CN102200851A - Touch panel and touch detection method - Google Patents
Touch panel and touch detection method Download PDFInfo
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- CN102200851A CN102200851A CN2010101382931A CN201010138293A CN102200851A CN 102200851 A CN102200851 A CN 102200851A CN 2010101382931 A CN2010101382931 A CN 2010101382931A CN 201010138293 A CN201010138293 A CN 201010138293A CN 102200851 A CN102200851 A CN 102200851A
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Abstract
The invention discloses a touch detection method which comprises the following step: providing a touch panel, wherein the touch panel is provided with a plurality of sequentially abreast axial sensors, and each axial sensor outputs sensing signals. The touch detection method is used for calculating assertion data according to the sensing signals, wherein the assertion data sequentially corresponds to one of the axial sensors or corresponds to one of a plurality of sensor pairs consisting of the axial sensors. When two adjacent assertion data are respectively greater than and less than a reference value, in the touch detection method, a touch point is decided according to the positions of the axial sensors or the sensor pairs corresponding to the assertion data.
Description
Technical field
The invention relates to the touch detection method of a kind of contact panel and use thereof; The touch detection method of capacitance type touch-control panel and use thereof particularly.
Background technology
Touch control display panel has been very general on the market electronic installation at present, also is widely used in mobile phone, screen and notebook computer, so that electronic product also can receive user's instruction by touch-control in show image.In addition, the multipoint mode contact panel with multi-point touch sensing function also replaces the single-point type contact panel at leisure, and by the multi-point touch sensing function provide single-point type contact panel in the past the application function that can't accomplish.
Figure 1A is depicted as the synoptic diagram of known contact panel 10, and wherein the known contact panel 10 of present embodiment is a kind of capacitance type touch-control panel.Known contact panel 10 comprises plural X-axis induction chain X1, X2, X3, X4, X5, X6, X7, X8 and plural Y-axis induction chain Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8.Figure 1A has also shown X-axis induced signal x1, x2, x3, x4, x5, x6, x7, x8 and Y-axis induced signal y1, y2, y3, y4, y5, y6, y7, y8.Shown in Figure 1A, the user forms one first touch points 600 by touching on known contact panel 10.Because user's touching changes the whole effective capacitance of X-axis induction chain X7 and Y-axis induction refining Y3, so signal x7 and y3 that X-axis induction chain X7 and Y-axis induction chain Y3 are exported are higher than the signal that other induction chains are exported.The signal processing module 430 of known contact panel 10 is being received after X-axis is handled the signal of bar and will judged the coordinate of first touch points, 600 central points on X-axis according to the position that the corresponding X-axis of peak signal institute is responded to chain.Similarly, the coordinate computing module will be handled the pairing Y-axis of peak signal that bar is exported induction chain position according to Y-axis and judge the coordinate of the first touch points central point on Y-axis.Therefore the signal processing module of known contact panel 10 coordinate that will judge first touch points 600 according to above-mentioned Rule of judgment for (X7, Y3).
In addition, the known contact panel 10 shown in Figure 1B further comprises second touch points 610, and wherein second touch points 610 will make that the Y-axis induction refining induced signal y5 that Y5 exported is greater than the induced signal y4 outside the Y-axis induction refining Y4.The signal processing module of contact panel will detect the less induced signal y4 of amplitude between the induced signal y3 of amplitude maximum and y5 and two induced signals, and judge the existence and the coordinate of first touch points 600 and second touch points 610 according to the magnitude relationship between above-mentioned induced signal.
By top narration as can be known, above-mentioned known touch detection method is to judge maximal value and minimum value by detecting induced signal and comparison induced signal, and judges the existence of touch points and the coordinate of definition touch points in view of the above.Yet above-mentioned known touch detection method need carry out signal detection and comparison repeatedly, and it is to be strengthened therefore to need bigger resource and efficient also to have in computing.In addition, known touch detection method is not included the assorted letter of environment of operation in the limit of consideration of coordinate calculating in, so the assorted letter of environment of operation may have influence on the signal to noise ratio (Signal-to-noise-ratio) of known contact panel even may have influence on the correctness that touch points is detected.
Summary of the invention
The object of the invention one for providing a kind of contact panel and a kind of touch detection method to can be used for providing function of multi-spot touch.
Another object of the present invention is used to promote the accuracy of touch points for a kind of contact panel and a kind of touch detection method are provided.
The present invention comprises a kind of contact panel and a kind of touch detection method, and wherein touch detection method comprises to provide and has the plural number contact panel of axial induction refining, wherein each axial induction refining output one induced signal side by side in regular turn.Touch detection method is to obtain the judgement data according to induced signal, wherein judgement data be in regular turn corresponding to axial induction device one of them or the plural inductor that constitutes by the refining of two axial inductions to one of them.When two adjacent judgement data be respectively greater than and during less than a reference value, touch detection method will refine or right determining positions one touch points of inductor axial induction according to one of them institute of judgement data.In other words, when touch points results from the contact panel, the induced signal that refining is exported as two adjacent axial inductions is to be higher than respectively and when being lower than the said reference value, the signal processing module of contact panel will be according to the position or the coordinate of above-mentioned at least two induced signals decision touch points.
