CN101893968A - Signal processing circuit of infrared touch screen - Google Patents
Signal processing circuit of infrared touch screen Download PDFInfo
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- CN101893968A CN101893968A CN2009100843355A CN200910084335A CN101893968A CN 101893968 A CN101893968 A CN 101893968A CN 2009100843355 A CN2009100843355 A CN 2009100843355A CN 200910084335 A CN200910084335 A CN 200910084335A CN 101893968 A CN101893968 A CN 101893968A
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Abstract
The invention discloses a signal processing circuit of an infrared touch screen, which comprises a signal receiving circuit, a micro controller and a high-pass filter circuit, wherein the input end of the high-pass filter circuit is connected with the output end of the signal receiving circuit; the control end of the high-pass filter circuit is connected with the micro controller; and the output end of the high-pass filter circuit is connected with the micro controller. The signal processing circuit of an infrared touch screen has high anti-interference performance.
Description
Technical field
The present invention relates to a kind of signal processing circuit, relate in particular to a kind of signal processing circuit that is applied on the infrared touch panel.
Background technology
For a long time, touch-screen market is in the situation that the five colours appear, and adopts the touch-screen of different technologies to adapt to different applied environments, and the infrared touch technology is wherein a kind of just, and advantage and the deficiency of self arranged.The insider very is deeply in love the advantage of infrared touch technology, its weak point also is perfectly clear, and has made unremitting effort and improved.Up to the present, the infrared touch technology entered for the 5th generation.From its some characteristics that show, very likely among various touching techniques, show one's talent, become the seaman in touch-screen market.
Treatment circuit is the core ingredient of infrared touch panel, and the signal Processing scheme of existing treatment circuit mainly contains following several: first kind of scheme is for simply carrying out filtering and amplification to infrared single pulse signal; Second kind of scheme handled for single pulse signal being carried out sampling hold circuit, improved the ability of resisting ambient light interference; The third scheme has stronger noise resisting ability for carrier (boc) modulated signals is carried out filtering and demodulation process with respect to second kind of scheme.Though second kind of scheme and the third scheme all have greatly improved on signal condition and advantage, second kind of scheme needs the cooperation of similar instrumentation amplifier, and the third scheme needs operational amplifier and D/A converter at a high speed, and cost is all higher relatively.
Summary of the invention
At problems of the prior art, the invention provides a kind of signal processing circuit of infrared touch screen of strong interference immunity, described signal processing circuit comprises that signal collects circuit, microcontroller, described signal processing circuit also includes a high-pass filtering circuit, the input end of described high-pass filtering circuit is connected with the output terminal that described signal is collected circuit, the control end of described high-pass filtering circuit is connected with described microcontroller, and the output terminal of described high-pass filtering circuit is connected with described microcontroller.
Further, described high-pass filtering circuit is made of an electric capacity and an analog switch, the input end of described electric capacity is connected with the output terminal that described signal is collected circuit, the output terminal of described electric capacity is connected with described microcontroller, one end of described analog switch is connected with circuit node between described electric capacity and the described microcontroller, the other end and the reference potential of described analog switch join, and the control end of described analog switch is connected with described microcontroller.
Further, described reference potential is 0V.
Further, described signal is collected between the input end of the output terminal of circuit and described electric capacity and is in series with an amplifier.
Further, be in series with an amplifier and an A/D transducer between the output terminal of described electric capacity and the described microprocessor, described amplifier input terminal is connected with the output terminal of described electric capacity, the output terminal of described amplifier is connected with the input end of described A/D transducer, and the output terminal of described A/D transducer is connected with described microcontroller.
Further, be in series with an amplifier and a comparer between the output terminal of described electric capacity and the described microprocessor, described amplifier input terminal is connected with the output terminal of described electric capacity, the output terminal of described amplifier is connected with the input end of described comparer, and the output terminal of described comparer is connected with described microcontroller.
Further, described comparer is a voltage comparator.
Further, described amplifier is the amplifier with automatic gain AGC function.
This infrared touch panel treatment circuit of the present invention includes a high-pass filtering circuit, can make the infrared screen of using this treatment circuit have excellent interference free performance the ambient light signal filtering.It is a kind of by an electric capacity and the high-pass filtering circuit that analog switch constitutes that the present invention provides again, and this high-pass filtering circuit is simple in structure, be convenient to adjust, with low cost.
Description of drawings
Fig. 1 is the structural drawing of a kind of embodiment of infrared touch panel control and detection system;
Fig. 2 is the structural drawing of a kind of embodiment of high-pass filtering circuit among Fig. 1;
Fig. 3 is the sequential chart of high-pass filtering circuit shown in Figure 2;
Fig. 4 is a kind of structural drawing of optimizing bill of a kind of embodiment of high-pass filtering circuit shown in Figure 2.
