CN102346601A - Multi-touch display screen device - Google Patents
Multi-touch display screen device Download PDFInfo
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- CN102346601A CN102346601A CN2011101825277A CN201110182527A CN102346601A CN 102346601 A CN102346601 A CN 102346601A CN 2011101825277 A CN2011101825277 A CN 2011101825277A CN 201110182527 A CN201110182527 A CN 201110182527A CN 102346601 A CN102346601 A CN 102346601A
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- infrared laser
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Abstract
The invention discloses a multi-touch display screen device which comprises at least two linear infrared laser light sources, infrared receiving modules, an infrared camera and a master control module, wherein the linear infrared laser light sources are arranged at the corners of the touch display screen, the infrared receiving modules are respectively arranged at each edge of the touch display screen, and the infrared camera and the master control module are arranged on the back side of the touch display screen; the master control module is respectively connected with the infrared receiving modules, the linear infrared laser light sources and the infrared camera, and controls the operation of them; each linear infrared laser light source emits infrared laser in turn; the infrared camera shoots an image of the whole touch display screen and acquires a range of touch points; the infrared receiving modules receive the infrared laser and acquire information of shielding lines; the master control module reads the information of the shielding lines and calculating the coordinates of intersection points of the shielding lines, and according to the range of touch points and the coordinates of intersection points of the shielding lines, judges the coordinate of a touch point. By using the device disclosed by the invention, a multi-touch operation can be performed effectively, and in the process of touch positioning by adopting a camera shooting mode alone, a phenomenon of erroneous judgment caused by that a distance between the touch points is small can be avoided.
Description
Technical field
The present invention relates to the touch display screen technology, particularly a kind of multiple point touching display device.
Background technology
The electronic touch technology provides great convenience to man-machine interaction mode, technical multiple solution is provided also, and Performance And Reliability is also constantly perfect.The touching device that occurs an a kind of infrared word LASER Light Source in the market; Can really realize multiple point touching with it; And can realize that zero pressure touches and is well received by the public; Like the patent No. is that disclosed infrared hyphen laser multi-touch screen device of CN101770314A and touch localization method form one deck infrared ray plane by an infrared word laser instrument in touch screen surface; When objects such as finger are pressed close to touch-screen; Infrared ray on the infrared ray plane is reflected; Form bright spot; Infrared camera captures these bright spots; And picture passed to computer; Computer carries out Treatment Analysis, identifies the touch point.But when adjacent two or more touch points are leaned on closerly; Because there is diversity in the bright spot of the infrared that camera photographs; Can cause these touch points are used as is a touch point; Thereby cause erroneous judgement; In many people operating process simultaneously, the degree of accuracy of touch recognition is lower especially.
Summary of the invention
In order to address the above problem, the present invention provides a kind of multiple point touching display device.
A kind of multiple point touching display device comprises:
At least two word line infrared laser light sources that are installed in the touch display screen corner, be installed in infrared receiving module, the infrared camera that is installed in the touch display screen back side and main control module on each bar limit of touch display screen;
Said main control module connects said infrared receiving module, word line infrared laser light source and infrared camera respectively, and controls the operation of said infrared receiving module, word line infrared laser light source and infrared camera;
The said word line infrared laser light source of said master control module controls is launched infrared laser in turn;
The said infrared camera of said master control module controls is taken the image of whole touch display screen, and according to the scope of said image calculation touch point;
Said infrared receiving module receives said infrared laser, and obtains the line information of blocking on the touch display screen according to the intensity level of said infrared laser;
Said main control module read said block line information and calculate block the line intersecting point coordinate, judge the touch point coordinate according to this scope of blocking line intersecting point coordinate and said touch point then.
Compared with prior art; Touching technique of the present invention is through the comprehensive mode that adopts shooting and infrared scan; Utilize shooting to obtain the image of touch display screen in real time; Can carry out the multiple point touching display screen effectively; Can many people operate simultaneously; Simultaneously; In carrying out the operation of multiple point touching display screen; The touch point scope of obtaining according to shooting is in conjunction with the characteristic of infrared scan net height resolution, the coordinate of each touch point of accurate Calculation; Avoided independent employing shooting mode to touch in the position fixing process; At a distance of the nearer and phenomenon erroneous judgement that produces, improve the degree of accuracy of touch recognition because the touch point, realized high-resolution touch location.
Description of drawings
Fig. 1 is the structural representation of the multiple point touching display device in the present embodiment;
Fig. 2 is the schematic flow sheet of a kind of localization method among the embodiment;
Fig. 3 to Fig. 5 is the exemplary plot of the application example among the embodiment.
