CN101995997A - Multipoint infrared touch screen and touch positioning method thereof - Google Patents
Multipoint infrared touch screen and touch positioning method thereof Download PDFInfo
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- CN101995997A CN101995997A CN2009101124091A CN200910112409A CN101995997A CN 101995997 A CN101995997 A CN 101995997A CN 2009101124091 A CN2009101124091 A CN 2009101124091A CN 200910112409 A CN200910112409 A CN 200910112409A CN 101995997 A CN101995997 A CN 101995997A
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Abstract
The invention relates to a multipoint infrared touch screen. A plurality of infrared receiving units and infrared emission units are arranged on frames around the display surface of the multipoint infrared touch screen according to a certain sequence so as to form a vertically corresponding relation. The method for implementing the positioning of multipoint touch comprises the following steps of: starting the emission units on two opposite frames and finishing normalization of the receiving units; judging whether the touch screen generates touch deflection or not; switching the infrared emission units and three infrared receiving units corresponding to the emission units on in turn, and storing all values of a scanning receiving unit; reading a scanning value vertical to the scanning receiving unit, and comparing the scanning value with a normalized value; judging whether a touch point can be determined or not; further judging a possible touch point which is not accurately judged by using an infrared scanning record value which has a negative 45-degrees inclination angle; further judging uncertain individual touch points which are not accurately judged in the preceding step by using an infrared scanning record value which has a positive 45-degrees inclination angle; and finishing one scanning judgment cycle, and repeatedly starting a new cycle of multipoint touch judgment. The method has the advantages of uniform infrared coverage, clear inclination angle and no scanning dead angle.
Description
Technical field
The present invention relates to a kind of multiple spot infrared touch panel, particularly a kind of multiple spot infrared touch panel and the touch localization methods thereof that can accurately judge a plurality of touch points of operating simultaneously.
Background technology
Current, along with the continuous breakthrough of the raising of economic level and science and technology, all trades and professions to the demand of multiple spot infrared touch panel also in continuous increase.And the development of multiple point touching technology also will certainly promote the development of other industry.The multiple spot infrared touch panel can be simulated the common mouse keyboard as a kind of, realizes people and the mutual emerging means of equipment, in mobile phone, telecommunications inquiry, meeting displaying etc. utilization is widely arranged all.We can say simple, the lower-cost touch interactive device of a kind of production technology based on ultrared multi-point touch panel.
Application number 200710028616.X, publication number CN101071356A disclose " a kind of infrared touch panel and multi-point touch locating method thereof ", it is characterized in that: at least one detection side at touch-screen makes progress, and has corresponding two red chromatographys of the infrared emission scan circuit of a cover to receive sweep circuit outward; The light that the infrared emission component of one cover in the infrared emission scan circuit sends is received a infrared receiver component in the sweep circuit outward by a red chromatography and receives when detecting, and is also received a infrared receiver component in the sweep circuit outside the other red chromatography and receive and detect in range of receiving.This circuit structure does not take into full account the judgement of touch-screen edge and touch point, four angles, can not judge the dead angle of multiple spot.Application number 200810025705.3, publication number 101226446A disclose " infrared touch panel and multi-point touch locating method ", it is characterized in that: upwards at least one detection side, infrared emission component and infrared receiver component are all towards the direction deflection of touch screen center, make infrared emission component and infrared receiver component towards relative, form the corresponding relation of intersecting.Its shortcoming is to touch infrared grid and distributes evenly inadequately, and central area density is more, increases to touch reaction time, and judges limitedly in the touch point, edge, can not reach the precision of central area.
Summary of the invention
The object of the present invention is to provide a kind of infrared ray evenly to cover, do not stay the multiple spot infrared touch panel and the touch localization method thereof at scanning dead angle, overcome the prior art middle infrared (Mid-IR) and covered inhomogeneous, as to have scanning dead angle problem.
