CN201522698U - Multi-frequency scanning infrared touch device - Google Patents
Multi-frequency scanning infrared touch device Download PDFInfo
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- CN201522698U CN201522698U CN2009202700351U CN200920270035U CN201522698U CN 201522698 U CN201522698 U CN 201522698U CN 2009202700351 U CN2009202700351 U CN 2009202700351U CN 200920270035 U CN200920270035 U CN 200920270035U CN 201522698 U CN201522698 U CN 201522698U
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Abstract
The utility model relates to a multi-frequency scanning infrared touch device, wherein infrared emission and receiving geminate transistors are divided into a plurality of groups, each emission tube in each emission tube group is driven by a carrier frequency source and a driver module of the infrared emission tube simultaneously; the number of the carrier frequency source is identical to that of emission tubes in the group, and the frequency thereof is different from that of the emission tubes. The electrooptical signal output end of each receiving tube in the receiving tube group is connected with the output ends of receiving rubes with same serial numbers in other groups, and then is respectively connected with an amplification processing unit containing filters which correspond to the output frequency of each carrier frequency source, and the processing result is sent to a microcontroller controlling the touch device so as to realize detection on the coordinate of a touched object. The multi-frequency scanning infrared touch device has the advantages of driving the parallel scanning and detection of a plurality of pairs of emission and receiving tubes in one group simultaneously, without generating the phenomenon of mutual interference, thus improving scanning speed by a plurality of times, and being applicable to infrared touch devices with larger size.
Description
Technical field
The present invention relates to a kind of infrared touching device, belong to the computer man-machine interacting technical field, detect the scanning technique field especially for the touch point of infrared touching device.
Background technology
Existing infrared touching device (being the infrared touch panel of general meaning), its primary structure and principle be on frame, install some to infrared emission with receive to pipe, the micro controller system that utilizes touching device inside then is by the I/O port, the gating module that control is used to drive the driver module of infrared transmitting tube and is used for the gating infrared receiving tube, once drive in a certain order and gating each infrared emission is received managing, finish the touch-surface scanning of direction in length and breadth.By which detects the light that transmits and receives between the pipe is blocked again, goes out the position of touch objects at display surface from the position judgment that is blocked to the pipe place.For improving the anti-interference of infrared touching device, also used carrier wave to modulate transmitting of infrared transmitting tube in the partial design, simultaneously the filtering circuit that uses passband and modulated carrier to be complementary at receiving end.
This structure is used for the less infrared touching device of size and is well suited for, but when being used for larger-size touching device, will and receive the cycles that quantity is many, scanning detects of pipe longly and cause touching device for problems such as the delay of operation are excessive because of infrared emission, influence is use normally.Especially when using modulated carrier, the time domain response characteristic of filtering circuit has more limited the shortening of scan period.At the problems referred to above, to be 200610037391.X provided the different solution of two classes with 200610140874.2 Chinese patent application to number.Patented claim 200610037391. * what provide is a kind of technical scheme that adopts a plurality of principal and subordinate's microcontrollers, though can realize fast scanning and function such as anti-interference, but the shortcoming of multiprocessor has been to increase greatly the complexity of software and hardware in the total system, has increased the design and the manufacturing cost of infrared touching device.Patented claim 200610140874.2 disclosed technical schemes; the method that has adopted a kind of touch objects to follow the tracks of shortens the needed time of senses touch thing; only relate to the change of micro controller system internal control software; therefore increase the complexity and the cost of system hardware hardly; but because following range has adopted special algorithm; so it is very fast to work as the touch objects movement velocity; perhaps suddenly during rapid movement; regular meeting has tracking to need region-wide again scan condition less than touch objects, causes occurring in the operating process pausing and sluggishness.
Summary of the invention
Purpose of the present invention is exactly the shortcoming at prior art, discloses a kind of multi-frequency scanning technical scheme that can improve the region-wide sweep velocity several times of infrared touching device.
