CN107463286A - Touch sensible method, touch sensible controller and the touch induction device with the controller - Google Patents
Touch sensible method, touch sensible controller and the touch induction device with the controller Download PDFInfo
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- CN107463286A CN107463286A CN201610479938.5A CN201610479938A CN107463286A CN 107463286 A CN107463286 A CN 107463286A CN 201610479938 A CN201610479938 A CN 201610479938A CN 107463286 A CN107463286 A CN 107463286A
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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
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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
- G06F3/016—Input arrangements with force or tactile feedback as computer generated output to the user
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- User Interface Of Digital Computer (AREA)
- Position Input By Displaying (AREA)
Abstract
The invention discloses touch sensible method, touch sensible controller and the touch induction device with touch sensible controller that a kind of Frequency and Amplitude of the induced signal received based on touch panel sensor calculates touch coordinate.Touch sensible controller includes driving part and sensing part.Multiple transmission signals including drive signal and haptic signal are respectively supplied to be arranged on multiple sensors on touch panel by driving part.The induced signal that sensing part senses to sensor performs FFT (FFT) to obtain the Frequency and Amplitude of sensing signal, is then based on Frequency and Amplitude and calculates touch coordinate.Therefore, because the noise component included in induced signal and touch component are easy to be distinguished from each other, so the present invention can improve the accuracy of touch panel.Moreover, further it is supplied to sensor to make touch panel further with feeling function the haptic signal with low frequency component and the touch drive signal with high fdrequency component.
Description
Technical field
The exemplary of the present invention is related to touch sensible method, touch sensible controller and has touch sensible
The touch induction device of controller, more particularly, to the Frequency and Amplitude meter based on the sensing signal received from touch panel sensor
Calculate touch sensible method, touch sensible controller and the touch induction device with touch sensible controller of touch coordinate.
Background technology
Touch panel systems are designed to when the test shown on finger or object touch screen or the certain bits of screen
When putting, estimate the position of touch and handle specific function, without using such as keyboard, mouse input equipment.Touch panel
System is widely used in various equipment, such as cell phone, personal digital assistant, notebook computer, navigator, portable
Media player, portable game device etc..This touch panel systems have following some types, such as electric resistance touch-control panel system
System, surface acoustic wave touch panel system, infrared shielding touch panel systems, electromagnetic induction touch panel systems, and condenser type
Touch panel system.
A kind of known touchpad technology uses surface capacitance touch panel 10 as shown in Figure 1.This surface capacitance is touched
It is the conductive solids sheet material 16 that one kind is arranged on insulated substrate 18 (such as glass) to touch panel 10, and its corner is provided with sensor
12.Measuring the position of directed towards object 14 or the conventional method of the touch location on surface capacitance touch-screen 10 is led in touch panel
All four angles of electric layer 16 apply AC signals.Conductive layer 16 can be made up of tin indium oxide (ITO) etc..
In order to produce surface capacitance touch panel 10, it is full of or covers substantially homogeneous on the surface of glass substrate 18 first
Then dielectric is applied and is covered on ITO conductive materials so as to form film resistor by resistance ITO material layers.
It is to use the electric current for flowing through each angle to touch location in next step after applying AC signals on electroconductive ITO material 16
Carry out triangulation.More typically apply sine wave or rectangular wave.
When an object (such as finger 14) contacts with the surface of surface capacitance touch panel 10, on ITO surfaces 16 and refer to
A capacitor can be formed between point 14.Capacitance is very small, typically the rank in about 50pF.Therefore, it is necessary to the entrance of measurement
The electric charge or the magnitude of current at each angle 12 of panel are very small.Because electric current is so small, the system is non-to stray capacitance
It is often sensitive.Also Just because of this, the precision of surface capacitance touch panel 10 is typically problem place.
The content of the invention
In view of this, it is an object of the present invention to provide a kind of touch sensible method, this method by received from
The sensing signal of touch panel sensor carries out Fourier transformation based on the Frequency and Amplitude of sensing signal to calculate touch coordinate.
It is another object of the present invention to provide a kind of touch sensible controller for performing above-mentioned touch sensible method.
It is another object of the present invention to provide a kind of touch induction device with above-mentioned touch sensible controller.
In order to realize one object of the present invention, there is provided a kind of touch-sensing method.In this method, including driving letter
Number and multiple transmission signals of haptic signal be respectively supplied to be arranged on multiple sensors on touch panel.Then, biography is passed through
The sensing signal that sensor senses will be exaggerated.Then, digital conversion is carried out to the sensing signal of each amplification.Then, to every
Individual numeral conversion sensing signal performs FFT (FFT) to obtain the Frequency and Amplitude of the sensing signal.Then, base
Touch coordinate is calculated in Frequency and Amplitude.
