CN217279981U - Drive circuit and electronic equipment of LED dot matrix screen - Google Patents
Drive circuit and electronic equipment of LED dot matrix screen Download PDFInfo
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- CN217279981U CN217279981U CN202123363519.0U CN202123363519U CN217279981U CN 217279981 U CN217279981 U CN 217279981U CN 202123363519 U CN202123363519 U CN 202123363519U CN 217279981 U CN217279981 U CN 217279981U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The utility model discloses a drive circuit and electronic equipment of LED dot matrix screen, drive circuit include control module, voltage conversion chip, switch tube and signal conversion chip: the signal input end of the signal conversion chip is electrically connected with the SPI signal output end of the control module, and the signal output end is connected with the SPI signal input end of the LED dot matrix screen; the grid electrode of the switching tube is connected with a first I/O pin of the control module, and the drain electrode of the switching tube is respectively connected with an LED signal pin of the LED dot matrix screen; and the voltage input end of the voltage conversion chip is electrically connected with a power supply, and the voltage output end of the voltage conversion chip is electrically connected with the reset pin of the control module and the reset pin of the LED dot matrix screen respectively. The utility model discloses to SPI signal service signal conversion chip, to reset signal service voltage conversion chip, to LED drive signal use switch tube, realize the drive to the LED dot matrix screen through the level conversion mode of difference to ensure communication quality, reduce the cost of circuit.
Description
Technical Field
The utility model relates to a drive circuit field, in particular to drive circuit and electronic equipment of LED (light emitting diode) dot matrix screen.
Background
The dot matrix display is a novel display mode integrating microelectronic technology, computer technology and information processing, and due to the high requirements of screen display and signal communication quality, the LED dot matrix screen is mainly driven by adopting a scheme of serial ports of SPI (serial peripheral interface) signal lines, so that the requirement on driving capability is higher, and the power consumption of a control end is higher. In order to satisfy the driving of the control end to the LED dot matrix screen, in the prior art, the low level signal of the control end is mainly converted into the available high level signal through a triode or a MOS (field effect transistor), however, the processing will affect the communication quality of the SPI signal line.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is that the communication quality for overcoming dot matrix screen among the prior art is poor, the big defect of required consumption provides a drive circuit and electronic equipment of LED dot matrix screen.
The utility model discloses an above-mentioned technical problem is solved through following technical scheme:
the utility model discloses the first aspect provides a drive circuit of LED dot matrix screen, drive circuit includes control module, voltage conversion chip, switch tube and signal conversion chip:
the voltage conversion chip is used for carrying out level conversion on input voltage, and the signal conversion chip is used for carrying out level conversion on input signals;
the signal input end of the signal conversion chip is electrically connected with the SPI signal output end of the control module, and the signal output end of the signal conversion chip is electrically connected with the SPI signal input end of the LED dot matrix screen;
the grid electrode of the switch tube is electrically connected with a first input/output (I/O) pin of the control module, the drain electrode of the switch tube is respectively electrically connected with three LED signal pins of the LED dot matrix screen, and the source electrode of the switch tube is grounded;
the voltage input end of the voltage conversion chip is electrically connected with a power supply, and the voltage output end of the voltage conversion chip is electrically connected with the reset pin of the control module and the reset pin of the LED dot matrix screen respectively.
Preferably, the driving circuit further comprises a triode,
and the emitting electrode of the triode is electrically connected with a reset pin of the control module, the base electrode of the triode is electrically connected with the voltage input end of the voltage conversion chip, and the collecting electrode of the triode is electrically connected with the reset pin of the LED dot matrix screen.
Preferably, a voltage input end of the signal conversion chip is electrically connected with a voltage output end of the control module;
and the voltage output end of the signal conversion chip is electrically connected with the voltage output end of the voltage conversion chip.
Preferably, the driving circuit further comprises a first capacitor, one end of the first capacitor is electrically connected with the voltage input end of the signal conversion chip, and the other end of the first capacitor is grounded; and/or the presence of a gas in the gas,
the driving circuit further comprises a second capacitor, one end of the second capacitor is electrically connected with the voltage output end of the signal conversion chip, and the other end of the second capacitor is grounded.
