Embodiment
The below describes embodiments of the invention in detail, and the example of described embodiment is shown in the drawings, and wherein identical or similar label represents identical or similar element or the element with identical or similar functions from start to finish.Be exemplary below by the embodiment that is described with reference to the drawings, only be used for explaining the present invention, and can not be interpreted as limitation of the present invention.
The embodiment of the invention has proposed a kind of self-capacitance detection mode of novelty, when sensing unit is touched, the touch point can be divided into this sensing unit two resistance, is carrying out considering when self-capacitance detects that these two resistance just can determine the position of touch point on this sensing unit.As shown in Figure 3, be the detection principle schematic of embodiment of the invention contactor control device.When this sensing unit of finger touch, will be equivalent to this sensing unit is divided into two resistance, the resistance of these two resistance is relevant with the position of touch point.For example, as described in Figure, when touch point and the first electrode were nearer, then resistance R 1 was just less, and resistance R 2 is just larger; Otherwise when touch point and the second electrode were nearer, then resistance R 1 was just larger, and resistance R 2 is just less.Therefore, the present invention just can determine the position of touch point on this sensing unit by the detection to resistance R 1 and R2.In an embodiment of the present invention, detect in several ways resistance R 1 and R2, for example can be by in the current detection value, self-capacitance detected value, level signal detected value and the charge variation amount that detect the first electrode and the second electrode one or more, thus resistance R 1 and R2 obtained according to these detected values.And the measurement of the present invention by the self-capacitance that is formed by the touch point being carried out charge to offset some immeasurablel physical parameter for twice or reduce physical quantity improves measuring accuracy.
Need to prove, in an embodiment of the present invention, above-mentioned the first electrode is identical with the function of the second electrode, and the two can exchange, therefore in the above-described embodiments, both can also can be from the second electrode detection from the first electrode detection, if can satisfy in charging, discharge or when detecting needs electric current is arranged through the first resistance and this requirement of the second resistance.
In an embodiment of the present invention, can apply corresponding voltage to a plurality of sensing units successively in the mode of scanning, when detecting, also can detect successively in the mode of scanning simultaneously.
As shown in Figure 4, be the touch detecting method process flow diagram of the embodiment of the invention, this process flow diagram together describes in conjunction with schematic diagram shown in Figure 3.The method may further comprise the steps:
Step S401, one in described a plurality of sensing units in the first electrode of a sensing unit and the second electrode applies high level signal, and with another ground connection in described the first electrode and the second electrode, carry out the charging first time with the self-capacitance that when sensing unit is touched, sensing unit is produced.In this embodiment, in the first electrode and the second electrode applies high level signal Vcc.
If this moment, this sensing unit was pointed or other objects touches, then this sensing unit will produce self-capacitance C1 (with reference to Fig. 3), therefore just can charge to self-capacitance by the high level signal Vcc that applies.At this moment, in one embodiment of the invention, if apply high level signal to the first electrode, the voltage that then is applied on the self-capacitance is V2=VccR2/ (R1+R2).In one embodiment of the invention, if apply high level signal to the second electrode, the voltage that then is applied on the self-capacitance is V1=VccR1/ (R1+R2).
In addition, in an embodiment of the present invention, by the charging to self-capacitance, can also improve the accuracy of detection of self-capacitance.
In one embodiment of the invention, if this sensing unit is not touched, then follow-uply will detect very little self-capacitance, therefore can judge that it is not touched.
Step S402 is with the first electrode of a described sensing unit and at least one ground connection in the second electrode, self-capacitance is carried out the discharge first time.Particularly, can be with the first electrode and the equal ground connection of the second electrode; Perhaps, with the first electrode grounding, and the second electrode disconnects; Perhaps, with the second electrode grounding, and the first electrode disconnects, self-capacitance is carried out the discharge first time.
