In past shoots in a studio we have used a plasma. As is described in a thread further down by another poster, the color temp of the plasma can be not so good. Also the plasma is expensive to rent.
Since we have a decent lcd projector, what would happen if we used a rear projection screen instead, roughly the size of a 50" plasma (except 4:3)? Will the refresh rate and or white balance mess with the cameras?
As Matte says, most of the projectors available, Broadcast included, run at a colour temperature of around 9K wheras your studio lights will be around 3.2K. Adding a half or full orange filter will balance the light but you'll lose some light in the process.