CN215264777U - Infrared touch signal processing circuit of touch display screen and touch display device - Google Patents
Infrared touch signal processing circuit of touch display screen and touch display device Download PDFInfo
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- CN215264777U CN215264777U CN202120157861.6U CN202120157861U CN215264777U CN 215264777 U CN215264777 U CN 215264777U CN 202120157861 U CN202120157861 U CN 202120157861U CN 215264777 U CN215264777 U CN 215264777U
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Abstract
The utility model provides a touch display screen's infrared touch signal processing circuit and touch display device. The infrared touch signal processing circuit of the touch display screen comprises: the device comprises an infrared touch signal detection module, a vibration detection device for detecting the vibration of a display screen, a processing chip and a display module; an infrared touch signal output end of the infrared touch signal detection module is connected with an infrared touch signal input end of the processing chip; the vibration electric signal output end of the vibration detection device is connected with the voltage input end of the processing chip; the display signal output end of the processing chip is connected with the display signal input end of the display module; when the voltage of the vibration electric signal output by the vibration electric signal output end of the vibration detection device is larger than or equal to the preset voltage threshold value, the processing chip does not send the touch signal to the display module. The utility model discloses can avoid because of the problem that leads to operation picture display error in the touch screen operation process because of the display screen vibration.
Description
Technical Field
The utility model relates to a touch display screen's infrared touch signal processing technology field, concretely relates to touch display screen's infrared touch signal processing circuit and touch display device.
Background
The infrared touch screen comprises a display screen, an infrared transmitting and receiving sensing element and a processing chip, wherein the infrared transmitting and receiving sensing element and the processing chip are arranged on the display screen, an infrared detection network is formed on the surface of the display screen, when any position on the screen is touched, the receiving sensing element generates a corresponding infrared touch signal according to the detected touch position, and then the processing chip receives and responds to the infrared touch signal sent by the sensing element. In the using process, when the infrared touch screen shakes due to large touch force or other reasons, the detection result of the receiving sensing element is easily seriously deviated, so that the processing chip receives a seriously deviated infrared touch signal, and the display screen correspondingly displays an error operation picture, thereby bringing inconvenience to the touch operation of a user.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome shortcoming and not enough among the prior art, provide a touch display screen's infrared touch signal processing circuit and touch display device, it can avoid because of the problem that leads to the operation picture to show the mistake because of the display screen vibration among the touch screen operation process.
An embodiment of the utility model provides a touch display screen's infrared touch signal processing circuit, include:
the infrared touch signal detection module comprises an infrared touch signal output end and is used for generating and sending an infrared touch signal;
the vibration detection device comprises a vibration electric signal output end; the vibration detection device is used for detecting the vibration state of the display screen;
the processing chip comprises an infrared touch signal input end, a vibration electric signal input end and a display signal output end; the infrared touch signal output end of the infrared touch signal detection module is connected with the infrared touch signal input end of the processing chip; the vibration electric signal output end of the vibration detection device is connected with the voltage input end of the processing chip;
the display module comprises a display signal input end; the display signal output end of the processing chip is connected with the display signal input end of the display module; when the processing chip receives an infrared touch signal sent by the infrared touch signal detection module and a vibration electric signal sent by the vibration detection device, if the voltage corresponding to the vibration electric signal transmitted by the vibration detection device is smaller than a preset voltage threshold value, the processing chip sends a touch signal to the display module; and if the voltage corresponding to the vibration electric signal transmitted by the vibration detection device is greater than or equal to a preset voltage threshold, the processing chip does not send a touch signal to the display module.
Compared with the prior art, the utility model discloses a touch display screen's infrared touch signal processing circuit passes through the voltage embodiment of vibration detection device output is rocked the range, works as when the voltage of the vibration signal of vibration detection device's vibration signal of telecommunication output is more than or equal to when predetermineeing the voltage threshold value, display module's via show signal input part and receive the touch invalid signal that the processing chip sent avoids producing the sensing error.
