Windshield with Diff ractive Optical Elements to Realize AR HUD

摘要

While HUD (head up display) windshield is more and more widely equipped on different kinds of vehicles, people have updated their desire on a new generation of HUD product, generally in following directions: 1. Larger HUD area 2. Wider visible angle 3. AR HUD As the key issue for HUD is ghost image, caused by surface reflection on face 1 and face 4 of laminated glazing. Current dominant solution is to use a wedge PVB, leading to coincidence between the main image and the ghost image at center angle, as shown in figure 1.