CN106598352A - Infrared touch equipment and voltage signal generation method - Google Patents
Infrared touch equipment and voltage signal generation method Download PDFInfo
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- CN106598352A CN106598352A CN201610928277.XA CN201610928277A CN106598352A CN 106598352 A CN106598352 A CN 106598352A CN 201610928277 A CN201610928277 A CN 201610928277A CN 106598352 A CN106598352 A CN 106598352A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
- G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
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Abstract
The invention discloses infrared touch equipment. A receiving module of an infrared touch screen of the infrared touch equipment comprises a resistor circuit and a photosensitive diode circuit, wherein the resistor circuit is provided with multiple sampling resistors corresponding to a preset light intensity range and used for selecting the sampling resistors corresponding to the light intensity range where the light intensity of the environment is located according to the light intensity of the environment where the infrared touch equipment is currently located to convert a light current signal into a voltage signal; the photosensitive diode circuit is connected with the resistor circuit, grounded through the resistor circuit and used for generating the light current signal according to the light intensity of the environment. By the application of the scheme, a proper sampling resistor can be selected according to the actual light intensity range on the basis of meeting the requirement for light resistance, therefore, the driving current and power consumption brought by emission of the infrared touch equipment on a pipe are lowered, and the service life of the infrared touch equipment is prolonged. Meanwhile, the invention furthermore provides a voltage signal generation method and device.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of infrared touch device.The present invention also relates to one kind
Voltage signal generation method.
Background technology
Touch screen is an electronic system that can detect the presence and position touched in viewing area, and it simplifies
Man-machine interaction method.In current touch technology, infrared touch technology has that environmental suitability is strong, the life-span is longer, recognizable touch
The points advantage such as more.
Infrared technology touch screen (InfraredTouch ScreenTechnology) is by being mounted on touch screen housing
Infrared emitting and receiving sensing element is constituted, and in screen surface, forms infra-red detection net, and any touching object can change
Infrared ray on contact and realize touch screen operation.Infrared-type touch screen realizes that principle is similar to surface acoustic wave type touch-control,
It uses Infrared emitting and receiving sensing element.These elements form infra-red detection net, touch-control behaviour in screen surface
The object (such as finger) of work can change the infrared ray of electric shock, and then be converted to the coordinate position of touch-control and realize what is operated
Response.On infrared-type touch screen, the circuit board arrangement of the four sides arrangement of screen has infrared transmitting tube and infrared receiving tube, right
The infrared ray matrix for intersecting anyhow should be formed.
Infrared touch panel is not only simple in structure, and can not be by the interference such as electric current, voltage and electrostatic therefore suitable perhaps
Use under many adverse circumstances, while infrared touch panel has the advantages that high stability, high-resolution, easy for installation, just get at present
To get over the main product for becoming touch screen market.
As shown in figure 1, the schematic diagram of the reception signal processing circuit for prior art mid-infrared touch screen.The program is to light
Quick diode (reception pipe) plus a bias voltage, are grounded by sampling resistor R, photo-signal are converted to voltage signal.
Assume that the photoelectric current for producing is I (ψ), the light intensity that ψ is received for light sensitive diode, then the signal amplitude for producing is：V (ψ)=R
I (ψ), in other words, under the conditions of light intensity identical, sampling resistor R is bigger, and the signal amplitude V (ψ) of generation is bigger.Infrared emission
Pipe switch produce light intensity difference be Δ (ψ), then the signal difference for producing：Δ V (ψ)=Δ (ψ) R, wherein Δ V (ψ)=it is effective
Signal.
However, infrared touch panel is when work, if containing a large amount of infrared compositions in environment, it is particularly straight in sunlight
Penetrate down, due to ultrared interference, infrared touch panel can be caused to use.Therefore when infrared touch panel is designed, it is necessary to examine
Consider anti-light performance, it is ensured that the impact of touch screen light not interfered by outside.
Method anti-light at present is varied, except software algorithm and configuration aspects, mainly has following several sides on circuit
Method：
1. RC filter circuits are used：Frequency of the interference light frequency in general environment less than infrared touch panel signal, can be with
Useful signal is thought for high-frequency signal, interference signal is low frequency signal, the interference signal of low frequency is filtered by filter circuit；
2. the characteristic that can not be mutated using two polygonal voltage of capacitor, capacitor necessarily connect the signal after photoelectric conversion, one end
Switch of releasing is connect, the voltage that ambient light is produced is stored on electric capacity.When useful signal arrives, switch of releasing, electric capacity are closed
The signal of output is then the higher useful signal of signal to noise ratio.
3. transmitting terminal uses the mode of carrier modulation, receiving terminal to be filtered and demodulation process.
