CN203405795U - Receiving and transmitting circuit of infrared touch screen and infrared touch screen - Google Patents
Receiving and transmitting circuit of infrared touch screen and infrared touch screen Download PDFInfo
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- CN203405795U CN203405795U CN201320500753.XU CN201320500753U CN203405795U CN 203405795 U CN203405795 U CN 203405795U CN 201320500753 U CN201320500753 U CN 201320500753U CN 203405795 U CN203405795 U CN 203405795U
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Abstract
The utility model discloses a receiving and transmitting circuit of an infrared touch screen and an infrared touch screen. The receiving and transmitting circuit of the infrared touch screen is connected with an MCU of the infrared touch screen and comprises an infrared transmitter module and an infrared receiving module. The infrared transmitter module comprises a modulating signal input end and is used for receiving a modulating signal and modulating an infrared signal generated by the infrared transmitter module, and the infrared transmitter module outputs the modulated infrared signal to the infrared receiving module. The infrared receiving module comprises a demodulation circuit, the infrared receiving module converts the received infrared signal into a voltage signal, demodulating is performed on the voltage signal through the demodulation circuit, and the demodulated voltage signal is output to the MCU of the infrared touch screen. The modulated infrared signal is output by the infrared transmitter module and output to the MCU of the infrared touch screen to be identified after being demodulated by the infrared receiving module, so that an infrared jamming signal is effectively blocked, and the anti-interference performance of the receiving and transmitting circuit of the infrared touch screen is improved.
Description
Technical field
The utility model relates to infrared touch panel technical field, particularly the transmission circuit of infrared touch panel and infrared touch panel.
Background technology
Infrared touch panel, in touch-screen surrounding, densely covered infrared transmitting tube and infrared receiving tube, form the corresponding infrared tube matrix distributing anyhow respectively, forms infrared ray grating, user is when touch screen, when finger enters grating, blocked two infrared beams anyhow through this position, thereby can change by scouting the loss of light, judge X-axis and the Y-axis coordinate figure of touch point on screen, to locate touch point.
In the transmitting-receiving application circuit of infrared touch panel, by infrared transmitting tube, send a branch of infrared emission signal to infrared receiving tube, infrared receiving tube is converted to electric signal by the light signal sensing, and after amplifying circuit amplifies suitable intensity, deliver to the A/D conversion input end of MCU, MCU, by identification electrical signal intensity, judges whether infrared touch panel is touched.But traditional infrared touch panel transmission circuit is very easy to be subject to the interference of external infrared signal, the signal sending such as Infrared remote controller or environmental interference signal etc., easily cause the misoperation of infrared touch panel, poor anti jamming capability.
Utility model content
Fundamental purpose of the present utility model, for a kind of transmission circuit and infrared touch panel of infrared touch panel are provided, can effectively strengthen the antijamming capability of infrared touch panel.
The utility model proposes a kind of transmission circuit of infrared touch panel, be connected with the MCU of infrared touch panel, comprise infrared transmission module and infrared receiving module, described infrared transmission module comprises modulation signal input end, be used for receiving modulation signal, the infrared signal that described infrared transmission module is generated is modulated, infrared signal after described infrared transmission module output modulation is to described infrared receiving module, described infrared receiving module comprises demodulator circuit, described infrared receiving module is converted to voltage signal by the infrared signal receiving, and adopt demodulator circuit to described voltage signal demodulation, voltage signal after demodulation is exported to the MCU of described infrared touch panel.
Preferably, described infrared transmission module comprises that control signal produces circuit and infrared transmitting circuit, described control signal produces circuit and comprises described modulation signal input end, receive described modulation signal, described control signal produces circuit and adopts described modulation signal to modulate the control signal generating; The control output end of described control signal generation circuit connects the control end of described infrared transmitting circuit, after output modulation, control signal to described infrared transmitting circuit, control infrared signal after the transmitting terminal output modulation of described infrared transmitting circuit to described infrared receiving module.
Preferably, described infrared receiving module also comprises infrared receiving circuit and signal amplification circuit, described demodulator circuit is Sampling Integral circuit, the receiving end of described infrared receiving circuit receives the infrared signal after the described modulation of described infrared transmission module output, infrared signal after described modulation is converted to voltage signal, the signal output part of described infrared receiving circuit connects the signal input part of described signal amplification circuit, export described voltage signal to described signal amplification circuit, described signal amplification circuit amplifies and processes described voltage signal, the signal output part of described signal amplification circuit connects the signal input part of described demodulator circuit, voltage signal after output is amplified is to described demodulator circuit, described demodulator circuit is to the voltage signal demodulation after amplifying, the signal output part of described demodulator circuit connects the A/D conversion input end of described MCU, voltage signal after output demodulation is to described MCU.
