CN202563870U - Self-adaptive control system of LED display screen - Google Patents
Self-adaptive control system of LED display screen Download PDFInfo
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- CN202563870U CN202563870U CN2012202114075U CN201220211407U CN202563870U CN 202563870 U CN202563870 U CN 202563870U CN 2012202114075 U CN2012202114075 U CN 2012202114075U CN 201220211407 U CN201220211407 U CN 201220211407U CN 202563870 U CN202563870 U CN 202563870U
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Abstract
The utility model discloses a self-adaptive control system of an LED display screen. The self-adaptive control system of the LED display screen is composed of a voltage-reducing filtering rectification circuit, and a voltage-stabilizing circuit and a switch voltage-regulating circuit together connecting with the voltage-reducing filtering rectification circuit. The voltage-stabilizing circuit and the switch voltage-regulating circuit connect with a central processing system at the same time. The central processing system connects with a luminous environment detecting circuit. And the switch voltage-regulating circuit also connects with an LED array driving circuit and an LED display screen successively. The switch voltage-regulating circuit and the central processing system are provided with PWM circuits directly. The self-adaptive control system of the LED display screen provided by the utility model has advantages of simple structure and low energy consumption, and can realizing control and adjustment automatically according to the external luminous environment.
Description
Technical field
The utility model relates to the automatic control of LED display, specifically is meant the control system of luminous environment adaptive LED display screen.
Background technology
LED display (LED panel): LED is exactly light emitting diode, and the english abbreviation of light emitting diode is called for short LED.It is a kind of display mode through the control semiconductor light-emitting-diode, and its general appearance is exactly to be made up of a lot of normally red light emitting diodes, leans on the light on and off of lamp to come character display.Be used for the display screen of various information such as display text, figure, image, animation, market, video, video signal.
LED display (LEDdisplay, LED Screen): be electronic display again or the word screen that wafts.Form by the LED dot matrix, logical
Cross redness, blueness, the light on and off of green LED lamp come display text, picture, animation, video, and content can be changed at any time, and the each several part assembly all is the display device of modular construction.Usually form by display module, control system and power-supply system.The dot matrix that display module is made up of the LED lamp constitutes, and is responsible for luminous demonstration; Control system can let contents such as screen displaying character, picture, video through the light on and off of control respective regions, and the Zhongshan city is bright to open up the monochrome of photoelectricity, double-colored screen and mainly be used for playing literal, and full-color screen mainly is a playing animation; Power-supply system is responsible for transferring input voltage and input current to display screen required voltage electric current.
Why LED receives extensive attention and is developed rapidly, is that the advantage that had with itself is inseparable.These advantages are summarized: brightness is high, WV is low, power consumption is little, miniaturization, the life-span is long, shock-resistant and stable performance.The development prospect of LED is very wide, and at present just towards high brightness more, more high weather resistance, higher luminous density, higher uniformity of luminance, reliability, panchromaticization direction develop.
But, because the display brightness of LED can not change with external environment light, exist show daytime unclear or night because of too bright and dazzling problem.If can realize its brightness of control, not only can save the energy, can also make the display effect of display screen more clear.
The utility model content
The purpose of the utility model be to provide a kind of can be automatically according to the control system of the luminous environment adaptive LED display screen of ambient light environmental change LED light intensity.
The implementation of the utility model is following: the control system of adaptive LED display screen; Mainly constitute by step-down filter rectifier and the mu balanced circuit that is connected with the step-down filter rectifier and switch regulating circuit; Said mu balanced circuit and switch regulating circuit are connected with central processing system simultaneously; Said central processing system is connected with the luminous environment testing circuit, and said switch regulating circuit also is connected with LED ranks driving circuit, LED display in turn; Said switch regulating circuit and central processing system directly are provided with pwm circuit;
Said switch regulating circuit comprises the triode D1 that is connected in pwm circuit; 1 pin of said triode D1 is connected with pwm circuit, and 3 pins of triode D1 are connected with triode D2 and are connected the 2 pin ground connection of said triode D1 with 1 pin of triode D2; Said 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 said triode D2 is connected with the V0 end; 3 pins of said triode D2 are connected with rectifier IRF 19540N; And be connected with 1 pin of rectifier IRF 19540N; 2 pins of said rectifier IRF 19540N are connected with 2 pins of triode D2, and 3 pins of rectifier IRF 19540N are connected with vdd terminal, and said vdd terminal is connected with 2 pins of triode D1; And 2 pins of said triode D1 also are connected with the capacitor C 1 and capacitor C 2 of mutual parallel connection, and said capacitor C 1 also is connected with 3 pins of rectifier IRF 19540N with capacitor C 2.
Said central processing system is the MSP430F169 SCM system.
