CN101882041B - Capacitive touch screen for improving edge touch sensitive accuracy and data processing method thereof - Google Patents
Capacitive touch screen for improving edge touch sensitive accuracy and data processing method thereof Download PDFInfo
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Abstract
The invention relates to a capacitive touch screen for improving the edge touch sensitive accuracy and a method for eliminating edge effect by compensating coordinate data of a touch position. The touch screen comprises plate electrode groups in the same plane or belonging to different planes, and under normal working conditions, the plate electrode groups form equivalent capacitance arrays by mutual orthogonal of rectangular strip-shaped equivalent plate electrodes in the plane of the touch screen. The width of the equivalent plate electrodes positioned at the edge of the touch screen in theequivalent capacitance arrays is smaller than the width of the equivalent plate electrodes which are positioned in the middle of the touch screen and arranged along the same direction of the equivalent plate electrodes. The invention reduces the width of the equivalent plate electrodes at the edge, increases the information quantity retrievable by the touch action on the edge of the touch screen,improves the sensitivity of the edge of the touch screen, reduces the error of center coordinate data, and solves the problem of edge effect of the touch screen; and in addition, by applying the method for compensating the coordinate data of the touch position provided by the invention, the touch accuracy at the edge of the touch screen is further improved.
Description
Technical field
The present invention relates to touch action is changed the input media of capable telecommunications number, particularly relate to the input media that the detecting touch action causes capacitance variations, i.e. capacitive touch screen.
Background technology
Capacitive touch screen comprises self-capacitance touch-screen and mutual capacitance touchscreens, be that the action that the ultimate principle of utilizing human body or special-purpose touching device to change capacitance will be touched screen is converted to electric signal, this electric signal is treated as touching regional center position coordinate data by data processing module with described electric signal, to corresponding messaging device, this messaging device comprises computing machine, palm PC, is commonly called as mobile communication terminal and the video/audio playback equipment of mobile phone as the input data transmission.Described capacitive touch screen is included in the same plane or is separately positioned on the battery lead plate group who adheres to different layers in the Different Plane separately, forms capacitor array by pumping signal in touch screen surface.Described self-capacitance touch-screen is to utilize the self-capacitance of the formation between battery lead plate and the equipotential shielding pole plate to constitute described capacitor array; Described mutual capacitance touchscreens is that the mutual capacitance that utilizes battery lead plate to form each other constitutes described capacitor array.They just form the basic physical principle difference of capacitor array, and its essence effect is identical.
The most basic battery lead plate group arrangement form shown in Fig. 6-1 and Fig. 6-2, described battery lead plate comprise the strip shaped electric poles plate 10 of parallel longitudinal ' with laterally parallel strip shaped electric poles plate 20 ', described longitudinal electrode plate 10 ' with transverse electric pole plate 20 ' orthogonal.For self-capacitance formula touch-screen, shown in Fig. 6-1, all battery lead plates all be electrically connected pumping signal module 80 ', thereby described battery lead plate and equipotential guarded electrode plate 30 ' between electric field action under form capacitor array.Described equipotential guarded electrode plate 30 ' general ground connection or connect DC source.For the mutual capacitance type touch-screen, longitudinal electrode plate 10 ' and 20 ' two kinds of battery lead plates of transverse electric pole plate in any be electrically connected pumping signal module 80 ', another kind of battery lead plate electrical connection sensing control module 90 ', be electrically connected pumping signal module 80 ' battery lead plate be called the drive electrode plate, be electrically connected sensing control module 90 ' battery lead plate be called the sensing electrode plate, for example, shown in Fig. 6-2, longitudinal electrode plate 10 ' electrical connection pumping signal module 80 ', transverse electric pole plate 20 ' electrical connection sensing control module 90 ', thus under the electric field action between two kinds of battery lead plates, form capacitor array.Prior art is for the sensitivity of the detecting touch action that improves touch-screen and be convenient to data and handle, through updating, battery lead plate group arrangement form is varied, and the shape of battery lead plate has no longer sticked to strip, and fork also passes between the battery lead plate.For example, for the self-capacitance touch-screen, shown in Fig. 6-3, each battery lead plate of described battery lead plate group is designed to rhombus, and the grouping of each battery lead plate is connected into many strip electrodes chain along diagonal, and each strip electrode chain separately longitudinally or lateral arrangement, electrode chains 11 ' parallel to each other longitudinally, horizontal electrode chains 21 ' also parallel to each other, arbitrary longitudinal electrode chain and arbitrary transverse electrode chain are orthogonal, all electrode chains all be electrically connected pumping signal module 80 '.Again for example, Chinese patent application 200810171009 discloses a kind of mutual capacitance touchscreens, its battery lead plate can be designed to rectangle, square and rhombus, Fig. 6-4 illustrates the rectangular situation of a kind of battery lead plate in this application, the battery lead plate 13 that lontitudinal series is arranged ' be rectangle, the battery lead plate 23 of horizontal arranged in series ' be square, described rectangular electrode plate 13 ', 23 ' be connected into longitudinal electrode chain group and the transverse electrode chain group of mutually orthogonal, wherein one group be electrically connected pumping signal module 80 ', so another group just be electrically connected sensing control module 90 ', its principal feature is, described battery lead plate complementation does not exist battery lead plate over against situation.
