CN108255335A - Touch-sensing device and touch-sensing system - Google Patents
Touch-sensing device and touch-sensing system Download PDFInfo
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- CN108255335A CN108255335A CN201711457309.3A CN201711457309A CN108255335A CN 108255335 A CN108255335 A CN 108255335A CN 201711457309 A CN201711457309 A CN 201711457309A CN 108255335 A CN108255335 A CN 108255335A
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- touch
- sensing
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- drive
- signal
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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
- G06F3/04182—Filtering of noise external to the device and not generated by digitiser components
-
- 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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04101—2.5D-digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface and also measures the distance of the input means within a short range in the Z direction, possibly with a separate measurement setup
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04104—Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
Abstract
This disclosure relates to a kind of touch-sensing device and touch-sensing system.Touch-sensing device includes：Driving part is configured within the touch-sensing time that multiple drive signals are supplied to multiple driving electrodes simultaneously, and the touch-sensing time is divided into multiple periods；And sensing part, it is configured to receive in each period from sensing electrode and multiple driving electrodes is coupled in multiple positions for the response signal of multiple drive signals, sensing electrode；From response signal extraction corresponding to multiple channel response signals of multiple drive signals；And sense touch or the degree of approach of the exterior object for multiple positions by demodulating the multiple channel response signal, the drive waveforms of plurality of drive signal are formed as different from each other within the same period, and the drive waveforms of each in drive signal change in each period within the touch-sensing time.The influence of noise can be preferably minimized by touch-sensing device while more drivings are implemented.
Description
Cross reference to related applications
The application asks the preferential of the South Korea patent application submitted on December 28th, 2016 the 10-2016-0180749th
Power, the patent application are incorporated by reference for all purposes herein, as complete elaboration herein.
Technical field
The embodiments described herein is related to a kind of for sensing touch or the degree of approach of the exterior object for panel
Touch-sensing device and touch-sensing system.
Background technology
A kind of technology for identifying the exterior object for approaching or touching touch panel is referred to as touch-sensing technology.
Touch panel is placed at position identical with display panel in the plane, enabled a user to aobvious in viewing
Show and user's operation signal is input to touch panel during the image on panel.
Compared with the input method (for example, mouse input method or inputting method) of other previous user input signals, this
Class user's operation signal generating method provides fabulous user's intuitive.
According to this advantage, touch-sensing technology is applied in the various electronic devices comprising display panel.
Meanwhile drive signal can be supplied to the driving electrodes being arranged on touch panel by touch-sensing device, and can
To receive the reaction signal formed in sensing electrode, touch or the degree of approach of the exterior object for touch panel are thus sensed.
Touch-sensing device can be by alternately output high pressure (for example, driving high pressure VDD) and low pressure (for example, driving is low
Pressure VSS) mode generate drive signal.In addition, resulting drive signal has pulsewidth modulation (Pulse Width
Modulation, PWM) waveform, and can have specific driving frequency.
However, in some cases, the driving frequency for being applied to drive signal may be by the extreme influence of noise.It lifts
For example, when driving frequency is identical with the switching frequency of switching circuit, drive signal may be influenced by switching noise.
Although making many effort so that the influence of this noise like is preferably minimized to properly selecting driving frequency,
In view of all unexpected noises, driving frequency is selected to be not easy to.
Invention content
In this context, the one side of this embodiment is to provide a kind of touch for being preferably minimized the influence of noise
Detection technology.
This embodiment high touches touching for susceptibility further aspect is that provide a kind of noise frequency and how all to have
Touch detection technology.
This embodiment further aspect is that providing a kind of can be preferably minimized the influence of noise while more driving
Touch-sensing technology.
In view of above-mentioned aspect, an embodiment provides a kind of touch-sensing device comprising driving part and sensing part.
In one embodiment, multiple drive signals can be supplied to multiple by driving part simultaneously within the touch-sensing time
Driving electrodes, the touch-sensing time are divided into multiple periods.
The response of multiple drive signals is believed in addition, sensing part can be received from sensing electrode in each period
Number, and multiple channel response signals corresponding to multiple drive signals can be extracted from response signal, the sensing electrode is more
It is coupled to multiple driving electrodes in a position.In addition, sensing part can be by demodulating object outside multiple channel response signal sensings
Touch of the body for multiple positions.
The drive waveforms of multiple drive signals are formed into different from each other within the same period, and the drive signal
In the drive waveforms of each can change within each period in the touch-sensing time.
Multiple drive signals can have different driving frequency within the same period, and sensing part can be by that will have
There are multiple demodulated signals with each identical frequency in drive signal to be applied to response signal and rung to extract multiple channels
Induction signal.
Sensing part can demodulate the channel response signal of each in drive signal to generate by each period
A plurality of sensing data, and can be outer to sense by handling a plurality of sensing data of each in drive signal with statistical
Touch of portion's object for multiple positions.
When multiple drive signals have different driving frequencies within the same period, sensing part can be by sound
Induction signal performs Fourier transformation (Fourier-transfom) to extract multiple channel response signals.
Multiple drive signals can be supplied to N number of driving electrodes (N the is 2 or natural number more than 2) by driving part simultaneously.
At this point, the touch-sensing time can be divided into N number of period.
Another embodiment provides a kind of touch-sensing system, includes panel, driving part and sensing part.
In another embodiment, in the panel, multiple driving electrodes can be set and multiple sensing electrodes can be arranged to
It is coupled to driving electrodes with electrostatic capacitance.
In addition, multiple drive signals can be supplied to a driving being made of N number of driving electrodes by driving part simultaneously
Electrode group (N the is 2 or natural number more than 2).
