A control unit for generating a control signal comprises a base part, a control element rotatable about an axis of rotation relative to the base part, a position encoder for detecting an angular position or a change in angular position of the control element relative to the base part, a control device which is adapted generate the control signal in dependence on the detected angular position or change in angular position of the control element and an electronic display device, wherein the control device is adapted to control the electronic display device to show at least one symbol arrangement. The control unit is characterized in that the electronic display device has the shape of a cylinder or of a cylinder sector whose axis coincides with the axis of rotation of the control element or extends in parallel thereto.