In different embodiment, it is right that contact panel of the present invention comprises plural inductor, and wherein each inductor is to comprising two adjacent axial induction refinings.The signal processing module of contact panel will be obtained each inductor to the difference of comprising of the axial induction refining induced signal of exporting and produce a differential values.When touch points produces, two adjacent differential values be respectively greater than and during less than reference value, signal processing module will be obtained the coordinate of touch points according to one of them institute's respective shaft of differential values to position of inductor.
In addition, can set a threshold values in addition, wherein threshold values is being represented the average amplitude of assorted letter in the environment of operation.Even on the order adjacent induced signal be simultaneously greater than and less than reference value, above-mentioned induced signal one of them the amplitude and the difference of reference value at least need be greater than threshold values.Thus, touch detection method of the present invention is avoided arriving in fact non-existent touch points because of the assorted letter error detection of environment of operation by the setting of threshold values.
Description of drawings
Figure 1A and Figure 1B are depicted as the synoptic diagram of known contact panel;
Fig. 2 A, Fig. 2 B and Fig. 2 C are depicted as the synoptic diagram of contact panel of the present invention;
Figure 3 shows that another embodiment of contact panel shown in Fig. 2 A, Fig. 2 B and Fig. 2 C;
Fig. 4 A, Fig. 4 B, Fig. 4 C and Figure 5 shows that the alternate embodiment of contact panel shown in Fig. 2 A;
Figure 6 shows that the block diagram of touch detection method of the present invention; And
Fig. 7 and Figure 8 shows that the alternate embodiment of touch detection method shown in Figure 6.
The main element symbol description
100 contact panels
X1, X2, X3, X4, X5, X6, X7, X8:X axle induction chain
210X axle inductor
The 220X mandrel connector
The 230X axial electrode
Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8:Y axle induction chain
310Y axle inductor
The 320Y mandrel connector
The 330Y axial electrode
400 signal processing modules
410 multiplexers
420 analog-digital converters
430 coordinate computing modules
600 first touch points
610 second touch points
700 first reference values
710 second reference values
800 threshold values
X1, x2, x3, x4, x5, x6, x7, x8X axle induced signal
Δ x1, Δ x2, Δ x3, Δ x4, Δ x5, Δ x6, Δ x7, Δ x8X axle differential values
Y1, y2, y3, y4, y5, y6, y7, y8Y axle induced signal
Δ y1, Δ y2, Δ y3, Δ y4, Δ y5, Δ y6, Δ y7, Δ y8Y axle differential values
Embodiment
The present invention discloses a kind of contact panel and touch detection method, particularly a kind of contact panel with multi-point touch function.One of the object of the invention produces a plurality of corresponding judgement data for a kind of contact panel and a kind of touch detection method induced signal that refining is exported according to a plurality of axial inductions is provided, and judges that wherein data can be in regular turn refines one of them or correspondingly in regular turn constituted inductor to one of them by adjacent axial induction refining institute corresponding to those axial inductions.Simultaneously, touch detection method of the present invention will define a reference value and detect simultaneously decision signal whether simultaneously greater than and less than reference value, and judge whether have the touch points that produces because of user's touching on the contact panel according to the detecting result.
Fig. 2 A is depicted as the synoptic diagram of contact panel 100, and wherein the contact panel 100 of present embodiment is to be a kind of capacitance type touch-control panel.Shown in Fig. 2 A, contact panel 100 comprises plural X-axis induction chain X1, X2, X3, X4, X5, X6, X7, X8, plural Y-axis induction chain Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8 and signal processing module 400, wherein signal processing module 400 comprises multiplexer (Multiplexer) 410, analog-digital converter (Analogue-to-digital converter) 420 and coordinate computing module 430.The X-axis induction chain X1 of present embodiment, X2, X3, X4, X5, X6, X7, X8 is in regular turn side by side, and wherein each X-axis induction chain comprises plural X-axis inductor 210 and plural X-axis connector 220, and each X-axis connector 220 is to be electrically connected on adjacent X-axis inductor 210 simultaneously so that two X-axis inductors 210 electrically connect mutually.Similarly, Y-axis induction chain Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8 are in regular turn side by side, wherein each Y-axis induction chain also comprises plural Y-axis inductor 310 and plural Y-axis connector 320, and each Y-axis connector 320 is to be connected in adjacent Y-axis inductor 310 simultaneously so that two Y-axis inductors 310 electrically connect mutually.In addition, the X-axis connector 220 and the Y-axis connector 320 that overlap mutually in Fig. 2 A all pass through insulation processing, also can mutual conduction even therefore be in contact with one another.
Shown in Fig. 2 A, X-axis induction chain X1, X2, X3, X4, X5, X6, X7, X8 and Y-axis induction chain Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8 comprise plural X-axis electrode 230 and plural Y-axis electrode 330 respectively, and wherein X-axis electrode 230 is to be electrically connected on the end of X-axis induction chain with the output induced signal.Similarly, Y-axis electrode 330 is to be electrically connected on the terminal Y-axis inductor 310 of Y-axis induction chain with the output induced signal.X-axis electrode 230 and Y-axis electrode 330 are to be electrically connected on multiplexer 410 to transfer to analog-digital converter 420 X-axis is responded to the signal exported of chain and Y-axis induction chain by multiplexer 410, and analog-digital converter 420 transfers to coordinate computing module 430 for the further parsing and the processing of touch points with induced signal with digital form more afterwards.In the present embodiment, the signal that X-axis induction refining and Y-axis induction refining are exported is a voltage, but is not limited thereto; In different embodiment, also electric current or other can be represented X-axis induction refining and Y-axis induction refining electric capacity and can be for the data form of calculating to above-mentioned signal.
