CN103513835B - A kind of touch coordinate detection method based on mutual capacitance touchscreens - Google Patents
A kind of touch coordinate detection method based on mutual capacitance touchscreens Download PDFInfo
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- CN103513835B CN103513835B CN201210212937.6A CN201210212937A CN103513835B CN 103513835 B CN103513835 B CN 103513835B CN 201210212937 A CN201210212937 A CN 201210212937A CN 103513835 B CN103513835 B CN 103513835B
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Abstract
A kind of touch coordinate detection method based on mutual capacitance touchscreens, including the first scanning step, the second scanning step, coordinate calculating process.First scanning step scans line by line, records touch intensity and the coordinate of every sub regions on touch screen, is labeled as touch sensible point by touching intensity more than the subregion of reference value set in advance.First any one touch sensible point is labeled as and is recorded a little by the second scanning step, then scanning around closes on 8 points one by one, if scan around adjacent 8 have touch sensible point, then record the coordinate of these points, the point these being recorded subsequently is labeled as and is recorded a little, and repeat the above steps；If it is not detected that touch sensible point, then the second scanning step terminates.What coordinate calculating process used in first, second scanning step all is recorded touch intensity a little and coordinate, calculates the coordinate of the center of touch point.
Description
Technical field
The present invention relates to a kind of touch coordinate detection method based on mutual capacitance touchscreens.
Background technology
In recent years, the aspects such as capacitive touch screen is at various electronic equipments, particularly handheld type digital equipment, for instance mobile phone, palm PC, panel computer are used widely.Wherein mutual capacitance type touch screen is owing to possessing the ability of multi-point touch, represents the trend of following capacitive touch screen development.
One mutual capacitance touchscreens includes the electrod-array of N row M row, N number of row electrode of every a line is joined together to form row electrode array by wire, M row electrode of every string is joined together to form row electrode array also by wire, each electrode on electrode ranks has inductance capacitance with neighbouring four electrodes, when finger or conductor are touched near electrode, these inductance capacitances can change, by detecting the position that the inductance capacitance variable quantity of NXM electrode and neighbouring electrode detects the finger touching of people within a certain period of time.
During mutual capacitance touchscreens work, testing circuit outside touch screen sends detection signal to each row electrode array successively, and the signal passed back is received by every string electrode array, when one of them row electrode array is detected, by detecting the position that the change of each row electrode on this row electrode array and the inductance capacitance of the row electrode closed on determines whether to touch and touch, when the changing value of inductance capacitance is more than reference value set in advance, then it is assumed that this point has touch.
Needs for the accurate of detection coordinates and software application; the area that these electrodes are commonly designed is less; the electrode area of such as certain touch screen for mobile phone only has 0.125 square centimeter; and the finger of people is not of uniform size; when finger is by upper touch screen; the changing value of inductance capacitance of more than one electrode usually can be occurred more than the situation of reference value set in advance; namely designer needs to solve when touching the changing value causing the inductance capacitance of multiple electrodes of next-door neighbour mutually more than reference value set in advance, the problem how drawing the coordinate of the central point of touch.
Summary of the invention
The present invention provides a kind of touch coordinate detection method based on mutual capacitance touchscreens, including the first scanning step, the second scanning step and coordinate calculating process.
First scanning step scans line by line, records touch intensity and the coordinate of every sub regions on touch screen, is labeled as touch sensible point 1 by touching intensity more than the subregion of reference value set in advance.First any one touch sensible point 1 is labeled as initial sweep point and is recorded a little 2 by the second scanning step, scanning subsequently is recorded a little adjacent 8 points around 2, if scan around adjacent 8 have touch sensible point 1, then record the coordinate of these points, the point these being recorded subsequently is labeled as and is recorded a little 2, and repeat the above steps；If it is not detected that touch sensible point 1, then the second scanning step terminates.Coordinate calculating process uses all touch intensity being recorded a little 2 in first, second scanning step and coordinate, calculates the coordinate of the center of touch point.
In second scanning step, around scanning one by one, adjacent 8 can adopt around central point scanning direction clockwise or counter-clockwise.The coordinate of the center calculating touch point can adopt Weighted Average Algorithm.
