CN102799320A - Spliced ultrasonic touch screen - Google Patents

Abstract

The present invention relates to electronic devices, and particularly to a touch screen. The spliced ultrasonic touch screen comprises a touch pad, an ultrasonic receiver, a touch pen, a signal receiving module and a microprocessor system, wherein a touch area of the touch pad is divided into at least four touch signal receiving areas, and the at least four touch signal receiving areas are sequentially arranged into at least two rows; the at least four touch signal receiving areas are provided with ultrasonic receivers, and two ultrasonic transducers of the ultrasonic receivers are respectively arranged on the same side of the touch signal receiving areas; the ultrasonic receivers arranged in the touch signal receiving areas in the same row are positioned on the same straight line, and the ultrasonic receivers arranged in the touch signal receiving areas in the two adjacent rows are symmetrically arranged according to the adjacent edges. Due to the adoption of the technical scheme, the touch screen is suitable for the touch of an ultra-long touch screen, a spliced touch screen, an ultra-large touch screen and the like, and has the advantages of simple structure, low cost and the like.

Description

Splicing ultrasonic touch screen

Technical field

The present invention relates to electronic equipment, relate in particular to a kind of touch-screen.

Background technology

Growing along with multimedia technology, touch-screen applications more and more widely, like the information inquiry in telecommunication bureau, bank, street corner, city, Industry Control, multimedia teaching etc.That touch-screen has is sturdy and durable, reaction velocity fast, save the space, be easy to advantage such as interchange.Utilize this technology, the user needs only the picture and text that bump lightly on the display screen with finger or other touch parts and just can realize operating, thereby makes man-machine interaction more simple and direct, greatly facilitates the user.

Existing touch-screen mainly adopts infrared touch panel.Infrared touch panel is with respect to other touch-screens, has stable performance, series of advantages such as antijamming capability is strong, the life-span is long, precision height.Almost, capture the market of other touch-screens gradually with overwhelming advantage.But the infrared and the ability to accept of infrared touch panel are limited; At the distance infrared transmitting tube of correlation relation and the light signal between the infrared receiving tube of being far away; Possibly there is bigger decay, is unfavorable for steady operation, not be suitable for the touch of widescreen, overlength screen, super large screen or mosaic screen.

In addition, ultrasonic technology also is widely used on the touch-control product, and existing ultrasonic touch shields more common technology with reference to Fig. 1; Usually the avris at touch pad 1 is provided withultrasonic receiver 2,infrared receiving device 3, andultrasonic receiver 2 comprises two ultrasonic transducers, and felt pen is provided with ultrasonic transmission device, infrared launcher; When felt pen touches touch pad 1, producetouch point 4, felt pen can send ultrasonic signal; Ultrasonic receiver is received from distance A, the B that can calculate felt pen and two ultrasonic transducers behind the ultrasonic signal of felt pen; And the distance c between two ultrasonic transducers is known, thereby confirms the position oftouch point 4 on touch-screen 1, is true origin with one of them ultrasonic transducer; Then the coordinate of touch point on touch-screen 1 be (x, y).But the ultrasonic touch screen also exists and the above-mentioned similar technical matters of infrared touch panel, is not suitable for the touch of widescreen, overlength screen, super large screen or mosaic screen.

Summary of the invention

The object of the present invention is to provide a kind of splicing ultrasonic touch screen, to solve the problems of the technologies described above.

