CN106201101B - Position detecting apparatus - Google Patents
Position detecting apparatus Download PDFInfo
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- CN106201101B CN106201101B CN201610578389.7A CN201610578389A CN106201101B CN 106201101 B CN106201101 B CN 106201101B CN 201610578389 A CN201610578389 A CN 201610578389A CN 106201101 B CN106201101 B CN 106201101B
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- measurement signal
- conductive bar
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- measurement
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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
- G06F3/03—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
Abstract
The present invention discloses a kind of position detecting apparatus, includes: touch screen, includes a plurality of conductive bar；Detecting unit, it is connected to a plurality of conductive bar of the touch screen, include: simulation measurement circuit, receive the string wave from the conductive bar, and multiple predetermined phases in at least period in string wave measure the measurement signal of the simulation of string wave respectively, wherein the predetermined phase is continuous arrangement, and adjacent phasetophase differs identical phase difference；Each measurement signal simulated is converted into the measurement signal of number by analog-to-digital circuit；And processor, the measurement signal of each number according at least period generates the weighting measurement signal of the number in an at least period multiplied by the product that the sine value of predetermined phase when measuring generates respectively, and the weighting measurement signal of all numbers in an at least period is added up to generate complete measurement signal.
Description
The application is China application No. is 201310025279.4, entitled " method and apparatus of measurement signal "
The divisional application of patent application, the applying date of original application are on 01 23rd, 2013.
Technical field
The invention relates to a kind of method and apparatus of measurement signal, especially a kind of to be done using the mode of signal in orthogonal
The position detecting apparatus of the measurement signal on signal processing basis.
Background technique
Existing known mutual capacitance type sensor (mutual capacitive sensor), including insulation surface layer, first
Conductive layer, dielectric layer, the second conductive layer, wherein the first conductive layer and the second conductive layer are respectively provided with a plurality of first conductive bar and
Two conductive bars, these conductive bars can be to be made of multiple conductive sheets with the connecting line for conductive sheet of connecting.
When carrying out mutual capacitance type detecting, one of the first conductive layer and the second conductive layer are driven, and the first conductive layer
Another with the second conductive layer is detected.For example, driving signal is provided to the first conductive bar of each one by one, and correspond to
Each is provided the first conductive bar of driving signal, detects the signal of the second all conductive bars to represent and be provided driving letter
Number the first conductive bar and all second conductive bars between confluce capacitive couplings signal.Whereby, it can obtain and represent all
The capacitive couplings signal of confluce between one conductive bar and the second conductive bar, becomes a capacitance image.
Accordingly, capacitance image when not touched can be obtained as benchmark, by comparison basis and Subsequent detection
Difference between the capacitance image arrived to judge whether by external conductive object approached or covered, and is further sentenced
The disconnected position for being approached or covering out.However, in the noise jamming of many of ambient enviroment, such as the noise jamming of low frequency or narrow
The noise jamming of frequency may cause the deviation of erroneous judgement or position.
It can be seen that above-mentioned existing technology is in structure and use, it is clear that there are still there is inconvenient and defect, and urgently plus
To be further improved.Therefore a kind of method and apparatus of new structural measurement signal how is founded, current industry is also become
Pole needs improved target.
Summary of the invention
It is an object of the present invention to overcome defect existing for existing technology, and provide a kind of new structural measurement letter
Number method and apparatus, the technical problem to be solved is that when doing the basis of signal processing using the mode of signal in orthogonal, with
Square wave driving can have many odd harmonics, and when the interference for having narrow frequency occurs near odd harmonic, meeting can not eliminate the interference
Influence.A purpose of the invention is that a coefficient table is established according to multiple predetermined phases, and wherein each predetermined phase is referred to
A fixed coefficient.String wave is measured in multiple predetermined phases of per half period to generate measurement signal respectively, then according to each measurement
The corresponding multiplication of phase when signal and measurement, to generate weighting measurement signal respectively.Later, then each weighting is measured and is believed
Number aggregation to generate the complete measurement signal for representing single measurement so that the interference of higher hamonic wave can inhibit to get off.
The object of the invention to solve the technical problems adopts the following technical solutions to realize.It proposes according to the present invention
A kind of measurement signal method, including:
Receive string wave；The measurement signal of string wave is measured respectively in multiple predetermined phases in an at least period for string wave；Foundation
Each measurement signal in an at least period is generated multiplied by the product that the sine value of predetermined phase when measuring generates respectively
The weighting measurement signal in an at least period；And all weighting measurement signals in an at least period are added up to generate
Complete measurement signal.
The object of the invention to solve the technical problems also can be used following technical measures and further realize.
The method of measurement signal above-mentioned, it is characterised in that further include: the string wave is provided in one of touch screen or one group
Drive conductive bar；And a plurality of sensing by being overlapped in touch screen with described one or one group of driving conductive bar for being provided string wave
One of conductive bar receives the string wave.