Preferably, described control signal produces circuit and comprises code translator, the first Enable Pin of described code translator receives driving voltage, the second Enable Pin of described code translator produces the modulation signal input end of circuit as described control signal, receive described modulation signal, described code translator generates the control signal after modulation according to the output frequency of described modulation signal, the control output end of described code translator connects the control end of described infrared transmitting circuit, the control end that controls signal to described infrared transmitting circuit after output modulation.
Preferably, described the first Enable Pin is that high level is effective, and described the second Enable Pin is Low level effective, and described code translator generates the control signal after modulation according to the low level output frequency of described modulation signal.
Preferably, described demodulator circuit comprises the first diode, the second diode, the first resistance, the second resistance, the 3rd resistance, the first electric capacity and the second electric capacity, the signal output part of amplifying circuit described in the anodic bonding of described the first diode, the negative electrode of described the first diode is through the first resistance eutral grounding, the negative electrode of described the first diode also connects the anode of described the second diode, the negative electrode of described the second diode connects the A/D conversion input end of described MCU through the second resistance, described the 3rd resistance, after the first electric capacity and the second Capacitance parallel connection, one end is connected with described A/D conversion input end, other end ground connection.
The utility model also proposes a kind of infrared touch panel, the transmission circuit that comprises MCU and infrared touch panel, the transmission circuit of described infrared touch panel is connected with the MCU of infrared touch panel, comprise infrared transmission module and infrared receiving module, described infrared transmission module comprises modulation signal input end, be used for receiving modulation signal, the infrared signal that described infrared transmission module is generated is modulated, infrared signal after described infrared transmission module output modulation is to described infrared receiving module, described infrared receiving module comprises demodulator circuit, described infrared receiving module is converted to voltage signal by the infrared signal receiving, and adopt described demodulator circuit to described voltage signal demodulation, voltage signal after demodulation is exported to the MCU of described infrared touch panel.
The utility model is exported the infrared signal after modulation signal modulation by infrared transmission module, after infrared receiving module demodulation, export MCU identification to, can effectively intercept infrared undesired signal, improved the anti-interference of the transmission circuit of infrared touch panel, solved infrared touch panel and be easily subject to the problem that external infrared signal is disturbed.
Accompanying drawing explanation
Fig. 1 is the structural representation of the transmission circuit of infrared touch panel in the utility model embodiment;
Fig. 2 is the circuit structure diagram that in the transmission circuit of infrared touch panel of the utility model embodiment, control signal produces circuit;
Fig. 3 is the circuit structure diagram of demodulator circuit in the transmission circuit of infrared touch panel of the utility model embodiment.
The realization of the utility model object, functional characteristics and advantage, in connection with embodiment, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figure 1, Fig. 1 is the structural representation of the transmission circuit of infrared touch panel in the utility model embodiment, the transmission circuit 100 of the infrared touch panel that the present embodiment proposes, be connected with the MCU200 of infrared touch panel, the transmission circuit 100 of infrared touch panel comprises infrared transmission module 110 and infrared receiving module 120, infrared transmission module 110 comprises modulation signal input end, and infrared receiving module 120 comprises demodulator circuit 121.Infrared transmission module 110 receives modulation signal through modulation signal input end, the infrared signal that infrared transmission module 110 is generated is modulated, infrared signal after infrared transmission module 110 output modulation is to infrared receiving module 120, infrared receiving module 120 is converted to voltage signal by the infrared signal receiving, and adopt 121 pairs of voltage signal demodulation of demodulator circuit, the voltage signal after demodulation is exported to the MCU200 of infrared touch panel.
Further, infrared transmission module 110 comprises that control signal produces circuit 111 and infrared transmitting circuit 112, control signal produces circuit 111 and comprises modulation signal input end, and control signal produces the control end of the control output end connection infrared transmitting circuit 112 of circuit 111.Control signal produces circuit 111 and receives modulation signal through modulation signal input end, adopts modulation signal to modulate the control signal generating, and makes the frequency of control signal and the frequency of modulation signal consistent.Control signal produces and to control signal to infrared transmitting circuit 112 after circuit 111 output modulation, the frequency of infrared signal and the frequency of control signal that the transmitting terminal of infrared transmitting circuit 112 is produced are consistent, the modulation of realization to infrared signal, the infrared signal after the transmitting terminal output modulation of infrared transmitting circuit 112 is to infrared receiving module 120.
