DMD-based intelligent light distribution technology of LED headlamp

With the rapid development of autonomous driving technology, the driving environment is becoming more and more complex, and higher requirements are put forward for car headlights. This paper proposes a smart headlamp with LED as the light source, Digital Mirror Device (DMD) as the core light distribution element, and free-form surface lens as the optical imaging element. The LED collimating outer lens is calculated by the theory of light refraction and reflection, and modeling and simulation are performed on it. Its optical efficiency meets the design requirements and achieves good light collection and collimation for the LED. According to the relevant specifications of the national standard and the structural characteristics of the DMD micromirror array. Using the principle of area segmentation to design standard patterns that meet national standards and DMD intelligent patterns in multiple traffic scenes; use theoretical calculations to obtain free-form surface imaging lenses. The processed LED light is modulated by DMD to form a specific intelligent pattern, and a free-form surface lens is used to achieve imaging and light distribution. The simulation analysis results show that the optical modulation performance of the system is good, and the optical efficiency meets the design requirements. A prototype of the intelligent light distribution system was built, and compared with the lighting effect after loading the standard pattern, its lighting index reached the national standard requirements, and the intelligent light distribution experiment under multiple intelligent scenes was completed. The system can flexibly load different lighting patterns to achieve clarity. Light projection.