CN101477429B - Infrared touch screen scanning method - Google Patents
Infrared touch screen scanning method Download PDFInfo
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- CN101477429B CN101477429B CN2009100367931A CN200910036793A CN101477429B CN 101477429 B CN101477429 B CN 101477429B CN 2009100367931 A CN2009100367931 A CN 2009100367931A CN 200910036793 A CN200910036793 A CN 200910036793A CN 101477429 B CN101477429 B CN 101477429B
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Abstract
The invention discloses a scanning method for an infrared touch screen. The method is characterized in that the scanning can be conducted in a sequential manner and a jump manner; whether infrared signals exist or change or not when being blocked is just detected and judged when the jump scanning is conducted; when the system detects the change of returned value of an A/D converter, the jump scanning is immediately converted into the progressive scanning until the A/D returned value does not change, the current scanning sequence number and the A/D value are recorded, and coordinates are calculated or the sequence number and the A/D value are output; when the A/D value does not change, the progressive scanning is immediately converted to the jump scanning in the system; if the phenomenon that the A/D value of the current signals of a receiving tube changes is detected by the system, the steps are repeated until the scanning of infrared emission and receiving geminate transistors on thecomplete touch screen is finished. The invention has the advantages that the time required by the scan period is effectively shortened; and the whole scanning speed is accelerated and the scanning ofthe whole screen range can be kept under the condition that the scanning precision is not impacted.
Description
Technical field
The present invention relates to a kind of infrared touch screen scanning method.
Background technology
Generally be to finish whole screen scanning in the existing infrared touch panel technology with the method that order is lined by line scan, but owing to each infrared of scanning, receiving tube need the regular hour, when size constantly increases, the required time of scan period of finishing a whole screen will be very long, system does not catch up with the translational speed that touches object to the sweep velocity of infrared emission, receiving tube, cause producing the touch-responsive hysteresis phenomenon, its feature obviously finds expression in mouse on the screen and can not follow the translational speed of touch objects and move.In order to address this problem, the method that the fractional scanning of utilizing is arranged in the prior art, infrared emission on the XY axle is about to distribute, receiving tube is divided into some sections and scans the scan period that is shortened whole touch screen separately, but also there is the method can be when not changing original design, only utilize the position range that has object the to touch spotting scaming that circulates, do not shortened the scanning required time of finishing whole screen and other zone of screen is not scanned, this method can effectively shorten the scan period, as patented claim 200610140874.2 and 200710074940.5 is exactly to have utilized this method, because this method is very simple, also be easy to realize, and without any need for hardware being done any change, but adopt this method that certain limitation is also arranged, on its major defect shows that multiple point touching is used.Because it is that sweep limit is dwindled that this method adopts the method in shortening cycle, and do not do whole screen scanning, scanning is only limited to a less dynamic range, when if touch event occurs in beyond this dynamic range, this method had just lost efficacy, unless multiple point touching is caught when whole screen scans, and is to realize multiple point touching otherwise utilize this method.In other words, utilize this method when multiple point touching is used, we must set the service condition of a multiple point touching to the user, this condition is when whole screen scans, the touch of multiple spot must be to touch on the touch screen surface simultaneously, and can not add new touch object after touch, otherwise thrashing, as seen this method limitation is big, also is difficult to realize many people multiple point touching.The present invention proposes a kind of new infrared touch screen scanning method for this reason.
Summary of the invention
The objective of the invention is in order to overcome in the existing infrared ray touching technique scan period long, the shortcoming that response speed is slow provides a kind of effective shortening complete scan required time, keeps each scan period to whole infrared ray catalyst screen scan method of shielding the integrality of scanning simultaneously.
Technical solution of the present invention is: a kind of infrared touch screen scanning method, and it comprises following key step:
A, scan period be when beginning, and sets preliminary sweep starting point and hop interval promptly jump infrared emission, the right quantity of receiving tube;
Whether b, full frame with initialized hop interval sequential scanning detects the A/D converter rreturn value of judging the current sequence number receiving tube and occurs changing during scanning;
C, when the A/D converter rreturn value occurring and change, adjust scan mode for lining by line scan, till A/D converter rreturn value no change, this moment, infrared when writing down current lining by line scan, receiving tube be to sequence number and A/D converter rreturn value, and the A/D rreturn value of output sequence number and this sequence number;
D, return step b,, finish until this scan period according to the sequential scanning of initialized hop interval value.
