CN106909257B - A kind of multiple spot actual touch method of surface acoustic wave touch screen - Google Patents
A kind of multiple spot actual touch method of surface acoustic wave touch screen Download PDFInfo
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- CN106909257B CN106909257B CN201710121204.4A CN201710121204A CN106909257B CN 106909257 B CN106909257 B CN 106909257B CN 201710121204 A CN201710121204 A CN 201710121204A CN 106909257 B CN106909257 B CN 106909257B
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; 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
- G06F3/043—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using propagating acoustic waves
- G06F3/0433—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using propagating acoustic waves in which the acoustic waves are either generated by a movable member and propagated within a surface layer or propagated within a surface layer and captured by a movable member
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; 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
- G06F3/043—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using propagating acoustic waves
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04104—Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
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- Position Input By Displaying (AREA)
- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
Abstract
The invention discloses a kind of multiple spot actual touch methods of surface acoustic wave touch screen, comprising the following steps: (1) one group of transmitting transducer arrays is at least arranged, in X-axis or Y-axis or receives transducer array；(2), transmitting transducer acoustic waves signal is driven by transmit circuit, energy converter receiving surface acoustic signals is received by reception circuit control；(3), when there is touch body to touch, surface acoustic wave signal reaches after being touched body reflection and receives energy converter, when surface acoustic wave signal intensity is greater than the threshold values of setting, circuit is received by the surface acoustic wave signal and is sent to central processing unit MCU, central processing unit MCU determines the coordinate for touching body.The present invention realizes the multiple spot actual touch response of two o'clock or more, has been inherently eliminated terrible point, and can be truly realized the unlimited touch response in touch area with existing technique.
Description
It is 2013.6.14 that the application, which is the applying date, application No. is 201310235013.2, a kind of entitled " realization
In the method for surface acoustic wave touch screen multiple spot actual touch " patent application patent divisional application.
Technical field
The present invention relates to the multiple spot actual touch of a kind of surface acoustic wave touch screen more particularly to a kind of surface acoustic wave touch screen
Method.
Background technique
Current touch screen mainly has the types such as surface acoustic wave, infrared and capacitor, wherein surface acoustic wave touch screen due to
Have many advantages, such as that high resolution, response time are short, environment adaptation is strong, stability is good, translucency is good, becomes several mainstream touch screens
In most promotional value touch screen.
Existing general surface acoustic wave touching screen only has X-axis and Y-axis two orthogonal physical positioning axis, is based on axis
Intersection principle can accurately identify a touch point and obtain unique one group of position coordinate data, but for two or more
Touch point simultaneously when operating, such as it is possible that the combinatorial coordinates of three or four positions when two touch points, wherein one
A or two positions combinatorial coordinates are ghost point coordinate, and leading to the touch point of report is not true touch point, this allows for table
Face acoustic wave touching screen will fail when multiple spot touches simultaneously, significantly limit the development of surface acoustic wave touch screen.
Therefore, it proposes to start with from software and hardware both direction respectively in the prior art and solve the above problems:
The first, from software, surface acoustic wave touch field touches firmware by upgrading, touches body when entering touch area
The detection of touch point two point, referred to as soft two point are implemented on software using time-sharing approach or zone method；
Wherein time-sharing approach require two touch bodies for the first time point touching region when must in different time points, two time points
Interval at least needs to differ a touch screen response time, such as 10.4ms, behind first touch body point touching region, touch system
First true touch point is detected, and records the true coordinate position of the touch point, second touch body is after 10.4ms
Any time click touch area after, one or two reference axis data at least can newly occur, such as an X-coordinate newly occur
Or when Y-coordinate, fixer system can be automatically emerging X-coordinate or the Y-coordinate or X-coordinate of Y-coordinate matching missing, the missing
Y-coordinate or X-coordinate from it is new there is an X-coordinate or Y-coordinate when first touch body reference axis data.If simultaneously
Newly there is an X-coordinate and Y-coordinate, fixer system automatically matches emerging X-coordinate and Y-coordinate, identifies
Two true touch points.But time-sharing approach is limited as when handling third touch body point touching region, and third touches
When body is located at the first two touch body crossover location, no new X-coordinate or Y coordinate data occur, and lead to not identify third touching
Touch body.
And zone method requires physically for touch screen to be partitioned into several regions, for example X-axis is divided into many zonules, leads to
It crosses judgement touch point and enters release corresponding region, distinguish true point from ghost point, such as in the prior art when two touch bodies
Point touching region simultaneously, and when two touch points are without identical X and Y coordinates axis, firmware can collect simultaneously two X-coordinate and
Two Y-coordinate match clock synchronization in X and Y, it may appear that two terrible points lead to not the actual position of two touch bodies of identification.But due to
Touch screen physical segmentation has been gone out many different zones by zone method, touches body when touch area is moved, two touch points
Can one in front and one in back into other regions, two true touch points can be distinguished from ghost point by this front and back time difference,
This principle is also similar to time-sharing approach.The critical defect of zone method is that multiple point touching can not be identified in same subregion, can not
The defect that identification third touches body still has, such as enters the second subregion simultaneously in two touch bodies of first subregion
Moment, third touch body also click the second subregion for the first time at the moment because two in the first subregion touch point without
Method identification, enter second subregion moment increase again third touch body, collect three different Y in the second subregion
Coordinate, two different X-coordinate, fixer system has six kinds of combinations when matching, wherein three kinds of groups are combined into terrible point.
Error rate is higher when zone method leads to multiple touch bodies because of not perfect in its principle in soft two point from the above,
It is very high to surface acoustic wave signal requirement in time-sharing approach other than the time interval touched for the first time to multi-touch body requires, cause
Surface acoustic wave touch screen is relatively difficult on realizing stable production.Such as in surface acoustic wave touch screen production, especially greatly
The surface acoustic wave touch screen of size, it is desirable that processing technology precision is higher, and striped silk-screen printing, baking temperature precision are higher, thus
Manufacture difficulty is increased, while the otherness between each surface acoustic wave touch screen is also larger, steady production surface acoustic wave is caused to touch
The difficulty for touching screen increases.
The second, from hardware, China Patent No. " 200920298621.7 " discloses a kind of multi-point surface acoustic wave touch
Screen, publication date are on 09 08th, 2010, and technical solution is that the multi-point surface acoustic wave touch screen includes controller, X
Axis positioning device and Y-axis positioning device, further include independent Z axis positioning device, and Z axis positioning device includes being arranged on screen body
Two Z axis transmitting transducers, two Z axis receive energy converter, two groups of Z axis transmitting striped arrays and two groups of Z axis and receive striped array,
Two groups of Z axis transmitting striped arrays and two groups of Z axis receive striped array distributions and enclose in screen body quadrangle at positioning, and shield body side with
Corresponding Z axis transmitting striped array or Z axis receive striped array parallel, and Z axis positioning device forms Z axis, and X-axis positioning device is formed
X-axis, Y-axis positioning device form Y-axis, and Z axis intersects with X-axis and Y-axis.
