Large touchscreens

Hello all.

I am designing a touchscreen project. What do you think the largest screen a Mega2560p would run?
I have played about with 2.4" and 3.2" screens.
The largest I have found is a 7" touchscreen, which apparently will work fine (400x800 resolution).

Anyone tried anything larger? Would it even be possible, so would there either be an issue with finding a library for it.

My only other option I suppose would be a Raspberry Pi, but I would rather use an Arduino if I can.

Any advice gratefully received!

Steve

What are you trying to "run" on them? Are you looking for a video driver of some sort?

The 7" touch screen like the ones from 4D Systems or Nextion seems to be the largest advertising Arduino compatibility.