CN202904534U - Infrared touch screen with high resolution - Google Patents
Infrared touch screen with high resolution Download PDFInfo
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- CN202904534U CN202904534U CN 201220262084 CN201220262084U CN202904534U CN 202904534 U CN202904534 U CN 202904534U CN 201220262084 CN201220262084 CN 201220262084 CN 201220262084 U CN201220262084 U CN 201220262084U CN 202904534 U CN202904534 U CN 202904534U
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- touch screen
- screen
- infrared
- optical fiber
- touch
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Abstract
The utility model relates to an infrared touch screen with high resolution. The infrared touch screen with the high resolution comprises a rectangular screen. Infrared sector light sources are placed on two or more than two vertexes of the rectangular screen. A plastic optical fiber is paved on four sides of the rectangular screen. When an opaque shielding object is on the touch screen, the optical fiber is capable of providing accurate coordinates of initial positions and end positions of the shadow of the opaque shielding object on the four sides of the touch screen. One end of the plastic optical fiber is arranged on one edge of the touch screen and is used for sensing infrared light. The other end of the plastic optical fiber is connected with a photoelectric sensor. The photoelectric sensor is used for receiving optical fiber data and transmitting the data to a touch screen positioning module. A triangle comprising the shielding object or a quadrangle comprising the shielding object is constructed by the touch screen positioning module according to each light source and the initial position and the end position of the shadow corresponding to the light source. Position of the shielding object is obtained by overlapping of a plurality of polygons. According to the infrared touch screen with the high resolution, cost of the touch screen is reduced, and resolution is improved.
Description
Technical field
The utility model relates to a kind of infrared touch panel.
Background technology
Touch-screen is a kind of transparent absolute positioning system of using in conjunction with display, and transparent and good positioning principle is its technical characterictic.The touch-screen that is applied at present each occasion mainly contains four kinds: resistive touch screen, capacitive touch screen, surface acoustic wave touch screen and infrared touch panel.Wherein the visual effect of infrared touch panel and positioning principle all are better than other touch screen technology, and are not subjected to electric current, voltage and electrostatic interference, and the rugged environment condition can suit.Adopt the touch screen of acoustics and other materialogy technology that its barrier that is difficult to go beyond is arranged, impaired, aging such as single-sensor, touch interface is afraid of contaminated, the destructive use safeguarded numerous and diverse etc. problem.But, to compare with other three kinds of touch-screens, also there is the low and flimsy problem of sensor of resolution in infrared touch panel, so the raising of infrared screen resolution and stability is the key of its development prospect
The infrared touch panel principle is very simple, just adds luminous point apart from frame-saw at display, need not to add coating or feeder controller in screen surface.Infrared touch panel is to utilize the infrared ray matrix that gathers on X, the Y-direction to detect the also touch of consumer positioning.Infrared touch panel is installed a circuit board housing in the front of display, circuit board arrange on screen four limits infrared transmitting tube and infrared receiving tube, the one by one corresponding infrared ray matrix that anyhow intersects that forms.The user is when touch screen, and finger will block anyhow two infrared rays through this position, thereby can judge the touch point in the position of screen.Any touch object all can change the infrared ray on the contact and realize touch screen operation.As shown in Figure 1, be provided with some to infrared emission wiring board and infrared receiving lines plate around the touch-screen, all circuits have formed the infrared scan module, each wiring board has comprised several infrared transmitting tubes or infrared receiving tube, each over against infrared transmitting tube and infrared receiving tube work in pairs, within a scan period, all infrared transmitting tubes all are lit once, the signal value that hot outer receiving tube detects departs from the certain amplitude of reference value and then records current touch location, finally detects laterally, vertically goes up all touch locations.
Use existing touch-screen localization method, the emission of installation infrared line and reception sensing element on the touch-screen housing, the physical resolution of touch-screen is determined by the logarithm of infraluminescence pipe and infrared receiving tube, be embodied on the screen of certain size, its physical resolution is determined by the volume of infrared transmitting tube and infrared receiving tube, but the volume of infrared tube is subjected to again the up till now restriction of technique, therefore adopts traditional infrared tube to be difficult to realize high resolving power at present.Simultaneously, large-scale infrared tube and sensor cost are higher, damage easily, safeguard numerous and diverse.
The utility model content
The purpose of this utility model is to provide a kind of infrared touch panel that is different from traditional use infrared tube.