Furthermore, the vibration detection device also comprises a voltage comparison signal output end, and the processing chip also comprises a voltage comparison signal input end; the voltage comparison signal output end of the vibration detection device is connected with the voltage comparison signal input end of the processing chip;
when the processing chip receives the voltage comparison signal sent by the vibration detection device through the voltage comparison signal input end and the voltage comparison signal output end, the vibration electric signal input end of the processing chip receives the voltage output by the vibration electric signal output end. The voltage accurately received by the vibration electric signal input end of the processing chip can be controlled.
Further, the voltage output end of the processing chip comprises an SCL pin, an SDA pin, an SEL pin and a CS pin; the voltage input end of the processing chip comprises an MCU _ SCL pin, an MCU _ SDA pin, an MCU _ I2C _ ADD pin and an MCU _ CS pin; the SCL pin is connected with the MCU _ SCL pin, the SDA pin is connected with the MCU _ SDA pin, the SEL pin is connected with the MCU _ I2C _ ADD pin, and the CS pin is connected with the MCU _ CS pin.
Furthermore, the voltage comparison signal output end of the vibration detection device at least comprises an INT output pin, the voltage comparison signal input end of the processing chip at least comprises an INT input pin, and the INT input pin is connected with the INT output pin.
Further, the processing chip comprises a voltage comparison circuit, a reference voltage output module and a control module; the reverse phase input end of the voltage comparison circuit is connected with the output end of the reference voltage output module, and the non-reverse phase input end of the voltage comparison circuit is connected with the vibration electric signal output end of the vibration detection device; the control module comprises a first input end, a second input end and the display signal output end; the first input end of the control module is connected with the output end of the voltage comparison circuit, the second input end of the control module is connected with the infrared touch signal output end of the infrared touch signal detection module, and the display signal output end of the control module is connected with the display signal input end of the display module. And comparing the voltage output by the vibration electrical signal output end of the vibration detection device with the voltage output by the reference voltage output module by using a voltage comparison circuit, and judging whether the voltage output by the vibration electrical signal output end of the vibration detection device exceeds a preset voltage value or not.
Further, the voltage comparison circuit includes: the circuit comprises a first resistor, a second resistor, a voltage comparator, a third resistor and a working power supply module; the output end of the reference voltage output module is connected with the inverting input end of the voltage comparator through the first resistor; the vibration electric signal output end of the vibration detection device is connected with the non-inverting input end of the voltage comparator through the second resistor; the output end of the voltage comparator is connected with the output end of the working power supply module through the third resistor, and the output end of the voltage comparator is connected with the first input end of the control module; and the power end of the voltage comparator is connected with the output end of the working power supply module, and the grounding end of the voltage comparator is grounded. And the function of the voltage comparison circuit is ensured to be successfully realized.
Furthermore, the voltage comparison circuit further comprises a power supply filter circuit, the working power supply filter circuit comprises at least one capacitor, and the output end of the working power supply module is grounded through the capacitor. And the power supply module is used for filtering interference contained in the power supply output by the working power supply module.
Further, the operating power supply module includes: the MOS transistor comprises an MOS transistor, a fourth resistor, a fifth resistor, a sixth resistor and a triode; the vibration detection device comprises a power switch signal output end;
the source electrode of the MOS tube is connected with a power supply; the drain electrode of the MOS tube is connected with the power supply end of the voltage comparator, and the drain electrode of the MOS tube is connected with the output end of the voltage comparator through the third resistor; the grid electrode of the MOS tube is connected with the collector electrode of the triode through the fourth resistor, the base electrode of the triode is connected with the power switch signal output end of the vibration detection device through the fifth resistor, and the emitting electrode of the triode is grounded; one end of the sixth resistor is connected with the source electrode of the MOS tube, and the other end of the sixth resistor is connected with the grid electrode of the MOS tube. The power supply is ensured to be provided when the voltage of the vibration electric signal output end of the vibration detection device needs to be acquired.
