The adverse effects of LED outdoor display running at high temperature
With the use of LED display today, the use of LED displays is becoming more and more extensive. In order to play the advantages of the display to a greater extent, users should have a certain understanding of the maintenance of the LED display. Whether it is indoor LED display or outdoor LED display, heat will generate heat during operation, and the heat generated will cause the temperature of the LED display to increase. But do you know how high temperature operation has on the LED outdoor display?
1. LED display screen failure
The working temperature of the LED display exceeds the load temperature of the chip, which will quickly reduce the lighting efficiency of the LED electronic screen, produce significant light atmosphere and cause damage. The LED display is mainly made of transparent epoxy resin. For the packaging, if the knot temperature exceeds the solid phase transition temperature (usually 125 ° C), the packaging material will be transformed into rubber -shaped and the thermal expansion coefficient will rise sharply, which will lead to LED The display is on the way. Excessive temperature will affect the light decay of the LED outdoor display, and then shorten its service life. Take you to understand LED chips: technology, application and development.
2. Light attenuation accelerate
The life of the LED outdoor display is reflected through its light attenuation, that is, the brightness will become lower and lower over time until it goes out. High temperature is the main factors of LED display light attenuation, and will shorten the life of the LED display. The light attenuation of the LED electronic screen of different brands is different. Usually, the Shenzhen LED display manufacturer will give a set of standard light attenuation curves. The attenuation of the optical flux attenuation of the LED outdoor display caused by high temperature is irreversible. The light flux before the irreversible light attenuation of the LED display is called the “initial light flux” of the LED electronic screen. How to choose: top LED brand VS emerging brand.
3. Decreased lighting efficiency
Relieving temperature will reduce the lighting efficiency of the LED outdoor electronic display, which is mainly reflected in the following aspects:
A, changes in the concentration of electronics and holes
Rise temperature, increased concentration of electronics and holes, decreased band gaps, and decreased electron migration rates, which will affect the luminous efficiency of LEDs.
b, reduced radiation composite
The temperature is rising, and the electrons in the potential trap will reduce the possibility of the radiation composite of the acupoint, which will lead to non -radiation composite (heating), thereby reducing the internal quantum efficiency of the LED electronic screen.
c, the emission wavelength change
The elevated temperature causes the blue peak of the chip to move in the direction of the long wave, so that the wavelength of the chip’s launch is not matched with the fluorescent powder mixing the wavelength, which will also cause the external light extraction efficiency of white LED electrons to reduce efficiency.
D, reduced fluorescent powder quantum efficiency
As the temperature rises, the quantum efficiency of fluorescent powder decreases, the light emotion volume decreases, and the external light extraction efficiency of the LED electronic display screen is reduced.
E, silicone performance is affected
The performance of silicone is more affected by the ambient temperature. As the temperature rises, the thermal stress inside the silicone has increased, resulting in a decrease in the refractive index of the silicone, which affects the light efficiency of the LED electronic display.
In summary, the impact of continuous high temperature on the LED outdoor display is many aspects, which will not only cause the display screen failure, but also accelerate the decay of light, reduce the lighting efficiency, and ultimately affect the normal life and use of the display. Therefore, users should pay attention to the heat dissipation problem of the LED outdoor display, and take effective heat dissipation measures, such as installing air conditioning or axis flow fans to ensure that the display runs stably at a suitable temperature and give full play to its display effect.
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