CN202548806U - Touch control apparatus and portable electronic equipment - Google Patents
Touch control apparatus and portable electronic equipment Download PDFInfo
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- CN202548806U CN202548806U CN2011205736916U CN201120573691U CN202548806U CN 202548806 U CN202548806 U CN 202548806U CN 2011205736916 U CN2011205736916 U CN 2011205736916U CN 201120573691 U CN201120573691 U CN 201120573691U CN 202548806 U CN202548806 U CN 202548806U
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing electrodes
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0448—Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality
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Abstract
The utility model provides a touch control apparatus. The touch control apparatus comprises a substrate; a plurality of non-intersect induction units, the induction units are formed on the substrate, and each of the induction units is provided with a first electrode and a second electrode; and a touch screen control chip. The touch control apparatus and the portable electronic equipment has simple structure; and the induction unit is detected when being charged or discharged, not only RC constant is reduced, time is saved, efficiency is improved, but also coordinates are guaranteed not to be offseted.
Description
Technical field
The utility model relates to electronic device design and manufacturing technology field, particularly a kind of contactor control device and a kind of portable electric appts.
Background technology
At present the range of application of touch-screen is from the past ATM (automatic teller machine), and minority's business markets such as industrial computer expand to mobile phone rapidly; PDA (personal digital assistant), GPS (GPS), PMP (MP3; Even mass consumption electronic applications such as panel computer MP4 etc.).Be used for touch-screen and have that touch control operation is simple, convenient, the advantage of hommization, so touch-screen is expected to become the best interface of human-computer interaction and in portable set, has obtained widespread use rapidly.
Capacitance touch screen is divided into two types of self-capacitance and mutual capacitance 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 '; It detects principle is that X axle and Y axle are scanned respectively; Exceeded preset range if detect the capacitance variations of certain point of crossing, then with the point of crossing of this row and column as touch coordinate.Though 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,, also can cause structure and cost significantly to increase, and diamond structure the coordinate drift can occur under the very little situation of capacitance change, influenced greatly by external interference owing to adopt bilayer screen.
Shown in Fig. 2 a, 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 '.Shown in Fig. 2 b, be the detection principle of triangle self-capacitance touch-screen.As shown in the figure, ellipse representation finger, S1, S2 represent to point the contact area with two triangle sensing units.The false coordinate initial point is in the lower left corner, horizontal ordinate X=S2/ (S1+S2) * P then, and wherein, P is a resolution.When finger moved right, because S2 is not linear the increase, there was a deviation in the X coordinate.Can find out that from above-mentioned principle present triangle sensing unit is a single-ended detection, promptly only detect, calculate the coordinate of both direction then through algorithm from a direction.Though this self-capacitance touch screen structure is more simple, the capacitive sensing to screen is not optimized, and capacitance change is little, thereby causes signal to noise ratio (S/N ratio) not enough.In addition, because this sensing unit is a triangle, area is not linear the increase when finger laterally moves, so the linearity is relatively poor, has caused coordinate Calculation to squint, and the linearity is good inadequately.
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 factor affecting 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 influences of Vcom level signal forms serious disturbance to inductance capacitance, wherein, the Vcom level signal is not stop the level signal of overturning in order to prevent the lcd screen liquid crystal aging.
The utility model content
The purpose of the utility model 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.
The utility model embodiment first aspect has proposed a kind of contactor control device, comprising: substrate; A plurality of disjoint sensing units, said a plurality of sensing units are formed on the said substrate, and the two ends of each sensing unit have first electrode and second electrode respectively; The touch-screen control chip; Said touch-screen control chip comprises charging device, discharge device and detection means; Wherein, Said charging device is used in the charging process first time, with first electrode grounding of a sensing unit in said a plurality of sensing units and apply high level signal to second electrode and charge with the self-capacitance that when a said sensing unit is touched, a said sensing unit is produced; In second time charging process, apply high level signal so that said self-capacitance is charged with first electrode grounding of a sensing unit in said a plurality of sensing units and to second electrode; And in charging process for the third time; First electrode and second electrode to a said sensing unit apply high level signal; Perhaps; One in said first electrode and said second electrode applies high level signal also with another disconnection in said first electrode and said second electrode; So that said self-capacitance is charged for the third time; Said discharge device is used for after said charging device charges to said self-capacitance for the first time, with first electrode of a said sensing unit and at least one ground connection in second electrode; So that said self-capacitance is discharged; And detection means, be used for detecting to obtain the first change detected value between the said charging first time and the said first time of the discharge from said first electrode or second electrode of correspondence, reach from said first electrode or second electrode of correspondence and detect to obtain the said charging second time and the said second change detected value between the charging for the third time; And control and calculating device; Be used for said charging device, discharge device, detection means are controlled, and calculate first resistance and the proportionate relationship between second resistance between said self-capacitance to said second electrode between said self-capacitance to said first electrode, and confirm touch location according to the proportionate relationship between said first resistance and said second resistance according to the first change detected value and the second change detected value.
