Eight Steps to Control LED Display Working Time Published:2017-03-08

Like other products, there are many problems and the do’s and don’ts during LED display operation. When using LED display, the following 8 factors which may cause problems or prolong working life should be noticed. 

1.Heat dissipation design

The heat generated during led working time will affect the degradation coefficient and stability. Thus the heat dissipation design of PCB board and cabinet is quite important.

2.Mixed light

The same color with different brightness level LED should be mixed together or line according to discrete layout drawing to ensure the brightness uniformity of whole display. The problems of this process will cause the brightness inconformity and thus affect the effect.

3.Current Value

We suggest that the max operating current should be less than 80% of LED nominal current 20mA, especially for small pixel pitch display which is poor at heat dissipation. Due to the inconsistency of degradation coefficient between RGB LEDs, it is vital to reducing the current value of green and blue LEDs to maintain the consistency of white balance after long time using.

4.The design of driving circuit

The driving IC configuration in the driving circuit board of the display would also influence LED brightness. If the transmission distance of output current in the PCB board is too long, the pressure drop will increase and thus reduce the brightness. That’s the reason why display central modules are brighter than surrounding modules. To ensure the whole display brightness consistency, a reasonable driving circuit design is needed.

5.Lamp verticality

For DIP lamp, the mature technical skills to keep LED vertical to PCB board are necessary. Any deviation can affect the set brightness consistency.

6.Pseudo Soldering  control

Over 50% possible factor of fault LED is caused by various false welding like LED pin solder, IC pin solder and  pin header, SMT solder. To solve these problems, improve the technical skills and test the quality strictly is needed. Vibration test before delivery is also a solution.

7.Wave soldering temperature and time

The suitable preheat for wave soldering is 100℃±5℃ and less than 120℃.  Besides, the temperature should rise in even speed. For soldering, the temperature should be controlled around 245℃±5℃ and soldering at 3 seconds. Don’t vibrate or strike LED after furnace until the temperature is normal. Remember to test the crest welder temperature parameter regularly for overheat or wave temperature would damage the LED or affect it, especially for small size LED like 3mm round or oval LED.

8.Anti-static function

The factory of assembly should be equipped with anti-static precautions. Exclusive static-free ground, anti-static soldering iron, anti-static cushion, anti-static cloth, humidity control and grounded equipment especially cutting machine are all basic needs for factory. In addition, test with static monitor regularly is also necessary.