CN211698917U - Drive circuit of touch screen - Google Patents
Drive circuit of touch screen Download PDFInfo
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- CN211698917U CN211698917U CN202020739697.5U CN202020739697U CN211698917U CN 211698917 U CN211698917 U CN 211698917U CN 202020739697 U CN202020739697 U CN 202020739697U CN 211698917 U CN211698917 U CN 211698917U
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Abstract
The utility model relates to an industrial control or intelligent household electrical appliances technical field disclose a drive circuit of stable touch-sensitive screen of data transmission, possess: the touch sensor (101) is arranged on the front end face of the liquid crystal screen, and the touch sensor (101) is used for detecting a touch signal of a user; the input end of the touch screen controller (102) is coupled to the output end of the touch sensor (101), and the touch screen controller (102) is used for receiving a touch signal and converting the touch signal into a contact point coordinate signal; the input end of the microprocessor (103) is connected with the output end of the touch screen controller (102); and the microprocessor (103) processes the input touch point coordinate signal to control the liquid crystal screen to realize user data interaction.
Description
Technical Field
The utility model relates to an industrial control or intelligent household electrical appliances technical field, more specifically say, relate to a drive circuit of touch-sensitive screen.
Background
The touch screen is used as an important means of man-machine interaction, and the interface technology of the microcontroller and the touch screen is widely applied to the fields of industrial control, intelligent household appliances and the like. At present, when a microcontroller and a touch screen carry out data interaction test, the touch response sensitivity of the touch screen is poor due to unstable data transmission.
Therefore, how to improve the stability of data transmission becomes a technical problem that needs to be solved urgently by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, because data transmission is unstable to the above-mentioned of prior art, lead to the relatively poor defect of touch response sensitivity of touch-sensitive screen, provide a drive circuit of stable touch-sensitive screen of data transmission.
The utility model provides a technical scheme that its technical problem adopted is: a drive circuit for a touch panel is configured, and the drive circuit is provided with:
the touch sensor is arranged on the front end face of the liquid crystal screen and used for detecting a touch signal of a user;
the input end of the touch screen controller is coupled with the output end of the touch sensor, and the touch screen controller is used for receiving the touch signal and converting the touch signal into a contact point coordinate signal;
the input end of the microprocessor is connected with the output end of the touch screen controller;
and the microprocessor processes the input contact coordinate signal to control the liquid crystal screen to realize user data interaction.
In some embodiments, the touch screen controller is provided with a 4-channel multiplexer, and the 4-channel multiplexer is provided with an X + end, a Y + end, an X-end and a Y-end;
and the touch signal is input into the touch screen controller through an X + end, a Y + end, an X-end and a Y-end of the 4-channel multiplexer.
In some embodiments, the device further comprises a first resistor, a second resistor and a first triode,
one end of the first resistor is connected with a pulse signal output end of the microprocessor, and the other end of the first resistor is respectively connected with one end of the second resistor and a base electrode of the first triode;
the other end of the second resistor is connected with a power supply end, and the collector of the first triode is connected with one end of the touch sensor.
In some embodiments, the first transistor is an NPN transistor.
In some embodiments, the circuit further comprises a sixth resistor, a seventh resistor and a second capacitor, the sixth resistor is connected in series with the second capacitor,
one end of the sixth resistor and one end of the seventh resistor are respectively connected with the reset end of the microprocessor, and the other end of the seventh resistor is connected with a power supply end.
In some embodiments, the apparatus further includes an eighth resistor and a second triode, one end of the eighth resistor is connected to the voice control end of the microprocessor, the other end of the eighth resistor is coupled to a base of the second triode, and a collector of the second triode is connected to a power supply end.
In some embodiments, a power supply circuit is also included, the power supply circuit being configured to provide +3.3V power.
The driving circuit of the touch screen of the present invention comprises a touch sensor, a touch screen controller and a microprocessor, wherein the touch sensor is used for detecting a touch signal of a user; the touch screen controller is used for receiving the touch signal and converting the touch signal into a contact point coordinate signal; and the microprocessor processes the input contact coordinate signal to control the liquid crystal screen to realize user data interaction. Compared with the prior art, the touch screen controller processes the touch point coordinate signals through the microprocessor according to the corresponding touch point coordinate signals on the touch screen to form images, characters and touch input control signals, so that the problem that the touch response sensitivity of the touch screen is poor due to unstable data transmission is solved.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic structural diagram of an embodiment of a driving circuit of a touch panel according to the present invention;
FIG. 2a is a partial touch circuit diagram of one embodiment of a driver circuit for a touch screen;
fig. 2b provides a circuit diagram of another embodiment of a driving circuit for a touch screen.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an embodiment of a driving circuit of a touch panel according to the present invention; FIG. 2a is a partial touch circuit diagram of one embodiment of a driver circuit for a touch screen; fig. 2b provides a circuit diagram of another embodiment of a driving circuit for a touch screen. As shown in fig. 1 to 2b, in the first embodiment of the driving circuit of the touch screen of the present invention, the driving circuit of the touch screen mainly includes a touch sensor 101, a touch screen controller 102 and a microprocessor 103.
