I use an ipad for this purpose with the OnSong app as Zero Zero mentioned. In OnSong, there is a function called "autoscroll". This means you can set up the app to scroll forward to advance as you sing and play. You zoom in and make the type as big as you need and cover 3-4 pages if you have to.

Also, if you like, you can add a foot pedal to change pages. I think Zero Zero mentions this also. It works with the ipad as well.

I haven't tried this yet, but OnSong also has a feature to load backing tracks (as I build in BIAB) which can be set to play per each chart.