Fundamentals and Applications have to understand the LED display
LED display Fundamentals
Light emitting diode (LED) is a photoelectric element including a III-V compound semiconductor material, its core is the PN junction. The forward voltage, electrons injected from the N area P area, hole injection from the P region N region, part of the minority carriers into each other's region and majority carrier recombination to emit light. PN junction is formed of material properties (band gap) determines the wavelength of light emitted, for visible light, which determines the color of the light.
The main features of the LED display are: small size, low power consumption, long life, high brightness low heat, environmental protection and durable. Under proper current and voltage, LED life of up to 100,000 hours.
LED classification and application
Depending on the type of light emitted, LED can be divided into visible and invisible LED LED two kinds.
LED visible light including red, orange, yellow, green, blue, violet LED. Wherein the red LED material GaP (binary), AlGaAs (ternary system) and AlGaInP (quaternary) based; blue / white LED GaN-based material.
Zhengzhou LED is widely used, including:
1, LED display: indoor and outdoor billboards, sports scoreboard, displays and other information;
2, the signal light: the major, in the city of the city's traffic lights, highways, railways and airports lights, electronic equipment function indication;
3, color lighting: outdoor landscape lighting and interior lighting;
4, special general lighting: portable lighting (flashlights, headlamps), illumination lighting (gallery lights, number plate lights, court lights), reading lights (plane, train, car reading light), light microscope, camera flash, lamp , street lamps;
5, security lighting: lamp, explosion-proof lights, emergency lights, security indicator lights;
6, the backlight: LCD monitors, LCD TV backlight.
7, vehicle lights: Includes interior lighting and exterior lighting, including the car dashboard, Denso product indicator (switches, audio, etc.), switch the backlight, reading light and external brake lights, tail lights, side lights and head lights.