The purpose of this utility model is achieved through the following technical solutions:
A kind of high-resolution infrared touch screen, comprise rectangular screen, the infrared covering of the fan light source of placing respectively on the two or more summits of rectangular screen, the plastic optical fiber of on the rectangular screen four edges, laying respectively, when having light tight shelter on the touch-screen, this optical fiber can provide the accurate coordinates that play last position of shade on four limits of the light tight shelter on the touch-screen; One end of plastic optical fiber is arranged on the screen limit, is used for the sensing infrared light, and the other end is connected to photoelectric sensor; Photoelectric sensor receives fiber data, and is transferred to the touch-screen locating module; The touch-screen locating module constructs triangle or a quadrilateral that comprises shelter with the last position of rising of each light source and the corresponding shade of this light source, and is overlapping by a plurality of polygons are carried out, and obtains the position of shelter.
Beneficial effect
The utility model provides a kind of traditional infrared of not using to the infrared touch panel of pipe mode, has reduced the cost of touch-screen, and has improved resolution.
Description of drawings
Fig. 1 is the structural drawing of traditional infrared touch-screen;
Fig. 2 is the modular structure figure of infrared touch panel among the utility model embodiment;
Fig. 3 is the synoptic diagram of locating among the utility model embodiment;
Fig. 4 be among the utility model embodiment plastic optical fiber put synoptic diagram;
Fig. 5 is planar fibre bundle synoptic diagram of arranging among the utility model embodiment;
Fig. 6 is the principle schematic of touch-screen location among the utility model embodiment.
Wherein, 1 is camera, and 2 is the infrared scan module, and 3 is infrared transmitting tube, and 4 is infrared receiving tube; The 5 covering of the fan light sources for the utility model employing.
Embodiment
Below in conjunction with accompanying drawing, specify preferred implementation of the present utility model.
Present embodiment uses the method that is different from the traditional infrared touch-screen to carry out the infrared touch panel location.Fig. 3 is the modular structure figure of the infrared touch panel in the present embodiment.In the present embodiment, place respectively an infrared wire laser instrument on four summits of rectangular touch screen and replace traditional infrared transmitting tube.The linear laser device is to add a glass lens at common laser instrument, and pointolite is converted into linear light source.Use traditional thread binding laser instrument, just solved the low light source resolution problem of traditional LED infrared tube.Simultaneously, use the close linear laser device in two or more sets positions can reduce False Rate, thereby so that detecting device has the ability that accurately detects simultaneously two or more barriers, as shown in Figure 3.
At the four edges of rectangular screen, use plastic optical fiber to replace traditional infrared receiving tube, intensive putting on four edges receives the infrared light that the infrared laser pipe launches.Putting as shown in Figure 4 of plastic optical fiber.At the four edges of rectangular screen, set up the framework of one fixed width, four angles of framework are the wire laser instrument fixedly, and the four edges of framework is used for fixed plastics optical fiber.The size of touch-screen main body frame can be made according to the size of display screen, and driven dimension, resolution are determined putting of optical fiber and number according to resolution.For example, suppose that screen size is 350*280mm, the resolution of employing is 125*100, needs so the number of plastic optical fiber just to be (125+100) * 2=450.Use intensive fibre bundle to receive laser signal, can greatly improve density and the precision of receiver.
One end of plastic optical fiber is positioned at the framework on the touch-screen limit, and the other end pools together, and changes the fibre bundle that wire is arranged into planar fibre bundle of arranging, as shown in Figure 5.For example, suppose screen four edges A, B, C, the number of fibers of D is respectively 125,100, and 125,100.Corresponding planar fibre bundle namely can be the matrix face of 25*18, the principle of correspondence can be, the 1-25 root optical fiber on AB limit is the 1st row of planar fibre bundle, 26-50 is the 2nd row, 51-75 is the 3rd row,, 101-125 is the 5th row, the 1-25 root fibre bundle on BC limit is the 6th row ... the 76-100 on DA limit is the 18th row.The fibre bundle that wire is arranged changes planar fibre bundle of arranging into, the signal that originally needed a large amount of photoelectric sensors to receive can be converted into the receivable signal of small-sized single photoelectric sensor, thereby greatly improved inbound pacing and the quantity of signal, and the reception resolution of signal.
Because fibre bundle has been transformed into planar fibre bundle, therefore, present embodiment adopts CCD image sensor or CMOS to receive photosignal, receives resolution and the precision of signal thereby greatly improved, and has greatly simplified the difficulty that software module realizes.
Main control chip is selected the S3C2440 processor in the present embodiment, and operating system is selected embedded Linux.Transplant the Opencv environment at main control chip, the function that makes embedded system have image to process becomes the control core that the comprehensive system of one is launched, controlled, processes, is shown in to collection.
The sequential of control module control system, the timesharing emission scan of 4 infrared laser pipes of control, the reception of control cmos sensor and the transmit clock of infrared tube are synchronous, and the picture signal that reception CMOS transmits is also utilized the opencv binary conversion treatment.