Fig. 2 B is depicted as another synoptic diagram of contact panel shown in Fig. 2 A, and wherein X-axis is responded to chain X1, X2, X3, X4, X5, X6, X7, X8 and Y-axis induction chain Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8 sees through X-axis electrode 230 in first period and Y-axis electrode 330 is exported plural X-axis induced signal x1, x2, x3, x4, x5 respectively, x6, x7, x8 and plural Y-axis induced signal y1, y2, y3, y4, y5, y6, y7, y8 is to signal processing module 400.In preferred embodiment, all X-axis induced signals can be exported in the same time point in first period simultaneously; Yet in different embodiment, the X-axis induced signal also can be exported by the different time points in first period.In the present embodiment, the user forms one first touch points 600 by touching on contact panel, wherein first touch points 600 has changed the whole effective capacitance of X-axis induction chain X7 and Y-axis induction chain Y3, so the signal that above-mentioned induction chain is exported is to be higher than the signal that other induction chains are exported.In addition, the area that first touch points 600 covers the induction chains is that the pass of the signal amplitude exported with this induction chain is positive correlation, but is not limited thereto; In different embodiment, the area of first touch points 600 can be a negative correlation with the output amplitude of induction refining.
In the embodiment shown in Fig. 2 B, contact panel 100 is set with a first reference value 700 and one second reference value 710.Shown in Fig. 2 B, first touch points 600 covers the area maximum of X-axis induction chain X7, so the amplitude of X-axis induced signal x7 is the X-axis induced signal of exporting greater than other X-axis induction chains.In addition, X-axis induced signal x6 and x7 are that X-axis induced signal x7 and x8 are simultaneously respectively greater than reaching less than first reference value 700 greater than first reference value 700 less than reaching respectively simultaneously.Coordinate computing module 430 will detect above-mentioned relation after receiving X-axis induced signal x6, x7 and x8 from analog-digital converter 420.Comparison according to above-mentioned X-axis induced signal x6 and x7 and first reference value 700, or according to the comparison of X-axis induced signal x7 and x8 and first reference value 700, coordinate computing module 430 will judge the higher X-axis induced signal of amplitude x7 the position of corresponding X-axis inductor X7 be the X-axis coordinate of first touch points 600.Similarly, coordinate computing module 430 will according to second reference value 710 detect Y-axis induced signal y3 the position of corresponding Y-axis induction chain Y3 be the Y-axis coordinate of first touch points 600.So as seen, each X-axis induced signal of present embodiment and each Y-axis induced signal are the judgement data that is used to detect first touch points, 600 coordinates.
In addition, shown in Fig. 2 B, in order to include the assorted letter in the environment for use in touch detection and judgement consider, the contact panel 100 of present embodiment further can be set a threshold values 800, and it is representing the value of the interference that contact panel may be subjected to.In the present embodiment, one of condition of judging coordinate be when the adjacent X-axis induced signal of two orders respectively when reaching less than first reference value 700, two X-axis induced signals difference of one of them and first reference value 700 at least are greater than threshold values 800.Thus, even the assorted letter of environment for use is higher than first reference value 700, contact panel 100 also can reduce the chance that detects wrong touch points because of assorted letter.For instance, shown in Fig. 2 B, even X-axis induced signal x7 is greater than first reference value 700, coordinate computing module 430 must confirm that still the difference of X-axis induced signal x7 and first reference value 700 is greater than threshold values 800, could judge that the position of X-axis induction chain X7 is the X-axis coordinate of first touch points 600.In the embodiment shown in Fig. 2 B, two X-axis induced signals difference of one of them and first reference value 700 at least are greater than threshold values 800, but are not limited thereto; In different embodiment, contact panel 100 also can require the difference palpus of two X-axis induced signals and first reference value 700 simultaneously greater than threshold values 800.
Fig. 2 C is depicted as the alternate embodiment of contact panel 100 shown in Fig. 2 A and Fig. 2 B.In the present embodiment, the area of first touch points 600 is greater than shown in Fig. 2 A and Fig. 2 B and be covered in simultaneously on X-axis induction refining X6 and the X7.X-axis induction refining X-axis induced signal x6 and x7 that X6 and X7 exported are higher than first reference value 700 simultaneously.Shown in Fig. 2 C, X-axis induced signal x7 is higher than X-axis induced signal x6, so coordinate computing module 430 will judge that at first the position of X-axis induction chain X7 is the position of first touch points, 600 central points, but not only like this; Coordinate computing module 430 will calculate the gap on the numerical value between X-axis induced signal x6 and the x7 and adjust the X-axis coordinate of first touch points, 600 central points according to result of calculation.In other words, the X-axis coordinate of first touch points, 600 central points that finally calculate of computing module 430 will be between the center of X-axis induction refining X6 and X7.Similarly, the Y-axis coordinate of first touch points, 600 central points that finally calculate of computing module 430 will be between the center of Y-axis induction refining Y2 and Y3.
