The structure of moderm auto led bulb is becoming more and more complicated, at the same time the function is being improved gradually. The development of auto led bulb has experienced four stages.
The first generation of automotive light source is fuels. These fuels burn to emit lights. Fuels can only satisfy the requirement of early stageauto led bulb due to its low luminous efficiency, weak light intensity, unstable performance, complex operation and etc. shortcomings. .HID has replaced incandescent lamp and halogen tungsten lamp to become a new choice for automotive light source.
The second generation of automotive light source is incandescent lamp. Incandescent lamp was invented by Edison in 1879. In the year 1913, Americans for the first time apply incandescent lamp in Cadillac cars to act as headlamps. From then on, automobile lamps have undergone a series of revolutionary reformations and theauto led bulb has entered the electric age. It was not until the year 1925 that the automobiles adopted incandescent lamps widely. In 1950s, halogen tungsten lamp was invented and quickly become the dominating light bulb for automotive strong light source. Following that, new technologies like reflector, starter, generator and storage battery were invented successively. The third generation of automotive light source is HID (high intensity discharge). Be provided with advantages of high luminous efficiency, high brightness and high reliability, In auto led bulb, the electric energy is switched into light energy directly
Now comes the fourth generation of automotive light source ---auto led bulb , the auto led bulb is a kind of semiconductor products with PN junctions. When a positive bias was imposed on the two ends of the PN junctions, the PN junction system was activated, and the carriers will shift from low state of energy into high state of energy. On this condition, unstable carriers in high state of energy will return to low state, thus generates superfluous energy which will be released in the form of photons, according to the conservation of energy principle. That isauto led bulb illumination principle. Unlike earlier stages light sources, auto led bulb doesn’t shine light because of temperature rising caused by heat energy. The wavelength of the light irradiated by auto led bulb is decided by the carriers’ energy difference between low state and high stateIt is widely used as accessorial illuminating lamps, backlight of instrument panel and so on in particular.. The application of auto led bulb in inner automobile light source is becoming wider.
The development of auto led bulb source is in direct association with the development of LED products. Only when auto led bulb technologies make advancements can car led bulb be more widely used as automotive headlamps. In the near future, with the improvement of auto led bulb quality and the reducing of prices, auto led bulb products will bring on a new revolution in the illumination domain, which will further influence the transformation of auto led bulb, The five basic components for auto led bulbs are: LED array, reflector, lens, radiator, and driving circuit.