Rollo Assembly

A rollo assembly comprises a flexible rollo screen, a rotatable winding shaft to which a first end of the rollo screen is attached for being wound on or off said winding shaft and two opposite longitudinal guides extending in a longitudinal direction perpendicularly to the winding shaft for guiding opposite sides of the rollo screen. The rollo screen further is provided with longitudinally spaced elongate stiffeners extending substantially in a transverse direction in parallel to the winding shaft between the opposite sides of the rollo screen and attached to the flexible rollo screen, which stiffeners are biased for assuming a curved shape in said transverse direction. Each stiffener comprises two stiffener parts which comprise facing edges and wherein each stiffener further comprises a hinge member extending in said transverse direction and joining said facing edges.