In one embodiment, each frequency of drive signal can be mutually the same each frequency of haptic signal
Can be mutually the same.
In another embodiment, the X values of touch coordinate and Y value can be calculated by following equations：
Wherein k1 represents skew (offset), and k2 represents magnifying power, and i1 represents the electricity that the 1st angle of touch panel senses
Stream, i2 represent the electric current that the 2nd angle of touch panel senses, and i3 represents the electric current that the 3rd angle of touch panel senses, and i4 is represented
The electric current that the 4th angle of touch panel senses.
In order to realize another object of the present invention, touch-sensing controller includes driving part and detection part.Driving
Part is respectively supplied to multiple transmission signals including drive signal and haptic signal to be arranged on multiple biographies on touch panel
Sensor.Detection part performs fast fast Fourier transform (FFT) to the induced signal that is sensed to sensor) to obtain the sense
The Frequency and Amplitude of signal is surveyed, and touch coordinate is calculated based on Frequency and Amplitude.
In one embodiment, the frequency of haptic signal may be lower than the frequency of drive signal.
In another embodiment, touch sensible controller may further include high-pass filtering part and be used to remove low frequency
Component (haptic signal in the induced signal that each sensor senses).
In another embodiment, sensing element can include current detecting part for detecting induced signal；Amplifier
Part is used for the induced signal for amplifying current detecting part output；Analog to digital conversion component is used for the sense of numeral conversion amplification
Induction signal is so as to exporting sensed data；Fast Fourier Transform (FFT) part is used for Fourier transformation sensed data；And touch measurement
Part is used for the Frequency and Amplitude based on the sensed data after Fourier transformation and calculates touch coordinate.
In another embodiment, sensing element may further include each frequency that control unit is used to control drive signal
Rate and Frequency and Amplitude and each frequency and Frequency and Amplitude for controlling haptic signal.
In order to realize another object of the present invention, touch induction device includes touch panel and touch sensible controller.
Touch panel includes multiple sensors.Touch sensible controller is multiple transmission signals including drive signal and haptic signal point
Indescribably supply each sensor, sensor sensing induced signal by Fast Fourier Transform (FFT) (FFT) be transformed into frequency domain with
The Frequency and Amplitude of sensing signal is obtained, Frequency and Amplitude is then based on and calculates touch coordinate.
In one embodiment, drive signal likely corresponds to high-frequency signal, and haptic signal likely corresponds to low frequency signal.
It is of the invention by output driving according to described touch sensible method, touch sensible controller and touch induction device
Signal receives induced signal to calculate touch coordinate to the sensor for being arranged on each angle of touch panel, and by sensor.At this
In, Fast Fourier Transform (FFT) (FFT) can be applied to induced signal by the present invention, be then based on Frequency and Amplitude and calculated touch seat
Mark.Therefore, since noise component and touch component that induced signal includes are easy to and be distinguished from each other, the present invention can increase
Touch panel it is accurate.Believe moreover, further the haptic signal with low frequency component is driven with the touch with high fdrequency component
Number it is supplied to sensor to make touch panel that further there is feeling function.
Brief description of the drawings
More than the present invention and other features will become more with aspect in more detailed embodiment explanation with reference to accompanying drawing
Add it is clear, wherein：
Fig. 1 is the concept map of conventional surface capacitive touch panel.
Fig. 2 corresponds to the structure chart of the touch induction device of the embodiment of the present invention.
Fig. 3 is the one-dimensional principle concept figure of surface capacitance touch panel.
Fig. 4 is in the one-dimensional equivalent circuit diagram touched when occurring.
Fig. 5 is the equivalent circuit diagram of circuit diagram shown in Fig. 4.
Fig. 6 is the two-dimentional principle concept figure of surface capacitance touch panel.
Fig. 7 is the structure chart of the example of touch sensible controller shown in Fig. 2.
Fig. 8 is the structure chart of AC signal generator shown in Fig. 7.
Fig. 9 A are the ripples of the induced signal of the transmission signal that AC signal generator shown in Fig. 8 exports and sensor sensing
Shape figure.
Fig. 9 B are the spectrograms of each signal shown in Fig. 9 A.
Figure 10 is the circuit diagram of signal adder example shown in Fig. 8.
Figure 11 is the structure chart of the operation of touch sensible controller shown in Fig. 7.
