CN106886327A - The measuring signal method and apparatus of touch-screen - Google Patents

Abstract

The present invention includes drive circuit, there is provided a plurality of arranged in parallel one or one group driving conductive bar driving conductive bar in the middle of of the drive signal to touch-screen；Circuit for detecting, when each drive signal is provided, the signal of at least one detecting conductive bar in the middle of the detecting conductive bar a plurality of arranged in parallel according to one of multigroup parameter group by touch-screen is provided the assessment signal of the driving conductive bar of drive signal to produce；And control circuit, one group of initial parameter group as benchmark conductive bar is selected by described parameter group, using the assessment signal that is produced by circuit for detecting according to initial parameter group as flat calibration signal, and select each or each group initial parameter group of non-referenced conductive bar respectively by parameter group.Different detection parameters are given in different the drivings conductive bar of correspondence so that the signal detected according to each detection parameters of driving conductive bar can try one's best convergence, the signal optimization or levelized of the image to touch-screen can be allowed to detect.

Description

The measuring signal method and apparatus of touch-screen

The present invention is application number：201310320729.2, the applying date：The divisional application of female case 2013.7.26.

Technical field

Quasi- image is put down the invention relates to the method for measurement and device of a kind of capacitive touch screen, particularly a kind of generation Capacitive touch screen method for measurement and device.

Background technology

Capacitive touch screen is, through the capacitive couplings and between human body, to cause detection signal to produce change, so as to judge Go out the position that human body is touched on capacitive touch screen.When human body is touched, the noise of human body local environment also can be with human body Capacitive couplings injection between capacitive touch screen, also produces change to detection signal.Again because noise is constantly in change, and It is not easy to be predicted, when signal to noise ratio is smaller, easily causes and can not judge to touch, or the touch location deviation judged.

Further, since signal passes through some load circuits, such as by capacitive couplings, the signal that receives of detecting conductive bar and Being supplied to the signal before driving conductive bar can produce phase difference.When the cycle of drive signal is all identical, different phase meters Show that the signal delay different time is received, if ignoring the foregoing direct detection signal of phase difference, measuring signal can be caused Start phase difference and produce Different Results.If the result difference that the different conductive bars of correspondence are measured is very big, can cause to be difficult to Judge correct position.

Additionally, the resistance of the resistor capacitor circuit passed through relative to different driving conductive bars, drive signal is likely to not Together, the value height of the image obtained by touch-screen when mutual capacitance type can be caused to detect is low, is unfavorable for detecting.

As can be seen here, above-mentioned existing capacitive touch screen is upper with use in structure, it is clear that still suffered from inconvenience and defect, And be urgently further improved.Therefore a kind of measuring signal method and apparatus of the touch-screen of new structure how is founded, Also turning into current industry pole needs improved target.

The content of the invention

It is an object of the present invention to overcome the defect that existing capacitive touch screen is present, and provide a kind of new structure Touch-screen measuring signal method and apparatus, technical problem to be solved be make its different driving conductive bars of correspondence to From different detection parameters so that the signal detected according to the detection parameters of each driving conductive bar can try one's best convergence, to The signal of image that touch-screen detects can be allowed to optimize or levelized (best leveling).

The object of the invention to solve the technical problems is realized using following technical scheme.Proposed according to the present invention A kind of touch-screen measuring signal device, it includes drive circuit, there is provided drive signal is to a plurality of arranged in parallel of touch-screen One or one group of driving conductive bar driving in the middle of conductive bar, wherein one of described driving conductive bar or one group of driving are led Conductive bar on the basis of electric bar, and it is non-referenced conductive bar that other or other group drives conductive bar；

Circuit for detecting, when each drive signal is provided, according to one of multigroup parameter group by a plurality of of the touch-screen The signal of at least one detecting conductive bar in the middle of detecting conductive bar arranged in parallel is provided being somebody's turn to do for the drive signal to produce The assessment signal of conductive bar is driven, wherein described driving conductive bar overlaps on multiple crossover regions with described detecting conductive bar； And control circuit, one group of initial parameter group as the benchmark conductive bar is selected by described parameter group, with initial according to this The assessment signal that parameter group is produced by the circuit for detecting selects each respectively as flat calibration signal by described parameter group Bar or each group of initial parameter group of the non-referenced conductive bar, each of which or each group of non-referenced conductive bar are first according to this The assessment signal that beginning parameter group is produced is compared to assessment signal produced according to other parameter groups closest to the flat calibration signal.

The object of the invention to solve the technical problems can also be applied to the following technical measures to achieve further.

One of the measuring signal device of foregoing touch-screen, wherein the control circuit parameter group sequentially according to is respectively Produce the assessment signal of the benchmark conductive bar by the circuit for detecting, and this with the maximum benchmark conductive bar that produces is commented The parameter group of signal institute foundation is estimated as the initial parameter group of the benchmark conductive bar.

One of the measuring signal device of foregoing touch-screen, wherein the control circuit parameter group sequentially according to is respectively Produce the assessment signal of the benchmark conductive bar by the circuit for detecting, and with first qualified benchmark conductive bar The parameter group of the assessment signal institute foundation as the benchmark conductive bar the initial parameter group.

The measuring signal device of foregoing touch-screen, the wherein assessment signal are produced by one of described detecting conductive bar It is raw.

The measuring signal device of foregoing touch-screen, the wherein assessment signal are by least the two of described detecting conductive bar The signal of bar is added up and produced.

The measuring signal device of foregoing touch-screen, the signal of the wherein detecting conductive bar extremely should via a variable resistor Circuit for detecting, the wherein circuit for detecting be according to be provided drive signal the conductive bar the initial parameter group come change this can Become the resistance of resistance.

The measuring signal device of foregoing touch-screen, the wherein variable resistor are built into integrated circuit.

The measuring signal device of foregoing touch-screen, the wherein circuit for detecting are according to the conduction for being provided drive signal The initial parameter group of bar changes time of detection signal.

The measuring signal device of foregoing touch-screen, the signal of the wherein detecting conductive bar is carried after amplifying via amplifier The circuit for detecting is supplied to, the wherein circuit for detecting is changed according to the initial parameter group for the conductive bar for being provided drive signal Become the multiplying power of amplifier amplification.

The measuring signal device of foregoing touch-screen, the wherein circuit for detecting are just to start to measure after postponing phase difference The signal of the described at least detecting conductive bar, the wherein circuit for detecting are being somebody's turn to do according to the conductive bar for being provided drive signal Initial parameter group changes the delay phase difference.

The present invention has clear advantage and beneficial effect compared with prior art.From above technical scheme, this hair Bright main technical content is as follows：In resistor capacitor circuit (RC circuit), signal can be because the load passed through be different It is variant.The purpose of the present invention gives different detection parameters in the different driving conductive bar of correspondence so that according to each drive The signal of the detection parameters detecting of moving conductive bar can be tried one's best convergence, and the signal of the image to touch-screen can be allowed to detect is optimized Or levelized (best leveling).According to a kind of measuring signal device of touch-screen proposed by the present invention, including：Touch-screen, Touch-screen includes a plurality of conductive bar that a plurality of driving conductive bar arranged in parallel is constituted with a plurality of detecting conductive bar arranged in parallel, Described driving conductive bar overlaps on multiple crossover regions with described detecting conductive bar；Drive circuit, there is provided drive signal gives one Bar or one group of driving conductive bar, wherein conductive bar on the basis of of described driving conductive bar or one group of driving conductive bar, and And it is non-referenced conductive bar that other or other group drives conductive bar；With circuit for detecting, when each drive signal is provided, according to The assessment that the driving conductive bar for being provided drive signal is produced by the signal at least detecting conductive bar according to one of multigroup parameter group is believed Number；And control circuit, one group of initial parameter group as benchmark conductive bar is selected by described parameter group, with according to initial ginseng The assessment signal that array is produced by circuit for detecting selects each or every respectively as flat calibration signal by described parameter group One group of initial parameter group of non-referenced conductive bar, each of which or each group of non-referenced conductive bar are produced according to initial parameter group Assessment signal compared to the assessment signal produced according to other parameters groups closest to flat calibration signal.According to proposed by the present invention one The measuring signal method of touch-screen is planted, including：Touch-screen is provided, touch-screen includes a plurality of driving conductive bar arranged in parallel and puts down The a plurality of conductive bar of a plurality of detecting conductive bar composition of row arrangement, described drives conductive bar overlapping with described detecting conductive bar In multiple crossover regions；One of described driving conductive bar or one group of driving conductive bar are selected as benchmark conductive bar, other Or other groups drive conductive bar as non-referenced conductive bar；Drive signal is provided and gives benchmark conductive bar, and according to the parameter One of group detects the signal of at least one described detecting conductive bar；In described at least one signal for detecting conductive bar not When in the range of preset signals, the letter of at least one described detecting conductive bar is sequentially detected according to one of other parameters group Number, until the signal of at least one described detecting conductive bar falls in the range of preset signals；Drive is provided with benchmark conductive bar At least one detecting conductive bar described in during dynamic signal falls within signal in the range of preset signals as flat calibration signal, and with base The parameter group of quasi- conductive bar foundation as benchmark conductive bar initial parameter group；Drive signal is sequentially provided respectively to each or Each group of non-referenced conductive bar；When each or each group of non-referenced conductive bar are provided drive signal, sequentially foundation is distinguished Described parameter group detects the signal of at least one described detecting conductive bar；And determine in each or each group of non-base The initial parameter group of quasi- conductive bar, wherein drive signal value is provided in each or each group of non-referenced conductive bar respectively, according to Described compared to according to the detecting of other parameters group according to the signal of at least one described detecting conductive bar of initial parameter group detecting The signal of at least one detecting conductive bar is closest to flat calibration signal.

