High temperatures can have a damaging effect on LCD displays
(1) LCD display is usually packed with silica gel. If the junction temperature exceeds the solid-phase transition temperature (typically 125 ° C), the encapsulated material will become rubbery and accelerate thermal expansion very rapidly, resulting in open circuit and failure of the LCD display screen.
(2) when the OPERATING temperature of the LCD display exceeds the maximum load temperature of the chip, the luminous rate decreases rapidly, resulting in optical decay, and optical decay reflects the life of the LCD display, that is to say, we usually say that when used for a long time, the brightness of the LCD screen will be lower and lower.
Temperature affects the luminescence of LCD display screen
(1) With the increase of temperature, the concentration of electrons and holes increases, the band gap width decreases, and the electron mobility decreases.
(2) High temperature will make the blue wave peak of the chip shift to the long wave direction, so that the wavelength of the chip does not match that of the phosphor, so that the efficiency of extracting external light from the LCD screen is reduced.
(3) With the increase of temperature, the quantum efficiency of phosphor decreases, the light output decreases, and the LCD light output decreases, which eventually leads to the brightness of LCD screen decreases.
(4) The morphology of silica gel is greatly affected by temperature. As the temperature increases, the internal heat of silica gel increases, and the refractive index of silica gel decreases, resulting in the reduction of the optical efficiency of LCD.
To sum up, it can be concluded that a reasonable and appropriate temperature is the focus of LCD display, as long as the user can operate in accordance with the specification can be used normally.