In addition, sensing part can receive the response signal of multiple drive signals, and signal according to response from sensing electrode
Sense touch of the exterior object for panel.
In addition, the drive waveforms of multiple drive signals change, and in each period in multiple periods same
The drive waveforms of respective drive electrode are supplied in period can be formed as different from each other.
When each in drive waveforms is sine wave, driving part may include being configured to the inquiry of storage sinusoidal data
Table and the digital analog converter for being configured to generate sine wave according to sinusoidal wave data.
Driving part may include the code generator for being configured to generate the different code for N number of driving electrodes and configuration
Into the waveform synthesizer for generating the drive waveforms with the driving frequency corresponding to code.
Sensing part can obtain the information about driving frequency from driving part, and can use about driving frequency
Information demodulates response signal.
Code generator can generate code according to pseudo random number (PN) sequence.
As described above, according to the embodiments described herein, influence of the noise in touch-sensing can be dropped
To minimum.In addition, according to this embodiment, regardless of noise frequency, it can will touch susceptibility and maintain higher.In addition,
According to the embodiments described herein, drive can be performed while influence of the noise in touch-sensing is preferably minimized more
It is dynamic.
Description of the drawings
Above-mentioned and other aspects, the feature and advantage of the disclosure will more by the detailed description carried out below in conjunction with attached drawing
Add it is clear that wherein：
Fig. 1 is the configuration diagram of display device according to the embodiment.
Fig. 2 is the schematic diagram for schematically illustrating the touch-sensing system according to an embodiment.
Fig. 3 is the schematic diagram for illustrating to be supplied to the drive waveforms of the drive signal of driving electrodes in one embodiment.
Fig. 4 is the schematic diagram for schematically showing touch drive system according to another embodiment.
Fig. 5 is the schematic diagram for illustrating to be supplied to the drive waveforms of the drive signal of driving electrodes in another embodiment.
Fig. 6 is frequency spectrum of multiple drive signals in first time period and second time period illustrated in another embodiment
Schematic diagram.
Fig. 7 is to illustrate showing for frequency spectrum of the response signal in first time period and second time period in another embodiment
It is intended to.
Fig. 8 is the schematic diagram for the inside configuration for illustrating sensing part according to another embodiment.
Fig. 9 is the schematic diagram for the first exemplary configuration for illustrating Multiple Channel Analysis component (channel analysis part).
Figure 10 is the schematic diagram for the second exemplary configuration for illustrating Multiple Channel Analysis component.
Figure 11 is the schematic diagram for the third exemplary configuration for illustrating Multiple Channel Analysis component.
Figure 12 is the schematic diagram for the exemplary drive waveforms for illustrating drive signal.
Figure 13 is the schematic diagram for the configuration for illustrating touch-sensing system according to another embodiment.
Figure 14 is the schematic diagram for illustrating wherein driving frequency state of frequency hopping in drive signal.
Drawing reference numeral explanation
10：Object；
100：Display device；
102：Display panel；
110：Touch panel；
120：Data drive circuit；
130：Gate driving circuit；
140：Touch-sensing circuit；
200：Touch-sensing system；
210、1310：Driving part；
220、1320：Sensing part；
230、1330：Control unit；
310、320、330、340、350：Drive waveforms；810：Front end component；
820、820a、820b、820e：Multiple Channel Analysis component；
830：Data generating components；
910、1040、1110：A/D converter；
920：Buffer；
930、1010：Frequency mixer；
940、1020：Demodulated signal generator；
950、1030：Wave filter；
960、1050、1140：Channel data generator；
1120：Fourier transformation component；
1130：Frequency mapping department part；
1300：Touch-sensing system；
1312：Code generator；
1314：Frequency meter；
1316：Waveform synthesizer；
DL：Data line；
f1、f2、f3、f4、f5：Driving frequency；
F1 to fn：First frequency is to the n-th frequency；
GL：Gate line；
GIP：Panel grid；
GR1、GR2…GRm：Driving electrodes group
RXE：Sensing electrode；
CH_DATA：Channel senses data；
CH_DEM：Channel correlation demodulation signal；
CH_SRX、CH_SRX1、CH_SRX2、CH_SRX3、CH_SRX4、CH_SRX5：Channel response signal；
F_DATA：Channel associated drives frequency information；
SRX、SRX’(t)、DSRX’：Response signal
STX、STX1、STX2、STX3、STX4、STX5、STXn：Drive signal；
SRX_A：First exemplary drive signal；
SRX_B：Second exemplary drive signal；
SRX_C：Third demonstration drive signal；
T1、T2、T3、T4、T5：Period/the first is to the 5th period
TXE、TXE1、TXE2、TXE3、TXE4、TXE5：Driving electrodes；
T：The touch-sensing time.
Specific embodiment
Hereinafter, it will refer to attached drawing detailed description of the present invention embodiment.It is each attached reference label is added to
During element in figure, in the conceived case, similar elements are although show also be ordered by same reference numerals in different figures
Name.In addition, in being described below of the disclosure, when the detailed description to known function and configuration for determining to be incorporated herein may
When making the theme of the disclosure unintelligible instead, the description will be omitted.
In addition, in the component for describing the disclosure, it can be used herein such as first, second, A, B, (a), (b)
Term.These terms only to distinguish a structural detail and other structures element, and the characteristic of counter structure element, order,
Sequence etc. is not limited by the term.It should be noted that if a component " connection ", " coupling " or " engagement " is described in the description
To another component, then third component " can connect ", " coupling " and " engagement " are between first assembly and the second component, but
First assembly can be directly connected to, couple or be joined to the second component.
Fig. 1 is the configuration diagram of display device according to the embodiment.
With reference to figure 1, display device 100 can include display panel 102, touch panel 110, data drive circuit 120, grid
Pole driving circuit 130, touch-sensing circuit 140 etc..