Embodiment
The invention will be further described below in conjunction with specification drawings and specific embodiments.
With reference to Fig. 1, a kind of embodiment for a kind of infrared touch panel control and detection system of the present invention, this infrared touch panel control and detection system comprises that signal collects circuit 101, infrared transmitting tube array 102, infrared receiving tube array 103, microcontroller 104, drive current adjustment circuit 105, circuit 107 is selected in drive current amplifying circuit 106 and driving, in this control and detection system, also include a high-pass filtering circuit 108, the input end of high-pass filtering circuit 108 is connected with the output terminal that signal is collected circuit 101, the control end of high-pass filtering circuit 108 is connected with microcontroller 104, and the output terminal of high-pass filtering circuit 108 is connected with microcontroller 104.Wherein, signal is collected the signal processing circuit of the present invention that circuit 101, microcontroller 104 and high-pass filtering circuit 108 have constituted this control and detection system.Since include high-pass filtering circuit in this signal processing circuit, can be effectively with the ambient light signal filtering.The infrared touch panel of using the sort signal treatment circuit has good anti-interference.
With reference to Fig. 2, a kind of embodiment for high-pass filtering circuit among Fig. 1, this high-pass filtering circuit 108 is made of an electric capacity 201 and an analog switch 202, the input end of electric capacity 201 is connected with the output terminal that signal is collected circuit 101, the output terminal of electric capacity 201 is connected with microcontroller 104, one end of analog switch 202 is connected with circuit node A between electric capacity 201 and the microcontroller 104, the other end ground connection of analog switch 202 (reference potential is 0V), the control end of analog switch 202 is connected with microcontroller 104.This high-pass filtering circuit only is made of an electric capacity and an analog switch, and is simple in structure, is convenient to adjust low production cost.With reference to Fig. 3, sequential chart for high-pass filtering circuit shown in Figure 2, at t0 constantly, energized, analog switch 202 closures in the high-pass filtering circuit are because the switch internal resistance is very little, this moment, the time constant of high-pass filtering circuit was very little, the ambient light signal of input this moment is because near direct current, so filtered out rapidly, output is forced to be conducted into the earth; At t1 constantly, analog switch 202 disconnects, and is equivalent to the resistance infinity, can think this moment only to have electric capacity in the circuit, is equivalent to block isolating circuit, and this moment, touch-screen began to transmit, and the signal that high pass optical filtering circuit is sent is the signal that filters surround lighting; At t2 constantly, power supply disconnects.UA is the collection voltage of circuit node A among Fig. 2 among the figure, and UB is the collection voltage of circuit node B among Fig. 2, and circuit node B is that signal is collected the circuit node that circuit is connected with high-pass filtering circuit.
With reference to Fig. 4, a kind of optimization bill for a kind of embodiment of high-pass filtering circuit shown in Figure 2, between the input end of the electric capacity 201 of high-pass filtering circuit 108 and output terminal that signal is collected circuit 101, be in series with a amplifier 401 with automatic gain AGC function, between the output terminal of electric capacity 201 and microprocessor 104, be in series with a amplifier 402 and an A/D transducer 403 with automatic gain AGC function, the input end of amplifier 402 is connected with the output terminal of electric capacity 201, the output terminal of amplifier 402 is connected with the input end of A/D transducer 403, and the output terminal of A/D transducer 403 is connected with microcontroller 104.Wherein, the A/D transducer also can replace with voltage comparator.High-pass filtering circuit in this prioritization scheme has installed amplifier and the A/D transducer (or voltage comparator) with automatic gain AGC function additional, carried out optimization process to passing to signal, make microcontroller can better handle the signal that transmits, improve the accuracy of detection of entire process circuit.High-pass filtering circuit shown in Figure 4 also can only be installed amplifier 401 or amplifier 402 only is installed and A/D transducer 403 (or voltage comparator), the high-pass filtering circuit of these two kinds of structures is than the poor processing effect of high-pass filtering circuit shown in Figure 4, but the treatment effect that is better than high-pass filtering circuit shown in Figure 2 is applicable to the infrared touch panel that some is special.
Method of the present invention is not limited to the embodiment described in the embodiment, for example, the amplifier with automatic gain AGC function is changed into the combination of agc circuit and amplifier.Those skilled in the art's technical scheme according to the present invention draws other embodiment, belongs to technological innovation scope of the present invention equally.
Claims (9)
1. signal processing circuit of infrared touch screen, described signal processing circuit comprises that signal collects circuit, microcontroller, it is characterized in that: described signal processing circuit also includes a high-pass filtering circuit, the input end of described high-pass filtering circuit is connected with the output terminal that described signal is collected circuit, the control end of described high-pass filtering circuit is connected with described microcontroller, and the output terminal of described high-pass filtering circuit is connected with described microcontroller.
