CN102736799A - Infrared touch screen driven by constant current source and constant current source driving circuit - Google Patents
Infrared touch screen driven by constant current source and constant current source driving circuit Download PDFInfo
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- CN102736799A CN102736799A CN2012101996129A CN201210199612A CN102736799A CN 102736799 A CN102736799 A CN 102736799A CN 2012101996129 A CN2012101996129 A CN 2012101996129A CN 201210199612 A CN201210199612 A CN 201210199612A CN 102736799 A CN102736799 A CN 102736799A
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Abstract
The invention provides an infrared touch screen driven by a constant current source and a constant current source driving circuit. An infrared transmitting tube driving circuit is the constant current source driving circuit. The constant current source driving circuit comprises a comparator, a current regulation tube, a resistor R1 and a resistor R2, wherein the non-inverting input end of the comparator inputs a given voltage value, the inverting input end of the comparator is connected between the first end of the current regulation tube and the resistor R1, and the output end of the comparator is connected to the second end of the current regulation tube through the resistor R2; the other end of the resistor R1 is connected to the positive voltage end of the comparator; and the third end of the current regulation tube M1 is connected to a load which is an infrared transmitting tube driven by the current regulation tube M1. The infrared touch screen and the constant current source driving circuit have the advantages that the constant current source is used for driving the infrared transmitting tube of the infrared touch screen, so that the infrared transmitting tube can realize stable infrared signal radiation, the radiation intensity of the infrared transmitting tube can be regulated according to needs, the stability and reliability of the infrared touch screen can further be improved, and the service life of the infrared touch screen is prolonged.
Description
Technical field
The present invention relates to infrared touching device and driving circuit thereof, relate in particular to a kind of infrared touching device and driving circuit thereof that adopts constant current source to drive infrared transmitting tube.
Background technology
It is good that the infrared touch panel technology has the linearity, supports advantages such as range of size is big.Infrared touch panel can touch with finger, pen or any object of light that stops, is not easy to receive the human damage that causes because of misoperation.Because to detection means touching, it doesn't matter with user's frequency of utilization, and its mission life depends on the life-span of operating circuit, so long service life.Because it need not increase any top layer in the display front, the display effect of display had no influence.Because principle of work and device property, the requirement of using under the mal-condition is satisfied in all reliable and stable work of ability under conditions such as high low temperature and infrabar.
There are some infrared touch panels need satisfy night viewing compatible and requirement such as mode switch round the clock, so need regulate ir radiant power at any time.Generally speaking, realize adjusting, and then realize adjusting radiation power to drive current through the current-limiting resistance of regulating infrared transmitting tube.Because the consistance difference of infrared transmitting tube and the difference of circuit board upper conductor resistance cause same current-limiting resistance when driving different infrared transmitting tubes, drive current changes.In order to guarantee to adopt same drive current to drive to all infrared transmitting tubes, introducing constant current source driving infrared transmitting tube becomes good selection.Simultaneously, in order to satisfy the needs of infrared touch panel to the radiation power management, we have introduced digital-control constant-flow source and have realized the driving to infrared transmitting tube.
Summary of the invention
The technical matters that the present invention will solve provides infrared touch panel and the constant current source driving circuit that a kind of constant current source drives; Adopt digital-control constant-flow source to drive the infrared transmitting tube of infrared touch panel; Make it to realize stable infrared signal radiation; Can regulate the radiation intensity of infrared transmitting tube again as required, and then improve stability, the reliability of infrared touch panel and prolong its serviceable life.
The present invention adopts following technical scheme to solve the problems of the technologies described above: the infrared touch panel that a kind of constant current source drives; Comprise infrared transmitting tube array, infrared receiving tube array, infrared emission tube drive circuit, infrared receiving tube gating circuit; And single-chip microcomputer; Said infrared emission tube drive circuit one end is connected to the infrared transmitting tube array; Said infrared receiving tube gating circuit one end is connected to the infrared receiving tube array, and the said infrared emission tube drive circuit and the infrared receiving tube gating circuit other end are connected to single-chip microcomputer, and said infrared emission tube drive circuit is a constant current source driving circuit.
