CN108073329A - Touch device and its driving method and terminal - Google Patents
Touch device and its driving method and terminal Download PDFInfo
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- CN108073329A CN108073329A CN201810098830.0A CN201810098830A CN108073329A CN 108073329 A CN108073329 A CN 108073329A CN 201810098830 A CN201810098830 A CN 201810098830A CN 108073329 A CN108073329 A CN 108073329A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
Abstract
This application discloses a kind of touch device and its driving method and terminal, driving method includes：Each sensing coordinate is scanned using drive signal to obtain detected value and relatively be touched using detected value compared with a reference value to detect, drive signal has multiple driving frequencies, it is touched under each driving frequency using the detection of corresponding a reference value, the touch location detected in last frame is stored as mark position before driving frequency is updated；The initial detecting value of each sensing coordinate is obtained after driving frequency is updated；Touch at judge mark position whether after driving frequency is updated there are still；According to judging result, each a reference value for sensing coordinate after being updated is compensated to the corresponding initial detecting value of mark position.Touch device and its driving method provided by the invention and terminal can compensate a reference value of each sensing coordinate after driving frequency is updated according to the touch information before update so that touch device can normally detect touch, be well adapted to current application environment.
Description
Technical field
The present invention relates to technical field of touch control, more particularly, to touch device and its driving method and terminal.
Background technology
Display touch device is integrated with display device and touch device, can carry out picture while detecting and touching and show
Show.Wherein, touch device is mainly scanned touch electrode using drive signal, and according to the capacitance change that detects and
The a reference value of each sensing coordinate judges whether touched in touch-surface.
When showing that touch device detects noise, it usually needs adjust the driving frequency of drive signal and touched with reducing display
The interference that control device is received by noise, the process of this adjustment driving frequency are referred to as frequency hopping.
In traditional touch device, need to regenerate a reference value of each sensing coordinate after the generation of each frequency hopping,
Touch device is enabled to be well adapted to current environment.However, traditional touch device is disadvantageous in that：When frequency hopping is sent out
When life, touchs that touch-surface occurs may influence whether the new a reference value generated after frequency hopping, cause after frequency hopping to touch
Abnormal detection.
In order to solve the above-mentioned technical problem, it has been pre-stored in a kind of prior art touch device corresponding with different driving frequency
Each sensing coordinate a series of a reference values, when touch device frequency hopping to a certain driving frequency, touch device extraction and should
The corresponding a reference value of driving frequency is to replace the corresponding a reference value of each sensing coordinate before frequency hopping.This deficiencies in the prior art it
Be in：Since touch device is more sensitive to environmental change, the corresponding a reference value of each sensing coordinate can be with temperature, humidity
Etc. environmental factors occur significant change, therefore a reference value to prestore generally can not be well matched with current touch device apply ring
Border also results in the abnormal detection touched after frequency hopping.
The content of the invention
In consideration of it, it is an object of the invention to provide a kind of touch device and its driving method and terminals, updating every time
Touch information before being updated after driving frequency according to driving frequency compensates a reference value of each sensing coordinate so that touches
Control device can normally detect touch after driving frequency is updated, and can be well adapted to current application environment.
According to the first aspect of the invention, a kind of driving method for touch device, the driving method bag are provided
It includes：Each sensing coordinate of touch device is scanned using drive signal to obtain detected value and using detected value compared with a reference value
It is relatively touched to detect, the drive signal has multiple driving frequencies, is examined under each driving frequency using corresponding a reference value
It surveys and touches, wherein, the touch location detected in last frame is stored as mark position before the driving frequency is updated；
Each initial detecting value for sensing coordinate is obtained after updating the driving frequency；Judge the marked locations touch whether
Update after the driving frequency there are still；According to judging result, the initial detecting value corresponding to the mark position carries out
Compensate a reference value of each sensing coordinate after being updated.
Preferably, the driving method further includes：Fit original detected value it is constant in certain threshold value in the case of touch
The compensating electric capacity of device and the relational expression of driving frequency are controlled, and before the driving frequency is updated, is obtained by the relational expression
To compensating electric capacity corresponding with new driving frequency and the compensating electric capacity is set.
Preferably, the relational expression of the compensating electric capacity and driving frequency includes：Cneg=kfd+T, wherein Cneg are represented
The capacitance of the compensating electric capacity, fd represent the driving frequency, and k and T represent non-zero natural number.
Preferably, the step of detection touches includes：Obtain the detected value of each sensing coordinate；Judge that each sensing is sat
Whether target influence value has been more than first threshold, and the influence value of each sensing coordinate is equal to the detected value and the benchmark
The difference of value, if so, judging to be touched at corresponding sensing coordinate, if it is not, then judging do not have at corresponding sensing coordinate
It touches.