By above-mentioned technical proposal, the measuring signal method and apparatus of inventive touch screen at least has following advantages and has Beneficial effect：The different driving conductive bars of correspondence give different detection parameters, can allow shade that touch-screen detects signal most Goodization or levelized.

Described above is only the general introduction of technical solution of the present invention, in order to better understand technological means of the invention, And can be practiced according to the content of specification, and in order to allow the above and other objects of the present invention, feature and advantage can Become apparent, below especially exemplified by preferred embodiment, and coordinate accompanying drawing, describe in detail as follows.

Brief description of the drawings

Fig. 1 and Fig. 4 is the schematic diagram of condenser type touch screen of the invention and its control circuit；

Fig. 2A is the schematic diagram of single electrode drive pattern；

The schematic diagram of the bipolar electrode drive pattern of Fig. 2 B and Fig. 2 C；

Fig. 3 A and Fig. 3 B are the schematic flow sheet of the method for detecting of detecting capacitance type touch-screen of the invention；

Fig. 5 is the schematic diagram for producing complete image；

Fig. 6 is to produce the schematic diagram for inside contracting image；

Fig. 7 A and Fig. 7 B are to produce the schematic diagram for extending out image；And

Fig. 8 is that the present invention produces the schematic flow sheet for extending out image；

Fig. 9 A and Fig. 9 B are the schematic diagram that drive signal produces out of phase difference via different driving conductive bar；

Figure 10 and Figure 11 is the schematic flow sheet of the measuring signal method according to the touch-screen of the first embodiment of the present invention； And

Figure 12 according to the measuring signal method of another touch-screen of the invention schematic flow sheet.

【Main element symbol description】

11：Frequency circuit 12：Pulse width adjusting circuit

131：Driving switch 132：Detection switch

141：Drive selection circuit 142：Detecting selection circuit

151：Driving electrodes 152：Detecting electrode

16：Variable resistor 17：Amplifying circuit

18：Measurement circuit 19：External conductive object

41：Drive circuit 42：Circuit for detecting

43：Storage circuit 44：Frequency setting

45：Control circuit 51：Complete image

52：The dimension sensitive information that single electrode drives

62：The dimension sensitive information that bipolar electrode drives

61：Inside contract image 71：Extend out image

721：The dimension sensitive information that first side single electrode drives

722：The dimension sensitive information that second side single electrode drives

S：Drive signal

Specific embodiment

Further to illustrate the present invention to reach technological means and effect that predetermined goal of the invention is taken, below in conjunction with Accompanying drawing and preferred embodiment, to according to the measuring signal method and apparatus of touch-screen proposed by the present invention its specific embodiment, Structure, feature and its effect, describe in detail as after.

Capacitive touch screen is highly susceptible to noise jamming, especially from touching the human body in touch-screen.The present invention Being reached using the type of drive of adaptability reduces the purpose of noise jamming.

In capacitive touch screen, including a plurality of longitudinal direction and transversely arranged electrode, for detecting the position of touch, wherein Number of electrodes and the voltage positive correlation of driving that the consumption of electric power drives with the same time.When detecting touch, noise may As the conductor for touching is conducted to capacitive touch screen so that signal to noise ratio (S/N ratio) is deteriorated, and easily causes the erroneous judgement of touch With position deviation.In other words, signal to noise ratio can dynamically change with the object for touching with residing environment.

Refer to Fig. 1, be condenser type touch screen of the invention and its control circuit schematic diagram, including frequency circuit 11, Pulse width modulation circuit 12, driving switch 131, detection switch 132, drive selection circuit 141, detecting selection circuit 142, extremely Few driving electrodes 151, at least detecting electrode 152, variable resistor 16, amplifying circuit 17 and measurement circuit 18.Capacitive touch screen Can include a plurality of driving electrodes 151 and a plurality of detecting electrode 152, the driving electrodes 151 are handed over the detecting electrode 152 It is laminated on multiple overlapping places.

Frequency circuit 11 provides the frequency signal that whole system is provided according to working frequency, and pulse width modulation circuit 12 provide pulse width modulation signal according to frequency signal with pulse width modulation parameter, to drive driving electrodes 151.Driving is opened 131 drivings for controlling driving electrodes are closed, and is that at least one driving electrodes 151 are selected by selection circuit 141.Additionally, detecting Switch 132 controls the electrical couplings between driving electrodes and measurement circuit 18.When driving switch 131 is for conducting (on), detecting To disconnect (off), pulse width modulation signal is supplied to by driving selection circuit 141 switch 132 via driving selection circuit 141 The driving electrodes 151 of coupling, wherein driving electrodes 151 can be a plurality of, and selected driving electrodes 151 can be the drive One, two or a plurality of in moving electrode 151.When driving electrodes 151 are driven by pulse width modulation signal, electrode is detected The 152 overlapping places overlapped with powered driving electrodes 151 can produce capacitive couplings 152, and each detecting electrode 152 Input signal is provided when with 151 capacitive couplings of driving electrodes.Variable resistor 16 is to provide impedance, input according to resistance parameter Signal is to be supplied to detecting selection circuit 142 via variable resistor 16, and detecting selection circuit 142 is by a plurality of detecting electrode 152 Selection one, two, three, a plurality of or all detecting electrode 152 is coupled in amplifying circuit 17, input signal is via amplifying electricity Road 17 is according to being supplied to measurement circuit 18 after gain parameter.Measurement circuit 18 is according to pulse width modulation signal and frequency signal Detecting input signal, wherein measurement circuit 18 can be for detection signal is taken according to a phase parameter in an at least phase Sample, such as measurement circuit 18 can have an at least integrating circuit, and each integrating circuit is respectively according to phase parameter in extremely A few phase is integrated to the input signal in the input signal, to measure the size of input signal.In model of the invention In example, each integrating circuit can also be respectively according to phase parameter in an at least phase to a pair in the input signal The signal difference of input signal is integrated, or respectively according to phase parameter in an at least phase in the input signal The difference of two pairs of signal differences of input signal is integrated.Additionally, it is few analog-to-digital electricity that measurement circuit 18 can also be included (ADC) result that integrating circuit is detected is changed into data signal.In addition, this technology common skill of the neck with usual knowledge Art personnel are it can be deduced that foregoing input signal can be first passed through after amplifying circuit 17 amplifies again by detecting selection circuit 142 It is supplied to measurement circuit 18, the present invention not to be any limitation as.

In the present invention, capacitive touch screen has at least two drive patterns, be divided into most power saving single electrode drive pattern, Bipolar electrode drive pattern, and have at least one driving current potential.Each drive pattern has corresponding to different driving current potentials At least one working frequency, each working frequency one group of parameter of correspondence, and each drive pattern corresponds to different drives Electrokinetic potential represents different degrees of power consumption.

The electrode of capacitive touch screen can be divided into a plurality of driving electrodes 151 and a plurality of detecting electrode 152, described to drive electricity Pole 151 overlaps on multiple overlapping places (intersection) with the detecting electrode 152.Fig. 2A is referred to, is driven in single electrode In pattern, a driving electrodes 151 are once driven, that is, driving is provided in only one driving electrodes 151 of same time Signal S, when any bar driving electrodes 151 are driven, detects the signal of all detecting electrodes 152 to produce a dimension sense Measurement information.Accordingly, after all driving electrodes 151 are driven, can obtain corresponding to each dimension sense of driving electrodes 151 Measurement information, to constitute the complete image relative to all overlapping places.

Fig. 2 B and 2C are referred to, in bipolar electrode drive pattern, adjacent pair driving electrodes 151 is once driven.Change speech It, the driving electrodes 151 of n bars will drive n-1 times altogether, and a pair of driving electrodes 151 in office are when being driven, and detect all detectings The signal of electrode 152 is producing a dimension sensitive information.For example, such as Fig. 2 B first, while providing drive signal S to first To driving electrodes 151, if 5 it is necessary to drive 4 times.Next, as shown in Figure 2 C, while providing drive signal S to second To driving electrodes 151, by that analogy.Accordingly, after every a pair of driving electrodes 151 (common n-1 to) are driven, can be corresponded to The dimension sensitive information of every a pair of driving electrodes 151, image is inside contracted to constitute relative to foregoing complete image, inside contracts image Pixel quantity less than complete image pixel quantity.In another example of the present invention, bipolar electrode drive pattern is further included point It is other that both sides driving electrodes 151 are carried out with single electrode driving, and when either side list driving electrodes 151 are driven, detecting is all The signal of electrode 152 is detected to produce a dimension sensitive information, to be additionally provided two dimension sensitive informations, and is inside contracted Image composition extends out image.Dimension sensitive information for example corresponding to both sides is respectively placed in outside the both sides for inside contract image to constitute Extend out image.