Step S403 detects to obtain for the first time charging and the first change detected value between the discharge for the first time from the first electrode of correspondence or the second electrode.In an embodiment of the present invention, described correspondence refers to following situation, for example, when the first electrode of a sensing unit and the equal ground connection of the second electrode are discharged, all can detect from the first electrode and the second electrode; As when the first electrode grounding, when the second electrode disconnects, then can only be from the first electrode detection; Otherwise, when the second electrode grounding, when the first electrode disconnects, then can only be from the second electrode detection.
In the present embodiment, suppose that the first change detected value is Δ Q1.Below be described as the charge variation amount as example take the first change detected value and the second change detected value, but can reaction resistance R1 and other change detected values of R2 Relations Among, also all can adopt such as level signal, electric current etc.
Wherein, if in step 401, apply high level signal to the first electrode, then Δ Q1=V2C1=VccC1R2/ (R1+R2) (1a).Wherein, V2=VccR2/ (R1+R2), the voltage of self-capacitance was V2 when charged this moment for the first time, this self-capacitance voltage can detect when charging for the first time or calculate.
Wherein, if in step 401, apply high level signal to the second electrode, then Δ Q1=V1C1=VccC1R1/ (R1+R2) (1b).Wherein, V1=VccR1/ (R1+R2), the voltage of self-capacitance was V1 when charged this moment for the first time, this self-capacitance voltage can detect when charging for the first time or calculate.
Step S404, one in the first electrode of a sensing unit in described a plurality of sensing units and the second electrode applies high level signal, and with another disconnection in described the first electrode and described the second electrode, self-capacitance is carried out the charging second time.
In embodiments of the present invention, can apply high level signal to the first electrode, and the second electrode disconnects; Perhaps, the second electrode is applied high level signal, and the first electrode disconnects.Be pointed out that in addition, because the high level signal that applies is known quantity, so the amplitude of the high level signal that applies for twice can be identical or not identical, all do not affect derivation.In this embodiment, to the first electrode or the second electrode apply with step S401 in identical high level signal Vcc, the voltage that then is applied on the self-capacitance this moment is Vcc.
Step S405 is with the first electrode of a described sensing unit and at least one ground connection in the second electrode, self-capacitance is carried out the discharge second time.Particularly, can be with the first electrode and the equal ground connection of the second electrode; Perhaps, with the first electrode grounding, and the second electrode disconnects; Perhaps, with the second electrode grounding, and the first electrode disconnects.
Step S406 detects to obtain for the second time charging and the second change detected value between the discharge for the second time from the first electrode of correspondence or the second electrode.In the present embodiment, suppose that the second change detected value is Δ Q2.The second change detected value need adopt the change detected value identical with the first change detected value among the step S403, namely is in embodiments of the present invention the charge variation amount.Similarly, said " corresponding " also be relative concept, for example when discharging for the second time, if the second electrode disconnects, then can only detect from the first electrode.
Wherein, Δ Q2=VccC1 (2)
Step S407, according to the first resistance between the first change detected value and the second change detected value calculating self-capacitance to the first electrode and the proportionate relationship of the second resistance between self-capacitance to the second electrode, and according to the definite touch location that touches object (for example finger) of the proportionate relationship of the first resistance and the second resistance.In one embodiment of the invention, the represented self-capacitance charge variation amount in through type (1a) (or 1b) and (2) can calculate the proportionate relationship of R1 and R2, because the regular linear of figure relation, then can calculate the position of the horizontal ordinate at place, touch point, and the position at self-capacitance C1 place.In an embodiment of the present invention, if sensing unit is door shape sensing unit or L shaped sensing unit, then just can determine touch location on touch-screen to describe in detail below with reference to concrete example by the ratio between the first resistance and the second resistance.But in other embodiments of the invention, if sensing unit is rectangle sensing unit or snakelike (but see on the whole be equivalent to rectangle) sensing unit, then step S407 can only calculate the touch location on the touch-screen first direction, and this first direction can be the length direction (for example horizontal direction of touch-screen) of sensing unit.