As further improvement of the present invention; Said constant current source driving circuit comprises comparer, electric current adjustment pipe, resistance R 1, resistance R 2, and wherein the normal phase input end of comparer is imported given magnitude of voltage, and inverting input is received between first end and resistance R 1 of electric current adjustment pipe; Output terminal is connected to second end of electric current adjustment pipe through resistance R 2; And the other end of resistance R 1 is connected to the positive voltage terminal of comparer, and the 3rd end of electric current adjustment pipe M1 is connected to load, promptly by the infrared transmitting tube of its driving.
As further improvement of the present invention, said constant current source driving circuit also comprises a digital to analog converter, and said digital to analog converter one end is connected to the normal phase input end of comparer; The other end is connected to single-chip microcomputer; At this moment, the given magnitude of voltage of comparer is produced by digital to analog converter, promptly provides digital signal by single-chip microcomputer; Convert d. c. voltage signal into through digital to analog converter, realize control constant current source.
As further improvement of the present invention; The infrared touch panel that described constant current source drives also comprises signal condition and D/A converting circuit; Said signal condition and D/A converting circuit one end are connected to the infrared receiving tube gating circuit; The other end is connected to single-chip microcomputer, and said infrared receiving tube converts infrared radiation to corresponding photocurrent input signal conditioning and analog to digital conversion circuit, and signal condition and analog to digital conversion circuit are realized photocurrent is converted to and the proportional digital quantity of photocurrent; Feed back to single-chip microcomputer, and then ir radiant power is managed.
As further improvement of the present invention; The concrete steps of said chip microcontroller ir radiant power management are following: at first single-chip microcomputer is provided with a plurality of specified digital quantities according to the different radiation power demand of infrared touch panel; After the single-chip microcomputer initialization; Select a specified digital quantity as required, get into the management cycle of ir radiant power; When radiation power does not meet the demands; Single-chip microcomputer increases or reduces the radiation power of infrared transmitting tube through control constant-current source circuit drive current, obtains the digital quantity that feeds back from signal condition and analog to digital conversion circuit; Feed back to single-chip microcomputer; Single-chip microcomputer is further controlled digital-control constant-flow source, up to satisfying the radiation power demand through the digital quantity that relatively feeds back and specified digital quantity; When radiation power met the demands, single-chip microcomputer turned to and touches the input recognizer.
The present invention also provides a kind of constant current source driving circuit; Comprise comparer, electric current adjustment pipe, resistance R 1, resistance R 2, wherein the normal phase input end of comparer is imported given magnitude of voltage, and inverting input is received between first end and resistance R 1 of electric current adjustment pipe; Output terminal is connected to second end of electric current adjustment pipe through resistance R 2; And the other end of resistance R 1 is connected to the positive voltage terminal of comparer, and the 3rd end of electric current adjustment pipe M1 is connected to load, promptly by the infrared transmitting tube of its driving; Said electric current adjustment pipe adopts FET; First end of said electric current adjustment pipe is the drain electrode of FET, and second end is the grid of FET, and the 3rd end is the source electrode of FET.
The invention has the advantages that: adopt digital-control constant-flow source to drive the infrared transmitting tube of infrared touch panel; Make it to realize stable infrared signal radiation; Can regulate the radiation intensity of infrared transmitting tube again as required, and then improve stability, the reliability of infrared touch panel and prolong its serviceable life.
Description of drawings
Fig. 1 is an infrared touch panel electrical block diagram of the present invention.
Fig. 2 is a constant current source driving circuit structural drawing of the present invention.
Fig. 3 is a digital-control constant-flow source electrical block diagram of the present invention.
Fig. 4 is signal condition and an analog to digital conversion circuit structural representation among the present invention.
Fig. 5 is the ir radiant power management flow chart of single-chip microcomputer among the present invention.
Embodiment
As shown in Figure 1, the infrared touch panel that constant current source of the present invention drives comprises infrared transmitting tube array, infrared receiving tube array, infrared emission tube drive circuit, infrared receiving tube gating circuit, signal condition and D/A converting circuit, single-chip microcomputer (MCU) and communication interface.