A kind of touch coordinate detection method based on mutual capacitance touchscreens provided by the invention, it is possible to when both being greater than reference value set in advance when the touch intensity of the multiple coordinates closed on mutually on mutual capacitance touchscreens, draws the coordinate position touching central point accurately.
Accompanying drawing explanation
Fig. 1 illustrates that mutual capacitance touchscreens of the present invention is divided into the scanning coordinate of many sub regions and subregion by electrode and touches intensity corresponding relation schematic diagram；
Fig. 2 illustrates the step block diagram of the touch coordinate detection method based on mutual capacitance touchscreens of the present invention；
Fig. 3 illustrates the schematic diagram of an embodiment of the second scanning step of the touch coordinate detection method based on mutual capacitance touchscreens of the present invention；
Fig. 4 illustrates of the present invention based in the second scanning step of the touch coordinate detection method of mutual capacitance touchscreens, to be recorded adjacent around 8 one by one detection time sequence detection schematic diagram clockwise and anticlockwise.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
One mutual capacitance touchscreens generally has the row electrode array crossed one another and row electrode array, crossover location according to these row electrode arrays and row electrode array, the surface of described mutual capacitance touchscreens (4) is divided into many equal-sized subregions, and these subregions are arranged in arrays as shown in Figure 1.The coordinate xy of these subregions is determined at the coordinate x of X-direction by the row electrode array crossed one another coordinate y in the Y direction and row electrode array.Mutual capacitance touchscreens (4) also can store and read the depositor array (3) of data.
Touch coordinate detection method based on mutual capacitance touchscreens of the present invention, including the first scanning step the 5, second scanning step 6 and coordinate calculating process 7.The order block diagram of these steps as in figure 2 it is shown, wherein the second scanning step 6 include initial step 61 and circulation step 62.
First the first scanning step 5 is carried out: launch detection signal to every a line electrode array successively, the touch intensity c of the subregion near the crossover location of the row electrode on every string electrode array that detection is intersected with this row electrode array one by one, determine whether to touch, after one row electrode array detection, then detection next line electrode array, until having detected the every sub regions on touch screen, and record the coordinate xy of every sub regions one to one and touch intensity c；Described coordinate xy is defined with the row electrode array intersected position y and x on mutual capacitance touchscreens by this row electrode array, and described touch intensity c detects this changing value owing to touching the mutual capacitance caused.Being labeled as touch sensible point 1 by touching intensity higher than the subregion of reference value set in advance, all the other subregions are labeled as no touch point 0.Such as assuming the finger touch area behaved in the shadow region shown in Fig. 1, have 4 sub regions and be touched, these subregions more than reference value set in advance, are then labeled as 1 by the touch intensity of these subregions, and all the other subregions are labeled as 0.
Second scanning step 6 includes initial step 61, circulation step 62；Described initial step 61 is for from any one touch sensible point 1, using this touch sensible point as initial sweep point, is labeled as and is recorded a little 2, and the coordinate storage that this is recorded a little 2 enters the originating register in depositor array 8；Circulation step 62 is that detection is recorded other eight consecutive points of the well word grid centered by the coordinate of a little 2 one by one subsequently, be namely recorded a little 2 upper and lower, left and right, upper left, lower-left, upper right, eight, bottom right point；If the partial dot in adjacent 8 is touch sensible point 1 around finding in detection process, namely when the touch intensity of these points is higher than reference value set in advance, then these touch sensible points 1 are labeled as and are recorded a little 2, these are recorded the coordinate of a little 2 store successively in the follow-up register of depositor array 8, continue cycling through step 62；If finding in detection process that newfound all being recorded a little all does not have touch sensible point 1 in adjacent 8 around 2 in upper once circulation step, only no touch point 0 and be recorded a little 2, then circulation step 62 terminates；Described second scanning step terminates.As in figure 2 it is shown, the precondition that circulation step 62 is circulated is to have touch point 1；And circulation step 62 terminates, entering the precondition of coordinate calculating process 7 is newfound in upper once circulation all be recorded a little adjacent 8 all no touch points 1 around 2.
