CN209015118U - A kind of infrared signal receiving circuit, processing circuit and infrared touch panel - Google Patents
A kind of infrared signal receiving circuit, processing circuit and infrared touch panel Download PDFInfo
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- CN209015118U CN209015118U CN201821946801.7U CN201821946801U CN209015118U CN 209015118 U CN209015118 U CN 209015118U CN 201821946801 U CN201821946801 U CN 201821946801U CN 209015118 U CN209015118 U CN 209015118U
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Abstract
The utility model discloses a kind of infrared signal receiving circuits, comprising: photodiode, amplifier tube, power voltage supply port, voltage source port, first resistor, second resistance and the voltage detection signal port for voltage detection signal to be output to processing circuit；The cathode of photodiode is connect with voltage source port, and the anode of photodiode and the controlled end of amplifier tube connect；The input terminal of amplifier tube is connect with power voltage supply port, and the output end of amplifier tube is grounded by second resistance；The first end of first resistor is connected between the output end of amplifier tube and first resistor, the second end ground connection of first resistor；The connection of the first end of voltage detection signal output end and first resistor；The resistance value of the resistance value ratio second resistance of first resistor is small, and the invention also discloses a kind of infrared signal processing circuit and a kind of infrared touch panels.It is too long to solve the infrared signal reaction time using multiple embodiments, so that sensitivity of touch screen is poor, the bad problem of user experience.
Description
Technical field
The utility model relates to field of photoelectric technology more particularly to a kind of infrared signal receiving circuits, processing circuit and red
Outer touch screen.
Background technique
With the development of science and technology, requirement of the people to electronic product is continuously improved, and touch-screen applications are very extensive, especially
It is infrared touch panel, is the infrared signal receiving circuit of the prior art referring to Fig. 1, connects in the signal of existing infrared touch panel
It receives the quick tube cathode of circuit mid-infrared light and is connected to control unit, control unit output high level provides reverse-biased for infrared photodiode
It sets.
In actual operation, due to the characteristic of infrared photodiode, control unit needs to shift to an earlier date a period of time output high level,
The time is usually 20~50us, and it is too long to easily cause the infrared signal response time, so that sensitivity of touch screen is poor, is used
Family experience is bad.
Summary of the invention
The purpose of the utility model embodiment is to provide a kind of infrared signal receiving circuit, processing circuit and infrared touch
Screen, it is too long to have can effectively solve the infrared signal reaction time, so that sensitivity of touch screen is poor, user experience is bad to be asked
Topic.
To achieve the above object, the utility model embodiment provides a kind of infrared signal receiving circuit, comprising: photosensitive two
Pole pipe, amplifier tube, power voltage supply port, voltage source port, first resistor, second resistance and for by voltage detection signal it is defeated
The voltage detection signal port of processing circuit is arrived out；
The cathode of the photodiode is connect with the voltage source port, and the anode of the photodiode is put with described
The controlled end connection of big pipe；The input terminal of the amplifier tube is connect with the power voltage supply port, the output end of the amplifier tube
It is grounded by the second resistance；
The first end of the first resistor is connected between the output end of the amplifier tube and the second resistance, and described
The second end of one resistance is grounded；The voltage detection signal port is connect with the first end of the first resistor；
Wherein, the resistance value of second resistance described in the resistance value ratio of the first resistor is small.
Further, infrared signal receiving circuit further includes the switching circuit for being controlled by corresponding control circuit, institute
The input terminal for stating switching circuit is connected between the output end and second resistance of the amplifier tube, the output end of the switching circuit
It is connect with the first end of first resistor.
Further, the switching circuit includes the analog switch for being controlled by the control circuit, and the simulation is opened
The input terminal of pass is connected between the output end of the amplifier tube and the second resistance, the output end of the analog switch and institute
State the first end connection of first resistor.
Further, infrared signal receiving circuit further include: 3rd resistor, the first end of the 3rd resistor and photosensitive two
The cathode of pole pipe connects, and the second end of the 3rd resistor and the anode of photodiode connect.
Further, the resistance level of the first resistor is Ω rank, and the resistance level of the second resistance is K Ω grades
Not.
Further, the amplifier tube is NPN type triode, and the input terminal of the amplifier tube is collector, the amplification
The output end of pipe is emitter, and the controlled end of the amplifier tube is base stage.
