CN204576468U - Be applicable to the infrared touch panel circuit of strong surround lighting - Google Patents
Be applicable to the infrared touch panel circuit of strong surround lighting Download PDFInfo
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- CN204576468U CN204576468U CN201520127763.2U CN201520127763U CN204576468U CN 204576468 U CN204576468 U CN 204576468U CN 201520127763 U CN201520127763 U CN 201520127763U CN 204576468 U CN204576468 U CN 204576468U
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- surround lighting
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Abstract
The utility model relates to a kind of infrared touch panel circuit being applicable to strong surround lighting, comprise infrared receiver sensor corresponding to multiple controlled infraluminescence source, multiple and controlled infraluminescence source and signal processing circuit thereof and master controller, described master controller is connected with controlled infraluminescence source and infrared receiver sensor and signal processing circuit thereof respectively; High-speed switch switching is carried out in the multiple controlled infraluminescence source of described main controller controls, described infrared receiver sensor and signal processing circuit thereof receive the signal of controlled infraluminescence source (1), and will carry out filtering to ambient light component in signal.Compared with prior art, the utility model have applied widely, realize that cost is low, circuit structure is simple, performance advantages of higher.
Description
Technical field
The utility model relates to a kind of infrared touch panel circuit, especially relates to a kind of infrared touch panel circuit being applicable to strong surround lighting.
Background technology
Based on the touch panel device of infrared principles, usually all adopt infrarede emitting diode as light emitting source, infrared photodiode or infrared phototriode are as receiving sensor.When having finger, pen etc. that the operation clicking screen occurs, the Infrared sent by light emitting source that receiving sensor can be made to receive occurs by the situation of partial occlusion.Touch screen controller thus can judge whether that touch operation occurs and determines the position of corresponding touch point.
In many practical application, the equipment that infrared touch panel is housed can be placed on the position of strong surround lighting direct projection, refraction or reflection.Near the position of glass curtain wall, the meeting-place having strong halogen light modulation, shot-light or studio etc. in such as outdoor, office.
Owing to having very strong infrared component in the light sources such as sunshine, halogen light modulation, receiving sensor can be had a strong impact on, often cause receiving in the interference that useful signal produces at surround lighting and cannot effectively be made a distinction, thus have influence on final result of use.For large-sized infrared touch panel, can be received the useful signal that sensor receives fainter, therefore intense laser interfere can seem more serious.This is also that infrared touch panel is all mainly used in indoor all the time, and cannot large-scale application in main cause that is outdoor or high light scene.
In order to overcome the problems referred to above, the main method used comprises at present: reduce the external ambient light that may incide receiving sensor from the frame structure of touch-screen as far as possible; Receiving sensor increases the coating of the non-Infrared of isolation; To reduce in touch-screen late-class circuit amplification to received signal, increase the intensity in touch-screen infraluminescence source; Or the outer light emitting source of modulated red etc.
But such scheme has the limitation of self, as:
The adjustment of frame structure can significantly reduce the surround lighting incided on sensor, but still has problem for the touch apparatus that a lot of special angle is put.When surround lighting is after direct projection, refraction or reflection, the sensor of impact that still can be obvious.
Although sensor increases coating effectively can intercept the non-infrared components such as visible ray, infrared component itself is not filtered.Therefore for the infrared component in surround lighting then almost without any effect.
Reduce the amplification to signal in receiving circuit, can prevent strong ambient light signal from causing the saturated of receiving end, but directly can reduce signal to noise ratio (S/N ratio) in essence.Cause the difficulty of rear class signal transacting.
Increase the intensity in infraluminescence source, effectively can improve signal to noise ratio (S/N ratio), and overcome the surround lighting of some strength.But due to the lifting of light emitting source intensity, can system power dissipation be increased considerably, and along with the increase of light emitting source luminous intensity, also can have an impact to the life-span in infraluminescence source.
Modulated infrared light source is another kind of conventional also effective method.The surround lightings such as usual sunlight are one and change DC component slowly, and after being modulated by infrared light supply, can be extracted by useful signal by the filtering circuit by comparative maturity in receiving circuit.But, if adopt high frequency modulated, generally can significantly increase system cost and design complexities.And adopt the modulation of switching mode, then need switch infrared discharge lamps repeatedly to guarantee the envelope of efficiently sampling to signal, thus the sampling period of single signal can be increased considerably, cause at large scale infrared touch panel, especially the problem that in multipoint application, sample frequency is too low, and the effect that final impact touches.