2. a kind of signal processing circuit of infrared touch screen according to claim 1, it is characterized in that: described high-pass filtering circuit is made up of an electric capacity and an analog switch, the input end of described electric capacity is connected with the output terminal that described signal is collected circuit, the output terminal of described electric capacity is connected with described microcontroller, one end of described analog switch is connected with circuit node between described electric capacity and the described microcontroller, the other end and the reference potential of described analog switch join, and the control end of described analog switch is connected with described microcontroller.
3. a kind of signal processing circuit of infrared touch screen according to claim 2 is characterized in that: described reference potential is 0V.
4. a kind of signal processing circuit of infrared touch screen according to claim 2 is characterized in that: described signal is collected between the input end of the output terminal of circuit and described electric capacity and is in series with an amplifier.
5. according to the described a kind of signal processing circuit of infrared touch screen of one of claim 2 to 4, it is characterized in that: be in series with an amplifier and an A/D transducer between the output terminal of described electric capacity and the described microprocessor, described amplifier input terminal is connected with the output terminal of described electric capacity, the output terminal of described amplifier is connected with the input end of described A/D transducer, and the output terminal of described A/D transducer is connected with described microcontroller.
6. according to the described a kind of signal processing circuit of infrared touch screen of one of claim 2 to 4, it is characterized in that: be in series with an amplifier and a comparer between the output terminal of described electric capacity and the described microprocessor, described amplifier input terminal is connected with the output terminal of described electric capacity, the output terminal of described amplifier is connected with the input end of described comparer, and the output terminal of described comparer is connected with described microcontroller.
7. a kind of signal processing circuit of infrared touch screen according to claim 6 is characterized in that: described comparer is a voltage comparator.
8. a kind of signal processing circuit of infrared touch screen according to claim 5 is characterized in that: described amplifier is the amplifier with automatic gain AGC function.
9. a kind of signal processing circuit of infrared touch screen according to claim 7 is characterized in that: described amplifier is the amplifier with automatic gain AGC function.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100843355A CN101893968A (en) | 2009-05-21 | 2009-05-21 | Signal processing circuit of infrared touch screen |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100843355A CN101893968A (en) | 2009-05-21 | 2009-05-21 | Signal processing circuit of infrared touch screen |
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| Publication Number | Publication Date |
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| CN101893968A true CN101893968A (en) | 2010-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100843355A Pending CN101893968A (en) | 2009-05-21 | 2009-05-21 | Signal processing circuit of infrared touch screen |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014121501A1 (en) * | 2013-02-07 | 2014-08-14 | 深圳富创通科技有限公司 | Method for implementing infrared touch screen based on infrared optical sensor |
| CN105988644A (en) * | 2015-03-05 | 2016-10-05 | 上海品奇数码科技有限公司 | Infrared touch screen circuit suitable for strong ambient light |
| CN112068737A (en) * | 2020-09-03 | 2020-12-11 | 广州华欣电子科技有限公司 | Infrared touch screen signal conditioning circuit and method |
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| CN1118083A (en) * | 1995-05-19 | 1996-03-06 | 珠海科健实业有限公司 | Infrared touch screen photoelectric detecting and positioning system |
| US7031886B1 (en) * | 2004-12-14 | 2006-04-18 | Synaptics Incorporated | Methods and systems for detecting noise in a position sensor using minor shifts in sensing frequency |
| CN201408410Y (en) * | 2009-05-21 | 2010-02-17 | 北京汇冠新技术股份有限公司 | Infrared touch screen signal processing circuit |
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| CN1118083A (en) * | 1995-05-19 | 1996-03-06 | 珠海科健实业有限公司 | Infrared touch screen photoelectric detecting and positioning system |
| US7031886B1 (en) * | 2004-12-14 | 2006-04-18 | Synaptics Incorporated | Methods and systems for detecting noise in a position sensor using minor shifts in sensing frequency |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014121501A1 (en) * | 2013-02-07 | 2014-08-14 | 深圳富创通科技有限公司 | Method for implementing infrared touch screen based on infrared optical sensor |
| CN105988644A (en) * | 2015-03-05 | 2016-10-05 | 上海品奇数码科技有限公司 | Infrared touch screen circuit suitable for strong ambient light |
| CN105988644B (en) * | 2015-03-05 | 2019-04-05 | 上海品奇数码科技有限公司 | A kind of infrared touch panel circuit suitable for strong environment light |
| CN112068737A (en) * | 2020-09-03 | 2020-12-11 | 广州华欣电子科技有限公司 | Infrared touch screen signal conditioning circuit and method |
| CN112068737B (en) * | 2020-09-03 | 2024-02-20 | 广州华欣电子科技有限公司 | Infrared touch screen signal conditioning circuit and method |
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Application publication date: 20101124 |