The art has the ordinary person of usual knowledge it can be deduced that the present invention can more include three electrode drive moulds Formula, four electrode drive patterns etc., no longer describe herein.

Foregoing driving current potential can drive current potential, such as low-driving potential to be driven with high including but not limited at least two Current potential, the current potential that drives higher has signal to noise ratio higher.

According to foregoing, in single electrode drive pattern, a complete image can be obtained, and in bipolar electrode drive pattern, One can be obtained to inside contract image or one extend out image.Complete image, interior epitome or to extend out image can be in outside conductive object 19 Close to or obtain when touching before capacitive touch screen with capacitive touch screen, judge so as to producing the variable quantity of each pixel The position of external conductive object 19.Wherein, described external conductive object 19 can be one or more.Also it has been observed that outside Conductive object 19 close to or when touching capacitive touch screen, or with the driving electrodes 151 and the detecting capacitive character of electrode 152 Coupling, and noise jamming is caused, even if driving electrodes 151 are not driven, external conductive object 19 is likely to and the drive Moving electrode 151 and the detecting capacitive couplings of electrode 152.Additionally, noise is likely to be disturbed from other approach.

Accordingly, in one example of the present invention, when noise detection process is carried out, driving switch 131 disconnects, and detects Switch 132 is turned on, and the dimension that now measurement circuit can produce noise to detect according to the signal of the detecting electrode 152 is sensed Information, so as to judging noise jamming whether in accordance with permissible range.For example, it may be judging the dimension sensing letter of noise detecting Whether breath has any value more than a door limit value, or noise detecting dimension sensitive information all values totalling or average Whether whether noise jamming is judged in accordance with permissible range more than a door limit value.The art has the skill of general knowledge Art personnel can deduce that whether other judge noise jamming in accordance with permissible range by the dimension sensitive information that noise is detected Mode, the present invention do not described.

Noise detection process can be obtained foregoing complete image when system is activated or each time, inside contract image or outer Carried out when expanding image, or timing or carried out during through repeatedly obtaining foregoing complete image, inside contracting image or extending out image, or It is to have detected external conductive object to approach or carried out when touching, the technical staff that the art has general knowledge can push away Know that other are carried out the opportune moment of noise detection process, the present invention is not any limitation as.

It is to carry out frequency error factor when judging that noise jamming exceeds permissible range the present invention additionally provides sound interval sequence is changed.Amount Slowdown monitoring circuit is provided multigroup frequency setting, can be stored in internal memory or other store medias, to provide measurement circuit in changing Selected in sound interval sequence, and according to the frequency signal of the FREQUENCY CONTROL frequency circuit 11 selected.It can be in the frequency to change sound interval sequence Appropriate frequency setting is picked out in rate setting one by one, for example, select one of which frequency setting one by one and carry out noise detection process, Untill detecting noise jamming in accordance with permissible range.It can also be picked out one by one most in the frequency setting to change sound interval sequence Good frequency setting.For example selected one by one in the frequency setting and carry out noise detection process, detect wherein that noise jamming is most Small frequency setting, the maximum for such as detecting the dimension sensitive information of noise detecting is minimum frequency setting, or noise The minimum frequency setting of the totalling or average out to of all values of the dimension sensitive information of detecting.

Described frequency setting corresponds to including but not limited to drive pattern, frequency and parameter group.Parameter group can be bag Include but be not limited to the group selected from following collection：Foregoing resistance parameter, aforesaid gains parameter, Such phase parameter and aforementioned pulse Width modulation parameter, this technology those of ordinary skill of the neck with usual knowledge can deduce that other are applied to capacitive touch screen And its relevant parameter of control circuit.

The frequency setting can be as shown in following table 1, including it is multiple drive current potential, it is following with first drive current potential with As a example by second drives current potential, it can have more than three kinds of drive that there is the art the ordinary person of usual knowledge can deduce Electrokinetic potential.Each driving current potential can respectively have multiple drive modes, including but not limited to selected from the group of following collection：It is single Electrode drive pattern, bipolar electrode drive pattern, three electrode drive patterns, four electrode drive patterns etc..Each drives current potential Corresponding each drive pattern has multi-frequency respectively, and each frequency corresponds to a kind of foregoing parameter group.This technology There is the ordinary person of usual knowledge can deduce that each drives the frequency of corresponding each drive pattern of current potential can in field To be entirely different, or have part identical, the present invention is not any limitation as.Table 1

According to a kind of above-mentioned, method for detecting of detecting capacitance type touch-screen of present invention offer, Fig. 3 A are referred to.First as walked Shown in rapid 310, multiple frequency settings are sequentially stored according to power consumption size, each frequency setting is respectively corresponding to a kind of driving electricity A kind of drive pattern of position, and each frequency setting has frequency and parameter group, wherein driving current potential has at least one.Connect Get off, as shown at step 320, the setting of measurement circuit is initialized according to the parameter group of one of the frequency setting, and as walked Shown in rapid 330, the signal from the detecting electrode is detected with measurement circuit according to the parameter group of measurement circuit, and foundation comes from The signal of the detecting electrode produces a dimension sensitive information.Next, as indicated in step 340, according to described one-dimensional Whether degree sensitive information judges the interference of noise beyond permissible range.Then, as shown in step 350, in the interference of the noise During more than the permissible range, sequentially the frequency of one of frequency setting described in changes the work frequently respectively with parameter group The dimension sensitive information is produced after rate and the setting of the measurement circuit, and is judged according to the dimension sensitive information Whether the interference of the noise exceeds the permissible range, until the interference of the noise is not less than Cheng Suoshu permissible ranges. Can be shown in such as the step of Fig. 3 B 360, when the interference of the noise exceedes the permissible range, according to each frequency setting Frequency and parameter group change the working frequency and the setting of the measurement circuit respectively after produce the dimension sensing letter Breath, and the interference of the noise is judged according to the dimension sensitive information, and with by the minimum frequency of the noise jamming The frequency of rate setting changes the setting of the working frequency and the measurement circuit with parameter group respectively.

For example shown in Fig. 4, be according to a kind of arrangement for detecting of detecting capacitance type touch-screen of the invention, including：Storage electricity Road 43, drive circuit 41, circuit for detecting 42.As shown in abovementioned steps 310, storage circuit 43 includes multiple frequency settings 44, point Not sequentially stored according to power consumption size.Storage circuit 43 can be with circuit, internal memory or any storage matchmaker that can store electromagnetic recording Body.In example of the invention, frequency setting 44 can be constituted in the way of tabling look-up, in addition, frequency setting 44 can also be stored up Deposit power consumption parameter.

Drive circuit 41 can be the integrated of multiple circuits, including but not limited to foregoing frequency circuit 11, pulse width Modulation circuit 12, driving switch 131, detection switch 132 and driving selection circuit 141.Institute's column circuits are convenient in this example Present invention explanation, drive circuit 41 can only include partial circuit or add more circuits, and the present invention is not any limitation as.It is described Drive circuit is for providing at least driving electrodes 151 of the drive signal to capacitive touch screen according to working frequency, wherein electricity Appearance formula touch-screen includes a plurality of driving electrodes 151 with a plurality of detecting electrode 152, the driving electrodes 151 and the detecting electrode 152 overlap on multiple overlapping places.

Circuit for detecting 42 can be the integrated of multiple circuits, including but not limited to foregoing measurement circuit 18, amplifying circuit 17, Detecting selection circuit 142, it might even be possible to be that include can power transformation group 16.Institute's column circuits are convenient present invention explanations in this example, Circuit for detecting 42 can only include partial circuit or add more circuits, and the present invention is not any limitation as.Additionally, circuit for detecting 42 Execution abovementioned steps 320 to step 340 are further included, and performs step 350 or step 360.In the example of Fig. 3 B, the frequency Rate setting can sequentially be stored not based on power consumption size.

As discussed previously, whether the interference for judging the noise exceeds the dimension sensing of the permissible range Information is produced when the drive signal is not provided to the driving electrodes.For example, being to drive selection circuit 131 to disconnect And when detecting selection circuit 132 for conducting.

In one example of the present invention, current potential is at least driven there are multiple drive modes, the drive pattern includes single electrode Drive pattern and bipolar electrode drive pattern, wherein drive signal only provides the drive with the time described in single electrode drive pattern One of moving electrode, and in bipolar electrode drive pattern, the drive signal only provides a pair of the driving electrodes with the time. Power consumption size of the power consumption size of wherein described single electrode drive pattern less than the bipolar electrode drive pattern.Additionally, described In single electrode drive-type, the circuit for detecting be produced respectively when each driving electrodes are provided drive signal it is described one-dimensional Degree sensitive information, to constitute complete image, and wherein in the bipolar electrode drive-type, the circuit for detecting is at every a pair Driving electrodes produce the dimension sensitive information respectively when being provided drive signal, image is inside contracted to constitute, wherein in described Pixel of the pixel of epitome picture less than the complete image.Additionally, circuit for detecting can be further included point in bipolar electrode drive pattern It is other that two lateral electrodes are driven, and when the single driving electrodes of either side are driven, detect the letter of all detecting electrodes Number to produce the dimension sensitive information respectively, wherein respectively two lateral electrodes are driven with two produced dimension senses Measurement information is placed in described inside contracting and extend out image with composition outside the both sides of image, and the pixel for extending out image is more than described The pixel of complete image.