Figure 12 is the structure chart of another example of touch sensible controller shown in Fig. 2.
Embodiment
Below with reference to specific embodiment, and referring to the drawings, the present invention will be described in further detail.But need to illustrate
, the present invention can be implemented by many multi-forms, should not be construed as the restriction to the embodiment of the present invention.On the contrary,
There is provided these embodiments will make the present invention thorough and complete publicly, and will fully pass on the scope of the present invention to this area
Technical staff.
When element or layer are referred to as " being covered in ", when " being connected to " or " being coupled to " another element or layer, it can be understood as
It directly covers, is connected or coupled to another element or layer, or intermediary element or layer be present.On the contrary, work as element or layer quilt
Referred to as " directly overlaying ", " being directly connected to " or " being directly coupled to " another element or during layer, in the absence of intermediary element or
Layer.Identical label refers to identical element.As used herein, term "and/or" is included listed by one or more correlations
Any combination of project and all combinations.
The term such as " although first ", " second ", " the 3rd " may be used to describing in the text various elements, part, region,
Layer and/or part, but these terms should not be construed as the restriction to these elements, part, region, layer and/or part.These
Term is only used for distinguishing each element, part, region, layer and/or part.Therefore, " first " element described below, part,
Region, layer and/or part without departing from present invention teach that in the case of can equally be referred to as " second " part.
Such as " ... under ", " ... below ", " lower section ", " ... on ", the art of the space correlation such as " top "
Language can be used for the element or feature and another element or the relation of feature shown in brief description figure in the text.Can be with
Be interpreted as space correlation term be intended to comprising in addition to the orientation described in accompanying drawing device in use or operation other
Different orientation.For example, if the device in accompanying drawing is reversed, be now described as be in other elements or feature " under " or " under
The element in face " is by positioned at their " top ".Therefore, exemplary term " following " can include above and below two orientation.
Device can be by other positioning (being rotated by 90 ° or in other orientation), and the description of the space correlation to being used herein is carried out
It is corresponding to explain.
Term used herein should not be construed as the limit to the present invention only for reaching the purpose of description specific embodiment
It is fixed.As used herein, singulative is also intended to include plural form, unless context clearly remarks additionally.In this specification
The term " comprising " used, which is further understood that, refers in particular to stated feature, integer, step, operation, element and/or part
Presence, but be not precluded from existing or add one or more of the other feature, integer, step, operation, element, part and/or group
Part.
Embodiments of the invention are herein by by referring to the signal of the idealized embodiments (and intermediate structure) of the present invention
Profile is described.Thus, for example it is to be expected due to illustrating change in shape caused by manufacturing technology and/or tolerance
's.So of the invention is that embodiment is not limited to given shape shown in this specification, and should include due to such as manufacturing
Form variations caused by technique etc..For example, the injection zone with rectangle form in its edge generally with circular or curved
Bent feature and/or the gradient of implantation concentration, rather than change from the binary for being injected into non-injection regions.Likewise, pass through injection
The disposal area of formation can form the injection in some regions between region surface in burying of occurring of injection.Therefore, in accompanying drawing
Shown region is schematical, and their shape does not indicate that the true shape in device region, and is not construed as pair
The restriction of the scope of the invention.
Unless otherwise indicated, all terms (including technical term and scientific terminology) used in this specification have this hair
Bright one skilled in the art be generally understood as implication.It is further understood that, such as in common dictionary
Defined in term should be interpreted as having with them in the consistent implication of association area context, unless clearly fixed herein
Justice, otherwise it should not explained with the meaning of idealization or overly formal.
Below with reference to accompanying drawing, the present invention will be described in detail.
Fig. 2 corresponds to the structure chart of the touch induction device of the embodiment of the present invention.
Reference picture 2, it is (following that a kind of touch induction device corresponding to the embodiment of the present invention includes surface capacitance touch panel
It is expressed as touch panel) 100 and touch sensible controller 200.In the present embodiment, the touch induction device is in capacitively coupled
Middle calculating touch coordinate.
Touch panel 100 includes multiple sensors.Touch panel 100 is generally substantially transparent, to allow user to lead to
Cross touch panel 100 and see object (other ancillary equipment of computer, handheld device, mobile phone, or pixellated display
Deng).In the present embodiment, sensor is arranged on each angle of touch panel 100.When from the Plane Angle from Fig. 2, the
One sensor 110 is arranged on the upper left corner of touch panel 100, and second sensor 120 is arranged on the upper right corner of touch panel 100,
3rd sensor 130 is arranged on the lower left corner of touch panel 100, and the 4th sensor 140 is arranged on the bottom right of touch panel 100
Angle.