The utility model embodiment second aspect has also proposed a kind of portable electric appts, comprises aforesaid contactor control device.
Sensing unit in the Touch-screen testing equipment of the utility model embodiment 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, when touching detection, can realize the location to the touch point through sensing unit self.
What is more important; Ratio realizes confirming of touch location to the utility model between first resistance and second resistance through calculating, therefore with respect to present rhombus or triangular design, because when confirming touch location; Need not to calculate the size of self-capacitance; And the size of self-capacitance can not influence the precision of touch location, thereby has improved measuring accuracy, has improved the linearity.
The utility model embodiment applies level signal through the electrode to the sensing unit two ends; If this sensing unit is touched; Touch object (for example finger) and then can form self-capacitance with this sensing unit; Therefore the utility model can charge to this self-capacitance through the level signal that applies, and confirms the touch location on the touch-screen according to the proportionate relationship between first resistance and second resistance.And, offsetting some immeasurablel physical parameter or to reduce the measurement of physical quantity, thereby under the prerequisite that guarantees detection speed, improve accuracy of detection effectively through the detection mode that self-capacitance is carried out twice charging of the utility model embodiment.
The utility model embodiment has proposed a kind of self-capacitance detection mode of novelty; When sensing unit is touched; The touch point just can be divided into two resistance with this sensing unit, thereby is carrying out considering when self-capacitance detects that these two resistance just can confirm the position of touch point on this sensing unit.The utility model embodiment's is simple in structure, and for a sensing unit, when charge or discharge, detects, and not only can reduce the RC constant, saves time and raises the efficiency, and can guarantee that coordinate can not squint.In addition, the property that the utility model embodiment can also effectively the improve circuit ratio of making an uproar reduces circuit noise, improves the induction linearity.In addition; In testing process because the sensing unit that is touched is charged; Therefore wherein can produce little electric current; Can eliminate of the influence of Vcom level signal well, therefore can correspondingly eliminate screenmask layer and concerned process steps, thereby can when having strengthened antijamming capability, further reduce cost the self-capacitance of sensing unit generation in the touch-screen.
Aspect that the utility model is additional and advantage part in the following description provide, and part will become obviously from the following description, or recognize through the practice of the utility model.
Description of drawings
Above-mentioned and/or additional aspect of the utility model and advantage are from obviously with 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 a is the structural drawing of another kind of self-capacitance touch-screen common in the prior art;
Fig. 2 b is the detection schematic diagram of another kind of self-capacitance touch-screen common in the prior art;
Fig. 3 is the detection principle schematic of the utility model embodiment contactor control device;
Fig. 4 is the touch detecting method process flow diagram of the utility model embodiment;
Fig. 5 is the synoptic diagram that the rectangle sensing unit of the utility model embodiment is touched;
Fig. 6 a is the sensing unit structural drawing of an embodiment of the utility model;
Fig. 6 b is the sensing unit structural drawing of an embodiment of the utility model;
Fig. 7 a is another embodiment Touch-screen testing equipment structural drawing of the utility model;
Fig. 7 b is another embodiment touch screen detection device structural drawing of the utility model;
Synoptic diagram when Fig. 8 is touched for the sensing unit of the utility model embodiment;
Fig. 9 a is another embodiment Touch-screen testing equipment structural drawing of the utility model;
Fig. 9 b is another embodiment touch screen detection device structural drawing of the utility model;
Synoptic diagram when Figure 10 is touched for the sensing unit of the utility model embodiment;
Figure 11 is the contactor control device synoptic diagram of an embodiment of the utility model;
Figure 12 is the structural drawing of the utility model embodiment touch-screen control chip.
Embodiment
Describe the embodiment of the utility model below in detail, the example of said embodiment is shown in the drawings, and wherein identical from start to finish or similar label is represented identical or similar elements or the element with identical or similar functions.Be exemplary through the embodiment that is described with reference to the drawings below, only be used to explain the utility model, and can not be interpreted as restriction the utility model.