Inventor has found that during the present invention is realized above scheme can filter dry in certain environment range of light intensity
Disturb optical signal and reach anti-light effect, but have a premise, be exactly that (at position 1) signal can not at the sampling resistor of most original
Voltage V (ψ) ＜ VCC at saturation, i.e., 1.To reach this target, need to reduce the value of sampling resistor R, to avoid in strong environment
Light time signal saturation.But, after sampling resistor determines, its maximum anti-light performance just has determined.Simultaneously as less sampling
The useful signal that resistance is produced is weaker, needs to increase the power of emission lamp, that is, increases driving current, increases system power dissipation, larger
Rush of current be easily reduced life-span of product.And it is actually used in, the stronger use scene of ambient light is less, need not use
Too little sampling resistor.
As can be seen here, how to select suitable sampling resistor on the basis of light resistance is met according to actual needs, so as to
The power consumption for reducing infrared touch device and the life-span for improving infrared touch device, become those skilled in the art urgently to be resolved hurrily
Technical problem.
The content of the invention
The invention provides a kind of infrared touch device, selected on the basis of light resistance is met according to actual needs
Suitable sampling resistor, and then reduce the power consumption of infrared touch device and improve the life-span of infrared touch device, it is described infrared
The infrared touch panel of touch apparatus includes resistance circuit and light sensitive diode circuit, wherein：
The resistance circuit is provided with multiple sampling resistors corresponding with default range of light intensities respectively, for according to described
The ambient light intensity that infrared touch device is presently in, selects adopt corresponding with the range of light intensities that the ambient light intensity is located
Photo-signal is converted to voltage signal by sample resistance；
The light sensitive diode circuit is connected with the resistance circuit, and is grounded by the resistance circuit, for basis
The ambient light intensity produces the photo-signal.
Preferably, the resistance circuit includes multidiameter option switch and multiple sampling resistors, wherein：
The multidiameter option switch is connected with the light sensitive diode circuit, each sampling resistor respectively with the multichannel
Selecting switch is connected and is grounded.
Preferably, the infrared touch device also includes control interface, and the light sensitive diode circuit includes on-off control
Circuit and light sensitive diode, wherein：
The control interface is connected with the ON-OFF control circuit, for needing for the photo-signal to be sent to institute
When stating resistance circuit, high level signal is sent to the ON-OFF control circuit, and the photo-signal need not sent out
When giving the resistance circuit, low level signal is sent to the ON-OFF control circuit；
The ON-OFF control circuit, for turning on when the high level signal is received, and by the photo-signal
The resistance circuit is sent to, and is ended when the low level signal is received, and intercept the photo-signal.
Preferably, the ON-OFF control circuit is by controlling resistance and audion is constituted, wherein：
The base stage of the audion is connected with the positive pole of the control resistance and the light sensitive diode respectively, and described three
The colelctor electrode of pole pipe is connected with power output interface, and the emitter stage of the audion is connected with the resistance circuit；
The negative pole of the control resistance and the light sensitive diode is connected with the control interface respectively.
Preferably, when the infrared touch device includes multiple resistance circuits and multiple light sensitive diode electricity
Lu Shi, each resistance circuit are parallel with one another, and are connected from the different light sensitive diode circuits respectively；
Wherein, quantity of the quantity of the light sensitive diode circuit not less than the resistance circuit.
Accordingly, the application proposes a kind of generation method of voltage signal, is applied to infrared touch device as above
In, the infrared touch device is preset different light model intensity and is enclosed and the corresponding relation between each sampling resistor, the method
Also include：
The infrared touch device determines the range of light intensities that current ambient light intensity is located；
The infrared touch device controls the resistance circuit according to the corresponding relation and selects and the range of light intensities
Corresponding sampling resistor；
The photo-signal that the light sensitive diode circuit is produced by the infrared touch device by the sampling resistor,
Be converted to voltage signal.
Preferably, the infrared touch device determines the range of light intensities that current ambient light intensity is located, specially：
Detect the voltage of the sampling resistor；
The range of light intensities is determined according to the amplitude of the voltage.
Preferably, when needing for the photo-signal to be sent to the resistance circuit, the infrared touch device leads to
Cross the control interface high level signal is sent to the ON-OFF control circuit, so that ON-OFF control circuit conducting, and will
The photo-signal is sent to the resistance circuit；
When the photo-signal being sent to the resistance circuit, the infrared touch device is by described
Control interface sends low level signal to the ON-OFF control circuit, so that ON-OFF control circuit cut-off, and intercept described
Photo-signal.
Accordingly, the application proposes a kind of voltage signal generating means, is arranged in infrared touch device as above,
Characterized in that, including：
Memory module, stores the corresponding relation between different range of light intensities and each sampling resistor；
Acquisition module, it is determined that the range of light intensities that current ambient light intensity is located；
Control module, controls the resistance circuit according to the corresponding relation and selects adopt corresponding with the range of light intensities
Sample resistance；
Generation module, the photo-signal produced the light sensitive diode circuit by the sampling resistor, is converted to
Voltage signal.
