The biggest display hurdle to be overcome revolves around
the required optical chain, a issue CRF have taken steps to
resolve. "The OEDIBUS display chain is very small, and the
whole system occupies less than 0.5 litres," continues
Repetto.
"We use holographic technology to couple the light
into and out of the HUD combiner. Light propagates through
the material of the combiner and a set of holographic
diffraction gratings is used to relay the image from a
state-of-the-art microdisplay to the driver’s eye."
"This HUD concept is a real breakthrough. It's a
completely new way of making HUDs. It's very comfortable for
drivers, too; there are only limited restrictions on their
viewing position.
"And because it produces a virtual image,
drivers don't have to change their focus when they look at
the display panel mounted on top of the instrument cluster,"
concludes Repetto, who expects this new system to become
available on production models from 2008 onwards.