The invention relates to a screen (1) which can be wound onto and unwound from a screen roller using a maximum of N rotations, in which flexible thickenings (3) with a thickness d are guided in screen guides during the winding and unwinding movement, in which creasing of the screen (1) and folding over of the thickenings (3) during winding and unwinding is prevented:
- by screen roller end pieces (4) provided with a narrowing (5) with a drop (6), having a drop width b and drop height h, in which the partial drop width bl, in which the drop height is 75% of h, is at least 5 mm and at most $\frac{35}{0,18N+0,7d}$ and with diameters which decrease with respect to the diameter ø of the screen roller,
- and by tensioning the screen (1) in the unwinding direction by using a tensioning system.