CN102902387A - Sensing unit, touch screen detector and touch device - Google Patents
Sensing unit, touch screen detector and touch device Download PDFInfo
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- CN102902387A CN102902387A CN201110210958XA CN201110210958A CN102902387A CN 102902387 A CN102902387 A CN 102902387A CN 201110210958X A CN201110210958X A CN 201110210958XA CN 201110210958 A CN201110210958 A CN 201110210958A CN 102902387 A CN102902387 A CN 102902387A
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Abstract
The invention provides a sensing unit, a touch screen detector and a touch device. The touch device comprises a substrate, a plurality of non-crossing sensing units and a detection module. The sensing units are formed on the substrate. Each sensing unit is provided with first electrodes and second electrodes opposite to each other and comprises a plurality of first structures and a plurality of second structures, and the first structures are connected end to end through the second structures. By the use of the sensing unit, the touch screen and the touch device, signal-to-noise ratio of a circuit can be increased effectively, circuit noise can be lowered, and sensing linearity can be improved.
Description
Technical field
The present invention relates to electronic device design and manufacturing technology field, particularly a kind of sensing unit, touch screen detection device and contactor control device.
Background technology
At present the range of application of touch-screen is from the past ATM (automatic teller machine), minority's business markets such as industrial computer, expand to rapidly mobile phone, PDA (personal digital assistant), GPS (GPS), PMP (MP3, MP4 etc.), even the mass consumption electronic applications such as panel computer.Be used for touch-screen and have advantages of that touch control operation is simple, convenient, hommization, so touch-screen is expected to become the best interface of human-computer interaction and is widely applied in portable set rapidly.
Capacitance touch screen is divided into self-capacitance and mutual capacitance two classes usually.As shown in Figure 1, be the structural drawing of a kind of self-capacitance touch screen common in the prior art.This self-capacitance touch screen mainly contains double-deck diamond structure sensing unit 100 ' and 200 ', and its detection principle is that X-axis and Y-axis are scanned respectively, has exceeded preset range if detect the capacitance variations of certain point of crossing, then with this point of crossing as touch coordinate.Although the linearity of this self-capacitance touch screen is better, often there's something fishy, and point occurs, and is difficult to realize multiple point touching.In addition, owing to adopting bilayer screen, also can cause structure and cost significantly to increase, and diamond structure the coordinate drift can occur in the situation that capacitance change is very little, affected greatly by external interference.
As shown in Figure 2, be the structural drawing of another kind of self-capacitance touch screen common in the prior art.This self-capacitance touch screen adopts triangular pattern screen structure.This self-capacitance touch screen comprises substrate 300 ', is arranged on a plurality of electrodes 500 ' that a plurality of triangle sensing units 400 ' on the substrate 300 ' link to each other with each triangle sensing unit 400 '.It detects principle is single-ended detection, and namely single self-capacitance module detects.Although this self-capacitance touch screen structure is more simple, the capacitive sensing for screen is not optimized, and capacitance change is little, thereby causes signal to noise ratio (S/N ratio) inadequate.In addition, the unreasonable coordinate Calculation that also caused of this self-capacitance touch screen figure is offset, and the linearity is good not.
In this appearance formula touch-screen, the line of induction is to be made into subtriangular ring-type by conductive material.Being placed in the geometry of the line of induction reversed the line of induction of two vicinities staggered relatively end to end.The width of the line of induction and the space between the line of induction have determined needed number of electrodes in the given area.And the quantity of the line of induction will affect relatively between the complexity of putting position and the available resolution of fixed point.Simultaneously, fixed point resolution also can be subject to the impact of line of induction edge shape.As shown in Figure 2, because the face that people's finger 600 ' touches on the screen is an ellipse, and there is the impact of a slope in the design of figure, analyze from the physics angle, oval mobile at screen, triangle sensing unit 400 capped part areas can not become a stable linear change, and are same, and the inductance capacitance of capped part changes can not become a stable linearity yet.In addition, this capacitive sensing unit output capacitance variable quantity is very little, reaches the flying method level, and the existence of its cable stray capacitance is had higher requirement to metering circuit.And stray capacitance can change with many factors such as temperature, position, inner electric field and outer electric field distributions, disturbs even floods the measured capacitance signal.In addition, for individual layer electric capacity, because the meeting that affects of Vcom voltage forms serious interference to inductance capacitance, wherein, Vcom voltage is not stop the voltage that overturns in order to prevent the lcd screen liquid crystal aging.
Summary of the invention
Purpose of the present invention is intended to solve at least one of above-mentioned technological deficiency, particularly solves or avoid to occur the above-mentioned shortcoming in the existing self-capacitance touch screen.
