CN101788871A - Infrared touch device based on double-frequency parallel scanning - Google Patents
Infrared touch device based on double-frequency parallel scanning Download PDFInfo
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- CN101788871A CN101788871A CN200910209866A CN200910209866A CN101788871A CN 101788871 A CN101788871 A CN 101788871A CN 200910209866 A CN200910209866 A CN 200910209866A CN 200910209866 A CN200910209866 A CN 200910209866A CN 101788871 A CN101788871 A CN 101788871A
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Abstract
The invention provides an infrared touch device based on double-channel parallel scanning. The infrared touch device comprises two groups of paired infrared emitters and receivers and the corresponding driving and selecting modules, wherein each group comprises a driving module and a selecting module; the two groups of modules are subjected to synchronous control and operation by connecting the modules with the I/O (input/output) terminal of a micro-controller system; the infrared touch device further comprises two carrier generators having different frequencies, and the two carrier generators are respectively connected with the carrier inputting terminals of two groups of transmitting modules; and the infrared touch device further comprises two filter/amplifier circuits, and the transmission band of each filter circuit respectively corresponds to two output frequencies of the carrier generators. The two groups of paired infrared emitters and receivers in the invention can simultaneously scan the area to be detected, increase the scanning rate by one time at most and avoid the mutual interference in the modulation of different carriers. Therefore, the invention is particularly applicable to large infrared touch devices, has the advantages of simple software/hardware structure, low production cost, simple adjustment and the like and is suitable for industrialized production.
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 the big slightly touching device of size, 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.What patented claim 200610037391.X provided 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 based on double-frequency parallel scanning technical scheme that can improve the region-wide sweep velocity of infrared touching device.The particular content of scheme is as follows:
A kind of two-way scanned infrared touch-screen that walks abreast, include some to infrared emission within the frame that is installed in infrared touch panel correspondingly with receive to pipe, be used to drive the driver module of infrared transmitting tube and be used for the gating module and the photoelectric signal processing circuit of the corresponding infrared receiving tube of power valve that synchronous selection pass and transmitter module drive, the micro controller system that the control input end by I/O port and above-mentioned module and the output terminal of photoelectric signal processing circuit are connected, carrier generator that is connected with the carrier wave input end of described driver module and the filter amplification circuit that is connected with receiver module photosignal output terminal.In the present invention, infrared emission receives has two groups to pipe and corresponding driving and gating module thereof, includes the gating module of the driver module and an infrared receiving tube of an infrared transmitting tube in every group; Worked by the micro controller system synchro control in the control input end of two pack modules by being connected with micro controller system I/O port; Also include two carrier generators that frequency is different in micro controller system, its output terminal is connected with the carrier wave input end of transmitter module in two pack modules respectively; Described filter amplification circuit also has two, is connected with the output terminal of photosignal of gating module in described two pack modules respectively; The passband of each filtering circuit wherein, all corresponding with the output frequency of the carrier generator that transmitter module connected in the group of place respectively.
In the present invention, in order to obtain the shortest sweep time, the infrared emission that is comprised in can two pack modules is set to identical with the quantity that receives pipe; Control transmits and receives the plain mode to the pipe synchronous working, be the every pair of pipe that transmits and receives module to be set all have identical address decoder, and after the end parallel connection of the same name with the control input end of these two address decoders, be connected with the I/O port of described micro controller system.
Of the present invention transmitting and receiving to managing to such an extent that mounting means also has multiple.Can for first group last be driven or the infrared emission of gating to pipe, with second group first be driven or the infrared emission of gating receives managing adjacent installation; Also can first group first be driven or the infrared emission of gating to pipe, with second group first be driven or the infrared emission of gating receives managing adjacent installation.Infrared emission in the dual mode in each group and reception are all installed according to the order that is driven with gating pipe.Perhaps, infrared emission that is comprised in two pack modules and reception replace arrangement along touch-screen frame direction of extension and are installed within the frame pipe.