Scan mode of the present invention is carried out with a kind of jumping mode again, when jump scanning in a sequential manner simultaneously
Can select to utilize high-velocity scanning, but also low-velocity scanning, described high-velocity scanning is meant is not carrying out high-resolution coordinate conversion to the value that A/D converter returned, and not doing any coordinate accurately measures, only detect and judge that infrared signal is subjected to stopping whether existing or not changing and get final product, so when high-velocity scanning, can shorten every pair of infrared emission of scanning, the time that receiving tube is required, when scanning, when system detects A/D and changes, be illustrated in this to emission, receiving tube sequence number position finds to have shelter or object to touch, system transferred low speed to by high-velocity scanning immediately and scanned this moment, transfer formula line by line to simultaneously and by great-jump-forward, when lining by line scan every pair of transmit-receive tube, to have the emission that the A/D value changes will take place, receiving tube sequence number and A/D rreturn value separately thereof export upper computer to after directly outputing to upper computer coordinates computed or the direct coordinates computed of microprocessor again, continue to line by line scan till the A/D of current sequence number rreturn value does not change.When the A/D value does not change, show and scan present position and the scope that touches object of finishing, after this scan and transfer great-jump-forward to by formula line by line and continue scanning, when if system finds that once more the A/D value of current receiving tube signal changes, repeat above step, go round and begin again, on finishing to whole touch screen all infrared, receive till the scanning work to pipe.When above-mentioned high-velocity scanning, scan every pair of emission, the receiving tube required time sweep time weak point more required than low-velocity scanning.
In addition, it also is provided with step e: when next cycle begins, the preliminary sweep starting point is adjusted an infrared emission, receiving tube in order to being sweep starting point, return step b, whole infrared emission in hop interval, receiving tube to all as starting point scanned till, return step a.System also needs the cycle of striding to line by line scan, and this is because after adopting jump scanning, apart from after increasing, will produce the drain sweep phenomenon in sweep spacing when touching dimension of object less than the scanning hop interval.In order to prevent that this class incident from taking place, the present invention has proposed a kind of cycle of striding method of lining by line scan again simultaneously and has been solved the drain sweep phenomenon, remedied the deficiency of great-jump-forward scan method, the described cycle of striding lines by line scan and is meant, when each different whole screen jump scanning cycle begins, the starting point of jump scanning is adjusted in order successively line by line the jump scanning of carrying out current period after infrared tube distance again, the adjustment number of times of this starting point promptly is the quantity of infrared emission in the hop interval, receiving tube, till all emissions in finishing hop interval, reception are adjusted pipe.System goes round and begins again repeats above scan mode.
The described cycle of striding of this patent lines by line scan and of the prior art lining by line scan is diverse two notions, the cycle of striding described in the present invention characteristics of lining by line scan are lined by line scan not to be to occur in the same cycle and are carried out, but take place at different cycles.In great-jump-forward scan mode of the present invention, when scanning is to carry out with sequential scan mode, but not to carry out line by line, but emission, receiving tube are scanned with jumping mode, hop interval distance can be 12 or 3 or n emission, reception to managing, hop interval can be fixed, and also can adjust voluntarily when scanning near the touch objects scope or leaving by software.
Because scan mode that this patent proposes carries out in full frame scope, thus as a plurality of touch points when different times is cut touch-screen, system also can find fast by above-mentioned scan method.
