Splicing ultrasonic touch screenTechnical field
The present invention relates to electronic equipment, particularly relate to a kind of touch screen.
Background technology
Growing along with multimedia technology, touch-screen applications is more and more extensive, as telecommunication bureau, bank,The information inquiry in street corner, city, Industry Control, multimedia teaching etc..Touch screen has sturdy and durable, anti-Answer that speed is fast, save space, be prone to the advantages such as exchange.Utilize this technology, if user fingerOr other touch parts touch the picture and text on display screen lightly and can be achieved with operation, so that man-machine interaction is moreBluntly, user is greatly facilitated.
Existing touch screen mainly uses infrared touch panel.Infrared touch panel is relative to other touch screens, toolThere are the series of advantages such as stable performance, capacity of resisting disturbance are strong, life-span length, precision are high.Almost with overwhelmingAdvantage, gradually capture the market of other touch screens.But the infrared emitting of infrared touch panel and accept energyPower is limited, the optical signal between the distant infrared transmitting tube in correlation relation and infrared receiving tube,There may be bigger decay, be unfavorable for steady operation, be not suitable for widescreen, overlength screen, super large screen orThe touch of mosaic screen.
It addition, ultrasonic technology is also widely used on touch-control product, existing ultrasonic touch screenRelatively common technology is provided with ultrasonic receiver 2, infrared with reference to Fig. 1, the generally avris at touch pad 1Receiving device 3, ultrasonic receiver 2 includes two ultrasonic transducers, and felt pen is provided with ultrasound wave and sends outInjection device, infrared launcher, when felt pen touches touch pad 1, produce touch point 4, and felt pen is permissibleSend ultrasonic signal, ultrasonic receiver receive can calculate after the ultrasonic signal of felt pen tactileTouch pen and distance A of two ultrasonic transducers, B, and distance c between two ultrasonic transducers isKnow, so that it is determined that the position that touch point 4 is on touch screen 1, with one of them ultrasonic transducer for sittingMark initial point, then touch point coordinate on touch screen 1 be (x, y).But ultrasonic touch screen there is alsoSimilar technical problem above-mentioned to infrared touch panel, is not suitable for widescreen, overlength screen, super large screen or splicingThe touch of screen.
Summary of the invention
It is an object of the invention to provide a kind of splicing ultrasonic touch screen, to solve above-mentioned technical problem.
Technical problem solved by the invention can realize by the following technical solutions:
Splicing ultrasonic touch screen, including touch pad, ultrasonic receiver, felt pen, described ultrasound waveReceptor includes that two are separately positioned on the ultrasonic transducer of described touch pad avris, an infrared receiver dressPutting, two described ultrasonic transducers, described infrared receiving devices connect a signal receiving module respectively,Described signal receiving module connects a microprocessor system, described felt pen include one with described ultrasound waveThe matching used ultrasonic transmission device of transducer, one matching used with described infrared receiving device infraredDischarger, the touch area of described touch pad is divided at least four touch signal receiving area, and at least fourIndividual touch signal receiving area is arranged in order at least two rows；
Touch signal receiving area described at least four is equipped with described ultrasonic receiver, described ultrasound waveTwo ultrasonic transducers of receptor are separately positioned on the same avris of described touch signal receiving area；
The described ultrasonic receiver that described touch signal receiving area in same row is arranged is positioned at alwaysOn line, the described ultrasonic receiver that the described touch signal receiving area of adjacent two rows is arranged is according to adjacentThe straight line at place, limit is symmetrical arranged；
Described felt pen touches touch pad, forms touch point, and described microprocessor system touches letter by oneIn number receiving area in two ultrasonic transducers of ultrasonic receiver and the distance of described touch pointTwo ultrasonic transducers of ultrasonic receiver and institute in distance, with another touch signal receiving areaThe longest distance stated in the distance of touch point compares, and is considered as the ultrasound wave corresponding to beeline and receivesThe ultrasonic signal that device receives, for receiving signal, is considered as touch point and is positioned at described ultrasonic receiver placeTouch signal receiving area.
After using above-mentioned method for designing, it is not necessary to consider owing to touch pad is too big, ultrasonic receiver cannot connectThe problem receiving remote ultrasonic transmission, the present invention is especially suitable for overlength, super large touch pad or spellingThe touch of contact template.