In display panel 102, the multiple data line DL for being connected to data drive circuit 120 can be formed, and can be with shape
Into the multiple gate lines G L for being connected to gate driving circuit 130.In addition, corresponding to multiple data line DL's and multiple gate lines G L
Multiple pixels in crosspoint can be limited in display panel 102.
Each in such pixel can be connected to data line by wherein first electrode (for example, source electrode or drain electrode)
DL, gate electrode are connected to gate lines G L and second electrode (for example, drain electrode or source electrode) is connected to the crystalline substance of show electrode
Body pipe is formed.
Touch panel 110 can be placed on display panel 102 and multiple driving electrodes TXE and multiple sensing electrode RXE
It can be arranged on touch panel 110.
Display panel 102 and touch panel 110 can share some components.For example, multiple driving electrodes TXE or more
A sensing electrode RXE can be the component (for example, applying the common electrode of common voltage) of display panel 102.In view of display surface
The fact that some components of plate 102 and touch panel 110 are mutually shared, such panel is also referred to as integrated panel.
Meanwhile display panel 102 and touch panel 110 may be positioned so that and be separated from each other.For example, panel may so that
The mode that the touch panel 110 formed according to self-contained process is attached on display panel 102 is obtained to manufacture.It is referred to as addition type
Panel is the example of this kind of panel.
Data-signal is supplied to data line DL to be shown in each pixel of display panel 102 by data drive circuit 120
Show digital picture.
Data drive circuit 120 can include at least one data driver integrated circuit (Integrated Circuit,
IC).At least one data driver IC can engage (Tape Automated Bonding, TAB) side automatically by coil type
The joint sheet or can directly be formed that method or glass flip chip (Chip On Glass, COG) method are connected in display panel 102
In on display panel 102.In some cases, data driver IC can be formed by being integrated on display panel 102.Separately
Outside, data drive circuit 120 can be implemented by chip on film (Chip-On Film, COF) mode.
Scanning signal can be sequentially supplied to gate lines G L by gate driving circuit 130, be located at often to open or close
Transistor in a pixel.
As illustrated in Figure 1, depending on driving method, gate driving circuit 130 can be located at the side of display panel 102
On or be segmented into two parts to be located on the opposite side of display panel 102.
In addition, gate driving circuit 130 can include at least one gate drivers IC, at least one gate driving
Device IC can be connected to the joint sheet in display panel 102 by TAB methods or COG methods or can be by with panel grid
Driving (Gate-In-Panel, GIP) type is implemented and is formed directly on display panel 102.In some cases, grid drives
Dynamic device IC can be formed by being integrated on display panel 102.In addition, gate driving circuit 130 is also possible to the reality in a manner of COF
It applies.
Drive signal can be supplied to driving electrodes TXE and can be received from sensing electrode RXE by touch-sensing circuit 140
The response signal of drive signal.In addition, touch-sensing circuit 140 can according to response signal come sense exterior object for touch
The touch of panel 110 or the degree of approach.
As illustrated in Figure 1, touch-sensing circuit 140 is respectively from data drive circuit 120 and gate driving circuit 130
The configuration of offer.Although touch-sensing circuit 140 can be provided in the outer of data drive circuit 120 and gate driving circuit 130
Portion, but touch-sensing circuit 140 can depend on embodiment and be embodied as comprising data drive circuit 120 and gate driving electricity
The inside configuration of another Standalone Drives IC at least one of road 130.Alternatively, touch-sensing circuit 140 can be implemented
Internal structure for data drive circuit 120 or gate driving circuit 130.
Therefore, when drive signal is supplied to driving electrodes TXE by touch-sensing circuit 140, it is believed that include touch
Drive signal is supplied to driving electrodes TXE by the Standalone Drives IC of sensing circuit 140.In addition, depending on designing scheme, may be used also
To think drive signal is supplied to drive comprising the data drive circuit 120 or gate driving circuit 130 that touch driving circuit 140
Moving electrode TXE.
Touch-sensing circuit 140 is not limited to embodiment and designing scheme, and itself can be configured to another configuration or can match
It puts inside or outside another configuration, as long as its performance function and performance function described herein are same or like.
Although Fig. 1 illustrates that a touch-sensing circuit 140 is placed in display device 100, display device 100 may include
Two or more touch-sensing circuits 140.
Meanwhile capacitive touch method, the wherein touch of exterior object or the degree of approach may be used in display device 100
It is identified by detecting by the variation of the electrostatic capacitance of sensing electrode RXE.
This kind of capacitive touch method is segmented into, for example, mutually capacitive touch method and from electrostatic capacitance
Formula touch method.
Mutual capacitive touch method (it is a type of capacitive touch method) can be by drive signal
It is supplied to driving electrodes TXE and response signal can be received from the sensing electrode RXE for being coupled to the driving electrodes TXE, thus
Sense the touch for touch panel 110 or the degree of approach.In mutual capacitive touch method, sensed by sensing electrode RXE
To value depend on the touch of object or the degree of approach such as finger or pen and change.Mutual capacitive touch method use feeling
Survey that the sensing value detection of electrode RXE touches in the presence/absence of, touch coordinate etc..
Drive signal is supplied from capacitive touch method (it is another type of capacitive touch method)
Driving electrodes TXE should be arrived and then sense the driving electrodes TXE again.From in capacitive touch method, not area
Divide driving electrodes TXE and sensing electrode RXE.From in capacitive touch method, taken by the driving electrodes TXE values sensed
Certainly change in touch or the degree of approach of the objects such as such as finger or pen.Sensing electrode is used from capacitive touch method
The sensing value detection of RXE touch in the presence/absence of, touch coordinate etc..