Preferably, the driving circuit further includes a third capacitor, one end of the third capacitor is electrically connected to the voltage input end of the LED dot matrix screen, and the other end of the third capacitor is grounded.
Preferably, the driving circuit further includes a first TVS (transient diode) transistor, a cathode of the first TVS transistor is electrically connected to the signal output terminal of the signal conversion chip, and an anode thereof is grounded; and/or the presence of a gas in the atmosphere,
the driving circuit further comprises a second TVS tube, wherein the cathode of the second TVS tube is electrically connected with the reset pin of the LED dot matrix screen, and the anode of the second TVS tube is grounded; and/or the presence of a gas in the atmosphere,
the drive circuit further comprises a third TVS tube, the negative electrode of the third TVS tube is electrically connected with the voltage input end of the LED dot matrix screen, and the positive electrode of the third TVS tube is grounded.
Preferably, the driving circuit further includes a first resistor connected in series between the voltage input terminal of the voltage converting chip and the base of the triode; and/or the presence of a gas in the atmosphere,
the driving circuit further comprises a second resistor which is connected in series between the voltage output end of the voltage conversion chip and the reset pin of the LED dot matrix screen.
Preferably, the driving circuit further includes a third resistor connected in series between the gate of the switching tube and the first I/O pin of the control module;
and/or the driving circuit further comprises a fourth capacitor, one end of the fourth capacitor is electrically connected with the grid electrode of the switching tube, and the other end of the fourth capacitor is grounded.
Preferably, the LED dot matrix screen is integrated with a driving chip with an SPI communication function.
The utility model discloses the second aspect provides an electronic equipment, electronic equipment includes the LED dot matrix screen and as above-mentioned drive circuit of LED dot matrix screen.
The utility model discloses an actively advance the effect and lie in:
realize the drive to different functions in the LED dot matrix screen through different level conversion modes, specifically, to the higher SPI signal of signal communication quality requirement use signal conversion chip to carry out level conversion, to reset signal use voltage conversion chip to carry out level conversion, and to the available switch tube of the lower LED drive signal of communication quality requirement carry out level conversion to the realization is to the drive of LED dot matrix screen, is guaranteeing simultaneously under the prerequisite of communication quality, has reduced the cost of whole circuit.
Drawings
Fig. 1 is a schematic diagram of a driving circuit of an LED dot matrix screen according to embodiment 1 of the present invention.
Fig. 2 is the circuit schematic diagram of SPI signal level transition and reset signal level transition in the drive circuit of LED dot matrix screen of embodiment 1 of the present invention.
Fig. 3 is a schematic circuit diagram of the level conversion of the LED driving signal in the driving circuit of the LED dot matrix screen according to embodiment 1 of the present invention.
Detailed Description
The present invention will be more clearly and completely described below with reference to the accompanying drawings.
Example 1
The embodiment provides a driving circuit of an LED dot matrix screen, which can be applied to drive electronic devices such as an LED dot matrix screen, as shown in fig. 1, the driving circuit includes a control module 1, a voltage conversion chip 2, a signal conversion chip 3, and an LED dot matrix screen 4.
In an implementation scheme, the voltage conversion chip 2 is configured to perform level conversion on a level of an input voltage signal, the signal conversion chip 3 is configured to perform level conversion on a level of an input SPI signal, and a signal level of a corresponding control signal line can satisfy a driving level through the level conversion.
The SPI signal output of the control module 1 is electrically connected to the signal input of the signal conversion chip 3. in an implementable scheme, the signal conversion chip 3 is an SGM4564 level conversion chip, and the SGM4564 chip is a 4-bit bidirectional voltage level converter with automatic direction sensing, and the level conversion can meet the rate requirement of SPI signal line communication. Referring to fig. 1, the LCD _ SPI _ CS pin, the LCE _ DCX pin, the LCD _ SPI _ TXD pin, and the LCD _ SPI _ CLK pin are respectively represented as SPI signal output terminals of the control module 1, the a1 pin, the a2 pin, the A3 pin, and the a4 pin are respectively represented as signal input terminals of the signal conversion chip 3, and the LCD _ SPI _ CS pin, the LCE _ DCX pin, the LCD _ SPI _ TXD pin, and the LCD _ SPI _ CLK pin of the control module 1 are electrically connected to the a1 pin, the a2 pin, the A3 pin, and the a4 pin of the signal conversion chip 3, respectively.