When system is switched mutually, can adopt following dual mode between processing high-velocity scanning and low-velocity scanning:
At step b, c, among the d, the right sequence number of the current infrared ray launches and receives pipe that is scanned begin near before the infrared that is recorded in the cycle, receiving tube is during to sequence number, shorten hop interval gradually until being 0, line by line scan, during shortening hop interval gradually, comprise when lining by line scan, to have the emission that the A/D value changes will take place, receiving tube sequence number and A/D rreturn value separately thereof export upper computer to after directly outputing to upper computer coordinates computed or the direct coordinates computed of microprocessor again, continue to line by line scan till the A/D of current sequence number rreturn value does not change, after this increase hop interval gradually to initial value.So, in each intermittent scanning process, the reception that the variation of A/D converter rreturn value takes place is noted the sequence number of pipe, by the historical data in the comparative analysis record, interpretation movement of objects direction, can realize predicting and being updated in about position that object may occur in the next scan period, in the next scan period, when scanning sequence number is toward or away from the object in-scope of prediction, system just can adjust in advance to hop interval, utilizing the benefit of prediction is to prevent the drain sweep phenomenon, and the imperfection of coordinate can improve scan capture accuracy rate and coordinate precision and avoid Measuring Object the time.In the historical data of being caught, can be by analyze touching the size dimension of object, when finding that the touch objects size is big, system can transfer hop interval big, if size hour, is then turned down.
Another kind of processing mode is: in step b, c, d, when detecting current infrared, receiving tube sequence number the A/D converter rreturn value occurred and changes, directly shorten hop interval for lining by line scan, when lining by line scan every pair of emission, receiving tube sequence number, and export current infrared, receiving tube to sequence number and A/D converter rreturn value thereof; Continue to line by line scan when detecting current infrared, receiving tube A/D converter rreturn value and do not change, directly begin scanning with initialized hop interval to sequence number.This processing mode is not gone to the position of predicting that object may occur, and the amount of respective processor computing has also reduced.
In step c when the A/D rreturn value changes, can be directly output or coordinates computed of its A/D rreturn value immediately with the sequence number of catching, or also can be after finishing whole screen scanning, export upper computer to or directly utilize microprocessor to carry out the coordinate Calculation processing the sequence number that A/D value changes takes place in all several touch point scopes of catching with one batch., calculate the method for touch point coordinate and can accurately measure and calculate coordinate and object size dimension to the coordinate of catching according to patent 03113702.4 described method.
The advantage of patent of the present invention is: can shorten sweep time times over the speed of low-velocity scanning when high-velocity scanning, and when scanning arrives the object position, then transfer to immediately and lining by line scan, and carry out with low speed, improve scanning accuracy, and the coordinate position and the size of accurate Measuring Object.Can the guaranteeing of this method do not influence under the situation of scanning degree of accuracy, accelerated the speed of entire scan, effectively shortened the required time of scan period, and can keep simultaneously scanning to whole screen scope, can't not respond shortcomings such as touch event so can not produce because of dwindling the system that sweep limit causes drain sweep to cause.
Description of drawings
Accompanying drawing 1 is infrared touch panel infrared, receiving tube sequence number Pareto diagram;
Accompanying drawing 2 is the process synoptic diagram of lining by line scan in jump scanning of the present invention and the cycle of striding;
1, infrared emission tube, 2, infrared receiver tube, 3, infrared, receiver pope are arranged sequence number, 4, first intermittent scanning sequence number, 5, second period scanning sequence number, 6, the 3rd intermittent scanning sequence numbers, 7, the 4th intermittent scanning sequence number, 8, period 5 scanning sequence number, 9, the 6th intermittent scanning sequence numbers, 10, the cycle of the striding flow process figure that lines by line scan.
Embodiment
As shown in Figure 1, the infrared touch panel that has the infra-red ray transmitting unit 1 that is distributed in around the screen and receiving circuit board unit 2 to be constituted, comprise that the expelling plate and the dash receiver that are distributed on the Y-axis face, expelling plate and dash receiver on the X-axis are faced, wherein on the expelling plate unit, be distributed with infrared emission tube by sequence number 1 ... N arranges, be distributed with infrared receiver tube on the dash receiver unit by sequence number 1 ... N arranges, wherein infrared emission tube is vertical one by one corresponding with receiving tube, at X, the tube-launched infrared signal of on the Y-axis each can be received by the receiving tube of coaxial correspondence, formation is to pipe, simultaneously also can be according to any a pair of emission of out-of-alignment, receiving tube matches.