The utility model embodiment has proposed a kind of self-capacitance detection mode of novelty; When sensing unit is touched; The touch point can be divided into two resistance with this sensing unit, is carrying out considering when self-capacitance detects that these two resistance just can confirm the position of touch point on this sensing unit.As shown in Figure 3, be the detection principle schematic of the utility model embodiment 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 touch point position.For example, as scheme saidly, when touch point and first electrode were nearer, then resistance R 1 was just less, and resistance R 2 is just bigger; Otherwise when touch point and second electrode were nearer, then resistance R 1 was just bigger, and resistance R 2 is just less.Therefore, the utility model is through just confirming the position of touch point on this sensing unit to the detection of resistance R 1 and R2.In the embodiment of the utility model; Detect resistance R 1 and R2 in several ways; For example can be through in the current detecting changing value, self-capacitance change detected value, level signal change detected value and the change in electrical charge amount that detect first electrode and second electrode one or more, thus resistance R 1 and R2 obtained according to these change detected values.And the utility model improves measuring accuracy through the self-capacitance that is formed by the touch point being carried out twice charging to offset some immeasurablel physical parameter or to reduce the measurement of physical quantity.
Need to prove; In the embodiment of the utility model; Above-mentioned first electrode is identical with the function of second electrode, and the two can exchange, therefore in the above-described embodiments; Both can also can need electric current through first resistance and this requirement of second resistance as long as can satisfy when charging, discharge or detection from first electrode detection from second electrode detection.
In the embodiment of the utility model, can apply correspondent voltage to a plurality of sensing units successively with the mode of scanning, when detecting, also can detect successively simultaneously with the mode of scanning.
As shown in Figure 4, be the touch detecting method process flow diagram of the utility model embodiment, this process flow diagram combines schematic diagram shown in Figure 3 together to describe.This method may further comprise the steps:
Step S401 is with first electrode grounding of a sensing unit in a plurality of sensing units and apply high level signal to second electrode and carry out first time with the self-capacitance that when a sensing unit is touched, a sensing unit is produced and charge.In this embodiment, apply high level signal Vcc to second electrode.
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 through the high level signal Vcc that applies, the voltage that be applied on the self-capacitance this moment is V1=VccR1/ (R1+R2).In addition, in the embodiment of the utility model,, can also improve the accuracy of detection of self-capacitance through charging to self-capacitance.
In an embodiment of the utility model, if this sensing unit is not touched, therefore the then follow-up existence that can't detect self-capacitance can judge that it is not touched.In the embodiment of the utility model, can apply correspondent voltage to a plurality of sensing units successively with the mode of scanning, when detecting, also can detect successively simultaneously with the mode of scanning.
Step S402 is with first electrode of a sensing unit and at least one ground connection in second electrode.Particularly, for example with first electrode and the equal ground connection of second electrode of a sensing unit, perhaps with first electrode grounding, second electrode breaks off, and perhaps with second electrode grounding, first electrode breaks off, self-capacitance is carried out the discharge first time.
Step S403 detects to obtain charging for the first time and the first change detected value between the discharge for the first time from first electrode of correspondence or second electrode.In the embodiment of the utility model, described correspondence is meant following situation, for example, when first electrode of a sensing unit and the equal ground connection of second electrode are discharged, all can detect from first electrode and second electrode; As when first electrode grounding, when second electrode breaks off, then can only be from first electrode detection; Otherwise, when second electrode grounding, when first electrode breaks off, then can only be from second electrode detection.
In the present embodiment, suppose that the first change detected value is Δ Q1.Below be that the change in electrical charge amount is that example is described with the first change detected value and the second change detected value, but can reaction resistance R1 and R2 between other change detected values of concerning, for example level signal, electric current etc. also all can adopt.
Wherein, Δ Q1=V1C1=VccC1R1/ (R1+R2) (1)
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 discharging for the first time and obtain.
Step S404 applies high level signal self-capacitance is carried out the charging second time with first electrode grounding of a sensing unit in a plurality of sensing units and to second electrode.In this embodiment; Apply high level signal Vcc to second electrode; High level signal Vcc through applying just can charge to self-capacitance, and the voltage that be applied on the self-capacitance this moment is V1=VccR1/ (R1+R2), so the quantity of electric charge on the self-capacitance is V1C1=VccC1R1/ (R1+R2).
Step S405; First electrode and second electrode to a sensing unit apply high level signal; Perhaps; One in said first electrode and said second electrode applies high level signal also with another disconnection in said first electrode and said second electrode, so that self-capacitance is charged for the third time.
In the utility model embodiment, can all apply high level signal to first electrode and second electrode; Perhaps, apply high level signal, and second electrode breaks off to first electrode; Perhaps, second electrode is applied high level signal, and first electrode breaks off.Be pointed out that in addition,,, all do not influence derivation so the high level signal that is applied for twice can be identical or inequality because the high level signal that applies is a known quantity.In this embodiment, to first electrode and/or second electrode apply with step S401 and step S404 in identical high level signal Vcc.The voltage that be applied on the self-capacitance this moment is Vcc.
