CN220819212U - Infrared signal processing circuit, infrared signal receiving system and touch screen - Google Patents
Infrared signal processing circuit, infrared signal receiving system and touch screen Download PDFInfo
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- CN220819212U CN220819212U CN202322336367.8U CN202322336367U CN220819212U CN 220819212 U CN220819212 U CN 220819212U CN 202322336367 U CN202322336367 U CN 202322336367U CN 220819212 U CN220819212 U CN 220819212U
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Abstract
The utility model relates to an infrared signal processing circuit, an infrared signal receiving system and a touch screen. The infrared signal processing circuit of the present utility model includes: the device comprises a signal input end, a first filter circuit, a bias voltage circuit, a bias filter circuit, an amplifying circuit, a second filter circuit and a signal output end; the signal input end is connected to the first input end of the amplifying circuit through the first filter circuit, the output end of the bias voltage circuit is connected to the first input end of the amplifying circuit through the bias filter circuit, the output end of the bias voltage circuit is connected to the second input end of the amplifying circuit, and the output end of the amplifying circuit is connected to the signal output end through the second filter circuit. The infrared signal processing circuit, the infrared signal receiving system and the touch screen have the advantages of effectively filtering ambient light interference signals, filtering bias voltage loaded by the bias voltage circuit and improving the working efficiency of the touch screen.
Description
Technical Field
The present utility model relates to the field of infrared detection, and in particular, to an infrared signal processing circuit, an infrared signal receiving system, and a touch screen.
Background
The infrared touch screen is characterized in that an infrared light emitting diode is used for emitting infrared light, the infrared light emitting diode is used for converting received infrared light into an electric signal, an MCU is used for collecting and processing the electric signal, and whether the infrared light is shielded by a touch object or not is judged by detecting the change of the collected signal, so that a touch function is realized.
Because the infrared photodiode converts infrared light into very weak electric signals, the electric signals can be normally collected by the MCU through amplification. Meanwhile, the infrared photodiode receives light emitted by the infrared light emitting diode and is easily interfered by sunlight, fluorescent lamps and other environmental light, so that after infrared light is converted into an electric signal, a signal processing circuit is very critical, weak analog signals need to be effectively amplified, and meanwhile, the interference of the environmental light needs to be effectively filtered.
In the current common amplifying circuit, as shown in fig. 1, a current signal output by a photodiode is converted into a voltage signal through a resistor R1, and then is directly connected to an input end of an operational amplifier for amplification. The amplifying circuit has the problems that weak signals output by the photodiode are easily submerged by noise and cannot be effectively amplified, and meanwhile, the signals are easily interfered by ambient light, so that abnormal touch functions are caused by inaccurate acquisition of the MCU.
Disclosure of utility model
Based on the above, the utility model aims to provide an infrared signal processing circuit, an infrared signal receiving system and a touch screen, which have the advantages of effectively filtering ambient light interference signals, filtering bias voltage loaded by a bias voltage circuit and improving the working efficiency of the touch screen.
An infrared signal processing circuit comprising: the device comprises a signal input end, a first filter circuit, a bias voltage circuit, a bias filter circuit, an amplifying circuit, a second filter circuit and a signal output end;
The signal input end is connected to the first input end of the amplifying circuit through the first filter circuit, the output end of the bias voltage circuit is connected to the first input end of the amplifying circuit through the bias filter circuit, the output end of the bias voltage circuit is connected to the second input end of the amplifying circuit, and the output end of the amplifying circuit is connected to the signal output end through the second filter circuit.
An infrared signal receiving system comprising: the infrared receiving device is connected with the controller through the infrared signal processing circuit.
The touch screen comprises an infrared emission device, a display screen and the infrared signal receiving system, wherein the infrared emission device sends an infrared signal to the infrared signal receiving device, the infrared emission device is connected with a controller, and the controller is connected with the display screen.
In the infrared signal processing circuit, an infrared signal passes through the signal input end and the first filter circuit, the infrared signal is loaded on a direct current level through the bias voltage circuit and is input to the first input end of the amplifying circuit, the output end of the bias voltage circuit is connected to the second input end of the amplifying circuit, and after receiving the infrared signal and the direct current voltage output by the bias voltage circuit, the amplifying circuit outputs an amplified signal, and the direct current voltage loaded by the bias voltage circuit is filtered by the second filter circuit and is output to the signal output end. The infrared signal processing circuit can effectively filter interference of sunlight, fluorescent lamps and other ambient light, filter direct-current voltage loaded by the bias voltage circuit and improve the scanning speed of the touch screen.
