Publisher: Supplier of LED Display Time: 2018-07-17 Views: 2590
We often encounter such problems when applying LED displays. The LED display works normally when it is first used on the product, but after a period of lighting, there will be dim light, flickering, failure, intermittent lighting, etc. , causing serious damage to the product. The reasons for this phenomenon are roughly as follows:
1. When applying the product, there are problems in the welding process, such as too high welding temperature, too long welding time, and lack of anti-static work. More than 95% of these problems are caused by the packaging process.
2. The quality of the LED itself or the production process.
Prevention methods are:
1. Do a good job in the control of the welding process.
2. Carry out aging test on products: Aging is an important guarantee for the reliability of electronic products and the last essential step in product production. LED products can improve performance after aging, and help stabilize the performance in later use. LED display aging test is a very important link in product quality control, but it is often ignored in many cases, and it is impossible to perform correct and effective aging. LED aging test is a countermeasure taken according to the characteristics of the product's failure rate curve, that is, the bathtub curve, in order to improve the reliability of the product, but this method is not necessary, after all, the aging test is to sacrifice the life of a single LED product for the price.
LED aging methods include constant current aging and constant voltage aging. A constant current source means that the current is constant at any time. If there is a frequency problem, it is not a constant current. That's AC or pulsating current. The AC or pulsating current source can be designed to have a constant RMS value, but this kind of power source cannot be called a constant current source. Constant current aging is the most scientific LED aging method in line with the working characteristics of LED current; overcurrent impact aging is also a new aging method adopted by LED display manufacturers. Such aging is expected to judge the quality and life expectancy of LEDs in a short time, and can pick out many hidden LEDs that cannot be picked out by conventional aging.