Preferably, the acquisition module is specifically included：
Detection sub-module, detects the voltage of the sampling resistor；
Determination sub-module, determines the range of light intensities according to the amplitude of the voltage.
Preferably, also include：
Sending module, when needing for the photo-signal to be sent to the resistance circuit, by the control interface
High level signal is sent to the ON-OFF control circuit, so that ON-OFF control circuit conducting, and by the photo-signal
It is sent to the resistance circuit；
Module is intercepted, when the photo-signal being sent to the resistance circuit, is connect by the control
Mouth sends low level signal to the ON-OFF control circuit, so that ON-OFF control circuit cut-off, and intercept the photoelectric current
Signal.
Compared with prior art, the Advantageous Effects of the technical scheme proposed by the embodiment of the present application at least include：
The application proposes a kind of infrared touch device, and the receiver module of its infrared touch panel includes resistance circuit and photosensitive
Diode circuit, wherein：Resistance circuit is provided with multiple sampling resistors corresponding with default range of light intensities respectively, for basis
The ambient light intensity that infrared touch device is presently in, selects sampling electricity corresponding with the range of light intensities that ambient light intensity is located
Photo-signal is converted to voltage signal by resistance；Light sensitive diode circuit is connected with resistance circuit, and is connect by resistance circuit
Ground, for producing photo-signal according to ambient light intensity.By applying this programme, can on the basis of light resistance is met,
Suitable sampling resistor is selected according to actual light intensity degree scope, so as to reduce driving electricity of the transmitting of infrared touch device to pipe
Stream and power consumption, improve the life-span of infrared touch device.
Description of the drawings
In order to be illustrated more clearly that the technical scheme of the application, embodiment will be described below needed for accompanying drawing to be used
It is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present application, general for this area
For logical technical staff, on the premise of not paying creative work, can be with according to these other accompanying drawings of accompanying drawings acquisition.
Schematic diagrams of the Fig. 1 for the reception signal processing circuit of prior art mid-infrared touch screen；
Fig. 2 is a kind of structural representation of infrared touch device that the embodiment of the present application one is proposed；
Fig. 3 is a kind of schematic flow sheet of voltage signal generation method that the embodiment of the present application two is proposed；
Fig. 4 is the circuit diagram of a kind of many sampling resistors that the application specific embodiment is proposed；
Fig. 5 is a kind of schematic diagram of packet circuit that the application specific embodiment is proposed；
Fig. 6 is a kind of schematic diagram to pipe packet that the application specific embodiment is proposed；
Fig. 7 is a kind of schematic diagram of sampling resistor that the application specific embodiment is proposed；
Fig. 8 is a kind of structural representation of voltage signal generating means that the application is proposed.
Specific embodiment
As stated in the Background Art, in the design of existing infrared touch panel, sampling resistor is changeless.In order to full
Demand under the stronger environment of sufficient ambient light, needs to arrange the sampling resistor of little resistance.But in actual applications, ambient light compared with
Strong use scene is simultaneously few, under normally using scene, the basic interior employing resistance being necessary using little resistance.Because such as
Sampling resistor of the fruit using little resistance, the useful signal of generation can be weaker, needs to increase the power of emission lamp for this, that is, increases
Driving current, increases system power dissipation.Meanwhile, larger rush of current is easily reduced the service life of product.
Therefore, the application proposes a kind of infrared touch device, and its infrared touch panel includes resistance circuit and photosensitive two pole
Pipe circuit, wherein：Resistance circuit is provided with multiple sampling resistors corresponding with default range of light intensities respectively, for according to infrared
The ambient light intensity that touch apparatus are presently in, selects sampling resistor corresponding with the range of light intensities that ambient light intensity is located,
Photo-signal is converted to into voltage signal；Light sensitive diode circuit is connected with resistance circuit, and is grounded by resistance circuit,
For producing photo-signal according to ambient light intensity.The infrared touch device proposed by the application, can be according to working as front ring
The intensity of border light, automatically selects suitable sampling resistor to produce voltage signal, so as to reduce sending out for infrared touch device
The driving current to pipe and power consumption are penetrated, the life-span of infrared touch device is improve.
Embodiment one
Based on discussed above, a kind of structural representation of infrared touch screen equipment of the application proposition, bag are illustrated in figure 2
Include resistance circuit 201 and light sensitive diode circuit 202, each key character part is described below：
(1) resistance circuit
In embodiments herein, it is intended to select suitable sampling electricity for resistance circuit according to different ambient light intensities
Hinder to produce voltage signal.Therefore, first in resistance circuit, it is provided with multiple corresponding with default range of light intensities respectively
Sampling resistor.Different employing resistance correspond respectively to different ambient light intensities.
