CN105094463A - Infrared touch screen and scanning method thereof - Google Patents
Infrared touch screen and scanning method thereof Download PDFInfo
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- CN105094463A CN105094463A CN201510437473.2A CN201510437473A CN105094463A CN 105094463 A CN105094463 A CN 105094463A CN 201510437473 A CN201510437473 A CN 201510437473A CN 105094463 A CN105094463 A CN 105094463A
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Abstract
The invention relates to an infrared touch screen and a scanning method thereof. The method comprises following steps: carrying out parallel scanning operation on the infrared touch screen and judging the number of touch points; selecting a scanning mode based on the number of touch points; and recognizing the touch points. By utilization of the infrared touch screen and the scanning method thereof, the number of the touch points is firstly judged and the touch points are recognized by selecting the scanning mode based on the number of the touch points. Therefore, high frame rate can be obtained during scanning whatever the number of the touch points is so that usage effect is greatly improved.
Description
Technical field
The present invention relates to technical field of touch control, particularly the infrared touch screen of one and scan method thereof.
Background technology
Infrared touch screen, mainly installs some to infrared transmitting tube and infrared receiving tube on the frame of screen, carrys out by the control module of infrared touch screen inside the detection that gating infrared transmitting tube and infrared receiving tube realize touch point.
Scan pattern in the scan method of existing infrared touch screen comprises serial scan and parallel scan, the gating infrared transmitting tube of serial scan serial in scanning process and corresponding infrared receiving tube, along with increasing of touch point, need to carry out Multiple-Scan, all touch points can be detected, scanning frame per second can significantly decline, and sweep velocity reduces, thus affects touch control detection effect; The gating infrared transmitting tube that parallel scan is parallel in scanning process and infrared receiving tube, the complete scan time is once identical, but when touch point is less, its frame per second is than low during serial scan for it, and its Detection results is also poor.Need now one badly and be applicable to single-point and multiple spot simultaneously, and there is infrared touch screen and the scan method thereof of better effects.
Summary of the invention
Based on this, be necessary to provide one to be applicable to single-point and multiple spot simultaneously, and there is infrared touch screen and the scan method thereof of better effects.
A kind of infrared touch screen scan method, in order to the scanning to infrared touch screen, it comprises the following steps: carry out parallel scan to described infrared touch screen, obtains the quantity of touch point; According to the quantity of touch point, select scan pattern; Identify touch point.
Wherein in an embodiment, according to the quantity of described touch point, the step of scan pattern is selected to comprise: when the quantity obtaining touch point is one, to carry out serial scan to described infrared touch screen; When the quantity obtaining touch point is greater than one, parallel scan is carried out to described infrared touch screen.
Wherein in an embodiment, after the described serial scan to preset time, then carry out parallel scan, obtain the quantity of touch point, and according to the quantity of described touch point, select corresponding scan pattern.
Wherein in an embodiment, when the quantity of described acquisition touch point is greater than one, described infrared touch screen is carried out in the step of parallel scan, if in certain parallel scan, when the quantity of acquisition touch point is one, immediately serial scan is carried out to described touch screen.
Wherein in an embodiment, described parallel scan comprises one-to-many scanning, i.e. the Infrared of an infrared emission tube transmitting can be received by multiple infrared receiver tube.
A kind of infrared touch screen, it comprises: substrate; Infrared transmitting tube, is arranged on the periphery of described substrate, in order to launch Infrared; Infrared receiving tube, is arranged on the periphery of described substrate, in order to receive the Infrared that described infrared transmitting tube is launched; Control module, is connected with described infrared transmitting tube and described infrared receiving tube, in order to infrared transmitting tube described in gating and described infrared receiving tube; Described control module, with infrared transmitting tube and infrared receiving tube described in parallel scan mode gating, obtains the quantity of touch point; Described control module, according to the quantity of touch point, selects scan pattern; Described control module is touch point according to the transmitting and receiving Signal analysis of described infrared transmitting tube and infrared receiving tube.
Wherein in an embodiment, when the quantity obtaining touch point is one, described control module selects serial scan pattern; When sentencing the quantity obtaining touch point and being greater than one, described control module selects parallel scan pattern.
Wherein in an embodiment, after described control module selects serial scan pattern, after presetting secondary described serial scan, then control module selects parallel scan pattern, obtain the quantity of touch point, and according to the quantity of described touch point, select corresponding scan pattern.