In addition, calculating first touch points 600 first behind the central point on the X-axis, coordinate computing module 430 captures adjacent to one or several X-axis induced signals of X-axis induced signal x7 and uses interpolation method, dispersion method or other computing methods with exact position and the coordinate of further calculating first touch points 600 central points on X-axis.Similarly, the Y-axis induced signal adjacent to Y-axis induced signal y3 will be used for further calculating the exact position of first touch points, 600 central points on Y-axis.In the present embodiment, coordinate computing module 430 uses X-axis induced signal x6 and x8 adjacent to X-axis induced signal x7 to confirm first position of touch points 600 on X-axis, but is not limited thereto; The difference that coordinate computing module 430 also can add between other X-axis induced signals and the x7 is further confirmed first position of touch points 600 on X-axis.Similarly, the Y-axis induced signal outside Y-axis induced signal y2, y3 and the y4 is to can be used for calculating first position of touch points 600 on Y-axis.Can learn that by above narration even first touch points 600 has unfixed area, computing module 430 also can be proofreaied and correct the central point of obtaining out first touch points 600 according to the amplitude of sense of continuity induction signal and the double counting of center position.
Figure 3 shows that another embodiment of contact panel shown in Fig. 2 A.As shown in Figure 3, the user of contact panel 100 forms first touch points 600 and second touch points 610 by touching on contact panel 100.In the present embodiment, contact panel 100 comprises the first reference value 700 and second reference value 710, corresponds respectively to the X-axis induced signal of X-axis induction refining and the Y-axis induced signal of Y-axis induction refining.First touch points 600 and second touch points 610 come down to arrange along X-axis induction chain X7, and the X-axis induced signal x7 of therefore corresponding X-axis induction chain X7 is higher than first reference value 700.In addition, because the X-axis induced signal x7 of corresponding X-axis induction chain X7 and X8, x8 is higher than respectively and is lower than first reference value 700, so therefore coordinate computing module 430 judges that X7 is the X-axis position of touch points.At this moment, because coordinate computing module 430 does not calculate all Y-axis standings as yet, therefore can't judge at this whether contact panel 100 exists single or plural touch points.
In addition, first touch points 600 and second touch points 610 are to lay respectively on Y-axis induction chain Y3 and the Y5, the Y-axis induced signal y3 of therefore corresponding Y-axis induction chain Y3 and Y5, and y5 is higher than second reference value 710.Because Y-axis induction refining Y4 is not covered by first touch points 600 and second touch points 610, the Y-axis induced signal y4 of therefore corresponding Y-axis induction refining Y4 is lower than second reference value 710.After calculating all X-axis induced signals and Y-axis induced signal, coordinate computing module 430 will be learnt the Y-axis induced signal y3 of corresponding Y-axis induction chain Y3 and Y4, y4 be respectively greater than and less than second reference value 710, and the location determination of therefore simultaneously Y-axis being responded to chain Y3 is the Y-axis position of first touch points 600.Similarly, the position of Y-axis induction chain Y5 also is judged as the Y-axis position of second touch points 610.At this moment, after obtaining the Y-axis position, coordinate computing module 430 will judge respectively the center of first touch points 600 and second touch points 610 be respectively (X7, Y3) and (X7, Y5) and reach function of multi-spot touch thus.In addition, can use interpolation method, dispersion method or additive method with further calculating first touch points 600 and 610 exact positions on X-axis and Y-axis of second touch points adjacent to the X-axis induced signal of X-axis induced signal x7 and after in acquisition adjacent to the Y-axis induced signal of Y-axis induced signal y3 and y5.Contact panel 100 is the center coordinates that are used to detect first touch points 600 and second touch points 610 in the present embodiment, but is not limited thereto; In different embodiment, contact panel 100 also can be used for detecting the touch points center coordinate of other numbers.
Fig. 4 A is depicted as the alternate embodiment of contact panel shown in Fig. 2 A.Contact panel comprises plural X-axis differential values Δ x2, Δ x3, Δ x4, Δ x5, Δ x6, Δ x7, Δ x8 and plural Y-axis differential values Δ y2, Δ y3, Δ y4, Δ y5, Δ y6, Δ y7, Δ y8.In preferred embodiment, all X-axis differential values and Y-axis differential values can be exported in the same time point in first period simultaneously.Please also refer to Fig. 2 B and Fig. 4 A, in the present embodiment, it is right that per one or two adjacent X-axis induction chain will be allocated to an inductor, and wherein each inductor centering X-axis induction X-axis induced signal that chain produced will be used for calculating the X-axis differential values; And the above-mentioned X-axis differential values X-axis induced signal that to be two adjacent X-axis induction chain export at same time point is poor; In other words, the X-axis differential values is being represented between the adjacent two X-axis induction chain signal difference distance at same time point X-axis induced signal.For instance, the X-axis differential values Δ x2 corresponding to X-axis induction chain X2 is X-axis induced signal x2 between X-axis induction chain X2 and X1, the gap of x1.Similarly, the induction that pluralizes of Y-axis induction chain is right, and the Y-axis differential values Δ y2 of wherein for example corresponding Y-axis induction chain Y2 is Y-axis induced signal y2 between Y-axis induction chain Y2 and Y1, the gap of y1.