It can be seen that, infrared touch screen equipment can be that resistance circuit is selected and current ring according to real-time ambient light intensity
The corresponding sampling resistor of border light intensity.So as to avoid in prior art, little resistance is still used under home light intensity
Sampling resistor, and the problem in the equipment high power consumption low life-span caused.
Due to needing to select different sampling resistors according to different ambient light intensities, it is therefore desirable to real in resistance circuit
The switching of existing difference sampling resistor.
In the preferred embodiment of the application, different samplings are realized by multidiameter option switch is arranged in resistance circuit
Switching between resistance.
Resistance circuit includes multidiameter option switch and multiple sampling resistors.Multidiameter option switch and light sensitive diode circuit
It is connected.Each sampling resistor is connected with multidiameter option switch respectively, and is grounded respectively.
Multidiameter option switch can realize the switching between different sampling resistors.When ambient light intensity changes, electricity
Resistance circuit will select sampling resistor corresponding with current environment light intensity to produce voltage signal by multidiameter option switch.
It should be noted that the scheme of above-mentioned realization difference sampling resistor switching, one kind that simply the application is proposed is preferably
Embodiment, based on the core concept of the application, those skilled in the art can also adopt the side of other sampling resistors switchings
Method, this can't affect the protection domain of the application.
(2) light sensitive diode circuit
In embodiments herein, light sensitive diode circuit is connected with resistance circuit, and is grounded by resistance circuit.Light
Quick diode circuit is for according to the ambient light intensity generation photo-signal.
Light sensitive diode circuit is the part of generation photo-signal in infrared touch panel, and which can be according to current environment
The size of light intensity produces different size of photo-signal.When ambient light intensity is less, what light sensitive diode circuit was produced
Photoelectric current is less, now needs to be equipped with larger sampling resistor, and the amplitude of the voltage signal of generation could be caused larger.Work as environment
When light intensity is larger, the photoelectric current that light sensitive diode circuit is produced is larger, now needs to be equipped with less sampling resistor, can just make
The voltage signal that must be produced is unsaturated.
With the increase of infrared touch screen dimensions, its internal light sensitive diode circuit is more and more.In actual application
In scene, and all of light sensitive diode circuit is not needed to work.Therefore, it is also desirable to arrange in light sensitive diode circuit open
Close, control whether light sensitive diode circuit connects sampling resistor.
In embodiments herein, light sensitive diode circuit includes ON-OFF control circuit and light sensitive diode.It is infrared
Touch panel device also includes control interface.
Control interface is connected with ON-OFF control circuit, for needing for photo-signal to be sent to the resistance circuit
When, high level signal is sent to ON-OFF control circuit, and when photo-signal being sent to resistance circuit, Xiang Kai
Close control circuit and send low level signal.
ON-OFF control circuit, for turning on when the high level signal of control interface transmission is received, and by photosensitive two pole
The photo-signal that pipe circuit is produced is sent to resistance circuit, and cuts when the low level signal of control interface transmission is received
Only, and intercept light sensitive diode circuit generation photo-signal.
In the preferred embodiment of the application, ON-OFF control circuit is by controlling resistance and audion is constituted and photosensitive
In diode circuit, the connected mode of a components and parts is as follows：
The base stage of audion is connected with the positive pole of control resistance and the light sensitive diode respectively, the colelctor electrode of audion
It is connected with power output interface, the emitter stage of audion is connected with resistance circuit.
The negative pole of control resistance and light sensitive diode is connected with control interface respectively.
It should be noted that the operation principle of above-mentioned ON-OFF control circuit is as follows：When the high level for receiving controlling switch
During signal, audion will be turned on, and the photo-signal that now light sensitive diode is produced will be sent to resistance by audion
Circuit.When the low level signal of controlling switch is received, audion will end, the photoelectric current that now light sensitive diode is produced
Signal will be intercepted by audion.
It should be noted that the composition and connected mode of above-mentioned ON-OFF control circuit are a kind of excellent of the application proposition
The embodiment of choosing, based on the core concept of the application, those skilled in the art can be using other ON-OFF control circuit shapes
Formula, this can't affect the protection domain of the application.
Simultaneously because not all light sensitive diode circuit be required for and meanwhile work, therefore there is no need as each
Light sensitive diode circuit is all separately configured resistance circuit.In the preferred embodiment of the application, a resistance circuit is corresponding to more
The powered-down road of individual light sensitive diode.
Specifically, when infrared touch device includes multiple resistance circuits and the light sensitive diode circuit, each resistance
Circuit is parallel with one another, and is connected from different light sensitive diode circuits respectively.And each resistance circuit at least with a light
Quick diode circuit is connected, therefore the quantity of light sensitive diode circuit is not less than the quantity of resistance circuit.