Wherein in an embodiment, when sentencing the quantity obtaining touch point and being greater than one, described control module selects parallel scan pattern, if in certain parallel scan, when the quantity of acquisition touch point is one, control module selects serial scan pattern immediately.
Wherein in an embodiment, described parallel scan comprises one-to-many scanning, i.e. the Infrared of an infrared emission tube transmitting can be received by multiple infrared receiver tube.
Above-mentioned infrared touch screen and scan method thereof, first judge the quantity of touch point, select scan pattern to identify touch point according to the quantity of touch point, so no matter the quantity of touch point is how many times, can obtain higher frame per second during scanning, result of use promotes greatly.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the infrared touch screen scan method in present embodiment;
Fig. 2 is for the process flow diagram of the scan method of 70 cun of infrared touch screens;
Fig. 3 is the structural representation of the infrared touch screen in present embodiment.
Embodiment
The present invention discloses a kind of infrared touch screen scan method, please refer to Fig. 1, the method comprises the following steps:
S110: carry out parallel scan to infrared touch screen, obtains the quantity of touch point.Concrete, the substrate of infrared touch screen is generally rectangle or square, relatively respectively in substrate periphery be provided with infrared transmitting tube and infrared receiving tube, the infrared ray that infrared transmitting tube is launched can be received by infrared receiving tube, when substrate existing touch point, this touch point can cover the infrared ray that corresponding infrared transmitting tube is launched, and causes corresponding infrared receiving tube not receive this infrared ray, thus judges the existence having touch point.Parallel scan in this step is that simultaneously the multiple infrared transmitting tube of gating and infrared receiving tube or whole infrared transmitting tubes and infrared receiving tube detect the touch point on substrate, and judges the quantity of touch point.It will be appreciated by persons skilled in the art that the frame per second of parallel scan can set according to the actual conditions such as size of substrate, accuracy of identification.
S130: according to the quantity of touch point, selects scan pattern.Concrete, this step can select corresponding scan pattern according to the quantity of the touch point obtained in step S110, with the quantity making the scan pattern selected adapt to touch point.
In the present embodiment, when the quantity judging touch point is one, serial scan is carried out to touch screen, i.e. gating infrared transmitting tube successively and corresponding infrared receiving tube, in the enterprising line scanning of the both direction of substrate, the quantity due to touch point is one, thus without the need to removing pseudo-point tiltedly sweeping, the frame per second scanned can be kept like this to be in higher level, accurate judgement can be obtained again.
When judging that the quantity of described touch point is greater than one, continue to keep parallel scan to touch screen.Described parallel scan comprises one-to-many scanning, and the Infrared that namely infrared emission tube is launched can be received by multiple infrared receiver tube, and the infrared ray received according to infrared receiving tube determines the position of touch point.In the present embodiment, when carrying out parallel scan, if when the quantity of the touch point obtained is one, can serial scan be selected.
Certainly, in some cases, when carrying out serial scan to touch screen, can the quantity of touch point can increase for some reason, thus be greater than one, therefore, in the present embodiment, after presetting secondary serial scan, then parallel scan can be carried out, obtain the quantity of touch point, and according to the quantity of touch point, select corresponding scan pattern.At this, can be the same with described above, when the quantity of acquisition touch point is one, continue to select serial scan, when the quantity of the touch point obtained is more than one, can parallel scan be selected.
Certainly, the quantity of touch point and the selection of scan pattern are not limited to above method, when the quantity of touch point is less, during as one, two, three etc., still can utilize serial scan, as long as ensure the reduction that scanning frame per second can not be larger in a word.
S150: identify touch point.Concrete scan according to the scan pattern in step S130 the structure obtained and identify touch point, determine the position of touch point.
Due to, when the touch point of serial scan to lesser amt scans, there is higher scanning frame per second; And parallel scan is when scanning the touch point of lesser amt, its scanning frame per second is starkly lower than serial scan, and when the touch point for a greater number scans, compares have advantage with serial scan.Said method scans infrared touch screen by selecting different scan modes, and no matter the quantity of touch point is mostly few, still scanning frame per second can be remained on certain level, improve result of use.