Embodiment of the invention first aspect has proposed a kind of contactor control device, comprising: substrate; A plurality of disjoint sensing units, described a plurality of sensing unit is formed on the described substrate, and each of described a plurality of sensing units includes the first electrode, the second electrode, a plurality of the first structure, with a plurality of the second structures, wherein, by described a plurality of the second structures described a plurality of the first structures are joined end to end, and described the first electrode links to each other with the first structure of described sensing unit one end, described the second electrode links to each other with the first structure of the described sensing unit other end; And detection module, described detection module respectively with described a plurality of sensing units in each the first electrode link to each other with the second electrode, described detection module applies level signal to the first electrode and/or second electrode of described a plurality of sensing units, the self-capacitance charging that described level signal produces to described sensing unit when sensing unit is touched, and described detection module one or part when being touched in detecting described a plurality of sensing unit, calculate the first electrode described in the corresponding sensing unit to the first resistance of described self-capacitance and described the second electrode proportionate relationship between the second resistance of described self-capacitance extremely, and determine touch location on first direction according to the proportionate relationship between described the first resistance and described the second resistance, and according to the touch location of location positioning on second direction of the described sensing unit that is touched.
Embodiment of the invention second aspect has also proposed a kind of sensing unit, comprising: a plurality of the first structures; A plurality of the second structures join end to end a plurality of the first structures by described a plurality of the second structures; The first electrode, described the first electrode links to each other with the first structure of described sensing unit one end; With the second electrode, described the second electrode links to each other with the first structure of the described sensing unit other end, wherein, each first electrode and the second electrode all with a pin of touch screen controller.
The embodiment of the invention third aspect has also proposed a kind of touch screen detection device, comprising: substrate; With a plurality of disjoint sensing units, described a plurality of sensing unit is formed on the described substrate, and each of described a plurality of sensing units includes the first electrode, the second electrode, a plurality of the first structure, with a plurality of the second structures, wherein, by described a plurality of the second structures described a plurality of the first structures are joined end to end, and described the first electrode links to each other with the first structure of described sensing unit one end, described the second electrode links to each other with the first structure of the described sensing unit other end, and each first electrode all links to each other with a pin of touch screen controller with the second electrode.
Embodiment of the invention fourth aspect has also proposed a kind of contactor control device, comprising: touch screen detection device, described touch screen detection device are aforesaid touch screen detection device; Touch screen controller, a part of pin in the described touch screen controller links to each other with the first electrode of described a plurality of sensing units, another part pin in the described touch screen controller links to each other with the second electrode of described a plurality of sensing units, and described touch screen controller applies level signal to the first electrode and/or second electrode of described a plurality of sensing units, the self-capacitance charging that described level signal produces to described sensing unit when sensing unit is touched, and described touch screen controller one or part when being touched in detecting described a plurality of sensing unit are calculated the first electrode described in the corresponding sensing unit to the first resistance of described self-capacitance and described the second electrode proportionate relationship between the second resistance of described self-capacitance extremely; Host computer, described host computer receives the first resistance of described touch screen controller transmission and the proportionate relationship between the second resistance, and determine touch location on first direction according to the proportionate relationship between described the first resistance and described the second resistance, and according to the touch location of location positioning on second direction of the described sensing unit that is touched.
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.The embodiment of the invention has proposed a kind of self-capacitance detection mode of novelty, when sensing unit is touched, the touch point is divided into two resistance with this sensing unit, 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 at its first electrode and the second electrode, can reduce the RC constant, save time and raise the efficiency, and 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.
In addition, the contactor control device of the embodiment of the invention is not affected by mutual capacitance, to fully not reaction of water.Because having a coupling capacitance between display screen and the sensing unit exists, because Vcom is in ceaselessly upset, being equivalent to a end in this coupling capacitance has added one and has not stopped the voltage that overturns, violent shake will occur in the other end voltage of coupling capacitance, thereby can badly influence sensing unit capacitance variations over the ground, when sensing unit is touched because the voltage that applies can make generation current in the sensing unit, added a constant voltage with regard to equaling at the other end of coupling capacitance, even Vcom is not stopping upset, faint variation also only can occur in the other end voltage of coupling capacitance, therefore screenmask layer and concerned process steps can be correspondingly eliminated, thereby cost can be when having strengthened antijamming capability, further reduced.And the sensing unit structure by the embodiment of the invention is noise decrease effectively, improves the linearity of induction.
The aspect that the present invention adds and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present invention.