Embodiment
Below in conjunction with accompanying drawing and embodiment technology of the present invention is described in detail.
Referring to Fig. 1; Fig. 1 is the structural representation of the multiple point touching display device in the present embodiment; Comprise: the word line infrared laser light source 103,104 that is installed in the corner, two ends on touch display screen 101 one side; Be installed in the infrared receiving module 102 on touch display screen 101 its excess-three limits, be installed in the infrared camera 105 and the main control module 106 at the touch display screen back side.
Wherein, main control module 106 and infrared receiving module 102, word line infrared laser light source 103,104, infrared camera 105 is connected, and controls infrared receiving module 102, word line infrared laser light source 103,104, the operation of infrared camera 105.
The infrared camera 105 that is installed in the touch display screen back side can photograph the image of whole touch display screen 101.
For the word line infrared laser light source, can at least two word line infrared laser light sources be installed in the different corners of touch display screen.Preferably, present embodiment adopts two word line infrared laser light sources, on one side be installed in the corner location that touch display screen is gone up two ends respectively.
As shown in Figure 1; Word line infrared laser light source 103,104 is installed in the corner location that touch display screen is gone up two ends on one side; Infrared receiving module 102 is installed on other three limits of touch display screen; Wherein, Infrared receiving module 102 comprises the infrared receiving tube array; Like a among Fig. 1, b, c three limits, be distributed in the a+1 to a+n on a limit, the b+1 to b+n on b limit, c+1 to the c+n infrared receiving tube on c limit.
For each word line infrared laser light source; The infrared light of its emission can cover the plane of whole touch display screen 101; And corresponding infrared receiving tube in all corresponding infrared receiving module 102 of each word line infrared laser light source; For example; Word line infrared laser light source 103 corresponding at the infrared receiving tube a+k1 of infrared receiving module 102 to c+n; Word line infrared laser light source 104 corresponding at the infrared receiving tube a of infrared receiving module 102 to c+k2; Each word line infrared laser light source is to launch infrared laser in turn, and promptly there is and has only a word line infrared laser light source any time at the emission infrared laser.
In practical work process; During word line infrared laser light source 103 emission infrared lasers; The infrared laser that infrared receiving module 102 scanning a+k1 receive to the c+n infrared receiving tube; During word line infrared laser light source 104 emission infrared lasers, the infrared laser that infrared receiving module 102 scanning a receive to the c+k2 infrared receiving tube.
Referring to Fig. 2, Fig. 2 is a kind of schematic flow sheet of the localization method based on multiple point touching display device of the present invention.
Under the control of main control module 106; Two word line infrared laser light sources 103,104 are launched infrared laser in turn; Simultaneously, infrared camera 105 is taken the image that obtains touch display screen 101, and main control module 106 is according to the scope of said image calculation touch point.
Simultaneously, under the control of main control module 106, the infrared laser that the infrared receiving tube reception word line infrared laser light source corresponding with it in the infrared receiving module 102 launched obtains the line information of blocking on the touch display screen 101.
Take whole touch display screen 101 images for infrared camera 105; Preferably; Be under the no touch state at touch display screen 101; The background image that main control module 106 control infrared cameras 105 are taken whole touch display screen 101 promptly carries out initialization to the infrared camera under the no touch state 105; Be under the normal operating conditions at touch display screen 101, main control module 106 control infrared cameras 105 are taken the realtime graphic of whole touch display screen 101 with frequency preset.
In shooting process; When touch display screen 101 is placed with the touch object; The casual back side that can be reflected to touch display screen 101 of the part infrared laser on the formed infrared laser of the infrared laser plane of word line infrared laser light source 103,104 emissions, infrared camera 105 just can photograph the image of bright spot.
Main control module 106 reads said background image and realtime graphic, and can calculate the scope of touch point according to said background image and realtime graphic.
For the scope of calculating the touch point, preferably, said background image and realtime graphic are obtained doing difference figure as difference operation, then this work difference figure is carried out binary conversion treatment;
Particularly, after making difference operation, preset gray scale threshold values, the plain gray-scale value of difference image is made in judgement; If exist gray-scale value to surpass the pixel of said gray scale threshold values, the scope of then judging this pixel is the touch point scope;
Further, the pixel (being the pixel of touch point scope) that gray-scale value is surpassed said gray scale threshold values is set to white, and the pixel (being the pixel of non-touch point scope) that simultaneously gray-scale value is no more than said gray scale threshold values is set to black.
