CN107301838A - The drive circuit of light-emitting diode display - Google Patents
The drive circuit of light-emitting diode display Download PDFInfo
- Publication number
- CN107301838A CN107301838A CN201710683012.2A CN201710683012A CN107301838A CN 107301838 A CN107301838 A CN 107301838A CN 201710683012 A CN201710683012 A CN 201710683012A CN 107301838 A CN107301838 A CN 107301838A
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- pins
- display
- microcontroller
- max232
- emitting diode
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
Abstract
The invention discloses the drive circuit of light-emitting diode display, including PC, serial communication module, microcontroller, decoding circuit, display driver circuit and the light-emitting diode display being sequentially connected, the PC is for storing and handling display content；The serial communication module is used to transmit display content and control instruction to microcontroller；The microcontroller is used to receive display content and control instruction, and display content and control instruction are transmitted to decoding circuit；The decoding circuit is used for display content and control instruction is decoded and transmitted to display driver circuit；The display driver circuit is used to drive light-emitting diode display to be shown.The present invention uses single-chip microcomputer as microcontroller, it ensure that the cost of drive system is relatively low, the display content that PC is sent out is handled successively by serial communication module, microcontroller, decoding circuit, display driver circuit, stability and accuracy that light-emitting diode display is shown is improved.
Description
Technical field
The present invention relates to circuit of display driving, and in particular to the drive circuit of light-emitting diode display.
Background technology
The novel information that LED display is the late nineteen eighties to be developed rapidly in the whole world shows media, display screen by
The tens of thousands of or even evenly distributed composition of hundreds of thousands semiconductor light-emitting-diode pixel.Difference can be manufactured using different materials
The LED pixel point of color.Most widely used at present is red, green, yellow.And the exploitation of blueness and pure green LED has reached
To the practical stage.LED display can show the numeral of change, word, graph image；It can be not only used for indoor environment also
It can be used for outdoor environment, have the advantages that projecting apparatus, video wall, LCDs are incomparable.It is short about ten years in,
LED dot matrix display screens are just with the excellent of brightness height, low operating voltage, small power consumption, miniaturization, long lifespan, impact resistance and performance stabilization
Point shoots up as the main product of FPD, is widely used in field of information display.
LED development prospect is extremely wide, at present just towards more high brightness, more high weather resistance, higher luminous density,
Higher uniformity of luminance, reliability, panchromaticization direction are developed.The application of LED display is related to many fields of social economy,
Mainly include：(1) securities trading, Financial Information are shown.(2) air station flight multidate information is shown.(3) harbour, station passenger are drawn
Lead presentation of information.(4) stadiums presentation of information.(5) Traffic Information is shown.(6) Dispatch and Command Center's presentation of information.
(7) service propaganda and presentation of information of the service field such as postal service, telecommunications, market shopping center.(8) advertising media's new product etc..
As environment is more severe, the service life of the existing light-emitting diode display for being in outdoor can shorten, and its brightness is also not sufficiently stable,
Urgently improve.
The content of the invention
The technical problems to be solved by the invention are that existing light-emitting diode display service life shortens, and brightness is not sufficiently stable, purpose
It is the drive circuit that light-emitting diode display is provided, improves the service life of light-emitting diode display, it is ensured that the stable display of light-emitting diode display.
The present invention is achieved through the following technical solutions：
The drive circuit of light-emitting diode display, including PC, serial communication module, microcontroller, the decoding electricity being sequentially connected
Road, display driver circuit and light-emitting diode display, the PC are used to storing and handling display content；The serial communication module is used
Transmitted in by display content and control instruction to microcontroller；The microcontroller is used to receive display content and control refers to
Order, and display content and control instruction are transmitted to decoding circuit；The decoding circuit is used for display content and control instruction is translated
Code is simultaneously transmitted to display driver circuit；The display driver circuit is used to drive light-emitting diode display to be shown.
Further, microcontroller uses chip processor AT89S51.