In order to better illustrate the process of the second scanning step 6, Fig. 3 illustrates an embodiment of the second scanning step 6.Fig. 3 is divided into a-f six part.Fig. 3 a is shown in the first scanning step 5, is labeled as 1 by touching intensity more than the touch sensible point of reference value set in advance.Initial step 61 in the second scanning step, wherein will be labeled as and be recorded a little 2 by any one touch sensible point 1, record the coordinate (x1 of this point, y1) in depositor array 8, circulation step starts subsequently, namely scan this and be recorded a little 2 (x1, y1) 8 points around, as shown in Figure 3 b.When scan around 8 have touch intensity more than the touch sensible point 1 of reference value set in advance time, as shown in Figure 3 c, the two touch sensible point 1 is labeled as and is recorded a little 2, these are recorded the coordinate (x2 of a little 2, y2), (x3, y3) record in depositor array 8, continue cycling through step 62, namely scan this and be recorded a little adjacent 8 points around 2.In Fig. 3 d, what be newly marked in scanning Fig. 3 c is recorded a little 2 (x2, y2) adjacent 8 points around, it may be judged whether have touch sensible point 1.In Fig. 3 e, the touch sensible again found point 1 is labeled as and is recorded a little 2, by this point coordinates (x4, y4) record in depositor array 8, scan again in Fig. 3 c another labeled out be recorded a little 2 (x3, y3), continue cycling through step 62, namely scan this and be recorded a little adjacent 8 points around 2.In Fig. 3 f, what scanning was newly marked in Fig. 3 e is recorded a little 2 (x4, y4) adjacent 8 points around, find only be marked as the no touch point of 0 and be recorded a little 2, without touch sensible point 1, be recorded owing to last time circulation is newfound and a little 2 only have 2 (x4, y4), namely in last circulation step, newfound all being recorded in adjacent 8 of the surrounding of a little 2 does not all have touch sensible point 1, and at this moment circulation step 62 terminates, and the second scanning step 6 terminates.
In circulation step 62 in second scanning step 6, one by one scanning be recorded a little around 2 the method for adjacent 8 can be to be recorded a little scanning clockwise centered by 2, can also be counterclockwise scanning, it is also possible to be other orders, as long as unduplicated scanning sequency is just passable one by one.
Coordinate calculating process 7 is: the corresponding relation utilizing the coordinate xy drawn in all coordinates being recorded a little 2 being stored in depositor array 8 in the second scanning step 6 and the first scanning step 5 with touching intensity c, this corresponding relation is as shown in Figure 1, coordinate scanning step 7 calculates the coordinate touching central point by algorithm, such as Weighted Average Algorithm, namely touches the coordinate of center XY:
X=∑ (c*x)/∑ c
Y=∑ (c*y)/∑ c
Wherein ∑ c represents the sum of all touch intensity c being recorded a little 2；∑ (c*x) represent all be recorded the abscissa x of a little 2 product with the touchs intensity c of this point and, ∑ (c*y) represent the product of the touch intensity c of all vertical coordinate y being recorded a little 2 and this point and.
Touch coordinate detection method based on mutual capacitance touchscreens provided by the invention, it is possible to when both being greater than reference value set in advance when the touch intensity of the multiple coordinates closed on mutually on mutual capacitance touchscreens, draws the coordinate position touching central point accurately.
It should be noted that above example is intended merely to clear succinct explanation, it is not limited to the method fixed, for instance the only initial sweep point in the second scanning step in embodiment described in simple transformation, it is clear that also drop within protection scope of the present invention.
Above-described it is only the preferred embodiments of the present invention; described embodiment is also not used to limit the scope of patent protection of the present invention; therefore the equivalent structure change that the description of every utilization present invention and accompanying drawing content are made, in like manner should be included in protection scope of the present invention.
