum) method so that this at least one touch area is carried out coordinate transformation.The ID3 zone is as example in Figure 14, its coordinate of pixel in the ID3 zone is respectively (4,5), (5,5), (6,5), (7,5), pixel value is respectively 33,81,61,32, therefore, its X coordinate is 5 (=[4 * 33+5 * 81+6 * 61+7 * 32]/[33+81+61+32]=1127/207=5.44 ≈ 5), and its Y coordinate is 5 (=[5 * 44+5 * 81+5 * 61+5 * 32]/[33+81+61+32]=1035/207=5).Other regional touch coordinate also can use the single order momentum method to try to achieve, and repeats no more.In other embodiments, also can use other method to calculate touch coordinate.
As shown in figure 15, for utilizing two-dimensional table to process the synoptic diagram of the unique point acquisition of another two-dimentional untreatment data (RawData) in the embodiment of the invention.After the unique point of two-dimentional untreatment data (Raw Data) captured, according to rank-ordered pixels corresponding to unique point and after disturbing the processing of pixel value, obtain two pixels corresponding to actual position of touch, pixel value 608,542 according to these two pixels, utilize two-dimensional table that the touch area is divided into two zones and also compose with identification code ID 1, ID2, wherein ID3 represents the total zone of touch area ID1 and touch area ID2.
As shown in figure 16, for utilizing 3-D histogram to process the synoptic diagram of the unique point acquisition of another two-dimentional untreatment data (RawData) in the embodiment of the invention.All unique points that arrive according to acquisition generate the pixel histogram; Determine zone, the mountain valley between adjacent two peak values in the pixel histogram; Pixel value according to zone, mountain valley character pair point between adjacent two peak values, take the zone, mountain valley as the boundary, divide " mountain peak " zone in left side, " mountain peak " zone on right side, compose respectively to represent identification code ID 1 and ID2, compose with identification code ID 3 in the zone, mountain valley, is the regional ID1 in left side " mountain peak " and the total zone of the regional ID2 in right side " mountain peak ".
Processing for total regional ID3, can form what touch areas according to division processes, what touch areas are arranged, just will have pixel value corresponding to regional ID3 place unique point and be divided into what parts, it is a to distribute for each touch area, to carry out the calculating of the corresponding touch-control coordinate in this touch area.
The above-mentioned touch area of how dividing, and how to calculate touch coordinate, can in detail referring to related art, not repeat them here.
In step F, if the pixel value of judging this pixel greater than this critical value, perhaps, as there is pixel value greater than this critical value in the pixel value of the adjacent domain of pixel as described in judging, then keeps the pixel value of this pixel, and execution in step G.
Figure 17 is the synoptic diagram of the data that get of the actual amount of the technology of the present invention.Relatively Figure 17 and Fig. 5 as can be known, the technology of the present invention can not exist in the prior art when touch location passes through sense wire, the stepped nonlinear phenomenon that causes.Be the linearity that the technology of the present invention can increase touching untreatment data (Raw Data), can not allow again touching untreatment data (Raw Data) be subject to noise.
Touch position is subject to touch panel structure provided and impact electrode pattern (Pattern) easily in the existing capacitance touch control system.But the electrode pattern of capacitance type touch-control panel is the core technology of each contact panel factory, can not allow general manufacturer freely adopt.Therefore based on cost consideration, many hand-held contactor control devices are forced to use performance not good capacitance type touch-control panel structure and electrode pattern.Yet these capacitance type touch-control panel structures and electrode pattern often now have flaw at linear kilsyth basalt, therefore by computing method of the present invention, and Effective Raise linearity performance in the time of allowing capacitance touch control system be applied to different contact panel.
Simultaneously, changing system manufacturer, to be forced to use the predicament of the not good capacitance type touch-control panel structure of performance and electrode pattern very difficult, yet the computing method of the raising touch-control Grid Track linearity of the present invention, can change existing capacitance touching control technical finesse from the method for the two-dimentional untreatment data (Raw Data) of contact panel, can be not affected by noise and improve the linear performance of capacitance touching control system coordinates, thereby can reduce the restriction of using different capacitance touching control panel electrode patterns (Pattern), for the manufacturer of exploitation capacitance touching control system, its system can unrestricted use Different electrodes pattern, and all can have good linearity performance, for whole product competitiveness and compatible performance Effective Raise.