Increased in the patent one can assisting sifting ghost point Z axis, increase Z axis after can at most identify two physics simultaneously
Body is touched, one group of U axis vertical with Z axis is continued growing, can at most identify three physical touch bodies, therefore theoretically coordinate simultaneously
Axis has N group, so that it may while identifying N-1 physical touch body, but increasing reference axis group number need to also be in touch screen body surrounding increase phase
The reflection strip array answered, and surface acoustic wave signal generates many hash after multiple groups reflection strip array, and holds
It easily receives energy converter to be received, to seriously affect fixer system coordinate identification point, while increasing multiple groups reflection strip array need to
Broader touch screen body surrounding is wanted to meet the space layout demand of reflection strip array, this is light-duty with existing market demand
Change, narrow side, boundlessization and panelized touch screen are opposite and speed, and N group coordinate can not have also been produced with existing processing technology
The surface acoustic wave touch screen of axis.
Summary of the invention
It is an object of the invention to overcome the above-mentioned problems in the prior art, a kind of surface acoustic wave touch screen is provided
Multiple spot actual touch method, the present invention realize the multiple spot actual touch response of two o'clock or more, have been inherently eliminated terrible point,
And the unlimited touch response in touch area can be truly realized with existing technique.
To achieve the above object, The technical solution adopted by the invention is as follows:
A kind of multiple spot actual touch method of surface acoustic wave touch screen, which comprises the following steps:
(1), one group of transmitting transducer arrays formed by multiple transmitting transducers is at least set in X-axis or Y-axis, or extremely
One group of reception transducer array formed by multiple reception energy converters is set less；
(2), transmitting transducer acoustic waves signal is driven by transmit circuit, energy converter is received by reception circuit control
Receiving surface acoustic signals；
(3), when there is touch body to touch, surface acoustic wave signal reaches reception energy converter after being touched body reflection, works as surface
When acoustic signals intensity is greater than the threshold values of setting, circuit is received by the surface acoustic wave signal and is sent to central processing unit MCU, in
Central Processing Unit MCU determines the coordinate for touching body.
One group of transmitting transducer arrays is at least set in the X-axis, one group of reception transducer array is at least set in the Y-axis
Column drive all transmitting transducers acoustic waves signal simultaneously by transmit circuit；It is changed by all receptions of reception circuit control
Energy device while receiving surface acoustic signals, or successively independent receiving surface sound wave is believed by all reception energy converters of reception circuit control
Number.
When there is a touch body to touch, surface acoustic wave signal reaches after being touched 90 degree of body reflections and receives energy converter Yi,
Due to each relative position coordinates for receiving energy converter it is known that therefore the coordinate of the touch body in Y-axis is Yi, in X-axis
Coordinate are as follows: Xi=V*(ti-t0)-Yi；
When there is the touch of multiple touch bodies, surface acoustic wave signal reaches after being touched 90 degree of body reflections and receives energy converter,
In a reception energy converter YjMultiple surface acoustic wave signals are received, due to each relative position coordinates for receiving energy converter
Know, therefore multiple coordinates for touching body in Y-axis are Yj, the coordinate in X-axis is respectively as follows:
1st touch body: Xj1=V*(tj1-t0)-Yj；
2nd touch body: Xj2=V*(tj2-tj1)+Xj1Or Xj2=V*(tj2-t0)-Yj；
…………
N-th of touch body: Xjn=V*(tjn-tj1)+Xj1Or Xjn=V*(tjn-t0)-Yj；Wherein V is surface acoustic wave signal
Spread speed, t0Start the start time point of acoustic waves signal, t for transmitting transduceriIt is received for the first time to receive energy converter
To the time point of surface acoustic wave signal, tj1For YjReceive the time point of the surface acoustic wave signal of the 1st touch body, tj2For YjIt connects
Receive the time point of the surface acoustic wave signal of the 2nd touch body, tjnFor YjReceive the surface acoustic wave signal of n-th of touch body
Time point.
One group of transmitting transducer arrays is at least set in the X-axis, one group of reception transducer array is at least set in the Y-axis
Column, since any one transmitting transducer, transmitting transducer acoustic waves signal is successively operated alone by transmit circuit,
Until all transmitting transducers were all driven once, then terminate one cycle；By all reception energy converters of reception circuit control
Receiving surface acoustic signals simultaneously, or by all reception energy converters of reception circuit control successively independent receiving surface acoustic signals.
The sum of transmitting transducer is n, first transmitting transducer X in the transmitting transducer arrays1Persistently emit table
The start time point of face acoustic signals is t0, the time that each transmitting transducer continues acoustic waves signal is T, until
All transmitting transducers terminated one cycle after all being driven once, receive energy converter from start time point t0Start reception table
Face acoustic signals stop receiving surface acoustic signals after lasting n*T；
Within (n-1) * T~n*T period, n-th of transmitting transducer XnContinue acoustic waves signal, when there is touch body
When touch, surface acoustic wave signal reaches after being touched 90 degree of body reflections and receives energy converter Yn, due to each transmitting transducer and connect
The relative position coordinates of energy converter are received it is known that it is thus determined that the coordinate for touching body is (Xn, Yn).
One group of transmitting transducer arrays is at least set in the X-axis, is at least arranged one in the Y-axis and is changed by individually receiving
The combination that energy device and reflection strip array are formed successively is operated alone since any one transmitting transducer by transmit circuit
Transmitting transducer acoustic waves signal then terminated one cycle until all transmitting transducers are all driven once；By
It receives circuit control and receives energy converter receiving surface acoustic signals.
The sum of transmitting transducer is n, first transmitting transducer X in the transmitting transducer arrays1Persistently emit table
The start time point of face acoustic signals is t0, the time that each transmitting transducer continues acoustic waves signal is T, until
All transmitting transducers terminated one cycle after all being driven once, receive energy converter from start time point t0Start reception table
Face acoustic signals stop receiving surface acoustic signals after lasting n*T；
Within (n-1) * T~n*T period, n-th of transmitting transducer XnContinue acoustic waves signal, when there are multiple touchings
When touching body touch, surface acoustic wave signal reaches after being touched 90 degree of body reflections receives energy converter, and reception circuit receives the 1st table
The time point of face acoustic signals is tn1, the time point for receiving the 2nd surface acoustic wave signal is tn2, receive m-th of surface sound
The time point of wave signal is tnm, since the relative position coordinates of each transmitting transducer are it is known that therefore multiple touch bodies are in X-axis
Coordinate be Xn, the coordinate in Y-axis is respectively as follows:
1st touch body: Yn1={V*{tn1-[t0+(n-1)T]}-Xn}/2,
2nd touch body: Yn2={V*{tn2-[t0+(n-1)T]}-Xn}/2,
…………
M-th of touch body: Ynm={V*{tnm-[t0+(n-1)T]}-Xn}/2。
One combination formed by single transmitting transducer and reflection strip array, the Y-axis are at least set in the X-axis
On one group of reception transducer array is at least set, by transmit circuit driving transmitting transducer continue acoustic waves signal；By
All reception energy converters of circuit control receiving surface acoustic signals simultaneously are received, or by all reception energy converters of reception circuit control
Successively independent receiving surface acoustic signals.
