CN103092438A - Infrared touch device and multi-touch location method - Google Patents
Infrared touch device and multi-touch location method Download PDFInfo
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- CN103092438A CN103092438A CN2013100330685A CN201310033068A CN103092438A CN 103092438 A CN103092438 A CN 103092438A CN 2013100330685 A CN2013100330685 A CN 2013100330685A CN 201310033068 A CN201310033068 A CN 201310033068A CN 103092438 A CN103092438 A CN 103092438A
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Abstract
The invention provides an infrared touch device and a multi-touch location method. The infrared touch device comprises an infrared emission module, an infrared reception module, a control bus, signal processing units, analog to digital (A/D) converters and a microprocessor in an arrayed mode in longitudinal and transverse directions. According to the corresponding emission module and reception module, each infrared emission tube is connected with an infrared emission module control circuit, each infrared reception tube is connected with N infrared reception module control circuits, wherein each infrared emission tube simultaneously corresponds to N (N>=3) infrared reception tubes to form synchronous multi-angle scanning, and the infrared reception module control circuits are respectively connected with one signal processing unit and one A/D converter. The corresponding multi-touch location method is that after the rapid synchronous multi-angle scanning, the collected data is converted through the A/D converters and input into the microprocessor for processing. The accuracy of multi-touch identification of the infrared touch device is improved, and multi-point writing is achieved.
Description
Technical field
The present invention relates to the infrared touching device field, relate in particular to and a kind ofly can distinguish infrared touching device and the multi-point touch locating method that a plurality of touch points are write operation simultaneously.
Background technology
At present, touch-screen has obtained being widely used in many occasions and field as the input equipment of a kind of replacement or additional common keyboard and mouse.In existing touch-screen, the detection and localization technology that detect to touch the place can be based on different technology, comprise infrared, camera, sound wave etc.
The especially development of computer hardware technology of development along with science and technology, computing machine has powerful function, almost can be applied to any field that we can imagine, and the multiple point touching technology more can facilitate the user to operate computing machine, this just requires touch-screen to support the multiple point touching operation, can detect and identify more than one touch point.Present several technical schemes that realize multiple point touching are 02822048.X as application number, the scheme that 200580011740.4 Chinese patent is announced, and be not suitable for infrared touch panel.For solving the problem of a plurality of touch points of infrared touch panel None-identified, industry has been made many good tries.
Wherein a kind of scheme is, adds the auxiliary positioning means, additionally adds one or two camera as the outward flange at the infrared ray touch screen and distinguishes a plurality of touch points, and this scheme has increased cost, realizes difficulty; Another scheme is to get rid of imaginary point by trajectory analysis, relies on software algorithm to carry out trajectory analysis, after the eliminating imaginary point, real point is carried out the ID coupling.Although without the additional hardware cost, start to write simultaneously for 2 and can't judge, when imaginary point, real point close together, error probability is large.Have person to be " false multiple spot ", generally can only satisfy to touch and use, writing effect is difficult to guarantee.Explain imaginary point as an example of existing Infrared touch screen systems example, this system's light consists of lattice structure in the scanning of infrared touch panel surface matrix, detects when touching, and determines to touch the position coordinates that the grid node position that occurs just can calculate the touch event generation.When two uneven touch points are arranged, system will calculate two horizontal ordinate X values, two ordinate Y values, the combination of horizontal ordinate and ordinate has the 2X2=4 kind, wherein two groups of coordinates are truly to put position coordinates, and other two kinds is the imaginary point position coordinates, and causing the position coordinates that system-computed goes out might not be real position coordinates, not the place of actual touch, cause erroneous judgement.So imaginary point claims again " terrible point ".
Summary of the invention
For solving the problems of the technologies described above, the object of the present invention is to provide and a kind ofly can identify two or more and touch simultaneously the infrared touching device of writing simultaneously.
Another object of the present invention is to provide a kind ofly uses above-mentioned infrared touching device to realize that multiple spot touches the multi-point touch locating method of writing simultaneously simultaneously.
For achieving the above object, the present invention by the following technical solutions:
A kind of infrared touching device, be included in infrared emission module, infrared receiving group, control bus, signal processing unit, A/D converter and the microprocessor arranged on direction in length and breadth, described infrared emission module is connected described control bus and is connected with described microprocessor with the infrared receiving group; Described infrared emission module comprises infrared transmitting tube array and the infrared emission module group controlling circuit of arranging on direction in length and breadth, and one of them infrared transmitting tube connects an infrared emission module group controlling circuit separately; Described infrared receiving group comprises infrared receiving tube array and the infrared receiving group control circuit of arranging on direction in length and breadth, and one of them infrared receiving tube connects N infrared receiving group control circuit separately; In the correspondence of infrared transmitting tube array and infrared receiving tube array, one of them infrared transmitting tube is a corresponding N infrared receiving tube simultaneously, forms synchronous multi-angle scanning;
In above-mentioned, described infrared receiving group control circuit is connected with described microprocessor after connecting successively separately a described signal processing unit and a described A/D converter;
In above-mentioned, N 〉=3.