Method of the present invention can be derived and be obtained following formula,
Wherein i is the nature variable, i=0,1,2,3 ..., n, b are the sweep starting points in each cycle, and s is a hop interval, and N is a scanning sequence number, and this formula can be known the scan method of expressing this patent.
Consulting Fig. 2, is to utilize above-mentioned formula, the scanning sequence of arranging out number, the scanning simulation process of carrying out sees by knowing among the figure how jump scanning and the cycle of the striding method of lining by line scan carry out, 4 o'clock first scan periods, the starting point of scanning is b=1, and when hop interval was s=3, the sequence number of scanning was 1,4,7,10,13,16 ... N was 5 o'clock second scan periods, the starting point of scanning is b=2, and when hop interval was s=3, the sequence number of scanning was 2,5,8,11,14 ... N, the 3rd 6 o'clock scan period, the starting point of scanning is b=3, when hop interval was s=3, the sequence number of scanning was 3,6,9,12,15 ... N, when coming the 4th scan period 7, the starting point of scanning gets back to 1 again, and hop interval is 3 o'clock, the sequence number of scanning is 1,4,7,10,13,16 ... N, the 5th 8 o'clock scan period, the starting point of scanning is b=2, when hop interval is s=3, the sequence number of scanning is 2,5,8,11,14 ... N, the 6th 9 o'clock scan period, the starting point of scanning is b=3, when hop interval is s=3, the sequence number of scanning is 3,6,9,12,15 ... N.Below weekly in the ordering of phase, can find in each cycle, under different cycles, because of the formed sequence number of lining by line scan of the variation of starting point (1,2,3), (4,5,6), (7,8,9) ... (N-2, N-1, ranking results N) this shows, behind the whole screen of finishing three cycles, the cycle of striding lines by line scan and also finishes simultaneously immediately.
The cycle of the whole screen of above-mentioned scanning approximately is
Wherein be infrared emission on the touch-screen, receive sum as n pipe, s be hop interval promptly jump infrared emission, receive quantity to pipe, T is each infrared emission of high-velocity scanning, receives managing the required time, F is that low speed is lined by line scan the required time, because the scope of blocking receiving tube of touch objects present position is very little, the distance of having only 2 to 3 lamps in actual applications, so the time F that line by line scan required in the touch scope can be very short, can ignore at this, therefore, needed cycle of complete screen of scanning approximately has only needs original
Wherein hop interval cycle of exposing thoroughly more is short more, this shows, according to great-jump-forward scanning method of the present invention is to shorten the scan period of whole screen greatly, owing to adopted and striden the cyclomorphosis sweep starting point, with the emission of failing in last cycle interscan, receiving tube, scan by changing starting point line by line in the several cycles after continuous, the formation described cycle of striding of this patent lines by line scan, realized shortening the purpose of scan period, and the while can keep the scanning to whole screen scope, because the present invention do not adopt the partial sweep mode, can't not respond shortcomings such as touch event so can not produce because of dwindling the system that sweep limit causes drain sweep to cause.
When concrete enforcement method of the present invention, can be according to the flow process described in following examples, and by utilizing microprocessor to realize programming and processing, scanning of emission on the final realization control infrared touch panel, receiving tube according to the described method of this patent, wherein the scanning sequence in the processor includes following steps, be used to specify the feasibility that realizes this patent but the step that provides is examples of implementation, do not represent all invention parts of this patent.
Embodiment 1:
Following steps are according to the flow process shown in Fig. 3, are used for the specific embodiment that software programming just can realize the described scan method of this patent.
