CN103390382B - The control system of adaptive LED display screen - Google Patents
The control system of adaptive LED display screen Download PDFInfo
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- CN103390382B CN103390382B CN201210145672.2A CN201210145672A CN103390382B CN 103390382 B CN103390382 B CN 103390382B CN 201210145672 A CN201210145672 A CN 201210145672A CN 103390382 B CN103390382 B CN 103390382B
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Abstract
The invention discloses the control system of adaptive LED display screen, form primarily of step-down filter rectifier and the mu balanced circuit be connected with step-down filter rectifier and switch regulating circuit, described mu balanced circuit and switch regulating circuit are connected with central processing system simultaneously, described central processing system is connected with luminous environment testing circuit, and described switch regulating circuit is also connected with LED column driver circuitry, LED display in turn; Described switch regulating circuit and central processing system are directly provided with pwm circuit; The invention has the advantages that: structure is simple, can reduce energy resource consumption, automatically can carry out control adjustment according to exterior light environment.
Description
Technical field
The present invention relates to the automatic control of LED display, specifically refer to the control system of luminous environment adaptive LED display screen.
Background technology
LED display (LED panel): LED is exactly light emitting diode, the english abbreviation of light emitting diode, is called for short LED.It is a kind of display mode by controlling semiconductor light-emitting-diode, and its general appearance is exactly be made up of a lot of individual normally red light emitting diode, and the light on and off by lamp show character.Be used for showing the display screen of the various information such as word, figure, image, animation, market, video, video signal.
LED display (LEDdisplay, LED Screen): be again electronic display or the word screen that wafts.Be made up of LED dot matrix, logical
Cross redness, blue, the light on and off of green LED lamp show word, picture, animation, video, and content can be changed at any time, and each several part assembly is all the display device of modular construction.Usually be made up of display module, control system and power-supply system.The dot matrix that display module is made up of LED is formed, and is responsible for luminescence display; Control system, by controlling the light on and off of respective regions, can allow the contents such as screen displaying character, picture, video, Zhongshan city is bright opens up the monochrome of photoelectricity, double-colored screen is mainly used to play word, full-color screen mainly playing animation; Power-supply system is responsible for input voltage and input current being transferred to display screen required voltage electric current.
Why in widespread attention LED is and developed rapidly, is that the advantage that has with itself is inseparable.These advantages sum up and are: brightness is high, operating voltage is low, power consumption is little, miniaturization, life-span are long, shock-resistant and stable performance.The development prospect of LED is very wide, at present just towards more high brightness, more high weather resistance, higher luminous density, higher uniformity of luminance, and reliability, panchromaticization future development.
But, because the display brightness of LED can not change with external environmental light, there is display on daytime unclear or night because of too bright and dazzling problem.If can realize controlling its brightness, not only can save the energy, the display effect of display screen can also be made more clear.
Summary of the invention
The object of the present invention is to provide a kind of control system that automatically can change the luminous environment adaptive LED display screen of the bright intensity of LED light according to ambient light conditions.
Implementation of the present invention is as follows: the control system of adaptive LED display screen, form primarily of step-down filter rectifier and the mu balanced circuit be connected with step-down filter rectifier and switch regulating circuit, described mu balanced circuit and switch regulating circuit are connected with central processing system simultaneously, described central processing system is connected with luminous environment testing circuit, and described switch regulating circuit is also connected with LED column driver circuitry, LED display in turn; Pwm circuit is provided with between described switch regulating circuit and central processing system;
Described switch regulating circuit comprises the triode D1 being connected to pwm circuit; 1 pin of described triode D1 is connected with pwm circuit, and 3 pins of triode D1 are connected with triode D2 and are connected with 1 pin of triode D2, the 2 pin ground connection of described triode D1; Described triode D2 is parallel with diode 1N4148, and the two ends of diode 1N4148 are connected with 2 pins respectively at 1 pin of triode D2, and 1 pin of described triode D2 is connected with V0 end; 3 pins of described triode D2 are connected with rectifier IRFI 9540N, and be connected with 1 pin of rectifier IRFI 9540N, described 2 pins of rectifier IRFI 9540N are connected with 2 pins of triode D2,3 pins of rectifier IRFI 9540N are connected with vdd terminal, and described vdd terminal is connected with 2 pins of triode D1, and 2 pins of described triode D1 are also connected with electric capacity C1 in parallel mutually and electric capacity C2, described electric capacity C1 and electric capacity C2 are also connected with 3 pins of rectifier IRFI 9540N.