Further, the display module is an LED display module, and the infrared touch signal detection module is arranged on the outer surface of the LED display module. The touch operation on the display screen can be successfully detected by the infrared touch signal detection module.
An embodiment of the utility model also provides a touch display device, include: the device comprises a machine body, a display screen, an infrared touch signal detection module, a vibration detection device for detecting the vibration of the display screen, a processing chip and a display module;
the display screen is detachably arranged on the machine body; the infrared touch signal detection module is arranged on the outer surface of the machine body and is positioned at the edge of the display screen; the vibration detection device is fixed on the machine body; the processing chip and the display module are arranged in the machine body;
the infrared touch signal detection module comprises an infrared touch signal output end;
the vibration detection device comprises a vibration electric signal output end;
the processing chip comprises an infrared touch signal input end, a vibration electric signal input end and a display signal output end; the infrared touch signal output end of the infrared touch signal detection module is connected with the infrared touch signal input end of the processing chip; the vibration electric signal output end of the vibration detection device is connected with the voltage input end of the processing chip;
the display module comprises a display signal input end and a display signal output end; the display signal output end of the processing chip is connected with the display signal input end of the display module; the display screen is connected with the display signal output end of the display module;
when the voltage of the vibration electric signal output by the vibration electric signal output end of the vibration detection device is larger than or equal to a preset voltage threshold value, the display module receives the touch invalid signal sent by the processing chip through the display signal input end and the display signal input end.
Compared with the prior art, the utility model discloses a touch display device can pass through the voltage embodiment of vibration detection device output is rocked the range, works as when the voltage of the vibration signal of telecommunication of vibration detection device's vibration signal of telecommunication output is more than or equal to when predetermineeing the voltage threshold value, display module's via show signal input part and receive the touch invalid signal that processing chip sent avoids producing the sensing error.
In order to make the present invention more clearly understood, the following description will be made in conjunction with the accompanying drawings.
Drawings
Fig. 1 is a module connection diagram of an infrared touch signal processing circuit of a touch display screen according to an embodiment of the present invention.
Fig. 2 is a module connection diagram of a processing chip of an infrared touch signal processing circuit of a touch display screen according to an embodiment of the present invention.
Fig. 3 is a circuit diagram of a voltage comparison circuit of an infrared touch signal processing circuit of a touch display screen according to an embodiment of the present invention.
Fig. 4 is a circuit diagram of an operating power supply module of an infrared touch signal processing circuit of a touch display screen according to an embodiment of the present invention.
Fig. 5 is a structural diagram of a touch display device according to an embodiment of the present invention.
1. An infrared touch signal detection module; 3. a vibration detection device; 5. processing the chip; 51. a voltage comparison circuit; 513. a voltage comparator; 515. a working power supply module; 53. a reference voltage output module; 55. a control module; 7. a display module; 8. a body; 9. a display screen.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Please refer to fig. 1, which is a module connection diagram of an infrared touch signal processing circuit of a touch display screen according to an embodiment of the present invention, including: the device comprises an infrared touch signal detection module 1, a vibration detection device 3 for detecting the vibration of a display screen, a processing chip 5 and a display module 7; the infrared touch signal detection module 1 includes an infrared touch signal output terminal. The infrared touch signal detection unit comprises an infrared light-emitting diode for emitting an infrared light signal, an infrared photosensitive diode for receiving the infrared light signal and a signal processing circuit; the infrared light emitting diode emits an infrared light signal, the infrared light signal is a fine infrared light beam, and the infrared light beams are staggered on the outer surface of the display screen to form an infrared light network; when the infrared optical network is touched, the infrared photosensitive diode generates an infrared touch signal, and the infrared touch signal is filtered, amplified and the like by the signal processing circuit and then is sent to the processing chip 5. The vibration detection device 3 comprises a vibration electric signal output end. The vibration detection device 3 may be a vibration sensor or a processing chip, the vibration electrical signal is a voltage signal, when the display screen vibrates, the vibration detection device 3 converts a parameter of the vibration into the vibration electrical signal, taking a piezoelectric vibration sensor as an example, the piezoelectric vibration sensor includes a piezoelectric crystal, a mass block, a base and an accelerometer, the piezoelectric crystal is compressed between the mass block and the base, when the accelerometer senses the vibration, the mass block applies a vibration force to the piezoelectric crystal, a corresponding electric potential is generated in the piezoelectric crystal, and the electric potential is output from a vibration electrical signal output end of the vibration sensor in the form of a voltage signal; the specific type thereof is not limited. The processing chip 5 comprises an infrared touch signal input end, a vibration electric signal input end and a display signal output end; the infrared touch signal output end of the infrared touch signal detection module 1 is connected with the infrared touch signal input end of the processing chip 5; and the vibration electric signal output end of the vibration detection device 3 is connected with the voltage input end of the processing chip 5. The processing chip 5 may be an MCU (micro control unit), and the specific model thereof is not limited.