Meanwhile, light sensitive diode circuit controls whether to be linked in the middle of resistance circuit by ON-OFF control circuit.
Preferred version by more than, it is larger in infrared touch screen dimensions, when light sensitive diode is more, only need to configure minority
Resistance circuit can just meet the process demand of the photo-signal that each light sensitive diode circuit is produced.It is infrared so as to reduce
The quantity of resistance circuit in touch screen, the area for reducing pcb board (printed circuit board) take.
Description from more than, the application propose a kind of infrared touch device, the receiver module bag of its infrared touch panel
Resistance circuit and light sensitive diode circuit are included, wherein：Resistance circuit is provided with multiple corresponding with default range of light intensities respectively
Sampling resistor, for the ambient light intensity being presently according to infrared touch device, select the light being located with ambient light intensity
Photo-signal is converted to voltage signal by the corresponding sampling resistor of strength range；Light sensitive diode circuit and resistance circuit
Be connected, and be grounded by resistance circuit, for photo-signal being produced according to ambient light intensity.By applying this programme, can be with
On the basis of light resistance is met, suitable sampling resistor is selected according to actual light intensity degree scope, so as to reduce infrared touch
Driving current and power consumption of the transmitting of equipment to pipe, improve the life-span of infrared touch device.
Embodiment two
Based on the infrared touch screen equipment that above example one is proposed, the application proposes a kind of voltage signal generation method,
It is applied in the infrared touch device proposed such as embodiment one.Infrared touch device presets different range of light intensities with each sampling
Corresponding relation between resistance.First, infrared touch device determines the range of light intensities that current ambient light intensity is located.Its
Secondary, infrared touch device controls resistance circuit according to above-mentioned corresponding relation and selects sampling electricity corresponding with the range of light intensities for determining
Resistance；Finally, the photo-signal that light sensitive diode circuit is produced by infrared touch device by the sampling resistor for determining, is converted to
Voltage signal.So as to realize the intensity according to current environment light, automatically select suitable sampling resistor to produce voltage signal,
The driving current and power consumption of the transmitting to pipe of infrared touch device are further reduced, the life-span of infrared touch device is improve.
Specifically, a kind of schematic flow sheet of voltage signal generation method of the application proposition, the method are illustrated in figure 3
At least comprise the following steps：
S301, infrared touch device determine the range of light intensities that current ambient light intensity is located.
In embodiments herein, it is intended to select suitable sample for resistance circuit according to different ambient light intensities
Resistance, therefore firstly the need of the range of light intensities for determining that current ambient light intensity is located.Then it is pre- according to infrared touch device
If different range of light intensities and each sampling resistor between corresponding relation, determine sampling resistor.
In the preferred embodiment of the application, it is determined that the range of light intensities that is located of current ambient light intensity can by with
Under method realizing, the method is comprised the following steps：
(1) detect the voltage of sampling resistor.
Resistance circuit all gives tacit consent to connection sampling resistor, by detecting the voltage signal of sampling resistor generation and adopting resistance
Size can determine ambient light intensity be located scope.
(2) range of light intensities is determined according to the amplitude of voltage.
S302, infrared touch device is according to the corresponding relation between different range of light intensities and each sampling resistor, control
Resistance circuit selects sampling resistor corresponding with current light intensity scope.
In embodiments herein, it is determined that after current ambient light intensity, infrared touch device will be according to difference
Range of light intensities and each sampling resistor between corresponding relation, control resistance circuit select it is corresponding with current light intensity scope
Sampling resistor.It is achieved thereby that automatically selecting sampling resistor corresponding with ambient light intensity according to current ambient light intensity.
S303, the photo-signal that light sensitive diode circuit is produced by infrared touch device by sampling resistor, is converted to
Voltage signal.
It is in embodiments herein, after sampling resistor corresponding with current environment light intensity is determined, infrared to touch
The photo-signal that light sensitive diode circuit will be produced by the sampling resistor by equipment is touched, voltage signal is converted to.So as to
On the premise of not increasing driving current, the voltage signal for enabling to produce has preferable amplitude.Therefore, solve existing skill
In art, need to increase the defect in the high power consumption low life-span that driving current is brought.
With the increase of infrared touch screen dimensions, its internal light sensitive diode circuit is more and more.In actual application
In scene, and all of light sensitive diode circuit is not needed to work.
In the preferred embodiment of the application, realize whether light sensitive diode circuit being linked into by following method
In resistance circuit.The method is comprised the following steps：
(1) when needing for photo-signal to be sent to resistance circuit, infrared touch device is by control interface to switch
Control circuit sends high level signal, so that ON-OFF control circuit conducting, and photo-signal is sent to into resistance circuit.