The signal output end of the signal conversion chip 3 is electrically connected with the SPI signal input end of the LED dot matrix screen 4. In an implementation scheme, the LED dot-matrix screen 4 integrates a driver chip with SPI communication function, such as an SC5250 driver chip, and the SC5250 chip is a single-chip dot-matrix screen driver integrating a screen display controller and a driver. The SC5250 chip supports the connection scheme of an eight-bit parallel interface or a four-wire serial interface (SPI-4), and in an implementable scheme, the connection scheme of the four-wire serial interface (SPI-4) is mainly selected for use because signal transmission between parallel ports has mutual interference, so that the LED dot matrix screen integrated with the SC5250 chip is driven. The display data transmitted from the control module 1 is stored in a Display Data RAM (DDRAM) within the SC5250 chip, the capacity of the display data RAM is 65 × 132 bits, and the display data bits stored in the DDRAM are directly connected to the LED pixels of the LED dot matrix panel 4. The SC5250 chip comprises 132 segment outputs, 64 general outputs and 1 icon general output, an oscillating circuit and a low-power-consumption power circuit are arranged in the chip, and a screen driving signal can be generated without an external clock or a power supply, so that fewer components are needed by the LED dot matrix screen 4, and the power consumption is low. Referring to fig. 1, a pin B1, a pin B2, a pin B3, and a pin B4 are respectively indicated as a signal output terminal of the signal conversion chip 3, a pin CS0, a pin CD, a pin SCK, and a pin SDA are respectively indicated as SPI signal input terminals of the LED dot matrix screen 4, and a pin B1, a pin B2, a pin B3, and a pin B4 of the signal conversion chip 3 are electrically connected to a pin CS0, a pin CD, a pin SCK, and a pin SDA of the LED dot matrix screen 4 one by one.
Because the power supply level of LED dot matrix screen needs 3.3V, after control module 1 was gone up the electricity, set for control module 1's output level to be 1.8V, control module 1 output 1.8V level's SPI signal, rethread signal conversion chip 3 carries out level conversion output 3.3V's SPI signal to be used for driving LED dot matrix screen 4.
In an implementation scheme, referring to fig. 2, the driving circuit further includes a first TVS tube 25, one end of a negative electrode of the first TVS tube 25 is electrically connected to the pin B1 of the signal conversion chip 3, the other end of the negative electrode is electrically connected to the pin CS0 of the LED dot matrix panel 4, and an anode of the first TVS tube 25 is grounded. When the two ends of the cathode of the first TVS tube 25 are subjected to the transient high-energy impact, the impedance value between the two ends is changed from high impedance to low impedance at a speed of PS seconds, so as to absorb a transient large current, and the voltage between the two ends is clamped at a predetermined value, thereby protecting the LED dot matrix screen 4 and related circuits from the impact of the transient high-voltage spike pulse. It should be noted that although not shown in fig. 2, a TVS diode is also connected between the pin B2 and the pin CD, between the pin B3 and the pin SCK, and between the pin B4 and the pin SDA, and the connection manner of the TVS diode is completely consistent with that of the pin B1 and the first TVS tube 25, which is not described herein again, and the TVS diodes are also used for absorbing transient large current to protect the LED dot matrix panel 4 and related circuits.
The voltage input terminal of the voltage converting chip 2 is electrically connected to a power supply, referring to fig. 1, the IN pin is represented as the voltage input terminal of the voltage converting chip 2, the OUT pin is represented as the voltage output terminal of the voltage converting chip 2, the voltage converting chip 2 is configured to perform level conversion on the voltage of the power supply, and IN an implementable scheme, the signal level output by the OUT pin of the voltage converting chip 2 is 3.3V.