For a better understanding and implementation, the present utility model is described in detail below with reference to the drawings.
Drawings
FIG. 1 is a schematic diagram of an amplifying circuit according to the background art of the present application;
FIG. 2 is a block diagram of an infrared signal processing circuit in accordance with an embodiment of the present application;
Fig. 3 is a circuit diagram of an infrared signal processing circuit in a first embodiment of the application;
fig. 4 is a circuit schematic of an infrared signal processing circuit in a second embodiment of the application;
fig. 5 is a circuit diagram of an infrared signal processing circuit in a third embodiment of the application.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the utility model. Rather, they are merely examples of apparatus and methods consistent with aspects of the utility model as detailed in the accompanying claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the utility model. The word "if"/"if" as used herein may be interpreted as "at … …" or "at … …" or "in response to a determination", depending on the context.
Referring to fig. 2, fig. 2 is a block diagram illustrating an infrared signal processing circuit according to an embodiment of the application.
An infrared signal processing circuit comprising: a signal input 10, a first filter circuit 20, a bias voltage circuit 30, a bias filter circuit 40, an amplifying circuit 50, a second filter circuit 60, and a signal output 70.
The signal input 10 is connected to a first input of the amplifying circuit 50 via the first filter circuit 20, the bias voltage circuit 30 is connected to a first input of the amplifying circuit 50 via the bias filter circuit 40, and an output of the bias voltage circuit 30 is connected to a second input of the amplifying circuit 50, and an output of the amplifying circuit 50 is connected to the signal output 70 via the second filter circuit 60.
In the infrared signal processing circuit of the present application, an infrared signal passes through the signal input terminal 10 and the first filter circuit 20, the infrared signal is loaded on a dc level by the bias voltage circuit 30, and is input to the first input terminal of the amplifying circuit 50, and the output terminal of the bias voltage circuit 30 is connected to the second input terminal of the amplifying circuit 50, and after the amplifying circuit 50 receives the infrared signal and the dc voltage output by the bias voltage circuit, an amplified signal is output, and the dc voltage loaded by the bias voltage circuit is filtered by the second filter circuit 60, and the amplified infrared signal is output to the signal output terminal. The infrared signal processing circuit can effectively filter interference of sunlight, fluorescent lamps and other ambient light, and filter direct current voltage loaded by the bias voltage circuit.
The infrared signal processing circuit is mainly applied to the infrared touch screen, and the influence of interference signals is reduced by filtering and amplifying the infrared signals received by the infrared photodiodes. By adopting the infrared signal processing circuit, the lamp tube in the infrared touch screen can work at a faster switching frequency, so that the scanning speed of the infrared touch screen is improved. In addition, the infrared signal processing circuit has the advantages of simple structure and low application cost.
Example 1
Referring to fig. 3, fig. 3 is a schematic circuit diagram of an infrared signal processing circuit according to a first embodiment of the application.
The circuit diagram in this embodiment is constructed based on the circuit infrared signal processing circuit block diagram in embodiment 1. The first filter circuit 20 includes a first capacitor C1, where one end of the first capacitor C1 is connected to the signal input terminal 10, and the other end is connected to the first input terminal of the amplifying circuit 50. The first capacitor C1 is configured to perform filtering processing on the infrared signal, so as to reduce interference of ambient light such as sunlight and fluorescence.
In this embodiment, the first filter circuit 20 is not limited to be formed by the first capacitor C1, and in other embodiments, the first filter circuit 20 may further include other circuits that can implement a filtering function, such as a high-pass filter circuit.
The bias voltage circuit 30 includes a dc power source VCC, a first resistor R1, and a second resistor R2, where the dc power source VCC is grounded through the first resistor R1 and the second resistor R2, and an output end of the bias voltage circuit is connected between the first resistor R1 and the second resistor R2. In this embodiment, the dc power supply VCC is connected to the second input terminal of the amplifying circuit 50 through the first resistor R1, and the dc power supply VCC is connected to the first input terminal of the amplifying circuit 50 through the first resistor R1 and the bias filter circuit 40. The infrared signal is loaded to a direct current level by the bias voltage circuit so that the infrared signal can be amplified by the amplifying circuit 50.
It should be noted that, in the present embodiment, the bias voltage circuit 30 is configured by the dc power source VCC, the first resistor R1 and the second resistor R2, but it is not merely representative that the bias voltage circuit 30 in the present embodiment is configured by the dc power source VCC, the first resistor R1 and the second resistor R2, and other circuits that can be used to improve the stable dc voltage signal can be applied to the bias voltage circuit 30 in the present application.