Two kinds of capacitive touch methods as described above may be used in display device 100, and (mutual electrostatic capacitive touches
Touch method and from capacitive touch method) in one kind.Herein, for the convenience of explanation, will assuming that using
Embodiment is described in the case of mutual capacitive touch method.
Fig. 2 is the schematic diagram for schematically illustrating the touch-sensing system according to an embodiment, and Fig. 3 is to illustrate to implement one
The schematic diagram of the drive waveforms of the drive signal of driving electrodes is supplied in example.
With reference to figure 2, touch-sensing system 200 may include touch panel 110 and touch-sensing circuit 140.
Multiple driving electrodes TXE can be arranged on touch panel 110, and are coupled to the sensing of multiple driving electrodes TXE
Electrode RXE can be arranged at multiple positions.
Touch-sensing circuit 140 may include driving part 210 and sensing part 220, and can further include control driving
The control unit 230 of component 210 and sensing part 220.
Drive signal STX can be supplied to driving electrodes TXE by driving part 210.
With reference to figure 3, drive signal STX can have drive waveforms 310 to 350, and the drive waveforms are in multiple periods
It is variable in each time interval in T1 to T5.For example, drive signal STX can have first in first time period T1
Drive waveforms 310, and there are the second drive waveforms 320 for being different from the first drive waveforms 310 in second time period T2, it is described
Second time period and first time period T1 are continuous.
Touch-sensing time T can be referred to as the sensing time of a position.Touch-sensing circuit 140 can sense
All positions of touch panel 110, while touch-sensing time T is assigned to each in multiple positions.One position
Touch-sensing time T can be with frame time unit duplicate allocation.
Touch-sensing time T is divided into multiple period T1 to T5, and drive waveforms 310 to 350 are in period T1 to T5
It is interior can be different from each other.For example, the second driving of the first drive waveforms 310 of first time period T1, second time period T2
Waveform 320, the third drive waveforms 330 of third period T3, the 4th period T4 the 4th drive waveforms 340 and the 5th when
Between the 5th drive waveforms 350 of section T5 can be different from each other.
The driving frequency of drive waveforms can be different in each period.For example, first in first time period T1
The driving frequency of the second drive waveforms 320 in the driving frequency and second time period T2 of drive waveforms 310 can be different from each other,
The second time period and first time period T1 are continuous.Driving frequency can be different from each other in all period T1 to T5.
When drive signal STX is used to drive driving electrodes TXE, can obtain and when sensing touch under the conditions of multiple and different
The identical effect of the effect of acquisition, the drive waveforms of the drive signal are in each period in multiple period T1 to T5
It is different.For example, when using in five period T1 to T5, there are five the drive signal STX driving drivings of driving frequency for tool
During electrode TXE, the identical effect of the effect that is obtained when can obtain with being touched with five different driving frequencies sensing.Therefore, even if
Some driving frequencies are easily affected by noise, but can accurately sense the touch with the drive waveforms corresponding to remaining driving frequency.
Meanwhile sensing part 220 can receive the response signal SRX of drive signal STX from sensing electrode RXE, and can be with
Signal SRX senses touch or the degree of approach of the object 10 for touch panel 110 according to response.
Sensing part 220 can generate sensing data within each period.Sensing data may include in demodulation response letter
Number when the sensing value that generates.Sensing value can be the time integral value (time of the current or voltage of such as response signal
integration value).Alternatively, sensing value can be such as response signal frequency component amplitude (amplitude) or according to
The calculated value that frequency component amplitude determines.Sensing value can be used for determining whether object 10 contacts touch panel 110 or to generate
Touch coordinate.For example, when the amplitude of sensing value is more than or less than reference value, it may be determined that touching for object 10 has occurred
It touches.
Sensing part 220 can demodulate response signal SRX in different ways according to the drive waveforms in each period.It lifts
For example, when the driving frequency in drive signal STX changes within each period, sensing part 220, which can generate, to be had
The demodulated signal of the frequency identical with the driving frequency corresponding to each period, and can be by the way that demodulated signal is applied to sound
Induction signal SRX demodulates response signal SRX.Sensing part 220 can be demodulated by handling demodulated signal and response signal SRX
The phase of response signal SRX, the demodulated signal and the response signal is synchronized with each other, by this method so that demodulated signal and sound
Induction signal SRX doubles in terms of signal.
Meanwhile sensing part 220 generates sensing data and by all using for each time for each period
The a plurality of sensing data that section generates sense touch or the degree of approach of the object 10 for touch panel 110.
Sensing part 220 may handle a plurality of sensing data to sense object 10 for touch panel with statistical
110 touch or the degree of approach.For example, sensing part 220 can pass through a plurality of sense to being generated in touch-sensing time T
The multiple sensing values included in measured data are averaging the final sensing value to determine touch-sensing time T, and can use final
Sensing value senses touch or the degree of approach.Sensing part 220 a plurality of can will be sensed in the multiple sensing values included in data
Between value be determined as the final sensing value of touch-sensing time T.Alternatively, sensing part 220 can will be by a plurality of sensing number
Remaining sensing value in addition to maximum value and minimum value in the multiple sensing values included in is averaging the value obtained and determines
Final sensing value for touch-sensing time T.
Meanwhile touch-sensing circuit 140 can be implemented by the way that drive signal STX is supplied to multiple driving electrodes simultaneously
More drivings.
Fig. 4 is the schematic diagram for schematically showing touch drive system according to another embodiment.
With reference to figure 4, multiple driving electrodes TXE can be arranged on touch panel 110, and are coupled to multiple driving electrodes
The sensing electrode RXE of TXE can be arranged at multiple positions.