Utility model content
The purpose of this utility model be exactly in order to overcome above-mentioned prior art exist defect and provide a kind of applied widely, realize the infrared touch panel circuit being applicable to strong surround lighting that cost is low, circuit structure is simple, performance is high.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of infrared touch panel circuit being applicable to strong surround lighting, it is characterized in that, comprise infrared receiver sensor corresponding to multiple controlled infraluminescence source, multiple and controlled infraluminescence source and signal processing circuit thereof and master controller, described master controller is connected with controlled infraluminescence source and infrared receiver sensor and signal processing circuit thereof respectively;
High-speed switch switching is carried out in the multiple controlled infraluminescence source of described main controller controls, and described infrared receiver sensor and signal processing circuit thereof receive the signal in controlled infraluminescence source, and carry out filtering to surround lighting wherein.
Described controlled infraluminescence source comprises the supply module, switching over module and the infrarede emitting diode that connect successively, and described switching over module is connected with master controller;
Described supply module, by the input power of touch-screen by voltage-current converter circuit, converts the power supply of Direct driver infrarede emitting diode to;
Described switching over module, the control of main controller, controls opening fast or closing of infrarede emitting diode.
Described switching over module comprises P-MOSFET and N-MOSFET be connected with master controller respectively, and described master controller opens P-MOSFET and N-MOSFET by control signal, and described infrarede emitting diode switches on power, opens luminescence; After as P-MOSFET and N-MOSFET, any one is closed, described infrarede emitting diode deenergization, stopping luminescence.
Described infrared receiver sensor and signal processing circuit thereof comprise the infrared receiver sensor, first order signal amplification circuit and the second level signal amplification circuit that connect successively;
The output of described infrared receiver sensor is connected to the input of first order signal amplification circuit, the output of described first order signal amplification circuit is connected to the input of second level signal amplification circuit, and the output of described second level signal amplification circuit is connected to master controller.
Described infrared receiver sensor comprises the infrared photodiode and resistance of connecting successively.
It is the first amplifier amplifying circuit of forming of core and the first gain configuration circuit that described first order signal amplification circuit comprises by the first operational amplifier.
The first described operational amplifier is noise high-speed track to track input/output operation amplifier.
Described second level signal amplification circuit comprises electric capacity, be the amplifier amplifying circuit that forms of core and the second gain configuration circuit by the second operational amplifier, described capacitances in series is between the output and the input of the second operational amplifier of first order signal amplification circuit.
The second described operational amplifier is low maladjustment voltage track to track input/output operation amplifier.
Described master controller comprises comparator circuit, analog to digital conversion circuit, single-chip microcomputer and master controller power pack, described comparator circuit is connected with the output of second level signal amplifier respectively with the input of analog to digital conversion circuit, described comparator circuit, the output of analog to digital conversion circuit are connected with single-chip microcomputer respectively, and described master controller power pack is connected with comparator circuit, analog to digital conversion circuit, single-chip microcomputer respectively.
Compared with prior art, the utility model has the following advantages:
1) improve usable range, the application of infrared touch panel in outdoor and strong surround lighting occasion can be realized.
2) realize cost low, only need just can realize, to the filtration of ambient light component strong infrared induction signal, not relying on the structural design of touch-screen from circuit design, and for the position of touch-screen placement and angle in practical application.
3) performance is good, deposits in case at strong surround lighting, still keeps almost identical signal to noise ratio (S/N ratio).
4) deposit in case at strong surround lighting, do not need the power increasing infraluminescence source, reduce power consumption, extend mission life.
5) circuit structure is fairly simple, realizes cost compare low.
6) sampling period that infrared touch panel keeps shorter can be made, improve the sweep frequency of infrared touch panel, especially large scale infrared touch panel, improve performance.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the structural representation in the controlled infraluminescence source of the utility model;
Fig. 3 is the structural representation of the utility model infrared receiver sensor and signal processing circuit thereof;
Fig. 4 is the structural representation of the utility model master controller;
Fig. 5 is the structural representation of the utility model switching over module;
Fig. 6 is the structural representation of the utility model second level signal amplification circuit.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.
