　　 LED display has great development prospects due to its advantages of energy saving, environmental protection and long life. But the temperature is very important to the LED display, the effect of temperature on the LED display: LED display related to life and luminous efficiency, color and the like. So the right temperature is critical to the LED display .
The effect of temperature on the LED display has the following three points:
First, the temperature is too high will lead to the complete destruction of the LED display
(1) The operating temperature of the LED display exceeds the carrying temperature of the chip, which will cause the luminous efficiency of the LED display to decrease rapidly, causing obvious light decay and causing damage ;
(2) The LED display is mostly encapsulated in transparent epoxy resin. If the junction temperature exceeds the solid phase transition temperature ( usually 125 °C) , the package material will change to rubber and the thermal expansion coefficient will rise sharply, resulting in open and invalid LED display. .
Second, the effect of temperature on the LED display emission wavelength (light color)
　　 The wavelength of the LED display can generally be divided into a peak wavelength and a dominant wavelength. The peak wavelength is the wavelength at which the light intensity is the largest, and the dominant wavelength is determined by the X and Y chromaticity coordinates, reflecting the color perceived by the human eye. Obviously, the change in the wavelength of the LED display caused by the junction temperature will directly cause the human eye to feel differently about the color of the LED display . For an LED display device, the forbidden band width of the luminescent material directly determines the wavelength or color of the device's illumination. As the temperature rises, the forbidden band width of the material will decrease, resulting in a longer wavelength of the device and a red shift in color.
Third, the temperature rise will reduce the luminous efficiency of the LED display
The reasons why temperature affects the LED display efficiency include the following:
(1) As the temperature rises, the concentration of electrons and holes increases, the band gap decreases, and the electron mobility decreases.
(2) When the temperature rises, the probability of recombination of electrons and holes in the potential well is reduced, resulting in non-radiative recombination ( heat generation ) , thereby reducing the internal quantum efficiency of the LED display .
(3) The temperature rise causes the blue light peak of the chip to shift toward the long wave direction, so that the emission wavelength of the chip and the excitation wavelength of the phosphor do not match, which also causes the external light extraction efficiency of the white LED display to be lowered.
(4) As the temperature rises, the quantum efficiency of the phosphor decreases, the light emission decreases, and the external light extraction efficiency of the LED display panel decreases.
(5) The performance of silica gel is greatly affected by the ambient temperature. As the temperature rises, the thermal stress inside the silica gel increases, causing the refractive index of the silica gel to decrease, thereby affecting the light effect of the LED display .
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