LED display advertising media also has an advertising feature with high effective arrival rate. Compared with TV, newspaper and other media delivery forms, LED display prices are relatively low. These values ​​make full-color LED advertising screen media a natural newcomer to outdoor media. Unlike traditional outdoor media, full-color LED display is not just pure outdoor media. It also has the characteristics and advantages of media such as TV. It has more creative space and a more space for interaction and communication with consumers. Meeting the individual needs, with the concept of communication in the digital age, is a special form of screen.
We often have such problems when applying LED display. The LED display works normally at the beginning of the product, but after a period of lighting, there will be dark light, flashing, fault, intermittent light, etc. , causing serious damage to the product. The reasons for this phenomenon are:
First, when applying the product, there are problems with 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.
Second, the quality of the LED itself or the manufacturing process. The prevention methods are:
1. Do a good job in welding process control.
2, aging test of products: aging is an important guarantee for the reliability of electronic products, 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 display 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 in line with the LED current working characteristics, and is a scientific LED aging method; overcurrent aging is also an aging method newly adopted by LED display manufacturers, which is carried out by using a constant current source with adjustable frequency and current adjustable. 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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