For achieving the above object, the present invention is by the following technical solutions:
A kind of multiple spot infrared touch panel is characterized in that: be provided with some infrared receivers and infrared emission unit in a certain order on the frame around multiple spot infrared touch panel surface, form vertically opposite should the relation.
On a frame, be provided with the infrared emission unit and the infrared receiver of equal number simultaneously, each frame is divided into identical halves, a copy of it is an infrared emission unit, another part is infrared receiver, corresponding frame is provided with infrared receiver and infrared emission unit to correspondence, forms receiving element and transmitter unit to corresponding relation.
Equal portions are provided with infrared emission unit and infrared receiver on the described frame, refer to that equal portions are provided with infrared emission unit circuit board and infrared receiver circuit board, have been divided into two independently logical circuits to them by hardware.
The adjacent frame of frame is provided with and its corresponding unit, forms to corresponding relation, presents the arrangement mode that infrared receiver group and infrared emission unit group alternately occur around being formed on the frame.
Corresponding relation between infrared emission unit and the infrared receiver, comprise over against should with become positive and negative 45 jiaos corresponding relation.Adopt emission angle to become 90 to spend to the emission infrared unit between 95 degree for general infrared touch panel, the infrared emission unit of utilization sequential control or different frequency just can be got rid of the infrared interference of adjacent transmission unit.Can become transmitter unit 45 degree deflections to install with receiving element on the bigger touch-screen, can avoid the interference of adjacent infrared light on the big touch-screen, reach big touch-screen and can realize that also multiple spot accurately touches judgement and can erroneous judgement not occur owing to infrared ray disturbs.
For big touch-screen each above-mentioned transmitter unit and receiving element are divided into three independently sweep circuit unit, use less infrared emission angle, infrared energy is concentrated on the relative receiving element preferably, effectively avoid the difference of screen size and the difference on effect that causes.
Circuit design like this, at least one detection side upwards on the multiple spot infrared touch panel, the sweep circuit that corresponding three receiving elements of an infrared emission unit are arranged, emission scan circuit on corresponding other three frames of receiving element sweep circuit on frame is realized the combination of three infrared receivers of an infrared emission unit correspondence.An infrared emission unit in one group of infrared emission sweep circuit on frame sends infrared ray and can be received and detect by corresponding receiving element in the infrared reception sweep circuit on the different frames simultaneously, will produce three different reception sweep circuit detected touch point on three different limits.The receiving element quantity on each frame and the quantity of transmitter unit equate that all when connecting infra-red ray transmitting unit one by one, corresponding three receiving element sweep circuits are connected and received.
The effect that the present invention is created on the display screen is the touch area that touch-screen has been divided into uniform lattice, each point on the touch-screen all has at least four infrared rays accurately to pass through, so, relevant judgement to less (four point in) touch point can have multiple sequential working, also can have multiple ultrared linear function combination to be used to judge the existence of different touch points.
Corresponding with this circuit structure, multiple spot infrared touch panel software of the present invention realizes going up the employing algorithm of estimation in advance, as long as in the time of in scanning, can accurately determining touch point position, stop current current scanning to the judgement touch point, begin to carry out and judge touch point position next time.So just can effectively utilize the time, shorten the scan period, accelerate the corresponding time the touch point.
Corresponding above-mentioned circuit structure, the present invention realizes that the localization method of multiple point touching mainly may further comprise the steps:
(1) transmitter unit on the startup two opposite edges frame is finished the normalization to receiving element;
(2) open checking routine, a verification is done in the touch point that provides on the touch-screen, judge whether touch-screen skew takes place to touch;
(3) in a scan period, connect infrared emission unit successively, connect three infrared receivers of corresponding transmitter unit simultaneously according to certain time sequence, preserve all values of scanning receiving element;
(4) read with infrared emission unit over against the receiving element scan values, and with normalized value relatively; If inequality with normalized value, then can judge has touch event to take place, and judges whether to determine the touch point;
(5) compare with initialization by this some value that the corresponding receiving element of positive 45 degree angles institutes preserves that tilts possible the touch point to not having in the step (4) accurately to judge, if inequality with initialization value, then this point has the touch generation;
(6) the indivedual touch points to still not determining in the step (5), another value and initialization of tilting the corresponding receiving element preservation of negative 45 degree infrared rays institutes by this point compares, if different, can judge that then this point one is decided to be the touch point with initialization value;
(7) the single pass judgement cycle finishes, the new cycle criterion multiple point touching of repeating step (3)-(6) beginning.
