CN106886343B - Method for realizing real multi-point touch of acoustic touch screen - Google Patents
Method for realizing real multi-point touch of acoustic touch screen Download PDFInfo
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- CN106886343B CN106886343B CN201710120856.6A CN201710120856A CN106886343B CN 106886343 B CN106886343 B CN 106886343B CN 201710120856 A CN201710120856 A CN 201710120856A CN 106886343 B CN106886343 B CN 106886343B
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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
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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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04104—Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
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Abstract
The invention discloses a method for realizing real multi-point touch by an acoustic touch screen, which comprises the following steps: (1) at least one group of transmitting transducer arrays or receiving transducer arrays are arranged on the X axis or the Y axis; (2) the transmitting transducer is driven by the transmitting circuit to transmit the surface acoustic wave signals, and the receiving transducer is controlled by the receiving circuit to receive the surface acoustic wave signals; (3) when the touch body touches, the surface acoustic wave signal reaches the receiving transducer after being reflected by the touch body, when the intensity of the surface acoustic wave signal is larger than a set threshold value, the receiving circuit sends the surface acoustic wave signal to the central processing unit MCU, and the central processing unit MCU determines the coordinates of the touch body. The invention realizes the real touch response of two or more points, fundamentally eliminates ghost points, and can really realize the infinite touch response in the touch area by the prior art.
Description
The application is a divisional application of an invention application patent with the application number of 201310235013.2 and the application date of 2013.6.14, and is named as a method for realizing multi-point real touch on a surface acoustic wave touch screen.
Technical Field
The invention relates to a surface acoustic wave touch screen, in particular to a method for realizing real multi-point touch by using an acoustic wave touch screen.
Background
The existing touch screen mainly has the types of surface acoustic wave, infrared, capacitance and the like, wherein the surface acoustic wave touch screen has the advantages of high resolution, short response time, strong environmental adaptation, good stability, good light transmittance and the like, so that the surface acoustic wave touch screen becomes the touch screen with the most popularization value in several mainstream touch screens.
The existing common surface acoustic wave touch screen only has two mutually perpendicular physical positioning axes of an X axis and a Y axis, and can accurately identify a touch point to obtain a unique set of position coordinate data based on the principle of axis intersection, but when two or more touch points operate simultaneously, for example, coordinate combinations of three or four positions may occur when the two touch points operate simultaneously, wherein the coordinate combination of one or two positions is ghost point coordinates, so that the reported touch point is not a real touch point, the surface acoustic wave touch screen is disabled when multiple points touch simultaneously, and the development of the surface acoustic wave touch screen is greatly limited.
Therefore, the prior art proposes to solve the above problems from both software and hardware directions:
firstly, from the aspect of software, the touch firmware is upgraded in the surface acoustic wave touch field, and when a touch body enters a touch area, the touch point double-point detection, referred to as soft double-point for short, is realized on the software by adopting a time-sharing method or a partition method;
the time-sharing method requires that two touch bodies need to be at different time points when clicking a touch area for the first time, the interval between the two time points needs to be different by at least one touch screen response time, such as 10.4ms, after the first touch body clicks the touch area, the touch system detects a first real touch point and records the real coordinate position of the touch point, after the second touch body clicks the touch area at any time after 10.4ms, at least one or two coordinate axis data can newly appear, for example, when an X coordinate or a Y coordinate newly appears, the firmware system can automatically match the missing Y coordinate or X coordinate for the newly appearing X coordinate or Y coordinate, and the missing Y coordinate or X coordinate comes from the coordinate axis data of the first touch body when an X coordinate or a Y coordinate newly appears. If an X coordinate and a Y coordinate newly appear at the same time, the firmware system automatically pairs the newly appearing X coordinate and the newly appearing Y coordinate to identify a second real touch point. However, the time-sharing method is limited in that when a third touch object is processed to click a touch area and the third touch object is located at the intersection of the first two touch objects, no new X coordinate or Y coordinate data appears, and the third touch object cannot be recognized.
The partitioning method requires that the touch screen is physically partitioned into several regions, for example, the X axis is partitioned into many small regions, and the real points are distinguished from the ghost points by judging that the touch points enter into the corresponding regions, for example, in the prior art, when two touch objects simultaneously click the touch regions and the two touch points do not have the same X and Y coordinate axes, the firmware may simultaneously acquire two X coordinates and two Y coordinates, and when the two touch objects are paired, the two ghost points may appear, which may result in that the real positions of the two touch objects cannot be identified. However, the touch screen is physically divided into a plurality of different areas by the partition method, when a touch body moves in the touch area, two touch points can enter other areas in tandem, and the two real touch points can be distinguished from ghost points by the front-back time difference, and the principle is similar to a time-sharing method. The fatal defect of the partition method is that multiple touches cannot be identified in the same partition, and the defect that a third touch body cannot be identified still exists, for example, at the moment that two touch bodies in a first partition simultaneously enter a second partition, the third touch body clicks the second partition for the first time at the moment, because two touch points in the first partition cannot be identified, the third touch body is added at the moment of entering the second partition, three different Y coordinates and two different X coordinates are acquired in the second partition, and six combinations exist when the firmware system is matched, wherein the three combinations are ghost points.
According to the soft double-point middle partition method, due to the fact that the error rate of a plurality of touch bodies is high due to the fact that the principle is imperfect, in the time division method, besides the requirement on the time interval of first touch of the plurality of touch bodies, the requirement on surface acoustic wave signals is high, and the surface acoustic wave touch screen is difficult to achieve stable production. For example, when the surface acoustic wave touch screen is manufactured, especially a large-sized surface acoustic wave touch screen requires higher processing precision and higher stripe screen printing and baking temperature precision, so that the manufacturing difficulty is increased, and the difference between the surface acoustic wave touch screens is also larger, which leads to the increase of the difficulty in stably producing the surface acoustic wave touch screen.
Secondly, from the hardware, chinese patent No. 200920298621.7 discloses a multi-point surface acoustic wave touch screen, the disclosure date is 09/08/2010, and the technical scheme is that the multipoint surface acoustic wave touch screen comprises a controller, an X-axis positioning device, a Y-axis positioning device and an independent Z-axis positioning device, wherein the Z-axis positioning device comprises two Z-axis transmitting transducers, two Z-axis receiving transducers, two groups of Z-axis transmitting stripe arrays and two groups of Z-axis receiving stripe arrays which are arranged on a screen body, the two groups of Z-axis transmitting stripe arrays and the two groups of Z-axis receiving stripe arrays are distributed on four sides of the screen body to form positioning enclosure, and the edge of the screen body is parallel to the corresponding Z-axis transmitting stripe array or the Z-axis receiving stripe array, the Z-axis positioning device forms a Z axis, the X-axis positioning device forms an X axis, the Y-axis positioning device forms a Y axis, and the Z axis is intersected with the X axis and the Y axis.