Embodiment
As shown in Figure 1, the infrared touch panel circuit that can work under a kind of strong surround lighting, is made up of multiple controlled infraluminescence source 1, multiple infrared receiver sensor and signal processing circuit 2 thereof and master controller 3.
As shown in Figure 2, above-mentioned controlled infraluminescence source, is made up of supply module 11, switching over module 12 and infrarede emitting diode 13.
Above-mentioned supply module 11, by the input power of touch-screen by conventional voltage-current converter circuit, converting to can the power supply of Direct driver infrarede emitting diode 13.
Above-mentioned switching over module 12, the control of main controller 3, controls opening fast or closing of infrarede emitting diode 13.Generally can be realized by the power supply of fast shut-off or conducting infrarede emitting diode 13, thus produce single or multiple pulsed optical signals.
As shown in Figure 3, above-mentioned infrared receiver sensor and signal processing circuit 2 thereof, be made up of infrared receiver sensor 21, first order signal amplification circuit 22, second level signal amplification circuit 23.
The output signal of infrared receiver sensor 21 is connected to the input of first order signal amplification circuit 22, and the output of first order signal amplification circuit 22 is connected to the input of second level signal amplification circuit 23.The output of second level signal amplification circuit 23, is connected to master controller 3.
Above-mentioned infrared receiver sensor 21, is composed in series by infrared photodiode 21a and resistance 21b.Usual infrared photodiode can choose the universal product that diameter is 3MM or 5MM specification; Resistance 21b can choose between 1K ~ 100K.
Above-mentioned first order signal amplification circuit 22 is that amplifier amplifying circuit, the gain configuration circuit that core is formed forms by operational amplifier 22a.
Above-mentioned operational amplifier 22a, selects noise high-speed track to track input/output operation amplifier.
Above-mentioned amplifier amplifying circuit, selects ripe direct proportion or inverse proportion voltage amplifier circuit to realize, and infrared receiver sensor 21 is transmitted the signal of coming in and amplifies according to the gain configuration of gain configuration circuit.
Above-mentioned gain configuration circuit, can be integrated in operational amplifier 22a, also can independently in the outside gain carrying out controlling and adjustment first order signal amplification circuit 22 as external circuit of operational amplifier 22a.Usual gain margin is between 5 ~ 100 times.
Above-mentioned second level signal amplification circuit 23 is that amplifier amplifying circuit 23c, the gain configuration circuit that core is formed forms by electric capacity 23a, operational amplifier 23b.
Above-mentioned electric capacity 23a, usually select common MLCC electric capacity, capacitance is between 100pF ~ 100nF.Be connected between the output of first order signal amplification circuit 22 and the input of operational amplifier 23b.
Above-mentioned operational amplifier 23b, selects low maladjustment voltage track to track input/output operation amplifier.
Above-mentioned amplifier amplifying circuit 23c, selects ripe direct proportion or inverse proportion amplifying circuit to realize, and the gain configuration that the signal after electric capacity 23a is formed according to gain configuration circuit is amplified.
Above-mentioned gain configuration circuit, can be integrated in operational amplifier 23b, also can independently in the outside gain carrying out controlling and adjustment second level signal amplification circuit 23 as external circuit of operational amplifier 23b.
As shown in Figure 4, above-mentioned master controller 3, is made up of comparator circuit 3a, analog to digital conversion circuit 3b, high performance universal single-chip microcomputer 3c, master controller power pack 3d.
Above-mentioned comparator circuit 3a and analog to digital conversion circuit 3b, is connected to the output of second level signal amplifier 23 and the centre of high performance universal single-chip microcomputer 3c.In practical application, can use wherein any one, or combination two circuit use together.
Above-mentioned comparator circuit 3a can be integrated in high performance universal single-chip microcomputer 3c, also can be independently outside at 3c.The function of comparator circuit 3a is compared the output signal of second level signal amplifier 23 and default threshold value, judges whether to exceed threshold value, and judged result is sent to high performance universal single-chip microcomputer 3c.