If sensing unit is rectangle sensing unit or snakelike (but see on the whole be equivalent to rectangle) sensing unit, then also need the touch location of location positioning on second direction according to sensing unit.In one embodiment of the invention, first direction is the length direction of sensing unit, and second direction is the direction perpendicular to sensing unit, and sensing unit is horizontally disposed with or vertically arranges.
In an embodiment of the present invention, if in step 401, apply high level signal to the first electrode, therefore R1/R2=(Δ Q2-Δ Q1)/Δ Q1 then just can obtain proportionate relationship between R1 and the R2 by the embodiment of the invention.
In an embodiment of the present invention, if in step 401, apply high level signal to the second electrode, therefore R1/R2=Δ Q1/ (Δ Q2-Δ Q1) then just can obtain proportionate relationship between R1 and the R2 by the embodiment of the invention.
Be pointed out that; the above-mentioned charge and discharge process first time (step S401-step S403) the and for the second time order of charge and discharge process (step S404-step S406) can intermodulation; namely carry out first step S404-step S406; carry out again step S401-step S403; do not depart from too thought of the present invention, be included within protection scope of the present invention.
In an embodiment of the present invention, the self-capacitance detection module can be at present known self-capacitance detection module, does not therefore repeat them here.
In one embodiment of the invention, if adopt two self-capacitance detection modules, then because two self-capacitance detection modules can share a plurality of devices, therefore can not increase the overall power of chip.
In one embodiment of the invention, sensing unit can take different shapes.Preferably, a plurality of disjoint sensing units are positioned at same layer, thereby in the situation that guarantees accuracy of detection, can greatly save cost.
As shown in Figure 5, the synoptic diagram that is touched for the rectangle sensing unit of the embodiment of the invention.This sensing unit is rectangle, and the first direction of a plurality of sensing unit and described touch-screen is parallel to each other, so touch location is the touch location on first direction.
Shown in Fig. 6 a, be the sensing unit structural drawing of one embodiment of the invention.This sensing unit 200 comprises a plurality of firsts 230 and a plurality of parallel second portions 240, wherein, link to each other by second portion 240 between the adjacent first 230, with the first groove 1000 and the second groove 2000 that forms a plurality of alternative arrangements, wherein, the opening direction of a plurality of the first grooves 1000 and a plurality of the second grooves 2000 is opposite.Preferably, second portion 240 is arranged along first direction.In one embodiment of the invention, a plurality of firsts 230 can be parallel to each other, also can be not parallel.And preferably, second portion 240 is rectangle.In other embodiments of the invention, first 230 also can be rectangle, but first 230 also can be other various shape.In this embodiment, by the impedance of first's 230 increase resistance, thus the impedance that increases sensing unit 200, so that the first resistance and the easier detection of the second resistance improve accuracy of detection further.And in this embodiment, preferably, the interval between the second portion 240 is equal, thereby can improve equably from the impedance of sensing unit, to improve accuracy of detection.In one embodiment of the invention, first direction is the length direction of sensing unit 200, and second direction is the direction perpendicular to sensing unit 200, and particularly, sensing unit 200 can be horizontally disposed with or vertically arrange.
In an embodiment of the present invention, the size of sensing unit 200 length directions and the size of substrate are basically identical, so contactor control device is simple in structure, make easily, and low cost of manufacture.
In one embodiment of the invention, the first electrode 210 and the second electrode 220 link to each other with two firsts in a plurality of firsts 230 respectively.The first electrode 210 and the second electrode 220 link to each other with two second portions in a plurality of second portions 240 respectively, shown in Fig. 6 b but in another embodiment of the present invention.
And in an embodiment of the present invention, mutually vertical between second portion 240 and the first 230, the angle between the two is preferably 90 degree, certainly also can select other angles.Shown in Fig. 6 a, this sensing unit 200 joins end to end a plurality of firsts 230 by a plurality of second portions 240, and the first electrode 210 of sensing unit 200 links to each other with the first 230 at two ends respectively with the second electrode 220.On one-piece construction, this sensing unit 200 is for having the rectangle than the aspect ratio.This need to prove, although in Fig. 6 a with sensing unit 200 along the X-axis setting, it will be understood by those skilled in the art that this sensing unit 200 also can be along the Y-axis setting.Structure by this sensing unit is noise reduction effectively, improves the linearity of induction.