In addition, the calculating of differential wave can be used for getting rid of the assorted function of believing of environment in the present embodiment.Please refer to Fig. 2 B, Fig. 4 A and following formula (1) at this, wherein N is the assorted letter of environment:
(x2+N)-(x1+N)＝x2-x1＝Δx2 (1)
Can learn at this, calculate that contact panel 100 can effectively be got rid of the assorted letter of the common mode composition (Common-mode Noise) that institute may comprise in two induced signals by formula (1), reach the signal to noise ratio of lifting contact panel signal Processing by differential wave.
In addition, in the embodiment shown in Fig. 4 A, contact panel 100 is set a first reference value 700, is defined as when induction X-axis that centering comprises induction chain is not covered by first touch points 600, and above-mentioned adjacent X-axis is responded to the poor of interchain X-axis influence value.In the present embodiment, when the X-axis induction chain of induction centering is not contained by first touch points 600, the X-axis influence value that two X-axis induction chain is exported is essentially equal, and also therefore this induction is essentially zeroly to pairing X-axis differential values and first reference value 700, but is not limited thereto; In different embodiment, first reference value 700 also can comprise other suitable numerical value.
Please be at this simultaneously with reference to Fig. 2 A and Fig. 4 A, wherein owing to X-axis induction chain X8 is not covered by first touch points 600, therefore its corresponding X-axis influence value x8 is the X-axis influence value x7 less than X-axis induction chain X7, and the X-axis differential values Δ x8 of also therefore corresponding X-axis induction chain X8 is a negative value.When coordinate computing module 430 is received the X-axis differential values that analog-digital converter 420 transmits and come, will find the X-axis differential values Δ x7 of corresponding X-axis induction chain X7 and X8, Δ x8 is respectively greater than reaching less than first reference value 700.X-axis differential values Δ x7, Δ x8 is produced X-axis influence value x6 to X6 and X7 and X-axis induction refining to X7 and X8 by X-axis induction refining, x7 and x8 wherein because X-axis induction refining X7 is repeated on above-mentioned two pairs of X-axis induction refining, therefore are chosen as the position of first touch points 600 in X-axis.According to the relation of above-mentioned X-axis induction refining, coordinate computing module 430 is the X-axis position of first touch points, 600 central points with the pairing X-axis induction of a Δ x7 bigger in two X-axis differential values chain X7 determining positions.Similarly, the coordinate computing module 430 of Fig. 4 A illustrated embodiment also will be according to the Y-axis differential values Δ y3 of corresponding Y-axis induction chain Y3 and Y4, the pairing Y-axis induction of high value Δ y3 refining Y3 selects the position Y-axis coordinate of first touch points 600 among the Δ y4, so the position of Y-axis induction chain Y3 is defined as the Y-axis coordinate of first touch points, 600 central points.At last, the coordinate that coordinate computing module 430 will be judged first touch points according to above-mentioned X-axis differential values and Y-axis differential values for (X7, Y3) and reach the function of single-point touch thus.Can learn that by top narration in the present embodiment, X-axis differential values and the Y-axis differential values obtained according to two adjacent X-axis induced signals are as X-axis coordinate and the Y-axis coordinate of detecting first touch points 600, but not single induced signal.In other words, judgement data and the acquisition mode thereof as detecting first touch points 600 foundations can change to some extent because of the difference of embodiment.
In addition, in the embodiment shown in Fig. 4 A, the calculating that inductor centering is responded to choosing of chain and differential values is according to (X
n-X
N-1) formula carry out.For instance, X-axis differential values Δ x2 is obtained from X-axis is responded to the X-axis induced signal x2 that chain X2 exported to subtract each other the X-axis induced signal x1 that is exported in X-axis induction chain X1, but is not limited thereto.In addition, in the embodiment shown in Fig. 4 A, contact panel 100 is set a threshold values 800, and wherein threshold values 800 is to be used to avoid contact panel 100 to have influence on the detecting of touch points because of the assorted letter of environment of operation.In the present embodiment, though X-axis differential values Δ x7 and Δ x8 be respectively greater than and less than first reference value 700, the difference of one of them and first reference value 700 must be greater than threshold values at least for above-mentioned two differential values.Have only and satisfy above-mentioned two conditions, coordinate computing module 430 can be the X-axis coordinate of first touch points 600 with the location determination of X-axis induction refining X7.Must be by setting difference greater than the condition of threshold values 800, contact panel 100 can be avoided believing or the touch points erroneous judgement that quantization error (Quantization error) causes because of environment is assorted.Thus, the assorted letter of environment for use is higher than first reference value 700, and coordinate computing module 430 also can reduce the chance that detects wrong touch points because of assorted letter.