For realizing purpose of the present invention, infrared touching device of the present invention has adopted following technical scheme:
A kind of infrared touching device, include some to infrared emission with receive to pipe, the gating module that is used to drive the driver module of infrared transmitting tube and is used for the gating infrared receiving tube, and the micro controller system of controlling above-mentioned module work, described to the infrared emission in the pipe with receive to pipe be divided into respectively that quantity is identical, some groups of mutual correspondence, the quantity of infrared transmitting tube and receiving tube is identical and by according to identical order label in each group; Every power valve all is connected with a driver in every group, each driver includes two input ends, after the input end of the same name of the driver of the infrared transmitting tube that one of them input end is identical with label in other groups is of coupled connections, be coupled with a carrier frequency sources respectively and be connected, another input end is of coupled connections together, is connected with a gating output terminal of driver module; Here, the quantity of carrier frequency sources, identical with the described quantity of respectively organizing the power valve that quantity is maximum in the power valve, and frequency has nothing in common with each other.Among the present invention in each receiving tube group each receives only the photosignal output terminal of pipe, after the output terminal of all identical with sequence number in other groups receiving tube links together, be connected with a signal magnification processing that includes band filter respectively, the quantity of described magnification processing is identical with the quantity of described carrier frequency sources, and wherein the passband of each filtering is corresponding with the output frequency of described each carrier frequency sources respectively; The power input of the photosignal testing circuit that is made of each receiving tube in every group links together, and is connected with a gating output terminal of the gating module of described receiving tube.
In the present invention, infrared emission and receive generally should be less than 10 pairs to the quantity of pipe in every group.Such one 10 line is imported the scrambler of the binary-coded decimal of 4 lines output, just can be connected with the output terminal of each magnification processing, output terminal by this scrambler is connected with the I/O port of micro controller system again, can reduce each magnification processing taking the I/O port of micro controller system.
Further, because the present invention has adopted modulated carrier,, infrared receiving tube responds better photodiode so being more suitable for frequency of utilization.Whenever receive only pairing each photosignal testing circuit of pipe among the present invention with in every group of infrared receiving tube, all include a resistance; The positive pole of receiving tube is connected with an end of resistance, and as the output terminal of testing circuit, the other end ground connection of resistance; The negative pole of receiving tube links together becomes the power input of testing circuit.Certainly receiving circuit can also adopt another kind of structure: at diode of photosignal testing circuit series connection; The back anodal in parallel ground connection of all receiving tubes in every group, negative pole are connected with an end of resistance and as the output terminal of testing circuit, the other end of resistance is connected with diode cathode, after the anodal parallel connection of diode, as the power input of testing circuit.
In the present invention, described carrier frequency sources can be made of a reference frequency generator and several frequency dividers, also can utilize carrier frequency of an I/O port output of micro controller system, is made of the frequency divider frequency division again.
In the present invention, the gating module that is used to drive the driver module of infrared transmitting tube and is used for the gating infrared receiving tube, all can constitute by line decoder/demultplexer, wherein the gating module constitutes the order gating circuit by a described line decoder/demultplexer, driver module then can constitute the order gating circuit by a described line decoder/demultplexer, also can constitute the driving matrix by two described line decoder/demultplexers.If driver module is made of the driver module of matrix structure two line decoder/demultplexers, be used to drive together the input end of being of coupled connections of the driver of each infrared transmitting tube in then described every group, be connected with a gating output terminal that drives matrix, described driver compiles end with electric current after driven power valve is connected, is connected with another output terminal of described driving matrix.
Further, the address date input end that is used to drive the driver module of infrared transmitting tube and is used for the gating module of gating infrared receiving tube, can use same group of I/O output port of described micro controller system, with the driven in synchronism that realizes managing simple form to transmitting and receiving.
