CN103631453B - signal receiving device of infrared touch frame - Google Patents
signal receiving device of infrared touch frame Download PDFInfo
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- CN103631453B CN103631453B CN201310629420.1A CN201310629420A CN103631453B CN 103631453 B CN103631453 B CN 103631453B CN 201310629420 A CN201310629420 A CN 201310629420A CN 103631453 B CN103631453 B CN 103631453B
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Abstract
A sampling assembly samples a current signal output by a receiving tube, an analog switch receives a switch time sequence signal through a control end, and is switched on after a transmitting tube of an infrared touch frame emits light according to the control of the switch time sequence signal and is switched off when the transmitting tube does not emit light. And the blocking capacitor couples and filters the signal accessed when the analog switch is switched on to obtain a coupled signal, and the coupled signal is output and used for analog-digital conversion processing. Because the analog switch is in the off state when the transmitting tube does not emit light, and the charges stored by the blocking capacitor cannot be released through the sampling assembly, the transmitting tube does not continuously emit light when the analog switch performs analog-to-digital conversion processing on the coupling signal output by the blocking capacitor, so that the working duty ratio of the transmitting tube is reduced, and the power consumption of the infrared touch frame is reduced.
Description
Technical field
The present invention relates to Infrared touch screen technology field, more particularly to a kind of signal receiving device of infrared touch frame.
Background technology
Infrared touch panel is to be respectively mounted infrared transmitting tube and infrared receiving tube on two groups of opposite side of screen frame, passes through
The touch screen to acquire touch point coordinate position for the break-make of the infrared tube light path on two groups of opposite side.
The signal receiving device of traditional infrared touch frame, the electric current producing after making infrared receiving tube opto-electronic conversion flows through
Earth resistance, produces a voltage-to-ground.This voltage is exactly raw electrical signal, and raw electrical signal is through a capacitance, coupling
Close useful signal and filter low-frequency interference signal, then analog digital conversion is carried out to the primary signal after coupling.
For guaranteeing to collect real useful signal, before sampling action completes, it is necessary to assure earth resistance produces
Voltage-to-ground exists always, therefore it is required that infrared transmitting tube was always maintained at emission state before sampling terminates, persistently provides red
Outer light is to infrared receiving tube.The signal receiving device of traditional infrared touch frame makes infrared touch frame power consumption big.
Content of the invention
Based on this it is necessary to be directed to the problems referred to above, provide a kind of infrared touch frame reducing infrared touch frame power consumption
Signal receiving device.
A kind of signal receiving device of infrared touch frame, including：Sampling component, one end connects the reception pipe of infrared touch frame
Outfan, the other end be grounded；Analog switch, input connects the common port of described sampling component and reception pipe, is used for passing through
Control end receives default switching sequence signal, and control the sending out in described infrared touch frame according to described switching sequence signal
Penetrate after pipe lights and turn on, and turn off when described transmitting tube does not light；Capacitance, one end connects the output of described analog switch
End, the signal for accessing when described analog switch is turned on is coupled and is filtered, and obtains coupled signal and exports from the other end.
The signal receiving device of above-mentioned infrared touch frame, the input of reception pipe connects power access end, sampling component pair
The current signal of reception pipe output is sampled, and analog switch receives switching sequence signal by control end, and during according to switch
The control of sequential signal turns on after the transmitting tube of infrared touch frame lights, and turns off when transmitting tube does not light.Analog switch exists
Signal during conducting obtaining sampling component sampling sends the letter accessing when analog switch is turned on to capacitance, capacitance
Number coupled and obtain coupled signal after filtering and export, as analog-to-digital conversion process.Due to the mould when transmitting tube does not light
Intending switch is off state, and the electric charge of capacitance storage discharges without going past sampling component, therefore defeated to capacitance
When the coupled signal going out carries out analog-to-digital conversion process, transmitting tube, without continuous illumination, decreases the operative duty cycles of transmitting tube, fall
Low infrared touch frame power consumption.
Brief description
Fig. 1 is the structure chart of the signal receiving device of figure infrared touch frame in an embodiment；
Fig. 2 is the structure chart of the signal receiving device that another embodiment mid-infrared touches frame；
Fig. 3 is the schematic diagram of an embodiment breaker in middle clock signal, conversion timing sequence signal and work schedule signal；
Fig. 4 is the schematic diagram of another embodiment breaker in middle clock signal, conversion timing sequence signal and work schedule signal；
Fig. 5 is the structure chart of the signal receiving device that another embodiment mid-infrared touches frame；
Fig. 6 is the structure chart of the signal receiving device that another embodiment mid-infrared touches frame.
