Your right, even white light emits IR. It emits UV too. Wavelengths of the visible and not-so-visible spectrum are kinda my thing.
I'm just sayin' use and implementation of IR on the front of a car should be considered carefully, due to the possible, however unlikely, legalities. Same is true for the display.
Converting fog lights to IR emitters would hide them well, cus to the camera they'd probably look like bright fog lights. Building an IR LED array 2' long and mounting it behind the grille might just raise an eyebrow.
Had a chance to browse that Microvision site, and saw their HUD capabilities. Now I am very seriously considering that LCD idea I mentioned a few posts back. It might even work...the image would be magnified and skewed correctly so the text would look flat (i think). Maybe use something like this:
Then one of you nice folks can write me PIC programs (since I know jack), and I'd be totally SET!