Preferably, according to judging result, the initial detecting value corresponding to the mark position compensates to obtain
Include after update the step of a reference value of each sensing coordinate：If the touch of the marked locations is updating the driving
There are still then compensate to obtain to the initial detecting value of at least one sensing coordinate in the mark position after frequency
The a reference value of at least one sensing coordinate after update；If the touch of the marked locations is updating the driving frequency
It is not present after rate, then directly using the initial detecting value of each sensing coordinate as the base of each sensing coordinate after update
Quasi- value.
Preferably, the driving method further includes：By the sensing of each sensing coordinate in each mark position
The corresponding sensing coordinate of maximum and the maximum in value is stored as the first central value of the mark position respectively and center is sat
Mark, and judge the marked locations touch whether after the update driving frequency there are still the step of include：It is updating
After the driving frequency, the average of all initial detecting values of sensing coordinate is obtained；By the institute of each centre coordinate
State second central value of the difference of initial detecting value and the average as the centre coordinate；It will be described in each centre coordinate
The absolute value of the difference of second central value and first central value is as the corresponding changing value of the centre coordinate；And if only if described
Second central value is more than the first threshold and the changing value and is less than or during less than or equal to second threshold, judges the centre coordinate
There are still touches in the updated for the corresponding touch location.
Preferably, if the touch of the marked locations is after the driving frequency is updated, there are still to the mark
The initial detecting value of at least one sensing coordinate compensates at least one sensing seat after being updated in position
Include described in target the step of a reference value：In the mark position, the initial detecting value of the centre coordinate is compensated, is made
The influence value of the centre coordinate is more than the first threshold after must compensating.
Preferably, in the mark position, the initial detecting value of the centre coordinate is compensated so that should after compensation
The influence value of centre coordinate includes more than the step of first threshold：In the mark position, the center is compensated
The initial detecting value of coordinate so that it is normal with presetting to be equal to the first threshold for the influence value of the centre coordinate after compensation
The sum of number.
Preferably, the driving method further includes：If it is detected in the last frame before updating the driving frequency
Touch belong to continuous touch, then after the driving frequency is updated, always using the mark position as current touch position
It puts, the first time occurred after detecting update touches.
Preferably, if updating the corresponding touch location of first time touch occurred after the driving frequency and the marker bit
Difference is put, then is updated in a frame or multiframe after the driving frequency, compensates at least one sensing coordinate in the mark position
The a reference value.
Preferably, the step of updating the driving frequency includes：The driving frequency is sequentially adjusted in default multiple
Frequency values, so as to which the frequency values of the touch device with minimal noise will be made to be determined as target in the multiple frequency values
Frequency values；If the driving frequency is updated to institute by the current corresponding noise figure of the driving frequency beyond specific threshold
State target frequency value.
According to the second aspect of the invention, a kind of touch device is additionally provided, wherein, including：Multiple capacitances, it is the multiple
Capacitance corresponds to each sensing coordinate respectively；Driving unit, for providing drive signal to the multiple capacitance and updating the drive
The driving frequency of dynamic signal；Sensing unit receives the drive signal, is sat for obtaining each sensing according to the drive signal
Target detected value is touched according to the detected value of each sensing coordinate and a reference value detection；First compensating unit, for by institute
It states the touch location detected in the last frame before driving frequency is updated and is stored as mark position, according in the driving
Whether frequency judges each mark position there are still touch after being updated, and provides each sensing according to judging result and sit
A reference value described in target.
Preferably, the touch device further includes the compensating electric capacity being connected with the sensing unit, and first compensation is single
Member adjusts the capacitance of the compensating electric capacity according to the compensating electric capacity and the relational expression of driving frequency that fit in advance so that different
The corresponding original detected value of the driving frequency kept constant in certain threshold value.
Preferably, first compensating unit includes：First memory module, for by each sensing in the mark position
The corresponding sensing coordinate of maximum and the maximum in the influence value of coordinate is stored as the first center of the mark position respectively
Value and centre coordinate, the influence value of each sensing coordinate are equal to the difference of the detected value and a reference value, computing module,
It, will for being obtained the average of all initial detecting values of sensing coordinates afterwards by driving unit update in the driving frequency
Difference between the initial detecting value and the average of each centre coordinate is as the centre coordinate corresponding second
Central value makees the absolute value of the difference between second central value of each centre coordinate and first central value
For the corresponding changing value of the centre coordinate；Judgment module is connected to receive second central value and institute with the computing module
Changing value is stated, is more than first threshold and if only if second central value and the changing value is less than or less than or equal to second threshold
When, the judgment module judge the corresponding mark position of the centre coordinate the driving frequency by the driving unit more
There are still touches after new；Reseting module, there are still touches after being updated for the driving frequency by the driving unit
The mark position, the reseting module are used to compensate the initial detecting of the corresponding centre coordinate of the mark position
Value so that the corresponding influence value of the centre coordinate is more than the first threshold after compensation；And second memory module, it is used for
The initial detecting value for each sensing coordinate that the sensing unit is provided is stored as a reference value of each sensing coordinate, and
The corresponding centre coordinate of the mark position is updated according to the initial detecting value compensated by the reseting module
The a reference value.