The patent adds a Z axis which can assist in screening ghost points, can identify two physical touch bodies at most after the Z axis is added, continues to add a group of U axes which are vertical to the Z axis, and can identify three physical touch bodies at most, therefore, theoretically, N groups of coordinate axes can identify N-1 physical touch bodies at the same time, but the number of the groups of the coordinate axes also needs to add corresponding reflection stripe arrays around the touch screen body, surface acoustic wave signals generate a plurality of messy signals after passing through a plurality of groups of reflection stripe arrays, and a receiving transducer is easy to receive, thereby seriously influencing the identification coordinate points of a firmware system, and simultaneously, the plurality of groups of reflection stripe arrays need to be added around a wider touch screen body to meet the space arrangement requirement of the reflection stripe arrays, which is opposite to the light, narrow, edgeless and flat touch screens which are required by the current market, and the surface acoustic wave touch screen with N groups of coordinate axes cannot be produced by the existing processing technology.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provides a method for realizing real multi-point touch of an acoustic wave touch screen.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for realizing real multi-point touch by an acoustic wave touch screen is characterized by comprising the following steps:
(1) at least one group of transmitting transducer arrays formed by a plurality of transmitting transducers or at least one group of receiving transducer arrays formed by a plurality of receiving transducers are arranged on the X axis or the Y axis;
(2) the transmitting transducer is driven by the transmitting circuit to transmit the surface acoustic wave signals, and the receiving transducer is controlled by the receiving circuit to receive the surface acoustic wave signals;
(3) when the touch body touches, the surface acoustic wave signal reaches the receiving transducer after being reflected by the touch body, when the intensity of the surface acoustic wave signal is larger than a set threshold value, the receiving circuit sends the surface acoustic wave signal to the central processing unit MCU, and the central processing unit MCU determines the coordinates of the touch body.
At least one group of transmitting transducer arrays are arranged on the X axis, at least one group of receiving transducer arrays are arranged on the Y axis, and all transmitting transducers are driven by a transmitting circuit to simultaneously transmit surface acoustic wave signals; and controlling all the receiving transducers to simultaneously receive the surface acoustic wave signals by the receiving circuit, or controlling all the receiving transducers to sequentially and independently receive the surface acoustic wave signals by the receiving circuit.
When a touch body touches, the surface acoustic wave signal reaches the receiving transducer Y after being reflected by the touch body for 90 degreesiSince the relative position coordinates of each receiving transducer are known, the coordinate of the touch body on the Y axis is YiThe coordinates on the X-axis are: xi=V*(ti-t0)-Yi；
When a plurality of touch bodies touch, the surface acoustic wave signals reach the receiving transducers after being reflected by the touch bodies for 90 degrees, wherein one receiving transducer YjA plurality of surface acoustic wave signals are received, and the coordinates of a plurality of touch bodies on the Y axis are Y because the relative position coordinates of each receiving transducer are knownjThe coordinates on the X-axis are:
1 st touch body: xj1=V*(tj1-t0)-Yj；
2 nd touch body: xj2=V*(tj2-tj1)+Xj1Or Xj2=V*(tj2-t0)-Yj；
…………
Nth touch body: xjn=V*(tjn-tj1)+Xj1Or Xjn=V*(tjn-t0)-Yj(ii) a Where V is the propagation velocity of the surface acoustic wave signal, t0Starting point in time, t, for the transmitting transducer to start transmitting a surface acoustic wave signaliFor the first time receiving the transducerTime point of reception of surface acoustic wave signal, tj1Is YjTime point, t, at which the surface acoustic wave signal of the 1 st touch body is receivedj2Is YjTime point, t, at which the surface acoustic wave signal of the 2 nd touch object is receivedjnIs YjA point of time when the surface acoustic wave signal of the nth touch body is received.
At least one group of transmitting transducer arrays are arranged on the X axis, at least one group of receiving transducer arrays are arranged on the Y axis, the transmitting transducers are sequentially and independently driven by a transmitting circuit to transmit surface acoustic wave signals from any transmitting transducer, and a cycle is ended until all the transmitting transducers are driven once; and controlling all the receiving transducers to simultaneously receive the surface acoustic wave signals by the receiving circuit, or controlling all the receiving transducers to sequentially and independently receive the surface acoustic wave signals by the receiving circuit.
The total number of transmitting transducers in the transmitting transducer array is n, and the first transmitting transducer X1The starting time point of the continuous emission of the surface acoustic wave signal is t0Each transmitting transducer continuously transmits the surface acoustic wave signal for a time T until all transmitting transducers are driven once, and then a cycle is ended, and the receiving transducer starts from a starting time point T0Starting to receive the surface acoustic wave signal, and stopping receiving the surface acoustic wave signal after n × T;
the nth transmitting transducer X in the (n-1) T-nT periodnContinuously transmitting surface acoustic wave signals, and when a touch body touches, the surface acoustic wave signals reach the receiving transducer Y after being reflected by the touch body for 90 degreesnSince the relative position coordinates of each transmitting transducer and receiving transducer are known, the coordinates of the touch volume are determined to be (X)n，Yn）。
At least one group of transmitting transducer arrays are arranged on the X axis, at least one combination formed by a single receiving transducer and a reflection stripe array is arranged on the Y axis, the transmitting transducers are sequentially and independently driven by a transmitting circuit to transmit surface acoustic wave signals from any one transmitting transducer, and a cycle is ended until all the transmitting transducers are driven once; the receiving transducer is controlled by the receiving circuit to receive the surface acoustic wave signal.
The total number of transmitting transducers in the transmitting transducer array is n, and the first transmitting transducer X1The starting time point of the continuous emission of the surface acoustic wave signal is t0Each transmitting transducer continuously transmits the surface acoustic wave signal for a time T until all transmitting transducers are driven once, and then a cycle is ended, and the receiving transducer starts from a starting time point T0Starting to receive the surface acoustic wave signal, and stopping receiving the surface acoustic wave signal after n × T;
the nth transmitting transducer X in the (n-1) T-nT periodnContinuously transmitting surface acoustic wave signals, when a plurality of touch bodies touch, the surface acoustic wave signals reach the receiving transducer after being reflected by the touch bodies by 90 degrees, and the time point when the receiving circuit receives the 1 st surface acoustic wave signal is tn1The time point of receiving the 2 nd surface acoustic wave signal is tn2The m-th surface acoustic wave signal is received at the time point tnmSince the relative position coordinates of each transmitting transducer are known, the coordinates of the multiple touch volumes on the X axis are all XnThe coordinates on the Y axis are respectively:
1 st touch body: y isn1={V*{tn1-[t0+(n-1)T]}-Xn}/2，
2 nd touch body: y isn2={V*{tn2-[t0+(n-1)T]}-Xn}/2，
…………
M-th touch body: y isnm={V*{tnm-[t0+(n-1)T]}-Xn}/2。
The X axis is provided with at least one combination formed by a single transmitting transducer and a reflection stripe array, the Y axis is provided with at least one group of receiving transducer arrays, and a transmitting circuit drives the transmitting transducer to continuously transmit surface acoustic wave signals; and controlling all the receiving transducers to simultaneously receive the surface acoustic wave signals by the receiving circuit, or controlling all the receiving transducers to sequentially and independently receive the surface acoustic wave signals by the receiving circuit.
When a touch object touches, the surfaceThe sound wave signal reaches the receiving transducer Y after being reflected by the touch body for 90 degreesiSince the relative position coordinates of each receiving transducer are known, the coordinate of the touch body on the Y axis is YiThe coordinates on the X-axis are: xi= [V*(ti-t0)-Yi]/2；
When a plurality of touch bodies touch, the surface acoustic wave signals reach the receiving transducers after being reflected by the touch bodies for 90 degrees, wherein one receiving transducer YjA plurality of surface acoustic wave signals are received, and the coordinates of a plurality of touch bodies on the Y axis are Y because the relative position coordinates of each receiving transducer are knownjThe coordinates on the X-axis are:
1 st touch body: xj1=[V*(tj1-t0)-Yj]/2；
2 nd touch body: xj2=[V*(tj2-tj1)]/2+Xj1Or Xj2=[V*(tj2-t0)-Yj]/2；
…………
Nth touch body: xjn=[V*(tjn-tj1)]/2+Xj1Or Xjn=[V*(tjn-t0)-Yj]/2。
A group of transmitting transducer arrays and a group of receiving transducer arrays are respectively arranged on one edge of the X axis or the Y axis, and all transmitting transducers are driven by a transmitting circuit to simultaneously transmit surface acoustic wave signals; and controlling all the receiving transducers to simultaneously receive the surface acoustic wave signals by the receiving circuit, or controlling all the receiving transducers to sequentially and independently receive the surface acoustic wave signals by the receiving circuit.