No matter the battery lead plate of described capacitive touch screen is mined massively with the concrete structure of which kind of form, which kind of difference the electric field that forms has, data processing module for described capacitive touch screen all has same effect, angle and the logical perspective of handling from data just, shown in Fig. 7-1, the effect that described capacitive touch screen finally reaches be exactly form by longitudinally equivalent electrode plate 14 of strip rectangle ' with the equivalent capacity array 40 that constitutes along horizontal equivalent electrode plate 24 ' quadrature ', all equivalent electrode plate 14 ', 24 ' width all be identical.Described equivalent electrode plate longitudinally 14 ' with along horizontal equivalent electrode plate 24 ' the square of cross section be exactly an equivalent capacity 41 '.Described data processing module records the appearance value of each electric capacity of this equivalence capacitor array when the touch action that does not have to take place to touch-screen as benchmark; When the touch action that takes place touch-screen, described data processing module detects the variation that each capacitance of capacitor array of being caused by touching takes place, and handles the coordinate data that forms the touch position central point with described benchmark comparison and then through data.Shown in Fig. 7-2, when touch action takes place when, touch action to described equivalent capacity array 40 ' influence all be zonal, just in a zone equivalent capacity array 40 ' in a zone in equivalent capacity 41 ' the appearance value will change.Fig. 7-2 illustrates the zone of T1, the generation touching of T2 two places, the variation of the more close representative capacitance of hacures is more big, can obviously find out, in the above-mentioned two touching zones, equivalent capacitance value the closer to the touching center changes more greatly, and more little in the variation of the equivalent capacitance value of touching edges of regions.Prior art can calculate the coordinate that the touch position regional center takes place substantially accurately by interpolation algorithm.
But the prior art touch-screen all is subjected to the edge effect influence.For the touch action that takes place at the touch-screen edge, the prior art touch-screen often exists touch action reflection sensitivity decline, the touching centre coordinate that data processing module forms and the actual center defective devious that touch position takes place.Shown in Fig. 7-3, T3 is the touching zone that a place occurs in touch-screen middle part touch action, and T4 is the touching zone that a place occurs in touch-screen edge touch action.Since touch-screen do not had outward can be touched the equivalent capacity of action influence, the shared actual area of touch action can not be detected by complete, cause the zone of the touch action covering equivalent capacity array that takes place at the touch-screen edge little than the middle part, the quantity of information that data processing module obtains is little, through experimental test, the closer to the touch-screen fringe region, the deviation that data are handled the actual generation touch action of the touch action center position coordinates center that forms is more big, and the direction of deviation all is trend touch-screen middle part.At present, prior art does not also have method or the device of the above-mentioned touch-screen edge effect of fine solution.
Summary of the invention
The technical problem to be solved in the present invention is to avoid the deficiencies in the prior art part and proposes effectively to solve the capacitive touch screen of raising edge touch sensitive accuracy of touch-screen edge effect and the data processing method that is used for this touch-screen.
The present invention solve the technical problem can be by realizing by the following technical solutions:
Design, a kind of capacitive touch screen that improves edge touch sensitive accuracy of manufacturing, be included in the same plane or adhere to the battery lead plate group of Different Plane separately, under normal operation, described battery lead plate group forms the equivalent capacity array that the equivalent electrode plate mutually orthogonal by rectangular strip forms on plane, touch-screen place, especially, be positioned at the width of equivalent electrode plate at touch-screen edge in the described equivalent capacity array less than the equivalent electrode plate width of arranging along equidirectional with this equivalence battery lead plate that is positioned at the touch-screen middle part.