Now, object lesson illustrates method described above.At this, just to describing conveniently, setting infrared touch screen and being of a size of 70 cun, parallel scan required time is 10ms, serial scan required time is 2ms, and in order to find more touch point accurately, needs once parallel scan at least every 50ms.Certainly, it will be appreciated by persons skilled in the art that the size of infrared touch screen and parallel scan, the time of serial scan can arrange according to actual conditions.Scanning for this infrared touch screen comprises the following steps:
S210: start to carry out parallel scan to infrared touch screen, obtains the quantity of touch point.It is 10ms that this step scans the time spent, and frame per second is now 100 frames/second.
S220: whether the quantity of the touch point obtained in determining step S210 is greater than one.If the quantity of the touch point obtained is greater than one, when namely the quantity of touch point is two or more, then repeat step S210.If when the quantity of the touch point obtained is one, continue to perform S230.
S230: carry out serial scan, because need once parallel scan at least every 50ms, so in ensuing 40ms, all carries out serial scan.In this step, the time of serial scan is 2ms, therefore in 40ms, can carry out 20 serial scans, frame per second now can reach 500 frames/second.
Because need once parallel scan at least every 50ms, so after S230, then repeat step S210.
As can be seen here, when infrared touch screen only having a touch point, then the average frame per second of this scan method is 1000/ [50ms/ (20 times+1 time)]=420 frames/second, and this obviously improves a lot than the frame per second of parallel scan 100 frames/second; When infrared touch screen having more than one touch point, average frame per second is 1000/ (10ms/ time)=100 frames/second, and time now for serial scan, touch point is that the words frame per second of 5 will be reduced to 40 frames/second, so when touch point is more, frame per second also has very high lifting.
The present invention also discloses a kind of infrared touch screen, please refer to Fig. 3, and this infrared touch screen 100 comprises substrate 120, infrared transmitting tube 110, infrared receiving tube 130 and control module 140.Substrate 120 is generally rectangle or square, relatively respectively in substrate periphery be provided with infrared transmitting tube 110 and infrared receiving tube 130, the infrared ray that infrared transmitting tube 110 is launched can be received by infrared receiving tube 130, when there is touch point in substrate 120, this touch point can cover the infrared ray that corresponding infrared transmitting tube 110 is launched, cause corresponding infrared receiving tube 130 not receive this infrared ray, thus judge the existence having touch point.
Control module 140 is connected with infrared transmitting tube 110 and infrared receiving tube 130, in order to gating infrared transmitting tube 110 and infrared receiving tube 130.Control module 140, with parallel scan mode gating infrared transmitting tube 110 and infrared receiving tube 130, obtains the quantity of touch point.Parallel scan is that the multiple infrared transmitting tube of gating 110 and infrared receiving tube 130 or whole infrared transmitting tubes 110 and infrared receiving tube 130 detect the touch point on substrate 120, and obtains the quantity of touch point.It will be appreciated by persons skilled in the art that the frame per second of parallel scan can set according to actual conditions such as substrate 120 size, accuracy of identification.
Control module 140, according to the quantity of touch point, selects scan pattern to come gating infrared transmitting tube 110 and infrared receiving tube 130.In the present embodiment, when the quantity obtaining touch point is one, control module 140 selects serial scan pattern; When the quantity obtaining touch point is greater than one, control module 140 selects parallel scan pattern.Serial scan is carried out to infrared touch screen, i.e. control module 140 gating infrared transmitting tube 110 successively and corresponding infrared receiving tube 130, in the enterprising line scanning of the both direction of substrate 120, quantity due to touch point is one, thus without the need to removing pseudo-point tiltedly sweeping, the frame per second scanned can be kept like this to be in higher level, the accurate position obtaining touch point can be obtained again.
When the quantity obtaining touch point is greater than one, continue to keep parallel scan to infrared touch screen.In the present embodiment, parallel scan can take the scan mode of one-to-many, an i.e. corresponding multiple infrared receiving tube 130 of infrared transmitting tube 110, gating infrared transmitting tube 110 and corresponding multiple infrared receiving tubes 130, the infrared ray that infrared transmitting tube 110 is launched is received by multiple infrared receiving tube 130, and the infrared ray received according to infrared receiving tube 130 determines the position of touch point.In the present embodiment, when certain parallel scan, if when the quantity of the touch point obtained is one, when carrying out scanning next time, control module 140 can select serial scan pattern.