When a touch body touches, the surface acoustic wave signal reaches the receiving transducer Y after being reflected by the touch body for 180 degreesiSince the relative position coordinates of each receiving transducer are known, the coordinate of the touch body on the Y axis is YiThe coordinates on the X-axis are: xi= V*(ti-t0)/2；
When a plurality of touch bodies touch, the surface acoustic wave signals reach the touch panel after being reflected by the touch bodies for 180 degreesReceiving transducers, one of which YjA plurality of surface acoustic wave signals are received, and the coordinates of a plurality of touch bodies on the Y axis are Y because the relative position coordinates of each receiving transducer are knownjThe coordinates on the X-axis are:
1 st touch body: xj1=V*(tj1-t0)/2；
2 nd touch body: xj2=V*(tj2-tj1)/2+Xj1Or Xj2=V*(tj2-t0)/2；
…………
Nth touch body: xjn= [V*(tjn-tj1)]/2+Xj1Or Xjn=V*(tjn-t0)/2。
A group of transmitting transducer arrays and a group of receiving transducer arrays are respectively arranged on one edge of the X axis or the Y axis, the transmitting transducers are sequentially and independently driven by a transmitting circuit to transmit surface acoustic wave signals from any transmitting transducer, and a cycle is ended until all the transmitting transducers are driven once; and controlling all the receiving transducers to simultaneously receive the surface acoustic wave signals by the receiving circuit, or controlling all the receiving transducers to sequentially and independently receive the surface acoustic wave signals by the receiving circuit.
The total number of transmitting transducers in the transmitting transducer array is n, and the first transmitting transducer X1The starting time point of the continuous emission of the surface acoustic wave signal is t0Each transmitting transducer continuously transmits the surface acoustic wave signal for a time T until all transmitting transducers are driven once, and then a cycle is ended, and the receiving transducer starts from a starting time point T0Starting to receive the surface acoustic wave signal, and stopping receiving the surface acoustic wave signal after n × T;
the nth transmitting transducer X in the (n-1) T-nT periodnContinuously transmitting surface acoustic wave signals, and when a touch body touches, the surface acoustic wave signals reach the receiving transducer Y after being reflected by the touch body for 180 degreesnSince the relative position coordinates of each transmitting transducer and receiving transducer are known, the position of each receiving transducer is knownDetermining the coordinates of the touch object as (X)n，Yn) (ii) a When a plurality of touch bodies touch, the coordinates of the touch bodies on the X axis are all XnThe coordinates on the Y axis are respectively:
1 st touch body: y isj1=V*(tj1-t0)/2；
2 nd touch body: y isj2=V*(tj2-tj1)/2+Yj1Or Y isj2=V*(tj2-t0)/2；
…………
Nth touch body: y isjn=[V*(tjn-tj1)]/2+Yj1Or Y isjn=V*(tjn-t0)/2。
A group of transmitting transducer arrays and a combination formed by a single receiving transducer and a reflection stripe array are respectively arranged on one edge of the X axis or the Y axis, the transmitting transducers are sequentially and independently driven by a transmitting circuit to transmit surface acoustic wave signals from any one transmitting transducer, and a cycle is ended until all the transmitting transducers are driven once; the receiving transducer is controlled by the receiving circuit to receive the surface acoustic wave signal.
The total number of transmitting transducers in the transmitting transducer array is n, and the first transmitting transducer X1The starting time point of the continuous emission of the surface acoustic wave signal is t0Each transmitting transducer continuously transmits the surface acoustic wave signal for a time T until all transmitting transducers are driven once, and then a cycle is ended, and the receiving transducer starts from a starting time point T0Starting to receive the surface acoustic wave signal, and stopping receiving the surface acoustic wave signal after n × T;
the nth transmitting transducer X in the (n-1) T-nT periodnContinuously transmitting surface acoustic wave signals, when a plurality of touch bodies touch, the surface acoustic wave signals reach the receiving transducer after being reflected by the touch bodies for 180 degrees, and the time point when the receiving circuit receives the 1 st surface acoustic wave signal is tn1The time point of receiving the 2 nd surface acoustic wave signal is tn2The m-th surface acoustic wave signal is received at the time point tnmSince the relative position coordinates of each transmitting transducer are known, the coordinates of the multiple touch volumes on the X axis are all XnThe coordinates on the Y axis are respectively:
1 st touch body: y isn1= V*{{tn1-[t0+(n-1)T]}-Xn}/2，
2 nd touch body: y isn2={V*{tn2-[t0+(n-1)T]}-Xn}/2，
…………
M-th touch body: y isnm={V*{tnm-[t0+(n-1)T]}-Xn}/2。
A group of receiving transducer arrays and a combination formed by a single transmitting transducer and a reflection stripe array are respectively arranged on one edge of the X axis or the Y axis, and the transmitting transducer is driven by a transmitting circuit to continuously transmit surface acoustic wave signals; and controlling all the receiving transducers to simultaneously receive the surface acoustic wave signals by the receiving circuit, or controlling all the receiving transducers to sequentially and independently receive the surface acoustic wave signals by the receiving circuit.
When a touch body touches, the surface acoustic wave signal reaches the receiving transducer Y after being reflected by the touch body for 180 degreesiSince the relative position coordinates of each receiving transducer are known, the coordinate of the touch body on the Y axis is YiThe coordinates on the X-axis are: xi= [V*(ti-t0)-Yi]/2；
When a plurality of touch bodies touch, the surface acoustic wave signals reach the receiving transducers after being reflected by the touch bodies for 180 degrees, wherein one receiving transducer YjA plurality of surface acoustic wave signals are received, and the coordinates of a plurality of touch bodies on the Y axis are Y because the relative position coordinates of each receiving transducer are knownjThe coordinates on the X-axis are:
1 st touch body: xj1=[V*(tj1-t0)-Yj]/2；
2 nd touch body: xj2=[V*(tj2-tj1)+Xj1]/2, or Xj2= [V*(tj2-t0)-Yj]/2；
…………
Nth touch body: xjn=[V*(tjn-tj1)+Xj1]/2, or Xjn=[V*(tjn-t0)-Yj]/2。
One edge of the X axis or the Y axis is respectively provided with a group of transmitting transducer arrays and a group of receiving transducer arrays, and one edge of the Y axis or the X axis is respectively provided with a group of transmitting transducer arrays and a group of receiving transducer arrays.
The receiving transducer array on the X axis or the Y axis or the combination formed by a single receiving transducer and a reflection stripe array is arranged at the transmitting end of the surface acoustic wave signal.
When any transmitting transducer transmits the surface acoustic wave signal, the rest transmitting transducers do not work.
The invention has the advantages that:
the structure not only can effectively distinguish real touch points of a plurality of touch bodies, but also can quickly determine the coordinates of the plurality of touch bodies on the X axis or the Y axis, fundamentally eliminates ghost points, realizes multi-point real touch response of two or more points, and really realizes infinite point touch response in a touch area; compared with the prior art represented by the Chinese patent No. 200920298621.7, the surface acoustic wave touch screen has the advantages that the design is simple, the signals received by the surface acoustic wave touch screen are strong, the touch performance is stable, and the circuit design matched with the surface acoustic wave touch screen does not need complex filtering and noise reduction circuit design, so that the material cost of the circuit is simplified, and the design difficulty of a printed circuit is reduced; meanwhile, the components used by the invention have low cost and mature production process, and are favorable for stably producing the surface acoustic wave touch screen in a large scale.
