Measurement points for display on a two-dimensional pixel-based display device are formed by scanned and digitized measurement values. To this end, the resolution of each measurement point according to time and/or value is higher than the resolution of the two-dimensional pixel-based display device. The measurement points are connected into a continuous measurement point curve if they are not located on directly adjoining pixels. In order to determine the pixels to be depicted of the continuous measurement point curve between two measurement points not located on directly adjoining pixels, the positions of the adjoining measurement points within the associated pixels are taken into consideration.