In another example of the present invention, the driving current potential includes that first drives current potential and second to drive current potential, wherein Corresponding to the power consumption size of the described first single electrode drive pattern generation complete image for driving current potential>Corresponding to institute The power consumption size of image is inside contracted described in the bipolar electrode drive pattern generation for stating the first driving current potential>Driven corresponding to described second The single electrode drive pattern of electrokinetic potential produces the power consumption size of the complete image.

In another example of the present invention, the driving current potential includes that first drives current potential and second to drive current potential, wherein Corresponding to the power consumption size of the described first single electrode drive pattern generation complete image for driving current potential>Corresponding to institute The single electrode drive pattern for stating the second driving current potential produces the power consumption size of the complete image.

Additionally, in one example of the present invention, the signal of each detecting electrode is to first pass through variable resistor respectively to carry again The circuit for detecting is supplied, the circuit for detecting is to set the variable resistor according to the parameter group of one of the frequency setting Impedance.In addition, the signal of the detecting electrode is to first pass through after an at least amplifying circuit amplifies signal to be just detected, the detecting Circuit is the gain that the amplifying circuit is set according to the parameter group of one of the frequency setting.Furthermore, the drive signal is Produced according to the parameter group of one of the frequency setting.

In one example of the present invention, each value of the dimension sensitive information is cycle foundation institute respectively to set State the signal of detecting electrode to produce, wherein the cycle of the setting is set according to the parameter group of one of the frequency setting It is fixed.In another example of the present invention, each value of the dimension sensitive information be respectively with the phase that at least sets according to Produced according to the signal of the detecting electrode, wherein the phase of the setting is come according to the parameter group of one of the frequency setting Setting.

Additionally, foregoing drive circuit 41, circuit for detecting 42 can be controlled by control circuit 45 with storage circuit 43.Control Circuit processed 45 can be can Programming processor, or other control circuits, the present invention is not intended to limit.

Fig. 5 is referred to, is the schematic diagram according to single electrode drive pattern of the invention.Drive signal S is sequentially provided to One driving electrodes, Article 2 driving electrodes ..., to the last driving electrodes, and driven in each driving electrodes The dimension sensitive information 52 that dynamic signal S produces single electrode to drive when driving.Each driving electrodes of set are produced when being driven The dimension sensitive information 52 that drives of single electrode, may make up complete image 51, each value of complete image 51 is corresponding respectively The capacitively coupled change of one of the electrode confluce.

Additionally, each value of complete image is respectively corresponding to the position at one of the overlapping place.For example, each driving The middle position of electrode is respectively corresponding to first dimension coordinate, and the center of each article of detecting electrode is respectively corresponding to the Two dimension coordinates.First dimension coordinate can be that laterally (or level, X-axis) coordinate is sat with longitudinal direction (or vertical, Y-axis) One of mark, and second dimension coordinate can be laterally (or level, X-axis) coordinate and longitudinally (or vertical, Y-axis) coordinate it It is another.Each overlapping place is respectively corresponding to overlap on a two-dimensionses coordinate of the driving electrodes with detecting electrode at overlapping place, two Latitude coordinates are made up of with second dimension coordinate first dimension coordinate, such as (first dimension coordinate, second Dimension coordinate) or (second dimension coordinate, first dimension coordinate).In other words, what each single electrode drove is one-dimensional Degree sensitive information is respectively corresponding to first dimension coordinate in one of described driving electrodes center, wherein the one of single electrode driving Each value (or each value of complete image) of dimension sensitive information is respectively corresponding to one of described driving electrodes center The two-dimensionses coordinate of first dimension coordinate, the second dimension coordinate composition central with one of the detecting electrode.Together Reason, each value of complete image is respectively corresponding to the middle position at one of the overlapping place, that is, be respectively corresponding to the driving First dimension coordinate in one of electrode center, the second dimension coordinate composition central with one of the detecting electrode Two-dimensionses coordinate.

Fig. 6 is referred to, is the schematic diagram according to bipolar electrode drive pattern of the invention.Drive signal S is sequentially provided to A pair of driving electrodes, second pair of driving electrodes ..., to the last a pair of driving electrodes, and driven in every a pair of driving electrodes The dimension sensitive information 62 that dynamic signal S produces bipolar electrode to drive when driving.In other words, N bars driving electrodes may make up N-1 pairs (multipair) driving electrodes.Gather the dimension sensitive information 62 that the bipolar electrode produced when every a pair of driving electrodes are driven drives, May make up and inside contract image 61.Inside contract the number of the quantity less than the value (or pixel) of complete image 51 of the value (or pixel) of image 61 Amount.Relative to complete image, the dimension sensitive information for inside contracting each bipolar electrode driving of image is respectively corresponding to a pair of drives First dimension coordinate of middle position between moving electrode, and during each value is respectively corresponding between foregoing a pair of driving electrodes Entreat the two-dimensionses of first dimension coordinate of position, the second dimension coordinate composition central with one of the detecting electrode Coordinate.In other words, each value for inside contracting image is respectively corresponding to the position in center between a pair overlapping places, that is, be respectively corresponding to one To first dimension coordinate and the detecting electrode of middle position between driving electrodes one of (or the multipair driving electrodes) One of center second dimension coordinate constitute two-dimensionses coordinate.

Fig. 7 A are referred to, is that the schematic diagram that the first side single electrode drives is carried out in bipolar electrode drive pattern under this invention. Drive signal S is provided to the driving electrodes closest to the side of capacitive touch screen first, and closest to capacitive touch screen The first side dimension sensitive information 721 that single electrode drives is produced when the driving electrodes of the first side are driven by drive signal S.Again please It is to carry out the schematic diagram that the second side single electrode drives in bipolar electrode drive pattern under this invention refering to Fig. 7 B.Drive signal S quilts The driving electrodes closest to the side of capacitive touch screen second are supplied to, and in the driving closest to the side of capacitive touch screen second The second side dimension sensitive information 722 that single electrode drives is produced when electrode is driven by drive signal S.First side and the second side The dimension sensitive information 721 and 722 that the single electrode that driving electrodes are produced when being driven drives is respectively disposed in and inside contracts image 61 The first side and the second side outer image 71 is extended out with composition.The quantity for extending out the value (or pixel) of image 71 is more than complete image 51 Value (or pixel) quantity.It is the first side dimension sensing letter for first producing single electrode to drive in one example of the present invention Breath 721, then produce and inside contract image 61, then the second side dimension sensitive information 722 for producing that single electrode drives, shadow is extended out to constitute As 71.It is first to produce to inside contract image 61 in another example of the present invention, then produces the first side that single electrode drives and the respectively Two side dimension sensitive informations 721 and 722, image 71 is extended out to constitute.

In other words, extend out image be sequentially driven by single electrode the first side dimension sensitive information, inside contract image and list Second side dimension sensitive information of electrode drive is constituted.It is because the value for inside contracting image 61 is that bipolar electrode drives therefore average big The first side and the mean size of the value of the second side dimension image that small meeting drives more than single electrode.In example of the invention, First side is just to be respectively placed in inside contract image 61 after scaling with the value of the second side dimension sensitive information 721 and 722 The first side and the second side outside.The ratio can be preset multiple, and this preset multiple is more than 1, or according to bipolar electrode Ratio between the value of the dimension sensitive information that the value and single electrode of the dimension sensitive information of driving drive is produced.E.g. All values summation (or average) and the dimension for inside contracting adjacent first side in image of the dimension sensitive information 721 of side sense letter Cease the ratio of 62 all values summations (or average), the value of the first side dimension sensitive information 721 be after this is scaling It is placed in outside the first side for inside contracting image 61.Similarly, be the second side dimension sensitive information 722 all values summation (or average) With the ratio of all values summation of dimension sensitive information 62 (or average) for inside contracting adjacent second side in image, the second side dimension sense The value of measurement information 722 is just placed in outside the second side for inside contracting image 61 after this is scaling.Again for example, foregoing ratio can Being the dimension sensitive information 721 and 722 for inside contracting all values summation (or average) of image 61 and the first side and the second side The ratio of all values summation (or average).

In single electrode drive pattern, each value (or pixel) of complete image is stacked the two-dimensionses position at place (or coordinate), is by the corresponding first dimension position (or coordinate) of the driving electrodes for being mutually laminated on being stacked and detecting electrode phase The second dimension position (or coordinate) answered is constituted, such as (first dimension position, second dimension position) or (the Two dimension positions, first dimension position).Single external conductive object may be with one or more overlapping place's capacitive characters Coupling, overlapping place capacitively coupled with external conductive object can produce capacitively coupled change, react in complete image In corresponding value, that is, react in outside conductive object corresponds to complete image in corresponding value.Therefore according to external conductive pair As corresponding to corresponding value in complete image and two-dimensionses coordinate, the centroid position (two-dimensionses of external conductive object can be calculated Coordinate).

According to example of the invention, in single electrode drive pattern, each electrode (driving electrodes and detecting electrode) phase The dimension position answered is the position in electrode center.According to another example of the present invention, in bipolar electrode drive pattern, every a pair Electrode (driving electrodes and detecting electrode) corresponding dimension position is central position between two electrodes.

