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Sep 22, 2023, 9:01:35 AM
Nowadays, more and more companies use LED display screen for outdoor advertising. However, after half a year or a year, some display screens will have problems such as blurred screen and color distortion. If not handled in time, it will cause chain reaction and lead to more problems. Sostron summarizes four factors that affect the life of LED display.
4 factors affecting the service life of LED display
LED light emitting devices are the most critical and life-related components of the display screen. For LED, we pay attention to the following indicators: attenuation characteristics, water vapor permeability characteristics, and UV resistance.
Luminance attenuation is an inherent characteristic of LED. For a display screen with a design life of 5 years, if the brightness attenuation of the LED used is 50% in 5 years, the attenuation margin should be considered in the design, otherwise the display performance cannot meet the standard after 5 years; The stability of the attenuation index is also very important. If the attenuation has exceeded 50% in 3 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. The LED light-emitting chip will cause stress change or electrochemical reaction to cause device failure when it is exposed to water vapor. Under normal circumstances, LED light-emitting chips are wrapped by epoxy resin and are not corroded. Some LED devices with design defects or material and process defects have poor sealing performance, and water vapor easily enters the device through the pin gap or the gap between the epoxy resin and the shell interface, resulting in rapid device failure, which is called "dead light" in the industry.
Under the irradiation of ultraviolet light, the properties of LED colloid and support material will change, which will lead to device cracking and affect the life of LED. Therefore, the ultraviolet resistance of LED used outdoors is also one of the important indicators.
The performance improvement of LED devices needs process and market inspection. At present, Japan and some Taiwan-funded enterprises are very cautious and do not promise SMD outdoor waterproofing. However, some domestic manufacturers are eager to launch new products to occupy the market, and blindly promise excellent outdoor performance without passing the evaluation. In the application of the SMD5050 for outdoor use, many manufacturers have had a lot of quality accidents, some of which have lost tens of millions of yuan, which is shocking.
In addition to LED light emitting devices, the display screen also uses many other peripheral components, including circuit boards, plastic shells, switching power supplies, connectors, chassis, and so on. The life of the display screen may be reduced if any component fails. Therefore, it is no exaggeration to say that the longest life of the display screen is determined by the life of the key component with the shortest life. For example, LED, switching power supply and metal shell are selected according to the 8-year standard, while the protective process performance of the circuit board can only support its work for 2 years. After 2 years, it will be damaged due to corrosion, so we can only get a 2-year display.
The anti-fatigue performance of display products depends on the production process. It is difficult to guarantee the anti-fatigue performance of the module made by the poor three-proofing treatment process. When the temperature and humidity change, the protective surface of the circuit board will crack, leading to the decline of the protective performance.
Therefore, the production process is also the key factor to determine the life of the display screen. The production processes involved in the production of display screen include: storage and pretreatment of components, furnace welding process, three-prevention treatment process, waterproof sealing process, etc. The effectiveness of the process is related to the selection and proportion of materials, 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.
Due to different purposes, the working conditions of the display screen vary greatly. In terms of environment, the indoor temperature difference is small, and there is no rain, snow and ultraviolet influence; The outdoor temperature difference can reach up to 70 degrees, plus wind, sun and rain. Bad environment will aggravate the aging of the display screen, and the working environment is an important factor affecting the life of the display screen.
LED display screen is a relatively expensive electronic product. If it is not carefully maintained on weekdays, its service life will be greatly reduced, and various problems will often occur, which not only affects the use, but also costs a lot of money. So the editor reminds everyone to pay attention to the maintenance and maintenance of LED display screen on weekdays.