Step S406 detects to obtain charging for the second time and the second change detected value between the charging for the third time from first electrode of correspondence or second electrode.In the present embodiment, suppose that the second change detected value is Δ Q2.The second change detected value need adopt with step S403 in the identical change detected value of the first change detected value, promptly in the utility model embodiment, be the change in electrical charge amount.Likewise, said " corresponding " also be relative notion, for example when charging for the third time,, then can only detect from first electrode if second electrode breaks off.
In the embodiment of the utility model,, just can cause the variation of the quantity of electric charge in the self-capacitance as long as the mode of charging is different with the mode of charging for the second time for the third time.The voltage that be applied on the self-capacitance this moment is Vcc; Because Vcc=V1+V2; Therefore, just can calculate difference Vcc and V1 between through the second change detected value (for example change in electrical charge value) between charging for the third time and the charging second time this moment, obtains voltage V2 thereby calculate.
Wherein, Δ Q2=VccC1-V1C1=V2C1 (2)
Step S407; Calculate first resistance and the proportionate relationship of second resistance between self-capacitance to the second electrode between self-capacitance to the first electrode according to the first change detected value and the second change detected value, and confirm touch location according to the proportionate relationship of first resistance and second resistance.In an embodiment of the utility model; The represented self-capacitance change in electrical charge amount in through type (1) and (2) can calculate the proportionate relationship of R1 and R2; Because the regular linear of figure concerns, then can calculate the position of the horizontal ordinate at place, touch point, and the position at self-capacitance C1 place.
In the embodiment of the utility model, therefore R1/R2=V1/V2=Δ Q1/ Δ Q2 just can obtain the proportionate relationship between R1 and the R2 through the utility model embodiment.
In the embodiment of the utility model, if sensing unit is door shape sensing unit or L shaped sensing unit, then just can confirm the touch location on touch-screen through the ratio between first resistance and second resistance, below will combine concrete example to detail.But in other embodiment of the utility model; 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 (the 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 confirm the touch location on second direction according to the position of sensing unit.In an embodiment of the utility model, 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 is provided with.
Be pointed out that; The order of the above-mentioned charge and discharge process first time (step S401-step S403) and second and third time charging process (step S404-step S406) can intermodulation; Promptly carry out step S404-step S406 earlier; Carry out step S401-step S403 again, do not depart from the thought of the utility model too, be included within the protection domain of the utility model.
In the embodiment of the utility model, the self-capacitance detection means can be known self-capacitance detection means at present, therefore repeats no more at this.
In an embodiment of the utility model,, then, therefore can not increase the overall power of chip because two self-capacitance detection means can shared a plurality of devices if adopt two self-capacitance detection means.
In an embodiment of the utility model, sensing unit can take different shapes.Preferably, a plurality of disjoint sensing units are positioned at same one deck, thereby under the situation that guarantees accuracy of detection, can greatly save cost.
Synoptic diagram as shown in Figure 5, as to be touched for the rectangle sensing unit of the utility model embodiment.This sensing unit is a rectangle, and the first direction of a plurality of sensing unit and said 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 an embodiment of the utility model.This sensing unit 200 comprises a plurality of firsts 230 and a plurality of parallel second portions 240; Wherein, Link to each other through second portion 240 between the adjacent first 230; To form a plurality of first groove 1000 and second grooves of alternately arranging 2000, wherein, the opening direction of a plurality of first grooves 1000 and a plurality of second grooves 2000 is opposite.Preferably, second portion 240 is arranged along first direction.In an embodiment of the utility model, a plurality of firsts 230 can be parallel to each other, also can be not parallel.And preferably, second portion 240 is a rectangle.In other embodiment of the utility model, first 230 also can be rectangle, but first 230 also can be other multiple shape.In this embodiment, through the impedance of first's 230 increase resistance, thereby the impedance that increases sensing unit 200 makes win resistance and the easier detection of second resistance, improves 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 an embodiment of the utility model, 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 be provided with.
In the embodiment of the utility model, the size of sensing unit 200 length directions and the size basically identical of substrate, so contactor control device is simple in structure, makes easily, and low cost of manufacture.
In an embodiment of the utility model, first electrode 210 and second electrode 220 respectively with a plurality of firsts 230 in two firsts link to each other.But in another embodiment of the utility model, first electrode 210 and second electrode 220 respectively with a plurality of second portions 240 in two second portions link to each other, shown in Fig. 6 b.