The touch sensor 101 is a transparent glass plate with a touch-responsive surface, and the touch sensor 101 is mounted on the front surface of the liquid crystal panel such that the touch area of the panel covers the viewable area of the display screen, and upon touching, current is caused to flow through the panel, thereby producing a voltage or signal change that is sensed by the touch sensor 101 to determine the location of the user's touch (i.e., the touch signal) on the screen.
The touchscreen controller 102 is a four-wire resistive touchscreen conversion interface chip with a 12-bit sampling analog-to-digital converter for a synchronous serial interface.
Specifically, the touch screen controller 102 is provided with one 4-channel multiplexer, and the 4-channel multiplexers correspond to two X-axis multiplexers and two Y-axis multiplexers, respectively. When measuring the X-axis direction, applying a reference voltage Vref between an X + end and an X-end, disconnecting a Y-end, and taking the Y + end as the input of an A/D converter (namely an analog-to-digital converter) to obtain the voltage of the X-axis direction; when the Y-axis direction is measured, a reference voltage Vref is applied between a Y + end and a Y-end, the X-end is disconnected, the X + end is used as the input of an A/D converter, after the voltage in the Y-axis direction is obtained through A/D conversion, the conversion of the voltage and coordinates is completed, different voltages are obtained through touch at different positions, and the touch signals are converted into contact point coordinate signals.
The microprocessor 103 can support 32-bit embedding of real-time simulation and embedded tracking, is internally provided with a wide-range serial communication interface, a 14-channel 10-bit ADC, a 1-channel 10-bit DAC, 45 high-speed GPIO lines and up to 9 external interrupt pins triggered by edges or levels, is integrated with an on-chip SRAM of 40kB and a 512kB embedded high-speed Flash memory, is applied to communication gateways, protocol converters, voice recognition, low-end imaging and the like, and is suitable for data processing and data interaction or storage.
Specifically, the touch sensor 101 (corresponding to U101) is configured to acquire a touch position (i.e., a touch signal) of the user on the screen and output the touch position (i.e., the touch signal) to the touch screen controller 102 (corresponding to U102).
The operating voltage of the touch screen controller 102 is +3.3V, and the analog input terminals (corresponding to the X + terminal, the Y + terminal, the X-terminal, and the Y-terminal, respectively) of the a/D converter are a 4-channel multiplexer.
The DCLK terminal (corresponding to pin 4) is an external clock input pin; the CS end (corresponding to the 3 rd pin) is a chip selection input end, and the low level is effective; the DIN terminal (corresponding to pin 2) is a serial input terminal through which control data is input; the OUT terminal (corresponding to the 16 th pin) is a serial data output terminal and is used for outputting the converted touch position data; the PENIRQ terminal (corresponding to pin 15) is a PEN interrupt that is used to trigger an interrupt upon touching the display screen.
The input end of the touch screen controller 102 is connected to the output end of the touch sensor U101, and the touch screen controller 102 is configured to receive a touch signal output by the touch sensor U101, convert the touch signal into a contact coordinate signal to obtain corresponding voltage data, and output the contact coordinate signal (i.e., the corresponding voltage data) to the microprocessor 201 (corresponding to U201).
An input of the microprocessor 201 is connected to an output of the touch screen controller 102. Specifically, a serial data input end (corresponding to 8 pins) of the microprocessor 201 is connected with a serial data output end (corresponding to 16 th pin) of the touch screen controller 102, receives a contact coordinate signal output by the touch screen controller 102 through the serial data input end, and processes the contact coordinate signal to control the liquid crystal display to realize user data interaction.
By using the technical scheme, the touch position of a user on the screen is processed through the touch screen controller U102, namely, a contact point coordinate signal is established, and then the contact point coordinate signal is processed through the microprocessor U201 to form an image, a character and a touch input control signal, so that the stability of data transmission is improved, and the problem of poor touch response sensitivity of the touch screen is solved.
In some embodiments, in order to improve the accuracy of the touch position, a 4-channel multiplexer (not shown in the figure) may be disposed in the touch screen controller 102, wherein the 4-channel multiplexer has an X + terminal, a Y + terminal, an X-terminal, and a Y-terminal, and the X + terminal, the Y + terminal, the X-terminal, and the Y-terminal of the 4-channel multiplexer are respectively connected to the X + terminal, the Y + terminal, the X-terminal, and the Y-terminal of the touch sensor U101, and the touch sensor U101 inputs the touch signal to the touch screen controller 102 through the X + terminal, the Y + terminal, the X-terminal, and the Y-terminal of the 4-channel multiplexer and establishes a touch coordinate signal for the touch signal, so as to improve the accuracy of the touch position.
In some embodiments, in order to improve the performance of the circuit, a first resistor R101, a second resistor R102, and a first transistor VT101 may be disposed in the circuit, wherein the first transistor VT101 is an NPN transistor having a switching function.
