Roller blind with differential light transmission

The roller blind (23) for the windows (4,16) of a motor vehicle has a rotatably mounted winding shaft with the roller blind web (22) attached to it by one edge. The light penetrability of the roller blind web is variable in such a way that with the blind stretched in front of the window the light penetrability in the region of the upper edge is less than in the region of the lower edge of the window. A drive is provided for the winding shaft for the winding up of the roller blind web.