Further, serial communication module include electrical level transferring chip U1, D type nine kinds of needles plug U2, electric capacity C1, electric capacity C2,
Electric capacity C3, electric capacity C4, the electrical level transferring chip U1 use MAX232, and 1 pin and 3 that the electric capacity C1 is connected to MAX232 draws
Between pin；The electric capacity C2 is connected between MAX232 4 pins and 5 pins；Described electric capacity C3 one end is connected to the 2 of MAX232
Pin；Described electric capacity C4 one end connects MAX232 6 pins, its other end connection D type nine kinds of needles plugs U2 the 5th pin；MAX232
7 pins and D type nine kinds of needles plugs U2 the 7th pin；MAX232 8 pins and D type nine kinds of needles plugs U2 the 4th pin；MAX232's
10 pins receive the information that microcontroller is sent；MAX232 9 pins send information to microcontroller；The D types nine kinds of needles plug
U2 connection PCs.
Further, decoding circuit includes deserializer U3, latch U4, potentiometer R1, resistance R2, resistance R3, three
Pole pipe T1, triode T2, the deserializer U3 use 74LS164, the latch U4 to use 74LS373,74LS164's
8 output pins and 7,4LS,373 8 data receiver pins are sequentially connected；Described resistance R3 one end and 7,4LS,373 19 pins
Connection, its other end is connected with triode T2 base stage, and triode T2 emitter stage is connected with potentiometer R1 movable end；It is described
Potentiometer R1 fixing end connection power supply, another fixing end is connected with triode T1 emitter stage；Resistance R2 one end with
74LS373 2 pins connection, the other end is connected with triode T1 base stage；Triode T1 colelctor electrode and triode T2 collection
Electrode connects display driver circuit；74LS164 receives the clock signal and data-signal of microcontroller.
Further, display driver circuit includes deserializer U5, driver U6, the deserializer U5 uses
74LS164, driver U6 uses ULN2803；Deserializer U5 8 output pins and ULN2803 8 input pins according to
Secondary connection；ULN2803 8 output pins connection light-emitting diode display.
The present invention compared with prior art, has the following advantages and advantages：
The present invention uses single-chip microcomputer as microcontroller, ensure that the cost of drive system is relatively low, passes through serial communication
Module, microcontroller, decoding circuit, display driver circuit are handled the display content that PC is sent out successively, are improved LED and are shown
Stability and accuracy that device is shown.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding the embodiment of the present invention, constitutes one of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is schematic structural view of the invention；
Fig. 2 is serial communication module circuit diagram of the present invention；
Fig. 3 is decoding circuit schematic diagram of the present invention；
Fig. 4 is display driver circuit schematic diagram of the present invention.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment and accompanying drawing, to this
Invention is described in further detail, and exemplary embodiment and its explanation of the invention is only used for explaining the present invention, does not make
For limitation of the invention.
Embodiment
As shown in figure 1, the drive circuit of light-emitting diode display, including be sequentially connected PC, serial communication module, microcontroller
Device, decoding circuit, display driver circuit and light-emitting diode display, the PC are used to storing and handling display content；It is described serial logical
Letter module is used to transmit display content and control instruction to microcontroller；The microcontroller be used for receive display content and
Control instruction, and display content and control instruction are transmitted to decoding circuit；The decoding circuit is used for display content and control
Instruction decoding is simultaneously transmitted to display driver circuit；The display driver circuit is used to drive light-emitting diode display to be shown.
Microcontroller uses chip processor AT89S51.
As shown in Fig. 2 serial communication module include electrical level transferring chip U1, D type nine kinds of needles plug U2, electric capacity C1, electric capacity C2,
Electric capacity C3, electric capacity C4, the electrical level transferring chip U1 use MAX232, and 1 pin and 3 that the electric capacity C1 is connected to MAX232 draws
Between pin；The electric capacity C2 is connected between MAX232 4 pins and 5 pins；Described electric capacity C3 one end is connected to the 2 of MAX232
Pin；Described electric capacity C4 one end connects MAX232 6 pins, its other end connection D type nine kinds of needles plugs U2 the 5th pin；MAX232
7 pins and D type nine kinds of needles plugs U2 the 7th pin；MAX232 8 pins and D type nine kinds of needles plugs U2 the 4th pin；MAX232's
10 pins receive the information that microcontroller is sent；MAX232 9 pins send information to microcontroller；The D types nine kinds of needles plug
U2 connection PCs.