Preferably, the touch device further includes：Judging unit, it is last before the driving frequency is updated for judging
Whether the touch detected in one frame belongs to continuous touch；Detection unit, if the judging unit is judged in the driving unit
The touch detected in last frame before updating the driving frequency belongs to continuous touch, then realize update after, it is described
Before sensing unit detects the first time touch occurred after update, the detection unit judges that the continuous touch does not terminate simultaneously
Using the mark position as current touch location；And second compensating unit, if the driving frequency is single by the driving
The corresponding touch location of first time touch occurred after member update is different from the mark position, then second compensating unit exists
The driving frequency is compensated at least one sensing in the mark position in the updated frame of the driving unit or multiframe
The a reference value of coordinate.
According to the third aspect of the invention we, a kind of terminal is additionally provided, including any touch device as described above.
Touch device and its driving method provided by the invention and terminal are by adjusting compensating electric capacity compensating electric capacity
Capacitance is with driving frequency linear change, so as to which the original detected value for ensureing each sensing coordinate remains permanent in certain threshold value
It is fixed, and by after driving frequency is updated to update before a reference value of touch location that detects in last frame mend
It repays, it is therefore prevented that updated a reference value deviation occurs and influences detection of the touch device to touch；Before and after frequency hopping, if same
The touch-control occurred at touch location does not change, and touch device and its driving method provided by the invention can be updated in driving frequency
The touch-control being accurately detected afterwards at the touch location；Simultaneously as touch device provided by the invention and its driving method
The a reference value of each sensing coordinate is regenerated after update driving frequency every time, therefore it is good that touch device can be allowed to have
Good adaptive capacity to environment improves the accuracy of detection of touch.
In some preferred embodiments, touch device and its driving method provided by the invention and terminal can update
Reduction update continuous touch unfinished before exactly after driving frequency so that touch device being capable of the intactly company of detecting
Continuous continuous touch, avoids due to breakpoint problem caused by frequency hopping.
Description of the drawings
By the description referring to the drawings to the embodiment of the present invention, above-mentioned and other purposes of the invention, feature and
Advantage will be apparent from.
Fig. 1 shows the equivalent circuit diagram of touch device.
Fig. 2 shows the flow diagram of the driving method of the touch device of first embodiment of the invention.
Fig. 3 shows the flow diagram of the driving method of the touch device of second embodiment of the invention.
Fig. 4 shows the schematic block diagram of the touch device of third embodiment of the invention.
Fig. 5 shows the schematic block diagram of the touch device of fourth embodiment of the invention.
Specific embodiment
Hereinafter reference will be made to the drawings is more fully described the present invention.In various figures, identical element is using similar attached
Icon is remembered to represent.For the sake of clarity, the various pieces in attached drawing are not necessarily to scale.In addition, it may not show in figure
Go out some well known parts.
Many specific details of the present invention, such as the structure of device, material, size, processing work is described hereinafter
Skill and technology, to be more clearly understood that the present invention.But it just as the skilled person will understand, can not press
The present invention is realized according to these specific details.
The present invention can be presented in a variety of manners, some of them example explained below.
Fig. 1 shows the equivalent circuit diagram of touch device.
Touch device 100 usually mainly includes sensing unit 110, driving unit 120 and in excitation electrode and induced electricity
The multiple inductance capacitance C formed between poleT。
The multiple inductance capacitance CTIt is arranged in array, each inductance capacitance CTCorresponding sensing coordinate.Driving unit
120 are connected to the excitation electrode of all rows, for providing drive signal Tx1 to Txm in a manner of scanning, so as in a frame according to
It is secondary to provide the drive signal with driving frequency fd to the excitation electrode do not gone together.Sensing unit 110 is connected to the sense of all row
Electrode is answered, so as to receive the inductive signal Rx1 to Rxn of respective column.Wherein, m and n is non-zero natural number.
Sensing unit 110 detects corresponding current value according to each inductive signal Rx1 to Rxn, further according to electric current
The size of value obtains detected value, and using the difference of the corresponding detected value of each sensing coordinate and a reference value as the sense of the sensing coordinate
Should be worth, the influence value be used for characterize it is each sensing coordinate at capacitance change, so as to by it is each sensing coordinate sensing
Value compared with first threshold with judge it is each sensing coordinate at whether touched.