The technical matters that the present invention solved can adopt following technical scheme to realize:

Splicing ultrasonic touch screen; Comprise touch pad, ultrasonic receiver, felt pen; Said ultrasonic receiver comprises two ultrasonic transducer, the infrared receiving devices that are separately positioned on said touch pad avris; Two said ultrasonic transducers, said infrared receiving devices connect a signal receiving module respectively; Said signal receiving module connects a microprocessor system; Said felt pen comprise one with the matching used ultrasonic transmission device of said ultrasonic transducer, one and the matching used infrared launcher of said infrared receiving device, the touch area of said touch pad is divided at least four touch signal receiving areas, at least four touch signal receiving areas are arranged in order at least two rows;

At least four said touch signal receiving areas are equipped with said ultrasonic receiver, and two ultrasonic transducers of said ultrasonic receiver are separately positioned on the same avris of said touch signal receiving area;

The said ultrasonic receiver that said touch signal receiving area among the same row is provided with is located along the same line, and the said ultrasonic receiver that adjacent two rows' said touch signal receiving area is provided with is symmetrical set according to the straight line at adjacent edge place;

Said felt pen touches touch pad; Form the touch point; Said microprocessor system is with the longest distance in the distance of two ultrasonic transducers of ultrasonic receiver in the touch signal receiving area and said touch point; Compare with the longest distance in the distance of two ultrasonic transducers of ultrasonic receiver in another touch signal receiving area and said touch point; The ultrasonic signal that is regarded as the pairing ultrasonic receiver reception of bee-line is regarded as the touch signal receiving area that the touch point is positioned at said ultrasonic receiver place for receiving signal.

After adopting above-mentioned method for designing, need not to consider that the present invention is specially adapted to the touch of overlength, super large touch pad or splicing touch pad owing to the problem that touch pad is too big, ultrasonic receiver can't receive remote ultrasonic transmission.

Have at least two said ultrasonic receivers to receive said ultrasonic signal on the said touch pad; Two ultrasonic transducers of said ultrasonic receiver send to said signal receiving module with the ultrasonic signal that receives respectively; Said signal receiving module sends to said microprocessor system with said ultrasonic signal, and then said microprocessor system receives at least four ultrasonic signals; Said microprocessor system at first divides into groups four said ultrasonic signals at least, and two ultrasonic transducer ultrasonic waves transmitted signals of a ultrasonic receiver are one group;

Said microprocessor system handles two ultrasonic signals that a ultrasonic receiver receives earlier, calculates the distance between two ultrasonic transducers of a touch point and a ultrasonic receiver, and said microprocessor system judges a longest distance; Said microprocessor system handles two ultrasonic signals that another ultrasonic receiver receives again; Calculate the touch point apart from the distance between two ultrasonic transducers of another ultrasonic receiver, said microprocessor system judges another longest distance; Said microprocessor system compares a longest distance and another longest distance; The ultrasonic signal that is regarded as the pairing ultrasonic receiver reception of short distance is regarded as the touch signal receiving area that the touch point is positioned at said ultrasonic receiver place for receiving signal;

Two ultrasonic signals that the said ultrasonic receiver of the said touch signal receiving area at place, said microprocessor system reception touch point sends, the infrared signal that infrared receiving device sends; Obtain the positional information of touch point in said touch signal receiving area; According to the position of said touch signal zone on said touch pad, confirm the positional information of said touch point on said touch pad.

Two ultrasonic transducers of said ultrasonic receiver are arranged on the rear of said touch pad.This structure is particularly suitable for the situation that said touch pad is a transparent configuration, can improve visual effect on the one hand, on the other hand can be through touch pad protection ultrasonic receiver itself, in order to avoid ultrasonic receiver damages or receive external interference.

At said touch pad is under the situation of transparent configuration, and two ultrasonic transducers of said ultrasonic receiver can be separately positioned on the edge of said touch pad, help making more compact structure.Two ultrasonic transducers of said ultrasonic receiver can be attached to the edge of said touch pad.It is inner that two ultrasonic transducers of said ultrasonic receiver can also directly embed said touch pad edge.Like this utilization factor of light source will be higher, and structure is more succinct.

Said touch pad adopts rectangle, the preferred square that adopts.The touch signal receiving area that said touch pad is divided into is a rectangle, preferred square.