In control module, comprise the touch-screen locating module, be used for judging the position of screen touch.Figure 6 shows that present embodiment carries out the synoptic diagram of touch-screen location.Four light sources and corresponding shade can produce four polygons (triangle or quadrilateral), four polygons are carried out overlapping, just can obtain more accurate shelter position.
In the present embodiment, used the method for a plurality of polygon laps of a kind of specific calculating.The method flow process is simple, is highly susceptible to realizing.The implementation procedure of the method is:
1) obtain initial a plurality of polygons, each polygon comprises a vertex set and a limit set, supposes that i polygon is Poly[i], its vertex set is Poly[i] .pointSet, the limit set is Poly[i] .edgeSet; Detailed process is:
(1) obtain the polygon vertex coordinate:
I) the light source point coordinate is added Poly[i] .pointSet;
Ii) obtain shade and play last position ps and pe coordinate, if ps and pe on a limit of touch-screen, then add Poly[i with ps and pe] the .pointSet set, if ps and pe are respectively on different edge, then with ps, pe and both sides intersection point add Poly[i] the .pointSet set;
(2) summit ordering:
Seek the minimum summit of y value, if exist a plurality ofly, then basic point is called on the summit of searching x value minimum in the identical summit of y value;
Obtain successively the cosine value of vector that all points and basic point consist of and the angle of the positive dirction vector of unit length on the x axle, then the size according to cosine value sorts;
(3) according to the point that obtains after the ordering, connect successively in order, obtain Poly[i] each bar limit;
2) obtain any two polygonal laps: suppose that two polygons are p1 and p2, required part is p3:
(1) obtains the intersection point on every limit of p1 and every limit of p2;
(2) take p1 as benchmark, judge that each point among the p2 is whether in p1, if in p1, then among this some income set p3.pointSet, otherwise, obtain the intersection point on limit that this point and previous point consist of and all limits of p1, income is gathered among the p3.pointSet;
(3) take p2 as benchmark, each point of p1 is judged;
(4) remove the point that repeats among the p3;
(5) point among the p3 is sorted;
(6) obtain all limits of p3;
3) with the lap p3 that obtains as p1, with the polygon that also do not calculate as p2, repeating step 2), until obtain all polygonal laps.
The utility model is not limited only to above embodiment, everyly utilizes mentality of designing of the present utility model, does the design of some simple change, all should count within the protection domain of the present utility model.
Claims (6)
1. high-resolution infrared touch screen, it is characterized in that, comprise rectangular screen, the infrared covering of the fan light source of placing respectively on the two or more summits of rectangular screen, the plastic optical fiber of on the rectangular screen four edges, laying respectively, one end of plastic optical fiber is arranged on the screen limit, and the other end is connected to photoelectric sensor; Photoelectric sensor is connected with the touch-screen locating module.
2. a kind of high-resolution infrared touch screen according to claim 1 is characterized in that, described covering of the fan light source is infrared wire laser instrument.
3. a kind of high-resolution infrared touch screen according to claim 1 and 2 is characterized in that, described covering of the fan light source is 4, lays respectively at four summits of rectangular touch screen.
4. a kind of high-resolution infrared touch screen according to claim 3 is characterized in that, also is included in the framework of the one fixed width that the four edges of rectangular screen sets up, and four angles of framework are the wire laser instrument fixedly, the four edges fixed plastics optical fiber of framework.
5. a kind of high-resolution infrared touch screen according to claim 4 is characterized in that, an end of plastic optical fiber is positioned at the framework on the touch-screen limit, and the other end pools together, and changes the fibre bundle that wire is arranged into planar fibre bundle of arranging.
6. a kind of high-resolution infrared touch screen according to claim 5 is characterized in that, the photoelectric sensor that is connected with planar fibre bundle of arranging is CCD image sensor or CMOS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220262084 CN202904534U (en) | 2012-06-05 | 2012-06-05 | Infrared touch screen with high resolution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220262084 CN202904534U (en) | 2012-06-05 | 2012-06-05 | Infrared touch screen with high resolution |
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| Publication Number | Publication Date |
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| CN202904534U true CN202904534U (en) | 2013-04-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220262084 Expired - Fee Related CN202904534U (en) | 2012-06-05 | 2012-06-05 | Infrared touch screen with high resolution |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107506094A (en) * | 2014-05-30 | 2017-12-22 | 湖州佳格电子科技股份有限公司 | A kind of touch-screen touch area localization method |
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2012
- 2012-06-05 CN CN 201220262084 patent/CN202904534U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107506094A (en) * | 2014-05-30 | 2017-12-22 | 湖州佳格电子科技股份有限公司 | A kind of touch-screen touch area localization method |
| CN103984449B (en) * | 2014-05-30 | 2019-01-18 | 湖州佳格电子科技股份有限公司 | A kind of touch screen touch area localization method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130424 Termination date: 20140605 |