In some cases, when carrying out serial scan to substrate 120, on substrate 120, the quantity of touch point can increase for some reason, thus is greater than one, therefore, in the present embodiment, then control module 140 can be selected parallel scan pattern, obtain the quantity of touch point after have selected and presetting secondary serial scan pattern, and according to the quantity of touch point, select corresponding scan pattern.At this, can be the same with described above, when the quantity of acquisition touch point is one, continue to select serial scan, when the quantity of the touch point obtained is more than one, can parallel scan be selected.
Certainly, the quantity of touch point and the selection of scan pattern are not limited to above method, when the quantity of touch point is less, during as one, two, three etc., still can utilize serial scan, as long as ensure the reduction that scanning frame per second can not be larger in a word.
Control module 140 can according to the transmitting and receiving Signal analysis of infrared transmitting tube 110 and infrared receiving tube 130 touch point, and generate corresponding operation, thus realize the touch control operation of infrared touch screen.
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this instructions is recorded.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. an infrared touch screen scan method, in order to the scanning to infrared touch screen, is characterized in that, comprises the following steps:
Parallel scan is carried out to described infrared touch screen, obtains the quantity of touch point;
According to the quantity of touch point, select scan pattern;
Identify touch point.
2. infrared touch screen scan method according to claim 1, is characterized in that, according to the quantity of described touch point, selects the step of scan pattern to comprise:
When the quantity obtaining touch point is one, serial scan is carried out to described infrared touch screen;
When the quantity obtaining touch point is greater than one, parallel scan is carried out to described infrared touch screen.
3. infrared touch screen scan method according to claim 2, is characterized in that, after the described serial scan to preset time, then carries out parallel scan, obtains the quantity of touch point, and according to the quantity of described touch point, selects corresponding scan pattern.
4. infrared touch screen scan method according to claim 2, it is characterized in that, when the quantity of described acquisition touch point is greater than one, carry out in the step of parallel scan to described infrared touch screen, if in certain parallel scan, when the quantity of acquisition touch point is one, immediately serial scan is carried out to described touch screen.
5. infrared touch screen scan method according to claim 2, is characterized in that, described parallel scan comprises one-to-many scanning, i.e. the Infrared of an infrared emission tube transmitting can be received by multiple infrared receiver tube.
6. an infrared touch screen, comprising:
Substrate;
Infrared transmitting tube, is arranged on the periphery of described substrate, in order to launch Infrared;
Infrared receiving tube, is arranged on the periphery of described substrate, in order to receive the Infrared that described infrared transmitting tube is launched;
Control module, is connected with described infrared transmitting tube and described infrared receiving tube, in order to infrared transmitting tube described in gating and described infrared receiving tube;
It is characterized in that, described control module, with infrared transmitting tube and infrared receiving tube described in parallel scan mode gating, obtains the quantity of touch point;
Described control module, according to the quantity of touch point, selects scan pattern;
Described control module is touch point according to the transmitting and receiving Signal analysis of described infrared transmitting tube and infrared receiving tube.
7. infrared touch screen according to claim 6, is characterized in that,
When the quantity obtaining touch point is one, described control module selects serial scan pattern;
When sentencing the quantity obtaining touch point and being greater than one, described control module selects parallel scan pattern.
8. infrared touch screen according to claim 7, it is characterized in that, after described control module selects serial scan pattern, after presetting secondary described serial scan, then control module selects parallel scan pattern, obtain the quantity of touch point, and according to the quantity of described touch point, select corresponding scan pattern.
9. infrared touch screen according to claim 6, is characterized in that, when sentencing the quantity obtaining touch point and being greater than one, described control module selects parallel scan pattern, if in certain parallel scan, when the quantity of acquisition touch point is one, control module selects serial scan pattern immediately.
10. infrared touch screen according to claim 7, is characterized in that, described parallel scan comprises one-to-many scanning, i.e. the Infrared of an infrared emission tube transmitting can be received by multiple infrared receiver tube.
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| CN108021290A (en) * | 2016-10-31 | 2018-05-11 | 深圳市鸿合创新信息技术有限责任公司 | A kind of infrared touch-control scan method |
| US11907474B2 (en) | 2020-12-21 | 2024-02-20 | Anhui Hongcheng Opto-Electronics Co., Ltd. | Infrared touch scanning method, apparatus and storage medium |
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| US11907474B2 (en) | 2020-12-21 | 2024-02-20 | Anhui Hongcheng Opto-Electronics Co., Ltd. | Infrared touch scanning method, apparatus and storage medium |
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| CN105094463B (en) | 2018-09-25 |
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