What is the principle of LED screen
Author:Cao Xiangyang Time:2021-06-07 15:47 Browse(490)
Led principle
Led principleLight emitting diode (LED) is a kind of light source made of semiconductor technology, which is developed from three or five group (III-V) compound semiconductors after the development of silicon semiconductor technology in 1950sThe light-emitting principle of LED is to use the combination of electrons and holes in the semiconductor to emit photons.

What is the principle of LED screen

unlike bulbs, which need to operate at a high temperature of more than 3000 degrees, and fluorescent lamps do not need to use high voltage to excite electron beams, LEDs are the same as ordinary electronic components, which only need 2-4 volts (V) voltage to operate normally at room temperature, so their life is longer than that of traditional light sources.
in this paper, the light-emitting principle of LED is introducedThe color of LED is mainly determined by the energy released by the combination of electron and hole, which is determined by the energy gap of the semiconductor materials used.
the wavelength of the same material is very close.
therefore, the light color of each LED is pure. Compared with traditional light sources, LED is a digital light source. the commonly used size is about 0.3-1 mm, which is much smaller than the traditional bulb or fluorescent lamp.
for the convenience of use.
LED is usually packaged with resin, which is made into various shapes of about 5 mm, which is very strong and shock resistant.
in this paper, the design of LED chip is introducedThe manufacturing process of LED is very similar to that of silicon wafer IC.
firstly, the ultra-high purity group III elements (al, GA, in) in the chemical periodic table and group V elements (n, P, as) in the chemical periodic table are used as materials to react at high temperature to form compounds, which are grown by single crystal technology,The single crystal rod is cut, ground and polished into a wafer, which is used as a substrate, and then the light-emitting material is grown on the substrate by using epitaxial technology. The epitaxial wafer is finely cut and processed into led through the process of semiconductor gold plating and etching.
LED screen is a new type of imaging electronic equipment made of light-emitting diodes arranged in order.
this paper introduces the development of LED screenApplication of monochromatic LEDAt first, led was used as the indicator light source of instruments and meters.
later, led with various light colors was widely used in traffic lights and large area displays, resulting in good economic and social benefits.
take 12 inch red traffic lights as an example.
in the United States, 140 watt incandescent lamps with long life and low light efficiency were originally used as the light source, It produces 2000 lumens of white light.
after passing through the red filter.
the light loss is 90%, leaving only 200 lumens of red light.
in the new design of the lamp.
Lumileds company uses 18 red LED light sources, including circuit loss, which consumes 14 watts of power, and can produce the same light efficiency.
in the new design of the lamp, Lumileds company uses 18 red LED light sourcesAutomobile signal lamp is also an important field of LED light source application.
in 1987, China began to install high mounted stop lamp on automobiles. Due to the fast response speed (nanosecond level) of LED, it can let the driver of the following vehicle know the driving condition as soon as possible, and reduce the occurrence of rear end collision accidents.
in this paper, the development trend of high mounted stop lamp is introducedIn addition,
LED lights have been used in outdoor red, green and blue full-color displays, keychain mini torches and other fields.
in addition, LED lights have been widely used in outdoor red, green and blue full-color displays, keychain mini torches and other fields
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