IN an implementation, referring to fig. 2, the driving circuit further includes a transistor 21, an emitter of the transistor 21 is electrically connected to the LCD _ RST pin of the control module 1, a base of the transistor 21 is electrically connected to the IN pin of the voltage converting chip 2, and a collector of the transistor 21 is electrically connected to the OUT pin of the voltage converting chip 2. It should be noted that, the transistor 21 has no requirement on the input level and the output level, and the applicability is strong, in this embodiment, the input signal is the low level of 1.8V, the transistor 21 is turned off, and the level of the output signal of the transistor 21 is pulled up to be consistent with the signal level output by the OUT pin of the voltage conversion chip 2, that is, 3.3V, although this embodiment may also be used to convert the high level to the low level.
The OUT pin of the voltage conversion chip 2 is further electrically connected to the voltage input terminal and the reset pin of the LED dot-matrix screen 4, respectively, referring to fig. 1, the VDD pin is represented as the voltage input terminal of the LED dot-matrix screen 4, the RST pin is represented as the reset pin of the LED dot-matrix screen 4, and the voltage conversion chip 2 outputs a power supply voltage signal and a reset signal of 3.3V level for driving the LED dot-matrix screen 4.
IN an implementation, referring to fig. 2, the driving circuit includes a first resistor 28 and a second resistor 29, the first resistor 28 is connected IN series between the IN pin of the voltage conversion chip 2 and the base of the transistor, the first resistor 28 is used for clamping the voltage difference between the base and the emitter IN the voltage drop of the transistor 21 after the transistor is turned on, for example, 0.7V, and the first resistor 28 shares the remaining voltage; the second resistor 29 is connected in series between the OUT pin of the voltage conversion chip 2 and the reset pin of the LED dot matrix screen, and the second resistor 29 is used for limiting the current difference Ice between the emitter and the collector when the triode is turned on, so as to prevent the triode 21 from being burnt OUT due to too large Ice current.
In an implementation scheme, referring to fig. 2, the driving circuit further includes a second TVS tube 26, one end of a negative electrode of the second TVS tube 26 is electrically connected to the RST pin of the LED dot matrix panel, the other end is electrically connected to the OUT pin of the voltage converting chip 2, and a positive electrode thereof is grounded. The second TVS tube 26 is used for absorbing a transient large current to protect the LED dot matrix screen and related circuits.
The voltage output terminal of the control module 1 is electrically connected to the voltage input terminal of the signal conversion chip 3, the voltage output terminal of the signal conversion chip 3 is electrically connected to the OUT pin of the voltage conversion chip 2, referring to fig. 1, the VCCA pin is represented as the voltage input terminal of the signal conversion chip 3, the VCCB pin is represented as the voltage output terminal of the signal conversion chip 3, and the CAT1_ VEXT _1V8 pin is represented as the voltage output terminal of the control module 1. It should be noted that the VCCA pin can accept any power supply voltage in the range of 1.2V to 3.6V, and the VCCB pin can accept any power supply voltage in the range of 1.65V to 5.5V. In this embodiment, the VCCA pin is a system of 1.8V, and the VCCB pin is a system of 3.3V.
In an implementable scheme, referring to fig. 2, the driving circuit includes a first capacitor 22 and a second capacitor 23, both the first capacitor 22 and the second capacitor 23 are connected in parallel in the circuit, specifically, one end of the first capacitor 22 is electrically connected to the VCCA end of the voltage conversion chip 2, and the other end is grounded; one end of the second capacitor 23 is electrically connected to the VCCB end of the voltage converting chip 2, and the other end is grounded. When the voltage fluctuates, the first capacitor 22 and the second capacitor 23 respectively store energy at the wave crest of the voltage and release the energy at the wave trough, so that the fluctuation of the voltage is reduced, the voltage waveform is nearly flat, and the filtering effect is realized.