Touch sensible controller 200 distinguishes output drive signal to first to fourth sensor 110,120,130 and 140.
Each drive signal can be output to first to fourth sensor 110,120,130 and 140 simultaneously.Between each drive signal
Frequency can be with identical.
In addition, touch sensible controller 200 can export haptic signal respectively to first to fourth sensor 110,120,
130 and 140.Drive signal and haptic signal can be output to first to fourth sensor 110,120,130 and 140 simultaneously.Respectively
Frequency between individual haptic signal can be with identical.Moreover, the frequency of haptic signal is lower than drive signal.That is, tactile
Signal corresponds to low frequency, and drive signal corresponds to high frequency.
Touch sensible controller 200 is based on each biography sensed to first to fourth sensor 110,120,130 and 140
Feel signal and carry out the transducing signal Frequency and Amplitude calculating touch coordinate that Fast Fourier Transform (FFT) operation obtains.In the present embodiment,
Each transducing signal Frequency and Amplitude can be directly proportional to electric current.
The touch coordinate Computing Principle of touch sensible controller 200 is described below.
Fig. 3 is the one-dimensional principle concept figure of surface capacitance touch panel.
Reference picture 3, AC signal " e " are applied to the Part I of touch panel 100 by a current sense resistor " r "
" A ", AC signal " e " are applied to the Part II " B " of touch panel 100 by a current sense resistor " r ".Touch panel
Resistance value be R.The alternating current phase frequency for being applied to the Part I of touch panel 100 and Part II is identical, touch panel
The potential of 100 Part I and Part II is also identical.
Since 100 two parts of touch panel are applied with the alternating current of same potential, touch panel 100 does not flow through stable state
Electric current.
When touching any one C points between A and B, a capacitor, and meeting will be formed between A-B layers and human body
There is minute current to flow into human body by this capacitor.These displays are in Fig. 4.
Fig. 4 is in the one-dimensional equivalent circuit diagram touched when occurring.
Reference picture 4, it is assumed that the electric current for being applied to the end member of touch panel 100 first is the first electric current " i1 ", it is assumed that is applied to
The electric current of the end member of touch panel 100 second is the second electric current " i2 ", the resistance of the touch point " C " of the end member of touch panel 100 first
It is first resistor " R1 ", the resistance of the touch point " C " of the end member of touch panel 100 second is second resistance " R2 ", can then be counted
Calculation obtains the first electric current " i1 " and the second electric current " i2 ".
Equivalent circuit shown in Fig. 4 can be identical with the equivalent circuit shown in Fig. 5.
Fig. 5 is an equivalent circuit diagram of circuit diagram shown in Fig. 4.
In Figure 5, " relation between total R " (totR) passes through following equations 1 for electric current " I ", voltage " e " and touch point resistance
Definition：
Herein, " total R " is defined touch point resistance by following equations 2：
Moreover, the first electric current " i1 " is defined by following equations 3：
Second electric current " i2 " can be calculated by the method similar to the first electric current " i1 "：
Therefore, first electric current " i1 " of 100 two parts of touch panel and the second electric current " i2 " can pass through following equations 4
Definition：
Herein, the impedance including the cohesion electric capacity and human body resistance that are formed when ' Z ' is and occurred including touching.
All-in resistance (R=R1+R2) and resistance " R1 " and the ratio of touch point " C " are calculated by equation 4.
Since the voltage source of the voltage source " e " of the first electric current " i1 " in equation 4 and the second electric current " i2 " in equation 4
" e " is identical, can obtain following equations 5：
Equation 5 is integrated, following equations 6 can be obtained：
I1 (r+R1)=i2 (r+R2) [equation 6]
In order to obtain R1/R2 ratios in equation 6, substitute R2 with R-R1 and integrate, following equations 7 can be obtained：
Herein, ratioThe inverse ratio of resistance can be used to substitute：
If equation 9 is organized into R1, following equations 10 can be obtained：
Herein, in order to obtain R1/R2 ratios, if by equation 10 divided by R, following equations 11 can be obtained：
Herein, R1/R represents a position of touch point C between A-B.
There is no Z in equation 11.That is, touch point is without including the impedance comprising human body.Therefore, it is known that touch location
It is not dependent on Z size.
In the case of two dimensions, the ac signal with identical phase frequency and potential is applied to touch panel 100 4
The sensor at angle, X-coordinate and Y-coordinate are calculated by above-mentioned one-dimensional computational methods according to the current value that sensor sensing arrives.