When there is a touch body to touch, surface acoustic wave signal reaches after being touched 90 degree of body reflections and receives energy converter Yi,
Due to each relative position coordinates for receiving energy converter it is known that therefore the coordinate of the touch body in Y-axis is Yi, in X-axis
Coordinate are as follows: Xi= [V*(ti-t0)-Yi]/2；
When there is the touch of multiple touch bodies, surface acoustic wave signal reaches after being touched 90 degree of body reflections and receives energy converter,
In a reception energy converter YjMultiple surface acoustic wave signals are received, due to each relative position coordinates for receiving energy converter
Know, therefore multiple coordinates for touching body in Y-axis are Yj, the coordinate in X-axis is respectively as follows:
1st touch body: Xj1=[V*(tj1-t0)-Yj]/2；
2nd touch body: Xj2=[V*(tj2-tj1)]/2+Xj1Or Xj2=[V*(tj2-t0)-Yj]/2；
…………
N-th of touch body: Xjn=[V*(tjn-tj1)]/2+Xj1Or Xjn=[V*(tjn-t0)-Yj]/2。
One group of transmitting transducer arrays and one group of reception energy converter are respectively set on a wherein edge for the X-axis or Y-axis
Array drives all transmitting transducers acoustic waves signal simultaneously by transmit circuit；By all receptions of reception circuit control
Energy converter receiving surface acoustic signals simultaneously, or by all reception energy converters of reception circuit control successively independent receiving surface sound wave
Signal.
When there is a touch body to touch, surface acoustic wave signal reaches after being touched the reflection of body 180 degree and receives energy converter Yi,
Due to each relative position coordinates for receiving energy converter it is known that therefore the coordinate of the touch body in Y-axis is Yi, in X-axis
Coordinate are as follows: Xi= V*(ti-t0)/2；
When there is the touch of multiple touch bodies, surface acoustic wave signal reaches after being touched the reflection of body 180 degree and receives energy converter,
In a reception energy converter YjMultiple surface acoustic wave signals are received, due to each relative position coordinates for receiving energy converter
Know, therefore multiple coordinates for touching body in Y-axis are Yj, the coordinate in X-axis is respectively as follows:
1st touch body: Xj1=V*(tj1-t0)/2；
2nd touch body: Xj2=V*(tj2-tj1)/2+Xj1Or Xj2=V*(tj2-t0)/2；
…………
N-th of touch body: Xjn= [V*(tjn-tj1)]/2+Xj1Or Xjn=V*(tjn-t0)/2。
One group of transmitting transducer arrays and one group of reception energy converter are respectively set on a wherein edge for the X-axis or Y-axis
Transmitting transducer acoustic waves letter is successively operated alone by transmit circuit since any one transmitting transducer for array
Number, until all transmitting transducers were all driven once, then terminate one cycle；By all reception transducings of reception circuit control
Device while receiving surface acoustic signals, or successively independent receiving surface sound wave is believed by all reception energy converters of reception circuit control
Number.
The sum of transmitting transducer is n, first transmitting transducer X in the transmitting transducer arrays1Persistently emit table
The start time point of face acoustic signals is t0, the time that each transmitting transducer continues acoustic waves signal is T, until
All transmitting transducers terminated one cycle after all being driven once, receive energy converter from start time point t0Start reception table
Face acoustic signals stop receiving surface acoustic signals after lasting n*T；
Within (n-1) * T~n*T period, n-th of transmitting transducer XnContinue acoustic waves signal, when there is a touching
When touching body touch, surface acoustic wave signal reaches after being touched the reflection of body 180 degree and receives energy converter Yn, due to each transmitting transducer
Relative position coordinates with reception energy converter are it is known that it is thus determined that the coordinate of the touch body is (Xn, Yn)；When there is multiple touch bodies
When touch, multiple coordinates for touching body in X-axis are Xn, the coordinate in Y-axis is respectively as follows:
1st touch body: Yj1=V*(tj1-t0)/2；
2nd touch body: Yj2=V*(tj2-tj1)/2+Yj1Or Yj2=V*(tj2-t0)/2；
…………
N-th of touch body: Yjn=[V*(tjn-tj1)]/2+Yj1Or Yjn=V*(tjn-t0)/2。
One group of transmitting transducer arrays and one are respectively set on a wherein edge for the X-axis or Y-axis by individually receiving
The combination that energy converter and reflection strip array are formed successively individually is driven since any one transmitting transducer by transmit circuit
Dynamic transmitting transducer acoustic waves signal then terminated one cycle until all transmitting transducers are all driven once；
Energy converter receiving surface acoustic signals are received by reception circuit control.
The sum of transmitting transducer is n, first transmitting transducer X in the transmitting transducer arrays1Persistently emit table
The start time point of face acoustic signals is t0, the time that each transmitting transducer continues acoustic waves signal is T, until
All transmitting transducers terminated one cycle after all being driven once, receive energy converter from start time point t0Start reception table
Face acoustic signals stop receiving surface acoustic signals after lasting n*T；
Within (n-1) * T~n*T period, n-th of transmitting transducer XnContinue acoustic waves signal, when there are multiple touchings
When touching body touch, surface acoustic wave signal reaches after being touched the reflection of body 180 degree receives energy converter, and reception circuit receives the 1st
The time point of surface acoustic wave signal is tn1, the time point for receiving the 2nd surface acoustic wave signal is tn2, receive m-th of surface
The time point of acoustic signals is tnm, since the relative position coordinates of each transmitting transducer are it is known that therefore multiple touch bodies are in X-axis
On coordinate be Xn, the coordinate in Y-axis is respectively as follows:
1st touch body: Yn1= V*{{tn1-[t0+(n-1)T]}-Xn}/2,
2nd touch body: Yn2={V*{tn2-[t0+(n-1)T]}-Xn}/2,
…………
M-th of touch body: Ynm={V*{tnm-[t0+(n-1)T]}-Xn}/2。
One group of reception transducer array and one are respectively set on a wherein edge for the X-axis or Y-axis by individually emitting
The combination that energy converter and reflection strip array are formed continues acoustic waves signal by transmit circuit driving transmitting transducer；
By all reception energy converters of reception circuit control while receiving surface acoustic signals, or by all reception transducings of reception circuit control
Device successively independent receiving surface acoustic signals.
When there is a touch body to touch, surface acoustic wave signal reaches after being touched the reflection of body 180 degree and receives energy converter Yi,
Due to each relative position coordinates for receiving energy converter it is known that therefore the coordinate of the touch body in Y-axis is Yi, in X-axis
Coordinate are as follows: Xi= [V*(ti-t0)-Yi]/2；
When there is the touch of multiple touch bodies, surface acoustic wave signal reaches after being touched the reflection of body 180 degree and receives energy converter,
In a reception energy converter YjMultiple surface acoustic wave signals are received, due to each relative position coordinates for receiving energy converter
Know, therefore multiple coordinates for touching body in Y-axis are Yj, the coordinate in X-axis is respectively as follows:
1st touch body: Xj1=[V*(tj1-t0)-Yj]/2；
2nd touch body: Xj2=[V*(tj2-tj1)+Xj1]/2 or Xj2= [V*(tj2-t0)-Yj]/2；
…………
N-th of touch body: Xjn=[V*(tjn-tj1)+Xj1]/2 or Xjn=[V*(tjn-t0)-Yj]/2。
One group of transmitting transducer arrays and one group of reception energy converter are respectively set on a wherein edge for the X-axis or Y-axis
One group of transmitting transducer arrays and one group of reception transducer array are respectively set on a wherein edge for array, the Y-axis or X-axis
Column.
