CN102360255A - Infrared touch screen parallel scanning system and method for increasing infrared scanning speed without increasing peak current - Google Patents
Infrared touch screen parallel scanning system and method for increasing infrared scanning speed without increasing peak current Download PDFInfo
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- CN102360255A CN102360255A CN2011102845530A CN201110284553A CN102360255A CN 102360255 A CN102360255 A CN 102360255A CN 2011102845530 A CN2011102845530 A CN 2011102845530A CN 201110284553 A CN201110284553 A CN 201110284553A CN 102360255 A CN102360255 A CN 102360255A
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Abstract
The invention discloses an infrared touch screen parallel scanning system and a method for increasing infrared scanning speed without increasing peak current. A signal phase inverter is arranged on an X or Y axis of the traditional infrared transmission module circuit and is mainly an NOT gate circuit consists of a crystal triode, each module of the infrared touch screen adopts parallel scanning; the pulse time sharing opening time of each infrared transmission pipe on the axis of a microcontroller system, provided with the signal inverter, is just staggered with the opening scanning of an infrared transmission pipe on the other axis, and when an infrared receiving pipe processes signals, a stable receiving signal is captured by using a peak maintaining circuit. Because the signal phase inverter is arranged on one axis of the infrared transmission module circuit, the method for opening infrared transmission LEDs in a pulse type time sharing manner better solves the problem of increase of consumed current; and one transmission LED pipe works at one moment on the microcosmic view and multiple paths of scanning are carried out simultaneously on the macrocosmic view, thus the scanning speed is increased and the peak current is not increased.
Description
Technical field
The present invention relates to a kind of infrared touch panel, refer to the parallel scanning system of infrared touch panel especially, and use this system to improve red sweep velocity and do not increase the method for peak point current.
Background technology
Infrared touch system makes man-machine interaction more directly perceived as a kind of novel computer entry device.The infrared touch technology also is applied in fields such as information household appliances, public information, electronic game, business automation equipment except being applied in portable personal information products field.Existing infrared touch system generally includes two groups of corresponding infrared transmitting tube and infrared receiving tubes that are provided with, and these two groups of infrared transmitting tubes and infrared receiving tube are formed the vertical scanning infrared array on horizontal and vertical.Under situation about touching; This two groups infrared transmitting tube and infrared receiving tube periodically scan display screen; According to laterally and the position of the infrared receiving tube that changes of the reception signal vertically, can confirm that the touch point is at difference position coordinates constantly.But because each scan period all will be carried out run-down successively to infrared transmitting tube and infrared receiving tube on laterally reaching vertically, need expend for a long time, the problem of responding scanning speed can occur; Special the number of needed infrared transmitting tube and infrared receiving tube is more for the bigger infrared touch system of display screen, and the run-down required time is longer, the problem of infrared touch system response speed more can occur.
The method of more existing at present raising infrared touch system sweep velocitys; As shorten service time of every pair of infrared transmitting tube and infrared receiving tube; But owing to shortened the service time of infrared transmitting tube; In order to make infrared receiving tube in service time, can receive the signal that infrared transmitting tube is launched, then must increase the emissive power of infrared transmitting tube, long-time high power work can shorten the serviceable life of infrared transmitting tube.The existing large scale touch-screen sweep velocity that improves can shorten the working time Wt of each LED to pipe usually, but this is conditional; Because having under the situation of modulation-demodulation circuit; Wt can not shorten significantly, because receive the time-delay that always there are tens uS in the signal processing circuit of LED pipe, is good solution so adopt the mode of also line scanning; But and the line scanning meeting increase that brings peak point current because open several emission LED electric current that can significantly increase consumption simultaneously.
Increase along with the touch-screen size; The quantity of infrared tube increases thereupon; Scan period is elongated; Be unfavorable for touching the fluency that line waits operation, infrared emission with 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, 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.The communication power taking interface of most convenient is a USB interface now in addition, and the maximum 500mA of supply current is advisable to be no more than 400mA, so will improve the large scale touch screen performance, must improve the touch-screen sweep velocity, but can not increase peak point current again.
