MEMS Laser Scanners in Automotive HUD
Today’s automotive HUDs are based on several different principles such as liquid crystal display-thin film transistor (LCD-TFT) technology and use LEDs as the light source but a MEMS-based HUD is very different, effectively being a laser scanning image projector. In contrast to existing systems, these use three laser diodes that emit red, green and blue light, and each is fitted with a lens to provide a beam with a very low numerical aperture. The light from these is then combined with dichroic optical elements into a single white light beam.