The benefit of invention: by top description to summary of the invention, technical scheme disclosed in this invention as can be known is because divide infrared transmitting tube and receiving tube for two groups, use the carrier modulation of different frequency to scan whole detected zone simultaneously and can not produce the phenomenon that interferes with each other, therefore can improve sweep velocity is up to one times, so be 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: the connection diagram between the one group of power valve among the present invention and the emission driver module of matrix structure;
Fig. 3: group of received pipe among the present invention and the syndeton synoptic diagram between the gating module;
Among Fig. 1, the 101st, be scanned the zone of detection, 102 first groups of infrared transmitting tubes, the 103rd, the emission driver module of first group of infrared transmitting tube of driving, 104, the 109th, first group infrared receiving tube corresponding and the photoelectric detective circuit that constitutes by receiving tube with first group of infrared transmitting tube, the 105th, be used for the reception gating module of first group of infrared receiving tube of gating, the 106th, first infrared electro signal processing circuit, 107 is second group of infrared transmitting tube, the 108th, the emission driver module of second group of infrared transmitting tube of driving, the 110th, with second group of second group of photoelectric detective circuit that infrared receiving tube is made of receiving tube that infrared transmitting tube is corresponding, the 111st, be used for the reception gating module of second group of infrared receiving tube of gating, 112 is second infrared electro signal processing circuit, the 113rd, the micro controller system (MCUS) of infrared touching device control, the 114th, double frequency carrier frequency sources.
Among Fig. 2, the 201st, power valve drives the matrix column driver element, and the 202nd, row driver element, the 203rd, a carrier generator F1 in the double frequency carrier frequency sources 114, the 204th, driven infrared transmitting tube, the 205th, carrier modulation unit.
Among Fig. 3, the 301st, infrared receiving tube, the 302nd, constitute the resistance of photo-electric signal receiving circuit with infrared receiving tube, the 303rd, demultplexer, the 304th, the control circuit of the multidiameter option switch that constitutes by code translator/demultplexer.
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 has two places: the first, and infrared transmitting tube and receiving tube have been divided into independently two groups, are connected with two infrared reception gating modules with two infrared emission driver modules respectively; The second, include a double frequency carrier frequency sources 114 in the touching device, wherein include F1 and F2 totally 2 carrier generators, increased the signal processing circuit of same quantity simultaneously at receiving end.Here, 2 carrier generators in the carrier frequency sources group 114 can be made of a reference frequency generator and a frequency divider, also can utilize carrier frequency of an I/O port output of micro controller system, as F1, then arrive another carrier frequency such as F2 with the frequency divider frequency division again.
Can see in Fig. 1: infrared emission and receiving tube are installed in the edge of detected surface 101; First group of infrared transmitting tube 102 driven by first emission driver module 103, and this driver module is connected with the I/O port of micro controller system 113 by the address date line; At receiving end, first group of infrared receiving tube and the photosignal testing circuit 104 and 109 that constitutes by receiving tube, be connected with the gating module 105 of the first group of received pipe, and this gating module also is connected with the I/O port of micro controller system 113 by the address date line; And the output terminal of the testing circuit that constitutes by the receiving tube of gating and by receiving tube in this group then is connected by the input end of gating module 105 with first signal processing circuit 106.Signal processing circuit 106 is made of filter unit f1 and magnification processing A1; The passband of filter unit f1 wherein, corresponding with the frequency that a carrier generator F1 in the carrier frequency sources is generated.Among the figure, the order of connection of signal processing circuit 106 is a kind of possible constructions, but flexible design in actual applications.Generally speaking, in fact filter unit is an ingredient in the signal processing circuit, wherein often also includes the active component as amplifier and so on.
The structure of second group of infrared transmitting tube and receiving tube and mating part thereof, identical with first group, be summarized as follows: second group of infrared transmitting tube 107 driven by second emission driver module 108, and this driver module also is connected with the I/O port of micro controller system 113 by the address date line; Second group of infrared receiving tube and the photosignal testing circuit 110 that is made of receiving tube are connected with the gating module 111 of the second group of received pipe, and this gating module also is connected with the I/O port of micro controller system 113 by the address date line; The output terminal of the testing circuit that constitutes by the receiving tube of gating and by receiving tube is connected by the input end of gating module 111 with first signal processing circuit 112.Signal processing circuit 112 is made of filter unit f2 and magnification processing A2; The passband of filter unit f2 wherein, corresponding with the frequency that carrier generator F2 in the carrier frequency sources is generated.
