CN105549796A - Touch screen and touch positioning method - Google Patents
Touch screen and touch positioning method Download PDFInfo
- Publication number
- CN105549796A CN105549796A CN201510938162.4A CN201510938162A CN105549796A CN 105549796 A CN105549796 A CN 105549796A CN 201510938162 A CN201510938162 A CN 201510938162A CN 105549796 A CN105549796 A CN 105549796A
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- CN
- China
- Prior art keywords
- touch
- receiving device
- infrared
- infrared receiving
- screen body
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
- G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
- G06F3/0423—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen using sweeping light beams, e.g. using rotating or vibrating mirror
Abstract
The invention discloses a touch screen, which comprises a touch screen body, wherein two adjacent edges of the touch screen body are provided with infrared emission devices; the other two adjacent edges of the touch screen body are provided with first infrared receiving device; the touch screen body is provided with second infrared receiving devices; and the second infrared receiving devices and the infrared emission devices are arranged on the edges of the touch screen body and are arranged at intervals. The touch screen has the advantages that the position of a touch point can be more accurately obtained.
Description
Technical field
The present invention relates to touch-screen field, particularly relate to infrared touch panel field.
Background technology
Touch system, as a kind of man-machine interactive input equipment, because it is simple to operate, uses the feature such as flexible to be widely used.Touching technique develops into today, and the technology of several main flow is ripe gradually, and infrared touch is exactly wherein a kind of.
Infrared touch panel because of easy to use, anti-knock properties are strong, transmittance is high, high reliability and be widely used in every field gradually.Through the development of more than 20 years, single-point Infrared touch screen technology reached its maturity.But the precision of general touch-screen location is not high.Traditional infrared touch-screen adopts the mode of vertical scanning, judges touch location, and the precision of this algorithm relies on the spacing between adjacent lamps, still there is the problem that precision is not high.
Summary of the invention
Technical matters to be solved by this invention realizes a kind ofly touching the high touch-screen of precision and touch localization method.
To achieve these goals, the technical solution used in the present invention is: a kind of touch-screen, comprise touch screen body, described touch screen body two adjacent edge is provided with infrared launcher, other two adjacent edges of described touch screen body are provided with the first infrared receiving device, described touch screen body is provided with the second infrared receiving device, and described second infrared receiving device and infrared launcher are provided with edge in touch screen body and interval is arranged.
Distance between described second infrared receiving device and touch screen body edge is less than the distance between infrared launcher and touch screen body edge.
Distance between described first infrared receiving device and touch screen body edge is less than the distance between infrared launcher and touch screen body edge.
The microcontroller that touch-screen is provided with and controls infrared launcher, the first infrared receiving device, the second infrared receiving device switch voltage AD value after reading opto-electronic conversion carry out touch point judgement.
Localization method based on described touch-screen:
Step 1, driving infrared receiving device and infrared launcher, record the voltage AD value after often pair of infrared receiving device and infrared launcher opto-electronic conversion;
Step 2, the touch point number possible with the AD value multilevel iudge of setting according to the AD value of record, if do not touched, return step 1, scan next time; If there is touch point, then jump to step 3;
Step 3, according to record AD value, judge that first scanning that is tilted to the left is in the light road D1, judge that last is tilted to the right and scan the road D2 that is in the light, judge that first scanning that is inclined upwardly is in the light road D3, judge that last downward-sloping scanning is in the light road D4, determine touch objects four limit edge line D1, D2, D3, D4, calculate the average coordinates M of four intersection points A, B, C, D of four limit edge line D1, D2, D3, D4, coordinate M is the location of touch point;
Step 4, return step 1.
In described step 1, infrared receiving device and infrared launcher circulate successively according to putting in order and are driven.
In described step 3, after determining four edges boundary line D1, D2, D3, D4, their equations are set up to be: D1 is y=k
1x+b
1, D2 is y=k
2x+b
2, D3 is y=k
3x+b
3, D4 is y=k
4x+b
4, the parameter k of equation
1, b
1, k
2, b
2, k
3, b
3, k
4, b
4it is the given value obtained according to coordinate; D1 and D3 has intersection point, and intersection point A coordinate is
d2 and D3 has intersection point, and intersection points B coordinate is
d2 and D4 has intersection point, and intersection point C coordinate is
d1 and D4 has intersection point, and intersection point D coordinate is
then M is
The invention has the advantages that the position that can obtain touch point more accurately.
Accompanying drawing explanation
Below the content that width accompanying drawing every in instructions of the present invention is expressed is briefly described:
Fig. 1 is infrared scan mode schematic diagram;
Fig. 2 is for setting up coordinate schematic diagram;
Fig. 3 is touch localization method schematic diagram.