In order to improve sensing unit 110 to the accuracy of detection of touch and the signal-to-noise ratio of touch device 100, sensing unit 110
Usually it is connected with compensating electric capacity (Fig. 1 is not shown), so that touching more accurately to be detected.
Fig. 2 shows the flow diagram of the driving method of the touch device of first embodiment of the invention.
As shown in Fig. 2, the driving of the touch device (such as touch device 100 shown in FIG. 1) of first embodiment of the invention
Method includes step S210 to S280.
In step S210, the relational expression of compensating electric capacity and driving frequency is fitted, and is set and mended by the relational expression
Repay the capacitance of capacitance.
Specifically, the capacitance at each sensing coordinate is mended using compensating electric capacity (being connected with sensing unit)
Repay, and according to fit in advance original detected value it is constant in the case of the compensating electric capacity of touch device and the relation of driving frequency
Formula sets the capacitance Cneg of compensating electric capacity, capacitance Cneg and the driving frequency of compensating electric capacity according to newer driving frequency fd
There are linear relationships between rate fd：Cneg=kfd+T, wherein, k and T represent non-zero natural number.
In step S220, under current driving frequency fd, detected and touched according to a reference value base0 of each sensing coordinate
It touches.
Specifically, in step S220, based under current driving frequency fd it is each sensing coordinate a reference value base0,
The influence value sense0 of each sensing coordinate is obtained, each influence value sense0 for sensing coordinate characterizes the electricity at the sensing coordinate
Hold variation delta C；When influence value is more than first threshold TH1, it is characterized at corresponding sensing coordinate and detects touch-control.
In step S230, in the last frame before updating driving frequency fd, the touch location detected is stored as
Mark position mark0.
Specifically, in step S230, by the maximum among the influence value of each sensing coordinate in mark position mark0
Sense0_max and the corresponding sensing coordinate of the maximum are stored as the first central value mid1 and the center of the mark position respectively
Coordinate pos1.
In step S240, the driving frequency fd of drive signal is updated.
Specifically, in step S240, driving frequency fd is sequentially adjusted in default multiple frequency values, so as to by sweeping
The mode of frequency determines to make the target frequency value Fn of the noise minimum of touch device in multiple frequency values.If current driving frequency fd
Corresponding noise figure exceeds specific threshold, then the driving frequency fd of drive signal is updated to target frequency value Fn.
In step s 250, after driving frequency fd is updated, the initial detecting value of each sensing coordinate is obtained
rawdata0。
Specifically, in step s 250, after update driving frequency fd every time, according to the original value of each sensing coordinate
Obtain the initial detecting value rawdata0 of each sensing coordinate.
In step S260, whether the touch at the mark0 of judge mark position still has after driving frequency fd is updated.
If in the presence of performing step S270；If being not present, step S280 is performed.
Specifically, step S260 includes：After driving frequency fd is updated, the initial detecting value of all sensing coordinates is obtained
Average avg_rawdata；By the difference of the initial detecting value rawdata0 of each centre coordinate pos1 and average avg_rawdata
The second central value mid2 as centre coordinate pos1；It will be in the second central value mid2 of each centre coordinate pos1 and first
The absolute value of the difference of center value mid1 | mid2-mid1 | as the corresponding changing value Δ mid of centre coordinate pos1；And if only if
Two central value mid2 are more than first threshold TH1 and changing value Δ mid and are less than or during less than or equal to second threshold TH2, judge in this
There are still touch in the updated for the corresponding touch locations of heart coordinate pos1.Wherein, first threshold TH1 represents the decision threshold touched
Value, second threshold TH2 represent tolerable error threshold, first threshold TH1 and second threshold TH2 can according to actual conditions into
Row is set.
In step S270, in mark position mark0 it is at least one sensing coordinate initial detecting value rawdata0 into
Row compensates a reference value base0 of at least one sensing coordinate after being updated.Then, return and perform step S220.
Specifically, in step S270, in each mark position mark0, the initial detecting of compensation centre coordinate pos1
Value so that the influence value sense0 of centre coordinate pos1 is more than first threshold TH1 after compensation.In a preferred embodiment, mend
The influence value sense0 for repaying rear center coordinate pos1 is equal to the sum of first threshold TH1 and preset constant m, and preset constant m is more than 0,
For example, 1.In some other embodiments, other sensings in mark position in addition to centre coordinate can also be sat simultaneously
Mark is compensated accordingly.
In step S280, directly the initial detecting value rawdata0 of each sensing coordinate is sat as the sensing after update
Target a reference value base0.Then, return and perform S220.
