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November 27, 2018

What causes the aging of full-color LED screen?


What is the meaning of aging test for full-color Led screen? When we use full-color LED screen, we often encounter such problems. The full-color LED screen works normally at the beginning of the product, but after a period of lighting, there will be dark light, flashing, failure, intermittent lighting and other phenomena, which will cause serious damage to the product. The cause of this phenomenon:

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What is themeaning of aging test for full-color LED screen? When we use full-color LED screen, we often encounter such problems. The full-color LED screen works normally at the beginning of the product, but after a period of lighting, there will be dark light, flashing, failure, intermittent lighting and other phenomena, which will cause serious damage to the product. The reasons for this phenomenon are as follows:
1. In the application of products, there are some problems in the welding process, such as too high welding temperature, too long welding time, and no anti-static work. More than 95% of these problems are caused by the packaging process.
2. The quality of full-color LED screen itself or the production process.
Preventive measures are:
1. Control the welding process well.
2. Aging testing of products: Aging is an important guarantee for the reliability of electronic products and the last essential step in the production of products. LED products can improve the efficiency after aging, and help to stabilize the efficiency of later use. The aging test of full-color screen is a very important link in product quality control, but it is often neglected in many cases and can not carry out the correct and effective aging. LED aging test is based on the characteristics of the product failure rate curve, that is, the bathtub curve, to improve the reliability of the product, but this method is not necessary, after all, aging test is at the expense of the life of a single LED product.
The aging methods of full-color LED screen include constant current aging and constant pressure aging. Constant current source means that the current is constant at any time. The problem of frequency is not constant current. That's AC or pulsating current. AC or pulsating current sources can be designed with constant RMS, but they can not be called constant current sources. Constant current aging is the most scientific way to aging LED, which is in line with the working characteristics of LED current. Overcurrent shock aging is also the latest aging method adopted by the manufacturers of full-color LED screens. This kind of aging is carried out by using constant current source with adjustable frequency and current, in order to judge the quality life expectancy of LED in a short time and select the right one. Many hidden dangers of conventional aging can not be picked out by full-color LED screen.
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