As can also be seen from Figure, the address date line of two transmitter modules and two receiver modules can be in parallel with the connected mode mutually of the I/O port of micro controller system 113, to reach each pipe is driven purpose with gating synchronously.
Fig. 2 is a kind of radiating circuit that can be used for the matrix structure of infrared transmitting tube driving, the i.e. driver module of matrix structure.What this figure provided is to constitute one 8 * 8 driving matrix by row driver element 201 and row driver element 202, can drive 64 infrared transmitting tubes 204.Give a carrier generator 203 in the double frequency carrier frequency sources 114 among the figure and utilize an a kind of possible constructions that as modulator carrier wave is applied among the drive signal of power valve with gate driver 205, realizes the modulation of carrier wave.In the actual design, the quantity of infrared transmitting tube in visual every group is used for one group of infrared transmitting tube part power valve or all drivings of power valves.These two driver elements by being used to select to launch the address date line of address, are connected with the I/O interface of micro controller system 113 again.These two unit can use line decoder/demultplexer to constitute, and as the requirement according to output level and output port quantity, use the independent or cascade formation of logical circuits such as 74HC138 or 74HC238.Because the circuit of this part is widely used in existing infrared touch panel, so need not in this detailed description.As shown in the figure, each infrared transmitting tube 204 connects between the output port of be expert at driver element and row driver element.
What Fig. 3 provided is a kind of structure that can be used for the gating module 105,111 of infrared receiving tube group 104,110, and photosignal testing circuit that is made of for core infrared receiving tube 301 and the syndeton between the signal processing circuit 106,112.Every infrared receiving tube 301 is connected with corresponding resistance 302 among the figure, has constituted each photosignal testing circuit.With first group of infrared receiving tube is example, the signal output part of each photosignal testing circuit, be connected with each stationary contact that a hilted broadsword is thrown analog switch (demultplexer) 303 more respectively, hilted broadsword is thrown the output terminal of each stationary contact of analog switch as detection signal more, is connected with the input end of signal processing circuit 106; Hilted broadsword is thrown gating circuit 304 controls of analog switch (demultplexer) 303 by the power valve group more, and the two has constituted the reception gating module 105 of infrared receiving tube jointly.Because being connected between photosignal testing circuit and the signal processing circuit is the structure of multiselect one, so the line decoder/demultplexer cascade of can using of gating circuit 304 constitutes the matrix structure of N * 1.Here, gating circuit can use and can distribute the logical circuit of exporting high level to constitute as 74HC238, according to the quantity of receiving tube what, determines the structure of cascade.The address date line of gating circuit 304 is connected with the I/O interface of micro controller system 113.
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 make up the circuit structure of multiple reality,, other available structure can also be arranged as the photosignal testing circuit that constitutes by infrared receiving tube; Launch the carrier modulator in the driver module for another example, also can be arranged on the output terminal of row output unit.Therefore, replacement, improvement, reduction on basic technical scheme of the present invention basis all belong within protection scope of the present invention.
Claims (7)
1. the parallel scanning infrared touch device of a two-way, include some to infrared emission within the frame that is installed in infrared touching device correspondingly with receive to pipe, be used to drive the driver module of infrared transmitting tube and be used for the gating module and the photoelectric signal processing circuit of the corresponding infrared receiving tube of power valve that synchronous selection pass and transmitter module drive, the micro controller system that the control input end by I/O port and above-mentioned module and the output terminal of photoelectric signal processing circuit are connected, carrier generator that is connected with the carrier wave input end of described driver module and the filter amplification circuit that is connected with receiver module photosignal output terminal, it is characterized in that: described infrared emission receives has two groups to pipe and corresponding driving and gating module thereof, includes a described driver module and a described gating module in every group; Worked by the micro controller system synchro control in the control input end of described two pack modules by being connected with described I/O port; Also include two carrier generators that frequency is different in described micro controller system, its output terminal is connected with the carrier wave input end of transmitter module in two pack modules respectively; Described filter amplification circuit also has two, is connected with the output terminal of photosignal of gating module in described two pack modules respectively; The passband of each filtering circuit wherein, all corresponding with the output frequency of the carrier generator that transmitter module connected in the group of place respectively.