In an implementation, referring to fig. 2, the driving circuit further includes a third capacitor 24 and a third TVS tube 27. The third capacitor 24 is connected in parallel in the circuit, specifically, one end of the third capacitor 24 is electrically connected with a VDD pin of the LED dot matrix screen, the other end is grounded, and the third capacitor 24 also plays a role in filtering. One end of the negative electrode of the third TVS tube 27 is electrically connected to the VDD pin of the LED dot matrix screen 4, the other end is electrically connected to the OUT pin of the voltage conversion chip 2, and the positive electrode is grounded. The third TVS tube 27 is also used to absorb the transient large current to protect the LED dot matrix screen and related circuits.
Referring to fig. 1, LCDBK _ LED pins of the control module 1 are electrically connected to three LED signal pins of the LED dot matrix screen 4, respectively, and R _ LED pins, G _ LED pins, and B _ LED pins are represented as three LED signal pins of the LED dot matrix screen 4, respectively. In an implementation scheme, a signal output by any one I/O pin of the control module 1, such as an LED driving signal, may be subjected to level conversion through the switch tube 31, specifically, referring to fig. 3, a gate of the switch tube 31 is electrically connected to a first I/O pin of the control module 1, a drain of the switch tube 31 is electrically connected to an R _ LED pin, a G _ LED pin, and a B _ LED pin of the LED dot matrix screen, respectively, and a source of the switch tube is grounded, so as to implement driving of a three-color lamp of the LED dot matrix screen 4. The first I/O pin is any one of the I/O pins of the control module 1, for example, in fig. 3, the LCDBK _ LED pin of the control module 1 is represented as the first I/O pin.
The level of the LED driving signal output from the LCDBK _ LED pin of the control module 1 is converted through the switching tube 31 to obtain a 3.3V level LED driving signal, and the LED driving signal is used for driving the LED dot matrix screen 4.
In an implementable solution, see fig. 3, the driving circuit further comprises a third resistor 32 and a fourth capacitor 33. The third resistor 32 is connected in series between the gate of the switching tube 31 and the LCDBK _ LED pin of the control module 1, and the third resistor 32 is used for stabilizing the voltage on the signal line. One end of the fourth capacitor 33 is electrically connected to the gate of the switching tube 31, and the other end is grounded, and the fourth capacitor 33 also has a filtering function.
This embodiment realizes the drive to different functions in the LED dot matrix screen through different level conversion modes, specifically, to the higher SPI signal of signal communication quality requirement use signal conversion chip to carry out level conversion, to reset signal and supply voltage signal use voltage conversion chip to carry out level conversion, and to the available switch tube of the lower LED drive signal of communication quality requirement carry out level conversion, thereby realize the drive to the LED dot matrix screen, simultaneously under the prerequisite of ensureing communication quality, the cost of whole circuit has been reduced.
Example 2
The present embodiment provides an electronic device including an LED dot matrix screen and a driving circuit of the LED dot matrix screen as described in embodiment 1.
Except for the connection mode of the driving circuit of the LED dot-matrix panel and the LED dot-matrix panel described in embodiment 1, other necessary related pins for the LED dot-matrix panel, such as VSS pin of the LED dot-matrix panel is normally grounded, NC pin is floating, and V0 pin and XV0 pin are connected in series through a capacitor, are common connection schemes for those skilled in the art, and are not limited herein.
Although specific embodiments of the present invention have been described above, it will be understood by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (10)
1. The utility model provides a drive circuit of LED dot matrix screen which characterized in that, drive circuit includes control module, voltage conversion chip, switch tube and signal conversion chip:
the voltage conversion chip is used for carrying out level conversion on input voltage, and the signal conversion chip is used for carrying out level conversion on input signals;
the signal input end of the signal conversion chip is electrically connected with the SPI signal output end of the control module, and the signal output end of the signal conversion chip is electrically connected with the SPI signal input end of the LED dot matrix screen;
the grid electrode of the switch tube is electrically connected with a first I/O pin of the control module, the drain electrode of the switch tube is respectively electrically connected with three LED signal pins of the LED dot matrix screen, and the source electrode of the switch tube is grounded;
the voltage input end of the voltage conversion chip is electrically connected with a power supply, and the voltage output end of the voltage conversion chip is electrically connected with the reset pin of the control module and the reset pin of the LED dot matrix screen respectively.