A) hop interval is set to initial value, and sweep starting point is 1;
B) according to emission, the receiving tube of set hop interval sequential scanning pairing, enter step C;
C) judged whether the touch coordinate record,, then entered step G if not if then enter step D;
D) sequence number range and current sequence number on touch objects place X, the Y-axis are compared, the sequence number of judging current scanning is to approach or leave the touch objects position, then enters step F if approach; Then enter step e if leave;
E) adjust hop interval with each incremental manner, and enter step G;
F) adjust hop interval in the mode of successively decreasing at every turn, enter step G;
G) whether the rreturn value that detects current receiving tube signal A/D converter changes, if then enter step H, then enters step J if not;
H) the sequence number position of recorder pipe, the sequence number in the current sequence number that is scanned and last one or several cycle is compared, calculate the X of object, the moving direction on the Y-axis, and upgrade the sequence number range on touch objects place X, the Y-axis, enter step I;
I) calculate touch objects X, Y accurate coordinates or export sequence number and AD value to upper computer, enter step J;
J) judge whether to finish whole touch screen scanning,, return step B if not if enter step K;
K) sweep starting point=sweep starting point+1 is set, enters step L;
L) number of times that judge to adjust sweep starting point whether 〉=hop interval, if then continue next step M, then enter step N if not;
M) sweep starting point is set to 1, removes sweep starting point and adjusts number of times, returns step B.
N) the writing scan starting point is adjusted number of times, returns step B;
In above embodiment 1, for fear of the drain sweep phenomenon that causes greater than touch objects because of hop interval, so program has comprised the cycle of the striding method of lining by line scan, step wherein be by step K to step N, i.e. the flow process part of mark 10 indications in Fig. 3.If when not needing to utilize the cycle of striding to line by line scan method, after program can be finished by step J, the replacement sweep starting point was 1, and returns step B and get final product.
Following steps are according to flow process shown in Figure 4, are used for software programming and just can realize another embodiment of the described scan method of this patent.
A) system's hop interval is set to initial value, and starting point is made as 1;
B), continue next step C according to set hop interval sequential scanning infrared emission, receiving tube;
C) judge that whether current receiving tube signal A/D converter rreturn value changes, if then enter step F, then continues next step D if not;
D) judge whether that current receiving tube signal stops to change after the receiving tube signal changes continuously,, then enter step I if not if then enter next step E;
E) replacement hop interval enters step I;
F) hop interval is adjusted into 0, continues next step G;
G) sequence number of recorder pipe and A/D value continue next step H;
H) calculate touch objects X, Y accurate coordinates or directly export sequence number and A/D value to upper computer, continuation next step I;
I) judge whether to finish the scanning of whole touch screen,, return step B if not if enter next step J;
J) sweep starting point=sweep starting point+1 is set, continues next step K;
K) number of times that judge to adjust sweep starting point whether 〉=hop interval, if then continue next step L, then enter step M if not;
L) sweep starting point is set to 1, removes sweep starting point and adjusts number of times, returns step B.
M) the writing scan starting point is adjusted number of times, returns step B;
In above embodiment 2, for fear of the drain sweep phenomenon that causes greater than touch objects because of hop interval, so program has comprised the cycle of the striding method of lining by line scan, step wherein be by step J to step M, i.e. the flow process part of mark 10 indications in Fig. 4.If when not needing to utilize the cycle of striding to line by line scan method, after program can be finished by step I, the replacement sweep starting point was 1, and returns step B and get final product.
In above two embodiment, can add the function of inspected object size, hop interval also can be adjusted according to the touch objects size, but a kind of programmed method of adjusting hop interval of reference example make amendment and get final product, do not elaborate at this.
From the implementation process of above two embodiment, if because of program circuit design has unreasonable place or because of inconsiderate when causing partly the mistakes and omissions situation occurring, do not represent this patent to implement, and, do not negate the implementation result of this patent therefore also promptly because of it does not relate to the ultimate principle and the framed structure of this patent.
When realization is of the present invention, catch the sweep velocity order of emission, receiving tube by utilizing infrared imaging device at a high speed.The infrared imaging device can also be by visual inspection when scanning near capture range simultaneously, and high-velocity scanning transfers low-velocity scanning to, jump scanning transfers scanning process line by line to, utilizes infreared imaging device to help the reliability of debugged program.