And in the embodiment of the utility model, vertical each other between second portion 240 and the first 230, the angle between the two is preferably 90 degree, also can select other angles certainly.Shown in Fig. 6 a, this sensing unit 200 joins end to end a plurality of firsts 230 through a plurality of second portions 240, and first electrode 210 of sensing unit 200 links to each other with the first 230 at two ends respectively with second electrode 220.See that from one-piece construction this sensing unit 200 is for having the rectangle than the aspect ratio.This need to prove, though in Fig. 6 a, sensing unit 200 is provided with along the X axle, it will be understood by those skilled in the art that this sensing unit 200 also can be along the setting of Y axle.Structure through this sensing unit can reduce noise effectively, improves the linearity of induction.
Shown in Fig. 7 a, be the sensing unit structural drawing of another embodiment of the utility model.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 said sensing unit comprises third part 250, disjoint the 4th part 260 and the 5th part 270.Preferably; Third part 250 is parallel with first limit 110 of substrate 100; The 4th part 260 is parallel with second limit 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 first electrode, 210, the five parts 270 has second electrode 220, and wherein, each first electrode 210 all links to each other with the corresponding pin of touch-screen control chip with second electrode 220.
In the embodiment of the utility model; The so-called mutually nested sensing unit in the outside that is meant partly surrounds inboard sensing unit, for example shown in Fig. 7 a, can when guaranteeing precision, reach bigger coverage rate like this; And reduce the complexity of computing, improve the response speed of touch-screen.Certainly those skilled in the art also can adopt other mutually nested modes to arrange sensing unit according to the thought of Fig. 7 a.In an embodiment of the utility model; 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 an embodiment of the utility model, at least one is a rectangle in third part 250, the 4th part 260 and the 5th part 270 of sensing unit 200, 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 an embodiment of the utility model, the 4th part 260 of each sensing unit 200 and the 5th part 270 equal in length.
In an embodiment of the utility model, substrate 100 is a rectangle, and is vertical each other between first limit 110 and second limit 120, and vertical each other between the 4th part 260 and the third part 250, vertical each other between the 5th part 270 and the third part 250.
In an embodiment of the utility model; 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, thereby improve arithmetic speed through first limit 110 and second limit 120 of 200 pairs of touch-screens of a plurality of sensing units.Certainly in other embodiment of the utility model, 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,, therefore can the spacing between the sensing unit at touch screen center position be reduced, thereby improve the accuracy of detection in centre because the user often touches the centre of touch-screen.
In an embodiment of the utility model, a plurality of sensing units 200 are with respect to the central shaft Y of substrate 100 symmetry, and shown in Fig. 7 a, central shaft Y is perpendicular to third part 250, thereby more helps improving precision.
Shown in Fig. 7 a, in this embodiment, first electrode 210 of sensing unit 200 and second electrode 220 all are positioned on first limit 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; Above-mentioned Fig. 7 a is the more excellent embodiment of the utility model; It can obtain bigger coverage rate, but other embodiment of the utility model 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.
Sensing unit among the utility model embodiment adopts the structure of similar door shape, and is not only simple in structure, is convenient to make, and institute is leaded, and easy design reduces silver slurry cost and making easily all together on one side, has very great help to reducing production cost.
As shown in Figure 8, the synoptic diagram when being touched for the sensing unit of the utility model embodiment.Can know that from Fig. 8 first electrode is that 210, the second electrodes are 220; Touch location approaches 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 first resistance and second resistance is 4: 1, and promptly the length of first electrode 210 to the touch location (being embodied by first resistance) is 80% of whole sensing unit length.In other words, the touch point is positioned at the position of 8 unit lengths in distance first electrode, 210 places, knows, the touch point is positioned at the position of 2 unit lengths in distance second electrode, 220 places.When finger moved, touch location can correspondingly move, and therefore just can judge finger corresponding mobile track through the conversion of touch location, thus the input instruction of judges.
Can find out that from the above example of Fig. 8 the account form of the utility model is very simple, therefore can greatly improve the reaction velocity that touch-screen detects.In the embodiment of the utility model; Usually finger or other objects can touch a plurality of sensing units; Can obtain in a plurality of sensing units that this is touched the touch location of each this moment earlier, then through asking average mode to calculate final touch location on touch-screen.
Shown in Fig. 9 a, be another embodiment Touch-screen testing equipment structural drawing of the utility model.In an embodiment of the utility model, the length of a plurality of sensing units increases gradually, and each said sensing unit comprises the 6th part 280 and the 7th part 290.The end that one end of the 6th part 280 has 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 second electrode 220.
Particularly, the 6th part 280 is parallel with first limit 110 of substrate 100, and the 7th part 290 is parallel with second limit 120 of substrate 100, and first limit 110 is adjacent with second limit 120.And each first electrode 210 all links to each other with the corresponding pin of touch-screen control chip with second electrode 220.
In the preferred embodiment of the utility model, 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 improve the coverage rate of sensing unit effectively through such setting to touch-screen.In an embodiment of the utility model, at least one is a 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 utility model embodiment 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, when touching detection, can realize the location to the touch point through sensing unit self.