On described touch pad, at least two described ultrasonic receivers receive described ultrasonic signal, instituteThe ultrasonic signal received is sent to described by two ultrasonic transducers respectively that state ultrasonic receiverSignal receiving module, described ultrasonic signal is sent to described microprocessor by described signal receiving moduleSystem, the most described microprocessor system receives at least four ultrasonic signal；Described microprocessorFirst ultrasonic signal described at least four is grouped by system, and two of a ultrasonic receiver surpassThe ultrasonic signal that acoustic wave transducer is launched is one group；
Described microprocessor system first processes two ultrasonic signals that a ultrasonic receiver receives, meterCalculate the distance between touch point and two ultrasonic transducers of a ultrasonic receiver, described miniature placeReason device system judges a longest distance；Described microprocessor system reprocesses another ultrasonic receiverTwo ultrasonic signals received, calculate the touch point two ultrasound wave apart from another ultrasonic receiverDistance between transducer, described microprocessor system judges another longest distance；Described miniature placeOne longest distance is compared by reason device system with another longest distance, is considered as surpassing corresponding to short distanceThe ultrasonic signal that acoustic receiver receives, for receiving signal, is considered as touch point and is positioned at the reception of described ultrasound waveThe touch signal receiving area at device place；
Described microprocessor system receives the described super of the described touch signal receiving area at place, touch pointThe infrared signal that two ultrasonic signals of acoustic receiver transmission, infrared receiving device send, obtainsTouch point positional information in described touch signal receiving area, according to described touch signal region in instituteState the position on touch pad, determine described touch point positional information on described touch pad.
Two ultrasonic transducers of described ultrasonic receiver are arranged on the rear of described touch pad.ThisStructure is particularly suitable for the situation that described touch pad is transparent configuration, on the one hand can improve visual effect, separatelyOn the one hand can protect ultrasonic receiver by touch pad itself, so as not to ultrasonic receiver damage orBy external interference.
In the case of described touch pad is transparent configuration, two ultrasonic waves of described ultrasonic receiverEnergy device can be separately positioned on the edge of described touch pad, is conducive to making more compact structure.Described ultrasonicTwo ultrasonic transducers of ripple receptor can be attached to the edge of described touch pad.Described ultrasound wave connectsTwo ultrasonic transducers receiving device can also be directly embedded into inside described touch pad edge.Like this lightThe utilization rate in source will be higher, and structure is more succinct.
Described touch pad uses rectangle, it is preferred to use square.The touch signal that described touch pad is divided into connectsReceipts region is rectangle, preferably square.
Two ultrasonic transducers in described touch signal receiving area are separately positioned on described touch signalThe edge of receiving area；
Described microprocessor system is at the straight line calculated between described touch point and a ultrasonic transducerDistance after, first judge that whether this distance is more than, the touch signal at described ultrasonic transducer place receivesCornerwise length in region, such as larger than, then microprocessor system is considered as described touch point not describedIn touch signal receiving area, no longer carry out the follow-up judgement to this touch signal receiving area.
All there is ultrasonic transducer in two adjacent adjacent edges in touch signal receiving area, then altogetherWith a ultrasonic transducer；
Infrared receiving device is all there is, then altogether on the adjacent edge of two adjacent touch signal receiving areasWith an infrared receiving device.To reduce the number of ultrasonic transducer, reduce cost.
Described microprocessor system calculates two ultrasonic transducers of touch point and ultrasonic receiverBetween distance equal time, it is longest distance that described microprocessor system is considered as described distance.
When one longest distance and another longest distance are compared by microprocessor system, have one the longestDistance is equal with another longest distance, is considered as straight line institute in a longest distance or another longest distance rightThe ultrasonic signal that the ultrasonic receiver answered receives, for receiving signal, is considered as touch point and is positioned at described ultrasonicThe touch signal receiving area at ripple receptor place.
Described microprocessor system receives at least two batches of ultrasonic signals within the setting time, and describedThe setting time launches the interval time of ultrasonic signal less than described ultrasonic transmission device, the most described miniatureProcessor system is considered as on described touch pad there is at least two touch points；
The every batch of described ultrasonic signal of described microprocessor system time-division processing, determines at least twoDescribed touch point positional information on described touch pad.
