What is the characteristic description of the unidirectional diodes of the light -emitting diode? LED can only be turned on (power -on) in one direction, called positive bias (positive bias). When the current flows, the electrons and the cave are compounded in their inside The wavelength and color of the light are related to the types of semiconductor materials it adopted.

High efficiency, long life, not easy to break, high switching speed, high reliability and other traditional light sources cannot be. The luminous efficiency of Baiguang LED has been significantly improved in recent years. At the same time, in terms of purchasing prices per thousand, it has also declined significantly because of the influence of the market's competition.

Although more and more people use LED lighting office, furniture, decoration, signatures, and even street lights, technically, LED is still lower than the new type of fluorescent lamp in the photoelectric conversion efficiency (the ratio of valid illumination). The country will develop the whereabouts of civilian use in the future.

Compared with the incandescent bulb and the lamps, the characteristics of the light -emitting diode are: the working voltage is very low (some are only a few volts); the working current is small (some can light up at zero pm); Well, high reliability, and long life; the strength and weakness of the passing of the passing can easily modulate the strength of glowing.

Due to these characteristics, the light emitting diode is used as a light source in some optoelectronic control devices and is used as a signal display in many electronic devices. Make its heart into strips, and use 7 semiconductor tubes to form a 7 -stage semiconductor digital tube. Each digital tube can display 0-9,10 Arabic numerals and A, B, C, D, E, E, E, E, E , F and other letters (must be distinguished and lowercase).