Two ultrasonic transducers in the said touch signal receiving area are separately positioned on the edge of said touch signal receiving area;

Said microprocessor system is after the distance that calculates the straight line between a said touch point and the ultrasonic transducer; Judge earlier this apart from whether greater than; Cornerwise length of the touch signal receiving area at said ultrasonic transducer place; As greater than, then the microprocessor system is regarded as said touch point not in said touch signal receiving area, no longer carries out the follow-up judgement to this touch signal receiving area.

Two adjacent adjacent edges in touch signal receiving area all exist ultrasonic transducer, a then shared ultrasonic transducer;

All there are infrared receiving device, a then shared infrared receiving device on the adjacent edge of two adjacent touch signal receiving areas.So that reduce the number of ultrasonic transducer, reduce cost.

When said microprocessor system-computed went out distance between two ultrasonic transducers of touch point and ultrasonic receiver and equates, it was longest distance that said microprocessor system is regarded as said distance.

When the microprocessor system compares a longest distance and another longest distance; Exist a longest distance to equate with another longest distance; Be regarded as the ultrasonic signal that the pairing ultrasonic receiver of straight line receives in a longest distance or another longest distance and be the reception signal, be regarded as the touch signal receiving area that the touch point is positioned at said ultrasonic receiver place.

At least two batches of ultrasonic signals are received by said microprocessor system in a setting-up time; And said setting-up time is less than the interval time of said ultrasonic transmission device emission ultrasonic signal, and then said microprocessor system is regarded as existing on the said touch pad has two touch points at least;

Said ultrasonic signal of said microprocessor system each batch of time-division processing is confirmed at least two positional informations of said touch point on said touch pad.

Beneficial effect: owing to adopt technique scheme, the present invention is applicable to the touch of overlength touch-screen, splicing touch-screen, super large touch-screen etc., has advantages such as simple in structure, with low cost.

Description of drawings

Fig. 1 is the structural representation of background technology ultrasonic touch screen;

Fig. 2 is a structural representation of the present invention;

Fig. 3 is an another kind of structural representation of the present invention;

Fig. 4 is a circuit diagram of the present invention.

Embodiment

For technological means, creation characteristic that the present invention is realized, reach purpose and effect and be easy to understand and understand, further set forth the present invention below in conjunction with concrete diagram.

With reference to Fig. 2, Fig. 3, Fig. 4; Splicing ultrasonic touch screen; Comprise touch pad 1,ultrasonic receiver 2, felt pen;Ultrasonic receiver 2 comprises that twoultrasonic transducer 21,3, twoultrasonic transducers 21 of an infrared receiving device, infraredreceiving devices 3 that are separately positioned on touch pad 1 avris connect asignal receiving module 5 respectively, andsignal receiving module 5 connects a microprocessor system 6.Felt pen comprise one with the matching used ultrasonic transmission device ofultrasonic transducer 21 81, one andinfrared receiving device 3 matching usedinfrared launchers 82; The touch area of touch pad 1 is divided at least four touchsignal receiving areas 11, and at least four touchsignal receiving areas 11 are arranged in order at least two rows.

With reference to Fig. 2, at least four touchsignal receiving areas 11 are equipped withultrasonic receiver 2, and twoultrasonic transducers 21 ofultrasonic receiver 2 are separately positioned on the same avris of touch signal receiving area 11.Theultrasonic receiver 2 that touchsignal receiving area 11 among the same row is provided with is located along the same line, and ultrasonic receiver that adjacent two rows' touchsignal receiving area 11 is provided with 2 is oppositely arranged according to adjacent edge.Felt pen touches touch pad 1;Form touch point 4;Microprocessor system 6 is with the longest distance in the distance of two ultrasonic transducers ofultrasonic receiver 2 in the touchsignal receiving area 11 21 andtouch point 4; Compare with the longest distance in the distance of two ultrasonic transducers ofultrasonic receiver 2 in another touchsignal receiving area 11 21 andtouch point 4; The ultrasonic signal that is regarded as pairingultrasonic receiver 2 receptions of bee-line is regarded as the touchsignal receiving area 11 thattouch point 4 is positioned atultrasonic receiver 2 places for receiving signal.