Multiple drive signal STX1 to STX5 can be supplied to multiple drives by driving part 210 simultaneously in the touch-sensing time
Moving electrode TXE1 to TXE5.
Sensing part 220 can receive the response signal SRX of multiple drive signal STX1 to STX5 from sensing electrode RXE,
And touch or the degree of approach of the object 10 for touch panel 110 can be sensed by signal SRX according to response.
Fig. 5 is the schematic diagram for illustrating to be supplied to the drive waveforms of the drive signal of driving electrodes in another embodiment.
With reference to figure 5, the drive waveforms of multiple drive signal STX1 to STX5 can be in multiple times of touch-sensing time
Section T1 to T5 in each period in change, and drive waveforms be formed as it is different from each other within the same period.Citing comes
It says, the drive waveforms of the first drive signal STX1 change in each period in multiple period T1 to T5.Exactly,
The driving frequency of first drive signal STX1 changes in each period in multiple period T1 to T5.In addition, first
In period T1, the drive waveforms of multiple drive signal STX1 to STX5 of formation are different from each other.Exactly, at the first time
In section T1, the driving frequency of multiple drive signal STX1 to STX5 is different from each other.
Fig. 6 is frequency spectrum of multiple drive signals in first time period and second time period illustrated in another embodiment
Schematic diagram.
With reference to figure 6, in first time period T1 and second time period T2, multiple drive signal STX1 to STX5 have difference
Driving frequency f1 to f5.
In addition, when first time period T1 becomes second time period T2, the driving frequency of respective drive signal STX1 to STX5
Rate changes.For example, the driving frequency of the first drive signal STX1 becomes the second driving frequency f2 from the first driving frequency f1.
Since drive waveforms are different within each period, touch-sensing system can such as refer to while sensing and touching
It is preferably minimized the influence of noise described by Fig. 2 and Fig. 3.
Meanwhile touch-sensing system can be multiple with different driving frequency f1 to f5 within the same period by making
Drive signal STX1 to STX5 drives more to perform.For example, drive signal can be supplied to by touch-sensing system simultaneously
Multiple driving electrodes are to sense touch or the degree of approach of the object for multiple positions.
Since multiple drive signal STX1 to STX5 are supplied to multiple driving electrodes simultaneously, it is coupled to multiple driving electrodes
Sensing electrode influenced by all drive signal STX1 to STX5.Incidentally, due to multiple drive signal STX1 to STX5
With different driving frequency f1 to f5, can be arrived by analyzing the frequency component of response signal to distinguish respective drive signal STX1
The channel response signal of STX5.
Fig. 7 is to illustrate showing for frequency spectrum of the response signal in first time period and second time period in another embodiment
It is intended to.
When the frequency for analyzing response signal, can determine as illustrated in figure 7 corresponding to respective drive frequency f1 to f5's
The amplitude of component.For example, in first time period T1, the amplitude of the component of the first driving frequency f1 is small and remaining drives frequency
The amplitude of the component of rate f2, f3, f4 and f5 is big.
When occur object touch or it is close when, the size of component becomes smaller.With reference to figure 7, the touch or close of object is determined
It is happened near the crosspoint of driving electrodes and sensing electrode, to the driving electrodes and sensing electrode in first time period T1
It is supplied with the drive signal with the first driving frequency f1.
With reference to Fig. 6 and Fig. 7, in first time period T1, the first drive signal STX1 has the first driving frequency f1.
Accordingly, it is determined that the touch of object or close to being happened near the crosspoint of driving electrodes and sensing electrode, the driving electrodes and
The sensing electrode is supplied with the first drive signal STX1.
In second time period T2, the amplitude of the component of the second driving frequency f2 is small.In second time period T2, first drives
Dynamic signal STX1 has the second driving frequency f2.Accordingly, it is determined that touch or the close friendship for being happened at driving electrodes and sensing electrode
Near crunode, the driving electrodes and the sensing electrode are supplied with the first drive signal STX1.
In touch-sensing system according to another embodiment of the present invention, the drive waveforms of multiple drive signals are identical
It is different from each other in period, so that performing drive more.
Fig. 8 is the schematic diagram for the inside configuration for illustrating sensing part according to another embodiment.
With reference to figure 8, sensing part 220 may include front end component 810, Multiple Channel Analysis component 820, data generation components 830
Deng.
Front end component 810 may include amplifier (not shown).In addition, front end component 810 (can not be shown using amplifier
Go out) the response signal SRX received from sensing electrode RXE is amplified.
The response signal SRX handled by front end component 810 can be for transmission to Multiple Channel Analysis component 820.Multiple Channel Analysis component
820 can extract multiple channel response signals corresponding to respective drive signal from pretreated response signal SRX ' (t).It lifts
For example, when supplying N number of drive signal simultaneously, Multiple Channel Analysis component 820 can be from pretreated response signal SRX ' (t)
Extract N number of channel response signal.Channel response signal can be for example corresponding to the frequency spectrum with reference to 7 described response signal of figure
In respective drive frequency frequency component signal.
Multiple Channel Analysis component 820 can generate a plurality of channel sensing data CH_ by demodulating multiple channel response signals
DATA.In addition, data generation components 830 can sense data CH_DATA to sense object for touch surface using a plurality of channel
The touch of multiple positions on plate or the degree of approach.
Meanwhile Multiple Channel Analysis component 820 can generate channel response signal or channel sensing number with hardware or software mode
According to.
Fig. 9 to Figure 11 illustrates the exemplary configuration that can be applied to Multiple Channel Analysis component according to another embodiment.
Fig. 9 is the schematic diagram for the first exemplary configuration for illustrating Multiple Channel Analysis component.