Chinese patent number discloses a kind of infrared touch panel that multiplied unit is arranged for CN/201020624062.7; The circuit board framework that comprises the rectangle that is spliced to form by some relatively independent circuit board assemblies correspondences; In the circuit board framework, form an infrared ray matrix that intersects anyhow; Infrared transmitting tube that welds on every circuit board assemblies or infrared receiving tube receive a micro-control unit to control it to scan at least, each circuit board assemblies parallel connection or be connected on the bus, and this bus also is electrically connected with micro controller system; The instruction that described micro controller system sends through bus transfer to each micro-control unit; The result that each micro-control unit will execute instruction is transferred to micro controller system again by bus, and micro controller system is through gathering each micro-control unit data, with synthetical collection to data-switching become touch coordinate; Be transferred to computing machine through communication protocol; Adopt such structure to have the fast characteristics of the fast response speed of scanning,, can cause the rising of cost and the increase of peak point current undoubtedly owing to adopted a plurality of microcontrollers.
Summary of the invention
Slow in order to solve existing large scale touch-screen sweep velocity; The cycle that scanning detects is long and cause touching device for problems such as the delay of operation are excessive; And open can significantly the increase consumption problem of electric current of several infrared emission LED simultaneously; The object of the present invention is to provide a kind of infrared touch screen parallel scanning system and improve red sweep velocity and do not increase the method for peak point current, it not only can provide sweep velocity, does not also increase peak point current.
To achieve these goals; The present invention has adopted following technical scheme: design a kind of infrared touch screen parallel scanning system; Comprise some to infrared emission one to one with receive pipe; Be used to drive infrared transmitting tube transmitter module, 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 through 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 said driver module and the filter amplification circuit that is connected with receiver module photosignal output terminal, described transmitter module circuit wherein one be provided with a signal inverter.
In order to reach better goal of the invention, the present invention also has following technical characterictic: described signal inverter is on the circuit of the not circuit of transistor composition and Y axle that is arranged on transmitter module or X axle.
Improve red sweep velocity and do not increase the method for peak point current based on infrared touch screen parallel scanning system, comprise the steps;
A, each module of infrared touch panel are carried out and line scanning successively;
It is that the pulse timesharing is opened that b, micro controller system control setting have each infrared transmitting tube of one of phase inverter, and it is opened time and the infrared transmitting tube on another and opens the scanning time of opening and just avoid the peak hour;
C, infrared receiving tube utilize peak holding circuit to catch stable reception signal when signal Processing.
Owing on one of infrared emission, be provided with signal inverter; The method that the timesharing of infrared transmitting tube pulsed is opened well solves the problem of the electric current that increases consumption; A moment has only an infrared transmitting tube job on microcosmic; On macroscopic view, there is the scanning of several roads to carry out simultaneously, not only improves sweep velocity, also do not increase peak point current.
Description of drawings
74HC238 among Fig. 1 carries out addressing to emission LED, and CPUT_OE (220K square wave) signal carries out pulsed modulation to each emission LED that chooses.
Fig. 2 is for when 2 the tunnel and line scanning the time, and the pulse-modulated signal of the 2 tunnel emission LED is OE_220K, and it and CPUT_OE are the synoptic diagram of reverse relation.
Embodiment:
Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:
With reference to figure 1, Fig. 2, the X or the Y axle of the existing infrared transmission module circuit of the present invention are provided with a signal inverter, and this signal inverter is mainly the not circuit that transistor is formed, and each module of infrared touch panel is and line scanning; Set the time that each infrared transmitting tube pulse timesharing of one of signal inverter is opened at micro controller system; It is opened time and the infrared transmitting tube on another and opens sweep time and just avoid the peak hour; In Fig. 1, can find out through the signal inverter timesharing avoid the peak hour pulse open its 74HC238 to the emission LED carry out addressing, CPUT_OE (220K square wave) signal carries out pulsed modulation to each emission LED that chooses; Fig. 2 is for when 2 the tunnel and line scanning the time, and the pulse-modulated signal of the 2 tunnel emission LED is OE_220K, and it and CPUT_OE are reverse relations; The method of utilizing the infrared transmitting tube pulsed timesharing on the week to open can well solve the problem of the electric current that increases consumption, and a moment has only an infrared transmitting tube job on microcosmic, on macroscopic view, has the scanning of several roads to carry out simultaneously; The infrared emission on each road can not opened simultaneously, be similar to the relation of multi-stage pipeline, adopt this technical scheme not only to improve sweep velocity, also do not increase peak point current, make that also touching line waits operation more smooth.