Whether step (2) verification touch-screen is in order to judge whether touch-screen can use before realizing multiple point touching, corresponding good to the touch of each point of touch-screen, as a kind of supplementary means, only does once just passable when opening multi-point touch panel.Step (5) (6) is not all can carry out each scan period, if just can make accurate judgement to the touch point in step (4), then just there is no need execution in step (5) (6) again, can accelerate the corresponding time.The angle of 45 degree that step (5) (6) is mentioned, be for linear function (y (x)=tan45*x+h or y (x)=tan (180-45) * x+h) the corresponding tilt angle that realizes forming by infrared ray be that 1 (tan45=1) designs, not only can on calculating, obtain accurate touch point and also can on function algorithm, oversimplify, implement easily.Control to angle promptly makes that to the control of slope eternal is positive and negative 1.
Through above-mentioned circuit structure and multi-point touch locating method, infrared touch panel just can be distinguished the exact position of simultaneously a plurality of touch points operation, multiple point touching is positioned on the infrared touch panel and is achieved, just can obtain the touch operation of multiple spot on this basis, for example the amplification of picture is dwindled and to the rotation of picture etc., realized the complex operations that single-point can't be finished.
Compare with existing infrared ray touching technique, the present invention has following beneficial effect:
1, on the existing hardware basis, only done the adjustment of relative transmitter unit and receiving element position, itself do not increased new hardware, do not needed to increase hardware cost, just can realize multiple point touching is made accurate localization.
2, upwards at least one detection side, infrared emission unit and infrared ray receiving element all towards relativity shift positive and negative 45 the degree angle to extrinsic deflection, form relative corresponding relation, be formed on the uniform infrared ray of grid on the entire display screen, can be balanced on the whole touch screen, the zone that can't judge can not appear.
3, infrared ray linear functional relation formula slope value is reached very desirable value, do not had approximate value in the calculating, accurately each touch point position.
4, the judgement of each touch point all has four Linear Functional Equations to pass through, and can have multiple linear combination mode to judge the position, touch point.
Description of drawings: the black triangle is infrared receiving end, and white triangles is the infrared emission end
Fig. 1 is an embodiment of the invention electrical block diagram;
Fig. 2 is that three infrared rays of an infra-red ray transmitting unit correspondence of the present invention are accepted cell schematics;
Fig. 3 is that the infra-red ray transmitting unit correspondence is accepted cell schematics on frame of the present invention;
Fig. 4 is that the relative infra-red ray transmitting unit correspondence of the present invention is accepted cell schematics;
Fig. 5 is a verification touch-screen synoptic diagram of the present invention;
Fig. 6 is the location positioning synoptic diagram that the present invention determines one of them point;
Fig. 7 is that the present invention judges may the touch area synoptic diagram;
Fig. 8 is infrared emission unit of the present invention and infrared receiver corresponding relation synoptic diagram;
Fig. 9 is horizontal infrared ray of the present invention and vertical infrared ray synoptic diagram;
Figure 10 is that infrared ray of the present invention is to left-external side deflection (bearing) 45 degree angle synoptic diagram;
Figure 11 is infrared ray of the present invention outside deflection (just) to the right 45 degree angle synoptic diagram;
Figure 12 is that widescreen design of the present invention realizes synoptic diagram;
Figure 13 is a multi-point touch locating method schematic flow sheet of the present invention.
Embodiment
Below in conjunction with Fig. 1-Figure 13 the present invention is further detailed.
As Fig. 1, around multiple spot infrared touch panel surface, be provided with infrared receiver 201,202,203,204 and infrared emission unit 101,102,103,104 in a certain order on the frame, form vertically opposite should the relation.