Said MSP430F169 SCM system also is connected with the RS485 communication interface circuit; Said RS485 communication interface circuit also is connected with mu balanced circuit.
Said RS485 communication interface circuit also is connected with upper PC and connects.
The MSP430F169 SCM system comprises the MSP430F169 chip, and the Dvcc of said MSP430F169 chip is connected with mu balanced circuit with the AVcc pin.
The P4.1/TB1 pin of said MSP430F169 chip is connected with the PWM plate, and said PWM plate is connected with the switch regulating circuit again.
Said LED ranks driving circuit is monochromatic anode led drive circuit altogether.
The design adopts row to send data, and the mode of line scanning realizes LED display text or image.This method combines with hardware circuit, reaches display screen overall brightness purpose relatively uniformly.
The luminous environment testing circuit utilizes the sensitivity characteristic of photoresistance to surround lighting; Gather the changing condition of surround lighting; Convert thereof into electric signal and be sent in the single-chip microcomputer MSP430F169 chip; Carry out signal Processing by single-chip microcomputer MSP430F169 chip, and export the dutycycle of PWM ripple according to certain rules control.
Between single-chip microcomputer MSP430F169 chip and LED display screen, add a switch regulating circuit, realize of the brightness adjustment of single-chip microcomputer MSP430F169 chip display screen.Adjusted PWM ripple is controlled the switch regulating circuit, thereby the size of regulating the input voltage of display screen finally realizes the brilliance control of display screen.
The design's introduction be the ambient light adaptive LED display screen that utilizes MSP430F169 SCM system control; This screen can be according to the strong and weak brightness of adjustment automatically of surround lighting; With avoid showing daytime unclear or night because of too bright and dazzling, and communicate with upper PC.LED display applications field is extensive, like large-scale places such as market, public place of entertainment, factory, schools, its research is had practical value and bright development prospect.
The advantage of the utility model is: simple in structure, can reduce energy resource consumption, and can control adjustment according to the exterior light environment automatically.
Description of drawings
Fig. 1 is the utility model one-piece construction synoptic diagram.
Fig. 2 is the circuit diagram of MSP430F169 SCM system in the utility model.
Fig. 3 is the circuit diagram of switch regulating circuit in the utility model.
Embodiment
Embodiment one
Like Fig. 1, shown in 2.
The control system of adaptive LED display screen; Mainly constitute by step-down filter rectifier and the mu balanced circuit that is connected with the step-down filter rectifier and switch regulating circuit; Said mu balanced circuit and switch regulating circuit are connected with central processing system simultaneously; Said central processing system is connected with the luminous environment testing circuit, and said switch regulating circuit also is connected with LED ranks driving circuit, LED display in turn; Said switch regulating circuit and central processing system directly are provided with pwm circuit;
Said switch regulating circuit comprises the triode D1 that is connected in pwm circuit; 1 pin of said triode D1 is connected with pwm circuit, and 3 pins of triode D1 are connected with triode D2 and are connected the 2 pin ground connection of said triode D1 with 1 pin of triode D2; Said 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 said triode D2 is connected with the V0 end; 3 pins of said triode D2 are connected with rectifier IRF 19540N; And be connected with 1 pin of rectifier IRF 19540N; 2 pins of said rectifier IRF 19540N are connected with 2 pins of triode D2, and 3 pins of rectifier IRF 19540N are connected with vdd terminal, and said vdd terminal is connected with 2 pins of triode D1; And 2 pins of said triode D1 also are connected with the capacitor C 1 and capacitor C 2 of mutual parallel connection, and said capacitor C 1 also is connected with 3 pins of rectifier IRF 19540N with capacitor C 2.
Said central processing system is the MSP430F169 SCM system.
Said MSP430F169 SCM system also is connected with the RS485 communication interface circuit; Said RS485 communication interface circuit also is connected with mu balanced circuit.
Said RS485 communication interface circuit also is connected with upper PC and connects.
The MSP430F169 SCM system comprises the MSP430F169 chip, and the Dvcc of said MSP430F169 chip is connected with mu balanced circuit with the AVcc pin.
The P4.1/TB1 pin of said MSP430F169 chip is connected with the PWM plate, and said PWM plate is connected with the switch regulating circuit again.
Said LED ranks driving circuit is monochromatic anode led drive circuit altogether.
The design adopts row to send data, and the mode of line scanning realizes LED display text or image.This method combines with hardware circuit, reaches display screen overall brightness purpose relatively uniformly.
The luminous environment testing circuit utilizes the sensitivity characteristic of photoresistance to surround lighting; Gather the changing condition of surround lighting; Convert thereof into electric signal and be sent in the single-chip microcomputer MSP430F169 chip; Carry out signal Processing by single-chip microcomputer MSP430F169 chip, and export the dutycycle of PWM ripple according to certain rules control.