The method of measurement signal above-mentioned, it is characterised in that further include: each measurement signal is believed by the measurement simulated
Number be converted into the measurement signal of number, wherein be simulation by the measurement signal that string wave measures, and weight measurement signal be with
The measurement signal of number is multiplied by the sine value of number to generate the product of number.
The method of measurement signal above-mentioned, it is characterised in that weighting measurement signal is to be multiplied by integer with the measurement signal of number
Value generates the product of number, and each sine value is to be multiplied by identical multiple to generate integer value.
The method of measurement signal above-mentioned, it is characterised in that further include: each weighting measurement signal is added by what is simulated
Power measurement signal be converted into number weighting measurement signal, wherein measurement signal be simulation, and each simulate weighting
Measurement signal is the multiple of the sine value of predetermined phase when foundation zooms into measurement by the measurement signal simulated to generate.
The method of measurement signal above-mentioned, it is characterised in that all weighting measurement signals in an at least period
Aggregation is to be implemented in a manner of integral, and measurement signal and weighting measurement signal are simulations.
The method of measurement signal above-mentioned, it is characterised in that the predetermined phase is continuous arrangement, adjacent phasetophase phase
The identical phase difference of difference.
The method of measurement signal above-mentioned, it is characterised in that phase difference is 60 degree.
The object of the invention to solve the technical problems also uses following technical scheme to realize.It is proposed according to the present invention
A kind of device of measurement signal, including: simulation measurement circuit receives string wave, and more in an at least period for string wave
A predetermined phase measures the measurement signal of the simulation of string wave respectively；Analog-to-digital circuit, the measurement signal that each is simulated
It is converted into the measurement signal of number；And processor, the measurement signal of each number according at least period multiply respectively
The product that the sine value of predetermined phase when measuring generates generates the weighting measurement signal of the number in an at least period,
And the weighting measurement signal of all numbers in an at least period is added up to generate complete measurement signal.
The object of the invention to solve the technical problems also can be used following technical measures and further realize.
The device of measurement signal above-mentioned, it is characterised in that digital weighting measurement signal is multiplied with the measurement signal of number
Upper integer value generates the product of number, and each sine value is to be multiplied by identical multiple to generate integer value.
The device of measurement signal above-mentioned, it is characterised in that the predetermined phase is continuous arrangement, adjacent phasetophase phase
The identical phase difference of difference.
The device of measurement signal above-mentioned, it is characterised in that phase difference is 60 degree.
In addition the object of the invention to solve the technical problems is realized using following technical scheme again.It mentions according to the present invention
A kind of device of measurement signal out, including: simulation measurement circuit receives string wave, and in an at least period for string wave
Multiple predetermined phases measure respectively string wave simulation measurement signal；Amplifying circuit, respectively according to the measurement signal by simulating
The multiple of the sine value of predetermined phase when zooming into measurement generate one simulation weighting measurement signal；Analog-to-digital electricity
Each weighting measurement signal simulated is converted into the weighting measurement signal of number by road；And processor, by described at least one
The weighting measurement signal of all numbers in period is added up to generate complete measurement signal.
The object of the invention to solve the technical problems also can be used following technical measures and further realize.
The device of measurement signal above-mentioned, it is characterised in that the predetermined phase is continuous arrangement, adjacent phasetophase phase
The identical phase difference of difference.
The device of measurement signal above-mentioned, it is characterised in that phase difference is 60 degree.
In addition the object of the invention to solve the technical problems is also realized using following technical scheme.It mentions according to the present invention
A kind of device of measurement signal out, including: simulation measurement circuit receives string wave, and in an at least period for string wave
Multiple predetermined phases measure respectively string wave simulation measurement signal；Amplifying circuit, respectively according to the measurement signal by simulating
The multiple of the sine value of predetermined phase when zooming into measurement generate one simulation weighting measurement signal；Integrating circuit, will
The weighting of all simulations in an at least period measures signal integration to generate the complete measurement signal of simulation；And simulation turns
Each complete measurement signal simulated is converted into the complete measurement signal of number by digital circuit.
The object of the invention to solve the technical problems also can be used following technical measures and further realize.
The device of measurement signal above-mentioned, it is characterised in that the predetermined phase is continuous arrangement, adjacent phasetophase phase
The identical phase difference of difference.
The device of measurement signal above-mentioned, it is characterised in that phase difference is 60 degree.