Its driving method provided in this embodiment is by adjusting the capacitance of compensating electric capacity compensating electric capacity with driving frequency
Rate linear change, so as to which the original detected value for ensureing each sensing coordinate remains constant in certain threshold value, and by updating
The a reference value of touch location after driving frequency to being detected in last frame before update compensates, it is therefore prevented that updated
There is deviation and influences detection of the touch device to touch in a reference value；Before and after frequency hopping, if occur at same touch location
Touch-control does not change, and touch device provided in this embodiment can be accurately detected the touch location after driving frequency updates
The touch-control at place；Simultaneously as touch device provided in this embodiment every time update driving frequency after regenerate it is each
Sense a reference value of coordinate, therefore can allow touch device that there is good adaptive capacity to environment, improve the detection essence of touch
Degree.
Fig. 3 shows the flow diagram of the driving method of the touch device of second embodiment of the invention.
As shown in figure 3, the driving method of the touch device of second embodiment of the invention and the invention described above first embodiment
Driving method it is essentially identical, some steps are omitted including step S210 to S280, therefore in Fig. 3.However, the present invention the
The driving method of two embodiments further includes step S310 and S320.
After step S220, before step S240, performing step S310, (step S310 can be held before step S230
Row, can also perform after step S230, can also simultaneously be performed with step S230).In step S310, judge updating
Whether the touch detected in the last frame before driving frequency belongs to continuous touch.The continuous for example, finger that touches is in touch-control
Stroke on device touches.If so, step S320 is performed after step S240 and S250；If it is not, then directly perform step
Rapid S240 to S280.
In step s 320, judge that continuous touch does not terminate and (calculate the center-of-mass coordinate of mark position mark0 by barycenter
Method obtains, the coordinate as reported before frequency hopping) it is reported as current touch location, until sensing unit detects update driving
First occurred after frequency is touched (at this point, sensing unit directly drives the initial detecting value of each sensing coordinate as update
The a reference value of each sensing coordinate after dynamic frequency, and detected and touched according to a reference value of each sensing coordinate).Then, step is performed
Rapid S260 to S280.
In some preferred embodiments, if the first time occurred after update driving frequency touches corresponding touch location
It is different from each mark position determined in the last frame before frequency hopping, then in the frame after updating driving frequency or multiframe,
The a reference value base0 of at least one sensing coordinate (such as centre coordinate pos1) in each mark position is compensated, is touched with eliminating
Influence to a reference value base0 of each sensing coordinate.
The driving method of the touch device of second embodiment of the invention is on the basis of above-mentioned first embodiment, additionally it is possible to
Update driving frequency reduction update driving frequency continuous touch unfinished before exactly afterwards so that touch device can be complete
Site preparation detects continuous touch, avoids due to breakpoint problem caused by frequency hopping.
Fig. 4 shows the schematic block diagram of the touch device of third embodiment of the invention.
As shown in figure 4, the touch device 400 of third embodiment of the invention includes sensing unit 410, driving unit 420, the
One compensating unit 430 and the multiple inductance capacitance C formed between excitation electrode and induction electrodeT, plurality of induced electricity
Hold CTEach sensing coordinate is corresponded to respectively.
Driving unit 420 updates the driving frequency of drive signal for providing the drive signal with driving frequency fd
To realize frequency hopping.Specifically, driving unit 420 makes touch device 400 have by carrying out frequency sweep to each inductance capacitance to obtain
There is the target frequency value Fn of minimum noise figure, if the current corresponding noise figures of driving frequency fd exceed specific threshold, drive
Moving cell 420 adjusts the driving frequency fd of drive signal to target frequency value Fn.
Sensing unit 410 receives drive signal, for obtaining the detected value of each sensing coordinate according to drive signal, so as to
It can be touched according to the detected value and a reference value detection of each sensing coordinate：When the detected value and the sensing coordinate of sensing coordinate
The difference (being denoted as influence value sense0, influence value sense0 characterizes the capacitance change Δ C at the sensing coordinate) of a reference value base0
During more than first threshold TH1, sensing unit 410 judges to be touched at the sensing coordinate.Wherein, in each driving frequency quilt
After update, sensing unit 410 can obtain initial detecting value rawdata0 (for example, update driving frequencies of each sensing coordinate
The detected value obtained in first frame after rate).
Specifically, touch device 400 further includes the compensating electric capacity (Fig. 4 is not shown) being connected with sensing unit 410, and first mends
Repay the capacitance that unit adjusts compensating electric capacity according to the relational expression of the compensating electric capacity and driving frequency fitted in advance so that different
The corresponding original detected values of driving frequency fd kept constant in certain threshold value.For example, the capacitance Cneg of compensating electric capacity with
Driving frequency fd is in a linear relationship：Cneg=kfd+T, wherein, k and T represent non-zero natural number.