The demodulator circuit 121 of infrared receiving module 120 is Sampling Integral circuit, infrared receiving module 120 also comprises infrared receiving circuit 122 and signal amplification circuit 123, the receiving end of infrared receiving circuit 122 is corresponding with the transmitting terminal of infrared transmission module 110, the signal output part of infrared receiving circuit 122 connects the signal input part of signal amplification circuit 123, the signal output part of signal amplification circuit 123 connects the signal input part of demodulator circuit 121, and the signal output part of demodulator circuit 121 connects the A/D conversion input end of MCU200.Infrared signal after the modulation of infrared receiving circuit 122 reception infrared transmission module 110 outputs, may also have the infrared undesired signal that other equipment send, infrared receiving circuit 122 is converted to voltage signal by the infrared undesired signal of the infrared signal after the modulation of infrared transmission module 110 outputs and the transmission of other equipment, and output voltage signal to signal amplification circuit 123, 123 pairs of voltage signals of signal amplification circuit amplify to be processed, and the voltage signal after output amplification is to demodulator circuit 121, voltage signal demodulation after 121 pairs of amplifications of demodulator circuit, demodulator circuit 121 carries out demodulation mainly for the frequency of modulation signal, now, because infrared undesired signal frequency is not in the frequency range of modulation signal, therefore separating timing, infrared undesired signal is filtered, voltage signal after demodulation has only included the corresponding voltage signal of infrared signal of infrared transmission module 110 outputs, voltage signal after demodulator circuit 121 output demodulation is to MCU200, the interference of the infrared undesired signal of effectively having avoided other equipment outputs to MCU200.
The infrared transmission module 110 of the present embodiment can adopt existing infrared transmission module structure, by adding the modulation signal of, the infrared signal of infrared transmission module 110 outputs is modulated.Wherein, the frequency of modulation signal includes but not limited to 200KHz, it is example that the present embodiment be take the modulation signal of 200KHz, the infrared signal of infrared transmission module 110 output the has been modulated infrared modulation signal of 200KHz frequency, 121 pairs of infrared modulation signals of demodulator circuit demodulation by infrared receiving module 120, is reduced to voltage signal by infrared modulation signal, then voltage signal is delivered to the AD modular converter of MCU, identify infrared touch panel and whether be touched, and touch point, location.Because the infrared signal in transmission between infrared transmission module 110 and infrared receiving module 120 is the infrared modulation signal after the modulation of 200KHz modulation signal, therefore, for the Infrared remote controller occurring once in a while or environmental interference signal etc., not in the infrared signal frequency range after modulation, can be by the demodulator circuit 121 in infrared receiving module 120 to intercepting, effectively improved the anti-interference of the transmission circuit 100 of infrared touch panel, solved infrared touch panel and be easily subject to the problem that external infrared signal is disturbed.
As shown in Figures 2 and 3, Fig. 2 is the circuit structure diagram that in the transmission circuit of infrared touch panel of the utility model embodiment, control signal produces circuit, and Fig. 3 is the circuit structure diagram of demodulator circuit in the transmission circuit of infrared touch panel of the utility model embodiment.
With reference to Fig. 2, in the present embodiment, control signal produces circuit and comprises code translator U, and the Strobe input of address strobe end R0, the R1 of code translator U, R2 link address gating chip is realized the gating to each control output end Y0～Y7 in U.Because infrared tube matrix is at touch-screen surrounding correspondence distributes anyhow respectively infrared transmitting tube and infrared receiving tube, therefore, code translator U adopts two conventionally, respectively horizontal and vertical infrared transmitting tube is controlled.Each control output end of code translator U connects respectively control end corresponding in infrared transmitting circuit, code translator U comprises three Enable Pins, the first Enable Pin G1 receives driving voltage VCC, two the second Enable Pin G2A and G2B produce the modulation signal input end of circuit as control signal, receive 200KHz modulation signal, code translator U generates the control signal after modulation according to the output frequency of modulation signal, and the frequency of control signal is consistent with the frequency of modulation signal.The first Enable Pin G1 of the present embodiment is that high level is effective, and driving voltage VCC inputs to the first Enable Pin G1, and the first Enable Pin G1 is set high.Two the second Enable Pin G2A and G2B are Low level effective, when the low level of the modulation signal of 200KHz arrives G2A and G2B, the control output end output control end that control signal to corresponding infrared transmitting circuit consistent with frequency modulating signal being strobed, controls infrared transmitting tube corresponding in infrared transmitting circuit luminous.Because code translator U generates the control signal after modulation according to the low level output frequency of modulation signal, therefore, infraluminescence pipe also, along with the low level output frequency scintillation of modulation signal, is exported the infrared signal after modulation, and the infrared signal frequency after modulation is consistent with frequency modulating signal.
