CN107357470A - A kind of touch screen system based on surface acoustic wave technique - Google Patents
A kind of touch screen system based on surface acoustic wave technique Download PDFInfo
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- CN107357470A CN107357470A CN201710736463.8A CN201710736463A CN107357470A CN 107357470 A CN107357470 A CN 107357470A CN 201710736463 A CN201710736463 A CN 201710736463A CN 107357470 A CN107357470 A CN 107357470A
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- 238000010897 surface acoustic wave method Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000000758 substrate Substances 0.000 claims abstract description 101
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- 230000000644 propagated effect Effects 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims description 15
- 239000000919 ceramic Substances 0.000 claims description 12
- 238000005516 engineering process Methods 0.000 claims description 12
- 229910052451 lead zirconate titanate Inorganic materials 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 5
- 238000013459 approach Methods 0.000 claims description 4
- 238000010276 construction Methods 0.000 claims description 4
- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 claims description 3
- 230000002463 transducing effect Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
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- 230000008569 process Effects 0.000 description 4
- 230000001902 propagating effect Effects 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
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- 238000009434 installation Methods 0.000 description 2
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- 230000010358 mechanical oscillation Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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
- G06F3/043—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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- Acoustics & Sound (AREA)
- Human Computer Interaction (AREA)
- General Physics & Mathematics (AREA)
- Position Input By Displaying (AREA)
Abstract
The invention discloses a kind of touch screen system based on surface acoustic wave technique, including substrate and controller, the front of substrate is divided into borderline region and intermediate touch region, there is smooth round edge between the outward flange of borderline region and the bottom surface of substrate；The back side of substrate sets transducer array, transducer array includes transmitting transducer arrays and receive transducer array, transmitting transducer arrays outwards launch sound wave, transmitted along the smooth round edge of substrate, smooth round edge through substrate propagates to the front of substrate, and the receive transducer array received of substrate back is placed in after another corresponding smooth round edge of substrate is propagated；Borderline region is provided with transmitting striped array, to reflect the surface acoustic wave propagated along some edge of substrate surface；Controller is connected with transmitting transducer arrays and receive transducer array respectively by signal wire, to control the work of transmitting transducer arrays and receive transducer array and by plug-in handle reception signal after computer is transferred to by connection.
Description
Technical field
The present invention relates to touch screen technology field, specially a kind of touch screen system based on surface acoustic wave technique.
Background technology
Surface acoustic wave is a kind of mechanical wave propagated along dielectric surface.This kind of touch-screen is that (surface acoustic wave is propagated by substrate
Medium), sound generating transducer, reflector and sound wave receive transducer composition, wherein sound generating transducer can send one kind
High frequency sound wave crosses over substrate surface, and when finger touches screen, the sound wave on contact is prevented from, and thereby determines that coordinate position.
General surface acoustic wave touching screen is by screen body, transmitting transducer, receive transducer, reflector element array and signal line group
Into.To position touch coordinate, usual reflector element array and transducer are coupling in same touch plane.And touch device typically wraps
Transmitting transducer, receive transducer, reflector element array and signal wire are included, and existing surface acoustic wave touch screen is due to reflector element
Array and transducer are distributed in same touch plane, take certain position, bring difficulty to installation optimization, are especially designing
During boundless mount structure, transducer can not be hidden apparently higher than touch surface.