The benefit of invention: by top description to summary of the invention, technical scheme disclosed in this invention as can be known because one group of infrared emission and and receive pipe in adopted multifrequency carrier modulation technology, drive in a pair of time that transmits and receives pipe at general infrared touching device, can drive many phenomenons that interfere with each other that can not produce transmitting and receiving pipe and line scanning senses touch zone in a group simultaneously, therefore energy improves sweep velocity for more than enough times, is fit to very much be applied to larger-size infrared touching device.Technical scheme of the present invention also has advantages such as software and hardware structure is simple, production cost is low, debugging is easy simultaneously, is very suitable for suitability for industrialized production.
Description of drawings
Fig. 1: the overall circuit structural representation of infrared touching device of the present invention;
Fig. 2: among the present invention a kind of emission driver module of structure matrix and and the connection diagram of each group between power valve;
Fig. 3: the syndeton synoptic diagram between every group of power valve and driving circuit and carrier frequency sources and the driver module;
Fig. 4: two kinds of driving circuits that can be used for infrared transmitting tube;
Fig. 5: the syndeton synoptic diagram among the present invention between each group of received pipe and the gating module;
Fig. 6: a kind of syndeton synoptic diagram between every group of received pipe and the signal processing circuit.
Among Fig. 1, the 101st, detected touch-surface, the 102nd, infrared transmitting tube group and driving circuit, the 103rd, the power valve driver module, the 104th, the infrared receiving tube group reaches by its photosignal testing circuit that constitutes, the 105th, photosignal testing circuit gating module and signal distribution network, the 106th, the carrier frequency sources group, the 107th, the signal processing circuit group, the 108th, touch the detection signal scrambler, the 109th, the micro controller system in the infrared touching device, the 110th, the control line of connection carrier frequency sources and micro controller system, the 111st, the communication interface of the outer computer of micro controller system and use apparatus of the present invention.
Among Fig. 2, the 201st, the line output unit in the transmitter module of matrix structure, the 202nd, be the row output unit in the transmitter module of matrix structure, 203, the 204th, two power valve group L1H1 and L2H3 that forgive driving circuit that choose wantonly, the 205th, the signal bus that the carrier frequency sources group is connected with driver element in each power valve group.
Among Fig. 3,301,303 is respectively the infrared transmitting tube in the power valve group 203,204, and 302,304 is respectively the driving circuit that matches with power valve in the power valve group 203,204.
Among Fig. 4, the 401st, the driving circuit of the Sheffer stroke gate structure that matches with power valve, the 402nd, that match with power valve and driving circuit door, the 403rd, the circuit symbol of infrared transmitting tube.
Among Fig. 5, the 501st, the gating module of receiving tube group, 502 is testing circuits of a receiving tube group and cooperation thereof, the 503rd, the signal transmission bus between photosignal testing circuit and the signal processing circuit.
Among Fig. 6,601,603 is respectively two receiving tube groups, the 602, the 604th, and the resistance of the formation that matches with receiving tube in receiving tube group photosignal testing circuit.
Specific embodiment
Below in conjunction with accompanying drawing, basic embodiment of the present invention is described.Because technical scheme involved in the present invention is the content about the circuit part that transmits and receives of infrared wire size, therefore no longer provide the concrete physical construction of infrared touching device (infrared touch panel) in an embodiment.