During practical implementation; The microprocessor system adopts following method to confirm the position of touch point 4: have at least twoultrasonic receivers 2 to receive ultrasonic signal on the touch pad 1; Twoultrasonic transducers 21 ofultrasonic receiver 2 send tosignal receiving module 5 with the ultrasonic signal that receives respectively;Signal receiving module 5 sends tomicroprocessor system 6 with ultrasonic signal, and thenmicroprocessor system 6 receives at least four ultrasonicsignals.Microprocessor system 6 at first divides into groups four ultrasonic signals at least, and two ultrasonic transducers, the 21 ultrasonic waves transmitted signals of aultrasonic receiver 2 are one group.

Microprocessor system 6 handles two ultrasonic signals thatultrasonic receivers 2 receive earlier, calculates the distance of the straight line between twoultrasonic transducers 21 of atouch point 4 and aultrasonic receiver 2, andmicroprocessor system 6 judges a longestdistance.Microprocessor system 6 handles two ultrasonic signals that anotherultrasonic receiver 2 receives again, calculatestouch point 4 apart from the distance between twoultrasonic transducers 21 of anotherultrasonic receiver 2, andmicroprocessor system 6 judges another longestdistance.Microprocessor system 6 compares a longest distance and another longest distance; The ultrasonic signal that is regarded as pairingultrasonic receiver 2 receptions of short straight line is regarded as the touchsignal receiving area 11 thattouch point 4 is positioned atultrasonic receiver 2 places for receivingsignal.Microprocessor system 6 is according to two ultrasonic signals ofultrasonic receiver 2 transmissions at 4 places, touch point, the infrared signal thatinfrared receiving device 3 sends; Obtain the positional information oftouch point 4 in touchsignal receiving area 11; According to the position of touch signal zone on touch pad 1, confirm the positional information oftouch point 4 on touch pad 1.After adopting above-mentioned method for designing, need not to consider that the present invention is specially adapted to the touch of overlength, super large touch pad 1 or splicing touch pad 1 owing to the problem that touch pad 1 is too big,ultrasonic receiver 2 can't receive remote ultrasonic transmission.The user can divide several touchsignal receiving areas 11 according to the size of touch pad 1.

Twoultrasonic transducers 21 ofultrasonic receiver 2 are arranged on the rear of touch pad 1.This structure is particularly suitable for touch pad 1 and is the situation of transparent configuration, can improve visual effect on the one hand, can itself protectultrasonic receiver 2 through touch pad 1 on the other hand, in order to avoidultrasonic receiver 2 damages or receive external interference.At touch pad 1 is under the situation of transparent configuration, and twoultrasonic transducers 21 ofultrasonic receiver 2 can be separately positioned on the edge of touch pad 1, help making more compact structure.Twoultrasonic transducers 21 ofultrasonic receiver 2 can be attached to the edge of touch pad 1.It is inner that twoultrasonic transducers 21 ofultrasonic receiver 2 can also directly embed touch pad 1 edge.Like this utilization factor of light source will be higher, and structure is more succinct.Touch pad 1 adopts rectangle, the preferred square that adopts.The touchsignal receiving area 11 that touch pad 1 is divided into is rectangle, preferred square.