Prior art problem specifically includes：
(1) prior art corresponds to X and Y-axis coordinate, because the technology is used only respectively using two group four to transducer architecture
The corresponding axial coordinate of a pair of transducer architectures, therefore be only capable of accurately identifying single-point coordinate, identifying and more than 2 points coordinates at 2 points
When, it may appear that the pseudo- coordinate points of None- identified, that is, " the terrible point " being commonly called as." terrible point " coordinate make it that the technology can not be accurately and effectively
Identify and more than 2 points coordinates at 2 points.Although prior art is attempted to ask to solve " the terrible point " of two touches by the realization of algorithm
The defects of inscribing, but being limited to Design of Hardware Architecture, the trial solved using algorithm can only improve the probability that " terrible point " judges,
" terrible point " problem can not be really fully solved；
(2) use two group four of prior art has identical design, is by a transducer base to transducer architecture
Piece is fitted on a kind of pedestal of particular design, and the fitting is realized by UV adhesive curings.The transducer that this mode designs
Structure is very big, generally by UV adhesive curings on substrate, that is, protrudes in the structure of touch-screen.This design method to change
Energy device structure is generally damaged during transportation or use, so as to cause touch-screen to fail.And the mode of UV solidifications is usual
Completed using manual mode, productivity ratio and yield are all limited by production technology.
Problem 3：Prior art need to form reflection strip array, generally use silk-screen printing, high temperature sintering in substrate surface
Mode complete.There is the defects of printing precision is low, and reflection strip surface micro-structure is inconsistent in this kind of technology, cause sound wave can not
Propagated along the route of design, so as to the abnormal touch point of more difficult judgement and solution occur, influenceing the normal of touch-screen system makes
With.High energy consumption then be present using the technique of high temperature sintering, the problems such as yield is low and design size is limited；
(3) prior art realizes X-axis and Y-axis coordinate using two group four to transducer architecture, because only being adopted per axial coordinate
With two pairs of transducers structure, during sound wave is propagated along the reference axis, acoustic wave energy is progressively decayed, and substrate size is got over
Greatly, energy attenuation is bigger, therefore using the surface acoustic wave touch screen system of prior art, large scale in can not realizing.It is although existing
Having in technology has using four group eight to transducer architecture, large-sized touch-screen system in being realized by way of splicing, but should
Kind structure realizes the problem of blind area (region that can not be touched) is stitched in presence, and process consistency is poor, it is more difficult to mass production；
(4) prior art is " terrible point " problem existing for solution, is also attempted by the way of multi-transducer structure, i.e., along base
Edges of boards edge arranges multiple transducer architectures so as to form the acoustic wave propagation path intersected, i.e. sound wave grid in substrate surface.But adopt
With this structure, it is necessary to substantial amounts of transducer architecture, and existing transducer architecture is bulky, and mounting means is simple and crude, in work
It is difficult in skill.
The content of the invention
In order to overcome the shortcomings of prior art, the present invention provides a kind of architecture indoor construction adjustable corner ladder
Structure, both solved the problems, such as that common ladder needed to use by wall or other fixation means, and considerably increased ladder again
The usable degree of son, increase efficiency of construction, provide bigger convenience, convenience in transport and carrying for construction, and facilitate installation to make
With, can effectively solve the problem that background technology propose the problem of.
The technical solution adopted for the present invention to solve the technical problems is：A kind of touch screen system based on surface acoustic wave technique
System, including substrate and controller, to propagate surface acoustic wave, the front of the substrate is divided into borderline region and intermediate touch area
Domain, there is smooth round edge between the outward flange of the borderline region and the bottom surface of substrate；The back side of the substrate sets transducer
Array, the transducer array include transmitting transducer arrays and receive transducer array, and the transmitting transducer arrays are outside
To launch sound wave, transmitted along the smooth round edge of substrate, the smooth round edge through substrate propagates to the front of substrate, and through another phase of substrate
Corresponding smooth round edge is placed in the receive transducer array received of substrate back after propagating；The borderline region is provided with transmitting bar
Line array, to reflect the surface acoustic wave propagated along some edge of substrate surface, it is set to be propagated in whole substrate surface, so that
Whole substrate surface forms surface acoustic wave；
The controller is connected with transmitting transducer arrays and receive transducer array respectively by signal wire, to control
The work of transmitting transducer arrays and receive transducer array processed and by plug-in handle reception signal after pass through communication
Line is transferred to computer.
