Doing a bit of research, it seems possible to use partial infill with DLP, at least that's what we see in pictures here:
http://forums.reprap.org/read.php?1,...359#msg-340359
jon@kudo3d was also posting in this thread.

Slic3er.org say they are supporting DLP as well but there is not much details, seems there is an option to export the layers to pictures rather than gcode, i need to check this , i use slic3r for my FDM printer, like it.

I definitely see the need to print larger parts with a partial infill to save on resin costs and weight. And it's probably not a big issue to slice it in a way for the uncured resin to be able to escape for most of the layers.