Embodiment
As shown in Figure 1, touch-screen comprises touch screen body, and touch screen body two adjacent edge is provided with infrared launcher, and infrared launcher is provided with multiple, and is equidistantly fixed on touch screen body edge; Other two adjacent edges of touch screen body are provided with the first infrared receiving device, and the first infrared receiving device is provided with multiple, and is equidistantly fixed on touch screen body edge; Touch screen body is also provided with multiple second infrared receiving device, and the second infrared receiving device and infrared launcher homonymy are arranged, and the second infrared receiving device and infrared launcher interval are arranged.Received the infrared signal of touch objects reflection by the second infrared receiving device, improve the accuracy that touch-screen judges touch point.
In order to improve the accuracy that touch-screen judges touch point further, distance between the second infrared receiving device and touch screen body edge is less than the distance between infrared launcher and touch screen body edge, namely the second infrared receiving device is more close to the edge of fixation side touch screen body, distance between the first same infrared receiving device and touch screen body edge is less than the distance between infrared launcher and touch screen body edge, and the position of such first infrared receiving device is more near touch screen body edge.Can only accept by such structure second infrared receiving device the infrared light that touch objects reflects, the infrared light that infrared launcher is launched then is received by the first infrared receiving device.
Touch-screen is by microprocessor controls, and the switch of microprocessor controls infrared launcher, the first infrared receiving device, the second infrared receiving device, reads the voltage AD value after each device opto-electronic conversion, then carry out touch point judgement.
Concrete determining step is as follows:
Step 1, microcontroller start infrared touch panel, drive 1.2.3 in order, ...., N infrared receiving device and first, second infrared launcher, record the voltage AD value after often pair of infrared receiving device and the first infrared launcher, the second infrared launcher opto-electronic conversion, jump to step 2;
Step 2, microcontroller are according to the AD value of record, and the touch point number that the AD value multilevel iudge set with is possible, if do not touched, returns steps A, scan next time; If there is (or multiple) touch objects, then jump to step 3;
Step 3, microcontroller are according to the AD value of record, judge that first scanning that is tilted to the left is in the light road D1, judge that last is tilted to the right and scan the road D2 that is in the light, judge that first scanning that is inclined upwardly is in the light road D3, judge that last downward-sloping scanning is in the light road D4, determine touch objects four limit edge line D1, D2, D3, D4 (as Fig. 2), according to four lines, calculate four intersection points A, B, C, D, the average M of coordinate of 4
the coordinate calculated is returned, realizes the location of touch point;
Step 4, return steps A continue next week scanning.
Shown in Figure 2, touch positioning identifying method of the present invention, comprises step:
Set up coordinate system, determine four edges boundary line D1, D2, D3, D4, set up their equations to be: D1 is y=k
1x+b
1, D2 is y=k
2x+b
2, D3 is y=k
3x+b
3, D4 is y=k
4x+b
4, because these equations are all choose in advance, so the equation of these straight lines is also determine in advance.The parameter k of all equations
1, b
1, k
2, b
2, k
3, b
3, k
4, b
4it is all given value.
D1 and D3 has intersection point, and intersection point A coordinate is
d2 and D3 has intersection point, and intersection points B coordinate is
d2 and D4 has intersection point, and intersection point C coordinate is
d1 and D4 has intersection point, and intersection point D coordinate is
Finally obtain the average coordinates of A, B, C, D 4.
As shown in Figure 3, point A, B, C, D are the intersection point of four straight lines, point N is the coordinate position determined according to vertical scanning method, point O is the true coordinate of touch objects, point M is the touch article coordinate that this algorithm calculates, and can find out that coordinate that this algorithm determines than vertical scanning method is more close to true coordinate intuitively.
Above by reference to the accompanying drawings to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present invention is conceived and technical scheme is carried out; or design of the present invention and technical scheme directly applied to other occasion, all within protection scope of the present invention without to improve.
Claims (7)
1. a touch-screen, comprise touch screen body, described touch screen body two adjacent edge is provided with infrared launcher, other two adjacent edges of described touch screen body are provided with the first infrared receiving device, it is characterized in that: described touch screen body is provided with the second infrared receiving device, described second infrared receiving device and infrared launcher are provided with edge in touch screen body and interval is arranged.
2. touch-screen according to claim 1, is characterized in that: the distance between described second infrared receiving device and touch screen body edge is less than the distance between infrared launcher and touch screen body edge.