Description of drawings
Above-mentioned and/or the additional aspect of the present invention and advantage are from obviously and easily understanding becoming the description of embodiment below in conjunction with accompanying drawing, wherein:
Fig. 1 is the structural drawing of a kind of self-capacitance touch screen common in the prior art;
Fig. 2 is the structural drawing of another kind of self-capacitance touch screen common in the prior art;
Fig. 3 is the detection principle schematic of embodiment of the invention contactor control device;
Fig. 4 is the touch detecting method process flow diagram of the embodiment of the invention;
Fig. 5 is the contactor control device schematic diagram of one embodiment of the invention;
Fig. 6 is the contactor control device schematic diagram of another embodiment of the present invention.
Embodiment
The below describes embodiments of the invention in detail, and the example of described embodiment is shown in the drawings, and wherein same or similar label represents same 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; Anyway, 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, can 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.In addition, in an embodiment of the present invention, detection can be carried out (obtaining the first charging detected value and the second charging detected value) when charging, also can carry out (obtaining the first discharge examination value and the second discharge examination value) when discharge.In addition, the detection of carrying out when charging and discharging can be adopted various ways.But need to prove, have at least a step that the first electrode and the second electrode are carried out in charging, discharge or the detection, can obtain like this to react two detected values of difference between the first resistance and the second resistance, i.e. the first detected value and the second detected value.That is to say electric current need to be arranged through the first resistance and the second resistance when charging, discharge or detection, the first detected value that detects like this and the second detected value can react the difference between the first resistance and the second resistance.In an embodiment of the present invention, usually need to fill twice electricity (comprising simultaneously the situation to the first electrode and the second electrode charge), and twice detection.In certain embodiments, also may carry out twice discharge.All be to carry out twice charging and twice detection in following embodiment, in following embodiment, repeat no more.Need to prove at this, carry out a kind of scheme that twice charging and twice detection only are the embodiment of the invention, algorithm is relatively simple.Yet those skilled in the art also can increase according to above-mentioned thought the number of times of charging and detection, for example can carry out three chargings and detection, calculate the first resistance according to primary charging detected value and secondary charging detected value afterwards, calculate the second resistance according to primary charging detected value and charging detected value for the third time again.
Particularly, the present invention includes but be not limited to following several metering system and detect:
1, elder generation applies level signal with self-capacitance is charged (will produce self-capacitance if this sensing unit is touched) to the first electrode and second electrode of sensing unit; Then charge detection to obtain the first charging detected value and the second charging detected value from the first electrode and/or the second electrode.In this embodiment, because charging is carried out from the first electrode and the second electrode, therefore for detecting, both can detect from the first electrode, also can detect from the second electrode, perhaps also can detect respectively from the first electrode and the second electrode.Also need to prove, in this embodiment, charging to the first electrode and the second electrode can be carried out simultaneously, also can carry out respectively, for example apply simultaneously identical level signal so that self-capacitance is charged at the first electrode and the second electrode, in other embodiments, the level signal that applies of the first electrode and the second electrode also can be different; Perhaps, also can apply a level signal at the first electrode first, apply same level signal or another level signal at the second electrode more afterwards.Similarly, both can carry out simultaneously when detecting, also can carry out respectively.In following examples, charging, discharge or detection all can be carried out simultaneously, perhaps carry out respectively, do not repeat them here.
2, the first electrode or the second electrode to described sensing unit applies respectively level signal for twice so that described self-capacitance is carried out twice charging; Then after each charging, charge detection to obtain described the first charging detected value and the second charging detected value from described the first electrode and/or the second electrode.The first electrode or the second electrode to sensing unit applies level signal so that self-capacitance is charged first; Then charge detection to obtain the first charging detected value and the second charging detected value from the first electrode and the second electrode respectively.In this embodiment, because charging is carried out from the first electrode or the second electrode, therefore need to detect respectively from the first electrode and the second electrode when detecting, wherein, detection can be carried out simultaneously, also can carry out respectively.In addition, in an embodiment of the present invention, can also carry out twice charging at the first electrode, and carry out twice detection from the first electrode, perhaps, carry out twice charging from the second electrode, carry out twice detection at the second electrode.So long as, twice when charging, respectively with another electrode grounding or connect high resistant to change the state of another electrode.For example apply respectively level signal for twice self-capacitance being carried out twice when charging when the first electrode to sensing unit, wherein, in twice charging once with described the second electrode grounding, another time connects described the second electrode and is high resistant; When the second electrode to sensing unit applies respectively level signal for twice self-capacitance being carried out twice when charging, in twice charging once with described the first electrode grounding, another time connects described the first electrode and is high resistant.Even carried out twice charging at the first electrode like this, because the change of the second electrode state, also can carry out twice detection at the first electrode, to obtain to react the first detected value and second detected value of the first resistance R 1 and the second resistance R 2 ratios relation.