Shown in Fig. 7 a, be the sensing unit structural drawing of another embodiment of the present invention.In this embodiment, this sensing unit 200 can be a shape, and the length of each sensing unit 200 is different in a plurality of sensing unit 200, and is mutually nested between a plurality of sensing units 200.Wherein, each described sensing unit comprises third part 250, disjoint the 4th part 260 and the 5th part 270.Preferably, third part 250 is parallel with the first side 110 of substrate 100, the 4th part 260 is parallel with the Second Edge 120 of substrate 100 with the 5th part 270, and the 4th part 260 1 ends link to each other with an end of third part 250, and an end of the 5th part 270 links to each other with the other end of third part 250.The other end that the other end of the 4th part 260 of sensing unit 200 has the first electrode 210, the five parts 270 has the second electrode 220, and wherein, each first electrode 210 all links to each other with the corresponding pin of touch-screen control chip with the second electrode 220.
In an embodiment of the present invention, the so-called mutually nested sensing unit in the outside that refers to partly surrounds inboard sensing unit, for example shown in Fig. 7 a, can reach larger coverage rate when guaranteeing precision like this, and reduce the complexity of computing, improve the response speed of touch-screen.Certainly those skilled in the art also can adopt according to the thought of Fig. 7 a other mutually nested modes to arrange sensing unit.In one embodiment of the invention, the third part 250 of each sensing unit 200 is parallel with the third part 250 of other sensing units 200, the 4th part 260 of each sensing unit 200 is parallel with the 4th part 260 of other sensing units 200, and the 5th part 270 of each sensing unit 200 is parallel with the 5th part 270 of other sensing units 200.In one embodiment of the invention, at least one is rectangle in the third part 250 of sensing unit 200, the 4th part 260 and the 5th part 270, and preferably, third part 250, the 4th part 260 and the 5th part 270 are rectangle.In this embodiment because rectangular configuration figure rule, therefore finger laterally or when vertically moving the linearity good, in addition, the spacing between two rectangular configuration is identical, is convenient to calculate, thereby improves computing velocity.
In one embodiment of the invention, the 4th part 260 of each sensing unit 200 and the 5th part 270 equal in length.
In one embodiment of the invention, substrate 100 is rectangle, and is mutually vertical between first side 110 and the Second Edge 120, and mutually vertical between the 4th part 260 and the third part 250, mutually vertical between the 5th part 270 and the third part 250.
In one embodiment of the invention, spacing between the third part 250 of adjacent two sensing units 200 equates, spacing between the 4th part 260 of adjacent two sensing units 200 equates that the spacing between the 5th part 270 of adjacent two sensing units 200 equates.So just can evenly divide by first side 110 and the Second Edge 120 of 200 pairs of touch-screens of a plurality of sensing units, thereby improve arithmetic speed.Certainly in other embodiments of the invention, the spacing between the third part 250 of adjacent two sensing units 200 also can be unequal, and perhaps, the spacing between the 4th part 260 of adjacent two sensing units 200 also can be unequal, shown in Fig. 7 b.For example, because the user often touches the centre of touch-screen, therefore the spacing between the sensing unit at touch screen center position can be reduced, thereby improve the accuracy of detection in centre.
In one embodiment of the invention, a plurality of sensing units 200 are symmetrical with respect to the central shaft Y of substrate 100, and shown in Fig. 7 a, central shaft Y is perpendicular to third part 250, thereby more is conducive to improve precision.
Shown in Fig. 7 a, in this embodiment, the first electrode 210 and second electrode 220 of sensing unit 200 all are positioned on the first side 110 of substrate 100.In this embodiment, detect after the touch location on sensing unit, can obtain the touch location on touch-screen.