Described central processing system is MSP430F169 Single Chip Microcomputer (SCM) system.
Described MSP430F169 Single Chip Microcomputer (SCM) system is also connected with RS485 communication interface circuit; Described RS485 communication interface circuit is also connected with mu balanced circuit.
Described RS485 communication interface circuit is also connected with upper PC.
MSP430F169 Single Chip Microcomputer (SCM) system comprises MSP430F169 chip, Dvcc with the AVcc pin of described MSP430F169 chip is connected with VSS.
The P4.1/TB1 pin of described MSP430F169 chip is connected with PWM plate, and described PWM plate is connected with switch regulating circuit again.
Described LED column driver circuitry is monochromatic common anode pole LED drive circuit.
The design adopts row to send data, and the mode of line scanning realizes LED and shows word or image.This method combines with hardware circuit, reaches the object that display screen overall brightness is relatively uniform.
Luminous environment testing circuit utilizes photoresistance to the sensitivity characteristic of surround lighting, gather the changing condition of surround lighting, convert thereof into electric signal and be sent in single-chip microcomputer MSP430F169 chip, carry out signal transacting by single-chip microcomputer MSP430F169 chip, and control according to certain rule the dutycycle exporting PWM ripple.
Between single-chip microcomputer MSP430F169 chip and LED display screen, add a switch regulating circuit, realize single-chip microcomputer MSP430F169 chip to the brightness adjustment of display screen.PWM ripple after adjustment is controlled switch regulating circuit, thus regulates the size of the input voltage of display screen, finally realize the brilliance control of display screen.
The design's introduction be the ambient light adaptive LED display screen utilizing MSP430F169 Single Chip Microcomputer (SCM) system to control, this screen the power of environmentally light can adjust brightness automatically, to avoid showing unclear or night daytime because of too bright and dazzling, and communicate with upper PC.LED display applications field is extensive, as large-scale places such as market, public place of entertainment, factory, schools, has practical value and good development prospect to its research.
The invention has the advantages that: structure is simple, can reduce energy resource consumption, automatically can carry out control adjustment according to exterior light environment.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present invention.
Fig. 2 is the circuit diagram of MSP430F169 Single Chip Microcomputer (SCM) system in the present invention.
Fig. 3 is the circuit diagram of breaker in middle regulating circuit of the present invention.
Embodiment
Embodiment one
As shown in Figure 1, 2.
The control system of adaptive LED display screen, form primarily of step-down filter rectifier and the mu balanced circuit be connected with step-down filter rectifier and switch regulating circuit, described mu balanced circuit and switch regulating circuit are connected with central processing system simultaneously, described central processing system is connected with luminous environment testing circuit, and described switch regulating circuit is also connected with LED column driver circuitry, LED display in turn; Pwm circuit is provided with between described switch regulating circuit and central processing system;
Described switch regulating circuit comprises the triode D1 being connected to pwm circuit; 1 pin of described triode D1 is connected with pwm circuit, and 3 pins of triode D1 are connected with triode D2 and are connected with 1 pin of triode D2, the 2 pin ground connection of described triode D1; Described triode D2 is parallel with diode 1N4148, and the two ends of diode 1N4148 are connected with 2 pins respectively at 1 pin of triode D2, and 1 pin of described triode D2 is connected with V0 end; 3 pins of described triode D2 are connected with rectifier IRFI 9540N, and be connected with 1 pin of rectifier IRFI 9540N, described 2 pins of rectifier IRFI 9540N are connected with 2 pins of triode D2,3 pins of rectifier IRFI 9540N are connected with vdd terminal, and described vdd terminal is connected with 2 pins of triode D1, and 2 pins of described triode D1 are also connected with electric capacity C1 in parallel mutually and electric capacity C2, described electric capacity C1 and electric capacity C2 are also connected with 3 pins of rectifier IRFI 9540N.