3, the first electrode and the second electrode to sensing unit applies level signal so that self-capacitance is charged; Then control the first electrode and/or the second electrode grounding so that self-capacitance is discharged; Carry out discharge examination to obtain described the first discharge examination value and the second discharge examination value from the first electrode and/or the second electrode afterwards.In this embodiment, because charging is carried out from the first electrode and the second electrode to self-capacitance, therefore discharge or detection just can be carried out from the first electrode and/or the second electrode.Particularly, for example can apply level signal so that self-capacitance is charged to the first electrode and the second electrode simultaneously, perhaps also can not apply simultaneously.Twice discharge can be all with the first electrode grounding, perhaps all with the second electrode grounding when discharge.
4, the first electrode or the second electrode to sensing unit applies level signal so that self-capacitance is charged; Then control respectively the first electrode and the second electrode grounding so that self-capacitance is discharged; Carry out discharge examination to obtain the first discharge examination value and the second discharge examination value from the first electrode and/or the second electrode respectively afterwards.In this embodiment, because discharge is carried out from the first electrode and the second electrode to self-capacitance, therefore charging or detection just can be carried out from the first electrode and/or the second electrode.In this embodiment, twice charging also can all be used the first electrode, and with the second electrode ground connection or connect and be high resistant respectively.Similarly, twice charging also can all be used the second electrode, and with the first electrode ground connection or connect and be high resistant respectively.
5, the first electrode or the second electrode to sensing unit applies level signal so that self-capacitance is charged; Then control respectively the first electrode or the second electrode grounding with to the self-capacitance discharge, carry out discharge examination to obtain the first discharge examination value and the second discharge examination value from the first electrode and the second electrode respectively afterwards.In this embodiment, because detection is carried out from the first electrode and the second electrode to self-capacitance, so charge or discharge just can be carried out from the first electrode and/or the second electrode.In this embodiment, twice charging also can all be used the first electrode, and with the second electrode ground connection or connect and be high resistant respectively.Similarly, twice charging also can all be used the second electrode, and with the first electrode ground connection or connect and be high resistant respectively.
Perhaps, on the basis of above-described embodiment, can also when charging, carry out one-time detection to obtain the first charging detected value, carry out second time in when discharge and detect to obtain the second discharge examination value, obtain proportionate relationship between the first resistance and the second resistance according to the first charge detected value and the second discharge examination value again.
Can find out for above-mentioned charging of the present invention and detection mode a variety of variations are arranged from foregoing description, but core of the present invention is exactly according to the relation between the first resistance and the second resistance, for example proportionate relationship or other concern to determine the position of touch point.Further, the relation between this first resistance and the second resistance need to detect by charging and/or the discharge of self-capacitance.If sensing unit is not touched, then just can not produce self-capacitance, therefore there is not follow-up charge/discharge/detection etc. yet, no longer detect for this embodiment of the invention, do not repeat them here.
Also need to prove in addition, above-mentioned detection mode only is optimal way of the present invention, and those skilled in the art also can expand or revise according to above-mentioned thought, and these all should be included within protection scope of the present invention.
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 applies level signal to the two ends of sensing unit, and namely the first electrode and/or the second electrode to sensing unit applies level signal.In this embodiment, can apply identical level signal with the second electrode to the first electrode, also can apply different level signals.In other embodiments, also can only charge twice from the first electrode or the second electrode, perhaps for the first time from the first electrode charge for the second time from the second electrode charge, perhaps for the first time from the second electrode charge for the second time from the first electrode charge.
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), just can charge to self-capacitance by the level signal that applies.In an embodiment of the present invention, by the charging to self-capacitance, can improve the accuracy of detection of self-capacitance.
Need to prove, if apply simultaneously level signal to the two ends of sensing unit, then need corresponding two self-capacitance detection sub-module to detect from the two ends of sensing unit simultaneously.And if respectively to the two ends time, then only need a self-capacitance detection sub-module to get final product.
In one embodiment of the invention, the first detected value and the second detected value can for from the first electrode and/or the second electrode detection to capacitance charge variation delta Q1 and Δ Q2.
By Δ Q1 and Δ Q2, namely detect and derive from capacitance change, just can calculate the ratio of R1 and R2, owing to the regular linear relation of figure, then can calculate the position of the horizontal ordinate at place, touch point, and the position at self-capacitance C1 place.
Step S402 detects sensing unit from the two ends of sensing unit, to obtain the first detected value and the second detected value.In this embodiment, detection can be carried out when charging, also can carry out when discharge.In above-mentioned example, the first detected value and the second detected value are respectively Δ Q1 and Δ Q2.Below be described as the charge variation amount as example take the first detected value and the second detected value, but can reaction resistance R1 and other detected values of R2 relation, also all can adopt such as level signal, electric current etc.In an embodiment of the present invention, both can detect simultaneously, also can detect respectively.