Said infrared emission tube drive circuit one end is connected to single-chip microcomputer; The other end is connected to the infrared transmitting tube array; Said infrared receiving tube gating circuit one end is connected to the infrared receiving tube array, and the other end is connected to single-chip microcomputer, and said signal condition and D/A converting circuit one end are connected to the infrared receiving tube gating circuit; The other end is connected to single-chip microcomputer, and communication interface links to each other with single-chip microcomputer.Said infrared emission tube drive circuit is a constant current source driving circuit; Infrared receiving tube converts infrared radiation to corresponding photocurrent input signal conditioning and analog to digital conversion circuit; And signal condition and analog to digital conversion circuit are realized photocurrent is converted to and the proportional digital quantity of photocurrent, feed back to single-chip microcomputer.Said Single-chip Controlling touches the identification of input and ir radiant power is managed.
Said infrared transmitting tube array and infrared receiving tube array are realized infrared radiation and reception respectively, judge according to the signal that receives whether the input of touch is arranged.The spatial intensity distribution of infrared transmitting tube array decision infrared radiation, the infrared receiving tube array converts infrared radiation into the photocurrent of response.Find in the test that the changes in amplitude of the opto-electronic conversion electric current that the outer power valve array of employing SMT encapsulation and infrared receiving tube array are final is bigger.Under the acting in conjunction of factors such as consistance difference, deviations and the transmitter current of infrared transmitting tube and infrared receiving tube is inconsistent; Cause the spatial intensity distribution of infrared radiation inhomogeneous; Thereby cause final opto-electronic conversion current unevenness even, thereby influence touches the identification of input.
The consistance difference of infrared transmitting tube and infrared receiving tube determines by production technology, and the user is unique, and what can do is exactly to select rational device, and carries out suitable screening, and however the consistance difference of pipe is intrinsic, can't eliminate; The employing machine pastes technology and replaces manual welding technology; Can improve the bearing accuracy of infrared transmitting tube and infrared receiving tube greatly; Make the even and collimation of arrangement of outer power valve array and infrared receiving tube array, help making up the spatial intensity distribution of uniform infrared radiation like this; In addition; Under the situation of giant-screen; Bigger difference possibly appear in the track lengths of infrared emission receiving device, thereby causes walking the line resistance difference, in this case if adopt simple current-limiting resistance method; The drive current of different pipes is dissimilated, thereby cause the infrared radiation of varying strength.Take all factors into consideration above-mentioned three's situation, introduce constant current source infrared transmitting tube is driven, help forming the spatial intensity distribution of infrared radiation relatively uniformly.
Said infrared emission tube drive circuit is constant current source driving circuit, and is as shown in Figure 2, is the structural representation of this constant current source driving circuit, and this circuit constitutes Current Negative Three-Point Capacitance, thus the current constant that makes output.This constant current source driving circuit comprises comparer U1, electric current adjustment pipe M1, resistance R 1, resistance R 2, and the D1 among Fig. 2 is an infrared transmitting tube, is the load of this constant current source driving circuit.Wherein the normal phase input end of comparer U1 is imported given magnitude of voltage Ui; Inverting input is received between first end and resistance R 1 of electric current adjustment pipe M1; Output terminal is connected to second end of electric current adjustment pipe M1 through resistance R 2; Positive voltage termination+5V voltage of comparer U1, and the other end of resistance R 1 is connected to the positive voltage terminal of comparer U1, negative voltage termination-5V voltage of comparer U1.The 3rd end of electric current adjustment pipe M1 is connected to load, promptly by the infrared transmitting tube D1 of its driving.
As preferred version, said electric current adjustment pipe M1 adopts FET.
As further preferred version, first end of said electric current adjustment pipe is the drain electrode of FET, and second end is the grid of FET, and the 3rd end is the source electrode of FET.
As preferred version further, as shown in Figure 3, said constant current source driving circuit also comprises a digital to analog converter (DAC); Said digital to analog converter one end is connected to the normal phase input end of comparer U1, and the other end is connected to single-chip microcomputer, at this moment; The given magnitude of voltage Ui of comparer U1 is produced by digital to analog converter, can provide digital signal by single-chip microcomputer, converts d. c. voltage signal into through digital to analog converter; Realization is to the control of constant current source, Here it is digital-control constant-flow source.
