A head-up display (HUD) for automobile or motorcycle use. By using a vacuum fluorscent display and through the double refraction effected by a special lens, the desired instant information values such the speed, time, etc. are enlarged and projected and then accurately displayed on the windshield of...http://www.google.com.au/patents/US4988976?utm_source=gb-gplus-sharePatent US4988976 - Head-up display with magnetic field speed detecting means