In one embodiment of the invention, if detect simultaneously, then need two self-capacitance detection modules simultaneously the first electrode and the second electrode to be detected.
In another embodiment of the present invention, also can adopt a self-capacitance detection module to detect, in step S401, after being full of by the first electrode pair self-capacitance C1, namely this self-capacitance detection module detects by the first electrode pair self-capacitance C1.Then again by the second electrode pair self-capacitance C2 charging, then this self-capacitance detection module detects by the second electrode pair self-capacitance C1 again.
Because the phase place that adopts when the self-capacitance detection module scans this sensing unit is all consistent with level signal, the electric charge when therefore charging for same self-capacitance C1 just equals the inverse ratio of their resistance.Supposing, is respectively Δ Q1 and Δ Q2 from the first electrode of sensing unit and the charge variation amount of the second electrode pair sensing unit detection acquisition.In an embodiment of the present invention, the self-capacitance detection module can be at present known self-capacitance detection module.In one embodiment of the invention, if adopt two self-capacitance detection modules, but then owing to two a plurality of devices of self-capacitance detection module technique, therefore can not increase the overall power of chip.
Step S403 judges according to the first detected value and the second detected value whether this sensing unit is touched.Particularly, in one embodiment of the invention, can whether determine whether to be touched greater than threshold value by judging charge variation amount Δ Q1 and Δ Q2.Certainly, in other embodiments of the invention, also other judgment modes can be set, whether for example judge charge variation amount Δ Q1 and Δ Q2 less than threshold value, if less than, judge that then sensing unit is touched.Similarly, this threshold value also needs according to the size of touch-screen and type, and the size of sensing unit is determined.
Step S404 is touched if judge this sensing unit, then further calculates the first electrode described in the corresponding sensing unit this moment to the first resistance of described self-capacitance and described the second electrode proportionate relationship between the second resistance of described self-capacitance extremely.In an embodiment of the present invention, proportionate relationship between the first resistance and described the second resistance is according to the self-capacitance charge/discharge time, from 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 same, the coordinate on the sensing unit at C1 place is Δ Q2/ (Δ Q1+ Δ Q2).
Step S405 is according to the touch location of location positioning on second direction of sensing unit.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:
The embodiment of the invention has proposed a kind of contactor control device according to above-mentioned thought.This contactor control device comprises substrate, a plurality of disjoint sensing unit.Wherein, a plurality of sensing units are formed on the substrate, and each of a plurality of sensing units all has the first electrode and the second electrode that is oppositely arranged.As shown in Figure 5, be the contactor control device schematic diagram of one embodiment of the invention.This contactor control device comprises substrate 100, a plurality of disjoint sensing unit 200 and detection module 300.Wherein, as shown in the figure, this sensing unit 200 comprises the first electrode 210 and the second electrode 220 and a plurality of the first structure 230, and a plurality of the second structure 240.Wherein, a plurality of the second structures 240 can be parallel to each other, also can be not parallel.And the angle between the second structure 240 and the first structure 230 is preferably 90 degree, certainly also can select other angles.As shown in Figure 5, this sensing unit 200 joins end to end a plurality of the first structures 230 by a plurality of the second structures 240, and the first electrode 210 of sensing unit 200 links to each other with first structure 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.Although in the drawings 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.Because the graphic structure of the sensing unit of the embodiment of the invention is the snakelike of rule, is specially reality and is formed by connecting for several rectangles.Therefore, area on the sensing unit is relatively more regular other figures and area is larger when finger covers.For example, for triangle, and have the problem of slope, and its area coverage has uncertain factor; For rhombus, the area that finger covers rhombus needs half to bring the calculating directions X, and half calculates Y-direction in addition, so the area of rhombus has only been used half concerning each direction.And in embodiments of the present invention, whole finger area coverage is all brought and is calculated X coordinate and Y coordinate, so variable quantity is larger, is easy to detect.In like manner, the sensing unit capacitance variations that finger covers is also more accurate, thereby has improved the linearity.And traditional rhombus or triangle all are single-ended lead-in wires, and the structure of this single-ended lead-in wire self is exactly an antenna structure, so more easily attract and emitting electromagnetic wave causes the interference of self and to the interference of other modules.And the structure of the double end of embodiment of the invention sensing unit self forms the antenna of a closed loop rather than open loop, thus be not easy to attract noise also to be not easy shot noise, thus the impact of noise reduction has improved sensitivity.
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 sensing unit 200 is and is horizontally disposed with or vertically arranges.Although in Fig. 5 of this embodiment, the sensing unit along continuous straight runs is placed, in other embodiments, sensing unit also can vertically arrange.