Specific embodiment
Understandable for enabling the above objects, features and advantages of the present invention to become apparent from, below in conjunction with the accompanying drawings to the present invention
Specific embodiment be described in detail.Elaborate a lot of details in order to fully understand this in the following description
Bright.But the present invention can be much to implement different from alternate manner described here, and those skilled in the art can be not
Similar improvement is done, therefore the present invention is not limited by following public specific embodiment in the case of running counter to intension of the present invention.
It should be noted that when element is referred to as " being fixed on " another element, it can be directly on another element
Or can also there is element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or may be simultaneously present centering elements.
Unless otherwise defined, all of technology used herein and scientific terminology and the technical field belonging to the present invention
The implication that technical staff is generally understood that is identical.The term being used in the description of the invention herein is intended merely to description tool
The purpose of the embodiment of body is it is not intended that in limiting the present invention.Term as used herein " and/or " include one or more phases
The arbitrary and all of combination of the Listed Items closing.
A kind of signal receiving device of infrared touch frame, as shown in figure 1, include sampling component 110, analog switch 120 and
Capacitance 130.
Sampling component 110 one end connects the outfan of the reception pipe 200 of infrared touch frame, and the other end is grounded.Reception pipe 200
Input connect power access end VCC, reception pipe 200 leads when receiving the tube-launched infrared light of infrared touch frame
Logical.In the present embodiment, sampling component 110 is sampling resistor, and the outfan of reception pipe 200 is directly grounded by sampling resistor, simplifies
Circuit structure.In other embodiments.Sampling component 110 can be made up of the resistance of multiple series, parallel or series-parallel connection, also may be used
To be can to produce the electronic component of pressure drop using other.
The input of analog switch 120 connects the common port of sampling component 110 and reception pipe 200, for by control end
Receive default switching sequence signal, and led after the transmitting tube of infrared touch frame lights according to the control of switching sequence signal
Logical, and turn off when transmitting tube does not light.It is the break-make controlling analog switch 120 by adjusting switching sequence signal, such as originally
In embodiment, analog switch 120 can be the conducting when switching sequence signal is for high level, be low level in switching sequence signal
When turn off.Analog switch 120 specifically can adopt 4501 chips etc..
Capacitance 130 one end connects the outfan of analog switch 120, for access when analog switch 120 is turned on
Signal is coupled and is filtered, and obtains coupled signal and exports from the other end.Using capacitance 130, coupling is carried out to the signal accessing
Close and filter, transmit AC signal and cut-off direct current signal, also can make not interfereing with each other between input and the signal of output, improve dress
The stability put.
The electric current producing during reception pipe 200 conducting flows through sampling component 110 and produces a voltage-to-ground（Can be referred to as original
Signal）, to capacitance 130, capacitance 130 couples analog switch 120 conducting access primary signal to primary signal
Obtain coupled signal after Filtering Processing and export, as analog-to-digital conversion process.
The signal receiving device of above-mentioned infrared touch frame, the current signal that sampling component 110 exports to reception pipe 200 is carried out
Sampling, analog switch 120 passes through control end reception switching sequence signal, and according to the control of switching sequence signal in infrared touch
The transmitting tube of frame turns on after lighting, and turns off when transmitting tube does not light.Analog switch 120 is in conducting by sampling component 110
The signal obtaining of sampling sends to capacitance 130, and the signal that capacitance 130 accesses when analog switch 120 is turned on is carried out
Obtain coupled signal after coupling and filtering and export, as analog-to-digital conversion process.Due to the analog switch when transmitting tube does not light
120 is off state, and the electric charge of capacitance 130 storage discharges without going past sampling component 110, therefore to capacitance
When the coupled signal of 130 outputs carries out analog-to-digital conversion process, transmitting tube, without continuous illumination, reduces the work duty of transmitting tube
Ratio decreases infrared touch frame power consumption.
Wherein in an embodiment, as shown in Fig. 2 the signal receiving device of infrared touch frame may also include analog digital conversion
Device 140, analog-digital converter 140 connects the other end of capacitance 130, and analog-digital converter 140 receives conversion timing sequence signal, and root
According to conversion timing sequence signal control when analog switch 120 turns off, analog digital conversion is carried out to coupled signal, obtains digital signal.
The digital signal being converted to can send to the process chip of infrared touch panel, for judging touch point coordinate position.
