LED rental screen has been more and more widely used, good display screen screen exquisite, colorful. However, in practice, after a short period of half a year or a rainy season, the beautiful screen will not reappear at first, such as color distortion, dead lights, large flower screen, etc. professional technicians know that this must be due to equipment failure or corrosion, resulting in poor touch.
In the field of advertising, LED electronic screen is a relatively valuable electronic goods, often hundreds of thousands, some even tens of millions. So, how to ensure the service life of such an infinite investment equipment, and whether it can adhere to good display effect and low failure rate in the service life period, has become a topic that manufacturers and investors attach great importance to. From the technical point of view, this paper analyzes the factors affecting the life of the display screen, and discusses the methods to ensure the long life of the LED electronic screen.
1. The factors that affect the life of LED electronic screen
The factors that affect the life of LED electronic screen are classified according to internal and external factors. The internal factors include the function of LED lighting equipment, the function of peripheral components, the anti fatigue function of commodities; the external factors include the working environment of LED electronic screen.
1.1 influence of LED luminous equipment function
LED light-emitting equipment is the most important part of the display screen, and also the most related to the longevity. About LED, we attach importance to the following objectives: attenuation characteristics, water vapor permeability characteristics, anti ultraviolet function.
Brightness attenuation is an inherent characteristic of LED. As for a display screen with a planning life of 5 years, if the brightness attenuation of LED used is 50% in 5 years, it is necessary to reserve attenuation margin in planning, otherwise the display function will not be qualified after 5 years; the target stability of attenuation is also very important. If the attenuation exceeds 50% in 3 years, it means that the life of this screen will be over early.
The outdoor display screen is often corroded by the moisture in the air. When the LED light-emitting chip touches the water vapor, it will cause stress change or electrochemical reaction, resulting in the failure of the equipment. Under normal circumstances, the LED light-emitting chip is wrapped by epoxy resin and is not corroded. Some LED equipment with planning defects or data and technical defects has poor sealing function. Water vapor can easily enter the equipment through the gap between the pins or the contact surface between epoxy resin and the shell, causing the equipment to fail quickly. This is called “dead light” in the industry.
Under the ultraviolet radiation, the properties of LED colloid and bracket data will change, and then the equipment will crack, which will affect the life of LED. Therefore, UV resistance of outdoor LED is also one of the main goals.