Need to prove that above-mentioned Fig. 7 a is the more excellent embodiment of the present invention, it can obtain larger coverage rate, but other embodiment of the present invention can carry out the variation that some are equal to Fig. 7 a, and for example the 4th part 260 and the 5th part 270 can be uneven.
The structure of the sensing unit employing similar door shape in the embodiment of the invention, not only simple in structure, to be convenient to make, institute is leaded all together on one side, and it is convenient to design, and reduces silver-colored slurry cost and making easily, and Decrease production cost is had very great help.
Synoptic diagram when being touched for the sensing unit of the embodiment of the invention as shown in Figure 8.As can be seen from Figure 8, the first electrode is 210, the second electrode is 220, touch location is close to the second electrode, the length of supposing sensing unit is 10 unit lengths, and sensing unit is divided into 10 parts equably, wherein, the length of sensing unit third part 250 is 4 unit lengths, and the length of sensing unit the 4th part 260 and the 5th part 270 is 3 unit lengths.Through detecting, the ratio of knowing the first resistance and the second resistance is 4: 1, and namely the first electrode 210 to the length (being embodied by the first resistance) of touch location is 80% of whole sensing unit length.In other words, the touch point is positioned at the position of 8 unit lengths in distance the first electrode 210 places, knows, the touch point is positioned at the position of 2 unit lengths in distance the second electrode 220 places.When finger was mobile, therefore the corresponding movement of touch location meeting just can judge the corresponding motion track of finger by the conversion of touch location, thereby judged user's input instruction.
Can find out that from the above example of Fig. 8 account form of the present invention is very simple, therefore can greatly improve the reaction velocity that touch-screen detects.In an embodiment of the present invention, usually finger or other objects can touch a plurality of sensing units, can obtain first in a plurality of sensing units that this is touched the touch location of each this moment, then calculate final touch location on touch-screen by the mode that is averaging.
Shown in Fig. 9 a, be another embodiment Touch-screen testing equipment structural drawing of the present invention.In one embodiment of the invention, the length of a plurality of sensing units increases gradually, and each described sensing unit comprises the 6th part 280 and the 7th part 290.The end that one end of the 6th part 280 has the first electrode 210, the seven parts 290 links to each other with the other end of the 6th part 280, and the other end of the 7th part 290 has the second electrode 220.
Particularly, the 6th part 280 is parallel with the first side 110 of substrate 100, and the 7th part 290 is parallel with the Second Edge 120 of substrate 100, and first side 110 is adjacent with Second Edge 120.And each first electrode 210 all links to each other with the corresponding pin of touch-screen control chip with the second electrode 220.
In a preferred embodiment of the invention, the 6th part 280 of each sensing unit 200 is parallel with the 6th part 280 of other sensing units 200, and the 7th part 290 of each sensing unit 200 is parallel with the 7th part 290 of other sensing units 200.Can effectively improve sensing unit to the coverage rate of touch-screen by such setting.In one embodiment of the invention, at least one is rectangle in the 6th part 280 of sensing unit 200, the 7th part 290, and preferably, the 6th part 280, the 7th part 290 are rectangle.In this embodiment because rectangular configuration figure rule, therefore finger laterally or when vertically moving the linearity good, in addition, the spacing between two rectangular configuration is identical, is convenient to calculate.
Sensing unit in the touch screen detection device of the embodiment of the invention adopts both-end to detect, the two ends that are sensing unit all have electrode, and each electrode all links to each other with the corresponding pin of touch-screen control chip, can realize location to the touch point touching when detecting by sensing unit self.
What is more important, the present invention realizes determining of touch location by calculating the first resistance and the second resistance ratio, therefore with respect to present rhombus or triangular design, because when determining touch location, need not to calculate the size of self-capacitance, and the size of self-capacitance can not affect the precision of touch location, the dependence of self-capacitance accuracy of detection is reduced, thereby improved measuring accuracy, improved the linearity.In addition, any one all can be the rectangle of regular shape because in the 5th part 270, the 6th part 280 and the 7th part 290 of the embodiment of the invention, therefore with respect to irregular shapes such as present rhombus or triangles, also can improve further the linearity.
