LED electronic screen advertising media also has the characteristics of high effective arrival rate, and compared with TV, newspapers and other media formats, LED display price is relatively low. This unique value makes full-color LED advertising screen media become a new cost of outdoor media. Different from the traditional outdoor media, the full-color LED electronic screen is not only an outdoor media, but also has the characteristics and advantages of television and other media. It can meet the personalized requirements through larger creative space and larger three-dimensional space (for consumers’ space-time interaction and communication). It is a unique screen form with the concept of communication in the digital era.
We often encounter this problem in the application of LED display screen. The LED electronic screen works normally in the start-up stage of the product, but if the light is turned on for a certain period of time, there will be dark light, flashing, fault, intermittent bright and other phenomena, causing serious damage to the product. The reasons for this phenomenon are as follows.
1. In the application of products, if there are problems in the welding process, such as too high welding temperature, welding time, incorrect implementation of anti-static operation, etc., more than 95% of these problems are caused by the packaging process.
2. Due to the quality of LED itself or production process.
Prevention methods
1. Welding process control.
2. Aging test of products
Aging is an important guarantee for the reliability of electronic products, and it is the last necessary step of product production. LED products can improve the performance after aging and help to stabilize the performance after use. Aging test of LED electronic screen is an important part of product quality control, but it is often ignored, so it is unable to carry out accurate and effective aging. Led aging test is based on the failure rate curve of the product and the characteristics of the bathtub curve, aiming at improving the reliability of the product, but this method is not necessary. Finally, aging tests sacrifice the life of a single LED product.
Led aging methods include constant current aging and static pressure aging. A constant current source means that the current is constant at all times. There is a frequency problem. It’s not constant current. That’s alternating current or pulsating current. AC or pulsating current sources can be designed to have constant RMS, but these sources cannot be called constant current sources. Constant current aging is the characteristic of LED current operation, which is a scientific led aging method; over current impact aging is also a new aging method adopted by LED electronic screen manufacturers. By adjusting the frequency and constant current source of current, the quality expectation of LED can be determined in a short time, and many hidden dangerous LEDs that can not be covered by existing aging can be selected.