Above-mentioned analog to digital conversion circuit 3b, can be integrated in high performance universal single-chip microcomputer 3c, also can be independently outside at 3c.The function of analog to digital conversion circuit 3b is that the output signal of second level signal amplifier 23 is carried out analog to digital conversion, and the numerical information after conversion is sent in high performance universal single-chip microcomputer 3c.
Above-mentioned high performance universal single-chip microcomputer 3c, can adopt work dominant frequency at more than 50MHz general single chip usually.High performance universal single-chip microcomputer 3c control multiple controlled infrared emitter 1 open closedown fast, process the digital signal through comparator circuit 3a, analog to digital conversion circuit 3b, through the touch-screen detection algorithm of setting, send touch information to host computer by communication interface.
Above-mentioned master controller power pack 3d, by the input power of touch-screen by conventional voltage-current converter circuit, is adjusted to the power supply that can be driven directly comparator circuit 3a, analog to digital conversion circuit 3b, high performance universal single-chip microcomputer 3c.
The infrared touch panel circuit that can work under described strong surround lighting, its principle of work is as follows:
The switching over module 12 in multiple controlled infraluminescence source 1, under the control of high performance universal single-chip microcomputer 3c, carries out high-speed switch switching.When switch opens time, connect infrarede emitting diode 13 and supply module 11, open a bit of time, after 1 ~ 10us, closing switch.Single like this or circulation repeatedly, thus make infrarede emitting diode 13 can send single or multiple light pulse.
Fig. 5 is a kind of circuit realiration of typical switching over module 12.P-MOSFET 12a and N-MOSFET12b forms switching over module, is connected between supply module 11 and infrarede emitting diode 13, and is subject to the control of main control 3.When main control 3 opens P-MOSFET 12a and N-MOSFET12b two MOSFET by control signal, infrarede emitting diode 13 switches on power, opens luminescence.After as P-MOSFET 12a and N-MOSFET12b, any one is closed, infrarede emitting diode 13 deenergization, stopping luminescence.
Owing to adopting infrarede emitting diode 21, with the difference of the infrared light intensity in outside, its photocurrent produced can be general within the scope of 1uA ~ 1mA.After selecting suitable series resistor 21b, generally can produce the voltage signal of 10mV ~ 1V scope.Under strong surround lighting, as direct sunlight in summer, although the photocurrent produced significantly can exceed the photocurrent that useful signal produces, due to the restriction of infrared photodiode 21 self character, usually also can not exceed within the scope of above-mentioned photocurrent.
After the light pulse signal that infrared receiver sensor 21 receives amplifies by first order signal amplification circuit 22, then be conveyed into second level signal circuit 23.Because 22a selects noise high-speed track to track input/output operation amplifier, therefore, it is possible to effectively control signal to noise ratio (S/N ratio).When not having infrared light to respond to, 22a has the performance that track to track exports, and can ensure to export the signal close to 0V, can not produce the background noise signal of interference.
Signal 6a after the amplification of first order amplifier circuit 22 needs by entering second level amplifier amplifying circuit after electric capacity 23a again, therefore the DC component in 6a can to keeping apart, and effective pulse signal 6b then can be coupled in the amplifier amplifying circuit of the second level by electric capacity 23a smoothly.Due to the DC component that most ambient light signal is all slowly changes, therefore after foregoing circuit process, the surround lighting of the overwhelming majority all can by filtering from original signal.
Fig. 6 is the realization of a typical second level signal amplification circuit 23, adopts direct proportion amplifier amplifying circuit.
Signal after electric capacity 23a amplifies by second level amplifier amplifying circuit 23c.Because 23b selects low maladjustment voltage track to track input/output operation amplifier, therefore after amplifying, the gain error caused due to the offset voltage of amplifier own is very little.When not having infrared light to respond to, 23b has the performance that track to track exports, and can ensure to export the signal close to 0V, can not produce the background noise signal of interference.
Signal after second level signal amplification circuit 23 amplifies, after comparator circuit 3a or analog to digital conversion circuit 3b or both combinations, enters high performance universal single-chip microcomputer 3c.Now operate in the algorithm routine in high performance universal single-chip microcomputer, after the single or multiple Infrared pulses only needing the controlled infraluminescence source 1 controlled at it to send, detect after certain delay and whether receive pulse signal.According to whether pulse being detected, judge the object whether occurring blocking in corresponding light path, and send touch situation to host computer through communication interface after processing further.