Described central processing system is MSP430F169 Single Chip Microcomputer (SCM) system.
Described MSP430F169 Single Chip Microcomputer (SCM) system is also connected with RS485 communication interface circuit; Described RS485 communication interface circuit is also connected with mu balanced circuit.
Described RS485 communication interface circuit is also connected with upper PC and connects.
MSP430F169 Single Chip Microcomputer (SCM) system comprises MSP430F169 chip, Dvcc with the AVcc pin of described MSP430F169 chip is connected with VSS.
The P4.1/TB1 pin of described MSP430F169 chip is connected with PWM plate, and described PWM plate is connected with switch regulating circuit again.
Described LED column driver circuitry is monochromatic common anode pole LED drive circuit.
The design adopts row to send data, and the mode of line scanning realizes LED and shows word or image.This method combines with hardware circuit, reaches the object that display screen overall brightness is relatively uniform.
Luminous environment testing circuit utilizes photoresistance to the sensitivity characteristic of surround lighting, gather the changing condition of surround lighting, convert thereof into electric signal and be sent in single-chip microcomputer MSP430F169 chip, carry out signal transacting by single-chip microcomputer MSP430F169 chip, and control according to certain rule the dutycycle exporting PWM ripple.
Between single-chip microcomputer MSP430F169 chip and LED display screen, add a switch regulating circuit, realize single-chip microcomputer MSP430F169 chip to the brightness adjustment of display screen.PWM ripple after adjustment is controlled switch regulating circuit, thus regulates the size of the input voltage of display screen, finally realize the brilliance control of display screen.
As shown in Figure 3, switch regulating circuit: utilize two NPN transistor npn npn composition see-saw circuits to be amplified by ripple to realize PMOS switching tube, the size of the average voltage of display screen is acted on the ON time control VDD of PWM ripple adjustment PMOS switching tube, and then the brightness of control LED.
For preventing the fluctuation of network voltage from impacting display screen, therefore form dividing potential drop metering circuit with fixed value resistance R4 and R5, accurate Survey control is carried out to voltage, for realizing the reliable and stable of screen voltage,
The design's introduction be the ambient light adaptive LED display screen utilizing MSP430F169 Single Chip Microcomputer (SCM) system to control, this screen the power of environmentally light can adjust brightness automatically, to avoid showing unclear or night daytime because of too bright and dazzling, and communicate with upper PC.LED display applications field is extensive, as large-scale places such as market, public place of entertainment, factory, schools, has practical value and good development prospect to its research.
As mentioned above, then well the present invention can be realized.