In the invention, the transmitting transducer array adopts a mode of simultaneously transmitting surface acoustic wave signals, which is beneficial to improving the strength of the surface acoustic wave signals, simplifying the design of a transmitting circuit switch and reducing the requirements of a plurality of valve chips; the transmitting transducer array adopts a mode of sequentially and independently transmitting surface acoustic wave signals, so that the mutual interference among a plurality of touch bodies can be effectively reduced, the stability of touch signals is improved, the energy consumption can be reduced, and the service life of the transmitting transducer can be prolonged; the receiving transducer array adopts a mode of simultaneously receiving the surface acoustic wave signals, so that the time for receiving the surface acoustic wave signals can be reduced, and the touch response speed can be improved; and the receiving transducer adopts a mode of receiving the surface acoustic wave signals in a time-sharing manner, so that the interference of the surface acoustic wave signals can be reduced, and the touch stability can be improved.
In the invention, the surface acoustic wave signals are transmitted by adopting the combination formed by the single transmitting transducer and the reflection stripe array, and are received by the receiving transducer array, or the surface acoustic wave signals are transmitted by adopting the transmitting transducer array, and the surface acoustic wave signals are received by adopting the combination formed by the single receiving transducer and the reflection stripe array, so that the multi-point touch can be effectively identified, the using number of the transducers is reduced, the production cost is reduced, particularly, the coordinates of a touch body close to the transmitting transducer can be quickly positioned, and the touch response speed is improved.
In the invention, a group of transmitting transducer arrays and a group of receiving transducer arrays are respectively arranged on each of two vertical edges of the touch screen body, so that the intensity of surface acoustic wave signals can be improved, and a uniform acoustic wave field is established on the surface of the whole touch screen body, thereby being beneficial to improving the touch stability; meanwhile, the stronger the surface acoustic wave signal is, the more favorable the stability of the touch function is, and the lighter the touch force (touch hand feeling for short) is; by adopting the design, ghost points can be eliminated fundamentally, so that the accuracy of judging the position of the touch point is improved; and the two groups of receiving transducer arrays enable the detection of the surface acoustic wave signals to be more sensitive and the detection result to be more accurate.
In the invention, the receiving transducer array on the X axis or the Y axis or the combination formed by the single receiving transducer and the reflection stripe array is arranged at the transmitting end of the surface acoustic wave signal, and the structure is favorable for reducing the propagation path of the reflected surface acoustic wave signal and reducing the attenuation of the surface acoustic wave signal.
Sixth, in the invention, when any one transmitting transducer transmits the surface acoustic wave signal, the rest transmitting transducers do not work, so that the energy consumption can be reduced, the energy is saved, the working time of the transmitting transducer can be shortened, and the service life of the surface acoustic wave touch screen can be prolonged.
Seventhly, when a touch body touches, the receiving circuit converts the received surface acoustic wave signals into data packets, the data packets are sequenced according to receiving time and sent to the central processing unit MCU according to a time period, the central processing unit MCU comprehensively processes transmitting time of each driving circuit, receiving time of the surface acoustic wave signals and the like, transmitting, receiving and processing can be carried out simultaneously, waiting time can be effectively shortened, and response speed of the surface acoustic wave touch screen is improved.
Drawings
Fig. 1 is a working principle diagram of embodiment 1 of the present invention.
Fig. 2 is a flowchart of the operation of embodiment 1 of the present invention.
Fig. 3 is a schematic structural diagram of embodiment 1 of the present invention.
Fig. 4 is a diagram showing the operation timing of the transmission axis in embodiment 1 of the present invention.
Fig. 5 is a diagram showing the operation time of the receiving shaft in embodiment 1 of the present invention.
Fig. 6 is a circuit block diagram of embodiment 1 of the present invention.
Fig. 7 is a working principle diagram of embodiment 2 of the present invention.
Fig. 8 is a flowchart of the operation of embodiment 2 of the present invention.
Fig. 9 is a schematic operation diagram of embodiment 2 of the present invention.
Fig. 10 is a diagram showing the operation timing of the transmission shaft in embodiment 2 of the present invention.
Fig. 11 is a diagram showing the operation timing of the receiving shaft in embodiment 2 of the present invention.
Fig. 12 is a working principle diagram of embodiment 3 of the present invention.
Fig. 13 is a flowchart of the operation of embodiment 3 of the present invention.
Fig. 14 is a schematic structural diagram of embodiment 3 of the present invention.
Fig. 15 is a diagram showing the operation timing of the transmission shaft in embodiment 3 of the present invention.
Fig. 16 is a diagram showing the operation timing of the receiving shaft in embodiment 3 of the present invention.
Fig. 17 is a schematic structural diagram of embodiment 4 of the present invention.
Fig. 18 is a diagram showing the operation timing of the transmission shaft in embodiment 4 of the present invention.
Fig. 19 is a diagram showing the operation timing of the receiving shaft in embodiment 4 of the present invention.
Fig. 20 is a schematic structural diagram of embodiment 5 of the present invention.
Fig. 21 is a schematic structural diagram of embodiment 6 of the present invention.
Fig. 22 is a schematic structural view of embodiment 7 of the present invention.
Fig. 23 is a schematic structural diagram of embodiment 8 of the present invention.
The labels in the figure are: 1. the touch screen comprises a touch screen body, 2, a receiving transducer, 3, a reflection stripe array, 4, a transmitting transducer array, 5, a receiving transducer array, 6 and a transmitting transducer.
Detailed Description
Example 1
A method for realizing real multi-point touch by an acoustic wave touch screen comprises the following steps:
(1) at least one group of transmitting transducer arrays 4 formed by a plurality of transmitting transducers 6 or at least one group of receiving transducer arrays 5 formed by a plurality of receiving transducers 2 are arranged on the X axis or the Y axis;
(2) the transmitting transducer 6 is driven by the transmitting circuit to transmit a surface acoustic wave signal, and the receiving transducer 2 is controlled by the receiving circuit to receive the surface acoustic wave signal;
(3) when a touch body touches, the surface acoustic wave signal reaches the receiving transducer 2 after passing through the touch body, when the intensity of the surface acoustic wave signal is larger than a set threshold value, the receiving circuit sends the surface acoustic wave signal to the central processing unit MCU, and the central processing unit MCU determines the coordinates of the touch body.
Further, when there is no touch of the touch object, the central processing unit MCU does not perform any process.
In the embodiment, when a touch body touches, the high-density and high-energy surface acoustic wave signals are transmitted, scattered, refracted and reflected through the touch body, wherein the reflected energy is divided into 180 degrees, reflected and returned to the transmitting transducer 6, reflected by 90 degrees and reflected to the vertical axis and reflected by other angles, tests have shown that, because the vertical distance from the touch object to the emission axis or an axis perpendicular to the emission axis is the shortest, the intensity of the 90 degree reflected energy is at its maximum on the axis perpendicular to the emission axis, meanwhile, the energy intensity of the 180-degree reflected energy on the transmitting shaft is maximum, so when the intensity of the surface acoustic wave signal received by the receiving circuit is greater than a set threshold value, the receiving circuit sends the surface acoustic wave signal to the central processing unit MCU, and the central processing unit MCU determines the coordinates of the touch body.
In this embodiment, the transmitting transducer array 4 is formed by a plurality of transmitting transducers 6 arranged in a linear sequence on an X axis or a Y axis, and the transmitting transducers 6 in the transmitting transducer array 4 are arranged in parallel; the receiving transducer array 5 is formed by arranging a plurality of receiving transducers 2 in a linear sequence on a Y axis or an X axis, and the receiving transducers 2 in the receiving transducer array 5 are arranged in parallel.