Wherein in an embodiment, analog switch 120 is vertical after transmitting tube lights according to the control of switching sequence signal
Turn on, and turn off when transmitting tube does not light.The switching sequence signal of analog switch 120 break-make is controlled to exist in the present embodiment
It is high level when transmitting tube lights, be low level when transmitting tube does not light.As shown in figure 3, clock signal A, B and C are respectively
Control the switching sequence signal of analog switch 120 break-make, control the conversion timing sequence signal of analog-digital converter 140 work and control to send out
Penetrate the luminous work schedule signal of pipe, T0 is the working cycle of transmitting tube.As seen from the figure, sequential signal is high level when operating
（As the t2 period）When transmitting tube light, now switching sequence signal be high level（As the t0 period）, conversion timing sequence signal is low electricity
Flat, analog switch 120 conducting accesses the signal that sampling component 110 sampling obtains, and analog-digital converter 140 does not work.When operating
Sequential signal is that during low level, transmitting tube does not light, and now switching sequence signal is low level（As the t1 period）, conversion timing sequence signal
For high level, analog switch 120 turns off, it is to avoid the electric charge of capacitance 130 storage discharges through sampling component 110, modulus
The coupled signal that transducer 140 exports to capacitance 130 carries out analog digital conversion.Transmitting tube was no longer necessary in the whole working cycle
All luminous in T0, only need to light within the t2 period, reduce the operative duty cycles of transmitting tube, decrease infrared touch frame work(
Consumption.
Wherein in an embodiment, analog switch 120 according to the control of switching sequence signal when transmitting tube lights, warp
Turn on after spending default time delay, and turn off when transmitting tube does not light.As shown in figure 4, clock signal A1, B1 and C1 are respectively
For the switching sequence signal controlling analog switch 120 break-make, the conversion timing sequence signal controlling analog-digital converter 140 work and control
The work schedule signal that transmitting tube lights, T1 and T2 is the working cycle of transmitting tube.After transmitting tube starts transmitting, due to receiving
Pipe 200 response speed is not timely, in default time delay（T5 the and t6 period as in figure）Conduct either analog switch afterwards
120, the sampling accuracy of sampling component 110 can be improved.Time delay can be several delicate delicate to more than ten, specifically can be according to reception
The concrete model of pipe 200 is adjusted.
When the t5 period, the work schedule signal that transmitting tube lights is controlled to be high level, transmitting tube lights, and now controls mould
The switching sequence signal intending switch 120 break-makes is low level, and analog switch 120 is not turned on.When the t3 period after the t5 period,
Transmitting tube accesses, also in luminance, now analog switch 120 conducting, the signal that sampling component 110 sampling obtains, and modulus turns
Parallel operation 140 does not work.When the t4 period, analog switch 120 turns off, and analog-digital converter 140 carries out analog digital conversion.Transmitting tube is in t4
Light again during t6 period in the period, sampling component 110 is sampled to the current signal of reception pipe 200 output again, by
It is off state in now analog switch 120, sampling component 110 signal obtaining of sampling again will not be delivered to capacitance
130, the current analog digital conversion operation on analog-digital converter 140 does not result in impact.Carry out analog digital conversion in analog-digital converter 140
During process, transmitting tube can light again, decrease the luminous waiting time of transmitting tube, that is, shorten the working cycle of transmitting tube,
Improve the work efficiency of infrared touch frame.
Wherein in an embodiment, as shown in figure 5, the signal receiving device of infrared touch frame may also comprise amplifier
150, capacitance 130 is connected with analog-digital converter 140 by amplifier.Amplifier 150 is used for coupled signal is amplified
Send after process to analog-digital converter 140.Coupled signal is amplified process, the conversion that can improve analog-digital converter 140 is accurate
Exactness.Amplifier 150 can be specifically the amplifying circuit set up by audion or the amplification set up by operational amplifier
Circuit.
Wherein in an embodiment, as shown in fig. 6, reception pipe 200, sampling component 110, analog switch 120 and every straight
The quantity of electric capacity 130 is identical and for multiple.The signal receiving device of infrared touch frame may also include multi-channel gating switch 160, adopts
Sample assembly 110 one end connects the outfan of a reception pipe 200 respectively, and the other end is all grounded.The input of analog switch 120 is respectively
Connect the common port of a sampling component 110 and reception pipe 200, the outfan of analog switch 120 connects a capacitance 130 respectively
One end, the other end of capacitance 130 connects an input of multi-channel gating switch 160 respectively.