Preferably, in a described infrared transmitting tube while corresponding N infrared receiving tube, comprise vertical correspondence and tilt corresponding.
Preferably, described infrared receiving group control circuit comprises analog switch and the logic control circuit that is connected with analog switch.
The present invention realizes the localization method of multiple point touching, mainly comprises the steps:
(1), the infrared emission module is chosen the infrared transmitting tube of a passage successively;
(2), simultaneously open a plurality of reception modules, each receives module difference gating and (1) and goes on foot infrared receiving tube corresponding to power valve different angles of choosing;
(3), the infrared transmitting tube chosen begins to launch infrared ray, forms synchronous multi-angle scanning;
(4), by after signal processing unit synchronous acquisition multiple signals value, transfer data to microprocessor by A/D converter;
(5), infrared transmitting tube stops launching infrared ray;
(6), judge whether to have scanned all passages;
(7) scan all passages if step (6) is judged as, analyzed all signal values, determined each position, touch point; Do not scan all passages if be judged as, returned to step (1).
Circulation step (1) is identified the movement locus of each touch point to step (7).
Compared with prior art, the present invention has following beneficial effect:
1, can realize that multiple point touching is located and multiple spot is write simultaneously;
2, Fast synchronization (simultaneously) scanning, infrared emission module and infrared receiving group do not have complicated sequential corresponding relation, easily realize on software.
3, multi-angle scanning can improve the accuracy of identifying multiple point touching;
4, realize that the method for multipoint positioning is simpler, touch point position coordinates convenience of calculation, accurately, reliable.
5, the circuit board kind is few, and regular shape is easy to realize large-scale production.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or description of the Prior Art, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the circuit structure diagram of infrared touching device of the present invention;
Fig. 2 is multi-point touch locating method process flow diagram of the present invention;
Fig. 3 to Fig. 4 is the synchronous multi-angle scanning of multi-point touch locating method of the present invention schematic diagram.
Fig. 5 is that the embodiment of the present invention 2 touch points obtain 3 angle scanning schematic diagram.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
referring to Fig. 1, a kind of infrared touching device, be included in the infrared emission module of arranging on direction in length and breadth, the infrared receiving group, control bus, signal processing unit 4(is i.e. signal processing circuit shown in figure also), A/D converter 5 and microprocessor 2, control bus comprises the emitting mould train control bus and receives the module control bus, the infrared emission module is connected with described microprocessor by the emitting mould train control bus, the infrared receiving group is connected with described microprocessor by described reception module control bus, described infrared emission module comprises infrared transmitting tube array 8 and the infrared emission module group controlling circuit 1 of arranging on direction in length and breadth, one of them infrared transmitting tube connects an identical infrared emission module group controlling circuit 1 separately, described infrared receiving group comprises infrared receiving tube array 9 and the infrared receiving group control circuit 3 of arranging on direction in length and breadth, and one of them infrared receiving tube connects N infrared receiving group control circuit 3 separately, in the correspondence of infrared transmitting tube array and infrared receiving tube array, one of them infrared transmitting tube is a corresponding N infrared receiving tube simultaneously, forms synchronous multi-angle scanning,
In above-mentioned, described infrared receiving group control circuit is connected with described microprocessor after connecting successively separately a described signal processing unit and a described A/D converter;
In above-mentioned, N 〉=3.
Need to prove, the N value of diverse location of the present invention is all simultaneously identical on its value, as connecting separately 3 infrared receiving group control circuits 3 when an infrared receiving tube, simultaneously corresponding 3 infrared receiving tubes of infrared transmitting tube, the N value that below relates to is all.
Preferably, in a described infrared transmitting tube while corresponding N infrared receiving tube, comprise vertical correspondence and tilt corresponding.When so both having guaranteed to contain matrix-scanning, the scanning of other angles is arranged again.
Preferably, described infrared receiving group control circuit comprises analog switch 6 and the logic control circuit 7 that is connected with analog switch 6.