Fig. 1 is the overall circuit structural representation of infrared touching device of the present invention.Compare with the basic system of existing infrared touching device, difference maximum among this figure is to include in the touching device carrier frequency sources group 106, wherein include F1～F8 totally 8 carrier frequency sources, increased the signal processing circuit of same quantity simultaneously at receiving end, and the quantity of frequency source and signal processing circuit, with every group in infrared emission and receive identical to the quantity of pipe.Principle of the present invention for convenience of description, the infrared emission that comprises in every group and the quantity of receiving tube are set at 8 here, can select between only at 4-10 during actual design.The quantity that comprises pipe in every group is many more, and sweep velocity is just fast more, but circuit is also more complicated thereupon; Otherwise the quantity that comprises is few more, and circuit is just simple more, but the speed of scanning also just decreases.Consider the I/O port that reduces the shared micro controller system of whole signal processing circuits at receiving end, can use the existing encoder chip, be connected with micro controller system again after changing the output of the single channel of each amplification treatment circuit into binary-coded decimal; And existing encoder such as CD40147 have only 10 input ends, therefore in every group the quantity of infrared components (power valve and receiving tube) preferably less than 10.Therefore, used 8 one group structure in the present embodiment.Like this, the carrier frequency sources 106 of transmitting terminal just should have totally 8 of F1～F8; Filter unit 107 in the signal processing circuit of receiving end also has totally 8 of f1～f8, is that signal Processing in the signal processing circuit and amplifying unit 108 need A1～A8 totally 8 tunnel equally.Like this, just can realize every group transmit and receive to the pipe be driven simultaneously and gating, scanning transmits and receives the detected zone between the pipe group and can produce not disturb between to pipe non-, shortened greatly and finished the scanning detection needed time of whole detected zone, thereby improved the response speed of infrared touching device.Here, 8 carrier frequency sources in the carrier frequency sources group 106, can constitute by a reference frequency generator and several frequency dividers, also can utilize carrier frequency of an I/O port output of micro controller system,, constitute by the frequency divider frequency division again with after carrier frequency sources is connected by signal wire 111.
Can see in Fig. 1: infrared emission and receiving tube are installed in the edge of detected surface 101; Infrared transmitting tube group and driving circuit 102 thereof are launched driver module 103 and drive, and this driver module is connected with the I/O port of micro controller system 110 by the address date line; At receiving end, infrared receiving tube group and the photosignal testing circuit 104 that is made of receiving tube are connected with signal distribution network 105 with photosignal testing circuit gating module, and gating module wherein also is connected with the I/O port of micro controller system 110 by the address date line; And whenever being received only the pipe and the output terminal of testing circuit thereof in the receiving tube group of gating, the signal gating network by wherein then is connected to the input end of each signal processing circuit in the signal processing circuit group 107.Signal processing circuit group 107 is made of filter unit f1～f8 and magnification processing A1～A8, and the order of connection that provides among the figure is a kind of possible constructions, but flexible design in actual applications.In fact filter unit is an ingredient in each road signal processing circuit generally speaking, wherein usually also includes the active component as amplifier and so on.
By top description to concrete structure, the principle of senses touch object location of the present invention as can be known: because each the group in each the installation site on touching device is known to infrared emission and receiving tube, therefore by whenever receiving only the output situation of the corresponding signal processing circuit of pipe in detection and the receiving tube group, just whether touch objects can be arranged, and touch objects in the scan test section territory in length and breadth to the exact position coordinate.Further specify the detailed principle and the structure of this implementation column each several part below again in conjunction with other accompanying drawings.
Fig. 2 is a kind of structure of emission driver module of the matrix structure that can be used for the infrared transmitting tube group, the i.e. driver module of matrix structure.Driver module 103 among the figure constitutes one 4 * 4 example that drives matrix by row driver element 201 and row driver element 202, and these two driver elements are again by being used to select the address date line of power valve group address to be connected with the I/O interface of micro controller system 109.These two unit can use line decoder/demultplexer to constitute, as requirement according to output level and output port quantity, main size according to needed matrix, use 74HC138,139 or 74HC238, logical circuits such as 239 constitute, 4 * 4 matrixes in this figure then can use 74HC238 or 239 to constitute.Because the circuit of this part is widely used in existing infrared touch panel, so need not in this detailed description.Each infrared transmitting tube group connects between output port L1～L4, the H1～H4 of be expert at driver element and row driver element, and two unit 203,204 as among the figure are connected between L1H1 and the L2H3.Each frequency generation unit in the carrier frequency sources 106 is connected with the circuit of each infrared transmitting tube group and inside thereof then by signal bus 205.