In one embodiment of the invention, the 6th part 280 of each sensing unit and the 7th part 290 equal in length, thus can improve arithmetic speed.Preferably, substrate 100 is rectangle, and is mutually vertical between first side 110 and the Second Edge 120.First side 110 is mutually vertical with Second Edge 120, not only so that the sensing unit design is more regular, for example so that also mutually vertical between the 6th part 280 of sensing unit and the 7th part 290, thereby improve the coverage rate to touch-screen, and mutually vertically also can improve the linearity of detection between the 6th part 280 and the 7th part 290.
In one embodiment of the invention, the spacing between adjacent two sensing units 200 equates.So just can evenly divide by first side 110 and the Second Edge 120 of 200 pairs of touch-screens of a plurality of sensing units, thereby improve arithmetic speed.
Certainly in another embodiment of the present invention, spacing between adjacent two sensing units 200 can not wait yet, shown in Fig. 9 b, for example because the user often touches the centre of touch-screen, therefore the spacing between the sensing unit at touch screen center position can be reduced, thereby improve the accuracy of detection in centre.
Shown in Fig. 9 a, in this embodiment, the first electrode 210 of sensing unit 200 is positioned on the first side 110 of substrate 100, and the second electrode 220 is positioned on the Second Edge 120 of substrate 100, and first side 110 is mutually vertical with Second Edge 120.In this embodiment, detect after the touch location on sensing unit, can obtain the touch location on touch-screen.
Synoptic diagram when being touched for the sensing unit of the embodiment of the invention as shown in figure 10.As can be seen from Figure 10, the first electrode is 210, the second electrode is 220, touch location is close to the second electrode 220, the length of supposing sensing unit is 10 unit lengths, and sensing unit is divided into 10 parts equably, wherein, the length of the 6th part 280 of sensing unit is 5 unit lengths, and the length of the 7th part 290 of sensing unit is 5 unit lengths.Through detecting, the ratio of knowing the first resistance and the second resistance is 9: 1, and namely the first electrode 210 to the length (being embodied by the first resistance) of touch location is 90% of whole sensing unit length.In other words, the touch point is positioned at the position of 9 unit lengths in distance the first electrode 210 places, knows, the touch point is positioned at the position of 1 unit length in distance the second electrode 220 places.
Can find out that from the above example of Figure 10 account form of the present invention is very simple, therefore can greatly improve the reaction velocity that touch-screen detects.
In one embodiment of the invention, a plurality of sensing units 200 are positioned at same layer, therefore only need one deck ITO to get final product, thereby when guaranteeing precision, greatly reduce manufacturing cost.
Sensing unit in the touch screen detection device of the embodiment of the invention adopts both-end to detect, the two ends that are sensing unit all have electrode, and each electrode all links to each other with the corresponding pin of touch-screen control chip, can realize location to the touch point touching when detecting by sensing unit self.
What is more important, the present invention realizes determining of touch location by calculating the first resistance and the second resistance ratio, therefore with respect to present rhombus or triangular design, because when determining touch location, need not to calculate the size of self-capacitance, and the size of self-capacitance can not affect the precision of touch location, the dependence of self-capacitance accuracy of detection is reduced, thereby improved measuring accuracy, improved the linearity.In addition, any one all can be the rectangle of regular shape because in the 5th part 270, the 6th part 280 and the 7th part 290 of the embodiment of the invention, therefore with respect to irregular shapes such as present rhombus or triangles, also can improve further the linearity.