In this embodiment, the receiving transducer array 5 is used to replace the combined structure formed by the single receiving transducer 2 and the reflection fringe array 3 in the prior art, and the transmitting transducer array 4 is used to replace the combined structure formed by the single transmitting transducer 6 and the reflection fringe array 3 in the prior art, so that ghost points can be eliminated fundamentally, and multi-point real touch response of two or more points can be realized.
In this embodiment, it is preferable that a group of transmitting transducer arrays 4 is disposed on the X axis, a group of receiving transducer arrays 5 is disposed on the Y axis, and all transmitting transducers 6 are driven by a transmitting circuit to transmit surface acoustic wave signals simultaneously; controlling all the receiving transducers 2 to simultaneously receive the surface acoustic wave signals by a receiving circuit, or controlling all the receiving transducers 2 to sequentially and independently receive the surface acoustic wave signals by the receiving circuit; but not limited to the above preferred arrangement, for example, two sets of transmit transducer arrays 4 may be arranged in the X-axis and two sets of receive transducer arrays 5 may be arranged in the Y-axis.
When a touch body touches, the surface acoustic wave signal reaches the receiving transducer Y after being reflected by the touch body for 90 degreesiSince the relative position coordinates of each receiving transducer 2 are known, the coordinates of the touch body on the Y axis are YiThe coordinates on the X-axis are: xi=V*(ti-t0)-Yi；
When a plurality of touch bodies touch, the surface acoustic wave signals reach the receiving transducer 2 after being reflected by the touch bodies for 90 degrees, wherein one receiving transducer YjA plurality of surface acoustic wave signals are received, and since the relative position coordinates of each receiving transducer 2 are known, the coordinates of a plurality of touch bodies on the Y axis are YjThe coordinates on the X-axis are:
1 st touch body: xj1=V*(tj1-t0)-Yj；
2 nd touch body: xj2=V*(tj2-t j1)+Xj1Or Xj2=V*(tj2-t0)-Yj；
…………
Nth touch body: xjn=V*(tjn-tj1)+Xj1Or Xjn=V*(tjn-t0)-Yj(ii) a Where V is the propagation velocity of the surface acoustic wave signal, t0For the starting point in time, t, at which the transmitting transducer 6 starts to transmit a surface acoustic wave signaliFor the first time point, t, at which the surface acoustic wave signal is received by the receiving transducer 2j1Is YjTime point, t, at which the surface acoustic wave signal of the 1 st touch body is receivedj2Is YjTime point, t, at which the surface acoustic wave signal of the 2 nd touch object is receivedjnIs YjA point of time when the surface acoustic wave signal of the nth touch body is received.
In this embodiment, as shown in fig. 1, T 'is the time when the central processing unit MCU processes the surface acoustic wave signal received by the receiving circuit, that is, when the time T when the transmitting transducer 6 continues to transmit the surface acoustic wave signal is zero, the transmission of the surface acoustic wave signal is stopped, and the central processing unit MCU processes the surface acoustic wave signal received by the receiving circuit within the time T'.
Example 2
This example is substantially the same as example 1, with the main differences: a group of transmitting transducer arrays 4 are arranged on the X axis, a group of receiving transducer arrays 5 are arranged on the Y axis, the transmitting transducers 6 are sequentially and independently driven by a transmitting circuit to transmit surface acoustic wave signals from any transmitting transducer 6, and a cycle is ended until all the transmitting transducers 6 are driven once; controlling all the receiving transducers 2 to simultaneously receive the surface acoustic wave signals by a receiving circuit, or controlling all the receiving transducers 2 to sequentially and independently receive the surface acoustic wave signals by the receiving circuit; the above-described arrangement is preferable, but not limited to the above-described preferable arrangement, and for example, one set of the transmission transducer arrays 4 may be provided in the X axis, and two sets of the reception transducer arrays 5 may be provided in the Y axis.
Further, the total number of transmitting transducers 6 in the transmitting transducer array 4 is n, and the first transmitting transducer X1The starting time point of the continuous emission of the surface acoustic wave signal is t0Each transmitting transducer 6 continues to transmit the surface acoustic wave signal for a time T until the cycle ends after all transmitting transducers 6 have been driven once, and the receiving transducer 2 starts from a starting time T0Starting to receive the surface acoustic wave signal, and stopping receiving the surface acoustic wave signal after n × T;
the nth transmitting transducer X in the (n-1) T-nT periodnContinuously transmitting surface acoustic wave signals, and when a touch body touches, the surface acoustic wave signals reach the receiving transducer Y after being reflected by the touch body for 90 degreesnSince the relative position coordinates of each transmitting transducer 6 and receiving transducer 2 are known, the coordinates of the touch body are determined to be (X)n，Yn）。
The working principle of the embodiment is as follows: firstly, the transmitting transducers 6 in the transmitting transducer array 4 are set according to X in sequence1、X2、X3……XmArranged, the receiving transducers 2 in the receiving transducer array 5 being in turn arranged in Y1、Y2、Y3……YnArranged and then the transmitting transducers X are driven individually by a transmitting circuit1Continuously transmitting surface acoustic wave signals within a set time T, starting countdown, and transmitting the transducer X1The coordinates of which are pre-recorded by the central processing unit MCU, and when a touch body touches, the receiving transducer Y is detected1Whether the energy intensity of the received surface acoustic wave signal is larger than a set threshold value or not, if so, the receiving transducer Y1If the energy intensity of the received surface acoustic wave signal is greater than a set threshold value, the touch body is judged to be true value 1, and the central processing unit MCU records the receiving transducer Y1If receiving the transducer Y1If the energy intensity of the received surface acoustic wave signal is smaller than a set threshold value, a false value of 0 is judged, a non-touch body is represented, and the central processing unit MCU does not record any record; complete receiving transducer Y1After the detection, the detection of the remaining receiving transducers 2 is completed in sequence, until the detection of all the receiving transducers 2 is completed, the receiving circuit converts the surface acoustic wave signals received by the acoustic wave signal receiving assembly into data packets through the A/D circuit, time marks are added to the data packets, then the data packets are sent to the central processing unit MCU for processing according to time periods, and the central processing unit MCU determines the coordinates of the touch body to be (X)1，Y1) The above-mentioned steps are repeated until all the transmitting transducers 6 on the X axis are driven, and after one cycle is completed, the receiving circuit stops receiving the surface acoustic wave signal and waits for the instruction of the next cycle.
As shown in FIG. 9, the central processing unit MCU drives the transmitting transducer X through the transmitting circuit1When the touch body A is met, the high-density and high-energy surface acoustic wave signals are reflected by 90 degrees through the touch body A, and the receiving transducer Y is removed8In addition, the other receiving transducers 2 receive the reflected energy of the surface acoustic wave signal to different degrees, but only the receiving transducer Y8The energy intensity of the received surface acoustic wave signal is greater than a set threshold value, so thatAfter the Y-axis scanning is finished, only one peak value Y on the Y-axis can be determined8Then it can be determined that a true touch point exists, i.e. (X)1、Y8）。
After the surface acoustic wave signal detection of all the receiving transducers 2 is completed, the transmitting circuit stops driving the transmitting transducer X1And driving the transmitting transducers X individually2The surface acoustic wave signal propagates along the Y-axis direction, and when encountering touch objects B and C, the surface acoustic wave signal is reflected by the touch objects by 90 degrees, and the maximum energy values after reflection are respectively reflected by Y5And Y3When receiving, no reflection occurs at the place without touch point, no energy is received naturally, and after the Y-axis finishes scanning, two peak values Y exist5And Y3Then it can be determined that there are two true touch points present, i.e. (X)2、Y5) And (X)2、Y3）。
The transmitting circuit stops driving the transmitting transducer X2After that, the transmitting transducer X is driven separately3The surface acoustic wave signal propagates along the Y-axis direction but does not encounter the touch object, and no signal is received by the Y-axis receiving transducer array 5, and thus no peak, X3There is no real touch point.
