Special for Very Short Focal lenght - projector
An example can be seen on this video from Microsoft at CeBIT this: See HERE 
 
 

              NEW  TYPE OF SCREEN:  LAMINATED  LG.7
 
 
DAF Screens has started laminating flexible PVC-film on Polycarbonate and Glass.
This screen has a peakgain of 0,7 and a ½-gain-value of ±45°. See gain-chart below.
 
The properties makes this screen VERY suitable for:
   1.   SOFT-EDGE BLENDING and with very good uniformity.
   2.   SHORT-THROW-PROJECTORS and ULTRA-short-throw.