3. touch-screen according to claim 2, is characterized in that: the distance between described first infrared receiving device and touch screen body edge is less than the distance between infrared launcher and touch screen body edge.
4. the touch-screen according to claim 1,2 or 3, is characterized in that: the microcontroller that touch-screen is provided with and controls infrared launcher, the first infrared receiving device, the second infrared receiving device switch voltage AD value after reading opto-electronic conversion carry out touch point judgement.
5., based on the localization method of the touch-screen according to any one of claim 1-4, it is characterized in that:
Step 1, driving infrared receiving device and infrared launcher, record the voltage AD value after often pair of infrared receiving device and infrared launcher opto-electronic conversion;
Step 2, the touch point number possible with the AD value multilevel iudge of setting according to the AD value of record, if do not touched, return step 1, scan next time; If there is touch point, then jump to step 3;
Step 3, according to record AD value, judge that first scanning that is tilted to the left is in the light road D1, judge that last is tilted to the right and scan the road D2 that is in the light, judge that first scanning that is inclined upwardly is in the light road D3, judge that last downward-sloping scanning is in the light road D4, determine touch objects four limit edge line D1, D2, D3, D4, calculate the average coordinates M of four intersection points A, B, C, D of four limit edge line D1, D2, D3, D4, coordinate M is the location of touch point;
Step 4, return step 1.
6. localization method according to claim 5, is characterized in that: in described step 1, and infrared receiving device and infrared launcher circulate successively according to putting in order and driven.
7. localization method according to claim 5, is characterized in that: in described step 3, after determining four edges boundary line D1, D2, D3, D4, sets up their equations to be: D1 is y=k
1x+b
1, D2 is y=k
2x+b
2, D3 is y=k
3x+b
3, D4 is y=k
4x+b
4, the parameter k of equation
1, b
1, k
2, b
2, k
3, b
3, k
4, b
4it is the given value obtained according to coordinate; D1 and D3 has intersection point, and intersection point A coordinate is
d2 and D3 has intersection point, and intersection points B coordinate is
d2 and D4 has intersection point, and intersection point C coordinate is
d1 and D4 has intersection point, and intersection point D coordinate is
then M is
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510938162.4A CN105549796B (en) | 2015-12-15 | 2015-12-15 | A kind of touch screen and its touch localization method |
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|---|---|---|---|
| CN201510938162.4A CN105549796B (en) | 2015-12-15 | 2015-12-15 | A kind of touch screen and its touch localization method |
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| Publication Number | Publication Date |
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| CN105549796A true CN105549796A (en) | 2016-05-04 |
| CN105549796B CN105549796B (en) | 2018-11-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105975139A (en) * | 2016-05-11 | 2016-09-28 | 青岛海信电器股份有限公司 | Touch point extraction method, device and display equipment |
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| CN101071356A (en) * | 2007-06-15 | 2007-11-14 | 广东威创日新电子有限公司 | Infrared touch screen and its multi-point touch positioning method |
| CN101995998A (en) * | 2009-08-21 | 2011-03-30 | 厦门信烨联动传媒有限公司 | Infrared touch screen and multi-point touch positioning method thereof |
| CN101995997A (en) * | 2009-08-21 | 2011-03-30 | 厦门信烨联动传媒有限公司 | Multipoint infrared touch screen and touch positioning method thereof |
| CN102193690A (en) * | 2011-05-31 | 2011-09-21 | 中航华东光电有限公司 | Infrared touch screen and multi-touch positioning method thereof |
-
2015
- 2015-12-15 CN CN201510938162.4A patent/CN105549796B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101071356A (en) * | 2007-06-15 | 2007-11-14 | 广东威创日新电子有限公司 | Infrared touch screen and its multi-point touch positioning method |
| CN101995998A (en) * | 2009-08-21 | 2011-03-30 | 厦门信烨联动传媒有限公司 | Infrared touch screen and multi-point touch positioning method thereof |
| CN101995997A (en) * | 2009-08-21 | 2011-03-30 | 厦门信烨联动传媒有限公司 | Multipoint infrared touch screen and touch positioning method thereof |
| CN102193690A (en) * | 2011-05-31 | 2011-09-21 | 中航华东光电有限公司 | Infrared touch screen and multi-touch positioning method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105975139A (en) * | 2016-05-11 | 2016-09-28 | 青岛海信电器股份有限公司 | Touch point extraction method, device and display equipment |
| CN105975139B (en) * | 2016-05-11 | 2019-09-20 | 青岛海信电器股份有限公司 | Touch point extracting method, device and display equipment |
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| CN105549796B (en) | 2018-11-13 |
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