The transmitting circuit stops driving the transmitting transducer X3After that, the transmitting transducer X is driven separately4The surface acoustic wave signal propagates along the Y-axis direction, and when encountering the touch objects D, E and F, the maximum of the energy reflected by 90 degrees is Y-axis5、Y7And Y9And receiving, no reflection occurs at the position without a touch point, although a touch body B exists in the 90-degree direction of the touch body D, according to the surface acoustic wave transmission principle, 90% of energy of a surface acoustic wave signal is transmitted, so that the transmission of the 90-degree reflection energy of the D is not influenced by the existence of the B, and the amplitude of the 90-degree reflection energy is several times larger than that of the reflection energy of other angles, so that the amplitude difference of the reflection energy of other angles is not influenced. So after the end of the scan on the Y axis, there are three peaks Y5、Y7And Y9Then it can be determined that there are three true touch points, i.e. (X)4、Y5）、（X4、Y7) And (X)4、Y9）。
The transmitting circuit stops driving the transmitting transducer X4After that, the transmitting transducer X is driven separately5The surface acoustic wave signal propagates along the Y-axis direction but does not encounter the touch object, and no signal is received by the Y-axis receiving transducer array 5, and thus no peak, X5There is no real touch point.
The transmitting circuit stops driving the transmitting transducer X5After a voltage of (2), the transmitting transducers X are driven individually6The surface acoustic wave signal propagates along the Y-axis direction, and when a touch body G is encountered, the maximum of energy reflected by 90 degrees is reflected by Y3It is received that although one touch C exists in the 90-degree direction of the touch body G, the determination of the peak value is not affected, and after the scanning of the Y axis is finished, there is a peak value Y3Thus, it can be determined that a true touch point exists, i.e., (X)6、Y3）。
Example 3
This example is substantially the same as example 2, with the main differences: a group of transmitting transducer arrays 4 are arranged on the X axis, a combination formed by a single receiving transducer 2 and a reflection stripe array 3 is arranged on the Y axis, the transmitting transducers 6 are sequentially and independently driven by a transmitting circuit to transmit surface acoustic wave signals from any transmitting transducer 6, and a cycle is ended until all the transmitting transducers 6 are driven once; the receiving transducer 2 is controlled by the receiving circuit to receive the surface acoustic wave signal; the above-mentioned arrangement is preferable, but not limited to the above-mentioned preferred arrangement, for example, two sets of transmitting transducer arrays 4 may be disposed on two sides of the X axis, and two combinations of a single receiving transducer 2 and a reflection fringe array 3 may be disposed on two sides of the Y axis.
Further, the total number of transmitting transducers 6 in the transmitting transducer array 4 is n, and the first transmitting transducer X1The starting time point of the continuous emission of the surface acoustic wave signal is t0Each transmitting transducer 6 continues to transmit the surface acoustic wave signal for a time T, until the cycle ends after all transmitting transducers 6 have been driven once,the receiving transducer 2 starts from a starting point in time t0Starting to receive the surface acoustic wave signal, and stopping receiving the surface acoustic wave signal after n × T;
the nth transmitting transducer X in the (n-1) T-nT periodnContinuously transmitting surface acoustic wave signals, when a plurality of touch bodies touch, the surface acoustic wave signals reach the receiving transducer 2 after being reflected by the touch bodies by 90 degrees, and the time point when the receiving circuit receives the 1 st surface acoustic wave signal is tn1The time point of receiving the 2 nd surface acoustic wave signal is tn2The m-th surface acoustic wave signal is received at the time point tnmSince the relative position coordinates of each transmitting transducer 6 are known, the coordinates of the multiple touch volumes on the X axis are all XnThe coordinates on the Y axis are respectively:
1 st touch body: y isn1={V*{tn1-[t0+(n-1)T]}-Xn}/2，
2 nd touch body: y isn2={V*{tn2-[t0+(n-1)T]}-Xn}/2，
…………
M-th touch body: y isnm={V*{tnm-[t0+(n-1)T]}-Xn}/2。
The working principle of the present embodiment is basically the same as that of embodiment 2, and the main difference is that: for any transmitting transducer XiWhile driving, the transmitting transducer XiThe transmitted surface acoustic wave signal is parallel to the Y-axis direction, and the transducer X is transmittediThe touch body makes the surface acoustic wave signal generate 90-degree reflection and then transmits the reflection to the reflection stripe array 3, the surface acoustic wave signal is transmitted to the receiving transducer 2 after 90-degree deflection after passing through the reflection stripe array 3, and then the receiving transducer 2 performs sound-electricity conversion in a unified mode. It is clear that all surface acoustic wave signals have undergone a segment of X after being reflected at 90 degreesiThe distance from the vertical direction to the reflection fringe array 3 is different only in that after the reflection fringe array 3 is turned twice, the surface acoustic wave signal close to the receiving transducer 2 reaches the receiving transducer 2 firstly, and the surface acoustic wave signal far from the receiving transducer 2 reaches the receiving transducer 2 later, and the embodiment cancels the receivingThe transducer array 5 reduces the production cost of the surface acoustic wave touch screen, and is beneficial to mass production.
Example 4
This example is substantially the same as example 1, with the main differences: a combination formed by a single receiving transducer 2 and a reflection stripe array 3 is arranged on the X axis, a group of receiving transducer arrays 5 are arranged on the Y axis, and a transmitting transducer 6 is driven by a transmitting circuit to continuously transmit surface acoustic wave signals; controlling all the receiving transducers 2 to simultaneously receive the surface acoustic wave signals by a receiving circuit, or controlling all the receiving transducers 2 to sequentially and independently receive the surface acoustic wave signals by the receiving circuit; the above arrangement is preferable, but not limited to the above preferred arrangement, and for example, two combinations of a single receiving transducer 2 and the reflection fringe array 3 may be provided on each of two sides of the X axis, and two sets of receiving transducer arrays 5 may be provided on each of two sides of the Y axis.
Further, when a touch object touches, the surface acoustic wave signal is reflected by the touch object for 90 degrees and reaches the receiving transducer YiSince the relative position coordinates of each receiving transducer 2 are known, the coordinates of the touch body on the Y axis are YiThe coordinates on the X-axis are: xi= [V*(ti-t0)-Yi]/2；
When a plurality of touch bodies touch, the surface acoustic wave signals reach the receiving transducer 2 after being reflected by the touch bodies for 90 degrees, wherein one receiving transducer YjA plurality of surface acoustic wave signals are received, and since the relative position coordinates of each receiving transducer 2 are known, the coordinates of a plurality of touch bodies on the Y axis are YjThe coordinates on the X-axis are:
1 st touch body: xj1=[V*(tj1-t0)-Yj]/2；
2 nd touch body: xj2=[V*(tj2-tj1)]/2+Xj1Or Xj2=[V*(tj2-t0)-Yj]/2；
…………
Nth touch body: xjn=[V*(tjn-tj1)]/2+Xj1Or Xjn=[V*(tjn-t0)-Yj]/2。
Example 5
This example is substantially the same as example 1, with the main differences: a group of transmitting transducer arrays 4 and a group of receiving transducer arrays 5 are respectively arranged on one edge of the X axis or the Y axis, and all transmitting transducers 6 are driven by a transmitting circuit to simultaneously transmit surface acoustic wave signals; all the receiving transducers 2 are controlled by the receiving circuit to simultaneously receive the surface acoustic wave signals, or all the receiving transducers 2 are controlled by the receiving circuit to sequentially and independently receive the surface acoustic wave signals.