AT89S51 single-chip microcomputers have the serial UART passages of full duplex, support single-chip microcomputer to carry out the serial transmission of data.Except
Single-chip microcomputer will formulate communication protocol with PC, and the problem of determining to also need to solve outside transmission rate is exactly signal level problem.RS-
232C standards define PC and send data/address bus TXD and receive data/address bus RXD using EIA level, that is, when transmitting digital " 1 "
Level on transmission line is between -3~-15V；When transmitting digital " 0 ", the level on transmission line is between+3~+15.But it is single
It is -5V when being+5V digital " 0 "s when piece machine serial port is using positive logic Transistor-Transistor Logic level, i.e. digital " 1 ", so single-chip microcomputer and computer
Progress communication, which can not be joined directly together, to be changed RS-232C with Transistor-Transistor Logic level.
The chip of MAX232 series is high with integrated level in general electrical level transferring chip, single+5V power works, only needs outer
The converted conventional chip in SCM system between RS-232C and Transistor-Transistor Logic level can be completed by connecing 5 small capacitances.
In the display system, MAX232 is most important hardware composition part in communication system.
As shown in figure 3, decoding circuit includes deserializer U3, latch U4, potentiometer R1, resistance R2, resistance R3, three
Pole pipe T1, triode T2, the deserializer U3 use 74LS164, the latch U4 to use 74LS373,74LS164's
8 output pins and 7,4LS,373 8 data receiver pins are sequentially connected；Described resistance R3 one end and 7,4LS,373 19 pins
Connection, its other end is connected with triode T2 base stage, and triode T2 emitter stage is connected with potentiometer R1 movable end；It is described
Potentiometer R1 fixing end connection power supply, another fixing end is connected with triode T1 emitter stage；Resistance R2 one end with
74LS373 2 pins connection, the other end is connected with triode T1 base stage；Triode T1 colelctor electrode and triode T2 collection
Electrode connects display driver circuit；74LS164 receives the clock signal and data-signal of microcontroller.
The driving interface of light-emitting diode display is more, and decoding circuit is not enough in order to solve the input/output port of microcontroller
The problem of.Decoding uses chip 74LS164.If the port for not using decoding circuit to fully rely on single-chip microcomputer exports to control
It is inadequate that light-emitting diode display processed, which carries out display, and employs and 7~9 ports are needed only to after decoding circuit just can realize control
Display.I/O mouthfuls of occupancy number is greatly reduced, is that single-chip microcomputer extension other functions have stayed space in advance.74LS164 is one
The deserializer of individual 8 data.When it is low level to remove end CLEAR, output end QA-QH is low level.Serial data
Input A, B can control data.As A, B, any one is low level, then forbids new data to input, in the CLOCK pulses of clock end
The lower Q0 of rising edge effect is low level.It is high level when B has one, then another allows for input data, and rises in CLOCK
Along the state for acting on the Q0 that makes decision.
As shown in figure 4, display driver circuit includes deserializer U5, driver U6, the deserializer U5 uses
74LS164, driver U6 uses ULN2803；Deserializer U5 8 output pins and ULN2803 8 input pins according to
Secondary connection；ULN2803 8 output pins connection light-emitting diode display.
Driving uses ULN2803.ULN2803 is a kind of high-voltage large current Darlington transistor array internal structure, the array
In eight NPN Darlingtons connection transistor be low logic level digital circuit and the high-tension lamp of high current, relay, printing
Machine hammers the ideal component of the interface between load similar with other into shape.Computer is widely used in, in industry and consumer product.All devices
Part has open collector to export and the afterflow clamp diode for transient supression.Colelctor electrode power output up to 50V ×
600mA.What ULN2803 drove execution as arranging is the work of column selection, and when the row input high level of gating, its is corresponding defeated
Go out low level.Corresponding output is negated, and can provide larger sink current come absorb row driving flow out into after display screen
Electric current.
Above-described embodiment, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect
Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc. all should be included
Within protection scope of the present invention.
Claims (5)
- The drive circuit of 1.LED displays, it is characterised in that including the PC, serial communication module, microcontroller being sequentially connected Device, decoding circuit, display driver circuit and light-emitting diode display, the PC are used to storing and handling display content；It is described serial logical Letter module is used to transmit display content and control instruction to microcontroller；The microcontroller be used for receive display content and Control instruction, and display content and control instruction are transmitted to decoding circuit；The decoding circuit is used for display content and control Instruction decoding is simultaneously transmitted to display driver circuit；The display driver circuit is used to drive light-emitting diode display to be shown.