Multi-point touch locating method process flow diagram of the present invention shown in Figure 2 mainly comprises the steps:
(1), the infrared emission module is chosen the infrared transmitting tube of a passage successively;
(2), simultaneously open a plurality of reception modules, each receives module difference gating and (1) and goes on foot infrared receiving tube corresponding to power valve different angles of choosing;
(3), the infrared transmitting tube chosen begins to launch infrared ray, forms synchronous multi-angle scanning;
(4), by after signal processing unit synchronous acquisition multiple signals value, transfer data to microprocessor by A/D converter;
(5), infrared transmitting tube stops launching infrared ray;
(6), judge whether to have scanned all passages;
(7) scan all passages if step (6) is judged as, analyzed all signal values, determined each position, touch point; Do not scan all passages if be judged as, returned to step (1).
Infrared touching device of the present invention can arrange an electronic counter (not shown) that is connected with the infrared transmitting tube array, comes auxiliary judgment above-mentioned steps (6).Corresponding method is:
1), infrared emission channel counts value clear 0;
2), when the channel counts value is shown as 1, the infrared emission module is chosen infrared transmitting tube No. 1, wherein
The channel counts value is corresponding to number number of infrared transmitting tube;
3) open, simultaneously a plurality of reception modules, each receives module gating and the infrared transmitting tube of choosing respectively
The infrared receiving tube that different angles are corresponding;
4), the infrared transmitting tube chosen begins to launch infrared ray, forms synchronous multi-angle scanning;
5), by after signal processing unit synchronous acquisition multiple signals value, transfer data to microprocessor by A/D converter;
6), infrared transmitting tube stops launching infrared ray, the channel counts value increases progressively 1;
7) judge the maximum infrared transmitting tube number whether the channel counts value arranges greater than this device;
8) if step 7) is judged as YES, scanned all passages, analyze all signal values, determine each position, touch point, if for not being, do not scanned all passages, return to step 2).
Certainly, above-mentioned channel counts value can be passed through an independently external unit, and namely described electronic counter carries out, and also the electronic counting function can be set directly on microprocessor directly.
Below discuss in detail how the present invention carries out the multiple point touching location by this infrared touching device and multiple spot is write, only with two point locations, the synchronous scanning of above-mentioned N=3 angular is that example describes in detail, the location, touch point more than 2 can be with reference to this example.
Referring to Fig. 3 and Fig. 4, in infrared touching device, the infrared emission module is chosen an infrared transmitting tube 101, open simultaneously 3 infrared receiving tubes 201,202,203, open corresponding infrared transmitting tube 101, infrared transmitting tube begins to launch infrared ray, form 3 synchronous angle scannings, then 3 infrared receiving tubes are by after signal processing unit synchronous acquisition 3 road signal values separately, A/D converter by separately transfers data to microprocessor, then infrared transmitting tube 101 stops launching infrared ray, completes a passage scanning process; Open another one infrared transmitting tube 102, corresponding infrared receiving tube can be 202,203,204, repeats above-mentioned synchronous multi-angle scanning process again.According in figure shown in arrow, choose successively in order the passage infrared transmitting tube, until after judging that all passages scannings are completed, at all signal values of microprocessor analysis, determine each position, touch point.
Referring to Fig. 5, a reference method of calculating is as follows: can obtain two coordinate figures of X and two ordinate values of Y in the scanning of vertical and horizontal, oblique scanning simultaneously can obtain the relation between Y and X,
Y=X·f(θ）。
The angle that represents of θ such as Fig. 5 wherein, the trigonometric function relation about θ between f (θ) expression ordinate Y and horizontal ordinate X.
Can further determine two touch points allocation (in Fig. 5 shown in stain) really by above-mentioned formula, thereby get rid of imaginary point (in Fig. 5 shown in white point).
According to this routine principle, can sum up: scan from N angle, touch when can identify at least (N-1) individual point.After the position of each touch point of identification, circulation is carried out above-mentioned steps (1) and is identified the movement locus of each touch point to step (7), calculates the movement locus of touch point under the scanning of Fast synchronization multi-angle.The track of judgement touch point need to strictly mate the ID of touch point.The method of touch point ID coupling is as follows:
1) position, movement velocity and the direction known according to each front carried out trajectory analysis, made a prediction in the position of most probable appearance next time.
2) some position and all predicted values of newly detecting, the match condition of utilization mathematical method judging point.
The method can realize by software.
After above-mentioned ID coupling, can realize that multiple spot writes.
Above-described is only a preferred embodiment of the present invention, is not to limit the present invention.The equivalent variations that those of ordinary skill in the art makes according to the record of this instructions; as different in the computation model that the signal value input microprocessor is adopted; so long as utilized the scheme of these claims of Fast synchronization and multi-angle scanning, namely be considered as dropping on protection scope of the present invention.