The present invention has obvious advantages and beneficial effects compared with the existing technology.From the above technical scheme, this hair
Bright main technical content is as follows: a kind of method of measurement signal proposed according to the present invention, comprising: receives string wave；In string wave
Multiple predetermined phases in an at least period measure the measurement signal of string wave respectively；Each measurement according at least period
Signal generates the weighting in an at least period multiplied by the product that the sine value of predetermined phase when measuring generates respectively and measures
Signal；And all weighting measurement signals in an at least period are added up to generate complete measurement signal.According to the present invention
The device of a kind of measurement signal proposed, comprising: simulation measurement circuit receives string wave, and in an at least period for string wave
Multiple predetermined phases measure the measurement signal of the simulation of string wave respectively；Analog-to-digital circuit believes the measurement of each simulation
Number it is converted into the measurement signal of number；And processor, the measurement signal difference of each number according at least period
The weighting that the number in an at least period is generated multiplied by the product that the sine value of predetermined phase when measuring generates measures letter
Number, and the weighting measurement signal of all numbers in an at least period is added up to generate complete measurement signal.According to this
Invent a kind of device of the measurement signal proposed, comprising: simulation measurement circuit receives string wave, and at least one week of string wave
Multiple predetermined phases of phase measure the measurement signal of the simulation of string wave respectively；Amplifying circuit is believed according to the measurement by simulating respectively
The multiple of the sine value of predetermined phase when number zooming into measurement generates the weighting measurement signal of a simulation；Analog-to-digital
Each weighting measurement signal simulated is converted into the weighting measurement signal of number by circuit；And a processor, will it is described extremely
The weighting measurement signal of all numbers in a few period is added up to generate complete measurement signal.A kind of amount proposed according to the present invention
Survey the device of signal, comprising: simulation measurement circuit receives string wave, and multiple predetermined phases in at least period in string wave
The measurement signal of the simulation of string wave is measured respectively；Amplifying circuit, respectively according to when zooming into measurement by the measurement signal simulated
The multiple of the sine value of predetermined phase come generate one simulation weighting measurement signal；Integrating circuit, will at least period
The weightings of all simulations measure signal integration to generate the complete measurement signal of simulation；And analog-to-digital circuit, it will be every
The complete measurement signal of one simulation is converted into the complete measurement signal of number.
In addition the object of the invention to solve the technical problems is also realized using following technical scheme.It mentions according to the present invention
A kind of position detecting apparatus out includes: touch screen, includes a plurality of conductive bar；Detecting unit is connected to a plurality of of the touch screen
Conductive bar includes: simulation measurement circuit receives the string wave from the conductive bar, and multiple in an at least period for string wave
Predetermined phase measures the measurement signal of the simulation of string wave respectively, wherein the predetermined phase is continuous arrangement, adjacent phasetophase
Differ identical phase difference；Each measurement signal simulated is converted into the measurement signal of number by analog-to-digital circuit；With
And processor, the measurement signal of each number according at least period is respectively multiplied by the sine of predetermined phase when measuring
The product that value generates generates the weighting measurement signal of the number in an at least period, and by the institute in an at least period
There is the weighting measurement signal of number to add up to generate complete measurement signal.
The object of the invention to solve the technical problems also can be used following technical measures and further realize.
Position detecting apparatus above-mentioned, it is characterised in that digital weighting measurement signal is multiplied by with the measurement signal of number
Integer value generates the product of number, and each sine value is to be multiplied by identical multiple to generate integer value.
Position detecting apparatus above-mentioned, it is characterised in that the phase difference is 60 degree.
In addition the object of the invention to solve the technical problems is also realized using following technical scheme.It mentions according to the present invention
A kind of position detecting apparatus out includes: touch screen, includes a plurality of conductive bar；Detecting unit is connected to a plurality of of the touch screen
Conductive bar includes: simulation measurement circuit receives the string wave from the conductive bar, and multiple in an at least period for string wave
Predetermined phase measures the measurement signal of the simulation of string wave respectively, wherein the predetermined phase is continuous arrangement, adjacent phasetophase
Differ identical phase difference；Amplifying circuit, respectively just according to predetermined phase when zooming into measurement by the measurement signal simulated
The multiple of string value come generate one simulation weighting measurement signal；Analog-to-digital circuit measures the weighting of each simulation
Signal is converted into the weighting measurement signal of number；And processor, the weighting of all numbers in an at least period is measured
Signal is added up to generate complete measurement signal.
The object of the invention to solve the technical problems also can be used following technical measures and further realize.
Position detecting apparatus above-mentioned, it is characterised in that the phase difference is 60 degree.
In addition the object of the invention to solve the technical problems is also realized using following technical scheme.It mentions according to the present invention
A kind of position detecting apparatus out includes: touch screen, includes a plurality of conductive bar；Detecting unit is connected to a plurality of of the touch screen
Conductive bar includes: simulation measurement circuit receives the string wave from the conductive bar, and multiple in an at least period for string wave
Predetermined phase measures the measurement signal of the simulation of string wave respectively；Amplifying circuit, foundation is zoomed by the measurement signal simulated respectively
The multiple of the sine value of predetermined phase when measurement come generate one simulation weighting measurement signal；Integrating circuit, by described in extremely
The weighting of all simulations in a few period measures signal integration to generate the complete measurement signal of simulation；And analog-to-digital electricity
Each complete measurement signal simulated is converted into the complete measurement signal of number by road.