Fig. 6 is the two-dimentional principle concept figure of surface capacitance touch panel 100.
Reference picture 6, the ac signal with identical phase frequency and potential is applied to the sensing at 100 4 angles of touch panel
Device, can be according to each current value by calculating X-coordinate and Y-coordinate with one-dimensional identical method.One example and following equations
12 is identical：
Herein, k1 represents skew, and k2 represents amplification.
Fig. 7 is the structure chart of touch sensible controller shown in Fig. 2 200.
With reference to figs. 2 and 7 a kind of touch sensible controller 200 includes driving part 210 and sensing part 220.
Driving part 210 includes AC signal generator 212 and multiple resistance " r ", for providing drive signal to first
To the 4th sensor 110,120,130 and 140.It is supplied to each driving of first to fourth sensor 110,120,130 and 140
The frequency of signal is identical.Drive signal is the ac signal for having identical phase frequency and potential.Driving part 210 provides driving
Signal gives first to fourth sensor 110,120,130 and 140.
Sense the time domain induced signal that part 220 will be sensed by first to fourth sensor 110,120,130 and 140 respectively
The frequency domain induced signal obtained by Fast Fourier Transform (FFT) (FFT) is converted to, is then based on the frequency of induced signal obtained
Amplitude calculates touch coordinate.
Sensing part 220 includes current detecting part 221, amplifier unit 222, analog-digital conversion part 223, quickly
Fourier transformation part 224 and touch measuring part 225.
Current detecting part 221 includes multiple curent changes detection circuit CDC.Current detecting part 221, which is used to detect, to be felt
The induced signal detected is simultaneously supplied to amplifier unit 222 by induction signal.
Amplifier unit 222 includes multiple amplifiers (AMP).The sense that amplifier unit 222 will export from current detecting part 221
Induction signal amplifies and the induced signal of amplification is supplied into analog-digital conversion part 223.
Analog-digital conversion part 223 includes multiple analogue-to-digital converters.Analog-digital conversion part 223 will be put
Big induced signal is converted into the sensed data of number format, and sensed data is supplied into Fast Fourier Transform (FFT) part 224.
Fast Fourier Transform (FFT) part 224 includes multiple fast Fourier transformer FFT.Fast Fourier Transform (FFT) part
Time domain induced signal is converted to frequency domain induced signal so as to obtain frequency component data and Frequency and Amplitude data by 224, and will frequency
Rate component data and Frequency and Amplitude data, which are supplied to, touches measuring part 225.In the present embodiment, time domain sensing is converted into frequency
Domain senses, therefore it is highly useful for Digital Signal Processing.
The Frequency and Amplitude for touching the sensed data that measuring part 225 is obtained based on Fast Fourier Transform (FFT) calculates touch seat
Mark.In the present embodiment, the Frequency and Amplitude of sensed data corresponds to the electric current of sensing.That is, correspond to touch panel 100
The Frequency and Amplitude at first angle is the first electric current, and the Frequency and Amplitude corresponding to 100 second angles of touch panel is the second electric current, right
Should be the 3rd electric current in the Frequency and Amplitude at the 3rd angle of touch panel 100, corresponding to the frequency width at the 4th angle of touch panel 100
Degree is the 4th electric current.Therefore, first to fourth electric current substitution equation 12 can be calculated to the X values and Y value of touch coordinate.
In the present embodiment, touch sensible controller 200 may further include high-pass filtering part 230.High-pass filtering
Part 230 is used to remove the low frequency point in the induced signal sensed from first to fourth each sensor 110,120,130 and 140
Amount, and the induced signal for eliminating low frequency component is supplied to sensing part 220.
In the present embodiment, when the transmission signal bag for being applied to first to fourth each sensor 110,120,130 and 140
When containing haptic signal, high-pass filtering part 230 can filter out the haptic signal being possibly comprised in induced signal.Therefore, it is right
Current detecting part should can be applied in the signal containing high fdrequency component of haptic signal from by high-pass filtering part 230
Removed in the induced signal of part 221.
In the present embodiment, touch sensible controller 200 may further include control unit 240.The control unit
240 can control the frequency and Frequency and Amplitude of drive signal.In the present embodiment, driving part 210 can further provide for touching
Feel signal is given from first to fourth each sensor 110,120,130 and 140.In this case, the control unit 240 enters
One step controls the frequency and Frequency and Amplitude of haptic signal.
In the present embodiment, tactile induction controller 200 may further include HPI 250.The HPI
250 are used to the touch location that touch measuring part 225 detects be supplied to external host (not shown).
