How to choose between indoor and outdoor LED full-color display screen
How to choose between indoor and outdoor LED full-color display screen
The most critical component of the full color LED display is the LED device. There are three reasons: first, the LED is the full-color screen in the whole machine using the largest number of key devices, each square meter will use thousands to tens of thousands of LED; second, the LED is the main body to determine the performance of the whole screen optical display, which directly affects the audience on the evaluation of the display; third, the LED in the overall cost of the display accounted for the largest proportion of the overall cost of the display, ranging from 30% to 70%.
LED is the most critical device of full-color LED display, equivalent to the CPU of a computer, the choice of LED has decided the quality of the whole display more than 50%. If you fail to choose a good LED, the other parts of the display are no longer good enough to make up for the defects in the quality of the display.
Full-color LED display LED quality and parameters can be attributed to the following five elements
The use of full-color display special LED
The quality of the LED also needs a good use of methods and environment, summarized in the following eight major points of use:
The above is from the point of view of the selection and use of full-color display screen.
Special LED knowledge, full color LED display is a system integration of products, LED packaging manufacturers and display application manufacturers need to work closely with, strengthen technical exchanges. China has now become the manufacturing center of led display all over the world, and is approaching the led display manufacturing powerhouse. Contains indoor and outdoor all full color screen. Indoor LED full-color display main models are: P1.904, P2.5, P3, P3.91, P4,,P4.81, P5, P6, P8, P10; outdoor external LED full-color display main models are: P4, P5, P6, P8, P10; outdoor direct insertion LED full-color large screen: P8, P10, P16;
Full-color LED display product range, product application diversification, which: LED display series covers indoor and outdoor, including: 1, stage products; 2, billboards; 3, highway signs; 4, rental screen; 5, stadium screen; widely used in a variety of public places, such as, wedding companies, hotels, media, commercial plazas, government agencies, sports stadiums, transportation facilities, financial institutions, etc. where , occupies a leading position in the LED industry.
Switch LED electronic display screen precautions:
1, switching order: open screen: the first boot, then open the screen. Close the screen: first off the screen, after the shutdown (first off the computer does not turn off the display, will cause the screen body appears high brightness, led burned lamp, the consequences are serious.)
2, switch screen interval should be greater than 5 minutes.
3, the computer into the project control software before the screen can be opened and energized.
4, avoid opening the screen in the all-white screen state, because at this time the system has the largest impact current.
5, to avoid opening the screen in the uncontrolled state, because the system at this time the largest impact current. a, the computer does not enter the control software and other programs; b, the computer is not powered on; c, the control part of the power supply is not turned on.
6, the ambient temperature is too high or heat dissipation conditions are not good, led lighting should be careful not to open the screen for a long time.
7, electronic display body part of a line appears very bright, should pay attention to timely turn off the screen, in this state should not be a long time to open the screen.
8, often the power switch of the display screen tripped, you should promptly check the screen or replace the power switch.
9, regularly check the firmness of the hanging joints. If the phenomenon of loosening, pay attention to timely adjustment, re-enforcement or update the hanging parts.
10, according to the large screen display screen, the control part of the environment, to avoid insect bites, if necessary, should be placed to prevent rodenticide.
Control part of the change, change notes
1, computer, control part of the power cord zero, fire can not be reversed, should be strictly in accordance with the original location of the plug. If there is a peripheral, after connecting, should test whether the chassis is electrified.
2, move the computer and other control equipment, power should first be checked before connecting the line, the control board has no loose phenomenon.
3, can not change the position and length of the communication line, flat connecting line.
4, after moving, such as short-circuit, tripping, burn line, smoke and other abnormalities, should not be repeatedly energized test, should be timely to find the problem.
Software operation precautions
1, software backup: WIN2003, WINXP, applications, software installers, databases, etc., it is recommended to use the “One Key Restore” software, easy to operate.
2, proficiency in the installation method, the original data recovery, backup.
3、Master the setting of control parameters, basic data preset modifications
4, skilled use of programs, operations and editing.
5、Regular inspection, delete irrelevant data.
6, non-specialized personnel, please do not operate the software system.