Further, in the preferred embodiment, the receiving transducer array 5 is parallel to the transmitting transducer array 4, and the receiving transducer array 5 is disposed at the transmitting end of the surface acoustic wave signal.
When a touch body touches, the surface acoustic wave signal reaches the receiving transducer Y after being reflected by the touch body for 180 degreesiSince the relative position coordinates of each receiving transducer 2 are known, the coordinates of the touch body on the Y axis are YiThe coordinates on the X-axis are: xi= V*(ti-t0)/2；
When a plurality of touch bodies touch, the surface acoustic wave signals reach the receiving transducer 2 after being reflected by the touch bodies for 180 degrees, wherein one receiving transducer YjA plurality of surface acoustic wave signals are received, and since the relative position coordinates of each receiving transducer 2 are known, the coordinates of a plurality of touch bodies on the Y axis are YjThe coordinates on the X-axis are:
1 st touch body: xj1=V*(tj1-t0)/2；
2 nd touch body: xj2=V*(tj2-tj1)/2+Xj1Or Xj2=V*(tj2-t0)/2；
…………
Nth touch body: xjn= [V*(tjn-tj1)]/2+Xj1Or Xjn=V*(tjn-t0)/2。
Example 6
This example is substantially the same as example 5, with the main differences: a group of transmitting transducer arrays 4 and a group of receiving transducer arrays 5 are respectively arranged on one edge of the X axis or the Y axis, the transmitting transducers 6 are sequentially and independently driven by a transmitting circuit to transmit surface acoustic wave signals from any transmitting transducer 6, and a cycle is ended until all the transmitting transducers 6 are driven once; all the receiving transducers 2 are controlled by the receiving circuit to simultaneously receive the surface acoustic wave signals, or all the receiving transducers 2 are controlled by the receiving circuit to sequentially and independently receive the surface acoustic wave signals.
The total number of transmitting transducers 6 in the transmitting transducer array 4 is n, the first transmitting transducer X1The starting time point of the continuous emission of the surface acoustic wave signal is t0Each transmitting transducer 6 continues to transmit the surface acoustic wave signal for a time T until the cycle ends after all transmitting transducers 6 have been driven once, and the receiving transducer 2 starts from a starting time T0Starting to receive the surface acoustic wave signal, and stopping receiving the surface acoustic wave signal after n × T;
the nth transmitting transducer X in the (n-1) T-nT periodnContinuously transmitting surface acoustic wave signals, and when a touch body touches, the surface acoustic wave signals reach the receiving transducer Y after being reflected by the touch body for 180 degreesnSince the relative position coordinates of each transmitting transducer 6 and receiving transducer 2 are known, the coordinates of the touch volume are determined to be (X)n，Yn) (ii) a When a plurality of touch bodies touch, the coordinates of the touch bodies on the X axis are all XnThe coordinates on the Y axis are respectively:
1 st touch body: y isj1=V*(tj1-t0)/2；
2 nd touch body: y isj2=V*(tj2-tj1)/2+Yj1Or Y isj2=V*(tj2-t0)/2；
…………
Nth touch body: y isjn=[V*(tjn-tj1)]/2+Yj1Or Y isjn=V*(tjn-t0)/2。
Example 7
This example is substantially the same as example 6, with the main differences: a group of transmitting transducer arrays 4 and a combination formed by a single receiving transducer 2 and a reflection stripe array 3 are respectively arranged on one edge of the X axis or the Y axis, the transmitting transducers 6 are sequentially and independently driven by a transmitting circuit to transmit surface acoustic wave signals from any one transmitting transducer 6, and a cycle is ended until all the transmitting transducers 6 are driven once; the receiving transducer 2 is controlled by the receiving circuit to receive the surface acoustic wave signal.
Further, the preferred embodiment is that the combination of a single receiving transducer 2 and a reflective fringe array 3 is placed at the transmitting end of the surface acoustic wave signal.
The total number of transmitting transducers 6 in the transmitting transducer array 4 is n, the first transmitting transducer X1The starting time point of the continuous emission of the surface acoustic wave signal is t0Each transmitting transducer 6 continues to transmit the surface acoustic wave signal for a time T until the cycle ends after all transmitting transducers 6 have been driven once, and the receiving transducer 2 starts from a starting time T0Starting to receive the surface acoustic wave signal, and stopping receiving the surface acoustic wave signal after n × T;
the nth transmitting transducer X in the (n-1) T-nT periodnContinuously transmitting surface acoustic wave signals, when a plurality of touch bodies touch, the surface acoustic wave signals reach the receiving transducer 2 after being reflected by the touch bodies by 180 degrees, and the time point when the receiving circuit receives the 1 st surface acoustic wave signal is tn1The time point of receiving the 2 nd surface acoustic wave signal is tn2The m-th surface acoustic wave signal is received at the time point tnmSince the relative position coordinates of each transmitting transducer 6 are known, the coordinates of the multiple touch volumes on the X axis are all XnThe coordinates on the Y axis are respectively:
1 st touch body: y isn1= V*{{tn1-[t0+(n-1)T]}-Xn}/2，
2 nd touch body: y isn2={V*{tn2-[t0+(n-1)T]}-Xn}/2，
…………
M-th touch body: y isnm={V*{tnm-[t0+(n-1)T]}-Xn}/2。
Example 8
This example is substantially the same as example 5, with the main differences: a group of receiving transducer arrays 5 and a combination formed by a single transmitting transducer 6 and the reflection fringe array 3 are respectively arranged on one edge of the X axis or the Y axis, and the transmitting transducer 6 is driven by a transmitting circuit to continuously transmit surface acoustic wave signals; all the receiving transducers 2 are controlled by the receiving circuit to simultaneously receive the surface acoustic wave signals, or all the receiving transducers 2 are controlled by the receiving circuit to sequentially and independently receive the surface acoustic wave signals.
Further, in the preferred embodiment, the receiving transducer array 5 is disposed in the transmission direction of the surface acoustic wave signal.
When a touch body touches, the surface acoustic wave signal reaches the receiving transducer Y after being reflected by the touch body for 180 degreesiSince the relative position coordinates of each receiving transducer 2 are known, the coordinates of the touch body on the Y axis are YiThe coordinates on the X-axis are: xi= [V*(ti-t0)-Yi]/2；
When a plurality of touch bodies touch, the surface acoustic wave signals reach the receiving transducer 2 after being reflected by the touch bodies for 180 degrees, wherein one receiving transducer YjA plurality of surface acoustic wave signals are received, and since the relative position coordinates of each receiving transducer 2 are known, the coordinates of a plurality of touch bodies on the Y axis are YjThe coordinates on the X-axis are:
1 st touch body: xj1=[V*(tj1-t0)-Yj]/2；
2 nd touch body: xj2= [V*(tj2-tj1)+Xj1]/2, or Xj2= [V*(tj2-t0)-Yj]/2；
…………
The n isA touch object: xjn=[V*(tjn-tj1)+Xj1]/2, or Xjn=[V*(tjn-t0)-Yj]/2。
Example 9
This example is the same as any one of examples 5 to 8, with the main difference that: the transmitting transducer array 4, the receiving transducer array 5, the combination of the single receiving transducer 2 and the reflection fringe array 3, or the combination of the single transmitting transducer 6 and the reflection fringe array 3 may be combined with each other while being disposed on the X-axis and the Y-axis.
Further, in the above-mentioned case,
in the present invention, the combination of the single transmitting transducer 6 and the reflection stripe array 3, the combination of the single receiving transducer 2 and the reflection stripe array 3, and the transmitting transducer array 4 or the receiving transducer array 5 mentioned in any of the above embodiments are preferably disposed on the back surface of the touch screen body 1, so that the touch surface becomes a complete pure plane.