Beneficial effect: owing to using technique scheme, the present invention is applicable to overlength touch screen, splicing is touchedTouch the touch of screen, super large touch screen etc., there is simple in construction, the advantage such as with low cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of background technology ultrasonic touch screen；
Fig. 2 is the structural representation of the present invention；
Fig. 3 is the another kind of structural representation of the present invention；
Fig. 4 is the circuit diagram of the present invention.
Detailed description of the invention
For the technological means making the present invention realize, creation characteristic, reach purpose and effect and be readily apparent fromSolve, the present invention is expanded on further below in conjunction with being specifically illustrating.
With reference to Fig. 2, Fig. 3, Fig. 4, splice ultrasonic touch screen, receive including touch pad 1, ultrasound waveDevice 2, felt pen, ultrasonic receiver 2 includes two ultrasonic waves being separately positioned on touch pad 1 avrisEnergy device 21, infrared receiving device 3, two ultrasonic transducers 21, infrared receiving devices 3 connect respectivelyConnecing a signal receiving module 5, signal receiving module 5 connects a microprocessor system 6.Felt pen includesOne ultrasonic transmission device 81, matching used with ultrasonic transducer 21 is joined with infrared receiving device 3The infrared launcher 82 that set uses, the touch area of touch pad 1 is divided at least four touch signal and receivesRegion 11, at least four touch signal receiving area 11 is arranged in order at least two rows.
With reference to Fig. 2, at least four touch signal receiving area 11 is equipped with ultrasonic receiver 2, ultrasonicTwo ultrasonic transducers 21 of ripple receptor 2 are separately positioned on the same of touch signal receiving area 11Avris.The ultrasonic receiver 2 that touch signal receiving area 11 in same row is arranged is positioned at same straight lineOn, the ultrasonic receiver 2 that the touch signal receiving area 11 of adjacent two rows is arranged is relative according to adjacent edgeArrange.Felt pen touches touch pad 1, forms touch point 4, and microprocessor system 6 is by a touch signalIn receiving area 11 two ultrasonic transducers 21 of ultrasonic receiver 2 with in the distance of touch point 4Longest distance, with two ultrasonic waves of ultrasonic receiver 2 in another touch signal receiving area 11Can compare with the longest distance in the distance of touch point 4 by device 21, be considered as surpassing corresponding to beelineThe ultrasonic signal that acoustic receiver 2 receives, for receiving signal, is considered as touch point 4 and is positioned at ultrasound wave receptionThe touch signal receiving area 11 at device 2 place.
When being embodied as, microprocessor system adopts the position determining touch point 4 with the following method: touchOn plate 1, at least two ultrasonic receivers 2 receive ultrasonic signal, the two of ultrasonic receiver 2The ultrasonic signal received is sent to signal receiving module 5, signal by individual ultrasonic transducer 21 respectivelyUltrasonic signal is sent to microprocessor system 6 by receiver module 5, then microprocessor system 6 receivesTo at least four ultrasonic signal.First at least four ultrasonic signal is carried out by microprocessor system 6Packet, the ultrasonic signal that two ultrasonic transducers 21 of a ultrasonic receiver 2 are launched is one group.
Microprocessor system 6 first processes two ultrasonic signals that a ultrasonic receiver 2 receives, meterCalculate the distance of straight line between touch point 4 and two ultrasonic transducers 21 of a ultrasonic receiver 2,Microprocessor system 6 judges a longest distance.Microprocessor system 6 reprocesses another ultrasound waveTwo ultrasonic signals that receptor 2 receives, calculate touch point 4 apart from another ultrasonic receiver 2Two ultrasonic transducers 21 between distance, microprocessor system 6 judges another longest distance.One longest distance is compared by microprocessor system 6 with another longest distance, is considered as short straight line instituteThe ultrasonic signal that corresponding ultrasonic receiver 2 receives, for receiving signal, is considered as touch point 4 and is positioned at superThe touch signal receiving area 11 at acoustic receiver 2 place.Microprocessor system 6 is according to touch point 4It is infrared that two ultrasonic signals of ultrasonic receiver 2 transmission at place, infrared receiving device 3 sendLine signal, obtains the touch point 4 positional information in touch signal receiving area 11, according to touch signalPosition on touch pad 1, the region, determines the touch point 4 positional information on touch pad 1.In employingAfter stating method for designing, it is not necessary to consider owing to touch pad 1 is too big, ultrasonic receiver 2 cannot receive farThe problem of the ultrasonic transmission of distance, the present invention is especially suitable for overlength, super large touch pad 1 or splicing and touchesThe touch of template 1.User can divide several touch signals receive according to the size of touch pad 1Region 11.