As a kind of preferable technical scheme of the present invention, the structure of the transducer array is using micro- made of MEMS approach
Mechanical structure, specially piezoelectric ceramics array, it is that there is ceramic MEMS piezoelectric-array made of ceramic composite
Transducer architecture.
As a kind of preferable technical scheme of the present invention, the ceramic composite is generally by lead zirconate titanate, i.e. PZT material
Or there is the material of similar characteristic to be made for other.
As a kind of preferable technical scheme of the present invention, the transmitting striped array is made using MEMS technology, and it is micro-
Tactic pattern, there are film characteristics, substrate surface is fitted in using bonding method.
As a kind of preferable technical scheme of the present invention, touch coordinate is set as (Xn, Yn), and wherein n represents touch point
Quantity；Transmitting transducer arrays and the receive transducer array is symmetrically arranged in substrate edges, specifically includes X-axis transmitting
Transducer array, Y-axis transmitting transducer arrays, X-axis receive transducer array and Y-axis receive transducer array.
As a kind of preferable technical scheme of the present invention, the acoustic wave energy edge that the X-axis transmitting transducer arrays are launched
Substrate surface is propagated, and is crossed after substrate surface and by X-axis receive transducer array received and be converted to electricity in substrate opposite side
Signal, Y-axis transmitting transducer arrays and Y-axis the receive transducer array is similarly.
As a kind of preferable technical scheme of the present invention, by transmitting transducer arrays and receive transducer array in base
The surface of plate, which is formed, represents X-axis, the sound wave grid of Y-axis coordinate；
When single-touch be present, X-axis transmitting transducer arrays and X-axis receive transducer array are by judging sound wave energy
Whether amount decays so as to identify X-axis coordinate, while by judging that the X-axis acoustic wave energy gets over time and the distance of substrate surface
Relation, identify Y-axis coordinate；
At the same time, Y-axis transmitting transducer arrays and Y-axis receive transducer array are by judging whether acoustic wave energy declines
Subtract so as to identify Y-axis coordinate, while by judging that the Y-axis acoustic wave energy gets over time and the distance relation of substrate surface, know
Do not go out X-axis coordinate, thus obtain single-touch coordinate (X1, Y1)；
When exist two touches when, by said structure relation can directly obtain two touch coordinates (X1, Y1), (X2,
Y2)。
Noun MEMS：That is MEMS (MEMS, Micro-Electro-Mechanical System), it is also referred to as micro-
Electronic mechanical system, micro-system, micromechanics etc., refer to size at several millimeters or even smaller high-tech device.MEMS its
Internal structure is typically an independent intelligence system in micron even nanometer scale.MEMS is in microelectric technique
Grow up on the basis of (semiconductor fabrication), merged photoetching, burn into film, LIGA, silicon micromachined, non-silicon it is micro- plus
The high-tech electronic mechanical devices of the fabrication techniques such as work and precision optical machinery processing.MEMS lays particular emphasis on ultraprecise machining, is related to
Microelectronics, material, mechanics, chemistry, mechanics subjects field.Its subject face cover power under minute yardstick, electricity, light, magnetic,
The physics such as sound, surface, chemistry, mechanistic each branch.The advantages of MEMS is：It is small volume, in light weight, low in energy consumption, resistance to
With good, cheap, stable performance of property etc., it can be multiple sensings of difference in functionality, different sensitive directions or direction of actuation
Device or actuator are integrated in one, or form microsensor array, microactrator array, or even the device of multiple functions is integrated
Together, the micro-system of complexity is formed.
Compared with prior art, the beneficial effects of the invention are as follows：The present invention utilizes the acoustic wave transducer based on MEMS design
Array and transmitting striped array, are designed by algorithm, realize true multiple point touching；MEMS structure uses IC design side
Method, can be mass-produced and precision is high, and yield is unified；Reflection strip array is made using MEMS technology in the present invention, array tool
There is the characteristics of wide equidistant, without considering the factor of wavelength change.The technique that it is used is similar with transducer array, and having to answer
With the characteristics of, it be micro-structural pattern to save design cost and cycle, made reflection strip array, generally has film spy
Property, substrate surface is fitted in using bonding method, curing process is simple, and energy consumption is low；The present invention uses transducer array structure
Touch system structure design, the path length that sound wave transmits along substrate surface can be reduced, so that large-sized touch in can realizing
Screen system, judge coordinate situation using the relation of acoustic wave energy and transition time, it is abnormal to eliminate " terrible point ".