Claims (10)
1. one kind is applicable to the infrared touch panel circuit of strong surround lighting, it is characterized in that, comprise infrared receiver sensor corresponding to multiple controlled infraluminescence source (1), multiple and controlled infraluminescence source and signal processing circuit (2) thereof and master controller (3), described master controller (3) is connected with controlled infraluminescence source (1) and infrared receiver sensor and signal processing circuit (2) thereof respectively.
2. a kind of infrared touch panel circuit being applicable to strong surround lighting according to claim 1, it is characterized in that, described controlled infraluminescence source (1) comprises the supply module (11), switching over module (12) and the infrarede emitting diode (13) that connect successively, and described switching over module (12) is connected with master controller (3).
3. a kind of infrared touch panel circuit being applicable to strong surround lighting according to claim 2, it is characterized in that, described switching over module (12) comprises the P-MOSFET (12a) and N-MOSFET (12b) that are connected with master controller (3) respectively.
4. a kind of infrared touch panel circuit being applicable to strong surround lighting according to claim 1, it is characterized in that, described infrared receiver sensor and signal processing circuit (2) thereof comprise the infrared receiver sensor (21), first order signal amplification circuit (22) and the second level signal amplification circuit (23) that connect successively;
The output of described infrared receiver sensor (21) is connected to the input of first order signal amplification circuit (22), the output of described first order signal amplification circuit (22) is connected to the input of second level signal amplification circuit (23), and the output of described second level signal amplification circuit (23) is connected to master controller (3).
5. a kind of infrared touch panel circuit being applicable to strong surround lighting according to claim 4, it is characterized in that, described infrared receiver sensor (21) comprises the infrared photodiode (21a) and resistance (21b) of connecting successively.
6. a kind of infrared touch panel circuit being applicable to strong surround lighting according to claim 4, it is characterized in that, described first order signal amplification circuit (22) comprises the first amplifier amplifying circuit and the first gain configuration circuit that are made up of for core the first operational amplifier (22a).
7. a kind of infrared touch panel circuit being applicable to strong surround lighting according to claim 6, is characterized in that, described the first operational amplifier (22a) is noise high-speed track to track input/output operation amplifier.
8. a kind of infrared touch panel circuit being applicable to strong surround lighting according to claim 4, it is characterized in that, described second level signal amplification circuit (23) comprises electric capacity (23a), the amplifier amplifying circuit (23c) be made up of for core the second operational amplifier (23b) and the second gain configuration circuit, and described electric capacity (23a) is connected between the output of first order signal amplification circuit (22) and the input of the second operational amplifier (23b).
9. a kind of infrared touch panel circuit being applicable to strong surround lighting according to claim 8, is characterized in that, described the second operational amplifier (23b) is low maladjustment voltage track to track input/output operation amplifier.
10. a kind of infrared touch panel circuit being applicable to strong surround lighting according to claim 4, it is characterized in that, described master controller (3) comprises comparator circuit (3a), analog to digital conversion circuit (3b), single-chip microcomputer (3c) and master controller power pack (3d), described comparator circuit (3a) is connected with the output of second level signal amplifier (23) respectively with the input of analog to digital conversion circuit (3b), described comparator circuit (3a), the output of analog to digital conversion circuit (3b) is connected with single-chip microcomputer (3c) respectively, described master controller power pack (3d) respectively with comparator circuit (3a), analog to digital conversion circuit (3b), single-chip microcomputer (3c) connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520127763.2U CN204576468U (en) | 2015-03-05 | 2015-03-05 | Be applicable to the infrared touch panel circuit of strong surround lighting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520127763.2U CN204576468U (en) | 2015-03-05 | 2015-03-05 | Be applicable to the infrared touch panel circuit of strong surround lighting |
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| CN204576468U true CN204576468U (en) | 2015-08-19 |
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| CN201520127763.2U Expired - Fee Related CN204576468U (en) | 2015-03-05 | 2015-03-05 | Be applicable to the infrared touch panel circuit of strong surround lighting |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2015
- 2015-03-05 CN CN201520127763.2U patent/CN204576468U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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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 |
Granted publication date: 20150819 |
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| CF01 | Termination of patent right due to non-payment of annual fee |