Two ultrasonic transducers 21 of ultrasonic receiver 2 are arranged on the rear of touch pad 1.This knotStructure is particularly suitable for the situation that touch pad 1 is transparent configuration, on the one hand can improve visual effect, the opposing partyFace can by touch pad 1 protection ultrasonic receiver 2 itself, so as not to ultrasonic receiver 2 damage orBy external interference.In the case of touch pad 1 is transparent configuration, two of ultrasonic receiver 2 surpassAcoustic wave transducer 21 can be separately positioned on the edge of touch pad 1, is conducive to making more compact structure.SuperTwo ultrasonic transducers 21 of acoustic receiver 2 can be attached to the edge of touch pad 1.Ultrasound wave connectsTwo ultrasonic transducers 21 receiving device 2 can also be directly embedded into inside touch pad 1 edge.Like thisThe utilization rate of light source will be higher, and structure is more succinct.Touch pad 1 uses rectangle, it is preferred to use square.The touch signal receiving area 11 that touch pad 1 is divided into is rectangle, preferably square.
With reference to Fig. 3, two ultrasonic transducers 21 in touch signal receiving area 11 are separately positioned on tactileTouch the edge of signal receiving area 11；Microprocessor system 6 calculating touch point 4 with one surpassAfter the distance of the straight line between acoustic wave transducer 21, first judge whether this distance is more than, ultrasonic transducerCornerwise length of the touch signal receiving area 11 at 21 places, such as larger than, then microprocessor system6 are considered as touch point 4 not in touch signal receiving area 11, no longer carry out this touch signal region 11Follow-up judgement.In order to reduce the number of ultrasonic transducer 21, reduce cost, two adjacent touchesIn the case of the adjacent edge in signal receiving area 11 all exists ultrasonic transducer 21, share one and surpassAcoustic wave transducer 21.All there is infrared receiver dress in the adjacent edge of two adjacent touch signal receiving areas 11Put 3, then share an infrared receiving device.It is positioned at a touch signal reception when there is touch point 4During the middle part of two ultrasonic transducers 21 in region 11, use following determination methods: microprocessorSystem 6 calculates the distance phase between touch point and two ultrasonic transducers 21 of ultrasonic receiver 2Deng time, microprocessor system 6 is considered as this distance for longest distance.It is positioned at two phases when there is touch pointTime at the adjacent edge of adjacent touch signal receiving area 11, use following determination methods: microprocessor systemOne longest distance is compared with another longest distance, there is a longest distance and another longest distance phaseDeng time, be considered as in a longest distance or another longest distance arbitrarily ultrasound wave corresponding to straight line and receiveThe ultrasonic signal that device receives, for receiving signal, is considered as touch point and is positioned at the touch at ultrasonic receiver placeSignal receiving area.
Microprocessor system 6 receives at least two batches of ultrasonic signals within the setting time, and when settingBetween launch interval time of ultrasonic signal, then microprocessor system 6 less than ultrasonic transmission device 81It is considered as on touch pad 1 there is at least two touch points 4.Microprocessor system 6 time-division processing is the most a collection ofUltrasonic signal, determine at least two touch point 4 positional information on touch pad 1.Miniature processFirst device system 6 processes a collection of ultrasonic signal, determines the positional information of a touch point, microprocessorWhen system 6 is received again by a collection of ultrasonic signal within the setting time, process, determine that another touchesThe positional information of point.When microprocessor system 6 receives many batches of ultrasonic signals within the setting time,Positional information to multiple touch points.