Claims (5)
1. infrared touching device, be included in infrared emission module, infrared receiving group, control bus, signal processing unit, A/D converter and the microprocessor arranged on direction in length and breadth, described infrared emission module is connected described control bus and is connected with described microprocessor with the infrared receiving group, it is characterized in that: described infrared emission module comprises infrared transmitting tube array and the infrared emission module group controlling circuit of arranging on direction in length and breadth, and one of them infrared transmitting tube connects an infrared emission module group controlling circuit separately; Described infrared receiving group comprises infrared receiving tube array and the infrared receiving group control circuit of arranging on direction in length and breadth, and one of them infrared receiving tube connects N infrared receiving group control circuit separately; In the correspondence of infrared transmitting tube array and infrared receiving tube array, one of them infrared transmitting tube is a corresponding N infrared receiving tube simultaneously, forms synchronous multi-angle scanning;
In above-mentioned, described infrared receiving group control circuit is connected with described microprocessor after connecting successively separately a described signal processing unit and a described A/D converter;
In above-mentioned, N 〉=3.
2. infrared touching device as claimed in claim 1, is characterized in that: in a described infrared transmitting tube while corresponding N infrared receiving tube, comprise vertical correspondence and tilt corresponding.
3. infrared touching device as claimed in claim 2 is characterized in that: described infrared receiving group control circuit comprises analog switch and the logic control circuit that is connected with analog switch.
4. a multi-point touch locating method that adopts the described infrared touching device of claim 1-3 any one, is characterized in that, comprises the steps:
(1), the infrared emission module is chosen the infrared transmitting tube of a passage successively;
(2), simultaneously open a plurality of reception modules, each receives module difference gating and (1) and goes on foot infrared receiving tube corresponding to power valve different angles of choosing;
(3), the infrared transmitting tube chosen begins to launch infrared ray, forms synchronous multi-angle scanning;
(4), by after signal processing unit synchronous acquisition multiple signals value, transfer data to microprocessor by A/D converter;
(5), infrared transmitting tube stops launching infrared ray;
(6), judge whether to have scanned all passages;
(7) scan all passages if step (6) is judged as, analyzed all signal values, determined each position, touch point; Do not scan all passages if be judged as, returned to step (1).
5. multi-point touch locating method as claimed in claim 4, is characterized in that, circulation step (1) is identified the movement locus of each touch point to step (7).
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| CN201310033068.5A CN103092438B (en) | 2013-01-29 | 2013-01-29 | A kind of infrared touching device and multi-point touch locating method |
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| CN201310033068.5A CN103092438B (en) | 2013-01-29 | 2013-01-29 | A kind of infrared touching device and multi-point touch locating method |
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Cited By (6)
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| CN104182092A (en) * | 2014-08-04 | 2014-12-03 | 深圳市巨浪科教设备有限公司 | Positioning method and system for infrared touch screen |
| CN105183238A (en) * | 2014-06-20 | 2015-12-23 | 鸿合科技有限公司 | Handwriting erasing method based on infrared whiteboard, handwriting erasing device and infrared whiteboard thereof |
| CN107820582A (en) * | 2015-04-28 | 2018-03-20 | 唯酷有限公司 | Liquid crystal writing equipment |
| CN109947301A (en) * | 2019-03-19 | 2019-06-28 | 深圳市康冠商用科技有限公司 | Touch localization method and relevant apparatus in a kind of infrared touch frame |
| CN110333801A (en) * | 2019-07-17 | 2019-10-15 | 广州华欣电子科技有限公司 | A kind of infrared touch panel |
| CN112947799A (en) * | 2021-02-02 | 2021-06-11 | 山西大众电子信息产业集团有限公司 | Multi-board communication and multi-path cross scanning device and method for multi-point infrared touch screen |
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| CN105183238A (en) * | 2014-06-20 | 2015-12-23 | 鸿合科技有限公司 | Handwriting erasing method based on infrared whiteboard, handwriting erasing device and infrared whiteboard thereof |
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| CN107820582A (en) * | 2015-04-28 | 2018-03-20 | 唯酷有限公司 | Liquid crystal writing equipment |
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| CN109947301A (en) * | 2019-03-19 | 2019-06-28 | 深圳市康冠商用科技有限公司 | Touch localization method and relevant apparatus in a kind of infrared touch frame |
| CN110333801A (en) * | 2019-07-17 | 2019-10-15 | 广州华欣电子科技有限公司 | A kind of infrared touch panel |
| CN112947799A (en) * | 2021-02-02 | 2021-06-11 | 山西大众电子信息产业集团有限公司 | Multi-board communication and multi-path cross scanning device and method for multi-point infrared touch screen |
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