First compensating unit 430 is used to deposit the touch location detected in the last frame before updating driving frequency fd
It stores up as mark position mark0.Meanwhile first compensating unit 430 can be judged according to the initial detecting value of each sensing coordinate it is every
Whether a mark position according to judging result to sensing unit 410 provides each a reference value that senses coordinate there are still touch
base0。
Specifically, the first compensating unit 430 includes the first memory module, the second memory module, computing module, judgment module
And reseting module.
First memory module is used for the maximum sense0_ in the detected value of each sensing coordinate in each mark position
Max and the corresponding sensing coordinate of the maximum are stored as the first central value mid1 of mark position mark0 and center seat respectively
Mark pos1,
Computing module is used to after the update of driving frequency fd drived units 420 obtain the initial inspection of all sensing coordinates
The average avg_rawdata of measured value, by the initial detecting value rawdata0 of each centre coordinate pos1 and average avg_rawdata
Between difference as the corresponding second central value mid2 of centre coordinate pos1, by the second center of each centre coordinate pos1
The absolute value of difference between value mid2 and the first central value mid1 | mid2-mid1 | as the corresponding changes of centre coordinate pos1
Change value Δ mid.
Judgment module is connected with computing module to receive the second central value mid2 and changing value Δ mid, and if only if second
Central value mid2 is more than first threshold TH1 and changing value Δ mid and is less than or during less than or equal to second threshold TH2, and judgment module is sentenced
Determining the corresponding mark position mark0 of centre coordinate pos1, there are still touch after the update of driving frequency fd drived units 420
It touches.
There are still the mark position mark0 of touch after being updated for driving frequency fd drived units 420, reset
Module is used to compensate the initial detecting value rawdata0 of the corresponding centre coordinate pos1 of mark position mark0 so that after compensation
The corresponding influence value sense0 of centre coordinate pos1 are more than first threshold TH1.
The initial detecting value rawdata0 that second memory module is used for each sensing coordinate for providing sensing unit 410 is deposited
It stores up as a reference value base0 of each sensing coordinate, and the initial detecting value rawdata0 crossed according to the module for compensating that is reset updates
The a reference value base0 of the corresponding centre coordinate pos1 of mark position mark0.
Preferably, there are still in the touch location of touch after driving frequency is updated, reseting module is used to compensate marker bit
Put the corresponding initial detecting value rawdata0 of centre coordinate pos1 of mark0 so that centre coordinate pos1 is corresponding after compensation
Influence value sense0 is equal to the sum of first threshold TH1 and preset constant m, and (preset constant m is more than 0, is, for example, 1).
Fig. 5 shows the schematic block diagram of the touch device of fourth embodiment of the invention.
As shown in figure 5, the touch device 500 of fourth embodiment of the invention and the touch device 400 of above-mentioned 3rd embodiment
It is essentially identical, the difference is that：Touch device 500 further includes judging unit 510, the compensation list of detection unit 520 and second
Member 530, so as to recover unclosed continuous touch before update driving frequency after driving frequency fd is updated.
Whether the touch that judging unit 510 is used to judge to detect in the last frame before updating the driving frequency belongs to
It is touched in continuous.
If judging unit 510 judges what is detected in the last frame before driving unit 420 updates driving frequency fd
Touch belongs to continuous touch, then realize update after, sensing unit 410 detect after update occur first touch before,
Detection unit 520, which judges continuously to touch, not to be terminated and (obtains the center-of-mass coordinate of mark position mark0, i.e., by centroid algorithm
For the coordinate reported before frequency hopping) it is reported as current touch location.
If the first time that driving frequency fd drived units 420 occur after updating touches corresponding touch location with having stored
Mark position mark0 it is different, then the second compensating unit 530 in a 420 updated frame of driving frequency fd drived units or
It (is, for example, the centre coordinate of mark position mark0 that at least one sensing coordinate in mark position mark0 is compensated in multiframe
Pos1 a reference value base0).So as to, if continuous touches is not terminated before jumping driving frequency and being updated, judging unit
510th, 520 and second compensating unit 530 of detection unit can allow touch device 500 to continue to detect the continuous touch after frequency hopping
Subsequent action, avoid due to breakpoint problem caused by the update of driving frequency.
Fifth embodiment of the invention additionally provides a kind of terminal, including any touch device as described above.