Embodiment one: with reference to Fig. 2, felt pen touches touch pad 1, forms touch point 4, ultrasonic wave transducerDevice 2b, ultrasonic transducer 2c, ultrasonic transducer 2d, ultrasonic transducer 2e, ultrasonic transducer2f, ultrasonic transducer 2i, ultrasonic transducer 2j all receive the ultrasonic signal that felt pen sends, manyIndividual ultrasonic receiver 2 is sent to microprocessor system after all ultrasound information being processed.MiniatureUltrasonic transducer is grouped by processor system: 1) ultrasonic transducer 2b should be with ultrasonic wave transducerDevice 2a mono-group, but ultrasonic transducer 2a does not receives ultrasonic signal, then cast out ultrasonic transducer2b, need not judge, without by straight with other for the distance straight line b of touch point 4 to ultrasonic transducer 2bLine compares.2) ultrasonic transducer 2c and ultrasonic transducer 2d mono-group, calculates touch point 4Distance straight line c, straight line d between two ultrasonic transducers a, it is judged that longest distance is straight line c.3) ultrasonic transducer 2e and ultrasonic transducer 2f mono-group, calculates 4 to two, touch point ultrasound waveDistance straight line e between transducer, straight line f, it is judged that another longest distance is straight line f.4) miniature placeStraight line c is compared by reason device system with straight line f, it is judged that straight line c is shorter.5) ultrasonic transducer2i and ultrasonic transducer 2j mono-group, calculates the distance between the ultrasonic transducer of 4 to two, touch pointStraight line i, straight line j, it is judged that another longest distance is straight line i.6) microprocessor system is by straight line cCompare with straight line i, it is judged that straight line c is shorter.Then think the ultrasonic receiver corresponding to straight line cThe ultrasonic signal received, for receiving signal, is considered as touch point 4 and is positioned at ultrasonic transducer 2c and ultrasound waveIn the touch signal receiving area 11 at transducer 2d place.
Embodiment two: with reference to Fig. 3, felt pen touches touch pad 1, forms touch point 4, ultrasonic wave transducerDevice 2a, ultrasonic transducer 2b, ultrasonic transducer 2c, ultrasonic transducer 2d, ultrasonic transducer2f, ultrasonic transducer 2g all receive the ultrasonic signal that felt pen sends, multiple ultrasonic receivers 2Microprocessor system it is sent to after all ultrasound information being processed.Microprocessor system is by ultrasonicWave transducer is grouped: 1) ultrasonic transducer 2a and ultrasonic transducer 2b mono-group, calculates tactileTouching distance straight line a, the straight line b between a little 4 to two ultrasonic transducers, straight line a connects with touch signalThe diagonal receiving region 11 is longer, then need not carry out follow-up judgement.2) ultrasonic transducer 2b is with ultrasonicWave transducer 2c mono-group, calculate the distance straight line b between the ultrasonic transducer of 4 to two, touch point,Straight line c a, it is judged that longest distance is straight line b.3) ultrasonic transducer 2c and ultrasonic transducer 2dOne group, calculate distance straight line c, the straight line d between the ultrasonic transducer of 4 to two, touch point, it is judged thatGoing out another longest distance is straight line d.4) straight line b is compared by microprocessor system with straight line d,Judge that straight line b is shorter.5) ultrasonic transducer 2f and ultrasonic transducer 2g mono-group, calculates tactileTouch distance straight line f, the straight line g between a little 4 to two ultrasonic transducers, it is judged that another longest distanceFor straight line f.5) straight line b is compared by microprocessor system 6 with straight line f, it is judged that straight line bShorter.Then think that the ultrasonic signal that the ultrasonic receiver corresponding to straight line b receives is reception signal,It is considered as touch point 4 and is positioned at the touch signal reception of ultrasonic transducer 2b and ultrasonic transducer 2c placeIn region 11.
The ultimate principle of the present invention and principal character and advantages of the present invention have more than been shown and described.One's own professionSkilled person will appreciate that of industry, the present invention is not restricted to the described embodiments, above-described embodiment and explanationThe principle that the present invention is simply described described in book, without departing from the spirit and scope of the present invention,The present invention also has various changes and modifications, and these changes and improvements both fall within claimed invention modelIn enclosing.Claimed scope is defined by appending claims and equivalent thereof.