Fig. 3 has selected two infrared transmitting tube groups 203 and 204 that the structure of infrared transmitting tube group inside is described, and and emission drive syndeton between the row and column driver element 201,202 in the matrix.Because every power valve in each power valve group all needs to be connected with a carrier frequency sources, so each power valve 301 or 303 in the group all needs to dispose respectively driver element 302 or 304.In conjunction with two kinds of structures of this given driver element of Fig. 4, can be illustrated more clearly in the syndeton of driver element and other parts.As seen from Figure 3,8 infrared transmitting tube LED11～LED18 in 203 are connected with 8 driver element D11～D18 respectively in the power valve group; 8 infrared transmitting tube LED71～LED78 in the power valve group in 204 are connected with 8 driver element D71～D78 respectively; And the driver element of same sequence number in each group is connected with 8 carrier frequency sources F1～F8 by signal bus 205 respectively again; And each power valve group has two input ends to be connected with the corresponding output end mouth of row driver element and row driver element in the driver module respectively again, as two the input end L2 and the H3 of two input end L1 of power valve group 203 and H1, power valve group 204.
Two kinds of two kinds of basic circuit structure that can be applied to above-mentioned driver element that Fig. 4 provides: Sheffer stroke gate and and door.In the Sheffer stroke gate structure, the negative pole of infrared transmitting tube 403 is connected the output terminal of Sheffer stroke gate driver element 401; And with door in, the positive pole of infrared transmitting tube 403 be connected with the door driver element 402 output terminal; Another utmost point of infrared transmitting tube then constitutes electric current and compiles end COM, on the corresponding high-low level.No matter be and door or Sheffer stroke gate driver element, its input end all has two, and a gating that is used for each power valve of power valve group drives, as the input end In1 among the figure, another is used to connect carrier frequency sources to realize the modulation of carrier wave, as the input end In2 among the figure.Be used for being connected with a gating output terminal of driver module, for example L1 or the L2 among Fig. 2 and Fig. 3 after input end that the gating of each power valve of power valve group drives links together; After another input ends of the same name that are used for connecting the driver of the input end of the carrier frequency sources infrared transmitting tube identical with other group labels are of coupled connections, be connected with the carrier frequency corresponding source, as the signal bus among Fig. 3 205.After the electric current of power valve driver element compiled end COM then links together on the same group, the structure different according to driver module perhaps was connected to another gating output terminal of driver module, as H1 among Fig. 2 and Fig. 3 or H3, perhaps is connected with driving power or earth potential.In the present invention, driver module 103 can also use line decoder/demultplexer to constitute the driver module of line output structure, be the matrix of N * 1, after at this moment the electric current of power valve compiles end COM links together on the same group, just can directly be connected touching device power Vcc or on the GND.This texture ratio is suitable for the less touching device of size, can simplify the design of emission driver module, bears bigger drive current easilier.
What Fig. 5 provided is a kind of structure that can be used for the gating module of infrared receiving tube group, and is the photosignal testing circuit that constitutes of core and the syndeton between the signal processing circuit group 107 by infrared receiving tube.Owing to relate to picking up of small-signal and transmit at the receiving end of infrared touching device, therefore the gating module 501 of receiving tube group uses line decoder/demultplexer to constitute the gating module of single file cascaded structure, be the gating module of N * 1 matrix structure, guarantee that the direct ground connection of earth terminal of photosignal testing circuit is more suitable.Here, the gating module can be used and can distribute the logical circuit of exporting high level to constitute as 74HC238, according to the quantity of the receiving tube group of want gating how much, determining to be to use the single logic circuit still is the multi-disc cascade.The example that provides among Fig. 5 is 16 road gating modules that match with transmitter module, can be formed by two 74HC238 cascades, from output port SV01～needed high level of SV16 output detection circuit.As can see from Figure 5, the photosignal testing circuit unit R U01～RU16 of each group infrared receiving tube recited above and formation thereof, and between the signal processing circuit group 107, be connected by signal bus 503, Fig. 6 has provided clearer syndeton, gives a kind of structure of photosignal testing circuit simultaneously.