Multi-channel gating switch 160 receives gate control signal by control end, and is selected by multichannel according to gate control signal
Open up the coupled signal of outfan output corresponding capacitance 130 conveying closing 160.Specifically, gate control signal and reception
The quantity of pipe 200 is correspondingly arranged, so that reception pipe 200 quantity is 8 as a example, when analog switch 120 turns on, gate control signal
For low level, multi-channel gating switch 160 does not work；When analog switch 120 turns off, gate control signal comprises 8 high level,
Control multi-channel gating switch 160 to control respective channel to sequentially turn on, be respectively connected to each road coupled signal.Using gate control signal
Control multi-channel gating switch 160 that multichannel coupled signal is carried out select with output, convenient and swift.
Exported using the coupled signal that multi-channel gating switch 160 sends to multiple capacitances 130 in the present embodiment
Control, output coupling signal is used for analog-to-digital conversion process it is achieved that carrying out signal sampling control to multiple reception pipes 200 one by one.
Pass through an analog switch 120 control circuit break-make respectively, output coupling signal carries out modulus and turns one by one in multi-channel gating switch 160
When changing process, the electric charge of each capacitance 130 storage discharges without going past corresponding sampling component 110, and transmitting tube is without lasting
Luminous, more notable to the effect reducing infrared touch frame power consumption.
Further, respective devices can be controlled in the present embodiment to work using the clock signal shown in Fig. 4, in multichannel choosing
When opening up pass 160 and being sequentially ingressed into each road coupled signal to analog-digital converter 140 and carry out analog digital conversion, sampling component 110 is right again
The current signal of reception pipe 200 output is sampled, and decreases the luminous waiting time of transmitting tube, to raising infrared touch frame work
The effect making efficiency is more notable.
Wherein in an embodiment, reception pipe 200 identical with the quantity of sampling component 110 and be multiple, sampling component
110 one end connect the outfan of a reception pipe 200 respectively, and the other end is all grounded.The input of analog switch 120 connects each sampling
Assembly 110 and the common port of reception pipe 200.By controlling the power supply single access successively of power access end VCC, make each reception pipe
200 conducting when only one of which reception pipe 200 output current signal to sampling component 110.Utilize a mould in the present embodiment
Intend the common port that switch 120 connects multiple sampling components 110 and reception pipe 200, realization carries out signal to multiple reception pipes 200 and adopts
Sample controls, and reduces production cost.
It is appreciated that signal sampling control is carried out to multiple reception pipes 200 using an analog switch 120, not can only
By controlling the power supply of power access end VCC, single access to be realized successively.As also can be by each sampling component 110 and reception pipe
200 common port passes through the input that a gating circuit connects analog switch 120, controls gating circuit to divide using control signal
Do not access each sampling component 110 and sample the signal obtaining to analog switch 120.The concrete structure of gating circuit is not unique, only
No pressure drop need to be met turn on.
With continued reference to Fig. 6, the signal receiving device of infrared touch frame may also include control module 170, and control module 170 is even
Connect the control end of analog switch 120, for the work schedule signal generation switching sequence signal being lighted according to control transmitting tube, and
Send to the control end of analog switch 120.Control module 170 can be the direct controller using generation work schedule signal,
According to generation switching sequence signal after work schedule signal generation switching sequence signal or cut-in operation clock signal.
Control module 170 also can connect analog-digital converter 140 and multi-channel gating switch 160, is respectively used to as analog-digital converter 140 and many
Road gating switch 160 provides conversion timing sequence signal and gate control signal.
It is appreciated that in other embodiments, the signal receiving device of infrared touch frame also may not include control module
170, by external control device be analog switch 120, analog-digital converter 140 and multi-channel gating switch 160 corresponding control is provided
Signal.
Wherein in an embodiment, the signal receiving device of infrared touch frame can include analog-digital converter 140 He simultaneously
Control module 170, and analog-digital converter 140 and control module 170 can utilize MCU to provide corresponding control based on MCU realization
Signal, and complete the analog digital conversion of coupled signal.
Embodiment described above only have expressed the several embodiments of the present invention, and its description is more concrete and detailed, but simultaneously
Therefore the restriction to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, some deformation can also be made and improve, these broadly fall into the guarantor of the present invention
Shield scope.Therefore, the protection domain of patent of the present invention should be defined by claims.