In image is inside contracted, first dimension sensitive information corresponding to first pair of middle position of driving electrodes, i.e., the First dimension position in center between one and Article 2 driving electrodes (first pair of driving electrodes).If merely calculating Centroid position, then can only calculate first pair of driving electrodes center and last position to driving electrodes between central, in The scope of the position that epitome picture is calculated lack the first pair of driving electrodes middle position first dimension position of center () with Scope between first driving electrodes middle position and last in driving electrodes middle position and the last item driving electrodes Scope between the position of centre.

Relative to image is inside contracted, extend out in image, the first side is respectively corresponding to first with the second side dimension sensitive information The bar position central with the last item driving electrodes, therefore foundation extends out the scope ratio of the position that image is calculated according to interior epitome As the scope of position for calculating increased first pair of driving electrodes middle position (first dimension position in center) and the Scope between one driving electrodes middle position and last to driving electrodes middle position and the last item driving electrodes center Scope between position.In other words, include what is calculated according to complete image according to the scope for extending out the position that image is calculated The scope of position.

Similarly, foregoing bipolar electrode drive pattern can more expand as multi-electrode drive pattern, that is, drive simultaneously A plurality of driving electrodes.In other words, drive signal is a plurality of (all) driving electrodes while in being supplied to one group of driving electrodes, example Driving electrodes quantity such as one group of driving electrodes has two, three or four.Described multi-electrode drive pattern includes foregoing Bipolar electrode drive pattern, not including foregoing single electrode drive pattern.

Fig. 8 is referred to, is according to a kind of method for detecting of detecting capacitance type touch-screen of the invention.As shown in step 810, The capacitive touch screen with a plurality of driving electrodes sequentially arranged in parallel with a plurality of detecting electrode is provided, wherein described drive electricity Pole is with the detecting electrode crossover in the overlapping place of multiple.Example driving electrodes 151 as the aforementioned and detecting electrode 152.Next, such as Shown in step 820, respectively single electrode drive pattern and multi-electrode drive pattern provide drive signal to the driving electrodes it One with one of driving electrodes group driving electrodes.It is, the drive signal is only to provide every time in monopole drive pattern To one of described driving electrodes, and the drive signal is every time while being provided the driving electricity in multi-electrode drive pattern One group of driving electrodes of pole, wherein in addition to last N bars driving electrodes, each driving electrodes with rear two adjacent driving electrodes Composition powered one group of driving electrodes simultaneously, and N is that the driving electrodes quantity of one group of driving electrodes subtracts one.Drive signal Offer can be provided by foregoing drive circuit 41.Next, as shown in step 830, in each drive signal quilt During offer, dimension sensitive information is obtained by the detecting electrode, driven with obtaining multiple multi-electrodes in multi-electrode drive pattern Dimension sensitive information and obtain the first side in single electrode drive pattern and sense letter with the dimension that the second side single electrode drives Breath.For example, in multi-electrode drive pattern, obtaining multi-electrode driving respectively when each group of driving electrodes are provided drive signal Dimension sensitive information.Again for example, in single electrode drive pattern, in first driving electrodes and the last item driving electrodes The dimension sensitive information and the second side single electrode of the first side single electrode driving drive one is obtained when drive signal is provided respectively Dimension sensitive information.The acquirement of dimension sensitive information can be obtained by above-mentioned circuit for detecting 42.Described dimension sense Measurement information includes that the dimension sensitive information (inside contracting image) of multi-electrode driving and the first side drive with the second side single electrode Dimension sensitive information.Next, as illustrated in step 840, the dimension sensing for sequentially being driven according to the first side single electrode The dimension sensitive information that the dimension sensitive information and the second side single electrode that information, all of multi-electrode drive drive produces shadow As (extending out image).Step 840 can be completed by aforementioned control circuit.

As it was earlier mentioned, in single electrode drive pattern the current potential of drive signal with multi-electrode drive pattern drive signal Current potential be not necessarily intended to identical, can be identical, or difference.It is with the first larger alternating current that for example single electrode drives Position drives, and relative to the second ac potential that multi-electrode drives, the ratio of the first ac potential and the second ac potential is pre- If ratio.In addition, all values that step 840 is the dimension sensitive information driven with the second side single electrode according to the first side are point Identical or different pre-set ratio is not multiplied by produce the image.Additionally, in single electrode drive pattern drive signal frequency Rate is different from the frequency of the drive signal in multi-electrode drive pattern.

The driving electrodes quantity of one group of driving electrodes can have two, three, and even more many, the present invention is not limited System.In better model of the invention, one group of driving electrodes quantity of driving electrodes is two.In one group of driving of driving electrodes When number of electrodes is two, each driving electrodes are respectively corresponding to the first latitude coordinates, many (double) electrode drives of each of which Dimension sensitive information is respectively corresponding to first dimension coordinate in center between a pair of driving electrodes of the driving electrodes, and And first the dimension sensitive information that is driven with the second side single electrode of side be respectively corresponding to first with the last item driving electrodes First dimension coordinate.

Similarly, when one group of driving electrodes quantity of driving electrodes is a plurality of (more than two), each driving electrodes difference Corresponding to the first latitude coordinates, the dimension sensitive information that each of which multi-electrode drives is respectively corresponding to the driving electrodes First dimension coordinate central between two driving electrodes of lie farthest away in one group of driving electrodes, and the first side and second The dimension sensitive information that side single electrode drives is respectively corresponding to first dimension of first and the last item driving electrodes Coordinate.

Additionally, each detecting electrode is respectively corresponding to second dimension coordinate, and each dimension sensitive information Each value be respectively corresponding to second dimension coordinate of detecting one of the electrode.

Fig. 9 A and Fig. 9 B are referred to, is the signal that detecting conductive bar receives capacitive couplings signal via driving conductive bar Figure.Because signal passes through some load circuits, such as by capacitive couplings, detect the signal that receives of conductive bar and be supplied to driving Signal before conductive bar can produce phase difference.For example, when drive signal is supplied to first driving conductive bar, first detecting is led The signal that electric bar is received can produce the poor ψ 1 of first phase with the signal before driving conductive bar is supplied to, and as shown in Figure 9 A, and drive When signal is supplied to Article 2 to drive conductive bar, first detecting the conductive bar signal received and the letter being supplied to before driving conductive bar Number second phase difference ψ 2 can be produced, as shown in Figure 9 B.

Resistor capacitor circuit (the RC that first phase difference ψ 1 and second phase difference ψ 2 can pass through with drive signal Circuit) different and difference.When the cycle of drive signal is all identical, different phase differences represents that signal delay is different Time be received, if ignoring the foregoing direct detection signal of phase difference, the beginning phase of measuring signal can be caused different and Produce Different Results.For example, it is assumed that when phase difference is 0, and signal is string ripple, and amplitude is A.When phase be 30 degree, 90 Degree, 150 degree, 210 degree, 270 degree and during 330 degree of detection signals, can respectively obtain | 1/2A |, | A |, | 1/2A |, | -1/2A |, |-A | the signal with | -1/2A |.But when phase difference is 150 degree, the phase for starting to measure causes a deviation, so that becoming in phase During for 180 degree, 240 degree, 300 degree, 360 degree, 420 degree with 480 degree of detection signals, 0 can be respectively obtained,0、WithSignal.

In by previous example, it can be seen that the delay of the start-phase of the measurement caused by Such phase differences, letter can be caused Number result for measuring is entirely different, and no matter drive signal is string ripple or square wave (such as PWM), all can be with the presence of similar difference.

Additionally, when drive signal is provided every time, adjacent a plurality of driving conductive bar can be available to, wherein driving is led Electric bar is sequentially arranged in parallel.Two adjacent driving conductive bars are available in the preferable example invented, therefore one In secondary scanning, n bars drive conductive bar to be provided n-1 drive signal altogether, and one group of driving conductive bar is supplied to every time, for example, the Once it is supplied to first to drive conductive bar with Article 2, is supplied to Article 2 to drive conductive bar with Article 3 for the second time, according to this Analogize.As it was earlier mentioned, drive signal when being provided every time, one group of driving conductive bar being provided can be one, two or More a plurality of, the present invention is not intended to limit the quantity of the driving conductive bar that each drive signal is provided.When each drive signal is provided, The signal that all detecting conductive bars are measured can assemble a dimension sensitive information, all dimensions in set single pass Sensitive information may make up a two-dimensionses sensitive information, can be considered image.

Accordingly, in the first embodiment of optimal mode of the present invention, it is directed to different conductive bars using different phase differences To postpone detection signal.For example, multiple phase differences are first determined, respectively when each group of driving conductive bar is provided drive signal, Carry out measurement signal according to each phase difference, the phase difference of the maximum institute foundation is that most convergence is supplied to drive in the signal for measuring Signal before moving conductive bar and detecting conductive bar receive after signal between phase difference, most convergence phase is referred to as in the following description Difference.The measurement of signal can select one of described detecting conductive bar to be measured according to each phase difference, or select many Bar or whole detect conductive bar to be measured according to each aberration, according to a plurality of or all detecting conductive bars signal summations To judge most convergence phase difference.According to above-mentioned, it can be determined that go out each group of most convergence phase difference of conductive bar, in other words, When each group of conductive bar is provided drive signal, after all detecting conductive bars postpone to be provided the most convergence phase difference of drive signal Just measured.