Touch sensible controller 200 may further include one or more memory storage (not shown)s be used for store measurement
Size and related parameter, and microprocessor (not shown) is used to complete necessary calculating and control function.
In order to complete the function described in one or more texts, touch sensible controller 200 and/or touch induction device
Other assemblies can be realized by one or more application specific integrated circuits (ASIC), Application Specific Standard Product (ASSP) etc..
Fig. 8 is the structure chart of AC signal generator 212 shown in Fig. 7.Fig. 9 A are AC signal generator 212 shown in Fig. 8
The oscillogram of the induced signal of transmission signal and the sensor sensing of output.Fig. 9 B are the spectrograms of each signal shown in Fig. 9 A.
Reference picture 8,9A and 9B, a kind of AC signal generator 212 include haptic signal generator 2122, drive signal hair
Raw device 2124 and signal adder 2126.
Haptic signal generator 2122 forms the haptic signal with low frequency component, and the haptic signal is supplied into signal
Adder 2126.In the present embodiment, haptic signal has first frequency component " f1 ".
Drive signal generator 2124 forms the drive signal with high fdrequency component, and the drive signal is supplied into signal
Adder 2126.In the present embodiment, drive signal has second frequency component " f2 ".
Signal adder 2126 forms transmission signal by mixing haptic signal and drive signal, and transmission signal is provided
To the from first to the 4th sensor 110,120,130 and 140.Connect respectively from first to fourth sensor 110,120,130 and 140
The each induced signal received is filtered by high-pass filter, and first frequency " f1 " component will be removed.Therefore, in the present embodiment
In, induced signal has second frequency " f2 " component.
Figure 10 is the circuit diagram of the example of signal adder 2126 shown in Fig. 8.
Reference picture 10, signal adder 2126 can include summing amplifier.The summing amplifier includes first resistor
Device R1, second resistance device R2, operational amplifier A MP and feedback resistor RF.
First resistor device R1 includes being connected to the first port of the outlet terminal of haptic signal generator 2122 and is connected to fortune
Calculate the second port of amplifier AMP negative input terminals.
Second resistance device R2 includes being connected to the first port of the outlet terminal of drive signal generator 2124 and is connected to fortune
Calculate the second port of amplifier AMP negative input terminals.
Operational amplifier A MP includes one and is connected to the negative of first resistor R1 second ports and second resistance R2 second ports
Input terminal, a positive input terminal for being connected to the earth, and an outlet terminal for being connected to each sensor.
Feedback resistance RF includes being connected to the first port of operational amplifier A MP negative input terminals and is connected to operation amplifier
The second port of device AMP outlet terminals.
In the present embodiment, the virtual output of summing amplifier output voltage is represented with following equations 13：
In the present embodiment, first voltage V1 can correspond to haptic signal, and second voltage can correspond to drive signal.
Therefore, the virtual output of output voltage can correspond to be mixed with the transmission signal of haptic signal and drive signal.
Figure 11 is the concept map of the operation of touch sensible controller shown in Fig. 7.
Reference picture 11, four angles of touch panel 100 are arranged on from first to fourth sensor 110,120,130 and 140.
Touched to sense, touch sensible controller 200 respectively provides the drive signal containing the first driving frequency f0
To first sensor 110, the drive signal containing the second driving frequency f1 is supplied to second sensor 120, containing the 3rd
Driving frequency f2 drive signal is supplied to 3rd sensor 130, and the drive signal containing the 4th driving frequency f3 is supplied to
4th sensor 140.
When first to fourth frequency f0 when on touch panel 100 without touching, detected from induced signal,
F1, f2 and f3 amplitude are identicals.
But when being touched on touch panel 100, the Frequency and Amplitude detected from induced signal is different.
For example, as shown in figure 11, the induced signal Frequency and Amplitude that 3rd sensor 130 detects and driving signal frequency width
Spend equal.But the induced signal Frequency and Amplitude that second sensor 120 detects is believed than the sensing that first sensor 110 detects
Number Frequency and Amplitude is low.The induced signal Frequency and Amplitude that first sensor 110 detects is than sensing that second sensor 120 detects
Signal frequency amplitude is low.The induced signal Frequency and Amplitude that 4th sensor 140 detects is than sense that first sensor 110 detects
Induction signal Frequency and Amplitude is low.
Therefore, the calculating X-coordinate of equation 12 and Y-coordinate can be based on by touching measurement assembly.