Fig. 4 B is depicted as the alternate embodiment shown in Fig. 4 A, and wherein the differential values of Fig. 4 A and Fig. 4 B illustrated embodiment is to calculate with different formula.In the present embodiment, the calculating of differential values is according to (X
N-1-X
n) formula carry out; In other words, the account form of Fig. 4 B illustrated embodiment differential values and sampling direction are in contrast to Fig. 4 A illustrated embodiment, therefore judge that the mode of touch points coordinate is also in contrast to Fig. 4 A illustrated embodiment.Shown in Fig. 4 B, contact panel comprises plural X-axis differential values Δ x1, Δ x2, Δ x3, Δ x4, Δ x5, Δ x6, Δ x7 and plural Y-axis differential values Δ y1, Δ y2, Δ y3, Δ y4, Δ y5, Δ y6, Δ y7.For instance, when X-axis differential wave Δ x6 and Δ x7 be respectively less than and greater than first reference value 700, and coordinate computing module 430 will judge after the relation that records X-axis differential wave Δ x6 and Δ x7 and first reference value that it is the X-axis coordinate of first touch points 600 that X-axis is responded to the position of refining X7.Except the account form of differential values, contact panel 100 shown in Fig. 4 B comes down to be same as contact panel 100 shown in Fig. 4 A, does not therefore add at this and gives unnecessary details.
In addition, in the embodiment shown in Fig. 4 A and Fig. 4 B, the acquisition mode of X-axis differential wave is with all the X-axis induction X-axis induced signal that chain produced input analog-digital converters 420, also exports the X-axis differential wave for analog-digital converter 420 automatically according to the X-axis induced signal.For example, X-axis induced signal x1 and x2 are the same time point input analog-digital converters 420 in first period, produce X-axis differential values Δ x2 for analog-digital converter 420.Similarly, Y-axis induced signal y4 and y5 import analog-digital converter 420 to produce Y-axis differential values Δ y5 in the same time point of first period.In the present embodiment, analog-digital converter 420 alternatives one arise from first time point of first period and export all X-axis differential waves or export the X-axis differential wave respectively in the different time points of first period.
Fig. 4 C is depicted as another embodiment of contact panel shown in Fig. 4 A and Fig. 4 B.Wherein present embodiment is according to (X
n-X
N-1) formula calculate X-axis differential values and Y-axis differential values.Shown in Fig. 4 C, the area of first touch points 600 is greater than Fig. 4 A and Fig. 4 B and is covered in simultaneously on X-axis induction refining X6 and the X7, so X-axis differential values Δ x6 and Δ x7 are higher than first reference value 700 simultaneously.Shown in Fig. 2 C, X-axis differential values Δ x7 is higher than X-axis differential values Δ x6, therefore coordinate computing module 430 will judge that at first it is position for first touch points, 600 central points that X-axis is responded to the position of chain X7, but coordinate computing module 430 will capture adjacent to the X-axis differential values of X-axis differential values Δ x7 and use interpolation method, dispersion method or other computing methods with the exact position of further calculating first touch points, 600 central points on X-axis afterwards.Similarly, the Y-axis differential values adjacent to Y-axis differential values Δ y3 will be used for further calculating first exact position of touch points 600 on Y-axis.Can learn that by above narration even first touch points 600 has unfixed area, computing module 430 also can calculate the central point exact position of first touch points 600 according to continuous and adjacent differential values.
Figure 5 shows that another embodiment of contact panel shown in Fig. 4 A, wherein the user forms first touch points 600 and second touch points 610 by touching on contact panel 100.As shown in Figure 5, contact panel 100 comprises the first reference value 700 and second reference value 710, corresponds respectively to X-axis differential values Δ x2, Δ x3, Δ x4, Δ x5, Δ x6, Δ x7, Δ x8 and Y-axis differential values Δ y2, Δ y3, Δ y4, Δ y5, Δ y6, Δ y7, Δ y8.First touch points 600 and second touch points 610 come down to arrange along X-axis induction chain X7, and the X-axis differential values Δ x7 of therefore corresponding X-axis induction chain X7 is higher than first reference value 700.In addition, because the X-axis differential values of corresponding X-axis induction chain X7 and X8 is Δ x7, Δ x8 is higher than respectively and is lower than first reference value 700, so therefore coordinate computing module 430 judges that X7 is the X-axis position of touch points.At this moment, because coordinate computing module 430 does not calculate all Y-axis differential values as yet, therefore can't judge at this whether contact panel 100 exists a plurality of touch points.
In addition, first touch points 600 and second touch points 610 lay respectively on Y-axis induction chain Y3 and the Y5, the Y-axis differential values Δ y3 of therefore corresponding Y-axis induction chain Y3 and Y5, and Δ y5 is higher than second reference value 710.Because Y-axis induction chain Y4 and Y6 are not covered by first touch points 600 and second touch points 610, the Y-axis differential values Δ y4 of therefore corresponding Y-axis induction chain Y4 and Y6, Δ y6 is lower than second reference value 710.Utilize X-axis differential values and Y-axis differential values, coordinate computing module 430 will be learnt the Y-axis differential values Δ y3 of corresponding Y-axis induction chain Y3 and Y4, Δ y4 be respectively greater than and less than second reference value 710, and the location determination of therefore simultaneously Y-axis being responded to chain Y3 is the Y-axis position of first touch points 600.Similarly, the position of Y-axis induction chain Y5 also is judged as the Y-axis position of second touch points 610.At this moment, after obtaining the Y-axis coordinate, the position that coordinate computing module 430 will be judged first touch points 600 and second touch points 610 respectively for (X7, Y3) and (X7, Y5) and learn multi-point touch thus.In addition, can use interpolation method, dispersion method or additive method with further calculating first touch points 600 and 610 exact positions on X-axis and Y-axis of second touch points adjacent to the X-axis differential values of X-axis differential values Δ x7 and after in acquisition adjacent to the Y-axis differential values of Y-axis differential values Δ y3 and Δ y5.Contact panel 100 is the center coordinates that are used to detect first touch points 600 and second touch points 610 in the present embodiment, but is not limited thereto; In different embodiment, contact panel 100 also can be used for detecting the touch points center coordinate of other numbers.