Compared with prior art, the infrared signal receiving circuit disclosed in the utility model embodiment, by will be photosensitive
The cathode of diode is connect with the voltage source port, and the controlled end of the anode of the photodiode and the amplifier tube connects
It connects；The input terminal of the amplifier tube is connect with the power voltage supply port, and the output end of the amplifier tube passes through second electricity
Resistance ground connection；The first end of the first resistor is connected between the output end of the amplifier tube and the second resistance, and described
The second end of one resistance is grounded；The voltage detection signal port is connect with the first end of the first resistor, in this way, when described
When photodiode receives infrared signal, infrared signal can be converted to electric current, and electric current is amplified by amplifier tube, due to
The resistance value of second resistance is greater than first resistor, therefore amplified electric current preferentially flows to first resistor, and in the electricity of first resistor
Circulation is changed under the action of voltage finally in voltage detection signal port voltage sense signal.It can be seen that the utility model
Embodiment is by allowing the cathode of photodiode to connect voltage source port, so that photodiode works in reverse-biased die pressing type
Under, switching speed with higher, while improving the sensitivity of photodiode and then shortening its response time, to contract
The short response time of infrared signal.Also, second resistance is accelerating resistor, can accelerate the conducting of amplifier tube, so as to
Shorten circuit for the response time of infrared signal.Therefore, sensitivity of touch screen and anti-can be improved in the utility model embodiment
Speed is answered, so as to improve user experience.
The utility model embodiment additionally provide a kind of infrared signal processing circuit, including operational amplifier circuit, processing circuit with
And the infrared signal receiving circuit；
The input terminal of the operational amplifier circuit is connect with the voltage detection signal port, the output end of the operational amplifier circuit with
The processing circuit connection.
Further, the infrared signal processing circuit further includes control circuit and switching circuit；
The control terminal of the control circuit is connect with the controlled ports of the switching circuit, the controlled end of the switching circuit
It is connected between the output end of the amplifier tube and the second resistance, the output end of the switching circuit and the first resistor
Connection.
Further, the switching circuit includes the analog switch for being controlled by the control circuit；
The control terminal of the control circuit is connect with the controlled ports of the analog switch, the input terminal of the analog switch
It is connected between the output end of the amplifier tube and the second resistance, the output end of the analog switch and the first resistor
First end connection.
Compared with prior art, a kind of infrared signal processing circuit disclosed in the utility model embodiment, when photosensitive tube two
Pole pipe receives infrared signal, voltage detection signal port meeting voltage sense signal, and is amplified by the operational amplifier circuit,
Amplified voltage detection signal is sent to processing circuit and is handled, to finally judge institute according to the voltage detection signal
State whether photodiode receives infrared signal.In the utility model embodiment, due to the infrared signal processing circuit
Using above-mentioned infrared signal receiving circuit, the reaction time of infrared signal is shortened, so that sensitivity of touch screen enhances,
Promote user experience.
The utility model embodiment additionally provides a kind of infrared touch panel, including the infrared signal processing circuit.
Compared with prior art, the infrared touch panel disclosed in the utility model embodiment, it is above-mentioned red due to using
External signal processing circuit shortens the reaction time of infrared signal, so that sensitivity of touch screen enhances, promotes user's body
It tests.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of infrared signal receiving circuit in the prior art；
Fig. 2 is a kind of structural schematic diagram of infrared signal receiving circuit in the utility model embodiment；
Fig. 3 is a kind of structural schematic diagram of infrared signal processing circuit in the utility model embodiment.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without creative efforts
Every other embodiment obtained, fall within the protection scope of the utility model.
Embodiment one:
It referring to fig. 2, is a kind of structural schematic diagram for infrared signal receiving circuit that the utility model embodiment 1 provides.One
Kind infrared signal receiving circuit, comprising: photodiode REV1, amplifier tube Q1, power voltage supply port VCC1, voltage source port
VCCR, first resistor R1, second resistance R2 and the voltage detection signal for voltage detection signal to be output to processing circuit
Port Vout；
The cathode of the photodiode REV1 is connect with the voltage source port VCCR, the photodiode REV1's
Anode is connect with the controlled end of the amplifier tube Q1；The input terminal of the amplifier tube Q1 and the power voltage supply port VCC1 connect
It connects, the output end of the amplifier tube Q1 is grounded by the second resistance R2；
The first end of the first resistor R1 is connected between the output end of the amplifier tube Q1 and the first resistor R1,
The second end of the first resistor R1 is grounded；The first end of the voltage detection signal port Vout and first resistor R1 connects
It connects；
Wherein, the resistance value of second resistance R2 described in the resistance value ratio of the first resistor R1 is small.