Claims (8)
1. a kind of signal receiving device of infrared touch frame is it is characterised in that include：
Sampling component, one end connects the outfan of the reception pipe of infrared touch frame, and the other end is grounded；
Analog switch, input connects the common port of described sampling component and reception pipe, default for being received by control end
Switching sequence signal, and turned on after the transmitting tube of described infrared touch frame lights according to the control of described switching sequence signal,
And turn off when described transmitting tube does not light；
Capacitance, one end connects the outfan of described analog switch, for the signal accessing when described analog switch is turned on
Coupled and filtered, obtain coupled signal and export from the other end；
Described analog switch, is additionally operable to when the coupled signal that described capacitance is exported carries out analog-to-digital conversion process according to institute
The control stating switching sequence signal turns on after luminous in the transmitting tube of described infrared touch frame, and does not light in described transmitting tube
When turn off.
2. infrared touch frame according to claim 1 signal receiving device it is characterised in that described analog switch according to
The control of described switching sequence signal, when described transmitting tube lights, turned on after default time delay, and at described
Penetrate when pipe does not light and turn off.
3. the signal receiving device of infrared touch frame according to claim 1 is opened it is characterised in that also including multi channel selecting
Close, described reception pipe, sampling component, analog switch are identical with the quantity of capacitance and for multiple；
Described sampling component one end connects the outfan of reception pipe described in respectively, and the other end is all grounded；
The input of described analog switch connects the common port of sampling component described in one and reception pipe respectively, described analog switch
Outfan connects one end of capacitance described in respectively, and the other end of described capacitance connects described multi channel selecting respectively and opens
The input closing；
Described multi-channel gating switch receives gate control signal by control end, and according to described gate control signal, it is right to select
The coupled signal answering capacitance conveying is exported by outfan.
4. the signal receiving device of infrared touch frame according to claim 1 is it is characterised in that described reception pipe and sampling
The quantity of assembly is identical and for multiple, and described sampling component one end connects the outfan of reception pipe described in respectively, and the other end is equal
Ground connection；
The input of described analog switch connects the common port of each described sampling component and reception pipe.
5. the signal receiving device of infrared touch frame according to claim 1 is it is characterised in that also include analog digital conversion
Device, described analog-digital converter connects the other end of described capacitance, and described analog-digital converter receives conversion timing sequence signal, and root
According to described conversion timing sequence signal control when described analog switch turns off, analog digital conversion is carried out to described coupled signal.
6. the signal receiving device of infrared touch frame according to claim 5 is it is characterised in that also include amplifier, institute
State capacitance to be connected with described analog-digital converter by described amplifier, described amplifier is used for described coupled signal is carried out
Send after processing and amplifying to described analog-digital converter.
7. the signal receiving device of infrared touch frame according to claim 1 is it is characterised in that also include control module,
Described control module connects the control end of described analog switch, for according to the work schedule signal controlling described transmitting tube to light
Generate described switching sequence signal, and send to the control end of described analog switch.
8. the signal receiving device of the infrared touch frame according to claim 1 to 7 any one is it is characterised in that described
Analog switch is 4501 chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310629420.1A CN103631453B (en) | 2013-11-29 | 2013-11-29 | signal receiving device of infrared touch frame |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310629420.1A CN103631453B (en) | 2013-11-29 | 2013-11-29 | signal receiving device of infrared touch frame |
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| Publication Number | Publication Date |
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| CN103631453A CN103631453A (en) | 2014-03-12 |
| CN103631453B true CN103631453B (en) | 2017-03-01 |
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| CN201310629420.1A Active CN103631453B (en) | 2013-11-29 | 2013-11-29 | signal receiving device of infrared touch frame |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109787566A (en) * | 2019-03-11 | 2019-05-21 | 广州华欣电子科技有限公司 | A kind of infrared signal amplifying circuit, processing circuit and infrared touch panel |
| CN110166051B (en) * | 2019-06-27 | 2023-03-31 | 深圳市康冠商用科技有限公司 | Multi-path sampling circuit, infrared touch frame and multi-path sampling method of infrared touch frame |
| CN116719436B (en) * | 2022-06-30 | 2024-08-09 | 广州众远智慧科技有限公司 | Sampling control method, control device, processor and sampling system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7030860B1 (en) * | 1999-10-08 | 2006-04-18 | Synaptics Incorporated | Flexible transparent touch sensing system for electronic devices |
| CN2932828Y (en) * | 2005-10-26 | 2007-08-08 | 深圳Tcl新技术有限公司 | An infrared-based display equipment control device |
| CN101556521B (en) * | 2008-04-08 | 2012-01-11 | 北京汇冠新技术股份有限公司 | Photo-electric signal receiving circuit used for an infrared touch screen |
| CN103324363B (en) * | 2013-07-15 | 2016-08-10 | 广州视睿电子科技有限公司 | Photoelectric signal processing device and infrared touch screen |
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