As described above, correspond to the present embodiment, since can be by detecting the frequency of the known drive signal in induced signal
The variable quantity sensing touch of rate component, also just it is easily discriminated and touches component and noise component.Therefore, by using merely through fast
The result of fast Fourier transformation processing, it is the noise component independent measurement expected frequency generated under the computing environment of touch-screen
The variable quantity of induced signal, so the present invention can easily solve the influence as caused by noise.
Furthermore, it is possible to by driving multiple sensors simultaneously to accelerate the touch sensible time in the same time, reach at a high speed
The effect of response.
Moreover, time domain sensing is converted into frequency domain sensing so that Digital Signal Processing is possibly realized.
Under normal circumstances, in order to obtain the notable feature of frequency noise, touch induction device is about by driving frequency
400kHz mark type voltage pulse driving.When the size increase of touch-screen or the resistive component and capacitive component of single-sensor increase
Add, the RC time constants of touch induction device will increase.Therefore, the present invention is not in the voltage with more than 400kHz driving frequencies
Lower driving touch induction device, so as to reduce driving frequency to drive touch induction device.Touched when being driven under low driving frequency
Induction installation is touched, sensing touches will become difficult due to the interference of phone noise.
But corresponding to the present embodiment, driving driving frequency can (i.e. the time constant of sensor) slower than time constant,
Thus the computing for the high electric resistance sensor such as medium-and-large-sized sensor or single interface sensor is that comparison is beneficial.
Figure 12 is the structure chart of another example of touch sensible controller shown in Fig. 2 200.
Reference picture 2 and 12, a kind of touch sensible controller 300 include driving part 210, sensing element 320, high-pass filtering
Part 230, control unit 240 and HPI 250.Except sensing element 320, structure chart shown in Figure 12 substantially with Fig. 7
Shown structure chart is identical, and the same or like element marking shown in Figure 12 has with being used for describing the touch sensible in Fig. 7 above
Controller embodiment identical reference character.The detailed description of any repetition will be omitted hereinafter.
Sensing element 320 includes current detecting part 221, amplifier unit 222, band-pass filter component 326, and simulation-
Digital converter portion part 223, Fast Fourier Transform (FFT) part 224 and touch measuring part 225.Except band-pass filter component 326,
Structure chart shown in Figure 12 is substantially identical with the structure chart shown in Fig. 7.Same or like element marking shown in Figure 12 have with
It is used for describing the embodiment identical reference character of touch sensible part 320 in Fig. 7 above, the detailed description of any repetition will be
Hereinafter omit.
Band-pass filter component includes multiple bandpass filters.Band-pass filter component 326 believes the sensing of special frequency band
Number it is supplied to analog-digital conversion part 223.
As described above, output drive signal of the present invention passes through sensing to the sensor for being each arranged on each angle of touch panel
Device receives induced signal and calculates touch coordinate.Herein, Fast Fourier Transform (FFT) (FFT) can be applied to induced signal, so
Touch coordinate is calculated based on Frequency and Amplitude afterwards.Therefore, since noise component and touch component that induced signal includes are easy to
With being distinguished from each other, the present invention can increase the accurate of touch panel.
Moreover, further the haptic signal with low frequency component and the touch drive signal with high fdrequency component are supplied to
Sensor will make touch panel further have feeling function.
Moreover, the low frequency component haptic signal in the induced signal that touch panel is received by high-pass filter removes,
So the drive signal with high fdrequency component can be individually obtained, therefore also can increases the accurate of touch panel.
Moreover, since sensed data is switched to frequency domain by Fast Fourier Transform (FFT) (FFT), except its of intermediate frequency
Remaining frequency component will be removed, and the noise then included in drive signal can be removed.
Above-described embodiment may apply in various device and system, including touch panel, especially such as cell phone,
Smart mobile phone, personal digital assistant (PDA), portable media player (PMP), digital camera, video camera, PC
(PC), server, work station, notebook computer, DTV, set top box, music player, portable game machine, navigation system
System and/or printer.
Except the embodiment of the present invention that has been described above, it is necessary to it is further noted that, the technical staff in the field should
Understand：Within the spirit and principles in the present invention, the present invention can carried out various defined in appended claims boundary
Modification.
Claims (10)
1. a kind of touch sensible method, including：
Multiple transmission signals including drive signal and haptic signal are respectively supplied to be arranged on to multiple biographies on touch panel
Sensor；
Amplify the induced signal sensed through the sensor；
Digital conversion is carried out to the induced signal of each amplification；
Fast Fourier Transform (FFT) (FFT) is carried out to the induced signal after each numeral conversion, to obtain the frequency width of induced signal
Degree；With
Touch coordinate is calculated based on the Frequency and Amplitude.