Reception transducer array in the X-axis or Y-axis or by individually receiving energy converter and reflection strip array formed
Transmitting terminal of the combination settings in surface acoustic wave signal.
In acoustic waves signal, remaining transmitting transducer does not work any one described transmitting transducer.
Using the present invention has the advantages that
One, one group of transmitting transducer battle array formed by multiple transmitting transducers is at least arranged in the present invention in X-axis or Y-axis
Column, or one group of reception transducer array formed by multiple reception energy converters is at least set, since transmitting transducer or reception change
Can device relative position coordinates it is known that therefore the structure can not only effectively tell it is multiple touch bodies true touch points,
Can also quickly determine that multiple touch bodies in X-axis or the coordinate in Y-axis, have been inherently eliminated terrible point, realize two o'clock and
Above multiple spot actual touch response has been truly realized the unlimited touch response in touch area；With China Patent No.
" 200920298621.7 " are that the prior art of representative is compared, and design of the invention is simple, the received letter of surface acoustic wave touch screen
It is number strong, it touches performance and stablizes, matching circuit design does not need complicated filtering and Dolby circuit design, not only simplifies
The Material Cost of circuit also reduces the design difficulty of printed circuit；The component that the present invention uses simultaneously is at low cost, produces work
Skill is mature, produces surface acoustic wave touch screen with being conducive to stable mass.
Two, in the present invention, transmitting transducer arrays are conducive to raising table by the way of acoustic waves signal simultaneously
The intensity of face acoustic signals simplifies the design of transmit circuit switch and reduces more valve chip demands；Transmitting transducer arrays are adopted
With the mode of successively independent acoustic waves signal, it can effectively reduce interfering with each other between multiple touch bodies, improve and touch letter
Number stability, can not only reduce energy consumption, additionally it is possible to extend the service life of transmitting transducer；Transducer array is received using same
When receiving surface acoustic signals mode, the time of receiving surface acoustic signals can be reduced, be conducive to improve touch-responsive speed
Degree；And energy converter is received by the way of timesharing receiving surface acoustic signals, it can reduce the interference of surface acoustic wave signal, favorably
Stability is touched in improving.
Three, in the present invention, using the combination acoustic waves formed by single transmitting transducer and reflection strip array
Signal by reception transducer array receiving surface acoustic signals, or uses transmitting transducer arrays acoustic waves signal,
By the combination receiving surface acoustic signals formed by individually receiving energy converter and reflection strip array, can efficiently identify
While multiple point touching, energy converter usage quantity is also reduced, production cost is reduced, especially can quickly position and be changed from transmitting
The coordinate of the close touch body of energy device, improves touch-responsive speed.
Four, in the present invention, in perpendicular two side of touch screen body, one group of transmitting transducing is respectively set in each edge
Device array and one group of reception transducer array can be improved the intensity of surface acoustic wave signal, and build in entire touch screen body surface face
Uniform acoustic wavefield is found, is conducive to improve the stability touched；Surface acoustic wave signal is stronger simultaneously, and it is steady to be more conducive to touch function
It is qualitatively promoted, and touching intensity (abbreviation touch feeling) is also lighter；Terrible point can be inherently eliminated using this design, from
And improve the accuracy of touch point location determination；And two groups of reception transducer arrays then make the detection of surface acoustic wave signal cleverer
Quick, testing result is more acurrate.
Five, in the present invention, reception transducer array in the X-axis or Y-axis or by individually receiving energy converter and reflection bar
For the combination settings that line array is formed in the transmitting terminal of surface acoustic wave signal, this structure advantageously reduces reflecting rear face acoustic signals
Propagation path, reduce the decaying of surface acoustic wave signal.
Six, in the present invention, any one described transmitting transducer is in acoustic waves signal, remaining transmitting transducing
Device does not work, and can either reduce energy consumption, energy saving, and can reduce the working time of transmitting transducer, is conducive to extend table
The service life of face acoustic wave touching screen.
Seven, in the present invention, when having, when touching body touch, the surface acoustic wave signal received is converted into data by reception circuit
Packet, will be sorted data packet with receiving time, and temporally the period is sent to central processing unit MCU, central processing unit MCU system
Raise processing each driving circuit launch time, receiving time of surface acoustic wave signal etc., can accomplish edge emitting, while receive, while at
Reason, can effectively shorten the waiting time, improve the response speed of surface acoustic wave touch screen.
Detailed description of the invention
Fig. 1 is the working principle diagram of the embodiment of the present invention 1.
Fig. 2 is the work flow diagram of the embodiment of the present invention 1.
Fig. 3 is the structural schematic diagram of the embodiment of the present invention 1.
Fig. 4 is the working time figure of emission shaft in the embodiment of the present invention 1.
Fig. 5 is the working time figure of receiving axis in the embodiment of the present invention 1.
Fig. 6 is the circuit block diagram of the embodiment of the present invention 1.
Fig. 7 is the working principle diagram of the embodiment of the present invention 2.
Fig. 8 is the work flow diagram of the embodiment of the present invention 2.
Fig. 9 is the operation schematic diagram of the embodiment of the present invention 2.
Figure 10 is the working time figure of emission shaft in the embodiment of the present invention 2.
Figure 11 is the working time figure of receiving axis in the embodiment of the present invention 2.
Figure 12 is the working principle diagram of the embodiment of the present invention 3.
Figure 13 is the work flow diagram of the embodiment of the present invention 3.
Figure 14 is the structural schematic diagram of the embodiment of the present invention 3.
Figure 15 is the working time figure of emission shaft in the embodiment of the present invention 3.
Figure 16 is the working time figure of receiving axis in the embodiment of the present invention 3.
Figure 17 is the structural schematic diagram of the embodiment of the present invention 4.
Figure 18 is the working time figure of emission shaft in the embodiment of the present invention 4.
Figure 19 is the working time figure of receiving axis in the embodiment of the present invention 4.
Figure 20 is the structural schematic diagram of the embodiment of the present invention 5.
Figure 21 is the structural schematic diagram of the embodiment of the present invention 6.
Figure 22 is the structural schematic diagram of the embodiment of the present invention 7.
Figure 23 is the structural schematic diagram of the embodiment of the present invention 8.
Label in figure are as follows: 1, touch screen body, 2, reception energy converter, 3, reflection strip array, 4, transmitting transducer arrays,
5, transducer array, 6, transmitting transducer are received.
Specific embodiment
Embodiment 1
A kind of multiple spot actual touch method of surface acoustic wave touch screen, comprising the following steps:
(1), one group of transmitting transducer arrays 4 formed by multiple transmitting transducers 6 is at least set in X-axis or Y-axis, or
One group of reception transducer array 5 formed by multiple reception energy converters 2 is at least set；
(2), 6 acoustic waves signal of transmitting transducer is driven by transmit circuit, transducing is received by reception circuit control
2 receiving surface acoustic signals of device；
(3), when there is touch body to touch, surface acoustic wave signal reaches after touching body receives energy converter 2, works as surface acoustic wave
When signal strength is greater than the threshold values of setting, circuit is received by the surface acoustic wave signal and is sent to central processing unit MCU, centre
It manages unit MCU and determines the coordinate for touching body.
