LED display Anti-aging
he LED advertising screen media also has the advertising characteristics of high effective arrival rate. Compared with the media such as TV and newspapers, the price of the LED display screen is relatively low. These unique values make full-color LED advertising screen media become a natural upstart in outdoor media. Different from traditional outdoor media, full-color LED advertising screen is not just a simple outdoor media, it also has the characteristics and advantages of TV and other media, has a larger creative space and a wider three-dimensional space for interaction and communication with consumers. To meet individual needs, with the concept of communication in the digital age, it is a unique screen form.
We often encounter such problems when applying LEDs. The LED display works normally at the beginning of the product, but after lighting for a period of time, there will be dim light, flickering, failure, intermittent lighting and other phenomena. 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 the welding temperature is too high, the welding time is too long, and the anti-static work is not done well. More than 95% of these problems are caused by the packaging process.
2. It is caused by 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 an aging test on the product.
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 advertising screen aging test is a very important link in product quality control, but it is often ignored in many cases, and it is impossible to carry out correct and effective aging. LED aging test is a countermeasure taken according to the product’s failure rate curve, that is, the characteristics of 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.
