What is the effect of high temperature operation on full-color LED display


What are the effects of high temperature operation on full-color LED displays? Today, display screens are used more and more widely. In order to maximize display efficiency, application companies need to have basic knowledge of LED display maintenance. Whether indoors or out. When the LED display is still outdoors, the display will generate heat, which may cause the temperature of the LED display to rise.

But do you know how the LED display will be affected by high temperature? The following articles will be analyzed together with you. Generally speaking, the indoor LED display has low brightness, less heat, and naturally releases heat. But outdoors.

LED displays have high brightness and generate a lot of heat, which needs to be cooled by air conditioners or axial fans. The LED display is an electronic product, so the temperature rise will affect the light drop of the LED lamp bead, the light driving the lamp bead will reduce the productivity of the IC, and the life of the LED display. First, the LED display is turned on and effective: If the display is turned on and it is effective: the working temperature of the LED exceeds the load-bearing temperature of the chip, the luminous efficiency of the LED display will drop rapidly, and there will be a significant drop in light, which may cause damage.

If the junction temperature of the LED exceeds the solid-phase transition temperature (usually 125) C), the packaging material will become rubber, and the thermal expansion coefficient will rise sharply, causing the LED display to open and fail. Second, the rise in temperature will reduce the luminous efficiency of the LED screen. As the temperature increases, the concentration of electrons and holes increases, the exclusion zone decreases, and the electron mobility decreases.

As the temperature increases, the rate of radiative recombination of electrons and holes in potential traps decreases, resulting in non-radiative recombination (generating heat) and reducing the internal quantum efficiency of the LED display. When the temperature rises, the blue light peak of the chip shifts to the long-wave direction, causing the emission wavelength of the chip to be inconsistent with the stimulation wavelength of the phosphor, and the light extraction efficiency outside the white LED display is reduced. As the temperature increases, the quantum efficiency of the phosphor decreases, the luminous rate decreases, and the extraction efficiency of the external lighting of the LED display decreases.

The performance of silicon is greatly affected by the ambient temperature. As the temperature rises, the thermal stress inside the silicon increases, and the refractive index of the silicon decreases, which affects the light efficiency of the LED display. .

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