Holographic automotive display with full color properties

Abstract

A head-up display for cars, which can display full color stereoscopic images, is developed. The display employs a reflective holographic screen having a size of 24(horizontal) x 18(vertical) for image projection. The screen is made by laminating two holographic directional diffusers recorded on Du Pont HRF-706 holographic photopolymer, which are tuned to blue (480nm) and green-red (507-630nm) spectral regions. It shows both properties of a concave spherical mirror and a diffuser. The screen's eye box size in horizontal direction is about 20cm and stereo images can be perceived within 50cm to Im distance from the screen. No visible color distortions owing to the screen's uniform spectral response and high transparency allow that well distinction between images on the screen and images from outside of the screen even under the sun illumination.