To get your 1 prim 3 panel screen:
Rez a cube. Make it 35% hollow. Path Cut begin=0.275 end=1.0
Size it to x=1, y=0.01, z=0.5
Voila. Three approximately equal panels out of one prim. You can adjust to your liking.
An alternative configuration:
Rez a cube. Path cut begin=0.375 end=0.875
Set Y shear to 0.5
Size it to x=1, y=1, z=0.01
You can get 4 panels with a variation of this (making it hollow), but it'll be an irregular shape.