The infrared emission unit 101 and the infrared receiver 201 of equal number on top have been provided with on the frame simultaneously, upper side frame is divided into identical halves, a copy of it is an infrared emission unit 101, another part is infrared receiver 201, the lower frame correspondence is provided with infrared receiver 203 and infrared emission unit 103, receiving element 203 and transmitter unit 101 be to corresponding, and receiving element 201 and transmitter unit 103 are to corresponding.The infrared emission unit 104 and the infrared receiver 204 of equal number have been provided with on the on the left side frame simultaneously, left frame is divided into identical halves, a copy of it is an infrared emission unit 104, another part is infrared receiver 204, the left frame correspondence is provided with infrared receiver 202 and infrared emission unit 102, receiving element 202 and transmitter unit 104 be to corresponding, and receiving element 204 and transmitter unit 102 are to corresponding.Around infrared receiver 201,202,203,204 and alternately arrangement of infrared emission unit 101,102,103,101 on the frame.
Infrared emission unit 101,102,103,104 is the infrared emission unit circuit board, and infrared receiver 201,202,203,204 is the infrared receiver circuit board.
All be to be evenly distributed with infrared grid and all to have four linear infrared equations to pass through on the whole touch screen, thereby can have multiple sequential to judge the method for touch point the judgement of each point.And the infrared ray slope of each infrared emission end and these 2 compositions of receiving end can remain on 45 degree angles.On the algorithm of realizing y (x)=tan45*x+h, can very easily just can obtain accurate touch point like this, rather than obtain a possible touch area.
As Fig. 1, infrared order unit 202,203,204 on infrared transmitter unit 101 corresponding other three frames of on the upper side frame a cover, infrared order unit 201,202,204 on infrared transmitter unit 103 corresponding other three frames of on the lower frame a cover, infrared order unit 201,202,203 on infrared transmitter unit 104 corresponding other three frames of on the left frame a cover, the infrared order unit 201,203,204 on infrared transmitter unit 102 corresponding other three frames of the cover of one on the left frame.
As Fig. 2, each different infrared receiving end in the pairing infrared receiver 201,202,203 of an infrared emission end in the infrared transmitter unit 104 of a cover of left frame.
As Fig. 3, the scan values of the infrared and preservation receiving element 204 that the corresponding receiving element 204 receipts transmitting terminals 101,103 of (each 45 degree up and down) send at Cheng Jiushi degree angle can be judged the possible touch point on these three infrared rays then as required.
Corresponding relation between infrared emission unit and the infrared receiver, comprise over against should with become positive and negative 45 jiaos corresponding relation, as infrared emission unit 101 and infrared receiver 203 over against should, infrared emission unit 101 is corresponding with 204 one-tenth positive 45 jiaos of infrared receivers, and infrared emission unit 101 is corresponding with 202 one-tenth negative 45 jiaos of infrared receivers.
According to said structure, take following touch localization method:
(1) as Fig. 4, start the transmitter unit 101,103 on the two opposite edges frame, finish normalization (initialization) to four frame receiving elements 201,202,203,204;
(2) as Fig. 5, open checking routine, the point of right-angled intersection can appear on the display screen, the user can click each point, judge whether touch-screen skew takes place to touch, if not skew of infrared ray illustrates that then infrared multi-point touch screen can realize the accurate location that touches;
For white roundlet shown in Figure 6 as a touch point, as figure all infrared rays that drawn by this touch point.Any as can be seen two infrared rays combination can be judged this touch point of white roundlet.
For shown in Figure 7 be a rectangular touch zone, or the multiple point touching in the rectangular touch zone, as can be seen in the rectangular area each point can be evenly by four (y (x)=x+w or y (x)=tan45*x+h) (and w and h be meant with respect to X the relative distance of Y-axis) infrared ray.Can judge accurately this rectangular area like this.