Described battery lead plate group comprises the battery lead plate of lontitudinal series and the battery lead plate of laterally connecting, be positioned at the transverse width of battery lead plate of lontitudinal series at touch-screen edge less than the transverse width of the battery lead plate of the lontitudinal series that is positioned at touch-screen middle part, be positioned at vertical width of battery lead plate of horizontal series connection at touch-screen edge less than vertical width of the battery lead plate of the horizontal series connection that is positioned at touch-screen middle part, so that the equivalent electrode plate width that is positioned at the touch-screen edge in the described equivalent capacity array is less than the equivalent electrode plate width of arranging along equidirectional with this equivalence battery lead plate that is positioned at the touch-screen middle part.
On the such scheme basis, among the described battery lead plate group each battery lead plate at touch-screen edge and in the spacing between the middle electrode plate less than the spacing between the middle electrode plate, so that the equivalent electrode plate width that is positioned at the touch-screen edge in the described equivalent capacity array is less than the equivalent electrode plate width of arranging along equidirectional with this equivalence battery lead plate that is positioned at the touch-screen middle part.
Particularly, described touch-screen is included in the same plane or adheres to driving layer and the sensing layer of Different Plane separately, and described battery lead plate group comprises drive electrode plate and sensing electrode plate; Described driving layer includes, drive electrode plate spaced apart in same plane; Described sensing layer includes, sensing electrode plate spaced apart in same plane; Described each sensing electrode plate is distributed in the sensing layer, and with drive in the zone that the mutual void area of each drive electrode plate faces described in the layer, make described drive electrode plate and sensing electrode plate fill the touch area of described touch-screen together; Described drive electrode plate is electrically connected with the pumping signal module of touch-screen peripheral hardware, and described sensing electrode plate is electrically connected with the sensing control module of touch-screen peripheral hardware.
The present invention solve the technical problem can be by realizing by the following technical solutions:
Implement a kind of touch position coordinates data that compensate to eliminate the method for edge effect, capacitive touch screen based on above-mentioned raising edge touch sensitive accuracy, this touch-screen is included in the same plane or adheres to the battery lead plate group of Different Plane separately, under normal operation, described battery lead plate group forms the equivalent capacity array that the equivalent electrode plate mutually orthogonal by rectangular strip forms on plane, touch-screen place, be positioned at the equivalent electrode plate area at touch-screen edge in the described equivalent capacity array less than the equivalent electrode plate area that is positioned at the touch-screen middle part; Especially described method comprises the steps:
A. according to the capacitance variations data that detect from touch-screen, with the interpolation algorithm deal with data with the interpolated coordinates data that obtain taking place the touch location center (x ', y ');
B. with the described interpolated coordinates data of steps A (x ', y ') in the interpolation border, is mapped in the whole touch screen, thereby eliminate the interpolation border to the coordinate data clear area between the touch-screen border, reduced the error of interpolation border to the magnification region border simultaneously, obtain the touch location center coordinate data (x, y).
Particularly, described step B also comprises step by step following:
B1. interpolated coordinates data that obtain according to steps A (x ', y ') determine to take place horizontal ordinate X1 and the ordinate Y1 on the border of touch location center magnification region of living in the interpolation border respectively;
B2. according to
x＝(1-k1)×X1+kx′，y＝(1-k2)×Y1+ky′
With described interpolated coordinates data (x ', y ') be treated to the touch location center coordinate data (x, y), wherein,
Xaa, Yaa are respectively horizontal ordinate and the ordinates on the touch-screen border of the most close interpolated coordinates point (x ', y '), and Xc, Yc are respectively horizontal ordinate and the ordinates on the interpolation border of the most close interpolated coordinates point (x ', y ').
Compare with prior art, the technique effect that the present invention " improves capacitive touch screen and the data processing method thereof of edge touch sensitive accuracy " is:
The present invention makes the reduced width of edge equivalent electrode plate, has increased the touch-screen edge to the retrievable quantity of information of touch action, has improved the sensitivity at touch-screen edge, reduces the error of centre coordinate data, has solved the edge effect problem of touch-screen; In addition, use the method for the compensation touch position coordinates data of the present invention's proposition, make touch-screen action center position coordinate data more accurate.