For example, setting gray threshold is 210, then will make the gray-scale value of difference in scheming and be made as white greater than 210 pixel, gray-scale value is less than or equal to 210 pixel and is made as black.
If do not exist gray-scale value to surpass the pixel of this gray scale threshold values among the difference figure, the current touch operation that do not exist then is described, continue to handle next realtime graphic.
Process for infrared receiving module 102 reception infrared lasers; Preferably; Be under the no touch state at touch display screen 101; Main control module 106 control infrared receiving modules 102 receive the initial strength value that infrared laser obtains infrared laser, promptly the infrared receiving module under the no touch state 102 are carried out initialization; Be under the normal operating conditions at touch display screen 101, main control module 106 control infrared receiving modules 102 receive the Real-time intensity value that infrared laser obtains infrared laser.
Obtain the method for blocking line information of touch display screen 101 for infrared receiving module 102, preferably, the initial value that preset infrared laser intensity threshold values, judgement infrared receiving tube receive infrared laser deducts the difference of real time data; If said difference is greater than said intensity threshold values; Illustrate and exist infrared laser to be blocked; Obtain according to the position line of this infrared receiving tube and corresponding word line infrared laser light source thereof and to block line, each bar blocks line and forms the intersection point that blocks line in the intersection, and these intersection points have comprised the touch point.
Main control module 106 calculate block the line intersecting point coordinate after, can judge the touch point coordinate according to this intersecting point coordinate and the above-mentioned scope that obtains the touch point.
For the method for judging, particularly, if the said line intersecting point coordinate that blocks in said white pixel scope, judges that then this intersecting point coordinate is the touch point coordinate; If the said line intersecting point coordinate that blocks in said black picture element scope, judges that then this intersecting point coordinate is a non-touch point coordinate.
Referring to Fig. 3 to Fig. 5, Fig. 3 to Fig. 5 is the exemplary plot according to an application example of present embodiment generation.
As shown in Figure 3, when the touch point was distance two touch point Q1 far away, Q2, through the mode of shooting, the work difference figure that the process processing obtains after the binaryzation can tell two touch points clearly.
As shown in Figure 4; When the touch point is two touch point Q3, the Q4 of close together; Because there is diversity in the bright spot of the infrared laser that camera head photographs emission; Touch point Q3, the Q4 situation in zone, same touch point will appear in the work difference figure after the binaryzation; At this moment; Directly judging according to making difference figure, can be a touch point with Q3, Q4 erroneous judgement.
At this moment; Utilize the high characteristics of resolution of infrared scan net; Can effectively identify the touch point Q3 of close together; Q4; As shown in Figure 5; The information of supposing to block line is L1; L2; L3; L4; The intersection point that then blocks line formation is Q3; Q4; Q5; Q6; Correspondingly; The intersecting point coordinate that blocks line is Q3; Q4; Q5; The coordinate of Q6 can be confirmed the coordinate of touch point according to above-mentioned work difference figure and intersecting point coordinate, as shown in Figure 5; Intersection point Q3; Q4 is in the white pixel scope of making difference figure; So judge Q3; Q4 is the touch point, and this blocks line intersecting point coordinate Q3 (x3; Y3), Q4 (x4; Y4) be the coordinate of touch point; And intersection point Q5, Q6 are in the black picture element scope of making difference figure, so judge that Q5, Q6 are non-touch point.
Above-described embodiment of the present invention does not constitute the qualification to protection domain of the present invention.Any modification of within spirit of the present invention and principle, being done, be equal to replacement and improvement etc., all should be included within the claim protection domain of the present invention.
Claims (10)
1. a multiple point touching display device is characterized in that, comprising:
At least two word line infrared laser light sources that are installed in the touch display screen corner, be installed in infrared receiving module, the infrared camera that is installed in the touch display screen back side and main control module on each bar limit of touch display screen;
Said main control module connects said infrared receiving module, word line infrared laser light source and infrared camera respectively, and controls the operation of said infrared receiving module, word line infrared laser light source and infrared camera;
The said word line infrared laser light source of said master control module controls is launched infrared laser in turn;
The said infrared camera of said master control module controls is taken the image of whole touch display screen, and according to the scope of said image calculation touch point;
Said infrared receiving module receives said infrared laser, and obtains the line information of blocking on the touch display screen according to the intensity level of said infrared laser;
Said main control module read said block line information and calculate block the line intersecting point coordinate, judge the touch point coordinate according to this scope of blocking line intersecting point coordinate and said touch point then.