(2) when photo-signal being sent to resistance circuit, infrared touch device is by control interface to opening
Close control circuit and send low level signal, so that ON-OFF control circuit cut-off, and intercept photo-signal.
By the description of above method flow process, the application proposes a kind of infrared touch device, its infrared touch panel
Receiver module includes resistance circuit and light sensitive diode circuit, wherein：Resistance circuit be provided with it is multiple respectively with default light intensity
The corresponding sampling resistor of degree scope, for the ambient light intensity being presently according to infrared touch device, selects and environmental light intensity
Photo-signal is converted to voltage signal by the corresponding sampling resistor of range of light intensities that degree is located；Light sensitive diode circuit
Be connected with resistance circuit, and be grounded by resistance circuit, for photo-signal being produced according to ambient light intensity.By applying this
Scheme, can select suitable sampling resistor according to actual light intensity degree scope, so as to reduce on the basis of light resistance is met
Driving current and power consumption of the transmitting of infrared touch device to pipe, improve the life-span of infrared touch device.
In order to the technological thought of the present invention is expanded on further, in conjunction with specific application scenarios, the technical side to the present invention
Case is illustrated.
The circuit diagram of a kind of many sampling resistor circuits of the application specific embodiment proposition is illustrated in figure 4, as seen from the figure,
Photoconductive resistance is connected with multidiameter option switch, and by multiple sampling resistor ground connection in parallel.
Succession based on more than, the implementation of the application is that ambient light intensity is divided into N number of interval, Mei Yiqu
Between take an optimum sampling resistance value, suitable sampling resistor is selected by variable connector (2 tunnels and more than).Ambient light is stronger, adopts
Sample resistance value is less, to avoid signal saturation；Ambient light is weaker, and sampling resistor value is bigger, to reduce obtaining needed for useful signal
Emission lamp driving current.Specifically can be realized by below scheme.
(1) MCU (detection chip) detects the voltage of sampling resistor, according to the scope of voltage magnitude computing environment light intensity；
(2) according to the scope for calculating, control variable connector selects corresponding sampling resistor.
As the interval resistance value of each light intensity is the optional sampling resistance value for the ambient light intensity, can with compared with
Little infrared light intensity (less emission lamp driving current) obtains larger useful signal.System is automatic according to the difference of ambient light
Adjustment, realizes optimum circuit parameter.
Additionally, when the size of infrared touch frame is larger, when the light sensitive diode (reception lamp) of outfit is more, if each connects
Lamp is received all as above-mentioned design, larger difficulty can be brought in practical operation.For example, it is larger that components and parts are too many, PCB surface accumulates occupancy
Deng.To solve this problem, a kind of prioritization scheme is proposed in the specific embodiment of the application：By all of light sensitive diode
Packet, it is assumed that be divided into N groups, each light sensitive diode is by the whether connected sampling resistor of on-off control.As shown in Figure 5.So may be used
So that the group number of total sampling resistor is reduced to N groups, signal processing is focused on one piece of PCB, is easy to subsequent treatment.
Illustrate：As shown in Figure 6, it is assumed that all light sensitive diodes are divided into 8 groups, as long as then 8 groups of sampling resistors, it is assumed that
Every group of sampling resistor has two kinds, corresponds respectively to weak ambient light and strong ambient light.As shown in fig. 7, the control of each light sensitive diode
Switch processed can be realized by an audion and resistance.
Description by more than to specific embodiment, the application propose a kind of infrared touch device, and which is infrared tactile
The receiver module for touching screen includes resistance circuit and light sensitive diode circuit, wherein：Resistance circuit be provided with it is multiple respectively with it is default
The corresponding sampling resistor of range of light intensities, for the ambient light intensity being presently according to infrared touch device, select and ring
Photo-signal is converted to voltage signal by the corresponding sampling resistor of range of light intensities that border light intensity is located；Photosensitive two pole
Pipe circuit is connected with resistance circuit, and is grounded by resistance circuit, for producing photo-signal according to ambient light intensity.Pass through
Using this programme, suitable sampling resistor can be selected according to actual light intensity degree scope on the basis of light resistance is met, so as to
The driving current and power consumption of the transmitting to pipe of infrared touch device are reduced, the life-span of infrared touch device is improve.
In order to reach the technical purpose of the above, the application proposes a kind of voltage signal generating means, is arranged at embodiment one
In described infrared touch device, as illustrated, including：
Memory module 801, stores the corresponding relation between different range of light intensities and each sampling resistor；
Acquisition module 802, it is determined that the range of light intensities that current ambient light intensity is located；
Control module 803, controls the resistance circuit according to the corresponding relation and selects corresponding with the range of light intensities
Sampling resistor；
Generation module 804, the photo-signal light sensitive diode circuit produced by the sampling resistor, conversion
For voltage signal.