With reference to Fig. 3, twoultrasonic transducers 21 in the touchsignal receiving area 11 are separately positioned on the edge of touchsignal receiving area 11; After the distance ofmicroprocessor system 6 straight line betweentouch point 4 and theultrasonic transducer 21 calculating; Judge earlier this apart from whether greater than; Cornerwise length of the touchsignal receiving area 11 atultrasonic transducer 21 places; As greater than, thenmicroprocessor system 6 is regarded astouch point 4 not in touchsignal receiving area 11, no longer carries out the follow-up judgement to this touch signal zone 11.In order to reduce the number ofultrasonic transducer 21, reduce cost, adjacent two touch signal receiving areas, 11 adjacent edges all exist under the situation ofultrasonic transducer 21, a shared ultrasonic transducer 21.All there isinfrared receiving device 3 in the adjacent edge of two adjacent touchsignal receiving areas 11, a then shared infrared receiving device.When existingtouch point 4 to be positioned at the middle part of twoultrasonic transducers 21 of a touchsignal receiving area 11; Adopt following determination methods: whenmicroprocessor system 6 calculated distance between twoultrasonic transducers 21 of touch point andultrasonic receiver 2 and equates,microprocessor system 6 was regarded as this distance and is longest distance.When existing the touch point to be positioned at the adjacent edge place of two adjacent touchsignal receiving areas 11; Adopt following determination methods: the microprocessor system compares a longest distance and another longest distance; When existing a longest distance to equate with another longest distance; Be regarded as the ultrasonic signal that the pairing ultrasonic receiver of any straight line receives in a longest distance or another longest distance and be the reception signal, be regarded as the touch point and be positioned at the touch signal receiving area that ultrasonic receiver belongs to.

At least two batches of ultrasonic signals are received bymicroprocessor system 6 in a setting-up time; And setting-up time is less than the interval time ofultrasonic transmission device 81 emission ultrasonic signals, and thenmicroprocessor system 6 is regarded as existing on the touch pad 1 and has twotouch points 4 at least.The ultrasonic signal of each batch ofmicroprocessor system 6 time-division processing is confirmed at least two positional informations oftouch point 4 on touch pad 1.Microprocessor system 6 at first handles a collection of ultrasonic signal, confirms a touch point position information, whenmicroprocessor system 6 receives a collection of ultrasonic signal once more in setting-up time, handles, and confirms another touch point position information.When many batches of ultrasonic signals are received bymicroprocessor system 6 in setting-up time, obtain a plurality of touch point position information.

Embodiment one: with reference to Fig. 2; Felt pen touches touch pad 1;Form touch point 4;Ultrasonic transducer 2b,ultrasonic transducer 2c,ultrasonic transducer 2d,ultrasonic transducer 2e,ultrasonic transducer 2f,ultrasonic transducer 2i,ultrasonic transducer 2j all receive the ultrasonic signal that felt pen sends, and a plurality ofultrasonic receivers 2 send to the microprocessor system after all ultrasound information being handled.The microprocessor system divides into groups ultrasonic transducer: 1)ultrasonic transducer 2b should with one group ofultrasonic transducer 2a; Butultrasonic transducer 2a does not receive ultrasonic signal; Then cast outultrasonic transducer 2b; Need not judge, also need not be withtouch point 4 comparing toultrasonic transducer 2b apart from straight line b and other straight line.2)ultrasonic transducer 2c andultrasonic transducer 2d are one group, calculate between 4 to two ultrasonic transducers in touch point apart from straight line c, straight line d, judging a longest distance is straight line c.3)ultrasonic transducer 2e andultrasonic transducer 2f are one group, calculate between 4 to two ultrasonic transducers in touch point apart from straight line e, straight line f, judging another longest distance is straight line f.4) the microprocessor system compares straight line c and straight line f, and it is shorter to judge straight line c.5)ultrasonic transducer 2i andultrasonic transducer 2j are one group, calculate between 4 to two ultrasonic transducers in touch point apart from straight line i, straight line j, judging another longest distance is straight line i.6) the microprocessor system compares straight line c and straight line i, and it is shorter to judge straight line c.Think that then the ultrasonic signal that the pairing ultrasonic receiver of straight line c receives is the reception signal, is regarded as the touchsignal receiving area 11 thattouch point 4 is arranged inultrasonic transducer 2c andultrasonic transducer 2d place.