The object of the invention to solve the technical problems also can be used following technical measures and further realize.
Position detecting apparatus above-mentioned, it is characterised in that the predetermined phase is continuous arrangement, adjacent phasetophase difference
Identical phase difference.
Position detecting apparatus above-mentioned, it is characterised in that the phase difference is 60 degree.
By above-mentioned technical proposal, the position detecting apparatus of measurement signal of the present invention at least has following advantages and beneficial to effect
Fruit:
1, inhibit the interference of higher hamonic wave；
2, processing is not required to complicated circuit, and simple digital logic circuit is only needed to can be completed；And
3, has the advantage simplified than floating point arithmetic using system of integers numerical value with integer arithmetic.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And it can be implemented in accordance with the contents of the specification, and in order to allow above and other objects of the present invention, feature and advantage can
It is clearer and more comprehensible, it is special below to lift preferred embodiment, and cooperate attached drawing, detailed description are as follows.
Detailed description of the invention
Figure 1A and 1B is the schematic diagram of mutual capacitance type sensor；
Fig. 1 C is the schematic diagram of mutual capacitance type detecting；
Fig. 2 is the schematic diagram that measurement signal is influenced by high order odd harmonic；
Fig. 3 is that multiple predetermined phases in per half period measure schematic diagram of the string wave to generate a measurement signal respectively；
Fig. 4 is the schematic diagram after measurement signal inhibits high order odd harmonic to influence；
Fig. 5 is the flow diagram of the method for the measurement signal of first embodiment according to the present invention；
Fig. 6 is the circuit diagram of the device of the measurement signal of second embodiment according to the present invention；
Fig. 7 is the circuit diagram of the device of the measurement signal of 3rd embodiment according to the present invention；And
Fig. 8 is the circuit diagram of the device of the measurement signal of fourth embodiment according to the present invention.
[main element symbol description]
100: position detecting apparatus 110: display
120: the 120A: the first sensed layer of touch screen
120B: the second sensed layer 130: driving/detecting unit
140: conductive bar 140A, the Tx: the first conductive bar
140B, Rx: the second conductive bar 160: controller
161: processor 162: memory
170: host 171: central processing unit
173: storage element PWM: pulse width adjustment signal
A: amplitude of vibration I: string wave
61,71,81: simulation measurement circuit 72,82: amplifying circuit
73,83: variable resistance 84: integrating circuit
ADC: analog-to-digital circuit CPU: processor
Vanalog: the measurement signal Vdigital: digital measurement signal of simulation
VWanalog: the weighting measurement signal of simulation
VWdigital: digital weighting measurement signal
VOanalog: the complete measurement signal of simulation
VOdigital: digital complete measurement signal
Specific embodiment
It is of the invention to reach the technical means and efficacy that predetermined goal of the invention is taken further to illustrate, below in conjunction with
Attached drawing and preferred embodiment, to the method and apparatus of measurement signal proposed according to the present invention its specific embodiment, structure, spy
Sign and its effect, detailed description is as follows.
Please refer to Figure 1A, for applied to a kind of position detecting apparatus 100 of the invention, including touch screen 120, with driving/
Detecting unit 130.Touch screen 120 has sensed layer.In example of the present invention, it may include the sensing of the first sensed layer 120A and second
Layer 120B, the first sensed layer 120A and the second sensed layer 120B have multiple conductive bars 140 respectively, wherein the first sensed layer 120A
Multiple second conductive bar 140B of multiple first conductive bar 140A and the second sensed layer 120B are overlapping.In another example of the present invention
In, multiple first conductive bar 140A and the second conductive bar 140B can be only fitted in coplanar sensed layer.Driving/detecting unit
130 signal one sensitive information of generation according to multiple conductive bars 140.It is that detecting is driven such as in self-capacitance detecting
It is not driven the/part that directly drives of detecting unit 130 that conductive bar 140, and in mutual capacitance type detecting, which is detecting,
Conductive bar 140.In addition, touch screen 120 can be configuration on display 110, can be between touch screen 120 and display 110
There is configuration shielded layer (shielding layer) (not showing in icon) or without configuration shielded layer.In preferable example of the invention
In, in order to allow the thinner of touch screen 120, without configuration shielded layer between touch screen 120 and display 110.