Brief description of the drawings
Fig. 1 is the overall structure diagram of the present invention；
Fig. 2 is the dimensional structure diagram of the substrate of the present invention；
Coordinate schematic diagram when Fig. 3 is single-touch of the present invention；
X-axis X1 coordinates acoustic wave energy and transition time graph of a relation when Fig. 4 is single-touch of the present invention；
Coordinate schematic diagram when Fig. 5 is two touch of the invention；
X-axis X1 coordinates acoustic wave energy and transition time graph of a relation when Fig. 6 is two touch of the invention；
X-axis X2 coordinates acoustic wave energy and transition time graph of a relation when Fig. 7 is two touch of the invention；
Fig. 8 is coordinate schematic diagram when the same reference axis of the present invention has two touches；
Fig. 9 is the X-axis X1 coordinates acoustic wave energy and transition time relation when the same reference axis of the present invention has two touches
Figure；
Figure 10 is acoustic wave energy of the present invention with propagation path linear attenuation schematic diagram；
Figure 11 is the acoustic wave energy attenuation relation figure when present invention has single-touch；
Figure 12 is the acoustic wave energy attenuation relation figure when present invention has two point touch；
Figure 13 is acoustic wave energy of the present invention and transition time graph of a relation；
Acoustic wave energy and transition time graph of a relation when Figure 14 is single-touch of the present invention；
In figure：1- substrates；101- borderline regions；102- intermediate touch region；The smooth round edges of 103-；2- transducer arrays；
3- controllers；4- computers；5- launches striped array.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Embodiment：
As shown in figure 1, the invention provides a kind of touch screen system based on surface acoustic wave technique, including substrate 1 and control
Device 3, to propagate surface acoustic wave, the substrate 1 is usually glass material, but in other application, the substrate 1 can be any energy
The material of transfer surface sound wave；
As depicted in figs. 1 and 2, the front of the substrate 1 is divided into borderline region 101 and intermediate touch region 102, the side
There is smooth round edge 103 between the outward flange in battery limit (BL) domain 101 and the bottom surface of substrate 1；The back side of the substrate 1 sets transmitting transducing
Device array 2；The transmitting transducer arrays 2 outwards launch sound wave, are transmitted along the smooth round edge 103 of substrate 1, the light through substrate 1
Sliding round edge 103 propagates to the front of substrate 1, and is placed in substrate 1 after another corresponding smooth round edge 103 of substrate 1 is propagated
The receive transducer array 2 at the back side receives；The advantages of this design is need not to be placed in the front of substrate 1 for reflected sound
The reflection strip array of ripple, and transducer array 2 is placed in the back side of substrate 1, it is more attractive in appearance in structure, and transducer array 2 can be protected,
The borderline region 101 is also provided with launching striped array 5, to reflect the surface propagated along some edge of the surface of substrate 1
Sound wave, it is set to be propagated on the whole surface of substrate 1, so as to form surface acoustic wave on the whole surface of substrate 1；
Wherein transducer is a kind of piezoelectric transducer, and generally use piezoceramic material, piezoelectric transducer is to have
There is the sensor of the medium designs of piezo-electric effect.Piezo-electric effect refers to these media when stress is acted on and deformed, in two tables
The opposite electric charge of symbol is produced on face, non-charged state is returned to again after external force removal, mechanical energy is changed into electric energy,
Referred to as direct piezoelectric effect；When applying alternating voltage on two electrodes of medium, then substrate will produce mechanical oscillation, turn electric energy
It is changed into mechanical energy, referred to as inverse piezoelectric effect；The structure of transducer array 2 of the present invention uses micromechanics made of MEMS approach
Structure, specially piezoelectric ceramics array, it is the changing with ceramic MEMS piezoelectric-array made of ceramic composite
Can device structure；The ceramic composite generally by lead zirconate titanate, i.e. PZT material or other there is the material system of similar characteristic
Into.
