55‐3: Holographic Grating to Improve the Efficiency of Windshield HUD

A Windshield Head‐Up Display (WHUD) using an embedded optical thin film to improve the system efficiency is presented. Most of today's WHUDs, including the most advanced devices, use the windshield as a simple half‐mirror, so that the main part of the optical flow is not reflected toward the eye‐box. Even with recent work, aiming to increase the optical efficiency of the Picture Generating Unit, or the set of mirrors or light‐guides, reflectance efficiency is not greater than 20%. Experiments performed on the first prototype using Transparent Holographic Optical Components show an optical efficiency of 85%. This result will open the way for a more compact green product device (with a huge reduction in power consumption).