LED high-beam module design for automotive headlight

Abstract

In this paper, a laser-assisted light-emitting diode (LED) car high-beam headlight for modern cars is proposed. The headlight employs the LED light as the main light source of the car high-beam headlights. Under certain circumstances, the auxiliary main light source of the laser light source is added. Laser light sources are widely used in the field of automotive lighting owing to their high energy efficiency, small size, and good directionality. However, in terms of its application in headlights, the laser itself has limitations, such as a narrow line width and instability. In addition, all laser high beams are afflicted by the problems of laser light sources, and their optical design complexity has increased significantly. Therefore, this study used the total internal reflection of the light cone to promote the uniform distribution of the LEDs. Moreover, the collimating lens is used for laser spot convergence, and the laser light source is positioned at the laser spot to coincide with the LED spot center. Finally, the aspheric lens is incorporated into the light distribution design of the headlight. This optical design ensures driving safety and leverages the advantages of a laser light source to enhance the vehicle high-beam lighting effect, while improving the optical system design and reducing its complexity.