What is more important, ratio realizes confirming of touch location to the utility model between first resistance and second resistance through calculating, therefore with respect to present rhombus or triangular design; Because when confirming touch location; Need not to calculate the size of self-capacitance, and the size of self-capacitance can not influence the precision of touch location, the dependence of self-capacitance accuracy of detection is reduced; Thereby improved measuring accuracy, improved the linearity.In addition; Because any rectangle that all can be regular shape in the 5th part 270, the 6th part 280 and the 7th part 290 of the utility model embodiment; Therefore with respect to irregular shapes such as present rhombus or triangles, also can improve the linearity further.
In an embodiment of the utility model, 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 a rectangle, and is vertical each other between first limit 110 and second limit 120.First limit 110 is vertical each other with second limit 120; Not only make the sensing unit design regular more; For example make between the 6th part 280 and the 7th part 290 of sensing unit also vertical each other; Thereby improve coverage rate, and vertically also can improve the linearity of detection each other between the 6th part 280 and the 7th part 290 touch-screen.
In an embodiment of the utility model, the spacing between adjacent two sensing units 200 equates.So just can evenly divide, thereby improve arithmetic speed through first limit 110 and second limit 120 of 200 pairs of touch-screens of a plurality of sensing units.
Certainly in another embodiment of the utility model; Spacing between adjacent two sensing units 200 can not wait yet; Shown in Fig. 9 b; For example, therefore can the spacing between the sensing unit at touch screen center position be reduced, thereby improve the accuracy of detection in centre because the user often touches the centre of touch-screen.
Shown in Fig. 9 a, in this embodiment, first electrode 210 of sensing unit 200 is positioned on first limit 110 of substrate 100, and second electrode 220 is positioned on second limit 120 of substrate 100, and first limit 110 is vertical each other with second limit 120.In this embodiment, detect after the touch location on sensing unit, can obtain the touch location on touch-screen.
Shown in figure 10, the synoptic diagram when being touched for the sensing unit of the utility model embodiment.Can know that from Figure 10 first electrode is that 210, the second electrodes are 220; Touch location approaches 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 first resistance and second resistance is 9: 1, and promptly the length of first electrode 210 to the touch location (being embodied by first resistance) is 90% of whole sensing unit length.In other words, the touch point is positioned at the position of 9 unit lengths in distance first electrode, 210 places, knows, the touch point is positioned at the position of 1 unit length in distance second electrode, 220 places.
Can find out that from the above example of Figure 10 the account form of the utility model is very simple, therefore can greatly improve the reaction velocity that touch-screen detects.
In an embodiment of the utility model, a plurality of sensing units 200 are positioned at same one deck, 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 utility model embodiment 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, when touching detection, can realize the location to the touch point through sensing unit self.
What is more important, ratio realizes confirming of touch location to the utility model between first resistance and second resistance through calculating, therefore with respect to present rhombus or triangular design; Because when confirming touch location; Need not to calculate the size of self-capacitance, and the size of self-capacitance can not influence the precision of touch location, the dependence of self-capacitance accuracy of detection is reduced; Thereby improved measuring accuracy, improved the linearity.In addition; Because any rectangle that all can be regular shape in the 5th part 270, the 6th part 280 and the 7th part 290 of the utility model embodiment; Therefore with respect to irregular shapes such as present rhombus or triangles, also can improve the linearity further.
In sum; The utility model embodiment applies level signal through the electrode to the sensing unit two ends; If this sensing unit is touched; Then can form self-capacitance by this sensing unit, so the utility model can charge through the level signal that applies to this self-capacitance, and confirm the touch location on first direction according to the proportionate relationship between first resistance and second resistance.For example in an embodiment of the utility model; Proportionate relationship between first resistance and second resistance is according to said self-capacitance charge/discharge the time, from said first electrode and/or second electrode detects first detected value of acquisition and the proportionate relationship between second detected value calculates.First detected value and second detected value that produce during therefore from first electrode and/or this self-capacitance charge/discharge of second electrode detection.Like this, just can react the position that the touch point is positioned at this sensing unit, thereby further confirm the position of touch point at touch-screen through first detected value and second detected value.
For the sensing unit of Fig. 5 and Fig. 6, after having confirmed the touch location on the first direction, also need further to confirm the touch location on second direction according to the position of the sensing unit that is touched.In the embodiment of the utility model, can be with reference to shown in Fig. 5 and 6, if first detected value or second detected value that detect certain sensing unit explain then that greater than predetermined threshold value 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, confirm the position of touch point on touch-screen according to 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 carried out brief account.