Description of drawings
Fig. 1 is the synoptic diagram of the present invention's " capacitive touch screen of raising edge touch sensitive accuracy " first embodiment, comprises,
Fig. 1-the 1st, the synoptic diagram of the equivalent capacity array 300 of described first embodiment;
Fig. 1-2 is described first embodiment equivalent electrode plate 200 distributions longitudinally and edge touching synoptic diagram;
Fig. 1-the 3rd, prior art touch-screen equivalent electrode plate 14 ' distribution longitudinally and edge touching synoptic diagram;
Fig. 2 is the battery lead plate group's 100 of second embodiment of the invention distribution schematic diagram;
Fig. 3 is the battery lead plate group's 100 of third embodiment of the invention distribution schematic diagram;
Fig. 4 is the battery lead plate group's 100 of fourth embodiment of the invention distribution schematic diagram;
Fig. 5 is the coordinate data synoptic diagram of fifth embodiment of the invention;
Fig. 6 is the electrode group distribution plan of prior art capacitive touch screen, comprising:
Fig. 6-the 1st, the electrode group distribution schematic diagram of prior art self-capacitance touch-screen;
Fig. 6-the 2nd, the electrode group distribution schematic diagram of prior art mutual capacitance touchscreens;
Fig. 6-the 3rd, the electrode group distribution schematic diagram of prior art rhombus battery lead plate touch-screen;
Fig. 6-the 4th, the electrode group distribution schematic diagram of prior art rectangular electrode plate touch-screen;
Fig. 7 is the equivalent capacity array synoptic diagram of prior art capacitive touch screen, comprising:
Fig. 7-the 1st, described equivalent capacity array synoptic diagram;
Fig. 7-the 2nd is at prior art capacitive touch screen middle part touch action synoptic diagram;
Fig. 7-the 3rd, touch action causes the synoptic diagram of edge effect at the prior art capacitive touch screen.
Embodiment
Be described in further detail below in conjunction with the accompanying drawing illustrated embodiment.
The present invention proposes a kind of capacitive touch screen that improves edge touch sensitive accuracy, be included in the same plane or adhere to the battery lead plate group 100 of Different Plane separately, under normal operation, as shown in Figure 1, described battery lead plate group forms the equivalent capacity array 300 that equivalent electrode plate 200 mutually orthogonals by rectangular strip form on plane, touch-screen place.Be positioned at the width of equivalent electrode plate 220 at touch-screen edge in the described equivalent capacity array 300 less than equivalent electrode plate 210 width of arranging along equidirectional with this equivalence battery lead plate 220 that are positioned at the touch-screen middle part.
As Figure 1-1, described equivalent capacity array 300 is formed by the strip rectangular equivalent battery lead plate 200 that extends longitudinally and the strip rectangular equivalent battery lead plate 200 that extends transversely, the described strip rectangular equivalent battery lead plate 200 that extends longitudinally is parallel to each other, the described strip rectangular equivalent battery lead plate 200 that extends transversely is also parallel to each other, and Fig. 1-2 shows the distribution situation of the described strip rectangular equivalent battery lead plate 200 that extends longitudinally.The described strip rectangular equivalent battery lead plate that extends longitudinally 200 is orthogonal with the strip rectangular equivalent battery lead plate 200 that extends transversely, and their each intersections partly form an equivalent capacity, thereby form described equivalent capacity array 300.