In Fig. 6, with the syndeton between two groups of RU01 of head and the tail and the RU16 among the 16 group of received pipes arranged in order and the photosignal testing circuit RU01～RU16 thereof is example, and the two kinds of concrete structures and the annexation of receiving tube group and photosignal testing circuit thereof has been described.The RU01 unit has provided first kind of structure: each in the first group of received pipe 601 receives only the positive pole of pipe, all be connected with a end of a resistance in the resistor chain 602, and as the output terminal of photosignal, the other end ground connection of resistance; The positive pole of every group of received pipe links together becomes the power input of testing circuit SV01.The photosignal testing circuit that the RU16 unit provides then is another structure: increased by one group of diode 605 in circuit.Whenever receive only the back anodal in parallel ground connection of pipe 603 in the 16 group, one end of a resistance in negative pole and the resistor chain 604 is connected and as the output terminal of testing circuit, the other end of resistance is connected with a diode cathode in the diode group 605, in the diode group after the anodal parallel connection of all diodes, as the power input SV16 of testing circuit.
Though provided two kinds structure among Fig. 6, in a device, can only use a kind of structure.Because in the present invention, the output terminal of the photosignal of the receiving tube that the sequence number between the different receiving tube groups is identical, need be connected in parallel and constitute a signal line, so if the photosignal testing circuit has two kinds of structures, the unbalanced problem of output terminal current potential will occur, cause the circuit cisco unity malfunction and have influence on the operate as normal of back circuit.
Because in infrared touching device, infrared transmitting tube and receiving tube be mounted in pairing mode, driven in synchronism and gating one by one, therefore every group of power valve all has the receiving tube group of a correspondence, so address date input end that is used to drive the driver module of infrared transmitting tube and is used for the gating module of gating infrared receiving tube, should be connected with same group of I/O output port of micro controller system, with the driven in synchronism that realizes managing simple form to transmitting and receiving.In fact, this also existing just employed connected mode of infrared touching device.
Top embodiment is the most basic enforcement structure of the present invention, in the specific implementation, can basic technical scheme according to the present invention making up the circuit structure of multiple reality, can be a power-frequency source as carrier frequency sources, directly as the power supply of power valve driving circuit; If micro controller I/O port is enough for another example; so just the output terminal of signal processing circuit directly can be connected with microcontroller and save scrambler; therefore replacement, improvement, the reduction on basic technical scheme of the present invention basis all belongs within protection scope of the present invention.
Claims (10)
1. multi-frequency scanning infrared touch panel, include some to infrared emission with receive to pipe, the gating module that is used to drive the driver module of infrared transmitting tube and is used for the gating infrared receiving tube, and the micro controller system of controlling above-mentioned module work, it is characterized in that: described to the infrared emission in the pipe with receive to pipe be divided into respectively that quantity is identical, some groups of mutual correspondence, the quantity of infrared transmitting tube and receiving tube is identical and by according to identical order label in each group; Every power valve all is connected with a driver in every group, each driver includes two input ends, after the input end of the same name of the driver of the infrared transmitting tube that one of them input end is identical with label in other groups connects, be connected with a carrier frequency sources respectively, another input end links together, and is connected with a gating output terminal of described driver module; The quantity of described carrier frequency sources, identical with the described quantity of respectively organizing the power valve that quantity is maximum in the power valve, and frequency has nothing in common with each other; In described each receiving tube group each receives only the photosignal output terminal of pipe, after the output terminal of all identical with sequence number in other groups receiving tube links together, be connected with a signal magnification processing that includes band filter respectively, the quantity of described magnification processing is identical with the quantity of described carrier frequency sources, and wherein the passband of each filtering is corresponding with the output frequency of described each carrier frequency sources respectively; The power input of the photosignal testing circuit that is made of each receiving tube in described every group links together, and is connected with a gating output terminal of the gating module of described receiving tube.
