LED display advertising media has the characteristics of high effective arrival rate at the same time. Compared with TV, newspaper and other media delivery forms, LED display prices are relatively low. These unique values make the full color LED advertising screen media naturally become the outdoor media upstart. Unlike traditional outdoor media, full-color LED display is not just pure outdoor media, its properties and advantages of both TV and other media at the same time, have more creative space time interaction and communication with consumers and the wider stereo space, can meet the personalized needs, with the spread of digital era concept, is a unique form of the screen.
Such a problem often occurs when we apply LED screens. LED screens work normally at the beginning, but after being lit for a period of time, there will be dark light, flashing, fault, intermittent brightness and other phenomena, which will bring serious damage to the products. According to the powerful color small make up query that causes this phenomenon is generally:
1. When applying the product, there are problems in the welding process, such as too high welding temperature, too long welding time, and failure in anti-static work, etc., which are more than 95% caused by packaging process.
2. LED quality or production process.
The prevention methods
1. Control the welding process.
2. Aging test of the product
Aging is an important guarantee for the reliability of electronic products and an indispensable step in product production. LED products can improve the efficiency after aging, and contribute to the stability of the efficiency of later use. LED display aging test is a very important link in product quality control, but it is often ignored in many times, unable to carry out the correct and effective aging. The LED aging test is based on the characteristics of the failure rate curve of the product, namely the bathtub curve, so as to improve the reliability of the product, but this method is not necessary, after all, the aging test is at the cost of sacrificing the life of a single LED product.
LED aging includes constant current aging and constant pressure aging. A constant current source is one in which the current is constant at all times. There's a frequency problem, not a constant current. That is alternating current or pulsating current. An ac or pulsating current source may be designed to have a constant effective value, but it cannot be called a constant current source. Constant current aging is the working characteristic of LED current and a scientific LED aging method. Overcurrent shock aging is also a new aging method adopted by LED display manufacturers. The constant current source with adjustable frequency and adjustable current can be used for such aging, so as to judge the quality life expectancy of LED in a short time, and to pick out many hidden LED problems that cannot be picked out by conventional ag