Embodiment two: with reference to Fig. 3; Felt pen touches touch pad 1;Form touch point 4;Ultrasonic transducer 2a,ultrasonic transducer 2b,ultrasonic transducer 2c,ultrasonic transducer 2d,ultrasonic transducer 2f, ultrasonic transducer 2g all receive the ultrasonic signal that felt pen sends, and a plurality ofultrasonic receivers 2 send to the microprocessor system after all ultrasound information being handled.The microprocessor system divides into groups ultrasonic transducer: 1)ultrasonic transducer 2a andultrasonic transducer 2b are one group; Calculate between 4 to two ultrasonic transducers in touch point apart from straight line a, straight line b; The diagonal line of straight line a and touchsignal receiving area 11 is longer, then need not carry out follow-up judgement.2)ultrasonic transducer 2b andultrasonic transducer 2c are one group, calculate between 4 to two ultrasonic transducers in touch point apart from straight line b, straight line c, judging a longest distance is straight line b.3)ultrasonic transducer 2c andultrasonic transducer 2d are one group, calculate between 4 to two ultrasonic transducers in touch point apart from straight line c, straight line d, judging another longest distance is straight line d.4) the microprocessor system compares straight line b and straight line d, and it is shorter to judge straight line b.5)ultrasonic transducer 2f and ultrasonic transducer 2g are one group, calculate between 4 to two ultrasonic transducers in touch point apart from straight line f, straight line g, judging another longest distance is straight line f.5)microprocessor system 6 compares straight line b and straight line f, and it is shorter to judge straight line b.Think that then the ultrasonic signal that the pairing ultrasonic receiver of straight line b receives is the reception signal, is regarded as the touchsignal receiving area 11 thattouch point 4 is arranged inultrasonic transducer 2b andultrasonic transducer 2c place.

More than show and described ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; The present invention is not restricted to the described embodiments; That describes in the foregoing description and the instructions just explains principle of the present invention; Under the prerequisite that does not break away from spirit and scope of the invention, the present invention also has various changes and modifications, and these variations and improvement all fall in the scope of the invention that requires protection.The present invention requires protection domain to be defined by appending claims and equivalent thereof.

Claims (10)

1. the splicing ultrasonic touch shields; Comprise touch pad, ultrasonic receiver, felt pen; Said ultrasonic receiver comprises two ultrasonic transducer, the infrared receiving devices that are separately positioned on said touch pad avris; Two said ultrasonic transducers, said infrared receiving devices connect a signal receiving module respectively; Said signal receiving module connects a microprocessor system, said felt pen comprise one with the matching used ultrasonic transmission device of said ultrasonic transducer, one and the matching used infrared launcher of said infrared receiving device, it is characterized in that; The touch area of said touch pad is divided at least four touch signal receiving areas, and at least four touch signal receiving areas are arranged in order at least two rows;

At least four said touch signal receiving areas are equipped with said ultrasonic receiver, and two ultrasonic transducers of said ultrasonic receiver are separately positioned on the same avris of said touch signal receiving area;

The said ultrasonic receiver that said touch signal receiving area among the same row is provided with is located along the same line, and the said ultrasonic receiver that adjacent two rows' said touch signal receiving area is provided with is symmetrical set according to the straight line at adjacent edge place;

Said felt pen touches touch pad; Form the touch point; Said microprocessor system is with the longest distance in the distance of two ultrasonic transducers of ultrasonic receiver in the touch signal receiving area and said touch point; Compare with the longest distance in the distance of two ultrasonic transducers of ultrasonic receiver in another touch signal receiving area and said touch point; The ultrasonic signal that is regarded as the pairing ultrasonic receiver reception of short distance is regarded as the touch signal receiving area that the touch point is positioned at said ultrasonic receiver place for receiving signal.

