"a colour LCD pannel witch requires 32 bit controller interface"

Just because it has a 32-bit interface doesn't necessarily mean that you have to use a 32-bit processor!
After all, the 8086/88/286 were all just 16-bit processors, but still managed at least a 20-bit address bus.

The Triscend E5 has a 32-bit external address bus, and they have reference designs & dev kits for colour graphics LCDs.

Have a look at http://www.triscend.com/