For better embodiment technique effect of the present invention, we only get the strip rectangular equivalent battery lead plate 200 that all extend longitudinally among first embodiment and describe.Shown in Fig. 1-2 and Fig. 1-3, the indicated scope of T5 refers to same touching zone, represents identical touch action.Fig. 1-2 illustrates the distribution situation of the strip rectangular equivalent battery lead plate 200 that extends longitudinally of first embodiment of the invention, and just the width de of edge two equivalent electrode plate 200 is each positioned at the width dm of the equivalent electrode plate 200 at middle part less than other.Fig. 1-3 illustrate the strip rectangular equivalent battery lead plate 14 that extends longitudinally of prior art touch-screen ' distribution situation, just, all equivalent electrode plate 14 ' width all be d.From Fig. 1-3 as can be seen, by the touch action of T5 indication can cover at the middle part of prior art touch-screen three equivalent electrode plate 14 ', namely mainly change the appearance value of three equivalent capacitys, but, at the edge of this touch-screen by the touch action of T5 indication just cover at most two equivalent electrode plate 14 '.Therefore, in the touch action at touch-screen middle part, the capacitance variations data of formation will be lost a part to the prior art touch-screen, have reduced quantity of information, thereby can reduce the sensitivity to touch action in the touch action at touch-screen edge.First embodiment of the invention, shown in Fig. 1-2, because the width de of the equivalent electrode plate 200 at edge is each positioned at the width dm of the equivalent electrode plate 200 at middle part less than other, not only the touch action of T5 indication can cover three equivalent electrode plate 200 at the middle part of first embodiment of the invention touch-screen, and the touch action of T5 indication also can cover three equivalent electrode plate 200 at the edge of this touch-screen.From the quantity of information aspect that the touch-screen edge detection obtains, technique scheme of the present invention has increased the quantity of information of touch-screen edge collecting than prior art, and the touch-screen edge of enhancing is to the sensitivity of touch action.
In addition, can determine that according to interpolation algorithm the centre coordinate of each equivalent capacity is exactly the geometric center of this equivalence electric capacity, the centre coordinate of the touch action overlay area geometric center that also can be understood as each equivalent capacity of this touch action overlay area touches center after the variable quantity interpolation by the appearance value so.For the prior art touch-screen, shown in figure-1, Q indication dotted line is exactly each equivalent capacity 41 ' geometric center line of edge, use the interpolation algorithm deal with data, the touch action geometric center can not exceed the dotted line scope of Q indication, therefore, Q indication dotted line scope is called as the interpolation border, just, can not be outside the Q of interpolation border with the touch action centre coordinate that interpolation algorithm is handled, if the center reality of touch action is between interpolation border and touch-screen border so, its touch action centre data of handling through interpolation algorithm is also within the Q of interpolation border and this interpolation border of infinite tendency.Obviously, the situation for the touching of this edge is bound to produce data error.First embodiment of the invention shown in Fig. 1-2, because the width de of the equivalent electrode plate 200 at edge is each positioned at the width dm of the equivalent electrode plate 200 at middle part less than other, indicates the interpolation border of dotted line scope with the border of more close touch-screen by P.Therefore, use the interpolation algorithm deal with data equally, the data error that the data error certainty that the present invention causes at the touch-screen edge causes less than prior art touch-screen edge.From data processing aspect, technique scheme of the present invention has reduced data error than prior art.
Below be that example specifies technique scheme with the mutual capacitance touchscreens, thereby make equivalent electrode plate 220 width that are positioned at the touch-screen edge in the described equivalent capacity array 300 less than equivalent electrode plate 210 width of arranging along equidirectional with this equivalence battery lead plate 220 that are positioned at the touch-screen middle part.
Below three embodiment all relate to a kind of comparatively complicated battery lead plate group arrangement, these three embodiment all be a kind of battery lead plate mutually not over against complementation electrode plate structure mutual capacitance touchscreens.Described touch-screen is included in the same plane or adheres to driving layer and the sensing layer of Different Plane separately, and described battery lead plate group 100 comprises drive electrode plate and sensing electrode plate; Described driving layer includes, drive electrode plate spaced apart in same plane; Described sensing layer includes, sensing electrode plate spaced apart in same plane; Described each sensing electrode plate is distributed in the sensing layer, and with drive in the zone that the mutual void area of each drive electrode plate faces described in the layer, make described drive electrode plate and sensing electrode plate fill the touch area of described touch-screen together; Described drive electrode plate is electrically connected with the pumping signal module of touch-screen peripheral hardware, and described sensing electrode plate is electrically connected with the sensing control module of touch-screen peripheral hardware.Described drive electrode plate and sensing electrode plate are the identical battery lead plates of physical property, they separately the difference of title for no other reason than that they have been electrically connected different modules respectively, as mentioned above, when battery lead plate was electrically connected the pumping signal module, this battery lead plate was exactly the drive electrode plate; When battery lead plate was electrically connected the sensing control module, this battery lead plate was exactly the sensing electrode plate.