The display module 7 comprises a display signal input end; the display signal output end of the processing chip 5 is connected with the display signal input end of the display module 7; when the voltage of the vibration electric signal output by the vibration electric signal output end of the vibration detection device 3 is greater than or equal to the preset voltage threshold value, the display module 7 receives the touch invalid signal sent by the processing chip 5 through the display signal input end and the display signal input end. The vibration detection device may be disposed at four edge positions of the display screen, in this embodiment, generally, the processing chip 5 sends a continuous display signal to the display module 7, and the display module 7 receives the display signal and displays, for example, the movement of a cursor, the display of strokes, and the like. The infrared touch signal detection module 1 detects a touch behavior and sends an infrared touch signal, and the vibration detection device 3 detects the vibration amplitude of the display screen and sends a vibration electric signal corresponding to the vibration amplitude; the processing chip 5 receives the infrared touch signal and the vibration electric signal, compares the voltage of the vibration electric signal with the preset voltage threshold, determines that the corresponding infrared touch signal is an invalid signal when the vibration electric signal is greater than or equal to the preset voltage threshold, and the processing chip 5 does not send a touch signal to the display module 7 and keeps sending continuous display signals to the display module 7; when the vibration electric signal is smaller than the preset voltage threshold, it is determined that the corresponding infrared touch signal is an effective signal, the processing chip 5 sends a touch effective signal to the display module 7, and sends a continuous display signal after responding to the infrared touch signal to the display module 7.
Compared with the prior art, the utility model discloses a touch display screen's infrared touch signal processing circuit passes through the range of rocking that the voltage of vibration detection device 3 output corresponds the display screen works as when the voltage of the vibration signal of vibration signal output of vibration detection device 3 output is more than or equal to predetermines the voltage threshold value, display module 7 via show signal input part and receive the touch invalid signal that processing chip 5 sent to avoid when the display screen vibration is great, because of the sensing error that actual touch position and anticipated touch position produced the deviation and lead to.
In a possible embodiment, the vibration detection device 3 further comprises a voltage comparison signal output terminal, and the processing chip 5 further comprises a voltage comparison signal input terminal; the voltage comparison signal output end of the vibration detection device 3 is connected with the voltage comparison signal input end of the processing chip 5;
when the processing chip 5 receives the voltage comparison signal sent by the vibration detection device 3 through the voltage comparison signal input end and the voltage comparison signal output end, the vibration electric signal input end of the processing chip 5 receives the voltage output by the vibration electric signal output end.
Preferably, the vibration electrical signal output end of the vibration detection device 3 is connected with the vibration electrical signal input end of the processing chip 5 through an I2C communication protocol connection mode.
Specifically, the vibration electric signal output end of the vibration detection device 3 comprises an SCL pin, an SDA pin, an SEL pin and a CS pin; the vibration electric signal input end of the processing chip 5 comprises an MCU _ SCL pin, an MCU _ SDA pin, an MCU _ I2C _ ADD pin and an MCU _ CS pin; the SCL pin is connected with the MCU _ SCL pin, the SDA pin is connected with the MCU _ SDA pin, the SEL pin is connected with the MCU _ I2C _ ADD pin, and the CS pin is connected with the MCU _ CS pin.