Can be in (multiple) phase difference in addition it is also possible to be that need not carry out measurement signal according to all aberrations Sequentially carry out measurement signal according to a phase difference, stop when successively decreasing after the signal for finding to measure is incremented by, wherein measurement is arrived Signal in the phase difference of the maximum institute foundation be most convergence phase difference.In this way, the larger image of signal can be obtained.

Alternatively, it is also possible to be first to select drive conductive bar one group as benchmark conductive bar, other conductive bars are referred to as Non-referenced conductive bar, first detects the most convergence phase difference of benchmark conductive bar, as flat standard (level) phase difference, then detects non-base Standard drives conductive bar most convergence to put down the phase difference of quasi- phase difference, referred to as most flat quasi- phase difference.For example, with benchmark conductive bar The signal that flat quasi- phase difference is measured enters as flat calibration signal, each phase difference for driving conductive bar to each group of non-referenced respectively The measurement of row signal, phase difference using in the signal for measuring closest to flat calibration signal person institute foundation is used as being provided drive signal Driving conductive bar flat quasi- phase difference.In this way, each group of flat quasi- phase difference of driving conductive bar is can determine whether out, according to each group Drive the flat quasi- phase difference of conductive bar come the measurement of signal after postponing, can obtain and relatively put down accurate image, i.e., between the signal in image Difference very little.In addition, flat calibration signal can fall within default working range, not necessarily needing to be most preferably can peak signal.

It is to use same phase poor with all detecting conductive bars when each drive signal is provided in preceding description, this Technical field has the technical staff of usual knowledge it can be deduced that can also be each group when each drive signal is provided Detecting conductive bar uses and respective most convergence phase difference or flat quasi- phase difference is respectively adopted.In other words, it is in each drive signal When being provided, each phase difference to each group of detecting conductive bar carries out the measurement of signal respectively, to judge most convergence phase Difference puts down quasi- phase difference.

In fact, except larger or in addition to relatively putting down accurate image, or with or not to obtain come delayed measurement using aberration Enlargement ratio together, impedance, measurement time obtain relatively puts down accurate image.

Accordingly, the present invention proposes the measuring signal method of touch-screen, as shown in Figure 10.As shown in step 1010, there is provided touch Screen is touched, touch-screen includes a plurality of the leading of a plurality of driving conductive bar arranged in parallel and a plurality of detecting conductive bar composition arranged in parallel Electric bar, described driving conductive bar overlaps on multiple crossover regions with described detecting conductive bar.Additionally, as shown in step 1020, Determine each or each group delay phase difference of driving conductive bar.Afterwards, as shown in step 1030, it is sequentially provided drive signal To described one or one group driven in conductive bar, driving conductive bar and the described detecting conductive bar of drive signal are provided Produce mutual capacitive couplings.Next, as shown in step 1040, when each drive signal is provided, being provided drive signal The signal of each detecting combination be just to be measured after postponing corresponding phase difference.

Accordingly, in the measuring signal device of inventive touch screen, foregoing step 1030 can be by foregoing driving Circuit 41 is implemented.Additionally, step 1040 can be implemented by foregoing circuit for detecting 42.

In example of the invention, the delay phase difference of each or each group driving conductive bar is by multiple predetermined phases Selected in difference, such as select foregoing most convergence phase difference.Each group of conductive bar is referred in a plurality of driving while being provided drive One group of a plurality of conductive bar of dynamic signal, for example, implemented by the driving selection circuit 141 of foregoing drive circuit 41.For example, according to Sequence selects one of described drivings conductive bar or one group of conductive bar as conductive bar is selected, such as by the reality of drive circuit 41 Apply.Next, by picking out the delay phase difference for being selected conductive bar in multiple predetermined phases difference.Wherein, in drive signal quilt It is supplied to when being selected conductive bar, after postponing the described signal for postponing to be measured after phase difference more than other predetermined phases difference is postponed The signal for detecting.For example, being to be implemented by foregoing circuit for detecting 42, the delay phase difference for detecting can be stored in storage Circuit 43.

Additionally, may also be selecting foregoing flat quasi- phase difference.For example, selecting or a group of described driving conductive bar Conductive bar as benchmark conductive bar, other or other group conductive bar as non-referenced conductive bar, such as by the reality of drive circuit 41 Apply.Afterwards, by picking out the delay phase difference of benchmark conductive bar in multiple predetermined phases difference, wherein being provided in drive signal During benchmark conductive bar, postpone the signal detected after described delays phase difference more than postponing what is detected after other predetermined phases are poor Signal.Wherein, the delay phase difference of benchmark conductive bar is foregoing flat quasi- phase difference.Next, postponing institute with benchmark conductive bar The signal for postponing to be detected after phase difference stated is used as reference signal, then sequentially select described non-referenced conductive bar one or one Group non-referenced conductive bar as being selected conductive bar, and by picking out the delay for being selected conductive bar in multiple predetermined phases difference Phase difference, most flat quasi- phase difference as the aforementioned, wherein when drive signal is provided to and is selected conductive bar, postponing described prolonging The signal detected after slow phase difference is compared to the signal for postponing to be detected after other predetermined phases are poor closest to reference signal.With On, can be implemented by circuit for detecting 42.

In example of the invention, when drive signal is provided to benchmark conductive bar or is or become heir to the conductive bar of choosing, by described Detecting conductive bar in the signal of a plurality of measurement be the signal measured by one of described detecting conductive bar.In other words, be according to Delay phase difference is picked out according to the signal of phase same detecting conductive bar.In another example of the present invention, drive signal quilt When being supplied to benchmark conductive bar or being or become heir to the conductive bar of choosing, the signal by a plurality of measurement in described detecting conductive bar is by institute The summation of the signal that at least two detecting conductive bars of the detecting conductive bar stated are measured.In other words, it is to be detectd according to identical is a plurality of The summation for surveying the signal of the detecting conductive bar of conductive bar or whole picks out delay phase difference.

As it was earlier mentioned, can be each or each group by overlapping with each detecting conductive bar on driving conductive bar Crossover region has corresponding delay phase difference.In the following description, it is with each or each group of driving conductive bar and hands over respectively Fold each or each group of detecting conductive bar is combined as detecting.In other words, drive signal can be and meanwhile be supplied to one or A plurality of driving conductive bar, and signal can also be measured by one or more detecting conductive bar.When producing signal through measuring, drive The one or more driving conductive bar that dynamic signal is provided is referred to as detecting and combines with one or more detecting conductive bar being measured. For example in wall scroll driving or a plurality of driving, with a conductive bar detection signal value, or with two conductive bars measurement differences, and or It is to measure a pair of difference with three conductive bars.Wherein difference is two adjacent differences of the signal of conductive bar, and double difference value is In three adjacent conductive bars, the difference of the signal of preceding two conductive bars subtracts each other the differences that the difference of rear two signals of conductive bar is produced.

Accordingly, it is a kind of measuring signal method of touch-screen, as shown in figure 11 in another example of the present invention.As walked Shown in rapid 1110, there is provided touch-screen, touch-screen includes a plurality of driving conductive bar arranged in parallel and a plurality of detecting arranged in parallel The a plurality of conductive bar of conductive bar composition, described driving conductive bar overlaps on multiple crossover regions with described detecting conductive bar.This Outward, as seen at step 1120, each is overlapped with each or each group of driving conductive bar and respectively or each group of detecting is conductive Bar is combined as detecting, and as shown in step 1130, determines the delay phase difference of each detecting combination.Afterwards, such as step Shown in 1140, drive signal to described or a group driven in conductive bar is sequentially provided, is provided detecing for drive signal Survey the driving conductive bar and overlapping detecting conductive bar generation mutual capacitive couplings that drive signal is provided in combination.Next, As indicated in step 1150, when each drive signal is provided, the signal for being provided each detecting combination of drive signal is to prolong Just it is measured after slow corresponding phase difference.

Accordingly, in a kind of measuring signal device of the invention, step 1140 can be by foregoing drive circuit 41 Implement, and step 1150 can be implemented by foregoing circuit for detecting 42.

In an example of the invention, step 1130 can be included：One of described detecting combination is sequentially selected as quilt Detecting combination is selected, can be implemented by foregoing drive circuit 41；And chosen by being picked out in multiple predetermined phases difference The delay phase difference of choosing detecting combination, wherein when drive signal is provided to and is selected detecting combination, postponing described delay The signal measured after phase difference, more than the signal for postponing to be detected after other predetermined phases difference, can be by foregoing circuit for detecting 42 implement.

