because of its energy-saving, environmental protection, long life and other advantages are very promising, but the temperature of the LED display is very important, directly related to the life of LED display and light efficiency, color, etc., so the appropriate temperature on the LED display is crucial.
The effect of temperature on LED display has the following five points:
High temperature will lead to the complete destruction of LED display
(1) LED display work temperature exceeding the chip's load temperature will make LED display's luminous efficiency quickly reduce, produce obvious light decay, and cause damage;
(2) LED display more transparent epoxy encapsulation, if the junction temperature exceeds the solid phase transition temperature (usually 125 ℃), packaging materials will change to rubber-shaped and thermal expansion coefficient, resulting in LED display open and failure.
Second, the temperature increase will shorten the life of LED display The life of the LED display is its light decay, that is, the time is long, the brightness is getting lower, until finally extinguished.
Usually defines the LED display luminous flux attenuation 30 of the time for its life.
LED display is usually caused by the light failure of the following reasons: (1) LED display chip material defects in the high temperature will quickly multiply, multiply, until the invasion of light-emitting zone, the formation of a large number of non radiation complex center, seriously reduce the light-emitting efficiency of LED display.
In addition, in the high temperature, the micro-defects in the material and the rapid expansion of impurities from the interface and the electrical plate will also be introduced into the light-emitting zone, forming a large number of deep energy levels, the same will accelerate the LED display device light decay.
(2) at high temperature, the transparent epoxy resin will be denatured, yellow, affecting its transmittance, the higher the temperature of the process will be carried out faster, this is the LED display light failure is another major reason.
(3) The light decay of phosphor is also a major cause of the light decay of LED display, because the decay of phosphor at high temperature is very serious.
Therefore, the high temperature is caused by LED display light decay, shorten the LED display life of the main source. Different brands LED display light decay is different, usually led display manufacturers will give a set of standard optical decay curve.
High temperature LED display luminous flux attenuation is not recoverable, LED display does not occur irreversible light attenuation before the luminous flux, called LED display "initial luminous flux."
Third, temperature increase will reduce the luminous efficiency of LED display
The factors that affect the light efficiency of the LED display include the following:
(1) When the temperature increases, the radiation recombination probability of electrons and holes in the potential well decreases, causing the radiation compound (producing heat), thus reducing the internal quantum efficiency of the LED display.
(2) temperature increase led to the chip's blue wave to the direction of the long wavelength shift, so that the chip emission wavelength and phosphor excitation wavelength mismatch, will also result in white LED display external light extraction efficiency of the reduction.
(3) As the temperature increases, the quantum efficiency of the phosphor decreases, the light decreases, and the external light extraction efficiency of the LED display screen decreases.
The effect of temperature on the luminous wavelength (light color) of LED display screen
The luminous wavelength of LED display can be divided into peak wavelength and main wavelength. Peak wavelength is the maximum wavelength of light intensity, while the main wavelength can be determined by x and y chromaticity coordinates, reflecting the color perceived by the human eye. Obviously, the temperature caused by the LED display screen light-emitting wavelength changes will directly cause the human eye on the LED display color of the different feelings. For an LED display device, the bandgap width value of the light-emitting zone material directly determines the wavelength or color of the device's luminescence.
When the temperature increases, the bandgap width of the material will be reduced, resulting in a longer light wavelength and a red shift in color.
V. High temperature will limit the maximum injection current of LED display As the temperature increases, the concentration of electrons and cavities will increase, the bandgap width will decrease, and the electron migration rate will decrease.
FINE PIXEL LED display lamp beads are used in a special process, improve the lamp bead temperature resistance, UV resistance, stress resistance, enhance the reliability of LED chip, color temperature uniformity, so that led display light decay smaller, to ensure that screen without flower screen, color block, blind point, color, the whole screen out of control rate is less than one out of 10,000. The above is the temperature of the impact of the introduction of LED display, through the above introduction that the temperature rise of the impact of the LED display is very large.
So the appropriate temperature is the focus of the LED display.
FINE PIXEL LED display unit has good temperature control ability, has better performance in environmental applicability, at the same time has high brightness of 1200cd/m2, and brightness can be adjusted in 0~1200cd/m2 range; The above features enable the display to adapt to any indoor brightness environment, whether in the daytime or night, sunny or cloudy, also in the relatively closed control room, meeting rooms, or bright light exhibition venues, lobbies, etc., LED display can be high brightness and progressive adjustable, to adapt to a variety of brightness environment, to bring the most comfortable impression of the audience experience.
Extreme light and space saving
Small PIXEL Pitch LED display
using cast aluminum cabinet, high-strength, Single box ultra-thin, exquisite beauty, light weight, convenient installation and handling, and greatly reduce the space occupied by the display screen.
5000 meters above sea level, helping the construction of national West Our country is vast, the terrain West is high East low, altitude difference is very big. In order to support the western construction of the country, FINE PIXEL led specially focused on the natural conditions of low atmospheric pressure and low temperature in the Western high altitude area, and the working current, working voltage, breaking ability and protection characteristics of low-voltage electrical appliances were studied in high altitude area,
The micro-spacing LED display work elevation to 5000 meters, the basic can be in any existing urban environment normal work.
Stronger high temperature and humid environment tolerance
The use of an integrated aluminum oxide casting box, lamp beads using silicone compression molding technology to improve product temperature resistance, UV resistance, stress resistance.
A variety of installation methods to adapt to any site Micro-spacing LED display supports a variety of installation methods, can be landed, can be hoisted, mosaic, can be hung wall, FINE PIXEL LED can be installed in accordance with the space, shape and decoration design of the situation for the user to design the best installation program, so that the display and the surrounding decoration to achieve a perfect reunification