Preferably, the voltage comparison signal output terminal of the vibration detection device 3 at least comprises an INT output pin, and the voltage comparison signal input terminal of the processing chip 5 at least comprises an INT input pin, and the INT input pin is connected with the INT output pin.
In this embodiment, when the processing chip 5 receives the voltage comparison signal sent by the vibration detection device 3 through the INT input pin and the INT output pin, the processing chip 5 obtains a vibration electrical signal sent by the vibration detection device 3 through an I2C communication protocol, compares the vibration electrical signal with the preset voltage threshold, and when the comparison result is that the vibration electrical signal is greater than or equal to the preset voltage threshold, the processing chip 5 does not send a touch signal to the display module 7 and keeps sending a continuous display signal to the display module 7; when the comparison result shows that the vibration electric signal is smaller than the preset voltage threshold, determining that the corresponding infrared touch signal is an effective signal, sending a touch effective signal to the display module 7 by the processing chip 5, and sending a continuous display signal after responding to the infrared touch signal to the display module 7; when the processing chip 5 does not receive the voltage comparison signal, the processing chip 5 sends a touch valid signal to the display module 7, and sends a continuous display signal after responding to the infrared touch signal to the display module 7.
Referring to fig. 2, in one possible embodiment, the processing chip 5 includes a voltage comparison circuit 51, a reference voltage output module 53 and a control module 55; the inverting input end of the voltage comparison circuit 51 is connected with the output end of the reference voltage output module 53, and the non-inverting input end of the voltage comparison circuit is connected with the vibration electric signal output end of the vibration detection device 3; the control module 55 comprises a first input terminal, a second input terminal and the display signal output terminal; the first input end of the control module 55 is connected with the output end of the voltage comparison circuit 51, the second input end of the control module 55 is connected with the infrared touch signal output end of the infrared touch signal detection module 1, and the display signal output end of the control module 55 is connected with the display signal input end of the display module 7.
In this embodiment, the output of the control module 55 sends a continuous display signal to the display module 7. The working process is as follows: the voltage comparison circuit 51 receives the vibration electrical signal sent by the vibration detection device 3 via the non-inverting input terminal and the vibration electrical signal output terminal, and the voltage comparison circuit 51 receives the reference voltage sent by the reference voltage output module 53 via the inverting input terminal and the output terminal of the reference voltage output module 53, wherein the voltage value of the reference voltage is equal to the preset voltage threshold. The voltage comparison circuit 51 compares the vibration electrical signal with a reference voltage, when the vibration electrical signal is greater than the reference voltage, the output end of the voltage comparison circuit 51 outputs a high level, the control module 55 receives the high level through the first input end, and determines that the infrared touch signal sent by the infrared touch signal detection module 1 and received by the control module 55 through the second input end is an invalid signal, the processing chip 5 does not send a touch signal to the display module 7, and keeps sending a continuous display signal to the display module 7; when the vibration electric signal is smaller than the reference voltage, the output end of the voltage comparison circuit 51 outputs a low level, the control module 55 receives the low level through the first input end, and determines that the infrared touch signal sent by the infrared touch signal detection module 1 and received by the control module 55 through the second input end is an effective signal, and the output end of the control module 55 sends a touch effective signal to the display module 7 and sends a continuous display signal after responding to the infrared touch signal to the display module 7.
Referring to fig. 3, in one possible embodiment, the voltage comparison circuit 51 includes: a first resistor R1, a second resistor R2, a voltage comparator 513, a third resistor R3 and a working power supply module 515; the output end of the reference voltage output module 53 is connected to the inverting input end of the voltage comparator 513 via the first resistor R1; the vibration electrical signal output end of the vibration detection device 3 is connected with the non-inverting input end of the voltage comparator 513 through the second resistor R2; the output of the voltage comparator 513 is connected to the output of the operating power supply module 515 via the third resistor R3, and the output of the voltage comparator 513 is connected to the first input of the control module 55; a power end of the voltage comparator 513 is connected to an output end of the working power supply module 515, and a ground end of the voltage comparator 513 is grounded. The voltage comparison circuit 51 can accurately compare the vibration electric signal output by the vibration detection device 3 with the reference voltage output by the reference voltage output module 53.