2. splicing ultrasonic touch screen according to claim 1; It is characterized in that; Have at least two said ultrasonic receivers to receive said ultrasonic signal on the said touch pad; Two ultrasonic transducers of said ultrasonic receiver send to said signal receiving module with the ultrasonic signal that receives respectively, and said signal receiving module sends to said microprocessor system with said ultrasonic signal, and then said microprocessor system receives at least four ultrasonic signals; Said microprocessor system at first divides into groups four said ultrasonic signals at least, and two ultrasonic transducer ultrasonic waves transmitted signals of a ultrasonic receiver are one group;

Said microprocessor system handles two ultrasonic signals that a ultrasonic receiver receives earlier, calculates the distance between two ultrasonic transducers of a touch point and a ultrasonic receiver, and said microprocessor system judges a longest distance; Said microprocessor system handles two ultrasonic signals that another ultrasonic receiver receives again; Calculate the touch point apart from the distance between two ultrasonic transducers of another ultrasonic receiver, said microprocessor system judges another longest distance; Said microprocessor system compares a longest distance and another longest distance; The ultrasonic signal that is regarded as the pairing ultrasonic receiver reception of short distance is regarded as the touch signal receiving area that the touch point is positioned at said ultrasonic receiver place for receiving signal;

Two ultrasonic signals that the said ultrasonic receiver of the said touch signal receiving area at place, said microprocessor system reception touch point sends, the infrared signal that infrared receiving device sends; Obtain the positional information of touch point in said touch signal receiving area; According to the position of said touch signal zone on said touch pad, confirm the positional information of said touch point on said touch pad.

3. splicing ultrasonic touch screen according to claim 1 is characterized in that two ultrasonic transducers of said ultrasonic receiver are arranged on the rear of said touch pad.

4. splicing ultrasonic touch screen according to claim 1 is characterized in that, is under the situation of transparent configuration at said touch pad, and it is inner that two ultrasonic transducers of said ultrasonic receiver directly embed said touch pad edge.

5. splicing ultrasonic touch screen according to claim 1 is characterized in that said touch pad adopts rectangle, and the touch signal receiving area that said touch pad is divided into is a rectangle.

6. splicing ultrasonic touch screen according to claim 1 is characterized in that two ultrasonic transducers in the said touch signal receiving area are separately positioned on the edge of said touch signal receiving area;

Said microprocessor system is after the distance that calculates the straight line between a said touch point and the ultrasonic transducer; Judge earlier this apart from whether greater than; Cornerwise length of the touch signal receiving area at said ultrasonic transducer place; As greater than, then the microprocessor system is regarded as said touch point not in said touch signal receiving area, no longer carries out the follow-up judgement to this touch signal receiving area.

7. splicing ultrasonic touch according to claim 6 screen is characterized in that, two adjacent adjacent edges in touch signal receiving area all exist ultrasonic transducer, a then shared ultrasonic transducer;

All there are infrared receiving device, a then shared infrared receiving device on the adjacent edge of two adjacent touch signal receiving areas.

8. according to claim 1,2,6 or 7 described splicing ultrasonic touch screens; It is characterized in that; When said microprocessor system-computed went out distance between two ultrasonic transducers of touch point and ultrasonic receiver and equates, it was longest distance that said microprocessor system is regarded as said distance.

9. splicing ultrasonic touch screen according to claim 8; It is characterized in that; When the microprocessor system compares a longest distance and another longest distance; Exist a longest distance to equate, be regarded as the ultrasonic signal that the pairing ultrasonic receiver of straight line receives in a longest distance or another longest distance and be the reception signal, be regarded as the touch signal receiving area that the touch point is positioned at said ultrasonic receiver place with another longest distance.

10. splicing ultrasonic touch screen according to claim 9; It is characterized in that; At least two batches of ultrasonic signals are received by said microprocessor system in a setting-up time; And said setting-up time is less than the interval time of said ultrasonic transmission device emission ultrasonic signal, and then said microprocessor system is regarded as existing on the said touch pad has two touch points at least;

Said ultrasonic signal of said microprocessor system each batch of time-division processing is confirmed at least two positional informations of said touch point on said touch pad.

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