Aforementioned first conductive bar and the second conductive bar can be with a plurality of row conductive bar and column conductive bar of row or column arrangement,
It can also be with a plurality of first dimension conductive bar and the second dimension conductive bar of the first dimension and the arrangement of the second dimension, or along the
The a plurality of first axle conductive bar and the second axis conductive bar of one axis and the arrangement of the second axis.In addition, aforementioned first conductive bar is led with second
Electric item is can be to each other with orthogonal overlapping, can also be with nonopiate overlapping.Such as in polar coordinate system, described first is led
One of electric item or the second conductive bar can be radial arrangement, and first conductive bar or the another of the second conductive bar can be
Annular arrangement.Furthermore one of first conductive bar or the second conductive bar can be to drive conductive bar, and first conductive bar
Or second conductive bar it is another can for detecting conductive bar." first dimension " and " the second dimension ", " first axle " and " the
Two axis ", " driving " and " detecting ", " by driving " and " being detected " conductive bar all can be used to indicate " first " above-mentioned and " second "
Conductive bar, including but not limited to composition orthogonal grid (orthogonal grids), which can also be that composition is other, has the first dimension
Degree overlaps the geometry framework (geometric configurations) of (intersecting) conductive bar with the second dimension.
Position detecting apparatus 100 of the invention can be applied in a calculator system, and example as shown in Figure 1B wraps
Include controller 160 and host 170.Controller includes driving/detecting unit 130, (is not shown with operatively coupled touch screen 120
In diagram).In addition, controller 160 may include processor 161, control driving/detecting unit 130 generates sensitive information, sensing letter
Breath can be previously stored in memory 162, and device 161 for processing accesses.In addition, host 170 constitutes the main body of computing system, mainly
Including central processing unit 171, and for the storage element 173 that central processing unit 171 accesses, and show operation result
Display 110.
It include transport interface between controller 160 and host 170 in another example of the present invention, control unit passes through transmission
Interface transfers data to host, those skilled in the art can deduce transport interface include but is not limited to UART,
The various wired or wireless transport interfaces such as USB, I2C, Bluetooth, WiFi, IR.In example of the present invention, the data of transmission
It is available to can be position (such as coordinate), identification result (such as gesture code), order, sensitive information or other controllers 160
Information.
In example of the present invention, sensitive information, which can be, controls generated initial sensitive information by processor 161
(initial sensing information), transfer to host 170 carry out position analysis, such as position analysis, gesture judgement,
Order identification etc..In another example of the present invention, sensitive information can be first to be analyzed by processor 161, then will judgement
Position out, gesture, order etc. are submitted to host 170.The present invention includes but is not limited to aforementioned example, the art
Those of ordinary skill can deduce interacting between other controllers 160 and host 170.
In the crossover region of each conductive bar, the two poles of the earth are constituted with conductive bar under upper.Each crossover region can be considered
Pixel (pixel) in image (image), when having one or more external conductive objects close or touching, the image
It can be considered the image for taking touching (such as finger is touched in the aspect (pattern) of sensing device).
When being provided driving signal by driving conductive bar, self-capacitance (self is constituted by driving conductive bar itself
Capacitance), and by each crossover region on driving conductive bar mutual capacitance (mutual capacitance) is constituted.Before
The self-capacitance detecting stated is the self-capacitance for detecting all conductive bars, especially suitable for judging the close of single external conductive object
Or contact.
Mutual capacitance type above-mentioned detecting, be when being provided driving signal by driving conductive bar, by with by driving conductive bar
The capacitance or capacitance change of all crossover regions on all sensed conductive bar detecting driving conductive bars of different dimensions arrangement,
With the column pixel being considered as in image.Accordingly, the pixel for collecting all column constitutes the image.When having outside one or more
When conductive object is close or touches, the image can be considered the image for taking touching, especially suitable for judging that multiple outsides are led
Electric object near to or in contact with.
These conductive bars (the first conductive bar and the second conductive bar) can be to be made of transparent or opaque material, such as
It can be and be made of transparent tin indium oxide (ITO).It can be divided into single layer structure (SITO in structure；Single ITO) and it is double-deck
Structure (DITO；Double ITO).The ordinary person of the art can deduce the material of other conductive bars, no longer describe.
For example, carbon nanotubes.
It is using laterally as first direction, and using longitudinal as second direction, therefore transverse direction in example of the invention
Conductive bar is the first conductive bar, and longitudinal conductive bar is the second conductive bar.Those skilled in the art can push away
Know that above description is one of the example of invention, is not intended to limit the invention.For example, it may be using longitudinal direction as first direction,
And laterally as second direction.In addition, the number of the first conductive bar and the second conductive bar can be identical, it is also possible to not
Together, for example, the first conductive bar has N item, the second conductive bar has M item.
When carrying out the detecting of two-dimensions mutual capacitance type, it is conductive that the driving signal of exchange is sequentially provided to each first
Item, and the dimension that the conductive bar of driving signal is provided corresponding to each is obtained via the signal of second conductive bar
Sensitive information, set then constitute a two-dimensions sensitive information corresponding to the sensitive information of all first conductive bars.Described one
Dimension sensitive information can be the signal generation according to second conductive bar, be also possible to according to second conductive bar
Signal and the measures of dispersion of benchmark generate.In addition, sensitive information can be the electric current, voltage, capacitive couplings of basis signal
Amount, the quantity of electric charge or other characteristic electrons generate, and can be and exist in the form of analog or digital.