The working principle of the utility model embodiment one are as follows:
When the photodiode REV1 receives infrared signal, infrared signal can be converted to electric current, and electric current is logical
It crosses amplifier tube Q1 to be amplified, since the resistance value of second resistance R2 is greater than first resistor R1, amplified electric current is preferentially flowed to
First resistor R1, and finally exported in voltage detection signal port Vout under the action of the electric current of first resistor R1 converts voltage
Voltage detection signal.It can be seen that the utility model embodiment is by allowing the cathode of photodiode REV1 to connect voltage source
Mouth VCCR, so that photodiode REV1 is worked under reverse-biased die pressing type, and switching speed with higher improves simultaneously
The sensitivity of photodiode REV1 shortens its response time in turn, so as to shorten the response time of infrared signal.Also,
Second resistance R2 is accelerating resistor, can accelerate the conducting of amplifier tube Q1, so as to shorten circuit for the sound of infrared signal
Between seasonable.Therefore, sensitivity of touch screen and reaction speed can be improved in the utility model embodiment, uses body so as to improve user
It tests.
Further, infrared signal receiving circuit further includes the switching circuit SW1 for being controlled by corresponding control circuit,
The input terminal of the switching circuit SW1 is connected between the output end and second resistance R2 of the amplifier tube Q1, the switch electricity
The output end of road SW1 is connect with the first end of first resistor R1.
Further, the switching circuit SW1 includes the analog switch for being controlled by the control circuit, the simulation
The input terminal of switch is connected between the output end of the amplifier tube Q1 and the second resistance R2, the output of the analog switch
End is connect with the first end of the first resistor R1.It should be noted that when photodiode REV1 receives infrared signal,
Infrared signal is converted to electric current by the analog switch closure of control circuit control simultaneously, photodiode REV1, and electric current flows through simulation
Switch；When photodiode REV1 does not receive infrared signal, analog switch is disconnected.Switching circuit SW1 is mould in the present embodiment
Quasi- switch, but switching circuit SW1 is not limited to analog switch, can also be thyristor, triode etc..
Further, in this embodiment amplifier tube Q1 is NPN type triode, the input terminal of the amplifier tube Q1 is current collection
The collector of pole, triode connects power voltage supply port VCC1, and power voltage supply port VCC1 is directly connected to the second voltage source, described
The output end of amplifier tube Q1 is emitter, and the controlled end of the amplifier tube Q1 is base stage.It should be noted that the amplifier tube Q1
It can also be other types, such as metal-oxide-semiconductor etc. is not specifically limited herein.
It should be noted that the voltage source port VCCR connection first voltage source that the cathode of photodiode REV1 connects,
When photodiode REV1 receives infrared signal, infrared signal is converted into electric current, triode ON, electric current passes through triode
It amplifies, the electric current after being amplified is flowed out from the emitter of triode, while analog switch is closed, due to second resistance R2's
Resistance value is greater than first resistor R1, and electric current preferentially passes through analog switch and flow through from first resistor R1, accelerates the conducting of triode, the
Finally in voltage detection signal port Vout1 voltage sense signal under the action of the electric current conversion voltage of one resistance R1, add
The conducting speed of fast amplifier tube Q1, shortens the reaction time of infrared signal.
Since the voltage source port VCCR connecting with the cathode of photodiode REV1 has been directly connected to first voltage source, make
It obtains photodiode REV1 to work under reverse-biased die pressing type, switching speed with higher, while improving photodiode
The sensitivity of REV1 and its response time is shortened, to improve sensitivity of touch screen and reaction speed, and then improves user
Usage experience.
Further, infrared signal receiving circuit further include: 3rd resistor R3, the first end and light of the 3rd resistor R3
The cathode of quick diode REV1 connects, and the second end of the 3rd resistor R3 is connect with the anode of photodiode REV1.
