Nowadays, more and more companies are using LED screens for outdoor advertising. However, after half a year or a year, some LED screens will suffer from screen blur, color malformation and other malfunctions. If not dealt with in time, it will cause a chain reaction and lead to more problems. Below Sostron summarizes 4 factors that affect the life of LED screen.
1. LED light-emitting device performance
LED light-emitting devices are the most critical components of LED screen and are most related to lifespan. For LEDs, we focus on the following indicators: attenuation characteristics, waterproof vapor penetration characteristics, and ultraviolet resistance.
Brightness attenuation is an inherent characteristic of LEDs. For a LED screen with a design life of 5 years, if the brightness of the LED used is attenuated by 50% in 5 years, the attenuation margin must be considered during the design, otherwise the display performance will not meet the standard after 5 years; the stability of the attenuation index will also be It is very important. If the attenuation exceeds 50% in 3 years, it means that the life of this screen has ended prematurely.
LED screens used outdoors are often corroded by moisture in the air. When LED light-emitting chips come into contact with water vapor, they will cause stress changes or electrochemical reactions, leading to device failure. Under normal circumstances, LED light-emitting chips are wrapped in epoxy resin and are not corroded. Some LED devices with design defects or material and process defects have poor sealing performance, and water vapor can easily pass through the pin gap or the gap between the epoxy resin and the shell joint surface. Entering the interior of the device causes the device to rapidly fail, which is called a “dead light” in the industry.
Under the irradiation of ultraviolet rays, the properties of the LED’s colloid and bracket materials will change, causing the device to crack, thereby affecting the life of the LED. Therefore, the UV resistance of LEDs used outdoors is also one of the important indicators.
Improving the performance of LED devices requires a process and requires market testing. At present, Japanese and some Taiwan-funded companies are very cautious and do not promise SMD outdoor waterproofing. However, some domestic manufacturers are eager to launch new products to occupy the market. When the evaluation fails, they blindly promise excellent outdoor performance. In the application of SMD5050 for outdoor display screens, many manufacturers have suffered a large number of quality accidents, and some have suffered losses as high as tens of millions of yuan, which is shocking.
2. External parts
In addition to LED light-emitting devices, the display screen also uses many other peripheral components, including circuit boards, plastic casings, switching power supplies, connectors, chassis, etc. Problems with any of these components may reduce the life of the display screen. . Therefore, it is not an exaggeration to say that the longest life of the display screen is determined by the life of the shortest key component. For example, LEDs, switching power supplies, and metal casings are all selected according to the 8-year standard. However, the protective process performance of the circuit board can only support its operation for 2 years. After 2 years, it will be damaged due to rust, so we can only get a 2-year-old one. longevity of the display.
3. Product fatigue resistance
The fatigue resistance performance of LED screen products depends on the production process. The anti-fatigue performance of modules produced by poor three-proof processing technology is difficult to guarantee. When temperature and humidity change, cracks will appear on the protective surface of the circuit board, resulting in a decrease in protective performance.
Therefore, the production process is also a key factor in determining the life of LED screen. The production processes involved in display screen production include: component storage and pretreatment process, furnace welding process, three-proof treatment process, waterproof sealing process, etc. The effectiveness of the process is related to material selection and ratio, parameter control and operator quality. The accumulation of experience is very important, so a factory with many years of experience will be more effective in controlling the production process.
4. Working environment
Due to different uses, the working conditions of the display screen vary widely. From an environmental perspective, the indoor temperature difference is small and there is no influence from rain, snow and ultraviolet rays; the outdoor temperature difference can reach up to 70 degrees, plus wind, sun and rain. Harsh environments will aggravate the aging of the display, and the working environment is an important factor affecting the life of the display.
LED screen is a relatively expensive electronic product. If it is not maintained carefully, its service life will be greatly reduced, and various problems will often occur, which not only affects the use, but also costs money. It will also be very large, so everyone must pay attention to the maintenance and upkeep of LED screen in daily life.