In the such scheme, resistance R 1 is a sampling resistor, converts output current to the Voltage Feedback component; Electric current adjustment pipe M1 is used to regulate output current, the reason that adopts FET be such device have conducting resistance little to the milliohm magnitude, grid current is minimum, output current is big and advantage such as good linearity; Comparer U1 realizes the accurate control of current source; And the electric current I d=that constant current source provides (5-Ui)/R1 is irrelevant with the infrared transmitting tube and the size of walking line resistance of connecting, so the drive current of each infrared transmitting tube all is the same.This circuit has been realized the control of voltage to the constant current source output current.
As shown in Figure 4, said signal condition and analog to digital conversion circuit comprise prime amplifier M1, low-pass filter M2, programmable amplifier M3 and the analog to digital converter M4 that is linked in sequence successively.The main effect of prime amplifier M1 is to convert faint photocurrent to stronger voltage signal, to make things convenient for the processing of subsequent conditioning circuit; The effect of low-pass filter M2 is the high-frequency interferencing signal in the filtering prime amplifier M1 output voltage signal, reduces distorted signals; The effect of programmable amplifier M3 is, according to the signal power different magnifications is provided, make final output signal amplitude about equally; The effect of analog to digital converter M4 is after the simulating signal of amplifying through programmable amplifier M3 is changed through AD, to convert digital signal to, is sent to single-chip microcomputer and carries out the numerical value processing.
Infrared receiving tube converts infrared radiation the prime amplifier M1 of corresponding photocurrent input signal conditioning and analog to digital conversion circuit to, and signal condition and analog to digital conversion circuit are realized photocurrent is converted to and the proportional digital quantity of photocurrent, feed back to single-chip microcomputer.Single-chip microcomputer can carry out touch recognition according to the signal that feeds back; And can know the state of infrared sensing media; Further perhaps to weaken the radiation power of infrared transmitting tube as feedback information, remove to safeguard the state of good infrared sensing media through enhancing.
During real work, can obtain a specified digital quantity, come the corresponding state of infrared sensing media preferably through design or experiment.Signal condition and analog to digital conversion result's digital quantity is fed back to SCM system; Single-chip microcomputer is through the digital quantity that relatively feeds back and specified digital quantity; Go to control the size of current of digital-control constant-flow source circuit output; Make infrared touch panel finally be operated in the state of good infrared sensing media, improve the overall performance of infrared touch panel.
Utilize above-mentioned constant current source can realize the ir radiant power management, this performance that will be very beneficial for infrared touch panel improves, and its reason has two; One of which, constant current source drive infrared transmitting tube, make the infrared transmitting tube array can composition homogeneity the spatial intensity distribution of infrared radiation preferably, make up the identification that good sensing media is beneficial to touch input; Two, infrared touch panel has different demands to ir radiant power, and digital-control constant-flow source is easy to controlled by singlechip controller, satisfies actual various demand.Analyze the various demands of infrared touch panel, can carry out the ir radiant power management respectively from the following aspects:
The first, the radiation power on touch-screen length limit is different;
Large screen display has a long and short two limit usually, and under same infrared remote receiver sensitivity situation, the radiation power on length limit should be different; The infrared emission receiving array that distance is far away needs bigger ir radiant power; The infrared emission receiving array of close together needs less ir radiant power.
The second, round the clock the radiation power of pattern is different;
Spacecraft need to open night observation device, and night observation device also is to utilize infrared principles to process when night work, thus the infrared touch panel that uses in the spacecraft when working at night, should radiation power be reduced, to satisfy the demand of night viewing compatible; During operation, because the strong interference of the infrared spectrum of sunshine need raise the radiation power of infrared touch panel, with the signal to noise ratio (S/N ratio) of suitable raising infrared touch panel, this will help anti-high light interference characteristic to spacecraft by day.