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, to this array scan with checking given sensing station be effectively, be to be greater than preset touch threshold for the requirement of the adjacent sensing unit signal of some.After finding the strongest signal, this signal all is used for computing center with those closing signals greater than touch threshold:
Wherein, Ncent is the label of center sensing unit, and 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:
Shown in figure 11, be the contactor control device synoptic diagram of an embodiment of the utility model.This contactor control device comprises touch screen detection device, the touch-screen control chip 300 that is made up of substrate 100 and a plurality of disjoint sensing units 200.Wherein, A part of pin in the touch-screen control chip 300 links to each other with 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 second electrode 220 of a plurality of sensing units 200; And touch-screen control chip 300 applies level signal to 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.
Shown in figure 12, be the structural drawing of the utility model embodiment touch-screen control chip.Touch-screen control chip 300 comprises charging device 310, discharge device 320, detection means 330 and control and calculating device 340.Charging device 310 is in first time charging process, with first electrode, 210 ground connection of a sensing unit 200 in a plurality of sensing units and apply high level signal to second electrode 220 and charge with the self-capacitance that when a sensing unit 200 is touched, a sensing unit 200 is produced; In second time charging process, with first electrode, 210 ground connection of a sensing unit 200 in a plurality of sensing units and to second electrode 220 apply high level signal with when a sensing unit 200 is touched so that self-capacitance is charged; And in charging process for the third time; First electrode 210 and second electrode 220 to a sensing unit 200 apply high level signal; Perhaps; In first electrode 210 and second electrode 220 one applies high level signal and with another disconnection in first electrode 210 and second electrode 220, so that self-capacitance is charged for the third time.Discharge device 320 discharges first electrode and at least one ground connection in second electrode of sensing unit 200 after 310 pairs of self-capacitances of charging device charge for the first time self-capacitance is carried out the first time.Detection means 330 is used for when discharging and recharging at every turn, detects to obtain charging for the first time and the first change detected value between the discharge and charging for the second time for the first time and the second change detected value between the charging for the third time from first electrode 210 of correspondence or second electrode 220.
Control and calculating device 340 are used for charging device 310, discharge device 320, detection means 330 are controlled; And calculate first resistance and the proportionate relationship of second resistance between self-capacitance to said second electrode between self-capacitance to the first electrode, and confirm touch location according to the proportionate relationship of first resistance and second resistance according to the first change detected value and the second change detected value.
In the embodiment of the utility model; Usually finger or other objects can touch a plurality of sensing units; This moment control and calculating device 340 can obtain in a plurality of sensing units that this is touched the touch location of each earlier, then through asking average mode to calculate final touch location on touch-screen.In the embodiment of the utility model; Control and calculating device 340 can be controlled charging device 310 with the mode of scanning and apply correspondent voltage to a plurality of sensing units successively; When detecting, also can detect successively simultaneously with the mode of scanning; The mode that perhaps, also can scan is controlled discharge device 320 and successively the self-capacitance that sensing unit produced that is touched in a plurality of sensing units is discharged.
In an embodiment of the utility model, the first change detected value, the second change detected value can be one or more in current detecting changing value, self-capacitance change detected value, level signal change detected value and the change in electrical charge amount.
In an embodiment of the utility model, detection means 330 is CTS (a capacitance detecting device).
In an embodiment of the utility model; Control and calculating device 340 also are used for confirming the touch location on second direction according to the position of the sensing unit 200 that is touched, and confirm the position of said touch point on touch-screen according to touch location on the first direction and the touch location on the second direction.Particularly, control and calculating device 340 are confirmed the touch location on the said second direction through centroid algorithm.
In an embodiment of the utility model, 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 is provided with or the vertical parallel setting.
In a preferred embodiment of the utility model, a plurality of disjoint sensing units are positioned at same one deck, thereby under the prerequisite that guarantees accuracy of detection, reduce manufacturing cost effectively.
The utility model has also proposed a kind of portable electric appts, comprises aforesaid contactor control device.
The utility model embodiment applies level signal through 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 utility model can charge to this self-capacitance through the level signal that applies, and confirms the touch location on the touch-screen according to the proportionate relationship between first resistance and second resistance.And, offsetting some immeasurablel physical parameter or to reduce the measurement of physical quantity, thereby under the prerequisite that guarantees detection speed, improve accuracy of detection effectively through the detection mode that self-capacitance is carried out twice charging of the utility model embodiment.