Claims (4)
1. infrared touch screen parallel scanning system; Comprise some to infrared emission one to one with receive pipe; Be used to drive infrared transmitting tube transmitter module, 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 through 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 said driver module and the filter amplification circuit that is connected with receiver module photosignal output terminal is characterized in that: described transmitter module circuit wherein one be provided with a signal inverter.
2. infrared touch screen parallel scanning system according to claim 1 is characterized in that: described signal inverter is the not circuit that transistor is formed.
3. infrared touch screen parallel scanning system according to claim 1 and 2 is characterized in that: described signal inverter is arranged on the circuit of Y axle or X axle of transmitter module.
4. a method that improves red sweep velocity based on the described infrared touch screen parallel scanning system of claim 1 and do not increase peak point current is characterized in that: comprise the steps;
A, each module of infrared touch panel are carried out and line scanning successively;
Each infrared transmitting tube that b, micro controller system control setting signal inverter are one is that the pulse timesharing is opened, and time that it is opened and scanning time of opening of the infrared transmitting tube on another just avoid the peak hour;
C, infrared receiving tube utilize peak holding circuit to catch stable reception signal when signal Processing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110284553.0A CN102360255B (en) | 2011-09-22 | 2011-09-22 | Infrared touch screen parallel scanning system and method for increasing infrared scanning speed without increasing peak current |
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| CN201110284553.0A CN102360255B (en) | 2011-09-22 | 2011-09-22 | Infrared touch screen parallel scanning system and method for increasing infrared scanning speed without increasing peak current |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110874161A (en) * | 2019-11-19 | 2020-03-10 | 深圳市拓思迪科技有限公司 | Infrared touch screen parallel scanning system capable of continuously maintaining peak value |
| CN111248889A (en) * | 2020-01-19 | 2020-06-09 | 浙江大学 | Pulse wave measuring device and method based on LED diode and LED display matrix |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992002008A1 (en) * | 1990-07-23 | 1992-02-06 | Akzo, N.V. | Infrared touch screen device for a video monitor |
| CN101067775A (en) * | 2007-06-14 | 2007-11-07 | 吴琼 | Scanning method for trapping and tracking moving target on infrared touch screen |
| CN101187843A (en) * | 2006-11-15 | 2008-05-28 | 北京汇冠新技术有限公司 | Infrared touch panel detecting element driving and mounting structure |
-
2011
- 2011-09-22 CN CN201110284553.0A patent/CN102360255B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1992002008A1 (en) * | 1990-07-23 | 1992-02-06 | Akzo, N.V. | Infrared touch screen device for a video monitor |
| CN101187843A (en) * | 2006-11-15 | 2008-05-28 | 北京汇冠新技术有限公司 | Infrared touch panel detecting element driving and mounting structure |
| CN101067775A (en) * | 2007-06-14 | 2007-11-07 | 吴琼 | Scanning method for trapping and tracking moving target on infrared touch screen |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110874161A (en) * | 2019-11-19 | 2020-03-10 | 深圳市拓思迪科技有限公司 | Infrared touch screen parallel scanning system capable of continuously maintaining peak value |
| CN111248889A (en) * | 2020-01-19 | 2020-06-09 | 浙江大学 | Pulse wave measuring device and method based on LED diode and LED display matrix |
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| CN102360255B (en) | 2014-02-26 |
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Effective date of registration: 20170106 Address after: 518000 Guangdong city of Shenzhen province Nanshan District West Road No. 1002, Piovan Rayson white letter Industrial Park 24 building 319 Patentee after: Shenzhen top technology Co., Ltd. Address before: Xinghua Road 252000 in Shandong province Liaocheng city Dongchangfu District No. 11, No. 4 Building 1 unit 102 Patentee before: Yin Zuoheng |
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