The infrared transmission module of the present embodiment on hardware without increasing new circuit structure, only need to be at the Enable Pin input modulating signal of code translator, by modulation signal, realize control signal output frequency is regulated, make control signal frequency consistent with frequency modulating signal, control signal after employing modulation is controlled conducting and the cut-off of infraluminescence pipe, regulate the glow frequency of infrared transmitting tube, and then the output infrared signal consistent with frequency modulating signal, realize the modulation to infrared signal.
With reference to Fig. 3, the demodulator circuit of the present embodiment comprises the first diode D1, the second diode D2, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the first capacitor C 1 and the second capacitor C 2, the signal output part S1 of the anodic bonding amplifying circuit of the first diode D1, the negative electrode of the first diode D1 is through the first resistance R 1 ground connection, the negative electrode of the first diode D1 also connects the anode of the second diode D2, the negative electrode of the second diode D2 connects the A/D conversion input end S2 of MCU through the second resistance R 2, the 3rd resistance R 3, after the first capacitor C 1 and the second capacitor C 2 parallel connections, one end is connected with A/D conversion input end S2, other end ground connection.The demodulator circuit of the present embodiment, by the first diode D1, the second diode D2, the first resistance R 1, the sampling door circuit that the second resistance R 2 forms, when the voltage signal consistent with frequency modulating signal arrives, the first diode D1 and the second diode D2 high speed conducting, this voltage signal consistent with frequency modulating signal is passed through, during frequency modulating signal gap, the first diode D1 and the second diode D2 cut-off, clutter in voltage signal (voltage signal being converted by infrared undesired signal) cannot drive D1 and D2, can the clutter in voltage signal be filtered.Wherein, the first diode D1, the second diode D2 can be schottky diode, and the 3rd resistance R 3 is as dividing potential drop branch road.Voltage signal after filtration is loaded in the first capacitor C 1 and the second capacitor C 2 gradually, to the first capacitor C 1 and the second capacitor C 2 chargings, after N charging, voltage on C1 and C2 increases gradually, formation is by weak extremely strong voltage signal, this voltage signal is sent to the A/D conversion input end S2 of MCU, by MCU, it is carried out to A/D conversion and sampling processing.
The present embodiment has increased a demodulator circuit as demodulator circuit on infrared receiving module, and circuit structure is simple, is conducive to reduce circuit cost.Because the infrared signal receiving is the infrared modulation signal after ovennodulation, for the Infrared remote controller occurring once in a while or environmental interference signal etc., can to obstruct, fall by demodulated circuit, effectively improved the anti-interference of the transmission circuit of infrared touch panel, solved infrared touch panel and be easily subject to the problem that external infrared signal is disturbed.
The utility model embodiment also proposes a kind of infrared touch panel, the transmission circuit that comprises MCU and infrared touch panel, the transmission circuit of infrared touch panel is connected with the MCU of infrared touch panel, comprise infrared transmission module and infrared receiving module, infrared transmission module comprises modulation signal input end, receive modulation signal, and the infrared signal after output modulation is to infrared receiving module, infrared receiving module comprises demodulator circuit, infrared receiving module is converted to voltage signal by the infrared signal receiving, and adopt demodulator circuit to voltage signal demodulation, voltage signal after demodulation is exported to the MCU of infrared touch panel.
The transmission circuit of the infrared touch panel that the infrared touch panel in the present embodiment comprises, can contain Fig. 1 to all technical schemes in embodiment illustrated in fig. 3, and its concrete structure and principle of work can be with reference to above-described embodiments, and therefore not to repeat here.Owing to having adopted the transmission circuit of the infrared touch panel in above-described embodiment, infrared touch panel in the present embodiment is compared to traditional infrared touch panel, antijamming capability is stronger, efficiently solves infrared touch panel and is easily subject to the problem that external infrared signal is disturbed.
The foregoing is only preferred embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model instructions and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (7)
1. the transmission circuit of an infrared touch panel, be connected with the MCU of infrared touch panel, it is characterized in that, comprise infrared transmission module and infrared receiving module, described infrared transmission module comprises modulation signal input end, be used for receiving modulation signal, the infrared signal that described infrared transmission module is generated is modulated, infrared signal after described infrared transmission module output modulation is to described infrared receiving module, described infrared receiving module comprises demodulator circuit, described infrared receiving module is converted to voltage signal by the infrared signal receiving, and adopt described demodulator circuit to described voltage signal demodulation, voltage signal after demodulation is exported to the MCU of described infrared touch panel.