In conclusion touch device provided by the invention and its driving method and terminal are mended by adjusting compensating electric capacity
The capacitance of capacitance is repaid with driving frequency linear change, so as to ensure the original detected value of each sensing coordinate in certain threshold value
Remain constant, and by after driving frequency is updated to update before a reference value of touch location that detects in last frame into
Row compensation, it is therefore prevented that updated a reference value deviation occurs and influences detection of the touch device to touch；Before and after frequency hopping, if together
The touch-control occurred at one touch location does not change, and touch device and its driving method provided by the invention and terminal can drive
The touch-control being accurately detected after dynamic frequency update at the touch location；Simultaneously as touch device provided by the invention and
Its driving method and terminal regenerate a reference value of each sensing coordinate after update driving frequency every time, therefore can
It allows touch device that there is good adaptive capacity to environment, improves the accuracy of detection of touch.
In some preferred embodiments, touch device and its driving method provided by the invention and terminal can update
Reduction update continuous touch unfinished before exactly after driving frequency so that touch device being capable of the intactly company of detecting
Continuous continuous touch, avoids due to breakpoint problem caused by frequency hopping.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Non-exclusive inclusion, so that process, method, article or equipment including a series of elements not only will including those
Element, but also including other elements that are not explicitly listed or further include as this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
Also there are other identical elements in process, method, article or equipment including the element.
According to the embodiment of the present invention as described above, these embodiments are there is no all details of detailed descriptionthe, also not
It is only the specific embodiment to limit the invention.Obviously, as described above, can make many modifications and variations.This explanation
Book is chosen and specifically describes these embodiments, is in order to preferably explain the principle of the present invention and practical application, so that affiliated
Technical field technical staff can be used using modification of the invention and on the basis of the present invention well.The present invention is only by right
The limitation of claim and its four corner and equivalent.
Claims (16)
1. a kind of driving method for touch device, the driving method includes：Utilize drive signal scanning touch device
To obtain detected value and relatively be touched using detected value compared with a reference value to detect, the drive signal has each sensing coordinate
Multiple driving frequencies are touched using corresponding a reference value to detect under each driving frequency,
Wherein,
The touch location detected in last frame is stored as mark position before the driving frequency is updated；
The initial detecting value of each sensing coordinate is obtained after the driving frequency is updated；
Judge the marked locations touch whether after the driving frequency is updated there are still；
According to judging result, the initial detecting value corresponding to the mark position compensates each sense after being updated
Answer a reference value of coordinate.
2. driving method according to claim 1, wherein, the driving method further includes：
Fit original detected value it is constant in certain threshold value in the case of the compensating electric capacity of touch device and the pass of driving frequency
It is formula, and before the driving frequency is updated, compensating electric capacity corresponding with new driving frequency is obtained by the relational expression
And the compensating electric capacity is set.
3. driving method according to claim 2, wherein, the relational expression of the compensating electric capacity and driving frequency includes：
Cneg=kfd+T, wherein Cneg represent the capacitance of the compensating electric capacity, and fd represents the driving frequency, and k and T represent non-
Zero natural number.
4. driving method according to claim 1, wherein, detecting the step of touching includes：
Obtain the detected value of each sensing coordinate；
Whether the influence value for judging each sensing coordinate has been more than first threshold, and the influence value of each sensing coordinate is equal to institute
The difference of detected value and a reference value is stated,
If so, judge to be touched at corresponding sensing coordinate,
If it is not, then judge not touch at corresponding sensing coordinate.
5. driving method according to claim 4, wherein, it is corresponding to the mark position described according to judging result
Initial detecting value compensate after being updated it is each sensing coordinate a reference value the step of include：
If the touch of the marked locations is after the driving frequency is updated, there are still in the mark position at least one
The initial detecting value of a sensing coordinate compensates the benchmark of at least one sensing coordinate after being updated
Value；
If the touch of the marked locations is not present after the driving frequency is updated, directly by the institute of each sensing coordinate
State a reference value of the initial detecting value as each sensing coordinate after update.
6. driving method according to claim 5, wherein, it further includes：Each sensing in each mark position is sat
The corresponding sensing coordinate of maximum and the maximum in influence value described in target is stored as in the first of the mark position respectively
Center value and centre coordinate,
And judge the marked locations touch whether after updating the driving frequency there are still the step of include：
After the driving frequency is updated, the average of all initial detecting values of sensing coordinate is obtained；
Using the difference of the initial detecting value of each centre coordinate and the average as the second center of the centre coordinate
Value；
Using the absolute value of the difference of second central value of each centre coordinate and first central value as the center
The corresponding changing value of coordinate；
It is more than the first threshold and if only if second central value and the changing value is less than or less than or equal to second threshold
When, judge that there are still touches in the updated for the corresponding touch location of the centre coordinate.