(3) as Fig. 8, in a scan period, connect infrared emission unit 101,102,103,104 successively, connect the infrared receiver 203,204,201,202 of corresponding transmitter unit simultaneously according to certain time sequence, preserve all values of scanning receiving element, can set up the data value of each point according to the form of setting up two-dimensional array, Fig. 8 is the infrared ray numerical value of each transmitting terminal or receiving end correspondence as can be seen;
(4) as Fig. 9, read with infrared emission unit over against the receiving element scan values, and with normalized value relatively; If inequality with normalized value, then can judge has touch event to take place, and judges whether to determine the touch point;
(5) as Figure 10, to possible the touch point that does not have in the step (4) accurately to judge, compare with initialization by this some value that the corresponding receiving element of positive 45 degree angles institutes preserves that tilts, if inequality with initialization value, then this point has the touch generation;
(6) as Figure 11, to indivedual touch points of still not determining in the step (5), the value and the initialization of preserving by another corresponding receiving element of negative 45 degree infrared rays institutes that tilts of this point compare, and as if different with initialization value, can judge that then this point one is decided to be the touch point;
(7) the single pass judgement cycle finishes, the new cycle criterion multiple point touching of repeating step (3)-(6) beginning.
The solution that legend all designs for Fang Ping in this patent as shown in figure 12, changes a little, and the art of this patent promptly can be applicable to widescreen.
Each point of the art of this patent all is identical to the induction that touches, and the touch on whole screen does not all have the dead angle, does not have the different problem of zones of different sensitivity of screen.Also simple relatively for realizing on the algorithm of software, all be identical to the algorithm of each point.Do not have because the different funtcional relationship of the different generations of the Linear Functional Equations slope that different points passes through.
Obviously; those of ordinary skill in the art is according to technical know-how of being grasped and customary means; according to above said content, can make the various ways that does not break away from basic fundamental thought of the present invention, these pro forma changes and non-material change include within the protection domain of this patent.
Claims (7)
1. a multiple spot infrared touch panel is characterized in that: be provided with some infrared receivers and infrared emission unit in a certain order on the frame around multiple spot infrared touch panel surface, form vertically opposite should the relation.
2. a kind of multiple spot infrared touch panel as claimed in claim 1, it is characterized in that: the infrared emission unit and the infrared receiver that on a frame, have been provided with equal number simultaneously, each frame is divided into identical halves, a copy of it is an infrared emission unit, another part is infrared receiver, corresponding frame correspondence is provided with infrared receiver and infrared emission unit, forms receiving element and transmitter unit to corresponding relation.
3. a kind of multiple spot infrared touch panel as claimed in claim 2 is characterized in that: equal portions are provided with infrared emission unit circuit board and infrared receiver circuit board on the frame, by hardware they have been divided into two independently logical circuits.
4. a kind of multiple spot infrared touch panel as claimed in claim 1, it is characterized in that: the adjacent frame of frame is provided with and its corresponding unit, present the arrangement mode that infrared receiver group and infrared emission unit group alternately occur, formation is to corresponding relation, corresponding three receiving elements of transmitter unit, three receiving elements are respectively over against receiving element of answering and two different receiving elements that become positive and negative 45 degree deflections, when infrared transmitter unit is launched one time, can receive data by corresponding three receiving elements that have.
5. as claim 1,2 or 4 described a kind of multiple spot infrared touch panels, it is characterized in that: the corresponding relation between infrared emission unit and the infrared receiver, comprise over against should with become positive and negative 45 jiaos corresponding relation, adopt emission angle to become 90 to spend for general infrared touch panel, can become transmitter unit 45 degree deflections to install with receiving element on the bigger touch-screen to the emission infrared unit between 95 degree.
6. as claim 1 or 4 described a kind of multiple spot infrared touch panels, it is characterized in that: each above-mentioned transmitter unit and receiving element are divided into three independently sweep circuit unit for big touch-screen, use less infrared emission angle, infrared energy is concentrated on the relative receiving element preferably, effectively avoid the different and difference on effect that causes of screen.