2. the transmission circuit of infrared touch panel according to claim 1, it is characterized in that, described infrared transmission module comprises that control signal produces circuit and infrared transmitting circuit, described control signal produces circuit and comprises described modulation signal input end, receive described modulation signal, described control signal produces circuit and adopts described modulation signal to modulate the control signal generating; The control output end of described control signal generation circuit connects the control end of described infrared transmitting circuit, after output modulation, control signal to described infrared transmitting circuit, control infrared signal after the transmitting terminal output modulation of described infrared transmitting circuit to described infrared receiving module.
3. the transmission circuit of infrared touch panel according to claim 2, it is characterized in that, described infrared receiving module also comprises infrared receiving circuit and signal amplification circuit, described demodulator circuit is Sampling Integral circuit, the receiving end of described infrared receiving circuit receives the infrared signal after the described modulation of described infrared transmission module output, infrared signal after described modulation is converted to voltage signal, the signal output part of described infrared receiving circuit connects the signal input part of described signal amplification circuit, export described voltage signal to described signal amplification circuit, described signal amplification circuit amplifies and processes described voltage signal, the signal output part of described signal amplification circuit connects the signal input part of described demodulator circuit, voltage signal after output is amplified is to described demodulator circuit, described demodulator circuit is to the voltage signal demodulation after amplifying, the signal output part of described demodulator circuit connects the A/D conversion input end of described MCU, voltage signal after output demodulation is to described MCU.
4. the transmission circuit of infrared touch panel according to claim 3, it is characterized in that, described control signal produces circuit and comprises code translator, the first Enable Pin of described code translator receives driving voltage, the second Enable Pin of described code translator produces the modulation signal input end of circuit as described control signal, receive described modulation signal, described code translator generates the control signal after modulation according to the output frequency of described modulation signal, the control output end of described code translator connects the control end of described infrared transmitting circuit, the control end that controls signal to described infrared transmitting circuit after output modulation.
5. the transmission circuit of infrared touch panel according to claim 4, it is characterized in that, described the first Enable Pin is that high level is effective, and described the second Enable Pin is Low level effective, and described code translator generates the control signal after modulation according to the low level output frequency of described modulation signal.
6. according to the transmission circuit of the infrared touch panel described in claim 4 or 5, it is characterized in that, described demodulator circuit comprises the first diode, the second diode, the first resistance, the second resistance, the 3rd resistance, the first electric capacity and the second electric capacity, the signal output part of amplifying circuit described in the anodic bonding of described the first diode, the negative electrode of described the first diode is through the first resistance eutral grounding, the negative electrode of described the first diode also connects the anode of described the second diode, the negative electrode of described the second diode connects the A/D conversion input end of described MCU through the second resistance, described the 3rd resistance, after the first electric capacity and the second Capacitance parallel connection, one end is connected with described A/D conversion input end, other end ground connection.
7. an infrared touch panel, comprises MCU, it is characterized in that, also comprises the transmission circuit of the infrared touch panel as described in claim 1 to 6 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320500753.XU CN203405795U (en) | 2013-08-15 | 2013-08-15 | Receiving and transmitting circuit of infrared touch screen and infrared touch screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320500753.XU CN203405795U (en) | 2013-08-15 | 2013-08-15 | Receiving and transmitting circuit of infrared touch screen and infrared touch screen |
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| CN203405795U true CN203405795U (en) | 2014-01-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320500753.XU Expired - Fee Related CN203405795U (en) | 2013-08-15 | 2013-08-15 | Receiving and transmitting circuit of infrared touch screen and infrared touch screen |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106030480A (en) * | 2014-03-28 | 2016-10-12 | 英特尔公司 | Data transmission for touchscreen displays |
| CN114584218A (en) * | 2022-02-17 | 2022-06-03 | 宁波市埃美仪表制造有限公司 | Low-power-consumption infrared communication circuit and method thereof |
-
2013
- 2013-08-15 CN CN201320500753.XU patent/CN203405795U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106030480A (en) * | 2014-03-28 | 2016-10-12 | 英特尔公司 | Data transmission for touchscreen displays |
| CN106030480B (en) * | 2014-03-28 | 2019-07-16 | 英特尔公司 | The data transmission of touch-screen display |
| CN114584218A (en) * | 2022-02-17 | 2022-06-03 | 宁波市埃美仪表制造有限公司 | Low-power-consumption infrared communication circuit and method thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140122 Termination date: 20210815 |