In another example of the present invention, determine that the delay phase difference of each detecting combination can also be real as described below Apply.Select one of described detecting combination and detect combination as benchmark, other detecting combinations are detected as non-referenced and combined, and One of described non-referenced detecting combination is sequentially selected as detecting combination is selected, can be real by foregoing drive circuit 41 Apply.Additionally, the delay phase difference by picking out benchmark detecting combination in multiple predetermined phases difference, wherein being provided in drive signal When detecting combination to benchmark, the described signal for postponing to be detected after phase difference of delay is detected after being more than delay other predetermined phases difference The signal for arriving, and the signal for postponing to be detected after phase difference described in benchmark detecting combinatorial delays is used as reference signal.In addition, By picking out the delay phase difference for being selected detecting combination in multiple predetermined phases difference, wherein be provided in drive signal being chosen During choosing detecting combination, postpone to be detected after the signal detected after described delays phase difference is poor compared to delay other predetermined phases Signal closest to reference signal.More than, can be implemented by foregoing circuit for detecting 42.

In the second embodiment of the present invention, signal is measured by control circuit, and the signal of each group of detecting conductive bar is Respectively through being measured again after variable resistor, control circuit is the resistance that variable resistor is determined according to each group of driving conductive bar It is anti-.For example, first selecting one group of the driving conductive bar as benchmark conductive bar, other conductive bars are referred to as non-referenced conductive bar. Multiple default impedances are set first, and detect one when benchmark conductive bar (being probably one or more) is provided drive signal Bar detects the signal of conductive bar, or detecting is a plurality of or all detects the totalling of the signals of conductive bars, used as flat calibration signal.In addition, Flat calibration signal can fall within default working range, not necessarily need to be optimal or peak signal.In other words, it is any to make flat standard The default impedance that signal falls within default working range can serve as the flat quasi- impedance of benchmark conductive bar.Next it is non-at each group When benchmark conductive bar is provided drive signal value, respectively according to each default impedance adjustment variable resistor, and this is detected The signal of conductive bar is detected, or detects the totalling of a plurality of or all detecting conductive bars the signal, to compare closest to flat standard The default impedance of signal, as the flat quasi- impedance relative to this group of non-referenced conductive bar for being provided drive signal.In this way, can sentence Break and each group of flat quasi- impedance of driving conductive bar, variable resistor is adjusted according to each group of flat quasi- impedance of driving conductive bar Impedance (adjustment variable resistor to flat quasi- impedance), can obtain and relatively put down accurate image, i.e. difference very little between the signal in image.

It is to put down quasi- impedance using identical with all detecting conductive bars when each drive signal is provided in preceding description, The art there is the technical staff of usual knowledge it can be deduced that can also be when each drive signal is provided, it is each Group detecting conductive bar uses and respective flat quasi- impedance is respectively adopted.In other words, be when each drive signal is provided, it is right respectively The each default impedance of each group of detecting conductive bar carries out the measurement of signal, is hindered with the prediction for judging the flat calibration signal of most convergence It is anti-, obtain each group of driving conductive bar respectively accordingly and be provided each flat quasi- impedance of detecting conductive bar during drive signal, with Each impedance of the variable resistor of detecting conductive bar of electrical couplings is adjusted respectively.

Foregoing control circuit may also be by one or many IC to constitute in addition to it can be made up of electronic component. In one example of the present invention, variable resistor can be built into IC, can by programmable program (firmware in such as IC, Firmware) impedance of variable resistor is controlled.Such as variable resistor is made up of multiple resistance, and by multiple switch control System, opening and closing (on and off) and adjust the impedance of variable resistor by different switches, due to variable resistor with it is programmable Program is known technology, is no longer described herein.Variable resistor in IC by it is programmable it is program control can be via a piece of wood serving as a brake to halt a carriage body amendment in the way of Suitable for the contact panel of different qualities, cost can be effectively reduced, reach the purpose of commercial production.

In the third embodiment of the present invention, signal is measured by control circuit, and the signal of each group of detecting conductive bar is Measured respectively through circuit for detecting (such as integrator), control circuit is to determine detecting electricity according to each group of driving conductive bar The enlargement ratio on road.For example, first selecting one group of the driving conductive bar as benchmark conductive bar, other conductive bars are referred to as non-base Quasi- conductive bar.Multiple default enlargement ratios are set first, and are provided drive in benchmark conductive bar (being probably one or more) A signal for detecting conductive bar is detected during dynamic signal, or detecting is a plurality of or all detects the totalling of the signals of conductive bars, as Flat calibration signal.In addition, flat calibration signal can fall within default working range, optimal or peak signal is not necessarily needed to be.Change speech It, the flat standard that any default enlargement ratio for making flat calibration signal fall within default working range can serve as benchmark conductive bar is put Big multiplying power.Next when each group of non-referenced conductive bar is provided drive signal value, respectively according to each default times magnification Rate adjusts circuit for detecting, and detects the signal of this detecting conductive bar, or detects a plurality of or all detecting conductive bars the letter Number totalling, to compare the default enlargement ratio closest to flat calibration signal, as relative to the group for being provided drive signal The flat quasi- enlargement ratio of non-referenced conductive bar.In this way, each group of flat quasi- enlargement ratio of driving conductive bar is can determine whether out, according to every One group of flat quasi- enlargement ratio of driving conductive bar adjusts the enlargement ratio of circuit for detecting, can obtain and relatively puts down accurate image, i.e. shadow The difference very little between signal as in.

It is using identical flat quasi- amplification with all detecting conductive bars when each drive signal is provided in preceding description Multiplying power, the art there is the technical staff of usual knowledge it can be deduced that can also be when each drive signal is provided, Each group of detecting conductive bar uses and respective flat quasi- enlargement ratio is respectively adopted.In other words, it is to be provided in each drive signal When, each default enlargement ratio to each group of detecting conductive bar carries out the measurement of signal respectively, to judge the flat standard of most convergence The scale-up multiplying power of signal, obtains each group of driving conductive bar and is provided each detecting conduction during drive signal respectively accordingly The flat quasi- enlargement ratio of bar.

In the fourth embodiment of the present invention, signal is measured by control circuit, and the signal of each group of detecting conductive bar is Measured respectively through circuit for detecting (such as integrator), control circuit is to determine detecting electricity according to each group of driving conductive bar The measurement time on road.For example, first selecting one group of the driving conductive bar as benchmark conductive bar, other conductive bars are referred to as non-base Quasi- conductive bar.Multiple default measurement times are set first, and are provided drive in benchmark conductive bar (being probably one or more) A signal for detecting conductive bar is detected during dynamic signal, or detecting is a plurality of or all detects the totalling of the signals of conductive bars, as Flat calibration signal.In addition, flat calibration signal can fall within default working range, optimal or peak signal is not necessarily needed to be.Change speech It, any default measurement time for making flat calibration signal fall within default working range can serve as the flat quasi- amount of benchmark conductive bar The survey time.Next when each group of non-referenced conductive bar is provided drive signal value, when respectively according to each default measurement Between adjust circuit for detecting, and detect the signal of this detecting conductive bar, or detect a plurality of or all detecting conductive bars the letters Number totalling, to compare the default measurement time closest to flat calibration signal, as relative to the group for being provided drive signal The flat quasi- measurement time of non-referenced conductive bar.In this way, each group of flat quasi- measurement time of driving conductive bar is can determine whether out, according to every One group of flat quasi- measurement time of driving conductive bar adjusts the measurement time of circuit for detecting, can obtain and relatively puts down accurate image, i.e. shadow The difference very little between signal as in.

It is using identical flat quasi- measurement with all detecting conductive bars when each drive signal is provided in preceding description Time, the art there is the technical staff of usual knowledge it can be deduced that can also be when each drive signal is provided, Each group of detecting conductive bar uses and the respective flat quasi- measurement time is respectively adopted.In other words, it is to be provided in each drive signal When, respectively each default measurement time to each group of detecting conductive bar carry out the measurement of signal, to judge the flat standard of most convergence The prediction of signal measures the time, obtains each group of driving conductive bar respectively accordingly and is provided each detecting conduction during drive signal The flat quasi- measurement time of bar.

In the foregoing, one can be selected by first embodiment, second embodiment, 3rd embodiment and fourth embodiment Plant or select various mixing to implement, the present invention is not any limitation as.Can select away from detecing additionally, when flat calibration signal is measured One or more farthest detecting conductive bar of slowdown monitoring circuit carries out the detecting of signal, to produce flat calibration signal.For example, it may be with A farthest signal for detecting conductive bar produces flat calibration signal, or the differential wave of farthest two detecting conductive bars is produced In life calibration signal (difference), or farthest three detecting conductive bars first two with the differential letter of rear two detecting conductive bars Number difference produce flat calibration signal (double difference value).In other words, flat calibration signal can be signal value, difference or double difference value, it is also possible to It is other values according to the one or more signal generation for detecting conductive bar.