7. multiple spot infrared touch panel touch localization method is characterized in that:
Comprise the steps:
(1) transmitter unit on the startup two opposite edges frame is finished the normalization to receiving element;
(2) open checking routine, a verification is done in the touch point that provides on the touch-screen, judge whether touch-screen skew takes place to touch;
(3) in a scan period, connect infrared emission unit successively, connect the infrared receiver of corresponding transmitter unit simultaneously according to certain time sequence, preserve all values of scanning receiving element;
(4) read with infrared emission unit over against the receiving element scan values, and with normalized value relatively; If inequality with normalized value, then can judge has touch event to take place, and judges whether to determine the touch point;
(5) compare with initialization by this some value that the corresponding receiving element of positive 45 degree angles institutes preserves that tilts possible the touch point to not having in the step (4) accurately to judge, if inequality with initialization value, then this point has the touch generation;
(6) the indivedual touch points to still not determining in the step (5), another value and initialization of tilting the corresponding receiving element preservation of negative 45 degree infrared rays institutes by this point compares, if different, can judge that then this point one is decided to be the touch point with initialization value;
(7) the single pass judgement cycle finishes, the new cycle criterion multiple point touching of repeating step (3)-(6) beginning.
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| CN2009101124091A CN101995997A (en) | 2009-08-21 | 2009-08-21 | Multipoint infrared touch screen and touch positioning method thereof |
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| CN2009101124091A CN101995997A (en) | 2009-08-21 | 2009-08-21 | Multipoint infrared touch screen and touch positioning method thereof |
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| CN102419663A (en) * | 2011-08-03 | 2012-04-18 | 北京汇冠新技术股份有限公司 | Multipoint identification method and system for infrared touch screen |
| CN102419664A (en) * | 2011-08-03 | 2012-04-18 | 北京汇冠新技术股份有限公司 | Multi-point identification method and system of infrared touch screen |
| CN102495694A (en) * | 2011-11-25 | 2012-06-13 | 广州视睿电子科技有限公司 | Contact scanning method and scanning device for infrared geminate transistor touch screen and touch screen system |
| CN102693048A (en) * | 2012-05-31 | 2012-09-26 | 安徽大学 | Infrared touch screen |
| CN103092438A (en) * | 2013-01-29 | 2013-05-08 | 厦门印天电子科技有限公司 | Infrared touch device and multi-touch location method |
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| CN102693048A (en) * | 2012-05-31 | 2012-09-26 | 安徽大学 | Infrared touch screen |
| CN102693048B (en) * | 2012-05-31 | 2015-06-17 | 安徽大学 | Infrared touch screen |
| CN103092438A (en) * | 2013-01-29 | 2013-05-08 | 厦门印天电子科技有限公司 | Infrared touch device and multi-touch location method |
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| CN104407395A (en) * | 2014-12-06 | 2015-03-11 | 周振 | Infrared sensing microplate indicator |
| CN105549796A (en) * | 2015-12-15 | 2016-05-04 | 中航华东光电有限公司 | Touch screen and touch positioning method |
| CN105549796B (en) * | 2015-12-15 | 2018-11-13 | 中航华东光电有限公司 | A kind of touch screen and its touch localization method |
| CN106226641A (en) * | 2016-08-30 | 2016-12-14 | 温岭甬岭水表有限公司 | Device for rapidly detecting open circuit of infrared receiving tube |
| CN108008864A (en) * | 2017-11-28 | 2018-05-08 | 暨南大学 | Infrared touch panel touch localization method and device |
| CN108008864B (en) * | 2017-11-28 | 2020-11-10 | 暨南大学 | Touch positioning method and device for infrared touch screen |
| CN108172146A (en) * | 2017-12-26 | 2018-06-15 | 深圳橙立科技有限公司 | A kind of interaction panel and its method |
| CN108172146B (en) * | 2017-12-26 | 2020-07-10 | 深圳橙立科技有限公司 | Interactive display board and method thereof |
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