The controller 3 is connected with transmitting transducer arrays 2 and receive transducer array 2 respectively by signal wire, is used
To control the work of transmitting transducer arrays 2 and receive transducer array 2, wherein controller 3 is to pass through fixed frequency signal
The vibration of driving transmitting transducer is received and changed by receive transducer to produce the surface acoustic wave in the transmission of the surface of substrate 1
Electric signal.
During system starts, initial work is completed first, i.e. controller 3 drives transmitting to change by fixed frequency signal
Energy device work, produces the surface acoustic wave transmitted along the surface of substrate 1, receive transducer receives the surface acoustic wave and is converted to electric signal
After be transferred to controller 3, controller 3 is handled by plug-in to be transferred to computer 4 by connection after reception signal and handles
The two dimensional model figure of a secondary time voltage is formed after the electric signal.
The transmitting striped array 5 is made using MEMS technology, and it is micro-structural pattern, has film characteristics, using viscous
Patch mode is fitted in the surface of substrate 1；For streak reflex array generally use of the prior art and the material identical material of substrate 1
Material is made, and has good reflectance factor to surface acoustic wave.Reflection strip is designed by certain rule, i.e. the width of reflection strip
The usually integral multiple of caused surface acoustic wave wavelength, and press wavelength integer multiple intervals.This design causes setting for reflection strip
Meter will be designed adjustment according to parameters such as used substrate 1, substrate, tranmitting frequencies.Meanwhile prior art generally use is high
Reflection strip is cured to the surface of substrate 1 by warm sintering process, the characteristics of high energy consumption, yield is low be present；The present invention uses MEMS skills
Reflection strip array has the characteristics of wide equidistant made of art, without considering the factor of wavelength change.Its technique used with
Transducer array 2 is similar, has reusable feature, saves design cost and cycle.Made reflection strip array is micro-
Tactic pattern, generally with film characteristics, the surface of substrate 1 is fitted in using bonding method, curing process is simple, and energy consumption is low.
As shown in Fig. 3 to Fig. 9, touch coordinate is set as (Xn, Yn), and wherein n represents the quantity of touch point；The transmitting is changed
Can device array 2 and receive transducer array 2 be symmetrically arranged in the edge of substrate 1, specifically include X-axis transmitting transducer arrays 2,
Y-axis transmitting transducer arrays 2, X-axis receive transducer array 2 and Y-axis receive transducer array 2；The X-axis transmitting transducer battle array
The acoustic wave energy that row 2 are launched is propagated along the surface of substrate 1, and is received after crossing the surface of substrate 1 in the opposite side of substrate 1 by X-axis
Transducer array 2 is received and converted to electric signal, and Y-axis transmitting transducer arrays 2 and Y-axis the receive transducer array 2 is similarly；
Formed by transmitting transducer arrays 2 and receive transducer array 2 on the surface of substrate 1 and represent X-axis, the sound wave of Y-axis coordinate
Grid；
When single-touch be present, X-axis transmitting transducer arrays 2 and X-axis receive transducer array 2 are by judging sound wave
Whether energy decays so as to identify X-axis coordinate, at the same by judge the X-axis acoustic wave energy get over the surface of substrate 1 time and
Distance relation, identify Y-axis coordinate；
Its principle is：When single-touch be present, sound corresponding to each coordinate of X-axis or Y-axis is judged by polling mode
Wave energy and transition time relation, find out the coordinate that acoustic wave energy changes, and by the coordinate acoustic wave energy and when getting over
Between relation judge the coordinate of another axle, so as to immediately arrive at the coordinate of touch point (X1, Y1).