2. The LED dot matrix screen driving circuit according to claim 1, wherein said driving circuit further comprises a transistor,
and the emitting electrode of the triode is electrically connected with a reset pin of the control module, the base electrode of the triode is electrically connected with the voltage input end of the voltage conversion chip, and the collecting electrode of the triode is electrically connected with the reset pin of the LED dot matrix screen.
3. The driving circuit of the LED dot matrix screen according to claim 1, wherein a voltage input terminal of the signal conversion chip is electrically connected to a voltage output terminal of the control module;
and the voltage output end of the signal conversion chip is electrically connected with the voltage output end of the voltage conversion chip.
4. The driving circuit of the LED dot matrix screen according to claim 3, wherein the driving circuit further comprises a first capacitor, one end of the first capacitor is electrically connected to the voltage input terminal of the signal conversion chip, and the other end of the first capacitor is grounded; and/or the presence of a gas in the gas,
the driving circuit further comprises a second capacitor, one end of the second capacitor is electrically connected with the voltage output end of the signal conversion chip, and the other end of the second capacitor is grounded.
5. The LED dot matrix screen driving circuit according to claim 1, further comprising a third capacitor having one end electrically connected to the voltage input terminal of the LED dot matrix screen and the other end grounded.
6. The driving circuit of the LED dot matrix screen according to claim 1, wherein the driving circuit further comprises a first TVS tube, a negative electrode of the first TVS tube is electrically connected to the signal output terminal of the signal conversion chip, and a positive electrode thereof is grounded; and/or the presence of a gas in the gas,
the driving circuit further comprises a second TVS tube, wherein the cathode of the second TVS tube is electrically connected with the reset pin of the LED dot matrix screen, and the anode of the second TVS tube is grounded; and/or the presence of a gas in the atmosphere,
the drive circuit further comprises a third TVS tube, the negative electrode of the third TVS tube is electrically connected with the voltage input end of the LED dot matrix screen, and the positive electrode of the third TVS tube is grounded.
7. The LED dot matrix panel driving circuit according to claim 2, further comprising a first resistor connected in series between the voltage input terminal of the voltage converting chip and the base of the transistor; and/or the presence of a gas in the gas,
the driving circuit further comprises a second resistor which is connected in series between the voltage output end of the voltage conversion chip and the reset pin of the LED dot matrix screen.
8. The driving circuit of the LED dot matrix screen as claimed in claim 1, wherein the driving circuit further comprises a third resistor connected in series between the gate of the switching tube and the first I/O pin of the control module; and/or the presence of a gas in the gas,
the driving circuit further comprises a fourth capacitor, one end of the fourth capacitor is electrically connected with the grid electrode of the switching tube, and the other end of the fourth capacitor is grounded.
9. The driving circuit of the LED dot matrix screen according to claim 1, wherein the LED dot matrix screen integrates a driving chip with SPI communication function.
10. An electronic device, characterized in that the electronic device comprises an LED dot matrix screen and a driving circuit of the LED dot matrix screen as claimed in claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123363519.0U CN217279981U (en) | 2021-12-29 | 2021-12-29 | Drive circuit and electronic equipment of LED dot matrix screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123363519.0U CN217279981U (en) | 2021-12-29 | 2021-12-29 | Drive circuit and electronic equipment of LED dot matrix screen |
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| Publication Number | Publication Date |
|---|---|
| CN217279981U true CN217279981U (en) | 2022-08-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123363519.0U Active CN217279981U (en) | 2021-12-29 | 2021-12-29 | Drive circuit and electronic equipment of LED dot matrix screen |
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| Country | Link |
|---|---|
| CN (1) | CN217279981U (en) |
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2021
- 2021-12-29 CN CN202123363519.0U patent/CN217279981U/en active Active
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