Further, when not having to touch body touch, central processing unit MCU is with no treatment.
In the present embodiment, when having, when touching body touch, high density, the surface acoustic wave signal of high-energy are saturating through touch body generation
It penetrates, scatter, reflect and reflects, wherein the energy reflected is divided into after 180 degree reflects in backtracking to transmitting transducer 6,90 degree
The vertical axis is reached after reaching the axis and other angles reflection vertical with emission shaft after reflection, but is shown by test
Because most short from the vertical range for touching body arrival emission shaft or the axis vertical with emission shaft, the energy intensities of 90 degree of reflections
Energy is the largest on the axis vertical with emission shaft, while the energy intensity of 180 degree reflection is on the emission shaft
Energy is also the largest, therefore when the surface acoustic wave signal intensity that reception circuit receives is greater than the threshold values of setting, receives electricity
The surface acoustic wave signal is sent to central processing unit MCU by road, and central processing unit MCU determines the coordinate for touching body.
In the present embodiment, the transmitting transducer arrays 4 refer to by multiple transmitting transducers 6 in X-axis or Y-axis by straight line
Sequence arranges, and the transmitting transducer 6 in the transmitting transducer arrays 4 is arranged in parallel；The reception transducer array 5 refer to by
Multiple reception energy converters 2 are arranged in Y-axis or X-axis by linear sequence, the reception energy converter 2 received in transducer array 5
It is arranged in parallel.
In the present embodiment, replaced using transducer array 5 is received now with individually receiving energy converter 2 and reflection bar in technology
The composite structure that line array 3 is formed, using the replacement of transmitting transducer arrays 4 now with transmitting transducer 6 single in technology and instead
The composite structure for penetrating the formation of striped array 3 can be inherently eliminated terrible point, realize that the multiple spot actual touch of two o'clock or more is rung
It answers.
In the present embodiment, one group of transmitting transducer arrays 4 is preferably set in the X-axis, one group is arranged in the Y-axis
Transducer array 5 is received, all transmitting transducers 6 acoustic waves signal simultaneously is driven by transmit circuit；By reception circuit
All reception energy converters 2 receiving surface acoustic signals simultaneously are controlled, or successively single by all reception energy converters 2 of reception circuit control
Only receiving surface acoustic signals；But it is not limited to above-mentioned preferred arrangement, such as two groups of transmittings can be set in X-axis and changed
Energy device array 4, is arranged two groups of reception transducer arrays 5 in Y-axis.
When there is a touch body to touch, surface acoustic wave signal reaches after being touched 90 degree of body reflections and receives energy converter Yi,
Due to each relative position coordinates for receiving energy converter 2 it is known that therefore the coordinate of the touch body in Y-axis is Yi, in X-axis
Coordinate are as follows: Xi=V*(ti-t0)-Yi；
When there is the touch of multiple touch bodies, surface acoustic wave signal reaches after being touched 90 degree of body reflections and receives energy converter 2,
In a reception energy converter YjMultiple surface acoustic wave signals are received, due to each relative position coordinates for receiving energy converter 2
Know, therefore multiple coordinates for touching body in Y-axis are Yj, the coordinate in X-axis is respectively as follows:
1st touch body: Xj1=V*(tj1-t0)-Yj；
2nd touch body: Xj2=V*(tj2-t j1)+Xj1Or Xj2=V*(tj2-t0)-Yj；
…………
N-th of touch body: Xjn=V*(tjn-tj1)+Xj1Or Xjn=V*(tjn-t0)-Yj；Wherein V is surface acoustic wave signal
Spread speed, t0Start the start time point of acoustic waves signal, t for transmitting transducer 6iIt is connect for the first time to receive energy converter 2
Receive the time point of surface acoustic wave signal, tj1For YjReceive the time point of the surface acoustic wave signal of the 1st touch body, tj2For Yj
Receive the time point of the surface acoustic wave signal of the 2nd touch body, tjnFor YjReceive the surface acoustic wave signal of n-th of touch body
Time point.
In the present embodiment, as shown in Figure 1, T ' is that central processing unit MCU processing receives surface sound received by circuit
The time of wave signal, i.e. transmitting transducer 6 continue the time T of acoustic waves signal when being zero, stop acoustic waves
Signal, central processing unit MCU processing in time T ' receive surface acoustic wave signal received by circuit.
Embodiment 2
The present embodiment is substantially the same manner as Example 1, and the main distinction is: one group of transmitting transducer battle array being arranged in the X-axis
One group of reception transducer array 5 is arranged in the Y-axis, since any one transmitting transducer 6, successively by transmit circuit in column 4
6 acoustic waves signal of transmitting transducer is operated alone, until all transmitting transducers 6 were all driven once, then terminates
One cycle；By all reception energy converters 2 of reception circuit control while receiving surface acoustic signals, or by reception circuit control institute
Have and receives the successively independent receiving surface acoustic signals of energy converter 2；Above-mentioned set-up mode is preferred, but is not limited to above-mentioned preferred
Set-up mode, such as one group of transmitting transducer arrays 4 can be set in X-axis, two groups of reception transducer arrays are set in Y-axis
5。
Further, the sum of transmitting transducer 6 is n, first transmitting transducer X in the transmitting transducer arrays 41
The start time point for continuing acoustic waves signal is t0, each transmitting transducer 6 continues acoustic waves signal
Time is T, terminates one cycle after all transmitting transducers 6 are all driven once, receives energy converter 2 from initial time
Point t0Start receiving surface acoustic signals, stops receiving surface acoustic signals after lasting n*T；
Within (n-1) * T~n*T period, n-th of transmitting transducer XnContinue acoustic waves signal, when there is touch body
When touch, surface acoustic wave signal reaches after being touched 90 degree of body reflections and receives energy converter Yn, due to each transmitting transducer 6 and connect
The relative position coordinates of energy converter 2 are received it is known that it is thus determined that the coordinate for touching body is (Xn, Yn).
The working principle of the present embodiment are as follows: the transmitting transducer 6 first in setting transmitting transducer arrays 4 successively presses X1、
X2、X3……XmArrangement, the reception energy converter 2 received in transducer array 5 successively press Y1、Y2、Y3……YnArrangement, then by sending out
Transmitting transducer X is operated alone in transmit-receive radio road1Continue acoustic waves signal in setting time T, and start countdown, emits
Energy converter X1Coordinate it is pre-recorded by central processing unit MCU, when have touch body touch when, detection receive energy converter Y1It is connect
Whether the energy intensity for receiving surface acoustic wave signal is greater than setting threshold values, if receiving energy converter Y1Received surface acoustic wave letter
Number energy intensity be greater than setting threshold values, then be determined as true value 1, indicate touch body, and recorded and connect by central processing unit MCU
Receive energy converter Y1Coordinate, if receive energy converter Y1The energy intensity of received surface acoustic wave signal is less than setting threshold values, then
It is determined as falsity 0, indicates that no touch body, central processing unit MCU do not do any record；It completes to receive energy converter Y1Detection
Afterwards, it is sequentially completed the remaining detection for receiving energy converter 2, after completing all detections for receiving energy converter 2, receives circuit for sound
The surface acoustic wave signal that wave signal receiving assembly receives adds the time at data packet, and to data packet by A/D circuit conversion
Label, then by data packet, temporally the period is sent to central processing unit MCU and handles, true by central processing unit MCU
Surely the coordinate for touching body is (X1, Y1), it and so on carries out, until transmitting transducer 6 all in X-axis was all driven, completes
After one cycle, receives circuit and stop receiving surface acoustic signals, wait the instruction recycled next time.