At the same time, whether Y-axis transmitting transducer arrays 2 and Y-axis receive transducer array 2 are by judging acoustic wave energy
Decay so as to identify Y-axis coordinate, while by judging that the Y-axis acoustic wave energy gets over time and the distance relation on the surface of substrate 1,
X-axis coordinate is identified, thus obtains single-touch coordinate (X1, Y1)；
When exist two touches when, by said structure relation can directly obtain two touch coordinates (X1, Y1), (X2,
Y2)；
Its principle is：When exist two touches when, be may determine that by polling mode at X1, X2, Y1, Y2 coordinate have it is tactile
Touch, further, pass through the acoustic wave energy and transition time relation of corresponding X1, X2, Y1, Y2 coordinate, it can be determined that X1 reference axis
It is upper only to be touched at Y1 coordinates, only touched in X2 reference axis at Y2 coordinates.Simultaneously by Y1 axles, Y2 axles acoustic wave energy with crossing
More time relationship, the correctness of judgement can be strengthened.So as to which the method described in the art of this patent is eliminated prior art presence
Two point touch when " terrible point " interference problem.
Therefore the structure design that the present invention or invention use, the most obvious characteristic for being different from prior art is can Direct Recognition
Going out X-axis and Y-axis coordinate, when two or more touches be present, can effectively solve " terrible point " coordinate existing for prior art
Problem.
For above-described embodiment, the present invention is explained as follows, as shown in FIG. 10 to 14：
Acoustic wave energy and the explanation of transition time relation：
First, surface acoustic wave is a kind of ripple that can be propagated along the surface of substrate 1, and it is propagated on the surface of substrate 1, has linearity
The characteristics of strong, it is assumed that substrate 1 has uniform attenuation coefficient, then surface acoustic wave is propagated along the surface of substrate 1, and its energy is by linearly declining
Subtract, can not be detected until decaying to by piezoelectric sensing equipment.When finger touches, acoustic wave segment energy is by finger, energy
Decay, remaining acoustic wave energy continue to propagate and by linear attenuation along original path.
Get over relation with the time when the surface of substrate 1 is propagated to obtain acoustic wave energy, we are in transmitting transducer arrays 2
End plus a periodic pulse signal, i.e. surface acoustic wave are launched by recurrent pulse.During T=0, the end of receive transducer array 2, which does not receive, appoints
What signal, so when V0=0 (under actual conditions, receiving device has a hanging signal, considers here from ideal situation, temporarily
Do not indicate that).During T1, receive transducer array 2 receives signal, i.e. T1 be surface acoustic wave from transmitting transducer, through substrate 1
Surface reaches the very first time of receive transducer array 2 after propagating.T2 time points are that acoustic wave energy launches approach with the pulse period
The surface of substrate 1 receives the time point that transducer array 2 detects, i.e. a complete pulse period after completely propagating.Δ T=
(T2-T1) the i.e. surface acoustic wave represented by gets over the time used in the surface of substrate 1, therefore the point on T axles can be scaled sound wave energy
Measure the position when the surface of substrate 1 is getted over, i.e. coordinate.
When single-touch be present, the acoustic wave energy propagated along the surface of substrate 1 is by finger, receive transducer array 2
Detect that the deamplification, namely T3 have corresponded to the position of finger touch on substrate 1 at T3 time points.
The sound wave grid formed for the transducer array 2 in system described in this patent, each transducer group (transmitting transducing
Device and receive transducer) it is respectively provided with acoustic wave energy described above and transition time relation.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit requires rather than described above limits, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.Any reference in claim should not be considered as to the involved claim of limitation.