In sum, the embodiment of the invention applies level signal by the electrode to the sensing unit two ends, if this sensing unit is touched, then can form self-capacitance by this sensing unit, therefore the present invention can charge to this self-capacitance by the level signal that applies, and determines touch location on first direction according to the proportionate relationship between the first resistance and the second resistance.For example in one embodiment of the invention, proportionate relationship between the first resistance and the second resistance is according to described self-capacitance charge/discharge the time, from described the first electrode and/or the second electrode detects the first detected value of acquisition and the proportionate relationship between the second detected value calculates.The first detected value and the second detected value that produce during therefore from the first electrode and/or this self-capacitance charge/discharge of the second electrode detection.Like this, just can react the position that the touch point is positioned at this sensing unit by the first detected value and the second detected value, thereby determine that further the touch point is in the position of touch-screen.
For the sensing unit of Fig. 5 and Fig. 6, after having determined the touch location on the first direction, also need further the touch location of location positioning on second direction according to the sensing unit that is touched.In an embodiment of the present invention, can be with reference to Fig. 5 and shown in Figure 6, if detect the first detected value of certain sensing unit or the second detected value greater than predetermined threshold value, illustrate that then this sensing unit is touched.Suppose that second sensing unit (its ordinate is M) is touched, then the touch location on second direction just is the coordinate M of second sensing unit.Afterwards, determine the position of touch point on touch-screen according to the touch location on the first direction and the touch location on the second direction again.
Particularly, can adopt centroid algorithm to calculate the touch location of touch point on second direction, below centroid algorithm simply be introduced.
In draw runner and touch pad application, often be necessary more than the essential spacing of concrete sensing unit, to determine the position of finger (or other capacitive object).The touch panel of finger on draw runner or touch pad is usually greater than any sensing unit.In order to adopt the position after touch is calculated at a center, this array is scanned to verify that given sensing station is effectively, be to be greater than default touch threshold for the requirement of the adjacent sensing unit signal of some.After finding the strongest signal, this signal and those greater than the closing signal of touch threshold all for computing center:
Wherein, locate the label of sensing unit centered by the Ncent, n is the number that detects the sensing unit that is touched, and i is the sequence number of sensing unit of being touched, and wherein i is more than or equal to 2.
For example, when finger touch at article one passage, its capacitance change is y1, the capacitance change on the second passage is that the capacitance change on y2 and the 3rd passage is when being y3.Wherein second channel y2 capacitance change is maximum.The Y coordinate just can be at last:
As shown in figure 11, be the contactor control device synoptic diagram of one embodiment of the invention.This contactor control device comprises touch screen detection device, the touch-screen control chip 300 that is made of substrate 100 and a plurality of disjoint sensing unit 200.Wherein, a part of pin in the touch-screen control chip 300 links to each other with the first electrode 210 of a plurality of sensing units 200, another part pin in the touch-screen control chip 300 links to each other with the second electrode 220 of a plurality of sensing units 200, and touch-screen control chip 300 applies level signal to the first electrode 210 and/or second electrode 220 of a plurality of sensing units 200, the self-capacitance charging that this level signal produces to sensing unit 200 when sensing unit 200 is touched.
As shown in figure 12, be the structural drawing of embodiment of the invention touch-screen control chip.Touch-screen control chip 300 comprises charging module 310, discharge module 320, detection module 330 and control and computing module 340.Wherein, charging module 310 is in first time charging process, one in a plurality of sensing units in the first electrode 210 of a sensing unit 200 and the second electrode 220 applies high level signal, and with another ground connection in the first electrode 210 and the second electrode 220, carry out the charging first time with the self-capacitance that when a sensing unit 200 is touched, a sensing unit 200 is produced; In second time charging process, one in the first electrode 210 of a sensing unit 200 in a plurality of sensing units and the second electrode 220 applies high level signal, and with another disconnection in the first electrode 210 and the second electrode 220, self-capacitance is carried out the charging second time.Discharge module 320 is after 310 pairs of self-capacitances of charging module charge for the first time and charge for the second time, with the first electrode 210 of a sensing unit 200 and at least one ground connection in the second electrode 220, self-capacitance is carried out the discharge first time and for the second time discharge.Detection module 330 is used for detecting to obtain for the first time charging and the first change detected value between the discharge for the first time from the first electrode 210 of correspondence or the second electrode 220, and detects to obtain for the second time charging and the second change detected value between the discharge for the second time from the first electrode 210 of correspondence or the second electrode 220.Control and computing module 340 are used for charging module 310, discharge module 320, first detection module 330 and the second detection module 340 are controlled, and calculate the first resistance between self-capacitance to the first electrode and self-capacitance to the proportionate relationship of the second resistance between described the second electrode according to the first detected value and/or the second detected value and the 3rd detected value and/or the 4th detected value, and determine touch location according to the proportionate relationship of the first resistance and the second resistance.In an embodiment of the present invention, control and computing module 340 can be controlled charging module 310 in the mode of scanning and apply corresponding voltage to a plurality of sensing units successively, when detecting, also can detect successively in the mode of scanning simultaneously, the self-capacitance that the mode controlled discharge module 320 that perhaps, also can scan produces the sensing unit that is touched in a plurality of sensing units successively discharges.