Second embodiment of the invention, as shown in Figure 2, described battery lead plate group 100 in same plane, i.e. single-layer electrodes plate group structure.All battery lead plates all assume diamond in shape, described battery lead plate group 100 comprises the battery lead plate of lontitudinal series and the battery lead plate of laterally connecting, be positioned at the transverse width dye of battery lead plate 112 of lontitudinal series at touch-screen edge less than the transverse width dym of the battery lead plate 111 of the lontitudinal series that is positioned at touch-screen middle part, be positioned at vertical width dxe of battery lead plate 122 of horizontal series connection at touch-screen edge less than vertical width dxm of the battery lead plate 121 of the horizontal series connection that is positioned at touch-screen middle part, this structure can realize making equivalent electrode plate 220 width that are positioned at the touch-screen edge in the described equivalent capacity array 300 less than equivalent electrode plate 210 width of arranging along equidirectional with this equivalence battery lead plate 220 that are positioned at the touch-screen middle part.Said structure can be understood as does " cutting " with the edge electrodes plate of prior art touch-screen, and it is than the incomplete battery lead plate of touch-screen middle electrode plate that the edge electrodes plate " is cut ".Note also the directivity of described " cutting ", for the battery lead plate of longitudinally connecting, laterally " cutting " can not influence the width of the equivalent electrode plate of its formation, should be with vertical " cutting " to change the transverse width of battery lead plate; In like manner, for along the battery lead plate of laterally connecting, should adopt horizontal " cutting " to change vertical width of battery lead plate.Said structure it is also understood that on prior art touch-screen basis, increases the touch-screen middle part transverse width of series electrical pole plate longitudinally, and reduces this touch-screen edge transverse width of series electrical pole plate longitudinally; Increase the touch-screen middle part along vertical width of horizontal series electrical pole plate, and reduce laterally vertical width of series electrical pole plate of this edge, touch-screen edge.Because the final effect of described second embodiment will make equivalent electrode plate 220 width that are positioned at the touch-screen edge less than equivalent electrode plate 210 width of arranging along equidirectional with this equivalence battery lead plate 220 that are positioned at the touch-screen middle part, so the technical scheme of second embodiment can obtain technique effect of the present invention.As mentioned above, for mutual capacitance touchscreens, if described pumping signal module is electrically connected all lontitudinal series battery lead plates, described lontitudinal series battery lead plate is exactly the drive electrode plate, described sensing control module is electrically connected all horizontal series electrical pole plates, and described horizontal series electrical pole plate is exactly the sensing electrode plate; Otherwise if described pumping signal module is electrically connected all horizontal series electrical pole plates, described horizontal series electrical pole plate is exactly the drive electrode plate, and described sensing control module is electrically connected all lontitudinal series battery lead plates, and described lontitudinal series battery lead plate is exactly the sensing electrode plate;
Third embodiment of the invention, as shown in Figure 3, described battery lead plate group 100 in two Different Plane, i.e. two-layer electrode plate group structure.All battery lead plates all assume diamond in shape, as mentioned above, described battery lead plate group 100 comprises the battery lead plate of lontitudinal series and the battery lead plate of laterally connecting, be positioned at the transverse width dye of battery lead plate 112 of lontitudinal series at touch-screen edge less than the transverse width dym of the battery lead plate 111 of the lontitudinal series that is positioned at touch-screen middle part, be positioned at vertical width dxe of battery lead plate 122 of horizontal series connection at touch-screen edge less than vertical width dxm of the battery lead plate 121 of the horizontal series connection that is positioned at touch-screen middle part, make equivalent electrode plate 220 width that are positioned at the touch-screen edge in the described equivalent capacity array 300 less than equivalent electrode plate 210 width of arranging along equidirectional with this equivalence battery lead plate 220 that are positioned at the touch-screen middle part.