With reference to figure 9, Multiple Channel Analysis component 820a may include A/D converter 910, buffer 920, frequency mixer 930, demodulation
Signal generator 940, wave filter 950 and channel data generator 960 etc..
Pretreated response signal SRX ' (t) can be converted to digital signal and can be by number by A/D converter 910
Word signal is stored in buffer 920.
In addition, the response signal DSRX ' being stored in buffer 920 is multiplied by channel correlation demodulation signal by frequency mixer 930
CH_DEM by response signal DSRX ' to be converted into channel response signal CH_SRX.
It, can be by that will have and application when the drive signal for being supplied to respective drive electrode has different driving frequency
Demodulated signal CH_DEM to the same or similar frequency of driving frequency of each drive signal is applied to response signal and extracts
Channel response signal CH_SRX.
Demodulated signal generator 940 can generate demodulated signal CH_DEM (this according to the different driving frequency of each channel
Place, channel can be understood as identical with driving electrodes).Demodulated signal generator 940 can generate each channel according to preset value
Demodulated signal CH_DEM.In addition, demodulated signal generator 940 can receive the drive about each channel from driving part 210
The information (for example, channel associated drives frequency information F_DATA) of dynamic signal, and each channel can be generated using described information
Channel correlation demodulation signal CH_DEM.
Can noise be removed from channel response signal CH_SRX by wave filter 950 (for example, low-pass filter).
In addition, channel data generator 960 can use the channel response signal CH_SRX for eliminating noise to generate channel
Sense data CH_DATA.Channel sensing data CH_DATA can have such as amplitude of channel response signal CH_SRX or pass through
The value that predetermined time is reached to channel response signal CH_SRX integrations and is obtained.
Since the drive waveforms of drive signal change within each period, Multiple Channel Analysis component 820a can generate each
The channel of period and each channel sensing data CH_DATA.
Figure 10 is the schematic diagram for the second exemplary configuration for illustrating Multiple Channel Analysis component.
With reference to figure 10, Multiple Channel Analysis component 820b may include frequency mixer 1010, demodulated signal generator 1020, wave filter
1030th, A/D converter 1040 and channel data generator 1050 etc..
Pretreated response signal SRX ' (t) and demodulated signal CH_DEM1 to the CH_ corresponding to respective channel generated
DEM5 is combined, while multiple channel response signal CH_SRX1 are converted in the multiple frequency mixers 1010 provided for respective channel
To CH_SRX5.
In addition, noise is removed by wave filter 1030 from channel response signal CH_SRX1 to CH_SRX5 and channel response signal
CH_SRX1 to CH_SRX5 is converted into digital signal by analog-digital converter 1040.In addition, channel data generator 1050 makes
Channel sensing data CH_DATA is generated with the channel response signal for being converted into digital signal.Channel sensing data CH_DATA can be with
With such as amplitude of channel response signal CH_SRX or by being obtained to channel response signal CH_SRX integrations up to the predetermined time
The value obtained.
Since the drive waveforms of drive signal change within each period, Multiple Channel Analysis component 820b can generate about
The channel of each period and each channel sensing data CH_DATA.
Figure 11 is the schematic diagram for the third exemplary configuration for illustrating Multiple Channel Analysis component.
With reference to 11, Multiple Channel Analysis component 820c may include A/D converter 1110, Fourier transformation component 1120, frequency
Mapping means 1130 and channel data generator 1140.
Pretreated response signal SRX ' (t) can be converted into digital signal DSRX ' by A/D converter 1110.
Fourier transformation component 1120 can perform fast Fourier to the response signal DSRX ' for converted digital signal
It converts (Fast Fourier Transform, FFT), to generate frequency component data FFT_SRX '.Each frequency component
Amplitude (amplitude) can be contained in frequency component data FFT_SRX '.
In addition, frequency mapping department part 1130, which can use, corresponds to the driving frequency in frequency component data FFT_SRX '
Frequency component extracts channel response signal CH_SRX.Frequency mapping department part 1130 can prestore the letter about driving frequency
Breath, and the driving frequency of each channel can be determined by receiving the information from driving part.
Channel data generator 1140 generates channel sensing data CH_DATA using channel response signal.Channel senses
Data CH_DATA can have such as amplitude of channel response signal CH_SRX or by being integrated to channel response signal CH_SRX
The value obtained up to the predetermined time.
Since the drive waveforms of drive signal change within each period, Multiple Channel Analysis component 820c can generate about
The channel of each period and each channel sensing data CH_DATA.
Referring again to FIGS. 8, data generation components 830 can receive channel sensing data CH_DATA, and it can be each letter
Road generate indicator body touch or close to (for example, touch in the presence/absence of, touch coordinate etc.) touch information (about
Each position corresponding to each channel or each position to intersect each other about driving electrodes and sensing electrode).At this point, data
Generating unit 830 can by be fully used in a plurality of channel received in each period sense data (CH_DATA) come
Generate touch information.
Although describing three exemplary channel analysis components with reference to figure 9 to Figure 11, but the present disclosure is not limited thereto.It can be with
Other technologies that can analyze frequency component are applied to Multiple Channel Analysis component.It for example, can also will be from addition to FFT
Dissipate Fast Fourier Transform (FFT) (Discrete Fast Fourier Transform, DFFT), Goerzel algorithm (Goertzel
) and coordinate rotation digital computer (COordinate Rotation DIgital Computer, CORDIC) algorithm
Algorithm is applied to Multiple Channel Analysis component.
Meanwhile in drive signal, drive waveforms can have variously-shaped.For example, drive waveforms can have
Trapezoidal waveform, PWM waveform or sinusoidal waveform.
Figure 12 is the schematic diagram for the exemplary drive waveforms for illustrating drive signal.
