In the mid-1980s, LEDs began to be used in automotive central high-mount brake lights (CHMSL). In the 1990s, LEDs, a new solid-state light source, were generally used for backlighting of automotive instrument LCD panels. After entering the new century, with the improvement of LED power and brightness, in addition to automotive headlights, LEDs have fully entered the application of automotive lighting and signal systems. In 2005, the global LED market share in mobile phones reached 52%. Since 2005, as the mobile phone market has become saturated and no longer showing a growth trend, it has been replaced by the automobile, traffic lights, landscape decorative lighting and general lighting markets, of which the automotive LED market has greater temptation.

The development history of traditional car lights and their classification The development history of traditional cars

In 1879, Edison invented the vacuum incandescent light bulb that used electric energy as energy source. At the beginning of the automobile in 1886, the old cars were hung with erratic steam lights when they drove at night. Since there were very few vehicles at that time, the speed was very low (less than 30km/h), although the road was narrow and rugged, there was no danger of injury or collision.

With the gradual increase in vehicles and the increase in speed, the number of pedestrians on the road is also increasing, and cars are no longer allowed to sway leisurely only by a steam lamp. So the light source engineer designed a pair of bright incandescent eyes for the car relying on the emerging incandescent lamp. At that time, the electrical engineers of the automobile had equipped the automobile with a small generator, which laid the foundation for the development of automobile electrical lighting. With the increasing number of vehicles and the increasing speed of vehicles, it is no longer enough to look ahead with lighting. It is also necessary to look around and avoid worries. From then on, not only the front lights, but also various tail lights such as driving lights, brake lights, turn signals, and rear fog A series of lights, such as lights, came out one after another, which played a key role in avoiding rear-end collisions or collisions when turning at night. Later, headlamps developed into low beam, high beam, and front fog lamps.

In order to improve the filament temperature and luminous efficiency without reducing the life of the incandescent lamp, light source engineers invented the gas-filled incandescent bulb in the 1950s, and then in the 1960s invented the halogen tungsten lamp that added halogen to the gas-filled incandescent lamp. In the 1970s, tungsten halogen lamps with a luminous efficiency of 201m/W replaced self-incandescent lamps for automotive lighting on a large scale, and they are still the dominant lamp in automotive headlights. In order to meet the lighting requirements of high-speed vehicles, more advanced high-intensity discharge (HID) lamps have emerged, and the representative light source is a metal halide lamp. A 35W argon metal halide lamp radiation flux (3200lm) is a 55W tungsten halogen lamp

(1101lm) 3 times, the luminous efficiency is 4.5 times higher than that of the metal halide lamp, and the life span is more than 10 times.

Classification of car lights

Car lights are divided into two categories: illuminating lights and signal lights according to their purpose. Lights are like the "eyes" of a car, illuminating the road in the direction of the car in the dark, extending and broadening the driver's field of vision; signal lights are like the "mouth" of a car, and the vehicle can communicate with other vehicles by "language" through light signals , To clearly indicate the existence of the vehicle and its driving state to other car drivers, so that the car can drive safely and quickly on the road.

The lighting is divided into exterior lighting and interior lighting. Exterior lights include headlights, front fog lights, license plate lights, etc.; interior lights mainly refer to instrument lights and reading lights.

Signal-signal lights are also divided into exterior signal lights and interior signal lights. Signal lights outside the car refer to turn indicators, brake lights, tail lights, width indicators, reversing lights, etc.; signal lights inside the car refer to dashboard indicators, mainly including steering, oil pressure, charging, door closing prompts, audio, air conditioning, etc. Indicator light. Among these vehicle lights, there are exterior lights and exterior signal lights that belong to the controlled inspection, because they are key components for driving safety.

The front lamps of the car are shown in Figure 1. The headlights, like human eyes, play a finishing touch and add a lot of color to the car.

Among vehicle lamps, usually people also call the rear turn signal, brake lamp, tail lamp, rear fog lamp, reversing lamp and trunk lamp as auxiliary lamps.