Claims (7)
1. a kind of touch screen system based on surface acoustic wave technique, including substrate (1) and controller (3), to propagate surface acoustic wave,
The front of the substrate (1) is divided into borderline region (101) and intermediate touch region (102), it is characterised in that：The borderline region
(101) there is smooth round edge (103) between outward flange and the bottom surface of substrate (1)；The back side of the substrate (1) sets transducer
Array (2), the transducer array (2) include transmitting transducer arrays and receive transducer array, the transmitting transducer battle array
Row outwards launch sound wave, are transmitted along the smooth round edge (103) of substrate (1), the smooth round edge (103) through substrate (1) propagates to base
The front of plate (1), and it is placed in after another corresponding smooth round edge (103) of substrate (1) is propagated the reception at substrate (1) back side
Transducer array receives；The borderline region (101) be provided with transmitting striped array (5), to reflect along substrate (1) surface some
The surface acoustic wave that edge is propagated, it is set to be propagated on whole substrate (1) surface, so as to form surface sound on whole substrate (1) surface
Ripple；
The controller (3) is connected with transmitting transducer arrays and receive transducer array respectively by signal wire, to control
The work of transmitting transducer arrays and receive transducer array processed and by plug-in handle reception signal after pass through communication
Line is transferred to computer (4).
A kind of 2. touch screen system based on surface acoustic wave technique according to claim 1, it is characterised in that：The transducer
The structure of array (103) uses micro mechanical structure made of MEMS approach, specially piezoelectric ceramics array, is by Ceramic Composite material
There is the transducer architecture of ceramic MEMS piezoelectric-array made of material.
A kind of 3. touch screen system based on surface acoustic wave technique according to claim 2, it is characterised in that：The ceramics are multiple
Condensation material generally by lead zirconate titanate, i.e. PZT material or other there is the material of similar characteristic to be made.
A kind of 4. touch screen system based on surface acoustic wave technique according to claim 1, it is characterised in that：The transmitting bar
Line array (5) is made using MEMS technology, and it is micro-structural pattern, has film characteristics, substrate is fitted in using bonding method
Surface.
A kind of 5. adjustable corner ladder structure of architecture indoor construction according to claim 1, it is characterised in that：Setting
Touch coordinate is (Xn, Yn), and wherein n represents the quantity of touch point；Transmitting transducer arrays and the receive transducer array
Substrate edges are symmetrically arranged in, X-axis transmitting transducer arrays, Y-axis transmitting transducer arrays, X-axis is specifically included and receives transducing
Device array and Y-axis receive transducer array.
A kind of 6. touch screen system structure based on surface acoustic wave technique according to claim 5, it is characterised in that：The X-axis
The acoustic wave energy that transmitting transducer arrays are launched is propagated along substrate surface, and is crossed after substrate surface in substrate opposite side quilt
X-axis receive transducer array received is simultaneously converted to electric signal, Y-axis transmitting transducer arrays and Y-axis the receive transducer array
Similarly.
A kind of 7. touch screen system based on surface acoustic wave technique according to claim 5, it is characterised in that：Changed by transmitting
Energy device array and receive transducer array are formed on the surface of substrate represents X-axis, the sound wave grid of Y-axis coordinate；
When single-touch be present, X-axis transmitting transducer arrays and X-axis receive transducer array are by judging that acoustic wave energy is
It is no to decay so as to identify X-axis coordinate, while by judging that the X-axis acoustic wave energy gets over the time of substrate surface and apart from pass
System, identifies Y-axis coordinate；
At the same time, Y-axis transmitting transducer arrays and Y-axis receive transducer array by judge acoustic wave energy whether decay from
And Y-axis coordinate is identified, while get over time and the distance relation of substrate surface by judging the Y-axis acoustic wave energy, identify X
Axial coordinate, thus obtain single-touch coordinate (X1, Y1)；
When two touches be present, two touch coordinates (X1, Y1), (X2, Y2) can be directly obtained by said structure relation.
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| WO2020151645A1 (en) * | 2019-01-24 | 2020-07-30 | 京东方科技集团股份有限公司 | Wearable display device and display control method therefor |
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Application publication date: 20171117 |