With reference to figure 12, drive signal can have the trapezoidal waveform for being similar to the first exemplary drive signal SRX_A, wherein
Rising edge edge and trailing edge in the trapezoidal waveform is along with constant gradient.First exemplary drive signal SRX_A's
The advantages of trapezoidal waveform, is, since rising edge edge and trailing edge edge have constant inclination degree, makes an uproar so generating less high frequency
Sound.
Drive signal can have the PWM waveform for being similar to the second exemplary drive signal SRX_B.In the feelings of PWM waveform
Under condition, due to generating PWM waveform in selective output HIGH voltage and low-voltage, so with can easily generate driving letter
Number the advantages of.
Drive signal can be analogous to the sine wave of third demonstration drive signal SRX_C.In the case of sine wave,
Have the advantages that generate less harmonic component.
To generate the drive signal with sine wave, driving part can include to store looking into for sinusoidal data in inside
Look for table and the digital analog converter for generating sine wave from sinusoidal wave data.
Although being not shown, drive signal can have the waveform of another shape.For example, drive signal can have
The waveform of triangular wave.All waveforms with variable frequency can be applied to drive signal.
Figure 13 is the schematic diagram for the configuration for illustrating touch-sensing system according to another embodiment.
With reference to figure 13, touch-sensing system 1300 may include panel 110, is provided with multiple driving electrodes TXE and sets
It is equipped with the multiple sensing electrode RXE for being coupled to driving electrodes TXE with electrostatic capacitance.
The driving electrodes TXE being arranged in touch panel 110 may be grouped in a manner that each group comprising N number of driving electrodes
(N the is 2 or natural number more than 2).It is grouped according to this, M driving electrodes group GR1, GR2 ... and GRm can be formed in
On panel 110 (M be 2 or the natural number more than 2).Although N number of driving electrodes TXE may be embodied in driving electrodes group GR1,
GR2 ... and in each in GRm, but some driving electrodes groups, such as most external driving electrodes group GRm may include driving
Moving electrode TXE, number are less than N.
Touch-sensing system 1300 may include simultaneously by multiple drive signal STX1, STX2 ... and STXn is supplied to N
The driving part 1310 of a driving electrodes TXE, the driving electrodes form a driving electrodes group.
Drive signal STX1, STX2 ... and the drive waveforms of STXn are in each period in multiple periods
It can change, and drive waveforms can be different from each other within the same period.
Driving part 1310 can be supplied during N number of period drive signal STX1, STX2 ... and STXn, institute
The number for stating drive signal is equal to the number of driving electrodes TXE, and the driving electrodes form a driving electrodes group.
Driving part 1310 can be sequentially driven multiple driving electrodes TXE by driving electrodes group.For example, driving portion
Part 1310 can drive driving electrodes group in the following manner：Driving electrodes group is by the first driving electrodes group GR1, the second driving electrodes
Group GR2 ... and the order of M driving electrodes groups GRm is sequentially driven, and drives the driving in each driving electrodes group simultaneously
Electrode.
Touch-sensing system 1300 may include sensing part 1320 and control unit 1330.
Control unit 1330 can perform whole control in touch-sensing system 1300.
In addition, sensing part 1320 can receive the response letter of multiple drive signal STX1 to STX5 from sensing electrode RXE
Number SRX, and touch or the degree of approach of the exterior object for touch panel 110 can be sensed according to the response signal SRX.
Meanwhile driving part 1310 can include code generator 1312, frequency meter 1314 and Waveform composition in inside
Device 1316.
Code generator 1312 generates the code to be applied to N number of driving electrodes TXE, and the driving electrodes form driving electricity
Pole group.Code generator 1312 can be that N number of driving electrodes TXE generates N number of different code.
Frequency meter 1314 will be transferred to about the information of the code generated in code generator 1312.Frequency meter 1314 can
To store the drive frequency information corresponding to each code.The code that frequency meter 1314 can be generated according to code generator 1312
It determines driving frequency and drive frequency information can be transferred to waveform synthesizer 1316.
In addition, waveform synthesizer 1316 can generate the drive waveforms with the driving frequency corresponding to code, and can be with
Drive waveforms are supplied to driving electrodes TXE.
Code generator 1312 can occur in the code changed in each period.Then, waveform synthesizer 1316 can
With generate and supply drive signal STX1, STX2 ... and STXn, while according to the driving frequency received in each period
Rate information (information of driving frequency determined about the code changed according to each period) changes drive waveforms.
Code generator 1312 can generate code so that driving frequency frequency hopping.Frequency meter 1314 can store multiple generations
Code match information (match information of code and driving frequency), and code generator 1312 can use pseudo random number (PN) sequence
Generate code.
Sensing part 1320 can be obtained from driving part 1310 about through determining the information of code or about through determining to drive
The information of dynamic frequency, and the information demodulation response signal SRX about driving frequency can be used.
Figure 14 is the schematic diagram for illustrating wherein driving frequency state of frequency hopping in drive signal.
With reference to figure 14, the driving frequency applied in each period in drive signal STX can be with frequency hopping.For example,
In first time period T1, third frequency f3 may be adapted to be used as driving frequency, and in second time period T2, N frequencies fn can
It is suitable for use as driving frequency.This frequency hopping has the effect of the bandspreading of drive signal STX to broad spectrum.In addition,
This frequency hopping has the effect for the influence for being limited to the noise occurred in narrow frequency range.As a particular instance, this frequency hopping
It may be limited to the influence of the high power noise occurred in special frequency band.As another example, this frequency hopping can become the time
The influence for changing noise is preferably minimized.Depending on outside or inside factor, variable noise can occur in a short period of time, and frequency hopping
The influence of this variable noise can be limited.