LED is the most critical device of full-color LED display, equivalent to the CPU of a computer, the choice of LED has decided the quality of the whole display more than 50%. If you fail to choose a good LED, the other parts of the display are no longer good enough to make up for the defects in the quality of the display.
Full-color LED display LED quality and parameters can be attributed to the following five elements
- 1, failure rate
As the full-color display by tens of thousands or even hundreds of thousands of groups of red, green, blue LED pixels composed of three kinds of points, the failure of any color LED will affect the overall visual effect of the display. Generally speaking, according to industry experience, in the led display screen assembly to aging 72 hours before shipment of the failure rate should not be higher than three ten thousandths (refers to the LED device itself caused by the failure).
- 2, anti-static ability
LED is a semiconductor device, sensitive to static electricity, very easy to cause electrostatic failure, so the anti-static ability is crucial to the life of the display. Generally speaking, the LED human body electrostatic mode test failure voltage should not be less than 2000V.
- 3, attenuation characteristics
Red, green, blue LED have with the increase of working time and brightness decay characteristics, LED chip of good and bad, good and bad auxiliary materials and encapsulation process level determines the decay rate of LED. Generally speaking, 1000 hours, 20 mA room temperature light test, red LED attenuation should be less than 10%, blue, green LED attenuation should be less than 15%. Red, green, blue attenuation of the consistency of full-color LED display later white balance has a great impact, which in turn affects the display fidelity of the display.
- 4, brightness
LED brightness is an important determinant of the brightness of the display. the higher the LED brightness, the greater the margin of the use of current, to save power consumption, to maintain the stability of the LED has the advantage of a different angle value, in the case of the chip brightness has been determined, the smaller the angle, the brighter the LED, but the display of the viewing angle is smaller. Generally should choose 100 degrees of LED to ensure that the display sufficient viewing angle. For different point spacing and different viewing distance of the display, should be in the brightness, angle and price to find a balance.
- 5, consistency
Full-color display is composed of countless red, green, blue LED pixels spelled out, the brightness of each color LED, wavelength consistency determines the brightness of the entire display consistency, white balance consistency, chromaticity consistency. Generally speaking, display manufacturers require device suppliers to provide 5nm wavelength range and 1:1.3 brightness range of the LED, these indicators can be graded by the device supplier through the spectrophotometric color separation machine to achieve. Voltage consistency is generally not required.
The use of full-color display special LED
The quality of the LED also needs a good use of methods and environment, summarized in the following eight major points of use:
- 1, anti-static
Display assembly plant should have good anti-static measures. Special anti-static ground, anti-static floor, anti-static iron, anti-static pad, anti-static ring, anti-static clothing, humidity control, equipment grounding (especially the foot cutter), etc. are the basic requirements, and to use static electricity meter for regular testing.
- 2, over the wave soldering
Temperature and time shall be strictly controlled wave soldering temperature and time over the furnace, it is recommended that: preheating temperature of 100 ℃ ± 5 ℃, the highest not more than 120 ℃, and preheating temperature rise requires a smooth, welding temperature of 245 ℃ ± 5 ℃, welding time is recommended to be no more than 3 seconds, over the furnace, do not vibrate or impact LED until the return to ambient temperature state. Wave soldering machine temperature parameters to be tested regularly, which is determined by the characteristics of the LED, overheating or fluctuating temperatures will directly damage the LED or cause LED quality hazards, especially for small sizes such as 3mm round and oval LED.
- 3, design current value
LED's nominal current is 20mA, generally recommended that its maximum current is not more than 80% of the nominal value, especially for the point spacing is very small display, due to poor heat dissipation conditions, should also reduce the current value. According to experience, due to the inconsistency of red, green and blue LED attenuation rate, targeted to reduce the current value of blue and green LEDs, in order to maintain the consistency of the white balance of the display after a long period of use.
- 4, mixed lights
The same color with different brightness levels of the LED needs to be mixed, or in accordance with the discrete law designed to insert the light map to ensure that the whole screen the consistency of the brightness of each color. This process if there is a problem, there will be a display of local brightness inconsistent phenomenon, directly affecting the led display effect.
- 5, control the verticality of the light
For direct insertion LED, over the furnace to have enough technology to ensure that the LED is perpendicular to the PCB board. Any deviation will affect the consistency of the brightness of the LED has been set up, the appearance of inconsistent brightness of the color block.
