Abstract: A method of and an input device for measuring scroll or click movement of an object and the input device relative to each other, includes determining the presence of the object on a window of the input device. Lower frequencies of an output signal from single sensor unit are separated and used for determining both the scroll and click motions. This allows measuring scroll movement and click movement with one sensor unit of the input device and reduction of costs and size of the input device.

Abstract: The invention relates to an apparatus (1) for and a method of applying a substance (16), such as a solution containing an electroluminescent (EL) material or a suspension containing silver particles, to a substrate (7). The apparatus comprises a substrate carrier (5), a nozzle head (12) comprising at least one nozzle (12A) for ejecting the substance (16), and means (2,3,4) for moving the substrate carrier (5) and the nozzle head (12) with respect to each other. It further comprises a first imaging device (13) fixed relative to the nozzle head (12), a second imaging device (9), and one or more references (8) fixed relative to and positioned within the image field of the second imaging device (9). The mechanical link between the substrate (7) and the nozzle head (12) is thus substantially circumvented and inaccuracies originating from this link are avoided.