Fourth embodiment of the invention, as shown in Figure 4, described battery lead plate group 100 in two Different Plane, i.e. two-layer electrode plate group structure.All battery lead plates are all rectangular, and described battery lead plate not only width changes, and the gap of edge electrodes plate and middle electrode plate also changes.For the battery lead plate width, as mentioned above, be positioned at the transverse width dye of battery lead plate 112 of lontitudinal series at touch-screen edge less than the transverse width dym of the battery lead plate 111 of the lontitudinal series that is positioned at touch-screen middle part, be positioned at vertical width dxe of battery lead plate 122 of horizontal series connection at touch-screen edge less than vertical width dxm of the battery lead plate 121 of the horizontal series connection that is positioned at the touch-screen middle part.Simultaneously, for the battery lead plate gap, among the described battery lead plate group 100 each battery lead plate 112 at touch-screen edge, 122 and at the spacing dse between the middle electrode plate 111,121 less than the spacing dsm between the middle electrode plate 111,121.Under the acting in conjunction of structure aspect above-mentioned two, make equivalent electrode plate 220 width that are positioned at the touch-screen edge in the described equivalent capacity array 300 less than equivalent electrode plate 210 width of arranging along equidirectional with this equivalence battery lead plate 220 that are positioned at the touch-screen middle part.Certainly, if do not change the width of edge electrodes plate, and only change the gap of edge electrodes plate and middle electrode plate, be among the described battery lead plate group 100 each battery lead plate 112 at touch-screen edge, 122 and at the spacing dse between the middle electrode plate 111,121 less than the spacing dsm between the middle electrode plate 111,121, can make equivalent electrode plate 220 width that are positioned at the touch-screen edge in the described equivalent capacity array 300 less than equivalent electrode plate 210 width of arranging along equidirectional with this equivalence battery lead plate 220 that are positioned at the touch-screen middle part equally.
The battery lead plate of the various embodiments described above can use transparent conductive material, and this transparent conductive material comprises tin indium oxide IndiumTin Oxide, is called for short ITO, and antimony-doped tin oxide Antimony Tin Oxide, is called for short ATO.
Preamble is mentioned, and touch-screen of the present invention can only reduce the error of the touch action center position coordinates data that cause because of edge effect, still, can not eliminate this error.For this reason, the present invention also proposes a kind of touch position coordinates data that compensate with the method for further elimination edge effect, based on the capacitive touch screen that improves edge touch sensitive accuracy, this touch-screen is included in the same plane or adheres to the battery lead plate group 100 of Different Plane separately, under normal operation, described battery lead plate group 100 forms the equivalent capacity array 300 that equivalent electrode plate 200 mutually orthogonals by rectangular strip form on plane, touch-screen place, be positioned at equivalent electrode plate 220 areas at touch-screen edge in the described equivalent capacity array 300 less than equivalent electrode plate 210 areas that are positioned at the touch-screen middle part.Described method comprises the steps:
A. according to the capacitance variations data that detect from touch-screen, with the interpolation algorithm deal with data with the interpolated coordinates data that obtain taking place the touch location center (x ', y ');
B. with the described interpolated coordinates data of steps A (x ', y ') in the interpolation border, is mapped in the whole touch screen, thereby eliminate the interpolation border to the coordinate data clear area between the touch-screen border, reduced the error of interpolation border to the magnification region border simultaneously, obtain the touch location center coordinate data (x, y).
As mentioned above, described interpolation border refers to handle to obtain to be in the coordinate data with interpolation algorithm the coordinate data combination of frontier point, for the equivalent capacity array, is exactly the border that the line of edge equivalent capacity central point forms.
Said method can be amplified to the coordinate data in the P of interpolation border in the whole touch screen zone, thereby eliminates the error that the touch-screen edge effect causes substantially.
Particularly, described step B also comprises step by step following:
B1. interpolated coordinates data that obtain according to steps A (x ', y ') determine to take place horizontal ordinate X1 and the ordinate Y1 on the border of touch location center magnification region of living in the interpolation border respectively;
B2. according to
x＝(1-k1)×X1+kx′，y＝(1-k2)×Y1+ky′
With described interpolated coordinates data (x ', y ') be treated to the touch location center coordinate data (x, y), wherein,
Xaa, Yaa are respectively horizontal ordinate and the ordinates on the touch-screen border of the most close interpolated coordinates point (x ', y '), and Xc, Yc are respectively horizontal ordinate and the ordinates on the interpolation border of the most close interpolated coordinates point (x ', y ').
Below specify the concrete implementation of the method for the invention step B and principle thereof by an embodiment.