In specific application scenarios, the acquisition module is specifically included：
Detection sub-module, detects the voltage of the sampling resistor；
Determination sub-module, determines the range of light intensities according to the amplitude of the voltage.
In specific application scenarios, also include：
Sending module, when needing for the photo-signal to be sent to the resistance circuit, by the control interface
High level signal is sent to the ON-OFF control circuit, so that ON-OFF control circuit conducting, and by the photo-signal
It is sent to the resistance circuit；
Module is intercepted, when the photo-signal being sent to the resistance circuit, is connect by the control
Mouth sends low level signal to the ON-OFF control circuit, so that ON-OFF control circuit cut-off, and intercept the photoelectric current
Signal.
The description of concrete device from more than, a kind of the application proposition infrared touch device, its infrared touch panel connect
Receiving module includes resistance circuit and light sensitive diode circuit, wherein：Resistance circuit be provided with it is multiple respectively with default light intensity
The corresponding sampling resistor of scope, for the ambient light intensity being presently according to infrared touch device, selects and ambient light intensity
Photo-signal is converted to voltage signal by the corresponding sampling resistor of range of light intensities at place；Light sensitive diode circuit with
Resistance circuit is connected, and is grounded by resistance circuit, for producing photo-signal according to ambient light intensity.By applying we
Case, can select suitable sampling resistor according to actual light intensity degree scope on the basis of light resistance is met, red so as to reduce
Driving current and power consumption of the transmitting of outer touch apparatus to pipe, improve the life-span of infrared touch device.
Through the above description of the embodiments, those skilled in the art can be understood that the present invention can be led to
Cross hardware realization, it is also possible to by software plus necessary general hardware platform mode realizing.Based on such understanding, this
Bright technical scheme can be embodied in the form of software product, and the software product can be stored in a non-volatile memories
Medium (can be CD-ROM, USB flash disk, portable hard drive etc.) in, use so that a computer equipment (can be including some instructions
Personal computer, server, or network equipment etc.) perform method described in each implement scene of the invention.
It will be appreciated by those skilled in the art that accompanying drawing is a schematic diagram for being preferable to carry out scene, module in accompanying drawing or
Flow process is not necessarily implemented necessary to the present invention.
It will be appreciated by those skilled in the art that module in device in implement scene can according to implement scene describe into
Row is distributed in the device of implement scene, it is also possible to carry out one or more dresses that respective change is disposed other than this implement scene
In putting.The module of above-mentioned implement scene can merge into a module, it is also possible to be further split into multiple submodule.
The invention described above sequence number is for illustration only, does not represent the quality of implement scene.
Disclosed above is only that the several of the present invention are embodied as scene, but, the present invention is not limited to this, Ren Heben
What the technical staff in field can think change should all fall into protection scope of the present invention.
Claims (11)
1. a kind of infrared touch device, it is characterised in that the infrared touch panel of the infrared touch device include resistance circuit with
And light sensitive diode circuit, wherein：
The resistance circuit is provided with multiple sampling resistors corresponding with default range of light intensities respectively, for according to described infrared
The ambient light intensity that touch apparatus are presently in, selects sampling electricity corresponding with the range of light intensities that the ambient light intensity is located
Photo-signal is converted to voltage signal by resistance；
The light sensitive diode circuit is connected with the resistance circuit, and is grounded by the resistance circuit, for according to described
Ambient light intensity produces the photo-signal.
2. infrared touch device as claimed in claim 1, it is characterised in that the resistance circuit include multidiameter option switch with
And multiple sampling resistors, wherein：
The multidiameter option switch is connected with the light sensitive diode circuit, each sampling resistor respectively with the multi-path choice
Switch is connected and is grounded.
3. infrared touch device as claimed in claim 2, it is characterised in that the infrared touch device is also connect including control
Mouthful, the light sensitive diode circuit includes ON-OFF control circuit and light sensitive diode, wherein：
The control interface is connected with the ON-OFF control circuit, for needing for the photo-signal to be sent to the electricity
During resistance circuit, high level signal is sent to the ON-OFF control circuit, and the photo-signal need not be sent to
During the resistance circuit, low level signal is sent to the ON-OFF control circuit；
The ON-OFF control circuit, for turning on when the high level signal is received, and the photo-signal is sent
To the resistance circuit, and end when the low level signal is received, and intercept the photo-signal.
4. infrared touch device as claimed in claim 3, it is characterised in that the ON-OFF control circuit by control resistance and
Audion is constituted, wherein：
The base stage of the audion is connected with the positive pole of the control resistance and the light sensitive diode respectively, the audion
Colelctor electrode be connected with power output interface, the emitter stage of the audion is connected with the resistance circuit；
The negative pole of the control resistance and the light sensitive diode is connected with the control interface respectively.