2. infrared touch panel according to claim 1 is characterized in that: infrared emission and receive quantity to pipe less than 10 pairs in described every group.
3. infrared touch panel according to claim 1 and 2 is characterized in that: the output terminal of described each magnification processing is connected with the input end of scrambler that one 10 line is imported the binary-coded decimal of 4 lines output respectively; The output terminal of described scrambler is connected with the I/O port of described micro controller system.
4. infrared touch panel according to claim 1 is characterized in that: described carrier frequency sources is made of a reference frequency generator and several frequency dividers.
5. infrared touch panel according to claim 1 is characterized in that: described carrier frequency sources is made of several frequency dividers, and the signal input part of described frequency divider is connected with an I/O port of described micro controller system.
6. infrared touch panel according to claim 1 is characterized in that: described photosignal testing circuit also includes a diode, is connected to form with a resistance by infrared receiving tube is anodal; The other end ground connection of described resistance; The negative pole of described receiving tube is the power input of testing circuit.
7. infrared touch panel according to claim 1 is characterized in that: described photosignal testing circuit is connected to form by infrared receiving tube negative pole and a resistance; The plus earth of receiving tube; The other end of described resistance also is connected with the negative pole of a diode, the power input of the just very testing circuit of described diode.
8. infrared touch panel according to claim 1 is characterized in that: the described gating module that is used to drive the driver module of infrared transmitting tube and is used for the gating infrared receiving tube constitutes by line decoder/demultplexer; Described driver module constitutes the driving matrix by two described line decoder/demultplexers; Be of coupled connections in the described every group input end of driver together is connected with a gating output terminal of described driving matrix, and described driver compiles end with electric current after driven power valve is connected, is connected with another output terminal of described driving matrix; Described gating module constitutes the order gating circuit by a described line decoder/demultplexer.
9. infrared touch panel according to claim 1 is characterized in that: the described gating module that is used to drive the driver module of infrared transmitting tube and is used for the gating infrared receiving tube, all the order gating circuit for being made of line decoder/demultplexer.
10. according to claim 1 or 8,9 described infrared touch panels, it is characterized in that: the described address date input end that is used to drive the driver module of infrared transmitting tube and is used for the gating module of gating infrared receiving tube is a same group of I/O output port of described micro controller system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202700351U CN201522698U (en) | 2009-11-04 | 2009-11-04 | Multi-frequency scanning infrared touch device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009202700351U CN201522698U (en) | 2009-11-04 | 2009-11-04 | Multi-frequency scanning infrared touch device |
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| CN201522698U true CN201522698U (en) | 2010-07-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012010078A1 (en) * | 2010-07-21 | 2012-01-26 | 北京汇冠新技术股份有限公司 | Touch screen and multi-channel sampling method thereof |
| CN111949166A (en) * | 2020-08-10 | 2020-11-17 | 青岛海信商用显示股份有限公司 | Infrared touch large screen control method, infrared touch large screen and control equipment |
-
2009
- 2009-11-04 CN CN2009202700351U patent/CN201522698U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012010078A1 (en) * | 2010-07-21 | 2012-01-26 | 北京汇冠新技术股份有限公司 | Touch screen and multi-channel sampling method thereof |
| CN111949166A (en) * | 2020-08-10 | 2020-11-17 | 青岛海信商用显示股份有限公司 | Infrared touch large screen control method, infrared touch large screen and control equipment |
| CN111949166B (en) * | 2020-08-10 | 2024-02-13 | 青岛海信商用显示股份有限公司 | Infrared touch large screen control method, infrared touch large screen and control equipment |
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