source:Industry Trends release time:2024-01-04 Hits: Popular:led screen wholesaler
What are the effects of high temperature operation on LED electronic screens? With the increasing application of LED electronic screens, in order to maximize the efficiency of display screen usage, application companies should have basic knowledge of LED electronic screen maintenance. Whether it is indoor LED electronic screens or outdoor LED electronic screens, LED display screens generate heat during operation, which can lead to an increase in the temperature of LED electronic screens. But what are the effects of the display screen working at high temperatures, do you know? Below, LED display screen manufacturers will analyze and analyze together with everyone.
Usually, indoor LED electronic screens generate less heat due to low brightness and can naturally dissipate heat; However, outdoor LED electronic screens generate a large amount of heat due to their high brightness, which requires cooling through air conditioning or axial fans. Due to the fact that LED electronic screens are electronic products, an increase in temperature can affect the light decay of LED electronic screen beads, affect the efficiency of driving ICs, and prolong the lifespan of LED electronic screens.
1、 LED electronic screen open circuit and failure: If the operating temperature of the LED electronic screen exceeds the chip's carrying temperature, the luminous efficiency of the LED electronic screen will quickly decrease, resulting in obvious light attenuation and damage; LED electronic screens are often packaged with transparent epoxy resin. If the junction temperature exceeds the solid-phase transition temperature (usually 125 ℃), the packaging material will transform into a rubber like shape and the coefficient of thermal expansion will suddenly increase, leading to open circuit and failure of LED electronic screens. Excessive temperature can affect the light attenuation of LED electronic screens
The lifespan of LED electronic screens is manifested by their light decay, which means that over time, the brightness decreases until it goes out. The lifespan of an LED electronic screen is typically defined as the time it takes for the luminous flux to decay by 30. High temperature is the main root cause of LED display screen attenuation and shortened lifespan of LED electronic screens. The light attenuation of LED electronic screens of different brands varies, and usually LED electronic screen manufacturers will provide a set of standard light attenuation curves. The attenuation of luminous flux caused by high temperature in LED electronic screens is irreversible. The initial luminous flux of LED electronic screens is called the luminous flux before the irreversible attenuation of the LED display screen.
2、 An increase in temperature will reduce the luminous efficiency of LED electronic screens: as the temperature increases, the concentration of electrons and holes will increase, the bandgap width will decrease, and the electron mobility will decrease; As the temperature increases, the probability of radiative recombination between electrons and holes in the potential well decreases, causing non radiative recombination (generating heat), thereby reducing the internal quantum efficiency of LED electronic screens; The increase in temperature causes the blue light peak of the chip to shift towards the long wavelength direction, resulting in a mismatch between the emission wavelength of the chip and the excitation wavelength of the fluorescent powder, and also causing a decrease in the external light extraction efficiency of the white LED electronic screen; As the temperature increases, the quantum efficiency of the fluorescent powder decreases, the light output decreases, and the external light extraction efficiency of the LED electronic screen decreases; The performance of silicone is greatly affected by environmental temperature. As the temperature increases, the thermal stress inside the silicone increases, leading to a decrease in the refractive index of the silicone, thereby affecting the light efficiency of LED electronic screens.
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