The bias filter circuit 40 includes a sixth resistor R6, where one end of the sixth resistor R6 is connected between the first filter circuit 20 and the first input terminal of the amplifying circuit 50, and the other end is connected between the bias voltage circuit 30 and the second input terminal of the amplifying circuit 50. In this embodiment, one end of the sixth resistor R6 is connected between the first capacitor C1 and the first input terminal of the amplifying circuit 50, and the other end is connected between the first resistor R1 and the second input terminal of the amplifying circuit. The bias filter circuit 40 is mainly configured to provide a bias voltage to the first input terminal of the amplifying circuit 50, so as to ensure that the bias voltages input to the first input terminal and the second input terminal of the amplifying circuit 50 are the same, and the bias filter circuit 40 may further form a high-pass filter circuit with the first capacitor C1. In the present embodiment, the bias filter circuit 40 is formed by the sixth resistor R6, and in other embodiments, the bias filter circuit 40 may be formed by a plurality of resistors connected in series.
The amplifying circuit 50 includes an operational amplifier U1A, a third resistor R3 and a fourth resistor R4, wherein the fourth resistor R4 is connected between an inverting input terminal and an output terminal of the operational amplifier U1A, one end of the third resistor R3 is connected between the inverting input terminal of the operational amplifier U1A and the fourth resistor R4, a first input terminal of the amplifying circuit 50 is connected to a non-inverting input terminal of the operational amplifier U1A, and a second input terminal of the amplifying circuit 50 is connected to the other end of the third resistor R3.
Further, the amplifying circuit 50 further includes a fifth resistor R5, a second capacitor C2, and a third capacitor C3, where the first input end of the amplifying circuit 50 is connected to the non-inverting input end of the operational amplifier U1A through the fifth resistor R5, the third capacitor C3 is connected in parallel with the fourth resistor R4, and one end of the second capacitor C2 is connected between the bias voltage circuit 30 and the second input end of the amplifying circuit 50, and the other end is grounded.
In this embodiment, the signal input terminal 10 inputs an infrared signal to the non-inverting input terminal of the operational amplifier U1A through the first capacitor C1 and the fifth resistor R5, the dc power VCC is connected between the first capacitor C1 and the fifth resistor R5 through the first resistor R1 and the sixth resistor R6, and one end of the second capacitor C2 is connected between the first resistor R1 and the third resistor R3, and the other end is grounded. The second capacitor C2 is used for enabling the op-amp to amplify only the ac signal, and not amplify the dc bias voltage, and the third capacitor C3 and the fifth resistor R5 are used for protecting the circuit.
In this embodiment, the operational amplifier U1A is used to construct an in-phase amplifying circuit for amplifying the infrared signal with the bias voltage, so as to improve the accuracy of amplifying the signal. It should be noted that the amplifying circuit 50 in the present application is not limited to the above embodiment, and other amplifying circuits that can perform the amplifying function are also applicable to the present application, for example, an inverting amplifying circuit or the like.
In this embodiment, the second filter circuit 60 is a high-pass filter circuit, the second filter circuit 60 includes a fourth capacitor C4 and a seventh resistor R7, one end of the fourth capacitor C4 is connected to the output end of the amplifying circuit 50, the other end is connected to the signal output end 70, one end of the seventh resistor R7 is connected between the fourth capacitor C4 and the signal output end, and the other end is grounded. In this embodiment, one end of the fourth capacitor C4 is connected to the output end of the operational amplifier U1A in the amplifying circuit 50, and the other end is connected to the signal output end 70. The second filter circuit 60 is configured to filter the amplified signal output by the amplifying circuit 50, and further filter the dc level loaded in front to obtain an effectively amplified infrared amplified signal.
Note that, in the present embodiment, the second filter circuit 60 is formed by the fourth capacitor C4 and the seventh resistor R7, but it is not merely representative that the second filter circuit 60 in the present embodiment is formed by the fourth capacitor C4 and the seventh resistor R7, and other filter circuits that can be used to implement the filtering function can be applied to the second filter circuit 60 in the present application.
Further, an eighth resistor R8 is further included, and the eighth resistor R8 is connected between the output end of the amplifying circuit 50 and the second filtering circuit 60. In one embodiment, the eighth resistor R8 is connected between the output terminal of the operational amplifier U1A and the fourth capacitor C4.