When actually approaching without external conductive object or cover touch screen or system does not judge external conductive pair
When as close or covering touch screen, position detecting apparatus can generate benchmark by the signal of second conductive bar, and benchmark is in
Existing is the stray capacitance on touch screen.Sensitive information can be to be generated according to the signal of the second conductive bar, or according to second
The signal of conductive bar subtracts produced by benchmark.
Fig. 1 C is please referred to, for the schematic diagram of above-mentioned two-dimensions mutual capacitance type detecting.Pulse is sent out by the first end conductive bar Tx
Width adjustment (PWM) signal can be in the second conductive bar through the capacitive couplings between the first conductive bar Tx and the second conductive bar Rx
Rx terminates the signal for receiving frequency identical with the end Tx and gap fixed phase difference.
The present invention proposes a kind of method and apparatus of measurement signal, is the base that signal processing is done using the mode of signal in orthogonal
Plinth.
For example, the signal received that Rx termination receives is S (t)=Asin (ω t), wherein A is amplitude.
Only in m=n, just there is integrated value.
But the circuit of general signal multiplication is not easy to implement on circuit, so existing known techniques all adopt the mode of square wave
Implement, become be
I=∫ (PWM) sgn (PWM) dt.
But the Fourier series of square wave expansion itself can be expressed as
There can be many odd harmonics, therefore will become.
Wherein S (t)=square wave or sine wave+n (t), wherein n (t) be noise or interference,
It can be found that can there are the components of odd harmonic.
Therefore, when the interference for having narrow frequency occurs near odd harmonic, meeting can not eliminate the influence of the interference, such as Fig. 2 institute
Show.Especially when the data for taking same phase in each half period using analog-to-digital circuit ADC, it is then added ∑ (positive half cycle again
Phase-negative half-cycle) after, the influence for high order odd harmonic is bigger.
It therefore, is to be driven using string wave, and establish one according to multiple predetermined phases under optimal mode of the invention
Coefficient table, wherein each predetermined phase is designated a coefficient.In preferable example of the invention, coefficient is predetermined phase
The multiple of sine value, as shown in the table.
| Phase | Coefficient |
| 30° | 1 |
| 90° | 2 |
| 150° | 1 |
| 210° | -1 |
| 270° | -2 |
| 330° | -1 |
Table 1
In addition, multiple predetermined phases in per half period measure string wave to generate measurement signal respectively, as shown in figure 3, its
In measure at least half period altogether.Later, the corresponding multiplication of phase according to each measurement signal and when measuring, with respectively
Weighting measurement signal is generated, then each weighting measurement signal is added up to generate the complete measurement signal for representing single measurement.
The present invention can also adopt pulse width adjustment (PWM) signal.Although each cycle measures 6 amounts in table 1 and Fig. 4
Signal is surveyed, measures poor 60 degree of phase every time, is only used, is not intended to limit the invention, this technology convenient for present invention citing
Field tool usually intellectual can deduce that each cycle can be measurement 2,4 or more measurement signal, and measure every time
It can be the identical phase of difference and be also possible to differ different phases, the present invention is not limited thereto.
According to above-mentioned, complete measurement signal be can be
Refering to aforementioned
AD (k) is equivalent to sin (m ω t), and C (k) is equivalent to sin (n ω t), wherein m=n.In table 1, coefficient value
It is 2 times of the sine value of phase, this is because being just integer after twice of amplification, integer arithmetic has to be simplified than floating point arithmetic
The advantages of.Accordingly, it in example of the invention, further includes C (k) integer, i.e., will be multiplied by multiple and be presented by C (k) with integer.
Accordingly, the interference of higher hamonic wave can inhibit to get off, as shown in Figure 4.
Above-mentioned can be the aggregation of each weighting measurement signal using Digital Logical Circuits is reached.E.g. measure simulation
Measurement signal (such as AD (k)) after the measurement signal of simulation is converted into the measurement signal signal of number, then carry out each weighting
The operation of measurement signal aggregation.In other words, processing is not required to complicated circuit by this method, only needs simple digital logic circuit
It completes.
According to above-mentioned, in the first embodiment of the present invention, it is a kind of method of measurement signal, please refers to shown in Fig. 5.It is first
First, as indicated in step 510, string wave is received.String wave can be to be provided by controller above-mentioned, provides string wave in one of touch screen
Or one group of driving conductive bar.In addition, string wave be by touch screen be provided described one or one group of driving conductive bar of string wave
One of overlapping a plurality of sensing conductive bar receive, a plurality of sensing conductive bar first is that via be provided described in string wave
One or one group of driving conductive bar capacitive couplings provide the string wave.Later, as indicated in step 520, at least the one of string wave
Multiple predetermined phases in period measure the measurement signal of string wave respectively, and wherein measurement signal can be simulation or digital.It connects
Get off, as shown in step 530, each measurement signal according at least period is respectively multiplied by predetermined phase when measuring
The product that sine value generates generates the weighting measurement signal in an at least period, wherein weighting measurement signal can be simulation
Or it is digital.Next, as shown in step 540, all weighting measurement signals in an at least period are added up to produce
Raw complete measurement signal, wherein complete measurement signal can be it is simulation or digital.