Figure 6 shows that the block diagram of touch detection method of the present invention.As shown in Figure 6, touch detection method comprises step S900, and a contact panel is provided, and comprises plural number side by side axial induction device in regular turn, and wherein each this axial induction device is exported an induced signal.In the present embodiment, contact panel is a capacitance type touch-control panel that comprises plural axial induction refining, and wherein each axial induction refining comprises independently plural but interconnective axial induction device.User's touch-control will change the integral capacitor of axial induction device and the refining of corresponding axial induction, and change the induced signal that the axial induction refining is exported simultaneously, but be not limited thereto; In different embodiment, contact panel of the present invention also comprises the contact panel of electric resistance touch-control panel, sound wave type contact panel or other kinds.
Touch detection method comprises S910 in addition, according to the induced signal that the axial induction device is exported, produces plural judgement data.In the present embodiment, the induced signal that above-mentioned axial induction refining is exported becomes the self simulation formal transformation to digital form to be handled for the coordinate computing module, and wherein induced signal is to refine one of them corresponding to plural axial induction in regular turn.As shown in Figure 6, step S920 comprise when two adjacent judgement data be respectively greater than and during less than a reference value, according to judging that data institute respective shaft determines a touch points to position of inductor.When last adjacent two induced signals of order be respectively greater than and during less than a reference value, one of them senses touching at least to represent the corresponding axial induction refining of induced signal institute.In the present embodiment, in two induced signals amplitude one of higher the position of corresponding axial induction refining will be judged as the position of touch points, wherein alternative by acquisition and use interpolation method, dispersion method or additive method simultaneously further to calculate the position of touch points adjacent to other induced signals of this induced signal.Can be according near the central shaft position, continuous judgement data calculates touches coordinate more accurately, but is not limited thereto; In different embodiment, under different elements and framework, in above-mentioned two induced signals amplitude one of lower the position of corresponding axial induction refining also can be used as the judgment basis of touch-controlled shaft position.
In addition, plural axial induction refining is arranged in X-direction group and Y direction group respectively and is respectively applied for and obtained at least one touch-control coordinate to determine a touch point.Axial induction refining in the present embodiment is divided into X-axis induction refining and the Y-axis induction refining that plural number intersects, and exports plural X-axis induced signal and Y-axis induced signal respectively.When the user touches the axial induction refining, the coordinate computing module will be obtained an at least one X-axis coordinate and a Y-axis coordinate respectively and judge the position that touch point takes place according to above-mentioned coordinate in X-axis induced signal and Y-axis induced signal.In addition, in the present embodiment, X-axis induction refining and Y-axis induction refining are to intersect each other in orthogonal mode, but are not limited thereto; In different embodiment, X-axis induction refining and Y-axis induction refining can also other angles intersect each other.
Figure 7 shows that another embodiment of touch detection method shown in Figure 6.In the present embodiment, touch detection method comprises step S1000 in addition, set a threshold values and step S1010, when the difference of one of them and reference value is greater than threshold values at least, determine touch points to position of inductor according to two adjacent judgement data institute respective shaft in two adjacent judgement data.The general average amplitude of setting greater than assorted letter (Noise) in the environment of operation of threshold values among the step S1000.In the present embodiment, though order go up adjacent induced signal be simultaneously greater than and less than reference value, above-mentioned induced signal one of them the amplitude and the difference of reference value at least need be greater than threshold values.Thus, touch detection method of the present invention is avoided arriving in fact non-existent touch points because of the assorted letter error detection of environment of operation by the setting of threshold values.
Figure 8 shows that the alternate embodiment of touch detection method shown in Figure 6, wherein the touch detection method of present embodiment comprises step S1100, and it is right in regular turn two adjacent axial induction devices to be distributed into plural inductor.In the present embodiment, it is right that each two adjacent axial induction refines induction of composition.For instance, have 8 side by side axial induction refinings in regular turn as the contact panel of present embodiment, it is right that step S1100 will be distributed into 7 inductions to above-mentioned 8 axial inductions refining.Step S1110 comprises and obtains the difference of each inductor to the induced signal of comprising of axial induction refining.In the present embodiment, the axial induction signal that each induction centering axial induction refining is produced will be imported analog-digital converter simultaneously, wherein analog-digital converter will be according to receiving that the difference between the axial induction signal exports a differential values, and differential values is above-mentioned two axial induction gaps of refining the axial induction signal of exporting in same time point.Among the step S920 in the present embodiment, differential values is intended for the foundation of judging the touch points coordinate, wherein when two adjacent differential values be respectively greater than and during less than a reference value, determine a touch points according to one of them institute's respective shaft of differential values to position of inductor.In the present embodiment, the said reference value is to be 0, but is not limited thereto.