Specifically, one end of the first resistor R101 is connected to a pulse signal output end (corresponding to the 19 pins) of the microprocessor U201, and the other end of the first resistor R101 is connected to one end of the second resistor R102 and a base of the first transistor VT101, respectively, that is, the pulse signal (i.e., PWM signal) output by the microprocessor U201 is input to the first transistor VT101 through the first resistor R101.
The other end of the second resistor R102 is connected to a power supply terminal (corresponding to +3.3V), and the collector of the first transistor VT101 is connected to one end of the touch sensor 101 (corresponding to pins 18-21).
When the PWM signal output from the microprocessor U201 is at a high level, the +3.3V voltage applied to the collector of the first transistor VT101 turns on the first transistor VT101, and the +3.3V voltage is input to the touch sensor 101 through the third resistor R103 to the sixth resistor R106.
In some embodiments, the touch switch further includes a sixth resistor R201, a seventh resistor R202, a second capacitor C201, and a touch switch K1, and specifically, the sixth resistor R201 is connected in series with the second capacitor C201 and then connected in parallel with the touch switch K1.
One end of the sixth resistor R201 and one end of the seventh resistor R202 are respectively connected to the reset terminal (corresponding to pin 57) of the microprocessor U201, and the other end of the seventh resistor R202 is connected to the power supply terminal (corresponding to + 3.3V).
In some embodiments, the integrated circuit further comprises an eighth resistor R203 and a second transistor VT201, wherein the second transistor VT201 is a PNP transistor having a switching or signal amplifying function.
Specifically, one end of the eighth resistor R203 is connected to the voice control terminal (corresponding to pin 9) of the microprocessor U201, the other end of the eighth resistor R203 is coupled to the base of the second transistor VT201, and the collector of the second transistor VT201 is connected to the power supply terminal (corresponding to + 3.3V).
In some embodiments, in order to ensure the stability of the operation of the circuit, a power supply circuit may be provided in the circuit, and the power supply circuit includes a fourth capacitor C203, a power supply chip, a fifth capacitor C204, and a sixth capacitor C205, which have a filtering function.
Specifically, one end of the fourth capacitor C203 is connected to the power input end of the power chip, the other end of the fourth capacitor C203 is connected to the common end of the power chip, and the fifth capacitor C204 and the sixth capacitor C205 are connected in parallel between the output end and the common end of the power chip, so as to stabilize the input +5V power to +3.3V, and provide a +3.3V power for the circuit.
While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (7)
1. A drive circuit for a touch panel, comprising:
the touch sensor is arranged on the front end face of the liquid crystal screen and used for detecting a touch signal of a user;
the input end of the touch screen controller is coupled with the output end of the touch sensor, and the touch screen controller is used for receiving the touch signal and converting the touch signal into a contact point coordinate signal;
the input end of the microprocessor is connected with the output end of the touch screen controller;
and the microprocessor processes the input contact coordinate signal to control the liquid crystal screen to realize user data interaction.
2. The touch screen driving circuit according to claim 1,
the touch screen controller is provided with a 4-channel multiplexer, and the 4-channel multiplexer is provided with an X + end, a Y + end, an X-end and a Y-end;
and the touch signal is input into the touch screen controller through an X + end, a Y + end, an X-end and a Y-end of the 4-channel multiplexer.
3. The touch screen driving circuit according to claim 1,
also comprises a first resistor, a second resistor and a first triode,
one end of the first resistor is connected with a pulse signal output end of the microprocessor, and the other end of the first resistor is respectively connected with one end of the second resistor and a base electrode of the first triode;
the other end of the second resistor is connected with a power supply end, and the collector of the first triode is connected with one end of the touch sensor.
4. The touch screen driving circuit according to claim 3,
the first triode is an NPN type triode.
5. The touch screen driving circuit according to claim 1,
the circuit also comprises a sixth resistor, a seventh resistor and a second capacitor, wherein the sixth resistor is connected with the second capacitor in series,
one end of the sixth resistor and one end of the seventh resistor are respectively connected with the reset end of the microprocessor, and the other end of the seventh resistor is connected with a power supply end.
6. The touch screen driving circuit according to claim 5,
the voice control circuit further comprises an eighth resistor and a second triode, one end of the eighth resistor is connected with the voice control end of the microprocessor, the other end of the eighth resistor is coupled to the base electrode of the second triode, and the collector electrode of the second triode is connected with a power supply end.
7. The touch panel driving circuit according to any one of claims 1 to 6,
the power supply circuit is used for providing +3.3V power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020739697.5U CN211698917U (en) | 2020-05-08 | 2020-05-08 | Drive circuit of touch screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020739697.5U CN211698917U (en) | 2020-05-08 | 2020-05-08 | Drive circuit of touch screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211698917U true CN211698917U (en) | 2020-10-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020739697.5U Active CN211698917U (en) | 2020-05-08 | 2020-05-08 | Drive circuit of touch screen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211698917U (en) |
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2020
- 2020-05-08 CN CN202020739697.5U patent/CN211698917U/en active Active
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