2. infrared touching device according to claim 1 is characterized in that: the infrared emission that is comprised in described two pack modules is identical to the quantity of pipe with reception.
3. infrared touching device according to claim 1, it is characterized in that: described two pack modules have the address decoder of the identical emission reception of structure to pipe, after the end parallel connection of the same name of the control input end of described address decoder, be connected with the I/O port of described micro controller system.
4. according to claim 1 or 2,3 described infrared touching devices, it is characterized in that: infrared emission that is comprised in described two pack modules and reception are arranged to two opposite directions along the touching device frame respectively and are installed the power valve in the pipe.
5. infrared touching device according to claim 4, it is characterized in that: infrared emission that is comprised in described two pack modules and reception are to pipe, its erection sequence be first group last be driven or the infrared emission of gating to pipe, with second group first be driven or the infrared emission of gating receives managing adjacent installation, and infrared emission in each group and reception are installed according to the order that is driven with gating pipe.
6. infrared touching device according to claim 4, it is characterized in that: infrared emission that is comprised in described two pack modules and reception are to pipe, its erection sequence be first group first be driven or the infrared emission of gating to pipe, with second group first be driven or the infrared emission of gating receives managing adjacent installation, and infrared emission in each group and reception are installed within the described frame according to the order that is driven with gating pipe.
7. according to claim 1 or 2,3 described infrared touching devices, it is characterized in that: infrared emission that is comprised in described two pack modules and reception replace arrangement along touching device frame direction of extension and are installed within the frame pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910209866A CN101788871A (en) | 2009-11-04 | 2009-11-04 | Infrared touch device based on double-frequency parallel scanning |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910209866A CN101788871A (en) | 2009-11-04 | 2009-11-04 | Infrared touch device based on double-frequency parallel scanning |
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| CN101788871A true CN101788871A (en) | 2010-07-28 |
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| CN200910209866A Pending CN101788871A (en) | 2009-11-04 | 2009-11-04 | Infrared touch device based on double-frequency parallel scanning |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104680894A (en) * | 2013-12-02 | 2015-06-03 | 上海数好数字信息科技有限公司 | Two-dimensional horizontal projectile experiment instrument |
| CN112799546A (en) * | 2021-01-26 | 2021-05-14 | 广州创知科技有限公司 | Touch detection method and device, interactive panel and storage medium |
| CN112799546B (en) * | 2021-01-26 | 2024-05-31 | 广州创知科技有限公司 | Touch detection method and device, interaction panel and storage medium |
-
2009
- 2009-11-04 CN CN200910209866A patent/CN101788871A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104680894A (en) * | 2013-12-02 | 2015-06-03 | 上海数好数字信息科技有限公司 | Two-dimensional horizontal projectile experiment instrument |
| CN112799546A (en) * | 2021-01-26 | 2021-05-14 | 广州创知科技有限公司 | Touch detection method and device, interactive panel and storage medium |
| CN112799546B (en) * | 2021-01-26 | 2024-05-31 | 广州创知科技有限公司 | Touch detection method and device, interaction panel and storage medium |
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Owner name: SHENZHEN NEW MOUNTAIN EAGLE INTERACTIVE TECHNOLOGY Free format text: FORMER OWNER: SHENZHEN MOUNTAIN EAGLE TECHNOLOGY CO., LTD. Effective date: 20120329 |
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Effective date of registration: 20120329 Address after: 518000 Guangdong city of Shenzhen province Baoan District Fuyong Street Huaide Chui Industrial Park District Yongde industrial center building third layer B Applicant after: Shenzhen Mountain Eagle Science & Technology Co., Ltd. Address before: 1 A block 401, linen Art Park, Xixiang street, Guangdong, Shenzhen 518000, China Applicant before: Shenzhen? Mountain Eagle Science and Technology Limited |
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Application publication date: 20100728 |