In one possible embodiment, the voltage comparison circuit 51 further comprises a power filter circuit, and the operating power filter circuit comprises at least one capacitor, and the output terminal of the operating power module 515 is grounded via the capacitor. Preferably, the operating power filter circuit includes a first capacitor C1 and a second capacitor C2 having different capacitances. The filter circuit is used for filtering the interference of the working power supply filter circuit and improving the working stability of the voltage comparison circuit 51.
Referring to fig. 4, in one possible embodiment, the operating power module 515 includes: the MOS transistor, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6 and the triode Q1; the vibration detection device 3 comprises a power switch signal output end;
the source electrode of the MOS tube is connected with a power supply Vcc; the drain of the MOS transistor is connected to the power supply terminal of the voltage comparator 513, and the drain of the MOS transistor is connected to the output terminal of the voltage comparator 513 via the third resistor R3; the gate of the MOS transistor is connected to the collector of the transistor Q1 via the fourth resistor R4, the base of the transistor Q1 is connected to the power switch signal output terminal of the vibration detection apparatus 3 via the fifth resistor R5, and the emitter of the transistor Q1 is grounded; one end of the sixth resistor R6 is connected with the source electrode of the MOS tube, and the other end of the sixth resistor R6 is connected with the gate electrode of the MOS tube.
In this embodiment, when the vibration detection apparatus 3 senses vibration, the power switch signal output terminal outputs a power switch signal to turn on the transistor Q1, so that the power supply Vcc is grounded via the sixth resistor R6 and the fourth resistor R4 to form a bias circuit and provide a voltage to the gate of the MOS transistor, so that the MOS transistor is turned on, and the power supply Vcc supplies power to the power terminal of the voltage comparator 513.
In one embodiment, the display module 7 is an LED display module, and the infrared touch signal detection module 1 is disposed on an outer surface of the LED display module. The LED display module is used for displaying pictures, so that the display definition is improved.
Referring to fig. 5, an embodiment of the present invention further provides a touch display device, including: the device comprises a body 8, a display screen 9, an infrared touch signal detection module 1, a vibration detection device for detecting the vibration of the display screen 9, a processing chip and a display module;
the display screen 9 is detachably arranged on the machine body 8; the infrared touch signal detection module 1 is arranged on the outer surface of the body 8 and is positioned at the edge of the display screen 9; the vibration detection device is fixed on the machine body 8; the processing chip and the display module are arranged inside the machine body 8;
the infrared touch signal detection module 1 comprises an infrared touch signal output end;
the vibration detection device comprises a vibration electric signal output end;
the processing chip comprises an infrared touch signal input end, a vibration electric signal input end and a display signal output end; the infrared touch signal output end of the infrared touch signal detection module 1 is connected with the infrared touch signal input end of the processing chip; the vibration electric signal output end of the vibration detection device is connected with the voltage input end of the processing chip;
the display module comprises a display signal input end and a display signal output end; the display signal output end of the processing chip is connected with the display signal input end of the display module; the display screen 9 is connected with a display signal output end of the display module;
when the processing chip receives the infrared touch signal sent by the infrared touch signal detection module 1 and the vibration electric signal sent by the vibration detection device, if the voltage corresponding to the vibration electric signal transmitted by the vibration detection device is smaller than a preset voltage threshold, the processing chip sends a touch signal to the display module 9; if the voltage corresponding to the vibration electric signal transmitted by the vibration detection device is greater than or equal to the preset voltage threshold, the processing chip does not send the touch signal to the display module 9.