As shown in figure 9, central processing unit MCU drives transmitting transducer X by transmit circuit1When, surface acoustic wave is along Y
Axis direction propagate, when encounter touch body A when, high density, high-energy surface acoustic wave signal through touch body A occur 90 degree reflect,
Except reception energy converter Y8In addition, other receive the also different degrees of energy for having received surface acoustic wave signal and being reflected of energy converters 2
Amount, but only receive energy converter Y8The energy intensity of the surface acoustic wave signal received is greater than setting threshold values, therefore terminates in Y-axis
After scanning, only one peak value Y in Y-axis can be determined8, then can be determined that with the presence of a true touch point, i.e. (X1、Y8).
After completing all surface acoustic wave signal detections for receiving energy converter 2, transmit circuit stops driving transmitting transducer X1,
And transmitting transducer X is operated alone2, surface acoustic wave signal is propagated along Y direction, when encountering touch body B and C, surface sound
Wave signal is touched body and 90 degree of reflections occurs, and the Energy maximum value after reflection is respectively by Y5And Y3It receives, not the ground of touch point
Side is not in reflection, is naturally also received with regard to noenergy, and after Y-axis terminates scanning, there are two peak value Y5And Y3, then can
To determine that there are two true touch points to exist, i.e. (X2、Y5) and (X2、Y3).
Transmit circuit stops driving transmitting transducer X2Afterwards, transmitting transducer X is operated alone3, surface acoustic wave signal is along Y
Axis direction is propagated, but touch body is encountered, and the reception transducer array 5 of Y-axis does not all receive signal, therefore without peak value, X3
Without true touch point.
Transmit circuit stops driving transmitting transducer X3Afterwards, transmitting transducer X is operated alone4, surface acoustic wave signal is along Y
Axis direction is propagated, and when encountering touch body D, E and F, the Energy maximum values of 90 degree of reflections are respectively by Y5、Y7And Y9It receives, does not have
The place of touch point be not in reflection, although touch body D 90 degree of directions with the presence of a touch body B, according to surface sound
Wave transmission principle, 90% energy of surface acoustic wave signal is all transmission, therefore the presence of B will not influence 90 degree of reflected energies of D
Transmission nor affect on it since the amplitude of the reflected energy of the Amplitude Ratio other angles of 90 degree of reflected energies is several times greater
The amplitude difference of his angle reflected energy.So there are three peak value Y after Y-axis terminates scanning5、Y7And Y9, then can be determined that
There are three true touch points to exist, i.e. (X4、Y5), (X4、Y7) and (X4、Y9).
Transmit circuit stops driving transmitting transducer X4Afterwards, transmitting transducer X is operated alone5, surface acoustic wave signal is along Y
Axis direction is propagated, but touch body is encountered, and the reception transducer array 5 of Y-axis does not all receive signal, therefore without peak value, X5
Without true touch point.
Transmit circuit stops driving transmitting transducer X5Voltage after, transmitting transducer X is operated alone6, surface acoustic wave signal
It is propagated along Y direction, when encountering touch body G, the Energy maximum values of 90 degree of reflections are by Y3It receives, although touching body G's
90 degree of directions mention C with the presence of a touch, but do not influence the judgement of peak value, after Y-axis terminates scanning, there is a peak value Y3, because
This can be determined that with the presence of a true touch point, i.e. (X6、Y3).
Embodiment 3
The present embodiment is substantially the same manner as Example 2, and the main distinction is: one group of transmitting transducer battle array being arranged in the X-axis
Column 4, setting one combination formed by individually receiving energy converter 2 and reflection strip array 3 in the Y-axis, from any one hair
The beginning of energy converter 6 is penetrated, 6 acoustic waves signal of transmitting transducer is successively operated alone by transmit circuit, until all transmittings
Energy converter 6 was all driven once, then terminated one cycle；2 receiving surface sound wave of energy converter letter is received by reception circuit control
Number；Above-mentioned set-up mode is preferred, but is not limited to above-mentioned preferred arrangement, such as can be in two Bian Shangfen of X-axis
Two groups of transmitting transducer arrays 4 are not set, two are respectively set on two sides of Y-axis by individually receiving energy converter 2 and reflection
The combination that striped array 3 is formed.
Further, the sum of transmitting transducer 6 is n, first transmitting transducer X in the transmitting transducer arrays 41
The start time point for continuing acoustic waves signal is t0, each transmitting transducer 6 continues acoustic waves signal
Time is T, terminates one cycle after all transmitting transducers 6 are all driven once, receives energy converter 2 from initial time
Point t0Start receiving surface acoustic signals, stops receiving surface acoustic signals after lasting n*T；
Within (n-1) * T~n*T period, n-th of transmitting transducer XnContinue acoustic waves signal, when there are multiple touchings
When touching body touch, surface acoustic wave signal reaches after being touched 90 degree of body reflections receives energy converter 2, and reception circuit receives the 1st
The time point of surface acoustic wave signal is tn1, the time point for receiving the 2nd surface acoustic wave signal is tn2, receive m-th of surface
The time point of acoustic signals is tnm, since the relative position coordinates of each transmitting transducer 6 are it is known that therefore multiple touch bodies are in X
Coordinate on axis is Xn, the coordinate in Y-axis is respectively as follows:
1st touch body: Yn1={V*{tn1-[t0+(n-1)T]}-Xn}/2,
2nd touch body: Yn2={V*{tn2-[t0+(n-1)T]}-Xn}/2,
…………
M-th of touch body: Ynm={V*{tnm-[t0+(n-1)T]}-Xn}/2。
The working principle of the present embodiment and the working principle of embodiment 2 are essentially identical, and the main distinction is: to any one
Transmitting transducer XiWhen being driven, transmitting transducer XiThe surface acoustic wave signal of transmitting is parallel to Y direction, transmitting transducer
XiOn touch body make surface acoustic wave signal generate 90 degree reflect after propagate to reflection strip array 3, after reflection strip array 3
90 degree of deflection rear surface acoustic signals occur to conduct to energy converter 2 is received, then unify to carry out acoustic-electric turn by reception energy converter 2
It changes.Obviously, all surface acoustic signals all live through one section by X after 90 degree of reflectionsiVertically between reflection strip array 3
Distance, difference is arrived first after reflection strip array 3 two times turn to close to the surface acoustic wave signal for receiving energy converter 2 only
Up to energy converter 2 is received, energy converter 2 is received far from reaching after the surface acoustic wave signal for receiving energy converter 2, the present embodiment, which eliminates, to be connect
Transducer array 5 is received, the production cost of surface acoustic wave touch screen is reduced, is conducive to mass production.
