Have a read of the link below a very common problem on Scenic II's, If your car has full Renault Service history I would give
Renault Customer Services
a call as they have being known to pick up the tab or make a contribution to repairs even if outside the warranty, always worth a call.
Renault - Scenic II - Digital Display Flickering*Fixed*
Also use the Forums search facility input Scenic dash and it should throw up further info for you