As shown in Figure 6, be the contactor control device schematic diagram of another embodiment of the present invention.This contactor control device comprises touch screen detection device, touch screen controller 400 and the host computer 500 that links to each other with touch screen controller 400 that is made of substrate 100 and a plurality of sensing units that are parallel to each other 200.Wherein, a part of pin in the touch screen controller 400 links to each other with the first electrode 210 of a plurality of sensing units 200, another part pin in the touch screen controller 400 links to each other with the second electrode 220 of a plurality of sensing units 200, touch screen controller 400 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, and touch screen controller 400 one or part when being touched in detecting a plurality of sensing units 200, calculate the first electrode in the corresponding sensing unit 200 to the first resistance of self-capacitance and the second electrode to the proportionate relationship between the second resistance of self-capacitance.Similarly, this charging, discharge and detection can be carried out also can carrying out respectively simultaneously, do not repeat them here.In addition, 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, as long as can react the difference between the first resistance and the second resistance.In one embodiment of the invention, comprise among the touch screen controller 400 that two self-capacitance detection modules are to detect from the first electrode 210 and 220 pairs of sensing units 200 of the second electrode simultaneously.Because these two self-capacitance detection modules can share some devices, therefore also can not increase the overall power of chip.In another embodiment of the present invention, also can only adopt a self-capacitance detection module to detect from the first electrode 210 and 220 pairs of sensing units 200 of the second electrode successively.Host computer 500 receives the first resistance of touch screen controller 400 transmissions and the proportionate relationship between the second resistance, and determine touch location on first direction according to the proportionate relationship between the first resistance and the second resistance, and according to the touch location of location positioning on second direction of the sensing unit that is touched.。In an embodiment of the present invention, can adopt the touch location of centroid algorithm calculating on second direction, thereby further improve precision.Like this, host computer 500 just can be determined 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.
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.
The embodiment of the invention has proposed a kind of self-capacitance detection mode of novelty, when sensing unit is touched, the touch point is divided into two resistance with this sensing unit, 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 at its first electrode and the second electrode, can reduce the RC constant, save time and raise the efficiency, and 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.In addition, the contactor control device of the embodiment of the invention is not affected by mutual capacitance, to fully not reaction of water.Because having a coupling capacitance between display screen and the sensing unit exists, because Vcom is in ceaselessly upset, being equivalent to a end in this coupling capacitance has added one and has not stopped the voltage that overturns, violent shake will occur in the other end voltage of coupling capacitance, thereby can badly influence sensing unit capacitance variations over the ground, when sensing unit is touched because the voltage that applies can make generation current in the sensing unit, added a constant voltage with regard to equaling at the other end of coupling capacitance, even Vcom is not stopping upset, faint variation also only can occur in the other end voltage of coupling capacitance, therefore screenmask layer and concerned process steps can be correspondingly eliminated, thereby cost can be when having strengthened antijamming capability, further reduced.And the sensing unit structure by the embodiment of the invention is noise decrease effectively, improves the linearity of induction.
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, scope of the present invention is by claims and be equal to and limit.
Claims (29)
1. a contactor control device is characterized in that, comprising: substrate;
A plurality of disjoint sensing units, described a plurality of sensing unit is formed on the described substrate, and each of described a plurality of sensing units includes the first electrode, the second electrode, a plurality of the first structure, with a plurality of the second structures, wherein, by described a plurality of the second structures described a plurality of the first structures are joined end to end, and described the first electrode links to each other with the first structure of described sensing unit one end, described the second electrode links to each other with the first structure of the described sensing unit other end; With
Detection module, described detection module respectively with described a plurality of sensing units in each the first electrode link to each other with the second electrode, described detection module applies level signal to the first electrode and/or second electrode of described a plurality of sensing units, the self-capacitance charging that described level signal produces to described sensing unit when sensing unit is touched, and described detection module one or part when being touched in detecting described a plurality of sensing unit, calculate the first electrode described in the corresponding sensing unit to the first resistance of described self-capacitance and described the second electrode proportionate relationship between the second resistance of described self-capacitance extremely, and determine touch location on first direction according to the proportionate relationship between described the first resistance and described the second resistance, and according to the touch location of location positioning on second direction of the described sensing unit that is touched.
2. contactor control device as claimed in claim 1, it is characterized in that, proportionate relationship between described the first resistance and described 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.
3. contactor control device as claimed in claim 2 is characterized in that, described the first detected value and described the second detected value are one or more in current detection value, self-capacitance detected value, voltage detecting value and the charge variation amount.
4. contactor control device as claimed in claim 1 is characterized in that, described detection module is determined the position of described touch point on touch-screen according to the touch location on the described first direction and the touch location on the second direction.
5. such as claim 1 or 4 described contactor control devices, it is characterized in that, described first direction is the length direction of described sensing unit, and described second direction is the direction perpendicular to described sensing unit, and described sensing unit is horizontally disposed with or vertically arranges.