In the infrared signal processing circuit of the present application, an infrared signal is applied to a dc level by the bias voltage circuit 30 composed of the dc power VCC, the first resistor R1 and the second resistor R2 through the sixth resistor R6, the infrared signal is input to the first input terminal of the amplifying circuit 50, i.e., the non-inverting input terminal of the operational amplifier U1A, and the output terminal of the bias voltage circuit 30 is connected to the second input terminal of the amplifying circuit 50, i.e., the inverting input terminal of the operational amplifier U1A, and the amplifying circuit 50 receives the infrared signal and the dc voltage output by the bias voltage circuit and outputs an amplified signal to the signal output terminal by filtering the dc voltage applied by the bias voltage circuit through the second filter circuit 60. The infrared signal processing circuit can effectively filter interference of sunlight, fluorescent lamps and other ambient light, filter direct-current voltage loaded by the bias voltage circuit and improve the scanning speed of the touch screen. The infrared signal processing circuit is simple in structure and low in application cost.
Example 2
Referring to fig. 4, fig. 4 is a schematic circuit diagram of an infrared signal processing circuit according to a second embodiment of the application.
The main difference of this embodiment compared to embodiment 1 is that the bias voltage circuit 30 includes a first bias voltage circuit 31 and a second bias voltage circuit 32.
The first bias voltage circuit 31 includes a first dc power supply V1, a ninth resistor R9, and a tenth resistor R10, where the first dc power supply V1 is grounded through the ninth resistor R9 and the tenth resistor R10, and the first dc power supply V1 is connected to the second input end of the amplifying circuit 50 through the ninth resistor R9, that is, the first dc power supply V1 is connected to the inverting input end of the operational amplifier U1A through the ninth resistor R9 and the third resistor R3.
The second bias voltage circuit 32 includes a second dc power supply V2, an eleventh resistor R11, and a twelfth resistor R12, where the second dc power supply V2 is grounded through the eleventh resistor R11 and the twelfth resistor R12, and the second dc power supply V2 is connected to the first input terminal of the amplifying circuit 50 through the eleventh resistor R11 and the bias filter circuit 40, that is, the second dc power supply V2 is connected between the first capacitor C1 and the fifth resistor R5 through the eleventh resistor R11 and the sixth resistor R6.
In this embodiment, the first bias voltage circuit 31 and the second bias voltage circuit 32 respectively provide the same dc voltage to the two input terminals of the amplifying circuit 50, so as to ensure the stable operation of the circuits.
Example 3
Referring to fig. 5, fig. 5 is a schematic circuit diagram of an infrared signal processing circuit according to a third embodiment of the application.
Compared to embodiment 1, the main difference of this embodiment is that the amplifying circuit 50 includes an operational amplifier U1A, a third resistor R3 and a fourth resistor R4, wherein the fourth resistor R4 is connected between the inverting input terminal and the output terminal of the operational amplifier U1A, one end of the third resistor R3 is connected between the inverting input terminal of the operational amplifier U1A and the fourth resistor R4, the second input terminal of the amplifying circuit 50 is connected to the non-inverting input terminal of the operational amplifier U1A, and the first input terminal of the amplifying circuit 50 is connected to the other end of the third resistor R3.
Further, the amplifying circuit 50 further includes a fifth resistor R5, a second capacitor C2, and a third capacitor C3, where the second input end of the amplifying circuit 50 is connected to the non-inverting input end of the operational amplifier U1A through the fifth resistor R5, the third capacitor C3 is connected in parallel with the fourth resistor R4, and one end of the second capacitor C2 is connected between the bias voltage circuit 30 and the second input end of the amplifying circuit 50, and the other end is grounded.
It will be appreciated that in the present embodiment, the signal input terminal 10 is connected to the inverting input terminal of the operational amplifier U1A through the first capacitor C1 and the fourth resistor R4, and the dc power supply VCC is connected to the non-inverting input terminal of the operational amplifier U1A through the first resistor R1 and the fifth resistor R5 in the bias voltage circuit 30, and the dc power supply VCC is connected between the first capacitor and the fourth capacitor through the first resistor R1 and the sixth resistor R6.
In this embodiment, the amplifying circuit 50 employs an inverting amplifying circuit, and the infrared signal is input to the inverting input terminal of the operational amplifier U1A in the amplifying circuit 50 for amplification after the dc voltage of the bias voltage circuit is applied. In this embodiment, an inverting amplifier circuit is used, and the infrared signal can be amplified effectively as well.
The application also provides an infrared signal receiving system, which comprises: the infrared signal processing circuit of any one of the above embodiments, the infrared signal processing circuit is configured to receive the infrared signal from the infrared receiver.
A touch screen, comprising: the infrared transmitting device transmits an infrared signal to the infrared signal receiving device, the infrared transmitting device is connected with the controller, and the controller is connected with the display screen.
