A high-quality-easy-to-fabricate display element and a process for production thereof. A cylindrical base material is rotably supported horizontally on a rotating support device and in rotation, a coating solution is supplied to a coating surface, and a coating film is coated on the surface of the cylindrical base material. The carrier housing includes at least one connection flange by which the fastening flanges are directly in a fluid-guiding connection, with the connection flange being further connected to an exhaust guidance such that exhaust flows from the internal combustion engine through the first and second connection flanges and directly to the carrier housing.