Claims (7)
1. the control system of adaptive LED display screen, it is characterized in that: form primarily of step-down filter rectifier and the mu balanced circuit be connected with step-down filter rectifier and switch regulating circuit, described mu balanced circuit and switch regulating circuit are connected with central processing system simultaneously, described central processing system is connected with luminous environment testing circuit, and described switch regulating circuit is also connected with LED column driver circuitry, LED display in turn; Pwm circuit is provided with between described switch regulating circuit and central processing system;
Described switch regulating circuit comprises the triode D1 being connected to pwm circuit; 1 pin of described triode D1 is connected with pwm circuit, and 3 pins of triode D1 are connected with triode D2 and are connected with 1 pin of triode D2, the 2 pin ground connection of described triode D1; Described triode D2 is parallel with diode 1N4148, and the two ends of diode 1N4148 are connected with 1 pin of triode D2 and 2 pins respectively, and 1 pin of described triode D2 is connected with V0 end; 3 pins of described triode D2 are connected with rectifier IRFI 9540N, and be connected with 1 pin of rectifier IRFI 9540N, described 2 pins of rectifier IRFI 9540N are connected with 2 pins of triode D2,3 pins of rectifier IRFI 9540N are connected with vdd terminal, and described vdd terminal is connected with 2 pins of triode D1, and 2 pins of described triode D1 are also connected with electric capacity C1 in parallel mutually and electric capacity C2, described electric capacity C1 and electric capacity C2 are also connected with 3 pins of rectifier IRFI 9540N; In switch regulating circuit, 1 pin of triode D1 is connected with PWM circuit by resistance R1; 1 pin of triode D2 is held by resistance R2 and V0 and is connected; 2 pins of rectifier IRFI9540N are connected with 2 pins of triode D2 by resistance R3; VDD end is by 2 pins of connecting triode D1 after resistance R4, the resistance R5 of series connection.
2. the control system of adaptive LED display screen according to claim 1, is characterized in that: described central processing system is MSP430F169 Single Chip Microcomputer (SCM) system.
3. the control system of adaptive LED display screen according to claim 2, is characterized in that: described MSP430F169 Single Chip Microcomputer (SCM) system is also connected with RS485 communication interface circuit; Described RS485 communication interface circuit is also connected with mu balanced circuit.
4. the control system of adaptive LED display screen according to claim 3, is characterized in that: described RS485 communication interface circuit is also connected with upper PC.
5. the control system of adaptive LED display screen according to claim 2, is characterized in that: MSP430F169 Single Chip Microcomputer (SCM) system comprises MSP430F169 chip, DVcc with the AVcc pin of described MSP430F169 chip is connected with VSS.
6. the control system of adaptive LED display screen according to claim 5, is characterized in that: the P4.1/TB1 pin of described MSP430F169 chip is connected with PWM plate, and described PWM plate is connected with switch regulating circuit again.
7. according to the control system of the adaptive LED display screen in claim 1-6 described in any one, it is characterized in that: described LED column driver circuitry is monochromatic common anode pole LED drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210145672.2A CN103390382B (en) | 2012-05-11 | 2012-05-11 | The control system of adaptive LED display screen |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210145672.2A CN103390382B (en) | 2012-05-11 | 2012-05-11 | The control system of adaptive LED display screen |
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| CN103390382A CN103390382A (en) | 2013-11-13 |
| CN103390382B true CN103390382B (en) | 2015-08-19 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104008728B (en) * | 2014-06-10 | 2016-03-30 | 晶彩（福建）光电有限公司 | A kind of LED display engine |
| CN105405391A (en) * | 2015-11-20 | 2016-03-16 | 芜湖锐芯电子科技有限公司 | Voltage stabilization and recognition LED circuit |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7733035B2 (en) * | 2008-02-01 | 2010-06-08 | Hao-Chin Pai | Electronic power supply device for light-emitting diode |
| US20100045206A1 (en) * | 2008-08-20 | 2010-02-25 | Chuang Sheng-Yi | LED Driving Circuit |
| CN201247577Y (en) * | 2008-09-03 | 2009-05-27 | 长春希达电子技术有限公司 | Device for adjusting display parameter of LED display screen |
| CN201465520U (en) * | 2009-03-31 | 2010-05-12 | 慧明光电(深圳)有限公司 | Automatic brightness control device of vehicle-mounted multimedia display screen |
| CN201449716U (en) * | 2009-05-27 | 2010-05-05 | 无锡和晶科技股份有限公司 | LED display capable of automatically regulating luminance |
| CN202111893U (en) * | 2011-07-04 | 2012-01-11 | 冯军 | LED power supply circuit |
| CN202563870U (en) * | 2012-05-11 | 2012-11-28 | 四川优的科技有限公司 | Self-adaptive control system of LED display screen |
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Granted publication date: 20150819 Termination date: 20160511 |