Efficient application of LED display screen "anti-aging"
Date：2018-07-25
Guide: We often have such problems when applying LEDs. The LED display works normally at the beginning of the product, but after a period of lighting, it will appear dark, flashing, faulty, intermittent, etc. , causing serious damage to the product.
We often have such problems when applying LEDs. The LED display works normally at the beginning of the product, but after a certain period of time, it will appear dark, flashing, faulty, intermittently bright, etc. The product causes serious damage. The reasons for this phenomenon are roughly the following.
1. When applying the product, there are problems in the welding process. For example, the welding temperature is too high, the welding time is too long, and the antistatic work is not done. More than 95% of these problems are caused by the packaging process.
2. The quality of the LED itself or the manufacturing process.
Prevention method
1. Do a good job in controlling the welding process.
2. The product is tested for aging.
Aging is an important guarantee for the reliability of electronic products and is the last essential step in the production of products. LED products can improve performance after aging and contribute to stable performance in later use. LED advertising screen aging test is a very important part of product quality control, but it is often overlooked and cannot be properly and effectively aged. The LED aging test is based on the failure rate curve of the product, that is, the characteristics of the bathtub curve, 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 pressure aging. A constant current source means that the current is constant at all times. If there is a frequency problem, it is not a constant current. That is AC or pulsating current. The AC or pulsating current source can be designed to have a constant rms value, but this power source cannot be called a constant current source. Constant current aging is the most suitable LED current working characteristic, and it is the most scientific LED aging method. Overcurrent aging is also the latest aging method adopted by LED display manufacturers. It is used by constant current source with adjustable frequency and current adjustable. Such aging, in order to judge the quality life expectancy of LED in a short time, and can pick out many hidden LEDs that can not be picked out by conventional aging.
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