Has been tested by Heighway I believe, 46 inch display as playfield cover. I believe Andrew said that the technology is not for now. But maybe in the future the are going to use it.

Here is a quote from an article concerning Heighway Pinball:

'Deluxe models, due later this year, will have a 46" transparent screen that resides over the playfield surface and below the top glass. With images and video appearing and disappearing during play, the transparent screen will reportedly provide truly immersive experience. But core gameplay remains true to tradition with plenty of ramps and drop targets. The digital technology, Heighway explained, is intended to enhance traditional play, not replace. - See more at: http://vendingtimes.com/ME2/dirmod.asp?sid=EB79A487112B48A296B38C81345C8C7F&nm=Vending+Features&type=Publishing&mod=Publications%3A%3AArticle&mid=8F3A7027421841978F18BE895F87F791&tier=4&id=D7587242D4C24F48A59309F15CD7DBB0#sthash.MQF20Wjv.dpuf