- 6, thermal design
LED work will heat up, high temperature will affect the LED decay rate and stability, so the thermal design of the PCB board, the case of the ventilation and thermal design will affect the performance of the LED.
- 7, soldering control
LED display in the LED does not light up, there is often more than 50% probability for various types of soldering caused by virtual welding, such as LED pin soldering, IC pin soldering, row of pins and rows of mother soldering and so on. The improvement of these problems need to strictly improve the process and strengthen the quality inspection to solve. Vibration test before leaving the factory is not a good way to check.
- 8, drive circuit design
Display module on the driver circuit board driver IC layout will also affect the brightness of the LED. As the driver IC output current in the PCB board transmission distance is too far, will make the transmission path voltage drop is too large, affecting the normal operating voltage of the LED resulting in a reduction in its brightness. We often find that the LED brightness around the display module is lower than in the center, this is the reason. Therefore, to ensure the consistency of the brightness of the display, we must design a good drive circuit distribution diagram.
The above is from the point of view of the selection and use of full-color display screen.
Special LED knowledge, full color LED display is a system integration of products, LED packaging manufacturers and display application manufacturers need to work closely with, strengthen technical exchanges. China has now become the manufacturing center of led display all over the world, and is approaching the led display manufacturing powerhouse. Contains indoor and outdoor all full color screen. Indoor LED full-color display main models are: P1.904, P2.5, P3, P3.91, P4,,P4.81, P5, P6, P8, P10; outdoor external LED full-color display main models are: P4, P5, P6, P8, P10; outdoor direct insertion LED full-color large screen: P8, P10, P16;
Full-color LED display product range, product application diversification, which: LED display series covers indoor and outdoor, including: 1, stage products; 2, billboards; 3, highway signs; 4, rental screen; 5, stadium screen; widely used in a variety of public places, such as, wedding companies, hotels, media, commercial plazas, government agencies, sports stadiums, transportation facilities, financial institutions, etc. where , occupies a leading position in the LED industry.
Switch LED electronic display screen precautions:
1, switching order: open screen: the first boot, then open the screen. Close the screen: first off the screen, after the shutdown (first off the computer does not turn off the display, will cause the screen body appears high brightness, led burned lamp, the consequences are serious.)
2, switch screen interval should be greater than 5 minutes.
3, the computer into the project control software before the screen can be opened and energized.
4, avoid opening the screen in the all-white screen state, because at this time the system has the largest impact current.
5, to avoid opening the screen in the uncontrolled state, because the system at this time the largest impact current. a, the computer does not enter the control software and other programs; b, the computer is not powered on; c, the control part of the power supply is not turned on.
6, the ambient temperature is too high or heat dissipation conditions are not good, led lighting should be careful not to open the screen for a long time.
7, electronic display body part of a line appears very bright, should pay attention to timely turn off the screen, in this state should not be a long time to open the screen.
8, often the power switch of the display screen tripped, you should promptly check the screen or replace the power switch.
9, regularly check the firmness of the hanging joints. If the phenomenon of loosening, pay attention to timely adjustment, re-enforcement or update the hanging parts.
10, according to the large screen display screen, the control part of the environment, to avoid insect bites, if necessary, should be placed to prevent rodenticide.
Control part of the change, change notes
1, computer, control part of the power cord zero, fire can not be reversed, should be strictly in accordance with the original location of the plug. If there is a peripheral, after connecting, should test whether the chassis is electrified.
2, move the computer and other control equipment, power should first be checked before connecting the line, the control board has no loose phenomenon.
3, can not change the position and length of the communication line, flat connecting line.
4, after moving, such as short-circuit, tripping, burn line, smoke and other abnormalities, should not be repeatedly energized test, should be timely to find the problem.
Software operation precautions
1, software backup: WIN2003, WINXP, applications, software installers, databases, etc., it is recommended to use the “One Key Restore” software, easy to operate.
2, proficiency in the installation method, the original data recovery, backup.
3、Master the setting of control parameters, basic data preset modifications
4, skilled use of programs, operations and editing.
5、Regular inspection, delete irrelevant data.
6, non-specialized personnel, please do not operate the software system.