At night driving safety, lighting technology is the focus, whether it is the warning effect of the rear lights or the illumination of the front field of view, it plays a key role in night driving. With the popularity of LED backlights, the projects that the international automakers are vying for have become the illumination system for headlights.
At the turn of the century, HID gas discharge headlamps became dominant. Different from the principle that the traditional halogen lamp emits light with high resistance filament under the passing of current, the HID head lamp applies a voltage of more than 20,000 volts to the helium gas with a high voltage plate to generate an arc, so that the gas molecules enter the excited state, and then The excited state returns to the steady state of the process of illuminating, producing the effect of illumination, and its color temperature is very close to daylight, providing a good color reproduction effect, which helps the driver to distinguish the actual road conditions. HID, which is several times the amount of light emitted by conventional halogen lamps, requires only half of the power consumption of halogen lamps, and has become a popular cause. However, the HID lamp group requires a high-cost high-voltage boosting and voltage stabilizing circuit, and the cost of replacing the bulb group is also high, which is an obstacle to its promotion.
At night driving safety, lighting technology is the focus, whether it is the warning effect of the rear lights or the illumination of the front field of view, it plays a key role in night driving.
When entering the 21st century, with the advancement of optoelectronic technology, LED lighting technology has become a new manifestation. The lighting technology of LED lighting was actually invented in 1962, using the combination of electrons and holes in the diode to illuminate the emitted light. At the earliest development, only red light was developed. With the development of materials technology, green light and blue light were gradually added, and then white light LED light-emitting components were developed. With the successful development of high-power LED components, LED headlights were composed of automobiles. The latest manifestation of lighting. As far as the research of the automobile company is concerned, the service life of the HID headlight bulb is about 3,000 hours, and the service life of the LED headlight group is further increased to 30,000 hours. Under the same illumination intensity, the power consumption of the LED headlight is even only HID. 1/5 of the headlight group. In addition, the structure of the LED light group is lighter and thinner, and has a higher degree of freedom in design, allowing it to quickly replace the HID headlights, becoming the new favorite of the new generation of headlight technology. The Lexus LS 600h is the first car to feature a full LED headlight.
When entering the 21st century, with the advancement of optoelectronic technology, LED lighting technology has become a new manifestation.
In 2011, BMW once again pushed headlight technology forward. This time, BMW used laser light as the illumination source for the headlights. Broadly speaking, the laser headlight is also a kind of LED headlight, except that the LED light-emitting module emits laser light of uniform wavelength, and then laser light is directed to the lens filled with yellow phosphorus to excite high-brightness white light. It is adjusted by the reflecting surface and projected in front. According to BMW, the luminous efficiency of the laser headlights is 70% higher than that of the LED headlights, and the illumination range can reach 600 meters, which is more than twice that of the traditional LED headlights. It is more energy efficient and has a greater benefit for long-distance driving at night. . The compact size of the laser light group also allows for a larger design leap in the shape of the vehicle.
In 2011, BMW once again pushed headlight technology forward. This time, BMW used laser light as the illumination source for the headlights.
Regarding the first use of the laser headlights, there is actually an interesting episode. BMW started research and development in 2011 and introduced the design at the 2013 Frankfurt Motor Show. It announced that it will start supplying laser headlights in the summer of 2014. However, Audi first used the laser headlights on the R18 racing car of the 2014 Le Mans competition, making it the first car to actually install a laser headlight. In addition to the i8 equipped with technology, the BMW 7 Series and the Audi R8 are also equipped with laser headlights.
The BMW 7 Series (below) and the Audi R8 (above) are also equipped with laser headlights.
Compared to competitors vying for the historical position of laser headlights, Mercedes-Benz, another German car manufacturer, has a different view. Mercedes-Benz believes that the strength of laser headlights is used in high beam lights. Such ultra-long-distance lighting technology is extremely cool, but it can only be used in high beam lights. There are not many opportunities for application and the practical value is not high. . Therefore, in the design of the headlight group, Mercedes-Benz adopts matrix LED technology and uses up to 24 LED light-emitting diodes to construct a complex headlight group, which can be equipped with Intelligent Drive's strict detection technology. It is necessary to adjust the light shape of the headlights, including the illumination to the range of vehicles, pedestrians, etc., which can be partially adjusted to meet the safety requirements of driving and other passers-by. Mercedes-Benz announced that its headlamp group in the next generation is expected to be upgraded to 80 LEDs, and its high beam illumination distance can reach 600 meters, laser headlights no longer have an advantage.
In the design of the headlight group, Mercedes-Benz adopts matrix LED technology and uses up to 24 LED light-emitting diodes to construct a complex headlight group.
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