A method of determining new luminance value data based on original luminance value data to be displayed on a matrix display device, where the luminance value data are coded in sub-fields, the sub-fields including a group of most significant sub-fields and a group of least significant sub-fields, wherein a common value for the least significant sub-fields is determined for a set of lines. In the method, a number of sub-fields values are compensated for motion artefacts and at least one of the sub-fields in two or more lines is addressed simultaneously.