Three, the radiation power of infrared touch panel itself management;
The limited service life of infrared emission device, especially drive current are big more, cause device aging more easily.In the time of the infrared touch panel operate as normal, occur the long-time situation that does not touch input sometimes,, can suitably reduce ir radiant power, postpone its ageing process to this situation; In addition, when wearing out appearred in infrared power valve, the efficient of infrared device and sensitivity descended; Drive current that originally can operate as normal can not make power valve launch the infrared radiation of sufficient intensity; In this case, can suitably increase certain drive current, strengthen the infrared radiation of power valve; Make it continue to keep normal work, prolong its serviceable life.
Because infrared touch panel needs several different radiation powers to meet the different needs; Therefore a plurality of specified digital quantities can be set; Like specified daytime mode digital amount, specified night mode digital amount, specified long limit digital quantity, specified minor face digital quantity, specified idle digital quantity or the like, the specified digital quantity that different radiation powers is corresponding different.Single-chip microcomputer uses various specified digital quantities according to various demand occasions, and digital-control constant-flow source is carried out good FEEDBACK CONTROL, thereby realizes the management of radiation power.
As shown in Figure 5, the concrete steps of said chip microcontroller ir radiant power management are following: after the single-chip microcomputer initialization, select certain specified digital quantity as required, get into the management cycle of ir radiant power; When radiation power does not meet the demands; Single-chip microcomputer increases or reduces the radiation power of infrared transmitting tube through control digital-control constant-flow source drives electric current, obtains the digital quantity that feeds back from signal condition and analog to digital conversion circuit; Feed back to single-chip microcomputer; Single-chip microcomputer is further controlled digital-control constant-flow source, up to satisfying the radiation power demand through the digital quantity that relatively feeds back and specified digital quantity; When radiation power met the demands, single-chip microcomputer turned to and touches the input recognizer.
To sum up; Adopt constant current source to drive infrared transmitting tube; Can eliminate the influence of conductor resistances different on the lamp plate to the infrared emission receiving device; Make the drive current of each infrared transmitting tube equate, and then make up the spatial intensity distribution of the infrared radiation of uniformity, construct the performance of optimal infrared sensing media with the OPTIMIZED INFRARED touch-screen.Further, proposing numerically controlled constant current source drives infrared transmitting tube.The infrared touch panel that adopts constant current source to drive can be regulated drive current according to actual needs, realizes the open loop control to infrared transmitting tube; Gather infrared reception signal and carry out signal condition and analog to digital conversion; Value of feedback as the infrared emission signal; Can constitute the backfeed loop of a closure, realize closed-loop control, make the radiation power of infrared transmitting tube reach design load and keep constant infrared transmitting tube; Because the output current of digital-control constant-flow source is controlled, therefore can realize the management of ir radiant power, with multiple radiation power demand that satisfies infrared touch panel and the life-span that prolongs infrared device.
The above is merely the preferred embodiment of the invention; Not in order to restriction the invention; Any modification of being done within all spirit and principles in the invention, be equal to replacement and improvement etc., all should be included within the protection domain of the invention.
Claims (10)
1. the infrared touch panel that drives of a constant current source; Comprise infrared transmitting tube array, infrared receiving tube array, infrared emission tube drive circuit, infrared receiving tube gating circuit; And single-chip microcomputer; Said infrared emission tube drive circuit one end is connected to the infrared transmitting tube array; Said infrared receiving tube gating circuit one end is connected to the infrared receiving tube array, and the said infrared emission tube drive circuit and the infrared receiving tube gating circuit other end are connected to single-chip microcomputer, it is characterized in that: said infrared emission tube drive circuit is a constant current source driving circuit.
2. the infrared touch panel that constant current source according to claim 1 drives; It is characterized in that: said constant current source driving circuit comprises comparer, electric current adjustment pipe, resistance R 1, resistance R 2; Wherein the normal phase input end of comparer is imported given magnitude of voltage; Inverting input is received between first end and resistance R 1 of electric current adjustment pipe, and output terminal is connected to second end that the electric current adjustment is managed through resistance R 2, and the other end of resistance R 1 is connected to the positive voltage terminal of comparer; The 3rd end of electric current adjustment pipe M1 is connected to load, promptly by the infrared transmitting tube of its driving.