Embodiment 4
The present embodiment is substantially the same manner as Example 1, and the main distinction is: being arranged one in the X-axis and is changed by individually receiving
Can the combination that is formed of device 2 and reflection strip array 3, one group of reception transducer array 5 is set in the Y-axis, is driven by transmit circuit
Dynamic transmitting transducer 6 continues acoustic waves signal；By all reception energy converters 2 of reception circuit control while receiving surface sound
Wave signal, or by all reception energy converters 2 of reception circuit control successively independent receiving surface acoustic signals；Above-mentioned set-up mode is
It is preferred that but be not limited to above-mentioned preferred arrangement, such as two can be respectively set by individually connecing on two sides of X-axis
The combination that energy converter 2 and reflection strip array 3 are formed is received, two groups of reception energy converters can be respectively set on two sides of Y-axis
Array 5.
Further, when there is a touch body to touch, surface acoustic wave signal is reached after being touched 90 degree of body reflections and is received
Energy converter Yi, due to each relative position coordinates for receiving energy converter 2 it is known that therefore the coordinate of the touch body in Y-axis is Yi,
Coordinate in X-axis are as follows: Xi= [V*(ti-t0)-Yi]/2；
When there is the touch of multiple touch bodies, surface acoustic wave signal reaches after being touched 90 degree of body reflections and receives energy converter 2,
In a reception energy converter YjMultiple surface acoustic wave signals are received, due to each relative position coordinates for receiving energy converter 2
Know, therefore multiple coordinates for touching body in Y-axis are Yj, the coordinate in X-axis is respectively as follows:
1st touch body: Xj1=[V*(tj1-t0)-Yj]/2；
2nd touch body: Xj2=[V*(tj2-tj1)]/2+Xj1Or Xj2=[V*(tj2-t0)-Yj]/2；
…………
N-th of touch body: Xjn=[V*(tjn-tj1)]/2+Xj1Or Xjn=[V*(tjn-t0)-Yj]/2。
Embodiment 5
The present embodiment is substantially the same manner as Example 1, and the main distinction is: on a wherein edge for the X-axis or Y-axis respectively
One group of transmitting transducer arrays 4 and one group of reception transducer array 5 are set, drive all transmitting transducers 6 same by transmit circuit
When acoustic waves signal；By all reception energy converters 2 of reception circuit control while receiving surface acoustic signals, or by receiving
All reception energy converters 2 of circuit control successively independent receiving surface acoustic signals.
Further, preferred forms are that reception transducer array 5 is parallel with transmitting transducer arrays 4, and receives and change
The transmitting terminal of surface acoustic wave signal is arranged in energy device array 5.
When there is a touch body to touch, surface acoustic wave signal reaches after being touched the reflection of body 180 degree and receives energy converter Yi,
Due to each relative position coordinates for receiving energy converter 2 it is known that therefore the coordinate of the touch body in Y-axis is Yi, in X-axis
Coordinate are as follows: Xi= V*(ti-t0)/2；
When there is the touch of multiple touch bodies, surface acoustic wave signal reaches after being touched the reflection of body 180 degree and receives energy converter 2,
It is one of to receive energy converter YjMultiple surface acoustic wave signals are received, due to each relative position coordinates for receiving energy converter 2
It is known that therefore multiple coordinates for touching body in Y-axis are Yj, the coordinate in X-axis is respectively as follows:
1st touch body: Xj1=V*(tj1-t0)/2；
2nd touch body: Xj2=V*(tj2-tj1)/2+Xj1Or Xj2=V*(tj2-t0)/2；
…………
N-th of touch body: Xjn= [V*(tjn-tj1)]/2+Xj1Or Xjn=V*(tjn-t0)/2。
Embodiment 6
The present embodiment is substantially the same manner as Example 5, and the main distinction is: on a wherein edge for the X-axis or Y-axis respectively
One group of transmitting transducer arrays 4 and one group of reception transducer array 5 are set, since any one transmitting transducer 6, by emitting
6 acoustic waves signal of transmitting transducer is successively operated alone in circuit, until all transmitting transducers 6 were all driven one
It is secondary, then terminate one cycle；By all reception energy converters 2 of reception circuit control while receiving surface acoustic signals, or by receiving
All reception energy converters 2 of circuit control successively independent receiving surface acoustic signals.
The sum of transmitting transducer 6 is n, first transmitting transducer X in the transmitting transducer arrays 41Lasting transmitting
The start time point of surface acoustic wave signal is t0, the time that each transmitting transducer 6 continues acoustic waves signal is T,
Terminate one cycle after all transmitting transducers 6 are all driven once, and receives energy converter 2 from start time point t0Start
Receiving surface acoustic signals stop receiving surface acoustic signals after lasting n*T；
Within (n-1) * T~n*T period, n-th of transmitting transducer XnContinue acoustic waves signal, when there is a touching
When touching body touch, surface acoustic wave signal reaches after being touched the reflection of body 180 degree and receives energy converter Yn, due to each transmitting transducer
6 and receive energy converter 2 relative position coordinates it is known that it is thus determined that the coordinate of the touch body be (Xn, Yn)；When there is multiple touches
When body touches, multiple coordinates for touching body in X-axis are Xn, the coordinate in Y-axis is respectively as follows:
1st touch body: Yj1=V*(tj1-t0)/2；
2nd touch body: Yj2=V*(tj2-tj1)/2+Yj1Or Yj2=V*(tj2-t0)/2；
…………
N-th of touch body: Yjn=[V*(tjn-tj1)]/2+Yj1Or Yjn=V*(tjn-t0)/2。
Embodiment 7
The present embodiment is substantially the same manner as Example 6, and the main distinction is: on a wherein edge for the X-axis or Y-axis respectively
The combination that one group of transmitting transducer arrays 4 and one are formed by individually receiving energy converter 2 and reflection strip array 3 is set, from appointing
Transmitting transducer 6 of anticipating starts, and 6 acoustic waves signal of transmitting transducer is successively operated alone by transmit circuit, until
All transmitting transducers 6 were all driven once, then terminated one cycle；Energy converter 2 is received by reception circuit control and receives table
Face acoustic signals.
Further, preferred forms are to be set by individually receiving the combination that energy converter 2 is formed with reflection strip array 3
Set the transmitting terminal in surface acoustic wave signal.
The sum of transmitting transducer 6 is n, first transmitting transducer X in the transmitting transducer arrays 41Lasting transmitting
The start time point of surface acoustic wave signal is t0, the time that each transmitting transducer 6 continues acoustic waves signal is T,
Terminate one cycle after all transmitting transducers 6 are all driven once, and receives energy converter 2 from start time point t0Start
Receiving surface acoustic signals stop receiving surface acoustic signals after lasting n*T；
Within (n-1) * T~n*T period, n-th of transmitting transducer XnContinue acoustic waves signal, when there are multiple touchings
When touching body touch, surface acoustic wave signal reaches after being touched the reflection of body 180 degree receives energy converter 2, and reception circuit receives the 1st
The time point of surface acoustic wave signal is tn1, the time point for receiving the 2nd surface acoustic wave signal is tn2, receive m-th of surface
The time point of acoustic signals is tnm, since the relative position coordinates of each transmitting transducer 6 are it is known that therefore multiple touch bodies are in X
Coordinate on axis is Xn, the coordinate in Y-axis is respectively as follows:
1st touch body: Yn1= V*{{tn1-[t0+(n-1)T]}-Xn}/2,
2nd touch body: Yn2={V*{tn2-[t0+(n-1)T]}-Xn}/2,
…………
M-th of touch body: Ynm={V*{tnm-[t0+(n-1)T]}-Xn}/2。
Embodiment 8
The present embodiment is substantially the same manner as Example 5, and the main distinction is: on a wherein edge for the X-axis or Y-axis respectively
One group of reception transducer array 5 and a combination formed by single transmitting transducer 6 with reflection strip array 3 are set, by sending out
Transmit-receive radio road driving transmitting transducer 6 continues acoustic waves signal；It is connect simultaneously by all reception energy converters 2 of reception circuit control
Surface acoustic wave signal is received, or by all reception energy converters 2 of reception circuit control successively independent receiving surface acoustic signals.