- 2. the drive circuit of light-emitting diode display according to claim 1, it is characterised in that the microcontroller uses monolithic Machine AT89S51.
- 3. the drive circuit of light-emitting diode display according to claim 1, it is characterised in that the serial communication module includes Electrical level transferring chip U1, D type nine kinds of needles plug U2, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, the electrical level transferring chip U1 are adopted It is connected to MAX232, the electric capacity C1 between MAX232 1 pin and 3 pins；The electric capacity C2 is connected to the 4 of MAX232 and drawn Between pin and 5 pins；Described electric capacity C3 one end is connected to MAX232 2 pins；Draw the 6 of electric capacity C4 one end connection MAX232 Pin, its other end connection D type nine kinds of needles plugs U2 the 5th pin；MAX232 7 pins and D type nine kinds of needles plugs U2 the 7th pin； MAX232 8 pins and D type nine kinds of needles plugs U2 the 4th pin；MAX232 10 pins receive the information that microcontroller is sent； MAX232 9 pins send information to microcontroller；The D types nine kinds of needles plug U2 connection PCs.
- 4. the drive circuit of light-emitting diode display according to claim 1, it is characterised in that the decoding circuit includes string simultaneously Converter U3, latch U4, potentiometer R1, resistance R2, resistance R3, triode T1, triode T2, the deserializer U3 are adopted 74LS373,7,4LS,164 8 output pins and 7,4LS,373 8 data receivers are used with 74LS164, the latch U4 Pin is sequentially connected；Described resistance R3 one end and 7,4LS,373 19 pins connection, the base stage of its other end and triode T2 connect Connect, triode T2 emitter stage is connected with potentiometer R1 movable end；The fixing end connection power supply of the potentiometer R1, separately One fixing end is connected with triode T1 emitter stage；Resistance R2 one end and 7,4LS,373 2 pins connection, the other end and three poles Pipe T1 base stage connection；Triode T1 colelctor electrode and triode T2 colelctor electrode connection display driver circuit；74LS164 is received The clock signal and data-signal of microcontroller.
- 5. the drive circuit of light-emitting diode display according to claim 1, it is characterised in that the display driver circuit includes Deserializer U5, driver U6, the deserializer U5 use 74LS164, driver U6 to use ULN2803；Go here and there and turn Parallel operation U5 8 output pins and ULN2803 8 input pins are sequentially connected；ULN2803 8 output pins connection LED Display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710683012.2A CN107301838A (en) | 2017-08-11 | 2017-08-11 | The drive circuit of light-emitting diode display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710683012.2A CN107301838A (en) | 2017-08-11 | 2017-08-11 | The drive circuit of light-emitting diode display |
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| Publication Number | Publication Date |
|---|---|
| CN107301838A true CN107301838A (en) | 2017-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710683012.2A Pending CN107301838A (en) | 2017-08-11 | 2017-08-11 | The drive circuit of light-emitting diode display |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109377937A (en) * | 2018-11-06 | 2019-02-22 | 深圳康佳电子科技有限公司 | LED driving method and driving circuit |
| CN109669885A (en) * | 2018-11-01 | 2019-04-23 | 广州市中海达测绘仪器有限公司 | OLED display driving system, method and storage medium |
-
2017
- 2017-08-11 CN CN201710683012.2A patent/CN107301838A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 王晓南: "基于单片机的LED点阵电子显示屏设计", 《豆丁网，HTTP://WWW.DOCIN.COM/P-970578003.HTML》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109669885A (en) * | 2018-11-01 | 2019-04-23 | 广州市中海达测绘仪器有限公司 | OLED display driving system, method and storage medium |
| CN109377937A (en) * | 2018-11-06 | 2019-02-22 | 深圳康佳电子科技有限公司 | LED driving method and driving circuit |
| CN109377937B (en) * | 2018-11-06 | 2020-12-22 | 深圳康佳电子科技有限公司 | LED driving method and driving circuit |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171027 |
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| RJ01 | Rejection of invention patent application after publication |