In the present embodiment, when photodiode REV1 receives infrared signal, infrared signal is converted into electric current, due to
The both ends photodiode REV1 are parallel with 3rd resistor R3, and 3rd resistor R3 can provide a bias current for triode, accelerate
The conducting of triode, triode amplify the electric current flowed through, and the electric current after being amplified is flowed out from the emitter of triode, together
When be closed analog switch, due to second resistance R2 resistance value be greater than first resistor R1 so that electric current by analog switch preferentially from
First resistor R1 flows through, and electric current is converted into voltage, since the cathode of photodiode REV1 and the first end of 3rd resistor R3 connect
It connects, the anode of photodiode REV1 is connect with the second end of 3rd resistor R3, and 3rd resistor R3 can provide one for triode
Bias current shortens the response time of infrared signal to improve the conducting speed of triode.
Further, the resistance level of the first resistor R1 is Ω rank, and the resistance level of the second resistance R2 is K
Ω rank.
It should be noted that the resistance level of second resistance R2 is K Ω rank, the resistance of first resistor R1 in the present embodiment
Value rank is Ω rank.When electric current is amplified by triode, from emitter outflow, since the resistance level of second resistance R2 is
K Ω rank, and the resistance level of first resistor R1 is Ω rank, electric current can preferentially be flowed out from first resistor R1, accelerate three
The conducting of pole pipe is more conducive to the quick amplification of electric current.
Embodiment two:
It is a kind of structural schematic diagram of infrared signal processing circuit provided by the embodiment of the utility model referring to Fig. 3.This reality
The infrared signal processing circuit provided with new embodiment, including one institute of operational amplifier circuit 2, processing circuit 3 and embodiment
The infrared signal receiving circuit stated；
The input terminal of the operational amplifier circuit 2 is connect with the voltage detection signal port Vout1, the operational amplifier circuit 2
Output end is connect with the processing circuit 3.
The working principle of the utility model embodiment two:
When photosensitive tube diode receives infrared signal, voltage detection signal port Vout1 understands voltage sense signal,
And amplified by the operational amplifier circuit, amplified voltage detection signal is sent to processing circuit and is handled, thus final root
Judge whether the photodiode receives infrared signal according to the voltage detection signal.In the utility model embodiment,
Since the infrared signal processing circuit uses above-mentioned infrared signal receiving circuit, the reaction time of infrared signal is shortened,
So that sensitivity of touch screen enhances, user experience is promoted.
Further, the infrared signal processing circuit further includes control circuit 1 and switching circuit SW1；
The control terminal of the control circuit 1 is connect with the controlled ports Vout2 of the switching circuit SW1, the switch electricity
The input terminal of road SW1 is connected between the output end of the amplifier tube Q1 and the second resistance R2, the switching circuit SW1's
Output end is connect with the first resistor R1.
Further, the switching circuit SW1 includes the analog switch for being controlled by the control circuit；The control
The control terminal of circuit is connect with the controlled ports Vout2 of the analog switch, and the input terminal of the analog switch is connected to described
Between the output end of amplifier tube Q1 and the second resistance R2, the of the output end of the analog switch and the first resistor R1
One end connection.It should be noted that when photodiode REV1 receives infrared signal, while the control simulation of control circuit 1
It closes the switch, infrared signal is converted to electric current by photodiode REV1, and electric current flows through analog switch；As photodiode REV1
When not receiving infrared signal, analog switch is disconnected.
It should be noted that in the present embodiment, when photodiode REV1 receives infrared signal, photodiode REV1
Infrared signal is converted into electric current, while control circuit 1 controls analog switch closure, since the resistance value of second resistance R2 is greater than the
One resistance R1, electric current preferentially flow through first resistor R1 by analog switch, accelerate amplifier tube Q1 conducting, and first resistor R1 is by electric current
It being converted to voltage and operational amplifier circuit 2 is transmitted to by voltage detection signal port Vout1, operational amplifier circuit 2 amplifies voltage, then
Processing circuit 3 is transmitted to be handled.To finally judge that the photodiode REV1 is according to the voltage detection signal
It is no to receive infrared signal.In the utility model embodiment, since the infrared signal processing circuit is using above-mentioned infrared
Signal receiving circuit shortens the reaction time of infrared signal, so that sensitivity of touch screen enhances, promotes user experience.
Embodiment three:
The utility model embodiment provides a kind of infrared touch panel, including the infrared signal processing circuit.
Compared with prior art, the infrared touch panel disclosed in the utility model embodiment, it is above-mentioned red due to using
External signal processing circuit, shortens the reaction time of infrared signal, the amplification effect of infrared signal more preferably so that touch screen
Sensitivity enhancing, promotes user experience.