It is to believe each measurement signal by the measurement that the measurement signal simulated is converted into number in example of the invention
Number, wherein being simulation by the measurement signal that string wave measures, and weighting measurement signal is to be multiplied by number with the measurement signal of number
The sine value of word come generate number product.Similarly, all weighting measurement signals in an at least period are added up to produce
Raw complete measurement signal is also to be executed in a manner of number.In addition, weighting measurement signal be with number measurement signal be multiplied by it is whole
Numerical value generates the product of number, and each sine value is to be multiplied by identical multiple to generate integer value.
It is to be converted into each weighting measurement signal by the weighting measurement signal simulated in another example of the present invention
Number weighting measurement signal, wherein measurement signal be simulation, and each simulation weighting measurement signal be foundation by
The multiple of the sine value of predetermined phase when the measurement signal of simulation zooms into measurement generates.In addition, weighting measurement signal
Aggregation can be to be added up in an analog fashion, is also possible to add up in a digital manner.For example, all weightings in an at least period
Measurement signal aggregation is implemented in a manner of integral, is such as implemented by integrating circuit, and measurement signal is with weighting measurement signal
Simulation.In another example the weighting measurement signal of all simulations is first to carry out analog-to-digital, to generate adding for all simulations
Measurement signal is weighed, is then added up again.
In example of the invention, the predetermined phase is continuous arrangement, and adjacent phasetophase differs identical phase difference,
Such as 60 degree.
Fig. 6 is a kind of device for measurement signal that second embodiment according to the present invention proposes, includes: simulation measurement circuit
61, analog-to-digital circuit ADC, processor CPU.It simulates measurement circuit 61 and receives string wave, and in an at least period for string wave
Multiple predetermined phases measure respectively string wave simulation measurement signal.In example of the invention, string wave be can be with electric current
Mode present, and simulate measurement circuit and can be electric current and turn potential circuit, the electric current of string wave I is turned according to reference resistance R
Change the measurement signal Vanalog of simulation into.In addition, the measurement signal Vanalog that analog-to-digital circuit ADC simulates each
It is converted into the measurement signal Vdigital of number.In addition, measurement letter of the processor according to each number in an at least period
Number Vdigital generates the number in an at least period multiplied by the product that the sine value of predetermined phase when measuring generates respectively
The weighting measurement signal of word, and the weighting measurement signal of all numbers in an at least period is added up to generate full amount
Survey signal.In example of the invention, digital weighting measurement signal is to be multiplied by integer with the measurement signal Vdigital of number
Value generates the product of number, and each sine value is to be multiplied by identical multiple to generate integer value.
Fig. 7 is a kind of device for measurement signal that 3rd embodiment according to the present invention proposes, comprising: simulation measurement circuit
71, amplifying circuit 72, analog-to-digital circuit ADC, processor CPU.It simulates measurement circuit 71 and receives string wave, and in string wave
Multiple predetermined phases in an at least period measure the measurement signal Vanalog of the simulation of string wave respectively.Amplifying circuit 72 respectively according to
The multiple of the sine value of predetermined phase when zooming into measurement according to the measurement signal Vanalog by simulating generate one simulation
Weight measurement signal VWanalog.It is that the multiple is determined with one group of variable resistance 73 in example of the invention.Simulation
Turning digital circuit is the weighting measurement signal that the weighting measurement signal VWanalog of each simulation is converted into number
Next VWdigital is again added the weighting measurement signal VWdigital of all numbers in an at least period by processor
Always to generate complete measurement signal.
Fig. 8 is a kind of device for measurement signal that fourth embodiment according to the present invention proposes, comprising: simulation measurement circuit
81, amplifying circuit 82, integrating circuit 84, analog-to-digital circuit ADC.It simulates measurement circuit 81 and receives string wave, and in string wave
An at least period multiple predetermined phases measure respectively string wave simulation measurement signal Vanalog.Amplifying circuit 82 is distinguished
The multiple of sine value according to predetermined phase when zooming into measurement by the measurement signal Vanalog simulated generates a simulation
Weighting measurement signal VWanalog.It is that the multiple is determined with one group of variable resistance 83 in example of the invention.Product
Parallel circuit 84 integrates the weighting measurement signal VWanalog of all simulations in an at least period to generate the complete of simulation
Measurement signal VOanalog, later again by analog-to-digital circuit ADC, by the complete measurement signal VOanalog of each simulation
It is converted into the complete measurement signal VOdigital of number.
