China's LED display market after several years of development, is now very mature. It is reported that China's market share in the LED display accounted for about eighty percent of the world, the market is very large, the world's major LED display manufacturers are also concentrated in China, especially the eastern seaboard is particularly concentrated.

Previously, China's LED display market is followed by foreign countries, due to immature technology, production capacity is relatively backward as well as insufficient innovation, many products are imitation, resulting in the product is not very competitive. Over the years, the state strongly support the development of high-tech industries, especially emerging industries of strategic significance, support for greater strength, LED industry is one of the beneficiaries. Under the strong support of the state and local governments, China's LED display industry is thriving, and many internationally renowned LED display companies have emerged, of which LCF is one.

 In the increasingly widespread application of LED display today, in order to maximize the benefits of display use, application companies should have the basic common sense of LED display maintenance. Whether it is indoor LED display or outdoor LED display, in the process of operation will produce heat, the heat generated will lead to led display temperature rise. But what is the impact of the display in the high temperature of the working condition, do you know? The following LCF editor will analyze and analyze it with you.

Usually, indoor LED display due to low brightness produces less heat, can be natural heat dissipation; but outdoor LED display due to high brightness, produces a large amount of heat, need to be through the air conditioning or axial fan and other ways to dissipate heat. As the LED display belongs to electronic products, the rise in temperature will affect the LED display lamp beads of light failure, affect the driver IC efficiency, LED display life and so on.

First, led display working temperature exceeds the chip carrying temperature will make led display luminous efficiency quickly reduce, produce obvious light failure, and cause damage; led display more transparent epoxy resin package, if the junction temperature exceeds the solid phase transition temperature (usually 125 ° C), encapsulation material will be to the rubbery transformation and the coefficient of thermal expansion rise, which leads to led display open circuit and failure.

Second, the high temperature will affect the light decay of led display. led display life is manifested in its light decay, that is, time is long, the brightness is getting lower and lower, until finally extinguished. Usually defined led display luminous flux attenuation 30 time for its life. High temperature is the main root cause of led display light decay, shorten led display life. Different brands of led display light decay is different, usually led display manufacturers will give a set of standard light decay curve. High temperature led display luminous flux attenuation is irrecoverable, led display does not occur before the irrecoverable light attenuation of the luminous flux, known as led display “initial luminous flux”.

Third, the rising temperature will reduce the luminous efficiency of led display. Elevated temperature, the concentration of electrons and holes will increase, the forbidden band width will be reduced, the electron mobility will be reduced; Elevated temperature, the potential well of electrons and holes in the radiation composite probability decreases, resulting in non-radiation composite (heat generation), thus reducing the quantum efficiency of the led display screen; Elevated temperature leads to the chip's blue wave peak to the direction of long-wave shift, so that the chip's emission wavelengths and the excitation wavelengths of the phosphor does not match, will also cause the white led display light-emitting efficiency. Will also cause a reduction in the white led display external light extraction efficiency; as the temperature rises, the phosphor quantum efficiency decreases, the output light decreases, the external light extraction efficiency of the led display decreases; silicone performance is greatly affected by the ambient temperature. As the temperature rises, the thermal stress within the silica gel increases, resulting in a decrease in the refractive index of the silica gel, thus affecting the led display light effect.

Fourth, the temperature on the led display light-emitting wavelength (light color) impact. led display light-emitting wavelength can generally be divided into the peak wavelength and the main wavelength. Peak wavelength that is the wavelength of the greatest light intensity, and the main wavelength can be determined by the X, Y chromaticity coordinates, reflecting the color perceived by the human eye. Obviously, the junction temperature caused by the led display wavelength of light-emitting wavelength changes will directly cause the human eye on the led display light-emitting color of different feelings. For a led display device, the forbidden bandwidth value of the light-emitting area material directly determines the wavelength or color of the device light-emitting. Temperature increases, the forbidden band width of the material will decrease, resulting in the device light emitting wavelength becomes longer, the color of the red shift.

Fifth, high temperature will limit the maximum injection current of led display. In the purchase of LED display, pay attention to the choice of LED display chip brand, packaging manufacturers, driver IC brand, switching power supply brand, brand good or bad will affect the quality of the LED display's own product quality, and the brand degree of high products, its own heat generated by less, but also better control of the temperature of the LED display, so as to extend the service life of the LED display.

LED display is very promising because of its energy saving, environmental protection, long life and other advantages.LED display is more sensitive to temperature: it will affect the LED display life, light effect, color, etc. So the right temperature is very important for the LED display. So the right temperature is crucial for LED display.