The utility model embodiment has proposed a kind of self-capacitance detection mode of novelty; When sensing unit is touched; The touch point just can be divided into two resistance with this sensing unit, thereby is carrying out considering when self-capacitance detects that these two resistance just can confirm the position of touch point on this sensing unit.The utility model embodiment's is simple in structure; And for a sensing unit; Can carry out charge or discharge from its first electrode and/or 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 squint.In addition, the property that the utility model embodiment can also effectively the improve circuit ratio of making an uproar reduces circuit noise, improves the induction linearity.In addition; In testing process because the sensing unit that is touched is charged; Therefore wherein can produce little electric current; Can eliminate of the influence of Vcom level signal well, therefore can correspondingly eliminate screenmask layer and concerned process steps, thereby can when having strengthened antijamming capability, further reduce cost the self-capacitance of sensing unit generation in the touch-screen.
In the description of this instructions, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means the concrete characteristic, structure, material or the characteristics that combine this embodiment or example to describe and is contained among at least one embodiment or example of the utility model.In this manual, the schematic statement to above-mentioned term not necessarily refers to identical embodiment or example.And concrete characteristic, structure, material or the characteristics of description can combine with suitable manner in any one or more embodiment or example.
Although illustrated and described the embodiment of the utility model; For those of ordinary skill in the art; Be appreciated that under the situation of principle that does not break away from the utility model and spirit and can carry out multiple variation, modification, replacement and modification that the scope of the utility model is accompanying claims and be equal to and limit to these embodiment.
Claims (9)
1. a contactor control device is characterized in that, comprising:
Substrate;
A plurality of disjoint sensing units, said a plurality of sensing units are formed on the said substrate, and the two ends of each sensing unit have first electrode and second electrode respectively;
The touch-screen control chip, said touch-screen control chip comprises charging device, discharge device, detection means and control and calculating device, wherein,
Said charging device; Be used in the charging process first time, with first electrode grounding of a sensing unit in said a plurality of sensing units and apply high level signal to second electrode and charge with the self-capacitance that when a said sensing unit is touched, a said sensing unit is produced; In second time charging process, apply high level signal so that said self-capacitance is charged with first electrode grounding of a sensing unit in said a plurality of sensing units and to second electrode; And in charging process for the third time; First electrode and second electrode to a said sensing unit apply high level signal; Perhaps; One in said first electrode and said second electrode applies high level signal also with another disconnection in said first electrode and said second electrode, so that said self-capacitance is charged for the third time
Said discharge device is used for after said charging device charges to said self-capacitance for the first time, with first electrode of a said sensing unit and at least one ground connection in second electrode, and so that said self-capacitance is discharged,
Said detection means; Be used for detecting to obtain the first change detected value between the said charging first time and the said first time of the discharge from said first electrode or second electrode of correspondence; And detect obtaining the said charging second time and the said second change detected value between the charging for the third time from said first electrode of correspondence or second electrode, and
Said control and calculating device; Be used for said charging device, discharge device, detection means are controlled; And calculate first resistance and the proportionate relationship between second resistance between said self-capacitance to said second electrode between said self-capacitance to said first electrode, and confirm touch location according to the proportionate relationship between said first resistance and said second resistance according to the first change detected value and the second change detected value.
2. contactor control device as claimed in claim 1 is characterized in that, said detection means is capacitance detecting device CTS.
3. contactor control device as claimed in claim 1 is characterized in that, said sensing unit is a rectangle, and the first direction along said touch-screen is parallel to each other between said a plurality of sensing unit, and said touch location is the touch location on said first direction.
4. contactor control device as claimed in claim 1 is characterized in that, said sensing unit comprises:
A plurality of firsts and a plurality of parallel second portions; Wherein, Link to each other through said second portion between the adjacent said first, to form a plurality of first groove and second grooves of alternately arranging, wherein; The opening direction of said a plurality of first groove and said a plurality of second grooves is opposite, and said touch location is for touching the touch location of object on said first direction.
5. like claim 3 or 4 described contactor control devices, it is characterized in that said first direction is the length direction of said sensing unit, second direction is the direction perpendicular to said sensing unit, and said sensing unit horizontal parallel is provided with or the vertical parallel setting.
6. contactor control device as claimed in claim 1 is characterized in that, said a plurality of disjoint sensing units are positioned at same one deck.
7. contactor control device as claimed in claim 1 is characterized in that, said sensing unit comprises:
Third part;
Disjoint the 4th part and the 5th part; Said the 4th part one end links to each other with an end of said third part; One end of said the 5th part links to each other with the other end of said third part; The said tetrameric other end has said first electrode, and the other end of said the 5th part has said second electrode.
8. contactor control device as claimed in claim 1 is characterized in that, said sensing unit comprises:
The 6th part, an end of said the 6th part has said first electrode;
The 7th part, an end of said the 7th part links to each other with the other end of said the 6th part, and the other end of said the 7th part has said second electrode.
9. a portable electric appts is characterized in that, comprises each described contactor control device like claim 1-8.
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