The Principal Cause Of Malfunction LED On LED Displays

The Principal Cause Of Malfunction LED On LED Displays

Theoretically the MTBF (Mean time between failures) of good quality LED displays should be 5000 hours. But if the manufacturers adopt low quality material, the practical performance would be further shorter than it. Moreover, the problem would occur very frequently.

The malfunction usually happens on the LEDs, Driver IC, Power supplies, PCB, Connectors, but among all the components, the worst situation is the malfunction happens on the LEDs because it's just the light emitting component to show the image and videos. If it's a common problem of one bulk leds for the led display, there would be no way to fix the led screen.

The principal causes of malfuntion LED are:

1. The Bad LED Quality
2. The Incorrect Usage

Firstly about the bad quality LED, there's only one way for the led display manufacturers - that is to choose the good quality LED vendors. But if one manufacturer always keeps the thought of "lower and lower cost", we think it would be very dangerous, here we will not discuss further.

Sencondly about the Incorrect Usage. There are many hidden problem couldn't be inspected out. But once the LED face the statics, big current shock, the reinforce, the problem would appear. As well, bad quality LEDs performs worse in the LED chips, epoxide resins, leadframes, internal leads, Die-Attached Epoxys, PPA etc.

The different thermal expansion coefficient will easily break the bad quality LEDs.

To the GaN LEDs, the static electricity is the principal cause of the malfunction. The whole process of this malfunction is very complex. The equipments, the wares, the operators' human body, anything could have the possible statics. The static has hundreds, thousands Volt, and the time of discharge is calculated with nanosecond.

Sometimes the manufacturers find the malfunction of blue and green LEDs, that's usually caused by the statics, and the LED-PN is destroyed completely by the electrostatic discharge.

To avoid this, the most important thing is to choose good quality LEDs; as well, during all the production processes, the electrostatic protection should be executed.

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