What Is The Effect Of Temperature On An LED Large Screen?

LED Large Screen displays are becoming increasingly popular. To enhance display efficiency, application firms must fundamentally understand LED display maintenance. Heat will create during operation, whether an indoor or outdoor LED display, which may cause the temperature of the LED display to rise. But do you know what happens to the display when it operates at high temperatures?

In general, the brightness of an indoor LED display panel is modest, so there is less heat, and it naturally emits heat.

The LED display screen is open and effective: if the working temperature of the LED display screen exceeds the load-bearing temperature of the chip, the luminous efficiency of the LED display screen will be rapidly reduced, there will be an apparent light recession, and damage may occur. The LED display screen is packaged with transparent epoxy resin. If the bonding temperature exceeds the solid phase transition temperature (usually 125 ℃), the packaging material will be transformed into rubber, and the coefficient of thermal expansion will rise sharply, resulting in the opening and failure of the LED display screen.

Too high a temperature will affect the light recession of the LED screen, and the life of the LED display screen will suffer from light recession. In other words, if the time is extended, the brightness will gradually decrease until it is turned off. Generally, the life of an LED display screen is defined as the attenuation of light speed for 30 hours.

Various LED display brands cause a decrease in luminance. In general, LED display manufacturers supply the typical light decrease curve. High temperature causes irreversible light speed reduction in LED displays. Before unrecoverable light attenuation, LED displays had no light speed (referred to as the “initial light speed” of LED displays). The luminous efficiency of an LED panel will be reduced as the temperature rises. The density of electrons and holes increases as temperature rises, the band gap narrows, and electron mobility falls. The spontaneous emission rate of both holes and electrons in the potential well drops as temperature rises, resulting in a non-radiative combination (heat production), which degrades the internal quantum efficiency of the LED touchscreen display.

The illuminating efficiency of an LED panel will be reduced as the temperature increases. The density of holes and electrons increases as temperature rises, the band gap narrows, and electron mobility falls. The radiative recombination rate of electrons and holes in the prospective well drops as temperature rises, resulting in non-radiative recombination (heat production), which degrades the internal quantum effectiveness of the LED display screen. When the temperature rises, the chip’s blue light peak changes to the acoustic wave direction, leading to an incompatibility between the chip’s wavelength range and the phosphor’s excitation frequency, and the light removal rate outside the white LED touchscreen display falls.

Final Words
The ambient temperature has a great impact on the performance of digital signage applications. The operating conditions of outdoor LED displays should not exceed 70℃, but the optimal temperature for indoor LED displays is 23℃. Therefore, it is necessary to control the working environment of LED screens strictly.