The first-hand original two dimensional untreatment data (Raw Data) that technology of the present invention obtains from capacitance type touch-control panel is set about.And in the prior art, then be directly to set a critical value (Threshold) to determine whether being effective touch, if not surpassing critical value then is considered as noise or is little change, and do not consider.Yet, even if reduce critical value setting, can effectively improve the performance of untreatment data (Raw Data) aspect the linearity, but but easily in other non-touch area by noise effect, and the problem of the touch point (assorted point) in unexpected appears.The present invention considers the mode of proximity relations, except effective untreatment data (Raw Data) that improves is showed nonlinear expression by the improper untreatment data (RawData) that causes of critical value setting, also can avoid the assorted some impact of non-touch location simultaneously.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (9)
1. method that improves the touch-control Grid Track linearity is used for a capacitance type multi-point touch-control system, and described capacitance type multi-point touch-control system comprises a capacitance type touch-control panel and a control device, said method comprising the steps of:
Steps A, described control device read the two-dimentional untreatment data of described capacitance type touch-control panel;
Step B, described control device read the adjacent domain of a pixel and this pixel from described two-dimentional untreatment data;
Step C, judge that whether the pixel value of described pixel is greater than a critical value;
If step D judges the pixel value of described pixel and be not more than described critical value, whether the pixel value of then judging again the adjacent domain of this pixel exists the pixel value greater than described critical value;
If step e judges the pixel value of described adjacent domain and all be not more than described critical value, the pixel value of described pixel is set as the first setting value;
If step F is judged the pixel value of described pixel greater than described critical value, perhaps, there is the pixel value greater than this critical value in the pixel value of judging the adjacent domain of described pixel, then keeps the pixel value of this pixel;
Step G, judge whether all pixels in the described two-dimentional untreatment data all carried out judgement, if not, overline execution in step B then;
Step H, in step G, all carried out judgement if judge all pixels in the described two-dimentional untreatment data, then described two-dimentional untreatment data is carried out the unique point acquisition, and according to described unique point, described two-dimentional untreatment data is divided at least one touch area, and described at least one touch area is compiled identification code.
2. the method for the raising touch-control Grid Track linearity as claimed in claim 1 is characterized in that described method also comprises:
Step I, according to the two-dimentional untreatment data of described identification code and corresponding touch area, carry out coordinate built and resolution and calculate, and then export corresponding touch coordinate.
3. the method for the raising touch-control Grid Track linearity as claimed in claim 1, it is characterized in that: described two-dimentional untreatment data is obtained by the Inductance and Capacitance detection technology.
4. the method for the raising touch-control Grid Track linearity as claimed in claim 1 is characterized in that described capacitance type touch-control panel has: M bar the first conductor lines that distributes at a first direction, and N bar the second conductor lines that distributes in a second direction; Wherein, described first direction is perpendicular to described second direction, and M, N are positive integer.
5. the method for the raising touch-control Grid Track linearity as claimed in claim 4, it is characterized in that: described two-dimentional untreatment data has M * N pixel; Wherein, the i value is that 0 ~ (M-1), j value is 0 ~ (N-1).
6. the method for the raising touch-control Grid Track linearity as claimed in claim 4, it is characterized in that: described pixel is p (i, j), and the pixel of described adjacent domain is p (i-1, j-1), p (i, j-1), p (i+1, j-1), p (i-1, j1), p (i+1, j), p (i-1, j+1), p (i, j+1), p (i+1, j+1); Wherein, the i value is that 0 ~ (M-1), j value is 0 ~ (N-1).
7. the method for the raising touch-control Grid Track linearity as claimed in claim 2 is characterized in that, among the described step I, adopts the single order momentum method to carry out coordinate built and resolution calculation, and then exports corresponding touch coordinate.
8. the method for the raising touch-control Grid Track linearity as claimed in claim 1 is characterized in that, according to described unique point, described two-dimentional untreatment data is divided at least one touch area, and described at least one touch area is compiled identification code comprises:
To descending ordering of pixel value corresponding to all unique points of acquisition, the pixel value characteristic of correspondence point according to coming front two is divided at least one touch area with described two-dimentional untreatment data, and then compiles corresponding identification code.
9. the method for the raising touch-control Grid Track linearity as claimed in claim 1 is characterized in that, according to described unique point, described two-dimentional untreatment data is divided at least one touch area, and described at least one touch area is compiled identification code comprises:
All unique points that arrive according to acquisition generate the pixel histogram;
Determine zone, the mountain valley between adjacent two peak values in the pixel histogram;
Pixel value according to zone, mountain valley character pair point between adjacent two peak values is divided at least one touch area with described two-dimentional untreatment data, and then compiles corresponding identification code.
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