Main Factors to Impact LED Screen Lifespan
Time:2018-01-08
Views:182
Main Factors to Impact LED Screen Lifespan
Technially, below are the factors to impact led screen lifespan:
1. LED lighting device performance
LED light-emitting devices are the most critical and long-lasting components of the display. For LEDs, we focus on the following indicators: attenuation characteristics, water vapor permeability, and UV resistance.
Brightness decay is an inherent characteristic of LEDs. For a display with a design life of 5 years, if the brightness of the LED used is 5% 50%, the design should consider the reserve margin. Otherwise, the display performance will not reach the standard after 5 years; the stability of the attenuation index is also It is very important that if the attenuation has exceeded 50% in 3 years, it means that the life of this screen is premature.
Display screens for outdoor use are often eroded by moisture in the air. LED light-emitting chips can cause stress changes or electrochemical reactions that cause device failure in the case of contact with water vapor. Under normal circumstances, the LED light-emitting chip is not eroded by the epoxy resin, and some LED devices with design defects or material process defects have poor sealing performance, and the water vapor is easily passed through the pin gap or the gap between the epoxy resin and the outer surface of the outer casing. Entering the inside of the device causes the device to fail quickly, which is called "dead light" in the industry.
Under the ultraviolet light, the properties of the colloid and the support material of the LED will change, which will cause the device to crack and affect the life of the LED. Therefore, the LED anti-UV ability for outdoor use is also an important indicator.
The performance improvement of LED devices requires a process and requires market testing. 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 introduce new products to occupy the market, and blindly promise excellent outdoor performance in the case of unrecognized evaluation. SMD5050 for outdoor use In the display application, there have been a lot of quality accidents caused by many manufacturers, and some losses are as high as tens of millions of dollars, which is shocking.
2. Peripheral component influence
In addition to LED lighting devices, the display also uses many other peripheral components, including circuit boards, plastic housings, switching power supplies, connectors, chassis, etc., any problem with one component, may lead to reduced display life . Therefore, if the longest life of the display is determined by the life of the key component of the shortest life, it is not an exaggeration. For example, LED, switching power supply, and metal casing are all selected according to the 8-year standard, and 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 rust, then we can only get a piece of 2 years. Life display.
3. Product fatigue resistance
The fatigue resistance of display products depends on the production process. The anti-fatigue performance of the module made by the poor three-proof treatment process is difficult to guarantee. When the temperature and humidity change, the protective surface of the circuit board will be cracked, resulting in a decrease in the protective performance.
Therefore, the production process is also a key factor in determining the life of the display. The production processes involved in the production of display screens include: component storage and pretreatment process, over-furnace welding process, three-proof process, and waterproof sealing process. The effectiveness of the process is related to material selection and ratio, parameter control and quality of the operator. 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. Work environment impact
The operating conditions of the display vary widely depending on the application. From the environmental point of view, the indoor temperature difference is small, no rain, snow and ultraviolet light; the outdoor temperature difference can reach up to 70 degrees, plus wind and sun and rain. A harsh environment can exacerbate the aging of the display, which is an important factor affecting the life of the display.
Mailme
Chat Now