The driving frequency applied in each period can be determined according to random sequence generator.For example, it is each
The driving frequency applied in period can be determined according to PN sequence generators.Alternatively, applied in each period
Driving frequency can be determined according to gold sequencer (Gold sequence generator).
It has been described above in accordance with an embodiment of the present disclosure.According to these embodiments, the influence of the noise in touch-sensing can
To be preferably minimized.According to these embodiments, regardless of noise frequency, it can will touch susceptibility and maintain higher.According to
These embodiments can perform drive more while the influence of the noise in touch-sensing is preferably minimized.
In addition, since such as terms such as "comprising", " comprising " and " having " mean that there may be one or more correspondences
Component, unless being specifically described as opposite situation, otherwise it should be interpreted to can include one or more of other components.As skill
All terms of art, science or other terms are consistent with the meaning that those skilled in the art is understood, unless defined otherwise.
If the general term seen in dictionary should be explained in the context of the relevant technologies works, excessively it should not idealize or be detached from
It is practical, unless the disclosure clearly defines it like that.
Although describing preferred embodiment of the present disclosure for illustrative purpose, those skilled in the art will be appreciated that
In the case where not departing from such as the scope of the present disclosure disclosed in the accompanying claims and spirit, various modifications are added and are replaced
It is all possible for changing.Therefore, disclosed embodiment is expected the range for illustrating the technical concept of the disclosure, and this public affairs in the disclosure
The range opened is not limited by such embodiments.It should be based on appended claims by included in being equivalent in the scope of the claims
All technical concepts belong to this mode of the disclosure to explain the scope of the present invention.
Claims (10)
1. a kind of touch-sensing device, including：
Driving part is configured within the touch-sensing time that multiple drive signals are supplied to multiple driving electrodes simultaneously, described
The touch-sensing time is divided into multiple periods；And
Sensing part is configured to：It is received in each period for the response signal of the multiple drive signal from sensing electrode,
The sensing electrode is coupled to the multiple driving electrodes in multiple positions；Correspond to from response signal extraction the multiple
Multiple channel response signals of drive signal；And by demodulate the multiple channel response signal sense exterior object for
The touch of the multiple position or the degree of approach,
The drive waveforms of wherein the multiple drive signal are formed as different from each other within the same period, and the drive signal
In the drive waveforms of each change in each period within the touch-sensing time.
2. touch-sensing device according to claim 1, wherein the multiple drive signal is within the same period
With different driving frequency and
The sensing part is by will have multiple demodulated signals with each identical frequency in the drive signal to apply
The response signal is added to extract the multiple channel response signal.
3. touch-sensing device according to claim 1, wherein the sensing part passes through described in the demodulation of each period
The channel response signal of each in drive signal generates a plurality of sensing data, and by handling each drive with statistical
The a plurality of sensing data of signal are moved to sense touch or the degree of approach of the exterior object for the multiple position.
4. touch-sensing device according to claim 1, wherein the multiple drive signal is within the same period
With different driving frequency and
The sensing part extracts the multiple channel response signal by performing Fourier transformation to the response signal.
5. touch-sensing device according to claim 1, wherein the driving part is simultaneously by the multiple drive signal
Be supplied to N number of driving electrodes, N be 2 or the natural number more than 2 and
The touch-sensing time is divided into N number of period.
6. a kind of touch-sensing system, including：
Panel, is provided with multiple driving electrodes and multiple sensing electrodes are arranged to be coupled to the driving electricity with electrostatic capacitance
Pole；
Driving part is configured to that multiple drive signals are supplied to a driving electrodes group being made of N number of driving electrodes simultaneously,
N is 2 or the natural number more than 2；And
Sensing part is configured to：The response signal of the multiple drive signal is received from the sensing electrode；And according to described
Response signal senses touch or the degree of approach of the exterior object for the panel,
The drive waveforms of wherein the multiple drive signal change in each period within multiple periods, and in same a period of time
Between the drive waveforms of the respective drive electrode be supplied in section be formed as different from each other.
7. touch-sensing system according to claim 6, wherein each in the drive waveforms be sine wave and
The driving part includes the look-up table for being configured to storage sinusoidal wave data and is configured to be produced according to the sinusoidal wave data
The digital analog converter of raw sine wave.
8. touch-sensing system according to claim 6, wherein the driving part includes：
Code generator, be configured to generate for N number of driving electrodes different code and
Waveform synthesizer is configured to generate the drive waveforms with the driving frequency corresponding to the code.
9. touch-sensing system according to claim 8, wherein the sensing part from the driving part obtain about
The information of the driving frequency, and demodulate the response signal using the information about the driving frequency.
10. touch-sensing system according to claim 8, wherein the code generator is generated according to pseudo-random number sequence
The code.
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| KR10-2016-0180749 | 2016-12-28 | ||
| KR1020160180749A KR20180076512A (en) | 2016-12-28 | 2016-12-28 | Touch sensing device and touch sensing system using time-varying drive signal |
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| CN108255335B CN108255335B (en) | 2023-07-04 |
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| WO2020047715A1 (en) * | 2018-09-03 | 2020-03-12 | Texas Instruments Incorporated | Touch sensor circuit |
| KR102599075B1 (en) * | 2019-05-28 | 2023-11-07 | 주식회사 엘엑스세미콘 | Apparatus and system for sensing touch or proximity of an external object |
| KR102623789B1 (en) * | 2019-10-28 | 2024-01-10 | 엘지디스플레이 주식회사 | Touch circuit, touch display device, and touch driving method thereof |
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Also Published As
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| CN108255335B (en) | 2023-07-04 |
| KR20180076512A (en) | 2018-07-06 |
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