Though aforesaid description and diagram have disclosed preferred embodiment of the present invention, must recognize variously increase, many modifications and replace and may be used in preferred embodiment of the present invention, and can not break away from the spirit and the scope of the principle of the invention that defines as appended claim.Be familiar with this skill person and can know from experience the modification that the present invention may be used in a lot of forms, structure, layout, ratio, material, element and assembly.Therefore, this paper, should be regarded as in order to explanation the present invention in all viewpoints in embodiment that this disclosed, but not in order to restriction the present invention.Scope of the present invention should be defined by the attached claim in back, and contains its legal equivalents, is not limited to previous description.
Claims (12)
1. touch detection method comprises the following step:
One contact panel is provided, comprises plural number side by side axial induction device in regular turn, wherein each this axial induction device is exported an induced signal;
These induced signals of exporting in one first period according to these axial induction devices produce plural judgement data, in regular turn corresponding to these axial induction devices one of them or in regular turn corresponding to the plural inductor that constitutes by adjacent these axial induction devices to one of them;
When two these adjacent judgement data be respectively greater than and during less than a reference value, according to these judgement data institute these axial induction devices of correspondence or right determining positions one touch points of these inductors.
2. touch detection method as claimed in claim 1, wherein this touch points deciding step comprises
Two these adjacent judgement data be respectively greater than and during less than this reference value, determine a touching coordinate of this touch points at least according at least two these judgement data.
3. touch detection method as claimed in claim 1, wherein should judgement data calculation procedure be contained in one first time point of this first period and obtain the difference of each this inductor comprise of these induced signals of these axial induction devices, as in regular turn to should plural inductor to one of them these judgement data.
4. touch detection method as claimed in claim 1, wherein this contact panel provides step to comprise according to a first direction and a second direction these axial induction devices is arranged in a first direction group and a second direction group respectively, and wherein this first direction is to intersect at this second direction; And
This touch points obtains step and comprises from this first direction group and this second direction group and obtain at least one touching coordinate respectively to determine this touch points.
5. touch detection method as claimed in claim 1, wherein this touch points obtains step and further comprises the following step:
Set a threshold values;
When these two these adjacent judgement data be respectively greater than and during less than this reference value, judge these two adjacent these judgement data at least the difference of one of them and this reference value whether greater than this threshold values; And
When these two adjacent these judgement data at least the difference of one of them and this reference value be during greater than this threshold values, according to these two adjacent these judgement data corresponding these axial induction devices or right this touch points of determining positions of these inductors.
6. touch detection method as claimed in claim 1, wherein this touch points obtains step and further comprises the following step:
Set a threshold values;
When these two these adjacent judgement data be respectively greater than and during less than this reference value, whether the difference of judging these two adjacent these judgement data and this reference value respectively all greater than this threshold values; And
The variation value of judging data when these two adjacent these is with the difference of this reference value during all greater than this threshold values, according to these two adjacent these judgement data these axial induction devices of correspondence or right this touch points of location determination of these inductors.
7. contact panel comprises:
One axial induction group comprises plural number side by side axial induction device in regular turn, and wherein each this axial induction device is exported an induced signal; And
One signal processing module, be electrically connected at this axial induction group to receive these induced signals of these axial induction devices, these induced signals that this signal processing module is exported in one first period according to these axial induction devices produce plural judgement data, in regular turn corresponding to these axial induction devices one of them or in regular turn corresponding to the plural inductor that constitutes by adjacent these axial induction devices to one of them;
When two these adjacent judgement data be respectively greater than and during less than a reference value, this signal processing module will according to these judgement data to should axial induction device or right determining positions one touch points of these inductors.
8. contact panel as claimed in claim 7, wherein when two these adjacent judgement data be respectively greater than and during less than this reference value, this signal processing module is a touching coordinate that determines this touch points according at least two these judgement data.
9. contact panel as claimed in claim 7, wherein these induced signals of these axial induction devices in the difference of one first time point of this first period be as in regular turn to should plural inductor to one of them these judgement data.
10. contact panel as claimed in claim 7, wherein these axial induction devices are arranged in a first direction group and a second direction group with a first direction and a second direction respectively, wherein this first direction is to intersect at this second direction, and this signal processing module is obtained at least one touching coordinate respectively to determine this touch points from this first direction group and this second direction group.
11. contact panel as claimed in claim 7, wherein this signal processing module comprises a threshold values, when these two these adjacent judgement data are respectively greater than reaching less than this reference value, and these two adjacent these judgement data are when the difference of one of them and this reference value is greater than this threshold values at least, this signal processing module will according to these two adjacent these judgement data this touch points of determining positions of corresponding these axial induction devices.
12. contact panel as claimed in claim 7, wherein this signal processing module comprises a threshold values, when these two these adjacent judgement data are respectively greater than reaching less than this reference value, and the difference of these two adjacent these judgement data and this reference value is during all greater than this threshold values, this signal processing module will according to these two adjacent these judgement data this touch points of determining positions of corresponding these axial induction devices.
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| US9830030B2 (en) | 2015-05-07 | 2017-11-28 | Industrial Technology Research Institute | Flexible touch panel, touch control device and operating method using the same |
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| CN107728864B (en) * | 2012-08-30 | 2021-05-04 | 禾瑞亚科技股份有限公司 | Capacitive sensor and detection method thereof |
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Application publication date: 20110928 |