The key of above-mentioned disposal route is to obtain the mapping ratio.For this reason, fifth embodiment of the invention, as shown in Figure 5, very routine with the equivalent electric that extends longitudinally based on the capacitive touch screen of raising edge touch sensitive accuracy of the present invention, present embodiment is example with the horizontal ordinate of handling coordinate data only.Earlier touch-screen edge equivalent electrode plate 220 is replenished in data are handled, the width after it is replenished reaches the width of touch-screen middle part equivalent electrode plate 210.Suppose to be positioned at through the centre coordinate data (x ', y ') that interpolation algorithm is handled the back touch action zone of Far Left equivalent electrode plate 220.As shown in Figure 5, X0 be replenish the most close behind the edge electrodes plate 220 (x ', the left margin horizontal ordinate of capacitor array y '), Xaa be the most close interpolated coordinates point (x ', the horizontal ordinate on touch-screen border y '), Xc is the horizontal ordinate of the interpolation border left margin of the most close interpolated coordinates point (x ', y '), the interpolation border when the interpolation border here refers to that all equivalent electrode plate width all equate.Because (x ', y ') be positioned at left hand edge battery lead plate 220, the right margin X1 that just determines left hand edge battery lead plate 220 is the horizontal ordinate of determining to take place border of magnification region of living in the interpolation border, touch location center.Suppose that Px is the normal width of the equivalent electrode plate 210 at touch-screen middle part, dx is the value that the equivalent electrode plate width at touch-screen edge reduces than Px, thus, (Px-dx) is exactly the width of edge equivalent electrode plate 220, (Px/2-dx) be exactly that the interpolation border is to the distance on touch-screen border, i.e. Xc-Xaa.By the interpolated coordinates disposal route, can't calculate Xaa to the numerical value between the Xc, can only obtain the numerical value on Xc the right.In this example, set Xc＞Xaa. and establish coordinate axis for linear, the distance of (Xc-X0) corresponding Px is then arranged.Therefore, obtain
At described the 5th embodiment, only need one section coordinate of the close touch screen center of Xc is amplified to Xaa, just finished this compensation.As mentioned above, Xc is chosen to X1 in the interval of amplification, and the interval after amplifying is that Xaa is to X1.Being located at this interval interpolation calculation horizontal ordinate is x ', and amplifying mapping coordinate afterwards is x, and following formula is just arranged
X=(1-k1) * X1+k1x ', wherein,
Like this, touch screen design parameter Px and dx are arranged, just can finish above-mentioned data and handle.In right side edge equivalent electrode plate 220, and the data handling procedure of ordinate all can be used for reference described the 5th embodiment and realizes for touch position.As seen, choosing of mapping ratio k1, k2 is relevant with the border of magnification region, and the definition magnification region has just defined the mapping ratio.Described magnification region border can be fixed boundary, also can be the immediate magnification region border of determining according to interpolated coordinates (x ', y ').The above embodiment of the present invention is with a border as magnification region, the border of interpolated coordinates (x ', y ') place equivalent electrode plate.So, in the above embodiment of the present invention, magnification region should refer to equivalent electrode plate away from the border of touch screen center and the zone between this touch screen center line.
Claims (1)
1. one kind compensates the touch position coordinates data to eliminate the method for edge effect, based on the capacitive touch screen that improves edge touch sensitive accuracy, this touch-screen is included in the same plane or adheres to the battery lead plate group (100) of Different Plane separately, under normal operation, described battery lead plate group (100) forms the equivalent capacity array (300) that equivalent electrode plate (200) mutually orthogonal by rectangular strip forms on plane, touch-screen place, be positioned at equivalent electrode plate (220) area at touch-screen edge in the described equivalent capacity array (300) less than equivalent electrode plate (210) area that is positioned at the touch-screen middle part; It is characterized in that described method comprises the steps:
A. according to the capacitance variations data that detect from touch-screen, with the interpolation algorithm deal with data with the interpolated coordinates data that obtain taking place the touch location center (x ', y ');
B. the described interpolated coordinates data of steps A (x ', y ') are mapped in the whole touch screen in the interpolation border, thereby eliminate the interpolation border to the coordinate data clear area between the touch-screen border, obtain the coordinate data (x at touch location center, y), specifically comprise step by step following
B1. interpolated coordinates data that obtain according to steps A (x ', y ') determine to take place horizontal ordinate X1 and the ordinate Y1 on the border of touch location center magnification region of living in the interpolation border respectively;
B2. according to
x＝(1-k1)×X1+k1x′，y＝(1-k2)×Y1+k2y′
With described interpolated coordinates data (x ', y ') be treated to the touch location center coordinate data (x, y), wherein,
Xaa, Yaa are respectively horizontal ordinate and the ordinates on the touch-screen border of the most close interpolated coordinates point (x ', y '), and Xc, Yc are respectively horizontal ordinate and the ordinates on the interpolation border of the most close interpolated coordinates point (x ', y ').
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