The above is preferred embodiments of the present invention, it is noted that for the ordinary skill of the art
For personnel, without departing from the principle of this utility model, several improvements and modifications can also be made, these are improved and profit
Decorations are also considered as the protection scope of the utility model.
Claims (10)
1. a kind of infrared signal receiving circuit characterized by comprising photodiode, amplifier tube, power voltage supply port, electricity
Potential source port, first resistor, second resistance and the voltage detection signal for voltage detection signal to be output to processing circuit
Port；
The cathode of the photodiode is connect with the voltage source port, the anode of the photodiode and the amplifier tube
Controlled end connection；The input terminal of the amplifier tube is connect with the power voltage supply port, and the output end of the amplifier tube passes through
The second resistance ground connection；
The first end of the first resistor is connected between the output end of the amplifier tube and the second resistance, first electricity
The second end of resistance is grounded；The voltage detection signal port is connect with the first end of the first resistor；
Wherein, the resistance value of second resistance described in the resistance value ratio of the first resistor is small.
2. infrared signal receiving circuit as described in claim 1, which is characterized in that further include for by corresponding control circuit
The switching circuit of control, the input terminal of the switching circuit are connected between the output end and second resistance of the amplifier tube, institute
The first end of the output end and first resistor of stating switching circuit connects.
3. infrared signal receiving circuit as claimed in claim 2, which is characterized in that the switching circuit includes for by described
The analog switch of control circuit control, the input terminal of the analog switch are connected to the output end and described second of the amplifier tube
Between resistance, the output end of the analog switch is connect with the first end of the first resistor.
4. infrared signal receiving circuit as described in claim 1, which is characterized in that further include: 3rd resistor, the third electricity
The first end of resistance and the cathode of photodiode connect, and the second end of the 3rd resistor and the anode of photodiode connect.
5. infrared signal receiving circuit as described in claim 1, which is characterized in that the resistance level of the first resistor is Ω
Rank, the resistance level of the second resistance are K Ω rank.
6. infrared signal receiving circuit as described in claim 1, which is characterized in that the amplifier tube is NPN type triode, institute
The input terminal for stating amplifier tube is collector, and the output end of the amplifier tube is emitter, and the controlled end of the amplifier tube is base stage.
7. a kind of infrared signal processing circuit, which is characterized in that including operational amplifier circuit, processing circuit and claim 1 to 6 times
One infrared signal receiving circuit；
The input terminal of the operational amplifier circuit is connect with the voltage detection signal port, the output end of the operational amplifier circuit with it is described
Processing circuit connection.
8. infrared signal processing circuit as claimed in claim 7, which is characterized in that the infrared signal processing circuit further includes
Control circuit and switching circuit；
The control terminal of the control circuit is connect with the controlled ports of the switching circuit, the input terminal connection of the switching circuit
Between the output end and the second resistance of the amplifier tube, the output end of the switching circuit and the first resistor connect
It connects.
9. infrared signal processing circuit as claimed in claim 8, which is characterized in that the switching circuit includes for by described
The analog switch of control circuit control；
The control terminal of the control circuit is connect with the controlled ports of the analog switch, the input terminal connection of the analog switch
Between the output end and the second resistance of the amplifier tube, the of the output end of the analog switch and the first resistor
One end connection.
10. a kind of infrared touch panel, which is characterized in that including any infrared signal processing circuit of claim 7 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821946801.7U CN209015118U (en) | 2018-11-23 | 2018-11-23 | A kind of infrared signal receiving circuit, processing circuit and infrared touch panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821946801.7U CN209015118U (en) | 2018-11-23 | 2018-11-23 | A kind of infrared signal receiving circuit, processing circuit and infrared touch panel |
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| Publication Number | Publication Date |
|---|---|
| CN209015118U true CN209015118U (en) | 2019-06-21 |
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ID=66842967
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821946801.7U Active CN209015118U (en) | 2018-11-23 | 2018-11-23 | A kind of infrared signal receiving circuit, processing circuit and infrared touch panel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110347296A (en) * | 2019-07-17 | 2019-10-18 | 广州华欣电子科技有限公司 | A kind of infrared touch panel and its signal processing circuit |
-
2018
- 2018-11-23 CN CN201821946801.7U patent/CN209015118U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110347296A (en) * | 2019-07-17 | 2019-10-18 | 广州华欣电子科技有限公司 | A kind of infrared touch panel and its signal processing circuit |
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