Claims (2)
1. the touch coordinate detection method based on mutual capacitance touchscreens；
Described mutual capacitance touchscreens (4) includes the row electrode array and the row electrode array that cross one another, crossover location according to described row electrode array and row electrode array, the surface of described mutual capacitance touchscreens (4) is divided into equal-sized subregion, and these subregions are arranged in arrays；Described mutual capacitance touchscreens (4) also can store and read the depositor array (8) of data；The touch coordinate detection method of described mutual capacitance touchscreens includes the first scanning step (5), the second scanning step (6), coordinate calculating process (7)；
Described first scanning step (5) is: launch detection signal to every a line electrode array successively, the touch intensity c of the subregion near the crossover location of the row electrode on every string electrode array that detection is intersected with this row electrode array one by one, determine whether to touch, after one row electrode array detection, then detection next line electrode array, until having detected the every sub regions on touch screen, and record the coordinate xy of every sub regions and touch the corresponding relation of intensity c；Described coordinate xy is defined with the row electrode array intersected position y and x on mutual capacitance touchscreens by this row electrode array, and described touch intensity c detects the described coordinate xy changing value owing to touching the mutual capacitance caused；After detection, being labeled as touch sensible point (1) by touching intensity higher than the subregion of reference value set in advance, all the other subregions are labeled as no touch point (0)；
Described second scanning step (6) includes initial step (61), circulation step (62)；Described initial step (61) is from any one touch sensible point (1), being labeled as by this touch sensible point and be recorded point (2), the coordinate record that this is recorded point (2) enters described depositor array (8)；Described circulation step (62) is other eight consecutive points detecting the well word grid centered by the coordinate to be recorded point (2) subsequently one by one, is namely recorded the upper and lower, left and right of point (2), upper left, lower-left, upper right, eight, bottom right point；If the partial dot in adjacent 8 is touch sensible point (1) around finding in detection process, namely when the touch intensity of these points is higher than reference value set in advance, then these touch sensibles point (1) are labeled as and are recorded point (2), the coordinate record that these are recorded point (2) enters described depositor array (8), continues cycling through step (62)；If detection process finds in all adjacent 8 of the surroundings being recorded point (2) detected in last time circulation all without touch sensible point (1), only no touch point (0) and be recorded point (2), then circulation step (62) terminates；Described second scanning step (6) is terminated；
Described coordinate calculating process (7) is: utilize all coordinates being recorded point (2) and the coordinate xy drawn and the corresponding relation touching intensity c in described first scanning step (5) that are stored in depositor array (8) in the second scanning step (6), draw all coordinates being recorded point (2) and corresponding touch intensity, by calculating the coordinate touching central point；
Utilizing all coordinate xy being recorded point (2) to calculate, with touch intensity c, the method touching center point coordinate XY is Weighted Average Algorithm, namely
X=∑ (c x)/∑ c；
Y=∑ (c y)/∑ c；
Wherein ∑ c represents the sum of all touch intensity being recorded point (2)；
∑ (c x) represent the product of the touch intensity c of all abscissa x and described coordinate xy being recorded point (2) and, ∑ (c y) represent the product of the touch intensity c of all vertical coordinate y and described coordinate xy being recorded point (2) and.
2. the touch coordinate detection method based on mutual capacitance touchscreens as claimed in claim 1, it is characterized in that: in the circulation step (62) of described second scanning step (6), being according to be recorded centered by a little to the detection one by one of adjacent 8 of the surrounding being recorded point (2), direction carries out detecting clockwise or counter-clockwise.
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| US10481707B2 (en) * | 2014-05-07 | 2019-11-19 | Egalax_Empia Technology Inc. | Touch sensitive information transmission method, processor and system |
| CN105204676B (en) * | 2014-06-27 | 2018-08-07 | 联想(北京)有限公司 | Input method and electronic equipment |
| CN105808019B (en) * | 2014-12-31 | 2020-06-23 | 鸿合科技股份有限公司 | Contact coordinate detection method for infrared touch screen |
| JP6631612B2 (en) * | 2017-12-18 | 2020-01-15 | Smk株式会社 | Touch panel input position detection method |
| CN111414118A (en) * | 2019-01-08 | 2020-07-14 | 敦泰电子有限公司 | Touch center calculation method, touch system and touch device |
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| CN101387927A (en) * | 2008-11-04 | 2009-03-18 | 友达光电股份有限公司 | Touch control detecting method of touch control panel |
| CN101882027A (en) * | 2010-07-16 | 2010-11-10 | 友达光电股份有限公司 | Detecting method of touch point coordinate |
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| CN101387927A (en) * | 2008-11-04 | 2009-03-18 | 友达光电股份有限公司 | Touch control detecting method of touch control panel |
| CN101882027A (en) * | 2010-07-16 | 2010-11-10 | 友达光电股份有限公司 | Detecting method of touch point coordinate |
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