In this embodiment, the processing chip sends a continuous display signal to the display module, the display module receives and displays the display signal, and the display portion protects the display module. The infrared touch signal detection module 1 detects a touch behavior and sends an infrared touch signal, and the vibration detection device detects the vibration amplitude of the display screen 9 and sends a vibration electric signal corresponding to the vibration amplitude; the processing chip receives the infrared touch signal and the vibration electric signal, compares the voltage of the vibration electric signal with the preset voltage threshold, determines that the corresponding infrared touch signal is an invalid signal when the vibration electric signal is greater than or equal to the preset voltage threshold, does not send the touch signal to the display module, and keeps sending continuous display signals to the display module; when the vibration electric signal is smaller than the preset voltage threshold, the corresponding infrared touch signal is determined to be an effective signal, the processing chip sends a touch effective signal to the display module, and sends a continuous display signal responding to the infrared touch signal to the display module.
Compared with the prior art, the touch display device of the utility model reflects the shaking amplitude through the voltage output by the vibration detection device, when the voltage of the vibration electric signal output by the vibration electric signal output end of the vibration detection device is greater than or equal to the preset voltage threshold value, the processing chip does not send the touch signal to the display module, and the sensing error is avoided; and also protects the display module with the display screen 9 from damage during touching.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. An infrared touch signal processing circuit of a touch display screen, comprising:
the infrared touch signal detection module comprises an infrared touch signal output end and is used for generating and sending an infrared touch signal;
the vibration detection device comprises a vibration electric signal output end; the vibration detection device is used for detecting the vibration state of the display screen;
the processing chip comprises an infrared touch signal input end, a vibration electric signal input end and a display signal output end; the infrared touch signal output end of the infrared touch signal detection module is connected with the infrared touch signal input end of the processing chip; the vibration electric signal output end of the vibration detection device is connected with the voltage input end of the processing chip;
the display module comprises a display signal input end; the display signal output end of the processing chip is connected with the display signal input end of the display module; when the processing chip receives an infrared touch signal sent by the infrared touch signal detection module and a vibration electric signal sent by the vibration detection device, if the voltage corresponding to the vibration electric signal transmitted by the vibration detection device is smaller than a preset voltage threshold value, the processing chip sends a touch signal to the display module; and if the voltage corresponding to the vibration electric signal transmitted by the vibration detection device is greater than or equal to a preset voltage threshold, the processing chip does not send a touch signal to the display module.
2. The infrared touch signal processing circuit of the touch display screen of claim 1, wherein: the vibration detection device also comprises a voltage comparison signal output end, and the processing chip also comprises a voltage comparison signal input end; the voltage comparison signal output end of the vibration detection device is connected with the voltage comparison signal input end of the processing chip; when the processing chip receives the voltage comparison signal sent by the vibration detection device, the processing chip receives the vibration electric signal transmitted by the vibration electric signal output end.
3. The infrared touch signal processing circuit of the touch display screen of claim 2, wherein: the voltage output end of the processing chip comprises an SCL pin, an SDA pin, an SEL pin and a CS pin; the voltage input end of the processing chip comprises an MCU _ SCL pin, an MCU _ SDA pin, an MCU _ I2C _ ADD pin and an MCU _ CS pin; the SCL pin is connected with the MCU _ SCL pin, the SDA pin is connected with the MCU _ SDA pin, the SEL pin is connected with the MCU _ I2C _ ADD pin, and the CS pin is connected with the MCU _ CS pin.
4. The infrared touch signal processing circuit of the touch display screen of claim 3, wherein: the voltage comparison signal output end of the vibration detection device at least comprises one INT output pin, the voltage comparison signal input end of the processing chip at least comprises one INT input pin, and the INT input pin is connected with the INT output pin.