6. contactor control device as claimed in claim 1 is characterized in that, described the first structure and described the second structure are rectangle.
7. contactor control device as claimed in claim 2 is characterized in that, described the first detected value comprises the first charging detected value or the first discharge examination value, and described the second detected value comprises the second charging detected value or the second discharge examination value.
8. contactor control device as claimed in claim 7, it is characterized in that, described detection module applies level signal so that described self-capacitance is charged to the first electrode and second electrode of described sensing unit, and described detection module charges detection to obtain described the first charging detected value and the second charging detected value from described the first electrode and/or the second electrode.
9. contactor control device as claimed in claim 7, it is characterized in that, described detection module applies respectively level signal for twice so that described self-capacitance is carried out twice charging to the first electrode or second electrode of described sensing unit, and described detection module charges detection to obtain described the first charging detected value and the second charging detected value from described the first electrode and/or the second electrode after each charging.
10. contactor control device as claimed in claim 9, it is characterized in that, when described detection module applies respectively level signal for twice when described self-capacitance being carried out twice charging to the first electrode of described sensing unit, in described twice charging once with described the second electrode grounding, another time connects described the second electrode and is high resistant;
When described detection module applies respectively level signal for twice when described self-capacitance being carried out twice charging to the second electrode of described sensing unit, in described twice charging once with described the first electrode grounding, another time connects described the first electrode and is high resistant.
11. contactor control device as claimed in claim 7, it is characterized in that, described detection module applies level signal so that described self-capacitance is charged to the first electrode and second electrode of described sensing unit, described detection module is controlled described the first electrode and/or described the second electrode grounding with to described self-capacitance discharge, and described detection module carries out discharge examination to obtain described the first discharge examination value and the second discharge examination value from described the first electrode and/or the second electrode.
12. contactor control device as claimed in claim 7, it is characterized in that, described detection module applies level signal so that described self-capacitance is charged to the first electrode or second electrode of described sensing unit, described detection module is controlled respectively described the first electrode and described the second electrode grounding with to described self-capacitance discharge, and described detection module carries out discharge examination to obtain described the first discharge examination value and the second discharge examination value from described the first electrode and/or the second electrode respectively.
13. contactor control device as claimed in claim 7, it is characterized in that, described detection module applies level signal so that described self-capacitance is charged to the first electrode or second electrode of described sensing unit, described detection module is controlled respectively described the first electrode or described the second electrode grounding with to described self-capacitance discharge, and described detection module carries out discharge examination to obtain described the first discharge examination value and the second discharge examination value from described the first electrode and the second electrode respectively.
14. contactor control device as claimed in claim 7 is characterized in that, described detection module comprises one or two self-capacitance detection sub-module.
15. a sensing unit is characterized in that, comprising:
A plurality of the first structures;
A plurality of the second structures join end to end a plurality of the first structures by described a plurality of the second structures;
The first electrode, described the first electrode links to each other with the first structure of described sensing unit one end; With
The second electrode, described the second electrode links to each other with the first structure of the described sensing unit other end,
Wherein, each first electrode all links to each other with a pin of touch screen controller with the second electrode.
16. a touch screen detection device is characterized in that, comprising:
Substrate; With
A plurality of disjoint sensing units, described a plurality of sensing unit is formed on the described substrate, and each of described a plurality of sensing units includes the first electrode, the second electrode, a plurality of the first structure, with a plurality of the second structures, wherein, by described a plurality of the second structures described a plurality of the first structures are joined end to end, and described the first electrode links to each other with the first structure of described sensing unit one end, described the second electrode links to each other with the first structure of the described sensing unit other end, and each first electrode all links to each other with a pin of touch screen controller with the second electrode.
17. a contactor control device is characterized in that, comprising:
Touch screen detection device, described touch screen detection device are touch screen detection device as claimed in claim 16;
Touch screen controller, a part of pin in the described touch screen controller links to each other with the first electrode of described a plurality of sensing units, another part pin in the described touch screen controller links to each other with the second electrode of described a plurality of sensing units, and described touch screen controller applies level signal to the first electrode and/or second electrode of described a plurality of sensing units, the self-capacitance charging that described level signal produces to described sensing unit when sensing unit is touched, and described touch screen controller one or part when being touched in detecting described a plurality of sensing unit are calculated the first electrode described in the corresponding sensing unit to the first resistance of described self-capacitance and described the second electrode proportionate relationship between the second resistance of described self-capacitance extremely;
Host computer, described host computer receives the first resistance of described touch screen controller transmission and the proportionate relationship between the second resistance, and determine touch location on first direction according to the proportionate relationship between described the first resistance and described the second resistance, and according to the touch location of location positioning on second direction of the described sensing unit that is touched.