Simulation measurement circuit above-mentioned is also possible to integrating circuit or maintenance and sample circuit or other can receive string wave
Circuit, the present invention it is without restriction.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention, any technology people for being familiar with this profession
Member, without departing from the scope of the present invention, when the technology contents using the disclosure above make a little change or modification
For the equivalent embodiment of equivalent variations, but anything that does not depart from the technical scheme of the invention content, according to the technical essence of the invention
Any simple modification, equivalent change and modification to the above embodiments, all of which are still within the scope of the technical scheme of the invention.
Claims (8)
1. a kind of position detecting apparatus, characterized by comprising:
Touch screen includes a plurality of driving conductive bar and a plurality of sensing conductive bar；
Detecting unit is connected to a plurality of sensing conductive bar of the touch screen, includes:
Measurement circuit is simulated, receives the string wave from one of a plurality of sensing conductive bar, and in an at least period for string wave
Multiple predetermined phases measure the measurement signal of the simulation of string wave respectively, wherein the predetermined phase is continuous arrangement, adjacent phase
Interdigit differs identical phase difference, a plurality of sensing conductive bar first is that via with one or one group of drive being provided string wave
Moving conductive capacitive couplings provide the string wave；
Each measurement signal simulated is converted into the measurement signal of number by analog-to-digital circuit；And
Processor, the measurement signal of each number according at least period respectively multiplied by measurement when predetermined phase just
The product that string value generates generates the weighting measurement signal of the number in an at least period, and by at least period
The weighting measurement signal aggregation summation of all numbers is to generate complete measurement signal.
2. position detecting apparatus as described in claim 1, it is characterised in that digital weighting measurement signal is with the amount of number
It surveys signal and is multiplied by integer value to generate the product of number, and each sine value is to be multiplied by identical multiple to generate integer
Value.
3. position detecting apparatus as described in claim 1, it is characterised in that the phase difference is 60 degree.
4. a kind of position detecting apparatus, characterized by comprising:
Touch screen includes a plurality of driving conductive bar and a plurality of sensing conductive bar；
Detecting unit is connected to a plurality of sensing conductive bar of the touch screen, includes:
Measurement circuit is simulated, receives one of the string wave from a plurality of sensing conductive bar, and in an at least period for string wave
Multiple predetermined phases measure the measurement signal of the simulation of string wave respectively, wherein the predetermined phase is continuous arrangement, adjacent phase
Interdigit differs identical phase difference, a plurality of sensing conductive bar first is that via with one or one group of drive being provided string wave
Moving conductive capacitive couplings provide the string wave；
Amplifying circuit is produced according to the multiple of the sine value of predetermined phase when zooming into measurement by the measurement signal simulated respectively
The weighting measurement signal of a raw simulation；
Each weighting measurement signal simulated is converted into the weighting measurement signal of number by analog-to-digital circuit；And
Processor adds up the weighting measurement signal of all numbers in an at least period to generate complete measurement signal.
5. position detecting apparatus as claimed in claim 4, it is characterised in that the phase difference is 60 degree.
6. a kind of position detecting apparatus, characterized by comprising:
Touch screen includes a plurality of driving conductive bar and a plurality of sensing conductive bar；
Detecting unit is connected to a plurality of sensing conductive bar of the touch screen, includes:
Measurement circuit is simulated, receives the string wave from one of a plurality of sensing conductive bar, and in an at least period for string wave
Multiple predetermined phases measure the measurement signal of the simulation of string wave respectively, a plurality of sensing conductive bar first is that via with mentioned
The string wave is provided for one of string wave or one group of driving conductive bar capacitive couplings；
Amplifying circuit is produced according to the multiple of the sine value of predetermined phase when zooming into measurement by the measurement signal simulated respectively
The weighting measurement signal of a raw simulation；
The weighting of all simulations in an at least period is measured signal integration to generate the complete measurement of simulation by integrating circuit
Signal；And
Each complete measurement signal simulated is converted into the complete measurement signal of number by analog-to-digital circuit.
7. position detecting apparatus as claimed in claim 6, it is characterised in that the predetermined phase is continuous arrangement, adjacent phase
Interdigit differs identical phase difference.
8. position detecting apparatus as claimed in claim 7, it is characterised in that the phase difference is 60 degree.
Applications Claiming Priority (3)
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| US201261617196P | 2012-03-29 | 2012-03-29 | |
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| US8605054B2 (en) * | 2010-09-02 | 2013-12-10 | Texas Instruments Incorporated | Touch-sensitive interface and method using orthogonal signaling |
| US9086439B2 (en) * | 2011-02-25 | 2015-07-21 | Maxim Integrated Products, Inc. | Circuits, devices and methods having pipelined capacitance sensing |
| KR101239103B1 (en) * | 2011-04-19 | 2013-03-06 | 주식회사 동부하이텍 | Touch screen controller using differential signal manipulation |
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| TWI485611B (en) | 2015-05-21 |
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