In the application, the infrared signal receiving system formed by the infrared signal processing circuit is used for the touch screen, so that the light interference resistance of the touch screen is improved, meanwhile, the lamp tube of the touch screen can work at a faster switching frequency, and the scanning speed of the touch screen is improved.
The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model.
Claims (10)
1. An infrared signal processing circuit, comprising: the device comprises a signal input end, a first filter circuit, a bias voltage circuit, a bias filter circuit, an amplifying circuit, a second filter circuit and a signal output end;
The signal input end is connected to the first input end of the amplifying circuit through the first filter circuit, the output end of the bias voltage circuit is connected to the first input end of the amplifying circuit through the bias filter circuit, the output end of the bias voltage circuit is connected to the second input end of the amplifying circuit, and the output end of the amplifying circuit is connected to the signal output end through the second filter circuit.
2. The infrared signal processing circuit as recited in claim 1, wherein the first filter circuit comprises a first capacitor having one end connected to the signal input and the other end connected to the first input of the amplifying circuit.
3. The infrared signal processing circuit as recited in claim 1, wherein the bias voltage circuit comprises a dc power supply, a first resistor and a second resistor, the dc power supply being coupled to ground through the first resistor and the second resistor, the output of the bias voltage circuit being coupled between the first resistor and the second resistor.
4. The infrared signal processing circuit as defined in claim 1, wherein the bias filter circuit comprises a sixth resistor having one end connected between the first filter circuit and the first input of the amplifying circuit and another end connected between the bias voltage circuit and the second input of the amplifying circuit.
5. The infrared signal processing circuit of claim 1, wherein the amplifying circuit comprises an operational amplifier, a third resistor, and a fourth resistor;
the fourth resistor is connected between the inverting input end and the output end of the operational amplifier, and one end of the third resistor is connected between the fourth resistor and the inverting input end of the operational amplifier;
The first input end of the amplifying circuit is connected with the non-inverting input end of the operational amplifier, and the second input end of the amplifying circuit is connected with the other end of the third resistor; or the first input end of the amplifying circuit is connected to the other end of the third resistor, and the second input end of the amplifying circuit is connected to the non-inverting input end of the operational amplifier.
6. The infrared signal processing circuit as defined in claim 5, wherein the amplifying circuit further comprises a fifth resistor, a second capacitor and a third capacitor, the third capacitor being connected in parallel with the fourth resistor, the second capacitor having one end connected between the bias voltage circuit and the second input of the amplifying circuit and the other end grounded;
The first input end of the amplifying circuit is connected with the non-inverting input end of the operational amplifier through the fifth resistor; or the second input end of the amplifying circuit is connected with the non-inverting input end of the operational amplifier through the fifth resistor.
7. The infrared signal processing circuit as recited in any one of claims 1-6, wherein the second filter circuit comprises a fourth capacitor and a seventh resistor, wherein one end of the fourth capacitor is connected to the output terminal of the amplifying circuit, the other end of the fourth capacitor is connected to the signal output terminal, and one end of the seventh resistor is connected between the fourth capacitor and the signal output terminal, and the other end of the seventh resistor is grounded.
8. The infrared signal processing circuit as recited in claim 1, further comprising an eighth resistor connected between the output of the amplifying circuit and the second filtering circuit.
9. An infrared signal receiving system, comprising: an infrared receiving device, a controller and an infrared signal processing circuit according to any one of claims 1 to 8, wherein the infrared receiving device is connected with the controller through the infrared signal processing circuit.
10. The touch screen is characterized by comprising an infrared transmitting device, a display screen and the infrared signal receiving system according to claim 9, wherein the infrared transmitting device transmits an infrared signal to the infrared signal receiving device, the infrared transmitting device is connected with the controller, and the controller is connected with the display screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322336367.8U CN220819212U (en) | 2023-08-29 | 2023-08-29 | Infrared signal processing circuit, infrared signal receiving system and touch screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322336367.8U CN220819212U (en) | 2023-08-29 | 2023-08-29 | Infrared signal processing circuit, infrared signal receiving system and touch screen |
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| Publication Number | Publication Date |
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| CN220819212U true CN220819212U (en) | 2024-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202322336367.8U Active CN220819212U (en) | 2023-08-29 | 2023-08-29 | Infrared signal processing circuit, infrared signal receiving system and touch screen |
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| CN (1) | CN220819212U (en) |
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- 2023-08-29 CN CN202322336367.8U patent/CN220819212U/en active Active
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