3. the infrared touch panel that constant current source according to claim 2 drives, it is characterized in that: said constant current source driving circuit also comprises a digital to analog converter, said digital to analog converter one end is connected to the normal phase input end of comparer; The other end is connected to single-chip microcomputer; At this moment, the given magnitude of voltage of comparer is produced by digital to analog converter, promptly provides digital signal by single-chip microcomputer; Convert d. c. voltage signal into through digital to analog converter, realize control constant current source.
4. according to the infrared touch panel of claim 2 or 3 described constant current sources drivings, it is characterized in that: said electric current adjustment pipe adopts FET.
5. the infrared touch panel that constant current source according to claim 4 drives is characterized in that: first end of said electric current adjustment pipe is the drain electrode of FET, and second end is the grid of FET, and the 3rd end is the source electrode of FET.
6. the infrared touch panel that drives according to each described constant current source of claim 1 to 3; It is characterized in that: also comprise signal condition and D/A converting circuit; Said signal condition and D/A converting circuit one end are connected to the infrared receiving tube gating circuit; The other end is connected to single-chip microcomputer, and said infrared receiving tube converts infrared radiation to corresponding photocurrent input signal conditioning and analog to digital conversion circuit, and signal condition and analog to digital conversion circuit are realized photocurrent is converted to and the proportional digital quantity of photocurrent; Feed back to single-chip microcomputer, and then ir radiant power is managed.
7. the infrared touch panel that constant current source according to claim 6 drives; It is characterized in that: said signal condition and analog to digital conversion circuit comprise prime amplifier, low-pass filter, programmable amplifier and the analog to digital converter that is linked in sequence successively; Prime amplifier converts faint photocurrent to stronger voltage signal; High-frequency interferencing signal in the low pass filter filters out prime amplifier output voltage signal; Programmable amplifier provides different magnifications according to the signal power; The analog signal conversion that analog to digital converter will pass through the programmable amplifier amplification becomes digital signal, is sent to single-chip microcomputer and carries out the numerical value processing, and infrared receiving tube converts infrared radiation to the prime amplifier of corresponding photocurrent input signal conditioning and analog to digital conversion circuit.
8. the infrared touch panel that constant current source according to claim 6 drives; It is characterized in that: the concrete steps of said chip microcontroller ir radiant power management are following: at first single-chip microcomputer is provided with a plurality of specified digital quantities according to the different radiation power demand of infrared touch panel; After the single-chip microcomputer initialization; Select a specified digital quantity as required, get into the management cycle of ir radiant power; When radiation power does not meet the demands; Single-chip microcomputer increases or reduces the radiation power of infrared transmitting tube through control constant-current source circuit drive current, obtains the digital quantity that feeds back from signal condition and analog to digital conversion circuit; Feed back to single-chip microcomputer; Single-chip microcomputer is further controlled digital-control constant-flow source, up to satisfying the radiation power demand through the digital quantity that relatively feeds back and specified digital quantity; When radiation power met the demands, single-chip microcomputer turned to and touches the input recognizer.
9. constant current source driving circuit; It is characterized in that: comprise comparer, electric current adjustment pipe, resistance R 1, resistance R 2, wherein the normal phase input end of comparer is imported given magnitude of voltage, and inverting input is received between first end and resistance R 1 of electric current adjustment pipe; Output terminal is connected to second end of electric current adjustment pipe through resistance R 2; And the other end of resistance R 1 is connected to the positive voltage terminal of comparer, and the 3rd end of electric current adjustment pipe M1 is connected to load, promptly by the infrared transmitting tube of its driving; Said electric current adjustment pipe adopts FET; First end of said electric current adjustment pipe is the drain electrode of FET, and second end is the grid of FET, and the 3rd end is the source electrode of FET.
10. constant current source driving circuit according to claim 9 is characterized in that: said constant current source driving circuit also comprises a digital to analog converter, and said digital to analog converter one end is connected to the normal phase input end of comparer; The other end is connected to single-chip microcomputer; At this moment, the given magnitude of voltage of comparer is produced by digital to analog converter, promptly provides digital signal by single-chip microcomputer; Convert d. c. voltage signal into through digital to analog converter, realize control constant current source.
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Application publication date: 20121017 |