Present car-headlamps can adapt their light distribution to the traffic situation only in a predefined way. The next
generation of headlamps will offer a more flexible adaptation of their light distribution like an adaptive Cut-Off-Line in
"Advanced Frontlighting Systems" (AFS). Addressable light sources in future active headlamps enable functions like
glare free high beam or marking light. There are several possibilities to design such an addressable light source.
In this contribution one solution using a digital micro mirror device (DMD) is presented. With this device an adaptive
light distribution can be generated by modulating every pixel of the DMD individually. For the design of an optical
system for a DMD headlamp a DMD-Projector was analyzed. The procedure of generating a light distribution can be
divided into two processes: a.) illumination of DMD b.) projecting the image of the DMD on the street. In a DMD
projector the illumination of a DMD is a very complex optical system with many optical elements. Some of these optical
elements are not necessary for a car headlamp because of different requirements for car headlamps and DMD projectors.
The illumination system can be simplified if these elements are eliminated. Also the aspect ratio of the imaging system
for the DMD has to change 4:3 (DMD) to 7:2 (light distribution on the street).