Between single-chip microcomputer MSP430F169 chip and LED display screen, add a switch regulating circuit, realize of the brightness adjustment of single-chip microcomputer MSP430F169 chip display screen.Adjusted PWM ripple is controlled the switch regulating circuit, thereby the size of regulating the input voltage of display screen finally realizes the brilliance control of display screen.
As shown in Figure 3; Switch regulating circuit: utilize two NPN transistor npn npns to form see-saw circuit and ripple is amplified to realize the PMOS switching tube; ON time with PWM ripple adjustment PMOS switching tube is controlled the size that VDD acts on the average voltage of display screen, and then the brightness of control LED.
For the fluctuation that prevents network voltage impacts display screen, so form the dividing potential drop metering circuit, voltage is accurately measured control with fixed value resistance R4 and R5, be used to realize the reliable and stable of screen voltage,
The design's introduction be the ambient light adaptive LED display screen that utilizes MSP430F169 SCM system control; This screen can be according to the strong and weak brightness of adjustment automatically of surround lighting; With avoid showing daytime unclear or night because of too bright and dazzling, and communicate with upper PC.LED display applications field is extensive, like large-scale places such as market, public place of entertainment, factory, schools, its research is had practical value and bright development prospect.
As stated, then can well realize the utility model.
Claims (7)
1. the control system of adaptive LED display screen; It is characterized in that: mainly constitute by step-down filter rectifier and the mu balanced circuit that is connected with the step-down filter rectifier and switch regulating circuit; Said mu balanced circuit and switch regulating circuit are connected with central processing system simultaneously; Said central processing system is connected with the luminous environment testing circuit, and said switch regulating circuit also is connected with LED ranks driving circuit, LED display in turn; Said switch regulating circuit and central processing system directly are provided with pwm circuit;
Said switch regulating circuit comprises the triode D1 that is connected in pwm circuit; 1 pin of said triode D1 is connected with pwm circuit, and 3 pins of triode D1 are connected with triode D2 and are connected the 2 pin ground connection of said triode D1 with 1 pin of triode D2; Said 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 said triode D2 is connected with the V0 end; 3 pins of said triode D2 are connected with rectifier IRF 19540N; And be connected with 1 pin of rectifier IRF 19540N; 2 pins of said rectifier IRF 19540N are connected with 2 pins of triode D2, and 3 pins of rectifier IRF 19540N are connected with vdd terminal, and said vdd terminal is connected with 2 pins of triode D1; And 2 pins of said triode D1 also are connected with the capacitor C 1 and capacitor C 2 of mutual parallel connection, and said capacitor C 1 also is connected with 3 pins of rectifier IRF 19540N with capacitor C 2.
2. the control system of adaptive LED display screen according to claim 1 is characterized in that: said central processing system is the MSP430F169 SCM system.
3. the control system of adaptive LED display screen according to claim 2 is characterized in that: said MSP430F169 SCM system also is connected with the RS485 communication interface circuit; Said RS485 communication interface circuit also is connected with mu balanced circuit.
4. the control system of adaptive LED display screen according to claim 3 is characterized in that: said RS485 communication interface circuit also is connected with upper PC and connects.
5. the control system of adaptive LED display screen according to claim 2 is characterized in that: the MSP430F169 SCM system comprises the MSP430F169 chip, and the Dvcc of said MSP430F169 chip is connected with mu balanced circuit with the AVcc pin.
6. the control system of adaptive LED display screen according to claim 5 is characterized in that: the P4.1/TB1 pin of said MSP430F169 chip is connected with the PWM plate, and said PWM plate is connected with the switch regulating circuit again.
7. according to the control system of any described adaptive LED display screen among the claim 1-6, it is characterized in that: said LED ranks driving circuit is monochromatic anode led drive circuit altogether.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202114075U CN202563870U (en) | 2012-05-11 | 2012-05-11 | Self-adaptive control system of LED display screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202114075U CN202563870U (en) | 2012-05-11 | 2012-05-11 | Self-adaptive control system of LED display screen |
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| Publication Number | Publication Date |
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| CN202563870U true CN202563870U (en) | 2012-11-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012202114075U Expired - Fee Related CN202563870U (en) | 2012-05-11 | 2012-05-11 | Self-adaptive control system of LED display screen |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103390382A (en) * | 2012-05-11 | 2013-11-13 | 四川优的科技有限公司 | Control system of self-adaptation LED display screen |
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2012
- 2012-05-11 CN CN2012202114075U patent/CN202563870U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103390382A (en) * | 2012-05-11 | 2013-11-13 | 四川优的科技有限公司 | Control system of self-adaptation LED display screen |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121128 Termination date: 20130511 |