18. contactor control device as claimed in claim 17, it is characterized in that, proportionate relationship between described the first resistance and described 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.
19. contactor control device as claimed in claim 18 is characterized in that, described the first detected value and described the second detected value are one or more in current detection value, self-capacitance detected value, voltage detecting value and the charge variation amount.
20. contactor control device as claimed in claim 17 is characterized in that, described host computer is determined the position of described touch point on touch-screen according to the touch location on the described first direction and the touch location on the second direction.
21. such as claim 17 or 20 described contactor control devices, it is characterized in that, described first direction is the length direction of described sensing unit, described second direction is the direction perpendicular to described sensing unit, and described sensing unit is horizontally disposed with or vertically arranges.
22. contactor control device as claimed in claim 17 is characterized in that, described the first detected value comprises the first charging detected value or the first discharge examination value, and described the second detected value comprises the second charging detected value or the second discharge examination value.
23. contactor control device as claimed in claim 22, it is characterized in that, described touch screen controller applies level signal so that described self-capacitance is charged to the first electrode and second electrode of described sensing unit, and described touch screen controller charges detection to obtain described the first charging detected value and the second charging detected value from described the first electrode and/or the second electrode.
24. contactor control device as claimed in claim 22, it is characterized in that, described touch screen controller applies respectively level signal for twice so that described self-capacitance is carried out twice charging to the first electrode or second electrode of described sensing unit, and described touch screen controller charges detection to obtain described the first charging detected value and the second charging detected value from described the first electrode and/or the second electrode after each charging.
25. contactor control device as claimed in claim 24, it is characterized in that, when described touch screen controller applies respectively level signal for twice when described self-capacitance being carried out twice charging to the first electrode of described sensing unit, in described twice charging once with described the second electrode grounding, another time connects described the second electrode and is high resistant;
When described touch screen controller applies respectively level signal for twice when described self-capacitance being carried out twice charging to the second electrode of described sensing unit, in described twice charging once with described the first electrode grounding, another time connects described the first electrode and is high resistant.
26. contactor control device as claimed in claim 22, it is characterized in that, described touch screen controller applies level signal so that described self-capacitance is charged to the first electrode and second electrode of described sensing unit, described touch screen controller is controlled described the first electrode and/or described the second electrode grounding with to described self-capacitance discharge, and described touch screen controller carries out discharge examination to obtain described the first discharge examination value and the second discharge examination value from described the first electrode and/or the second electrode.
27. contactor control device as claimed in claim 22, it is characterized in that, described touch screen controller applies level signal so that described self-capacitance is charged to the first electrode or second electrode of described sensing unit, described touch screen controller is controlled respectively described the first electrode and described the second electrode grounding with to described self-capacitance discharge, and described touch screen controller carries out discharge examination to obtain described the first discharge examination value and the second discharge examination value from described the first electrode and/or the second electrode respectively.
28. contactor control device as claimed in claim 22, it is characterized in that, described touch screen controller applies level signal so that described self-capacitance is charged to the first electrode or second electrode of described sensing unit, described touch screen controller is controlled respectively described the first electrode or described the second electrode grounding with to described self-capacitance discharge, and described detection module carries out discharge examination to obtain described the first discharge examination value and the second discharge examination value from described the first electrode and the second electrode respectively.
29. contactor control device as claimed in claim 22 is characterized in that, described touch screen controller comprises one or two self-capacitance detection sub-module.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110210958XA CN102902387A (en) | 2011-07-26 | 2011-07-26 | Sensing unit, touch screen detector and touch device |
| TW101126425A TWI475455B (en) | 2011-07-26 | 2012-07-23 | Induction unit, touch screen detecting device, and touch sensitive device |
| TW101214181U TWM447538U (en) | 2011-07-26 | 2012-07-23 | Induction unit, touch screen detecting device, and touch sensitive device |
| US14/131,810 US9411476B2 (en) | 2011-07-26 | 2012-07-26 | Induction unit, touch detecting assembly and touch sensitive device |
| PCT/CN2012/079219 WO2013013633A1 (en) | 2011-07-26 | 2012-07-26 | Induction unit, touch detecting assembly and touch sensitive device |
| US14/131,729 US9459739B2 (en) | 2011-07-26 | 2012-07-26 | Induction unit, touch detecting assembly and touch sensitive device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110210958XA CN102902387A (en) | 2011-07-26 | 2011-07-26 | Sensing unit, touch screen detector and touch device |
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| CN102902387A true CN102902387A (en) | 2013-01-30 |
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| CN201110210958XA Pending CN102902387A (en) | 2011-07-26 | 2011-07-26 | Sensing unit, touch screen detector and touch device |
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