2. device according to claim 1; It is characterized in that; The quantity of said word line infrared laser light source is two, is installed in the corner at two ends on limit of said touch display screen respectively, and said infrared receiving module is installed in respectively on other three limits of said touch display screen.
3. device according to claim 2 is characterized in that, when said word line infrared laser light source was launched infrared laser, the infrared receiving tube of its correspondence in said infrared receiving module read the intensity level of the said infrared laser that receives.
4. device according to claim 1 is characterized in that, the image that the said infrared camera of said master control module controls is taken whole touch display screen comprises:
Be under the no touch state at touch display screen, the said infrared camera of said master control module controls is taken the background image of whole touch display screen;
Under touch display screen was in normal operating conditions, the said infrared camera of said master control module controls was taken the realtime graphic of whole touch display screen with frequency preset.
5. device according to claim 4 is characterized in that, said scope according to said image calculation touch point comprises: said background image and realtime graphic are obtained doing difference figure as difference operation, and judge the scope of touch point according to said work difference figure.
6. device according to claim 5 is characterized in that, saidly judges that according to said work difference figure the step of the scope of touch point comprises:
Preset gray scale threshold values is adjudicated the said plain gray-scale value of difference image of doing; If exist gray-scale value to surpass the pixel of said gray scale threshold values, the scope of then judging this pixel is the touch point scope.
7. device according to claim 6 is characterized in that, saidly judges that according to said work difference figure the step of the scope of touch point further comprises:
The pixel that gray-scale value surpasses said gray scale threshold values is set to white, and the gray-scale value pixel that is no more than said gray scale threshold values is set to black simultaneously.
8. device according to claim 1 is characterized in that, said infrared receiving module receives said infrared laser and comprises:
Be under the no touch state at touch display screen, said infrared receiving module reads the said infrared laser that receives and obtains the initial strength value;
Under touch display screen was in normal operating conditions, said infrared receiving module read the said infrared laser that receives and obtains the Real-time intensity value.
9. device according to claim 8 is characterized in that, the line information of blocking that said intensity level according to said infrared laser obtains on the touch display screen comprises step:
According to preset infrared laser intensity threshold values, the initial strength value of adjudicating said infrared receiving tube reception infrared laser deducts the difference of Real-time intensity value;
If said difference greater than said intensity threshold values, is blocked line information according to the position line acquisition of infrared receiving tube that receives this receipts infrared laser in the infrared receiving module and the corresponding word line infrared laser light source of launching.
10. device according to claim 9 is characterized in that, this scope of blocking line intersecting point coordinate and said touch point of said basis is judged the touch point coordinate and comprised step:
If the said line intersecting point coordinate that blocks in said white pixel scope, judges that then this intersecting point coordinate is the touch point coordinate;
If the said line intersecting point coordinate that blocks in said black picture element scope, judges that then this intersecting point coordinate is a non-touch point coordinate.
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| CN2011101825277A CN102346601A (en) | 2011-07-01 | 2011-07-01 | Multi-touch display screen device |
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| CN2011101825277A CN102346601A (en) | 2011-07-01 | 2011-07-01 | Multi-touch display screen device |
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| CN103123553A (en) * | 2012-10-16 | 2013-05-29 | 深圳市骄阳数字图像技术有限责任公司 | Multi-touch point image identification interactive system |
| CN104777927A (en) * | 2014-01-15 | 2015-07-15 | 纬创资通股份有限公司 | Image type touch control device and control method thereof |
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| CN101571775A (en) * | 2009-06-04 | 2009-11-04 | 广东威创视讯科技股份有限公司 | Method and device for detecting image touch points |
| CN102004586A (en) * | 2010-11-23 | 2011-04-06 | 广东威创视讯科技股份有限公司 | Touch point positioning device and method |
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| US20080259053A1 (en) * | 2007-04-11 | 2008-10-23 | John Newton | Touch Screen System with Hover and Click Input Methods |
| CN101145091A (en) * | 2007-11-01 | 2008-03-19 | 复旦大学 | Touch panel based on infrared pick-up and its positioning detection method |
| CN101571775A (en) * | 2009-06-04 | 2009-11-04 | 广东威创视讯科技股份有限公司 | Method and device for detecting image touch points |
| CN102033640A (en) * | 2009-09-30 | 2011-04-27 | 北京汇冠新技术股份有限公司 | Touch system and multi-point positioning method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104777927A (en) * | 2014-01-15 | 2015-07-15 | 纬创资通股份有限公司 | Image type touch control device and control method thereof |
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Application publication date: 20120208 |