Figure 12 is referred to, is the measuring signal method according to a kind of touch-screen of the invention.As shown in step 1210, there is provided Touch-screen, touch-screen includes that a plurality of driving conductive bar arranged in parallel is a plurality of with what a plurality of detecting conductive bar arranged in parallel was constituted Conductive bar, described driving conductive bar overlaps on multiple crossover regions with described detecting conductive bar.In addition, such as step 1220 institute Show, select one of described driving conductive bar or one group of driving conductive bar as benchmark conductive bar, other or other group is driven Moving conductive bar is used as non-referenced conductive bar.Benchmark conductive bar can with first or first group of driving conductive bar, or other The driving conductive bar of position, the present invention is not any limitation as.Next, as shown in step 1230, there is provided drive signal is to benchmark Conductive bar, and the signal of at least one described detecting conductive bar is detected according to one of described parameter group.Also, such as step Shown in 1240, when the signal of at least one described detecting conductive bar is not in the range of preset signals, sequentially join according to other One of array detects the signal of at least one described detecting conductive bar, until the letter of at least one described detecting conductive bar Number fall in the range of preset signals.Additionally, as shown in step 1250, described in when being provided drive signal with benchmark conductive bar extremely A few detecting conductive bar falls within signal in the range of preset signals as flat calibration signal, and with the ginseng of benchmark conductive bar foundation Array as benchmark conductive bar initial parameter group.Next, as shown in step 1260, be sequentially provided respectively drive signal to Each or each group of non-referenced conductive bar, also, as shown in step 1270, in each or each group of non-referenced conductive bar quilt When providing drive signal, parameter group sequentially described in detects the signal of at least one described detecting conductive bar respectively. Afterwards, as shown in step 1280, determine in each or each group initial parameter group of non-referenced conductive bar, wherein respectively every One or each group of non-referenced conductive bar are provided drive signal value, according at least one described detecting of initial parameter group detecting The signal of conductive bar is compared to the signal according at least one described detecting conductive bar of other parameters group detecting closest to flat standard Signal.

According to previously described first, second, third and fourth embodiment, parameter group can be for changing delay phase The measurement time of difference, the resistance of variable resistor, the enlargement ratio of circuit for detecting and circuit for detecting.In the first example of the invention In, drive signal is that the resistance of wherein variable resistor is according to quilt via variable resistor to described at least detecting conductive bar The initial parameter for providing the conductive bar of drive signal changes.In the second example of the invention, time of detection signal be according to Change according to the initial parameter of the conductive bar for being provided drive signal.In the 3rd example of the invention, drive signal be via Amplifier is supplied at least one described detecting conductive bar after amplifying, the multiplying power that wherein amplifying circuit amplifies is that foundation is provided drive The initial parameter of the conductive bar of dynamic signal changes.Additionally, in the 4th example of the invention, described at least detecting conductive bar Signal be just to start detecting after postponing phase difference, wherein it is according to being provided the conductive bar of drive signal to postpone phase difference Initial parameter change.

Accordingly, Fig. 4 is referred to, is included according to a kind of measuring signal of touch-screen of the invention：Touch-screen, drive circuit 41st, circuit for detecting 42 and control circuit 45.Touch-screen includes that a plurality of driving conductive bar 151 arranged in parallel is more with arranged in parallel The a plurality of conductive bar of the bar detecting composition of conductive bar 152, described drives conductive bar 151 overlapping with described detecting conductive bar 152 In multiple crossover regions.Drive circuit 41 provides drive signal to one or one group of driving conductive bar 151, wherein described driving is led Conductive bar on the basis of one of electric bar 151 or one group of driving conductive bar 151, and other or other group drives conductive bar 151 It is non-referenced conductive bar.Circuit for detecting 42 is detectd according to one of multigroup parameter group when each drive signal is provided by least one The signal for surveying conductive bar 152 produces the assessment signal of the driving conductive bar 151 for being provided drive signal.Control circuit 45, by institute The parameter group stated selects one group of initial parameter group as benchmark conductive bar, with what is produced by circuit for detecting according to initial parameter group Assessment signal as flat calibration signal, and by described parameter group select respectively each or each group non-referenced conductive bar just Beginning parameter group, each of which or each group of non-referenced conductive bar are according to the assessment signal of initial parameter group generation compared to foundation The assessment signal that other parameters group is produced is closest to flat calibration signal.Additionally, described parameter group can be previously stored storage circuit 43。

Assessment signal can be produced according to one or more signal for detecting conductive bar.For example, assessment signal is by institute One of detecting conductive bar stated is produced.Again for example, assessment signal is added by the signal of at least two of described detecting conductive bar It is total to produce.

Additionally, in one example of the present invention, controller can be one of parameter group sequentially described in respectively by detecing Slowdown monitoring circuit produces the assessment signal of benchmark conductive bar, and with the assessment signal institute foundation of the maximum benchmark conductive bar of generation Parameter group as benchmark conductive bar initial parameter group.In another example of the present invention, controller can be sequentially according to institute One of parameter group stated is produced the assessment signal of benchmark conductive bar by circuit for detecting respectively, and with first qualified base The parameter group of the assessment signal institute foundation of quasi- conductive bar as benchmark conductive bar initial parameter group.

According to previously described first, second, third and fourth embodiment, parameter group can be for changing delay phase The measurement time of difference, the resistance of variable resistor, the enlargement ratio of circuit for detecting and circuit for detecting.In the first example of the invention In, drive signal is that wherein circuit for detecting is that foundation is provided driving via variable resistor to described at least detecting conductive bar The initial parameter of the conductive bar of signal changes the resistance of variable resistor.In the second example of the invention, circuit for detecting be according to Change the time of detection signal according to the initial parameter of the conductive bar for being provided drive signal.In the 3rd example of the invention, Drive signal is that described at least detecting conductive bar is supplied to after amplifying via amplifier, and wherein circuit for detecting is that foundation is provided The initial parameter of the conductive bar of drive signal come change amplifying circuit amplification multiplying power.Additionally, in the 4th example of the invention, Circuit for detecting is just to start the signal at least detecting conductive bar described in measurement after postponing phase difference, and wherein circuit for detecting is Change delay phase difference according to the initial parameter of the conductive bar for being provided drive signal.

The above, is only presently preferred embodiments of the present invention, and any formal limitation is not made to the present invention, though So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention, any to be familiar with this professional technology people Member, without departing from the scope of the present invention, when making a little change or modification using the technology contents of the disclosure above It is the Equivalent embodiments of equivalent variations, as long as being the content without departing from technical solution of the present invention, according to technical spirit of the invention Any simple modification, equivalent variations and the modification made to above example, still fall within the range of technical solution of the present invention.

Claims (10)

1. the measuring signal device of a kind of touch-screen, it is characterised in that include：

Drive circuit, there is provided a plurality of arranged in parallel one or one group drive driving conductive bar in the middle of of the drive signal to touch-screen Moving conductive bar, wherein conductive bar on the basis of of described driving conductive bar or one group of driving conductive bar, and other or It is non-referenced conductive bar that other groups drive conductive bar；

Circuit for detecting, when each drive signal is provided, according to one of multigroup parameter group by a plurality of parallel of the touch-screen The signal of at least one detecting conductive bar in the middle of the detecting conductive bar of arrangement is provided the driving of the drive signal to produce The assessment signal of conductive bar, wherein described driving conductive bar overlaps on multiple crossover regions with described detecting conductive bar；And

Control circuit, selects one group of initial parameter group as the benchmark conductive bar, with initial according to this by described parameter group The assessment signal that parameter group is produced by the circuit for detecting selects each respectively as flat calibration signal by described parameter group Bar or each group of initial parameter group of the non-referenced conductive bar, each of which or each group of non-referenced conductive bar are first according to this The assessment signal that beginning parameter group is produced is compared to assessment signal produced according to other parameter groups closest to the flat calibration signal.

2. the measuring signal device of touch-screen according to claim 1, it is characterised in that the control circuit is sequentially according to institute One of parameter group stated is produced the assessment signal of the benchmark conductive bar by the circuit for detecting respectively, and maximum with what is produced The parameter group of the assessment signal institute foundation of the benchmark conductive bar as the benchmark conductive bar the initial parameter group.

3. the measuring signal device of touch-screen according to claim 1, it is characterised in that the control circuit is sequentially according to institute One of parameter group stated is produced the assessment signal of the benchmark conductive bar by the circuit for detecting respectively, and meets bar with first The parameter group of the assessment signal institute foundation of the benchmark conductive bar of part as the benchmark conductive bar the initial parameter group.

4. the measuring signal device of touch-screen according to claim 1, it is characterised in that the assessment signal is by described One of detecting conductive bar is produced.

5. the measuring signal device of touch-screen according to claim 1, it is characterised in that the assessment signal is by described The signal of at least two of detecting conductive bar is added up and produced.

6. the measuring signal device of touch-screen according to claim 1, it is characterised in that the signal of the detecting conductive bar is Via a variable resistor to the circuit for detecting, wherein the circuit for detecting be according to the conductive bar for being provided drive signal this is first Beginning parameter group changes the resistance of the variable resistor.

7. the measuring signal device of touch-screen according to claim 6, it is characterised in that the variable resistor is to be built into collection Into in circuit.

8. the measuring signal device of touch-screen according to claim 1, it is characterised in that the circuit for detecting is according to being carried Change the time of detection signal for the initial parameter group of the conductive bar of drive signal.

9. the measuring signal device of touch-screen according to claim 1, it is characterised in that the signal of the detecting conductive bar is There is provided after amplifying via amplifier to the circuit for detecting, the wherein circuit for detecting is according to the conductive bar for being provided drive signal The initial parameter group come change the amplifier amplification multiplying power.

10. the measuring signal device of touch-screen according to claim 1, it is characterised in that the circuit for detecting is by postponing Just start the signal of at least detecting conductive bar described in measuring after phase difference, the wherein circuit for detecting is that foundation is provided driving The initial parameter group of the conductive bar of signal changes the delay phase difference.