5. infrared touch device as claimed in claim 3, it is characterised in that
It is when the infrared touch device includes multiple resistance circuits and multiple light sensitive diode circuits, each described
Resistance circuit is parallel with one another, and is connected from the different light sensitive diode circuits respectively；
Wherein, quantity of the quantity of the light sensitive diode circuit not less than the resistance circuit.
6. a kind of generation method of voltage signal, the infrared touch device being applied to as described in any one of claim 1-5, which is special
Levy and be, the infrared touch device presets the corresponding relation between different range of light intensities and each sampling resistor, should
Method also includes：
The infrared touch device determines the range of light intensities that current ambient light intensity is located；
The infrared touch device controls the resistance circuit according to the corresponding relation and selects corresponding with the range of light intensities
Sampling resistor；
The photo-signal that the light sensitive diode circuit is produced by the infrared touch device by the sampling resistor, conversion
For voltage signal.
7. method as claimed in claim 6, it is characterised in that the infrared touch device determines current ambient light intensity institute
Range of light intensities, specially：
Detect the voltage of the sampling resistor；
The range of light intensities is determined according to the amplitude of the voltage.
8. method as claimed in claim 6, it is characterised in that also include,
When needing for the photo-signal to be sent to the resistance circuit, the infrared touch device is connect by the control
Mouth sends high level signal to the ON-OFF control circuit, so that ON-OFF control circuit conducting, and the photoelectric current is believed
Number it is sent to the resistance circuit；
When the photo-signal being sent to the resistance circuit, the infrared touch device is by the control
Interface sends low level signal to the ON-OFF control circuit, so that ON-OFF control circuit cut-off, and intercept the photoelectricity
Stream signal.
9. a kind of voltage signal generating means, the infrared touch device being arranged at as described in any one of claim 1-5, its feature
It is, including：
Memory module, stores the corresponding relation between different range of light intensities and each sampling resistor；
Acquisition module, it is determined that the range of light intensities that current ambient light intensity is located；
Control module, controls the resistance circuit according to the corresponding relation and selects sampling electricity corresponding with the range of light intensities
Resistance；
Generation module, the photo-signal produced the light sensitive diode circuit by the sampling resistor, is converted to voltage
Signal.
10. generating means as claimed in claim 9, it is characterised in that the acquisition module is specifically included：
Detection sub-module, detects the voltage of the sampling resistor；
Determination sub-module, determines the range of light intensities according to the amplitude of the voltage.
11. generating means as claimed in claim 9, it is characterised in that also include：
Sending module, when needing for the photo-signal to be sent to the resistance circuit, by the control interface to institute
State ON-OFF control circuit and send high level signal, so that ON-OFF control circuit conducting, and the photo-signal is sent
To the resistance circuit；
Intercept module, when the photo-signal being sent to the resistance circuit, by the control interface to
The ON-OFF control circuit sends low level signal, so that ON-OFF control circuit cut-off, and intercept the photo-signal.
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| CN201610928277.XA CN106598352B (en) | 2016-10-31 | 2016-10-31 | Infrared touch device and voltage signal generation method |
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| CN201610928277.XA CN106598352B (en) | 2016-10-31 | 2016-10-31 | Infrared touch device and voltage signal generation method |
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| CN108847896A (en) * | 2018-08-29 | 2018-11-20 | 深圳市天英联合教育股份有限公司 | infrared touch screen optical signal receiving circuit |
| CN109799929A (en) * | 2019-01-09 | 2019-05-24 | 中山佳时光电科技有限公司 | A kind of anti-light touch-control electronic blank |
| CN116719436A (en) * | 2022-06-30 | 2023-09-08 | 广州众远智慧科技有限公司 | Sampling control method, control device, processor and sampling system |
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| US20120162133A1 (en) * | 2009-09-27 | 2012-06-28 | Inferpoint Systems Limited | Touch display capable of eliminating display impact on touch |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108847896A (en) * | 2018-08-29 | 2018-11-20 | 深圳市天英联合教育股份有限公司 | infrared touch screen optical signal receiving circuit |
| CN109799929A (en) * | 2019-01-09 | 2019-05-24 | 中山佳时光电科技有限公司 | A kind of anti-light touch-control electronic blank |
| CN109799929B (en) * | 2019-01-09 | 2022-02-25 | 中山佳时光电科技有限公司 | Anti-light touch electronic whiteboard |
| CN116719436A (en) * | 2022-06-30 | 2023-09-08 | 广州众远智慧科技有限公司 | Sampling control method, control device, processor and sampling system |
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| Publication number | Publication date |
|---|---|
| CN106598352B (en) | 2023-02-28 |
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