Claims (5)
1. infrared touch screen scanning method, it is characterized in that: it may further comprise the steps:
A, scan period be when beginning, and sets preliminary sweep starting point and hop interval promptly jump infrared emission, the right quantity of receiving tube;
B, full frame with initialized hop interval sequential scanning only detects during scanning and judges whether the A/D converter rreturn value occurs changing;
C, when detecting current infrared, receiving tube sequence number the A/D converter rreturn value occurred and changes, directly shorten hop interval and be 0 and line by line scan, and write down current infrared, receiving tube sequence number and A/D converter rreturn value; When detecting current infrared, the receiving tube A/D converter rreturn value to sequence number and do not change, directly the hop interval with initialization value begins scanning;
D, return step b,, finish until this scan period according to initialized hop interval sequential scanning.
2. a kind of infrared touch screen scanning method according to claim 1, it is characterized in that: it also is provided with step e: when next cycle begins, the preliminary sweep starting point is adjusted an infrared emission, receiving tube in order to being sweep starting point, return step b, whole infrared emission in hop interval, receiving tube to all as starting point scanned till, return step a.
3. according to a kind of infrared touch screen scanning method described in claim 1 or 2, it is characterized in that:
Among the step c, when lining by line scan every pair of transmit-receive tube, emission, receiving tube sequence number and the A/D rreturn value separately thereof that will have generation A/D value to change directly exported or directly exported behind the coordinates computed again, continues to line by line scan till the A/D of current sequence number rreturn value no change.
4. according to a kind of infrared touch screen scanning method described in claim 1 or 2, it is characterized in that: among step b, c, the d, the right sequence number of the current infrared ray launches and receives pipe that is scanned near before the infrared, receiving tube that are recorded in the cycle during to sequence number, shorten hop interval gradually until being 0, line by line scan, and write down current infrared, receiving tube sequence number and A/D converter rreturn value; When A/D converter rreturn value no change, increase hop interval gradually to initialization value.
5. a kind of infrared touch screen scanning method according to claim 1 and 2 is characterized in that: described hop interval value is proportional to sequence number quantity with the infrared, the receiving tube that write down before.
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| CN2009100367931A CN101477429B (en) | 2009-01-20 | 2009-01-20 | Infrared touch screen scanning method |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101714041B (en) * | 2009-11-04 | 2011-10-05 | 深圳市山鹰科技有限公司 | Method for prolonging service life of infrared touch screen |
| CN101719042B (en) * | 2010-01-14 | 2012-02-22 | 广东威创视讯科技股份有限公司 | Method for improving scanning speed of infrared touch screen |
| TW201220164A (en) * | 2010-11-04 | 2012-05-16 | Raydium Semiconductor Corp | Detection method of multi-touch for touch panel and related detecting apparatus thereof |
| CN102305924A (en) * | 2011-06-24 | 2012-01-04 | 广州视睿电子科技有限公司 | Infrared positioning method and apparatus |
| CN103455194B (en) * | 2013-02-04 | 2016-12-28 | 南昌欧菲光科技有限公司 | touch screen scanning method, system and device |
| CN103761013A (en) * | 2014-02-17 | 2014-04-30 | 广州市泰奇克光电科技有限公司 | Random skipping type local area detecting locating method for infrared screen |
| CN108920026B (en) * | 2018-05-03 | 2021-06-22 | 业成科技（成都）有限公司 | Touch screen scanning method, computer device and storage medium |
| CN111078060B (en) * | 2020-01-31 | 2022-06-03 | 广东新空电子科技股份有限公司 | Infrared touch frame jump scanning method, circuit, touch frame and electronic equipment |
| CN112799546B (en) * | 2021-01-26 | 2024-05-31 | 广州创知科技有限公司 | Touch detection method and device, interaction panel and storage medium |
| CN113274688B (en) * | 2021-05-14 | 2022-05-10 | 合肥工业大学 | Long jump testing system based on flexible electronic switch array |
| CN114415853A (en) * | 2021-12-08 | 2022-04-29 | 深圳市鸿合创新信息技术有限责任公司 | Touch point position determining method and device and electronic equipment |
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