In the present invention, the driving from any one transmitting transducer 6 until all transmitting transducers 6 are driven once means that the remaining transmitting transducers 6 are sequentially driven from bottom to top or from top to bottom with reference to any one transmitting transducer 6 being driven, wherein when any one transmitting transducer 6 transmits a surface acoustic wave signal, the remaining transmitting transducers 6 do not operate.
Claims (2)
1. A method for realizing real multi-point touch by an acoustic wave touch screen is characterized by comprising the following steps:
(1) at least one group of transmitting transducer arrays (4) formed by a plurality of transmitting transducers (6) or at least one group of receiving transducer arrays (5) formed by a plurality of receiving transducers (2) is arranged on the X axis or the Y axis;
(2) the transmitting transducer (6) is driven by the transmitting circuit to transmit a surface acoustic wave signal, and the receiving transducer (2) is controlled by the receiving circuit to receive the surface acoustic wave signal;
(3) when a touch body touches, the surface acoustic wave signal is reflected by the touch body and then reaches the receiving transducer (2), when the intensity of the surface acoustic wave signal is greater than a set threshold value, the receiving circuit sends the surface acoustic wave signal to the central processing unit MCU, and the central processing unit MCU determines the coordinate of the touch body;
a group of transmitting transducer arrays (4) and a group of receiving transducer arrays (5) are respectively arranged on one edge of the X axis or the Y axis, and all transmitting transducers (6) are driven by a transmitting circuit to simultaneously transmit surface acoustic wave signals; the receiving circuit controls all the receiving transducers (2) to simultaneously receive the surface acoustic wave signals, or the receiving circuit controls all the receiving transducers (2) to sequentially and independently receive the surface acoustic wave signals;
when a touch body touches, the surface acoustic wave signal reaches the receiving transducer Y after being reflected by the touch body for 180 degreesiSince the relative position coordinates of each receiving transducer (2) are known, the coordinates of the touch body on the Y axis are YiThe coordinates on the X-axis are: xi= V*(ti-t0)/2；
When a plurality of touch bodies touch, the surface acoustic wave signals reach the receiving transducer (2) after being reflected by the touch bodies for 180 degrees, wherein one receiving transducer YjA plurality of surface acoustic wave signals are received, and the coordinates of a plurality of touch bodies on the Y axis are Y because the relative position coordinates of each receiving transducer (2) are knownjThe coordinates on the X-axis are:
1 st touch body: xj1=V*(tj1-t0)/2；
2 nd touch body: xj2=V*(tj2-tj1)/2+Xj1Or Xj2=V*(tj2-t0)/2；
…………
Nth touch body: xjn= [V*(tjn-tj1)]/2+Xj1Or Xjn=V*(tjn-t0)/2；
Where V is the propagation velocity of the surface acoustic wave signal, Xj1For the coordinate of the first of the plurality of touch objects on the X-axis, t0For transmitting transducersStarting point in time, t, at which the emission of the surface acoustic wave signal beginsiFor the first time point, t, at which the transducer receives a surface acoustic wave signalj1Is YjTime point, t, at which the surface acoustic wave signal of the 1 st touch body is receivedj2Is YjTime point, t, at which the surface acoustic wave signal of the 2 nd touch object is receivedjnIs YjA point of time when the surface acoustic wave signal of the nth touch body is received.
2. The method for realizing real multi-touch of the acoustic wave touch screen according to claim 1, wherein the method comprises the following steps: the receiving transducer array (5) on the X axis or the Y axis or the combination formed by the single receiving transducer (2) and the reflection stripe array (3) is arranged at the transmitting end of the surface acoustic wave signal.
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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 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101719043A (en) * | 2009-12-29 | 2010-06-02 | 成都吉锐触摸技术股份有限公司 | Multi-point surface acoustic wave touch screen |
| CN101874231A (en) * | 2008-02-19 | 2010-10-27 | 韩鼎楠 | Multi-point touch screen and touch detecting method |
| CN101916153A (en) * | 2010-08-04 | 2010-12-15 | 中兴通讯股份有限公司 | Method, device and terminal for positioning touch point of touch screen |
| CN102033641A (en) * | 2009-09-30 | 2011-04-27 | 北京汇冠新技术股份有限公司 | Touch system and multi-point positioning method |
| CN102662535A (en) * | 2011-11-18 | 2012-09-12 | 友达光电股份有限公司 | Display capable of detecting object and control method thereof |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3417053B2 (en) * | 1994-05-23 | 2003-06-16 | セイコーエプソン株式会社 | Touch panel input device and control method therefor |
| US5591945A (en) * | 1995-04-19 | 1997-01-07 | Elo Touchsystems, Inc. | Acoustic touch position sensor using higher order horizontally polarized shear wave propagation |
| JP2002108563A (en) * | 2000-10-04 | 2002-04-12 | Asahi Eng Co Ltd | Large-scaled display of pressurized protected structure |
| JP3970168B2 (en) * | 2002-11-19 | 2007-09-05 | 富士通株式会社 | Touch panel device |
| JP2007065800A (en) * | 2005-08-29 | 2007-03-15 | Seiko Epson Corp | Touch panel device |
| US8243048B2 (en) * | 2007-04-25 | 2012-08-14 | Elo Touch Solutions, Inc. | Touchscreen for detecting multiple touches |
| KR20080099665A (en) * | 2007-05-10 | 2008-11-13 | 에이디반도체(주) | Touch screen using surface acoustic wave |
| CN101344829A (en) * | 2008-08-11 | 2009-01-14 | 韩鼎楠 | Apparatus and method of multi-point touch screen |
| CN202142028U (en) * | 2011-03-31 | 2012-02-08 | 比亚迪股份有限公司 | Multipoint recognition device of reducing-enlarging motion |
| US9304629B2 (en) * | 2011-11-15 | 2016-04-05 | Elo Touch Solutions, Inc. | Radial transducer for acoustic wave touch sensor |
| CN102495700B (en) * | 2011-12-09 | 2015-08-26 | 成都吉锐触摸技术股份有限公司 | The method of recognizing touch points by using acoustic wave touch screen |
-
2013
- 2013-06-14 CN CN201710120570.8A patent/CN106843604B/en active Active
- 2013-06-14 CN CN201310235013.2A patent/CN103472960B/en active Active
- 2013-06-14 CN CN201710121204.4A patent/CN106909257B/en active Active
- 2013-06-14 CN CN201710120856.6A patent/CN106886343B/en active Active
- 2013-06-14 CN CN201710121205.9A patent/CN106843605B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101874231A (en) * | 2008-02-19 | 2010-10-27 | 韩鼎楠 | Multi-point touch screen and touch detecting method |
| CN102033641A (en) * | 2009-09-30 | 2011-04-27 | 北京汇冠新技术股份有限公司 | Touch system and multi-point positioning method |
| CN101719043A (en) * | 2009-12-29 | 2010-06-02 | 成都吉锐触摸技术股份有限公司 | Multi-point surface acoustic wave touch screen |
| CN101916153A (en) * | 2010-08-04 | 2010-12-15 | 中兴通讯股份有限公司 | Method, device and terminal for positioning touch point of touch screen |
| CN102662535A (en) * | 2011-11-18 | 2012-09-12 | 友达光电股份有限公司 | Display capable of detecting object and control method thereof |
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| CN103472960B (en) | 2017-06-06 |
| CN103472960A (en) | 2013-12-25 |
| CN106886343A (en) | 2017-06-23 |
| CN106843605B (en) | 2019-09-27 |
| CN106909257A (en) | 2017-06-30 |
| CN106843604B (en) | 2019-12-24 |
| CN106909257B (en) | 2019-07-05 |
| CN106843605A (en) | 2017-06-13 |
| CN106843604A (en) | 2017-06-13 |
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