Rollo assembly and open roof construction provided therewith

A rollo assembly for the open roof construction of a vehicle is provided, comprising a rotatable winding shaft (5) and a flexible sun screen (6) having forward and rearward ends. The rearward end of the sun screen can be wound on or off the winding shaft and the forward end of the sun screen is provided with an operating beam (7). The winding shaft is received in a housing (8) that comprises an opening (9) for the passage of the sun screen with a length at least substantially corresponding with a transversal width of the sun screen. The operating beam at its side facing towards the housing carries a sealing member (10) extending above the sun screen transversally over a length at least substantially corresponding with the length of the opening in the housing, for engaging the housing when the sun screen is maximally wound onto the winding shaft.