5. The infrared touch signal processing circuit of the touch display screen of claim 1, wherein: the processing chip comprises a voltage comparison circuit, a reference voltage output module and a control module; the reverse phase input end of the voltage comparison circuit is connected with the output end of the reference voltage output module, and the non-reverse phase input end of the voltage comparison circuit is connected with the vibration electric signal output end of the vibration detection device; the control module comprises a first input end, a second input end and the display signal output end; the first input end of the control module is connected with the output end of the voltage comparison circuit, the second input end of the control module is connected with the infrared touch signal output end of the infrared touch signal detection module, and the display signal output end of the control module is connected with the display signal input end of the display module.
6. The infrared touch signal processing circuit of the touch display screen of claim 5, wherein the voltage comparison circuit comprises: the circuit comprises a first resistor, a second resistor, a voltage comparator, a third resistor and a working power supply module; the output end of the reference voltage output module is connected with the inverting input end of the voltage comparator through the first resistor; the vibration electric signal output end of the vibration detection device is connected with the non-inverting input end of the voltage comparator through the second resistor; the output end of the voltage comparator is connected with the output end of the working power supply module through the third resistor, and the output end of the voltage comparator is connected with the first input end of the control module; and the power end of the voltage comparator is connected with the output end of the working power supply module, and the grounding end of the voltage comparator is grounded.
7. The infrared touch signal processing circuit of the touch display screen of claim 6, wherein: the voltage comparison circuit further comprises a power supply filter circuit, the working power supply filter circuit comprises at least one capacitor, and the output end of the working power supply module is grounded through the capacitor.
8. The infrared touch signal processing circuit of the touch display screen of claim 6, wherein the operating power supply module comprises: the MOS transistor comprises an MOS transistor, a fourth resistor, a fifth resistor, a sixth resistor and a triode; the vibration detection device comprises a power switch signal output end;
the source electrode of the MOS tube is connected with a power supply; the drain electrode of the MOS tube is connected with the power supply end of the voltage comparator, and the drain electrode of the MOS tube is connected with the output end of the voltage comparator through the third resistor; the grid electrode of the MOS tube is connected with the collector electrode of the triode through the fourth resistor, the base electrode of the triode is connected with the power switch signal output end of the vibration detection device through the fifth resistor, and the emitting electrode of the triode is grounded; one end of the sixth resistor is connected with the source electrode of the MOS tube, and the other end of the sixth resistor is connected with the grid electrode of the MOS tube.
9. The infrared touch signal processing circuit of the touch display screen of claim 1, wherein: the display module is an LED display module, and the infrared touch signal detection module is arranged on the outer surface of the LED display module.
10. A touch display device, comprising: the device comprises a machine body, a display screen, an infrared touch signal detection module, a vibration detection device for detecting the vibration of the display screen, a processing chip and a display module;
the display screen is detachably arranged on the machine body; the infrared touch signal detection module is arranged on the outer surface of the machine body and is positioned at the edge of the display screen; the vibration detection device is fixed on the machine body; the processing chip and the display module are arranged in the machine body;
the infrared touch signal detection module comprises an infrared touch signal output end;
the vibration detection device comprises a vibration electric signal output end;
the processing chip comprises an infrared touch signal input end, a vibration electric signal input end and a display signal output end; the infrared touch signal output end of the infrared touch signal detection module is connected with the infrared touch signal input end of the processing chip; the vibration electric signal output end of the vibration detection device is connected with the voltage input end of the processing chip;
the display module comprises a display signal input end and a display signal output end; the display signal output end of the processing chip is connected with the display signal input end of the display module; the display screen is connected with the display signal output end of the display module;
when the processing chip receives an infrared touch signal sent by the infrared touch signal detection module and a vibration electric signal sent by the vibration detection device, if the voltage corresponding to the vibration electric signal transmitted by the vibration detection device is smaller than a preset voltage threshold value, the processing chip sends a touch signal to the display module; and if the voltage corresponding to the vibration electric signal transmitted by the vibration detection device is greater than or equal to a preset voltage threshold, the processing chip does not send a touch signal to the display module.
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| CN202120157861.6U CN215264777U (en) | 2021-01-20 | 2021-01-20 | Infrared touch signal processing circuit of touch display screen and touch display device |
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