Resolution of long life LED display screen video wall

In the field of advertising, LED display is a relatively expensive electronic product, often hundreds of thousands, some even hundreds, tens of millions. So, how to ensure the service life of such a huge investment equipment, and whether it can maintain good display effect and low failure rate in the service life have become a topic of great concern for manufacturers and investors. Next, from the perspective of technology, to analyze the factors that affect the life of the LED display, to explore measures to ensure the longevity of the LED display.
1. Factors affecting the life of LED display
The factors that affect the life of LED display screen are classified according to internal and external factors. The internal factors include the performance of LED light-emitting devices, the performance of peripheral components and the anti fatigue performance of products; The external factors include the working environment of LED display.
1.1 influence of LED light emitting device performance
LED light-emitting device is the most critical and life-span related component of display screen. For LED, we focus on the following indicators: attenuation characteristics, water vapor permeability characteristics, UV resistance.
Brightness attenuation is an inherent characteristic of LED. For a display with a design life of 5 years, if the brightness attenuation of LED is 50% in 5 years, the attenuation margin should be reserved in the design, otherwise the display performance will not meet the standard after 5 years; The stability of the attenuation index is also very important. If the attenuation exceeds 50% in three years, it means that the life of this screen will end ahead of time.
The display screen used outdoors is often eroded by moisture in the air. When the LED chip is exposed to water vapor, it will cause stress change or electrochemical reaction, resulting in device failure. Under normal circumstances, LED light-emitting chips are wrapped by epoxy resin and are not eroded. Some LED devices with design defects or material and process defects have poor sealing performance. Water vapor easily enters into the device through the pin gap or the gap between the epoxy resin and the shell, resulting in the rapid failure of the device, which is called “dead light” in the industry.
Under the irradiation of ultraviolet, the properties of LED colloid and support materials will change, which will lead to device cracking and affect the life of LED. Therefore, UV resistance of outdoor LED is also one of the important indicators.
The performance improvement of LED devices needs process and market test.