In one embodiment of the invention, the first detected value and the second detected value can be one or more in current detection value, self-capacitance detected value, level signal detected value and the charge variation amount.
In one embodiment of the invention, first detection module 330 and the second detection module 340 are CTS (capacitive detection module).
In one embodiment of the invention, control and computing module 340 also are used for the touch location of location positioning on second direction according to the sensing unit 200 that is touched, and determine the position of described touch point on touch-screen according to the touch location on the first direction and the touch location on the second direction.Particularly, control and computing module 340 are determined touch location on the described second direction by centroid algorithm.
In one embodiment of the invention, first direction is the length direction of sensing unit 200, and second direction is the direction perpendicular to sensing unit 200 length directions, and the sensing unit horizontal parallel arranges or the vertical parallel setting.
In a preferred embodiment of the invention, a plurality of disjoint sensing units are positioned at same layer, thereby under the prerequisite that guarantees accuracy of detection, effectively reduce manufacturing cost.
The invention allows for a kind of portable electric appts, comprise aforesaid contactor control device.
The embodiment of the invention applies level signal by the electrode to the sensing unit two ends, if this sensing unit is touched, then this sensing unit can form self-capacitance, therefore the present invention can charge to this self-capacitance by the level signal that applies, and determines touch location on the touch-screen according to the proportionate relationship between the first resistance and the second resistance.And by the detection mode that self-capacitance is carried out twice charging of the embodiment of the invention, offsetting some immeasurablel physical parameter or to reduce the measurement of physical quantity, thereby under the prerequisite that guarantees detection speed, effectively improve accuracy of detection.
The embodiment of the invention has proposed a kind of self-capacitance detection mode of novelty, when sensing unit is touched, the touch point just can be divided into this sensing unit two resistance, thereby is carrying out considering when self-capacitance detects that these two resistance just can determine the position of touch point on this sensing unit.The embodiment of the invention simple in structure, and for a sensing unit, can carry out charge or discharge from its first electrode and/or the second electrode, and when charge or discharge, detect, not only can reduce the RC constant, save time and raise the efficiency, and can guarantee that coordinate can not be offset.In addition, the property that the embodiment of the invention can also the Effective Raise circuit ratio of making an uproar reduces circuit noise, improves the induction linearity.And, in testing process because the sensing unit that is touched is charged, therefore wherein can produce little electric current, can eliminate well the Vcom level signal to the impact of the self-capacitance of sensing unit generation in the touch-screen, therefore screenmask layer and concerned process steps can be correspondingly eliminated, thereby cost can be when having strengthened antijamming capability, further reduced.
In the description of this instructions, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present invention or the example in conjunction with specific features, structure, material or the characteristics of this embodiment or example description.In this manual, the schematic statement of above-mentioned term not necessarily referred to identical embodiment or example.And the specific features of description, structure, material or characteristics can be with suitable mode combinations in any one or more embodiment or example.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, modification, replacement and modification to these embodiment that scope of the present invention is by claims and be equal to and limit.