7. driving method according to claim 6, wherein, if the touch of the marked locations is updating the driving frequency
There are still then compensate to obtain more to the initial detecting value of at least one sensing coordinate in the mark position after rate
Include after new the step of a reference value of at least one sensing coordinate：
In the mark position, the initial detecting value of the centre coordinate is compensated so that the centre coordinate after compensation
The influence value is more than the first threshold.
8. driving method according to claim 7, wherein, in the mark position, compensate the institute of the centre coordinate
State initial detecting value so that the influence value of the centre coordinate includes more than the step of first threshold after compensation：
In the mark position, the initial detecting value of the centre coordinate is compensated so that the centre coordinate after compensation
The influence value is equal to the sum of the first threshold and preset constant.
9. driving method according to claim 1, wherein, it further includes：
If the touch detected in the last frame before updating the driving frequency belongs to continuous touch, described in update
After driving frequency, always using the mark position as current touch location, the first time occurred after detecting update
It touches.
10. driving method according to claim 9, wherein, it is touched if updating the first time occurred after the driving frequency
Corresponding touch location is different from the mark position, then updates in a frame or multiframe after the driving frequency, described in compensation
The a reference value of at least one sensing coordinate in mark position.
11. driving method according to claim 1, wherein, the step of updating the driving frequency, includes：
The driving frequency is sequentially adjusted in default multiple frequency values, so as to which the touch-control will be made in the multiple frequency values
The frequency values that device has minimal noise are determined as target frequency value；
If the driving frequency is updated to the mesh by the current corresponding noise figure of the driving frequency beyond specific threshold
Mark frequency values.
12. a kind of touch device, wherein, including：
Multiple capacitances, the multiple capacitance correspond to each sensing coordinate respectively；
Driving unit, for providing drive signal to the multiple capacitance and updating the driving frequency of the drive signal；
Sensing unit receives the drive signal, for obtaining the detected value of each sensing coordinate, root according to the drive signal
It is touched according to the detected value and a reference value detection of each sensing coordinate；
First compensating unit, for the touch location storage detected in the last frame before the driving frequency is updated
For mark position, each mark position is judged afterwards whether there are still touch according to being updated in the driving frequency, and
The a reference value of each sensing coordinate is provided according to judging result.
13. touch device according to claim 12, wherein, the touch device is further included to be connected with the sensing unit
Compensating electric capacity,
First compensating unit adjusts the compensation electricity according to the relational expression of the compensating electric capacity and driving frequency fitted in advance
The capacitance of appearance so that the corresponding original detected value of the different driving frequencies is kept constant in certain threshold value.
14. touch device according to claim 13, wherein, first compensating unit includes：
First memory module, for by the mark position it is each sensing coordinate influence value in maximum and the maximum
Corresponding sensing coordinate is stored as the first central value and centre coordinate of the mark position, the sense of each sensing coordinate respectively
The difference equal to the detected value and a reference value should be worth,
Computing module, for being obtained the initial inspections of all sensing coordinates afterwards by driving unit update in the driving frequency
The average of measured value is sat the difference between the initial detecting value of each centre coordinate and the average as the center
Corresponding second central value is marked, by the difference between second central value of each centre coordinate and first central value
The absolute value of value is as the corresponding changing value of the centre coordinate；
Judgment module is connected to receive second central value and the changing value with the computing module, and if only if described
Second central value is more than first threshold and the changing value and is less than or during less than or equal to second threshold, and the judgment module judges should
There are still touches after the driving frequency is updated by the driving unit for the corresponding mark position of centre coordinate；
Reseting module, for the driving frequency by the driving unit update after there are still touch the mark position,
The reseting module is used to compensate the initial detecting value of the corresponding centre coordinate of the mark position so that should after compensation
The corresponding influence value of centre coordinate is more than the first threshold；And
Second memory module, the initial detecting value of each sensing coordinate for the sensing unit to be provided are stored as each sense
The a reference value of coordinate is answered, and the mark position is updated according to the initial detecting value compensated by the reseting module
The a reference value of the corresponding centre coordinate.
15. touch device according to claim 12, wherein, it further includes：
Judging unit, for judging whether the touch detected in the last frame before updating the driving frequency belongs to continuous
It touches；
Detection unit, if the judging unit is judged in the last frame before the driving unit updates the driving frequency
The touch detected belongs to continuous touch, then realize update after, the sensing unit detect first time for occurring after update
Before touch, the detection unit judges that the continuous touch does not terminate and using the mark position as current touch position
It puts；And
Second compensating unit, if the corresponding touch of first time touch that the driving frequency occurs after being updated by the driving unit
Position is different from the mark position, then second compensating unit is updated by the driving unit in the driving frequency
The a reference value of at least one sensing coordinate in the mark position is compensated in one frame or multiframe.
16. a kind of terminal, wherein, including such as claim 12 to 15 any one of them touch device.
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