2. touch sensible method according to claim 1, wherein the frequency of each drive signal is identical, and each tactile
The frequency of signal is also identical.
3. touch sensible method according to claim 1, wherein the X-coordinate value and Y-coordinate value of the touch coordinate are based on
Below equation calculates：
<mrow>
<mi>X</mi>
<mo>=</mo>
<mi>k</mi>
<mn>1</mn>
<mo>+</mo>
<mi>k</mi>
<mn>2</mn>
<mfrac>
<mrow>
<mi>i</mi>
<mn>2</mn>
<mo>+</mo>
<mi>i</mi>
<mn>3</mn>
</mrow>
<mrow>
<mi>i</mi>
<mn>1</mn>
<mo>+</mo>
<mi>i</mi>
<mn>2</mn>
<mo>+</mo>
<mi>i</mi>
<mn>3</mn>
<mo>+</mo>
<mi>i</mi>
<mn>4</mn>
</mrow>
</mfrac>
</mrow>
<mrow>
<mi>Y</mi>
<mo>=</mo>
<mi>k</mi>
<mn>1</mn>
<mo>+</mo>
<mi>k</mi>
<mn>2</mn>
<mfrac>
<mrow>
<mi>i</mi>
<mn>1</mn>
<mo>+</mo>
<mi>i</mi>
<mn>2</mn>
</mrow>
<mrow>
<mi>i</mi>
<mn>1</mn>
<mo>+</mo>
<mi>i</mi>
<mn>2</mn>
<mo>+</mo>
<mi>i</mi>
<mn>3</mn>
<mo>+</mo>
<mi>i</mi>
<mn>4</mn>
</mrow>
</mfrac>
</mrow>
Wherein k1 represents skew, and k2 represents magnifying power, and i1 represents the electric current that the 1st angle of touch panel senses, and i2, which is represented, to be touched
The electric current that the 2nd angle of panel senses, i3 represent the electric current that the 3rd angle of touch panel senses, and i4 represents touch panel the 4th
The electric current that angle senses.
4. a kind of touch sensible controller, including：
Driving part, multiple transmission signals including drive signal and haptic signal are respectively supplied to be arranged on touch panel by it
On multiple sensors；
Sense part, its induced signal sensed to sensor performs FFT (FFT) to obtain the sensing
The Frequency and Amplitude of signal, it is then based on the Frequency and Amplitude and calculates touch coordinate.
5. touch sensible controller according to claim 4, wherein the frequency of the haptic signal is than the drive signal
Frequency it is low.
6. touch sensible controller according to claim 4, in addition to
High-pass filtering part, for removing low frequency component, the low frequency component corresponds to the sensing letter that each sensor senses
Haptic signal in number.
7. touch sensible controller according to claim 4, wherein the induction part part can include：
Current detecting part, for detecting induced signal；
Amplifier unit；For amplifying the induced signal of the current detecting part output；
Analog to digital conversion component, the induced signal amplified is changed for numeral to export sensed data；
Fast Fourier Transform (FFT) part, for sensed data described in Fourier transformation；And
Components of assays is touched, touch coordinate is calculated for the Frequency and Amplitude based on the sensed data after Fourier transformation.
8. touch sensible controller according to claim 7, wherein the induction part part may further include control unit
Part, for controlling each frequency and Frequency and Amplitude of drive signal and controlling each frequency and Frequency and Amplitude of haptic signal.
9. a kind of touch induction device, including:
Touch panel, it has multiple sensors；With
Touch sensible controller, for multiple transmission signals including drive signal and haptic signal to be respectively supplied into each biography
Sensor, the induced signal that sensor senses is converted into frequency domain to obtain sensing signal by Fast Fourier Transform (FFT) (FFT)
Frequency and Amplitude, and based on the Frequency and Amplitude calculate touch coordinate.
10. touch induction device according to claim 9, wherein the drive signal corresponds to high-frequency signal, it is described to touch
Feel that signal corresponds to low frequency signal.
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|---|---|---|---|
| KR10-2016-0068579 | 2016-06-02 | ||
| KR1020160068579A KR101763139B1 (en) | 2016-06-02 | 2016-06-02 | Touch sensing method, touch sensing controller and touch sensing device having the same |
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Cited By (1)
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| CN110874158A (en) * | 2018-09-04 | 2020-03-10 | 天马日本株式会社 | Haptic rendering device |
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| KR101763139B1 (en) | 2017-08-01 |
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