In the PN junction of some semiconductor materials, the injected minority carriers, when combined with most carriers, release the excess energy in the form of light, thus converting electrical energy directly into energy. PN Junction Plus reverse voltage, a few carriers are difficult to inject, it does not glow. The diode, which is made of the injection electroluminescent principle, is called a light-emitting diode, commonly known as an LED.
LED display if you want to display images, you need to make up the pixel of each led luminous brightness must be able to adjust, its fine degree is the display of gray level. The higher the gray level, the more exquisite the image, the richer the color, the more complex the corresponding display control system. In the current technical level, the 256-level gray image, the color transition has been very soft, image restoration is more satisfactory.
LED light source because of its energy-saving, environmental protection, long life, security, fast response, small size, rich color, controllable series of unique advantages, is considered to be the best way to reduce energy consumption.
Light-emitting Diode (light Emitting Diode) is widely found in daily life, such as the indicator lamp of household appliances, car rear fog lights and so on. The most notable feature of LED is long service life and high photoelectric conversion efficiency.