Further, preferred forms are to receive the direction of the launch that surface acoustic wave signal is arranged in transducer array 5.
When there is a touch body to touch, surface acoustic wave signal reaches after being touched the reflection of body 180 degree and receives energy converter Yi,
Due to each relative position coordinates for receiving energy converter 2 it is known that therefore the coordinate of the touch body in Y-axis is Yi, in X-axis
Coordinate are as follows: Xi= [V*(ti-t0)-Yi]/2；
When there is the touch of multiple touch bodies, surface acoustic wave signal reaches after being touched the reflection of body 180 degree and receives energy converter 2,
It is one of to receive energy converter YjMultiple surface acoustic wave signals are received, due to each relative position coordinates for receiving energy converter 2
It is known that therefore multiple coordinates for touching body in Y-axis are Yj, the coordinate in X-axis is respectively as follows:
1st touch body: Xj1=[V*(tj1-t0)-Yj]/2；
2nd touch body: Xj2= [V*(tj2-tj1)+Xj1]/2 or Xj2= [V*(tj2-t0)-Yj]/2；
…………
N-th of touch body: Xjn=[V*(tjn-tj1)+Xj1]/2 or Xjn=[V*(tjn-t0)-Yj]/2。
Embodiment 9
The present embodiment is identical as embodiment any one in embodiment 5-8, and the main distinction is: the transmitting transducer battle array
Column 4 receive transducer array 5, the single combination for receiving energy converter 2 and the formation of reflection strip array 3 or single transmitting transducer 6
The combination formed with reflection strip array 3, can be combined with each other while being arranged in X-axis and Y-axis.
Further,
In the present invention, involved 3 shape of single transmitting transducer 6 and reflection strip array in above-mentioned any one embodiment
At combination, single receive the combination that energy converter 2 and reflection strip array 3 formed, transmitting transducer arrays 4 or receive energy converter
Array 5 is preferably provided at the back side of touch screen body 1, and touch surface is made to become a complete pure-surface.
It is described to be driven since any one transmitting transducer 6 in the present invention, until all transmitting transducers 6 are all driven
Moved and once referred to any one transmitting transducer 6 of driving for reference, by from lower to upper or basipetal direction successively
Drive remaining transmitting transducer 6, wherein any one transmitting transducer 6 in acoustic waves signal, change by remaining transmitting
Energy device 6 does not work.
Claims (2)
1. a kind of multiple spot actual touch method of surface acoustic wave touch screen, which comprises the following steps:
(1), transmitting transducer (6) acoustic waves signal is driven by transmit circuit, energy converter is received by reception circuit control
(2) receiving surface acoustic signals；
(2), when having, when touching body touch, surface acoustic wave signal reaches after being touched body reflection and receives energy converter (2), when surface sound
When wave signal strength is greater than the threshold values of setting, circuit is received by the surface acoustic wave signal and is sent to central processing unit MCU, center
Processing unit MCU determines the coordinate for touching body；
One group of transmitting transducer arrays (4) is at least set in X-axis, be at least arranged in Y-axis one by individually receive energy converter (2) with
The combination that reflection strip array (3) is formed successively is operated alone since any one transmitting transducer (6) by transmit circuit
Transmitting transducer (6) acoustic waves signal then terminates primary until all transmitting transducers (6) were all driven once
Circulation；Energy converter (2) receiving surface acoustic signals are received by reception circuit control；
The sum of transmitting transducer (6) is n, first transmitting transducer X in the transmitting transducer arrays (4)1Persistently emit table
The start time point of face acoustic signals is t0, the time that each transmitting transducer (6) continues acoustic waves signal is T,
Terminated one cycle after all transmitting transducers (6) are all driven once, and received energy converter (2) from start time point t0
Start receiving surface acoustic signals, stops receiving surface acoustic signals after lasting n*T；
Within (n-1) * T~n*T period, n-th of transmitting transducer XnContinue acoustic waves signal, when there are multiple touch bodies
When touch, surface acoustic wave signal reaches after being touched 90 degree of body reflections and receives energy converter (2), receives circuit and receives the 1st table
The time point of face acoustic signals is tn1, the time point for receiving the 2nd surface acoustic wave signal is tn2, receive m-th of surface sound
The time point of wave signal is tnm, since the relative position coordinates of each transmitting transducer (6) are it is known that therefore multiple touch bodies are in X
Coordinate on axis is Xn, the coordinate in Y-axis is respectively as follows:
1st touch body: Yn1={V*{tn1-[t0+(n-1)T]}-Xn}/2,
2nd touch body: Yn2={V*{tn2-[t0+(n-1)T]}-Xn}/2,
…………
M-th of touch body: Ynm={V*{tnm-[t0+(n-1)T]}-Xn}/2, wherein V is the spread speed of surface acoustic wave signal.
2. a kind of multiple spot actual touch method of surface acoustic wave touch screen as described in claim 1, it is characterised in that: described
In acoustic waves signal, remaining transmitting transducer (6) does not work any one transmitting transducer (6).
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| CN201710121204.4A Active CN106909257B (en) | 2013-06-14 | 2013-06-14 | A kind of multiple spot actual touch method of surface acoustic wave touch screen |
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| KR102326770B1 (en) * | 2017-08-03 | 2021-11-17 | 삼성전자 주식회사 | Display apparatus and controle method thereof |
| CN107357470A (en) * | 2017-08-24 | 2017-11-17 | 成都睿联创想科技有限责任公司 | A kind of touch screen system based on surface acoustic wave technique |
| US10332543B1 (en) * | 2018-03-12 | 2019-06-25 | Cypress Semiconductor Corporation | Systems and methods for capturing noise for pattern recognition processing |
| TWI739651B (en) * | 2020-11-05 | 2021-09-11 | 華碩電腦股份有限公司 | Electronic device and touch control method thereof |
| CN115237270A (en) * | 2021-04-22 | 2022-10-25 | 华为技术有限公司 | Touch detection device, touch display screen and touch detection method |
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| CN106886343A (en) | 2017-06-23 |
| CN103472960A (en) | 2013-12-25 |
| CN106843604B (en) | 2019-12-24 |
| CN106843605A (en) | 2017-06-13 |
| CN103472960B (en) | 2017-06-06 |
| CN106843605B (en) | 2019-09-27 |
| CN106886343B (en) | 2019-12-24 |
| CN106909257A (en) | 2017-06-30 |
| CN106843604A (en) | 2017-06-13 |
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